An embedded steel string strain sensor with adjustable stiffness

Abstract

An embedded steel string strain sensor with adjustable stiffness, including a casing, an end seat is provided at each end of the casing, and a wire clamp is fixedly connected to each end seat, and a wire clamp is connected between the two wire clamps. Resonant steel strings, located below the steel strings, are provided with electromagnetic coils on the shell, and the outside of the shell is provided with external threads along the length direction of the shell. The strain sensor also includes a protective tube, which is a hollow ring, and its inner diameter is the same as that of the shell. The outer diameter of the protective tube is the same, and the inner wall of the protective tube is provided with an inner thread that matches the outer thread of the shell. Beneficial effects of the invention: the working stiffness of the steel string strain sensor provided by the invention can be adjusted, and its stiffness can be adjusted to the stiffness of the surrounding rock during use, which solves the problem of mismatch between the stiffness of the traditional sensor and the surrounding rock, and improves the test accuracy.

Description

technical field [0001] The invention belongs to the civil construction industry, and relates to a device for monitoring strain inside the surrounding rock of tunnel engineering, in particular to an embedded steel string strain sensor with adjustable stiffness. Background technique [0002] Steel string sensors are important monitoring equipment for civil engineering construction monitoring. When measuring the small strain produced by long-term use of large concrete or steel components or measuring the mechanical performance of components under various loads, it is usually necessary to use strain sensors and their corresponding measurement techniques for corresponding measurements. Generally speaking, the currently used strain sensors generally fall into three categories: electrical resistance strain sensors, vibrating wire strain sensors and optical fiber strain sensors. In the tunnel excavation process, the vibrating wire strain sensor is widely used due to its good stabil...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an embedded type with adjustable stiffness, which solves the problem that the stiffness of the sensor and the surrounding rock does not match at present, so as to accurately measure the unidirectional strain at a certain point inside the surrounding rock of the tunnel.

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