Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1996-01-11
1998-07-28
Graysay, Tamara L.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
4052595, 405288, E21D 2000, E21D 2002
Patent
active
057854637
ABSTRACT:
A tensionable combination cable mine roof bolt is disclosed for use in resin grouted applications. The mine roof bolt includes a rod member having a rotatable bolt head at a first end thereof supporting a bearing plate and a threaded second end spaced from the first end. A coupling threadingly receives the rod member therein. A shearable stop device, such as a shear pin, is positioned within the coupling and adapted to stop the threaded rod member at a first position for rotation of the cable mine roof bolt during installation. After an upper portion of the cable mine roof bolt is secured, the shearable stop mechanism is subsequently sheared by the rod member to allow for tensioning of the cable mine roof bolt. A flexible multi-strand cable is coupled to the coupling device and forms the attachment point for the cable mine roof bolt.
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One-page advertisement for the Dywidag Tensionable Cable Bolt, Dywidag Systems International, USA, Inc. (Feb. 1994).
Calandra, Jr. Frank
Eaton Jack R.
Oldsen John G.
Graysay Tamara L.
Jennmar Corporation
Mayo Tara L.
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