Al Dabba Bridge has an overall length of 366.6 m and carries a dual two lane highway over the Nile in northern Sudan. The bridge is located approximately 300km north of Khartoum on the edge of the Nubian Desert where temperatures frequently rises to 45°C and connects into the new Shirian El Shamal Highway.
Tony Gee was responsible for developing the full tender and detailed design including technical assistance during the construction phase. The bridges were designed for seismic loading to ensure the sliding bearings have adequate seating lengths and the provision of upstand plinths to take horizontal loads.
The substructure, which was designed to be constructed in the dry during the low water season, is supported in large diameter bored piles founded in the underlying weathered sandstone. Piling operations were particularly challenging due to the depth of water varying seasonally between 7.85 m and 19 m.