System and method for measuring wireless remote control type deflection for bridge load experiment

Abstract

The invention discloses a wireless remote control type deflection measuring system and a method for a bridge load experiment, the measuring system comprises laser projecting devices, an image collecting device, a control and data processing device, a remote controller and a wireless communication controller. The remote controller and the wireless communication controller can transmit and receive communication signals to and from each other; the control and data processing device integrally controls the laser projecting devices arranged on measuring points through the remote controller and the wireless communication controller, thereby completing the quick switchover of the measurement at the measuring points; the control and data processing device processes the image information collected by the image collecting device and finally generates the deflection variables of the measuring points at the bridge. The wireless remote control type deflection measuring system and the method greatly reduce the manpower and material cost of the deflection measurement in the bridge load experiment with reasonable configuration and convenient execution. In addition, the wireless remote control type deflection measuring system and the method can complete measurement at a plurality of points in a short time during the deflection measurement in the bridge load experiment, thereby improving the efficiency and accuracy of the bridge load experiment.

Description

technical field [0001] The invention relates to the field of bridge monitoring equipment, in particular to a wireless remote control deflection measurement system and a measurement method for bridge load experiments. Background technique [0002] Bridge construction has a profound impact on social and economic development. In bridge design, construction, operation and other links, any slight negligence may lead to major losses or even catastrophic accidents, ranging from affecting traffic and consuming a lot of maintenance costs, to destroying bridges and causing huge casualties and property losses From this point of view, the safety requirements of large bridges with huge investment and small and medium-sized bridges with small investment are equally important. Therefore, ensuring the safety of most bridges during their operation is a serious task for bridge engineering circles and government management authorities all over the world, and it is also a common problem in man...

AI Technical Summary

Problems solved by technology

For super long-span bridges, the observation time is long and the observation is quite troublesome, and the stability of the test accuracy is easily affected by factors such as the level of observers

[0009] It can be seen that, for long-span bridges, using the above method to test the bridge load deflection requires a lot of auxiliary testing work, a long test time, and is often affected by various objective factors, resulting in a decline in the accuracy of the deflection test

What is more important is to conduct a comprehensive evaluation of the safety of a bridge structure. It is far from enough to measure the deflection changes at one or two points. It is also necessary to measure the deflection of multiple key parts of the bridge structure. The health status of the bridge can only be predicted through the linear change trend of the bridge. Therefore, the load test usually needs to measure the deflection of multiple measuring points of the bridge at the same time, usually requiring 8 points or more. However, the state of the bridge after the bridge load test is loaded is very It is difficult to maintain for a long time, and all points need to be measured within about 30 seconds, so it is necessary to measure quickly to improve the accuracy of the measurement

Using the existing laser deflection testing device to measure the deflection data of multiple measuring points at the same time has many defects to be improved; The measurement is very difficult. If the laser projection device is manually switched on and off, the distance between the two measuring points is tens of meters, and it will take a few minutes for the surveyor to walk the distance between the two measuring points, and the long-span bridge is very long , and some are four to five hundred meters long or even longer, and the consumption time will be longer; it will still take a long time to start and stop the laser projection device if the ordinary remote control method is used, such as using a walkie-talkie or an ordinary button-type remote control to open Or turn off the laser projection device, which not only increases the cost of labor, but also the speed of manual operation still cannot meet the requirements of fast measurement of multiple measuring points; Manpower and material resources cost; when the laser projection device of each measuring point projects the laser onto a receiving screen, it is necessary to deal with the overlapping problem of the light spots of different measuring points. In addition, it is more difficult for the image acquisition and processing program to identify different spots, so the number of deflection measurement points is limited. If the point-by-point measurement is not only to ensure the rapid switching of the laser projection device at each measurement point to meet the requirements of the measurement time, but also to grasp Only when the laser projection device at each measuring point is switched can the spot data of the corresponding measuring point be collected, otherwise the laser spot data of different measuring points will be confused; the existing technical solutions cannot completely solve the above problems

Therefore, in terms of bridge load experiment testing, there is a lack of a reasonable and convenient multi-point deflection measurement technology solution that can be quickly completed in a short period of time.

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