| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a duct sleeve capable of preventing coming-off even when a handhole shrinks. <P>SOLUTION: A duct sleeve 1 is penetrated through a lateral wall 100a of a handhole 100 and is integrated. In the duct sleeve 1, a rib 6 is provided on an outer surface 3a of a small diameter part 3. Height 6h of the rib 6 is set higher than height Sh of a clearance S generated between the lateral wall 100a and the outer surface 3a of the duct sleeve 1 due to drying shrinkage of concrete during construction of the handhole 100. <P>COPYRIGHT: (C)2012,JPO&INPIT |
