| 摘要 |
<p>Apparatus for driving casing or conductor pipe into the ground include a casing or conductor pipe adapted to be driven into the ground and having an internally disposed support shoulder. A reciprocal impact driver is supported atop the casing or conductor pipe for applying percussive force thereto, and a drill string assembly is supported upon the support shoulder within the casing or conductor pipe for drilling a hole at the bottom portion thereof. A drill bit is connected to the drill string assembly, and a fluid driven drill is releasably connected to the drilling string assembly for imparting rotary motion thereto. Means are associated with the drill string assembly for creating a fluid pressure differential between the interior and the exterior of the drill string to evacuate drilling debris and cuttings from the drilled hole. The driver and drill are operative simultaneously or sequentially.</p> |
