Device and method for measuring prestress of prestress steel strand

A technology of prestressed steel strands and measuring devices, which is applied in the direction of tension measurement, etc., can solve the problems of inability to load magnetic coils, aggravate sensor aging, and affect measurement accuracy, and achieve convenient and fast prestress detection, satisfying long-term monitoring, and equipment The effect of high degree of integration
CN104880273BInactive Publication Date: 2018-01-05CHONGQING JIAOTONG UNIVERSITY
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
CHONGQING JIAOTONG UNIVERSITY
Publication Date
2018-01-05
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

Disclosed in the invention is a pre-stressing force measurement apparatus for a pre-stress steel strand. The apparatus comprises a switching unit, a charging module, and a data processing module. The switching unit charges the charging module by a steel strand; the data processing module collects an input signal and an output signal of the steel strand and converts the input signal and output signal of the steel strand into a charging time signal of the charging module; and an inductance variation of the steel strand is obtained based on variation of the charging time, thereby obtaining pre-stress variation of the steel strand. According to the invention, non-destructive measurement can be realized; convenient and rapid pre-stressing force detection can be realized; no condition restriction exists; and the apparatus and method are suitable for pre-stressing force detection on various occasions.
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Description

technical field

[0001] The invention relates to the field of structure monitoring, in particular to a prestress measuring device for prestressed steel strands and a method for using the device to measure prestress. Background technique

[0002] At present, the prestress measurement methods of prestressed steel strands mainly include magnetic flux method, acoustic sensing method, micro-indentation technology and optical fiber sensing technology. Acoustic sensing uses the changes in propagation speed, amplitude, frequency, etc. that occur during the emission and diffraction of ultrasonic signals in materials, but the measurement accuracy is not high; The indentation resistance and response of the material to the micro-incorporated material determine the mechanical properties of the material, but the method of determining the stress state under the stress state of the prestressed steel strand has no definite results, and it will cause certain damage to the steel strand ; The o...

Claims

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