Method for drilling hard material

Details Method for drilling hard material Method for drilling hard material

E - Fixed Constructions

21

B

255/79

E21B 3/00 (2006.01) E21B 3/02 (2006.01) E21B 4/16 (2006.01) E21B 6/00 (2006.01) E21B 7/28 (2006.01) E21B 10/04 (2006.01) E21D 9/10 (2006.01)

Patent

CA 1133954

ABSTRACT OF THE DISCLOSURE A method for drilling hard material such as rock by fragmenting the rock by impact in selected spaced-apart areas and simultaneously fragmenting the rock by shear between the selected areas. The invention also covers a drill head with particularly arranged impact hammers for carrying out the method, and a drill unit incorporating the drill head.

367024

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