China to have worlds longest immersed tunnel
COWI has signed a contract to provide the preliminary design for a combined bridge and tunnel link in China. The immersed tunnel will be based on the same tunnel concept which was chosen for the Øresund fixed link between Denmark and Sweden and the Busan-Geoje link in Korea.
A contract has been signed between the Chinese government and a joint venture including COWI concerning a nine month preliminary design project for the Hong Kong-Zhuhai-Macao link.
COWI’s responsibility is for the immersed tunnel section of the combined bridge and tunnel link between Hong Kong, Zhuhai in China and Macao.
The project will be carried out in a joint venture with the Chinese Highway Plan and Design Institute (HPDI), Shanghai Tunnel and Design Institute (STEDI), the First Harbour Design Institute, and ARUP, based in Hong Kong.
The road link, which is expected to be completed in six years, will be about 30km in length and will pass two man made islands. The immersed tunnel alone will be 5.6km long, making it the longest of its kind in the world, two km longer than the current record holding immersed tunnel section of the Danish-Swedish Øresund fixed link.
The tunnel will also be big in terms of width and depth. Whereas most road tunnels have two lanes in each direction and an internal width of approximately 10m, the Hong Kong-Zhuhai-Macao link road tunnel will have three lanes in each direction and have an internal width of 14m.
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