铜陵公铁两用长江大桥主桥设计  

Design of Main Bridge of Tongling Changjiang River Rail-cum-Road Bridge

作　　者：张强[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》2014年第3期7-12,共6页Bridge Construction

摘　　要：铜陵公铁两用长江大桥主桥为(90+240+630+240+90)m的五跨连续钢桁梁斜拉桥,该桥上层桥面布置6车道高速公路,下层桥面布置4线铁路,主梁纵向采用飘浮体系,主梁和桥塔下横梁间设置阻尼装置。主梁采用3片主桁,N形桁架,主桁采用全焊桁片式设计,公路和铁路桥面均采用密布横梁的正交异性整体钢桥面,下层桥面在受力较大的桥塔根部及压重区段采用箱形结构,每个竖杆处均设有三角形桁架式横联;桥塔为倒Y形C50混凝土结构,承台以上桥塔高212m;斜拉索采用三索面布置,桥塔两侧各布置3×19根钢绞线斜拉索。除深水区3号桥塔墩采用沉井基础外,其余主墩均采用桩基础,沉井基础为圆端形,上部18m采用混凝土结构,下部50m采用钢结构。The main bridge of Tongling Changjiang River Rail-cum-Road Bridge is a five-span continuous steel truss girder cable-stayed bridge with span arrangement （90 ＋ 240 ＋ 630 ＋ 240 ＋ 90） m. The upper deck of the bridge carries 6-lane expressways while the lower deck carries 4- track railways. Longitudinally, the main girder is designed as the one of floating system and in between the main girder and the pylon lower cross beams, the damping devices are arranged. The main girder is comprised of 3 N-shape main trusses and the main trusses are all of the all-welded truss units. For both the roadway and railway decks of the bridge, the monolithic orthotropic steel decks with densely arranged cross beams are employed. In the area close to a pylon and of the counterweight section that is subjected to tremendous force, the box structure is employed for part of the lower deck. At each vertical member, the triangle truss lateral bracing is arranged. The pylons of the bridge are the inverted Y-shape C50 concrete structures and the height of a py- lon above the pile cap is 212 m. The stay cables are arranged in three cable planes and at each side of a pylon, 3× 19 steel strand cables are arranged. With the exception that the foundation for the pylon pier No. 3 in the deepwater area is of the open caisson foundation, the foundations for the rest of the piers are all of the pile foundations. The caisson is a round-end caisson, of which the upper 18 m part is the concrete structure while the lower 50 m part is the steel structure.

关 键 词：铁路公路两用桥 钢桁梁 上部结构 下部结构 沉井基础 桩基础 结构设计 桥梁设计 

分 类 号：U448.121[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]