3-D Modeling Implementation

Transcription

1 3-D Modeling Implementation Presented January 31, 2013 Douglas Townes FHWA Resource Center

2 WORKFLOW FOR ELECTRONIC DATA TRANSFER WHEN USING AMG IN CONSTRUCTION Charles Jahren, PhD Iowa State University

3 OVERALL DIAGRAM

4 FIRST SECTION

5 DETAILED SURVEY

6 DETAILED DESIGN

7 SECOND SECTION

8 Contractor Modeling Workflow

9 Contractor Modeling Workflow Obtain the data files and plans from the owner NO Are the electronic files included? YES Are the electronic files with vector data? YES NO

10 Contractor Modeling Workflow Paper CAD Drawings Import data into Software Import data into Software Shoot Survey Data. Verify with Owner Survey Data Verify Owner Survey Data 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 Digitize the site boundary, contours and other elements (tedious and time consuming)

11 Contractor Modeling Workflow Build electronic data surfaces. Verify with the paper plans 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 Build cyberspace project using 4-D Convert to machine ready file

12 Contractor Modeling Workflow Obtain the data files and plans from the owner NO Are the electronic files included? YES Are the electronic files with vector data? YES NO

13 Contractor Modeling Workflow Paper CAD Drawings Import data into Software Import data into Software Shoot Survey Data. Verify with Owner Survey Data Verify Owner Survey Data 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 Digitize the site boundary, contours and other elements (tedious and time consuming)

14 Contractor Modeling Workflow Build electronic data surfaces. Verify with the paper plans 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 Build cyberspace project using 4-D Convert to machine ready file

15 Contractor Modeling Workflow

16 What is the Take Away? Try to find a way to Green!

17 Implementing a Model Based Approach to Design at Wisconsin DOT August 21, 2012 WisDOT Methods Development

18 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

19 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

20 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.

21 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

22 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.

23 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

24 3D Surface Model Requirement WisDOT will implement a 3D Surface Model Delivery Requirement on projects starting after July Model content requirements and other details will be released Q4 of 2012.

25 3D Surface Model Content Concepts

26 3D Surface Model Content Concepts

27 3D Surface Model Content Concepts

28 3D Surface Model Content Concepts

29 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

30 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 Design o Construction o Integration with GIS o Operations o Maintenance o Planning

31 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

32 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)

33 Typical Contractor Investment when incorporating AMG 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

34 Typical Contractor Project Management changes 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

35 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

36 Night Work Advantages of AMG at night: Accurate grading in spite of reduced visibility Increased safety due to fewer personnel on the ground

37 Design Alternatives Temporary Alignments: NSB-NWA Eliminated a traffic switch. Saved three weeks on the schedule.

38 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

39 Team Effort 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.

40 Survey Control Points 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

41 Site Calibration 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.

42 Construction Surfaces 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.

43 Construction Surfaces - Comments 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

44 Construction Surfaces Contractor Comments 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 twiceonce in the office and a second time in the field. Conflicts/Claims are reduced

45 Questions???