ZZ-6A冲击式钻机通过中空阶梯钻头冲击钻进和捞渣桶排渣实现高效成孔,但在成桩时较为笨重并伴有桩底沉渣过厚的缺陷；简易式冲击钻机的管式钻头集掘进排渣于一体,能有效减少桩底沉渣,但又有成孔时间过长的弊端,将两种冲击钻机组合,分别实现桩孔的成孔和成桩工序,应用于砂卵石地层群桩基础施工,提高施工效率的同时也有效减少了桩底沉渣.%ZZ-6A hammer drill uses hollow multiple-diameter drill for percussive drilling and bucket grab for slag discharge to realize high hole -forming efficiency, but pile forming course is complex and slag deposition at pile bottom is over thick; although the tubular drill of simplified hammer drill integrating excavation and slag discharge could reduce slag deposition at pile bottom, it spends over long time for hole forming. Therefore, the two hammer drills are combined together to realize hole -forming and pile -orming sequence and to be used in construction of group pile foundation on sand and pebble stratum. In this way, not only construction efficiency is improved, but also slag deposition at pile bottom is obviously reduced.
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