Detroit Windsor Tunnel

between Detroit, Michigan, U.S.A. and Windsor, Canada, United States
TOTAL IMMERSED LENGTH: 669 m
DEPTH AT BOTTOM OF STRUCTURE: 18.5 m
HEIGHT: 10.6 m
WIDTH: 10.6 m
FABRICATION METHOD:
Welded steel construction. Steel fabricator; controlled side launching into river 6 miles from site.
SITE CONDITIONS: river
t6
t1-detroit-river
Detroit & Canada Tunnel Corporation.
Porter Brothers and Robert Porter of Spokane, Washington.
Parsons Klapp Brinckerhoff & Douglas
74.3m
669m
18.5m
1930-04-01
9
One tube; two lanes; one each way
10.6m
10.6m
The tunnel project was a combination of open approach structures, cut-and-cover structures, shield-driven tunnelling, and immersed tunnel construction.
Welded steel construction. Steel fabricator; controlled side launching into river 6 miles from site.
At dock near tunnel site. Exterior formwork was erected at outfitting pier.
Ballasting was done to bring the element to near neutral buoyancy. Concrete blocks were placed at one end to sink it some five feet. A barge was placed transversely to the end and lowering cables were attached. After this was also done at the opposite end, the element could be raised or lowered using these barges.
Tremie concrete.
Continuous steel shell.
Screeded bedding.
No cover