Form Work

Form Work:

Form work is temporary or permanent molding material which is used to provide mold to concrete or other material it is also known as shuttering. It is basically use in construction works.

            The work under the specifications consist of the furnishing of all plant, labor, equipment's, appliances and materials are in performing all operation in connecting with supply and initialization of form work for the purpose of shuttering in concreting work, complete in strict accordance with this section of the specification and the applicable drawing and the subject according to the terms and conditions. It is made of different materials such as timber, steel, plywood etc.

Material of Form work

Plywood

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From sheathing and panels

Timber

Form framing and sheathing and shoring

Steel

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1. 
   Permanent forms
2. Columns and Joints forms 
3. Welding of permanent forms
4. Heavy forms and false work

Use Ties Anchors and Hangers

For securing form work against placing loads and pressure

Steel frame shoring

For form work support

Steel joints

For form work support

Coating

Facilitate form removal

Removal of Form Work

           Removal of form work after concrete on time is very necessary. Made of mistake in removal of form work can result of huge damage.Right ti,e of removal of form work is given below.

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For columns and wall vertical form work = 16-24 hours

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Soffit form work to slab = 3 days

1. Soffit to beam = after 7 days ( Props should be re fixed and props should be removed if span between 0 to 4.5 m  = 7 days
2. If span is more than 4.5 m =14 days
3. For arch up to 6 m = 14 m if more than 6 m then it will take = 21 days

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Storage and Delivery

Storage

Form work should be stored, after cleaning and preparing for re-use if used before in such manner that access to all different materials id available. Material which can be affected by weathering should be stored in appropriate building or under cover or shed.

Delivery

The delivery of the form work shall be done in such manner that damage can be prevented and where means of transpiration should be reach easily

Important points for Form work

• Earth cut shall not be used as forms for vertical surfaces of reinforced concrete work unless required as such or permitted by the engineer. Mud concrete shall not be permitted without the prior approved by the engineer.
• Former shall be of wrought timber, steel, plywood, proprietary building boards and such special materials.Which give the required finish to the surface of concrete. Wooden formwork shall be free from loose knots and shall be wall seasoned.
• Requirement for facing material are given in section relevant to finishing of formed surface. The maximum deflection of facing material reflected in concrete surfaces exposed to veiw shall be 1/240 of the span between structural members.
• Where as-cast surface, including natural plywood-form-finish are specified, the panels of material against which concrete is cast shall be orderly in arrangement with joints between panels planned in approved relation to openings, building corners and other architectural features.
• Forms shall not be re-used if there is any evidence of surface wear and tear. which would impair the quality of the surface finish. Forms shall be thoroughly cleaned and properly coated before  re-use.
• \Positive means such as wedges or jack for accurate adjustment and for proper removal of shores and struts shall be provided and all settlement shall be monitored during concrete placing operation. Forms shall be securely braced against lateral deflection.
• Wood forms for wall opening shall be constructed to facilitating loosening, If necessary to counteract swelling of the forms.Wedges used for final adjustment of the forms prior to concrete placement shall be fastened in position after the final check.
• Form work shall be so anchored to shores or to other supporting surface or members that upward or lateral movement of any part of the form work system during concrete placement will not occur.
• Runways or plants for moving labour and equipment shall be provided with struts or legs and shall be supported directly on the form work or upon the structural member without resting on the reinforcing steel.All surface of form and embedded materials shall be cleared of any accumulates mortar or grout from previous concreting and of all other foreign material before placing fresh concrete.
• Wood form\s for wall openings shall be looser soon as this can be accompanied without damage to the concrete.