反循环钻孔桩特性与工程应用

Characteristics and Application of Reverse Circulation Pile Hole

反循环钻孔桩是一种技术性能比较优越的非挤土型桩，其承载力比正循环钻孔桩平均提高10％—20％，特别在软土地层，桩的质量和技术经济指标优于正循环钻孔桩。介绍了反循环钻孔桩的工艺技术特点、技术质量指标、承载力、施工技术要点及该公司施工的部分工程情况。

: Reverse circulation borehole pile is a non-squeezing pile. Its bearing capacity is 10-20 per cent higher than that drilled with positive circulation drilling technique, especially in soft soil formation, the quality of the pile is superior to the piles drilled by positive circulation method in technical and geo-economical benefits. This paper introduces the characteristics of techniques, quality index, bearing capacity and the important points in operation of reverse circulation borehole pile as well as the case history.