Making a prestressed concrete beam

Details Making a prestressed concrete beam Making a prestressed concrete beam

1991-01-14

1993-03-23

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

And means to apply stress to preform and uniting in stressed...

249 46, 249 97, 2492191, 264228, 264229, B28B 2306

Patent

active

051962098

ABSTRACT:
A prestressed concrete beam is made by first fitting the opposite ends of a group of reinforcing rods through respective holes in a pair of longitudinally spaced end plates having longitudinally confronting inner faces and opposite outer faces, then providing on each of the rods a head bearing longitudinally inward on the respective outer face, and then applying opposite outward traction to the end plates to tension the rods and filling around the rods and between the inner faces of the plates with a mass of concrete. The concrete mass is then cured and the traction on the end plates is released. Subsequently the heads of the rods are released from the plates and the plates are removed from the ends of the mass of cured concrete. The heads can be machined or burnt off, or the plate can be constructed to release them.

REFERENCES:
patent: 2655708 (1953-10-01), Eschenbrenner
patent: 2867884 (1959-01-01), Brandt
patent: 3236486 (1966-02-01), Allen
patent: 3427772 (1969-02-01), Williams
patent: 3462106 (1968-08-01), Buyken
patent: 3583047 (1971-06-01), Uchiyama
patent: 3734453 (1973-05-01), Bailey
patent: 3962786 (1976-06-01), Mori et al.
patent: 4421710 (1983-12-01), Borcoman

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