The present invention relates to a concrete-filled steel tube column structure which enables easy arrangement and connection of vertical reinforcements by using a diaphragm in a steel pipe and enhances the precision of the construction operation regarding filling concrete or coupling a steel frame while reducing the amount of steel consumed and minimizing the earthworking area for acquiring a foundation by applying a top-down method. The present invention includes: a steel pipe to be filled with concrete; a plurality of diaphragms respectively having a concrete pouring hole formed on the center; multiple reinforcement holes formed on the surface, and coupling end units which are arranged on the outer rim to be coupled to the flanges on the steel frame; and a plurality of vertical reinforcements alternatively arranged on the reinforcement holes on the diaphragms.;COPYRIGHT KIPO 2014
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