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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
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
Slope StakesSlope Stakes
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 33
Grade Stakes (Blue Grade Stakes (Blue Tops)Tops)
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 44
Natural GroundNatural Ground
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 55
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
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 77
3D Rough Grading3D 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 88
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
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 99
2D Operator View2D Operator View
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 1010
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?
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 1111
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
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 1212
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
Session 404 - Page Session 404 - Page 1313
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
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
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 1515
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
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 1717
What happens between stations?
SurveyingSurveying
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 1818
“thought I was wrong once but I was mistaken”
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
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 1919
3D Model3D Model
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 2020
3D Operator View3D Operator View
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 2121
3D Plan View3D Plan View
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 2222
3D Cross Section View3D Cross Section View
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 2323
3D Best Practices3D Best Practices
Control - StandardControl - Standard Control – Use itControl – Use it Control - MaintainControl - Maintain
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 2424
3D GPS Grading3D GPS Grading
Fully automated vertical controlFully automated vertical control Cross slope changes automatedCross slope changes automated Grade “anywhere”Grade “anywhere”
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 2525
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
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 2626
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
3D Robotic Grading3D Robotic Grading
Highly accurate, robotic locationHighly accurate, robotic location
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 2828
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
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 2929
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!
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…
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 3131
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
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 3232