石首长江公路大桥主桥总体设计  

Overall Design of Main Bridge of Shishou Changjiang River Highway Bridge

作　　者：陈虎成[1] 张家元 刘明虎[1] 丁望星 沈昊[1] 

机构地区：[1]中交公路规划设计院有限公司,北京100088 [2]湖北省交通规划设计院股份有限公司,湖北武汉430051

出　　处：《桥梁建设》2017年第5期6-11,共6页Bridge Construction

摘　　要：石首长江公路大桥主桥为(75+75+75)m+820m+(300+100)m的单侧混合梁斜拉桥,半飘浮结构体系。主梁采用钢箱梁与预应力混凝土梁组成的混合梁,分离式双箱断面,全宽38.5m。钢箱梁顶板横桥向变厚,设实腹式横隔板;预应力混凝土梁采用短线法预制;钢-混结合段采用带钢格室的部分连接填充活性粉末混凝土构造。南、北桥塔高分别为234m、232m,基础均采用直径2.5m的群桩基础,由于地质条件差,桩端采用后压浆技术提高承载力。索-塔锚固采用钢锚梁方案,钢牛腿壁板与塔壁结合采用开孔板连接件。斜拉索采用标准强度1 770 MPa的平行钢丝,外置式阻尼器采用杠杆质量减振器LMD。The main bridge of Shishou Changjiang River Highway Bridge is an one-side hybrid girder cable-stayed bridge with span arrangement（75＋75＋75）m＋820 m＋（300＋100）m and is designed into the one of the semi-floating structural system.The main girder of the bridge is the hybrid girder comprised of the steel box girder and prestressed concrete box girder.The cross section of the main girder is the separated twin boxes and the full width of the girder is 38.5 m.The top plate of the steel box girder is thickened gradually in the transverse direction of the bridge and in the box girder,the solid diaphragms are arranged.The prestressed concrete box girder is to be cast,using the short line match method.In the joint section of the steel and concrete box girders,the structure of the steel cells that are to be partially connected by filling the reactive powder concrete is provided.The height of south and north pylons is respectively 234 mand 232 m.The foundations for the pylons are the group piles of diameter 2.5 mand because of the poor geologic conditions at the bridge site,the bearing capacity of the piles is to be improved by post grouting at the bases of the pile tips.The anchorages for the stay cables in the pylons are the steel anchor beams and the wall plates of the steel corbels and pylon walls in the anchorage zones are connected,using the perforated plate connectors.For the stay cables of the bridge,the parallel steel wires of the standard strength of 1 770 MPa are used.The external dampers provided for the cables are the lever mass dampers.

关 键 词：斜拉桥 公路桥 半飘浮结构体系 混合梁 钢箱梁 桥塔 斜拉索 桥梁设计 

分 类 号：U448.27[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]