| 摘要 |
A drilling apparatus comprises a support structure adapted to be moved on rails to position a drilling assembly mounted thereon adjacent to a selected drilling site. The drilling assembly includes a carriage movably mounted on the support structure for longitudinal movements thereon and a shroud secured on the carriage and having an auger rotatably mounted therein. A cutting edge, having a square configuration, is disposed adjacent to a forward end of the auger and at least one double-acting hydraulic cylinder is interconnected between the support structure and the carriage to aid in pushing the auger and cutting edge through material to form an opening having a square cross section. Upon full extension of the auger and cutting edge, a second drilling assembly may be attached rearwardly on the first-mentioned drilling assembly to increase the overall penetration capabilities of the drilling apparatus.
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