Assembly of Continuous Beams by Cantilevering for Shenzhen Bay Bridge at Sea

The continuous box girders for the non-navigational spans of the Shenzhen Bay Bridge linking Shenzhen to Hong Kong were assembled by cantilevering at sea.All the sections of Span 0 and the Enclosure Span were prefabricated at the precasting yard.The radius of the vertical curve was 14 116 m and the radius of the horizontal curve was 4 000 m.All the ducts for longitudinal prestressing tendons were grouted with the vacuum pressure grouting technique.The paper describes the procedures for the prefabrication and transportation of sections of the beams,erection of supports near bridge piers,erection of supports for side spans,hoisting and assembly of Span 0 and positioning.With the implementation of the various technological processes,the difficult offshore bridge was smoothly completed in the specified time and with high quality.