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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

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
Introduction
  • Construction

- Details For Longevity

  • Condition Assessments
  • Annual Maintenance
  • Summary
construction
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
construction4
Construction
  • Details for Longevity
    • Shedding water off Structures
      • Beveled Top Rails
      • Raised Low Rails
construction5
Construction
  • Details for Longevity
    • Shedding water off Structures
      • Scupper blocks for Curbs
slide6

Construction

  • Details for Longevity
    • Structure Protection
      • Side Rails
      • Wearing Surface
construction7
Construction
  • Details for Longevity
    • Shedding water off Structures
      • Bridge Gradients
construction8
Construction
  • Details for Longevity
    • Approach Ditches
    • Cross Drains
construction9
Construction
  • Details for Longevity
    • Earth-Wood Interface
    • Screwing vs. Nailing
construction10
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
construction11
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.
condition assessment
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
condition assessment13
Condition Assessment
  • Bridge Assessment Forms
condition assessment15
Condition Assessment
  • Stream Bank Scour
condition assessment16
Condition Assessment
  • Foundation and Substructure
condition assessment17
Condition Assessment
  • Stringers and Beams
condition assessment18
Condition Assessment
  • Decking and Wearing Surface
condition assessment19
Condition Assessment
  • Railing and Curbing
annual maintenance
Annual Maintenance
  • Cleaning Decks
annual maintenance21
Annual Maintenance
  • Cleaning Tops of Sills
annual maintenance22
Annual Maintenance
  • Bridge Approaches
annual maintenance23
Annual Maintenance
  • Other Items
    • Cleaning Tops of Beams
    • Clearing Brush
    • Nailing and Replacing Decking
    • Repairing banks
summary
Summary
  • Construction

- Details For Longevity

  • Condition Assessments
  • Annual Maintenance
  • Questions?
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