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Expressway in the clouds: some facts

China

Client: Guizhou Expressway Development Corporation l Construction manager:

Guizhou Provincial Communications Department l International onsultant:

Halcrow l 17 contract packages

Length: 18km Cost: 480M l Highest altitude: 1450m l Lowest altitude: 420m l Earthworks: 7Mm 3l 121 bridges, total length 25,606m l 17 tunnels, total length 19,248m l Bridges/tunnels: 38% of total length, 60% of total cost l Contract 2 has bridges and tunnels accounting for 86% of its 3.9km length l Longest tunnel: Liangfengya, at 4,107m one of the longest highway tunnels in China l For Laingfengya, no single supporting method could be used continuously for more than 80m because of varied geological conditions l Precipitous access means access roads can be three times the length of each contract section; eg Contract 7 access road is 20km long l Highest pier: 100m l Difficult ground conditions include underground lakes, methane percolation from coal measures and shear zones l There are two turning bridges - Anshan bridge weighs 8,848t (one of the heaviest in China);

l Chumi I bridge consists of two parallel bridges turning at the same time, each weighing 3,835t.

l During peak construction (2003/4) 55 tunnel drives were excavated at the same time.

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