Stress monitoring sensor and method for connecting bolt of fiber bragg grating structure

Abstract

The invention relates to the field of civil engineering technology, in particular to a stress monitoring sensor for a connecting bolt of a fiber bragg grating structure and a method. The stress monitoring sensor comprises a plain bolt, implanted grating type force measurement sensors and optical fiber outgoing lines. Slender grooves are formed in the left side and the right side of a screw rod of the plain bolt, the minitype grating type sensors are implanted in the grooves respectively, signals are led out of built-in optical fibers, and the optical fibers are closely attached to the screw rod wall in layout, penetrate through small holes formed in corresponding positions of a screw cap and then are led out of the top surface of the screw cap. The optical fiber outgoing lines can be lengthened at will, so a fiber bragg grating type demodulation device can be conveniently adopted to read data of the sensors remotely, and stress states of the connecting bolt of the fiber bragg grating structure are remotely monitored in real time. The built-in stress monitoring sensor has the advantages of being small in size, waterproof, resistant to corrosion, good in electric insulation property, high in anti-electromagnetic interference capacity, basically the same as the plain bolt after being tooled in appearance, convenient to install, capable of adapting to complex environments and remote signal transmission, good in data stability and capable of achieving remote long-term monitoring.

Description

[technical field] [0001] The invention relates to the technical field of force monitoring of steel bolts used for assembling various components in civil engineering structures, in particular to a fiber grating type structural connection bolt force monitoring sensor and method. [Background technique] [0002] In the current urban tunnels on soft ground, the segment tunnel constructed by shield method is a relatively common structural form. The main stress member of the segment tunnel is a reinforced concrete ring. The whole concrete ring cannot be transported and installed in the tunnel. The solution is to decompose these concrete rings into multiple pieces, disassemble and transport them, and assemble them in the tunnel. The block is the segment, and the steel member that assembles these decomposed segments into a ring is the bolt, and the bolt mainly bears the axial force. [0003] Real-time monitoring is required for the force state of the bolts used in the assembled segm...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to design a fiber grating-type structure connection bolt force monitoring sensor and method that can well solve the force monitoring of connecting bolts between components in view of the fact that there is no bolt force monitoring sensor on the market at present.

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