Mine roof expansion anchor, expansible shell element used therei

Details Mine roof expansion anchor, expansible shell element used therei Mine roof expansion anchor, expansible shell element used therei

1995-03-24

1996-03-26

Novosad, Stephen J.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

4052596, 411 33, 411 82, E21D 2002

Patent

active

055015514

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.

REFERENCES:
patent: 4299515 (1981-11-01), Yates et al.
patent: 4861198 (1989-08-01), Stankus
patent: 5009549 (1991-04-01), Stankus
patent: 5316414 (1994-05-01), Wright
patent: 5352066 (1994-10-01), Schaeffer et al.

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