Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1988-12-13
1990-08-07
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405259, E21D 2100
Patent
active
049463152
ABSTRACT:
Apparatus (1) for supporting a mine roof (R) has connected plates (7, 9) positioned against the roof at opposite sides of the mine roof. One plate (7) has an upset surface (13) contacting the roof to exert a compressive load on it. Bolts (53) anchor the plates to the roof. A tie rod (64) interconnects the plates and is adjustable to vary the compressive load, and in one embodiment a slip anchor (67) is provided at one end of the tie rod which can also be utilized to estimate the tie rod load.
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Alongi John R.
Chugh Yoginder P.
Linton Joey
Corbin David H.
Hind Ronald W.
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