Wirth Maschinen-und Bohrgerate-fabrik Gmbh

Georg Hurtz

Willi Steufmehl

Heinz P Vogts

Wolfgang Krappen

Method and apparatus for modifying the cross-sectional profile of an

A method of and apparatus for sinking essentially vertical bores, in particular large-hole bores, shafts or the like, the bore direction being pre-determined for a bore head or the like, rotatable by means of a set of bore rods, using a device which may be fixed with respect to the borehole wall after a bore section has been bored, wherein the device is released, the bore head is moved in a stationary state into a position suspended on the bore rods and then the direction is determined for the next bore section, the diameter of the bore head for determining the direction of the next bore section being changed from a relatively larger to a relatively smaller size.

Method for sinking boreholes

Producing a vertical or inclined drill hole by full profile drilling taking place upwardly from a starting location and utilizing a rotatable and displaceable drilling tool and a train of drilling rods which lead to the drilling tool, wherein the drilling tool is, together with the train of drilling rods, subjected, in the vicinity of the upper end of the train of drilling rods, to a force applied in the feed direction, at least part of the reaction of this force being transmitted to a counterabutment which can be releasably secured in the drill hole, and the driving torque for the drilling tool being produced at the starting location and mechanically led from there to the drilling tool.

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Erkelenz, Germany

Georg Hurtz