随着城市经济的快速发展、交通量的不断增长,使得许多城市道路的平交口不能满足交通功能的需要,甚至成为了城市交通的“瓶颈”,而最经济简洁的解决办法就是采取主线上跨的形式,即跨线桥。而现代化城市对所处其中的桥梁在造型和构造上又提出了更高的要求,文章以105国道佛山顺德段的几座跨线桥为例,讨论了城市跨线桥的桥型设计问题。 With the rapid development of urban economy and the continuous increase of traffic volume, the crossroads of many urban roads can not meet the needs of transportation functions and even become the “bottleneck” of urban traffic. The most economical and concise solution is to adopt the principle of " The form, that is, overpass. The modern city put forward higher requirements on the shape and structure of the bridges in which the bridge is located. Taking the several cross-bridges of Shunde Section of Foshan-105 national highway as an example, the bridge design problems of urban flyover are discussed.