Process for sinking of shafts

Details Process for sinking of shafts Process for sinking of shafts

E - Fixed Constructions

21

D

262/7

E21D 1/03 (2006.01)

Patent

CA 1163652

ABSTRACT OF THE DISCLOSURE For sinking of shafts, a cutting machine is pro- vided having its cutting arm pivotable around a vertical axis and a horizontal axis. The cutting arm carries cutting heads which are rotatable around a horizontal axis horizontally extending perpendicularly to the axis of the cutting arm. The shaft is sunk around its circumference in the direction of its axis for which the uppermost lead of a screw surface is initially prepared. On this uppermost lead of the screw surface the cutting machine is advanced until the cutting heads contact the shaft wall. Subsequently, a floor cut is made whereupon a further floor cut is made at a lower level. Starting from a corresponding position of the cutting machine, surfaces are cut free starting from the shaft wall. This manner of operation is continued thereby repeating the previous process steps until the whole screw surface is cut free, the cutting machine thereby being moved in backward direction. Any area possibly remaining close to the axis of the shaft and being not within the operating range of the cutting arm can subsequently be broken away or be removed by cutting operating in another position of the cutting machine.

364098

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