boeing north bridge: lessons learned in accelerated … · boeing north bridge: lessons learned in...
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Boeing North Bridge: Lessons Learned in Accelerated Bridge Construction
Gregory A. Banks, Myles Parrish, Charles W. Spry
WSDOT ABC WorkshopApril 2015
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Project Overview ‐ Location
• Located in Renton, WA
RENTON
PROJECT SITE
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Project Overview – Site Layout
Boeing Company
Lake Washington
Existing Bridge
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Project Overview – Existing Bridge Condition
• Bridge Seismically Deficient • Bridge is on critical path for production • Damage or loss poses economic risk
1940 Construction1969 Construction
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Project Overview – Replacement BridgeGeneral
• 3-Span Continuous (245-feet total length)• Main Span: 134’-0” | End Spans: 55’-6”
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• Prefabricated Bridge Elements– Steel Plate Girders– Full depth precast deck panels– Columns and Crossbeams
Project Overview – Replacement BridgeGeneral
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Project Overview – Replacement BridgeSteel Plate Girders
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Project Overview – Replacement BridgeFull Depth Precast Deck Panels
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Project Overview – Replacement BridgeFull Depth Precast Deck Panels
8’-0”
50’-0”
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Project Overview – Replacement BridgeFull Depth Precast Deck Panels
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Project Overview – Replacement BridgeFull Depth Precast Deck Panels
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Project Overview – Replacement BridgeColumns and Crossbeams
6’-6” Drilled Shafts150-foot length
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Project Overview – Replacement BridgeColumns and Crossbeams
4’-0” Precast Columns
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Project Overview – Replacement BridgeColumns and Crossbeams
Stage 1 – Precast Crossbeam
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Project Overview – Replacement BridgeColumns and Crossbeams
Stage 2 – CIP Crossbeam Infill
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Project Overview – Replacement BridgeColumns and Crossbeams
-StraightPre-tensioning-DrapedPost-tensioning
SECTION BSECTION A SECTION C
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Project Overview – Replacement BridgeConnections
Column to Crossbeam
Column to Shaft
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Project Overview – Replacement BridgeConnections: Column‐to‐Cap Beam
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Project Overview – Replacement BridgeConnections: Column‐to‐Shaft
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Why ABC?
• Schedule Savings• Bridge on critical path for 737MAX rollout• Prefabricated elements
– Added float to the construction schedule – Environmental benefits with reduced CIP
concrete over salmon bearing waters
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Construction Constraints/ScheduleBoeing Production
Boeing Company
Renton Municipal Airport
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Construction Constraints/ScheduleEnvironmental
SCHEDULED 737MAX
ROLL-OUT
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1. EXISTING 2. EXISTING + TEMP
3. NEW BRIDGE + TEMP 4. NEW BRIDGE
Construction Constraints/Schedule
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Construction Constraints/ScheduleRenton Airport Height Threshold
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Construction – Change Proposal
• Slow Start-Up– Delayed Permits– Coordination (Airport requiring night work)– Late commissioning of temporary bridge
• Permit Adjustment– Allowed for large cofferdams– Allowed for falsework at Piers 2 & 3– Contractor submitted a no-cost change
proposal to switch substructure to CIP
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Construction – Change Proposal
• Change Proposal Details– Safety Concerns– Quality Concerns– Schedule Concerns
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Construction ‐ Change Proposal
• Safety Concern: Setting of precast crossbeam
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Construction ‐ Change Proposal
• Quality Concern: Grouting, # Joints, Tolerances
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Construction ‐ Change Proposal
• Schedule Concern: Night work with no time savings
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Construction ‐ Change Proposal
• Schedule Concern: Night work with no time savings
• Response:– Several opportunities for time savings– Crane required regardless
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Construction ‐ Precast Deck Panels
• Precast Deck Construction Details– UHPC (Ultra High Performance Concrete) – Girder Fabrication and Panel Erection
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Lessons Learned
• Understand Construction Constraints/Risks
• Cost Savings with Standards & Repetition
• Certified PCI Prefabricator Required?
• Required Equipment Size
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Questions?
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Design Examples
• Developed for the FHWA Technology Partnership Program
• Culminated in demonstration project completed by WSDOT.
• Marked excellent collaboration between Owner, Researchers, Designers, Precaster, and Contractor
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Reports Available from FHWA –Highways for LIFE
• Final Report• Appendices
A. Design SpecificationsB. Design Example No. 1C. Design Example No. 2
• Testing Report – Spread Footings
• Testing Report – Drilled Shafts
http://www.fhwa.dot.gov/hfl/
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• Design Specifications– Formatted in AASHTO Guide Spec Language– Address design with HfL bent details
• Construction Specifications– Material controls– Tolerance control– Recommendations for contract control
Reports Available from FHWA –Highways for LIFE
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Example Resources – NCHRPPrecast Bridge Elements and Systems (PBES)
ABC – PBES is now widely deployed in lower seismic regions
A challenge for ABC is development of PBES for higher seismic regions
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Concept of “Technology Readiness Level”
Technology Readiness Level (TRL) % of development completeTRL Description 0-25 25-50 50-75 75-100
1 Concept exists2 Static strength predictable3 Non-seismic deployment4 Analyzed for seismic loading5 Seismic testing of components6 Seismic testing of subassemblies7 Design & construction guidelines8 Deployment in seismic area9 Adequate performance in EQ
% of development complete0-25 25-50 50-75 75-100
% of development complete0-25 25-50 50-75 75-100
% of development complete0-25 25-50 50-75 75-100
% of development complete0-25 25-50 50-75 75-100
% of development complete0-25 25-50 50-75 75-100TRL
123456789
% of development complete0-25 25-50 50-75 75-100
Bar Couplers Grouted Ducts Pocket Conns.
Socket Conns. Hybrid Systems Integral Conns. Emerging Technology
1. Reference: NCHRP 698 – Red fill blocks = work done since report was published.2. NCHRP 12-102 – Current project to address TRL 7, Design & Construction Guidelines
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Additional Helpful Resources
TRB AFF10(3): Subcommittee for ABChttps://sites.google.com/site/trbaff103/home