Rockbolt tensioning

Details Rockbolt tensioning Rockbolt tensioning

1993-02-09

1995-08-22

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

4052592, 411 1, 411 5, E21D 2002

Patent

active

054433320

ABSTRACT:
A rockbolt for anchoring in a borehole and then tensioning it has a nut at its distal end whose screw threaded engagement with the rockbolt is utilised to force the nut against the surface at which the borehole is provided and cause tensioning of the rockbolt. Initially, the nut cannot be run down the rockbolt owing to provision of a disc seated in a recess at the distal end of the nut and which is only forced out from the recess when the nut is subject to a minimum predetermined torque. Holding of the disc in the recess is achieved by deformations of the nut resulting in the perimeter of the disc being frictionally restrained.

REFERENCES:
patent: 3877235 (1975-04-01), Hill
patent: 4295761 (1981-10-01), Hansen
patent: 4347020 (1982-08-01), White et al.
patent: 4386877 (1983-06-01), McDowell
patent: 4556350 (1985-12-01), Bernhardt et al.
patent: 4662795 (1987-05-01), Clark et al.
patent: 4955758 (1990-09-01), Hyde
patent: 5352065 (1994-10-01), Arnall et al.

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