Method and a machine for advancing an underground face of a...

Details Method and a machine for advancing an underground face of a... Method and a machine for advancing an underground face of a...

E - Fixed Constructions

21

D

255/36, 262/6

E21D 9/00 (2006.01) E21B 7/02 (2006.01) E21D 9/10 (2006.01)

Patent

CA 1039759

TITLE A METHOD AND A MACHINE FOR ADVANCING AN UNDERGROUND FACE OF A GEOLOGICAL FORMATION ABSTRACT OF THE DISCLOSURE A method for driving tunnels in rounds is disclosed in which, after each round, the tunnel is left with an inclined transition to the floor. In the subsequent round, a cut is opened up in the transi- tion towards the floor and the tunnel face is then stepwise drilled and blasted in cycles until the roof is reached and the round is completed. A machine for carrying out the method is disclosed which comprises a plurality of drill-and-blast units that are mounted on a frame that is pivotable about a transverse horizontal axis.

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