| 摘要 |
PURPOSE:To effectively use an underground space by elimination of columns, by providing a plurality of supporting members and beams to make the same plane height in the periphery of a reversed conical space in the underground and attaching a stairs from the respective floors up to the ground level. CONSTITUTION:The ground is directly excavated downward and a vertical stairs is attached on the peripheral wall. And the upper end 30a of the stairs 30 is connected to the ground level and the lower side 30b of the stairs 30 is connected to respective floor plates 20. In this way, the stairs 30 is connected to respective floors and also connect respective floors with the ground level. And further, the stairs 30 is used for emergency to easily escape from respective floors to the ground level so as to be useful for safety. |
