NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–POE checker
In the exploration tasks of urban underground pipelines, there are many types of pipelines, various materials, different units, and different laying time and methods. The pipelines are often arranged irregularly and horizontally, which brings great difficulties to the exploration work. In the exploration tasks of urban underground pipelines, pipelines can only be used for exploration. There are many types of pipelines, various materials, different units, and laying time and methods. Also different. The pipelines are often irregularly arranged, which brings great difficulties to the exploration work, and can only be detected with the help of pipeline detectors.
The following small series will tell you in detail some of the problems encountered in pipeline exploration. Urban comprehensive underground pipelines are an important part of urban infrastructure and are the“lifeline”and“blood vessels”. For various reasons, at present, many cities in our country have problems such as unclear distribution of underground pipelines, incomplete pipeline archives and inaccurate information, etc., which often lead to accidents of underground pipelines being damaged during urban construction.
Therefore, to find out the status quo of urban underground pipelines and manage pipeline data through information systems is the need for urban planning, construction and management, and is a necessary measure to ensure the normal production and life of urban people and urban development. In the exploration of urban underground pipeline detectors, there are many types of underground pipelines, various materials, different ownership units, and different burying time and burying methods. Pipelines often cross vertically and horizontally, and overlap up and down, which leads to accurate detection of various pipelines. It is difficult to bury it deeply. To sum up, the difficulties often encountered in the detection of underground pipelines are: one is the detection of parallel and densely buried pipelines; the other is the detection of non-metallic pipes; the third is the detection of long-distance and large buried pipelines.
Fourth, trenchless laying of pipelines. For the exploration of parallel pipelines, the direct method or the clamp method is preferred to reduce the interference of adjacent pipelines. However, in actual work, due to the lack of obvious points, no good grounding conditions, etc., the direct method and the clamp method cannot be used, and only the induction method can be used.
To this end, the following methods can be used in pipeline exploration: Horizontal pressure line method: According to the vertical dipole, when the signal is applied, the pipeline directly below it is not excited, but the characteristics of the adjacent pipeline are excited, and the transmitter is placed horizontally and placed adjacent to the interference pipeline. directly above, thereby suppressing the underground interference pipeline and highlighting the signal adjacent to the target pipeline. This is an effective means of probing parallel pipelines. Vertical line pressing method: Use the horizontal dipole to apply the signal, and the pipeline directly below the coil has the strongest coupling characteristics. Put the transmitter upright and place it directly above the target pipeline, thereby suppressing the adjacent interference pipeline and highlighting the target pipeline signal, so as to distinguish parallel pipelines .
This method is suitable for parallel pipelines with shallow buried depth and large spacing. Inclined line pressing method: When the distance between parallel pipelines is small, the detection effect of the above methods is not good, and the inclined line pressing method can be used. The method is to select the appropriate transmitter position and inclination angle according to the spatial distribution position of the target pipeline and the interference pipeline. On the premise of keeping the transmitting coil axially aligned with the interference pipeline, try to place the transmitter near the target pipeline, so as to Ensure that the target pipeline is effectively stimulated and the interference pipeline is suppressed.
Some relevant introductions about the underground pipeline detector above, I hope to be helpful to all friends.
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