Branch pipe forming apparatus, lid doubling as valve element, branch pipe forming apparatus with lid doubling as valve element, and branch pipe formation method

Abstract

The branch pipe forming apparatusincludes a first split memberand a second split member, which include split surfacesandalong a plane including an axial center X of the existing pipe W and an axial center Y of a branch pipe, and which are connected to each other in a sealed state by a fastening member B. An axial center Z of a tube partis located closer to the branch pipethan to the outer circumferential surface of an existing pipe W in a cutter accommodation space Sp. The first split memberand the second split memberare coupled to each other at respective coupling portions with respective coupling openings opposite to each other across the drilled hole Wa and the cutter accommodation space Sp and holding therebetween an end portionA of the branch pipein a sealed state.