| 摘要 |
PROBLEM TO BE SOLVED: To provide a pipe unit for bypassing an obstacle capable of providing highly reliable piping at a free angle and assembling a high earthquake-proof pipe with less man-hour and low construction cost when the pipe bypasses the obstacle such as a manhole when the pipe is buried in a ground. SOLUTION: This pipe unit for bypassing an obstacle comprises one deformed pipe 1 with a flexible part and three deformed pipes 2 both having short and long effective lengths of the same dimensions. The flexible part 1a comprises an insertion part 3a having a spherically-shaped outline, a packing groove 4c, a packaging body part 4e having an extraction preventive groove 4d, a packing 5, an extraction stopper 6, and a ring 16. A pipe material is a ductile cast iron.
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