Self-sensing parallel steel wire inhaul cable and manufacturing method thereof

Abstract

The invention provides a self-sensing parallel steel wire inhaul cable and a manufacturing method thereof. The self-sensing parallel steel wire inhaul cable comprises a cable body and anchoring assemblies at the two ends, wherein a plurality of steel wires which are arranged in parallel are arranged in the cable body, a groove is formed in one or more steel wires, and a fiber grating sensor is embedded in the groove. The fiber grating sensor and a traditional parallel steel wire inhaul cable are organically combined to form an integrated structure, the environment, stress and loss states in the inhaul cable use process can be effectively monitored and evaluated, and direct information is provided for the safety assessment of the feedback guide cable installation construction and the lateroperation process. The embedded sensor can ensure the survival rate of the sensor, moreover, the complex procedure of a non-contact sensor is reduced, the installation error of the sensor is eliminated, and the self-sensing parallel steel wire inhaul cable and the manufacturing method thereof can be widely used for real-time monitoring of the inhaul cable force of a bridge rock and soil structure.

Description

technical field [0001] The invention relates to the technical field of cables used in bridge geotechnical structure engineering, in particular to a self-sensing parallel steel wire cable and a manufacturing method thereof. Background technique [0002] As a component that bears tension, the cable has been widely used in bridges, geotechnical, construction and other projects. The cable mainly includes clip anchors, cold cast anchors, hot cast anchors and other forms. In the patent literature with the authorized announcement number CN 100354471C, a durable ultra-high-strength parallel steel wire cable is described, including the cable body and cold cast anchorages fitted at both ends of the cable body, and the pier head at the end of the steel wire is used to add grouting. The material double anchoring method has excellent anchoring reliability and anchoring durability. At present, such parallel steel wire cables are widely used in bridge structures such as large cable-stayed...

AI Technical Summary

Problems solved by technology

The magnetic flux sensor measurement line needs to be energized, the connecting cable is thick and susceptible to interference, and is easily damaged in severe weather conditions such as thunderstorms; the transmission distance is limited by the line resistance, the longer the line, the greater the error, and the longest is only 200 meters; The coil is enameled wire, the durability is doubtful, multiple anti-corrosion is required, and there is a possibility of aging in long-term monitoring

After the pressure sensor is installed, the volume of the anchor head becomes larger, and the production and maintenance costs are high

The long-term durability and stability of the hydraulic sensor are poor, and long-term and stable monitoring cannot be performed

[0004] In the patent document with the application number 201710237787.7, a parallel steel wire bridge intelligent cable-stayed cable is recorded, which solves the defect that the cable body cannot be monitored in real time in the prior art, including the cable body formed by twisting multiple strands of steel wire , the outer circumference of the central steel wire of the cable body is provided with a groove, the groove has a helical section along the outer circumference of the central steel wire, a fiber grating strain sensor is arranged in the groove, and an epoxy resin is used between the optical fiber grating strain sensor and the inner wall of the groove Glue isolation, the groove is filled with epoxy glue and fixed to protect the fiber grating sensor

According to this production method, the steel wire with the fiber grating sensor planted in the center of the cable, and the fiber grating sensor extending out of the end of the central steel wire will inevitably lead to the failure of the steel wire to pierce and affect the anchoring performance, and the outlet end is set on the wire splitting plate In addition, the tooling used when installing anchor cups and other components can easily crush the outlet end of the optical fiber, which seriously affects the survival rate of the self-sensing cable

After the steel wire is grooved in a spiral shape, although the strain of the grating sensor can be reduced to a certain extent, the overall mechanical properties of the steel wire are inferior to the steel wire with straight grooves, and it is easy to be damaged, and it is very easy to pick out the optical fiber from the groove. Damage to the optical fiber, making the fabrication process difficult

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