Mivan Formwork

• Mivan is basically an aluminium formwork system developed by one of the construction company from Europe.

• In 1990, the Mivan Company Ltd from Malaysia started the manufacturing of such formwork systems.

• Now a days more than 30,000 sq m of formwork used in the world are under their operation.

Mivan

• It is fast, simple, adaptable and cost – effective. It

produces total quality work which requires minimum maintenance and when durability is the prime consideration.

• This system is most suitable for Indian condition as a tailor–made aluminum formwork for cast–in–situ fully concrete structure.

• In this system of formwork construction, cast – in – situ concrete wall and floor slabs cast monolithic provides the structural system in one continuous pour.

• Large room sized forms for walls and floors slabs are erected at site. These forms are made strong and sturdy, fabricated with accuracy and easy to handle.

• They afford large number of repetitions (around 250).

Formwork Assembly

• MIVAN aims in using modern construction techniques and equipment in all its projects.

• On leaving the MIVAN factory all panels are clearly labeled to ensure that they are easily identifiable on site and can be smoothly fitted together using the formwork modulation drawings.

• All formwork begins at a corner and proceeds from there.

Four day cycleThe system usually follows a four day cycle: -• Day 1: -The first activity consists of erection of vertical

reinforcement bars and one side of the vertical formwork for the entire floor or a part of one floor.

• Day 2: -The second activity involves erection of the second side of

the vertical formwork and formwork for the slab

• Day 3: - Fixing reinforcement bars for floor slabs and casting of walls and slabs.

• Day 4: -Removal of vertical form work panels after 24hours, leaving the props in place for 7 days.

The Advantages of this system are...The MIVAN formwork is specifically designed to allow

rapid construction of all types of architectural layouts.1) Total system forms the complete concrete structure.2) Custom designed to suit project requirements.3) Unsurpassed construction speed.4) High quality finish.5) Cost effective.6) Panels can be reused up to 250 times.7) Erected using unskilled labor.

Limitations of MIVAN Formwork

• Even though there are so many advantages of MIVAN formwork the limitations cannot be ignored. However the limitations do not pose any serious problems. They are as follows: -

• It requires uniform planning as well as uniform elevations to be cost effective.

• Modifications are not possible as all members are cast in RCC.

• Large volume of work is necessary to be cost effective i.e. at least 200 repetitions of the forms should be possible at work.

• The formwork requires number of spacer, wall ties etc. which are placed @ 2 feet c/c; these create problems such as seepage, leakages during monsoon.

• Due to box-type construction shrinkage cracks are likely to appear.

• Heat of Hydration is high due to shear walls.

. No FACTOR CONVENTIONAL IN – SITU ALUMINIUM FORM SYSTEM

REMARKS

1 Quality Normal

Superior. In – Situ casting of whole structure and transverse walls done in a continuous operation,

Superior quality in “System housing”

2Speed of construction.

The pace of construction is slow due to step – by – step completion of different stages of activity the masonry is required to be laid brick by brick. Erection of formwork, concreting and deshuttering forms is a two – week cycle.

In this system, the walls and floors are cast together in one continuous operation in matter of few hours

System construction

is

much faster.

3 Aesthetics.

In the case of RCC structural framework of column and beams with partition brick walls is used for construction, the columns and beams show unsightly projections in room interiors.

The Room – Sized wall panels and the ceiling elements cast against steel plates have smooth finishing and the interiors

 

4External finishes.

Cement plastered brickwork, painted with cement – based paint. Finishing needs painting every in three years.

Textured / pattern coloured concrete facia can be provided. This will need no frequent repainting.

Permanent facia finishes feasible with minor extra initial cost

 5

Useful carpet area as % of plinth area.

Efficiency around 83.5%

Efficiency around 87.5%

More efficient utilization of land for useful living space.

6

Consumption of basic raw materials

 

Cement.

 

 

 

 

Reinforcing Steel

 

 

  

Normal

 

 

 

 Reinforcing steel required is less as compared to the in situ construction as RCC framework uses brick wall as alternative

 

 

 

 

Consumption somewhat more than that used in conventional structures.

 

  

It may, however will be slightly more than corresponding load – bearing brick wall construction

 

 

  

Although greater consumption strength and durability is also more

 

Steel requirement is more, as it is required for the shear wall construction.

7

Maintenance In maintenance cost, the major expenditure is involved due to :

   Repairs and maintenance of plaster of walls / ceiling etc.

   Painting of outer and inner walls.

The walls and ceiling being smooth and high quality concrete repairs for plastering and leakage’s are not at all required frequently.

It can be concluded that maintenance cost is negligible.

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