具有多种选择功能：手动操作功能、单钻孔循环等功能。
Multi selection is available: manual operation function, single-pin cycle, single - drill cycle functions, etc.
贯通式潜孔锤反循环钻进技术是一种先进的钻探方法，适用于复杂地层中的地质勘探以及各类钻孔工程。
The hollow-through DTH hammer drilling techniques with whole hole reverse circulation is adopted, it is proved that this technique can resolve drilling.
结合浙江省仙居县地税大楼基础的设计方案，介绍了正循环钻孔灌注桩基础的设计。
According to the design plan of the foundation of Dishui building in Xianju county of Zhejiang province, this paper introduces the foundation design of positive circulating boring piles.
泥浆的主要功用之一是通过自身的循环，有效地清除钻孔内破碎下来的岩屑，特别是对于水平孔，可以避免砂床的形成，减少钻孔内的事故。
Drilling mud can clean out the cuttings by its circulation, especially for horizontal hole, it can avoid the sand-bed formation and reduce downhole troubles.
泵吸反循环钻孔扩底灌注桩与人工挖孔灌注桩相比，地质条件的适应性强，施工安全可靠。
Compared to artificial digging-hole pile, the pumping reverse-circulation under-reamed bored pile has higher adaptability to geological condition, and its construction is safety and reliability.
泵吸反循环钻孔扩底灌注桩与人工挖孔灌注桩相比，地质条件的适应性强，施工安全可靠。
Compared to artificial digging-hole pile, the pumping reverse-circulation under-reamed bored pile has higher adaptability to geological condition, and its construction is safety and reliability.
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