Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1987-09-23
1988-08-16
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Chemical
411 51, 411 57, E21D 2002
Patent
active
047640553
ABSTRACT:
A resin reinforced expansion anchor system for a mine roof support bolt or the like utilizes a specially configured, thin-walled expansion shell together with a thin-walled, dual-taper plug for expanding the shell. The shell and the plug cooperate to implement a particularly desirable type of mechanical expansion anchoring action while simultaneously providing a symmetrical array of resin flow passages at circumferentially spaced locations about the anchor assembly to permit proper distribution and flow of a quick setting resin mix. The system of the invention enables a relatively large diameter rock bolt or threaded bar to be securely anchored in a blind drilled hole that is of relatively small diameter, with the anchoring action of a mechanical expansion anchor assembly being desirably augumented by the anchoring action of a concurrently established resin bond. The system of the present invention has particular utility in providing a means for effecting combined mechanical expansion anchoring and resin bond anchoring of a relatively large diameter threaded member such as a 7/8" rock bolt that is installed in a relatively small diameter hole such as a 13/8" blind drilled hole that is formed in a mine roof or the like.
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Clark Carl A.
Wright Raymond L.
Birmingham Bolt Company, Inc.
Corbin David H.
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