1. Contracts amount: HK$ 488 million
2. Scope of contracts: the project
comprises two design and build contracts in which four cable tunnels
are to be built:
||Kwai Chung Cable Tunnel
||Tsz Wan Shan Cable Tunnel
||Chi Ma Wan Cable Tunnel
||Tuen Mun Cable Tunnel
||From CLP Power Kwai Chung Substation
B to Wo Yi Hop Road
||From Tsz Wan Shan Substation at Shatin
Pass Road to Tsz Wan Shan Road
||From Tai Long Wan to Pui O Wan
||Crossing underneath Tuen Mun River
||Drill and blast. The tunnel will
be excavated in both directions simultaneously at selected launching
locations along the alignment
|| Pipe jacking using a mixed ground
||Excavated by hard rock TBM from Tai
Long Wan to Pui O Wan
||Pipe jacking using mixed ground TBM
||End of 2004
|Purpose of the
||Environmental friendly oil free cables
will be installed to replace ageing oil filled cables to improve
the reliability of the power network in Kwai Chung and Tsuen
||The tunnel is built to house 132kV
cable circuits to supply new developments in South East Kowloon
and replace ageing oil filled cables supplying San Po Kong and
Kwun Tong areas.
||The tunnel is built for accommodation
of 132kV cable circuits emanating from Pui O substation to supply
Cheung Chau. By installing new power cables through this tunnel,
some of the old 33kV overhead lines can be retired and thus
enhance the supply reliability to Cheung Chau.
||A new substation will be commissioned
in 2005 at San Shek Wan to reinforce the reliability of power
supply to over 120,000 customers in the Tuen Mun area. The tunnel
is required for connecting cables between the new substation
and the load centres at the other side of the Tuen Mun River.
For all these tunnels, works also include all associated modifications
in the substations, temporary works, shafts construction, M&E
installation in tunnels and ventilation structures.
3. Pipe jacking :
For the two pipe-jacked tunnels at Tsz Wan Shan
and Tuen Mun River, excavation will be done using a mixed ground
TBM. Hydraulic rams will be used to push up precast concrete pipe
sections (3.2 m diameter, longest section up to 2.5 m) to line the
cavity formed by the TBM from the drive shaft as the TBM moves forward.
These will be the largest tunnels (diameter) formed by pipe-jacking
using TBM in Hong Kong.
4. Site possession : From 1st November,
2002 to 1st January, 2003
5. Delivery :
All the cable tunnels are expected to be delivered within three
years, the earliest after 912 days for the Tuen Mun tunnel. The
overall project is expected to be completed within three years.
6. Project team :
- Design and build contractor : Dragages (HK) Joint Venture [Joint
venture between Dragages et
Travaux Publics (HK) Ltd and Bouygues Travaux Publics S.A.]
- The Engineer (Employer's representative) : Atkins China Limited
- Structural designer : Arup and Mott Connell
7. CLP Power Hong Kong Ltd.
CLP Power is the largest electric utility in Hong Kong serving the
business and domestic communities in Kowloon and the New Territorities,
including Lantau and most of the other outlying islands. Operating
a vertically integrated electricity generation, transmission and
distribution business, CLP Power provides a highly reliable supply
of electricity and excellent customer services to over two million
customers in its supply area.