BASIC CONCEPT OF FORM WORK AND REQUIREMENT OF A GOOD FORM WORK SYSTEM.

FORM WORK

The mould made up from some rigid materials such as timber or steel plates in which concrete is placed and in which it is hardens is called as formwork.

Form work is generally made from inexpensive timber planks.

These are combined or stick together to form a required mould for structural members like beams, slabs, columns, foundation etc....

Steel formwork is used in the form of plates which can be bolted together to form the different moulds of different shapes.

Formwork is combination of- Shuttering, Centering, Staging, Scaffolding.

1. Shuttering

Shuttering is a vertical temporary arrangement which is arranged to bring concrete in a desired shape.

Formwork which supports vertical arrangement is known as shuttering.

Formwork for columns, footings, retaining walls is called as a Shuttering.

2. Centering

Centering is a temporary arrangement & part of formwork which is arranged to support horizontal members.

In a technical point of view, the formwork for floor beams & Slabs is called as a Centering.

3. Scaffolding

Formwork is arranged to support the structural members, whereas scaffolding is provided as a worker’s platform around the building to work at heights.

Scaffolding is a movable or fixed platform depending upon the use and site conditions.

4. Staging

Materials such as wooden ballies, pipes, props, jacks which support both shuttering & centering are known as Staging.

FORM-WORKS GENERALLY CONSISTING OF TWO PARTS 

1. Mould or platforms.

2. Support system or centering.

MATERIALS USED FOR FORMWORK - 

The materials used in the formwork are depends upon their availability and the cost.

Mainly three materials are used for formwork 

1. Timber 

2. Plywood 

3. Steel

REQUIREMENT OF A GOOD FORMWORK 

Following are the main factors which can insure a good formwork 

1. Quality

2. Safety

3. Economy

now let us discussed all the three main points in details....

1. Quality

The formwork should give correct right angles and plane surface so that finishing cost after the formwork is removed can be minimized.

The form work should be leak proof to avoid any leaking of cement slurry which result in honeycomb and segregation after removal of formwork.

2. Safety 

Formwork should be strong enough to take the dead loads and live loads during the construction and at the time of pouring the concrete so that there is no accident and there is no danger to structure or labours.

The joints should be rigid enough to avoid the shagging of the formwork.

3. Economy

The cost of construction should not be high.

it should be easily removable without any damage, so that it can be repetitively used.

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