Abstract: A manhole cover is made of a fiberglass reinforced saucer-like shell that is filled with concrete. The interior surface of the shell is rough and the shell has a maximum thickness of 5 mm. An adhesive agent may be provided between the base and the filling, to obtain a reliable bond between base and filling. The concrete for the filling may be pure mineral concrete. One or more lifting handles are embedded in the filling. To this end, a recess for each handle is formed in the filling. The ends of the handle are embedded in the concrete and the lifting portion of the handle is curved upward and is held in the recess such that there is a space between the curved portion and the bottom of the recess, so that the handle may be easily grasped.

Abstract: With a wall element with lateral connection means to form an interconnection with an adjacent identical wall element, the invention proposes that the connection means are embodied as a row of tabs arranged one above the other, whereby the tabs are arranged at an angle with respect to the surface plane of the wall element at least in the area of their free lateral ends, and whereby the wall element has at both sides tabs embodied to correspond with one another such that the tabs of two adjacent identical wall elements can be inserted into one another in a zipper-like manner due to their oblique position and form an interconnection to absorb forces that are directed crosswise to the surface plane of the wall element.