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2nd Midtown Tunnel

United States of America

A new two-lane transportation tunnel under the Elizabeth River and parallel to the existing Midtown tunnel. This is the first SL-1 Tunnel project in the USA

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Project data

Year of completion
2015
Project duration
36 Months
Country
United States of America
Address
Norfolk and Portsmouth VA.
Town or city
Portsmouth
Contractors
Skanska-Kiewit-Weeks - Joint Venture
Structure
Tunnel
Type of structure
Cut-and-cover tunnel
Architect
Parsons Brinckerhoff

Floor-slab

Construction method
Arched
Cross-sectional shape
Multi-cell box girder – straight webs
Structure height
28,50 m
Number of spans
11
Longest span
54,00 m
Clear width
36,00 m
Clear height
21,50 m
Formed length of tunnel
3770 m
Shape
Radius
Type of carriage/traveller or formwork
Large formwork traveller
Number of casting sections
55
Cycle time
4 -day cycle
Form-tie pattern
Stipulated by architect
Type of edge
Rounded/chamfered edge