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Construction completed on world’s longest immersed tube tunnel

Construction on the Hong Kong–Zhuhai–Macau Bridge (HZMB) has been completed, securing the scheme the world record for the longest immersed tube tunnel at 6.7km.

The bridge and tunnelled connection has a total length of 55km formed by 23km of long-span composite construction viaducts, three cable stay bridges up to 460m long and two large artificial islands reclaimed from the estuary.

HZMB is expected to reduce travelling times between Hong Kong and Zhuhai or Macau from over four hours to under one hour. The bridge and tunnel link will also enhance economic and sustainable development around the Pearl River estuary, one of the world’s biggest shipping channels.

Mott MacDonald worked as lead designer, including geotechnics, for one viaducts at the Hong Kong end of the bridge, as well as quality assurance for the Chinese sections. Mott MacDonald project principal Zhang Chun said: “The project faced many challenges, not only due to its size but also because of its unique location between three jurisdictions and the difficult offshore environment. It has been a major achievement for the Hong Kong-Zhuhai-Macau Bridge Authority to have led the project from the initial concept stage, through detailed design, to construction and successful completion.”

HZMB is expected to open to public traffic by the middle of 2018.

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