PE管道由于其施工方便、工程造价比用钢管低（DN300以下）、不存在腐蚀泄露问题、对输送物质污染小等优点，近年来在城市埋地燃气输送管网建设中被广泛应用。PE管道虽然有很多优点，但强度低是其的弱点，在以往市政建设施工中，由于管道的确切位置不十分清楚，被施工机械挖断、挖漏的现象很常见，而由此造成的燃气爆炸事故也时有发生；此外，由于非开挖技术的应用，产生了各种类型的深埋管线，这就更加深了探测管线的难度。

PE pipelines have been widely used in the construction of urban buried gas transmission networks in recent years due to their advantages such as easy construction, lower engineering cost compared to steel pipes (below DN300), no corrosion and leakage problems, and low pollution to transported materials. Although PE pipelines have many advantages, their biggest weakness is their low strength. In previous municipal construction, the exact location of the pipeline was not very clear, and it was common for construction machinery to cut and leak, resulting in gas explosion accidents from time to time; In addition, due to the application of non excavation technology, various types of deep buried pipelines have emerged, which further increases the difficulty of detecting pipelines.

目前埋地PE燃气管道埋入地下时，为了以后不用开挖探测定位PE管道的位置和埋深，按照《城镇燃气设计规范》GB50028—2006和《城镇燃气输配工程施工及验收规范》CJJ33-2005要求，需要随同埋地PE管道一起铺设一条金属导线——即示踪线。示踪线是金属丝经防腐处理后经过编织工艺成一种能导电的金属线，一般用于埋设较深的场合，紧贴管材敷设，将示踪线的一头接上脉冲信号就能在地面上遥测到信号，可确定管道的空间位置和深度及走向。

At present, when buried PE gas pipelines are buried underground, in order to avoid excavation detection and locate the position and depth of the PE pipeline in the future, according to the requirements of the "Urban Gas Design Code" GB50028-2006 and the "Construction and Acceptance Code for Urban Gas Transmission and Distribution Engineering" CJJ33-2005, a metal wire, namely a tracer line, needs to be laid together with the buried PE pipeline. Tracer wire is a type of conductive metal wire woven from anti-corrosion treatment of metal wire. It is generally used in deep buried situations, closely attached to the pipe for laying. By connecting one end of the tracer wire to a pulse signal, the signal can be telemetry on the ground to determine the spatial position, depth, and direction of the pipeline.

一般情况下示踪线敷设在管道外面，但在非开挖施工敷设PE管道时（定向钻穿越施工），管道外面的示踪线大多数情况下会被拉断，不能够再用于施加信号探测管道的位置和埋深，而失去示踪线作用。

In general, the tracer line is laid outside the pipeline, but during non excavation construction of PE pipelines (directional drilling crossing construction), the tracer line outside the pipeline is mostly pulled and cannot be used to apply signals to detect the position and depth of the pipeline, thus losing its function as a tracer line.

现有技术中，埋地PE管道内部金属示踪线的引出，主要使用管道的钢塑转换接头，没有设计钢塑转换接头的位置还不能够引出金属示踪线，造成埋地PE管道示踪线出现断点、不完整等现象，给后面的管道探测与定位带来难题。

In the existing technology, the introduction of metal tracing lines inside buried PE pipelines mainly uses steel plastic conversion joints of the pipeline. Without the design of steel plastic conversion joints, it is not possible to introduce metal tracing lines, resulting in phenomena such as breakpoints and incompleteness of the tracing lines in buried PE pipelines, which poses difficulties for pipeline detection and positioning in the future.