S219永定线大林淮河桥桥墩冲刷分析及加固

Analysis on Bridge Scour and Strengthening of Dalin Huai River Bridge of S219 Provincial Highway

针对省道S219永定线大林淮河桥的桥墩冲刷问题,按一般冲刷和局部冲刷叠加计算冲刷深度,确定桥墩冲刷对桩基础竖向承载力的影响,并对单桩承载力进行了验算,计算证明需加固河床。根据现场实际情况,考虑石笼耐冲刷和浆砌片石不容易被人为破坏的优点,抗冲刷加固的综合效果较好,推荐采用石笼和浆砌片石的加固方案。从近年实践情况来看,防护效果较好。

Aimed at the problem of bridge scour that happens to the Huai River Bridge in Dalin of S219 provincial highway, the effect of bridge scour on the vertical bearing capacity of pile foundation was determined by combining the calculation of the depths of general and local scour. The bearing capacity of single pile was calculated and checked to prove the need to strengthen the river bed. Considering the actual situation of the site, the combination of stone cage and mortar flagstone was recommended because of their respective advantages of the resistance to scouring and not easy to be vandalized. The protection effect has been proved by the performance in recent years.