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NCDOT/ AGC Workshop Roadway Breakout Vickie Davis, PE 2 U-2579B - - PowerPoint PPT Presentation
NCDOT/ AGC Workshop Roadway Breakout Vickie Davis, PE 2 U-2579B - - PowerPoint PPT Presentation
NCDOT/ AGC Workshop Roadway Breakout Vickie Davis, PE 2 U-2579B Winston-Salem Northern Beltway 3 Existing Snowplowable Markers 4 5 Construction Surveying Conduct survey preconstruction meeting to discuss control and required
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U-2579B Winston-Salem Northern Beltway
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Existing Snowplowable Markers
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Construction Surveying
➢ Conduct survey preconstruction meeting to
discuss control and required submittals ➢ Will Contractor use Automated Machine Guidance? Submit AMG plan ➢ NCDOT Standard Specifications Section 801 ➢ Manual for Construction Layout TO BE REVISED 2018
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Manual for Construction Layout
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Digital Terrain Models ➢ If the Contractor elects to use Automated Machine
Guidance, a Digital Terrain Model (DTM) shall be developed and submitted to the Engineer for review ➢ RE should consult with Division Locating Engineer who can assist with review of DTM ➢ RE offices will receive Trimble Business Center software; Location & Surveys Unit providing training
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Guardrail Installation
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GUARDRAIL INSTALLATION- MASH 2016
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HOW IS GUARDRAIL APPROVED??
Guardrail Installation
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➢ Guardrail and terminals are crash tested in laboratory settings ➢ FHWA and AASHTO joint task force evaluated how terminals performed in real-world conditions using actual crash data
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Based on their findings…
Guardrail Installation
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Manual for Assessing Safety Hardware (MASH)
✓ AASHTO’s Manual for Assessing Safety Hardware was published in 2009 ✓ Updated guidelines for crash testing permanent and temporary highway safety features including guardrail terminals
http://safety.fhwa.dot.gov/roadway_dept/policy_guide/road_hardware/ctrmeasures/mash/
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History of Testing Procedures
➢ Procedures for crash testing have evolved
Guardrail Installation
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Highway Research Correlation Services Circular 482 1962 NCHRP Report 153 1974 NCHRP Report 230 1980 NCHRP Report 350 1993
AASHTO MASH is the newest and safest generation
- f roadside hardware.... Approved by FHWA in 2015
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Guardrail Installation
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Manual for Assessing Safety Hardware (MASH)
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Guardrail Installation
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Guardrail Installation
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Supplemental Agreements
(Projects Let prior to January 2018)
Guardrail Installation
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Guardrail Installation
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Rdwy Standard Drawing 862.01
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Guardrail Installation
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B-77 STRUCTURE ANCHOR UNIT
Guardrail Installation
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B-83 STRUCTURE ANCHOR UNIT
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Transition in Guardrail Height …
Guardrail Installation
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Guardrail Installation
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Type III Guardrail Anchor Units
Guardrail Installation
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Type III Guardrail Anchor Units
Guardrail Installation
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X
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Type III Guardrail Anchor Units
Guardrail Installation
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Due to error in RSD 862.03 look for this detail in plans 1’-9” to center
- f end shoe
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Guardrail End Units- MASH
Guardrail Installation
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FOR POSTED SPEEDS ≥ 45 MPH USE GREU TYPE TL-3 FOR POSTED SPEEDS < 45 MPH USE GREU TYPE TL-2
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NCDOT Vendor Approved Products List
Guardrail Installation
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➢ Currently only 3 MASH approved Guardrail End Units
➢ NO Flared End MASH approved End Units at this time
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Guardrail Installation
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MSKT (Road Systems) Soft Stop (Trinity) Max Tension (Lindsay)
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Project Special Provisions
Guardrail Installation
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Assembling Instructions
Guardrail Installation
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https://connect.ncdot.gov/resources/ Specifications/Pages/2018-Roadway- Standard-Drawings.aspx