PIPE FLANGE JOINT FOR STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a pipe flange joint for structure capable of reducing a weight while increasing a strength performance. SOLUTION: In this integral pipe flange joint for structure, flange outer surface parts 12ac and 12bc forming bolt bearing surface 13a parts and nut bearing surface 14a parts are raised from flange outer surfaces 12ad and 12bd parts near the seat surface parts. The raised portions including those portions other than the bearing surfaces 13a and 14a of a bolt 13 and a nut 14 are formed in an annular shape about a pipe axis. The wall thickness of a flange outer surface shoulder part is reduced less than that of a flanged portion. Thus, a fatigue strength performance of more than that of a conventional pipe flange joint for structure can be assured with a weight of equal to or less than that of the conventional pipe flange joint.