Abstract: The disclosure relates to a hollow rod shear connector for stabilizing rock layers in mining, tunnel construction, civil engineering and rock construction, at least having a connector base with one or more outlet channels and a hollow rod which can be fastened to the connector base and comprises a static mixing apparatus adjoining the connector base, a cartridge, divided by a partition into two compartments, for receiving chemical fastening means, and a two-part plunger corresponding to the compartment division, wherein the static mixing apparatus consists of a plurality of mixing elements one behind the other, wherein the flow direction of the chemical fastening means is changed by greater than or equal to 150° and less than or equal to 210° at least twice along the static mixing apparatus. The present disclosure also relates to a method for setting a hollow rod shear connector in a rock layer.

Abstract: The disclosure relates to a hollow rod composite anchor for stabilizing rock strata in mining, tunnel construction, underground construction, and rock construction, at least having an anchor base with one or more outlet channels, a hollow rod which is arranged behind the anchor base and contains a static mixing device and an adhesive cartridge with a press-out piston, said adhesive cartridge being arranged on the static mixing device via a cylindrical seal device with at least one bursting surface, wherein the outer diameter of the seal device substantially corresponds to the inner diameter of the hollow rod, the area of the bursting surface is greater than or equal to 15% and less than or equal to 90% of the cylinder cross-section of the seal device, and the ratio of the area of the bursting surface to the area of the hollow rod wall cross-section is greater than or equal to 0.1 and less than or equal to 25. The disclosure additionally relates to an improved method for setting hollow rod composite anchors.

Abstract: According to the invention, a drill rod comprising an inner channel is drilled into the rock. A free-flowing, self-hardening mass is pressed through the inner channel of the drill rod, filling the drilled hole, so that it hardens with the drill rod remaining in the drilled hole. The hardening mass is a mixture of a hardenable plastic and a hardening plastic. Said plastics are supplied to the inner channel of the drill rod over a pre-determined transport time F which corresponds to the hardening time. The hardening time is defined by the selection of the plastics and the mixing ratio thereof such that the transport time essentially corresponds to the hardening time and leads essentially to the flow path of the hardened mixture being completely filled between the mixing point and the output of the drilled hole.

Abstract: A device for the extrusion of two component or two-part synthetic resins, in particular in underground mining and tunnel construction, which essentially consists of an extrusion pump in the form of an axial piston pump, exhibiting or having two pump stages or steps, located in a transportable frame, whereby each pump stage or step is connectable to reservoirs containing the synthetic resin components or parts via hose lines.