Magnetic levitation bridge deflection measuring device and its measuring method

Abstract

The invention discloses a magnetic suspension type bridge deflection measuring device which is mainly composed of a high-precision miniature linear motor, an outer sleeve and a level adjustable mounting base. The measuring device is based on a principle of magnetic suspension, a constant vertical force is provided for a suspension mass block by using the high-precision miniature linear motor, the absolute height of suspension of the mass block is enabled to be remain unchanged, a fixed point in the deflection test is formed, the linear motor, the outer sleeve and the base move vertically along with deformation of a bridge, and the variation in relative vertical distance between the suspension mass block and the outer sleeve is measured, and the deflection of the bridge can be acquired. The magnetic suspension type bridge deflection measuring device is mainly applied to a bridge deflection test, and can accurately measure the absolute deflection of the bridge without a need of setting an external fixed point; and the magnetic suspension type bridge deflection measuring device can realize dynamic deflection measurement, and is widely applicable to the technical fields of bridge load tests, health monitoring and the like. Accordingly, the invention further establishes a corresponding measuring method.

Description

technical field [0001] The invention belongs to the technical field of bridge deflection measurement, in particular to a magnetic levitation bridge deflection measurement device and a measurement method thereof. Background technique [0002] In today's civil engineering industry, deflection measurement is widely used in buildings, railways, bridges, traffic, dams and other structures. The deflection test of the structure is an important link for engineers to optimize the structural design, understand the stress state of the structure and ensure the safety of the structure. For example, in the long-term health monitoring and bridge load tests of long-span bridges during construction and operation, the monitoring and measurement of bridge deflection at key sections is an important indicator and basis for evaluating the safety status of bridge structures. [0003] Common deflection testing methods include leveling, displacement meter method, static leveling method, radar metho...

AI Technical Summary

Problems solved by technology

Contact measurement methods such as the displacement meter method have high precision and are convenient to test. However, when the bridge crosses obstacles such as rivers, rivers, and mountain streams, or crosses urban roads, there are contact displacement measurement instruments (such as displacement meters, etc.) ) cannot be installed with difficulty

Non-contact displacement monitoring instruments (such as static level, radar, etc.) and leveling measurement methods can realize the deflection test of most bridges, but in the deflection test of long bridges, there are obvious shortcomings: the static level method There are long on-site installation time, high cost, and difficulty in applying to bridges with large longitudinal slopes; the accuracy of radar methods on long bridges cannot be satisfied, and the test efficiency is low; leveling measurement needs to transmit elevations station by station, and long bridges have many measuring points. The distance is long, the time for a leveling measurement is quite long, the labor cost is high, and the influence of human factors is large

For this reason, it is very difficult to accurately and quickly test the deflection of long bridges, which is also a major technical problem in the field of bridge inspection engineering

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