Raise-boring

Details Raise-boring Raise-boring

E - Fixed Constructions

21

B

255/50

E21B 10/00 (2006.01) E21B 3/00 (2006.01) E21B 7/28 (2006.01) E21B 15/00 (2006.01)

Patent

CA 1068677

ABSTRACT OF THE DISCLOSURE. A drill hole in a rock body is collared by drilling a pilot hole into a tunnel, advancing the pilot drill across the tunnel to drill a hole in the opposite wall of the tunnel aligned with the pilot hole, mounting the borer head on an arbour located across the tunnel in both holes, rotating the borer head to collar the hole, and de- taching the borer head from the arbour.

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