Western Harbour Crossing

Hong Kong, Hong Kong
HEIGHT: 8.57 m
WIDTH: 33.4 m
TOTAL IMMERSED LENGTH: 1363.5 m
DEPTH AT BOTTOM OF STRUCTURE: 25.3 m
ENVIRONMENTAL CONDITIONS:
Sheltered passage, 1 m/s tidal current.
FABRICATION METHOD:
Graving basin in unused part of Shek-O Quarry, ocean
tow to mooring. Sheltered harbour tow to final location.
t98
t98-western-harbour-crossing
(Franchisee) Western Harbour Tunnel Co. Ltd., ultimate owner HK Government
Kumagai Gumi on behalf of the Nishimatsu-Kumagai Joint Venture
Joint venture of Acer Consultants and Parsons Brinckerhoff on behalf of the Maunsell Acer Parsons Brinckerhoff Joint Venture
113.5m
1365.5m
25.3m
1997-05-01
12
Two tubes; three lanes each tube
8.57m
33.4m
Element 1 is tapered for 19.25 m; the first segment of Element 12 is placed with
Element 11 so that the final joint lies inside Element 12; final joint dewatered and cast in
the dry; one element of MTRC tunnel included in Batch 3. PFA replaced 35% of
cement. Very low water/cement ratio. Cooling pipes used.
Graving basin in unused part of Shek-O Quarry, ocean
tow to mooring. Sheltered harbour tow to final location.
Sheltered passage, 1 m/s tidal current.
Lowered from two transverse barges initially resting on top surface of tunnel element.
Flexible Gina/Omega-type joints, steel
shear keys between elements.
Bottom plate is ribbed plastic, sides and top have tough spray-on membrane, without
protection to sides.
Initial support on previous section of tunnel, free end supported on two hydraulicallyoperated
temporary supports while sand-flow foundation was prepared utilizing pipes
installed in the walls from the roof slab to the base slab.
Concrete protection to roof waterproofing; general backfill covered with rock protection,
total 1.5 m thick; rock dikes for anchor release close to tunnel.