Watertightness testing method and assembling device

Abstract

A watertightness testing method for testing watertightness of a joined section () where one end section of a second pipe () is joined to a first pipe (), the watertightness testing method including: inserting a testing device body () into the first pipe (); attaching an assembling device () to another end section of the second pipe (); attaching a pulling device () to the assembling device () and connecting the pulling device () to a strap-shaped member () having been wound in advance around an outer circumference of the first pipe (); operating the pulling device () and pulling the strap-shaped member () in a separating direction of the second pipe () to have a reaction force generated in the second pipe () cause the second pipe () to be pulled in a joining direction (G), the one end section of the second pipe () to be inserted into the first pipe (), and the second pipe () to be joined to the first pipe (); and operating a moving operation rod () provided in the testing device body () from outside of the other end section of the second pipe () in a state where the second pipe () is being pulled in the joining direction (G) to move the testing device body () to the joined section ().