Means for anchoring to rock

Details Means for anchoring to rock Means for anchoring to rock

1978-03-27

1980-04-01

Holko, Thomas J.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

85 1C, 85 76, F16B 1310, E21D 2000, E21D 2100

Patent

active

041959523

ABSTRACT:
An improved device for anchoring mine roofs utilizing bolts prestressed to place them under high tension loading is disclosed. The bolt is secured by an anchor consisting of an expandable shell and an expander nut with the nut being movable lengthwise of the hole by turning the bolt. The surfaces of the anchor which engage the surfaces of the hole in which it is installed are coated with sand bonded thereto by a thin coat of a suitable adhesive. By the use of a polywax material to lubricate the threading of the bolt and the camming surfaces of the expander nut, very high lateral expansion forces are generated to press the sand coated surfaces of the anchor against the rock walls creating a high tension load supporting engagement between the anchor and the rock matrix.

REFERENCES:
patent: 1304885 (1919-05-01), Kennedy
patent: 1997513 (1935-04-01), Escare
patent: 2545752 (1951-03-01), Singleton
patent: 2707897 (1955-05-01), Beeson
patent: 2870666 (1959-01-01), Dempsey
patent: 3115056 (1963-12-01), Teeple
patent: 3244625 (1966-04-01), Silwones
patent: 3250170 (1966-05-01), Siegel
patent: 3324756 (1967-06-01), Williams
patent: 3385155 (1968-05-01), Michell
patent: 3620120 (1971-11-01), Warner

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