Title:
Apparatus for making longitudinally prestressed concrete pipes
United States Patent 3234619
Inventors:
Vitz, John E.
Publication Date:
02/15/1966
Export Citation:
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Assignee:
CEN VI RO PIPE CORP
Primary Class:
425/111
Other Classes:
249/85, 249/97, 254/29A, 264/228
International Classes:
B28B21/60; B28B21/00
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US Patent References:
3046631Apparatus and method for making prestressed concrete tubular members
2775262Semi-steel reinforced concrete pipe
2709845Method of applying pressure to the surface of newly formed concrete or like cementitious products
2707003Pipe sections with moulded spigots
2602469Reinforced concrete pipe
2582751Method of prestressing reinforced concrete pipes
2234663Method of reinforcing building units
2193078Method of making form ties
Foreign References:
FR1002565A