Bridge construction cable force testing method and device based on bionic principle

Abstract

The invention belongs to the technical field of long-span bridge engineering construction monitoring, and particularly relates to a bridge construction cable force testing method and device based on the bionic principle, and the device comprises a bionic sensing element, a bandage, a data collection unit, a power supply unit, and a cable force analysis system. The data acquisition unit comprises a controller, a filter, a high-precision ampere meter and a data memory; the power supply unit comprises a lead storage battery, an inverter and a direct-current stabilized power supply; the lead storage battery supplies power to the direct-current stabilized power supply and the data acquisition unit; the direct-current stabilized power supply supplies power to the bionic sensing element; the structure is reasonable, and the purpose of improving the cable force testing precision of the construction cable is achieved by adopting two measures of improving the sensing precision of the sensor on cable vibration signals and optimizing a cable force calculation formula. The device has the advantages of simple equipment installation, advanced sensing element principle, high sensing sensitivity, low price, wide application range and high cable force calculation reliability.

Description

technical field [0001] The invention relates to the technical field of long-span bridge engineering construction monitoring, in particular to a method and device for testing the cable force of bridge construction cables based on bionic principles. Background technique [0002] Long-span bridges, such as concrete-filled steel tube arch bridges, often use cable-stayed buckle-hung hoisting construction methods to construct arch ribs; therefore, real-time monitoring of the cable force of construction cables such as buckle cables and back cables is to ensure that the concrete-filled steel tube arch ribs achieve the expected alignment. Then it is one of the key tasks to make the arch bridge have good service performance and service function. [0003] At present, the test method of construction cable force based on natural frequency is one of the most convenient, relatively accurate and easy-to-operate methods. However, the commonly used vibration pickups at this stage have the di...

AI Technical Summary

Problems solved by technology

However, the commonly used vibration pickups at this stage have the disadvantages of large volume and low test accuracy, and cannot identify pure cable vibration signals, and it is difficult to obtain accurate cable natural frequency based on this; in addition, the commonly used cable force-frequency calculation formula in engineering is also It is relatively simplified, so that the internal force value of the cable obtained by the cable force test method based on the natural frequency is quite different from the actual value, which leads to blind control of the cable force of the construction cable. When the arch rib is hoisted to the predetermined height and fixed by the buckle cable, It is impossible to accurately control the pre-lift amount of the "elevation" and "cable force" of the arch rib, which affects the accuracy of the arch rib closing of the long-span arch bridge and brings safety hazards to the bridge

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