Centering & Shuttering Form Works

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Centering and Shuttering Form Works

Steel Shuttering Work, Bengaluru

Shuttering or form work is the term used for temporary timber, plywood, metal or other material used to provide support to wet concrete mix till it gets strength for self support. It provides supports to horizontal, vertical and inclined surfaces or also provides support to cast concrete according to required shape and size. The form work also produces desired finish concrete surface.



Shuttering or form work should be strong enough to support the weight of wet concrete mix and the pressure for placing and compacting concrete inside or on the top of form work/shuttering. It should be rigid to prevent any deflection in surface after laying cement concrete and be also sufficient tight to prevent loss of water and mortar form cement concrete. Shuttering should be easy in handling, erection at site and easy to remove when cement concrete is sufficient hard.


Types of Shuttering

  • Steel Shuttering
  • Wooden Planks Shuttering

  • Steel Shuttering Work, Bengaluru

    Steel Shuttering

    Steel shuttering plate is the best type of shuttering because this is water tight shuttering which can bear the load of cement concrete placed on it. This shuttering can be used for horizontal, vertical or any other shape required for the work. It gives leveled surface which has good appearance. This shuttering gives good appearance and pattern work according to architectural drawings. If the plaster is required, the thickness of plaster will be less. Being water tight shuttering, the strength of concrete with steel shuttering is comparatively higher.


    Note: As this is water tight shuttering, it is considered the best shuttering.


    Wooden Planks Shuttering

    Generally wooden planks shuttering is used by contractors because this shuttering is cheap and easily available. But this type of shuttering effects the strength of concrete and have some disadvantages which are given below.


    Disadvantages
  • This is not water tight shuttering as the size and thickness of planks differ and are not of same size. Due to this difference the water and cement flow to the ground from joints and reduce the strength of concrete.
  • Bottom level of RCC slab is not in straight line and the surface being uneven, the thickness of plaster is more which remains weak.
  • Due to leakage of cement slurry through joints, earth work below 'Ballies' may settle and create problems.
  • In some cases wooden planks can not bear the weight of concrete. Due to low strength there is bending or deflection in wooden planks. Sometimes the planks may break.

  • Steel Form Works

    This consist of panels fabricated out of thin steel plates stiffened along the edges by small steel angles. The panel units can be held together through the use of suitable clamps or bolts and nuts. The panels can be fabricated in large number in any desired modular shape or size. Steel forms are largely used in large projects or in situation where large number reuses of the shuttering is possible. This type of shuttering is considered most suitable for circular or curved structures.


    Steel forms compared with timber formwork:
  • Steel forms are stronger, durable and have longer life than timber formwork and their reuses are more in number.
  • Steel forms can be installed and dismantled with greater ease and speed.
  • The quality of exposed concrete surface by using steel forms is good and such surfaces need no further treatment.
  • Steel formwork does not absorb moisture from concrete.
  • Steel formwork does not shrink or warp.

  • Construction of formwork:

    This normally involves the following operations:


  • Propping and centring
  • Shuttering
  • Provision of camber
  • Cleaning and surface treatment

  • Order and method of removing formwork:
  • Shuttering forming the vertical faces of walls, beams and column sides should be removed first as they bear no load but only retain the concrete.
  • Shuttering forming soffit of slabs should be removed next.
  • Shuttering forming soffit of beams, girders or other heavily loaded shuttering should be removed in the end.

  • Rapid hardening cement, warm weather and light loading conditions allow early removal of formwork. The formwork should under no circumstances be allowed to be removed until all the concrete reaches strength of atleast twice the stresses to which the concrete may be subjected at the time of removal of formwork. All formworks should be eased gradually and carefully in order to prevent the load being suddenly transferred to concrete.

    Steel Shuttering

    Steel Shuttering Works

    Centering





    Steel Shuttering

    Steel Shuttering




    Steel Shuttering

    Steel Shuttering

    Steel Shuttering

    Concrete Mould

    Pillar Base