| 摘要 |
PURPOSE: A manufacturing method for a centrifugal reinforced concrete manhole is provided to increase the strength of a product using centrifugal force and to cut down material costs and freight by decreasing the thickness of a product. CONSTITUTION: The manufacturing method for a centrifugal reinforced concrete manhole comprises the steps of: selecting a mold for manufacturing a manhole having the wanted height, circumference and outward appearance(s101); weighing 19¯23 percent cement, 27¯31 percent fine aggregate, 39¯45 percent thick aggregate and 7¯9 percent water(s102); forming concrete by putting the weighed materials in a mixer, then mixing for appointed hours(s103); cutting off wires into the appointed length, then manufacturing a reinforcing bar using a steel caging machine(s104); attaching a connector die on an internal wall of the mold(s105); placing a stripper on the internal wall of the mold(s106); installing a reinforcing bar in the mold(s107); rotating the mold having the reinforcing bar at the appointed speed, placing the mixed concrete, then shaping(s108); curing the concrete surface in a steam curing tank(s109); stripping a product from the mold(s110); and forming a floor plate on the lower part of the product with concrete(s111).
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