Download - Spring 2013 Section Engineers Conference March 5, 2013 Guardrail Items Terry Chism, Div of Const
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Spring 2013 Section Engineers
ConferenceMarch 5, 2013
Guardrail ItemsTerry Chism, Div of Const.
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Yes, there are & will be more changes and clarification for
Guardrail Many of the changes being made
now are the results of the comments received from the Field during the Guardrail Installation Training.
You made the difference with your concerns and comments – YOU DID GOOD!!!
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Guardrail Mounting Height Important -What is
Maintenance to do on Damaged Guardrail??
27” Guardrail that is damaged will be replaced to a minimum height of 27”
If existing NCHRP 350/MASH Approved Guardrail End Treatments are damaged they may be repaired – if destroyed - then replace with current KY Approved NCHRP 350/MASH End Treatments
If non-NCHRP 350/MASH Guardrail End Treatments are damaged they must to be replaced with current NCHRP 350/MASH End Treatments
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Proprietary Guardrail End Treatments will remain at
27” Mounting Height KY will continue using NCHRP 350 Approved 27”
Guardrail End Treatments until 29” End Treatments are Tested and Approved
TRANSITION: Utilize the last 2 sections of 12’ 6” Guardrail (25’) prior to the Pay Limits of the End Treatment to Transition from the 29”Guardrail Mounting Height to the 27” End Treatment --- ie do not change the mounting height within the pay limits of the end treatment
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Mounting Height for Type 2A and Type 3 End Treatments
is 29” +/- 1” WHY?? These End Treatments are Built with
Generic Materials – they are not Proprietary Beginning with the June 2012 Letting Sect 719.03 KY 2012 Standard Specifications
has been changed to read “Construct guardrail 29 inches to the top of the rail, with a tolerance of plus or minus one inch above the theoretical pavement elevation” (shoulder slope extended)
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Std Draw BHS-008 Rail System Type 3: Replaced by
Sepia #0066-15-2012 - Changed
dimension
1’ 9” dimension Changed to 1’ 11”
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Std Draw RBR-025-05 Guardrail End Treatment Type 2A
Replaced by Sepia #07 6-15-12 – Added Details
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Std Draw RBR-005-10 Guardrail Components Replaced by Sepia #008 6-15-2012 Removed Cable
Detail
Cable DetailRemoved
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Std Draw RBE-100-09 Crash Cushion Type VI-BT & CT Replaced
by Sepia #009 8-24-2012
Note:A Class CT (reusable or self restoring) can beUsed at the Contractors Discretion
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Std Draw RBR-001-11 Steel Beam Guardrail (W Beam)
Replaced by Sepia #012 12-11-2012
RemovedRequirement& Detail forBack-up Plate –PermanentChangePermits the
use of both 12’ 6”& 25’ GuardrailSections May & June Lettings
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Sepia #12 Replaces RBR-001
NO Backup Plates NeededAllows 12’6” & 25’ Rail
Sections
RBR-001
Sepia #012
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Low Fill Culverts with Guardrail Spans up to 25’
Without Post – What do we do??
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For Low Fill Culverts 25’ OpeningUse RBR-031 Guardrail End
Treatment Type 3 Pipe Drainage
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16
Type 7 End Treatment
50 Foot (2 break away post) Turndown end treatment attached to concrete anchor block (MUST HAVE). Flared 0’ to 4’ (desirable) from the normal guardrail line
Note 3 Std Draw RBR-050 “This guardrail end treatment is not for use on approach end on high speed NHS.”
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Critical!!!Type 7 Concrete Anchor
1. The concrete anchor block maybe precast or cast-in-place. When the anchor is cast-in-place forming of the sides shall be required.
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Bill Gulick say’s Type 7 Alternate End Treatment
OK
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Bill Gulick say’s Type 7 Alternate End Treatment
OK
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Do NOT Use this Drawing with the Title Block with
Manufacture on it
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Use this Drawing with the Title Block without Manufacture on it
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Deflections Bridge Pier NOT Considered – Cap
within 2’Heavy Coal Haul Route
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New York City Bus CrashHigh Center Gravity
VehicleNormal Guardrail to Close
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Design, Construction & Maintenance be Aware!!!
Just because a Guardrail End Treatment is in place or in a set of plans it doesn’t make it right!!!!: It may NOT be at the proper location It may not be the best end treatment for that
location Design & Consultants need to check in
the field – so often 3R/4R plans place new treatments at the old/current location (may be 30 years old & incorrect)
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Design, Construction & Maintenance be Aware!!!
Maintenance & Safety Projects need to be checked in the field for proper End Treatment Type and Location
Construction can/should make changes whenever they note an end treatment in the plans that does not look correct
When a Guardrail End Treatment is damaged and needs replaced, a field determination should be made as to proper Type and Location
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Old BCT Replaced with Type 1 @ same Location – NOT long Enough to Shield
hazard
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Minimum Length of Guardrail - including End Treatment – before a Fixed Object – 200
FeetTypical Guardrail Installations: Std Draw RBI-001, 002,Std Draw RBI-004 Type 1Std Draw RBI-005 Bridge ColumnStd Draw RBI-006 Sign Support
ALL CONTAIN THE FOLLOWING NOTE:
ALL CONTAIN THE FOLLOWING NOTE:
Std Draw RBB-001 & 002Guardrail & Bridge End
Std Draw RBB-010 Guardrail Transition From Normal ShdTo Narrow Bridge
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Per Bill Gulick
“You CANNOT Disconnect(or separate)
Grading and Guardrail”
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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
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Extruder Head should be Parallel to the
Guardrail/Ground – Not dipping down like these
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Extruder Heads shall be Parallel to the
Guardrail/Ground – Not dipping down like this
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Improper Installation - Extruder Head not Pushed all the way on
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Problems with Older ET’s with Wood Post
Lag Screws stripped and fall out – either replace Post or Rotate Old Post 180 Degrees and install new Lag screws (Pilot Holes)
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By Change Order – any/all of the following may be
changed on Pre June 2012 Projects
Guardrail Mounting Height 27” to 29” Change old stiff Type 2A End Treatment
to newer, softer Type 2A – Sepia 007 (no concrete required)
Guardrail Post in Rock can be changed to the new method of installation (no concrete required)
Delete backup plates Can be combined in one Change Order
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Questions or Problems with new Guardrail
Specifications or Standard Drawings
Give me a call and we can discuss to help determine what changes or clarifications need to be made
502-564-4780 [email protected] I will work with Jeff Lail, Bill Gulick, Nasby
Stroop, Rachel Mills etc. to Correct I work Part Time so keep trying to get me
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Yes, there are & will be more changes and clarification for
Guardrail Many of the changes being made
now are the results of the comments received from the Field during the Guardrail Installation Training.
You made the difference with your concerns and comments – YOU DID GOOD!!!
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Closing Thank you for your attention Hope you have found this
presentation and the Guardrail Installation Training to be Useful and Informative
More Classes in March Questions??
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2012 Standard Specification Section 719.03Guardrail:
New Requirement “Prior to ordering guardrail materials the Engineer
and the Contractor shall meet on the job site to check the guardrail end treatments locations designated in the plans against actual field conditions to determine if the locations and end treatment types are appropriate. Adjustments will be made as appropriate and final location and end treatment types will be approved by the engineer. If considered necessary, the Engineer will consult with the Division of Design.”
Comments, performed any, useful, made changes??