What is "bridge jump"?

Nowadays, China's road construction is becoming more and more developed, especially the construction of expressways is developing rapidly. But the phenomenon of “jumping at the bridgehead” is not uncommon. The so-called “bridge jump” refers to the phenomenon that the entire surface of the bridge at the two ends of the bridge and the bridge sinks relative to the deck, resulting in a faulty stage and causing the passing vehicle to jump up and down.

There are many reasons for this phenomenon. The main reason is that construction is unfavorable, including the construction materials are not closed, the joints are not handled well, etc. In addition, if the drainage facilities are not up to the standard, it will cause the loss of filling, and the long-term repeated Under load, the embankment will be differentially settled, resulting in a bridgehead jump. There is a large amount of research and analysis that shows that the most likely reason for the “bridge jump” is that the compactness of the bridge foundation is not enough. After the completion of the main structure of the bridge, workers will start to work on the roadbed at the bridgehead. This will lead to insufficient consolidation of road foundations due to road maintenance . In addition, the bridge construction site is small, and large-scale construction machinery is not easy to deploy. This objective condition greatly increases the difficulty of the work and makes it difficult for the bridgehead embankment to meet the standard requirements. What we need to do is to reduce the differential settlement of embankment and abutment, maintain the road surface , and eliminate the phenomenon of bridgehead jumping.

What measures can we take? The most commonly used measure for pavement maintenance is to do joint processing first, then use a hair dryer, use a steel brush to thoroughly clean the grassroots, and then use an asphalt sprinkler to spray the sticky layer of oil, and then finally work on the asphalt concrete. In the last work, it should be noted that the paving speed must be uniform and slow, not too fast or too slow, and the vibration frequency of the paver beater should be adjusted so that the initial compaction can reach 85% or more. We can also solve the phenomenon of bridgehead jumping by setting bridges. Its basic principle is believed to be known by everyone. It is through bridges that the transition between embankment filling and abutment structures is gradual. Although this method cannot maintain good results for a long time, it can solve the crisis when it comes to unexpected situations.

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