Abstract: In a drilling method for creating a channel leading from surrounding soil into a shaft which is separated from the soil by a wall, a channel is drilled through the soil from a starting pit in the direction of the shaft using a first drill head. The first drill head continues to drill in this direction in order to create a breach in the wall, and a second drill head is then used in the shaft to widen the breach in the wall by drilling in the opposite direction with the second drill head.

Abstract: In a method for producing and widening ground bores or for the destructive replacement of buried lines with the aid of a tool arranged at the end of a rod driven by a boring device, the rod is built up from individual sections which are to be connected to one another in a machine excavation (staring excavation). In order to allow the use even of rod sections whose length is equal or almost equal to the diameter of the machine excavation, the boring device, prior to the introduction of a new rod section, is displaced, for example inclined, in such a manner that the rod section can be slid into the boring device, for example from outside the excavation, without interference from the rear end, projecting into the machine excavation, of a rod section which has already been introduced into the ground. As soon as the rod section has been slid in, the boring device together with the rod section is moved into a position in which it is aligned with the boring direction or the rod part which is already in the ground.

Abstract: The invention relates to an apparatus and a method for joining a pipe conduit to a drilling device, expanding device or pull-in device, in which a pulling-force generator arranged in the drilling device, expanding device or pull-in device exerts a compressive force on a pipe conduit, to be pulled in, via a pulling means and an adapter and thereby holds the individual short pipes of the pipe conduit together and reduces the mechanical stress to which the short pipes are subjected.

Abstract: A drilling or flushing medium is used in the operation of an actuator for controlling an earth working device which uses the drilling or flushing medium for its operation as well. The actuator is acted upon by the medium , which can be retained in the actuator through suitable operation of a valve assembly, while at the same time can be supplied to the earth working device to execute a desired function. The valve assembly is hereby actuated by a separate switch.

Abstract: The invention relates to a steerable soil displacement hammer for horizontal ground boring, comprising a body that can be rotated by means of a longitudinal element, and a thrust head that is mounted rotationally in relation to the body. A rotation of the body in relation to the thrust head causes the thrust head to pivot out into an asymmetrical constellation or to pivot to a symmetrical constellation. The invention also comprises a retaining feature which provides a hold in the environment and which permits a relative rotation of the body and simultaneous pivoting of the thrust head. The soil displacement hammer can be driven forwards or backwards and the retaining feature is situated in the area of the pivot axis of the thrust head.

Abstract: An apparatus for overdrilling a buried line includes a rotatably driven thrust linkage and/or traction linkage, and has a forward end which is connected to a ring-shaped to hollow cylindrical overdrilling head which embraces the line. The overdrilling head is provided interiorly with a centering protrusion for spontaneous centering of the overdrilling head in concert with the line.

Abstract: In a drilling device with a drive unit for rotation and advance the rod assembly has a plurality of pipe sections interconnected by means of plug-type connections torque proof in both directions. A tension rod protrudes through the interior of the rod assembling. The pipe sections are braced among each other with aid of the tension rod. The tension rod can be made of pipe sections or of a tension rope and allows the possibility, that the rope assembly can be moved in its integrity against the drilling direction.

Abstract: A cutting system for splitting pipes includes a main body and at least one blade and at least two blade mount assemblies by which the blade may optionally be connected to the main body. The first blade mount assembly, in a particular fitted state, holds the blade at a different distance from the longitudinal axis of the main body than the second blade mount assembly.

Abstract: The invention relates to a method for horizontal ground drilling, in particular for rock drilling, by means of a ground drilling apparatus which can be driven forward in rotation and percussively, the apparatus having compressed air and drilling medium applied to it alternately or simultaneously, and the compressed air and the drilling medium being supplied via one channel.

Abstract: The invention relates to a method for horizontal drilling with a percussion implement and a percussion head or percussion head element mounted in a movable manner relative to the percussion implement, the percussion impulse being transmitted in at least three steps.

Abstract: The invention relates to a method for horizontal ground-boring, in particular for rock-boring, by a rotating and hammering driven ground-boring device, whereby the device is alternately or simultaneously supplied with compressed air and drilling medium and the compressed air and drilling medium are supplied through a channel.

Abstract: A cutting device for cutting or bursting a pipeline includes a basic body having at least one cutting or perforating element, wherein the cutting or perforating element discontinuously cuts the pipeline in the longitudinal direction or at least discontinuously weakens the pipe material.

Abstract: A sewer pipe (30) comprising partial pipe shells (31, 32) placed on one another and connecting means (33) connecting the partial pipe shells (31, 32) firmly to each another. A laying method for the sewer pipe, in which the end of the sewer pipe is connected to a boring device and is drawn into the ground by means of the boring device.

Abstract: A device for replacing lines without excavation including an annular overdrilling head and a drive for rotating a front module arranged on the drilling head.

Abstract: Rod linkage for rod segments for a horizontal earth drill, whereby the rod segment ends can be interconnected by displacing the rod segment axes in parallel. The invention relates to a rod linkage for horizontal earth drilling which is characterized in that the ends of the rod segments can be interconnected by displacing the rod segment axes in parallel.

Abstract: A pipe guide adapter for drawing pipes into a channel with the aid of a traction means is provided with ribs arranged conically on a base pipe, which ensure guidance of the pipe and, at the same time, a simple construction of the adapter. In addition, the pipe guide adapter can be provided with rollers, which are arranged in the free spaces between the ribs and improve the guide function of the pipe guide adapter (FIG. 2).

Abstract: The invention relates to a control system for a percussion drive of an earth drilling unit having a housing, a drilling tool, a pulling or thrusting drive, a percussion piston, a pressure chamber belonging to the percussion piston and a pressure medium feed, which can be connected and disconnected, for the operation of the percussion piston, wherein the connecting and disconnecting of the pressure medium feed occurs when the pulling or thrusting drive exceeds or falls below a specific pull or thrust.

Abstract: The invention relates to a rod transfer device for horizontal driving units for underground trenchless driving, having a storage container and a pivotable gripper, the gripper being arranged in such a way that the orbit of the gripper intersects both the transfer region of the storage container and the drilling axis.

Abstract: Method and apparatus for underground drilling and enlarging of holes, in particular in hard rock, by using a water-driven motor as drive unit.

Abstract: In a method of regulating the feed force of a drilling device having a hydrostatic bore hole motor at the end of a linkage provided with a rotary and a feed drive, the feed of the linkage is set as a function of the pressure of the drive fluid for the bore hole motor in such a way that the liquid pressure remains in a predefined range or else remains constant. If the bore hole motor is equipped with an eccentricity for directional boring, for example with an angled housing, then, in addition or else independently of the feed control, directional deviations normally resulting from the linkage torsion can be compensated for by the eccentricity or the linkage being set to a corrected path angle.