| 摘要 |
<p>PROBLEM TO BE SOLVED: To restrain the risk of damaging a wall part when a stair zone is constructed with the use of a stair unit which has been previously integrally formed between opposed wall parts, and simplify the work at a job-site. SOLUTION: In a zone where a first wall part, a second wall part 14 and a third wall part 16 are planted in a U-like pattern around a stair installation zone, a support wall part 40 is planted on a floor surface part 80 below the stair. Further, one of side parts of a first stair unit 50 is made into contact with the first wall part so as to arrange the first stair unit 50 extending from the floor part 80 to the support wall part 50. Then, a landing 70 is constructed in a zone which is off from the first stair unit 50 toward the second wall part 14, and between the first wall part and the third wall part 16. Next, the other side part of the first stair unit 50 is brought into contact with the associated wall surface, and an intermediate wall part 50 is planted on the floor surface 80 in parallel with the first wall part and the second wall part 16. Thereafter, one and the other of side parts of a second stair unit 60 are brought into contact with the third wall part 16 and the intermediate wall part 30, respectively, and the second stair unit 60 is arranged extending between the landing 70 and the floor surface part 80.</p> |
