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某山区高速公路汉江特大桥位于国家Ⅰ级水源保护库区,环保要求高,且水库蓄水后通航等级要求较高,因而制约该桥方案选定的因素较多。文中重点介绍该桥的方案比选过程,先后讨论了连续刚构方案、矮塔斜拉桥方案、斜拉桥方案的优缺点和适应情况,通过比选得出矮塔斜拉桥是比较经济、合适的桥型。
A mountain highway Hanjiang River Bridge is located in the national I-level water source protection of the reservoir area, environmental requirements, and the reservoir storage requirements of navigable grade higher, thus restricting the design of the bridge more factors. The article focuses on the process of comparison and selection of the bridge, has discussed the continuous rigid frame program, the short pylon cable-stayed bridge program, the advantages and disadvantages of the cable-stayed bridge and adapt to the situation, obtained by comparing the short pylon cable-stayed bridge is more economical , Suitable bridge type.