Construction Techniques for Precasting of 32-m Span PC Box Girders of Wuhan-Guangzhou Passenger Dedicated Railway

The total length of Wuhan-Guangzhou Passenger Dedicated Railway is 1 068 km,of which the length of the bridges and tunnels on the railway accounts for 66.7%.For the bridges,the double-track full-span simply-supported prestressed concrete(PC) box girders arranged in 32 m equal spans are the major structural type.The girders were precast with high performance concrete in each full span in precast yards through the principal working procedures of the construction preparation,formwork construction,concrete construction,prestressing construction and the quality of precasting of the girders in such procedures was good.