A;;长大干线$桥梁工程

研究目的:在繁忙的铁路线上修建上跨立交桥,根据既要保证铁路的安全运营,又要考虑施工的顺利进行的特点,研究桥梁的设计中应该特别注意的问题,提出在适用不同线路条件下的桥梁结构形式,对日渐增多的跨线桥工程设计提供有益的借鉴。研究方法:结合上跨铁路立交桥的设计工点和设计经验,采用综合经济技术分析的研究方法。研究结果:从保证铁路安全运营的角度来综合考虑跨线桥的施工方法和结构设计,分别提出了适合于铁路区间和枢纽的常用桥跨方案。研究结论:位于铁路区间的桥跨结构采用预制架设法施工,适宜采用箱梁、T梁和空心板梁,位于铁路枢纽的桥跨结构采用转体、悬臂或顶推法施工,适宜采用斜拉桥、大跨刚构桥和钢混结合梁桥。

Research on Design of Railroad-overpass Bridge

Research purposes: For building overpass bridge over busy railway line,the following things should be taken into consideration specially in bridge design,namely making sure safe operation of the railway and smooth construction.The bridge structural styles available for different line conditions are presented for providing reference to more and more railroad-overpass bridge design.Research methods:The integrated method of economic and technical analysis is adopted based on the features and experience of design of railroad-overpass bridge.Research results:In view of taking construction method and making structural design of railroadoverpass bridge appropriately to guarantee the safe operation of the railway,the appropriate common schemes of overpass bridge available for railway section and terminal are presented.Research conclusions:For the bridge in railway section,it is adapted to use box beam,T beam and hollow slab beam and constructed by adopting precast erection method.For the bridge in railroad terminal,it is adapted to use cable-stayed bridge,large-span rigid frame bridge or composite steel and concrete beam bridge and constructed by adopting erection methods of swing,cantilever and jack-in.