The purpose of this ancient case is to prevent the collapse of the mountain slope and the loss of soil and sand, improve the solid fixation and excellent drainage effect, but not the landscape black on the mountain slope.The hillside surface (4) connects most of black (2) into four corners. During construction,A block (2) is formed by separating the guide (22) on both sides of the drainage Road (21) while forming a road (21) with the upper layer.At the two ends of geblake (2), a narrow geosyncline (31) and a isthmus Chin (32) are formed around the narrow passage,The central part is connected with the drainage channel (21) of black (2), which is connected with the drainage channel (33).A hole (34) is formed in the center, and a hillside surface (4) is formed by installing nails (5), and a hillside surface characterized by a fixed tray (3).
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