| 摘要 |
PROBLEM TO BE SOLVED: To prevent local deterioration with the passage of time by shaping the artificial lawn of a boundary portion between a sand area and an artificial lawn area on the surface of the ground so as to draw a curve with a specific radius, and making the artificial lawn enter the sand to eliminate the edge of the boundary portion. SOLUTION: Artificial lawn 1 is buried in the shape of drawing a curve in a sand part 4 in a boundary portion 5' between a sand area and an artificial lawn area on the surface of the ground. A sink-in shape may be a circular-arc, but preferably it may be a semi-circle or semi-ellipse. The volume occupancy rate of piles of the artificial lawn 1 is 1-15%. The radius R is 1 to 10 times, preferably 1 to 5 times as large as the thickness of the sand layer, or is preferably 10 to 200 cm, preferably 10 to 100 cm. A cushion material 2 is laid on the soil 3 of ground, and the artificial lawn 1 is laid. Thus, the edge of the boundary portion can be made smooth, local deterioration of the artificial lawn with the passage of time can be prevented, and also an accident such as false step and the irregular bound of a ball can be prevented.
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