This disclosure relates to an automatic concrete pump comprising a support structure, which is mounted on a vehicle, for a concrete distributing mast and at least two supporting jacks which are pivotably joined to the support structure via an articulated joint, each articulated joint comprising two support plates made from a solid material, each having a bearing bore and protruding in a forked manner at a lateral distance from each other over the edge of a defining wall of the support structure, and having a hinge bolt which traverses the bearing bores. According to this disclosure, the defining wall which faces the hinge bolt is further away from the axis of the hinge bolt in the central area between the bearing plates than in the edge areas thereof which are adjacent to the support plates.