Verfahren zum Anschluss eines Abzweigrohrs

摘要

A method of connecting a branch pipe (B) to an existing main pipe (A) is disclosed. The method includes the steps of: connecting and communicating a branch-pipe joint having a branching pipe portion to an existing main pipe (A); connecting a branch pipe to the branch-pipe joint; and communicating the branch pipe with the existing main pipe through the branch-pipe joint, with all these steps being effected while outflow of fluid from inside the main pipe being prevented. In the above method, the branch pipe (B) is connected with a connecting pipe portion (E) which in turn is connected with the branching pipe portion (4) via a flange joint (6) including a pair of flanges. A shutter plate (8) is inserted between the pair of flanges of the flange joint (6) and communicating the connecting pipe portion (E) with the branching pipe portion (4) thus preventing outflow of the fluid from the branching pipe portion. The flange joint (6) is loosened while the connecting pipe portion is kept connected with the branch pipe so as to withdraw the shutter plate (8) from between the flanges to allow communication between the branch pipe and the branching pipe portion. The flange joint is then tightened and the connecting pipe portion the branching pipe portion are connected and communicated with each other.