The Study Of Super-size Caisson Anchorage Design Method For Marine Ground-Anchored Suspension Bridge

With more closely around the economic and politic communication across regions, convenient transportation plays a more important role on the development of the city. The cross-sea bridge solves the transportation problem between the coastal city (or city at estuary) and the offshore islands,as well as the connection problem of the twin city divided by gulf or channel, while has landscape effect. There are several completed cross-sea bridges which become the landmark landscape architecture, eg. Hangzhou bay bridge, Qingdao bay bridge. The ground-anchored suspension bridge has the advantage on adaptation of large span and exquisite outward appearance, which is more suitable for thelandscape requirements of the project.Anchorage foundation design and selection for ground-anchored suspension bridge is the most important for the whole project, cause of harsh and complex extreme ocean condition,including wave force, current force, geological condition and erosion and deposition of sediment. The anchorage have tunnel type and gravity type, gravity anchorage can be used in the marine engineering generally. Deep underwater foundation (eg. expand the foundation, pile foundation, the open caisson foundation, string foundation, composite foundation) can be used widely in the transmission of load, the marine workload of those structures is so huge that requires a relatively complex technology support and a much long construction process.The anchorage foundation design introduce the concepts of caisson structure, and adopting the super-size caisson structure to replace the traditional anchorage structure, such measure reduce the marine workload and the construction period.. The finite element analysis model and structure design method have been established for super-size caisson structure. The author propose the structure design method aiming at the actual project-Xinghai Bay main bridge. Finally, the model test has been carry out, and practicability of the method is proved by experimental data. This research conclusion provide important reference significance for offshore artificial building large-scale infrastructure design.