重庆土湾大桥主桥方案设计  

Design of Main Bridge of Chongqing Tuwan Bridge

作　　者：孟杰[1,2] 陈晓虎 邓宇 赖亚平 MENG Jie;CHEN Xiao-hu;DENG Yu;LAI Ya-ping(School of Civil Engineering,Southeast University,Nanjing 210096,China;T.Y.Lin International Engineering Consulting(China)Co.,Ltd.,Chongqing 401121,China)

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]林同棪国际工程咨询(中国)有限公司,重庆401121

出　　处：《桥梁建设》2021年第1期101-108,共8页Bridge Construction

基　　金：重庆市院士牵头科技创新引导专项项目(cstc2017zdcy-yszxX0003)。

摘　　要：重庆土湾大桥为城市公轨两用桥,结合该桥建设条件,经比选,采用跨径布置为(95+90+690+90+95)m的斜拉-自锚式悬索协作体系桥梁。主桥中跨采用正交异性钢桥面板桁架结构,边跨采用叠合混凝土桥面板桁架结构,钢-混结合段区域正交异性钢桥的U肋间增加了板式加劲肋进行刚度过渡。主桁标准节段长为15m,2片桁横向间距为14.7m,桁高13.19m。梁端设置混凝土主缆型钢锚固系统。大桥中跨中央225m范围内主桁由16对主缆吊索支撑,其余主桁由斜拉索(共28对)支撑。下部结构采用钻石形桥塔,塔高197m,圆端形承台接群桩基础。主桥边跨桁架采用顶推施工,中跨桁架采用临时拉索悬臂施工。主缆吊索区先施工直至主桁合龙,再通过体系转换完成主缆架设。The Chongqing Tuwan Bridge was expected to be a road-light rail bridge.Given the construction condition,a solution of combined cable-stayed and self-anchored suspension system was determined.The bridge has five spans of 95,90,690,90and 95m.The deck of the central span consists of steel trusses and orthotropic steel plates,and the decks of the side spans are formed of steel trusses and concrete slabs,with section steel-concrete composite anchorages for the main cables at the deck ends.In the steel-concrete joint zone,plate stiffeners are added between the orthotropic steel plates and U ribs for stiffness transition.The trusses are measure 13.19min depth and two lateral trusses are distanced 14.7malong bridge width.Typical truss segments are 15mlong.The 225m-long steel trusses in the midspan of central span are supported by 16pairs of hanger cables,and the remaining steel trusses are supported by stay cables(totaling 28pairs).The towers are diamond-shaped towers rising 197m,seated on round-cornered pile caps that are supported by group pile foundations.The trusses in side spans were constructed by incremental launching,and the trusses in central span was constructed by cantilever assembly,taking advantage of the stay cables.The steel trusses in the hanger cables region were first assembled to the closure of the main truss,and then the systematic transformation was conducted to complete the erection of the main cables.

关 键 词：公轨两用桥 斜拉-自锚式悬索协作体系 钢桁梁 桥塔 主缆 斜拉索 桥梁设计 

分 类 号：U448.12[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]