The water inlet convex portion of a circular shape is located at the central portion of the upper surface of the assembly in which the torus of the first layer is equally divided, and the water inlet convex portion has a taper of 1° that decreases in diameter as it goes upward, and the water inflow. A circular water inlet pipe is formed at a central portion of the convex portion, and a side coupling convex portion is formed on one side of the side surface of the assembly in which the torus is equally divided, and a side coupling concave portion is formed on the other side, The side coupling convex portion also has a taper of 1° that decreases in diameter as it goes outward, and an outer diameter portion is formed outside and between the side coupling convex portion and the side coupling concave portion, and an inner diameter portion is formed inside. An irrigation hole is located under the outer diameter portion, and the lower surface of the assembly in which the torus is divided into equal parts is formed flat, and the lower surface has a fixed portion formed toward the center of the outer diameter part. A one-layer assembly that equally divides the torus； The structure is similar to the one-layer assembly, but there is no irrigation hole and a fixed part, and the lower surface is flat, and the upper layer is a quadrant of the upper portion of the torus, characterized by having a concave circular water discharge concave portion in the central portion of the lower surface. Assembly； An irrigation stopper used to block an irrigation hole located under the outer diameter portion and the inner diameter portion of the one-layer assembly； It is composed of a circular water inlet pipe cover that blocks the circular water inlet convex portion formed on the upper surface of the one-layer assembly. Water is also communicated to the side by the combination of the side coupling convex portion and the side coupling concave portion of the assembly of the torus protection tree as
