Roof bolts for mines and the like workings

Details Roof bolts for mines and the like workings Roof bolts for mines and the like workings

1983-03-02

1985-02-12

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Chemical

405259, 405258, 405244, E02D 574

Patent

active

044988176

ABSTRACT:
In the installation of a roof bolt in the roof of a mine, a hole is driven vertically upwards into the rock above the mine roof and the bolt is pushed up the hole. Moist grit is blown up the annular gap around the shank of the bolt and packs into the gap to anchor the bolt in place. The air can escape from the bottom of the hole. The bolt may be tubular and form a duct for escaping air. When the gap is full of grit a sealing washer is pushed into the bottom part of the hole. A roof plate is located against the roof and held in place by a nut screwed to the projecting lower end portion of the bolt.

REFERENCES:
patent: 3212269 (1965-10-01), Olsen
patent: 3326004 (1967-06-01), Williams
patent: 3754401 (1973-08-01), Lipow
patent: 4116368 (1978-09-01), Smith

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