A device for measuring the deflection of medium and small span bridges

Abstract

The invention discloses a deflection measuring device for small and medium-span bridges, which is installed on the main girder to be tested, and includes a column support device, a rigid guide beam, an electromechanical dial indicator, a meter frame connection support device and a data acquisition system. A column support device is installed at the beginning and end of the bridge span of the beam. The column support device is composed of a support base, a threaded column on the upper part of the support base, a height-adjusting nut on the threaded column, and a cube connection device on the upper part of the height-adjusting nut. Both ends of the rigid guide beam They are respectively connected to the cube connection device, the scale is engraved on the outside of the rigid guide beam, and the steel hoop is fixedly installed on the rigid guide beam. The bottom is kept in contact with the main beam to be tested, and the electromechanical dial indicator is connected with the data acquisition system through the data line. The invention can realize accurate positioning of measuring points and rapid data collection when testing the deflection of medium and small-span bridges.

Description

technical field [0001] The invention relates to a deflection measuring device for small and medium span bridges, which can be widely used in many fields such as real bridge detection and test research. Background technique [0002] Regular inspection of the bridge structure is very important. The current condition of the bridge can be evaluated through bridge inspection, which provides a reliable guarantee for later operation and driving safety. So far, the measurement of vertical displacement (deflection) in bridge detection mainly adopts the above two methods, 1. The method of erecting displacement sensors 2. The method of optical instruments. However, it is often interfered by external and human factors, which makes the data unable to be measured accurately. [0003] 1. Bracket erection displacement sensor method [0004] Bracket erection displacement sensor method: During bridge inspection, a bracket is erected between the bottom of the main girder and the ground, and ...

AI Technical Summary

Problems solved by technology

When this method is used for bridge detection, it is necessary to manually hold the scale, which will produce unavoidable human errors, and is often subject to loading vehicles (a test vehicle with a certain weight needs to be parked on the bridge during the static load test, and it is loaded with the weight of the vehicle and The influence of testing the deflection of the main beam), the prism or the ruler cannot stand on the test section, or the line of sight of the total station or laser deflection meter is directly blocked by the arrangement of the loading vehicle, so the test cannot be carried out, and this test method can only measure a single Section, cannot measure multiple sections continuously

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