Tony Gee was commissioned to prepare a design of the superstructure of the decks of the proposed Jamal Abdul Nasser Street Viaduct and the Hospital Road and Ghazali Street Interchange Structures in Kuwait. The project comprises the construction of approximately 350,000 m2 of elevated roadway, making this one of the largest precast segmental bridge projects in the world.
The 15.3m wide dual carriageway viaducts are divided into a series of continuous bridge modules of seven to nine spans of typically 45m, and separated by movement joints. The bridge deck consists of typically twin single cell box girders supported by transverse pier diaphragms, a single central pier, pilecap and multiple piles at each support location.
The twin deck box girders were erected using the span-by-span method. In this method all the segments in each span were suspended from the erection girder and then stressed onto the previously erected span so as to create a continuous bridge structure.
The spans were prestressed using a mixture of internal and external prestressing tendons for efficiency in design and speed and economy in construction. The prestressing layout is designed to maximise the space inside the box, so that there is a clear path along the centreline of the deck boxes for access and ease of future maintenance.