Stay cable force measuring device and measuring method therefor

Abstract

The invention provides a stay cable force measuring device and a measuring method therefor. The device is simple in structure, and no expensive high precision equipment such as sensors is needed; a corresponding relation between cable force of a stay cable and radial elastic stress is adopted by the device, a contact type displacement sensor with guaranteed measurement accuracy is adopted for measuring variation of radial deformation and displacement before and after specified radial pressure is applied on the stay cable, and the cable force of the stay cable is measured via a pre-established function relation model between the cable force and deformation under stress; whether the stay cable is in installation processes or is put into use after installation, the cable force of the stay cable can be measured; based on a measurement principle adopted by the device, measurement precision can be prevented from being affected by interference factors such as span, sag, vibration, environment electromagnetic waves and the like of the stay cable; high measurement precision can be guaranteed, universality can be well ensured, convenience of use and operation is realized, and a new solution is provided for measurement of the cable force of the stay cable which is put into use after installation.

Description

technical field [0001] The invention relates to the technical field of cable stress and safety monitoring, in particular to a cable force measuring device and a measuring method thereof. Background technique [0002] Cable force measurement plays an important role in modern building safety inspection and monitoring. At present, four methods are generally used for cable force measurement at home and abroad: (1) pressure gauge measurement; (2) pressure sensor measurement; (3) frequency measurement method; (4) magnetoelastic effect method. [0003] The pressure gauge method is simple and easy to implement. It is a practical method to control the cable force during construction. It can be used to adjust the cable force during the construction of cable-stayed bridges. However, due to some characteristics of the pressure gauge itself, the pointer is easy to deviate. Due to the disadvantages of severe jitter, large reading errors, and the need to convert load indication values, it...

AI Technical Summary

Problems solved by technology

However, the theory of this method and key technologies such as its magnetic circuit structure, material composition, and the influence of ambient temperature on the measurement results need to be further studied and improved, and different magnetic flux models need to be established for different cable materials. For magnetic materials, its magnetoelectric characteristics and temperature compensation curve can only be calibrated in the laboratory, and then the stress of bridge cables made of this material and similar materials can be tested. The test results are related to the selection of the working point, and are easily disturbed by environmental electromagnetic waves Causes measurement errors, has disadvantages such as difficulty in determining the best working point, poor versatility and practicability

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