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AASHTO Subcommittee on Construction Virginia Beach, Virginia August 2, 2011 Barry D. Siel, P.E. Senior Geotechnical Engineer FHWA-RC PowerPoint PPT Presentation


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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 Engineer FHWA-RC

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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


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Attributes of Rebar Cages to Assure Good Constructability


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Longitudinal Reinforcing


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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


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Splice 50 ft Below Top of Shaft


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Transverse Reinforcing


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Transverse Reinforcing


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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


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Concentric Rebar Cages


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External Centralizer


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External Centralizer


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External Centralizer


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Concrete Cover and Location Tolerance


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Partial-LengthRebar Cage


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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


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Support Cage Above Bottom


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Internal Bracing


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Internal Bracing


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Cage with Internal Bracing


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Lifting Cages


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Lifting Cages


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Lifting Cages


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Lifting Cages


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Lifting Cages


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Lifting Cages


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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


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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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