| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a device for closing a collecting sewer excellent in workability.SOLUTION: A diameter enlargement implement 19 comprises a cylindrical body 21, and a pair of rubber expansion sleeves 23 and 23 that are provided on both lengthwise-direction sides of the outer periphery of the body 21, respectively. A lengthwise-direction central part of the body 21 is provided with a filler supply hole in advance. Additionally, an injection holder 37 is formed by winding a metal thin-walled plate 41 in a cylindrical roll shape in such a manner that an overlap part 39 is formed. The injection holder 37 is mounted on the outer peripheries of the expansion sleeves 23 and 23 to constitute a closing device.</p> |
