| 摘要 |
A prefabricated stairway is provided to make covering the bottom surface of the stairway unnecessary to form the stairs bottom surface into the flat plane. In a prefabricated stairway, the outer portion of the transverse section is the triangle structure. Plural stairs sets consisting of a floor mat(21), an kicking plate and an inclined plate is plane-formed. A stair unit is assembled between a pair of stairs lateral panel by a combining means. The bent form of stairs bottom surface is not exposed outside. The total surface of the stairs bottom is formed into the flat plane. |
