Impact Spiral Drilling is a new bore-making techni que.Its usage in the anchorage project of deep foundation ditch can solve the p roblem of drilling in the soft and hard cross stratum.

• 冲击螺旋钻孔是一种新的成孔工艺，在深基坑的锚固技术中成功地解决了软硬互层、夹杂地层的钻进。