1. Local knowledge n International experience n Focused on success
Eagle’s Nest Tunnel
LOCATION
Hong Kong
CLIENT
Highways Department
CONTRACT TYPE
Remeasurement
CONTRACT VALUE
HK$1.83 billion
COMMENCED
October 2003
COMPLETED
February 2008
Leighton was the leader of a joint venture responsible for the construction
of this major section of Route 8 linking Sha Tin in the New Territories with
Kowloon West.
The major element of the project was the twin 2.1 kilometre long, three-lane
Eagle’s Nest Tunnel. This included a 400 metre long adit joined to the main
tunnels as part of the ventilation system. All tunnels were excavated by the drill
and blast method, using six jumbo drilling machines.
Apart from the tunnels, the project also included:
n two portal buildings, one at each end of the main tunnel, plus a ventilation
building at the entrance to the adit
n an administration building and maintenance workshop
n site formation works and slope works, including 400,000 cubic metres of cut
and fill work and a major culvert and channel to divert the outflow of the
Kowloon Byewash Reservoir
n roadworks, including a toll plaza with a subway and footbridge
n architectural finishes to the two portal buildings on the adjacent Sha Tin
Heights tunnel
n all electrical and mechanical services for the Eagle’s Nest Tunnel, the Sha Tin
Heights Tunnel and its portal buildings, the Tai Wai Tunnel and the noise
enclosures in the adjacent Lai Chi Kok Viaduct contract
n extensive landscaping
Tunnel blasting was required to meet strict vibration limits within a 60 metre
protection zone around various Water Supplies Department facilities, including
a water treatment plant and a section of a water supply tunnel running just 20
to 30 metres beneath the tunnel.
In order to enable tunnelling and mucking operations to be carried out during
extended working hours, various noise control measures were implemented,
including the erection of extensive temporary noise barriers to shield nearby
residential properties and the implementation of time limits on the operation
of tunnelling equipment.
H2226
Hong Kong