Optical fiber intelligent hoop for monitoring volume expansion deformation caused by corrosion of reinforcing steel bar

Abstract

The invention provides an optical fiber intelligent hoop for monitoring the volume expansion deformation caused by corrosion of a reinforcing steel bar, and belongs to the technical field of structural health monitoring. The optical fiber intelligent hoop for monitoring the corrosion volume expansion deformation caused by corrosion of the reinforcing steel bar comprises a metal clamping hoop left half part, a metal clamping hoop right half part, a deformation sensing unit, a reinforcing steel bar size adjusting telescopic rod, a nut, a screw, a metal clamping hoop upper packaging shell, a metal clamping hoop lower packaging shell, a shell reserved small hole and an optical fiber protection hose. The optical fiber deformation sensing units arranged along the periphery of the hoop are based on the Fabry-Perot optical fiber sensing principle, rebar corrosion volume expansion deformation is converted into Fabry-Perot cavity length changes in the sensing units through deformation sliding blocks in the optical fiber deformation sensing units, the changes are read by a connected optical fiber demodulator, and therefore the rebar corrosion volume expansion deformation amount is deduced in a reverse mode. The real-time, accurate and nondestructive monitoring on the corrosion expansion deformation of the reinforcing steel bar is realized. The optical fiber intelligent hoop is convenient to operate, high in precision, high in external interference resistance, high in applicability and wide in application prospect.

Description

technical field [0001] The invention relates to an optical fiber smart clamp for monitoring the volume expansion and deformation of steel bar corrosion in a concrete structure, which belongs to the technical field of structural health monitoring, in particular to a kind of marine concrete used for monitoring sea-crossing bridges, subsea tunnels, wharves, etc. in marine environments An optical fiber smart clamp with volume expansion and deformation of steel bars in the structure due to corrosion. Background technique [0002] According to the survey by the International Association of Corrosion Engineers (NACE), the global economic loss caused by metal corrosion reaches 2.5 trillion U.S. dollars every year, which is equivalent to about 3.4% of the global GDP. my country has a coastline of 18,000 kilometers. Some reinforced concrete structures in the marine environment, such as sea-crossing bridges, submarine tunnels, coastal road bridges, and docks, have long been corroded by...

AI Technical Summary

Problems solved by technology

These monitoring methods have their own advantages and disadvantages. For example, ultrasonic monitoring and acoustic emission technology are easily affected by the properties of the concrete cover, and polarization impedance can only provide the corrosion rate of steel bars at a certain time node.

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