The agent of bridge bearing manufacturer analyzes the causes of bridge expansion joint damage

The expansion joint device of the bridge is set at the weak part of the beam end structure, which directly bears the repeated action of the vehicle load and is mostly exposed to the nature. Affected by various natural factors, the expansion joint device is easy to be damaged. Generally speaking, the damage of bridge expansion joints is caused by poor design, problems of the device itself, improper selection of post-pouring and pressure filling materials, unreasonable construction and other factors. Therefore, the expansion joints are easily damaged and difficult to repair. There are many reasons for the damage of the telescopic device.

What is the cause of bridge expansion joint damage? The agent of bridge bearing manufacturer will show you:

1. When the bridge expansion joint is not designed properly, the beam end is not carefully considered. Under the repeated load, the damage of the beam end causes the failure of the expansion device. In addition, sometimes the calculation of deformation is not appropriate, and the expansion spacing is too large, resulting in the damage of the expansion device.

2. The expansion joint device has its own problems. The structural rigidity of the expansion joint device itself is insufficient. The strength of the anchored components is insufficient, resulting in different degrees of damage during operation.

3. Improper selection of post-pouring and pressure filling materials for the expansion device did not take the post-pouring and pressure filling materials seriously and carefully selected, resulting in the decline of the operation quality of the expansion device, resulting in different degrees of disease.

4. In the process of unscientific and reasonable construction, the spacing of expansion joints at the beam end was not completed according to the design requirements, artificially enlarged and reduced, and the positioning angle steel position was incorrect, resulting in the expansion device not working properly. In this way, the following situations will occur: due to the small gap, the rubber expansion joint will bump due to over-limit extrusion; Due to the large joint spacing, the shear force under the load and the inertia of the vehicle driving will bring the loose expansion joint rubber out of the positioning angle steel, resulting in another type of car bump. During construction, the anchoring reinforcement of the expansion device is not welded firmly enough, or the phenomenon of missing the embedded anchoring reinforcement occurs, causing hidden danger to the expansion joint itself; The installation of expansion devices during construction is not good, and the pouring of expansion joints after deck pavement is not good. During use, the expansion joints are damaged under repeated loads.

5. The setting of continuous joints is not perfect. In order to reduce expansion joints, a large number of continuous beams or continuous bridge decks are now used. Continuous joint is required for continuous bridge deck. At present, the setting of continuous joint is not perfect enough, resulting in damage of continuous joint, resulting in bridge deck bump. At the continuous joint of the bridge deck, the width and depth of the deformation false joint are not standardized and unified enough, which also affects the normal operation of the continuous joint to varying degrees. It can be seen from the above that there are many reasons for the damage of the bridge expansion joint. Once the bridge expansion joint is found to be damaged, it is necessary to find out the cause of the damage in time to repair it, or find a repair team to repair it, because the damage of the bridge expansion joint device not only causes bumps and noise nuisance, but also more seriously endangers the safety of the bridge.