A module of cover is a plastic plate in rectangular form with grate upper surface, support elements attached from beneath to frame upper surface of plastic plate and elements for connection to other plastic plates placed at the side surfaces of the plate. The plastic plate is arranged as square sections with grate upper surface formed with triangular openings. Square sections of plastic plate are placed one with respect to another with constant gap and are connected to each other by means of U-shaped link beams that have supports in the lower part. Facets of the grate upper surface of the plastic plate are arranged as corrugated.
