bob grubbs lead bridge engineer odot region 3, tech center lessons learned fast 14, boston ma fhwa...
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Bob GrubbsLead Bridge EngineerODOT Region 3, Tech Center
Lessons LearnedFAST 14, Boston MAFHWA Highways for Life Showcase
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• Longer-lasting highway infrastructure using
• Innovations to accomplish the
• Fast construction of
• Efficient and safe highways and bridges
What is ‘Highways for Life’?FHWA program that promotes:
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• Replace 14 deteriorated bridge superstructures • Minimize impacts to travelers and communities• Reduce the duration of construction as much as possible
(Complete the construction ASAP)• Use cutting-edge innovations• Communicate to the public
FAST14 – Boston Ma.Project Mission
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• Main route from Boston to Northern New England • Over 200,000 ADT with high morning and afternoon peaks
(highest ADT I-5 Oregon is 150K, highest in R3=50K)• Bridges have deteriorated superstructures, deck and girders
Interstate-93Roadway Characteristics
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A day in August 2010
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Conventional Construction• 5 stages • 4 years• Worker safety issues• Concern of life of existing
structures
Construction OptionsConventional -vs- ABC
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• Design/Build procurement– Issued Notice-to-Proceed on February 7, 2011– Prep work began March 14
• Superstructure replacement– Superstructure replacement June 1 – Sept 1, 2011– Weekends only (except July 4th)
• Finish work to occur after September 1– Paving, rail, lighting, median, etc...
• All bridge replacements complete in 2011
Project TimelineNot just the construction was accelerated
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Existing Condition of BridgesWhat there is to work with
Bad decks combined with bad girders
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Prep for ABCPrepare existing bridges
Install temporary support for existing bridges
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Prep for ABCPrepare existing bridges
Prepare beam seats for new girders
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Prep for ABCPrepare existing bridges
Sometimes this requires modifications
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Accelerated Bridge ConstructionStep 1 – Friday evening
Transform road from 8-lanes to 4-lanes
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Accelerated Bridge ConstructionStep 2 – Friday night
Demolish the bridges
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Accelerated Bridge ConstructionStep 3 – Saturday morning
Demo completed, ready to place prefab superstructure
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Accelerated Bridge ConstructionStep 3 – Saturday morning
Place prefabricated superstructure
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Accelerated Bridge ConstructionStep 3 – Saturday morning
Place prefabricated superstructure
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Accelerated Bridge ConstructionStep 4 – Saturday afternoon
Prepare joints for closure pour
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Accelerated Bridge ConstructionStep 4 – Saturday afternoon/evening
Closure pour
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Accelerated Bridge ConstructionStep 5 – Sunday
Pave bridge and place barrier
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Accelerated Bridge ConstructionConstruction Video
Play video here
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Lessons LearnedMy observations
Very creative Incentive/Disincentive• Incentives based on meeting overall completion date milestones
($7-million)• Disincentive based on getting road open on Monday morning
– One late Monday -$3.2-million– Two late Mondays -$4.8-million– Three late Mondays -$7-million– PLUS disincentive for late opening
• @ 5:00 -$450K• @ 5:15 -$100K• @ 5:30 -$150K• @ 5:45 -$200K• @ 6:00 -$250K• Total maximum per day = $1.15million
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Lessons LearnedMy observations
• The short time line for design and construction created a “sense of urgency” that made the project successful
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Lessons LearnedMy observations
• They did not ask “What should we do?”• They asked the public
“Here is what we are doing, how can we make it better?”
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Lessons LearnedMy observations
• The engineering is simple, the construction straight forward– To build it fast, make it simple– Less detail, fewer things to go wrong
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Lessons LearnedMy observations
• Formed teams with other agencies, they own the project too
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Lessons LearnedMy observations• Public outreach & communication very important
• The MassDOT Communications Team used– Used Traditional Methods of Communications
– Used Social Media
– Non-Conventional Methods of Communication• Billboards, message boards, state payroll checks, toll booth stickers/tickets
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Can we do this in Oregon?Isthmus Slough Bridge
• ABC methods used• 250-ft of bridge replaced with 13 days of traffic interruption
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QUESTIONS?