Design and Construction Techniques of Delivery Wharf for 70-m Span Precast Concrete Box Gir-ders of Hangzhou Bay Sea-Crossing Bridge

A single piece of the 70-m full span precast concrete box girders of Contract VIII,Hangzhou Bay Sea-Crossing Bridge is approximately 2 200 t in weight.The delivery wharf built for the box girders is a one in the category of heavy-duty dynamic load wharfs in the coastal areas in China.In the design of the wharf,the adverse influences of harsh environmental conditions on the construction of the wharf,such as the waves,tide,typhoon and bad geology,were thoroughly considered and the design of the wharf was carried out in a way to greatly satisfy the construction requirements,which would not only significantly reduce the construction cost,but also bring about technical innovations in both the design and construction.In this paper,the comparison of the design schemes,key points of the structural design and calculation,and principal construction techniques of the wharf are mainly described.