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Type K Temporary Barriers Revisited by

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Type K Temporary Barriers Revisited by

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    1. Type K Temporary Barriers Revisited by Jon Henri Mayer, P.E. State Construction Structures Engineer Florida Department of Transportation 2007 Construction Conference

    3. State of Florida Highway Construction Worker Fatalities Calendar Year 2002 2003 2004 2005

    4. Type K Temporary Barrier Revisited What is the Type K Barrier? FDOT Structures Design Guidelines Crash Testing of Type K Barrier Deflection Requirement (Allowances) Critical Fabrication and Installation Requirements Transitions and other Designs Damaged / Worn Out Barriers Demonstration Barrier Unit

    5. Type K Temporary Barrier

    6. Type K Temporary Barrier F-Shape Temporary Barrier System Can be used in freestanding, bolted down, staked down and backfilled installations: Available deflection space End anchorage Transitions required Crash tested to the National Cooperative Highway Research Program (NCHRP) Report 350 and new unpublished successor to 350

    7. Safety Shape Barriers

    8. FDOT Structures Design Guidelines Requires temporary traffic barriers for drop-off protection on bridges and retaining walls to have been successfully crash tested to Test Level 3 (minimum) Construction, installation and use of temporary barriers are required to be in accordance with the crash tested designs Requires temporary traffic barriers for drop-off protection on bridges and retaining walls to have been successfully crash tested to Test Level 3 (minimum) Construction, installation and use of temporary barriers are required to be in accordance with the crash tested designsRequires temporary traffic barriers for drop-off protection on bridges and retaining walls to have been successfully crash tested to Test Level 3 (minimum) Construction, installation and use of temporary barriers are required to be in accordance with the crash tested designs

    9. Crash Testing Of Type K Barrier Test Vehicle Ton Pick-up (2WD) Ford, Chevy or Dodge Test Vehicle Weight- 4400 Lbs. Speed- 100 KM/H (62 MPH) Angle- 25 Sustained Damage- Cannot roll over Limited Occupant Compartment Deformation Limitations on sudden impact G Forces Surrogate Test Vehicle represents the 94-96 percentile of all possible vehicle crashes

    10. Type K Temporary Barrier Deflection Requirements (Allowances): Freestanding* - 2' 0" @ ? 45 MPH 4' 0" @ ? 50 MPH Bolted down - 1 " min. Staked down 1' 0" min. Transitions - * Varies see illustrations

    11. Type K Barrier Bolted Down

    12. Type K Barrier Bolted Down Photo Courtesy of Kansas DOT

    13. Type K Barrier Bolted Down Photo Courtesy of MwRSF

    14. Type K Barrier Bolted Down Photo Courtesy of MwRSF

    15. Type K Barrier Bolted Down Photo Courtesy of Kansas DOT

    16. Type K Barrier Staked Down

    17. Type K Barrier Staked Down Photo Courtesy of MwRSF

    18. Type K Barrier Staked Down Photo Courtesy of MwRSF

    19. Type K Barrier - Freestanding

    20. Type K Barrier Median

    21. Critical Fabrication Requirements Fabricator prequalification Rebar placement Connector loop placement (+/- 1/8") Grade of connector loops (ASTM A 706) Conventional rebar or DWWR Concrete strength 5000 psi minimum no structural analysis if less than 5000 psi Marking Plate

    22. Marking Plate

    23. Critical Installation Requirements Barrier units must be in good condition Connector Pins must be in good condition and properly installed Paved surface with 1V:10H or flatter cross slope Clear space behind barrier Transitions Warning lights for delineation

    24. Critical Installation Requirements Correct number and positioning of bolts and stakes One Side Only Pull-out test required for Adhesive Bonded Anchor Bolts Specification Section 416 Type HSHV Adhesive from QPL -Specification Sections 416 and 937 Nuts snug tightened (double nuts)

    25. Critical Installation Requirements Plate Washers top (and bottom) No substitution of other bolt types allowed Complete removal of bolts and stakes Patch bolt holes with Magnesium Ammonium Phosphate Concrete (MAPC) or Epoxy Resin Compound Patch stake holes with asphalt patch material

    26. Transition and Other Designs? Much longer barrier units - 20 and 30 Only crash tested in pinned down or freestanding installations No transitions available Proprietary designs (or similar to) No active crash testing programs for added features New Jersey Shape designs

    27. Offices, Specifications, QPL, Qualified Product List (QPL), Maintenance of Traffic, Temporary Concrete Barrier Walls, Vendor Drawings

    29. Offices, Specifications, QPL, Qualified Product List (QPL), Maintenance of Traffic, Temporary Concrete Barrier Walls, Vendor Drawings

    33. Damaged / Worn Out Barriers Design Standards 414 and 415 require damaged and worn out barrier units to be replaced: Wall units may be reused provided they have the structural integrity and surface qualities of new units. A generous 10 year phase out period beginning October 1, 2002 for continued use of existing stock of non-crash tested temporary barrier is agreed to in the letter Worn out barrier segments are required to be replaced prior to the phase out date Design Standards Index 415 reflects this requirement by stating barrier segments must have the structural integrity of new units in order to be used A generous 10 year phase out period beginning October 1, 2002 for continued use of existing stock of non-crash tested temporary barrier is agreed to in the letter Worn out barrier segments are required to be replaced prior to the phase out date Design Standards Index 415 reflects this requirement by stating barrier segments must have the structural integrity of new units in order to be used

    34. Damaged / Worn Out Barriers

    35. Damaged / Worn Out Barriers

    36. Damaged / Worn Out Barriers

    37. Damaged / Worn Out Barriers

    38. Demonstration Barrier Unit Test Procedure Required By: Design Standard No. 414 Sheet No. 4 of 7 Adhesive Bonding Material Systems

    41. The holes for adhesive bonded anchor bolts for Type K's need to be cleaned thoroughly. Here are photos of a newly drilled hole for the crash test installation.

    42. Note the quantity of dust created that if not completely removed will reduce the pullout capacity of the adhesive bonded anchor bolt:

    45. Where to Get More Information Design Standards are available on the Internet at the Roadway Design Offices website: www.dot.state.fl.us/rddesign

    46. Comments or questions contact: Charles E. Boyd, P.E.

    47. The End !

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