米家园则榆溪河特大桥桥式方案比选

包西铁路通道属包柳通道的组成部分，是陕北、内蒙古中西部与西南、华东、中南、关中及陕南等地区客货交流的便捷通道。米家园则榆溪河特大桥为包西铁路通道重点工程之一，该桥桥高55m，先后跨越榆溪河、国道G210、灌渠等。此桥桥址位于风积沙及黄土台塬区，部分桥梁位于古煤窑采空区，地质相对复杂，控制因素多，设计难度大。此文通过桥式方案比选，从梁部结构的选用、施工难易程度、水文条件优劣及工程造价高低等多方面进行综合比较，选择出较为合理的桥式方案。

Comparison of bridge type schemes for Yuxihe extra-long bridge at Mijiayuanze

Bao - Xi railway corridor is a component part of the Bao - Liu corridor, and also a convenient and rapid corridor for passenger and freight exchanges between the areas of northern shaanxi, and central west of Inner Mongolia and the areas of South - west China, East China, Central South China, Guanzhong and southern Shaanxi. The Yuxihe extra - long bridge at Mijiayuanze is one of the priority items on the Bao - Xi railway corridor. It is of 55 m high and successively crosses over the Yuxi River, G210national highway, irrigation channels, etc. The site of the bridge is located in the anemoarenyte and loess plateau area with part of the bridge lying in the worked - out section of old coalmines. It is of complicated geology and quite a few control factors making the design difficult. In this article, through the comparison of bridge type schemes, in which a comprehensive comparison is made from the adoption of girder structure, the degrees of difficulty in construction, hydrological conditions to the construction cost, a comparatively reasonable bridge type scheme is finally opted..