COLUMN JOINT STRUCTURE

PROBLEM TO BE SOLVED: To provide a column joint structure capable of reducing the amount of used steel material and capable of reducing field work.SOLUTION: In a column joint structure, a first column 1 of reinforced concrete construction, and a second column 2 of steel construction or concrete-filled steel pipe construction, which comprises at least a steel pipe 20, are joined together. A plurality of column main reinforcements 11 of the first column 1 are inserted inside the steel pipe 20 of the second column 2 and anchored in filling concrete 21 infilled into the steel pipe 20. An inner peripheral surface of an end of the steel pile 20 is provided with a rib 23 which is protruded to the inside of the column and elongated along a circumferential direction of the steel pipe 20.