2014年6月上第43卷第11期
DOI:10.7672/sgjs2014110031
施工技术
CONSTRUCTION TECHNOLOGY
新白沙沱长江特大桥主桥3号主塔墩基础施工技术
李艳哲
（中铁大桥局集团第一工程有限公司，河南郑州450053）
沱长江大桥主桥水中3号主塔墩基础采用先平台后围堰方案施工，适应实际情况。阐述了大面积水下、水上岩面爆破清理技术研究应用，水下河床快速测量技术，平台的整体拼装浮运提升技术，大直径深水钻孔桩清水成孔技
技术研究及运用效果。最终确保基础施工达到安全、优质快速、缩短工期、减少成本的目的。【关键词］桥梁工程；斜拉桥；主塔墩；同步拼装；施工技术
［中图分类号］U445.55
【文献标识码］A
［文章编号】1002-8498（2014)11-0031-05
Foundation Construction Technology of No.3MainTower Pier for
NewBaishatuo YangtzeRiver Bridge
LiYanzhe
(The First Engineering Co. ,Lid. , China Railaeay Major Bridge Engineering Group, Zhengzhou, He'nan 450053, China) Abstract:This paper introduces foundation construction of No. 3 main tower pier of New Baishatuo Yangtze River Bridge, which is in river and close to existing railway, not only faces complex external environmental conditions such as hydrology, geology and site, but also faces very short construction period and difficult construction technology. To adapt to the actual situation, the construction platform was built first, then the cofferdam was built. This paper introduces some construction technologies used for the foundation of No. 3 main tower pier, such as rock blasting technology in water in a large area, fast measurement technology in water, floating and installation technology for the whole construction platform, the technology for boring large diameter bored pile with little slurry, the technology for installing large steel box cofferdam synchronously over the rough rock in water, the technology for preventing leakage of large steel box cofferdam in water. This paper summarizes the construction technology which is used for the foundation of No. 3 main tower pier and application results. Based on the above technologies, the bridge was built safely, fast and high-quality, the purpose for shortening the construction period and reducing costs was realized.
Key words : bridges ; cable stayed bridges ; main tower piers ; synchronous assembly ; construction
1工程概况
新建白沙沱长江特大桥上距已建川黔铁路白沙沱铁路桥130m，距某水泥厂专用公路桥约 2.3km。桥位下游1.3km，为规划小南海水利枢纽坝址，其主桥为六线连续钢桁梁斜拉桥，跨度组成为（81+162+432+162+81）m，桥梁全长920.4m，主桥渝黔客线、渝湘通道、渝黔货线合建段0~5号
*中铁大桥局科研项目（桥经[2013】148号）：双层六线大跨度重载铁路斜拉桥建造技术研究
【作者简介】李艳哲，教授级高级工程师，E-mail；zlyz@126.com【收稿日期］2013-11-22
31
墩。上层桥面为渝黔客车线双线、预留渝湘通道双线，下层桥面为渝黔引人货车线双线。桥梁横断面如图1所示。
主桥2~4号墩基础位于水中，施工期间水位变化较大，枯水期4号墩经筑岛后可位于陆地岸滩上，洪水期则被水淹没，需合理安排工期组织施工。2，3 号墩为主塔墩，控制全桥总工期，3号主墩位于江中，基础施工是本桥施工的重点与难点。
主桥3号墩共36根Φ3.2m桩基，横桥向布置9 排（间距7.2m），纵桥向布置4排（间距8.5m），最