A building requires 10 drilled piers with a shaft diameter of 30 inches, a bell diameter of 54 inches, and a bell angle of 60 degrees. The height from the bottom of the bell to the top of the pier is 15 feet. Using a waste factor of 15 percent, determine the number of cubic yards of concrete needed to pour the drilled piers.
What will be an ideal response?
Find the height of the bell using Equation 11-2 or Figure 11-6 from the textbook:
Find the bell volume using Equation 11-4 or Figure 11-6:
Length of shaft (ft) = 15? – 1.732? = 13.268?
Volume of concrete in piers (cy) = Count × (Volume in bell + Volume in shaft)
Volume of concrete in piers (cy) = 10 × (17.12 cf + 65.13 cf) = 822 cf / 27 cf per cy
Volume of concrete in piers (cy)= 30.4 cy
Add 15% waste and round off.
Volume of concrete (cy) = 30.4 cy × 1.15 = 35.0 cy – Use 35 cy
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