Bridges are like the throat of road, whose function has direction effect on the smoothness of the road. At present, due to the limitation of bridge construction, the objective factors including design, construction and material bring big obstacles to highway transportation. What's more, the rapid increasing of traffic volume especially the conflict between the highway trunk line old bridge's bearing capability and the vehicle load make the highway trunk line old bridge reinforcement technology extremely urgent. This article mainly analyzes the causes of highway bridge disease and proposes reasonable reinforcement method so as to keep the old bridge in good condition.%桥梁可谓公路交通之咽喉，其使用功能的好坏直接影响到主干线路的畅通。目前一些主干线公路因受到建桥时的局限，设计、施工、材料等诸多方面的客观因素，给公路运输事业发展带来很大约束，加之不能满足目前交通量快速增长，尤其是主干线公路旧桥的承重能力与经由的车辆荷载存在的矛盾，导致主干线公路旧桥检测与加固改造技术则显得非常紧迫。本文主要分析公路旧桥病害原因，提出合理的改造加固措施方案，促使公路旧桥保持良好的使用状态。
展开▼
