桥头跳车是公路桥头及桥梁伸缩缝处由于差异沉降或伸缩缝装置破坏而使路面出现显著的纵坡变化(统称台阶),从而导致车辆通过时产生跳跃的现象。桥头跳车是公路建设质量通病中的顽症,高速公路桥头跳车尤为值得注意,因为高速公路重车多、车速快,车辆通过时会跃起数十厘米高,存在很大的事故隐患,对路面、路基和桥梁构筑物产 The bridgehead jumping is a significant change of the longitudinal gradient of the road surface (collectively referred to as steps) due to differential settlement or expansion joints at the bridgeheads of bridges and bridges. As a result, the vehicles may jump when they pass through. The bridgehead jumping is a chronic problem in the quality of highway construction. It is particularly noteworthy that the bridgehead jumping on the expressway is worth noting because the highway is heavy in weight and fast in speed. When the vehicle passes, it leaps tens of centimeters high and there is a big accident risk. Pavement, subgrade and bridge construction property