The present invention has an outer frame walls, the inner frame wall, and an outer frame portion having a double wall having a tread surface that connects them (2), on each outer surface of the outer frame portion, two adjacent at least one coupling device (6, 8) is provided for connecting the tissue components that; if necessary, the inner cell-like lead-through of the outer frame formed by the outer frame section (2) (6 ) pattern on the inner wall which divides (4); internal bottom support frame (11); if necessary, at least one filling body is introduced into a plastic multipurpose unit stabilized, as a means for supporting, double bottom horizontal strut on the inner frame and outer frame walls, having, suitable as building block for the sheet-like assembly, are filled with a filling material, to the plastic multipurpose tissue components.
.FIELD 1