Post on 30-Dec-2016
Foothills Parkway Bridge No. 2 Design Build Project
2010 PTI ConferenceGregory Hunsicker, P.E.
Project Description Bridge Alignment
and Geometry Post-tensioning
Applications Durability Construction
Method
Foothills Parkway Bridge 2
Project Description Foothills Parkway
Bridge 2 Design/Build
Contract Bid November
2009 Bridge length
approximately 800’
2 lane bridge ARRA
Project Team
Owner National Park Service (NPS)
EFLHD
Contractor: Bell and Associates
Construction Corven Engineering
Palmer Engineering Hedstrom Design Dan Brown and Associates
VSL
Northeast of the City of Townsend (Blount County, TN)
Great Smoky Mountain National Park
Project Location
Project Location
Project Description Scenic route
paralleling the Great Smoky Mountain National Park
Over 9 Million Visitors per Year
Context Sensitive Solutions
Context Sensitive Solutions
Longstanding Vision and Legacy National Parks opened
to automobiles in 1907 Yellowstone opened to
automobiles in 1915 NPS Established in 1916
Office of Public Roads (1916) 160 miles of Park Roads
NPS (Current) >8500 miles of Roads >1700 bridges
Yosemite National Park, 1903National Park Service Historic Photograph Collection
Context Sensitive Solutions
Longstanding Vision and Legacy National Parks opened
to automobiles in 1907 Yellowstone opened to
automobiles in 1915 NPS Established in 1916
Office of Public Roads (1916) 160 miles of Park Roads
NPS (Current) >8500 miles of Roads >1700 bridges
Yellowstone National Park, ~1920NPS Postcard, Frank J. Haynes
National Parks Roads History “Missing Link” Authorized
construction in 1944, started construction in 1965
National Park Service Centennial (1916 – 2016) Completion of Foothills Parkway
• Precast Segmental Bridge
• Balanced Cantilever Construction
• Access from East Abutment only
• Built not on, but “above” the Mountainside utilizing elevated work trestle
Bridge Description
Bridge Layout
180’ 180’ 180’125’ 125’
790’
Superstructure37’-6”
9’
16’
Minimum Radius: 262’ Superelevation: - 5.8% to +7.8% Grade: up to 8.0%
Substructure
Foundations:- Elevated Footings- 5’ x 20’ diameter- Sub-Footing Concrete- Micropiles
Piers:- 6’-6” x 10’ Oval- Flares to 16’ Cap- Hollow Section – 1’ Walls- Vertical Post-Tensioning
SubstructureBridge Aesthetics Consistent Theme through
other Bridges Granite Stone and Natural
Rock Outcroppings to Match other Bridges and Landscape
Pigmented Concrete Steel Forms Short Segments
Post-tensioning Layout
Post-tensioning Layout
Typical Pier Foundations
Micropiles
Post-tensioning Foundations
Durability Post-tensioned
Concrete Box Girder Precast Concrete PCI B4 Deflected Strand
Certification High Performance
Concrete Overlay Workmanship Specification
Requirements Personnel Qualifications Experience Quality Plans
Post-tensioning Specifications Florida DOT
Specification Section 461
FHWA Post-tensioning Tendon Grouting and Installation Manual
Post-Tensioning Manual, PTI
Post-tensioning Durability Robust PT Systems Internal Tendons Plastic Duct and Caps
Transversely Post-tensioned Top Slab
Future Tendon Provisions
Post-tensioning Durability PTI Bonded Post-
tensioning Installer Certification
ASBI Grouting Certification
Prepackaged Grout Post-grout inspection
Quality Geometry Control by
Designer Post-tensioned
Grouting by post-tensioning supplier ASBI Grout Technician
Integrated Team
Construction Method Minimize Impact to the
Environment Quality of Construction Aesthetics Schedule – Rate of
Construction Provisions for Maintaining
Schedule Safety Cost
Construction Method Challenges Access only from Abutment 1 Rock Outcropping at Pier 3 Maintain Alignment and Geometry Challenging Geometry Steep Slopes “Do Not Disturb” areas
Foothills Parkway Bridge 2 RenderingEFLHD, Richard McDaniel
Construction Method
Construction Method Challenges Access only from Abutment 1 Rock Outcropping at Pier 3 Maintain Alignment and Geometry Challenging Geometry Steep Slopes “Do Not Disturb” areas
Options Considered Precast Segmental Erected in
Balanced Cantilever
Construction Method Advance Micropile Rig
2300
2320
2340
2360
2380
2280
2260
Construction Method Construct Trestle / Install Micropiles
for Trestle
2300
2320
2340
2360
2380
2280
2260
Construction Method Advance Crane
2300
2320
2340
2360
2380
2280
2260
Construction Method Construct Next Trestle Span
2300
2320
2340
2360
2380
2280
2260
Construction Method Construct Footings and Set Precast
Pier Segments
2300
2320
2340
2360
2380
2280
2260
Construction Method Mobilize Segment Loader
2300
2320
2340
2360
2380
2280
2260
Construction Method Erect Precast Segments with
Segment Loader
2300
2320
2340
2360
2380
2280
2260
Erect Superstructure in Balanced Cantilever
Completed Structure
Project Schedule
Notice to Proceed January 2010
Current Progress
Scheduled Completion Fall 2011
Foothills Parkway Bridge 2 RenderingEFLHD, Richard McDaniel
Foothills Parkway Bridge No. 2 Design Build Project