Abstract: The invention relates to a mixing system for the preparation of a drilling fluid for horizontal drilling methods, having a high-pressure pump and a feed line for the additive medium arranged upstream of the high-pressure pump in the direction of flow.

Abstract: A device for connecting a towed pipe to a towing apparatus, for example a percussion boring machine or a towing head, comprises an adapter sleeve adapted to the towing apparatus and a towed pipe of which the connecting end is, for example, provided with longitudinal slits and accordingly can be changed in diameter, and locking means by which the adapter sleeve and the towed pipe can be connected together in a sufficiently tension-resistant manner.

Abstract: In the case of an earth boring apparatus, preferably a thrust boring apparatus, the head of which is actuated by a pneumatically operated reciprocating ram, a supply hose (5) provides the connection from a compressor as an example to the thrust boring apparatus which also serves to reverse the direction of operation by the rotation of the hose. To ensure error-free control over greater lengths of hose and to avoid kinking—partly due to the pressure from surrounding ground—the hose (5) is equipped with a snugly fitting corset (12) in the form of a spring wire spiral or a woven wire support.

Abstract: Apparatus and method for the trenchless laying of pipework underground, having a total and a gauge for the continuous widening of a preferably wound preformed pipe on a linkage for use in pits of small dimensions, preferably inspection shafts of sewage systems.

Abstract: A positive connection between a pipe and a ring inserted into the pipe, in particular between the housing of a ram boring device and a stop ring inserted into the housing, wherein the inside wall of the pipe has a convex groove consisting of a section of a surface of a sphere and the ring has a corresponding convex outer surface with the same radius, the inside wall of the pipe possessing at least one axial groove permitting insertion into the pipe or the outer surface of the ring possessing at least one flattened portion permitting insertion into the pipe, or the ring being axially divided into two or more preferably unequal segments.

Abstract: In a ram drilling tool for producing bores in the ground and having a percussion piston which is moved to and fro in a casing, a control sleeve is guided such that it can be displaced on a control pipe projecting into a percussion-piston chamber and whose axial position determines the direction of movement of the tool. In order to permit the movement to be reversed, a control chamber connected to a control-air line is arranged between the control pipe and the control sleeve, and its front end terminates flush with a collar at the front end of the control pipe.

Abstract: The invention pertains to a method for introducing and removing rod sections into and from the push/pull axis of a push/pull unit, the individual rod sections being essentially arranged one after another and being joined to one another or detached from one another by being rotated in or out about an axis located essentially perpendicular to the axis of the rod section.

Abstract: In a ram drilling tool having a steering element, for example a steering head, which is mounted in the tool casing such that it can move, for example rotate, the tool casing is connected to a pressure-medium line such that it cannot rotate and to a sleeve pipe such that it can rotate; it may therefore be adjusted with low friction by means of rotation with the aid of the pressure-medium line with respect to the steering element, which is firmly held by the ground.

Abstract: An apparatus for longitudinal splitting, in particular longitudinal slitting, of pipes laid underground and for the simultaneous trenchless pulling-in of a new pipeline comprises a carriage in the form of a frame, in which a cutting wheel for cutting open the pipe wall and a support roller, which serves as an abutment and is supported on the pipe wall, are arranged above one another. The carriage or frame has a base which engages in a form-fitting manner in a frame-like window of a pull and/or push linkage.

Abstract: A system for transfer of data or electric current for a steerable horizontal boring machine for laying and destructive replacement of supply lines, which is suitable both for percussive and for rotary drilling operation and permits reliable and problem-free use of a cable connection between a consumer or sensor and a power supply or a data utilising unit, preferably comprises three elements (machine adapter, string adapter, transmitter adapter) for connecting the cable.

Abstract: In apparatus for producing and expanding earth boreholes and for destroying and replacing underground pipelines or for driving in pipes, a feed drive and a rotary drive having a plug-in coupling comprising a chuck and a locking portion at the end of a string is located in a frame. The string comprises a plurality of sections or lengths having an internal screw thread at one end and an external screw thread on the locking portion at the other end, which at the same time is provided with a key face to hold fast said string section while it is screwed together with the next following string section.

Abstract: A device for connecting a towed pipe to a towing apparatus, for example a percussion boring machine or a towing head, comprises an adapter sleeve adapted to the towing apparatus and a towed pipe of which the connecting end is, for example, provided with longitudinal slits and accordingly can be changed in diameter, and locking means by which the adapter sleeve and the towed pipe can be connected together in a sufficiently tension-resistant manner.

Abstract: An apparatus for widening microtunnels and/or for the destruction and replacement of ground-laid pipework and for the laying of new pipework possesses a tool which displaces the earth and/or destroys and/or displaces pipework laid in the earth, having a housing which is provided with an axial linkage seating, for example a housing passage for a linkage and with a linear drive which moves the tool, for example, on the linkage automatically from a launch pit to an arrival pit and simultaneously lays a follow-up pipe or a follow-up cable in the earth.

Abstract: In an apparatus for drilling in earth, a push-pull linkage, especially a ladder-type linkage consisting of individual sections connected together in each case by a plug-in coupling, is connected to a push-pull drive, and a stationary locking pawl and a thrust pawl which is moveable in the longitudinal direction of the linkage and is connected to the drive, with two mutually opposite directions of action, can each be brought into active connection with the linkage in order to move the linkage forward stepwise and lock it temporarily after each movement step.

Abstract: In directional boring using a boring apparatus having a driven string and a drill head with an excavating tool moving in an orbit about the longitudinal axis of the string, the tool moves with substantially constant angular velocity when boring straight ahead, but when boring along a curve it is stopped and set in vibration in order to obtain more accurate control of the curve.

Abstract: The invention pertains to a machine for producing or widening ground bores and/or for shattering old pipelines and laying new pipelines, consisting of a push-pull unit and a rod assembly that is connected to and driven by the push-pull unit and extends through the ground bore or the pipeline, with projections and/or recesses being arranged on the rod assembly, and with positive coupling means that engage on the projections or in the recesses arranged on the push-pull unit.

Abstract: In a machine for horizontal or inclined percussion boring in the ground having a percussion boring string which has an oblique-face boring head at one end and an impact mechanism at the other end, the impact mechanism is mounted beside the rotary drive in order to reduce the length of the machine.

Abstract: The invention relates to an automatically driven pile-driver drilling device for drilling into the earth with a percussion piston moving axially inside a casing, driven by a pressure medium and changeable from a forward stroke to a backstroke, with a working space having radial control openings, a guide pipe with radial control openings extending into the working space and forming a rigid part of the housing, and a control box guided into an annular chamber of the guide tube and axially adjustable in a spring-pneumatic manner.

Abstract: In a percussion drill apparatus for soil drilling with a percussion piston which is moving to and fro within a housing, a control sleeve is mounted on a control tube which protrudes into the percussion piston chamber, the axial position of which determines the direction of movement of the apparatus. In order to make a reversal of movement possible a reversing chamber is connected with a control air line which runs inside the control tube and an approach chamber is connected by way of a drilling with the interior of a control tube which feeds the operating air into the percussion piston chamber. Consequently the control sleeve is moved into one direction with the aid of the control air and in the other direction with the aid of the operating air.

Abstract: A boring-rod magazine which can be moved into the drilling axis of a boring machine. The boring-rod magazine may contain a plurality of boring rods, and holds a boring rod to position it in the drilling axis, and then releases the boring rod when boring-rod magazine is removed. The boring-rod magazine may include a carousel closed by a cover with a transfer opening for the boring rods. The magazine may include compartments for the boring rods, and spring mechanisms for holding and releasing the rods. The magazine may be rotated by a drive and kept in position by a rotary stop.