Method for rock-chiseling

Abstract

The invention relates to a method for opening rock with a chisel, especially for producing a drillhole in rock by means of a drilling device that comprises a percussion drive and a rotating thrust rod assembly. The percussion unit, via the drill head, exerts a thrust impulse on the breast in a segment thereof in order to knock out rock from the breast. In a subsequent step, the percussion unit is rotated by an angle α via the rod assembly. Pieces of rock are knocked out from the breast by exerting thrust impulses via the drill head and the drill tip in the corresponding new segment of the breast.

1 . A method for opening stone or rock with a chisel, in particular for producing a drillhole in rock with a drilling device having a percussion drive, a rotary/thrust rod assembly, characterized in that the percussion unit ( 2 ) exerts a percussive pulse on the workface via the drill head ( 4 ) in a circular area section of the workface ( 8 ), in order to break stone out of the workface, and, in a next step, the drill head ( 4 ) is rotated through an angle β and, in the corresponding new circular area section of the workface ( 8 ), again by means of percussive pulses via the drill head ( 4 ) and the chisel point ( 10 ), pieces of stone are broken out of the workface ( 8 ).  
     
     
         2 . The method as claimed in  claim 1 , characterized in that the drill head ( 4 ) is moved back counter to the forward drive direction in order to reach the new circular area section.  
     
     
         3 . The method as claimed in  claim 1  or  2 , characterized in that the percussion unit ( 2 ) is operated at high frequency, preferably at a frequency of more than 1000 impacts/min.  
     
     
         4 . The method as claimed in one of the preceding claims, characterized in that a pressure is exerted on the drilling device, and therefore on the drill head ( 4 ), via the rod assembly ( 6 ).  
     
     
         5 . The method as claimed in  claim 4 , characterized in that the pressure is variable.  
     
     
         6 . The method as claimed in one of the preceding claims, characterized in that the steps of impacting and of rotation are carried out with a cyclic change.  
     
     
         7 . The method as claimed in one of the preceding claims, characterized in that the angle β is 0° to 90°.  
     
     
         8 . The method as claimed in one of  claims 1  to  6 , characterized in that the drill head is rotated via the rod assembly ( 6 ).  
     
     
         9 . The method as claimed in  claim 1 , characterized in that the variation of drilling parameters, such as angle and/or pressure and/or cycle duration, is used in order to achieve a specific drilling direction.  
     
     
         10 . The use of a drilling device having a drill head ( 4 ) with an asymmetric geometry in a method as claimed in one or more of the preceding claims.  
     
     
         11 . The use as claimed in  claim 10 , characterized in that the drill head ( 4 ) has a movable chisel point ( 10 ).  
     
     
         12 . The use as claimed in  claim 10  or  1 , characterized in that the movable chisel point ( 10 ) exerts a percussive pulse on the workface in the steering direction.  
     
     
         13 . The use as claimed in one or more of the preceding claims, characterized in that the chisel point ( 10 ) has an axis at an angle α in relation to the drilling unit, the angle being α=0 to 20°.  
     
     
         14 . The use as claimed in at least one of  claims 8  to  12 , characterized in that the drill head has an asymmetric nozzle arrangement.  
     
     
         15 . A drilling device having a drill head ( 4 ) which has a chisel point ( 10 ), the chisel point ( 10 ) having an axis at an angle α in relation to the drilling unit, characterized in that the angle is α=0 to 20°.