| 摘要 |
A metal pipe coupling (1) has a sleeve (2a) having, at one end thereof, an insertion hole having a circular cylindrical surface (a1) into which an end of a metal pipe (4) is inserted, a flange (2b) formed at the other end of the sleeve (2a), and a doughnut portion (2d) extending radially inwardly from the deepest position in the direction of the central axis. The doughnut portion (2d) has an annular surface (a2) having a width corresponding to the wall thickness of the metal pipe (4), and the side surface of the metal pipe (4) makes contact with the annular surface (a2) when the metal pipe (4) is inserted into the sleeve. The circular cylindrical surface (a1) and the outer peripheral surface of the metal pipe (4) are bonded to each other by an adhesive agent. Metal pipe couplings (1) are coupled to each other by bolts (5a) and nuts (5b) busing bolt holes (3a) provided in flanges (3). |
