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 Tracks OR 43 to Portland Cemetery Willamette River Sellwood Landslide Riverpark and Sellwood Harbor Condos OR 43 to Lake Oswego CMGC PROCUREMENT CMGC CONSTRUCTION MANAGER/GENERAL CONTRACTOR •••Collaboration between Owner, Designer, and Contractor Up to Date Market Pricing Owner Design development ••Constructability Reviews Value Engineering ••••ROW/TCE acquisition & Phasing Schedule Development Risk Management Collaboration <ul style="display: flex;"><li style="flex:1">A/E </li><li style="flex:1">GC </li></ul>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, Surveying, QC Testing <ul style="display: flex;"><li style="flex:1">Marine Package </li><li style="flex:1">All Other Open Bid </li></ul>Packages Structural Steel Package Cost 65 5 40 20 40 5 40 15 DMWESB Participation Safety Record <ul style="display: flex;"><li style="flex:1">15 </li><li style="flex:1">10 </li></ul>15 10 15 15 15 Key Personnel Relative Experience 10 5 10 5<ul style="display: flex;"><li style="flex:1">10 </li><li style="flex:1">10 </li></ul>5Sustainability Work Plan 5 15 Total Points <ul style="display: flex;"><li style="flex:1">100 </li><li style="flex:1">100 </li><li style="flex:1">100 </li><li style="flex:1">100 </li></ul>CRAFT DEVELOPMENT • Apprenticeship Program • Required 20% Apprentice per trade per subcontract for all contracts over $100,000 • Craft Diversity for Total Project • 14% Women Minority • 20% 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 <ul style="display: flex;"><li style="flex:1">JANUARY 19TH, 2013 “THE MOVE” </li><li style="flex:1">SHOOFLY COMPLETE </li><li style="flex:1">SHOOFLY BENEFITS </li></ul>• 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

Sellwood Bridge May 8, 2018 Project Overview Project Overview

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