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Stemwall Duct and Steel SB

Stemwall Duct and Steel SB. Look for PT Notes: there should be elongation greater than anticipated if failure of stemwalls occurred when stressing. Stemwall Differences. Stemwall Clearances Sloping Longitudinal Bars Hairpins Tying Ducts to Stirrups Holding Rebar in Place.

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Stemwall Duct and Steel SB

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  1. Stemwall Duct and Steel SB

  2. Look for PT Notes: there should be elongation greater than anticipated if failure of stemwalls occurred when stressing.

  3. Stemwall Differences • Stemwall Clearances • Sloping Longitudinal Bars • Hairpins • Tying Ducts to Stirrups • Holding Rebar in Place

  4. Stemwall Clearances • Detail • Rebar Sheet 64400 • Ducts Sheet 64424 • RFI - 67 • Letters • P82R Retracts RFI 67 • P86 discusses 25 MM stirrup and 75 MM Duct Clearances • P88 Final Tolerance Clarification • P115 Documents follow-up meeting • Tolerances Steel – 530.41 Concrete Forms 540.40 (b) (4) and Letter P088 -CRSI – effective depth “d” does not apply • Photos

  5. Hairpins • Letters • P086 discusses securing the ducts • P109 discusses protest • Details • Plan Sheets only require hairpins at flared ends • New DET3130 (not part of the contract) #3 bar at 4 ft centers • Submittal 40 R1 • Approved as noted. The note says the hairpins are not necessary for structural integrity of the structure. • Actual SB • Photo SB

  6. Sloping Longit Bar • Detail • Detail on Sheet 64424 • Letters • P082 references direction to comply with contract plan details. • RFI 67 • Photo

  7. Secure Ducts to Stirrups • Note on plan sheet 64424 • Letters • Letter P0108 • Photo SB (looking for evidence) • Photo NB

  8. Keep Rebar in place • Spec 530.41 • Spec 530.41 (b) • Photo’s • Ties and Dobies • Spreaders • Kick Boards

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