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
Project data
- Year of completion
- 2015
- Project duration
- 36 Months
- Country
- United States of America
- Address
- Norfolk and Portsmouth VA.
- Town or city
- Portsmouth
- Realization
- 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