Differential and temperature compensating type on-line testing method and system for bridge cable force

A technology of online testing and temperature compensation, which is applied in tension measurement, hysteresis curve measurement, magnetic susceptibility measurement, etc., can solve problems such as installation and maintenance difficulties, and achieve the effects of convenient installation and debugging, good dynamic response, and convenient cable force test

Inactive Publication Date: 2007-04-25
CHONGQING YA PAI BRIDGE ENG QUALITY TESTING CO LTD
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Problems solved by technology

[0018] In view of the deficiencies in the prior art above, one of the purposes of the present invention is to propose a differential temperature compensation type bridge cable force online testing method based on the magnetoelastic effect, and the second purpose is to propose a testing system for realizing the method. To solve two problems: one is to solve the problem of difficult installation and maintenance, and the other is to solve the problem of temperature compensation

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  • Differential and temperature compensating type on-line testing method and system for bridge cable force

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Embodiment Construction

[0030] Below in conjunction with Fig. 1, the process of structure and method realization of this system is described further:

[0031] Cut a section of the bridge cable under test (or a bridge cable of the same quality and type as the bridge cable under test) with a suitable length as the reference bridge cable [12] to form a reference magnetic circuit. The iron core [33][34] and the yoke iron [42] in the reference magnetic circuit are fixed on the reference bridge cable [12] by the magnetic tile [23][24], and the magnetic tile [23][24] connects the reference bridge cable [12], and fix it with fastening countersunk bolts [62]. A certain distance should be reserved in the middle, wherein the magnetic tile [23] [24] and the iron core [33] [34] are integrated; refer to the magnetic The excitation coil [53] is installed on the iron core [34] of the road, and the measuring coil [54] is installed on the iron core [33]. .

[0032] Install the iron core [31][32] and the yoke on the ...

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Abstract

An on line test method and test system of differential type temperature-compensating bridge rope force based on the magnetoelasticity is disclosed. The bridge rope is the ferromagnetic material and placed in the specific magnetic field, the bridge rope will be magnetized; the magnetic conductivity of bridge rope will change with the variety of stress condition and temperature. The sensor comprises operating magnetic circuit and reference magnetic circuit, in every designing of the magnetic circuit, the bridge rope is just a part of the magnetic circuit and not as the iron core of the actuating coil and the measuring coil. The reference magnetic circuit of sensor just feels the changes of temperature, but the operating magnetic circuit feels the changes of temperature and rope force, the output signal of the operating magnetic circuit and the reference magnetic circuit is differential to eliminate the temperature effect, the value of rope force can be tested with the corresponding relationship between the change of magnetic conductivity and rope force. The test method of rope force in the invention characterized in high accuracy, well dynamic response, low price of sensor, convenience of mounting and conditioning, long service life, strong overcurrent protection power, fitting for static and dynamic measurement, sampling just in time in all-weather, the testing results are free of effects of anticorrosive coating and protective plastic casing which is in surface of bridge.

Description

technical field [0001] The invention relates to magnetic physics, magnetoelastic effect of ferromagnetic materials and sensing technology, in particular to magnetoelastic effect sensing and cable force testing of bridge cables. technical background [0002] At present, there are mainly the following types of methods for testing bridge cable force. [0003] 1. Pressure gauge method [0004] When the bridge cable is stretched with a jack, the cable force can be obtained by measuring the hydraulic pressure of the oil cylinder through a precision pressure gauge or a hydraulic sensor. This method is simple and easy to implement, and it is the most practical method to control the cable force in 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, there are disadvantages such as easy misalignment of the pointer, severe pointer vibration under high pressure, large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/12G01L5/04G01R33/14G01R33/16
Inventor 黄尚廉唐德东陈伟民廖昌荣
Owner CHONGQING YA PAI BRIDGE ENG QUALITY TESTING CO LTD
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