Estimate Lesson 2 Formworks
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Formworks
the term given to either temporary or permanent molds into which concrete or similar materials are poured.
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Formworks
Formula in Finding the Materials for Square and Rectangular Column Forms
P = 2 ( a + b) + 0.20
P = lateral perimeter of the columna = shorter side of the columnb = the longer side of the column0.20 = constant value for the lapping of joints
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Sample Formworks Computation for Column
a. Solve for the Lateral perimeter: P = 2 ( a + b ) + 0.20P = 2 ( 0.40 + 0.60 ) + 0.20P = 2.20 m
b. Multiply the height and number of columns to get the lateral surface area.Area = P x H x No. ColumnsA = 2.20m x 5.0m x 10 A = 110 sq. metersc. Divide areas by 2.88 to get number of plywood
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Sample Formworks Computation for Column (cont)c. Divide areas by 2.88 to get number of plywood
d. Solving the 2” x 2’ wood frame, multiply 29.67 board foot
39 Plywood x 29.67 = 1,157 board foot
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Circular Column
1. Solve for the circumference of one column2. Multiply by column height to find the surface
area3. Multiply the area by the number of columns
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Formworks
Formula in Finding the Materials for Beams and Girder Forms
P = 2 ( a + b) + 0.10
P = lateral perimeter of the columna = shorter side of the columnb = the longer side of the column0.10 = constant value for the lapping of joints
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Board Foot of Wood Frame for Column and Beam per Plywood Form
Size of Wood Frame
Thickness of Plywood Form
Post Beam
6 mm (1/4")
12 mm (1/2")
6 mm (1/4")
12 mm (1/2")
2" x 2" 29.67 20.33 25.06 18.66
2" x 3" 44.50 30.50 37.60 28.00
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Scaffoldings
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The End for now…