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Bob GrubbsLead Bridge EngineerODOT Region 3, Tech Center
Lessons LearnedFAST 14, Boston MAFHWA Highways for Life Showcase
• 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:
• 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
• 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
A day in August 2010
Conventional Construction• 5 stages • 4 years• Worker safety issues• Concern of life of existing
structures
Construction OptionsConventional -vs- ABC
• 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
Existing Condition of BridgesWhat there is to work with
Bad decks combined with bad girders
Prep for ABCPrepare existing bridges
Install temporary support for existing bridges
Prep for ABCPrepare existing bridges
Prepare beam seats for new girders
Prep for ABCPrepare existing bridges
Sometimes this requires modifications
Accelerated Bridge ConstructionStep 1 – Friday evening
Transform road from 8-lanes to 4-lanes
Accelerated Bridge ConstructionStep 2 – Friday night
Demolish the bridges
Accelerated Bridge ConstructionStep 3 – Saturday morning
Demo completed, ready to place prefab superstructure
Accelerated Bridge ConstructionStep 3 – Saturday morning
Place prefabricated superstructure
Accelerated Bridge ConstructionStep 3 – Saturday morning
Place prefabricated superstructure
Accelerated Bridge ConstructionStep 4 – Saturday afternoon
Prepare joints for closure pour
Accelerated Bridge ConstructionStep 4 – Saturday afternoon/evening
Closure pour
Accelerated Bridge ConstructionStep 5 – Sunday
Pave bridge and place barrier
Accelerated Bridge ConstructionConstruction Video
Play video here
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
Lessons LearnedMy observations
• The short time line for design and construction created a “sense of urgency” that made the project successful
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?”
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
Lessons LearnedMy observations
• Formed teams with other agencies, they own the project too
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
Can we do this in Oregon?Isthmus Slough Bridge
• ABC methods used• 250-ft of bridge replaced with 13 days of traffic interruption
QUESTIONS?
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