| 摘要 |
<p>A system for boring a hole in the ground comprises an excavating machine (12,72,116) provided with a tubular body (16,74,128), excavating means (48) supported by the body so as to excavate the ground, means (44) for shifting the excavated substances to the periphery of the body and driving means (36,120) for operating the excavating means.</p> |
