Post on 13-Sep-2020
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Laser Scanner Technique in Road ConditionMonitoring and Problem Diagnostics
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byPekka Maijala and Jani Irvankoski
Roadscanners, Finland
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ROADSCANNERS
TOOLSServices – Software - R&D - Instruments
FOCUSTraffic Infrastructure Condition Management
ROADSCANNERS EXPERTISE:
EM Techniques in NDT Road Surveys
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905 nm8-12 microm0.1 – 1 m
GPR Thermal CameraLaser Scanner
ROAD DOCTOR® ROAD CONDITION SURVEY VEHICLE
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Road Doctor® Laser Scanner Package:
Hardware and Software:1. RD Cam Link (hw+sw)• Digital videos• GPS coordinates• Pavement distress inventory• Drainage inventory (visual)• TRIP-meter (DMI)
2. RD LS package (hw+sw)• 2D laser scanner
3. RD ACC(hw+sw)• 3D Accelerometer
4. RD Designer Software• Data analysis, output and design
1.2.
3.
4.
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Laser Scanner Information
HEIGHT
REMISSION
Cross Section
Point Cloud 3D Model
RUT DEPTHS
Viewing RDLS Data in Road Doctor
Road Area View
PavementSurface View
Benefits of Wide Looking Laser ScannerObjective measured information about:
Rut depts Edge drops Verge heights
Ditch depths Pavement and road width Pavement cross fall
Benefits of Wide Looking Laser ScannerObjective measured information about:
Roughness Bumps, Settlemets
Pavement distress and patches
Warping risks
Dusting problems
Rut Depth Measurement
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Rut leftRut rightMax rutRidge
byWire method,orCutting edge method
Rut Depth Measurement: RDLS Benefits
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Remission data is used for lateralpositioning and results arerepeatable fromrun to run and from year to year !
RUT DEPTH CALIBRATION
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Correlation Between RDLS Maximum Rut Depth Data and Profilometer Data
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Examples of RDLS Diagnostics
Max rut depth (mm) left, right
Max rut depth (mm) left, right
Left lane
Right lane
Left lane
Right lane
Pavement Edge Status Measurements
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Edge drops
Verge heights
Measuring Ditch Depths
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Ditch depths
DITCH CONDITION IS ALSO A PROBLEM ON MAIN ROADS – EXAMPLE OF HW4
Rut depth leftRut depth right
Cross sectionSurface height
IRI
Structure thickness vs. ditch bottom
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EFFECT OF DITCH DEPTH LEVEL VS. ROAD STRUCTURE THICKNESS ON ROAD CONDITION
Road structuresLevel: 0 mLevel: –0,3 m
Level: +0,3 m
1.
2. 3. 4.
4.3.
2.1.
Critical 10%
Ditch bottom level
Measuring Pavement and Road Width
Road paintingPavement edgeRoad shoulder edge
0 m
0 m
0 m
Pavement and road width
Roughness and Cross Fall Surveys:
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Calibration is doneusing rubber plates with
different thickness
3D accelerationsensor(s) can beeasily mounted to survey car back axle
ROUGHNESS FREQUERNCY ANALYSIS
Surface roughness
Bumps
Settlemets etc
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Rovaniemi Street NetworkRoughness 2012 – Eastern City Main Streets
Acceleration 10 m mean (m/s^2)
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Acceleration 10 m average in the picture ~35 m/s^2 Acceleration 10 m average in the picture ~3 m/s^2
Benefits: Acceleration Surveys can be done also on Gravel Roads
Reliable and repeatable road cross fallmeasurements up to 80 km/h
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Ground truth20 km/h40 km/h60 km/h80 km/h
Pavement cross fall
Measuring traffic safety risksrelated to road cross fall:
warping risk
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Integration of Laser Scanner Data with 2D or 3D GPR Data
Integrated Analysis of 2D Laser Scanner, GPR and FWD data
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Analysing Laser Scanner, GPR and FWD Data –Case Korkalovaarantie, Rovaniemi
IRI 2010IRI 2011
Rut 2010Rut 2011
Elevation (m)
Cross section
GPR data
Laser scanner data
Soil replacement2008
We Need to Start to Focus on Repairing the Reasonfor the Road Problems Instead of Fixing the Symptoms
THANK YOU