| 摘要 |
<p>Disclosed are a stair unit structure, a precast stairway system and a method for constructing such a precast stairway system using one or more stair unit structures. The stair unit structure is formed in a one-piece structure by at least one stair with a riser and a tread, which has a post- cure strength of 60 to 200Mpa. The precast stairway system includes a stairway formed by connecting stair unit structures one after another and two inclined stringers, and has a high or ultra-high strength, but is still excellent in endurance and load carrying capacity due to its relatively superior flexible behavior as compared with an existing high strength concrete. The precast stairway system also exhibits excellent water-tightness and excellent noise-reducing performance as to walking load. In the method for constructing a stairway, one or both stringers may serve as molds in a position where they can be fixed within a wall body to be constructed, thereby forming a floor landing, and an intermediate landing integrally and simultaneously with the wall body. Accordingly, not only the precast stairway can serve as a working passageway, but also the wall body can support the load of one or both inclined stringers in the course of construction, as a result of which labor cost curtailment, construction cost curtailment owing to short construction period, manufacture/transport cost curtailment, and the shortening of construction time can be promoted.</p> |
