Drive and method for operating a drive of an earth drilling device

Abstract

Drive of an earth drilling device (2) for pushing or pulling the insertion of a drill string (5) with a frame (25) and a slide (12) that is movable back and forth relative to the frame (25), wherein at least one hydraulic cylinder (1) is arranged between the frame (25) and the slide (12) for moving the slide (12), characterized in that the hydraulic cylinder (1) can be detachably arranged in two different working directions between the frame (25) and the slide (12), so that the hydraulic cylinder (1) can be rotated such that, after rotating the hydraulic cylinder (1) transversely to its longitudinal direction, one and the same side of the hydraulic cylinder (1) can always be pressurized for both the pushing and pulling working movements.

Description

[0001] The invention relates to a drive for an earth drilling device for pushing or pulling the insertion of a drill string and a method for operating a drive for an earth drilling device for driving a drill string into the ground in a pushing or pulling working direction.

[0002] It is known to use a drive for an earth drilling device for pushing or pulling the insertion of a drill string, in which a push-pull drive engages projections or recesses of a drill string with a tool at its end via coupling means. For example, DE 196 08 980 C2 describes a drilling device consisting of a carriage with a hydraulic piston-cylinder unit that moves a carriage linearly back and forth. The carriage is connected to a pawl which, as the carriage is advanced, engages behind a rung of a ladder string, which is part of a drill string, thus moving the ladder string with the drill head forward in the drilling direction according to the stroke of the hydraulic piston-cylinder unit. At the end of the stroke, the pawl automatically releases from the rung and the carriage returns to its starting position.Due to the high forces, the hydraulic piston-cylinder unit is firmly connected to the slide and a frame on the carriage.

[0003] DE 198 49 611 C1 describes a hydraulic piston-cylinder unit or linear actuator that uses a double-acting hydraulic cylinder. The two cylinder chambers can be connected to a pressure source via a hydraulic line, each with a 4 / 3-way valve. A changeover valve with a pressure gauge measuring the current pressure is connected between these two cylinder chambers. A control unit switches the changeover valve when the maximum pressure is reached, thereby connecting one or the other hydraulic line to the pressure source.

[0004] DE 20 2004 005 461 U1 discloses a laying device for the underground pressing and pulling of pipes coupled to form a pipeline. The device has a locally positionable frame with two hydraulically actuated feed cylinders supported by this frame, which act on the pipeline. The housings and piston rods of the two feed cylinders, which extend side by side at a distance, are each connected to each other by a crosshead. The housings and piston rods can be moved along the frame via the respective crosshead. Furthermore, the housings and piston rods can be clamped to the frame. The clamping is such that the respective crosshead can be fixed to the frame, and the pipes of the pipeline can be coupled to the crosshead that is not fixed to the frame.

[0005] To tension or secure the respective crosshead, several spaced-apart locking chambers are provided in the longitudinal beams of the frame. Tensioning slides provided on the crosshead can be inserted into these chambers, allowing the crosshead to be tensioned to the frame by shifting the tensioning slides into two suitable, opposing locking chambers in the longitudinal beams. This describes the possibility of coupling the linkage to the slide from both sides.

[0006] The invention was based on the objective of creating an improved possibility for driving an earth drilling device and a method for operating a drive of an earth drilling device, with which a drill string can be moved cost-effectively, in particular without complex pressure control measures, in a simple design, in particular with small installation space, and / or efficiently, in particular with full available power, in both directions.

[0007] The invention addresses a pre-existing prejudice. Contrary to the prevailing opinion, which considered a fixed connection of the hydraulic piston-cylinder unit or hydraulic cylinder in general to be absolutely necessary, it was recognized that a connection of a hydraulic cylinder between the frame and the carriage of the earth drilling device that is at least detachable on one side is possible. This allows a hydraulic cylinder to be detachably positioned between the frame and the carriage in two different working directions. It was also recognized that a hydraulic cylinder can be easily rotated with respect to its working direction, even in the area of ​​an earth drilling device exposed to harsh conditions, without breaking any fixed, i.e., particularly bonded, connections.In particular, it was recognized that when the hydraulic cylinder is positioned between the frame and the slide, and rotated transversely to its longitudinal direction, the same side of the hydraulic cylinder, especially the piston side, can always be pressurized for both the pushing and pulling movements. This allows for high forces (piston area) to be available for the working movement, especially when using a differential cylinder, and high speeds for the idle stroke (due to the smallest possible piston ring area or a large-diameter piston rod). This enables high force for moving the drill string and high travel speeds of the hydraulic cylinder, particularly during the idle stroke. Furthermore, the detachable connection of the hydraulic cylinder to the slide and / or the frame facilitates easy transport.Furthermore, this design enables simple on-site assembly, even in a small excavation. Complex adjustment work is also eliminated. Specifically, it can be designed so that, in the case of a hydraulic cylinder with a cylinder tube and piston rod, the cylinder or cylinder tube remains permanently connected to the slide, and the piston rod can be detachably attached to two different areas of the frame in both working directions. This results in significant added value for the user, as these advantages were previously unattainable. The ease of assembly, transport, installation, adjustment, and / or the efficiency of operation in both directions can lead to increased efficiency.

[0008] The invention provides a drive for an earth drilling device for pushing or pulling the insertion of a drill string, comprising a frame and a carriage that is movable back and forth relative to the frame according to claim 1, wherein at least one hydraulic cylinder is arranged between the frame and the carriage for moving the carriage. The hydraulic cylinder can be detachably arranged between the frame and the carriage in two different working directions.

[0009] The term "drill string" in the sense of the description includes a string comprising an earth drilling tool and a rod, which can be moved through the earth by means of an earth drilling device or a drive device to create an earth borehole.

[0010] For the purposes of this description, the term "rod" encompasses not only rigid rods comprising individual rod sections directly or indirectly connected to one another, but in particular all power transmission elements that can be used in an earth drilling device. Rigid rod sections, which can be connected in particular by means of a plug connection, are preferred. In a particularly preferred embodiment, a plug connection can be formed between two adjacent rod sections, which is secured by means of a bolt inserted transversely to the longitudinal axis of the rod sections.

[0011] The term "drill string section" as used in this description refers to an element extending along a longitudinal axis, which is part of the drill string or borehole used for earth drilling. The drill string section can be a component located at the front of the borehole with an associated function (transmitter housing, etc.) or it can be a component that (merely mechanically) extends the borehole. The drill string section may include mechanical channels, for example, for drilling fluid, electrical wiring, electrical components, and / or electronic components.

[0012] In a preferred embodiment, a rod section as described may have an outer diameter of 25 mm to 65 mm, preferably 30 mm to 60 mm, more preferably 35 mm to 55 mm, and more preferably 40 mm to 50 mm. In a preferred embodiment, a rod section as described may have a total length of 450 mm to 650 mm, more preferably 500 mm to 600 mm, and more preferably 520 mm to 580 mm. In a preferred embodiment, a rod section as described may have a usable length that takes into account, in particular, the length of the connecting elements, especially those provided at the ends, for example, in the case of a plug connection, the length of the connector socket and / or the plug. The usable length may be calculated by subtracting the length of the connecting element(s) from the total length and may be 400 mm to 600 mm, more preferably 450 mm to 550 mm, and more preferably 475 mm to 525 mm.In a preferred embodiment, a drill string section as described above can have a groove for engaging a drive element for moving the drill string, for example, a (locking) pawl, which can have an outer diameter of 15 mm to 55 mm, preferably 20 mm to 50 mm, more preferably 25 mm to 45 mm, and more preferably 30 mm to 40 mm. In a particularly preferred embodiment, the overall length of the drill string section can be 550 mm and the outer diameter of the drill string section can be 45 mm. In a particularly preferred embodiment, the usable length of the drill string section can be 500 mm. In a particularly preferred embodiment, the outer diameter of a groove for engaging a drive element for moving the drill string can be 35 mm.The stated values ​​for the outer diameter of the drill string, the (total) length of the drill string, the usable length of the drill string, and the outer diameter of a groove on the drill string are not limiting values; it should be emphasized that adjustments can be made to external conditions, in particular the size of the excavation or shaft for the arrangement of the earth drilling device and / or the nature of the soil, in order to carry out earth drilling efficiently.

[0013] The term "earth auger" encompasses a drill head located at the front end of the drill string, which may include moving parts. However, it is also possible for the auger to have a fixed or rigid, or largely fixed or rigid, outer contour.

[0014] The term "earth drilling device" encompasses, for the purposes of this description, any device capable of moving a drill string, particularly one comprising drill sections, within an existing or planned channel in the ground, in order to create or enlarge a borehole, especially a horizontal borehole, or to pull pipes or other long objects into the ground. An earth drilling device may include a drive or drive mechanism that pulls and / or pushes the drill string. It may also be provided that the drive can rotate the drill string within a certain angular range around its longitudinal axis. A rotary drive is possible, and a reciprocating motion in the form of a rotational movement in both directions around the longitudinal axis of the drill string within a certain angular range (a so-called "paddle" operation) is also possible.

[0015] The term “horizontal drilling” as used in this description includes in particular any type of existing or to be created, preferably horizontal, channels in a body, especially earth channels including earth boreholes, rock boreholes or underground conduits as well as underground or aboveground pipelines and water channels that can be produced or installed by using a suitable earth drilling device.

[0016] For the purposes of this description, the term "frame" refers to a component of an earth drilling device that can be arranged in an excavation or shaft, particularly a manhole, to guide the reciprocating movement of a carriage relative to the frame. The frame supports the earth drilling device in an excavation, shaft, or on the ground. The frame defines a guide or track for the reciprocating movement of the carriage. In a preferred embodiment, the frame has a rectangular base. The frame can have a length, along the longitudinal extent of the hydraulic cylinders, that is preferably 550 mm to 1050 mm, more preferably 600 mm to 1000 mm, more preferably 650 mm to 950 mm, more preferably 700 mm to 900 mm, more preferably 750 mm to 900 mm, and more preferably 800 mm to 900 mm.The frame can have a length transverse to the longitudinal extent of the hydraulic cylinders, preferably 350 mm to 600 mm, more preferably 350 mm to 550 mm, more preferably 350 mm to 500 mm, more preferably 400 mm to 500 mm, and more preferably 450 mm to 500 mm. These dimensions can refer to the base area, wherein, in addition to the frame, a guide tube for supporting the frame in the excavation or shaft can be provided, particularly extending transversely to the longitudinal direction of the hydraulic cylinder. Support elements can be extended from this guide tube and positioned against the excavation or shaft.

[0017] The term "sled" as used in this description includes an element of the earth drilling device which has an engagement element for engaging with the drill string and which is movable back and forth relative to the frame.

[0018] In a preferred embodiment, the hydraulic cylinder can be positively connected to the slide and / or the frame in both different directions by inserting or placing the hydraulic cylinder into receptacles on the slide and / or frame. This allows the hydraulic cylinder to be easily detached from the frame or slide if necessary. The direction of action of the hydraulic cylinder can be reversed. Additionally, the simple insertion or placement of the hydraulic cylinder facilitates easy disassembly and transport of the drive unit. If the hydraulic cylinder can be lifted out of a receptacle, then, in particular, no material-bonded connections between the frame and the hydraulic cylinder or between the slide and the hydraulic cylinder need to be broken.

[0019] In a preferred embodiment, the hydraulic cylinder can be easily detached and selectively connected to both the frame and the slide. If detaching and connecting the slide or the frame is described, this description can also be used for the other connection to the hydraulic cylinder. However, it is also possible for the hydraulic cylinder to be attached to the slide in such a way that easy detachment, particularly by removing or lifting the hydraulic cylinder, is not possible; for example, the hydraulic cylinder can be fixedly mounted to the slide so that it can pivot about a pivot point, so that, in particular, the cylinder or cylinder tube of the hydraulic cylinder remains connected to the slide, and the piston rod is detachably attached to another area of ​​the frame.Particularly preferably, the cylinder tube can be arranged or detachably connected in the area of ​​the slide in both working directions of the drive; the piston rod of the hydraulic cylinder can be detachably connected to the frame in both working directions, wherein the piston rod can be connected in one working direction to a section of the frame that is closer to the earth borehole, and in the other working direction to a section of the frame that is further away from the earth borehole.

[0020] In a preferred embodiment, the hydraulic cylinder has a piston rod and a cylinder tube, wherein the piston rod and / or the cylinder tube a (a) first intervention element or a (b) receptacle for a second intervention element and the sled and / or the frame a (a) receptacle for the first intervention element or (b) the second intervention element.

[0021] The described design enables a positive locking mechanism that secures the hydraulic cylinder to the slide and / or the frame. Due to the force acting in one direction or exerted by the hydraulic cylinder, a simple yet secure positive locking arrangement can be achieved.

[0022] In a preferred embodiment, the first engagement element and / or the second engagement element is a groove formed between two boundary surfaces, wherein the groove, the receptacle, and the boundary surfaces are adapted to one another such that a positive fit in the longitudinal direction of the piston rod and / or the cylinder tube is achieved. This allows for a simple geometric design of the elements for engaging the hydraulic cylinder and frame and / or the hydraulic cylinder and slide. The formation of a groove with corresponding boundary surfaces and an engagement element adapted to the groove provides a structurally simple way to design the drive.

[0023] In a preferred embodiment, the slide has a receptacle adapted to the cylinder or cylinder tube. The dimensions or length of the receptacle can be substantially identical to the length of the cylinder or cylinder tube, or to the distance between two structural elements on the cylinder or cylinder tube, particularly stops, so that the cylinder or cylinder tube can be easily inserted into the receptacle on the slide to form a detachable connection between the hydraulic cylinder and the slide. The receptacle on the slide can have two structural elements, particularly in the form of two projections, spaced apart along the longitudinal axis of the hydraulic cylinder, each with a surface. The two surfaces can, in particular, face each other.With the cylinder tube inserted, the two surfaces can interact with two stops on the cylinder tube in such a way that each surface simultaneously rests against a stop on the cylinder tube, thus enabling the slide to be fixed to the cylinder tube in both directions of movement of the hydraulic cylinder. Alternatively, or in addition, the frame may be provided with at least one, preferably two, receptacles adapted to a structural element of the piston rod, allowing the structural element to be inserted into the frame to form the connection between the piston rod or the hydraulic cylinder and the frame. The frame may also be provided with at least one end-face receptacle into which a structural element of the piston rod can be inserted. Preferably, two end-face receptacles may be provided, formed on opposite end faces.The arrangement of two mounts on opposite end faces is preferably such that the connecting line of the two mounts runs along the two working directions. By forming a mount on one end face of the frame, the entire length of the frame can be used for the arrangement of the hydraulic cylinder.

[0024] A handle can be incorporated into the structural elements of the cylinder tube, which may be designed for fixing in the slide mount, to simplify the transport and handling of the hydraulic cylinder. For example, the handle can be designed as an element connecting the longitudinally spaced stops on the cylinder tube. This simplifies the planning, design, and manufacturing processes. The handle can extend parallel to the cylinder tube at a distance from it.

[0025] In a preferred embodiment, the hydraulic cylinder is a differential cylinder, which offers a cost-effective solution. Furthermore, a differential cylinder eliminates the need for complex pressure control measures. In a particularly preferred embodiment, a hydraulic cylinder can be selected with a large piston rod diameter relative to the piston area, as this allows for a smaller piston ring area. The hydraulic cylinder can have a length of 400 mm to 650 mm, preferably 450 mm to 600 mm, more preferably 500 mm to 600 mm, and more preferably 500 mm to 550 mm. The hydraulic cylinder can have a piston diameter of 50 mm to 120 mm, more preferably 50 mm to 100 mm, and particularly 70 mm. The hydraulic cylinder can have a stroke in the range of 200 mm to 350 mm, more preferably 200 mm to 300 mm, and more preferably 250 mm to 300 mm, and particularly 270 mm.The piston rod diameter of the hydraulic cylinder can range from 25 mm to 60 mm, preferably from 25 mm to 50 mm. It is possible that the ratio between piston diameter and piston rod diameter is such that, with essentially the same oil flow for both directions of movement, the velocity when the piston ring area is under pressure (idle stroke) is approximately twice as high as when the piston area is under pressure for the working stroke.

[0026] In a preferred embodiment, two hydraulic cylinders are provided, arranged symmetrically to each other and to the frame and / or slide. This allows the force to act symmetrically between the slide and the frame, ensuring a stable and uniform force distribution.

[0027] In a preferred embodiment, an engagement element, for example in the form of a pawl, is rotatably arranged on the slide. A pawl can provide a simple design for an engagement element with which the drill string can be engaged and a force can be applied to it. Drill rod sections with one or more recesses or grooves on their outer surface can be used to engage the drill string.

[0028] In a preferred embodiment, a plug-in or screw-in connection element for attaching a hydraulic line is provided on the cylinder tube. This design simplifies transport and disassembly of the drive, as, for example, in addition to removing the hydraulic cylinder from the slide and / or frame, supply lines for connecting a hydraulic line to the cylinder tube can also be disconnected.

[0029] The invention also provides a method for operating a drive for an earth drilling device for driving a drill string into the ground in a pushing or pulling direction, comprising a frame, a carriage movable back and forth relative to the frame, and at least one hydraulic cylinder between the frame and the carriage for moving the carriage relative to the frame. To reverse the direction of travel, the hydraulic cylinder is detached from the frame and / or carriage and rotated transversely to its longitudinal axis. Preferably, the cylinder tube can remain in the area of ​​the carriage even after the hydraulic cylinder has been rotated.there again, and the piston rod of the hydraulic cylinder can be connected to the frame in both positions, with the piston rod being connected in one working direction to a section of the frame that is closer to the earth borehole, and in another working direction to a section of the frame that is farther away from the earth borehole.

[0030] The use of a drive for an earth drilling device is also described, used for pushing or pulling the insertion of a drill string. The drive consists of a frame and a carriage that can move back and forth relative to the frame. A hydraulic cylinder is arranged between the frame and the carriage to move the carriage. A releasable, selectable connection of the hydraulic cylinder is used to change the direction of operation of the drive.

[0031] The descriptions of the individual aspects of the invention, as they relate to the drive and the method, are to be understood as complementary. Descriptions of one aspect also apply to the description of one of the other aspects.

[0032] The foregoing statements, as well as the following description of exemplary embodiments, do not constitute a waiver of certain embodiments or features.

[0033] The invention is explained in more detail below with reference to an embodiment shown in the drawings.

[0034] The drawings show: Fig. 1. An earth drilling device with a drill string and a drive in a side view in a partially cut-away schematic representation; Fig. 2 a drive in a first working direction of an earth drilling device in isometric representation; Fig. 3 the drive of the Fig. 2 with changed working direction in isometric representation; and Fig. 4 an enlarged view of a section of the drive system Fig. 2 and Fig. 3 from the top.

[0035] Fig. Figure 1 shows a side view and a partially cutaway schematic representation of an earth drilling device 2, which is inserted into a starting pit 3. Using the earth drilling device 2, a drill string 5 with a front-mounted earth drilling tool in the form of a drill head 6 can be inserted into the ground 8. A transmitter receptacle 7 is arranged behind the drill head 6 in the drill string 5.

[0036] The pushing or pulling insertion of the drill string 5 is achieved by means of two hydraulic cylinders 1, which move a pawl 10 back and forth. The pawl 10 is attached to a slide 12. The pawl 10 is rotatably mounted on the slide 12 to allow for changes in the working direction. The slide can move relative to a frame 25, which has a front frame plate 20 and a rear frame plate 14 at its end faces, by actuating the hydraulic cylinders 1. A fixed point for the detachable attachment of the hydraulic cylinder 1 is provided on both the front frame plate 20 and the rear frame plate 14 of the frame 25.

[0037] To move the drill string 5, the pawl 10 slides into the Fig. 1 and Fig. In the position shown in Figure 2, during the retraction (idle stroke), the drill string 5 exits a groove 9 and falls into another groove 9 upon reaching it, so that the hydraulic cylinders 1 move the drill string 5 into the working position, as shown in Figure 2. Fig. Figure 2 schematically shows that it can be advanced further.

[0038] For a moving, in Fig. In the working direction shown in section 3, the hydraulic cylinders are rotated perpendicular to their longitudinal direction. It is possible that the cylinder or piston side of hydraulic cylinder 1, which provides the greater force, is (continued to) be available for the working stroke, while the piston rod side is (always) used for a rapid return stroke.

[0039] While Fig. 2 for a sliding insertion of the drill string 5, the arrangement of the hydraulic cylinders 1 opposite the slide 12 and frame 25 is shown. Fig. 3 a pulling direction of work, whereby both in the Fig. 2 as well as in the Fig. Figure 3 shows the position of the hydraulic cylinders 1 after completion of the working stroke (cylinders extended).

[0040] In Fig. In the two hydraulic cylinders 1 with their piston rods 4, the cylinders are suspended in grooves 13 of a rear frame plate 14. The piston rods each have a recess or groove 27 adapted to the thickness of the frame plates 14 and 20. The groove 13 in the frame plates 14 and 20 is adapted to the diameter of the piston rod 4 in the area of ​​the groove 27. The frame plate 14 forms the fixed point for the thrust or the pushing direction, as can be used, for example, for a pilot bore.

[0041] The cylinder tubes 11 of the hydraulic cylinders 1 are engaged in projections 17 of the slide 12 via a groove 15 on one side and a stop 16 on the other, as shown in Fig. 4, which is a view of the drive of the Fig. 2 and Fig. Figure 3, shown in an enlarged view from above, illustrates the connection. A stop 16 is provided on each of the cylinder tubes 11 for a projection 17. The cylinder tube 11 is fixed between the projections 17 by means of the stops 16. The stops 16 fix the cylinder tube 11 between the projections 17 in both working directions of the hydraulic cylinder 1. A handle is provided between the stops 16 for handling the cylinder tube 11 or the hydraulic cylinder 1, by means of which the hydraulic cylinder 1 can be lifted out of the slot 12 and the groove 13.

[0042] In the Fig. Guide tubes 50 are arranged on the frame 25, 2 to 4, extending parallel to the working direction of the earth drilling device 2 or the direction of movement of the carriage 12. Extendable support elements, not shown, can be arranged in the guide tubes 50, by means of which the frame 25 can be supported in the excavation or shaft.

[0043] If the piston sides of the hydraulic cylinders 1 are now pressurized via the hydraulic quick-release couplings 18, the carriage 12 moves in the Fig. 2. The illustration shown points to the left, as indicated by the arrow in Fig. 2 schematically indicates that the sled 12 is in the Fig. In the embodiment shown in Figure 2, the drill head moves to the left. The pawl 10 engages in a groove 9 of the drill string 5 and advances it. The idle stroke then occurs, during which the piston ring chamber of the hydraulic cylinders 1 is pressurized via the hydraulic quick-connect couplings 26. This idle stroke is performed at high speed, particularly when the diameter of the piston rods 4 is large, resulting in very small piston ring areas. During the idle stroke, the pawl 10 moves out of a groove 9 of the drill string 5 via a chamfer 19. At the end of the idle stroke, it pivots back into another groove 9 of the drill string 5 to perform another working stroke and thus continue the advance. Once the drill head 6 has reached, for example, a target excavation (not shown), it can be replaced with a tool (not shown) for pulling in pipes of all kinds.

[0044] For the pulling drive of the drill string 5, the drive is inserted into the Fig. The configuration shown in section 3 has been implemented.

[0045] Unlike the Fig. In step 2, the hydraulic cylinders 1 were rotated 180° perpendicular to their longitudinal axes. To do this, the hydraulic cylinders 1 were raised, and the piston rods 4 with their grooves 13 were engaged in the front frame plate 20, and the cylinder tube 11 was engaged in the slide 12. For the pulling direction, the front frame plate 20 now serves as the fixed point for retraction. The pawl 10 was reversed so that it could act in the opposite direction. When the pistons of the hydraulic cylinders 1 were pressurized, the pawl 10 again engaged in a groove of the drill string 5 and, as shown, pushed it to the right, allowing a pipe (not shown) to be pulled into the already drilled pilot bore.

[0046] As already mentioned regarding the Fig. As described in section 2, the steps of the working stroke and the empty stroke are repeated, for example, until the pipe to be pulled in reaches the starting excavation pit 3. Using the method described in Fig. In the configuration of the earth drilling device 2 shown in section 3, the working stroke is carried out with high force by pressurizing the piston side and the idle stroke at high speed by pressurizing the piston ring side.

Claims

[1] Drive of an earth drilling device (2) for pushing or pulling a drill string (5) with a frame (25) and a carriage (12) which is movable back and forth relative to the frame (25), wherein at least one hydraulic cylinder (1) is arranged between the frame (25) and the carriage (12) for moving the carriage (12), characterized by that the hydraulic cylinder (1) can be detachably arranged between the frame (25) and the carriage (12) in two different working directions, so that the hydraulic cylinder (1) can be rotated in such a way that after rotating the hydraulic cylinder (1) transversely to the longitudinal direction thereof, one and the same side of the hydraulic cylinder (1) can always be subjected to pressure for the working movement when pushing and for the working movement when pulling. [2] Drive according to claim 1, wherein the hydraulic cylinder (1) can be positively connected to the carriage (12) and / or the frame (25) in the two different directions by means of inserting or placing the hydraulic cylinder (1) in receptacles (7) on the carriage (12) and / or frame (25). [3] Drive according to claim 1 or 2, wherein the hydraulic cylinder (1) has a piston rod (4) and a cylinder tube (11), wherein the piston rod (4) and / or the cylinder tube (11) a) first engaging element or a b) receptacle for a second engagement element and the carriage (12) and / or the frame (25) a a) Receptacle for the first engagement element or the b) have a second engagement element. [4] Drive according to claim 3, wherein the first engagement element and / or the second engagement element is a groove (13, 15, 27) formed between two boundary surfaces, wherein the groove (13, 15, 27), the receptacle and the boundary surfaces are adapted to one another in such a way that a positive connection in the longitudinal direction of the piston rod (4) and / or the cylinder tube (11) is achieved. [5] Drive according to one of claims 1 to 4, wherein the hydraulic cylinder (1) is a differential cylinder. [6] Drive according to one of claims 1 to 5, wherein two hydraulic cylinders (1) are provided which are arranged symmetrically to each other to the frame (25) and / or carriage (12). [7] Drive according to one of claims 1 to 6, wherein a pawl (10) is rotatably arranged on the carriage (12). [8] Drive according to one of claims 3 to 7 as dependent on claim 3, wherein an element of a plug-in or screw connection (18, 26) for connecting a hydraulic line is formed on the cylinder tube (11). [9] Method for operating a drive of an earth drilling device (2) for driving a drill string (5) in a pushing or pulling working direction into the ground (8) with a frame (25), a carriage (12) which can be moved back and forth relative to the frame (25), and at least one hydraulic cylinder (1) between the frame (25) and the carriage (12) for moving the carriage (12) relative to the frame (25), wherein the hydraulic cylinder (1) is released from the frame (25) and / or the carriage (12) and is rotated transversely to its longitudinal axis in order to reverse the working direction.

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