Jack for stressing concrete re-inforcement elements

Details Jack for stressing concrete re-inforcement elements Jack for stressing concrete re-inforcement elements

1976-12-06

1978-08-15

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Pipe or rod jack

Tie rod tensioner

E21B 1900

Patent

active

041067525

ABSTRACT:
Disclosed is a hydraulic jack for use in stressing simultaneously, and subsequently anchoring, a plurality of concrete reinforcement elements. The jack permits an anchoring member, through which the elements pass and in which they are anchored after stressing, to move substantially freely with the elements over at least part of the stressing distance when the elements elongate while being stressed. The jack has three annular pistons (as compared with the two pistons to be found in conventional jacks). The extra piston has the function of causing forward movement of the anchoring member in the jack, after it has moved rearwardly with the elements during stressing as described above.

REFERENCES:
patent: B591615 (1976-03-01), Wyder
patent: 3333819 (1967-08-01), Brandestini
patent: 3610581 (1971-10-01), Paul
patent: 3844023 (1974-10-01), Surribas et al.

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