PE管道由于其施工方便、工程造價比用鋼管低（DN300以下）、不存在腐蝕泄露問題、對輸送物質污染小等優點，近年來在城市埋地燃氣輸送管網建設中被廣泛應用。PE管道雖然有很多優點，但強度低是其非常大的弱點，在以往市政建設施工中，由于管道的確切位置不十分清楚，被施工機械挖斷、挖漏的現象很常見，而由此造成的燃氣爆炸事故也時有發生；此外，由于非開挖技術的應用，產生了各種類型的深埋管線，這就更加深了探測管線的難度。

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燃氣管道埋入地下時，為了以后不用開挖探測定位PE管道的位置和埋深，按照《城鎮燃氣設計規范》GB50028—2006和《城鎮燃氣輸配工程施工及驗收規范》CJJ33-2005要求，需要隨同埋地PE管道一起鋪設一條金屬導線——即示蹤線。示蹤線是金屬絲經防腐處理后經過編織工藝成一種能導電的金屬線，一般用于埋設較深的場合，緊貼管材敷設，將示蹤線的一頭接上脈沖信號就能在地面上遙測到信號，可確定管道的空間位置和深度及走向。

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.

一般情況下示蹤線敷設在管道外面，但在非開挖施工敷設PE管道時（定向鉆穿越施工），管道外面的示蹤線大多數情況下會被拉斷，不能夠再用于施加信號探測管道的位置和埋深，而失去示蹤線作用。

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.

現有技術中，埋地PE管道內部金屬示蹤線的引出，主要使用管道的鋼塑轉換接頭，沒有設計鋼塑轉換接頭的位置還不能夠引出金屬示蹤線，造成埋地PE管道示蹤線出現斷點、不完整等現象，給后面的管道探測與定位帶來難題。

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.