| 摘要 |
PROBLEM TO BE SOLVED: To enable an open hole of a fire compartment to be appropriately closed at the time of fire even if an additional outer member formed by thermal expansion material is not applied.SOLUTION: A double layer structure pipe 10 is a synthetic resin pipe having double layer structure of an outer layer 12 and an inner layer 14, and is installed in an open hole 102 of a fire compartment 100 of a building. The inner layer 14 of the double layer structure pipe 10 is formed by expanding and forming a diameter of the pipe of synthetic resin. That is, the inner layer 14 is applied with a feature that application of heat more than a shape memory temperature causes the pipe to be shrunk in a circumferential direction. At the time of occurrence of fire, the inner layer 14 is separated from the outer layer 12 while a part of the inner layer is being carbonized and the diameter thereof is reduced to cause the open hole 102 to be closed. |
