Device and method for measuring prestress of prestress steel strand

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.

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...

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Problems solved by 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 optical fiber sensing technology pre-embeds the Bragg grating sensor into the prestressed concrete to realize the detection, but as time goes by, the aging of the sensor increases, which seriously affects the measurement accuracy; the magnetic flux method uses the electromagnetic effect of steel to analyze the stress distribution However, the prestressed steel strand in prestressed concrete is stressed, and the magnetic coil cannot be loaded, so it cannot be used; in summary, there is no prestress measurement for the prestressed steel strand Appropriate and accurate method

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