1、地埋示蹤線的方法為直連法,它信噪比高、干擾少、易探測,探測結(jié)果比較準確可靠。

1. The method of buried tracer line is direct connection method, which has high signal-to-noise ratio, less interference, easy detection, and accurate and reliable detection results.

2、市區(qū)內(nèi)的PE管道示蹤線不宜選用感應(yīng)法探測。城市區(qū)域內(nèi)的管線密集,而示蹤線相對細小,其接地回路電阻一般情況下比其它管線大很多,因此產(chǎn)生的感應(yīng)電流信號往往要比非目標管線弱很多,示蹤線信號容易被掩蓋而造成誤測。

2. The PE pipeline tracer line in the urban area should not be detected by the induction method. The pipelines in the urban area are dense, while the tracer line is relatively small, and its grounding circuit resistance is generally much larger than that of other pipelines, so the induced current signal generated is often much weaker than that of non-target pipelines, and the tracer line signal is easy to be covered up, resulting in mismeasurement.

3、在探測短分支管道示蹤線時,施加信號點宜選擇分支示蹤線的末端(即測試樁處),這樣分支示蹤線上的信號強,不會漏測分支點。

3. When detecting the trace line of the short branch pipeline, the signal point should be selected at the end of the branch trace line (i.e. at the test pile), so that the signal on the branch trace line is strong and the branch point will not be missed.

4、用直連法地埋示蹤線時,盡量選擇較低的工作頻率,發(fā)射機的接地線也盡量不要跨接其它管線,以減少信號感應(yīng)或串擾到其它管線。

4. When using the direct connection method to bury the tracer line, try to choose a lower working frequency, and try not to cross connect the transmitter's ground wire to other pipelines to reduce signal induction or crosstalk to other pipelines.

5、探測時應(yīng)根據(jù)實際情況,改變供電點位置后再重復(fù)探測,檢查兩次探測結(jié)果的吻合情況,以提高探測的準確性和精度。

5. During detection, the position of power supply point shall be changed according to the actual situation, and then the detection shall be repeated to check the coincidence of the two detection results, so as to improve the accuracy and accuracy of detection.

6、對于定向鉆方式鋪設(shè)的PE管道,由于示蹤線的埋深較大(可能大于5m),除選擇較低的工作頻率以減少電磁場感應(yīng)到其它管線上,還應(yīng)盡量設(shè)法改善接地條件,增加示蹤線上的供電電流,提高信噪比,這樣可獲得較好的探測效果。

6. For PE pipes laid by directional drilling, due to the large buried depth of the tracer line (which may be greater than 5m), in addition to selecting a lower working frequency to reduce the induction of electromagnetic field to other pipelines, we should also try to improve the grounding conditions, increase the power supply current on the tracer line, and improve the signal-to-noise ratio, so as to obtain better detection results.

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