River Lee Tunnel

t104-jack-lynch
Cork, Ireland
HEIGHT: 8.4 m
WIDTH: 23.8 m
TOTAL IMMERSED LENGTH: 610 m of tunnel
120 m boat element
DEPTH AT BOTTOM OF STRUCTURE: 20 m
ENVIRONMENTAL CONDITIONS:
Sensitive scenic area downstream of Port of Cork. Internationally important site for
some species of wading birds.
FABRICATION METHOD: Cast in segments and
temporarily prestressed
Cork Corporation
J.V. of Tarmac Construction and (Irish) P J Walls
Owner’s engineer was Ewbank Preece O hEocha in association with Symonds Travers Morgan. Contract is design and build. Contractor’s designer is Mott MacDonald.
122m
610 m of tunnel 120 m boat element
20m
5 and one boat element
Two tubes with two lanes each
8.4m
23.8m
Cast in south open approach structure. One approach ramp (north end) constructed in
casting basin and floated into position
Cast in segments and
temporarily prestressed
Sensitive scenic area downstream of Port of Cork. Internationally important site for
some species of wading birds.
Elements winched to position from casting basin ballasted and lowered onto temporary
footings.
Gina and Omega
No separate membrane. Cooling of concrete adopted to control early age stresses and
ensure watertightness.
Sandflow
m thick layer of rock protection