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Approaches to Historic Bridge Rehabilitation Case Study #2

Approaches to Historic Bridge Rehabilitation Case Study #2. Lake Park North Lion Bridge Rehabilitation Milwaukee, Wisconsin Darrell Berry, PE, SE. Case Study #2. Lake Park North Lion Bridge. Steel arch with concrete deck Originally built in 1896, narrowed in the 1960s

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Approaches to Historic Bridge Rehabilitation Case Study #2

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  1. Approaches to Historic Bridge RehabilitationCase Study #2 Lake Park North Lion Bridge Rehabilitation Milwaukee, Wisconsin Darrell Berry, PE, SE

  2. Case Study #2 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 North Lion Bridge Lake Michigan Milwaukee, Wisconsin

  3. Case Study #2 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.

  4. Case Study #2 Significant Issues Associated With Project • Arch Structure • Railing • Stone Facing on Abutments • Lion Statues

  5. 1. Steel arch structure, including bearings & concrete deck

  6. Case Study #2 How Arch Issue Was Resolved • 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

  7. Case Study #2 2. Metal Railings

  8. Case Study #2 How Railing Issue Was Resolved • 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.

  9. Case Study #2 3. Stone facing on abutments

  10. Case Study #2 How Stone Facing Issue Was Resolved • 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.

  11. Case Study #2 4. Lion Statues

  12. Case Study #2 How Lion Statue Issue Was Resolved • 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.

  13. Case Study #2 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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