Abstract: In an apparatus for pneumatically discharging concrete fed hydromechanically in a dense stream, using for the hydromechanical feed a concrete pump having a hydraulic drive comprising at least two cylinders with opposed pistons, said pump having synchronization control by a displacer circuit conducting the working medium displaced by a piston, and having a dosing means for an additive serving as an accelerating agent, whose drive is connected to the hydraulic circuit of the concrete pump drive, the inventive proposal is that the drive of the dosing means is connected to the displacer circuit and designed as a reciprocating piston drive whose absorption amount corresponds to the displacement amount of the working pistons and is added in both directions to the displacement amount of each working piston.

Abstract: Apparatus for distributing concrete comprises a jib rotatably mounted on a tower, with a conveyor pipe line mounted on the end thereof so as to be movable about horizontal and vertical axes. The pipe line is formed in several sections which are connected one below the other by pivotal joints with horizontal axes.