| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the occurrence of unevenness in construction when burying a sleeve allowing the insertion of a drain branch pipe connected with various drainage systems into moisture-proof concrete. SOLUTION: The sleeve 9 is buried into moisture-proof concrete 41 on an inner side of an outer peripheral foundation 4. At this time, one end of the sleeve 9 is fixed to a void hole 4a in the outer peripheral foundation 4, and the other end thereof is opened on an upper face of the moisture-proof concrete 41. Since a stopper ring 91 capable of coming into contact with the outer peripheral foundation 4 is formed at a set position in one end part of the sleeve 9, a length of insertion of one end part of the sleeve 9 for the void hole 4a of the outer peripheral foundation 4 becomes constant. Consequently, it is possible to securely prevent unevenness of an opening position of the other end for the moisture-proof concrete 41 when constructing the sleeve 9.</p> |
