地埋示蹤線系統(tǒng)，其原理主要是依靠并行管敷設(shè)的金屬線，利用電流穿過金屬線產(chǎn)生的磁場變化，定位金屬示蹤線的位置，進而推測PE管的位置。

The principle of the buried trace line system is mainly to locate the position of the metal trace line and speculate the position of the PE pipe by relying on the metal line laid in parallel pipes and the magnetic field change generated by the current passing through the metal line.

這種系統(tǒng)的優(yōu)點是產(chǎn)品較為成熟，國內(nèi)利用經(jīng)驗多，施工方法簡單，工人易于操作，與原有的銅制鋼管系統(tǒng)示蹤方法的檢測差距不大，與現(xiàn)有系統(tǒng)易整合。

The advantages of this system are that the product is relatively mature, the domestic use experience is much, the construction method is simple, the workers are easy to operate, the detection gap with the original copper steel pipe system tracing method is small, and it is easy to integrate with the existing system.

示蹤線的形式與性能：

Form and performance of trace line:

1、鋼絲塑料薄膜示蹤線，是一種由鋼線或其他金屬絲與PE塑料薄膜壓制而成，經(jīng)常與警示帶整合使用，鋼絲直徑在0.5mm?左右。

1. Steel wire plastic film tracing line is a kind of steel wire or other metal wire pressed with PE plastic film, which is often used in combination with warning tape. The diameter of steel wire is 0.5mm? about.

性能：由鋼絲為導體，由于橫截面積小造成不易連接，電阻大，探測距離有限只有十幾米到幾十米，實際施工中易斷裂，電氣有效連通性易被破壞，難以滿足實際需要。

Performance: The steel wire is the conductor, which is difficult to connect due to its small cross-sectional area. The resistance is large, and the detection distance is limited to only tens to tens of meters. It is easy to break in actual construction, and the effective electrical connectivity is easy to be damaged, which is difficult to meet the actual needs.

2、電線示蹤線，利用銅制或鋁制電線纜為示蹤線，截面積多采用2.5-4mm?。

2. The copper or aluminum wire and cable are used as the trace wire of the electric wire, and the sectional area is usually 2.5-4mm?.

性能：由于采用電線或電纜，其檢測距離遠、效果好，但造價相對昂貴。電線的外表面絕緣層是PVC，這種材料麥迪后易老化，相對PE材質(zhì)有所不足，電線金屬芯多是銅或鋁材質(zhì)，抗拉有局限性，在用于常規(guī)鋪設(shè)及非開挖鋪設(shè)時，斷裂幾率較高。

Performance: Due to the use of wires or cables, the detection distance is far and the effect is good, but the cost is relatively expensive. The insulation layer on the outer surface of the wire is PVC, which is easy to age after being made of McGrady. Compared with the PE material, it is insufficient. The metal core of the wire is mostly made of copper or aluminum, and its tensile strength is limited. When it is used for conventional laying and trenchless laying, the fracture probability is high.

3、專用金屬示蹤線，是由專用金屬線芯（銅包鋼）和PE外保護層組成，截面積多采用205-7mm?。

3. The special metal tracer wire is composed of special metal core (copper clad steel) and PE outer protective layer, with a sectional area of 205-7mm?.

性能：金屬示蹤線，采用PE作為外保護層，絕緣、防腐、防水、抗老化，芯層中的銅層適當增強導電性，提高電信號，通信科有效增加增強線體強度，導電性稍差但強度和力學性能好。在歐美金屬示蹤線應(yīng)用了多年，具有較好的經(jīng)濟效應(yīng)。

Performance: The metal tracer wire uses PE as the external protective layer, which is insulated, anti-corrosion, waterproof and anti-aging. The copper layer in the core layer properly enhances the conductivity and improves the electrical signal. The communication department effectively increases the strength of the wire body. The conductivity is slightly poor, but the strength and mechanical properties are good. It has been used in Europe and America for many years and has good economic effect.

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