| 摘要 |
<p>PROBLEM TO BE SOLVED: To save weight of an integrally molded concrete staircase.SOLUTION: A staircase is not integrally molded but divided into footstools and each footstool is U-shaped excluding front, back and bottom faces of a parallel hexahedron of a rectangle so as to save weight of the staircase. A shorter footstool is made narrower and deeper than a taller footstool. The plurality of footstools having different heights are disposed side by side in a staircase shape and placed in such a manner that the back side of the shorter footstool gets through under the taller footstool. The footstool is made of concrete. Therefore, even when a person gets thereon, the footstools are prevented from moving by the weights thereof and stabilized, such that the footstools are not integrated but kept thus placed to be utilized as a staircase.</p> |
