Built-in sensor and method for monitoring internal strain of concrete structure

Abstract

The invention discloses a built-in sensor and a method for monitoring the internal strain of a concrete structure. The built-in sensor comprises a pair of fixed parts fixed in the concrete structure, a shape memory alloy sensing wire which is arranged between the pair of fixed piece and is in a tension state, a pair of conductive wires which are connected to the shape memory alloy sensing wire and are at two ends of the shape memory alloy sensing wire, wherein two ends of the shape memory alloy sensing wire are connected to the pair of fixed pieces and are in the concrete structure, the first part of each of the conductive wires is in the concrete structure, the second part of each of the conductive wires extends out of the concrete structure and is used for connecting a monitor. The built-in sensor of the invention has the advantages of a simple structure, few steps of the monitoring method and easy operation, and the effective monitoring of the internal strain of the concrete structure can be realized in a long period.

Description

technical field [0001] The invention relates to the field of health monitoring of concrete structures, in particular to a built-in sensor and a method for monitoring the internal strain of the concrete structure. Background technique [0002] With the rapid development of cities, the development and utilization of underground space is becoming more and more extensive, and a large number of underground projects have emerged as the times require. The large number of deep foundation pits has put forward high requirements for construction safety, and foundation pit deformation monitoring is becoming more and more important as a measure to ensure the safety of foundation pits. One of the traditional foundation pit monitoring methods is to use the strain gauges attached to the position where the stress is relatively concentrated, and judge the stress or displacement of the structure through the strain reflected by the strain gauges, so as to formulate countermeasures. Traditional...

AI Technical Summary

Problems solved by technology

Traditional constantan strain gauges can only be attached to the concrete structure to measure the surface strain of the concrete structure. However, the internal strain of the concrete structure has a more significant impact on the health of the concrete structure.

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