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由于混凝土箱梁底板缺陷检测手段的制约,使得缺陷处治方案长期以来具有一定的主观性、经验性以及盲目性,因此将地质雷达无损检测技术应用混凝土箱梁底板缺陷检测具有重要的意义。文章研究了地质雷达的工作原理以及波相识别方法,然后在某混凝土连续箱梁桥应用该地质雷达无损检测技术,以确定其混凝土的密实性、脱空区域、底板厚度以及预应力管道位置等,钻芯取样方法验证了地质雷达无损检测技术在混凝土箱梁底板缺陷检测中的有效性和可行性。
Due to the limitation of detection methods of floor defects in concrete box girders, the defect treatment programs have long been subjective, empirical and blind. Therefore, it is of great significance to apply the non-destructive testing technique of GPR to the detection of floor defects of concrete box girders. In this paper, the working principle of GPR and the identification method of wave-facies are studied. The GPR non-destructive testing technique is applied to a concrete continuous box girder bridge to determine its concrete density, void area, floor thickness and prestressed pipeline location , Core sampling method validates the effectiveness and feasibility of GPR NDT technology in the detection of concrete box girder floor defects.