Long-term deflection monitoring system and method for long-span bridge

Abstract

The invention discloses a long-term deflection monitoring system and method for a long-span bridge. The monitoring system comprises a plurality of static level gages which are installed on a monitored bridge body through multiple installation frames, the monitored bridge body is a box girder, and the installation frames are installed at the bottom of a box girder top board; each installation frame comprises a triangular supporting frame and a supporting board which is installed on the triangular supporting frame and is adjustable in installation height, the triangular supporting frames are transversely arranged in the bridge direction, and the static level gages are installed on the corresponding supporting boards. The monitoring system is easy and convenient to install and arrange, influence from external environment is small, the monitoring precision is high, and the use effect is good. The monitoring method comprises the first step of determining measured points and selecting a datum point, the second step of installing the installation frames, the third step of installing the static level gages, and the fourth step of monitoring the deflection for a long term. The process of monitoring the deflection for a long term comprises the steps of obtaining the initial liquid level height, determining the monitoring time points of the deflection and monitoring the deflection. The monitoring method is simple in step, convenient to implement, good in use effect and capable of effectively monitoring the deflection of the bridge for a long term.

Description

technical field [0001] The invention belongs to the technical field of bridge deflection monitoring, and in particular relates to a long-term deflection monitoring system and a monitoring method for long-span bridges. Background technique [0002] In the process of long-term monitoring and special inspection of bridges with complex structures, long-term fixed-period monitoring of bridge deflection is required, and in some cases even real-time monitoring is required, and the accuracy of deflection monitoring is high. Higher total stations are used for deflection measurement, and static leveling systems are used for partial bridge monitoring to monitor deflection. Among them, when measuring with a level or a total station, due to the influence of climate, temperature, driving vehicles, safety factors, etc., the accuracy and frequency of the measurement are greatly reduced, and the real-time monitoring of bridge deflection is even more difficult. The current common static leve...

AI Technical Summary

Problems solved by technology

In actual use, the above-mentioned existing static leveling methods have the following serious defects and deficiencies: On the one hand, the monitoring device is arranged on the side or bottom of the beam, which is greatly affected by the natural environment, and the maintenance cost is high. Gouging holes will cause unnecessary damage to the box girder structure; on the other hand, for continuous rigid frame bridges and other bridges with a large longitudinal slope at the bottom of the girder, it is difficult to lay them at a position equivalent to the height of the deformation position of the girder body. According to the measured value of the web or bottom plate, the deflection of the top plate in different chambers can be roughly calculated, and it cannot reflect the precise deflection of the cross bridge at different positions on key sections such as mid-span and quarter points

In summary, the existing deflection monitoring systems and monitoring methods are not easy to achieve accurate, fast, safe, convenient and real-time monitoring of bridge deck deflection

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