EP3699391B1 - Soil drilling device and method for drilling in soil - Google Patents

Description

The invention relates to an earth drilling device for drilling in the ground using a drill rod and a method for drilling in the ground using a drill rod.

Earth drilling devices, in particular horizontal drilling devices, are used in order to drill earth holes, for example for supply and disposal lines, into the ground in a trenchless manner, or to replace old lines that have already been laid without trenching. In order to drill the earth bores, a drill rod having drill rod sections is usually used, in which the drill rod sections can be connected to one another.

For example, it's over EP 0 886 034 B1 It is known to use a carriage reciprocable in a frame for advancing and/or pulling a drill string. The carriage has a socket for a section of drill string, so that the section of drill string can be moved in the direction of a feed axis to create the earth bore in the socket. The drive acting on the drill rod section can have a rotational and/or translational effect on the drill rod section in the receptacle. Another example of this can be EN19917538 be removed.

When changing rods or lengthening a drill rod, the holder of the drill rod that has already been inserted (drilled) into the ground is usually released and the carriage is moved in the opposite direction to the feed direction and a new drill rod section, which is to be connected to the drill rod that has already been drilled, placed in the mount of the slide. The carriage is then moved in the feed direction and the drill string section is connected, in particular screwed, to the drill string that has already been drilled. For this purpose, threads are arranged at the ends of the drill rod sections, which threads are used for screwing the drill rod sections. For bolting on a drill string, it is common to "unlock" the carriage such that the carriage can move during the formation of the connection of the socket to the drill string and the connection of the string to the drilled string. Accordingly, the carriage moves in the direction of the drill string essentially by the length that is predetermined by the screwing process or processes. There are two screwing operations to be considered. On the one hand, screwing the new rod section to the drill rod and screwing the holder to the new rod section. Once the screwing process has been completed, the carriage must first be moved again carefully by means of the drive, in particular until the path that has been set by the screwing process or processes has been compensated for. Only then can you continue drilling with a higher feed force and higher speed.

It is therefore disadvantageous that each time the drill rod is lengthened by a further section of drill rod, the carriage has to be started up again and again, and the time required to drill the earth bore is increased.

The invention was therefore based on the object of creating an improved earth drilling device and a method for drilling in the ground, with which improved drilling of a ground drilling is possible, in particular faster drilling of the ground drilling is possible.

The object is achieved by the subject matter of the independent patent claims. Advantageous developments of the subject matter of the subordinate patent claims are the subject matter of the respective dependent patent claims and result from the following description.

The core idea of the invention is to carry out a receptacle for a rod section, which is to be screwed to the drill rod that has already been drilled, so that it can be displaced relative to the carriage. Because the receptacle can be moved relative to the carriage, in particular in the direction of the drill rod or away from it, it is possible to compensate for a change in the position of the receptacle caused by the screwing in relation to the rod section to be screwed or loosened. It must also be taken into account that the position of the new rod section to be added also changes when it is connected to the drill rod and the receptacle. The slide itself can - although the recording itself moved to compensate for the change in length caused by the screwing - stand still and, in particular, remain in direct frictional contact with the drive driving the carriage. In this way, the drilling process can be continued immediately after the screwing process. A careful approach of the carriage after the lengthening of the drill string by means of a rod section to be screwed to the drilled drill string can be reduced or omitted entirely.

The inventors have broken with the idea that the mount must be rigid to the slide. Providing relative movement between the socket and the carriage contradicted the previous idea that there must be a solid, unchanging or fixed connection between the socket and the carriage in order to transmit the high forces required to be applied to the drill string.

The invention provides an earth-boring device for drilling in the ground by means of a drill rod, the earth-boring device having a drill carriage and a carriage that can be moved translationally on the drill carriage. A receptacle is arranged on the carriage. The receptacle is provided for screwing a section of rod to the drill rod or for loosening a section of rod from the drill rod by screwing. The receptacle can be moved in translation relative to the carriage in that a carrier carrying the receptacle is slidably arranged on the carriage and is selectively releasably fixed to the carriage in order to compensate for a change in the position of the receptacle caused by the screwing.

In the context of the description, the term "earth drilling device" includes any device that moves, in particular, a drill rod containing rod sections in an existing or to be created channel in the ground, in order to create or widen a bore, in particular a horizontal bore, or to create lines or other long bodies to sink into the ground. An earth drilling device can comprise a drive device which drives a drill rod in a pulling and/or pushing or pushing manner. It can additionally or alternatively be provided that the drive device drives the drill pipe in rotation. An earth boring device can be a device that drives a drill string and that works in particular to displace soil.

The term "horizontal drilling" (horizontal drilling) in the sense of the present description includes in particular any type of existing or to be created preferably at least partially horizontally running channels in a body, in particular earth channels including earth drilling, rock drilling or earth lines as well as underground or above-ground pipelines and water channels, which can be produced or drawn in by using an appropriate earth boring device.

The term "drill pipe" as used in the description includes any means that can be introduced into the ground in order to make a borehole in the ground. The drill rod can in particular have a rod, a chain and/or a cable. The term "drill rods" in the sense of the description does not exclusively include rigid drill rods having individual rod sections connected directly or indirectly to one another, but in particular all power transmission elements that can be used in an earth drilling device. Furthermore, the drill rod assembly, in particular at a front end, can comprise a drill head and/or a drill head tip that may be present or an area adjacent to the drill head that is configured as a drilling tool or has it.

The term "drilling rig" includes a particularly mobile frame on which a carriage for moving the drill string can be provided, which can be moved back and forth in the direction of the drill string axis in order to push or pull the drill string in the ground. The carriage can be moved relative to the drill carriage using a linear drive. The drill carriage can also have one or more clamping devices, via which the drill rod or a rod section to be attached can be fixed. It can be provided that a clamping device is provided on the drill mast, by means of which the free end of the drill rod (the end protruding from the ground) can be fixed in order to enable a new rod section to be connected to the drill rod that has already been drilled.

A receptacle is provided on the carriage, which can accommodate a new rod section to be added or removed, in particular at the end, in such a way that the receptacle fixes the rod section in a non-positive and/or positive manner in order to be able to drive the rod section, in particular rotating it about its longitudinal axis . The receptacle can, for example, be designed in such a way that the receptacle comes into engagement at the end with a rod section that is to be loosened or screwed on, and a form fit is produced. If the recording is rotated, the rod section recorded by the recording can be rotated.

In the context of the description, the term "position" of the receptacle or a section of rod includes, in particular, the position of the receptacle or section of rod as specified by the movement along the drill rig, with the position being able to change in particular in that the Recording located rod section bolted to the drill rod and the recording or unscrewed from this can be. In essence, a change in position is thus a translational movement of the receptacle along the drill string axis. The change in the position of the recording to be screwed or loosened rod section corresponds to the change in the position of the recording to the drill rod drilled.

The invention describes the fact that a carrier carrying the receptacle is slidably arranged on the carriage and can be fixed on the carriage. The carriage can thus have a substructure relative to which the carrier can be displaced. By means of the carrier, which carries the receptacle, an optional fixation with the carriage/substructure or an optional fixation in relation to the carriage/substructure can be achieved. If the carrier is fixed relative to the carriage/substructure, the carriage/substructure and carrier can move together. If the fixation between the carrier and the carriage is selectively released, a relative movement between the carrier and the carriage can take place, with the result that the receptacle carried by the carrier can move relative to the carriage. While the carriage remains frictionally connected to the drive that drives the carriage, the receptacle can be moved with the carrier. The direction in which the carrier can be displaced in relation to the carriage is aligned essentially in the direction of the drill rod or offset parallel to it.

In a preferred embodiment, the carrier can be fixed to the carriage by means of a bolt, which can be actuated, in particular, hydraulically. As a result, a particularly simple configuration can be achieved. A bolt on the carrier or carriage/substructure can move into a corresponding recess in the other of the two elements of the carrier and carriage. In particular, a form fit can be formed between the carrier and the carriage in such a way that this form fit acts transversely to the direction in which the carrier can be displaced relative to the carriage/substructure. The form fit is preferably formed in a direction which, very particularly preferably, forms an angle with the direction of displacement between the carrier and the carriage/substructure of more than 50°, in particular more than 60°, in particular more than 70°, in particular more than 80° has 90°. Alternatively or additionally, a frictional connection can also be provided.

In a preferred embodiment, there is a sensor for detecting the end of the screwing process, the signal from which can be received by a control device in order to fix the receptacle to the carriage. In this way, the introduction of the earth drilling device can be controlled largely automatically. If the sensor has detected the end of the screwing process, a signal which the sensor makes available to the control device can be used to indicate to the control device that fixing is to be carried out again can. In particular, if a carrier is provided, the carrier can be fixed again on the carriage/substructure.

The term "control device" in the sense of the description encompasses an embodiment of a controller, by means of which a directed influencing of the earth drilling device during operation, i.e. while carrying out or for starting or stopping an earth drilling, is possible. In particular, the control device can be configured electrically or electronically. Inputs and/or parameters entered by an operator for carrying out the drilling can be used by the control device—if necessary converted and/or processed into electrical signals—as inputs for the operation of the earth drilling device. The earth drilling device can thus be operated or controlled by means of an input, in particular a parameter that may have been converted into an electrical signal.

A “parameter” in the sense of the description is understood to mean an input with which the operation of the earth drilling device can be influenced in a targeted manner. The parameter can be transmitted to the control device as an input signal, by means of which the control device controls the operation of the earth drilling device. A parameter can cause, for example, starting drilling with the earth drilling device or stopping drilling carried out with the earth drilling device.

In a preferred embodiment, the sensor can be a limit switch, a proximity switch, a position switch or the like. In a preferred embodiment, the receptacle is automatically or semi-automatically fixed to the carriage/substructure by means of a signal from a sensor. The sensor can detect the position of the receptacle and/or a carrier that may be present. Alternatively or additionally, a pressure sensor can be provided, which detects an increase in pressure in the hydraulic drive of the rotation for recording when the threads are closed or moved to the stop.

In a preferred embodiment, an input device is provided which supplies a signal which can be received by a control device in order to achieve fixing of the drive means to the carriage/base. As a result, the possibility can be created that an operator can manually fix the receptacle to the carriage/substructure. An operator monitors the process of adding or removing the last rod section on the drill rod.

The term "input device" in the context of the description includes any electrical or electronic device that is suitable for converting an input from an operator into an electrical signal. The electrical signal can be processed without further processing or transmitted to the control device with the interposition of a processing of the signal, in particular a processing in one or more circuits, for example in an amplifier, in order to serve as an input or as an input signal of the control device. The input device can be understood as an interface between an operator and the control device. The input device can in particular be a keyboard, a joystick, a microphone, a switch, a push button or the like.

The invention also provides a method for drilling in soil by means of a drill string, wherein a translationally movable carriage is used for pulling and/or pushing the drill string. A receptacle is arranged on the carriage, with which a rod section is screwed to or unscrewed from a drill rod. The receptacle is moved in a translatory manner relative to the carriage to compensate for a change in the position of the receptacle caused by the screwing.

The invention will be described in terms of two aspects relating to an earth boring device and a method for boring in soil. The explanations on the individual aspects complement one another, so that the explanations for the earth drilling device are also to be understood as explanations of the description for the method and vice versa. The description of the earth drilling device also discloses actions in the sense of the method or method steps relating to the method and vice versa.

For the purpose of the description, the naming of a numerical value, in particular an indication of an angle, not only includes the actual numerical value, but also - in order to take into account production tolerances in particular - a range around the specific numerical value, which is +/-15%, preferably +/-10% , can be of the specified numerical value.

The above statements, like the following description of exemplary embodiments, do not represent a waiver of certain embodiments or features.

The invention is explained in more detail below using an exemplary embodiment illustrated in the figures.

Fig. 1

eine Seitenansicht einer Erdbohrvorrichtung in schematischer Darstellung;

Fig. 2

einen Schlitten einer Erdbohrvorrichtung vor dem Anschrauben eines Gestängeschusses an ein schon verbohrtes Bohrgestänge; und

Fig. 3

einen Schlitten einer Erdbohrvorrichtung nach dem Anschrauben eines neuen Gestängeschusses an das schon verbohrte Bohrgestänge.

In the drawings shows:

1

a side view of a Erdbohrvorrichtung in a schematic representation;

2

a carriage of an earth boring device prior to bolting a drill section to an already drilled drill string; and

3

a carriage of an earth boring device after screwing a new rod section to the already drilled rod.

1 shows a ground drilling device 1 in a schematic representation from the side, which works in a soil-displacing manner. By means of the earth drilling device 1, a drill rod, which has rod sections 5, can be introduced into the ground in a translatory and rotary manner. For this purpose, a carriage 4 can be moved back and forth on a drill carriage 2 . The drill carriage 2 defines a drill rod axis 7 with the carriage 4 or a receptacle 3. The receptacle 3 is designed on the carriage 4 in the form of an adapter or connection, by means of which a new rod section 5 to be connected is connected to the drill rod that has already been drilled and then can be placed in the ground.

The rod sections 5 are screwed together. For this purpose, corresponding threads that interact with one another are provided on the rod sections 5 at the ends. The receptacle 3 forms a form fit with the rod section 5 to be connected to the drill rod that has already been drilled. The rod section 5 is screwed to the bored drill rod and the receptacle 3 and then the carriage 4 is moved in the direction of the drill rod axis 7 on the drill carriage 2 .

the 2 shows a schematic view of the state before the receptacle 3 is connected to the rod section 5. The carriage 4 has the receptacle 3, which is firmly connected to a carrier 9 with this. The receptacle 3 is fixed to the carrier 9 in the direction of the drill rod axis 7 . The receptacle 3 can rotate, but cannot be moved relative to the carrier 9.

The receptacle 3 can be displaced relative to a substructure 8 of the carriage 4, with the carrier 9 being able to be fixed relative to the substructure 8 as desired. For this purpose, a form fit between a bolt 10 and a receiving bore 12 is provided. The bolt 10 is designed as a displaceable bolt on the carrier 9 . The bolt 10 is part of a locking device 6. The bolt 10 can be moved in and out by means of a hydraulic cylinder 11. in the in 2 The position shown is that the carriage 4 is in a rear position on the drill carriage 2 and has moved onto a rod section 5 that is to be screwed to a drill string that is already in the ground. The carrier 9 has shifted backwards in relation to the substructure 8 in the opposite direction to the drilling direction. By subsequently screwing the mount 3 onto the new rod section 5 and screwing on the new rod section 5 to a drill string not shown that is already in the ground, the carrier 9 is pulled forward on the substructure 8 . The bolt 10 is in the retracted state during the screwing process, as shown in 2 is shown.

If both threads of the new rod section 5, ie both the front thread with the drill rod that has already been drilled and the rear thread with the receptacle 3, are completely screwed, the carrier 9 is in a 3 shown front position. In this position of the carrier 9 relative to the substructure 8, the bolt 10 can move into the receiving bore 12 of the substructure 8 and now prevents relative movement between the substructure 8 and the carrier 9. In this constellation, the drilling process is now continued immediately; the carriage 4 can be moved as a whole, so that the carrier 9 and the substructure 8 can be moved together. A closing of the carriage 4 or substructure 8 until the carrier 9 hits the stop 13 can be avoided. If the new rod section 5 has been drilled into the ground with the drill rod that has already been drilled, the bolt 10 can retract and the carrier 9 can move back with the receptacle 3 and the process of connecting a new rod section 5 to the drill rod that has been drilled can begin again.

Claims (8)

1. Ground drilling device (1) for drilling in soil by means of a drill string, wherein the ground drilling device (1) has a drilling carriage (2) and a sled (4) movable in translational motion on the drilling carriage (2), and a holder (3) is arranged on the sled (4)

   a) for the screwing connection of a rod section (5) to the drill string, or

   b) for the screwing detachment of a rod section (5) from the drill string, wherein the holder (3) can move in translational motion relative to the sled (4) characterized in that a support (9) bearing the holder is displaceably arranged on the sled (4), which is optionally detachably fixed on the sled (4) to compensate for a change in the position of the holder (3) caused by the screwing.
2. Ground drilling device (1) according to claim 1, characterized in that the support (9) can be fixed to the sled (4) or to a substructure (8) of the sled (4) by means of a bolt (10) which more particularly is hydraulically actuatable.
3. Ground drilling device (1) according to claim 1 or 2, characterized in that a sensor is provided to detect the end of the screwing process, the signal from which can be received by a control device to ensure fixing of the holder (3) to the sled (4).
4. Ground drilling device according to claim 3, characterized in that the sensor can be a limit switch, a proximity switch, position switch or similar.
5. Ground drilling device (1) according to one of the claims 1 to 4, characterized in that an input device is provided which supplies a signal which can be received by a control device to ensure fixing of the holder (3) to the sled (4).
6. Method for drilling in the soil using a drill string, wherein a sled (4) which can be moved in translational motion is used for pulling and/or pushing the drill string, and on the sled (4), a holder (3) is arranged with which a rod section (5) is screwed onto or unscrewed from a drill string, wherein the holder (3) can be moved in translational motion relative to the sled (4), characterized in that the holder (3) is optionally detached from the sled (4) to compensate for a change in the position of the holder (3) caused by the screwing.
7. Method according to claim 6, characterized in that an input device, which can be actuated by an operator, is provided and the holder (3) is optionally fixed to the sled (4) by means of an input on the input device.
8. Method according to claim 6 or 7, characterized in that the holder (3) is optionally fixed to the sled (4) by means of a signal from a sensor.

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