张靖皋长江大桥南航道桥主墩围堰施工关键技术  

Key technologies of cofferdam construction for main pier of south channel bridge of Zhangjiagang-Jingjiang-Rugao Yangtze River Bridge

作　　者：何文涛 黄修平[1,2,3] 付甦 庾焱秋[1,2,3] 朱润华 HE Wen-tao;HUANG Xiu-ping;FU Su;YU Yan-qiu;ZHU Run-hua(CCCC Second Harbor Engineering Co.,Ltd.,Wuhan,Hubei 430040,China;Key Laboratory of Large-span Bridge Construction Technology of Ministry of Communications,Wuhan,Hubei 430040,China;Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure,Wuhan,Hubei 430040,China)

机构地区：[1]中交第二航务工程局有限公司,湖北武汉430040 [2]长大桥梁建设施工技术交通行业重点实验室,湖北武汉430040 [3]交通运输行业交通基础设施智能制造技术研发中心,湖北武汉430040

出　　处：《中国港湾建设》2024年第3期80-85,共6页China Harbour Engineering

摘　　要：张靖皋长江大桥南航道桥主跨采用2300 m整体钢箱梁悬索桥,是世界最大跨径悬索桥。南塔采用世界首创超高钢箱-钢管约束混凝土组合索塔,基础承台采用八边形结构,结合桥位水文地质及设计要求,承台外围设锁扣钢管桩围堰作为施工围护结构,后期兼作大桥永久冲刷防护和船撞消能设施。施工过程中,采用履带吊+振动锤/冲击锤配合特制导向架隔孔施打的施工工艺,有效解决了超长锁扣钢管桩的施沉及合龙精度的难题;利用对撑加工成桁架整体安装、基底开挖及护筒围堰壁清理、分仓浇筑水下封底混凝土、导管底口铺设钢板等工艺,极大地降低了现场施工难度,保证了超大基坑水下封底混凝土的浇筑质量,为今后同类型深基坑施工提供了有益的借鉴。The main span of the south channel bridge of the Zhangjiagang-Jingjiang-Rugao Yangtze River Bridge is a 2300 m integral steel box girder suspension bridge,which is the world's largest span suspension bridge at present.The south tower adopts the world's first ultra-high steel box-steel pipe constrained concrete composite cable tower,and the foundation cap adopts an octagonal structure.In combination with the hydrogeology of the bridge site and design requirements,a lock buckle steel pipe pile cofferdam is set up around the cap as a construction enclosure structure,and later it will also serve as permanent erosion protection and ship collision energy dissipation facilities for the bridge.During the construction process,the construction process of using crawler crane+vibration hammer/impact hammer combined with special guide frame to drill into the spacing hole effectively solves the problems of the sinking and closing accuracy of the ultra-long lock buckle steel pipe pile;The use of techniques such as processing the support into a truss for overall installation,excavating the foundation and cleaning the cofferdam wall of the casing,pouring underwater bottom sealing concrete in separate warehouses,and laying steel plates at the bottom of the conduit greatly reduces the difficulty of on-site construction,and ensuring the pouring quality of underwater bottom sealing concrete for ultra-large foundation pits,which provides useful reference for the construction of similar deep foundation pits in the future.

关 键 词：桥梁工程 最大跨径悬索桥 超长锁扣钢管桩 特制导向架 桁架内支撑 分仓封底 

分 类 号：U655.541[交通运输工程—港口、海岸及近海工程] U445.556[交通运输工程—船舶与海洋工程]