PROBLEM TO BE SOLVED: To provide a lawn protection material including an upper frame and a lower frame which has vertical engagement means.SOLUTION: The lawn protection material includes a lower frame laid on a base, and the upper frame engaged onto the lower frame. The lower frame and the upper frame are formed each into a mesh shape, the intersectional points of the nets fit in each other when the upper and lower frames are vertically engaged with each other. The intersecting point of the lower frame is provided with a projection part projecting upward, and the upper end part of the projection part includes a protruding part at the center of which a slit is formed. The upper frame is made of flexible raw material, and the intersecting point of the upper frame is provided with a cylindrical part opened downward and closed at the upper part. The inner diameter of the cylindrical part is smaller than the outer diameter of the protruding part. When the projection part of the lower frame is inserted into the cylindrical part of the upper frame, the protruding part formed at the upper end of the projection part closes the slit thereof to ensure the engagement of the lower frame with the upper frame.COPYRIGHT: (C)2010,JPO&INPIT【課題】本発明は、上部枠と下部枠からなる芝生保護材における上下方向の契合手段の提案である。【解決手段】本発明は、基盤上に敷設される下部枠と下部枠上に契合される上部枠からなる芝生保護材にあって、下部枠と上部枠は共に網目状とされ、互いに上下に契合されるときその網目の交点が一致し、下部枠の交点には上方に突出する突状部が設けられ、その上端部は中心に割れ目を設けた膨張部とされ、上枠部は柔軟な素材で形成され、その交点には下方に開き上部で閉じた筒状部が設けられ、筒状部の内径は前記膨張部の外径より小さく、下部枠の突状部が上部枠の筒状部に挿入されるとき突状部上端に設けた膨張部がその割れ目を閉じることで下部枠と上部枠の契合を確実とする下部枠と上部枠が契合した芝生保護材である。【選択図】図4
