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John Mack

RTC2012-Confidence in the Final Geometry – Detailed Coordination, Prefabrication, Multi-Trade Preassembly. John Mack. Herrero Contractors, Inc. VDC / BIM Department Manager at Herrero Contractors, Inc. 26 years in the construction industry Last 3.5 as a general contractor

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John Mack

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  1. RTC2012-Confidence in the Final Geometry – Detailed Coordination, Prefabrication, Multi-Trade Preassembly John Mack Herrero Contractors, Inc

  2. VDC / BIM Department Manager at Herrero Contractors, Inc. 26 years in the construction industry Last 3.5 as a general contractor Previous 22.5 years in the mechanical and plumbing industry Doing BIM/VDC for 18 years Union trained plumber Ran detailing department for two large mechanical contractors Helped design software for third party AutoCAD and Project Management programs Been involved with Lean Construction for 7+ years. Participate with Lean Construction Institute (LCI), Center for Integrated Facility Engineering (CIFE) and Project Production Systems Laboratory (P2SL). President of the San Francisco Navisworks User Group (SFNUG). John Mack

  3. Established 1955 • Second Generation Family Owned Business • Areas of Operation: Northern California and anywhere else our customers take us • Construction Employers Association’s safety award for the past four years • Primary focus is Integrated Lean Project Delivery • Providing Preconstruction and Construction Services • All Projects Done Using VDC • Full Time VDC Employees For Other Examples Visit Our Website at www.herrero.com • Affordable Housing Healthcare Historical Restoration and Renovation • Retail Higher Education K-12 Schools Hospitality Residential Tenant Improvement

  4. Topics Qualifying the Background Models Establishing the Team Building Coordination • Few RFI’s and Change Orders During Construction Layout Fabrication, Delivery and Installation • Cost Savings in the Field • More Prefabrication • Just in Time Delivery to Field • Smaller Crews Sizes • Better Safety • Better Field Productivity • Less Rework

  5. Qualifying the Background Model

  6. Qualifying the Background Models • Does the model match the dimensions • Can the model be used for clash avoidance / building coordination • Can we use the model for model based quantity takeoff • Can we use the model for model based estimating • Can we use the model for time based field simulations • Can we use the model for field layout • Is the architect willing to partner with us to make the model usable for any of the above items that do not work

  7. Does the model match the details and dimensions

  8. Can this model be used for Clash Avoidance

  9. Can we use this model for model based quantity takeoff or model based estimating

  10. Can we use this model for time based field simulation

  11. Draw Download Layout Can we use this model for field layout

  12. Will the architect partner with us to build one model to meet all needs

  13. Using the Models for Building Coordination

  14. The lingering question…”When do we bring the trade partners on board?” Current methods suggest that TPs are brought on during CD phase Sometime in during late SD to Early DD is best to start qualifying the models and documents What trade partners are needed early? Steel Fabricator, Metal Framer, HVAC (wet and dry), Plumber, Fire Protection, Electrical, Dry Wall, Data and Security Wiring (cable tray) Steel Fabricator is the most important to bring on to eliminate redraw based on structural installation. This is a top reason for redraw Why are the TPs needed? Work with design team to make model and drawings reflect the actual construction Start team building between trades, builders and designers to get in tune with the project at an early phase to speed up the construction Minimize RFI’s and Change Orders during construction Bringing the Team Together

  15. The Collocation Benefit Shared server allows for real time drawing updates. Coordination is done all week long while modeling. Ease of communication with other trades in room. Shared resources such as plotter, printer, fax, etc. Good to have a place for a projection screen. If no Collocation Establish set coordination meetings once a week that everyone can meet online. 1st & signoff meeting in person Understand that more than one meeting a week is disruptive to model production. Look into setting up some kind of distance collaboration for non-meeting days. The Collocate or Not

  16. Define the purpose of the model. Why are you building a model? What do you want to gain from it? Electronic Data Exchange. How are you going to exchange data? FTP, Buzzsaw, Projectwise, some web based software, CDRom’s using sneaker net. Get access setup for everyone as soon as possible. Eliminate Waste Try to draw in series instead of in parallel. Establish a point that the drawing of the model changes hands from design team to construction team that works for your project. This will vary on every project based on team expertise and schedule. Use products like Navisworkson a projector screen for clash detection instead of light tables. More precise and less time needed. Keep Trade Partners Working and Same Pace Creating the Model

  17. Mindmap for Model Usage

  18. Model the Problems You Need to Solve Defining Information Needed Data Hand-Off vs. Collaboration Reduce Redundant (or Un-needed) Information Define Data Exchange Methods Early Set achievable goals for team and assign to performers Planning the Process

  19. Development of explicit handoffs between team members Tracking of the latency of responses during the design coordination process Development of explicit process goals and value stream at the beginning of the process (purpose of model, prefab etc.) Process Issues / Questions

  20. Level of detail drawn in model. Dependant on what phase the of project. Hangers, supports and seismic. Misc. metals Small pipe and conduit. Structural steel bracing and gussets. Junction / Pull boxes. Bus duct. Carry over lessons learned from past projects on what worked and did not work. What the team feels is valuable. Caution!! Too much detail can cause CPU crashes. Software seems to be ahead of the hardware. All 3d project may result in floor plans to be broken down into small pieces to be productive. Avoid crashing and slow drawing regeneration. Vista 64 bit seems to help, but not a full solution. Establishing Level of Detail

  21. Tracking Level of Detail

  22. Use Tolerances Between Trades to Build it Real-Must Have Accurate Models

  23. Using the Model for Layout

  24. Laser Guided Layout: Total Station A total station is an optical instrument used in modern surveying. It is a combination of an electronic theodolite (transit), an electronic distance measuring device (EDM) and software running on an external computer

  25. Background with survey points

  26. Background with layout and survey points-3876 points to layout

  27. Tripod and Beam Clamp Usage Total Station Setup

  28. Left Picture: Sheet Metal Strap • Right Picture: Pipe Hangers Layout on metal deck

  29. Proper training from vendor is a must Do not change crews if possible Use composite crew to save multiple setups in same area Teach the user how to add points to the layout in the field General Contractor buy in Control lines from G.C. Scheduled time for Total Station layout to minimize floor congestion A couple hard dimensions for manual verification Mount unit as solid as possible – minimal vibration ACCURATE DRAWN MODELS to for Layout Dimensions Lesson Learned: Must Haves

  30. Saves time in field Saves time detailing No need to dimension drawings. Layout is accurate Do not have tape measure growth Trades can layout a floor simultaneously (using composite crews) Lessons Learned: Pros (Pluses)

  31. Setting up the unit multiple times to cover an area can be time consuming. Information can be lost if system crashes. Limitations due to “line of sight” usage. Movement of floor can cause disruptions of service. Too many people in area can be frustrating Unit limited to file size. Shiny objects interfere with the beam. Too many boxes to keep track of. We built a custom gang box just for storage for the Total Stations. Lessons Learned: Cons (Deltas)

  32. Using the Model forFabrication, Delivery and Installation

  33. Pre-fab from 3-D Model & Just InTime (JIT) Delivery 2. Bill of Materials from 3D Model 3. System assembled on site 1. 3D Model of Plumbing System • More confidence in pre-fab due to accurate 3D modeling • Right material at the right time • 50% more plumbing pre-fab than conventional

  34. Piping Trade Partner Using the Models

  35. Process Rack Bench Fabrication

  36. Process Rack Cart Loading

  37. Loading Process Rack Cart

  38. Loaded Process Cart Rack

  39. Process Rack Labeling

  40. Process Rack Delivery Truck

  41. Process Rack Pick to Building Floor

  42. Process Rack Field Installation

  43. Process Rack Installed

  44. Plumbing Trade Partner Using the Models

  45. Bundled Pipe for Fabrication (Left)Plumbing Fabrication (Right)

  46. Fabricated Plumbing (Left)Capped for Shipping (Right)

  47. Water Closet Wall Fabrication

  48. HVAC Trade Partner Using the Models

  49. Model Plan View of Building Floor

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