Title:
COMPOSITE PILLAR FOR JUNCTION CONNECTIONS ON CONSTRUCTIONS AND BUILDING FRAMES
Kind Code:
A1


Abstract:
In order to make available an arrangement for joining a composite pillar (1) to a beam (9, 10) of a building frame, in which the composite pillar has at least one vertical steel girder (2) and a steel enclosure (3) located at least in the connection region on all sides with a distance from the steel girder, and the space (4) between the steel girder and the enclosure being filled with a filler, and a building frame with this arrangement, in which the force from the beam can be delivered into the composite pillar both statically and economically, it is suggested that at least one connecting element (6) which extends between the steel girder and enclosure is attached to the steel girder and that in the enclosure in the region of the connecting element there is an opening (11) through which the beam can be connected to the steel girder.



Inventors:
Douet, Bernard (Bordeaux, FR)
Application Number:
12/088695
Publication Date:
02/12/2009
Filing Date:
09/28/2006
Primary Class:
International Classes:
E04B1/30; E04C3/34
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Primary Examiner:
FERENCE, JAMES M
Attorney, Agent or Firm:
NIXON & VANDERHYE, PC (ARLINGTON, VA, US)
Claims:
1. Arrangement for joining a composite pillar (1) to a beam (9, 10) of a building frame, the composite pillar (1) having at least one vertical steel girder (2) and a steel enclosure (3) located at least in the connection region on all sides with a distance from the steel girder (2), and the space (4) between the steel girder (2) and the enclosure (3) being filled with a filler such as concrete, characterized in that at least one connecting element (6) which extends between the steel girder and enclosure (3) is attached to the steel girder (2) and that in the enclosure in the region of the connecting element (6) there is an opening (11) through which the beam (9, 10) can be connected to the steel girder.

2. Arrangement as claimed in claim 1, wherein two or more connecting elements (6) are attached to the steel girder (2) and extend between the steel girder (2) and enclosure (3) and wherein in the enclosure (3) in the region of the connecting elements (6) there are openings (11) through which beams (9, 10) can be connected to the connecting elements (6).

3. Arrangement as claimed in claim 1, wherein the connecting element (6) extends as far as the inside surface (8) of the enclosure (3).

4. Arrangement as claimed in claim 1, wherein the connecting element (6) is connected to the enclosure (3).

5. Arrangement as claimed in claim 1, wherein a flange (7) is attached to the end of the connecting element (6) which faces the enclosure (3).

6. Arrangement as claimed in claim 5, wherein the flange (7) is connected to the enclosure (3).

7. Arrangement as claimed in claim 3, wherein at least one connecting bolt, one connecting screw or the like by which the beam (9, 10) can be connected to the connecting element (6) extends through the opening (11).

8. Arrangement as claimed in claim 7, wherein there are several openings (11) and a corresponding number of connecting bolts, connecting screws or the like per connecting element (6).

9. Building frame with connecting junctions, on which pillars with beams (9, 10) are connected, at least one pillar being a composite pillar (1) with at least one vertical steel girder (2) and a steel enclosure (3) located on all sides with a distance from the steel girder (2), and the space (4) between the steel girder (2) and the enclosure (3) being filled with a filler such as concrete, wherein at least one connecting junction has the arrangement as claimed in claim 1.

10. Arrangement as claimed in claim 2, wherein the connecting element (6) extends as far as the inside surface (8) of the enclosure (3).

11. Arrangement as claimed in claim 2, wherein the connecting element (6) is connected to the enclosure (3).

12. Arrangement as claimed in claim 3, wherein the connecting element (6) is connected to the enclosure (3).

13. Arrangement as claimed in claim 2, wherein a flange (7) is attached to the end of the connecting element (6) which faces the enclosure (3).

14. Arrangement as claimed in claim 3, wherein a flange (7) is attached to the end of the connecting element (6) which faces the enclosure (3).

15. Arrangement as claimed in claim 4, wherein a flange (7) is attached to the end of the connecting element (6) which faces the enclosure (3).

16. Arrangement as claimed in claim 4, wherein at least one connecting bolt, one connecting screw or the like by which the beam (9, 10) can be connected to the connecting element (6) extends through the opening (11).

17. Arrangement as claimed in claim 5, wherein at least one connecting bolt, one connecting screw or the like by which the beam (9, 10) can be connected to the connecting element (6) extends through the opening (11).

18. Arrangement as claimed in claim 6, wherein at least one connecting bolt, one connecting screw or the like by which the beam (9, 10) can be connected to the connecting element (6) extends through the opening (11).

Description:

The invention relates to an arrangement for joining a composite pillar to the beam of a building frame, the composite pillar having at least one vertical steel girder and a steel enclosure located at least in the connection region on all sides with a distance from the steel girder, and the space between the steel girder and the enclosure being filled with a filler such as concrete, and a building frame with connecting unctions with this arrangement.

In the erection of building frames of reinforced concrete, composite pillars are known which generally consist of three components, specifically a girder in the form of a steel profile as well as concrete and optionally additional reinforcement. In composite pillars there are various possibilities of forming the cross section, and fundamentally it is possible to distinguish between concrete-filled round pipes or hollow sections, steel profiles with cellular concrete and completely concrete-encased steel profiles. In steel profiles with cellular concrete the outside surface of the composite pillar is partially formed by the steel profile and partially by the concrete. For concrete-encased steel profiles the steel profile is surrounded on all sides by concrete.

The invention conversely relates to concrete-filled round pipes or hollow sections in which the outside surface of the composite pillar is formed by the round pipe or hollow section which thus at the same time constitutes the form for the composite pillar. Furthermore, in the arrangement as claimed in the invention within the enclosure in the form of a round pipe or hollow section there are one or more steel girders, away from which the steel enclosure is spaced.

To produce the connecting junctions, in these composite pillars it was conventional for a long time to attach the beams to the outer steel enclosure, i.e. to screw or weld them on. The delivery of force from the beam into the composite pillar therefore takes place via the enclosure into the reinforced concrete and from the latter, further into the steel girder, the critical regions of load transfer constituting the separating surfaces between the steel and concrete, so that additional measures must be taken to ensure sufficient load transfer to the separating surfaces.

AT 405 067 B discloses lining the beams and vertical members and their connections such that the formwork of the beams and vertical members and their connections is spaced on all sides so that the beams and vertical members and their connections are completely enclosed by concrete.

The object of the invention is to make available a generic arrangement and a building frame with such an arrangement in which the force can be delivered from the beam into the composite pillar both statically and also in an economically advantageous manner.

This object is achieved using an arrangement with the features of claim 1 and using a building frame with the features of claim 9.

In the invention there are connecting elements which are attached to the steel girder and which extend only within the enclosure. This makes it possible either to deliver steel girders to the construction site in which the connecting elements are already attached, or they can be attached on site to the steel girders before the enclosure is mounted around the steel girder. The connecting elements can also be used as spacers for exact positioning of the enclosure around the steel girder. But fundamentally it is of course also possible to attach some or all of the connecting elements only after positioning of the enclosure if there is sufficient accessibility. In this case the connecting elements could also project through the opening as far as the outer periphery of the enclosure.

Since there is an opening in the region of each connecting element in the enclosure, the beam can be attached directly to the connecting element, i.e. screwed or welded to it so that force is delivered from the beam into the composite pillar directly into the steel girder. Since the connecting element after filling the cavity between the steel girder and the enclosure is surrounded by concrete, the force is also delivered directly into the concrete or reinforced concrete.

This construction can be used with special static and economic advantage in a structure with interpenetrating frame elements, as is known from AT 405 661 B, since several links to the connection point of a junction are necessary there and are to be enclosed with concrete.

If necessary the connecting element and/or the beam can also be connected directly to the enclosure so that forces can also be directly delivered into the enclosure.

The connecting element advantageously extends directly as far as the inside surface of the enclosure and closes the opening so that no additional measures need be taken against the emergence of concrete in the region of the opening.

In one preferred embodiment of the invention it can be provided that a flange is attached to the end of the connecting element facing the enclosure.

This flange which preferably adjoins the inside surface of the enclosure with consideration of production engineering inaccuracies makes it possible to equalize positioning errors of the enclosure and manufacturing inaccuracies in the production of the opening when the area of the flange is greater than the area of the opening, since the opening then need not be positioned exactly with reference to the connecting element. Moreover the flange can facilitate the joining of the connecting element to the enclosure which is desired under certain circumstances.

With respect to the opening which is provided for each connecting element in the enclosure there is either the possibility of providing a single opening, which is so large that the beam with its entire connection region can be located within the opening or can be connected to the connecting element. Alternatively it is also possible to provide several openings per connecting element, through which connecting bolts, connecting screws or the like project, using which the beam is connected to the connecting element. This embodiment would have the advantage that at the same time the enclosure would also be fixed and held between the connecting element and the connection region of the beam. But fundamentally the latter advantage can also be achieved for only a single opening when the connecting element or its flange and the connection region of the beam are larger than the opening.

In the production of building frames it is generally the case in the region of the connecting junctions that not only one, but several beams must be connected in the region of a connecting junction to a composite pillar. For this case, in the region of the connecting junction a number of connecting elements and openings assigned to them which corresponds to the number of beams are provided in the enclosure to which the beams can be connected.

Within the framework of the invention it is however also possible in the region of the connecting junctions to provide for example four connecting elements on a standard basis, which as mentioned are used at the same time also as spacers for the enclosure, if necessary only in the region of those connecting elements to which beams are to be connected are openings cut out in the enclosure, conversely in the region of the connecting elements to which beams need not be connected the enclosure remains closed, or, if it is prefabricated, is closed.

Other features and advantages of the invention will become apparent from the following description of one preferred embodiment of the invention with respect to the drawings.

FIG. 1 shows a front view of the connecting junction with an arrangement as claimed in the invention on a composite pillar 1,

FIG. 2 shows a top view of the arrangement from FIG. 1 and FIG. 3 shows a section along line III-III of FIG. 2.

FIGS. 1 to 3 show one embodiment of a connecting junction on a composite pillar 1 with an arrangement according to this invention. The composite pillar in this embodiment is a so-called double pipe column consisting of a middle tubular steel beam 2 and a likewise tubular enclosure 3 which is arranged concentrically to the girder 2 and which likewise consists of steel. The enclosure can consist of a continuous closed pipe or of a pipe assembled from several parts. For example the enclosure 3 can consist of two half shells which are interconnected at two connecting sites which run lengthwise. Between the girder 2 and the enclosure 3 a space 4 is formed which for a finished composite pillar is filled with a filler mass, generally concrete. The cavity 5 within the girder 2 can likewise be filled with concrete. Instead of a tubular girder 2 also any other steel girders, for example extruded profiles, special rolled steel sections, crossed rolled steel sections of any shape or polygonal sections can also be used. Instead of hollow sections or rolled sections, solid sections can also be used as girders 2. It is common to all embodiments of these sections or girders that they are spaced apart from the enclosure 3.

In this embodiment, four connecting elements 6 in the form of I sections are welded to the girder 2. On the end facing the enclosure 3, flanges 7, face plates or the like which adjoin the inside surface 8 of the enclosure 3 are welded to the connecting element 6. The connecting elements 6 with the flanges 7 thus form spacers within the space 4 which ensure exact spacing of the enclosure 3 with reference to the girder 2 on all sides.

In the region of the junction of the composite pillar 1 shown in FIGS. 1 to 3, two beams 9 and 10 are connected to the composite pillar 1. For this purpose, on the two connecting elements 6 assigned to the beams 9 and 10 there are two rectangular openings 11 in the enclosure 3 which are somewhat smaller than the flanges 7 from their outside dimensions. For this reason complete sealing of the opening 11 is also ensured when the opening 11 is not located exactly in the region of the assigned connecting element or its flange 7.

But it is also possible not to close the opening 11 so that concrete can pass through the opening 11 so that the connecting element 6 and if present a flange 7 or the like and the connected beams 9, 10 are completely enclosed by concrete, as is known from AT 405 067 B. Likewise it is also possible to make further openings around the connecting region or the opening 11 in the enclosure 3, through which concrete can pass in order to join the concrete jacketing of the beam 9, 10.

On the lower side of the enclosure 3 in FIG. 2 another opening 11 is shown, since a beam must still be connected to this connecting element 6. On the top side of the enclosure 3 in FIG. 2 there is no opening 11 since a beam is not to be connected to the connecting element 6 there.

The beams 9, 10 can be connected directly to the respective connecting element 6 with its flange 7 through the openings 11 in the enclosure 3. In order to connect the beams 9, 10 to the flanges 7, they are welded or screwed to the flanges 7. Since the opening 11 is somewhat larger than the cross section of the beams 9 and 10, possible inaccuracies in the production or positioning of the beams 9, 10 or of the composite pillar 1 can be equalized here.

The openings 11 in the enclosure 3 can be prefabricated before their positioning over the steel girder 2. The openings 11 can however also be cut out only if the enclosure 2 was located around the steel girder 2 since it is possible in this way to produce the openings 11 exactly at the locations at which later the beams 9, 10 are also to be connected.

It goes without saying that there need not necessarily be flanges 7 on the connecting elements 6, so that the beams 9, 10 are attached directly to the connecting elements 6. In this case the openings 11 would have to be manufactured either so exactly that when the space 4 is filled with concrete no noteworthy emergence of concrete takes place, or measures can be easily taken to seal the remaining spaces of the opening 11.

The connecting elements 6 and if present their flanges 7 or the like can likewise be connected to the enclosure 3 for example by welding or screwing. This can take place either from the outside through the opening 11 or from the inside, in this case sufficient accessibility or size of the space 4 between the enclosure 3 and the girder 2 having to be ensured.

If necessary, in the space 4 there can additionally be reinforcement, and the connecting elements 6 can be used in a practical manner for positioning and attachment of the reinforcement.

After attaching the beams 9, 10 to the composite pillar 1 they can be lined and completely or only partially concrete-encased, depending on for what purpose the beams 9, 10 are to be subsequently used. The beams 9, 10 can furthermore be not only beams in the actual sense which lead to other pillars or composite pillars, but also can be used as a transverse force connections for flat slab floors or the like.

It is shown that the beam forces are delivered not only directly into the girder 2 by the connection of the beams 9, 10 to the connecting elements 6, but also directly into the concrete or reinforced concrete which surrounds the girder 2 and in which the connecting elements 6 are embedded. Optionally, by connecting the beams 9, 10 and/or the flanges 7 or the connecting elements 6 to the enclosure 2, forces can be delivered directly into them. Thus, the disadvantages which are known in comparable composite pillars of the prior art are avoided, i.e. that the beam forces are delivered via the enclosure 3 to the concrete and consequently only then to the steel girder 2.

Finally, according to one embodiment which is not shown in the drawings, it is also possible to produce a connection between the beams 9, 10 and connecting element 6 and flange 7 by for example holes or openings being made in the enclosure 3 through which connecting screws or bolts project, using which the connecting elements 6 or their flanges 7 can be joined directly to the beams 9, 10, if there are connecting regions configured accordingly on the beams 9, 10.