Mine roof support apparatus and system
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United States of America Patent
Stats
-
Mar 3, 2015
Grant Date -
Nov 8, 2012
app pub date -
May 7, 2012
filing date -
May 5, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A cable bolt includes a multi-strand cable segment constructed from steel wire strands, and a drive head. A compressible porous backer rod is placed along cable segment adjacent the drive head. A tubing portion provides a conduit for liquid grout injected under pressure into the bore hole. Tubing portion includes discharge holes that may be predrilled through the wall of the tubing portion. The holes provide a predetermined distribution path for the liquefied grout that is injected into the bore hole. Discharge holes may be evenly dispersed longitudinally along the wall, or distributed to provide a desired, unequal distribution of grout. Distribution holes may be larger at the top of the tubing, or may be distributed adjacent to the top of tubing portion to allow greater cross-sectional flow of grout from the tubing to compensate for factors that restrict grout flow nearer the top.
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Cited Art Landscape
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