Mengdonghe Bridge Zhanghua

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Mengdonghe Bridge Zhanghua
张花高速猛洞河大桥
Yongshun, Hunan, China
761 feet high / 232 meters high
837 foot span / 255 meter span
2013

Mengdonghe Zhanghua.jpg


Another gorgeous gorge buster, the Mengdong River Bridge is one of 3 high river crossings on the new Zhang Hua Expressway that extends from Zhangjiajie city in the east to Chongqing Province in the west and to Jishou City in the south. The other 2 giant spans are the Lishui and Aizhai suspension bridges. The CFST or concrete filled steel tubular arch of Mengdong is a creation of Chinese engineers since they first used in 1990 and is now the common method to build steel arch bridges throughout China's western provinces, especially when crossing a deep gorge or ravine.

The eight large steel tubes that run along the underside of the Mengdong arch were initially hollow. Once the arch was closed, concrete was pumped into these tubes from the bottom up. Depending on the length of the span and the width of the bridge, different styles of tubing are used. For Mengdong, they adopted an array of single tubes spaced apart from each other. Other configurations include dumbbells with two tubes closely connected, a mix of a dumbbell and single tubes such as was done on the Beipanjiang River Railway bridge or a tight cluster of tubes known as “multiple contiguous”. Once hardened, the concrete solidifies and stiffens the arch, improving the compressive strength of the entire structure.

I was fortunate to visit the construction site along with 2 other bridge fans during a 2011 trip through western China. Our amazing tour included a walk over an incredible 400 meter long Tibet-style construction footbridge. Our movement across the bridge created some unusual oscillations and other odd motions that made it one of the most unique bridge crossings I have ever taken. The feeling is similar to the experience of walking over a tourist bridge like Canada's Capilano Bridge but with much longer and more sustained up and down "wave" motions.

Since Mengdong spans a reservoir formed by a dam just downstream from the crossing, the bridge is 217 meters from deck to full pool or 232 meters from deck to the old river surface which is the official height figure HighestBridges.com always uses. The temporary Tibet-style footbridge was 174 meters above the reservoir or 189 meters above the old river level making it one of the highest defunct footbridges ever built.


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Mengdong Zhanghua Bridge Elevation


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Mengdonghe Yongji Bridge and Mengdonghe Zhanghua Bridge size comparison


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Image by Richard Scott.


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MengdongFinished.jpg

Image by Michael Wu.


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Image by Eric Sakowski / HighestBridges.com


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Image by Peter Wu.


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Image by Eric Sakowski / HighestBridges.com


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Image by John Filmer.


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Image by Eric Sakowski / HighestBridges.com


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The downstream dam below the Mengdong crossing. Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Note the simple wood plank platforms overhanging the side of the arch ribs. Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


MengdongArchCatwalkView.jpg

Image by Eric Sakowski / HighestBridges.com


MengdongArchTrussView.jpg

Image by Eric Sakowski / HighestBridges.com


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Foundation construction.


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MengdongCompleteSpandrels.jpg

Image by Michael Wu.


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Image by Michael Wu.


MengdongConstructionTruss.jpg

Image by Michael Wu.


MengdongCFSTconstruction.jpg

Image by Michael Wu.


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Image by jt.rednet.cn


Image by Hunan.voc.com.cn


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The amazing temporary footbridge set up for the construction of the new Mengdong arch bridge. This span was 570 feet above the reservoir and was more then 300 meters long.


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Image by Michael Wu.


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Image by Michael Wu.


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Image by Michael Wu.


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Image by Michael Wu.


Image by Hunan.voc.com.cn


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MengdongBridgeCatwalk3.jpg


MengdongCatwalk2.jpg
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