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TRANSCRIPT
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3-D Modeling Implementation
Presented January 31, 2013
Douglas Townes FHWA – Resource Center
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WORKFLOW FOR ELECTRONIC DATA TRANSFER WHEN USING AMG IN
CONSTRUCTION
Charles Jahren, PhD
Iowa State University
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OVERALL DIAGRAM
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FIRST SECTION
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DETAILED SURVEY
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DETAILED DESIGN
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SECOND SECTION
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Contractor Modeling Workflow
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Contractor Modeling Workflow
Are the electronic files
included?
Are the electronic files
with vector data?
NO
NO
YES
YES
Obtain the data files and plans from the
owner
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Contractor Modeling Workflow
Import data into Software
Shoot survey Data . Verify with Owner Survey Data
Digitize the site boundary, contours and other elements
(tedious and time consuming)
Verify/refine existing surface data in register
Verify Owner Survey Data
Import data into Software
Paper CAD Drawings
Shoot Survey Data. Verify with Owner Survey Data
Digitize the site boundary, contours and other elements
(tedious and time consuming)
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Contractor Modeling Workflow
Build electronic data surfaces. Verify with the
owner plans
Build electronic
data model from scratch
Build electronic models
using some owner data
Build cyberspace project using
4-D
Build the project in cyberspace
using 4-D
Convert to machine ready file
Build electronic data surfaces. Verify with the
paper plans
Build cyberspace project using
4-D
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Contractor Modeling Workflow
Obtain the data files and plans from
the owner
NO
NO
YES
YES
Are the electronic files
included?
Are the electronic files
with vector data?
-
Contractor Modeling Workflow
Import data into Software
Shoot survey Data . Verify with Owner Survey Data
Digitize the site boundary, contours and other elements
(tedious and time consuming)
Verify/refine existing surface data in register
Verify Owner Survey Data
Import data into Software
Paper CAD Drawings
Shoot Survey Data. Verify with Owner Survey Data
Digitize the site boundary, contours and other elements
(tedious and time consuming)
-
Contractor Modeling Workflow
Build electronic data surfaces. Verify with the
owner plans
Build electronic
data model from scratch
Build electronic models
using some owner data
Build cyberspace project using
4-D
Build electronic data surfaces. Verify with the
paper plans
Build cyberspace project using
4-D
Build the project in cyberspace
using 4-D
Convert to machine ready file
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Contractor Modeling Workflow
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What is the Take Away?
Try to find a way to Green!
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Implementing a Model
Based Approach to Design
at Wisconsin DOT
August 21, 2012
WisDOT Methods Development
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Topics
• WisDOT Civil 3D implementation status
• WisDOT model oriented design workflow
• Implementing 3D Surface Model Deliverable
• Future of Roadway Models at Wisconsin DOT
• Implementing Civil 3D Specific Delivery
Requirements
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WisDOT Model Concept
Definitions
• 3D Surface Model
• Produced for projects with Grading work
• Includes surfaces for AMG operations of Grading, Base
Course, and Paving
• Initial model deliverable requirement will be 3D Surface
Models
• Roadway Model
• Evolution of model concept to include information for
increased utility in design and construction processes, and
ultimately expanded to downstream roadway lifecycle
processes
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Model-Based Design Part of WisDOT
Implementation of 3D Technologies in
Design & Construction
Plan with Five Active
Initiatives:
• Statewide Real-Time
Kinematic GPS Network.
• DTM Data Collection.
• 3D Design.
• Automated Machine
Guidance.
• Field Technology and
Inspection.
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Requirements of the Design
Workflow
• Civil 3D Design Workflow goal to develop
construction ready surface models during
the design process
• Must produce surface models with
sufficient detail to support AMG
operations
• 3D Surface Model output must be
synchronized with plan sheets
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Model Sharing Pilots
• Determine Benefits of Providing 3D Roadway Models at Pre-
Bid.
• Determine Utility of 3D Models for Bid Preparation.
• Establish Requirements for “Construction –Ready” 3D
Models Flowing from Design Process.
• Includes Model Content and Format.
• Field Test “Construction Readiness” of 3D Models.
• Identify and Implement any Changes to Design Workflows
Necessary for Achievement of “Construction Readiness” in
3D Models.
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Model Sharing Pilots Results
• Surface Model was used in bid preparation activity
• Plan activities to greater level of detail, reducing uncertainties
• Identify potential sites for borrow/waste, and communicate with
property owners
• Surface models were construction ready – validated design
workflow
• Model content changes
• Add longitudinal breaklines as visual aids for operators
• Add surfaces for all subbase layers
• Staged models not needed for AMG operations
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3D Surface Model Requirement
• WisDOT will implement a 3D Surface Model
Delivery Requirement on projects starting
after July 2014.
• Model content requirements and other
details will be released Q4 of 2012.
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3D Surface Model Content Concepts
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3D Surface Model Content Concepts
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3D Surface Model Content Concepts
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3D Surface Model Content Concepts
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3D Surface Model Content Concepts
• Surfaces
Exist Top Finished Base Course Subbases Datum Pavement
• Surface model data density will be design speed dependent
• Surface models must be synchronized with plan sheets
• Additional content
• Longitudinal breaklines
• Horizontal alignments
• Vertical alignments
• Superelevation transition information
• Fully staged model requirement will be decided on project-by-project
basis
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Roadway Model Evolution
• Ability to increase information included with the
3D Model will grow
• Methods of accessing information will become
easier
• WisDOT looking to expand use of Roadway
Models in:
o Integration with GIS
o Operations
o Design
o Construction
o Maintenance
o Planning
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How Can Our Roadway Model Goals Be Met?
• To answer this question WisDOT has:
• Learned more about how model design
software functions & compatibility between
software
• Monitored “TransXML” Development
• Monitored collaborative efforts between
Bentley and Autodesk
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Contractor’s perspective
Several of the following slides came from a presentation by Edgerton Contractors, Inc. of Oak Creek Wisconsin. They have been reproduced and paraphrased here as “typical comments” from a contractor using Automated Machine Guidance (AMG)
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• GPS represents 15% to 25% of the cost of new machines
• GPS machines require more frequent maintenance: pins, bushings, cutting edges
• Three full-time personnel: Data Manager, Survey Coordinator/Manager, Engineering Manager
• GPS Machine Guidance Training – creation and distribution of ‘YouTube’ style videos via the internet
• GPS Rover Training - annual classroom session, one-on-one, regular assessments, 12 month process
• Three year hardware development cycle
• Continuous software and hardware beta testing for new hardware
Typical Contractor Investment when incorporating AMG
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• Pre-build the project – plan check and RFI’s
• Night Work efficiencies improved
• Alignment-based design alternatives
• Design and Visualization of interim surfaces which provide drainage, construction access without over-excavating
• Match existing grades for temporary wideners or cross-overs
• Existing Grade to subgrade in one operation
• Planning tools / confidence to execute ever challenging construction sequences
Typical Contractor Project Management changes
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Pre-Build the Project – RFI (example)
RFI: ECI-042, Wall 420 • Horizontal Alignment of Wall • Curve Table inconsistent with
coordinate callout. • N 0.05-ft, E 1.82-ft
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Night Work
Advantages of AMG at night: • Accurate grading in spite of reduced visibility • Increased safety due to fewer personnel on the ground
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Design Alternatives
Temporary Alignments: NSB-NWA • Eliminated a traffic switch. • Saved three weeks on the schedule.
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Constructability Issues
• Interim Surfaces • Visualization during planning • Means and Methods • Confirm safe slopes and adequate storm water control
This is actually an example of 4-D design by the contractor
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• The Team: – Owner and contractor representatives
– CAD operators, surveyors, inspectors
– Skilled, take pride in their work, just want to build a good project
• Operational framework: – Divide the work.
– Collaboration – not competition.
– Share everything.
– Trust but verify.
• Success in this step solves half the problems.
Team Effort
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• Owner specification must identify how site “Site Calibration” will occur – One example: “Designate a set of control points including
a total of at least 6 horizontal and vertical points…”
• Owner selects and sets the control points. – Owner’s surveyor measures and then publishes XYZ
coordinates on each point for all GPS users on the project.
• Contractor and owner share the responsibility of
collaborating the set points. • Contractor to set base station locations. • Contractor verifies these points
Survey Control Points
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• Goal: Provide the generic information that can be used by anyone using any GPS system to stake or grade the site consistent with the Owner’s surveyor-of-record.
• Definition: Published list of the NEZ coordinates and LLH coordinates for each control point.
• All users of the data must verify internal consistency of the data before using for construction.
Site Calibration
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• Construction surfaces are defined as electronic data representation of the owner’s design surfaces that can be loaded into survey and machine guidance instruments.
• Contractor is responsible for the creation and implementation of Construction Surfaces.
• The Contractor must verify that the construction surfaces match the owner’s design surfaces before using the data in the field.
• Any and all errors are fixed by the Contractor prior to construction.
Construction Surfaces
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• CAD files reduce model costs significantly.
• Format: Land XML
• Include: – Alignments – Horizontal and Vertical
– All surface lines on Plan Details
– Pre-Construction Topographic Survey
– Finish Grade Surface: break lines, not triangles
– ROW limits
– Utilities
– Structure lines, example: CL of bearing for bridge abutments
– Coordinate call-outs for truncated arcs, vertical and horizontal
Construction Surfaces - Comments
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• Send in an RFI on all inconsistencies.
• Visual checks are not adequate. Numerical checks to the 0.01-ft are required.
• Inspectors benefit by taking a high-profile role in checking the surface.
• The project gets built and inspected twice- once in the office and a second time in the field.
• Conflicts/Claims are reduced
Construction Surfaces Contractor Comments
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Questions???