Presentation is loading. Please wait.

Presentation is loading. Please wait.

3D Engineered Models for Construction Part I - Introduction September 2012 Part 1 Introduction1.

Similar presentations

Presentation on theme: "3D Engineered Models for Construction Part I - Introduction September 2012 Part 1 Introduction1."— Presentation transcript:

1 3D Engineered Models for Construction Part I - Introduction September 2012 Part 1 Introduction1

2 What is 3D Modeling? Using a collection of intelligent computer objects that represent an original surface, in our case the design surface of a highway segment. The objects know their position in space and in some cases what they represent. Part 1 Introduction2

3 To better understand the design and locate possible conflicts and/or errors in the design. Why 3D Modeling? Part 1 Introduction3

4 4 Courtesy of Iowa DOT 3D Transportation Model

5 Part 1 Introduction5 Another 3D Model Courtesy of Iowa DOT

6 3D Cartesian Coordinates Part 1 Introduction6 Graphic courtesy of Curtis Clabaugh, WYDOT

7 Mapping Capabilities Part 1 Introduction7 Graphic courtesy of Curtis Clabaugh,WYDOT

8 A High Level Benefit of 3D Modeling Improves communication between the owner, consultant, contractor, prefabricators, and materials suppliers Part 1 Introduction8 Image courtesy of FHWA

9 Easier to get stakeholder buy in Identify possible errors before construction Visualize subgrade and potential utility conflicts Benefits to highway construction are similar to those realized in Building Information Modeling (BIM) Part 1 Introduction9 What are Some General Benefits?

10 Virtual construction to assess issues and improve communication prior to breaking ground! Part 1 Introduction10 Top Benefits for Owners Grade check 100% of constructed surface Locate as-built utilities on the fly Improved industry perception Material cost savings Photo courtesy of FHWA

11 Part 1 Introduction11 Top Benefits for Contractors Save labor of setting string line (paving) or stakes (grading) Stringless paving may limit need for traffic closures Increased productivity Increased efficiency Reduced labor costs Photo courtesy of FHWA

12 Part 1 Introduction12 Top Benefits for A/E Firms Identification of potential constructability issues earlier in the design process Better value to clients Improved accuracy in design Visual model verification provides design QC Image courtesy of FHWA

13 Part 1 Introduction13 Leaders in the Use of 3D Modeling Wisconsin DOT Iowa DOT North Carolina DOT Caltrans Land developers Design-builders

14 3D Engineered Models are a Building Block of the Digital Jobsite Part 1 Introduction14 Other Functions 3D Models Support Public outreach/marketing for projects Utilities – coordination and early issue identification 3D mapping and data storage Clash detection Earthwork quantities

15 Part 1 Introduction15 Challenges to Implementation Time investment from 2D to 3D Project selection – what characteristics to look for Coordination across key stakeholders (contractor, owner, designers, suppliers, etc.)

16 Where does designing stop and where does detailing begin? What becomes the legal record of the design? Can a 3D model be part of the contract documents? Can electronic plans legally represent the design? Part 1 Introduction16 What Challenges Need Consideration?

17 Project Development Considerations Part 1 Introduction17

18 3D modeling allows the existing and proposed features to be seen geospatially. Part 1 Introduction18 Plans and Evolution 2D plans with profile and cross-section 3D plans, electronic data files, and digital terrain models

19 Using a 3D model, we now have the capability to design and build accurately everywhere. Part 1 Introduction19 Limitations of 2D Plans in Construction Human error in reading plans Conflicts are not readily apparent No surfaces, just cross-sections We traditionally design and build accurately only at cross-sections

20 20 Several years old, sometimes Key Stakeholders and Process Elements Part 1 Introduction

21 Develop incremental detail of a virtual model by working continuously in a 3D environment Extract the traditional 2D contract plans and bid item quantities from the 3D design model Export 3D data files for construction and use of technology applications in the field Part 1 Introduction21 How is the Workflow Different from 2D to 3D?

22 A data package can be developed from the 3D model to support Automated Machine Guidance/Automated Machine Control Plug and Play equivalent once package is input to machine Part 1 Introduction22 What Activities Can the Model Support?

23 A process where design software and construction equipment are linked to direct the operation of machinery with a high level of precision, improving the speed and accuracy of the construction process. Part 1 Introduction23 What is Automated Machine Guidance (AMG)?

24 Part 1 Introduction24 Bulldozer Using AMG Photo courtesy of David White, Iowa State University

25 Part 1 Introduction25 Courtesy of Iowa DOT What the Machine Sees

26 Stakes String Lines String Lines with Sensors Lasers GPS Total Stations Types of Guidance Systems (Guidance Systems Evolution) Part 1 Introduction26 Photos courtesy of FHWA

27 Provides visual guide/grade information Stakes set by surveyor Field personnel read stakes and guide machine operator Using Stakes – Traditional Method Part 1 Introduction27 Photo courtesy of FHWA

28 Allows for machine control along a non- level surface Line represents a design surface at a particular elevation Using String Lines – Traditional Method Part 1 Introduction28 Photo courtesy of FHWA

29 Lasers are used for elevations A light bar on the cutting edge of a grader allows for up/down positioning GPS can be used to determine X-Y coordinates and pinpoint a location Users need different accuracies (we need survey level accuracy for highway projects compared with lower accuracy for recreational use or mapping) Using Lasers/GPS Part 1 Introduction29

30 Scrapers, dozers, excavators, motor graders, milling machines, pavers Automated Machine Control Applications Part 1 Introduction30 Photos courtesy of David White, Iowa State University

31 Earthworks Part 1 Introduction31 Photo courtesy of David White, Iowa State University

32 Courtesy of Ed Jaselskis Typical Concrete Paving Using AMG Part 1 Introduction32

33 Part 1 Introduction33 Typical Asphalt Paving Using AMG Photo courtesy of David White, Iowa State University

34 34 Grading Part 1 Introduction Photo courtesy of David White, Iowa State University

35 Case Study Colorado I-70 Project Part 1 Introduction35

36 Colorado DOT I-70: The Problem Expansive Soils Severe longitudinal undulations, rough ride, cracking Widely varying asphalt depths – average 15 Traditional mill/fill: consistent mill depth would maintain existing profile Part 1 Introduction36 Photo courtesy of FHWA

37 CDOT I-70: The Process No initial CDOT survey Contractor survey Specs allowed for AMG for milling Short timeline GPS survey – 5 passes at 25 EB/WB CDOT used MicroStation InRoads optimization to create 3D model with milling depths to balance humps and dips Part 1 Introduction37 Photo courtesy of FHWA

38 CDOT I-70: The Project Concrete Whitetopping pavement design required 8 minimum asphalt for 6 concrete Full depth 9 ¼ concrete where < 8 asphalt remains after milling Part 1 Introduction38 Photo courtesy of FHWA

39 CDOT I-70: AMG Milling Robotic Total Station – 600 intervals Milling machine – automatically directed mill depth Contractors surveyor performed independent check on original and milled surface Part 1 Introduction39 Photo courtesy of FHWA

40 CDOT I-70: AMG Milling (contd) Operation manually monitored Screen reports deviation from pre-set milled elevation Track height adjusted automatically to meet milled surface profile Part 1 Introduction40 Photos courtesy of FHWA

41 CDOT I-70: AMG Milling (contd) Greatly variable milling depths Part 1 Introduction41 Photo courtesy of FHWA Image courtesy of FHWA

42 CDOT I-70: Lessons Learned Colorado DOT – Better knowledge of technology prior to plan preparation – Need survey control by owner during construction – More accurate initial survey – tie in boundaries Contractor – There should only be one 3D model – Boundaries were a problem – even in rural setting – 8% allowable concrete overrun is very tight – CDOT survey (pre-bid) more competitive bids Part 1 Introduction42

43 Benefits – Quality Assurance, Cost Savings, and Schedule Savings Part 1 Introduction43

44 44 Quality Assurance Without 3D Modeling Part 1 Introduction Photo courtesy of FHWA

45 45 Quality Assurance With 3D Modeling Part 1 Introduction Photo courtesy of David White, Iowa State University

46 46 Several years old, sometimes Data Transfer: Benefits, Procedures, and Challenges Part 1 Introduction

47 Trans XML Autodesk BentleyCarlsonTrimbleTopconLeica 47 Preferred Import/Export Capabilities Part 1 Introduction

48 48 Leica Trimble Topcon Autodesk Bentley Carlson Another Import/Export Scheme Part 1 Introduction

49 Perceived AMG Benefits – Phase I Survey 49 Perceived AMG Benefits*ContractorAgency P/C Equipment Vendors Labor savings (direct cost on projects)96%76%80% Environmental-Fuel savingsN/A36%60% Project schedule compression86%57%93% Avoidance of re-work (re-grading)93%60%87% As-built documentation58%57%80% Ease of constructability review44%49%73% Jobsite safety68%44%60% Safety of the traveling publicN/A31%40% * Percentage of respondents choosing the benefit at the two highest risk levels Part 1 Introduction Source: NCHRP 10-77

50 Productivity Impacts 50Part 1 Introduction Source: NCHRP 10-77

51 McGraw Hill Smart Market Report – The Business Value of BIM Implementation of GPS Controlled Highway Construction Equipment (Vonderohe, University of Wisconsin) AASHTO AMG Quick Reference Guide NCHRP Part 1 Introduction51 Additional Resources

52 3D Modeling can provide for increased efficiencies in projects by providing an intuitive user interface, identifying potential issues early on, and linking to cost effective construction methods such as AMG. Session II will focus on the application of these practices and components, along with challenges and project selection criteria. Part 1 Introduction52 Summary

53 Charles Jahren, ISU Douglas Townes, FHWA Chris Schneider, FHWA Questions? Part 1 Introduction53

Download ppt "3D Engineered Models for Construction Part I - Introduction September 2012 Part 1 Introduction1."

Similar presentations

Ads by Google