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AASHTO Subcommittee on Construction Virginia Beach, Virginia August 2, 2011 Barry D. Siel, P.E. Senior Geotechnical Engi

Fabrication and Placement of Drilled Shaft Reinforcing Cages. AASHTO Subcommittee on Construction Virginia Beach, Virginia August 2, 2011 Barry D. Siel, P.E. Senior Geotechnical Engineer FHWA-RC. Attributes of Rebar Cages to Assure Good Constructability. Longitudinal Reinforcing.

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AASHTO Subcommittee on Construction Virginia Beach, Virginia August 2, 2011 Barry D. Siel, P.E. Senior Geotechnical Engi

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  1. Fabrication and Placement of Drilled Shaft Reinforcing Cages AASHTO Subcommittee on Construction Virginia Beach, Virginia August 2, 2011 Barry D. Siel, P.E. Senior Geotechnical Engineer FHWA-RC

  2. Attributes of Rebar Cages to Assure Good Constructability

  3. Longitudinal Reinforcing

  4. Selecting Bar Sizes: A Practical Compromise • Make Bars as Large As Possible for Better Flow Paths for Concrete (Constructability) • Make Bars as Small As Possible to Minimize Crack Size (Durability) • Splices Use Only Lap or Mechanical Splices Locate Splices As Deep As Possible

  5. Splice 50 ft Below Top of Shaft

  6. Transverse Reinforcing

  7. Transverse Reinforcing

  8. Cage Design for Constructability • Clear Spacing Between All Bars  5 D of Largest • Coarse Aggregate or 5 inches, (whichever is • larger) to Allow Placement of Concrete • Bundle Bars if Necessary • Tie Transverse Steel Every Lap

  9. Concentric Rebar Cages

  10. External Centralizer

  11. External Centralizer

  12. External Centralizer

  13. Concrete Cover and Location Tolerance

  14. Partial-LengthRebar Cage

  15. Essentials of Cage Design for Constructability • No Out-Hooks if Casing Method is Possible • Make Cages Full Depth if Casing Method is Possible • Do Not Allow Welding Unless Weldable Steel is Specified

  16. Support Cage Above Bottom

  17. Internal Bracing

  18. Internal Bracing

  19. Cage with Internal Bracing

  20. Lifting Cages

  21. Lifting Cages

  22. Lifting Cages

  23. Lifting Cages

  24. Lifting Cages

  25. Lifting Cages

  26. Practical Tips on Storing and Handling Rebar Cages • Storage Keep it clean • Cage Pick Up: No permanent distortion Use of temporary stiffeners • Use of Centralizers: External & Internal • NDT Access Tubes: Straight & Parallel

  27. QUESTIONS? AASHTO Subcommittee on Construction Virginia Beach, Virginia August 2, 2011 Barry D. Siel, P.E. Senior Geotechnical Engineer FHWA-RC

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