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Session 3 Grading Requirements for Guardrail End Treatments

Session 3 Grading Requirements for Guardrail End Treatments. Recoverable Slope 4:1 or Flatter. Traversable Slope 3:1 to 4:1. Non-Traversable Critical Slope Steeper than 3:1. Three Areas to Consider for Grading. Advanced Grading Adjacent Grading Run Out Grading. Per Bill Gulick.

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Session 3 Grading Requirements for Guardrail End Treatments

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  1. Session 3Grading Requirements for Guardrail End Treatments

  2. Recoverable Slope 4:1 or Flatter

  3. Traversable Slope3:1 to 4:1

  4. Non-Traversable Critical SlopeSteeper than 3:1

  5. Three Areas to Consider for Grading • Advanced Grading • Adjacent Grading • Run Out Grading

  6. Per Bill Gulick “You CANNOT Disconnect Grading and Guardrail”

  7. Advanced grading 10:1 on Top of PadSide Slope 4:1 or Flatter

  8. Advanced Grading if not properly done can cause a Rollover or Vehicle may not hit End Treatment Properly

  9. Adjacent Grading 10:1 on Top of Pad – 5’ WideSide Slope 4:1 Desirable 3:1 Max

  10. Adjacent grading if not properly done can cause a rollover

  11. Run Out Grading 4:1 Desirable3:1 Max

  12. Run out grading if not properly done can cause a rollover or a collision with a fixed object

  13. KY Example - Good Grading, Guardrail Installed for Box CulvertBut Pre Pass Box & Pole Only 95’

  14. Grading Requirements Standard Drawing RBI-004Installation of Guardrail End Treatment Type 1 2012 Std Draw shows 5’ of widening in the “Adjacent” area behind the guardrail

  15. Grading Type 4A End Treatment

  16. Grading Requirements Pads & SlopesGetting Good Pads but Poor Slopes beside PadsGuardrail End Treatments Type 1 & 4A’s 2012 Std Draw shows 5’ of widening in the “Adjacent” area behind the guardrail – Sect A-A Side slopes 4:1 Desirable 3:1 Max

  17. Minimum Length of Guardrail - including End Treatment – before a Fixed Object – 200 Feet Typical Guardrail Installations: Std Draw RBI-001, 002, Std Draw RBI-004 Type 1 Std Draw RBI-005 Bridge Column Std Draw RBI-006 Sign Support ALL CONTAIN THE FOLLOWING NOTE: ALL CONTAIN THE FOLLOWING NOTE: Std Draw RBB-001 & 002 Guardrail & Bridge End Std Draw RBB-010 Guardrail Transition From Normal Shd To Narrow Bridge

  18. Q & A Time 1. What are the Names for the 3 Areas of Grading? Advanced, Adjacent and Run Out

  19. Q & A Time 2. Why do we need to grade an area in front of an End Treatment so Flat? to ensure that a vehicle is stable at the moment of impact and that its suspension is neither extended nor compressed

  20. Q & A Time • Define: Recoverable Slope Traversable Slope Critical Slope • Recoverable Slope – 4:1 or Flatter • Traversable Slope – 4:1 to 3:1 • Critical Slope - Steeper than 3:1

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