CONCRETE ENCASED COLUMN BASE FOR STEEL PIPE COLUMN

PROBLEM TO BE SOLVED: To provide an economical well-settled concrete encased column base for reducing manufacturing cost in the case where a closed section material such as a steel pipe is used as a column in a building having a steel frame column. SOLUTION: The steel pipe column base of a steel frame structure is composed of a steel pipe column 10 fixed to a foundation B through a base plate 11 drilledly provided with a hole 11a at a central part; a reinforcing steel member 20 fixed to the foundation B so as to be accommodated in the inner cavity of the steel pipe column 10 and the hole 11a drilled in the base plate 11; concrete 30 placed in the inner cavity of the steel pipe column 10; and a structure body 40 which is made of reinforced concrete and provided on the periphery of the leg part of the steel pipe column 10. In addition, a concrete filling hole 10a is drilledly provided on the upper side of the column base of the steel pipe column 10.