Controlled yielding rock bolt

Details Controlled yielding rock bolt Controlled yielding rock bolt

1975-02-03

1976-07-06

Taylor, Dennis L.

85 62, 73 88E, E21D 2102

Patent

active

039674550

ABSTRACT:
A bolt assembly for supporting a mine roof or the like is disclosed having a yieldable coupling means at least at one end to allow controlled sagging of the rock to prevent exceeding the elastic limit of the bolt. An expandable anchor may be provided at the other end. The coupling means includes a collar having a die movable along deformable threads of the bolt when the rock load increases. This relative movement provides relief thereby assuring against the bolt becoming excessively tensioned. The die deforms the threads by coldflow extruding and flattening action against the crest of the threads. This action forms a frictional holding interface between the bolt and the collar and maintains substantially constant tension in the bolt. A nut on the collar transmits the supporting force to the rock face. A removable cap nut may be threaded onto the bolt to properly pre-position the parts and transmit torque to the anchor during installation.

REFERENCES:
patent: 2738754 (1956-03-01), Bierer
patent: 2879686 (1959-03-01), Lewis et al.
patent: 3161174 (1964-12-01), Harrison
patent: 3283566 (1966-11-01), Fietz
patent: 3460258 (1969-08-01), Geary et al.
patent: 3646553 (1972-02-01), Conkle
patent: 3826128 (1974-07-01), McVey et al.

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