| 摘要 |
<p>PROBLEM TO BE SOLVED: To execute an RC-constructed external stair having profound appearance and high accuracy and high quality easily by using a precast tread. SOLUTION: The RC-constructed external stair A is built by using a plurality of units of precast treads 4, in which a precast tread 4 corresponding to a half stair, in which a stair landing section 1 on the building body side, a stair landing section 2 on the outside and a stair floor section 3 tying both stair landing sections are unified, is employed as one unit. A support 9a, on which cantilever beams supporting the stair landing sections on the building body side are installed, and a support 9b, on which the cantilever beams supporting the stair landing sections on the outside are set up, are disposed in upright at that time, and the precast treads 4 are constructed among the cantilever beams of both supports 9a, 9b while using these both supports 9a, 9b and the cantilever beams as temporary support materials. Cast-in-place concrete 5 is placed between both supports 9a, 9b under the state, in which the side face sections of the stair floor sections of the precast treads 4 are fixed, and a mainly mounted wall column 6 is built, and the precast treads 4 are supported by the wall column 6.</p> |
