Nanjing Dashengguan Yangtze River Bridge, China
Nanjing Dashengguan Yangtze River Bridge is a project of the Beijing‐Shanghai High‐speed Railway Line. With a total length of 1615m, the main bridge is a large-span, double-arch and composite truss-arch structure. This bridge has innovatively adopted double arch structure with three main trusses. It accommodates six railway tracks including two tracks of Beijing‐Shanghai High‐speed Railway, two tracks of Shanghai‐Wuhan‐Chengdu High‐speed Railway and double lines of Nanjing municipal Metro. The bridge carries the most railway lines in the world. It is the utmost heavy-load high-speed railway bridge. A series of innovative designs and techniques have adopted on this bridge to cross the river, genuinely benefitting mankind with integration of speed and safety, tradition and modernisation, technology and innovation.
The Composite slab-truss structure made of monolithic steel deck structure of steel orthotropic plate and three main trusses, improves the integrity and smoothness of the bridge structure. Box hangers with octagonal cross-section improve the performance of the wind-resistance of long hangers of the steel truss bridge. A new ultra–low carbon bainite Q420qE structural steel was developed and applied successfully in the bridge. It has high strength, high toughness, superior welding performance and ductility. An accurate positioning method of the double-wall floating cofferdam was used, adopting an integrally floating method and using heavy anchors, without a guiding barge.
The bridge sets a successful record for long-span bridges with multiple railway tracks, and has become a typical landmark in high-speed railway construction in China.