Embedded steel-string strain sensor with adjustable rigidity

Abstract

Provided is an embedded steel-string strain sensor with adjustable rigidity. The embedded steel-string strain sensor comprises a housing. Each of both ends of the housing is equipped with an end seat. Each end seat is fixedly connected with a wire clamp. A steel string capable of generating resonance is connected between the two wire clamps. An electromagnetic coil is disposed on the housing under the steel string. External threads are disposed on the outer side of the housing along the length direction of the housing. The strain sensor also comprises a protective pipe which is a hollow ring. The internal diameter of the protective pipe is equal to the external diameter of the housing. Internal threads are disposed on the inner wall of the protective pipe and match the external thread on the housing. The strain sensor has beneficial effects that the operating rigidity of the steel-string strain sensor is adjustable, and that the rigidity of the steel-string strain sensor is adjusted to rigidity of surrounding rocks in order to solve a problem that a conventional sensor and the surrounding rocks do not match in rigidity and improve testing precision.

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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