Construction Techniques for Full-Span Precasting and Erection of Offshore Large Size Prestressed Concrete Box Girders

The offshore approach spans of Hangzhou Bay Sea-Crossing Bridge are all designed to use the 70-m span prestressed concrete box girders that are first simply supported and then made continuous during erection.In this paper,the construction techniques for precasting,shifting and delivery on land,and transportation at sea of the 70-m span concrete box girders in each full span and the new materials,workmanship and equipment having been applied to the construction of the girders are dealt with.