Fiber grating dislocation gauge with wedge-shaped structure

Abstract

The invention discloses a fiber grating dislocation gauge with a wedge-shaped structure. The fiber grating dislocation gauge comprises a sliding head, rectangular-section overhanging beams, a fiber grating, a driving rod, a limiting plate, a spring, a wedge block, a protective shell and a sliding conduction arm; a sensing part is formed by the sliding head, the overhanging beams, the fiber grating, the driving rod, the spring, the wedge block, and the like; a conduction part is formed by a fixed rod and a sliding rod; the mechanism of the dislocation gauge is as follows: free ends of the overhanging beams are enabled to slide along an inclined plane of the wedge block by means of the sliding of the sliding head, so that the differential settlement is converted into the deflection at the free ends of the overhanging beams, and the Bragg reflection wavelength of the sensing fiber grating, which is stuck at the position close to fixed ends of the overhanging beams, is further changed; furthermore, the problem of cross sensitivity of the fiber grating is solved by using a reference grating method. The fiber grating dislocation gauge provided by the invention is high in measurement accuracy, adjustable, high in environmental adaptability and good in stability, and has a temperature self-compensating function and anti-electromagnetic interference performance, thus having better engineering application prospect.

Description

technical field [0001] The invention is based on optical fiber grating technology, and is a sensor for real-time monitoring of the relative settlement of structures on both sides of an underground pipe gallery settlement joint, belonging to the technical field of optical fiber sensing. Background technique [0002] The urban underground comprehensive utility corridor is an urban underground comprehensive utility corridor network planned and constructed prior to the development of the surrounding land, which solves the problem of energy demand in the development and operation of the surrounding areas. With the development and utilization of the surrounding plots, especially the excavation of deep and large foundation pits and the large-scale drop of underground confined water, settlement and deformation of the completed underground comprehensive pipe gallery will occur. If the relative settlement on both sides of the settlement joint is too large, It can lead to deformation a...

AI Technical Summary

Problems solved by technology

With the development and utilization of the surrounding plots, especially the excavation of deep and large foundation pits and the large-scale drop of underground confined water, settlement and deformation of the completed underground comprehensive pipe gallery will occur. If the relative settlement on both sides of the settlement joint is too large, It can lead to deformation and cracking of various engineering pipelines inside the pipe gallery, affecting the normal supply of electricity, gas, heating, etc., and even major safety accidents

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