黄冈公铁两用长江大桥主跨567m钢桁梁斜拉桥设计  

Design of Steel Truss Girder Cable-Stayed Bridge of 567-m Main Span of Huanggang Changjiang River Rail-cum-Road Bridge

作　　者：李卫华[1] 杨光武[1] 徐伟[1] 

机构地区：[1]中铁大桥勘测设计院集团有限公司,湖北武汉430056

出　　处：《桥梁建设》2013年第2期10-15,共6页Bridge Construction

摘　　要：黄冈公铁两用长江大桥主桥采用(81+243+567+243+81)m连续钢桁梁双塔斜拉桥,半飘浮结构体系,上层布置4车道高速公路,下层布置双线铁路。主梁采用上宽下窄的倒梯形截面,腹杆倾斜设置(斜率达1∶2.7),主桁采用正N形桁式结构。公路桥面采用纵、横梁支撑正交异性整体钢桥面结构;铁路桥面采用多横梁支撑正交异性整体钢桥面结构;每个主桁上弦节点处均设有横向联结系。桥塔为H形钢筋混凝土结构。斜拉索为空间双索面,桥面锚固系统内置于主桁上弦杆内。该桥采用悬臂散拼法架设,为解决斜主桁悬臂架设的技术难题,腹杆在节点外拼接。The main bridge of Huanggang Changjiang River Rail-cum-Road Bridge is a contin-uous steel truss girder cable-stayed bridge with double pylons and with span arrangement （81 4＋243＋567＋243＋81） m and is a cable-stayed bridge structure of semi-floating system. The upper deck of the bridge carries 4-lane expressway and the lower deck carries double-track railway. The main girder is of the inverted trapezoidal section that is wide at the upper part and narrow at the lower part, the webs members are inclinedly set with the inclination ratio being 1 ： 2.7 and the main trusses are designed as the ones of normal N-shape. For the roadway deck, the deck is the integral orthotropic steel deck supported on the stringers and cross beams while for the railway deck, the deck is also the integral orthotropic steel deck, but is supported on the multiple cross beams. At the upper chord panel points of each main truss, the lateral bracings are set. The py-lons of the bridge are the H-shape reinforced concrete structures. The stay cables are arranged in-to the spatial double cable planes. The anchoring systems of the cables at the deck level are set in the upper chords of the main trusses. The bridge is erected by the cantilever erection method of piece-by-piece assembling. To cope with the difficulties of the cantilever erection of the inclined main trusses, the web members are assembled and connected outside the panel points.

关 键 词：斜拉桥 公路铁路两用桥 钢桁梁 倒梯形截面 钢锚箱 桥梁设计 

分 类 号：U442.5[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]