Vibrating string sensor

Abstract

The invention discloses a vibrating string sensor which includes a spindle sleeve, a steel string, and a pressing piece. The steel string is arranged inside the spindle sleeve. The two ends of the steel string are fixed inside the spindle sleeve. The pressing piece is arranged inside the spindle sleeve and presses the steel string. The pressing piece can move in axial direction inside the spindle sleeve so as to adjust contact points between the pressing piece and the steel string. The pressing piece presses on the steel string, can move in axial direction, and can adjust contact point positions between the pressing piece and the steel string, so that vibration frequency of the steel string is adjusted so as to make the vibration frequency of the steel string and the variation curve of the vibration frequency substantially consistent. In practical application, the vibration frequency measured by each vibrating string sensor can uniformly correspond to a tensile force value. The vibrating string sensor does not have to file the frequency of the steel string and is very easy to use.

Description

technical field [0001] The invention relates to a vibrating wire type sensor, in particular to a vibrating wire type steel bar sensor for detecting the stress on steel bars. Background technique [0002] In the construction of test piles in construction engineering, it is necessary to install vibrating wire sensors on the steel bars to regularly detect the force of the steel bars in the concrete columns. The vibrating wire sensor includes a shaft sleeve, a steel string located in the shaft sleeve and arranged axially, and a test component. The existing installation method of the steel string is to directly lock the steel string on the shaft sleeve with bolts, resulting in each There are certain differences in the degree of tightness, stress, and position of the steel strings on the vibrating wire sensor, which makes each vibrating wire sensor The detected vibration frequencies are different. Even if the same vibration frequency is detected, the force on the steel bar corres...

AI Technical Summary

Problems solved by technology

The vibrating wire sensor includes a shaft sleeve, a steel string located in the shaft sleeve and arranged axially, and a test component. The existing installation method of the steel string is to directly lock the steel string on the shaft sleeve with bolts, resulting in each There are certain differences in the degree of tightness, stress, and position of the steel strings on the vibrating wire sensor, which makes each vibrating wire sensor The detected vibration frequencies are different. Even if the same vibration frequency is detected, the force on the steel bar corresponding to each vibrating wire sensor is also different.

That is to say, in the existing vibrating wire sensor, the vibration frequency of the steel string of each vibrating wire sensor and the change curve of the vibration frequency of the steel string are different. Therefore, in actual use, for each vibrating wire sensor The vibration frequency of the sensor at no load and the vibration frequency under the condition of maximum force should be recorded and archived for comparison and analysis in future regular inspections. Once the data is lost, the actual force of the steel bar cannot be calculated, which is very inconvenient to use. convenient

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