If the duct bank is 100 feet, then the total volume of concrete needed is 3.215 square feet times 100 feet, which equals 321.5 cubic feet of concrete. Now multiply this number by the total length of the duct bank. By dividing 462.96 by 144, the result is 3.215 square feet. RED-E-DUCT® is the precast duct bank system that cuts the time and cost of underground infrastructure, while enhancing worker safety. This is the cross-sectional area occupied by the concrete alone.Ĭonvert the cross-sectional area occupied by the concrete from square inches to square feet by dividing that number by 144. So, 576-square inches minus 113.04 square inches equals 462.96 square inches. Subtract this number from the total cross sectional area of the duct bank. For a three-by-three, that is 3.14 times 4 times 9, which equals 113.04 square inches. The conduit area is pi times the radius squared times the number of conduits. The conduit area would be the cross-sectional area of one conduit times the number of conduits. Now subtract from this number the total area occupied by the conduit. In this three-by-three example, that would equal 24 inches times 24 inches or 576 square inches. Multiply the total width and total height. Since this is a three-by-three duct bank, its height will also be 24 inches.Ĭalculate the cross-sectional area of the duct bank. Repeat step 2 using the number of vertical conduits instead of the number of horizontal conduits. Concrete encased and direct buried ducts (except site lighting ducts) shall be 4 minimum. PART 3 - EXECUTION 3.1 DUCT BANK INSTALLATION REQUIREMENTS A. Marker strip shall be red plastic, 6 wide, and labeled to indicate type of service. Calculate the total height of the duct bank. Contractor, without cost to The University of Michigan.
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