A building requires four drilled piers with a shaft diameter of 24 inches, a bell diameter of 48 inches, and a bell angle of 50 degrees. The height from the bottom of the bell to the top of the pier is 10 feet. Using a waste factor of 12 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) = 10? – 1.192? = 8.808?
Volume of concrete in piers (cy) = Count × (Volume in bell + Volume in shaft)
Volume of concrete in piers (cy) = 4 × (8.74 cf + 27.67 cf) = 146 cf / 27 cf per cy = 5.4 cy
Add 12% waste and round off.
Volume of concrete (cy) = 5.4 cy × 1.12 = 6.0 cy – Use 6 cy
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