| 摘要 |
An underground construction comprises, a circumference wall forming therein a cone shape space; a plural support members being located at circumference of the cone shape space in vertically the same height; floor construction bodies each having a plural bed beams and a floor portion, an end of each bed beams being supported by the support members; the floor portions being disposed in the middle of the cone shape space with a fixed interval from the circumference wall. No piller for supporting floor construction bodies such as a roof, a floor or the like is needed. |
