Rock reinforcement system

Details Rock reinforcement system Rock reinforcement system

1980-01-16

1981-11-10

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

405261, 411 45, E21D 2002, F16B 2002

Patent

active

042995159

ABSTRACT:
A system for reinforcing a rock formation, such as in mining or tunneling operations, wherein an elongated bolt is anchored in a blind drill hole in the rock formation by both a mechanical expansion anchor and a resin grouting mix. The invention is particularly directed to novel means which prevent relative rotation of the bolt and anchor in one direction and allow relative rotation in the opposite direction, whereby a conventional, two-compartment resin cartridge can be broken and its contents mixed while rotating the bolt and anchor in the first direction, and the anchor expanded to tension the bolt by reversing the direction of rotation before the resin mix hardens. The novel means comprise a collar element which is affixed to the end of the bolt above the expansion anchor and cooperatively engages a stop means on the anchor in only one direction of bolt rotation. A number of alternative means are disclosed for affixing the collar to the bolt.

REFERENCES:
patent: 3139730 (1964-07-01), Williams et al.
patent: 4162133 (1979-07-01), Clark et al.
patent: 4192631 (1980-03-01), Vass
patent: 4194858 (1980-03-01), Evans

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