重庆新田长江公路大桥设计  

Design of Xintian Changjiang River Highway Bridge in Chongqing

作　　者：王志诚 宋颖彤[2] 李鸿盛[3] 郭斌强 WANG Zhicheng;SONG Yingtong;LI Hongsheng;GUO Binqiang(Southeast University,Nanjing 211189,China;CCCC Highway Consultants Co.,Ltd.,Beijing 100010,China;Chongqing Wanzhou Expressway Co.,Ltd.,China First Highway Engineering Company,Chongqing 404100,China;Zhejiang Institute of Communications Co.,Ltd.,Hangzhou 310030,China)

机构地区：[1]东南大学,江苏南京211189 [2]中交公路规划设计院有限公司,北京100010 [3]中交一公局重庆万州高速公路有限公司,重庆404100 [4]浙江数智交院科技股份有限公司,浙江杭州310030

出　　处：《桥梁建设》2024年第5期133-139,共7页Bridge Construction

基　　金：国家重点研发计划项目(2021YFB1600304)。

摘　　要：重庆新田长江公路大桥主桥采用跨径1020 m的双塔单跨钢箱梁悬索桥,一跨过江。该桥加劲梁采用扁平流线型钢箱梁。桥塔采用门形混凝土塔,高峰侧桥塔采用塔肢不等高设计,上游塔肢高169.5 m,下游塔肢高153.5 m;新田侧桥塔高169.5 m。桥塔基础均采用分离式承台+大直径桩。两岸重力式锚碇采用空间异形结构、扩大基础,锚碇锚固系统采用无粘结镀锌钢绞线拉索。主缆采用标准抗拉强度1860 MPa的预制平行钢丝索股,吊索采用标准抗拉强度1670 MPa的平行钢丝索股,边跨及主跨跨中部分索夹采用焊接式索夹,其余采用铸造式索夹。引桥上部结构采用30 m跨径预应力混凝土T梁,下部结构采用大直径桩+大直径柱。高峰侧引桥上方的陡崖带采用支撑、清除、锚固等措施进行处治,新田侧桥塔前缘顺层边坡采用抗滑桩支挡。钢箱梁梁段采用工厂制造、水上运输、现场安装的施工方案,其中岸坡区钢箱梁采用空中连续荡移架设。The main bridge of Xintian Changjiang River Highway Bridge in Chongqing is a two-tower suspension bridge featuring a suspended main span of 1020 m,with no piers standing in the Changjiang River.The stiffening girder consists of flat streamlined steel box girders.The towers are portal-frame structures,the Gaofeng-side tower has an upstream column and a downstream column measuring 169.5 m and 153.5 m high,respectively,while the Xintian-side tower rises 169.5 m.The tower foundations involve large-diameter piles,and each tower column rests on an independent pile cap.The main cables are anchored by the spatial,irregular gravity anchorages that are mounted on spread foundations,inside which the unbonded galvanized steel-strand cables constitute the anchor system.The main cables are composed of prefabricated parallel steel wires with nominal tensile strength of 1860 MPa,the hanger cables consist of parallel steel wires with a nominal tensile strength of 1670 MPa,the cable clamps in the side spans and at mid main-span are welded clamps,and the remaining clamps are cast clamps.The approach bridges are arranged in 30 m-long spans of prestressed concrete T girders,with substructures of large-diameter piles and piers.The steep rock over the Gaofeng-side approach bridge was treated by shoring,clearing debris and strengthening.The consequent slope against front edge of Xintian-side tower was strengthened by anti-slide piles.The steel box girder segments were fabricated in the factory,shipped to bridge site for assembly.The steel box girders for the bank slope zones were swung into position.

关 键 词：悬索桥 钢箱梁 门形塔 重力式锚碇 扩大基础 焊接式索夹 施工方案 桥梁设计 

分 类 号：U448.25[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]