How to Calculate Formwork?
Formwork is an essential component of any construction project, as it provides support and shape to the concrete structure. However, it can be difficult to calculate the amount of formwork required for each component of the project. In this article, we will provide you with a guide on how to calculate formwork for footing, slab, beam, columns, and wall.
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How to calculate formwork for footing?
The first step in calculating formwork for footing is to measure the dimensions of the footing. The width and length of the footing are multiplied to determine the area in square feet. Then the depth of the footing is measured and added to the height of the side forms to determine the total height of the form. Finally, the total height is multiplied by the perimeter of the footing to determine the total formwork needed in square feet.
How to calculate formwork for slab?
To calculate formwork for a slab, you need to measure the length and width of the slab in feet. Then, multiply these dimensions together to calculate the area of the slab. Add the thickness of the slab to the height of the side forms to calculate the total form height. Finally, multiply the total form height by the perimeter of the slab to determine the total formwork required.
How to calculate formwork for beam?
To calculate formwork for a beam, you need to measure the length and width of the beam in feet. Then, multiply these dimensions together to calculate the area of the beam. Add the height of the side forms to the height of the beam to calculate the total form height. Finally, multiply the total form height by the perimeter of the beam to determine the total formwork needed. And the concrete beam formwork has many types.
How to calculate formwork for columns?
Calculating formwork for a column requires measuring the diameter and height of the column in feet. Next, multiply the diameter squared by pi (3.14) to obtain the area of the column. Add the height of the side forms to the height of the column to determine the total form height. Finally, multiply the total form height by the perimeter of the column to determine the total formwork required.
How to calculate formwork for wall?
To calculate formwork for a wall, you need to measure the length and height of the wall in feet. Then, multiply the length and height to obtain the area of the wall. Finally, add the thickness of the wall to the height of the side forms to calculate the total form height. Multiply the total form height by the perimeter of the wall to determine the total formwork needed.
Calculating formwork for each part of the construction project is essential in determining the materials and costs required for a successful project. By following the guidelines provided for footing, slab, beam, column, and wall, construction professionals can calculate the exact formwork required for each component. With the right calculations and materials, construction projects can be completed safely, accurately, and on time. At TECON, one of the leading specialists in formwork and scaffolding engineering, we provide high-quality formwork solutions to help construction professionals achieve these goals.
Measurement of Concrete Formworks for Payment ...
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Measurements of concrete formwork (shuttering) is required for payment to the contractor for the concrete work completed. The payment to contractor depends on whether the cost is included with the concrete construction per unit quantity or formwork is paid separately, as mentioned in the conditions of contract.
How to Measure Formworks?
The formwork is measured in terms of area that is in contact with the concrete surface.
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Parts of Formworks for Beams and Slabs
For example, the formwork for concrete footing will be calculated as the surface area of four sides of foundation only. Bottom of the footing is resting on earth, there is no need of any formwork and top of footing is open.
Plan and Elevation of RCC Footing
From the above footing plan and elevation, it can be seen that formwork area required will be
2 x (2 + 3) x 0.6 = 6 m2
Similarly, for a reinforced concrete beam, the measurement of formwork will be taken as the combined surface area of two sides and bottom of the beam.
Issues in Formwork Measurements
- Normally, the forms are used more than once in concrete construction. But the payment is calculated based on the total contact area of the formwork with concrete and reuse of the forms is not taken into account. Thus, the price per unit area of formwork can be reduced for reuse of the forms. Aluminium and steel forms are reused for many number of times than wooden forms.
- Complicated shape of concrete makes the formwork installation costlier than the simple formwork installation because of labor cost and inability to reuse these forms.
- A construction plan is required to reuse the forms maximum number of times to make the construction cost effective.
Deduction of formwork area should not be taken for:
- Intersection of beams
- Intersection of beams and columns and walls
- Any openings or cutouts in slabs
Units of Formwork Measurement
Formworks are measured in terms of area. So any unit such as square meter, square foot, square centimetre can be adopted. But generally, square meter and square foot of the contact area with concrete is taken as the unit of measurement.
The dimensions of a formwork should be measure correct to the centimetre or inches whichever the case may be.
Formworks are measured as just contact area, not area of formwork, as shown below:
Contact Area = 2h(L+B)
The measurements of formwork are carried out separately for each type of concrete works such as following:
- Foundations, footings, bases of columns etc. and for mass concrete and precast shelves.
- Walls of any thickness including attached pilasters, buttresses, plinth and string courses etc.
- Suspended floors, roofs, landings, shelves and their supports and balconies.
- Lintels beams, girders and cantilevers
- Columns, pillars, posts and struts.
- Stairs (excluding landings) except Spiral Staircase
- Spiral staircases (including landings)
- Arches
- Domes, vaults, shells roofs, arch ribs and folded plates
- Chimneys and shafts
- Well steining
- Vertical and horizontal fins individually or forming box, louvers and bands
- Waffle or ribbed slabs
- Edges of slabs and breaks in floors and walls
- Cornices and mouldings
Read More:
Types of Formwork (Shuttering) for Concrete Construction
Plastic Formworks for Concrete &#; Applications and Advantages in Construction
Concrete Formwork Design Considerations &#; Basis for Concrete Formwork Design
Wooden Concrete Formwork Design Criteria with Calculation Formulas
Concrete Formwork Loads and Pressure Calculations
Concrete Formwork Removal Time, Specifications and Calculations
Formwork (Shuttering) for Different Structural Members -Beams, Slabs etc
Formwork Safe Practices Checklist
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