| 摘要 |
PROBLEM TO BE SOLVED: To provide an outdoor playground excellent in construction efficiency in the open, excellent in durability in the case it is used, capable of being used for a skate board play, dabbling or the like and safely playing without any anxiety. SOLUTION: The sunken outdoor playground is constituted of the approximately horizontal bottom and the side curvedly erected on the outside of the bottom, the bottom is formed of a concrete mortar layer cast on the bottom plate with impervious structure horizontally put on a supporting layer, the side is formed of a concrete mortar layer cast on a corrugated steel plate stretched on a supporting frame provided on a footing, and the circumferential edge section of the bottom plate is formed in the circumferential edge bottom plate having a vertical cut-off edge and, at the same time, the circumferential edge bottom plate is fixed on the footing of the side. |
