Method for testing deflection/longitudinal displacement change of bridge based on four-quadrant position detector

Abstract

The invention discloses a method for testing a deflection / longitudinal displacement change of a bridge based on a four-quadrant position detector. The method is characterized by comprising the following steps: firstly, the four-quadrant position detector is installed in the centre of the bridge or other points to be tested at the bottom of a bridge deck; a laser source is installed on a pier and / or a certain point below the bridge deck through an electric displacement table; then, testing is carried out by matching the four-quadrant detector with the laser source, so that the light spot of laser is over against the centre of the detector; when the deflection of the bridge deck changes, the four-quadrant detector longitudinally moves together with the point to be tested; the light spot position, formed on the four-quadrant detector, of the laser moves oppositely relative to the detector; and different position coordinates of the light spot on the detector before and after the deflection of the bridge changes and light spot position variable quantity on the four-quadrant detector, namely deflection position variable quantity of the point to be tested on the bridge deck can be calculated. The method disclosed by the invention has the advantages of simple structure, good controllability and high precision and is capable of realizing real-time online test of the deflection / longitudinal displacement of the bridge.

Description

technical field [0001] The invention relates to exploration or detection with an optical device, in particular to a method for testing bridge deflection changes with a four-quadrant position detector. Background technique [0002] As an important connection facility of the transportation network, the bridge has an extremely important position in the transportation and economic development of our country. In the process of bridge construction, due to unreasonable bridge structure design, construction and management, and lax management; and in the process of bridge operation, due to changes in geological conditions, wind force, water level rise, air, temperature, earthquakes and other natural The influence of factors and the load of the bridge itself and the dynamic load generated under the full-load operating condition of the bridge make it inevitable that various deformations and damages will occur on the bridge, and even bridge collapse and fracture will occur. Due to the ...

AI Technical Summary

Problems solved by technology

However, at present, ultrasonic liquid level detectors are generally used for liquid level detection to complete deflection measurement, and the measurement accuracy is relatively low, only at the centimeter level

By comparing the above several bridge deflection measurement methods, we can know that none of the existing deflection measurement methods can meet the requirements of bridge deflection measurement

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