Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1990-04-05
1991-11-12
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
4052595, 4052594, 411 11, 411302, F21D 2102
Patent
active
050643118
ABSTRACT:
An assembly and methods of installation thereof for supporting and stabilizing a rock structure adjacent a mine tunnel or other underground passageway. The assembly includes an elongated bolt, threaded from both ends for at least a portion of its length. A conventional, mechanical expansion anchor is threaded on one end of the bolt, within a drill hole in the rock structure, and a bearing plate, washer, jam nut and tensioning nut are carried on the other end, outside the drill hole. The tensioning nut is threaded into firm engagement with the jam nut to prevent further threaded advance of the tensioning nut a substantial distance from the termination of the threads. A torque applied to the tensioning nut thus rotates the bolt and expands the anchor shell into gripping engagement with the bore hole wall; torque producing an axial load on the jam nut in excess of its strength causes it to fracture or strip from threaded engagement with the bolt, permitting travel of the tensioning nut. The jam nut is received in a recess in the lower surface of the washer, which is preferably spherical on its upper surface.
REFERENCES:
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patent: 2330999 (1943-10-01), Ruthven
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patent: 3090203 (1963-05-01), Durget
patent: 3940941 (1976-03-01), Libert et al.
patent: 4322193 (1982-03-01), Stahl
patent: 4619559 (1986-10-01), Norris
patent: 4662795 (1987-05-01), Clark et al.
Giroux Roger
Wright Raymond L.
Corbin David H.
McGuire Charles S.
Olsen Arlen L.
The Eastern Company
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