Temporary Crash Cushions - PowerPoint PPT Presentation

temporary crash cushions n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Temporary Crash Cushions PowerPoint Presentation
Download Presentation
Temporary Crash Cushions

play fullscreen
1 / 45
Temporary Crash Cushions
620 Views
Download Presentation
thane
Download Presentation

Temporary Crash Cushions

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. FDOT Contacts: District One Construction Marshall Douberley 863-519-2382 marshall.douberley @dot.state.fl.us Earl Taylor 863-519-2231 earl.taylor @dot.state.fl.us Temporary Crash Cushions Florida Department of Transportation

  2. Temporary Crash Cushions What is a crash cushion? Crash cushions are protective systems that prevent errant vehicles from impacting obstacles by either smoothly decelerating the vehicle to a stop when it hits head-on or by redirecting the vehicle away from the obstacle in glancing impacts. Two types of crash cushions are used in work zones: stationary and mobile, the latter of which are commonly called truck- or trailer-mounted attenuators (TMAs). Referenced: AASHTO RSDG 2004

  3. Temporary Crash Cushions Crash Cushions • Temporary/Permanent • Attached to rigid barriers • Median Barriers • Roadside Barriers • Bridge Railing • Used in either median or roadside application

  4. Temporary Crash Cushions Test Vehicles NCHRP (National Cooperative Highway Research Program) 350: 820C and 2000P MASH (Manual On Assessing Safety Hardware): 1100C and 2270P Includes Passenger Cars Of All Sizes, Sport/Utility Vehicles, Mini-Vans, Vans and Pick-up Trucks TL-2 tested at 70 km/h (44 mph) TL-3 tested at 100 km/h (62 mph) NCHRP 350 = 820C (1800 lb.) Passenger Car @ 20 deg. MASH = 1100C (2420 lb.) @ 25 deg. NCHRP 350 = 2000P (4400 lb.) Pickup Truck @ 25 deg. MASH = 2270P (5000 lb.) @ 25 deg.

  5. Temporary Crash Cushions What TEST LEVEL is used for a 70 mph facility? FHWA Criteria • Crash Cushions meet NCHRP 350/ MASH - Test Level 3 (TL-3) • Cost Effectiveness • http://safety.fhwa.dot.gov/roadway_dept/policy_guide/road_hardware/qa_bttabr.cfm#btcc2

  6. Temporary Crash Cushions FDOT Criteria • VENDOR DRAWINGS • TL-2 (45 mph or less) • TL-3 (50 mph or greater) • SPEEDS • Interpolating at 5 mph increments • Extrapolating for speeds above 60 mph is no longer allowed

  7. Temporary Crash Cushions FDOT Design Requirements • Station/Offset • Type of Crash Cushion (TL-2 or TL-3) • Speed • Width - Narrow vs. Wide • Length Restrictions • MOT Phase (Temporary)

  8. Temporary Crash Cushions

  9. Temporary Crash Cushions WIDTH Hazard Width

  10. Temporary Crash Cushions LENGTH System Length

  11. Temporary Crash Cushions LENGTH RESTRICTIONS System Length

  12. Temporary Crash Cushions Inertial Redirective

  13. Temporary Crash Cushions Barrier Wall End Anchor Plates Redirective crash cushions are the principle device to shield approach ends of barrier wall

  14. Temporary Crash Cushions Barrier Wall End Anchor Plates Where barrier wall end units are not anchored, 2 and ½ wall units (min.) are required beyond the length of barrier need for wall end anchorage

  15. Temporary Crash Cushions Crash Cushion Attached to Barrier Systems Crash Cushion

  16. Temporary Crash Cushions

  17. Temporary Crash Cushions TAU II

  18. Temporary Crash Cushions TAU II

  19. Temporary Crash Cushions X-TENUATOR

  20. Temporary Crash Cushions Xtenuater

  21. Temporary Crash Cushions

  22. Temporary Crash Cushions QUADGUARD

  23. Temporary Crash Cushions QUADGUARD

  24. Temporary Crash Cushions QUADGUARD ELITE

  25. Temporary Crash Cushions QUADGUARD ELITE

  26. Temporary Crash Cushions QUADGUARD II

  27. Temporary Crash Cushions QUADGUARD II

  28. Temporary Crash Cushions React 350 II

  29. Temporary Crash Cushions React 350 II

  30. Temporary Crash Cushions Quest

  31. Temporary Crash Cushions Quest

  32. Temporary Crash Cushions Heart

  33. Temporary Crash Cushions Heart

  34. Temporary Crash Cushions

  35. Temporary Crash Cushions TRACC

  36. Temporary Crash Cushions TRACC

  37. Temporary Crash Cushions

  38. Temporary Crash Cushions SCI

  39. Temporary Crash Cushions SCI

  40. Truck/Trailer Mounted Attenuators (TMA’S)

  41. Temporary Crash Cushions 41

  42. Temporary Crash Cushions 42 Pay Item

  43. Temporary Crash Cushions 43 Plans :

  44. Temporary Crash Cushions 44 Specifications: 102-9.6 Temporary Crash Cushion: Furnish, install, maintain and subsequently remove temporary crash cushions in accordance with the details and notes shown in the plans, the Design Standards, and requirements of the pre-approved alternatives listed on the QPL. Maintain the crash cushions until their authorized removal. Repair all attachment scars to permanent structures and pavements after crash cushion removal. Make necessary repairs due to defective material, work, or Contractor operations at no cost to the Department. Restore crash cushions damaged by the traveling public within 24 hours after notification as authorized by the Engineer.

  45. Temporary Crash Cushions Questions ????????????????