Intelligent screw based on optical fiber sensing and application thereof

Abstract

The invention relates to the technical field of bridge cable clamp structure detection, in particular to an intelligent screw based on optical fiber sensing and application of the intelligent screw. The intelligent screw based on optical fiber sensing comprises a screw main body, wherein a mounting through hole is formed in the middle of the screw main body in a penetrating manner in the axial direction; an optical fiber is arranged in the mounting through hole, and a first fiber bragg grating and a second fiber bragg grating are etched on portions, located in the mounting through hole, of theoptical fiber at intervals. The application of the intelligent screw based on optical fiber sensing comprises the steps that any one intelligent screw based on optical fiber sensing is applied to a cable clamp structure of a bridge structure, and the stress and temperature changes of the screw body are monitored through the optical fiber engraved with the first optical fiber grating and the second optical fiber grating. According to the invention, the real-time long-term online detection of a bridge sling structure can be well realized.

Description

technical field [0001] The invention relates to the technical field of bridge cable clamp structure detection, in particular to an intelligent screw based on optical fiber sensing and its application. Background technique [0002] Suspension bridges, cable-stayed bridges, and hanger arch bridges are widely used in long-span bridges. The cable system in the above-mentioned bridge usually includes the main cable (suspension bridge), cable-stayed cable (cable-stayed bridge) and suspender (suspension arch bridge), which are the main stress components of the bridge structure, and the safety and durability of its own structure Sexuality has a great influence on the overall performance of the bridge. [0003] Such as figure 1 As shown, the existing suspension bridge mainly includes a main tower (1), a main cable (2), a cable clamp (3), a screw rod / suspension rod (4) and a bridge body (5). Among them, the cable clamp (3) is set at the main cable (2), the screw / suspension rod (4) ...

AI Technical Summary

Problems solved by technology

The cable clamp (3) needs to be fastened by the screw / suspension rod (4) to generate pre-tightening force to be fixed on the main cable (2) of the suspension bridge, but the fixing between the screw rod / suspension rod (4) and the cable clamp (3) will Loosen over time, eventually leading to insufficient traction and consequently a safety hazard for the bridge

[0004] At present, the non-destructive monitoring of the screw / hanger (4) mainly includes vibration method, pull-out method, ultrasonic method, etc., which are all aimed at the stress monitoring of the screw / hanger (4), and the monitoring error is relatively large, and the screw / hanger cannot be provided. The real-time data of the stress monitoring of the rod (4) lacks the long-term real-time monitoring of the state of the screw / suspension rod (4), and it is difficult to realize the real-time monitoring and early warning of the health status of the cable clamp structure, and there are potential safety hazards

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