| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique of placing a new pipe being driven into an existing pipeline for actualizing short and inexpensive placing work without giving ill effects to a flow in a new pipeline after placed. SOLUTION: This pipeline placing method for placing the new pipe being driven into the existing pipeline 24 having a straight pipe portion and a bent pipe portion comprises connecting short pipes 15 each other, located before and behind the straight pipe portion of the existing pipeline 24, with a bolt 22 fitted to flange portions 15c formed on the inner faces of the short pipes 15, transmitting the driving force of the pipeline, when placed, between the short pipes 15 via the flange portions 15c and bolt 22, removing the bolt 22 when the short pipes 15 reach the bent pipe portion 24b of the existing pipeline 24, mutually centering the short pipes 15 located before and behind the bent pipe portion 24b, joining the short pipes 15 to each other with welding to form a bent pipe portion of the new pipeline, and removing the flange portions 15c of the short pipes 15. COPYRIGHT: (C)2006,JPO&NCIPI
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