A distributed optical fiber cofferdam monitoring system and method capable of eliminating temperature effects

Abstract

The invention discloses a cofferdam monitoring system and method based on distributed sensing optical fibers. The system includes steel sheet piles, distributed sensing optical fibers, a first optical fiber connector, a second optical fiber connector, and a distributed sensing optical fiber demodulator; The inner side of the web of the steel sheet pile is formed with an optical fiber installation groove, the optical fiber installation groove includes a first steel bar, a second steel bar, a first connection part, a second connection part and an angle steel, the first steel bar and the second steel bar are parallel to form a groove, The angle steel and the first steel bar are placed upside down in parallel to form a cavity; the first connecting part connects the first steel bar and the angle steel, and the second connecting part connects the second steel bar and the angle steel; the distributed sensing optical fiber is arranged in the groove and the first connecting part One part is attached to the web, and the second part set in the cavity is fixed on the angle steel; both ends of the distributed sensing optical fiber are connected to the distributed sensing optical fiber demodulator. The invention can provide accurate and reliable monitoring data to ensure the safety and reliability of foundation pit excavation.

Description

technical field [0001] The invention relates to the field of cofferdam monitoring, in particular to a distributed optical fiber cofferdam monitoring system and method capable of eliminating the influence of temperature. Background technique [0002] Cofferdam refers to a temporary enclosure structure (usually made of steel) built for the construction of permanent water conservancy facilities in the construction of water conservancy projects. Its function is to prevent water and soil from entering the construction site of the building, so as to drain water in the cofferdam, excavate the foundation pit, and build the building. Generally, it is mainly used in hydraulic construction. Except as a part of formal buildings, cofferdams are generally removed after use. [0003] In the process of using cofferdam technology, due to the intricacy and changeability of the riverbed, it is impossible to measure the riverbed accurately, so it is easy to cause the collapse of the cofferdam,...

AI Technical Summary

Problems solved by technology

[0005] Existing cofferdam monitoring usually adopts point-type or quasi-distributed monitoring, which has the disadvantages of difficult layout, missed detection, high cost, unstable monitoring, easy to be affected by environmental factors, small monitoring range and insufficient durability

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