| 摘要 |
PURPOSE:To improve workability, by forming lower and upper straight stairway units with left and right side boards and by providing upper and lower landing units with a level difference, at the place between above-mentioned units. CONSTITUTION:A lower straight stairway unit 2 and an upper straight stairway unit 7 are respectively formed putting a plurality of step boards 23, 73 in parallel with each other, between left and right side boards 21, 71. A lower landing unit 3 made lower than the following by one step and an upper landing unit 4 are respectively formed putting plane boards 35, 45 on frameworks 31, 41. Furthermore, a partition wall unit 6 is fastened to the side of the lower straight stairway unit 2 and the floor surface of the lower floor, and the upper straight stairway unit 7 is fastened to the upper landing unit 4, the partition wall unit 6 and the floor surface of the upper floor. Therefore, their arrangement is made satisfactory at the inside of a house and a term of work can be shortened. |
