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Sellwood Bridge May 8, 2018 Project Overview Project Overview SELLWOOD BRIDGE MAY 8, 2018 PROJECT OVERVIEW PROJECT OVERVIEW • Procurement: CMGC • Owner: Multnomah County • Location: Portland, Oregon • Contract Value: $227,000,000 • Construction Timeline: • Started: December 2011 • Completed: January 2017 PROJECT TEAM • Agencies • Multnomah County • City of Portland • Oregon Department of Transportation • Federal Highway Administration • Designers/Consultants • T. Y. Lin International • CH2M Hill • David Evans and Associates • General Contractor • Slayden/Sundt Joint Venture HISTORY • Originally a Ferry Crossing • Original Sellwood Bridge - Opened 1925 • In depth inspections - mid 1980’s & 2003 • Further “Band aids” were installed • Loads Restrictions enforced in 2004 • In-depth inspection/evaluation 2005 • Structural rating - 2 out of 100 Local RR OR 43 to Tracks Portland Cemetery Willamette River Sellwood Landslide Riverpark and Sellwood Harbor OR 43 to Condos Lake Oswego CMGC PROCUREMENT CMGC CONSTRUCTION MANAGER/GENERAL CONTRACTOR • Collaboration between Owner, Designer, and Contractor • Up to Date Market Pricing • Design development Owner • Constructability Reviews • Value Engineering • ROW/TCE acquisition & Phasing • Schedule Development • Risk Management A/E Collaboration GC • Other Owner Drivers: • Sustainability • Public involvement • Minority Goals PRECONSTRUCTION • 7 Amendments (Design Packages) • Able to release packages early to start work • Shoofly • Landslide • Condo Demo/Reconstruct • Main Bridge - GMP • 60%, 90%, and 100% cost estimates • After each pricing exercise adjustments are made to validate the design aligns with the owners budget • Design Modifications • Value Engineering • Material Selections • Means and Methods Evaluated CONTRACTING PLAN • DMWESB Goal - 20% • Created a Contracting Plan with the Owner: • 4 Categories • Project Final DMWESB: • 20.41% • $45,491,206 SMALL GC PACKAGES • 4 scopes of work separated into GC-type packages • Subcontractor solicitation, best value scoring, and scope management for the entire scope. • Condo Demolition and Reconstruct - $3.7M • Macadam Bay Neighborhood – $2.7M • Powers Marine Park – $300,000 • Miles Place & Butterfly Park – $300,000 BEST VALUE SCORING Maximum Available Points Selection Criteria Multi-Use Bridge, Marine Package All Other Open Bid Structural Steel Package Surveying, QC Testing Packages Cost 65 40 40 40 DMWESB Participation 5 20 5 15 Safety Record 15 10 10 15 Key Personnel 15 15 15 Relative Experience 10 10 10 10 Sustainability 5 5 5 5 Work Plan 15 Total Points 100 100 100 100 CRAFT DEVELOPMENT • Apprenticeship Program • Required 20% Apprentice per trade per subcontract for all contracts over $100,000 • Craft Diversity for Total Project • 14% Women • 20% Minority CONSTRUCTION CHALLENGES MAINTAINING VEHICLES/PEDESTRIANS • 30,000 Vehicles/Day • Heavily use by Pedestrians/Bicyclists Issue to be solved by proposers: • Build bridge on exact footprint • No more than 30 days full closure ORIGINAL PLAN • Multnomah County intended to build the new bridge in halves. • Maintain the existing structure while building the south half • Demolish the existing bridge • Build the North half • Downfalls • Environmental impacts due to additional cofferdams • Public/Worker safety • Redundant Structural Features • Schedule • Cost THE SHOOFLY • Use the existing Steel Truss for the Temporary Detour • Install Temporary Piers in the River • Construct new temporary approaches • Translate the steel truss onto the Temporary Piers • Use Shoofly while the new Bridge was constructed Approach to shoofly Pile driving for temporary bents THE TASK • Truss • 6.8 million pounds (3,400 tons) • 1,095 feet long • Translate • 66 feet North at West End • 33 feet North at East End • 7:30am to 9:30pm (14 hours) • Jacks • Horizontal – 5 pairs of 165,000lb capacity/jack • Lifting – 40 (8 per pier) of 330,000 lb capacity/jack JANUARY 19 TH , 2013 “THE MOVE” SHOOFLY COMPLETE SHOOFLY BENEFITS • Cost Savings - $5,000,000 • Cut 1 year off the schedule • Reduced the Environmental Impacts • Simplified the Phasing • Design Redundancy was eliminated – Sleeker Structure • Safety – Separated Public from Workers • Less the 20 days of bridge closures for the entire project LANDSLIDE STABILIZATION LANDSLIDE • Entire West Approach constructed on an ancient landslide • Original Bridge moved 3’ • Stabilization Shear Piles and Ground Anchors • Landslide Monitored throughout construction to establish final design requirements LANDSLIDE STABILIZATION 72” Diameter Shafts - 2,800 LF Ground Anchors – 92 EA LANDSLIDE STABILIZATION Ground Anchors were restressed to final design after the Bridge was completed PERCHED BOX CAISSONS TRADITIONAL IN-WATER PIERS • 90-foot sheet piles driven into cobbles & boulders • In-water-work Restrictions & Schedule Impacts • Large Concrete Seal & Footing • Full Height Piers • Scour would be up to 65 feet • Costly PERCHED BOX CAISSONS • No sheet piles driven into cobbles & boulders • In-water-work Reduced • Eliminated Large Concrete Seal & Footing • Reduced Pier Height • Minimal Scour • Reduced Cost Drilled shaft foundation construction Soffit for perched box cofferdam Perched box cofferdam complete Concrete for soffit in perched box (8) Cylinder Jacks High Tension Rods Ready for pier wall construction Jacks utilized to submerge cofferdam xxxxxxxxxxxxxx xxxxxxxxxxxxxx • Pier wall complete prior to removal of cofferdam ADDITIONAL BENEFITS Structure Steel Concrete Dredging Traditional Cofferdam 1,170 Tons 6,130 CY 13,100 CY Perched Box Caisson 390 Tons 380 CY 0 CY Savings 780 Tons 5,750 CY 13,100 CY • Easier Permitting due to lower total pile count • Construction schedule not limited to in-water work restrictions SHOOFLY REMOVAL LAST STEP • Removal of the Shoofly: • 4 Span Steel Truss • 199’ – 246’ Long • 372,000 – 480,000 LB • 2 Approaches • 5 Temporary Bents • 120 Pipe Pile • In Water Work Window: • July 10 th – October 15 th LOWER THE TRUSSES • Install temporary tension members at each bent and other internal bracing due to the reactions when the truss was cut • Use 4 - HSL 2000 Heavy Lifting Strand Jack System to lower each span • Lower each span onto barges and transport to a recycling facility in Vancouver, WA SEQUENCE Install Temporary Bracing Lowering truss sections Lowering a truss section Floating a truss section on a barge FINAL PRODUCT • Vehicle & Pedestrian Safety & Increased Capacity • Efficient West Interchange • 3 Parks & Hike/Bike Trails .
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