E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
61/47
E21D 20/02 (2006.01) E21D 20/00 (2006.01)
Patent
CA 1192754
Abstract of the Disclosure Method of rock bolting by means of a continuous stranded cable, according to which method, a feed pipe (7) is shifted to a position facing a hole (24) drilled into a rock, a stranded cable (16) being fed through the said feed pipe into the drill hole, whereupon the feed pipe is pressed sealingly against the drill hole, a cementing agent is fed throug the feed pipe into the drill hole, and finally the feed pipe is displaced from the drill hole and the stranded cable is cut off. In order to seal the space between the stranded calbe and the feed pipe, a seal (20) provided between the cable and the feed pipe is compressed axially 50 as to con- strict the seal radially around the stranded cable (16) into contact with the circumferential surface of the stranded cable. In the rock bolting equipment intended for carrying out the method, the seal (20) between the stranded cable and the feed pipe is an elastically compressible sealing ring forming a passage hole which is constricted radially as the sealing ring is compressed axially. The equipment is provided with an operating mechanism for axial compressing said sealing ring.
438638
Hamalainen Risto J.
Koistinen Pauli A.t.
Bereskin & Parr
Oy Tampella Ab
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