The constructure method, manufacture method and a precast reinforced concrete column of building

The present invention relates to a concrete framework structure in which the framing of the structure in particular, also by making a concrete column in advance at work it is possible to form the concrete framework of a building with prefabricated operation is easy and quick of robustness and operation of the frame centrifugal forces of the structure which can improve the present invention relates to hollow precast reinforced concrete columns and a method of manufacturing the same and a reinforced concrete column construction method of a reinforced concrete column. Concrete pillar according to the present invention can support a higher load than the load bearing conditions required in the conventional structure accordingly increased in the higher density portion concrete strength to produce by using the centrifugal force during its manufacture, and. Thus the strong concrete columns with a strength increase is reduced the amount of unit cement as the size of the member smaller, making is possible to put more concrete columns of existing buildings, which may lower the production costs, widening the living space of substantial structure It is a useful invention. Precast concrete pillars, pillar main bars, bands reinforced concrete section, the splice sleeve, etc.