| 摘要 |
PROBLEM TO BE SOLVED: To suitably construct stairs in a building.SOLUTION: A building 10 is provided with stairs 16 having a plurality of stepboards 17. The plurality of stepboards 17 include a top rail 17a being the stepboard 17 of the uppermost stage and a lower side stepboard 17c being the stepboard 17 of a second stage from above. The top rail 17a is placed on a floor girder of a second floor part 13 via a floor joist. The top tail 17a is attached with a riser 18a extending downward from this top rail 17a. This riser 18a is arranged on the stairs innermost side of the lower side stepboard 17c, and is superposed on an end surface of its lower side stepboard 17c. A riser backing is installed on a reverse surface of the riser 18a, and a stepping backing is installed on an under surface of the lower side stepboard 17c. The riser 18a is driven in the riser backing by penetrating a machine screw through the stepping backing, the lower side stepboard 17c and the riser 18a, and is thereby fixed to the lower side stepboard 17c. |
