Lai Chi Kok Drainage Tunnel - Main Tunnel Breakthrough
The contract to design and construct the Lai Chi Kok Transfer Scheme was won by Leighton Asia and the construction work began in November, 2008. The breakthrough of this branch tunnel was done January this year and the whole project is expected to be finished late next year. The project consists of a Drainage tunnel to capture the Rainwater runoff from the Upper catchment in West Kowloon and discharge it into Victoria Harbor to alleviate flooding in the Lai Chi Kok, Cheung Sha Wan and Sham Shui Po areas.
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Lai Chi Kok Drainage Tunnel
The HK$1.7 billion project involves the construction of the branch tunnel and the main tunnel, each with internal diameter 4.9m, which totally adds up to 3.7km length. The main tunnel will collect all the storm water from butterfly valley and the branch tunnels and will be conveyed into the Victoria Harbor near Stonecutters Island. The 270 metres of three metre internal diameter connection adits and six intake shafts channel the storm water into the branch tunnels.
“Upon completion of the project, the flood protection level in Lai Chi Kok, Cheung Sha Wan and Sham Shui Po will be able to withstand rainstorms with a return period of one in 50 years. This will greatly alleviate the risk of flooding and associated impacts on the public, traffic and commercial activities,†Main tunnel breakthrough at Lai Chi Kok Drainage Tunnel (with photos) director of drainage services Chan Chi-chiu.
"We have overcome a number of challenges during the construction of the main tunnel including driving the tunnel boring machine (TBM) across four overlying operational railway lines and through the foundations of numerous existing infrastructures. Moreover, the work has involved 90 construction operations under hyperbaric pressure up to 4.2 bar, which is unprecedented in Hong Kong. We have taken this opportunity to bring to Hong Kong new hyperbaric technology for tunnel construction," he said.
#-Link-Snipped-#
Lai Chi Kok Drainage Tunnel
The HK$1.7 billion project involves the construction of the branch tunnel and the main tunnel, each with internal diameter 4.9m, which totally adds up to 3.7km length. The main tunnel will collect all the storm water from butterfly valley and the branch tunnels and will be conveyed into the Victoria Harbor near Stonecutters Island. The 270 metres of three metre internal diameter connection adits and six intake shafts channel the storm water into the branch tunnels.
“Upon completion of the project, the flood protection level in Lai Chi Kok, Cheung Sha Wan and Sham Shui Po will be able to withstand rainstorms with a return period of one in 50 years. This will greatly alleviate the risk of flooding and associated impacts on the public, traffic and commercial activities,†Main tunnel breakthrough at Lai Chi Kok Drainage Tunnel (with photos) director of drainage services Chan Chi-chiu.
"We have overcome a number of challenges during the construction of the main tunnel including driving the tunnel boring machine (TBM) across four overlying operational railway lines and through the foundations of numerous existing infrastructures. Moreover, the work has involved 90 construction operations under hyperbaric pressure up to 4.2 bar, which is unprecedented in Hong Kong. We have taken this opportunity to bring to Hong Kong new hyperbaric technology for tunnel construction," he said.
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