WALL BLACK Russian patent published in 1997 - IPC

FIELD: civil engineering. SUBSTANCE: wall black includes parallel walls interconnected by perpendicular partitions. Partition height is 0.3-1.2 of wall heights. The distance between outer vertical faces of partitions and end faces of walls are equal to or more than 0.5 partition thickness and equal to or less than 0.25 wall length. The distance between slots and ledges, and the distance between the ledges and vertical end faces of black walls are less or more than thickness of appropriate partitions and walls in the point of slot. The distance between crosswise planes of wall symmetry and slot centers are equal to distances between wall end faces and centers of appropriate ledges. Black walls may not have crosswise symmetry planes. Right and left slots, ledges and partitions are placed at different distances from wall centers, and the distance between wall centers and centers of right or left end faces are equal to distances from appropriate right or left end faces of walls to centers of appropriate ledges. Block is symmetric about the central vertical lengthwise plane. Walls may be made in the form of two, three or more plates, shifted up or down, right or left about each other or along wall diagonal to form slots and ledges as a result of the shift. Walls, partitions, slots, ledges may has similar or different dimensions, shapes, arrangement, number. EFFECT: optimized design. 25 cl, 57 dwg