工程实践证明，这些方法成功地解决了上述条件下弱风化硬岩中大口径钻进的难题。
The engineering practice has proved that these methods solved successfully the problem of great caliber drilling in weakly weathered rigid rock by hydraulic piling rig.
适用于轻型回转钻机钻进软岩、中硬岩、硬岩等各类地层，钻头采用多点破碎，效率较高。
For soft rock, the hard rock, hard rock and other strata, multi-point drill bit broken efficient.
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