Novel bridge expansion joint device for monitoring displacement of beam end

Abstract

The invention discloses a novel bridge expansion joint device for monitoring the displacement of a beam end. The device comprises a beam body 1, a beam body 2, an expansion and contraction system anda distributed displacement measurement system. The invention is connected with the embedded reinforcing bar in the beam body through the C-shaped steel and the U-shaped reinforcing bar on the supporting cross beam. As that beam body at both ends move relative to each other, the supporting beam pushes or stretches the top plate of the distribute displacement measuring system, causing the spring group to produce tension-compression deformation, and the tension-compression sensor can measure the internal force of each spring correspondingly, and convert the displacement of the beam end through awireless data transmission module. The movement of the supporting beam causes the I-shaped middle beam to move on it, and the bird-shaped rubber belt is compressed or stretched to realize the telescopic function. The invention has the advantages of simple structure and convenient installation, and can coordinate and analyze the monitored beam end displacement data with temperature and other data,and serves the bridge health monitoring field, can simultaneously evaluate the service state of the expansion joint, and improves the intelligent level of the bridge expansion joint and the bridge operation management level.

Description

technical field [0001] The invention relates to a novel bridge expansion joint device capable of monitoring beam end displacement, belonging to the technical field of bridge health monitoring. Background technique [0002] Bridge expansion joints can make the beam freely deform according to the design calculation diagram under the influence of temperature change, load action, foundation displacement, concrete shrinkage and creep, while ensuring smooth driving. With the advancement of transportation infrastructure construction, bridges are developing to large spans, which puts forward higher requirements on the performance of bridge expansion joints. The larger the span, the greater the requirement for longitudinal deformation of the beam body. Whether bridge expansion joints can work effectively directly affects traffic safety and driving comfort. The research shows that the cumulative longitudinal displacement of the beam end is an important reason for the premature failu...

AI Technical Summary

Problems solved by technology

[0004] Once the expansion joint is damaged, it will increase the impact of the vehicle load on the bridge. If it is not detected early, it will accelerate the damage of the bridge deck pavement and reduce the service life of the bridge.

However, most active bridge expansion joints have a single function and a low degree of intelligence, which makes it impossible to monitor beam end displacement and identify self-damage

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