Plane strain measurement sensor

Abstract

A plane strain measuring sensor has the characteristics: at least two bolt holes or locating slot holes are processed in top surface axial direction of multi-direction support, radial hole processed on the same plane with lateral face radial direction is corresponding and interconnected to the bolt holes or locating slot holes of top surface, at least two connecting rods has one end separately set in radial hole of multi-direction support and another end linked separately to the sensors on the same plane but different directions. Tested in laboratory and by bridge load test, the invention is proved to have the advantages: rational design, high sensitivity, easy standardization, small linear error, excellent interference killing and dampness feature, good stability, changeable standardization, wide use, apart from these, after linking to static strainometer or dynamic strainometer, it can measure strain on the same plane but different directions of building unit such as highway bridge and railroad bridge and that of metal unit as well.

Description

technical field [0001] The invention belongs to the technical field of equipment for measuring relative displacement, and in particular relates to a plane strain measuring sensor. Background technique [0002] Strain is usually one of the main physical quantities that need to be observed in engineering quality inspection, service life evaluation, disease cause analysis, and new structural type test research of bridges and various building structures. There are two main methods used to measure building strain at present. One is the strain gauge, which is directly pasted on the detected part of the structure during use. Chip placement, wire bonding, and chip sealing are often carried out at a height of several meters or even tens of meters, which is relatively difficult, difficult to guarantee quality, and relatively low efficiency. Moreover, the measured value is greatly affected by the ambient temperature and humidity, and there are often some points. The measured value dr...

AI Technical Summary

Problems solved by technology

The strain gauge of this structure has been tested in the laboratory and the bridge construction house. Compared with the strain gauge, the strain gauge of the double cantilever concrete structure proves that it has high sensitivity, easy calibration, small linear error, good long-term stability, It has the advantages of variable gauge length, low production cost, wide application range, strong moisture resistance, stable output signal, and convenient use. However, this strain gauge can only measure the strain in one direction on the surface of the structure. Strain in different directions, unable to test

In addition, this kind of double-cantilever concrete structure strain gauge does not have a heat insulation layer in the sensor. During the test, due to temperature changes, the spring leaf installed in the sensor is deformed due to temperature changes. The spring leaf directly feels the measured temperature. The deformation of the component under load, the strain gauge installed on the spring piece senses the deformation of the spring piece and outputs the strain signal, which has a great influence on the measured strain data

Images