Design options Overview of recent projects Specific project details Performance tested in Lab AITs services How can we work with you Composite Arch BridgeinaBackpack System ID: 660043
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OutlineWhat & How? Design optionsOverview of recent projectsSpecific project detailsPerformance tested in LabAIT’s services “ How can we work with you? ”
Composite Arch “Bridge-in-a-Backpack” SystemSlide2
What is the “ Bridge-in-a-Backpack ” SystemImage Credit – NY Times/University of Maine“ A Hybrid bridge system combining benefits of high-performance composites with durability and cost savings of cast-in-place concrete”
Carbon Fiber Composite + Concrete Arch SuperstructureSlide3
Projects Completed & Underway
Status
Bridge Location/Name
Description
Const.
Year
Key Stats
Complete
(7)
Pittsfield, ME – Neal Bridge
Pilot
Project with University of Maine
2008
29.0’ Span
23 Arches
Anson, ME – McGee Bridge
Municipal Design/Build Project
2009
28.0’ Span
9 Arches
Bradley,
ME – Jenkins Bridge
Maine Composite Bridge Initiative
2010
28.5’ Span
14 Arches
Auburn, ME – Jenkins BridgeMaine Composite Bridge Initiative201038.0’ Span13 ArchesBelfast, ME – Perkins BridgeMaine Composite Bridge Initiative201048.0’ Span16 ArchesHermon, ME – Tom Frost Memorial BridgeSnowmobile/Pedestrian Bridge201044.5’ Span3 ArchesFitchburg, MAMA DOT Accelerated Bridge Program201137.5’ Span15 ArchesUnder Construction(2)Caribou, ME – Farm Access OverpassMaine Composite Bridge Initiative201154.0’ Span22 ArchesPinkham’s Grant, NHState Bridge Program201124.5’ Span6 ArchesDesign &ProposalBridges in design in ME, MI, proposals submitted in 11 states
Bradley
Belfast
Fitchburg
CaribouSlide4
Design Options - HeadwallsFRP Panel WallsMSE or Through-Tied ConfigurationsCompatible with skewed bridgesLightweight, easy to installDurable, and cost competitiveConcrete – Precast or CIPMSE, Through-Tied, or GravityPC Panel, PCMG Units, Cast-in-place
Versatile design optionsMore conventional aesthetic
Multiple options to meet the Engineering, Economic, and Aesthetic requirements of the siteSlide5
Headwall Options for Test-Level 4 DesignWall-mounted BarriersPrecast or CIP Gravity WallPrecast Panel MSE WallsSlide6
McGee Bridge Replacement Example – 28’ Span
CONSTRUCTION SEQUENCE
Demo. existing steel bridge
Excavate for footings
Drill bedrock, form footings
Arch installation
Pour concrete footings
Install composite decking
Fill arches with concrete
Erect composite headwalls
Pour deck concrete
Backfill bridge, install
geogrid
Finish grading
Guardrails and cleanup
12 Days Total Construction Time
Low Bid Against Steel, Concrete, WoodSlide7
A note on footingsPerkins Bridge, Belfast, MERoyal River Bridge, Auburn, ME
Steel H-pilesSpread FootingsSlide8
Key MetricsSpan – 54’-2”Rise – 12’-0½”Rise/Span – 22%Skew – 30 deg22 – 15” Diameter Arches
Arch weight ~300lb eachPrecast Concrete MSE Headwalls/Wingwalls
Caribou Connector BridgeSlide9
Caribou Connector BridgeSlide10
Caribou Connector BridgeSlide11
How we got here- “Bridges to the future, now” FHWA’s Public Interest Finding:
Allows for federal funding on projects where aspects deviate from typical requirements, when in the interest of the public. i.e. in cases of “Cost-Effectiveness or System Integrity…” [FHWA]Simple application process – approval from FHWA in as little as 2 days
Maine’s Composites Initiative
Six bridges in two years
Variety of bridges to best gage how system fit’s into Maine’s bridge inventory
28-55’ spans
Stream/road crossing
F
oundation types
Headwall designs
[FHWA Contract Administration Core Curriculum Manual, Section 3.C,
http://www.fhwa.dot.gov/construction/cqit/findings.cfm]
Also being used in:
Massachusetts
New Hampshire
Michigan
Proposals in 11 states & 3 countries outside the US
Design-Build - Detail-Build - Value EngineeringSlide12
Performance Testing: Arch TestingHL-93 Design Load Equivalent Slide13
National Recognition for Bridge-in-a-BackpackEngineering Excellence Award Royal River Bridge, Auburn, ME(Along with Maine DOT & Kleinfelder |SEA)
AASHTO TIG - 2011 Focus Technology
Product
featured
in:
Engineering News Record,
The NY Times,
Concrete
International,
Popular Science,
Popular Mechanics,
The Boston
Globe
American Society of Civil Engineers
2011 Charles
Pankow
Award for Innovation
2010 Award for Composites Excellence
Most Creative ApplicationSlide14
Summary and Quick Facts on CFFT Arch BridgesInnovative Product Application
Rapid fabrication our facility or option to fabricate at/near jobsite
Hybrid composite-concrete system improves material performance
Steel free superstructure
Reduced carbon footprint
Performance Tested
Design/tested to exceed AASHTO load requirements
Superior redundancy – safe system
Corrosion resistant materials
Field load testing indicates even greater levels of safety
Cost Effective and Fast Installation
Light weight product– reduces equipment transportation needs
Erected with a small crew, no skilled labor
Performs up to 2x lifespan of conventional materials
Accelerated Bridge Construction
Rapid design, fabrication, and deliverySlide15
What can AIT do for you?Structural DesignAIT’s engineers design the composite arch bridge superstructureAIT can design the bridge substructure, internally or with consultantsOptimization to maximize efficiency of structureSupplyAIT supplies a complete engineered bridge system
Packages: arches/decking, modular FRP headwallsInstallation Oversight
Daniel
Bannon
Structural Engineer
Jonathan
Kenerson
Manufacturing Manager