管桩施工点位地下管线定位技术

Positioning Method for Underground Pipeline at Pipe Pile Construction Location

地下管道是现代城市的“生命线”,当在其上方设计另一座建筑物或道路并进行地基处理时,准确定位其空间位置十分重要。然而,现有的非开挖探测方法由于测量深度有限且测量范围较小,不适用于深部的地下管道。通过理论计算和现场试验,研发了一种新的深埋地下管道探测方法———地-井电磁感应法。该方法使用与水平面成一定角度的线圈来接收目标管道的磁通量,然后进行2D分析,以计算最大磁通量深度与管道位置之间的关系。地-井电磁感应法已应用于实际的现场调查中,检测到的管道位置与工程钻探结果一致。

Underground pipeline is the‘lifeline’of a modern city and the accurate positioning of its spatial location has become extremely important when another building or road is designed above it.However,the existing trenchless detection methods are not suitable for the deep underground pipeline due to limited measuring depth and small range.In this paper,a new method(called Surface-to-Borehole Electromagnetic Induction Method)of deep buried underground pipeline detection has been studied by theoretical calculation and field test.In this new method,a coil at an angle to the horizontal level has been used to receive the target pipe's magnetic flux.Then a 2D analysis has been performed to calculate the relationship between the depth of the maximum magnetic flux and the pipeline location.The method has been applied in a practical fieldwork.The pipeline position detected by the new method is consistent with that from engineering drilling.