| 摘要 |
PROBLEM TO BE SOLVED: To provide ring steel for a building structure, which can achieve a weight reduction while maintaining a welding strength. SOLUTION: The ring steel 1 for the building structure includes a welding storage part 20 and welding holes 1c. The welding storage part 20 is formed between the inner peripheral part 1a and the outer peripheral part 1b as a groove which has a concave cross section and is shaped like a ring. The welding holes 1c are formed on the undersurface 20a of the welding storage part 20 at regular spacings. As a result of the formation of the ring-shaped welding storage part 20, ring-shaped flanges 21, 22 are formed between the welding storage part 20 and the inner peripheral part 1a and between the welding storage part 20 and the outer peripheral part 1b respectively from the outward appearances of the ring steel 1. Then the circumference of the excess metal part B of a welded part 3 which has been plug-welded in the welding hole 1c reaches the undersurface 20a of the welding storage part 20. COPYRIGHT: (C)2011,JPO&INPIT |
