Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009 AFB80 Session 404 January 12, 2009...
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Transcript of Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009 AFB80 Session 404 January 12, 2009...
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Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009
AFB80 Session 404AFB80 Session 404January 12, 2009January 12, 2009
Contractor Best PracticesContractor Best Practices
Transportation Research Board
11
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H. B. Rowe & Co., Inc.H. B. Rowe & Co., Inc.
Founded in 1946Founded in 1946 Heavy Highway / Site Heavy Highway / Site
DevelopmentDevelopment Licensed in North Carolina, Licensed in North Carolina,
South Carolina, and VirginiaSouth Carolina, and Virginia
Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009 Session 404 - Page Session 404 - Page 22
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Slope StakesSlope Stakes
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Grade Stakes (Blue Grade Stakes (Blue Tops)Tops)
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Natural GroundNatural Ground
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2-D Rough Grading2-D Rough Grading
Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009 Session 404 - Page Session 404 - Page 66
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2-D Rough Grading2-D Rough Grading
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3D Rough Grading3D Rough Grading
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Bubba’s Rule of Bubba’s Rule of PrecisionPrecision
Measure it with a micrometerMeasure it with a micrometer
Mark it with chalkMark it with chalk
Cut it with an axeCut it with an axe
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2D Operator View2D Operator View
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2-D Manual Grading2-D Manual Grading
Manual control of machineManual control of machine Quality – skill of operator and checkerQuality – skill of operator and checker Grade along profile between stations?Grade along profile between stations?
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Manual Best PracticesManual Best Practices
Guard stakes adjacent to grade hubsGuard stakes adjacent to grade hubs
Notch or Nail grade and correctionNotch or Nail grade and correction
Visually mark super-elevation Visually mark super-elevation changeschanges
Stay one station ahead of graderStay one station ahead of grader
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String SagString Sag
Can easily “check” out of toleranceCan easily “check” out of tolerance Lower and inconsistent string pullLower and inconsistent string pull Length on multi-lane can exceed 70 ftLength on multi-lane can exceed 70 ft SAG 0.19 ft - Pull 20 lb, String 0.1oz/ftSAG 0.19 ft - Pull 20 lb, String 0.1oz/ft
Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009
crown
Maximum SAG
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Quality AssuranceQuality Assurance
Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009 Session 404 - Page Session 404 - Page 1414
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2.5D Sonic Grading2.5D Sonic Grading
Partial vertical automationPartial vertical automation Changes in super-elevation - manualChanges in super-elevation - manual Grade along profile maintainedGrade along profile maintained
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Sonic Best PracticesSonic Best Practices
Steel pins set at Grade Hubs, add 1 Steel pins set at Grade Hubs, add 1 ftft
String runs 1,000 feet or lessString runs 1,000 feet or less Visually indicate super changesVisually indicate super changes Complete first pass on stringComplete first pass on string Calibrate – Cutting edge & tire Calibrate – Cutting edge & tire
changechange Paint crown and shoulder breaksPaint crown and shoulder breaks
Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009 Session 404 - Page Session 404 - Page 1616
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Quality AssuranceQuality Assurance
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What happens between stations?
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SurveyingSurveying
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“thought I was wrong once but I was mistaken”
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3D vs Grade Stakes3D vs Grade Stakes
Assume a interstate project 8.3 kmAssume a interstate project 8.3 km Grade Stakes every 20 m (4 per Grade Stakes every 20 m (4 per
station) VS Control Stakes every station) VS Control Stakes every 320 m320 m
1660 Grade Stakes VS 26 Control 1660 Grade Stakes VS 26 Control StakesStakes
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3D Model3D Model
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3D Operator View3D Operator View
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3D Plan View3D Plan View
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3D Cross Section View3D Cross Section View
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3D Best Practices3D Best Practices
Control - StandardControl - Standard Control – Use itControl – Use it Control - MaintainControl - Maintain
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3D GPS Grading3D GPS Grading
Fully automated vertical controlFully automated vertical control Cross slope changes automatedCross slope changes automated Grade “anywhere”Grade “anywhere”
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GPS Best PracticesGPS Best Practices
Fixed base station locationFixed base station location Site Calibration - CONTROLSite Calibration - CONTROL Check consistency dailyCheck consistency daily Awareness of paper plansAwareness of paper plans
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Quality AssuranceQuality Assurance
Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009 Session 404 - Page Session 404 - Page 2727
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3D Robotic Grading3D Robotic Grading
Highly accurate, robotic locationHighly accurate, robotic location
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Robotic Best PracticesRobotic Best Practices
Grade Control every 1,000 ftGrade Control every 1,000 ft Establish error limits for set-upEstablish error limits for set-up Always measure/update blade Always measure/update blade
wearwear Don’t pretend to be a surveyorDon’t pretend to be a surveyor Level the mast when benchingLevel the mast when benching
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Quality AssuranceQuality Assurance
Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009Contractor Best Practices – H. B. Rowe & Co., Inc. Jan 2009 Session 404 - Page Session 404 - Page 3030
Need a more advanced string!
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Bubba’s Rule ReversedBubba’s Rule Reversed
Cut it with a laserCut it with a laser
Mark it with your Mark it with your thumbthumb
Measure it with a Measure it with a string Forget about string Forget about sag, just cut out the sag, just cut out the crown…crown…
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ConclusionConclusion
Technology enables quality and Technology enables quality and speedspeed
Best Practices key to higher Best Practices key to higher qualityquality
Quality Assurance slow to adoptQuality Assurance slow to adopt
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