| 摘要 |
The invention relates to an earth drilling device having a rotary drive and a drilling head connected to the rotary drive via a shaft. The invention is distinguished in that the shaft runs at least partially axially along a pipe with two pipe ends, the first pipe end of which is connectable to a vacuum source and the second pipe end of which is provided with a pipe opening over which the drilling head at least partially projects, that the drilling head is provided with at least two fillet sections connected to the shaft, which are attached to the shaft in radial extension and in projection to the axis of the pipe only partly cover the pipe opening, that the fillet sections are each connected to an axially oriented surface section whose surface, which is radially oriented outward, contacts the inner wall of the pipe in a gliding manner or contacts an inner wall of a sleeve coaxially connected to the second pipe end when the drilling head rotates, and that the axially oriented surface sections each are connected to a limb which axially projects over the pipe or the sleeve.
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