| 摘要 |
A branch device for noninterruptive flow boring suitable for connecting b ranch piping with an existing pipe (1) by partially boring the pipe wall (12 ) of the existing pipe (1) using a boring machine (3) equipped with a hole s aw (4) and forming an opening (11) in the pipe wall (12) comprises a plurali ty of cases (21, 22) split in the circumferential direction R of the existin g pipe (1), an enclosed case (20) formed integrally with the first split cas e (21) out of the plurality of split cases (21, 22) and having a pipe portio n (27) projecting in the radial direction C of the existing pipe (1) and bra nching, a valve element (5) having an arcuate or circular cross-section and opening/closing the opening (28) of the branch pipe portion (27) by rotating along the circumferential direction R of the existing pipe (1) between the inner circumferential surface (29) of the split case (20) and the outer circ umferential surface (13) of the existing pipe (1), and a mechanism (50) for rotating the valve element (5). |
