Method of supporting a mine roof using nut element with breakabl

Details Method of supporting a mine roof using nut element with breakabl Method of supporting a mine roof using nut element with breakabl

1984-05-22

1987-05-05

Wolfe, Robert L.

Hydraulic and earth engineering

Earth treatment or control

Chemical

10 86C, 405260, 411 8, 411429, E21D 2002

Patent

active

046627952

ABSTRACT:
A nut element having a frangible portion for use with an elongated bar having an upper end anchored by a resin material within a drill hole in a mine roof, or the like, and a lower end extending outside the hole and threaded to receive the nut element of the invention. The nut includes a portion spaced from the threaded opening which limits relative rotation of the nut and bar. Thus, rotation of the nut with the lower end of the bar contacting the rotation-limiting portion thereof serves to rotate the bar within the drill hole, causing the upper end of the bar to rupture a conventional two-compartment resin cartridge and mix the contents thereof. When the resin has hardened to hold the bar stationary, excess torque applied to the nut serves to break the rotation-limiting portion thereof, preferably a dome-shaped cap with an opening of smaller diameter than the threaded end of the bar, allowing the nut to be snugly secured against a roof support plate and tension the resin-anchored bar.

REFERENCES:
patent: 19645 (1890-02-01), Keep
patent: 680991 (1901-08-01), Crosby
patent: 692812 (1902-02-01), Anderson
patent: 1456215 (1923-05-01), Brightman
patent: 3737027 (1973-06-01), Ball
patent: 3979918 (1976-09-01), Vidler
patent: 4183699 (1980-01-01), Donan, Jr. et al.
patent: 4295761 (1981-10-01), Hansen
patent: 4347020 (1982-08-01), White et al.

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