Abstract: A plant for producing a concrete body having a planar upper side, wherein a high surface quality is obtained. A concrete body is extruded from unset concrete and is provided with a groove profile at the upper side thereof by means of a profiling unit. By means of the profiling unit and depending on the comb-shaped profile thereof, the sand particles are separated according to size, wherein large sand particles are displaced from the surface area of the concrete body toward the inside, this being toward the interior of the concrete body. Only fine sand particles can pass the profile, whereby raised areas of the groove profile are formed, which are made of extremely fine-grained unset concrete. Subsequently, the upper side of the concrete body is leveled by means of a leveling unit, wherein the raised areas of the groove profile are crushed and the fine-grained unset concrete of the raised areas of the groove profile is distributed to form a cover layer.

Abstract: A paver has a chassis and a trailing floating screed which is articulated on the chassis by a pair of tension arms. The setting angle of the screed relative to the ground is capable of being adjusted via actuating cylinders. The screed includes at least one tamper bar that is movable in upward and downward directions by a drive and having a variable number of strokes. Further, the screed has a bottom-side smoothing plate. At least one sensor configured for measuring the setting angle is provided in the vicinity of the rear end of the screed. The sensor is connected to an associated controller which is capable of adjusting the number of strokes or stroke rate of the tamper bar in order to adjust the setting angle of the screed to a predetermined desired value.