特殊地层下人工挖孔桩施工方法

Construction Method of Manually--Drilled Pile in Special Stratum

人工挖孔桩穿过特殊地层时，往往是施工难度增大，工程进度受到影响，甚至会产生安全隐患，故而结合工程实例，分析了桩基施工过程中所出现的问题，提出了具体施工处理方法．工程实践证明，合理混合使用人工挖孔桩和冲击成孔灌注桩两种施工方法，缩短了工期，减少了基础的工程费用．

When carrying out manually--drilling of pile holes, special stratum usually exerts an obstacle to construction, which will slow down the construction progress and even cause some potential dangers. Combined with example analysis of practical construction, this paper is to analyze the problems occurred in the construction process of pile foundation, and work out concrete solutions to practical construction. It has been proven through practice that the alternate use of the technique of both manually--drilling and percussion drilling is effective in shortening the construction process and saving construction cost on foundation.