Yieldable rock fastener system and method

Details Yieldable rock fastener system and method Yieldable rock fastener system and method

E - Fixed Constructions

21

D

E21D 21/00 (2006.01) E21D 20/00 (2006.01)

Patent

CA 2472705

A yieldable rock fastener system has a pre-stressed seven-strand cable bolt with bulges at regular intervals. The cable bolt is inserted into a hole bored into the rock face of a mine or tunnel. The cable bolt is bonded to the rock with grout. A sleeve is press-fitted onto the cable bolt outside the rock face such that the sleeve will only yield under a load exceeding a threshold force. In the event of a rock burst or a substantial displacement of rock, the rock will push outward against a washer plate sandwiched between the rock face and the sleeve. If the load exceeds the threshold force, the sleeve will controllably yield by slipping over the cable bolt until the sleeve abuts a stopper mounted to the cable bolt. The yieldable rock fastener system thus absorbs and controls rock bursts and other rock strata movements, thereby inhibiting cave-ins and collapses.

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