Mine roof expansion anchor, expansible shell element used therein and method of installation
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United States of America Patent
Stats
-
Mar 26, 1996
Grant Date -
N/A
app pub date -
Mar 24, 1995
filing date -
Mar 24, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mechanical expansion anchor and radially expansible shell for use therein having particular application in combination with resin grouting materials. The anchor includes a conventional, tapered camming plug moveable axially upon a mine roof bolt to move the shell leaves outwardly into gripping engagement with the drill hole wall. The shell is distinguished by the provision of grooves in the outer surfaces of the shell leaves, extending between the upper and lower ends of the leaves. Components of a resin mix inserted into the drill hole in advance of the expansion anchor, carried on the end of the bolt, flow through the grooves in the outer leaf surfaces to the area below the anchor.
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Cited Art Landscape
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