| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint structure of steel pipe for column member capable of maintaining various advantages of a type adopting a thick-walled short steel pipe, forming a groove part for welding inexpensively by shortening manufacturing time, and performing connection work by welding more smoothly than in a conventional structure. SOLUTION: This joint structure is composed of a long steel pipe 1 having predetermined plate thickness t and the short steel pipe 2 having larger plate thickness T than that of the long steel pipe 1. The long steel pipe 1 is formed by cold forming and the short steel pipe 2 is formed by hot forming to form peripheral shapes W, R of the long steel pipe 1 and the short steel pipe 2 into the same shape. Both steel pipes 1, 2 are mutually connected by welding 5 from an outer side while an end face 1b of the long steel pipe 1 opposes to an end face 2b of the short steel pipe 2 in which a groove is not formed. Consequently, the steel pipe for the column member maintaining various advantages of the type adopting the thick-walled short steel pipe is constituted. The welding connection work can be smoothly, efficiently, and properly performed always while a step part (irregularity) does not occur because their peripheral shapes are the same, and stress can be favorably transmitted. The thick-walled short pipe can be inexpensively formed by shortening the manufacturing time because the groove is not formed. The long steel pipe can be inexpensively formed by cold forming. COPYRIGHT: (C)2004,JPO
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