The 11km Shanghai-Nantong Yangtze River Bridge will have two levels - a six-lane highway on the upper level and a four-line railway on the lower. When opened next year, the bridge will cut the journey time between Shanghai and Nantong from two hours to one.The south bridge is a cable-stayed structure with steel framework, spanning the main channel of the Yangtze River. The north bridge crosses the Tiansheng Port channel and has a rigid steel girder structure and a flexible arch with a main span of 336m. It will also be the longest steel railway bridge in the world.The pylons are being constructed in one of the biggest and deepest (115m) coffer dams ever built. Around 147,000m~3 of concrete is needed for one pylon.Difficult weather conditions - wind over 70kph - climbing in 55 pouring steps without major alterations to the working platforms and progressive reuse of the formwork sheets posed major challenges for Doka. "Height of more than 300m and poor, foggy weather conditions are the biggest challenges for this jobsite," said Yuan Bo, principal engineer with China Railway Bridge Bureau.
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