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  • 1Imagination, Good Engineering and Saving MoneyImagination, Good Engineering and Saving Money

    Keith Kirkwood, P.Eng.Peter Buckland, C.M., P.E.

    International Bridge, Tunnel and Turnpike AssociationManaging in an Era of Changing Economic Times2009 April 19-21San Francisco, CA

    Innovative Bearing RetrofitsInnovative Bearing Retrofits

    A. Murray MacKay Bridge Halifax, NS, Canada

    Client: Halifax-Dartmouth Bridge Commission (IBTTA Member)

  • 2Truss Bearing Retrofit at Main Towers

    The Problem: Bearings MalfunctioningThe Challenge: Replace While Minimizing Traffic Disruptions

    Main Tower

    Side Span Truss

    Malfunctioning Bearings

    Main Span Truss

    Truss Bearing Retrofit at Main TowersTruss Bearing Retrofit at Main Towers

    The Solution: Hang Truss From Above on Pendulum Links

    PendulumLinks

    MalfunctioningBearings

  • 3Truss Bearing Retrofit at Main TowersTruss Bearing Retrofit at Main Towers

    The Solution:

    Bridge Deck RehabilitationBridge Deck Rehabilitation

    Saint John Harbour Bridge,Saint John, NB, Canada

    Client: Saint John Harbour Bridge Authority (IBTTA Member)

  • 4Bridge Deck RehabilitationBridge Deck Rehabilitation

    Year 1:

    Traffic Construction

    Running

    Traffic

    Running

    Construction Construction

    NorthApproach

    Ramp B

    Ramp AMain and Side SpansSouth Approach

    Bridge Deck RehabilitationBridge Deck Rehabilitation

    Original Concrete

    Hydro-Demolition

    Cold Milling

    New Asphalt

    NewConcrete

    Original Concrete

    Pass 4 Pass 3

    Pass 1Pass 2

    Existing Deck

    Construction Zone

    New Asphalt

    Existing Deck

    NewConcrete

    End of Year 1

    ConventionalDemolition

  • 5Bridge Deck Widening

    The Problem: Bridge Deck at Capacity(110,000 vehicles/day)

    The Challenge: Make four lanes into five,under modern traffic loads

    And, oh yeah Keep Traffic Running!

    Port Mann Bridge, Vancouver, B.C.

    Bridge Deck WideningBridge Deck Widening

    Original:

    After Widening:

    Approach Spans:

  • 6Bridge Deck WideningBridge Deck Widening

    Work Zone Next to Traffic

    Bridge Deck WideningBridge Deck Widening

    Work Zone Next to Traffic

  • 7Bridge Deck Widening

    Main Span Improvements:

    New Steel Barriers Strengthened Hangers New Maintenance Walkway Falcon Nest Platform Painting of Box Girder

    Survey and Analysis Health Study

    Suspension bridge health can be investigated by survey and analysis technique

    Detective work required to explain differences

  • 8Truss Member Replacement While Traffic Running

    Three Nations Bridge Crossing, Canada - USA

    Client: Seaway International Bridge Corporation (IBTTA Member)

    The Problem: Stiffening truss overloaded by modern traffic

    The Solution: Replace chords with high strength steel

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    Suspension Bridge Full Deck Replacement

    Lions Gate Bridge, Vancouver, BC, Canada

    The Challenge:

    z Replace corroded deck z Widen traffic lanes z Widen sidewalksz Provide barriers z Provide pavingz Provide drainsz Reduce maintenancez Increase load capacity z Improve aerodynamic stabilityz Improve roadway sightlines

    The Constraints:The Constraints:z Maintain same weightz Carry traffic during constructionz Replace each section in 10

    hours 20:00 to 06:00z Very limited access

    The Solution:The Solution:Replacement of Entire Suspended

    Span Structure

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    12 200

    3 SP'S @ 2900 = 8700 13001300

    Original Cross Section

    2000

    2700

    12 192

    16 762

    2000

    27003 LANES @ 3556 = 10 668

    ORNAMENTALLIGHTS

    HANDSTRANDS

    Completed Cross Section

  • 15

    Wind Tunnel Testing

    First Deck Panel Replacement

  • 16

    First Deck Panel Replacement

    Panel Replacement

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    Half-way There!

    A New Driver Experience!

    Original Deck Replacement Deck

  • 18

    Suspension Bridge Strengthening

    Hagwilget Bridge, Terrace, British Columbia

    Suspension Bridge Strengthening

    The Challenge:Increase loading on bridge from 1 x 16 Ton Truck to 2 x 60 Ton Trucks

    The Constraints:Keep vehicle open during except for 10 hours at nightBridge always available for ambulance passage.

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    Suspension Bridge Strengthening

    The Solution:Shorten hangers to deflect deck upwards.

    Summary

    Innovative engineering can save bridge owners money via:

    Decreased capital costs Decreased maintenance costs Minimizing effects on tolls by minimizing disruption to traffic.

  • 20

    Acknowledgements

    Halifax-Dartmouth Bridge CommissionMr. Steve Snider, General Manager and C.E.O.Mr. Jon Eppell, P.Eng., Bridge Engineer

    Saint John Harbour Bridge AuthorityMr. Ken Anthony, General Manager

    Seaway International Bridge CommissionMr. Rik Saaltink, General Manager

    Thank you!

    Presentation OutlinePresentation Outline

    Innovative Bearing Retrofits Bridge Deck Rehabilitation Bridge Deck Widening Suspension Bridge Full Deck Replacement Truss Member Replacement While Traffic Running Suspension Bridge Health Determination

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    10 hours per night, plus always access to hospital

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    Originally, load factor = 1.75R1.75(D+L)

    Now0.9R1.1Df+1.5Dw+1.7L

    For an existing bridge0.9R1.1Df+1.2Dw+1.65L

    Bridge Deck RehabilitationBridge Deck Rehabilitation

    Year 1:

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    Bridge Deck RehabilitationBridge Deck Rehabilitation

    Year 2:

    Bridge Deck RehabilitationBridge Deck Rehabilitation

    Year 2:

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    Bridge Deck RehabilitationBridge Deck Rehabilitation

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