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Sfobb Dec08

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New San Francisco - Oakland Bay Bridge Surveying Presentation

New San Francisco - Oakland Bay Bridge Surveying Presentation

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Transcript

  • 1. The Survey for the New San Francisco Oakland Bay Bridge December 1 st , 2008 ASCE Dallas Branch Meeting
  • 2. Presentation Topics
    • An Introduction to the Project
    • Key Bridge Components
    • Geodetic Surveying and Tectonic Considerations
    • Transition Span OBG’s
    • Footings (T1 & E2)
    • SAS Tower
    • SAS OBG’s
  • 3. Project Limits San Francisco Oakland Treasure Island Yerba Buena Island
  • 4. Introduction
    • The New Bridge
      • Designed by Ty Lin and Moffett Nichol JV
      • Constructors - American Bridge/Flour JV
  • 5. SAS Components
  • 6. Surveying Challenges
    • Unique single tower design requires extreme survey accuracy
    • Complex OBG Deck Geometry (e.g., pre-camber)
      • Primary geodetic control network (Order B)
      • Steel component fabrication tolerances (1 mm  3 mm depending on specific dimensional criteria)
      • Thus survey accuracies must be 5 x to 10 x better than the tolerances
  • 7.
      • Project Area sits on a single tectonic plate
      • No discernable scale or rotation seen in the HTDP output
      • Presented Results to Client
    Primary Geodetic Control and Related Issues, e.g., Tectonic Motion
  • 8. Transition Span Survey For Caltrans
    • USA Steel Fabrication Verification - Portland
      • Transition Spans
      • First Survey Attempt by Others Failed
      • Original Fabricator went out of Business
  • 9. Conventional Precision Survey Methods
  • 10. Conventional Network 95% confidence regions exceed project tolerance (3 mm)
  • 11. State of the Art Technology
    • Laser Tracker
  • 12. Primary Control
    • Applied Technology
      • Precision prisms
      • Drift nest tools
      • Circle tools
      • Edge tools
      • Hidden point tools
      • Etc.
  • 13. Leica Laser Tracker and 1.5″ Precise Sphere
  • 14. Laser Tracker Survey of the Transition Span OBG’s
  • 15. T1 Footing Survey – Corpus Christi
    • Five Elements
      • Dimensions
      • Pile Sleeve Radii and Orientation
      • Dowel Locations
      • Location and Axis of 438 Bolt Holes
      • Dowel and Bolt Hole Template
  • 16. Pile Sleeve Analysis
  • 17. T1 Footing Pile Sleeve Alignment and Key Dimensions
  • 18. T1 Footing Organized Chaos
  • 19.  
  • 20.  
  • 21.  
  • 22.  
  • 23.  
  • 24.  
  • 25. T1 Footing Survey – Corpus Christi
    • Use a Laser Tracker
    • Work at Night
      • Minimize ambient conditions flux
      • Easier access with minimal other work
      • Network based on 63 surveyed dowel locations
  • 26. Dowel Survey Results
  • 27. Template Survey Results
  • 28. T1 Footing at KOS
  • 29. T1 Footing Delivery
  • 30. Driving the Piles
  • 31. T1 Footing in Place
  • 32. T1 Footing Installed
  • 33. ZPMC Fabrication Facility Shanghai
  • 34. ZPMC
  • 35. Tower Survey - China Tower Fabrication
    • Getting Oriented (no pun intended)
  • 36. The Basic Tower Design
  • 37. Tower Mock-up Surveys
    • China Tower/Deck Fabrication – First Survey
      • The Project Site
      • Steel Fabricator in Shanghai
      • Mock up Survey
        • 3 Elevations of the Tower
        • To Prove Capability
        • Actual Sections 40 M
        • Survey for
          • Dimensions
          • Flatness
          • Orthogonality
          • Torsion
          • Alignment
  • 38. Tower Survey
    • China Tower Fabrication
      • Survey Using Laser Tracker
  • 39. Tower Shaft Survey
    • China Tower Fabrication
      • Performing the Survey
  • 40. Tower Shaft Survey
    • China Tower Fabrication
      • Performing the Survey
  • 41. Control Network and Object Observations
    • Network Design
    • Point Cloud
      • Maximum Residual found was 0.023mm (0.0009’)
  • 42. Survey Report (Shaft Dimensions)
  • 43. Survey Report (Shaft Skin Analysis)
    • Results
      • Flatness
      • CI = 0.5 mm
      • (1/50 th inch)
  • 44. Survey Report (Stiffener Locations and Orthogonality)
  • 45. Survey Report (Shaft Torsion Analysis)
  • 46. Alignment at Shaft Splice
  • 47. OBG Jig Survey
    • Use of jigs to maintain OBG fabrication geometry
  • 48. Jig Under Construction
  • 49. OBG Survey
  • 50. Ice Cream Break
  • 51. Shanghai Surveys
    • Towill Engineer with Buddy from Shanghai Hash House Harriers
  • 52. Thank You

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