Connection structure of tubular connection member and joint member

摘要

In a connection structure of a tubular connection member and a joint member according to an embodiment, a joint member (20) with a cap nut (30) mounted thereon is connected to a tubular connection member (12) with a spiral ridge (14) and a flange (16). The cap nut (30) has a spiral groove formed in the inner peripheral surface and includes a detent member (35) having a movable portion (36) and an extending portion (37). A spigot portion of the joint member (20) is inserted into the tubular connection member (12), and the cap nut (30) is screwed in. Then, the extending portion (37) of the detent member (35) is locked by a locking protrusion (162) provided on the flange (16) of the tubular connection member (12).