武汉鹦鹉洲长江大桥是目前世界上跨度最大的三塔四跨悬索桥,其北锚碇设计采用超大圆形重力式沉井基础。该沉井位于中心城区内,周边紧邻密集民房建筑、高层住宅楼和长江防洪大堤等重要构造物,施工环境非常复杂,施工安全风险防控要求很高。施工通过设置地下连续墙防护结构,因地制宜、总结和运用沉井下沉的一些关键技术和控制手段,成功实现了沉井安全、平稳、快速、精确下沉到位。 Wuhan Parrot Island Yangtze River Bridge is the world’s largest span of the four-tower four-span suspension bridge, the North Anchorage design using super-circular gravity caisson foundation. The caisson is located in the center of the city, surrounded by densely populated houses, high-rise residential buildings and the Yangtze River flood dam and other important structures, the construction environment is very complex, construction safety risk prevention and control requirements are high. Through setting up the underground continuous wall protective structure and summing up and using some key technologies and control methods of caisson sinking, the caisson is successfully realized safely, smoothly, rapidly and precisely and sinking into place.