Second Downtown Tunnel
HEIGHT: 10.5 m
WIDTH: 12.2 m
TOTAL IMMERSED LENGTH: 765 m
DEPTH AT BOTTOM OF STRUCTURE: 13.7 m
ENVIRONMENTAL CONDITIONS: Current 1.0 m/s (2 knots) max. Tide 1.2 m
FABRICATION METHOD: In shipyard in Corpus Christi, Texas, 3,500 km from tunnel site.
WIDTH: 12.2 m
TOTAL IMMERSED LENGTH: 765 m
DEPTH AT BOTTOM OF STRUCTURE: 13.7 m
ENVIRONMENTAL CONDITIONS: Current 1.0 m/s (2 knots) max. Tide 1.2 m
FABRICATION METHOD: In shipyard in Corpus Christi, Texas, 3,500 km from tunnel site.
Norfolk to Portsmouth, Virginia,
United States
Virginia Department of Highways and Transportation.
J A Jones Construction Co and Schiavone Construction Co
Parsons Brinckerhoff Quade & Douglas Inc
85.3 m to 101.2 m
765m
13.7m
Project construction
1988-04-30
8
One tube; two lanes
10.5m
12.2m
Horseshoe shape was used for economy because of the ventilation adopted. Elements
were fabricated in Texas and shipped in pairs on a semi-submersible ocean-going
barge.
were fabricated in Texas and shipped in pairs on a semi-submersible ocean-going
barge.
In shipyard in Corpus Christi, Texas, 3,500 km from
tunnel site.
tunnel site.
At dockside near site.
Current 1.0 m/s (2 knots) max. Tide 1.2 m
From catamaran barge system. Tube was brought out almost fully ballasted to reduce
the time in the river channel.
Remotely controlled wedges used for horizontal alignment.
the time in the river channel.
Remotely controlled wedges used for horizontal alignment.
Double gasket system.
Continuous steel shell.
Screeded gravel bedding.
1.5 m of ordinary backfill.