Mine roof support system including an expansion anchor with mean

Details Mine roof support system including an expansion anchor with mean Mine roof support system including an expansion anchor with mean

1995-09-13

1997-02-04

Novosad, Stephen J.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

4052593, 4052594, E21D 2000, E21D 2002, E21D 2100

Patent

active

055991408

ABSTRACT:
A reinforcing and support system and method of installation thereof including both a mechanical expansion anchor on the distal end of an elongated bolt and a resin grouting mix installed in a blind drill hole in a mine roof, or the like. A pair of elongated leg members, fixed with respect to the shell, extend into the annular space surrounding the bolt below the shell for a distance about as great as the axial length of the shell. Upon advance of the bolt, carrying the expansion anchor and leg members, into the drill hole to break a cartridge containing the initially flowable components of the grouting material, the bolt is rotated to effect expansion of the anchor and tensioning of the bolt. Mixing of the components in the annular space surrounding the bolt below the anchor as the bolt is rotated is enhanced by hydraulic turbulence produced by flow of the components about the leg members. A support nut may be installed on the bolt below the anchor, and the leg members may be fixedly attached to one another near their terminal ends.

REFERENCES:
patent: 4516886 (1985-05-01), Wright
patent: 4626139 (1986-12-01), Blackwell
patent: 4861198 (1989-08-01), Stankus
patent: 5018908 (1991-05-01), Laphon
patent: 5076733 (1991-12-01), Frease
patent: 5112160 (1992-05-01), Jensen et al.
patent: 5219248 (1993-06-01), Wright
patent: 5222835 (1993-06-01), Wright
patent: 5275512 (1994-01-01), Wright
patent: 5344257 (1994-09-01), Wright et al.

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