Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1988-08-08
1990-06-19
Reese, Randolph A.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405259, E21D 2100
Patent
active
049348736
ABSTRACT:
A roof support for an underground mine or the like is disclosed. The roof support is comprised of two roof anchors that are secured in bore holes formed in the mine roof with a cross member tensioned between the roof anchors. The roof anchors have eye-bolt heads formed on the ends which protrude from the roof and to which the cross member is readily secured. A tensioning means is provided to tension the cross member and the major portion of the cross member may be either a rigid metal rod or a flexible wire rope cable. The present invention also provides for a roof anchor that is formed from concrete reinforcing bar which has an eye-bolt head that is hot forged onto the reinforcing bar.
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Jennmar Corporation
Olsen Arlen L.
Price, Jr,. Stanley J.
Reese Randolph A.
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