Method and apparatus for tensioning concrete reinforcing tendons

Details Method and apparatus for tensioning concrete reinforcing tendons Method and apparatus for tensioning concrete reinforcing tendons

1976-06-22

1979-04-03

Moon, Charlie T.

Metal working

Method of mechanical manufacture

Assembling or joining

52224, 403314, B21D 3900, E04C 508, F16B 212

Patent

active

041469518

ABSTRACT:
A method and apparatus for tensioning concrete reinforcing tendons or the like are disclosed which are particularly well suited for use in the construction of prestressed concrete tanks. The method includes mounting a wedge assembly on the tendon and mounting a wedge assembly housing around the wedge assembly, with the improvement being comprised of the steps of forming a spiral groove of relatively shallow depth in the tendon prior to mounting the wedge assembly thereon, and rotating the housing in a manner similar to a turnbuckle to simultaneously and proportionally induce radial tendon gripping forces in the wedge assembly and substantial axial tension forces in the tendon. The method has the additional advantage of preventing relative slippage between the wedge assembly and tendon even when conventional tendon jacking techniques are employed to tension the tendon.

REFERENCES:
patent: 3253332 (1966-05-01), Howlett et al.
patent: 3518748 (1970-07-01), Howlett
patent: 3837258 (1974-09-01), Williams

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