Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1997-05-08
1999-09-21
Neuder, William
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
4053022, E21D 2002, E21D 2102
Patent
active
059544554
ABSTRACT:
A tensionable combination mine roof bolt is disclosed for use in resin grouted applications. The mine roof bolt includes a lower 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 lower rod member therein. A shearable stop device, such as a shear pin, is positioned within the coupling and adapted to stop the threaded lower 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 lower 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 advertisment for Dywidag Tensionable Cable Bolt, Dywidag Systems International, USA, Inc. (Feb. 1994).
Calandra, Jr. Frank
Eaton Jack R.
Oldsen John G.
Stankus John C.
Jennmar Corporation
Mayo Tara L.
Neuder William
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