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Method for detecting underground pipeline with small aperture and great burial depth

A detection method and underground pipeline technology, applied in geophysical measurement, radio wave measurement system, measurement device, etc., can solve problems such as limited instruments, inability to locate large buried pipelines to be tested, and inability to detect small aperture underground pipelines, etc. Achieve the effects of strong anti-interference, short acquisition cycle and low investment cost

Active Publication Date: 2016-02-03
SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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Problems solved by technology

For deep-buried pipelines, the gyroscope method and beacon tracing method can be used for detection at this stage. However, the gyroscope method is limited by the size of the instrument itself and cannot detect small-diameter underground pipelines. Limited by factors such as the signal strength of its own emission source and the interference of surrounding electromagnetic fields, it is impossible to accurately locate the buried deep pipeline to be measured

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  • Method for detecting underground pipeline with small aperture and great burial depth

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Embodiment

[0014] Example: such as figure 1 As shown, the method for detecting underground pipelines with small apertures and large buried depths in this embodiment is used to detect the precise position information of underground pipelines 1 that have been buried below the ground 6. Generally speaking, underground pipelines with small apertures and large buried depths refer to underground pipelines with a diameter less than 3 cm and buried Underground pipelines 1 with a depth of more than 10m. The purpose of detecting the precise position information of the underground pipeline 1 is to avoid damage to the underground pipeline 1 caused by the excavation construction.

[0015] This embodiment has the following steps in the detection process:

[0016] (1) According to the aperture of the underground pipeline 1 to be tested, the size of the small strong magnetic source 7 is selected to meet the requirement that the small strong magnetic source 7 can move freely in the hole of the undergrou...

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Abstract

The invention relates to the field of geotechnical engineering detection and test, and particularly relates to a method for detecting an underground pipeline with small aperture and great burial depth. The method is characterized in that a strong magnet is placed in an underground pipeline to be detected, an active magnetic source is sent to an area to be detected by adopting a guide rod, then a hole is drilled by the side of the underground pipeline in the area to be detected, a magnetic sensor is placed in the drilled hole so as to measure a magnetic field of the active magnetic source, and accurate location information of the underground pipeline is judged according to acquired magnetic field data. The method has the advantages that the acquisition period is short, the input cost is low, the detection process is high in interference resistance, and the detection result is accurate.

Description

technical field [0001] The invention relates to the field of geotechnical engineering detection and testing, in particular to a detection method for an underground pipeline with a small aperture and a large buried depth. Background technique [0002] Nowadays, with the acceleration of urbanization, the number of underground pipelines as the lifeline of the city is also increasing. The shallow buried underground pipelines laid near the surface have occupied almost all the space. The development of non-excavation construction technology has promoted the development of underground pipelines. It develops in the direction of large buried depth, but it brings corresponding problems such as difficult maintenance and difficult positioning. For deep-buried pipelines, the gyroscope method and beacon tracing method can be used for detection at this stage. However, the gyroscope method is limited by the size of the instrument itself and cannot detect small-diameter underground pipelines...

Claims

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Application Information

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IPC IPC(8): G01V3/08
Inventor 马文亮朱黎明李风生胡绕何伟陆礼训
Owner SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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