伶仃洋大桥东主塔大型下横梁施工围堰与支架组合结构设计  

Design of cofferdam-support combined structure for large-scale lower beam construction of Lingdingyang Bridge

作　　者：黄修平[1,2] HUANG Xiu-ping(CCCC Second Harbor Engineering Co.,Ltd.,Wuhan,Hubei 430040,China;Key Laboratory of Large-span Bridge Construction Technology,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

出　　处：《中国港湾建设》2021年第7期55-60,共6页China Harbour Engineering

摘　　要：依托深中通道伶仃洋大桥东主塔施工实际,在自然条件恶劣、下横梁荷载巨大的情况下,采用施工围堰与竖向支承结构有机结合的组合结构,优化结构传力路径,简化施工流程,保证大型下横梁顺利施工。其中水平受力结构采用锁口钢管桩围堰,并与已施工完成的防撞钢吊箱采用可靠连接,围堰底部利用袋装黏土及旋喷桩加固处理止水,上覆黏土层、碎石垫层,保证围堰止水性良好和结构稳定性良好;竖向支承结构采用钻孔灌注桩基础、钢结构梁系,确保横梁荷载能够通过基础有效传递至地层中。优化组合结构的成功实践,可为海上大型混凝土结构及类似结构施工提供借鉴。Depending on the east pylon construction practice of the Lingdingyang Bridge in Shenzhen-Zhongshan Link,under the bad natural conditions and the heavy load of the lower cross beam,the combined structure of construction cofferdam and vertical supporting structure was adopted to optimize the load transfer path of structure,simplify the construction process,and ensure the smooth construction of large-scale lower beam.The horizontal stress structure adopted cofferdam of steel pipe pile with locking collar,and was reliably connected with the crashworthy steel cofferdam which has been completed.At the bottom of the cofferdam,the water seal was strengthened by using bagged clay and rotary jet grouting pile,and the clay layer and crushed stone cushion were overlaid to ensure good water sealing and structural stability of the cofferdam.the vertical supporting structure adopted bored pile foundation and steel beam system to ensure the load of cross beam can transfer to stratum effectively through the foundation.The successful practice of the optimized composite structure can provide reference for the construction of large-scale concrete structures and similar structures in the sea.

关 键 词：深中通道 伶仃洋大桥 主塔 下横梁 围堰 支架 组合结构 防撞钢吊箱 

分 类 号：U655.4[交通运输工程—港口、海岸及近海工程]