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Underground drainage pipeline leakage detection method and device

A technology for underground drainage and detection methods, applied in pipeline systems, mechanical equipment, gas/liquid distribution and storage, etc.

Inactive Publication Date: 2011-08-17
GUANGXI UNIV
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Problems solved by technology

[0009] Among the methods mentioned above, the CCTV method is accurate and intuitive to judge, and can directly detect the structural defects of the drainage pipe, but its shortcoming is that the water in the pipe needs to be drained before the detection. In order to clearly understand the condition of the inner wall of the pipe, If necessary, pre-clean the inner wall of the pipe
The combined application of DC voltage gradient method and closely spaced potential measurement method can accurately detect the damage of the cathodic protection layer of metal pipelines, but the detection object is metal pipelines, not non-metallic underground drainage pipelines

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  • Underground drainage pipeline leakage detection method and device
  • Underground drainage pipeline leakage detection method and device
  • Underground drainage pipeline leakage detection method and device

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[0034] Such as figure 1 As shown, one end of the power supply 1 is connected to the high-sensitivity ammeter 2, and the other end is connected to the detector 6. The detector 6 is attached with a pressure sensor, and the ammeter 2 is connected to the detection electrode 3. Before the detector is inserted into the pipeline, the entire circuit is in an open state. When the detector is inserted into the pipe and the pipe is filled with water, a closed circuit is formed. In this circuit, the soil exhibits low-resistance characteristics, and the water in the pipeline also exhibits low-resistance characteristics. Although the undamaged pipe wall exhibits high-resistance characteristics, it exhibits low-resistance characteristics when there are damaged points. When the detector moves in a pipeline full of water, under normal circumstances, the loop current formed by the detection electrode, detector, soil, and pipe wall is very small. When the detector moves to the damaged point of t...

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Abstract

The invention provides a method for simply and conveniently detecting nonmetal underground drainage pipeline leakage and a device. The method comprises the following steps: a detector is used for detecting the traverse pressure of a buried pipeline with water, an independent resistance measuring apparatus is used for detecting a soil resistance value above the buried pipeline, a detection electrode is inserted for adjusting the size of a detection electric current sent out by the detector according to different soil resistance values, an electric current detection device which is connected to the detection electrode is used for collecting leakage electric currents in real time and transmitting data of the electric current detection device to the measuring apparatus, and a computer is used for analyzing so as to obtain the accurate position of a damage pipeline.

Description

technical field [0001] The invention relates to pipeline leakage detection technology, in particular to a method and device for underground drainage (sewage) pipeline leakage detection. Background technique [0002] The problem of pipeline leakage has a long history, and there have been a large number of mature applications in the leakage detection of gas pipelines, oil pipelines, water supply pipelines, etc. However, the detection of leakage in underground sewer pipes has not received widespread attention. With the gradual improvement of environmental protection awareness, people began to realize that the leakage of underground sewage pipes will pollute the soil around the pipes, thereby affecting vegetation and even endangering the safety of groundwater. The current mature detection methods mainly include the following: [0003] CCTV method (Closed Circuit Television): It uses a camera mounted on a vehicle to take pictures and evaluate the status of damaged pipelines. C...

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Application Information

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IPC IPC(8): F17D5/06
Inventor 胡湛波张协奎黄振峰彭智波孙全民郝晓明刘成魏群
Owner GUANGXI UNIV
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