重载铁路高墩大跨简支桥梁技术经济比选

Technical and Economic Comparison on Heavy-loaded Railway Simply-supported Girder with High Pier and Large Span

研究目的:蒙西至华中地区煤运通道三荆段城烟特大桥位于低山沟谷,桥梁分别跨越灞底河、三淅高速公路以及G209国道,桥梁墩高在50-70 m。采用常规32 m简支梁方案具有高墩林立、下部结构工程量大的缺点。通过对32 m简支T梁及48 m、56 m、64 m简支箱梁方案分别进行受力分析计算以及经济性能比较,拟找到技术性能、经济性能最优的桥跨方案。研究结论:(1)32 m简支T梁和64 m简支箱梁方案的经济性能最优,64 m简支箱梁方案的受力性能良好,技术先进,并且避免了小跨度简支梁高墩密布的现象,景观效果最优,是最优方案;(2)大跨度简支梁采用节段预制移动模架拼装的建造方法,具有施工技术先进、质量容易控制、施工周期快的特点;(3)本研究成果可为铁路高墩桥梁的建设提供参考和借鉴,具有应用推广价值。

Research purposes : Chengyan Bridge, on Mengxi-Huazhong Heavy-loaded Railway Sanjing Section for coal transportation, is located in a deep valley. The bridge goes across Yuebadi River, Sanmenxia-Xichuan Highway and G209 National Road. The piers of the bridge are about 50 m-70 m high. The 32 m simply-supported girder scheme has the disadvantages of high piers and larger engineering quantity. To select the most suitable girder scheme,calculation, analysis, technical and economic comparison are done from 32 m simply-supported T-girder, 48 m,56 m and 64 m simply-supported box girders schemes.Research conclusions :(1) The 32 m simply-supported T-girder and 64 m simply-supported box girder are the best solutions for economic consideration. 64 m simply-supported box girder has a good mechanical performance and advanced technology. Using 64 m simply-supported box girder for Chengyan Bridge also avoids the phenomenon of dense high piers with small span, and the landscape effect is the best, which is the best scheme.(2) The long-span simple-supported girder adopts the construction method of segmental prefabricated movable formwork, with advanced construction technology, easy quality control and fast construction period.(3) The research results can provide reference for the construction of railway bridges with high pier, and have good application and promotion value.