PROBLEM TO BE SOLVED: To provide a highly strong part in a tunnel shape at part of a building and escape through it at the time of building collapse due to an earthquake or the like. ;SOLUTION: This is a tunnel which is made up by combining plural frames 1 with plural beams 2 and affixing slabs to the top and the bottom, and is provided by penetrating a room wall, and doors are provided at the parts of the wall and the tunnel inside. At the time of emergency, the inside and outside of the room are made through by opening the doors, or at the time of an earthquake, a floor under a bedding is opened downward, and the lower part becomes a tunnel passing under the floor.;COPYRIGHT: (C)1997,JPO
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