An apparatus for pneumatically discharging concrete

E - Fixed Constructions – 02 – D

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103/45, 137/75

E02D 15/02 (2006.01) B28C 7/16 (2006.01) F04B 9/117 (2006.01) F04B 13/02 (2006.01) F04B 15/02 (2006.01)

Patent

CA 2000952

Abstract In an apparatus for pneumatically discharging concrete fed hydromechani- cally in a dense stream, using for the hydromechanical feed a concrete pump having a hydraulic drive comprising at least two cylinders with op- posed 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 (34-37) of the dosing means (43- 47; 60-70) is connected to the displacer circuit (31) and designed as a reciprocating piston drive (34) whose absorption amount corresponds to the displacement amount of the working pistons (27, 28) and is added in both directions to the displacement amount of each working piston (27, 28) (Fig. 1).

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