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一、引言 钻孔灌注桩已成为我国公路桥梁和工业与民用建筑楼房基础工程的主要形式之一。但钻孔灌注桩在施工过程中容易发生各种缺陷,使桩基础不能满足设计的荷载要求。据国外统计,钻孔桩的损坏率为5～10％。国内初步统计为2～21％。因此对工程桩实施无破损质量的检测,可有效地监督施工质量。并为工程监理和设计人员提供可靠的依据,这是十分重要的。
I. INTRODUCTION Bored cast-in-place piles have become one of the main forms of basic engineering for highway bridges and industrial and civil buildings in China. However, bored piles are prone to various defects in the construction process, so that the pile foundation cannot meet the design load requirements. According to statistics from abroad, the damage rate of bored piles is 5 to 10%. The preliminary domestic statistics are 2 to 21%. Therefore, the inspection of the construction pile without damage quality can effectively supervise the construction quality. It is very important to provide reliable basis for engineering supervision and design personnel.