| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To make it possible to lessen breakage by deformation or the like of an irregular shape tube of a buried pipe line which receives soil pressure or the weight of a passing vehicle and to easily connect the irregular shape tube. <P>SOLUTION: In the irregular shape tube 1 including a branch pipe 1b attached to a side surface of a main pipe 1a in a watertight manner so that the branch pipe and the main pipe 1a communicate with each other, strip-like reinforcement sheets 5 are adhered to extend at least from an outer surface of the branch pipe 1b toward an outer surface of the main pipe 1a. On the side of the branch pipe 1b, the reinforcement sheets 5 extend in the axial direction and are arrayed in parallel with one another in the circumference. On the outer surface of the main pipe 1a, the sheets 5 extend radially around the branch pipe 1b. Bending lines 6 of the sheets 5 are arranged at a connecting portion between the main pipe 1a and the branch pipe 1b. Further, belt-like tape members 7, 8 are circumferentially wound over the strip-like reinforcement sheets 5 extending on the outer surface of the branch pipe 1b and the strip-like reinforcement sheets 5 extending on the outer surface of the main pipe 1a, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
