Abstract: An apparatus for mixing a powdery medium with a fluid includes a mixing vessel which can be filled with the fluid and which has a feed for the fluid, an inlet for the powdery medium and an outlet for the fluid mixed with the powdery medium, and at least one mixing screw arranged inside the mixing vessel and driven by a rotary drive.

Abstract: A rod assembly for a device for trenchless rehabilitation of pipelines includes at least two rod sections connectable to one another by a plug connection in a tension-proof manner, with at least a first one of the rod sections having an end formed with a lateral opening, and a second one of the rod sections having an end formed with a crosspiece for insertion in the lateral opening of the first rod section. Those end faces of the lateral opening and the crosspiece which are pressed against one another in response to a tensile load of the rod assembly have an arched configuration.

Abstract: A connection mechanism has a drive section with a thread on one end and is constructed as a sleeve. A shaft element having a thread matching the thread of the drive section can be screwed together with the drive section. At least one interlocking element forming an interlock with the sleeve is provided in addition to the thread.

Abstract: A threaded plug for a threaded connection includes a core having an exterior thread. At least one flank of the exterior thread forms a segment of an ellipse, wherein the segment of the ellipse extends continuously from a root of the thread to a corresponding crest of the thread. A threaded connection can be formed by combining the threaded plug with a threaded bushing having an interior thread constructed to engage with the exterior thread of the threaded plug.

Abstract: The invention relates to a method for inserting a pipe (4) via a pit (1) into an underground borehole, wherein the pipe is flattened before entering the pit, and wherein the pipe is redirected within the pit in the direction of the axis of the borehole, so as to re-deform the pipe before entering the borehole.

Abstract: The invention relates to a ram boring device for creating horizontal boreholes, having an impact piston which moves in an oscillatory manner within a casing of the ram boring device and of which the impact frequency or impact intensity can be varied by displacing the center position of the impact piston inside the casing.

Abstract: An earth boring apparatus includes a drill rod, a source for a drill fluid, and a voltage source. The drill rod has a hollow rod casing provided for throughflow of the drill fluid, and a conductor located within the rod casing, with the voltage source being connected with the conductor and the rod casing. The voltage source is so connected as to prevent the electric conductor to act as anode in the event the drill fluid establishes an electrically conductive connection between the rod casing and the conductor.

Abstract: The invention relates to a system for the overground operation of underground sewer tools, especially of expander and pulling heads comprising a rod assembly that is rigid when pushed and a supporting device absorbing shear or tractive forces.

Abstract: The invention relates to a coupling system for rod segments for use in horizontal earth boring, wherein the ends of the rod segments are interlinked via a separate sacrificial element which can be used as a predetermined breaking point or which allows the rod segments to be pivoted relative each other.

Abstract: The invention relates to an apparatus for inserting a new pipe into an old pipe by means of a self-driven impact device, which simplifies the insertion of a new pipe into an old pipe, and wherein blocking elements of an apparatus according to the invention engage with the inside wall of an old pipe in order to prevent any movement of the self-driven impact device in a direction opposite the direction of advance, as well as a method for using the device. The apparatus according to the invention has blocking elements, which are disposed on at least one base body, but preferably four base bodies, which are in turn releasably mounted on the self-driven impact device. This method is characterized in that the base bodies together with the blocking elements and the self-driven impact device are salvaged by the new pipe.

Abstract: The invention relates to a rod magazine for a drilling device with separating elements whose position is variable, a system, and a drilling device.

Abstract: The invention relates to a tool for longitudinally subdividing buried sewer pipes having an asymmetric, generally oval cross section, made substantially of a support shoe opposing a cutting blade acting in the direction of the pipe axis. The device also has two side cutting blades and is moved through the old pipe by means of a rod and a cylindrical calibration mandrel.

Abstract: A transmitter housing for a drilling device having a drilling fluid feed line comprises a collector space formed in the interior of the transmitter housing for accommodating a pressure sensor of a locating probe.

Abstract: The invention relates to a method for determining the wear of a force-loaded linkage of an earthwork device, wherein the instantaneous load on the linkage is measured during operation of the earthwork device and used to perform a calculation of the service life.

Abstract: In a method for rehabilitating an old pipe, the outer diameter of a new pipe, which is at least equal to the inner diameter of the old pipe, is initially reduced, and the new pipe is then inserted into the old pipe, the outer diameter of the new pipe remaining at least partially reduced during the insertion process. The invention is characterized in that an expanding device is moved through the old pipe ahead of the new pipe.

Abstract: The application relates to a metering apparatus for introducing a powdery medium into a fluid, comprising a guide device for guiding the fluid and a metering device, said metering device being arranged above the guide device such that the powdery medium released by the metering unit is scattered onto the surface of the fluid.

Abstract: A metering apparatus for introducing a powdery medium into a fluid includes a mixing vessel that can be filled with a fluid and a metering unit for the powdery medium. The metering unit has an inlet for the powdery medium, an inlet for a compressed gas and an outlet extending towards the mixing vessel, through which the powdery medium and the compressed gas can be discharged into the mixing vessel.

Abstract: In a method and an apparatus for replacing old underground conduits (4), the old conduit (4) is first laid bare with the aid of a ground drilling device (8) with an overdrilling head and then, in turn, a new conduit (5) is drawn in with the aid of the drill rods (7) and at the same time—in a uniform operating step—the old conduit is pulled out of the ground.

Abstract: A horizontal drilling device according to the invention includes a linear drive, a rotary drive that can be displaced by means of the linear drive, a drill rod assembly and a rod assembly receiver, the drill rod assembly being hollow and the rod assembly receiver being designed as a receiving mandrel, which allows the drill rod assembly to be placed on the receiving mandrel

Abstract: A drilling apparatus includes a drill rig which defines a drilling rod axis, a rod magazine for a plurality of rod sections, and a transfer device for transfer of a rod section from the rod magazine and for transfer of the rod section in the drilling rod axis. The transfer device is hereby constructed to travel in the direction of the longitudinal axis of the rod section in relation to the rod magazine.