Bridge deformation monitoring method and system based on laser measurement and 485 bus

Abstract

The invention relates to a bridge deformation monitoring method and system based on laser measurement and a 485 bus and belongs to the technical field of structure deformation or displacement monitoring. Lasers are used as the basis for measuring the deformation of a bridge in the vertical direction, a laser receiving system is installed in the midspan of the bridge, the variation of the positions of the lasers on photosensitive elements after target imaging is converted to obtain information of downwarping of the midspan of the bridge, data of the detection result are transmitted to a forwarder through the 485 bus and the forwarder wirelessly transmits the data to a background master control center. The bridge deformation monitoring system is composed of a plurality of deformation monitors, the forwarder and the background master control center, wherein the deformation monitors are arranged in all the spans to be measured of the bridge; all laser receiving processors on the 485 bus work in a polling mode, and only one laser receiving processor responds to an instruction to output displacement byte data each time. Through the bridge deformation monitoring method and system based on laser measurement and the 485 bus, the downwarping conditions of all the spans of the bridge can be monitored continuously and automatically.

Description

technical field [0001] The invention relates to a structure deformation or displacement monitoring method and system thereof, in particular to a bridge deformation monitoring method and system based on laser measurement and 485 bus. Background technique [0002] At present, the main methods used in bridge deformation detection include steel wire drawing method, level method, theodolite method and so on. The steel wire drawing method requires simple equipment and is easy to operate, but it is difficult to control the pulling force of the steel wire. At the same time, the steel wire has certain elasticity and toughness, especially after being bent, it is not easy to straighten. In addition, the influence of the steel wire's own weight causes a large measurement error. The level method has a blind spot in the short-distance measurement, and in the long-span measurement, the reading scale of the general level is blurred, which affects the accuracy. The theodolite method can onl...

AI Technical Summary

Problems solved by technology

The steel wire drawing method requires simple equipment and is easy to operate, but the pulling force of the steel wire is difficult to grasp. At the same time, the steel wire has certain elasticity and toughness, especially after being bent, it is not easy to straighten. In addition, the influence of the steel wire's own weight causes a large measurement error

The level method has a blind spot in the short-distance measurement, and in the long-span measurement, the reading scale of the general level is blurred, which affects the accuracy

Theodolite method can only measure the load deformation of the main girder, and cannot reflect the static load

The most important point is that neither of the latter two methods can achieve continuous automatic monitoring

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