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Trail Bridges – Details for Longevity, Condition Assessments and Annual Maintenance. Presenter: James “Scott” Groenier, P.E. Project Leader, MTDC, WIT Prepared for: NOHVCC Conference Ontario, CA March 17, 2005. Introduction. Construction

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Trail Bridges – Details for Longevity, Condition Assessments and Annual Maintenance

Presenter:

James “Scott” Groenier, P.E.

Project Leader, MTDC, WIT

Prepared for: NOHVCC Conference

Ontario, CA

March 17, 2005


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Introduction

  • Construction

    - Details For Longevity

  • Condition Assessments

  • Annual Maintenance

  • Summary


Construction l.jpg
Construction

  • Details for Longevity

    • Durability and Design details by Kropf

      Available from WIT on CD “The National Wood in Transportation Program”

    • Controlling Decay in Waterfront Structures by Highly & Scheffer http://www.fpl.fs.fed.us/documnts/fplrp/fplrp494.pdf


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Construction

  • Details for Longevity

    • Shedding water off Structures

      • Beveled Top Rails

      • Raised Low Rails


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Construction

  • Details for Longevity

    • Shedding water off Structures

      • Scupper blocks for Curbs


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Construction

  • Details for Longevity

    • Structure Protection

      • Side Rails

      • Wearing Surface


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Construction

  • Details for Longevity

    • Shedding water off Structures

      • Bridge Gradients


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Construction

  • Details for Longevity

    • Approach Ditches

    • Cross Drains


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Construction

  • Details for Longevity

    • Earth-Wood Interface

    • Screwing vs. Nailing


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Construction

  • Weathering Steel Corrosion Problems

    • Technical Advisory – T5140.22http://www.fhwa.dot.gov/legsregs/directives/techadvs/t514022.htm

    • Environment

      • Marine Coastal Areas

      • Frequent High rains, High Humidity or Persistent fog

    • Locations to avoid

      • Tunnel Like Conditions

      • Low Water Crossings

        • 10 feet – over stagnant water

        • 8 feet – over moving water


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Construction

  • Corrosion problems with new wood treatments

    http://www.strongtie.com/productuse/corrosion.html

  • Conclusion from Technical Bulletin

    • Certain treatments are more corrosive than CCA.

    • Treated wood industry recommends use of Stainless Steel or Hot-dip Galvanized fasteners and connectors.

    • Check to make sure fasteners, connectors and wood treatment type are compatible.


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Condition Assessment

  • Timber Bridges – Maintenance, Rehabilitation and Replacement by Muchmore

    • Website for free publications: http://spfnic.fs.fed.us/wit/WITpubs/PubSearch.cfm

  • Bridge Inspection / Assessment

    • FS requires every 4 years

    • Trail Bridge Matrix


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Condition Assessment

  • Bridge Assessment Forms



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Condition Assessment

  • Stream Bank Scour


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Condition Assessment

  • Foundation and Substructure


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Condition Assessment

  • Stringers and Beams


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Condition Assessment

  • Decking and Wearing Surface


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Condition Assessment

  • Railing and Curbing


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Annual Maintenance

  • Cleaning Decks


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Annual Maintenance

  • Cleaning Tops of Sills


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Annual Maintenance

  • Bridge Approaches


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Annual Maintenance

  • Other Items

    • Cleaning Tops of Beams

    • Clearing Brush

    • Nailing and Replacing Decking

    • Repairing banks


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Summary

  • Construction

    - Details For Longevity

  • Condition Assessments

  • Annual Maintenance

  • Questions?


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