A new east-west urban fast track linking Hanyang and Wuchang as part of the second ring of the city together with the Second Yangtze River Bridge in Wuhan.
The main span of the bridge is a triple-pylon suspension bridge with four spans – 200m+2x850m+200m. It is the longest steel-concrete composite girder suspension bridge in the world.
Use of the composite girder on one hand improves the structure’s gravity stiffness and alleviates sliding between the main cable and the saddle in the middle pylon, while on the other hand avoids the deck pavement problems caused by traditional steel decks.
The main pylon is of H-shaped frame structure. The middle pylon is an inverted Y-shaped steel-concrete coincided tower. The lower section is made of reinforced concrete while the upper part is of herringbone steel structure. The application of this structure achieves good balance between any deformation of the main pylon and anti-sliding of the cable saddle.
Gravity anchor blocks are used at both sides. The north anchor block employs open caisson foundation while the south one employs open-cutting expanded foundation supported by underground diaphragm wall. The pioneering use of open caisson foundation structure with round honeycomb section in this project made it possible to have smooth precise sinking of large scale open caisson in the downtown area.
The new green construction technology of deslagging with hydraulic pipes solved the technical and environmental protection problems encountered in building large-scale open caisson foundations in an urban area with high building density.
The breakthroughs in this triple-pylon four-span suspension bridge significantly strengthens the potential for development of super-long multiple-pylon suspension bridges in China in the future.
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China Railway Major Bridge Reconnaissance & Design Institute Co., Ltd
Wuhan Urban Construction Investment & Development Group Co., Ltd.