Application Method of Underground Pipeline Detector

Surface water pipelines refer to water supply, drainage (rainwater, sewage), gas, electric power, communication, heating, industrial and other pipelines. It is an important part of urban infrastructure and the basic basis of urban planning, construction and management. Underground pipeline detector is a common pipeline detection equipment, which is often used in various pipeline detection projects. At present, the electromagnetic method based on the law of electromagnetic induction is the most convenient, effective and commonly used in the detection of underground pipelines. The receiver measures the change of the secondary field generated by the underground pipeline under the action of the transmitting airport on the ground, so as to judge the spatial position of the underground pipeline. It is generally believed that the secondary field excited by a straight line can be regarded as the electromagnetic field generated by an infinite straight line. The receiving device locates the pipeline and determines the depth according to such electromagnetic field changes. The experimental results show that the measurement results are very accurate without the interference of other pipeline fields. In order to detect pipelines accurately, quickly and efficiently, different detection methods should be selected according to the characteristics of underground pipelines. The detection methods of pipeline detector can be divided into the following categories: first, induction detection method. Excitation pipeline of transmitter under different placement states. The underground pipe detector uses the principle of electromagnetic induction to detect the precise direction and depth of underground metal pipelines and cables, and find out the fault points outside the pipeline. The underground pipe detector has the functions of intelligent, graphic operation indication and audio modulation indication of all Chinese characters. It is the most convenient underground pipe detector today. The built-in ohmmeter of the transmitter can automatically measure the loop resistance and automatically match the continuous output impedance to ensure the optimal output signal. The instrument can select the coupling according to the needs of practical application. Under the condition of continuous power supply, it can be used to find the path of live cable for testing. Using the 50Hz detection function of the receiver, it can also track the 50Hz power frequency signal sent by the running cable, truly achieve one machine with multiple functions, and has the best performance and cost performance. Its basic working principle is that the transmitter generates electromagnetic wave and transmits the transmitted signal to the detected underground metal pipeline through different transmission connection modes. When the underground metal pipeline senses electromagnetic wave, induced current is generated on its surface, and the induced current propagates far along the metal pipeline. In the process of current propagation, The electromagnetic wave is radiated to the ground through the underground metal pipeline. Therefore, when the underground pipeline detector detects on the ground, the electromagnetic wave signal will be received on the ground directly above the underground metal pipeline. Through the change of signal strength, the position and direction of the underground metal pipeline can be judged. According to the detection principle, underground pipeline detectors are divided into two categories. One is to detect metal pipelines, electric / optical cables and some non-metallic pipelines by using the principle of electromagnetic induction, in which the non-metallic pipelines are equipped with metal marking lines; The other is the use of electromagnetic waves to detect underground pipelines of various materials, which can also detect underground objects, commonly known as radar, also known as pipeline radar. Underground pipeline detector is generally composed of transmitter and receiver. Transmitter: apply the signal current of specific frequency on the tested line, and generally adopt three excitation methods: direct connection method, induction method and clamp. Receiver: there is an induction coil in the receiver to receive the magnetic field signal of the pipeline. The coil generates induced current and calculates the direction and path of the pipeline.

Application Method of Underground Pipeline Detector 1

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