城市桥梁L形盖梁的病害及维修措施

Defects and Maintenance Measures of L-shaped Bent Cap of Urban Bridge

受桥下道路、地形及附近构筑物等影响,在桥梁布跨时经常采用不等跨径形式来跨越不同的障碍物。对于桥梁轴线两侧跨径不相等的桥梁,通常轴线两侧主梁的梁高也不同,因此在公用墩处设置L形盖梁也是不可避免的。近些年,该种L形盖梁连续出现倾斜、堵塞及裂缝等病害,严重时影响桥梁安全运营。结合实际桥梁工程,阐述了L形盖梁典型病害成因并采用有限元方法进行验证,最终提出相应的维修加固措施,相关经验可为该类桥梁的维修加固设计提供借鉴。

Affected by the road,terrain and nearby structures under the bridge,the unequal span layouts are adapted to cross different obstacles when the span of bridges are arranged.Bridges,that spans on both sides of the bridge axis are unequal,usually have different girder heights so that L-shaped capping beams are inevitable set at the common pier.In recent years,continuous diseases such as inclinations,blockages and cracks happened at the above L-shaped capping beams and seriously affects the safe operation of bridges.Taking the existing bridge as an example,the causes of defects of L-shaped capping beam are explained and tested by the finite element analysis.The corresponding measures of maintenance and reinforcement are put forward and provide reference for similar bridge design of repair and reinforcement.