Formwork design vs falsework design key differences


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Formwork design vs falsework design key differences

  1. 1. CONCRETE FORMWORK CONCRETEDavid H. Glabe, P.E. Presented by FORMWORK© 2012, DH Glabe & Associates, Westminster, CO 80031 All Rights Reserved
  2. 2. Guide to Formwork for Concrete ACI 347R-03• Chapter 1 – Introduction• Chapter 2 – Design• Chapter 3 – Construction• Chapter 4 – Materials
  3. 3. FORMWORK• ACI 347, Chapter 1, Section 1.2Formwork – total system of support for freshly placed concrete, including the mold or sheathing that contacts the concrete and all supporting members, hardware, and necessary bracing.• CDOT, Section 601.11Falsework is defined as any temporary construction used to support vertical loads for a structure until it becomes self-supporting. Formwork is the temporary structure or mold used to retain plastic or fluid concrete in its designated shape until it hardens.
  4. 4. Formwork or Falsework??
  5. 5. Formwork v. Falsework• ACI - Formwork includes Falsework• CDOT – Formwork and Falsework are separate• Formwork is the “Jello” Mold that holds fresh concrete• Falsework supports formwork and other structures (such as precast girders)
  6. 6. Formwork – the “Jello Mold”There are two types of Formwork: 1. Vertical Forms 2. Horizontal FormsVertical Forms are used to hold pressureHorizontal Forms are used to hold weight
  7. 7. Vertical FormsVertical Forms are used to form:  Walls  Columns  Piers  Abutments  Beamsides  Other Vertical Concrete Surfaces
  8. 8. Vertical Form: Wall Form
  9. 9. Vertical Form: Shear Wall
  10. 10. Vertical Form: Retaining Wall
  11. 11. Vertical Form: Sidewall/Abutment
  12. 12. Horizontal Forms• Horizontal Forms are used to form: Bridge Decks Floors Overhangs Other Horizontal Concrete Elements
  13. 13. Horizontal Form: Metal Bridge Deck
  14. 14. Horizontal Form: Bridge Overhang
  15. 15. Horizontal Form: Bridge Overhang(Cantilevered Beams)
  16. 16. Formwork or Falsework?
  17. 17. Pressure or Weight?
  18. 18. Pressure• Vertical Forms are designed to resist pressure. Form Pressure is affected by: The Concrete Mix The Rate of Placement The Temperature of the Concrete The Weight of the Concrete
  19. 19. Weight• Horizontal Forms are designed to hold the weight of the concrete. The design weight is determined by:The Depth of the ConcreteThe Unit Weight of ConcreteThe Amount of Reinforcing
  20. 20. Concrete StructuresThe Quality of the finished product is determined by:MaterialsDesignConstructionPlacement of the Concrete
  21. 21. Manufactured FormsWhat is the Pressure Capacity?
  22. 22. Job-Built FormsIs it designed according to specification?Is it constructed according to the design?
  23. 23. Does it meet Project Specifications?
  24. 24. Success?Success is measured by how well the JelloMold conforms to the owner’s expectations.Is it the right shape?Are the length, height and width correct?Is it within tolerance?Is it in the right location?
  25. 25. The Perfect Wall?? Bad Joint Blemish
  26. 26. What do you think?
  27. 27. Is the concrete being placed properly?
  28. 28. FalseworkFalsework is used to support fresh concrete and the Jello Mold it is in. Falsework is also used to support other structures such as precast girders, steel girders, and existing bridges.
  29. 29. Falsework Supporting Pier Cap Formwork
  30. 30. Falsework Supporting Precast Concrete Girders
  31. 31. Formwork-the “jello”mold Wall forms hold pressure. Deck Forms hold weight. Falsework holds formwork. Watch your tolerances. What are their qualifications? What are your qualifications?