| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide penetration structure of a concrete fire-proof partition board part of facility piping or the like and a partition holding bush capable of performing renewing of facility piping penetrating the concrete fire-proof partition board part in a short period without breaking the concrete. <P>SOLUTION: A through-hole 7 inserting the equipment piping 5 into the concrete fire-proof partition wall 1 is provided, a partition holding bush 18 having elasticity is detachably provided in the through-hole 7, and the equipment piping 5 is inserted in the partition holding bush 18. <P>COPYRIGHT: (C)2004,JPO</p> |
