| 摘要 |
PURPOSE:To prevent the movement of sand by laying combinations of a body block consisting of upper, lower, left and right-handed wings, a vertical block to be connected with the body block in a half-placing manner by vertical axis, and a lateral block to be connected with the body block in a half-placing manner. CONSTITUTION:For a body block A, the ratio between the width and the height of upper and lower wins 1 and 2 is set to 2:1, the width of left and right-handed wings 3 and 4 is equalized with that of upper and lower wings 1 and 2, and the ratio between the width and the height is set to 1:1. Through holes 6, 8, 15, and 18 are drilled in the wings 1-4. The body block A is placed in a half- placing manner by the vertical axis to form a vertical block B, and the block A is placed in a half-placing manner by the horizontal axis to form a lateral block C. The wings of the blocks A, B, and C are combined with each other and placed, and cobble stones D are packed into the through holes.
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