Bridge beam inhaul cable corrosion monitoring system and method based on piezoelectric impedance method

Abstract

The invention belongs to the field of bridge beam inhaul cable corrosion monitoring and discloses a bridge beam inhaul cable corrosion monitoring system based on a piezoelectric impedance method. The bridge beam inhaul cable corrosion monitoring system comprises a piezoelectric ceramic film arranged on the outer wall or the end face of a bridge beam inhaul cable in an attached mode, an impedance analyzer connected to the piezoelectric ceramic film, and a monitoring and alarming device connected with the impedance analyzer. The invention discloses a bridge beam inhaul cable corrosion monitoring method based on the piezoelectric impedance method. On the condition of not influencing the actual stress state of the inhaul cable, the piezoelectric ceramic film is arranged on the outer wall or the end face of the inhaul cable in the attached mode, and the impedance analyzer is used for analyzing the change condition of inhaul cable impedance so that the corrosion condition of the inhaul cable can be monitored.

Description

technical field [0001] The invention relates to the field of bridge cable corrosion monitoring, in particular to a bridge cable corrosion monitoring system and method based on a piezoelectric impedance method. Background technique [0002] Corrosion of bridge cables is the most common and serious damage form of cables, and the corrosion damage of cables is related to the installation, load and protective measures of cables. At present, the detection methods of cable corrosion mainly include: [0003] (1) Manual detection method: mainly check whether the cable system is rusted, whether the fasteners are loose, etc. This method is intuitive and reliable, but the detection range is limited, and it is difficult to monitor sudden accidents in time; [0004] (2) Ultrasonic detection method: It is mainly used to detect cracks and rust pits on the surface of parallel steel wires or steel wires, but it is difficult to accurately locate the corrosion of cables with complex cross-sect...

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Problems solved by technology

[0003] (1) Manual detection method: mainly check whether the cable system is rusted, whether the fasteners are loose, etc. This method is intuitive and reliable, but the detection range is limited, and it is difficult to monitor sudden accidents in time;

[0004] (2) Ultrasonic detection method: mainly used to detect cracks and rust pits on the surface of parallel steel wires or steel wires, but it is difficult to accurately locate the corrosion of cables with complex cross-sectional shapes. Ultrasonic waves can only perform surface detection, and there are large detection blind spots

[0005] (3) Radiation detection method: It can detect internal damage and defects of the cable, but the radiation device is often large, and it is not suitable for the monitoring of large structures

[0006] (4) Acoustic emission method: mainly used for the monitoring of broken wires in the cable, but the signal attenuation is large, and it is not suitable for the monitoring of large structures

[0007] (5) Magnetic flux leakage method: suitable for corrosion and broken wires in the free section of the cable, but the work efficiency is low and the detection accuracy and sensitivity are not high

[0009] (7) Fiber grating monitoring method based on corrosion and expansion: based on the corrosion and expansion mechanism of steel bars, it avoids interfering with the corrosion interface, but the air-permeable adhesive layer and the wrapped optical fiber substantially affect the intrusion of ions, which is different from the real corrosion environment, and the expansion Limited by concrete extrusion, its sensitivity and effectiveness have yet to be tested by engineering

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