3D DESIGN FOR MACHINE CONTROL GRADING A Case Study of ODOT's I-5: Willamette River Bridge Project...
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Transcript of 3D DESIGN FOR MACHINE CONTROL GRADING A Case Study of ODOT's I-5: Willamette River Bridge Project...
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3D DESIGN FOR 3D DESIGN FOR MACHINE CONTROL MACHINE CONTROL
GRADINGGRADINGA Case Study of ODOT's
I-5: Willamette River Bridge ProjectEugene/Springfield, Oregon
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Tom Metcalf, PE– OBEC Consulting Engineers in Eugene,
Oregon– 13 years of roadway engineering
experience– Lead Roadway Engineer on the I-5:
Willamette River Bridge Project– Phone: 541-683-6090– Email: [email protected]
PRESENTATION BY:PRESENTATION BY:
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CASE STUDY BACKGROUNDCASE STUDY BACKGROUND
ODOT I-5: Willamette River Bridge Project– $150M bridge replacement project in Eugene,
Oregon
Twin 1900-foot-
long I-5 Bridges
Twin 1900-foot-
long I-5 Bridges
2500 feet of I-5
Roadway Work
2500 feet of I-5
Roadway Work
2300 feet of I-5
Roadway and Ramp Reconstruc
tion
2300 feet of I-5
Roadway and Ramp Reconstruc
tion
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How did machine control grading get incorporated into the I-5: Willamette River Bridge project?– Project is an alternative delivery project
where the prime contractor(Hamilton) participates in the design
– K&E Excavating requested machine control grading to be utilized because of cost savings
CASE STUDY BACKGROUNDCASE STUDY BACKGROUND
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ODOT utilizes a 3D design software program called InRoads to model proposed surfaces– Past version of InRoads were not as powerful
What is 3D Design?What is 3D Design?
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Note the
"tethered
modem"!
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Initiating
Redesign!
Initiating
Redesign!
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ODOT utilizes a 3D design software program called InRoads to model proposed surfaces– Past version of InRoads were not as powerful
What is 3D Design?What is 3D Design?
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Old industry standard – Minimized design effort (save design time and design expenditures) by providing just enough design data for field staff to "fill in the gaps"New industry standard due to machine control grading – Increased design effort to eliminate all gaps in 3D design to minimize "field modifications" during construction
How Machine Control Grading How Machine Control Grading Changes 3D DesignChanges 3D Design
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Used to do "close enough" 3D modeling–Why?
Remember – Past industry practice was to minimize design effort (save design time and design $$$) by providing just enough design data for field staff to "fill in the gaps"
– Examples?
How Machine Control Grading How Machine Control Grading Changes 3D DesignChanges 3D Design
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BEWARE: TECHNICAL CONTENT AHEAD!!!!!!
How Machine Control Grading How Machine Control Grading Changes 3D DesignChanges 3D Design
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Old = Large gaps between template dropsNew = Smaller gaps
How Machine Control Grading How Machine Control Grading Changes 3D DesignChanges 3D Design
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• Modeling around bridges, abutments and wingwalls
How Machine Control Grading How Machine Control Grading Changes 3D DesignChanges 3D Design
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Guardrail benches, sideslope transitions and structure section transitions
How Machine Control Grading How Machine Control Grading Changes 3D DesignChanges 3D Design
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Some modeling was accidentally overlooked, such as drainage features
How Machine Control Grading How Machine Control Grading Changes 3D DesignChanges 3D Design
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• Need experienced field staff to interpret design for "field fitting" gaps in the design
• Quantity overages since modeling is not accurately reflecting final field conditions
• Change orders for "filling in" the gaps in the design
Effects of Past 3D Design on Effects of Past 3D Design on Construction ProjectsConstruction Projects
• MORE RISK TO CONTRACTORS = MORE RISK BUILT INTO PROJECT BIDS = MORE EXPENSIVE PROJECTS FOR ODOT
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• Greatly reduces field interpretation of design• More accurate quantities• LESS RISK TO CONTRACTORS = LESS
RISK BUILT INTO PROJECT BIDS = LESS EXPENSIVE PROJECTS FOR ODOT
• This is a proven concept. For a number of years, contractors have been requiring and paying for this level of modeling effort from designers on design-build projects.
Results of New 3D Modeling Results of New 3D Modeling PracticesPracticeson Construction Projectson Construction Projects
• Design $$$ < Construction $$$
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• Must decide at the beginning of a project to do more detailed modeling– Difficult and time-consuming to upgrade
a design not tailored for machine control grading
• Introduces need for QA review of modeling– This results in substantially more design
time and design dollars
Impacts of New 3D DesignImpacts of New 3D Designon Engineering Effortson Engineering Efforts
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• How does the 3D design get to the construction equipment?
• Contractors don't use InRoads….they all have different proprietary software
• Have to convert design models to Proprietary software models for machines to "read"
• Designer must QC proprietary software models before work begins
• Increases design time and design expenditures
Impacts of New 3D DesignImpacts of New 3D Designon Engineering Effortson Engineering Efforts
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Can utilize this concept for other design disciplines, such as traffic control plans
– Converting 2D traffic control plans to 3D staging design
Impacts of New 3D DesignImpacts of New 3D Designon Engineering Effortson Engineering Efforts
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• ODOT's current design software is InRoads XM, and it is more than capable of generating the 3D designs required for machine control grading. This is not a futuristic concept. It has been utilized on a number of past and current projects.
• 3D designs require more design time and design budget.
• Embrace change = Better product = Reduced construction cost to ODOT
CONCLUSIONCONCLUSION
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Tom Metcalf, PE– OBEC Consulting Engineers – Phone: 541-683-6090– Email: [email protected]
QUESTIONSQUESTIONS