Approaches to Historic Bridge Rehabilitation Case Study #2
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Transcript of Approaches to Historic Bridge Rehabilitation Case Study #2
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Lake Park North Lion Bridge RehabilitationMilwaukee, Wisconsin
Darrell Berry, PE, SE
Approaches to Historic Bridge Rehabilitation
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Lake Park North Lion Bridge Steel arch with concrete deck
Originally built in 1896, narrowed in the 1960s
Length: 90 feet; Width: 10 feet clear Single span steel arch Design Live Load: 85 psf or 15,000 lb.
vehicle
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North Lion Bridge
Lake Michigan
2Milwaukee, Wisconsin
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Lake Park North Lion Bridge Rehabilitation
Owner: Milwaukee County Department of Parks, Recreation and Culture
Design Engineer: Mead & Hunt, Inc.
General Contractor: Vista Design & Construction, LLC
Project Cost: $1.6 Million
Project dates: started Feb 2009,
completed Oct 2009.
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Significant Issues Associated With Project
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1. Arch Structure
2. Railing
3. Stone Facing on Abutments
4. Lion Statues
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1. Steel arch structure, including bearings & concrete deck
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How Arch Issue Was Resolved
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Deteriorated structural steel was removed and replaced, with details matching original.
Bearings were removed and replaced.
Concrete deck was removed and replaced Precast concrete panels Cast-in-place concrete surface
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2. Metal Railings
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How Railing Issue Was Resolved
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Railings were removed from bridge and delivered to a fabrication shop.
New finials were added and made larger to fill the openings.
Edges were welded to uprights.
Railings were painted and reinstalled.
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3. Stone facing on abutments
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How Stone Facing Issue Was Resolved
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Missing stones were replaced with matching stones.
Entire abutments were tuckpointed, with color to match existing.
All surfaces were gently cleaned to remove moss and dirt.
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4. Lion Statues
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How Lion Statue Issue Was Resolved
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110 year old statues were in good condition with minimal graffiti.
Cleaning used a gentle process with water and light power wash.
Digital 3D image will be prepared in near future.
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Lessons Learned/Conclusions Rehabilitated bridge is part of beloved, historic park.
Bridge and lion statues are enduring symbols of a celebrated Milwaukee landmark.
Cooperation and collaboration between all parties lead to an extremely successful, award-winning project.
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