Approaches to Historic Bridge Rehabilitation Case Study #4 Robert A. Booth (Winchester) Bridge Benjamin Tang, P. E. Bridge Preservation Manager 1
Case Study #4 Robert A. Booth (Winchester) Bridge One of several reinforced concrete ribbed deck arches designed by Conde Mc. Cullough 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 2
Case Study #4 Winchester Bridge / North Umpqua R. Date of Rehab: 2007 Cost of Rehab Project: $9. 93 M low bid Designed by Conde Mc. Cullough, 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 Fish Ladder Construction Co. , Springfield, OR Winchester Dam 3
Case Study #4 Significant Issues Associated With Project Cultural Resources Tourism Safety Corrosion & Deterioration 4 Historic Bridge Preservation Capacity & Load Rating
Case Study #4 Historic Bridge Preservation Identify, assess and prioritize needed bridge work 5 Dedicated multi-disciplinary team (structural, mechanical, corrosion, and electrical engineers) Methods: pressure grouting or pumped concrete repairs, FRP composites strengthening, precasting of replacement elements, cathodic protection, recoating, microsilica deck overlay…
Case Study #4 Cultural Resource & Tourism 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 6 Fish ladder viewing area
Case Study #4 Safety 19’-4” Narrow Roadway Width No Curb/Shoulders Sight Distance Straightening a curve on the North end 7
Case Study #4 Comparison of original deck and new deck 8
Case Study #4 36 -inch rail Stealth Rail – Precast in 3 staged fabrication 9 42 -inch rail
Case Study #4 Corrosion and Deterioration Beams – worst at joints Steel rebar with section loss Cracks and spalls Drainage 10
Case Study #4 How Significant Issues Were Resolved 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 HS 20) Added drainage for run-off in new deck 11
Case Study #4 Lessons Learned/Conclusions 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 12
Case Study #4 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 13
Скачать презентацию Approaches to Historic Bridge Rehabilitation Case Study 4
da29812ca06c5a03d8a9b9953012e254.ppt