FIELD: civil engineering. SUBSTANCE: wall block has trapezoidal cavities 1 and 2, slot 9 on lower end face, corresponding ridge 7 on upper end face, slot 5 and ridge 3 on side edges. The block has semicircular hollows on end faces 4, 6 and on upper edge 8. Base of trapezoidal cavity 2 is located above lower point of semicircular hollow 8 and overlaps the base of semicircular hollows 4, 6. EFFECT: improved design. 2 cl, 4 dwg
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