| 摘要 |
<p>In an apparatus for overdrilling buried lines (5) with a driven thrust linkage and/or traction linkage (1), and with a forward end connected to a ring-shaped to hollow cylindrical overdrilling head (4) which embraces the line strand, the overdrilling head (4) is provided interiorly with a centering protrusion (13) for spontaneous centering of the overdrilling head in concert with the line, and is flexible connected to the linkage (1).</p> |
