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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

  • A/E
  • 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, Surveying, QC Testing

  • Marine Package
  • All Other Open Bid

Packages
Structural Steel Package

Cost

65
5
40 20
40
5
40 15

DMWESB Participation Safety Record

  • 15
  • 10

15
10 15
15 15

Key Personnel Relative Experience

10
5
10
5

  • 10
  • 10

5

Sustainability Work Plan

5
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

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

  • JANUARY 19TH, 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

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    Capital Budget fy2013 adopted budget Table of Contents Introduction ������������������������������������������������������������������������������������������������������������������������������������������������������������������������3 The County’s Capital Portfolio ��������������������������������������������������������������������������������������������������������������������������������������������� 3 The County’s Capital Budget Planning and Prioritization ������������������������������������������������������������������������������5 Financing for the Capital Budget ��������������������������������������������������������������������������������������������������������������������������������6 Major Capital Projects ����������������������������������������������������������������������������������������������������������������������������������������������������8 Replacing the Sellwood Bridge �������������������������������������������������������������������������������������������������������������������������������������������� 8 East County Courthouse���������������������������������������������������������������������������������������������������������������������������������������������������������� 9 U2 Block Health Headquarters ������������������������������������������������������������������������������������������������������������������������������������������10 New Countywide Budget System ��������������������������������������������������������������������������������������������������������������������������������������11