冲击旋转钻进
percussive rotary drilling
冲击旋转钻井
percussive-rotary drilling
旋转冲击钻井
rotary percussion drilling
回转冲击式钻车
rotary-percussion drill jumbo
冲击式钻机
percussion type boring machine
impact drill
percussion drill
短螺旋钻机钻孔成桩工艺
Drilling-into-pile techniques by the Short Spiral Drill
加强型旋转式机械熔接
enhanced rotary mechanical splice
enhanced rotray mechanical
Splice