重庆渝湘复线双堡特大桥主桥设计  

Design of Main Bridge of Shuangbao Bridge of Second Chongqing-Hunan Railway in Chongqing

作　　者：刘琪[1] 聂尚杰 丁少凌[1] 郑国徽 LIU Qi;NIE Shang-jie;DING Shao-ling;ZHENG Guo-hui(CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,China;Chongqing Second Chongqing-Hunan Highway Co.,Ltd.,Chongqing 401147,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,湖北武汉430056 [2]重庆渝湘复线高速公路有限公司,重庆401147

出　　处：《桥梁建设》2023年第S01期16-24,共9页Bridge Construction

基　　金：重庆市交通行业科学技术项目(KJXM2021-0966)。

摘　　要：重庆渝湘复线双堡特大桥主桥为2×405 m连续上承式钢管混凝土变截面桁架拱桥,矢跨比1/4.75,悬链线拱轴线,拱轴系数1.55。主拱圈由两幅拱肋和风撑组成。拱肋采用四肢格构式结构,单幅拱肋宽7.5 m,两幅拱肋横向中心距17.5 m。拱肋弦管采用Q390D钢,直径1400 mm,内灌C70自密实混凝土。风撑采用米字撑。拱上立柱采用双肢排架式空心矩形截面钢箱结构,桥面系采用连续钢-混组合梁,单跨27 m。中央拱座基础采用“浅挖拱座+桩基础”的构造形式,以适应岩溶发育区地质条件及降低连拱效应。拱肋采用900 m超长缆索吊装配合自平衡斜拉扣挂系统大节段吊装,桥面系采用地面组拼并张拉预应力、整体吊装的装配式施工方案。The main bridge of Shuangbao Bridge carrying a section of the Second Chongqing-Hunan Highway is a deck-type concrete-filled steel tubular truss arch bridge with two continuous spans of 405 m.The rise-to-span ratio and arch axis coefficient are 1/4.75 and 1.55,respectively,creating a catenary arch.The arch consists of two 7.5 m-wide arch rings and Warren-type wind bracings,and the two arch rings are spaced center-to-center at 17.5 m,each formed of four latticed frames.Made of Q390D steel,the chords of arch rings have a diameter of 1400 mm and are filled with C70 self-consolidating concrete.The bent spandrels are composed of steel box members of void rectangular cross-section.The deck system consists of steel girders and concrete deck slabs that cover the full spans of 27 m.The central arch seat is shallowly buried and supported on piles,to address the Karst terrain and combat continuous arch effect.The arch rings were divided into large segments to be erected by a self-balanced cable-stayed cantilever assembly system with 900 m-long cableways.The components of the deck system were first assembled on the ground,with prestressing tendons tensioned,and then integrally hoisted into position.

关 键 词：钢管混凝土拱桥 桁架拱 双跨连续拱桥 主拱圈 四肢格构式断面 中央拱座 超长缆索吊装 桥梁设计 

分 类 号：U448.224[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]