To effectively utilize a place on natural lawns by providing the natural lawns movably mounted on trucks and an athletic field where artificial lawns are laid, carrying the trucks of the natural lawns onto the laid surface of the artificial lawns and covering the artificial lawns with the natural lawns.
The natural lawns 1 of an outdoor athletic field A are divided into plural sections and planted on the trucks 7 for respective divisions and players play sports on the natural lawns 1 on the trucks 7. Then, the respective trucks 7 are mounted on rails laid inside the outdoor athletic field A. In the case of moving the natural lawns 1 on the trucks laid on the outdoor athletic field A to an indoor athletic field B where the artificial lawns 2 are laid, they are moved along the rails 3 of the indoor athletic field B by a tow truck for instance. In the indoor athletic field B, for instance, the rails 3 are exposed by removing a cover covering the rails 3 and the trucks 7 on which the natural lawns 1 are mounted are moved there. In such a manner, by moving all the trucks 7 of the natural lawns 1 onto the surface of the artificial lawns 2 and orderly arranging them, the entire surface of the artificial lawns 2 is covered with the natural lawns 1.
TAMURA YOSHIHIKO
NAITO MASAMITSU
