Cooling Water Outfall

Kilroot, United Kingdom
HEIGHT: 3.53 m
WIDTH: 6.91 m
DEPTH AT BOTTOM OF STRUCTURE: 8-7 m
TOTAL IMMERSED LENGTH: 584 m
ENVIRONMENTAL CONDITIONS:
Exposed tunnel site facing the Irish Sea
FABRICATION METHOD:
Tunnel elements were cast in one batch in temporarily
closed water intake basin
s28
s28-kilroot
Northern Ireland Electricity Service
Christiani & Nielsen Ltd
4 - 94.0 m 1 - 85.8 m
584m
8-7m
1978-05-01
5
Two tubes
3.53m
6.91m
Immersed tunnel placed in the Irish Sea, subject to wave Ioadings. Lay-out and design
of temporary supports and warping/sinking equipment was based on results of hydraulic
model tests.
Tunnel elements were cast in one batch in temporarily
closed water intake basin
Done in flooded casting
basin at low water
Exposed tunnel site facing the Irish Sea
Two catamaran rigs with 200 tonne lifting capacity each lifted tunnel element out of
the casting basin. The elements were not in a buoyant state. The rigs were equipped
with hydraulic winches and were used for lowering the elements to their final position
Trelleborg rubber gasket in
element joints
No waterproofing membrane
Jetted sand foundation installed using patented Christiani & Nielsen method. Temporaw
support on U-shaped sills
1 m of armour stone