FIELD: mining industry. SUBSTANCE: support comprises tubings with concentric walls 1 interconnected by ribs and overlapped by bends 3. Cast-iron walls 1 have through plugging holes 5 whose centers are disposed at equal distances from tubbing angles on a line passing through opposite angles of the tubbing. The number of holes is equal to that of ribs. Gaps between walls 1 and those between external surface of wall and rock are filled with concrete. EFFECT: improved design. 3 dwg
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