Dry pneumatic system for hard rock shaft drilling

Details Dry pneumatic system for hard rock shaft drilling Dry pneumatic system for hard rock shaft drilling

E - Fixed Constructions

21

B

255/73

E21B 4/02 (2006.01) E21B 17/10 (2006.01) E21B 17/16 (2006.01) E21B 17/18 (2006.01) E21B 21/12 (2006.01) E21B 21/16 (2006.01)

Patent

CA 2007070

A dry, vertical shaft drilling system including an inverted raiseboring cutterhead fitted with air nozzles and vacuum pickups. Weights are detachably stacked above the cutterhead. Cuttings are extracted through the weights into a swivel circumscribing the drill string. The swivel is a transition from the rotating cutterhead to the stationary extraction riser pipes disposed above the swivel. Non-rotating stabilizers stabilize the drill string.

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