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US 4,379,594 AGranted
Process for sinking of shafts
AssigneeVoest-Alpine Aktiengesellschaft
InventorsAlfred Zitz, Otto Schetina, Herwig Wrulich, Arnulf Kissich
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AssigneeVoest-Alpine Aktiengesellschaft
InventorsAlfred Zitz, Otto Schetina, Herwig Wrulich, Arnulf Kissich
Estimating the term…
For sinking of shafts, a cutting machine (1) is provided having its cutting arm (3) pivotable around a vertical axis (4) and a horizontal axis (5). The cutting arm (3) carries cutting heads (14) which are rotatable around an axis (15) horizontally arranged and extending perpendicularly relative to the axis of the cutting arm. The shaft is now sunk around its circumference (9) in direction of its axis (10), for which purpose first the uppermost lead of a screw surface is prepared. On this uppermost lead of the screw surface the cutting machine is advanced until the cutting heads (14) contact the shaft wall (9). In the following, a floor cut (19) is made whereupon a further floor cut (20) is made at a lower level. Starting from a corresponding position of the cutting machine surfaces (23, 24) are cut free starting from the shaft wall (9). 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 (30) 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 (FIG. 2).
Process for sinking of shafts into the earth by means of a partial-cut cutting tool, characterized in that the shaft is sunk by means of a partial-cut cutting machine, having an universally pivotable cutting arm carrying at least one cutting head and having a chassis fitted with crawler tracks, along a screw surface in the earth having its axis coinciding with the shaft to be sunk, the cutting machine being moved on said screw surface.
A process for sinking a shaft having a generally circular wall into the earth by means of a self-propelled partial-cutting machine which has a universally pivotable cutting arm carrying at its outer end at least one cutting head which is rotatable about a horizontal axis, said process comprising locating the machine within the circumference of the shaft to be sunk in a position such that the cutting head is engageable with said circumference and such that the longitudinal axis of the machine makes an acute angle with the tangent at the contact point between the cutting head and said circumference, swinging the cutting arm in an arc about a vertical axis to thereby cut an arcuate section which extends from said circumference to a point close to the axis of the shaft to be sunk, self-propelling the machine downwardly along a helical path concentric to the axis of the shaft and continuing to cut additional arcuate sections by swinging movement of the cutting head thus increasing the depth of the shaft.
Dependencies are inferred from the claim text.