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Estimating the Forms of Circular Column |
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Saturday, 12 April 2008 09:01 |
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The plain galvanized iron sheet otherwise known as plain G.I. sheet is the most common materials used as a sheeting for circular, oval, elliptical or other types considering its versatility in forming any shape of geometrical design. Where G.I. sheet is specified as form for a cylindrical column, wood column, wood board and built-up supporters are necessary to form the circumferential arc frame. The standard dimension of the plain G.I. sheet is 90 centimeters wide by 2.40 meters long.
Estimating Procedure:
- Find the circumference of the circle where: C = 3.1416 x diameter
- Multiply the circumference by the column height. C x ht.
- Divide the result found in step 2 by 2.16 the effective covering area of one G.I. sheet.
- Where extra cuts could not be avoided, an allowance of 5 to 10% or a minimum of one sheet is sufficient.
- Solve for the number of supporters pf ribs. Divide the circumference by .10 if the spacing is 4” or .15 if the spacing is 6”.
- Provide 2 pieces circumferential supporters for every joint of the uniform which is equivalent to 90 cm. the width of one G.I. sheet.
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