Measuring method of tensile force of bridge pull rod and device thereof

Abstract

The invention discloses a measuring method of tensile force of a bridge pull rod and a device thereof. In the method, a group of pressure parts and a group of non-pressure parts are respectively arranged between the pull rod anchor head pressure end surface and the bridge pressure end surface, so as to lead the supporting force of the bridge pressure end surface to be applied on the pressure end surface of the pull rod anchor head through the pressure parts, and lead the non-pressure parts to be applied with no force; capacitors with identical specification are arranged in each pressure part and non-pressure part; the directions of the battery lead plates of the capacitors are identical with the directions of the pressure surfaces of the pressure parts; the capacitors in all the pressure parts are arranged in parallel; the capacitors in all the non-pressure parts are arranged in parallel; the two groups of capacitors are connected into a signal processing circuit and are operated therein, so as to measure the size of the capacitance of the capacitors in the pressure parts and the size of the capacitance of the capacitors in the non-pressure parts; the size of pressure of the pressure parts can be converted according to the difference of the two measuring values, and the pressure is equal to the tensile force applied to the pull rod. The invention is characterized by precise measurement, wide measuring range, insusceptibility to environment interference, realization of online monitoring and the like.

Description

technical field [0001] The invention relates to a method and a device for measuring the magnitude of the tensile force on the pull rods of bridges such as suspension bridges and cable-stayed bridges. Background technique [0002] At present, large buildings such as suspension bridges and cable-stayed bridges are often supported by tie rods. The measurement of the tension on these tie rods plays a very important role in evaluating the safety of these structures. In the prior art, the methods for measuring the pulling force of these tie rods mainly include: [0003] Vibration frequency method: use the vibration frequency of the cable to estimate the tensile force on it. However, its error is large, it is seriously affected by environmental factors, its calibration is more complicated, and it is often impossible to measure because it cannot vibrate itself. [0004] Magneto-elastic method: Use the magneto-elastic effect to measure tension, but it often needs to be pre-installe...

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Problems solved by technology

[0006] In summary, the above-mentioned existing measurement methods all have the defect of large measurement error

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