1、地埋示踪线的方法为直连法,它信噪比高、干扰少、易探测,探测结果比较准确可靠。

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、市区内的PE管道示踪线不宜选用感应法探测。城市区域内的管线密集,而示踪线相对细小,其接地回路电阻一般情况下比其它管线大很多,因此产生的感应电流信号往往要比非目标管线弱很多,示踪线信号容易被掩盖而造成误测。

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、在探测短分支管道示踪线时,施加信号点宜选择分支示踪线的末端(即测试桩处),这样分支示踪线上的信号强,不会漏测分支点。

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、用直连法地埋示踪线时,尽量选择较低的工作频率,发射机的接地线也尽量不要跨接其它管线,以减少信号感应或串扰到其它管线。

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、探测时应根据实际情况,改变供电点位置后再重复探测,检查两次探测结果的吻合情况,以提高探测的准确性和精度。

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、对于定向钻方式铺设的PE管道,由于示踪线的埋深较大(可能大于5m),除选择较低的工作频率以减少电磁场感应到其它管线上,还应尽量设法改善接地条件,增加示踪线上的供电电流,提高信噪比,这样可获得较好的探测效果。

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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