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formwork

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UMP

UMP

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  • 1. GOOD MORNING For My Non Muslim Students : Treat your parent s kindly and respectfully all the time
  • 2. For My Muslim Students
  • 3. FORMWORK
  • 4. Introduction Formwork is a mould or box into which wet concrete can be poured and compacted so that it will flow and finally set to the inner profile of the box or mould.
  • 5. It is a classic temporary structure in a sense that: a) It can be erected quickly b) Highly loaded for a few hours during the concrete placement c) And within a few days it is disassembled for future use
  • 6. Function  Forms mold the concrete to desired size and shape and control its position and alignment  Formworks also act as a temporary structure that support: a) it’s own weight + b) The freshly placed concrete c) Construction live loads (material , human, logistic)
  • 7. Good formwork would have the following characteristics that is: a) Safe b) Cost effective or economical c) High Quality – finished concrete surface is of acceptable quality - in the correct location - able to produce the required shape and surface
  • 8. Formwork Design Loads include in design process are as follows a) Fresh concrete b) Rebar c) Formwork material d) Wind and lateral loads e) Live loads due to – Formwork construction - Reinforcing installation - Concrete placement
  • 9. Material for Formwork Construction Among the material that can be used for construction of formwork: a) Timber b) Steel c) Glass Reinforced Plastic d) Plastic e) Aluminium
  • 10. TIMBER FORMWORK
  • 11. Timber Formwork : For The Slab Timber Formwork: After Concrete Was Poured
  • 12. Advantages Among the advantages of this most traditional formwork are : a) Easy handling because it’s light weight b) Easy to disassemble c) Damaged parts can be replaced with new one d) Very flexible e) Easy to produce f) Easily available
  • 13. Disadvantages Among the disadvantages are : a) Can’t be used for long. Have limited re-use. b) If timber is dry, it will absorb moisture from wet concrete which could weaken the resultant concrete member. c) Timber with high moisture content (more than 20% moisture content), wet concrete will shrink & cup leading to open joints & leakage of grout
  • 14. a) High amount of waste b) Require high quality labor force and adequate supervision c) Time consuming when prepared for larger structure d) Limited spans
  • 15. STEEL FORMWORK
  • 16. Advantages Among the advantages of steel formwork are : a) Very strong and able to carry heavy load b) Easy to be fixed c) Uniform size and surface d) Can be used for a very long time e) Span longer than timber f) More durable than timber formwork
  • 17. Disadvantages Among disadvantages of steel formwork are : a) More expensive than wood
  • 18. FIBERGLASS REINFORCED PLASTIC FORMWORK It is used in components due to its a) moldability b) light weight c) Strength d) Toughness e) Reusable  The disadvantages is, this type of formwork is more expensive than timber formwork.
  • 19. PLASTIC FORMWORK Among the advantages are: a) Lightweight b) Reusable c) Chemical resistant d) Fungus and termites resistant e) Can be easily cut and nail by using wood working tools f) Non degradable g) Working with plastic formworks does not require the use of electric power.
  • 20. Plastic Formwork
  • 21. FORMWORK FAILURE
  • 22. Formwork failures are the cause of many accidents and failures that occur during concrete construction which usually happen when fresh concrete is placed Generally some unexpected event causes one member to fail, then others become overloaded or misaligned and the entire formwork structure collapses
  • 23. Causes Improper stripping and shore removal Inadequate bracing Vibration Unstable soil under mudsills, shoring not plumb Inadequate control of concrete placement Lack of attention to formwork details
  • 24. Inadequate bracing More frequent causes of formwork failure Inadequate cross bracing and horizontal bracing of shores is one of the factors most frequently involved in formwork accidents.
  • 25. Vibration Forms sometime collapse when their shores/ jack are displaced by the vibration caused by:  passing traffic  movement of workers & equipment on the formwork  the effect of vibrating concrete to consolidate it
  • 26. SAFETY PRECAUTION Among the precautions that can be taken to ensure formwork function as it suppose to be are as follow:  Material used for the construction of formwork must fulfill the specification.  Formwork is fixed firmly & properly  Construction area must be protected to prevent vandalism of formwork.
  • 27.  Warning sign must be put up at the area where the formwork is fixed to prevent entrance of people that may damage the formwork.  The formwork must be inspected before the concrete is poured.
  • 28. Permanent Formwork It’s a part of the permanent structure of the building. It is a structural element that is used to contain the placed concrete, mould it to the required dimensions and remain in place for the life of the structure.
  • 29. Permanent Formwork
  • 30. Advantages Among the advantages are: a) Reducing the skill level needed on site. b) Increase the potential for standardization and repetition. c) Permitting off-site fabrication in factory conditions followed by scheduled and appropriate deliveries. d) reduces construction waste
  • 31. d) Speeding up erection times, particularly in building works. Save time e) Eliminating the need to strike formwork and falsework. f) Allowing early access for following or concurrent operations. g) Eliminating the programme limitations of reuse of formwork. h) reduce construction and maintenance costs i) improve safety by reducing hazards during construction.
  • 32. Plan your affairs and take proper precaution