Method and apparatus for sinking shafts

Details Method and apparatus for sinking shafts Method and apparatus for sinking shafts

1978-11-13

1980-10-14

Novosad, Stephen J.

Boring or penetrating the earth

Processes

Boring with specific fluid

175171, E21B 302, E21B 1700, E21D 106, E21D 108

Patent

active

042275830

ABSTRACT:
Disclosed is a method and apparatus for sinking shafts in which ring-like walling elements used as a shaft shoring are inserted into the shaft concurrently with the drilling thereof. The walling elements are held against rotation by a mechanism at the top of the shaft which sequentially inserts the walling elements into the shaft as dictated by the depth thereof as drilling progresses. The lowermost end of the lowermost walling element is supported on a bearing associated with the shaft drill bit.

REFERENCES:
patent: 2641444 (1953-06-01), Moon
patent: 2675213 (1954-04-01), Poole et al.
patent: 3115755 (1963-12-01), Siebenhausen
patent: 3389560 (1968-06-01), Zemsky
patent: 3901331 (1975-08-01), Djurovic
patent: 4055224 (1977-10-01), Wallers

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