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以都江堰白沙大桥为例,对该桥上、下部结构的几何偏位进行了量测,采用低应变反射波法对其桩基完整性进行检测,并以现场挖深验证桩基检测结果的准确性;对该桥上部结构进行了全桥结构安全验算复核,针对该桥下部结构是否满足新的抗震标准,对其进行抗震验算;最后,根据检测及验算结果,提出了相应的加固修复措施。研究结果表明:对于成桥桩基础检测,采用低应变反射波法及小波处理等技术可有效地判别桩基础的缺陷及状况。该桥上部结构各项验算指标均满足规范要求,墩柱、桩基均满足新的抗震设防标准,并为其加固修复提供了理论依据。
Taking Baisha Bridge in Dujiangyan as an example, the geometrical deviation of the upper and lower substructures of the bridge was measured, and the integrity of pile foundations was measured by low strain reflection wave method. The accuracy of pile foundation test was verified by field digging depth The structure of the superstructure of the bridge is verified by checking the safety of the full-bridge structure. Finally, according to the results of detection and verification, the corresponding reinforcement measures are proposed. The results show that: for the detection of bridge pile foundation, the technique of low-strain reflection wave method and wavelet processing can effectively judge the defect and condition of pile foundation. All the checking indexes of the superstructure of the bridge meet the requirements of the code. The pier and pile foundation all meet the new standards for seismic fortification and provide a theoretical basis for their reinforcement and repair.