| 摘要 |
<p>A process and a tool for ground drilling. The tool comprises an envelope (6) stiffened by a beam (10) ensuring the coupling with a driving system (2) and ended by an opening door (28). The envelope determines an inner volume for storing the excavated material. Lateral cutters (50) associated to openings provided with a trap (53) ensure the progress of the excavation. The envelope (6) is provided with a helix allowing to control the circulation of liquids in the space contrived between the envelope (6) and the drilling. The invention applies, particularly, to drilling tools in the presence of liquids. </p> |
