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1 Dennis L. Edwards Tunnel Constructability Review February 5, 2010 East Portal looking west circa 1940 East Portal looking west circa 2001 Nathan K. Potter,

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Presentation on theme: "1 Dennis L. Edwards Tunnel Constructability Review February 5, 2010 East Portal looking west circa 1940 East Portal looking west circa 2001 Nathan K. Potter,"— Presentation transcript:

1 1 Dennis L. Edwards Tunnel Constructability Review February 5, 2010 East Portal looking west circa 1940 East Portal looking west circa 2001 Nathan K. Potter, PE Project Manager Oregon Department of Transportation Randy G. Hinderer, PE Senior Project Manager LOCHNER

2 2 Agenda Introduction Project Overview Constructability Review Agenda

3 3 Dennis L. Edwards Tunnel Originally called the Sunset Tunnel, construction was completed by the Works Progress Administration (WPA) in The tunnel was renamed after Dennis Edwards, a member of the District 2A staff who was killed during inspection activities in January 1999 when part of the tunnel collapsed. Closure and detour duration was approximately 5 weeks. Technical Data US26 (Sunset) (Highway No. 047) Mile point: 40.9 Bridge No Posted Speed: 55 MPH Average Daily Traffic (ADT): 6,700 Average Daily Truck Traffic (ADTT): 12% (804)

4 4 Dennis Edwards Tunnel (MP 40.90)

5 5 Project Objectives Reline the tunnel Lighting Improvements Drainage Improvements Freight industry has asked to ODOT to consider vertical improvements Bicycle/Pedestrian Improvements

6 6 Historic Considerations Model of the West Portal The builders East Portal looking west The completed masonry portal

7 7 1 2 Tillamook Railroad Over Crossing (MP 42.50) Dennis Edwards Tunnel (MP 40.90) Timber Road 10 miles 11 Miles OR Miles Timber Road Columbia County Washington County Oregon 47 Length Restricted 65 Truck-tractor and Semi- trailer Total Detour Route = 26 Miles Distance on US 26 = 11 Miles Additional Distance = 15 Miles Local Tunnel Detour 1 2

8 8 Regional Detours (Seaside to I-405) US 26=79 Miles US 30=115 Miles Difference36 Miles

9 9 Tunnel Profile

10 10 Edwards Tunnel, West Portal, March 2000

11 11 Edwards Tunnel, STA 0+00 Looking East, March 2000

12 12 Edwards Tunnel, STA 0+50 Looking East, March 2000

13 13 Edwards Tunnel, STA 1+00 Looking East, March 2000

14 14 Edwards Tunnel, STA 1+50 Looking East, March 2000

15 15 Edwards Tunnel, STA 2+00 Looking East, March 2000

16 16 Edwards Tunnel, STA 2+50 Looking East, March 2000

17 17 Edwards Tunnel, STA 3+00 Looking East, March 2000

18 18 Edwards Tunnel, STA 3+50 Looking East, March 2000

19 19 Edwards Tunnel, STA 4+00 Looking East, March 2000

20 20 Edwards Tunnel, STA 4+50 Looking East, March 2000

21 21 Edwards Tunnel, STA 5+00 Looking East, March 2000

22 22 Edwards Tunnel, STA 5+50 Looking East, March 2000

23 23 Edwards Tunnel, STA 6+00 Looking East, March 2000

24 24 Edwards Tunnel, STA 6+50 Looking East, March 2000

25 25 Edwards Tunnel, STA 7+00 Looking East, March 2000

26 26 Edwards Tunnel, STA North Side, March 2000

27 27 Edwards Tunnel, East Portal, March 2000

28 28 Edwards Tunnel, Looking East from East Portal, March 2000

29 29 Edwards Tunnel, North Side of East Portal, March 2000

30 30 System Drainage

31 31 Alternative 1: Lining Only Replaces the tunnel lining Replaces / rehabilitates the tunnel PCC floor and drainage system Installs new lighting system Existing portals and stone masonry will remain untouched.

32 32 Alternative 2: Floor Lowering Clearance achieved by removing the existing lining consisting of steel and timber sets, removing the rubble and gravel behind the existing liner, and replacing the liner with rock bolted shotcrete directly to the exposed siltstone bedrock. Roadway elevation will be lowered throughout the tunnel approximately 2.5 feet to achieve vertical clearance, transitioning back to existing grade approximately 700 feet on both tunnel approach sections. Existing portals and stone masonry will remain intact, however underpinning the portal masonry and associated concrete wall structure with new footings will be necessary.

33 33 Alternative 3: Portal Raising Clearance achieved by removing the existing lining consisting of steel and timber sets, removing the rubble and gravel behind the existing liner, and replacing the liner with rock bolted shotcrete directly to the exposed siltstone bedrock. Existing portals will be raised approximately 2.5 feet to achieve vertical clearance. RequireS specialized work for the historic portal stone masonry, which will be removed and replaced on a new portal wall structure at a higher elevation.

34 34 Constructability Review Agenda Constructability Review Agenda GOAL: What is the highway closure duration? Equipment –Dimensions –Location –What equipment will be required to raise the portals, excavate, etc., will it fit in the tunnel Methods –Contingency plans for unknowns –Roadway undercutting –What protection / shoring methods will be required for the portals? –Lowering the tunnel floor and roadway: –Historic Stone Portal Removal and Reconstruction –Specialty work required to maintain material integrity during removal and reconstruction –Timber Lining Demolition –Shotcrete Lining Demolition Materials –Concrete –Masonry materials –Historic Stone Portal Underpinning Staging –Raising Portals –Re-Lining –Is it feasible to lower the tunnel floor, construct temporary ties into existing roadway, and stage approach roadway construction with single lane closures? –Is there any methodology to keep the highway partially open? Durations –Existing lining removal –Roadway lowering –Rising portals: reconstruction verses lifting –Full closure versus partials

35 35 Tunnel Profile


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