北京市过去修建的桥,有一些因桥头填土下沉行车时产生跳动,下沉量大时上桥要减速,这不仅影响桥梁通过能力,而且会损伤汽车及桥梁。这个问题六十年代就已发现,从那时以来一直采用控制填土密实度及以后加做2.5m长的搭板措施,但没有根本解决,跳车处由桥合处移至搭板与路堤的接 In the bridges built in the past in Beijing, there were some beatings caused by the filling and sinking of bridgeheads, and the decelerations of the upper bridge when the sinking amount was large, which not only affected the capacity of bridges but also damaged cars and bridges. This problem was discovered in the 1960s and has since been followed by measures to control the density of the fill and the subsequent addition of a 2.5m long boarding plan. However, this has not been fundamentally solved, and the jumping vehicle moved from the bridge to the boarding and embankment The answer