copyright roadscanners oy 2012. all rights reserved. · road doctor® laser scanner package:...

Laser Scanner Technique in Road ConditionMonitoring and Problem Diagnostics

Copyright Roadscanners 2013. All Rights Reserved.

byPekka Maijala and Jani Irvankoski

Roadscanners, Finland


ROADSCANNERS

TOOLSServices – Software - R&D - Instruments

FOCUSTraffic Infrastructure Condition Management

ROADSCANNERS EXPERTISE:

EM Techniques in NDT Road Surveys


905 nm8-12 microm0.1 – 1 m

GPR Thermal CameraLaser Scanner

ROAD DOCTOR® ROAD CONDITION SURVEY VEHICLE


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.


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


Rut leftRut rightMax rutRidge

byWire method,orCutting edge method

Rut Depth Measurement: RDLS Benefits


Remission data is used for lateralpositioning and results arerepeatable fromrun to run and from year to year !

RUT DEPTH CALIBRATION


Correlation Between RDLS Maximum Rut Depth Data and Profilometer Data



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


Edge drops

Verge heights

Measuring Ditch Depths


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

Copyright Roadscanne

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:


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


Rovaniemi Street NetworkRoughness 2012 – Eastern City Main Streets

Acceleration 10 m mean (m/s^2)


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


Ground truth20 km/h40 km/h60 km/h80 km/h

Pavement cross fall

Measuring traffic safety risksrelated to road cross fall:

warping risk


Integration of Laser Scanner Data with 2D or 3D GPR Data

Integrated Analysis of 2D Laser Scanner, GPR and FWD data


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

copyright roadscanners oy 2012. all rights reserved. · road doctor® laser scanner package:...

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