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Causes of damage to bridge expansion joint device
Because the bridge expansion joint device is placed in the weak part of the beam end, it directly bears the repeated action of the vehicle load, and is exposed to nature and is affected by various natural factors. Therefore, the telescopic device is a vulnerable and difficult to repair part. . There are many reasons for the damage of the telescopic device. The main ones are:
1, poor design
At the time of design, the end of the beam was not carefully considered. Under the repeated load, the damage of the beam end caused the failure of the telescopic device. In addition, sometimes the amount of deformation is not properly calculated, and an excessively large telescopic pitch is used, resulting in breakage of the telescopic device.
2, expansion joint device itself problem
The strength of the telescopic device itself is insufficient to anchor the anchored components, resulting in varying degrees of damage during operation.
The post-casting and filling materials of the telescopic device are not taken seriously and carefully selected, resulting in a decline in the operational quality of the telescopic device and various degrees of disease. 
4. Construction and pouring of expansion joints
During the construction process, the spacing of the expansion joints of the beam ends was not completed according to the design requirements, artificially enlarged and reduced, and the position of the positioning angles was incorrect, resulting in the expansion device not working properly. This will result in the following situation: because the seam distance is too small, the rubber expansion joint will jump due to the over-extension swell; due to the excessive sewing distance, the shear force under load and the inertia of the vehicle will loosen. The expansion joint rubber takes out the positioning angle and produces another type of jumper. During the construction, the anchoring steel of the telescopic device is not welded firmly, or the phenomenon of missing the embedded anchoring steel is omitted, which causes hidden danger to the expansion joint itself; the expansion device is not installed well during construction, and the expansion joint is not well placed after the bridge deck is paved. During use, the expansion joint is damaged under repeated loading.
5, continuous seam setting is not perfect
In order to reduce expansion joints, a large number of continuous beams or continuous bridge decks are used. Continuously stitching is required for the bridge deck continuously, and the setting of the continuous seam is not perfect enough, so that the continuous seam is damaged, and the bridge deck is jumped. At the continuous joint of the bridge deck, the width and depth of the deformed joint are not standardized enough and are not uniform, which also affects the normal work of the continuous seam to varying degrees.
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