| 摘要 |
The invention relates to a drilling apparatus (10), comprising a drive device (14) and a comminution tool (16) driven by the drive device (14). The drilling apparatus (10) digs autonomously and in an advancing manner by means of comminuting work of the comminution tool (16) and the force of gravity applied to the drilling apparatus (10) into the borehole (12) and is powered by electricity. |
