| 摘要 |
PURPOSE:To simplify execution and to reduce a construction period by placing dry mix concrete between retaining walls erected on both sides after the back- filling to place stepping stones having L-shaped sections formed of treads and risers together as a unit thereon, and piling them up. CONSTITUTION:Stepping stones 111-11n having L-shaped sections are formed of treads provided with having non-slip grooves on the surfaces and risers together as a unit. After that, dry mix concrete 10 is placed between retaining walls used for sheathing erected on both sides after the back-filling, and the stepping stones 11 are successively mounted thereon from the bottom to form stairs. According to the constitution, execution is simplified, and a construction period can be reduced. |
