重庆朝天门长江大桥主桥钢梁安装设计  

INSTALLMENT DESIGN OF STEEL GIRDER OF MAIN BRIDGE OF CHAOTIANMEN YANGTZE RIVER BRIDGE IN CHONGQING

作　　者：康晋[1] 段雪炜[1] 徐伟[1] 

机构地区：[1]中铁大桥勘测设计院有限公司,武汉430056

出　　处：《钢结构》2011年第3期65-67,61,共4页Steel Construction

摘　　要：重庆朝天门长江大桥主桥采用(190+552+190)m中承式连续钢桁系杆拱桥结构,为双层桥面布置的公轨两用大桥,也是世界上跨度最大的拱桥。主梁边跨采用临时墩辅助的伸臂法架设,中跨采用扣索塔架辅助伸臂安装,先合龙主拱,再合龙系杆。主桁杆件的设计与安装步骤及控制工况息息相关,需要确定各个施工工况下扣索及临时系索的索力、保证悬臂倾覆稳定需要的最小压重量、为实现合龙而对支点施加的纵移量及竖向顶落量。The main bridge of Chaotianmen Yangtze River Bridge in Chongqing is a half-through continuous steel truss tied arch bridge structure with span arrangement（190＋552＋190） m designed as a double-deck highway and light-railway cable stayed bridge and is a longest arch bridge in the world.The side spans of the main girder are cantileveredly erected by the aid of the temporary auxiliary piers.The mid span is cantileveredly erected by the aid of the fastening stay towers,in which the girder is to erected first,the arches to be erected late.The main truss member design is closely linked with the construction steps and control modes.Under each construction stage tension of fastening stayed cable and temporary tied cable,the minimum pressure weights needed in order to guarantee the anti-tilts stability,displacement values of supports in vertical direction in order to realize the closure of truss are determinated in installment compution.

关 键 词：钢桁系杆拱 伸臂法 扣索 临时系索 桥梁设计 安装设计 

分 类 号：U445.58[建筑科学—桥梁与隧道工程]