Application of residual pile length detection method in shield or pipe-jacking area
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摘要: 受复杂场地条件及物探方法局限性影响，在城区盾构隧道或顶管管道影响范围内，残留基桩桩长的适用探测方法有限。实践和研究表明，对于混凝土桩（配筋），采用井中磁梯度法并辅以低应变弹性波法印证，效果较好；对于钢管桩或钢板桩，采用井中磁梯度法效果良好。井中磁梯度法探测桩长具有精度高、速度快、环境适应性强等特点，采用常规成孔方式易损坏地下管线，提出采用新型塑料钻头的钻进工艺，能较好地解决地下管线密集区难成孔的问题，为该方法探测基桩桩长奠定基础。Abstract: Affected by the complex site conditions and the limitations of geophysical prospecting methods, the applicable detection methods for the length of residual foundation piles are limited within the influence range of shield tunnels or pipe-jacking pipelines in urban areas. Practice and research have proved that for concrete piles (reinforcement), the borehole magnetic gradient method combined with the low-strain elastic wave method is effective; For steel pipe piles or steel sheet piles, the effect of the borehole magnetic gradient method is good. The borehole magnetic gradient method has the characteristics of high precision, fast speed, and strong environmental adaptability. It is easy to damage the underground pipeline by using the conventional drilling method. The drilling technology using a new type of plastic drill bit is proposed, which can better solve the problem of difficult hole formation in the dense area of underground pipeline, and provide references for detecting the pile length of foundation pile by this method.
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