Details for Longevity by 3w4Hx51J

VIEWS: 0 PAGES: 24

									                                    Technology & Development




        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
                             Technology & Development




Introduction
  Construction
   - Details For Longevity
  Condition Assessments
  Annual Maintenance
  Summary




                                              2
                                                                 Technology & Development




 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




                                                                                  3
 Construction
                                    Technology & Development




 Details for Longevity
   Shedding water off Structures
      Beveled Top Rails
      Raised Low Rails




                                                     4
                                    Technology & Development




Construction
 Details for Longevity
   Shedding water off Structures
      Scupper blocks for Curbs




                                                     5
Construction
                           Technology & Development




 Details for Longevity
   Structure Protection
      Side Rails
      Wearing Surface




                                            6
                                    Technology & Development




Construction
 Details for Longevity
   Shedding water off Structures
      Bridge Gradients




                                                     7
                          Technology & Development




Construction
 Details for Longevity
   Approach Ditches
   Cross Drains




                                           8
                            Technology & Development




Construction

  Details for Longevity
    Earth-Wood Interface
    Screwing vs. Nailing




                                             9
                                                                Technology & Development




Construction
 Weathering Steel Corrosion Problems
   Technical Advisory – T5140.22
    http://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


                                                                               10
                                                Technology & Development




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.


                                                               11
                                                                             Technology & Development




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




                                                                                            12
                             Technology & Development




Condition Assessment
  Bridge Assessment Forms




                                            13
Condition Assessment
                       Technology & Development




                                      14
                       Technology & Development




Condition Assessment
 •Stream Bank Scour




                                      15
                               Technology & Development




   Condition Assessment
•Foundation and Substructure




                                              16
                       Technology & Development




   Condition Assessment
•Stringers and Beams




                                      17
                               Technology & Development




Condition Assessment
•Decking and Wearing Surface




                                              18
   Condition Assessment
                       Technology & Development




•Railing and Curbing




                                      19
    Annual Maintenance
                     Technology & Development




 Cleaning Decks




                                    20
    Annual Maintenance
                           Technology & Development




 Cleaning Tops of Sills




                                          21
                      Technology & Development



     Annual Maintenance
 Bridge Approaches




                                     22
      Annual Maintenance
                                      Technology & Development




 Other Items
     Cleaning Tops of Beams
     Clearing Brush
     Nailing and Replacing Decking
     Repairing banks




                                                     23
                            Technology & Development




Summary
 Construction
  - Details For Longevity
 Condition Assessments
 Annual Maintenance
 Questions?




                                           24

								
To top