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Title:
Steel Frame Beam-Reinforcing Metal Fixture
Kind Code:
A1
Abstract:
The present invention provides a steel frame beam-reinforcing metal fixture that is capable of recovering the full strength of a steel frame beam to a greater extent than a conventional steel frame beam-reinforcing metal fixture for an S structure. A steel frame beam-reinforcing metal fixture is substantially fitted to a web opening in an SRC beam. An outer peripheral portion of the steel frame beam-reinforcing metal fixture is fillet-welded to a steel frame beam web. The axial length of the steel frame beam-reinforcing metal fixture is between 0.5 and 200.0 times the thickness thereof in the radial direction. Furthermore, in the steel frame beam-reinforcing metal fixture, a length from one end side of the steel frame beam web to one end of the outer peripheral portion and a length from the other end side of the steel frame beam web to the other end of the outer peripheral portion are each at least 0.7 times the thickness of the steel frame beam web.


Inventors:
Matsuo, Hideshige (Tokyo, JP)
Kitano, Takashi (Tokyo, JP)
Nakano, Kenzo (Tokyo, JP)
Ohba, Syuji (Tokyo, JP)
Application Number:
11/629072
Publication Date:
02/28/2008
Filing Date:
08/17/2004
Assignee:
Hitachi Metals Techno, Ltd. (4-2, Toyo 2-chome, Koto-ku, Tokyo, JP)
Primary Class:
International Classes:
E04C3/04
View Patent Images:
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Attorney, Agent or Firm:
BIRCH STEWART KOLASCH & BIRCH (PO BOX 747, FALLS CHURCH, VA, 22040-0747, US)
Claims:
1. A steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an outer peripheral portion is fillet-welded to said steel frame beam web, an axial length is between 0.5 and 200.0 times a thickness in a radial direction, and a length from one end side of said steel frame beam web to one end of said outer peripheral portion and a length from another end side of said steel frame beam web to another end of said outer peripheral portion are each at least 0.7 times a thickness of said steel frame beam web.

2. A steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an outer peripheral portion is butt-welded to said steel frame beam web, an axial length is between 0.5 and 200.0 times a thickness in a radial direction, a length from one end side of said steel frame beam web to another end of said outer peripheral portion is greater than a thickness of said steel frame beam web, and a joint surface of said outer peripheral portion, which is joined to said steel frame beam web, includes a curved surface (0≦radius of curvature≦five times said thickness of said steel frame beam web).

3. A steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an outer peripheral portion is butt-welded to said steel frame beam web, an axial length is between0.5 and200.0 times a thickness in a radial direction, a length from one end side of said steel frame beam web to another end of said outer peripheral portion is greater than a thickness of said steel frame beam web, and a joint surface of said outer peripheral portion, which is joined to said steel frame beam web, includes a first joint surface (0≦length≦said thickness of said steel frame beam web) which is substantially parallel to said radial direction, and a second joint surface which is inclined at an angle θ (15≦θ≦80) from said axial direction.

4. A steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length is between 0.5 and 200.0 times a thickness in a radial direction, an indirect member fillet-welded to said steel frame beam web is fillet-welded to an outer peripheral portion, and a length from one end side of said steel frame beam web to one end of said indirect member and a length from another end side of said steel frame beam web to another end of said indirect member are each at least 0.7 times a thickness of said steel frame beam web.

5. A steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length is between 0.5 and 200.0 times a thickness in a radial direction, an indirect member butt-welded to said steel frame beam web is fillet-welded to an outer peripheral portion, a length from one end side of said steel frame beam web to another end of said indirect member is greater than a thickness of said steel frame beam web, and a joint surface of said indirect member, which is joined to said steel frame beam web, includes a curved surface (0≦radius of curvature≦five times said thickness of said steel frame beam web).

6. A steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length is between 0.5 and 200.0 times a thickness in a radial direction, an indirect member butt-welded to said steel frame beam web is fillet-welded to an outer peripheral portion, a length from one end side of said steel frame beam web to another end of said indirect member is greater than a thickness of said steel frame beam web, and a joint surface of said indirect member, which is joined to said steel frame beam web, includes a first joint surface (0≦length≦said thickness of said steel frame beam web) which is substantially parallel to said radial direction, and a second joint surface which is inclined at an angle θ (15≦θ≦80) from said axial direction.

7. A pair of steel frame beam-reinforcing metal fixtures comprising a first steel frame beam-reinforcing metal fixture and a second steel frame beam-reinforcing metal fixture, which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length of said first steel frame beam-reinforcing metal fixture and said second steel frame beam-reinforcing metal fixture is between 0.5 and 200.0 times a thickness in a radial direction, an indirect member fillet-welded to said steel frame beam web is fillet-welded to one end of said first steel frame beam-reinforcing metal fixture and another end of said second steel frame beam-reinforcing metal fixture, and a length from one end side of said steel frame beam web to one end of said indirect member and a length from another end side of said steel frame beam web to another end of said indirect member are each at least 0.7 times a thickness of said steel frame beam web.

8. A pair of steel frame beam-reinforcing metal fixtures comprising a first steel frame beam-reinforcing metal fixture and a second steel frame beam-reinforcing metal fixture, which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length of said first steel frame beam-reinforcing metal fixture and said second steel frame beam-reinforcing metal fixture is between 0.5 and 200.0 times a thickness in a radial direction, an indirect member butt-welded to said steel frame beam web is fillet-welded to one end of said first steel frame beam-reinforcing metal fixture and another end of said second steel frame beam-reinforcing metal fixture, a length from one end side of said steel frame beam web to another end of said indirect member is greater than a thickness of said steel frame beam web, and a joint surface of said indirect member, which is joined to said steel frame beam web, includes a curved surface (0≦radius of curvature≦five times said thickness of said steel frame beam web).

9. A pair of steel frame beam-reinforcing metal fixtures comprising a first steel frame beam-reinforcing metal fixture and a second steel frame beam-reinforcing metal fixture, which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length of said first steel frame beam-reinforcing metal fixture and said second steel frame beam-reinforcing metal fixture is between 0.5 and 200.0 times a thickness in a radial direction, an indirect member butt-welded to said steel frame beam web is fillet-welded to one end of said first steel frame beam-reinforcing metal fixture and another end of said second steel frame beam-reinforcing metal fixture, a length from one end side of said steel frame beam web to another end of said indirect member is greater than a thickness of said steel frame beam web, and a joint surface of said indirect member, which is joined to said steel frame beam web, includes a first joint surface (0≦length≦said thickness of said steel frame beam web) which is substantially parallel to said radial direction, and a second joint surface which is inclined at an angle θ (15≦θ≦80) from said axial direction.

Description:

TECHNICAL FIELD

The present invention relates to a steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening provided in a steel frame beam web of a steel frame beam in an S structure (steel structure) or an SRC structure (steel framed reinforced concrete structure) to reinforce the steel frame beam in the S structure and SRC structure.

BACKGROUND ART

A web opening is provided in a steel frame beam web of a steel frame beam in an S structure or an SRC structure in a building so that a pipe, a wire, or the like can be passed through the interior of the web opening, and conventionally, an S structure steel frame beam-reinforcing metal fixture such as the following is provided to reinforce an S structure steel frame beam provided with a web opening. The S structure steel frame beam-reinforcing metal fixture takes a ring shape, and an outer peripheral portion thereof is welded to a peripheral edge portion of the web opening formed in the S structure steel frame beam. The axial length of the reinforcing metal fixture is between 0.5 and 10.0 times its thickness in the radial direction. According to this reinforcing metal fixture, a pipe can be inserted into the web opening provided in the steel frame beam of the S structure with an improved degree of freedom, and a web opening can be formed in a plasticized region of the steel frame beam in the vicinity of a column-beam joint portion (see Japanese Unexamined Patent Application Publication 2003-232105).

DISCLOSURE OF THE INVENTION

This conventional S structure steel frame beam-reinforcing metal fixture is welded by fillet welding or butt welding. However, in the former case, the two axial end portions of the outer peripheral portion of the S structure steel frame beam-reinforcing metal fixture are merely welded to the peripheral edge portion of the web opening from the front side and rear side around the entire periphery thereof (paragraphs [0028], [0029], FIG. 1, and so on of Japanese Unexamined Patent Application Publication 2003-232105), while in the latter case, the axial length of a flange portion of the S structure steel frame beam-reinforcing metal fixture, which is welded by butt welding, is merely set at no more than half the axial length of the S structure steel frame beam-reinforcing metal fixture (paragraphs [0033], [0038], [0050], FIGS. 5, 6, and so on of Japanese Unexamined Patent Application Publication 2003-232105). Hence, in a conventional S structure steel frame beam-reinforcing metal fixture, there is room for improvement in the extent to which the full strength of the steel frame beam in the S structure can be recovered.

Moreover, an improvement in full strength recovery is required not only in a steel frame beam of an S structure, but also in a steel frame beam of an SRC structure.

It is therefore an object of the present invention to provide a steel frame beam-reinforcing metal fixture that is capable of recovering the full strength of a steel frame beam in an S structure or an SRC structure to a greater extent than a conventional S structure steel frame beam-reinforcing metal fixture.

According to the present invention, the object described above can be achieved by the following means.

A first invention is a steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an outer peripheral portion is fillet-welded to the steel frame beam web, an axial length is between 0.5 and 200.0 times a thickness in a radial direction, and a length from one end side of the steel frame beam web to one end of the outer peripheral portion and a length from another end side of the steel frame beam web to another end of the outer peripheral portion are each at least 0.7 times a thickness of the steel frame beam web.

A second invention is a steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an outer peripheral portion is butt-welded to the steel frame beam web, an axial length is between 0.5 and 200.0 times a thickness in a radial direction, a length from one end side of the steel frame beam web to another end of the outer peripheral portion is greater than a thickness of the steel frame beam web, and a joint surface of the outer peripheral portion, which is joined to the steel frame beam web, includes a curved surface (0≦radius of curvature≦five times the thickness of the steel frame beam web).

A third invention is a steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an outer peripheral portion is butt-welded to the steel frame beam web, an axial length is between 0.5 and 200.0 times a thickness in a radial direction, a length from one end side of the steel frame beam web to another end of the outer peripheral portion is greater than a thickness of the steel frame beam web, and a joint surface of the outer peripheral portion, which is joined to the steel frame beam web, includes a first joint surface (0≦length<the thickness of the steel frame beam web) which is substantially parallel to the radial direction, and a second joint surface which is inclined at an angle θ (15≦0≦80) from the axial direction.

A fourth invention is a steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length is between 0.5 and 200.0 times a thickness in a radial direction, an indirect member fillet-welded to the steel frame beam web is fillet-welded to an outer peripheral portion, and a length from one end side of the steel frame beam web to one end of the indirect member and a length from another end side of the steel frame beam web to another end of the indirect member are each at least 0.7 times a thickness of the steel frame beam web.

A fifth invention is a steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length is between 0.5 and 200.0 times a thickness in a radial direction, an indirect member butt-welded to the steel frame beam web is fillet-welded to an outer peripheral portion, a length from one end side of the steel frame beam web to another end of the indirect member is greater than a thickness of the steel frame beam web, and a joint surface of the indirect member, which is joined to the steel frame beam web, includes a curved surface (0≦radius of curvature≦five times the thickness of the steel frame beam web).

A sixth invention is a steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length is between 0.5 and 200.0 times a thickness in a radial direction, an indirect member butt-welded to the steel frame beam web is fillet-welded to an outer peripheral portion, a length from one end side of the steel frame beam web to another end of the indirect member is greater than a thickness of the steel frame beam web, and a joint surface of the indirect member, which is joined to the steel frame beam web, includes a first joint surface (0≦length<the thickness of the steel frame beam web) which is substantially parallel to the radial direction, and a second joint surface which is inclined at an angle θ (15≦θ≦80) from the axial direction.

A seventh invention is a pair of steel frame beam-reinforcing metal fixtures comprising a first steel frame beam-reinforcing metal fixture and a second steel frame beam-reinforcing metal fixture, which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length of the first steel frame beam-reinforcing metal fixture and the second steel frame beam-reinforcing metal fixture is between 0.5 and 200.0 times a thickness in a radial direction, an indirect member fillet-welded to the steel frame beam web is fillet-welded to one end of the first steel frame beam-reinforcing metal fixture and another end of the second steel frame beam-reinforcing metal fixture, and a length from one end side of the steel frame beam web to one end of the indirect member and a length from another end side of the steel frame beam web to another end of the indirect member are each at least 0.7 times a thickness of the steel frame beam web.

An eighth invention is a pair of steel frame beam-reinforcing metal fixtures comprising a first steel frame beam-reinforcing metal fixture and a second steel frame beam-reinforcing metal fixture, which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length of the first steel frame beam-reinforcing metal fixture and the second steel frame beam-reinforcing metal fixture is between 0.5 and 200.0 times a thickness in a radial direction, an indirect member butt-welded to the steel frame beam web is fillet-welded to one end of the first steel frame beam-reinforcing metal fixture and another end of the second steel frame beam-reinforcing metal fixture, a length from one end side of the steel frame beam web to another end of the indirect member is greater than a thickness of the steel frame beam web, and a joint surface of the indirect member, which is joined to the steel frame beam web, includes a curved surface (0≦radius of curvature≦five times the thickness of the steel frame beam web).

A ninth invention is a pair of steel frame beam-reinforcing metal fixtures comprising a first steel frame beam-reinforcing metal fixture and a second steel frame beam-reinforcing metal fixture, which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length of the first steel frame beam-reinforcing metal fixture and the second steel frame beam-reinforcing metal fixture is between 0.5 and 200.0 times a thickness in a radial direction, an indirect member butt-welded to the steel frame beam web is fillet-welded to one end of the first steel frame beam-reinforcing metal fixture and another end of the second steel frame beam-reinforcing metal fixture, a length from one end side of the steel frame beam web to another end of the indirect member is greater than a thickness of the steel frame beam web, and a joint surface of the indirect member, which is joined to the steel frame beam web, includes a first joint surface (0≦length<the thickness of the steel frame beam web) which is substantially parallel to the radial direction, and a second joint surface which is inclined at an angle θ (15≦θ≦80) from the axial direction.

According to the present invention, the strength of a welded portion formed by welding a steel frame beam-reinforcing metal fixture to a steel frame beam web can be set to be equal to or greater than the strength of a steel frame beam. Hence, according to the present invention, the full strength of the steel frame beam can be recovered. Moreover, according to the present invention, the full strength of a steel frame beam in an SRC structure, as well as a steel frame beam in an S structure, can be recovered.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view showing a first example of a part indicated by a broken line in FIG. 13;

FIG. 2 is a view showing a second example of a part indicated by a broken line in FIG. 13;

FIG. 3 is a view showing a third example of a part indicated by a broken line in FIG. 13;

FIG. 4 is a view showing a fourth example of a part indicated by a broken line in FIG. 13;

FIG. 5 is a view showing a fifth example of a part indicated by a broken line in FIG. 13;

FIG. 6 is a view showing a sixth example of apart indicated by a broken line in FIG. 13;

FIG. 7 is a view showing a seventh example of a part indicated by a broken line in FIG. 13;

FIG. 8 is a view showing an eighth example of a part indicated by a broken line in FIG. 13;

FIG. 9 is a view showing a ninth example of a part indicated by a broken line in FIG. 13;

FIG. 10 is a view showing a tenth example of a part indicated by a broken line in FIG. 13;

FIG. 11 is a view showing an eleventh example of a part indicated by a broken line in FIG. 13;

FIG. 12 is a view showing a twelfth example of a part indicated by a broken line in FIG. 13; and

FIG. 13 is a view showing an SRC beam reinforced by a steel frame beam-reinforcing metal fixture according to an embodiment of the present invention.

DESCRIPTION OF REFERENCE SYMBOLS

  • 1 SRC beam
  • 2 main reinforcement
  • 3 stirrup
  • 4 concrete
  • 5 steel frame beam
  • 5-1 steel frame beam web
  • 5-2 steel frame beam flange
  • 6 web opening
  • 7-1 steel frame beam-reinforcing metal fixture
  • 7-2 steel frame beam-reinforcing metal fixture
  • 7-3 steel frame beam-reinforcing metal fixture
  • 7-4 steel frame beam-reinforcing metal fixture
  • 7-5 steel frame beam-reinforcing metal fixture
  • 7-6 steel frame beam-reinforcing metal fixture
  • 7-7 steel frame beam-reinforcing metal fixture
  • 7-8 steel frame beam-reinforcing metal fixture
  • 7-9-1 first steel frame beam-reinforcing metal fixture
  • 7-9-2 second steel frame beam-reinforcing metal fixture
  • 7-10-1 first steel frame beam-reinforcing metal fixture
  • 7-10-2 second steel frame beam-reinforcing metal fixture
  • 7-11-1 first steel frame beam-reinforcing metal fixture
  • 7-11-2 second steel frame beam-reinforcing metal fixture
  • 7-12-1 first steel frame beam-reinforcing metal fixture
  • 7-12-2 second steel frame beam-reinforcing metal fixture
  • 8 part indicated by broken line in FIG. 13
  • 9 fillet welding
  • 10 butt welding
  • 12 groove bottom portion
  • 11-1 indirect member
  • 11-2 indirect member
  • 11-3 indirect member
  • 11-4 indirect member
  • ta axial length of steel frame beam-reinforcing metal fixture
  • tb thickness of steel frame beam-reinforcing metal fixture in radial direction
  • tw thickness of steel frame beam web
  • t1 length from one end side of steel frame beam web to one end of outer peripheral portion, length from other end side of steel frame beam web to other end of outer peripheral portion, length from one end side of steel frame beam web to one end of indirect member, length from other end side of steel frame beam web to other end of indirect member
  • t2 length from one end side of steel frame beam web to other end of outer peripheral portion, length from one end side of steel frame beam web to other end of indirect member
  • R radius of curvature of first joint surface on steel frame beam-reinforcing metal fixture, radius of curvature of first joint surface on indirect member
  • θ incline of second joint surface on steel frame beam-reinforcing metal fixture from axial direction, incline of second joint surface on indirect member from axial direction
  • L length of first joint surface on outer peripheral portion, length of first joint surface on indirect member

BEST MODE FOR CARRYING OUT THE INVENTION

A best mode for carrying out the present invention will be described in detail below with reference to the attached drawings.

FIG. 13 is a view showing an SRC beam 1 reinforced by a steel frame beam-reinforcing metal fixture according to an embodiment of the present invention.

As shown in FIG. 13, the SRC beam 1 comprises a main reinforcement 2, a stirrup 3, concrete 4, and a steel frame beam 5 made of steel. The steel frame beam 5 comprises a steel frame beam web 5-1 and a steel frame beam flange 5-2. A web opening 6 is provided in the SRC beam 1, and a steel frame beam-reinforcing metal fixture 7-1 according to an embodiment of the present invention is substantially fitted to the web opening 6. The steel frame beam-reinforcing metal fixture 7-1 is welded to the steel frame beam web 5-1. Note that the steel frame beam-reinforcing metal fixture 7-1 may be created from a member (made of cast steel, forged steel, or similar, for example) having a material strength that is equal to or greater than the material strength of the steel frame beam web 5-1.

FIG. 1 is an enlarged view of a part 8 indicated by a broken line in FIG. 13, and shows a first example of the part 8 indicated by the broken line in FIG. 13.

As shown in FIG. 1, in the first example an outer peripheral portion of the steel frame beam-reinforcing metal fixture 7-1 is fillet-welded 9 to the steel frame beam web 5-1.

Note that in this specification, the axial direction of the steel frame beam-reinforcing metal fixture 7-1 will be referred to simply as the “axial direction”, and the radial direction of the steel frame beam-reinforcing metal fixture 7-1 will be referred to simply as the “radial direction”. Further, an axial thickness tw of the steel frame beam web 5-1 denotes the length of the steel frame beam web 5-1 in the axial direction of the steel frame beam-reinforcing metal fixture 7-1.

Here, an axial length ta of the steel frame beam-reinforcing metal fixture 7-1 is between 0.5 and 200.0 times a thickness tb thereof in the radial direction. Furthermore, in the steel frame beam-reinforcing metal fixture 7-1, a length t1 from one end side of the steel frame beam web 5-1 to one end of the outer peripheral portion and a length t1 from the other end side of the steel frame beam web 5-1 to the other end of the outer peripheral portion are each at least 0.7 times the thickness tw of the steel frame beam web 5-1. Note that in the first example shown in FIG. 1, the length from one end side of the steel frame beam web 5-1 to one end of the outer peripheral portion and the length from the other end side of the steel frame beam web 5-1 to the other end of the outer peripheral portion are identical (both are set at t1), but this is simply for ease of description, and accordingly, the present invention is not limited to an aspect in which the length from one end side of the steel frame beam web 5-1 to one end of the outer peripheral portion and the length from the other end side of the steel frame beam web 5-1 to the other end of the outer peripheral portion are identical.

According to the steel frame beam-reinforcing metal fixture 7-1, the strength of the welded portion 9 is greater than the strength of the steel frame beam web 5-1, and therefore the full strength of the steel frame beam can be recovered. This will now be described using mathematical expressions.

The strength of the steel frame beam web is expressed by the following equation.
(strength of steel frame beam web)=tw×π×(length of web opening diameter)×(allowable stress) [Numeral 1]

The strength of the welded portion 9 is expressed by the following equation.
(maximum value of strength of welded portion 9)=2×t1/√2×π×(length of web opening diameter)×(allowable stress) [Numeral 2]

In the steel frame beam-reinforcing metal fixture 7-1 according to the first example, the length t1 from one end side of the steel frame beam web 5-1 to one end of the outer peripheral portion and the length t1 from the other end side of the steel frame beam web 5-1 to the other end of the outer peripheral portion are each at least 0.7 times the thickness tw of the steel frame beam web 5-1, and hence the following equation can be derived.
2×t1/√2×π×(length of web opening diameter)×(allowable stress)≧tw×π×(length of web opening diameter)×(allowable stress)
t1≧1/√2×tw≈0.7tw [Numeral 3]

Note that the constitution shown in FIG. 1 is an example of the part 8 indicated by the broken line in FIG. 13, and in the present invention, the part 8 indicated by the broken line in FIG. 13 may also be realized by the following constitutions shown in FIGS. 2 to 12, for example. The constitutions shown in FIGS. 2 to 12 will be described below in sequence.

FIG. 2 is a view showing a second example of the part 8 indicated by the broken line in FIG. 13.

As shown in FIG. 2, a steel frame beam-reinforcing metal fixture 7-2 according to the second example comprises an outer peripheral portion having a projecting portion a tone end side, and this projecting portion on one end side of the outer peripheral portion is fillet-welded 9 to the steel frame beam web 5-1 together with a plane on the other end side of the outer peripheral portion.

Here, the axial length ta of the steel frame beam-reinforcing metal fixture is between 0.5 and 200.0 times the thickness tb thereof in the radial direction at the other end side. Furthermore, in the steel frame beam-reinforcing metal fixture 7-2, the length t1 from one end side of the steel frame beam web 5-1 to one end of the outer peripheral portion and the length t1 from the other end side of the steel frame beam web 5-1 to the other end of the outer peripheral portion are each at least 0.7 times the thickness tw of the steel frame beam web 5-1. Note that in the second example shown in FIG. 2, the length from one end side of the steel frame beam web 5-1 to one end of the outer peripheral portion and the length from the other end side of the steel frame beam web 5-1 to the other end of the outer peripheral portion are identical (both are set at t1), but this is simply for ease of description, and accordingly, the present invention is not limited to an aspect in which the length from one end side of the steel frame beam web 5-1 to one end of the outer peripheral portion and the length from the other end side of the steel frame beam web 5-1 to the other end of the outer peripheral portion are identical.

Similarly to the first example, in the second example the strength of the welded portion 9 is greater than the strength of the steel frame beam web 5-1, and therefore the full strength of the steel frame beam can be recovered.

FIG. 3 is a view showing a third example of the part 8 indicated by the broken line in FIG. 13.

As shown in FIG. 3, a steel frame beam-reinforcing metal fixture 7-3 according to the third example comprises an outer peripheral portion having a projecting portion at one end side. The other end side of the outer peripheral portion is formed with a first joint surface (curved surface) having a radius of curvature R (0≦R≦five times the thickness tw of the steel frame beam web 5-1), and a second joint surface (inclined plane) formed as a continuation of the curved surface and inclined at an angle θ (15≦θ≦80) from the axial direction. The first joint surface and second joint surface are butt-welded 10 to the steel frame beam web 5-1.

Here, the axial length ta of the steel frame beam-reinforcing metal fixture 7-3 is between 0.5 and 200.0 times the thickness tb thereof in the radial direction at the other end side. Furthermore, in the steel frame beam-reinforcing metal fixture 7-3, a length t2 from one end side of the steel frame beam web to the other end of the outer peripheral portion is greater than the thickness tw of the steel frame beam web 5-1.

According to the third example, the entire joint surface of the steel frame beam web 5-1 is welded to the outer peripheral portion of the steel frame beam-reinforcing metal fixture 7-3, and therefore the full strength of the steel frame beam can be recovered.

Also according to the third example, a curved surface is provided on a groove bottom portion 12 of the steel frame beam-reinforcing metal fixture 7-3, and therefore weld metal lo can be welded to the groove bottom portion 12 easily. Hence, according to the third example, high quality welding can be performed easily at the groove bottom portion 12.

Also according to the third example, the second joint surface (inclined plane) is formed as a continuation of the first joint surface and inclined at the angle θ (15≦θ≦80) from the axial direction, and therefore slag or the like generated during welding can be discharged to the exterior of the groove, enabling easy and high quality welding.

Typically, when the volume of the weld metal 10 increases, multi-layer buildup welding must be performed, and as a result, slag remains in the weld metal, causing welding defects and the like which lead to an increase in the likelihood of flaws in the weld metal 10. In the third example, however, the radius of curvature R of the first joint surface (curved surface) on the steel frame beam-reinforcing metal fixture 7-3 is set at 0≦R≦(five times the thickness tw of the steel frame beam web 5-1), and the angle of incline of the second joint surface (inclined plane), which is a continuation of the first joint surface (curved surface), is set at the angle θ (15≦θ≦80) from the axial direction, and therefore the volume of the weld metal 10 does not increase unnecessarily. Hence, according to the third example, the likelihood of flaws in the weld metal 10 can be reduced. Note that in the third example, the second joint surface (inclined plane) is inclined at the angle θ (15≦θ≦80) from the axial direction, but when the angle θ is within a range of 30 to 70 degrees, the likelihood of flaws in the weld metal 10 can be reduced even further, and moreover, the required amount of weld metal lo can be reduced, enabling a reduction in cost.

In the third example, the first joint surface on the outer peripheral portion of the steel frame beam-reinforcing metal fixture 7-3 is a curved surface and the joint surface of the steel frame beam web 5-1 is a plane, but in the present invention, the first joint surface and second joint surface on the outer peripheral portion of the steel frame beam-reinforcing metal fixture 7-3 maybe formed as an integral plane and the joint surface of the steel frame beam web 5-1 may be formed as a curved surface. In this case, the steel frame beam web 5-1 may be provided with an inclined plane which is formed as a continuation of a curved surface provided on the joint surface and inclined at the angle θ (15≦θ≦80) from the axial direction.

Further, in the third example, the other end side of the outer peripheral portion of the steel frame beam-reinforcing metal fixture 7-3 is provided with the first joint surface (curved surface) having the radius of curvature R and the second joint surface (inclined plane) formed as a continuation of the curved surface and inclined at the angle θ (15≦θ≦80) from the axial direction, but in the present invention, an inclined plane such as the second joint surface may be omitted, and the other end side of the outer peripheral portion of the steel frame beam-reinforcing metal fixture 7-3 may be provided with a joint surface (curved surface) having the radius of curvature R alone.

FIG. 4 is a view showing a fourth example of the part 8 indicated by the broken line in FIG. 13.

As shown in FIG. 4, a steel frame beam-reinforcing metal fixture 7-4 according to the fourth example comprises an outer peripheral portion having a projecting portion atone end side. The other end side of the outer peripheral portion is formed with a first joint surface that is substantially parallel to the radial direction of the steel frame beam-reinforcing metal fixture 7-4, and a second joint surface that is inclined at the angle θ (15≦θ≦80) from the axial direction of the steel frame beam-reinforcing metal fixture 7-4. The first joint surface and second joint surface are butt-welded 10 to the steel frame beam web 5-1.

Here, the axial length ta of the steel frame beam-reinforcing metal fixture 7-4 is between 0.5 and 200.0 times the thickness tb thereof in the radial direction at the other end side. Furthermore, in the steel frame beam-reinforcing metal fixture 7-4, the length t2 from one end side of the steel frame beam web 5-1 to the other end of the outer peripheral portion is greater than the thickness tw of the steel frame beam web 5-1. Also in the steel frame beam-reinforcing metal fixture 7-4, a length L of the first joint surface on the outer peripheral portion satisfies a condition of 0≦L≦(thickness tw of the steel frame beam web 5-1).

According to the fourth example, the entire joint surface of the steel frame beam web 5-1 is welded to the outer peripheral portion of the steel frame beam-reinforcing metal fixture 7-4, and therefore the full strength of the steel frame beam can be recovered.

According to the fourth example, the second joint surface of the steel frame beam-reinforcing metal fixture 7-4 is inclined at the angle θ (15≦θ≦80) from the axial direction, and therefore slag or the like generated during welding can be discharged to the exterior of the groove, enabling easy and high quality welding.

Typically, when the volume of the weld metal 10 increases, multi-layer buildup welding must be performed, and as a result, slag remains in the weld metal, causing welding defects and the like which lead to an increase in the likelihood of flaws in the weld metal 10. In the fourth example, however, the angle of incline of the second joint surface of the steel frame beam-reinforcing metal fixture 7-4 is set at the angle θ (15≦θ≦80) from the axial direction, and therefore the volume of the weld metal 10 does not increase unnecessarily. Hence, according to the fourth example, the likelihood of flaws in the weld metal 10 can be reduced. Note that in the fourth example, the second joint surface of the steel frame beam-reinforcing metal fixture 7-4 is inclined at the angle θ (15≦θ≦80) from the axial direction, but when the angle θ is within a range of 30 to 70 degrees, the likelihood of flaws in the weld metal 10 can be reduced even further, and moreover, the required amount of weld metal 10 can be reduced, enabling a reduction in cost.

In the fourth example, the second joint surface on the outer peripheral portion of the steel frame beam-reinforcing metal fixture 7-4 is inclined from the axial direction, while the joint surface of the steel frame beam web 5-1 is substantially parallel to the axial direction. However, in the present invention, the second joint surface on the outer peripheral portion of the steel frame beam-reinforcing metal fixture 7-4 may be made substantially parallel to the axial direction, and the joint surface of the steel frame beam web 5-1 may be inclined at the angle θ (15≦θ≦80) from the axial direction.

FIG. 5 is a view showing a fifth example of the part indicated by the broken line in FIG. 13.

As shown in FIG. 5, an indirect member 11-1 is fillet-welded 9 to the outer peripheral portion of a steel frame beam-reinforcing metal fixture 7-5 according to the fifth example, and the indirect member 11-1 is fillet-welded 9 to the steel frame beam web 5-1.

Here, the axial length ta of the steel frame beam-reinforcing metal fixture 7-5 is between 0.5 and 200.0 times the thickness tb thereof in the radial direction. Also in the steel frame beam-reinforcing metal fixture 7-5, the length t1 from one end side of the steel frame beam web 5-1 to one end of the indirect member 11-1 and the length t1 from the other end side of the steel frame beam web 5-1 to the other end of the indirect member 11-1 are each at least 0.7 times the thickness tw of the steel frame beam web 5-1. Note that in the fifth example shown in FIG. 5, the length from one end side of the steel frame beam web 5-1 to one end of the indirect member and the length from the other end side of the steel frame beam web 5-1 to the other end of the indirect member are identical (both are set at t1), but this is simply for ease of description, and accordingly, the present invention is not limited to an aspect in which the length from one end side of the steel frame beam web 5-1 to one end of the indirect member and the length from the other end side of the steel frame beam web 5-1 to the other end of the indirect member are identical.

Similarly to the first example, in the fifth example the strength of the welded portion 9 is greater than the strength of the steel frame beam web 5-1, and therefore the full strength of the steel frame beam can be recovered.

FIG. 6 is a view showing a sixth example of the part 8 indicated by the broken line in FIG. 13.

As shown in FIG. 6, an indirect member 11-2 comprising a projecting portion at one end side is fillet-welded 9 to the outer peripheral portion of a steel frame beam-reinforcing metal fixture 7-6 according to the sixth example. The projecting portion at one end side of the indirect member 11-2 and a plane at the other end side thereof are respectively fillet-welded 9 to the steel frame beam web 5-1.

Here, the axial length ta of the steel frame beam-reinforcing metal fixture 7-6 is between 0.5 and 200.0 times the thickness tb thereof in the radial direction. Also in the steel frame beam-reinforcing metal fixture 7-6, the length t1 from one end side of the steel frame beam web 5-1 to one end of the indirect member 11-2 and the length t1 from the other end side of the steel frame beam web 5-1 to the other end of the indirect member 11-2 are each at least 0.7 times the thickness tw of the steel frame beam web 5-1. Note that in the sixth example shown in FIG. 6, the length from one end side of the steel frame beam web 5-1 to one end of the indirect member and the length from the other end side of the steel frame beam web 5-1 to the other end of the indirect member are identical (both are set at t1), but this is simply for ease of description, and accordingly, the present invention is not limited to an aspect in which the length from one end side of the steel frame beam web 5-1 to one end of the indirect member and the length from the other end side of the steel frame beam web 5-1 to the other end of the indirect member are identical.

Similarly to the first example, in the sixth example the strength of the welded portion 9 is greater than the strength of the steel frame beam web 5-1, and therefore the full strength of the steel frame beam can be recovered.

FIG. 7 is a view showing a seventh example of the part 8 indicated by the broken line in FIG. 13.

As shown in FIG. 7, an indirect member 11-3 comprising a projecting portion at one end side and formed with a first joint surface (curved surface) having a radius of curvature R (0≦R≦five times the thickness tw of the steel frame beam web 5-1) and a second joint surface (inclined plane) formed as a continuation of the curved surface and inclined at an angle θ (15≦θ≦80) from the axial direction at the other end side is fillet-welded 9 to the outer peripheral portion of a steel frame beam-reinforcing metal fixture 7-7 according to the seventh example. The first joint surface and second joint surface on the other end side of the indirect member 11-3 are butt-welded 10 to the steel frame beam web 5-1.

Here, the axial length ta of the steel frame beam-reinforcing metal fixture 7-7 is between 0.5 and 200.0 times the thickness tb thereof in the radial direction. In the steel frame beam-reinforcing metal fixture 7-7, the length t2 from one end side of the steel frame beam web 5-1 to the other end of the indirect member 11-3 is greater than the thickness tw of the steel frame beam web 5-1.

According to the seventh example, the entire joint surface of the steel frame beam web 5-1 is welded to the indirect member 11-3, and therefore the full strength of the steel frame beam can be recovered.

Also according to the seventh example, a curved surface is provided on the groove bottom portion 12 of the indirect member 11-3, and therefore the weld metal 10 can be welded to the groove bottom portion 12 easily. Hence, according to the seventh example, high quality welding can be performed easily at the groove bottom portion 12.

Also according to the seventh example, the second joint surface is inclined at the angle θ (15≦θ≦80) from the axial direction of the steel frame beam-reinforcing metal fixture 7-7, and therefore slag or the like generated during welding can be discharged to the exterior of the groove, enabling easy and high quality welding.

Typically, when the volume of the weld metal 10 increases, multi-layer buildup welding must be performed, and as a result, slag remains in the weld metal, causing welding defects and the like which lead to an increase in the likelihood of flaws in the weld metal 10. In the seventh example, however, the radius of curvature of the first joint surface (curved surface) on the indirect member 11-3 is set at 0≦radius of curvature R≦(five times the thickness tw of the steel frame beam web 5-1), and the angle of incline of the second joint surface (inclined plane) is set at the angle θ (15≦θ≦80) from the axial direction of the steel frame beam-reinforcing metal fixture 7-7, and therefore the volume of the weld metal 10 does not increase unnecessarily.

Hence, according to the seventh example, the likelihood of flaws in the weld metal 10 can be reduced. Note that in the seventh example, the second joint surface (inclined plane) is inclined at the angle θ (15≦θ≦80) from the axial direction of the steel frame beam-reinforcing metal fixture 7-7, but when the angle θ is within a range of 30 to 70 degrees, the likelihood of flaws in the weld metal 10 can be reduced even further, and moreover, the required amount of weld metal 10 can be reduced, enabling a reduction in cost.

In the seventh example, the first joint surface of the indirect member 11-3 is a curved surface and the joint surface of the steel frame beam web 5-1 is a plane, but in the present invention, the first joint surface and second joint surface of the indirect member 11-3 may be formed as an integral plane and the joint surface of the steel frame beam web 5-1 may be formed as a curved surface. In this case, the steel frame beam web 5-1 may be provided with an inclined plane formed as a continuation of the curved surface and inclined at the angle θ (15≦θ≦80) from the axial direction of the steel frame beam-reinforcing metal fixture 7-7.

Further, in the seventh example, the other end side of the indirect member 11-3 is formed with the first joint surface (curved surface) having the radius of curvature R and the second joint surface (inclined plane) formed as a continuation of the curved surface and inclined at the angle θ (15≦θ≦80) from the axial direction, but in the present invention, an inclined plane may be omitted, and the other end side of the indirect member 11-3 may be provided with a curved surface having the radius of curvature R alone.

FIG. 8 is a view showing an eighth example of the part 8 indicated by the broken line in FIG. 13.

As shown in FIG. 8, an indirect member 11-4 comprising a projecting portion at one end side and formed with a first joint surface which is substantially parallel to the radial direction of a steel frame beam-reinforcing metal fixture 7-8 according to the eighth example and a second joint surface which is inclined at an angle θ (15≦θ≦80) from the axial direction of the steel frame beam-reinforcing metal fixture 7-8 is fillet-welded 9 to the outer peripheral portion of the steel frame beam-reinforcing metal fixture 7-8. The first joint surface and second joint surface of the indirect member 11-4 are butt-welded 10 to the steel frame beam web 5-1.

Here, the axial length ta of the steel frame beam-reinforcing metal fixture 7-8 is between 0.5 and 200.0 times the thickness tb thereof in the radial direction. Furthermore, in the steel frame beam-reinforcing metal fixture 7-8, the length t2 from one end side of the steel frame beam web 5-1 to the other end of the indirect member 11-4 is greater than the thickness tw of the steel frame beam web 5-1. Also in the steel frame beam-reinforcing metal fixture 7-8, the length L of the first joint surface on the indirect member 11-4 satisfies a condition of 0≦L≦(thickness tw of the steel frame beam web 5-1).

According to the eighth example, the entire joint surface of the steel frame beam web 5-1 is welded to the indirect member 11-4, and therefore the full strength of the steel frame beam can be recovered.

Typically, when the volume of the weld metal 10 increases, multi-layer buildup welding must be performed, and as a result, slag remains in the weld metal, causing welding defects and the like which lead to an increase in the likelihood of flaws in the weld metal 10. In the eighth example, however, the angle of incline of the second joint surface on the indirect member 11-4 is set at the angle θ (15≦θ≦80) from the axial direction, and therefore the volume of the weld metal 10 does not increase unnecessarily. Hence, according to the eighth example, the likelihood of flaws in the weld metal 10 can be reduced.

Note that in the eighth example, the second joint surface of the steel frame beam-reinforcing metal fixture 7-8 is inclined at the angle θ (15≦θ≦80) from the axial direction, but when the angle θ is within a range of 30 to 70 degrees, the likelihood of flaws in the weld metal 10 can be reduced even further, and moreover, the required amount of weld metal 10 can be reduced, enabling a reduction in cost.

In the eighth example, the joint surface of the indirect member 11-4 is inclined from the axial direction, while the joint surface of the steel frame beam web 5-1 is substantially parallel to the axial direction. However, in the present invention, the joint surface of the indirect member 11-4 may be made substantially parallel to the axial direction, and the joint surface of the steel frame beam web 5-1 maybe inclined at the angle θ (15≦θ≦80) from the axial direction.

FIG. 9 is a view showing a ninth example of the part 8 indicated by the broken line in FIG. 13.

As shown in FIG. 9, in the ninth example, a first steel frame beam-reinforcing metal fixture 7-9-1 and a second steel frame beam-reinforcing metal fixture 7-9-2 are substantially fitted to the web opening 6 in the SRC beam 1.

The indirect member 11-1 is fillet-welded 9 to one end of the first steel frame beam-reinforcing metal fixture 7-9-1 and the other end of the second steel frame beam-reinforcing metal fixture 7-9-2, and the indirect member 11-1 is fillet-welded 9 to the steel frame beam web 5-1.

Here, the axial length ta of the steel frame beam-reinforcing metal fixture 7-9-1, 7-9-2 is between 0.5 and 200.0 times the thickness tb thereof in the radial direction. Further, in the steel frame beam-reinforcing metal fixture 7-9-1, 7-9-2, the length t1 from one end side of the steel frame beam web 5-1 to one end of the indirect member 11-1 and the length t1 from the other end side of the steel frame beam web 5-1 to the other end of the indirect member 11-1 are each at least 0.7 times the thickness tw of the steel frame beam web 5-1. Note that in the ninth example shown in FIG. 9, the length from one end side of the steel frame beam web 5-1 to one end of the indirect member 11-1 and the length from the other end side of the steel frame beam web 5-1 to the other end of the indirect member 11-1 are identical (both are set at t1), but this is simply for ease of description, and accordingly, the present invention is not limited to an aspect in which the length from one end side of the steel frame beam web 5-1 to one end of the indirect member 11-1 and the length from the other end side of the steel frame beam web 5-1 to the other end of the indirect member 11-1 are identical.

Similarly to the first example, in the ninth example the strength of the welded portion 9 is greater than the strength of the steel frame beam web 5-1, and therefore the full strength of the steel frame beam can be recovered.

FIG. 10 is a view showing a tenth example of the part 8 indicated by the broken line in FIG. 13.

As shown in FIG. 10, in the tenth example, a first steel frame beam-reinforcing metal fixture 7-10-1 and a second steel frame beam-reinforcing metal fixture 7-10-2 are substantially fitted to the web opening 6 in the SRC beam 1.

The indirect member 11-2, which comprises a projecting portion at one end side, is fillet-welded 9 to one end of the first steel frame beam-reinforcing metal fixture 7-10-1 and the other end of the second steel frame beam-reinforcing metal fixture 7-10-2. The projecting portion at one end side of the indirect member 11-2 and a plane at the other end side thereof are respectively fillet-welded 9 to the steel frame beam web 5-1.

Here, the axial length ta of the steel frame beam-reinforcing metal fixture 7-10-1, 7-10-2 is between 0.5 and 200.0 times the thickness tb thereof in the radial direction. Also in the steel frame beam-reinforcing metal fixture 7-10-1, 7-10-2, the length t1 from one end side of the steel frame beam web 5-1 to one end of the indirect member 11-2 and the length t1 from the other end side of the steel frame beam web 5-1 to the other end of the indirect member 11-2 are each at least 0.7 times the thickness tw of the steel frame beam web 5-1. Note that in the tenth example shown in FIG. 10, the length from one end side of the steel frame beam web 5-1 to one end of the indirect member 11-2 and the length from the other end side of the steel frame beam web 5-1 to the other end of the indirect member 11-2 are identical (both are set at t1), but this is simply for ease of description, and accordingly, the present invention is not limited to an aspect in which the length from one end side of the steel frame beam web 5-1 to one end of the indirect member 11-2 and the length from the other end side of the steel frame beam web 5-1 to the other end of the indirect member 11-2 are identical.

Similarly to the first example, in the tenth example the strength of the welded portion 9 is greater than the strength of the steel frame beam web 5-1, and therefore the full strength of the steel frame beam can be recovered.

FIG. 11 is a view showing an eleventh example of the part 8 indicated by the broken line in FIG. 13.

As shown in FIG. 11, in the eleventh example, a first steel frame beam-reinforcing metal fixture 7-11-1 and a second steel frame beam-reinforcing metal fixture 7-11-2 are substantially fitted to the web opening 6 in the SRC beam 1.

The indirect member 11-3, which comprises a projecting portion at one end side and is formed with the first joint surface (curved surface) having the radius of curvature R (0≦R≦five times the thickness tw of the steel frame beam web 5-1) and the second joint surface (inclined plane) formed as a continuation of the curved surface and inclined at the angle θ (15≦θ≦80) from the axial direction at the other end side, is fillet-welded 9 to one end of the first steel frame beam-reinforcing metal fixture 7-11-1 and the other end of the second steel frame beam-reinforcing metal fixture 7-11-2. The first joint surface and second joint surface on the other end side of the indirect member 11-3 are butt-welded 10 to the steel frame beam web 5-1.

Here, the axial length ta of the steel frame beam-reinforcing metal fixture 7-11-1, 7-11-2 is between 0.5 and 200.0 times the thickness tb thereof in the radial direction. Furthermore, in the steel frame beam-reinforcing metal fixture 7-11-1, 7-11-2, the length t2 from one end side of the steel frame beam web 5-1 to the other end of the indirect member 11-3 is greater than the thickness tw of the steel frame beam web 5-1.

According to the eleventh example, the entire joint surface of the steel frame beam web 5-1 is welded to the indirect member 11-3, and therefore the full strength of the steel frame beam can be recovered.

Also according to the eleventh example, a curved surface is provided on the joint surface of the indirect member 11-3, and therefore the weld metal 10 can be welded to the groove bottom portion 12 easily. Hence, according to the eleventh example, high quality welding can be performed easily at the groove bottom portion 12.

Also according to the eleventh example, the second joint surface is inclined at the angle θ (15≦θ≦80) from the axial direction of the steel frame beam-reinforcing metal fixture 7-11-1, 7-11-2, and therefore slag or the like generated during welding can be discharged to the exterior of the groove, enabling easy and high quality welding.

Typically, when the volume of the weld metal 10 increases, multi-layer buildup welding must be performed, and as a result, slag remains in the weld metal, causing welding defects and the like which lead to an increase in the likelihood of flaws in the weld metal 10. In the eleventh example, however, the radius of curvature of the first joint surface (curved surface) on the indirect member 11-3 is set at 0≦radius of curvature≦(five times the thickness tw of the steel frame beam web 5-1), and the angle of incline of the second joint surface (inclined plane) is set at the angle θ (15≦θ≦80) from the axial direction of the steel frame beam-reinforcing metal fixture 7-11-1, 7-11-2, and therefore the volume of the weld metal 10 does not increase unnecessarily. Hence, according to the eleventh example, the likelihood of flaws in the weld metal 10 can be reduced. Note that in the eleventh example, the second joint surface is inclined at the angle θ (15≦θ≦80) from the axial direction of the steel frame beam-reinforcing metal fixture 7-11-1, 7-11-2, but when the angle θ is within a range of 30 to 70 degrees, the likelihood of flaws in the weld metal 10 can be reduced even further, and moreover, the required amount of weld metal 10 can be reduced, enabling a reduction in cost.

In the eleventh example, the first joint surface on the indirect member 11-3 is a curved surface and the joint surface of the steel frame beam web 5-1 is a plane, but in the present invention, the first joint surface and second joint surface on the indirect member 11-3 may be formed as an integral plane and the joint surface of the steel frame beam web 5-1 may be formed as a curved surface. In this case, the steel frame beam web 5-1 may be provided with an inclined plane inclined at the angle θ (15≦θ≦80) from the axial direction of the steel frame beam-reinforcing metal fixture 7-11-1, 7-11-2.

Further, in the eleventh example, the other end side of the indirect member 11-3 is formed with the first joint surface (curved surface) having the radius of curvature R and the second joint surface (inclined plane) formed as a continuation of the curved surface and inclined at the angle θ (15≦θ≦80) from the axial direction, but in the present invention, an inclined plane may be omitted, and the other end side of the indirect member 11-3 may be provided with a curved surface having the radius of curvature R alone.

FIG. 12 is a view showing a twelfth example of the part 8 indicated by the broken line in FIG. 13.

As shown in FIG. 12, in the twelfth example, a first steel frame beam-reinforcing metal fixture 7-12-1 and a second steel frame beam-reinforcing metal fixture 7-12-2 are substantially fitted to the web opening 6 in the SRC beam 1.

The indirect member 11-4, which comprises a projecting portion at one end side and is formed with a first joint surface that is substantially parallel to the radial direction of the steel frame beam-reinforcing metal fixture 7-12-1, 7-12-2 and a second joint surface which is inclined at an angle θ (15≦θ≦80) from the axial direction of the steel frame beam-reinforcing metal fixture 7-12-1, 7-12-2, is fillet-welded 9 to one end of the first steel frame beam-reinforcing metal fixture 7-12-1 and the other end of the second steel frame beam-reinforcing metal fixture 7-12-2. The first joint surface and second joint surface of the indirect member 11-4 are butt-welded 10 to the steel frame beam web 5-1.

Here, the axial length ta of the steel frame beam-reinforcing metal fixture 7-12-1, 7-12-2 is between 0.5 and 200.0 times the thickness tb thereof in the radial direction. Furthermore, in the steel frame beam-reinforcing metal fixture 7-12-1, 7-12-2, the length t2 from one end side of the steel frame beam web to the other end of the indirect member 11-4 is greater than the thickness tw of the steel frame beam web 5-1. Also in the steel frame beam-reinforcing metal fixture 7-12-1, 7-12-2, the length L of the first joint surface on the indirect member 11-4 satisfies a condition of 0≦L<(thickness tw of the steel frame beam web 5-1).

According to the twelfth example, the entire joint surface of the steel frame beam web 5-1 is welded to the indirect member 11-4, and therefore the full strength of the steel frame beam can be recovered.

Typically, when the volume of the weld metal 10 increases, multi-layer buildup welding must be performed, and as a result, slag remains in the weld metal, causing welding defects and the like which lead to an increase in the likelihood of flaws in the weld metal 10. In the twelfth example, however, the angle of incline of the second joint surface on the indirect member 11-4 is set at the angle θ (15≦θ≦80) from the axial direction, and therefore the volume of the weld metal 10 does not increase unnecessarily. Hence, according to the twelfth example, the likelihood of flaws in the weld metal 10 can be reduced.

Note that in the twelfth example, the second joint surface of the steel frame beam-reinforcing metal fixture 7-12-1, 7-12-2 is inclined at the angle θ (15≦θ≦80) from the axial direction, but when the angle θ is within a range of 30 to 70 degrees, the likelihood of flaws in the welded portion can be reduced even further, and moreover, the required amount of weld metal 10 can be reduced, enabling a reduction in cost.

In the twelfth example, the joint surface of the indirect member 11-4 is inclined from the axial direction, while the joint surface of the steel frame beam web 5-1 is substantially parallel to the axial direction. However, in the present invention, the joint surface of the indirect member 11-4 may be made substantially parallel to the axial direction, and the joint surface of the steel frame beam web 5-1 may be inclined at the angle θ (15≦θ≦80) from the axial direction.

Note that in the embodiment of the present invention described above, the steel frame beam-reinforcing metal fixture is substantially fitted to a web opening provided in a steel frame beam web of a steel frame beam in an SRC structure, and by welding the fitted steel frame beam-reinforcing metal fixture to the steel frame beam web, the steel frame beam in the SRC is reinforced. Needless to say, however, the steel frame beam that is reinforced by the steel frame beam-reinforcing metal fixture according to the present invention is not limited to a steel frame beam in an SRC structure. Hence, in the present invention, the steel frame beam-reinforcing metal fixture may be substantially fitted to a web opening in an steel frame beam web of a steel frame beam in an S structure, for example, and by welding the fitted steel frame beam-reinforcing metal fixture to the peripheral edge portion of the web opening provided in the steel frame beam web, the steel frame beam in the S structure may be reinforced.

(Notes)

The present invention comprises the following notes.

(Note 1)

A steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an outer peripheral portion is fillet-welded to the steel frame beam web,

an axial length is between 0.5 and 200.0 times a thickness in a radial direction, and

a length from one end side of the steel frame beam web to one end of the outer peripheral portion and a length from another end side of the steel frame beam web to another end of the outer peripheral portion are each at least 0.7 times a thickness of the steel frame beam web.

(Note 2)

A steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an outer peripheral portion is butt-welded to the steel frame beam web,

an axial length is between 0.5 and 200.0 times a thickness in a radial direction,

a length from one end side of the steel frame beam web to another end of the outer peripheral portion is greater than a thickness of the steel frame beam web, and

a joint surface of the outer peripheral portion, which is joined to the steel frame beam web, includes a curved surface (0≦radius of curvature≦five times the thickness of the steel frame beam web).

(Note 3)

A steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an outer peripheral portion is butt-welded to the steel frame beam web,

an axial length is between 0.5 and 200.0 times a thickness in a radial direction,

a length from one end side of the steel frame beam web to another end of the outer peripheral portion is greater than a thickness of the steel frame beam web, and

a joint surface of the outer peripheral portion, which is joined to the steel frame beam web, includes a first joint surface (0≦length≦the thickness of the steel frame beam web) which is substantially parallel to the radial direction, and a second joint surface which is inclined at an angle θ (15≦θ≦80) from the axial direction.

(Note 4)

A steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length is between 0.5 and 200.0 times a thickness in a radial direction,

an indirect member fillet-welded to the steel frame beam web is fillet-welded to an outer peripheral portion, and

a length from one end side of the steel frame beam web to one end of the indirect member and a length from another end side of the steel frame beam web to another end of the indirect member are each at least 0.7 times a thickness of the steel frame beam web.

(Note 5)

A steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length is between 0.5 and 200.0 times a thickness in a radial direction,

an indirect member butt-welded to the steel frame beam web is fillet-welded to an outer peripheral portion,

a length from one end side of the steel frame beam web to another end of the indirect member is greater than a thickness of the steel frame beam web, and

a joint surface of the indirect member, which is joined to the steel frame beam web, includes a curved surface (0≦radius of curvature≦five times the thickness of the steel frame beam web).

(Note 6)

A steel frame beam-reinforcing metal fixture which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length is between 0.5 and 200.0 times a thickness in a radial direction,

an indirect member butt-welded to the steel frame beam web is fillet-welded to an outer peripheral portion,

a length from one end side of the steel frame beam web to another end of the indirect member is greater than a thickness of the steel frame beam web, and

a joint surface of the indirect member, which is joined to the steel frame beam web, includes a first joint surface (0≦length≦the thickness of the steel frame beam web) which is substantially parallel to the radial direction, and a second joint surface which is inclined at an angle θ (15≦θ≦80) from the axial direction.

(Note 7)

A pair of steel frame beam-reinforcing metal fixtures comprising a first steel frame beam-reinforcing metal fixture and a second steel frame beam-reinforcing metal fixture, which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length of the first steel frame beam-reinforcing metal fixture and the second steel frame beam-reinforcing metal fixture is between 0.5 and 200.0 times a thickness in a radial direction,

an indirect member fillet-welded to the steel frame beam web is fillet-welded to one end of the first steel frame beam-reinforcing metal fixture and another end of the second steel frame beam-reinforcing metal fixture, and

a length from one end side of the steel frame beam web to one end of the indirect member and a length from another end side of the steel frame beam web to another end of the indirect member are each at least 0.7 times a thickness of the steel frame beam web.

(Note 8)

A pair of steel frame beam-reinforcing metal fixtures comprising a first steel frame beam-reinforcing metal fixture and a second steel frame beam-reinforcing metal fixture, which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length of the first steel frame beam-reinforcing metal fixture and the second steel frame beam-reinforcing metal fixture is between 0.5 and 200.0 times a thickness in a radial direction,

an indirect member butt-welded to the steel frame beam web is fillet-welded to one end of the first steel frame beam-reinforcing metal fixture and another end of the second steel frame beam-reinforcing metal fixture,

a length from one end side of the steel frame beam web to another end of the indirect member is greater than a thickness of the steel frame beam web, and

a joint surface of the indirect member, which is joined to the steel frame beam web, includes a curved surface (0≦radius of curvature≦five times the thickness of the steel frame beam web).

(Note 9)

A pair of steel frame beam-reinforcing metal fixtures comprising a first steel frame beam-reinforcing metal fixture and a second steel frame beam-reinforcing metal fixture, which is substantially fitted to a web opening in a steel frame beam, characterized in that an axial length of the first steel frame beam-reinforcing metal fixture and the second steel frame beam-reinforcing metal fixture is between 0.5 and 200.0 times a thickness in a radial direction,

an indirect member butt-welded to the steel frame beam web is fillet-welded to one end of the first steel frame beam-reinforcing metal fixture and another end of the second steel frame beam-reinforcing metal fixture,

a length from one end side of the steel frame beam web to another end of the indirect member is greater than a thickness of the steel frame beam web, and

a joint surface of the indirect member, which is joined to the steel frame beam web, includes a first joint surface (0≦length≦the thickness of the steel frame beam web) which is substantially parallel to the radial direction, and a second joint surface which is inclined at an angle θ (15≦θ≦80) from the axial direction.

(Note 10)

The steel frame beam-reinforcing metal fixture according to any one of Notes 1 through 9, characterized in that a volume thereof is between 1.0 and 3.0 times a volume of a space portion formed in the interior of the web opening.

(Note 11)

The steel frame beam-reinforcing metal fixture according to Note 1, 4, or 7, characterized in that a flange portion having a larger outer diameter than the web opening is formed on one surface side in an axial direct ion of the outer peripheral portion.

(Note 12)

The steel frame beam-reinforcing metal fixture according to Note 1, 4, or 7, characterized in that a flange portion having a larger outer diameter than the web opening is formed on one surface side in an axial direction of the outer peripheral portion, and

the outer peripheral portion decreases gradually in diameter toward the other end side in an axial direction.

(Note 13)

The steel frame beam-reinforcing metal fixture according to Note 1, 4, or 7, characterized in that a flange portion having a larger outer diameter than the web opening is formed on one surface side in an axial direct ion of the outer peripheral portion, and

a length from a minimum outer diameter portion of the outer peripheral portion to an outer periphery of the flange portion is set at no more than half a minimum outer diameter of the outer peripheral portion, and an axial length of the flange portion is set at no more than half the axial length of the steel frame beam-reinforcing metal fixture.

(Note 14)

The steel frame beam-reinforcing metal fixture according to Note 1, 4, or 7, characterized in that a flange portion having a larger outer diameter than the web opening is formed on one surface side in an axial direction of the outer peripheral portion,

the outer peripheral portion decreases gradually in diameter toward the other end side in an axial direction, and

a length from a minimum outer diameter portion of the outer peripheral portion to an outer periphery of the flange portion is set at no more than half a minimum outer diameter of the outer peripheral portion, and an axial length of the flange portion is set at no more than half the axial length of the steel frame beam-reinforcing metal fixture.

(Note 15)

The steel frame beam-reinforcing metal fixture according to any one of Notes 1 through 9, characterized in that an inner diameter thereof is set at no more than 0.8 times a length of the steel frame beam in a height direction.

(Note 16)

The steel frame beam-reinforcing metal fixture according to Note 1, 4, or 7, characterized in that three or more positioning protruding portions which contact an inner edge portion of the web opening directly are formed on the outer peripheral portion.

(Note 17)

The steel frame beam-reinforcing metal fixture according to Note 2, 3, 5, 6, 8, or 9, characterized in that three or more positioning protruding portions which contact an inner edge portion of the web opening directly are formed on the indirect member.

(Note 18)

A steel frame beam web opening reinforcing structure formed by welding an outer peripheral portion of the steel frame beam-reinforcing metal fixture according to Note 1, 4, or 7 to a peripheral edge portion of a web opening formed in a steel frame beam constituting a column beam joining structure, characterized in that a distance from a joint position between the column and the steel frame beam to an axial center of the steel frame beam-reinforcing structure is set at no more than twice a length of the steel frame beam in a height direction.

(Note 19)

A steel frame beam web opening reinforcing structure formed by welding an indirect member welded to an outer peripheral portion of the steel frame beam-reinforcing metal fixture according to Note 2, 3, 5, 6, 8, or 9 to a peripheral edge portion of a web opening formed in a steel frame beam constituting a column beam joining structure, characterized in that a distance from a joint position between the column and the steel frame beam to an axial center of the steel frame beam-reinforcing structure is set at no more than twice a length of the steel frame beam in a height direction.

INDUSTRIAL APPLICABILITY

The steel frame beam-reinforcing metal fixture according to the present invention may be used on a steel frame beam in an S structure or a steel frame beam in an SRC structure.