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通过CFG桩完整性检测,一部分桩浅部存在缺陷,其特点为反射波曲线周期大,无柱底反射信号,缺陷性质为水平断裂,按验标规范自检10%频率,前期检测900根,浅部断裂50根,占检测总数的5.6%,断裂的位置为从桩顶往下50～80 cm,另完整性检测过程中发现部分桩帽与桩不能有效连结成为一整体,以上2种情况严重影响桩身质量。在进行单桩承载力试验分级加载接近到设计荷载时桩头破损,影响正常试验,不能反映单桩承载力的真实性。为确保CFG桩质量完整性及单桩承载力试验结果的正确性,应在施工或试验过程中引起高度重视,做到预防为主,从而制定一些施工措施及方法。
Through the CFG pile integrity testing, some of the pile shallow defects, which is characterized by large reflection wave cycle, no column-bottom reflection signal, the defect nature of the horizontal fracture, according to the inspection standard self-test frequency of 10%, pre-test 900, There are 50 shallow faults, accounting for 5.6% of the total number of faults. The fracture location is 50 ~ 80 cm down from the top of the pile. During the integrity testing, some pile caps and piles can not be effectively connected to form a whole. In the above two cases Seriously affect the quality of the pile. In the single pile bearing capacity test graded loading close to the design load of the pile head damage, affecting the normal test, can not reflect the authenticity of single pile bearing capacity. In order to ensure the integrity of the CFG pile and the correctness of the test results of the pile bearing capacity, great attention should be paid in the process of construction or testing so as to prevent it. Therefore, some construction measures and methods are formulated.