Roof control system

Details Roof control system Roof control system

1991-05-20

1993-08-03

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

4052594, 411428, 411534, E21D 2002

Patent

active

052323110

ABSTRACT:
A roof control system for underground strata has an elongated bolt adapted for insertion into a hole bored into the underground strata. The bolt is securely anchored in the hole at a location where a significant length of the bolt remains between the opening of the borehole and the anchor. A significant length of the bolt is placed in tension by rotating the bolt at a predetermined torque, with a plate mounted on the bolt and located adjacent to the outer surface of the strata and a nut on the end of the bolt for engaging the plate. The friction between adjacent surfaces which rub against each other when the bolt is rotated is selectively adjusted so that the tension/torque ratio of the bolt is selected to match the desired level for a particular type of strata. A array of friction reducing washers with different contact surface areas are provided so that one can be selected for location between the nut and plate.

REFERENCES:
patent: 4183699 (1980-01-01), Donan et al.
patent: 4195952 (1980-04-01), Swanson
patent: 4206060 (1980-06-01), Yamamoto et al.
patent: 4305687 (1981-12-01), Parker
patent: 4400113 (1983-08-01), Chaiko et al.
patent: 4619559 (1986-10-01), Norris
patent: 4746248 (1988-05-01), Lillis et al.
patent: 4984938 (1991-01-01), Scott et al.
patent: 5042961 (1991-08-01), Scott et al.

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