Drilling apparatus and method for its control

Details Drilling apparatus and method for its control Drilling apparatus and method for its control

E - Fixed Constructions

21

D

E21D 9/06 (2006.01) E21B 7/06 (2006.01) E21B 7/20 (2006.01) E21D 9/10 (2006.01)

Patent

CA 2066168

2066168 9105140 PCTABS00004 A method provided with one working tool for control of drilling apparatus in driving a tunnel in rock, wherein the control is effected through exploitation of the force of gravity with respect to a line determined by two supporting points P2 and P3 of a protecting tube and these points being supported against the tunnel bottom.

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