Tuas Bay Cable Tunnel
HEIGHT: 4.425m
WIDTH: 11.79m
TOTAL IMMERSED LENGTH: 2.1km
FABRICATION METHOD:
4m segments constructed on quay, rotated, and lifted into
position for prestessing to form monolithic elements.
Assmbled and stressed on purpose built ship lift which
subsequently lowered elements into water
WIDTH: 11.79m
TOTAL IMMERSED LENGTH: 2.1km
FABRICATION METHOD:
4m segments constructed on quay, rotated, and lifted into
position for prestessing to form monolithic elements.
Assmbled and stressed on purpose built ship lift which
subsequently lowered elements into water
Singapore,
Singapore
PUB
Obayashi
Parsons Brinkerhoff
100m
2.1km
Project construction
1998-07-11
17No. straight, 4 curved
Twin tube with cable troughs running below vehicle running surface in each tube
4.425m
11.79m
The tunnel has one 90 degree bend and one 45 degree bend, achieved by using tapered
segments to form curved elements.
The tunnel carries 400kV and 230kV power cables and has a water pipe cooling system to
remove heat.
segments to form curved elements.
The tunnel carries 400kV and 230kV power cables and has a water pipe cooling system to
remove heat.
4m segments constructed on quay, rotated, and lifted into
position for prestessing to form monolithic elements.
Assmbled and stressed on purpose built ship lift which
subsequently lowered elements into water
position for prestessing to form monolithic elements.
Assmbled and stressed on purpose built ship lift which
subsequently lowered elements into water
Initially on ship lift, then final
outfitting when held by
sheerlegs
outfitting when held by
sheerlegs
Elements were negatively buoyant and supported by floatation tanks for transportation. 2no
400T sheerleg cranes used for lowering.
400T sheerleg cranes used for lowering.
Gina & omega gaskets
Watertight concrete achieved by single pour segments to avoid joints and risk of cracking.
Glued joints between segments.
Glued joints between segments.
Pumped sand foundation through pipe in central dividing wall. Single line of injection points due
to narrow width.
to narrow width.
1.25m deep rock above tunnel, 2m
deep rock protection to sides.
deep rock protection to sides.
1.05