Prefabricated directly-buried thermal insulation pipeline leakage detection system and method

Abstract

The present invention relates to a prefabricated directly-buried thermal insulation pipeline leakage detection system and method. The system comprises an optical time domain reflectometer, a coupling and shunting device, an optical fiber and a thermal insulation pipeline; the thermal insulation pipeline includes a working pipe, a polyurethane foam thermal insulation layer and an outer sheath layer; the optical fiber is arranged along the working pipe; a plurality of water-absorption-induced expansion adhesive particles are arranged between the optical fiber and the working pipe; one end of the optical fiber is connected with a pigtail; the pigtail is arranged at one end of the working pipe; and the optical time domain reflectometer, the coupling and shunting device and the pigtail are communicated with one another through the optical fiber. According to the prefabricated directly-buried thermal insulation pipeline leakage detection system and method of the invention, the optical fiber is bent in a macro manner by means of the feature of the water-absorption-induced expansion of the water-absorption-induced expansion adhesive particles, and therefore, the retroreflectance curve of the optical time domain reflectometer changes in a step-like manner, the attenuation point of the optical fiber can be determined, and thus, a leakage point on the working pipe is determined. The prefabricated directly-buried thermal insulation pipeline leakage detection system and method of the invention have the advantages of low cost, sensitive reaction, high anti-interference capacity and the like.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation pipeline leakage detection, and in particular relates to a prefabricated direct-buried thermal insulation pipeline leakage detection system and a method thereof. Background technique [0002] The urban water supply pipeline network is a large-scale underground pipeline network system that is widely used. Due to the lack of economical and effective real-time detection methods for a long time, the urban water supply pipeline network system has caused huge losses due to running, running, dripping, and leaking; the bursting of urban water supply pipelines The leakage will quickly cause the ground to subside, and it is easy to be found in time, so as to ensure the maintenance personnel to make a quick maintenance response; The "hidden leak" that is not easy to find in time causes long-term small-flow leakage of water supply pipes, which in turn causes waste of resources, and even the accumul...

AI Technical Summary

Problems solved by technology

[0002] The urban water supply pipeline network is a large-scale underground pipeline network system that is widely used. Due to the lack of economical and effective real-time detection methods for a long time, the urban water supply pipeline network system has caused huge losses due to running, running, dripping, and leaking; the bursting of urban water supply pipelines The leakage will quickly cause the ground to subside, and it is easy to be found in time, so as to ensure the maintenance personnel to make a quick maintenance response; The "hidden leak" that is not easy to find in time will cause long-term small-flow leakage of the water supply pipeline, which will cause waste of resources, and even the accumulation of long-term small-flow leakage will lead to dangers such as road subsidence

[0003] Although there are many ways to detect pipeline leakage, all of them have the problems of high construction cost, complicated construction, and difficulty in comprehensive coverage. Moreover, the sensors used have low accuracy, large errors, and poor anti-interference ability, and the signal lines used for detection are easily oxidized. Affect the detection effect

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