Abstract: Joining connections are presented for joining the functional parts of hydraulic or pneumatic operating devices the joining connections including a first part exhibiting an external wall section and a second part exhibiting an internal wall section, which are joined together with mutually overlapping wall sections having depressions that form a cavity, in the connected state that is filled with a fluid casting compound of plastic that connects the two parts together by means of a positive form fit after hardening to prevent relative displacements between the two functional parts and to seal the separating gap clearance between the wall sections of the two functional parts.

Abstract: The invention relates to a method for joining the functional parts of hydraulic or pneumatic operating devices, such as hydraulic props and rams for underground mining, with a first part exhibiting an external wall section and a second part exhibiting an internal wall section, which are joined together with mutually overlapping wall sections and in this region are connected together, as well as the joining connection for corresponding functional parts. In accordance with the invention both wall sections comprise a depression, which in the connected state form a cavity that is filled with a fluid casting compound of plastic, which after its hardening or solidification connects the two parts together by means of a positive form fit.