凹凸型钻孔灌注桩施工技术
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引用本文：秦宗付.凹凸型钻孔灌注桩施工技术[J].钻探工程,1996,(6):30-31,41.
. Concave-convex Type Bored Pile Drilling Technique[J]. Drilling Engineering, 1996,(6):30-31,41.
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秦宗付
安徽省煤田地质局第二勘探队
中文摘要:在砂层摩阻力不够的情况下，采用凹凸型钻孔灌注桩施工提高单桩承载力，获得成功。介绍了凹凸型钻孔灌注桩的设计、施工方法及应用效果。
中文关键词:凹凸型钻孔灌注桩，高速、控压造凹凸法，打点法
 
Concave-convex Type Bored Pile Drilling Technique
Qin Zongfu
Abstract:In the case of insufficient friction resistance in sandy formation,the single pile bearing capacity is successfully increased by forming a concaveconvex type bored pile. The design,construction andresults of the concave-convex bored pile are described.
keywords:Concave-convex bored pile concave-convex forming with controlled bit weight at high rotary speed marking method,
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