Foothills Parkway Bridge No. 2 Design Build Project

Transcription

1 Foothills Parkway Bridge No. 2 Design Build Project 2010 PTI Conference Gregory Hunsicker, P.E.

2 Foothills Parkway Bridge 2 Project Description Bridge Alignment and Geometry Post-tensioning Applications Durability Construction Method

3 Project Description Foothills Parkway Bridge 2 Design/Build Contract Bid November 2009 Bridge length approximately lane bridge ARRA

4 Project Team Owner National Park Service (NPS) EFLHD Contractor: Bell and Associates Construction Corven Engineering Palmer Engineering Hedstrom Design Dan Brown and Associates VSL

5 Project Location Northeast of the City of Townsend (Blount County, TN) Great Smoky Mountain National Park

6 Project Location

7 Scenic route paralleling the Great Smoky Mountain National Park Over 9 Million Visitors per Year Context Sensitive Solutions Project Description

8 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, 1903 National Park Service Historic Photograph Collection

9 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, ~1920 NPS Postcard, Frank J. Haynes

10 National Parks Roads History Missing Link Authorized construction in 1944, started construction in 1965 National Park Service Centennial ( ) Completion of Foothills Parkway

11 Bridge Description Precast Segmental Bridge Balanced Cantilever Construction Access from East Abutment only Built not on, but above the Mountainside utilizing elevated work trestle

12 Bridge Layout

13 Superstructure Minimum Radius: 262 Superelevation: - 5.8% to +7.8% Grade: up to 8.0%

14 Substructure Piers: x 10 Oval - Flares to 16 Cap - Hollow Section 1 Walls - Vertical Post-Tensioning Foundations: - Elevated Footings - 5 x 20 diameter - Sub-Footing Concrete - Micropiles

15 Substructure Bridge Aesthetics Consistent Theme through other Bridges Granite Stone and Natural Rock Outcroppings to Match other Bridges and Landscape Pigmented Concrete Steel Forms Short Segments

16 Post-tensioning Layout

17 Post-tensioning Layout

18 Typical Pier Foundations Post-tensioning Foundations Micropiles

19 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

20 Post-tensioning Specifications Florida DOT Specification Section 461 FHWA Post-tensioning Tendon Grouting and Installation Manual Post-Tensioning Manual, PTI

21 Post-tensioning Durability Robust PT Systems Internal Tendons Plastic Duct and Caps Transversely Posttensioned Top Slab Future Tendon Provisions

22 Post-tensioning Durability PTI Bonded Posttensioning Installer Certification ASBI Grouting Certification Prepackaged Grout Post-grout inspection

23 Geometry Control by Designer Post-tensioned Grouting by posttensioning supplier ASBI Grout Technician Integrated Team Quality

24 Construction Method Minimize Impact to the Environment Quality of Construction Aesthetics Schedule Rate of Construction Provisions for Maintaining Schedule Safety Cost

25 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 Rendering EFLHD, Richard McDaniel

26 Construction Method

27 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

28 Construction Method Advance Micropile Rig

29 Construction Method Construct Trestle / Install Micropiles for Trestle

30 Construction Method Advance Crane

31 Construction Method Construct Next Trestle Span

32 Construction Method Construct Footings and Set Precast Pier Segments

33 Construction Method Mobilize Segment Loader

34 Construction Method Erect Precast Segments with Segment Loader

35 Erect Superstructure in Balanced Cantilever

36 Completed Structure

37 Project Schedule Notice to Proceed January 2010 Current Progress Scheduled Completion Fall 2011 Foothills Parkway Bridge 2 Rendering EFLHD, Richard McDaniel

38 Foothills Parkway Bridge No. 2 Design Build Project