| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete filled steel pipe structure capable of preventing cracking and reducing the pipe thickness of a steel pipe while reducing labor in construction.SOLUTION: A concrete filled steel pipe structure 1 of this invention comprises a column 10 formed by filling the inside of a steel pipe 11 with concrete 12 and a reinforced-concrete 30 is installed in a part of the periphery of the column 10. In the concrete filled steel pipe structure 1, an extension part 16b of the lower side in the column 10 where the reinforced-concrete 30 is installed has a circular cross-sectional shape and a column 15 of the upper side in the column 10 where the reinforced-concrete 30 is not installed has a quadrangular cross-sectional shape, and a circular area E with a circular cross-sectional shape is positioned below a quadrangular area S with a quadrangular cross-sectional shape.SELECTED DRAWING: Figure 1 |
