Mivan formwork system/Aluminium form work system: Mivan system/Aluminium form work system is a revolutionary form work system which has been successfuly used and developed, for forming cast in place reinforced concrete building structures.
Using this unique system, all wall, floor, slabs, beams, columns, balconies, togather with door and window, openings, are cast in place in a single site based operation.
The resulting building structure is very strong accurate in dimentions and tolarences, with a high quality of finish concrete surface and yet at the same time the Mivan formwork system is fast, adaptable and very cost effective.
Characteristics of the Mivan system are that it makes use of concrete as the principal building material for the prime reason of cost and accessibility. Cement, sand and stone are readily available in most countries.
Concrete also bring a additional benefits in terms of it's build quality, strength, it's resistance to earthquake tremors. It's resistance to fire, rot and vermin attack, it's low noise transmission with good thermal capacity and it's proven durability, giving long life, with little maintenance.
Contrary to general belief Mivan system or aluminium formwork system can construct all type of structures.
Column, beam and slab construction:
As compared to traditional method of construction, with Mivan system construction of these structures may be finished in a fraction of time.
The construction of RCC framework is flowed by slow and labour intensive follow-on wet trades, such as brick or block walls, which require heavy built-up plaster.
Wall and slab construction: Mivan system formwork makes full use of structurals efficiencies and operational advantage grained from this method of concrete structure construction.
A cellular building construction using all load bearing walls adds strength, realising a saving on steel and concrete comparative to other structural concrete systems such as column and beam or column and slab constructions.
The need for slow and labour intensive follow-on wet trades, such as internal brick or block work walls, is removed entirely and the high quality finished fromed the surface achieved by the aluminium panels eliminates the need for costly plastering, as only 4-5mm skim caoting of plaster is all that is required for a perfect finish.
Components of Mivan formwork or Aluminium formwork system:
Material: Panels are the basic element of Mivan formwork system. Panels are made from high strength of aluminium alloy with 4 mm thick skin plate and 6 mm thick ribbing under panel which stiffens the panel. This panel, even though liteweight has considrable stiffness and is capable of carrying large concrete weight, when concrete is in plastic stage.
Slab Components: The components which are used in slab formwork.
1. Slab panel: It forms the horizontal surface for casting of slab. It is built for proper safety of workers.
2. Slab prop head: It forms a V-shape prop head. It supports the slab panel and bears coming on the slab panel.
3. Mid/End beam: It helps to supports the beam at mid and end.
4. Slab corner: It is provided at corner of the slab. It helps in joining to slab and beam.
5. Beam splice bar: It is deck for the beam. This component supports to the dec and beam.
6. Prop length: It is the length of prop. It depends upon the height of the slab.
Beam Components: The components which are used in beam formwork.
1. Beam panel: It forms the sides of the beam. It is a rectangular structure and is cut acording to the size of beam.
2. Beam prop head: It forms the sofit beam. It is a V-shaped head for easily dislodging of the framework.
3. Mid/End beam: It helps to supports the beam at mid and end.
4. Slab corner: It is provided at corner of the slab. It helps in joining to slab and beam.
5. Beam splice bar: It is deck for the beam. This component supports to the dec and beam.
6. Prop length: It is the length of prop. It depends upon the height of the slab.
Beam Components: The components which are used in beam formwork.
1. Beam panel: It forms the sides of the beam. It is a rectangular structure and is cut acording to the size of beam.
2. Beam prop head: It forms the sofit beam. It is a V-shaped head for easily dislodging of the framework.
3. Bulk head horizontal: It is the bulk head for beam. It carries most of the bulk load.
4. Beam sofit panel: It supports the sofit beam. It is a plane rectangular structure of aluminium.
5. Sofit corner Internal: It helps in joining the internal corner of beam.
6. Sofit corner external: It helps in joining the external corner of beam.
Wall Components: The components which are used in wall formwork.
1. Wall panel: It forms the face of the wall. It is an aluminium sheet properly cut to fit the exact size of the wall.
2. Kicker: It forms the wall face at the top of the panels and act as a ledge to support.
3. Rocker: It is a supporting component of wall. It is L-shap panel having allotment hole for pin.
4. External corner: It helps in joining both external wall corner properly.
5. Internal corner: It helps in joining both internal wall corner properly.
6. Pin & wedge: It helps in joining two wall panel. It helps in joining two joint.
Procedure:
1. Pre-concreting:
(a) All slab surface shall be cleaned of all debries, concrete waste grease etc. On the cleaned slab surface, wall layout is correctly marked using a suitable marker.(b) All the formwork components shall be checked for any deformity and deformed components shall be kept aside.
(C) Formwork components are then applied with releasing agent as sugested by supplier. If there is no such recommendation, the same shall be sugested by RCC consultant. In any case releasing agent shall be from reputed manufacturer and it will not stain the concrete surface.
(d ) Formwork components shall be erected sequentially as per the numbering done on it and erection drawing from supplier shall be referred. Pins and wedge are lock to sure of different components of formwork in place.
(e) Level of beam and deck sofit shall be checked with the help of auto level. All walls shall be erected in true plumb. Slab surface for wall casting shall be perfectly levelled so that there is no gap between rocker and slab level. Rocker is erected first before erecting wall panels.
(f) All openings shall be checked level, plumb and size and sofits levels shall also be checked. All electrical conduits and electrical boxes shall be placed in correct position as per drawing and screwed to components. All wall ties shall be covered with the plastic sheet.
(g) Beam and deck props shall be checked for plumb. Working plateform shall be erected with brasket to external walls.
(h) Gaps (gabadi) in ply shall not be used to cover up any area. Instead 4-6mm thick aluminium sheet fabricated to correct size shall be used.
2. During concreting:
(a) Adequate supervision shall be kept during concreting to ensure that pin, wedge, etc. are not loosened due to vibration and dec/wall panels are not there original position.
(b) Gap in the formwork shall be scaled if any by masking tape. High frequency vibrators shall be used at all times during concreting. Use of kickers shall be made to act as supports for erecting next high of wall panels. Rate of pouring concrete shall not exceed 2m in height/Hr.
3. Post - concreting:
(a) Striking of formwork shall be done, after a pre decided period. Striking of formwork shall be done in following sequence:
I. Wall Forms,
II. Dec props,
III. Dec panels,
IV. Beam sofit props,
V. Beam sofi and beam side panels.
(b) Plastic sheet covering all ties shall be pulled out along with wall ties and holes shall than be grouted using approved non. Shrink material.
(C) After Striking all forms (concrete side face) shall be immediately cleaned with scraper whereas (non-concrete side faces) shall be cleaned off all dirt, concrete droppins, etc. using wire brush. Formwork component shall then be stacked as per supplier's instructions till further use.
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