| 摘要 |
PROBLEM TO BE SOLVED: To provide a temporary passageway to be used in areas such as a worksite for removing asbestos or a workplace that needs measures to stop the spread of dust pollution, and a zone polluted with a toxic gas or bacteria, which is designed for work requiring complete isolation from outside, can be disposed of after use, produced at a low cost, and stored in a smaller space. SOLUTION: Tunnel in which a framework of a tunnel (2) constituted by shaping metal pipes helically extend inside the long cylindrical sheet (1) and is isolated from the outside are formed in series in a long cylindrical sheet (1) made of vinyl chloride or polyethylene that can be cut off or added according to the distance. As for step portions such as stairs, a helical framework (4), exclusively used for stairs, is applied in which vertically slidable cylindrical hinges (4a) and (4b) slide the vertical directional framework and the frame stand itself according to the height and depth of the steps is used. When the sheet tunnel is removed after use, the helical frameworks (2) and (4) are disassembled and removed one by one, and lastly the long cylindrical sheet (1) is disposed of. COPYRIGHT: (C)2007,JPO&INPIT
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