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1 概况 随着高层建筑的大量兴建,基础问题越来越引起了重视,其中对灌注桩的动测研究,取得了长足进展。由于静载荷试验固有的特点,对于质量离散度较大的钻孔灌注桩,抽取总桩数的1％～3％进行静载荷试验,不足以代表整个工程的质量,因此,至80年代后期各种动测方法在上海地区有了较大的发展。就检测方法而论可以分为高应变检测和低应变检测两大类,每一类又可分为若干种,少数重要工程还采用了超声波埋管检测桩身质量的方法;就检测单位
1 Overview With the large-scale construction of high-rise buildings, more and more attention has been paid to the basic issues. Among them, the dynamic test of cast-in-place piles has made considerable progress. Due to the inherent characteristics of the static load test, for the bored cast-in-place piles with large mass dispersion, the static load test performed for 1% to 3% of the total number of piles is not sufficient to represent the quality of the entire project. Therefore, it was not until the late 1980s. This kind of motion measurement method has made great progress in Shanghai. In terms of detection methods, it can be divided into two categories: high-strain detection and low-strain detection. Each type can be divided into several types. A few important projects also adopt the method of detecting the quality of the pile by using ultrasonic buried pipes;