System and method for monitoring broken wires of PCCP (prestressed concrete cylinder pipe) based on distributed optical fibers

Abstract

The invention discloses a PCCP (prestressed concrete cylinder pipe) broken wire monitoring system and method based on distributed optical fibers. The PCCP broken wire monitoring system comprises an optical system, a data analyzing and processing system and sensing optical fibers laid on the surface of a PCCP. The optical system comprises a laser, an acousto-optic modulator, an erbium-doped fiber amplifier, a fiber bragg grating, a circulator, a photoelectric detector and other units. An emitted optical signal is a pulse signal. When the PCCP pipeline has broken wires, after the sensing optical fiber installed on the surface of the pipeline receives the broken wires, the broken wires are transmitted to the data analyzing and processing host through the optical system, accidents are comprehensively and systematically processed, meanwhile, historical broken wire accidents are called, data such as the number of broken wires and the positions of the broken wires of the PCCP pipeline are analyzed and positioned, and an alarm is given out. According to the method, the accident occurrence trend is scientifically and reasonably speculated, the operation state of the PCCP is comprehensively and online monitored in real time, background workers can conveniently take detailed maintenance measures, and serious accidents such as pipe explosion are avoided.

Description

technical field [0001] The invention belongs to the technical field of PCCP pipeline broken wire monitoring, and in particular relates to a PCCP pipeline broken wire monitoring system and method based on distributed optical fibers. Background technique [0002] The prestressed steel cylinder concrete pipe refers to the water pipe made by winding the circumferential prestressed steel wire on the high-strength concrete pipe core with the steel cylinder, and then spraying a dense cement mortar protective layer on it. It is made of thin steel plate , high-strength steel wire and concrete composite pipe. [0003] Statistics of engineering accidents show that broken wire is the main accident mode of PCCP squib. During the construction and operation of PCCP pipes, steel wires will be damaged or corroded due to various reasons. After the steel wires are corroded to a certain extent, they will break and the strength of the pipelines will decrease. Corrosion further develops, more b...

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Problems solved by technology

[0004] In the prior art, there have been attempts to apply distributed vibration sensing optical cables to PCCP pipeline broken wire monitoring. For example, publication number CN111024210A discloses a method and system for PCCP pipeline broken wire monitoring and pipe bursting. Judging the occurrence trend of broken wires based on the position of broken wires, and giving an early warning, but did not make a systematic analysis of the entire accident and multiple accidents in the early stage. Only through the analysis of a single situation, the vibration of the PCCP pipeline cannot be comprehensively analyzed Comprehensive and systematic inductive statistics were made on the situation, which made it impossible to make a specific review of the accident in the later stage. However, the PCCP pipeline distribution environment is complex, and vibrations caused by other common noises or problems in the layout itself inevitably exist, which leads to Distributed Vibration Sensing Cables Frequent False Alarms

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