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Washington, DC 20590
202-366-4000


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Partnering for Innovation
US 421/I-40 Business in Winston-Salem

Appendix C: Structures

IDEA (Short Name) IDEA (Detailed Description) Implementation Details (Barriers, Skill Set Coordination, etc.)
Reduction of bridge construction
  • Remove bridges at Fourth, Green and Spruce.
  • Combine Main and Church.
  • Shorten the bridge, lower the grade and provide arch-type single span structures at Liberty.
  • Consider strolling path and parking lot access at Liberty as well.
  • Shorten the bridge, lower the grade and provide arch-type single span structures at Brookstown.
  • Retain existing abutment walls, as feasible, for permanent or temporary use.
 
Vertical clearance
  • Consider non-standard bridge types.
  • Lower the grade on the I-40 Business roadway.
  • Look at abutment walls.
  • Consider single span bridges, eliminating median piers where possible.
  • This is feasible everywhere except Peters Creek.
  • Consider a concrete channel bridge, a shallow structure that can be precast and launched or cast-in-place depending on accessibility below.
  • The edge beam section doubles as the bridge barrier rail, giving it a nice, slender appearance.
  • Construct a tied-steel-arch bridge utilizing cable stayed technology, either at a central location or on one end of the project as a signature-type bridge.
Aesthetics
  • Minimize visual impacts.
  • Select functional/unique bridge location for signature bridge(s).
  • Construct slender superstructures.
  • Consider form liners for walls.
  • Utilize decorative rails.
  • Provide architectural lighting.
  • Avoid noise walls.
Staging of work
  • Look at project termini - Peters Creek and Main/Church Street areas - as well as the central portion of the project.
  • Complete conventional-type bridges and interchanges as separate project prior to beginning the main I-40 closure project.
  • Construct the central portion of the project (incorporating frontage roads) first; this will provide better access to downtown during construction of I-40 Business.
Foundations
  • Minimize pile driving due to noise and vibrations.
  • Complete the eastbound foundation work in advance to accelerate bridge construction.
  • May require paving over at frontage roads and uncovering at a later stage.
  • Use alternate foundations such as spread footings, drilled piers, micro piles, slurry walls, etc.
Utility attachments
  • Avoid utility attachments on all non-standard bridges.
 
Other
  • Consider the frontage road concept and the "cut and tunnel" (false tunnel) concept.
  • Provides for zoned construction, the ability to work around existing ramps and coordinated closures while promoting traffic flow.
  • Provides distinct locations for landscaping and/or monuments and also improves the final access to downtown.
  • If historic properties or other issues conflict with the frontage roads in the Spruce, Marshall and Cherry blocks, then consider the false tunnel concept to allow the frontage road alignment described above to overlap I-40 Business.
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Updated: 11/06/2013
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000