(IBC 07-03) Key Techniques during Design and Construction of Deep Water Foundation and Steel Pylon for the Nanjing Third Yangtze River Bridge

摘要

The Nanjing Third Yangtze River Bridge (short as Nanjing Third Bridge) is a key national project approved by the State of Council. It's a major cable-stayed bridge with a main span of 648m, consisting of steel pylon and steel box girder. It ranks No.l in China and No.3 in the world in all completed cable stayed bridges of the same type. It's also the first time in the world to use curve shaped pylon legs. The project investigated and successfully solved some key techniques during design and construction of the first large span cable stayed bridge made of steel pylon and steel box girder in China. These key techniques can be summarized as follows: 1.1 Design and construction of deep water foundation Pylon foundation of Nanjing Third Bridge is located in deep water of Yangtze River. On the condition of deep water and high water flow velocity (normal water depth:40m, water flow velocity:2.9m/s), in order to control construction risk and ensure construction safety, the bridge successfully adopted a rigid construction platform system combined by self-buoyancy steel cofferdam and steel casing and developed innovative techniques during design and construction of deep water foundation, which effectively reduced construction period of time and saved the cost.