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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


Attributes of Rebar Cages to Assure Good Constructability


Longitudinal Reinforcing


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


Splice 50 ft Below Top of Shaft


Transverse Reinforcing


Transverse Reinforcing


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


Concentric Rebar Cages


External Centralizer


External Centralizer


External Centralizer


Concrete Cover and Location Tolerance


Partial-LengthRebar Cage


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


Support Cage Above Bottom


Internal Bracing


Internal Bracing


Cage with Internal Bracing


Lifting Cages


Lifting Cages


Lifting Cages


Lifting Cages


Lifting Cages


Lifting Cages


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


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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