Transcript Case Study
Approaches to Historic Bridge Rehabilitation
Case Study #4
Robert A. Booth (Winchester) Bridge
Benjamin Tang, P.E. Bridge Preservation Manager
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Case Study #4
Robert A. Booth (Winchester) Bridge
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One of several reinforced concrete ribbed deck arches designed by Conde McCullough and built in
1924.
Architecture features include Roman & Gothic details, series of arches, cantilevered balconies and
lancet-arched balustrade railings.
Length: 1 @ 62’ + 7 @ 112’ + 1 @ 41’-8” = 887’- 8”
Span Type: 7 delicate arched spans, open spandrel columns, lancet-arched spandrel walls
supporting the deck & roadway
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Winchester Bridge / North Umpqua R.
Date of Rehab: 2007
Cost of Rehab Project: $9.93 M
low bid
Designed by Conde McCullough,
1922; Rehab. By Mats Halvardson,
2007
Amacher Park
Kolhagen
House
OR-CA RR
I-5 Steel Bridge
Winchester Bridge
Client/Owner: Oregon
Department of Transportation
Parking
Contractor: Hamilton
Construction Co., Springfield, OR
Fish Ladder
Winchester Dam
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Significant Issues Associated With Project
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Historic Bridge Preservation
Cultural Resources Tourism
Safety
Corrosion & Deterioration
Capacity & Load Rating
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Historic Bridge Preservation
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Dedicated multi-disciplinary team (structural,
mechanical, corrosion, and electrical
engineers)
Identify, assess and prioritize needed bridge
work
Methods: pressure grouting or pumped
concrete repairs, FRP composites
strengthening, precasting of replacement
elements, cathodic protection, recoating,
microsilica deck overlay…
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Cultural Resource & Tourism
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National Register Listed Winchester Dam (ca. 1880)
Amacher Park
Oregon & California Railroad Corridor (ca.1870’s)
1904 Kolhagen Ranch House
Boat ramps and sport fishing along the river
Historic steel bridge (Interstate 5) upstream.
Access
Parking
Pedestrian & Bikers
Fish ladder viewing area
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Safety
19’-4”
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Narrow Roadway Width
No Curb/Shoulders
Sight Distance
Straightening a curve on the North end
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Comparison of original deck and new deck
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36-inch rail
Stealth Rail – Precast in 3 staged fabrication
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42-inch rail
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Corrosion and Deterioration
Beams – worst at joints
Steel rebar with section loss
Cracks and spalls
Drainage
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How Significant Issues Were Resolved
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New widened deck, sidewalk, stealth rails
New deck joints (asphalt plug joints)
New brackets and wider overhangs
Existing - Removed to sound concrete
Pressured grout or Pumped concrete into formed repairs
CFRP strengthening/structural capacity (H-15 to HS20)
Added drainage for run-off in new deck
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Lessons Learned/Conclusions
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Bridge Preservation Program and Policy in General
Long-term objectives with funding support
Sustainable program strategies
Extending service life of historic structure
Implement “just in time” preservation strategies
Corrosion protection systems
Corrosion resistance and high performance materials (FRP, SS…)
Trained staffs
Developed multi-disciplinary engineers in bridge preservation
NACE, SSPC, NHI, training/certification
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Lesson Learned/Conclusions
Early coordination with all stakeholders and regulators
Contractor’s experience and prequalification
Public support to allow closing the bridge
Continuous construction support
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