Central-Wan Chai Bypass
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The Central-Wan Chai Bypass is a proposed 4 km trunk road running between Central and Causeway Bay, Hong Kong. The original design consists of a 2.3 km dual 3-lane tunnel running under new reclamation areas which will be provided by Central and Wan Chai Reclamation project,[1] and also connections to Connaught Road West flyover and Island Eastern Corridor. When completed, it will substitute Connaught Road Central, Harcourt Road and Gloucester Road to be part of Route 4.[2]
Ventilation is an indispensable part for the operation of the tunnel as it will supply fresh air to maintain good air-quality environment to the commuters inside the tunnel while discharge vitiated air in a controlled manner at pre-determined suitable locations of exhaust. The tunnel ventilation system is also required to remove smoke in case of tunnel fire incidents. It is proposed to have three ventilation buildings sited near the western end, mid-length and eastern end of the Bypass to achieve the three objectives of supplying fresh air, extracting vitiated air and removing smoke during fire.
To achieve an energy efficient ventilation system by shortening the air extraction path, the location of proposed East Ventilation Building (EVB) needs to be as close to the tunnel portal as possible.[3]
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The bypass will start from Rumsey Street Flyover at Sheung Wan. It will enter a tunnel at Central, then heads east and has an interchange at Wan Chai. It continues to head east under the proposed reclamation areas of Wan Chai. In the original design, the bypass will leave the tunnel and have a connection with Island Eastern Corridor at Causeway Bay.[1] However, it is likely that an altered design, which will have the bypass leaving the tunnel at somewhere near Oil Street, North Point, will be considered.[4]
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