Precast column and method of manufacturing the same

A method of manufacturing a precast column, comprising:

• providing a bottom mold;
• providing a base and disposing the base on a side of the bottom mold, the base comprising:
• a plurality of couplers disposed on the bottom mold;
• and
• a plurality of stirrups surrounding the plurality of couplers;
• providing a main spiral reinforcement and a plurality of ancillary spiral reinforcements, the plurality of ancillary spiral reinforcements being disposed around and partially overlapping with the main spiral reinforcement;
• connecting one end of the main spiral reinforcement and one end of each of the plurality of ancillary spiral reinforcements to the base;
• providing a hollow tube and disposing the hollow tube in the main spiral reinforcement, one end of the hollow tube being connected to the base, so that the hollow tube, the main spiral reinforcement and the ancillary reinforcements together form a main structure;
• providing a top mold and disposing the top mold on one side of the main structure that is away from the base;
• providing a plurality of main reinforcing bars and passing the plurality of main reinforcing bars through the main structure so that each of the plurality of main reinforcing bars is connected to the corresponding one of the plurality of couplers;
• providing a pair of side molds and disposing the pair of side molds on two opposing sides of the main structure and those of the base, and connecting the two opposing ends of the pair of side molds to the bottom mold and the top mold, respectively;
• and
• pouring concrete into the space formed by the bottom mold, the top mold and the pair of side molds.