跨越通航河流的大跨度连续刚构桥改扩建设计时,必须满足现行规范及河道通航等级提升的要求,以一高速公路大跨度连续刚构桥扩建工程为对象,通过对原有桥梁的检测评估、荷载试验及承载力验算,进行了桥梁改扩建的方案比选及优化,明确了改扩建设计方案,并对旧桥的加固设计及新建桥梁设计进行了研究,对相应桥梁的扩建工程有一定的参考借鉴作用。 The design of large-span continuous rigid-frame bridge across navigable river must meet the current norms and requirements of river navigation grade upgrading. Taking the expansion project of a long-span continuous rigid frame bridge of an expressway as an object, , Load test and bearing capacity check, the comparison and optimization of the bridge expansion and expansion program, a clear expansion of the design program, and the reinforcement design of the old bridge and new bridge design were studied, the corresponding expansion of the bridge there is a certain Reference for reference.