Bankhead Tunnel
TOTAL IMMERSED LENGTH: 610 m
HEIGHT: 10.4
WIDTH: 10.4
DEPTH AT BOTTOM OF STRUCTURE: 25 m
FABRICATION METHOD: In shipyard 1 km away from site. The elements were sidelaunched into river, then placed in shipyard’s drydock for placement of keel concrete (for stability). The element was then towed to the outfitting yard near the site.
SITE CONDITIONS: river
HEIGHT: 10.4
WIDTH: 10.4
DEPTH AT BOTTOM OF STRUCTURE: 25 m
FABRICATION METHOD: In shipyard 1 km away from site. The elements were sidelaunched into river, then placed in shipyard’s drydock for placement of keel concrete (for stability). The element was then towed to the outfitting yard near the site.
SITE CONDITIONS: river
Mobile, Alabama, U.S.A.,
United States
City of Mobile revenue bond issue
Arundel Corporation of Baltimore and the Alabama Drydock and Shipbuilding Company.
Messrs Wilberding and Palmer Inc (of Washington D.C)
5-90.8m 2-78.0m
610m
25m
Project construction
1940-03-31
7
One tube; two lanes; one each way
10.4m
10.4m
Placed from pile-supported frames. Foundation material was placed with element held
in position from frames. Elements were placed a few inches high to accommodate
settlement.
in position from frames. Elements were placed a few inches high to accommodate
settlement.
In shipyard 1 km away from site. The elements were sidelaunched
into river, then placed in shipyard’s drydock for
placement of keel concrete (for stability). The element
was then towed to the outfitting yard near the site.
into river, then placed in shipyard’s drydock for
placement of keel concrete (for stability). The element
was then towed to the outfitting yard near the site.
Concrete was placed from
floating batch plant.
floating batch plant.
Gallows frames supported from H-pile clusters.
Tremie concrete.
Continuous steel shell.
Element was held at grade while sand was placed along the sides with tremie pipes.
A minimum of 3 m of backfill