| 摘要 |
PURPOSE: A device for maintaining the inside a common duct is provided to prevent a water leak occurred in a joint gap between pipes and to minimize deformation. CONSTITUTION: A device(10) for maintaining the inside a common duct comprises an expansion member(20), fixing members(30), exterior members(40), springs(50), and finishing plates(60). The expansion member is installed in a joint between pipes. The fixing members are installed in both sides of the expansion member. The exterior members are installed on the outer surface of the expansion member and leave intervals between them. The springs are installed between the expansion member and the exterior members. The finishing plates are installed in both sides of the fixing members. |
