杭州湾跨海大桥引桥方案构思与设计

杭州湾跨海大桥建设条件复杂,工程规模浩大,引桥占全桥总长95%左右,海上和滩涂区引桥上部结构分别采用跨度70 m和50 m预制箱梁,整孔预制架设。引桥下部结构大部分采用钢管桩基础和预制桥墩。介绍桥址自然环境、跨海长桥设计原则及引桥方案构思和比选。

Conceptual Considerations and Design of Approach Spans of Hangzhou Bay Sea-Crossing Bridge

The construction conditions of Hangzhou Bay Sea-Crossing Bridge are complicated and the construction scale of the Bridge is also great.In the overall length of the Bridge,the length of the approach spans alone accounts for approximately 95%.The superstructures of the approach spans offshore and in the tidal flat areas are designed to respectively use the 70-m and 50-m span concrete box girders that are to be precast and erected in each full span,and most parts of the substructures of the approach spans are to be used with the steel pipe pile foundations together with precast pier shafts.In this paper,the natural environment at the Bridge site is presented,and the design principles of long sea-crossing bridge,the conceptual considerations,comparison and selection of the approach spans of the Bridge are described as well.