桩基中钢筋笼长度无损检测技术模型实验及认识

Model Experiments on the Length of Reinforcement Cage in Cast-in-Situ Pile Using Trenchless Technology

针对桩基中钢筋笼长度检测难的问题,探索一种能定量或半定量检测桩体中钢筋笼的长度、且不需要进行破坏性开挖的无损检测技术。其思路是将桩基中的钢筋笼等效为电极,根据电极埋入的长短不同,在地表所测量到的电位、电感、电容等电性参数的差异来分析判断电极的长度。根据理论模型设计并完成了水槽模型实验和桩基模型实验。同时对实验数据进行了分析,初步探讨了此方法的可行性并指出了进一步研究的方向。

Because it is difficult to test the length of reinforcing cage structure in cast-in-situ pile . This paper seeks to explore a quantitative or semi-quantitative technology for detection of the length of reinforcing cage structure in cast-in-situ pile by using the electric exploration method, which is not required to destroy the cast-in-situ pile and the earth around it. The reinforcing cage structure can be regarded as a long electric pile, when the length of the reinforcing cage structure embedded in the foundation is different, the pa rameters such as： potential, inductance, capacitance which detected on the surface will be different and based on these differences, we can analyze and judge the length of reinforcing cage. According to the theoretical model, the flume model is designed and completed and the pile model is tested. Analyzing the results of the experiment data, the feasibility of the method is discussed preliminarily and the future research is pointed out.