1 dennis l. edwards tunnel constructability review february 5, 2010 east portal looking west circa...
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Dennis L. Edwards Dennis L. Edwards TunnelTunnel
Constructability ReviewFebruary 5, 2010
East Portal looking west circa 1940
East Portal looking west circa 2001
Nathan K. Potter, PEProject Manager
Oregon Department of Transportation
Randy G. Hinderer, PESenior Project Manager
LOCHNER
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AgendaAgenda
• Introduction • Project Overview • Constructability Review Agenda
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Dennis L. Edwards TunnelDennis L. Edwards Tunnel
Originally called the Sunset Tunnel, construction was completed by the Works Progress Administration (WPA) in 1940.
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 DataUS26 (Sunset) (Highway No. 047)Mile point: 40.9Bridge No. 02552Posted Speed: 55 MPHAverage Daily Traffic (ADT): 6,700Average Daily Truck Traffic (ADTT): 12% (804)
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Dennis Edwards Tunnel(MP 40.90)
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Project ObjectivesProject Objectives
• Reline the tunnel• Lighting Improvements• Drainage Improvements• Freight industry has asked to ODOT
to consider vertical improvements• Bicycle/Pedestrian Improvements
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Historic ConsiderationsHistoric ConsiderationsModel of the West Portal
The builders
East Portal looking west
The completed masonry portal
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Tillamook Railroad Over Crossing (MP 42.50)
Dennis EdwardsTunnel(MP 40.90)
Tim
ber
Ro
ad10
mile
s
11 Miles
OR
47
16 Miles
Timber RoadColumbia CountyWashington County
Oregon 47Length Restricted65’ Truck-tractor and Semi-trailer
Total Detour Route = 26 MilesDistance on US 26 = 11 Miles
Additional Distance = 15 Miles
Local Tunnel DetourLocal Tunnel Detour
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Regional DetoursRegional Detours (Seaside to I-405)(Seaside to I-405)
US 26 = 79 MilesUS 30 = 115
Miles
Difference 36 Miles
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Tunnel ProfileTunnel Profile
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10Edwards Tunnel, West Portal, March 2000
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11Edwards Tunnel, STA 0+00 Looking East, March 2000
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12Edwards Tunnel, STA 0+50 Looking East, March 2000
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13Edwards Tunnel, STA 1+00 Looking East, March 2000
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14Edwards Tunnel, STA 1+50 Looking East, March 2000
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15Edwards Tunnel, STA 2+00 Looking East, March 2000
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16Edwards Tunnel, STA 2+50 Looking East, March 2000
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17Edwards Tunnel, STA 3+00 Looking East, March 2000
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18Edwards Tunnel, STA 3+50 Looking East, March 2000
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19Edwards Tunnel, STA 4+00 Looking East, March 2000
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20Edwards Tunnel, STA 4+50 Looking East, March 2000
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21Edwards Tunnel, STA 5+00 Looking East, March 2000
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22Edwards Tunnel, STA 5+50 Looking East, March 2000
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23Edwards Tunnel, STA 6+00 Looking East, March 2000
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24Edwards Tunnel, STA 6+50 Looking East, March 2000
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25Edwards Tunnel, STA 7+00 Looking East, March 2000
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26Edwards Tunnel, STA 7+71.5 North Side, March 2000
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27Edwards Tunnel, East Portal, March 2000
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28Edwards Tunnel, Looking East from East Portal, March 2000
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29Edwards Tunnel, North Side of East Portal, March 2000
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System DrainageSystem Drainage
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Alternative 1: Lining OnlyAlternative 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.
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Alternative 2: Floor LoweringAlternative 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.
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Alternative 3: Portal RaisingAlternative 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.
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Constructability Review AgendaConstructability Review AgendaGOAL: 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
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Tunnel ProfileTunnel Profile