Method and apparatus for sinking shafts
Patent
·
OSTI ID:6569763
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.
- Assignee:
- Wirth Maschinen und Bohrgerate Fabrik (Germany, Federal Republic Of)
- Patent Number(s):
- US 4227583
- OSTI ID:
- 6569763
- Country of Publication:
- United States
- Language:
- English
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