Method and apparatus for breaking a full face of rock for...

Details Method and apparatus for breaking a full face of rock for... Method and apparatus for breaking a full face of rock for...

E - Fixed Constructions

21

D

E21D 1/00 (2006.01) E21B 15/04 (2006.01) E21B 19/084 (2006.01) F42B 3/04 (2006.01) F42D 3/04 (2006.01)

Patent

CA 2064625

A method for breaking a longer round more efficiently in a full face of rock, to construct shafts or tunnels. In the method a relief hole having at least a 200 mm diameter and at least a 15 to 18 foot depth is drilled. Primary and secondary blast holes are drilled about the relief hole, approximately axially parallel to the relief hole. Most of the blast holes are drilled simultaneously with the relief hole. The relief hole is drilled by an in-the-hole (ITH) hammer drill, which if necessary is removed after drilling the relief hole, to allow blast holes to be drilled immediately adjacent the relief hole. The relief hole is drilled at least 10 to 15 percent deeper than the blast holes. Explosive charges are then inserted into the relief hole and most of the blast holes and are detonated in sequence. The simulta- neous drilling of the relief and blast holes, and the use of the large relief hole, enable a greater advance per round and make the process highly time efficient, while at the same time requiring less skill than was previously needed. This increases productivity and lowers cost.

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