Device for tensioning pre-stress bars and for determining this t

Details Device for tensioning pre-stress bars and for determining this t Device for tensioning pre-stress bars and for determining this t

1982-06-04

1984-12-04

Ciarlante, Anthony V.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Threaded fastener stress

7386254, 254 29A, G01L 500

Patent

active

044856776

ABSTRACT:
A swiveling device for tensioning a pre-stress bar having a threaded end projecting from an end face of the element to be pre-stressed comprises a jack having a movable part attached to the bar and a fixed part bearing against the element. A first bearing plate is mounted on the end face of the element around the bar and includes an annular spherical cup surface. A swivel joint nut is threaded on the end of the bar and has a spherical ball part seated in the cup surface of the first bearing plate forming a first swivel joint. A second bearing plate is slidably disposed on a face of the first bearing plate and includes a second annular spherical cup surface. The end of the fixed part of the jack proximate the element includes a spherical surface seated in the second annular spherical cup surface forming a second swivel joint.

REFERENCES:
patent: 2889729 (1959-06-01), Orner
patent: 3242725 (1966-03-01), Carrie
patent: 3858846 (1975-01-01), Schmid
patent: 3943819 (1976-03-01), Charron

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