磁测井法在基桩检测中的应用及影响因素分析

Application of Magnetic Logging Method in Foundation Pile Detection and Analysis of Influencing Factors

通过磁感应设备探测基桩测孔周围较大空间内钢筋笼磁性体引起的磁场变化,研究基桩测孔附近钢筋笼磁性体周围形成磁场强度变化的空间分布特征规律,探测钢筋笼磁性体产状和规模,进而能分析判断出灌注桩的钢筋笼长度或管桩桩长,并结合工程实例与有效测试数据分析的灌注桩钢筋笼长和管桩桩长及接桩位置进行对比,验证了磁测井法测试灌注桩钢筋笼长度和预制桩桩长的可靠性。通过对比我国现有相关规范,给出磁测井法检测时相关参数选取的建议。

Through the magnetic induction equipment to detect the magnetic field change caused by the magnetic body of the steel cage in a large space around the measuring hole of the foundation pile,the spatial distribution characteristics of the magnetic field intensity change around the magnetic body of the steel cage near the measuring hole of the foundation pile are studied,and the occurrence and scale of the magnetic body of the steel cage are detected,and then the length of the steel cage of the cast⁃in⁃place pile or the length of the pipe pile can be analyzed and judged.Combined with the engineering example and the effective test data,the length of the steel cage of the cast⁃in⁃place pile and the length of the pipe pile and the position of the pile are compared,and the reliability of the magnetic logging method to test the length of the steel cage of the cast⁃in⁃place pile and the length of the prefabricated pile is verified.By comparing the existing relevant specifications in China,some suggestions on the selection of relevant parameters in magnetic logging detection are given.