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Er. Parbhakar Dwivedi



The following reference shall be used in conjunction with this procedure

  • Technical Specifications
  • IS Codes : IS 456
  • Drawing
  • BOQ

Resources Used

A. Manpower

  • Skilled Labour
  • Unskilled Labour

B. Machinery

  • Measurement tape.
  • Hacksaw
  • Blade
  • Ties and braces
  • Hammer
  • Crane(For Shifting)

Safety Points

  • When erecting, altering and/or dismantling formwork there should be inadequate free fall distance underneath the working area.
  • Stripping of formwork for structural elements like cantilever, beams/slabs shall be done only after mobilization of full restraining forces.
  • Adequate fire-fighting facilities/fire extinguishers to be fixed in carpentry yard.
  • Appropriate PPE to be worn at all times.

Work Procedures:

Material for Form Work

  • Propping and Centering: All propping and centering should be either of steel tubes with extension pieces or built up sections of rolled steel.


  • Staging should be as designed with required extension pieces as approved by Engineer-in- Charge to ensure proper slopes, as per design for slabs/ beams etc. and as per levels as shown in drawing. All the staging to be either of Tubular steel structure with adequate bracings as approved or made of built up structural sections made form rolled structural steel sections.
  • Centering and shuttering of any upper floor being cast shall be suitably supported on one floor below the top most floors already cast.


  • Shuttering used shall be of sufficient stiffness to avoid excessive deflection and joints shall be tightly butted to avoid leakage of slurry. If required, rubberized lining/ tape of material as approved by the Engineer-in-Charge shall be provided in the joints.
  • The shuttering should also be properly repaired before use and properly cleaned to avoid stains, honey combing, seepage of slurry through joints etc.
  • Runner Joists: MS Channel or any other suitable section of the required size shall be used as runners.
  • Assembly of beam head over props. Beam head is an adopter that fits snugly on the head plates of props to provide wider support under beam bottoms.
  • Form work shall be properly designed for self-weight, weight of reinforcement, weight of fresh concrete, and in addition, the various live loads likely to be imposed during the construction process (such as workmen, materials and equipment). In case the height of centering exceeds 3.50 meters, the prop may be provided in multi-stages.


  • Suitable camber shall be provided in horizontal members of structure, especially in Cantilever spans to counteract the effect of deflection. The form work shall be so assembled as to provide for camber. The camber for beams and slabs shall be 4 mm per metre (1 to 250) or as directed by the Engineer-in-Charge, so as to offset the subsequent deflection, for cantilevers the camber at free end shall be 1/50th of the projected length or as directed by the Engineer-in-Charge.

Surface Treatment

  • Oiling the Surface: surfaces are coated with suitable mould oil which acts both as a parting agent and also gives surface protections.

Erection of Form Work (Centering and shuttering)

  • Any member which is to remain in position after the general dismantling is done should be clearly marked.
  • Material used should be checked to ensure that, wrong items/ rejects are not used.
  • Bracing, struts and ties shall be installed along with the progress of form work to ensure strength and stability of form work at intermediate stage. Steel sections (especially deep sections) shall be adequately restrained against tilting; overturning and form work should be restrained against horizontal loads. All the securing devices and bracing shall be tightened.
  • When adjustable steel props are used. They should:
  • Be undamaged and not visibly bent.
  • Have the steel pins provided by the manufacturers for use.
  • Be restrained laterally near each end.
  • Have means for centralizing beams placed in the foreheads.
  • Screw adjustment of adjustable props shall not be over extended.
  • Double wedges shall be provided for adjustment of the form to the required position wherever any settlement/ elastic shorting of props occur. Wedges should be used only at the bottom end of single prop. Wedges should not be too steep and one of the pair should be tightened/ clamped down after adjustment to prevent shifting.
  • No member shall be eccentric upon vertical member.
  • The number of nuts and bolts shall be adequate.
  • All provisions of the design and/or drawings shall be complied with Cantilever supports shall be adequate.
  • Props shall be directly under one another in multistage constructions as far as possible.
  • Required camber shall be provided over long spans.
  • Supports shall be adequate, and in plumb within the specified tolerances.

Inspection of Form Work

The completed form work shall be inspected and approved by the Engineer-in-Charge before the reinforcement bars are placed in position.

  • Proper form work should be adopted for concreting so as to avoid honey combing, blow holes, grout loss, stains or discoloration of concrete etc. Proper and accurate alignment and profile of finished concrete surface will be ensured by proper designing and erection of form work which will be approved by Engineer-in-Charge.
  • Shuttering surface before concreting should be free from any defect/ deposits and full cleaned so as to give perfectly straight smooth concrete surface. Shuttering surface should be therefore checked for any damage to its surface and excessive roughness before use.

Removal of Formwork

The formwork shall be so removed as not to cause any damage to concrete. Centering shall be gradually uniformly lowered in such a manner as to permit the concrete to take stresses due to its own weight uniformly and gradually to avoid any shock or vibration.

IS Codes for aluminium & other light metals & their alloys
S. No. Types Minimum Period Before Striking Formwork
a) Vertical formwork to columns, walls & Beams 16 to 24 hours.
b) Soffit formwork to slabs(Props to be re-fixed immediately after removal of formwork) 3 days
c) Soffit formwork to beams(Props to be re-fixed immediately afterremoval of formwork) 7 days
d) Props to slabs
I Spanning up to 4.5 m 7 days
II Spanning over 4.5 m 14 days
e) Props to beams and arches
I Spanning up to 6 m 14
II Spanning over 6 m 21
  • For any deviation, if required shall be discussed with Engineer in-charge at site


  • Where necessary, formwork shall be so arranged that the soffit form, properly supported on props only can be retained in position for such period as may be required by maturing conditions.
  • Close watch shall be maintained to check for settlement of formwork during concreting. Any settlement of formwork during concreting shall be promptly rectified.


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PD Consulting Engineers Pvt. Ltd. Transforming construction for a new generation "Cost, Quality & Project management"

QS & Cost management, Bill Checking / Audit, Technical Auditors, Valuation, Contract and Tendering, Project Management, Project Planning, Quality Control, Consulting Engineers, Structural Consultancy