FIELD: construction.
SUBSTANCE: lining element includes upper and lower surfaces, as well as one or more drainage channels passing through lining element between upper and lower surfaces. Drain channels comprise mainly concave upper part or upper part with recess, provided on upper surface of lining element, and channel from concave part extending from lower surface of lower part of lining element. Drain channels can be full-sized if lining element is arranged in inner part, or partial, if lining element is arranged on sides or along perimeter. Partial channels are full-sized, when lining element is located tightly to another element when forming lining.
EFFECT: drain channels are intended for channel cleaning.
16 cl, 46 dwg
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