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

1990-12-24

1993-04-06

Dang, Hoang C.

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

With suction pump inlet communicating with bore bottom

175215, 175324, 1753253, E21B 2102, E21B 2112

Patent

active

051995158

ABSTRACT:
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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J. Powell and K. Ruby, "Pneumatic Conveyor Equipment Applied to Mine Shaft Sinking", Trans. Instn Min. Metall. (Section A:Min. Industry), 90, Apr. 1981 (excerpt pp. A69 and A70).

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