Bridge deflection measuring method

Abstract

The invention relates to a bridge deflection measuring method. A deflection measuring device is arranged on a detected beam body. The deflection measuring device comprises a level gauge suspended under a detected beam body and a measuring part. The level gauge is used for detecting the height of the measuring part; the measuring part comprises a first measuring part arranged at the end of the detected beam body and a second measuring part arranged at the place of the maximum deflection value of the detected beam body. The level gauge is positioned between the first measuring part and the second measuring part; and when no load is applied to the upper side of the detected beam body, the level gauge measures the heights h1 and h2 of the first measuring part and the second measuring part; andafter the load is applied to the upper side of the middle of the detected beam body, the level gauge measures the heights H1 and H2 of the first measuring part and the second measuring part; and thedeflection value of the middle of the detected beam body is equal to (H1-h1)+(H2-h2). The invention provides the deflection measuring device capable of accurately measuring the deflection of the beambody.

Description

technical field [0001] The invention relates to a bridge deflection measuring method in the technical field of bridge safety. Background technique [0002] For new bridges and bridges that have been strengthened or rebuilt, load tests are required to verify whether the normal service state and bearing capacity of the bridge structure meet the design requirements. [0003] The deflection is the maximum sinking distance at the most unfavorable position in the middle of the beam span after the beam is loaded, which is an important parameter for the safety performance of the beam. The maximum deflection value of the beam at this position corresponds to a bridge. The position where the maximum deflection of the beam body occurs, that is, the most unfavorable position, is known and determined. There are mainly two methods for deflection detection in the prior art. One is to install a cable displacement sensor or a laser displacement sensor between the most unfavorable position of...

AI Technical Summary

Problems solved by technology

There are mainly two methods for deflection detection in the prior art. One is to install a cable displacement sensor or a laser displacement sensor between the most unfavorable position of the beam body and the ground. When there is a vehicle load on the upper side of the most unfavorable position of the beam body, , to detect the sinking distance generated in the middle of the beam span. The problem with this detection method is that it needs to use the ground, and the flatness of the ground will affect the measurement accuracy. Of course, it is impossible to install the sensor when encountering a bridge across the water; the other is The deflection measuring instrument is installed on the bridge surface, but it has the following problems. There is a vehicle as a load at the most unfavorable position of the beam body, and the deflection measuring instrument cannot be installed at the most unfavorable position of the beam body. In addition, on the upper side of the beam body The asphalt pavement has been paved, and the vehicle load produces a certain amount of deflection on the asphalt pavement, which will affect the judgment of the deflection of the beam body

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