implementing abc on bridge replacement and rehabilitation
TRANSCRIPT
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Implementing ABC on Bridge Replacement andRehabilitation Projects Bala Sivakumar
T.H.E. Conference 2016
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Outline
Introduction to ABC
ABC Technologies & Methods
Implementing Bridge Moves
ABC Rehab Projects
ABC Replacement
Projects
Implementing Prefab
Systems
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What is ABC?
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What is ABC?
Accelerated Bridge Construction (ABC)
ABC is bridge construction that uses innovative methods to
reduce mobility impacts when replacing/rehabilitating existing bridges.
ABC is a platform for innovation
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Reasons for considering ABC include:• Heavily traveled route (high ADT)• Long or non-existent detours • Part-width construction is not a
preferred option
Reasons for ABC?
Cast-in-place construction is a sequential processABC allows work to be done in parallel – reduce schedule
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Reduces disruption to
traffic
ABC Advantages
Safer; reduces exposure of workers and public
Better quality control due to prefabricated
elements
Reduced environmental
impacts
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ABC Elements and Methods
ACCELERATED BRIDGE CONSTRUCTION
Prefabricated Elements &
Systems (PBES)
Accelerated Geo-tech Work
Rapid Demolition
Bridge Movement Technologies (SIBC /
SPMT)
Innovative Contracting
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Time Metrics for ABC – Mobility Impact Time
TRAFFIC IMPACTS WITHIN
Tier 1 24 hours
Tier 2 3 days
Tier 3 2 weeks
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ABC – National Perspective
• 2200 + ABC projects to date (2014)
• 43 states have used ABC (2014)
• Several states have ABC programs for statewide implementation
• ABC candidates are selected using a screening process
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ABC Technologies
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Full Depth Precast Deck Panels
Casting and curing decks is a slow process
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Pre-decked beams• Concrete deck bulb tees• Concrete Deck double
tees
MODULAR CONCRETE SUPERSTRUCTURE SYSTEMS
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Prestressed Deck Bulb Tee — NY Route 31
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NJDOT Route 18 Bridge Over Route 1Weekend Replacement
MODULAR STEEL SUPERSTRUCTURE SYSTEMS
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Prefabricated Abutment & Wingwalls
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• Build the entire bridge superstructure and then move it into place in a few hours.
• Bridge movement technologies:– Slide-In Bridge Construction (SIBC)– Self-Propelled Modular Transporters (SPMT)– Float-In– Launching / Skidding
Bridge Movement Technologies
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3 June 2008 17
Roll-Out l Roll-In Hood Canal Bridge, WSDOT
Before During After
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Roll-Out/Roll-In New York City Van Wyck Expressway
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Push/pull hydraulic jacks
Pulling with• strand jacks• power winch
Bridge Slide Systems
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Roller BearingsCoefficient of Friction: 5% of Vertical Load
Teflon-Coated Neoprene Bearing PadsCoefficient of Friction: 10% of Vertical Load
Slide Bearings
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Bridge Movement – Float-In
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Self Propelled Modular Transporter (SPMT)
What is an SPMT?• Multi-axle platform• Each axle pivots 360 degrees• Lifts, carries, sets large/heavy loads• Each axle moves independently
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Bridge Movement with SPMTs
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MassDOT Study• 2 similar parallel bridges: One conventional one ABC using PBES• Conventional = $ 224 / SF• ABC = $284 / SF• 27% cost differential; These are NE prices
FIU Study
• FIU compared costs using 53 ABC projects in the FHWA ABC database with similar conventional projects
• ABC costs were 20% higher on average
ABC COSTS
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• Design-Bid-Build• Design-Build• Construction Manager / General Contractor
ABC Contracting• Incentive / Disincentive based on user delay costs• A+B Bidding
ABC DELIVERY
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ABC Resources SHRP2 ABC Toolkit
• Sample ABC plans
• Sample ABC design calcs.
• ABC Specs / Special provisions
• ABC erection concepts
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Implementing PBES
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14 Day Bridge Replacement – Keg Creek Bridge, Council Bluffs, Iowa
• Total prefabricated bridge• 3 Spans• 14 day closure• 14 day ABC period• Opened November 1, 2011
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Oct 17, 2011
Nov 1, 2011
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Cross-Sections/Plan
UHPC Joints
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Prefabrication Yard Adjacent to Bridge – Iowa Bridge Farm
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93 K
168 K
Prefabrication of Abutments and Piers
52 K
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Precast Abutment Assembly – Days 3 and 4
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• Pier caps: 168 kips• Required two 110 ton cranes to lift into place
168 K
Precast Pier Assembly – Day 5
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112 K
Span – 70 ft
Erection of Superstructure Elements – Days 7 and 8
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Erection of the Superstructure Elements – Days 7 and 8
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• Full moment transfer
• No post-tensioning required
• Only 6 in. wide; low-permeability
• 25,000 psi strength• Steel fiber
reinforcement
Ultra High Performance Concrete Deck Closure Pours – Day 10
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Precast Approach Slab — Day 10
Precast SleeperSlab
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Time Lapse – 14 Day Replacement
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Implementing Slide-In Bridge Construction
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• Weekend Replacement• 20 Hr Closure
I-84 Bridges Slide-In Replacement — New York 2013
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• Over 75,000 ADT• 16% trucks• Existing bridges are too narrow for cross-overs• 3 Span bridge replaced with single span• One Saturday night closure per bridge
NY I-84 Bridges
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• NEXT beams• Precast approach slabs• UHPC closure pour
Superstructure Sections
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New Superstructures on Falsework
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New Abutment Construction
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Slide-In Replacement Concept
Slide SurfaceTemporary end span
Modular walls
During Slide
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End Diaphragm and Slide Shoe
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Bridge Slide – October 21, 2013
7 hours to demolish existing bridge and slide in new bridge
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Both Bridge Slides Completed 10 Months After NTP
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Time Lapse
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ABC Rehab Projects
• PBES• SPMT
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Minneapolis Franklin Avenue Bridge Rehabilitation
New deck, cap beams and columns using precast members
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Minneapolis Franklin Avenue Bridge Rehabilitation
• Part-width construction is not cost-effective
• Cast-in-Place Construction: Requires full closure for two years
• ABC alternate: Full closure for 3 months• Adjacent to Univ. of Minnesota campus• Closure can be timed to occur in summer months• On-site pre-casting by contractor
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On Site Pre-casting --- Franklin Ave. Bridge MN
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Steam Curing / Wet Curing of Slab Panels
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PennDOT State Route 30 Bridge – Weekend Replacement Replacement • 54 Hour closure (Friday night – Monday Morning)
• Busy State Route (ADT 30,000) over local road in East Pittsburgh, PA• Full superstructure and partial substructure replacement
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Partial Demolition of Abutments / New Preacst Caps
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Steel Superstructure Modules -- Assembly
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Bridge Model
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Weekend Superstructure Replacement Using SPMTsBridge Over Route 9 ; Massachusetts
Substructure Rehab
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STAGING AREA
ROUTE 9
Bridge Over Route 9; Site-Layout
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Substructure Rehabilitation with Precast Caps
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New Two-span Steel Superstructure on False-work
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SPMT Move
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New Superstructure on Rehabilitated Substructure
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NJ Transit Bridge Replacement – Plainfield, NJ• Weekend Superstructure Replacement with SPMT– October 2015• Rehab Substructure
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Substructure Rehab -- Saturday
New bridge assembled in station parking lot
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Bridge Move – Saturday Night
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Track Work -Sunday
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Thank You