Drill drive arrangement, multiple rotary drive arrangement, and drilling rig for civil engineering, as well as method for operating a drill drive arrangement for civil engineering

Abstract

The invention relates to a drilling drive arrangement (80) for driving a drilling tool (34) for the civil engineering, with a rotary gearbox (41) that has at least two gearbox inputs each for inputting an input torque and is configured to add the input torques and provide them as an output torque at a gearbox output (49) for driving the drilling tool (34), wherein a drive motor unit (42, 43) for generating and providing a motor torque as input torque for the rotary gearbox (41) is mounted or mountable on each of the at least two gearbox inputs and at least one of the mounted drive motor units (42, 43) has a hydraulic motor. At least one of the mounted or mountable drive motor units (42, 43) has an electric motor.

Description

[0001] The invention relates to a drill drive arrangement, a multiple rotary drive arrangement, and a drilling rig for civil engineering, as well as a method for operating a drill drive arrangement for civil engineering.

[0002] Drill drive arrangements or working devices for driving tools in common drilling and / or mixing applications for civil engineering (Kelly drilling, continuous flight auger or full displacement drilling, multiple or double-head drilling methods, soil mixing methods) are known in various sizes, power classes, and designs.

[0003] Kelly drilling is a drilling method with which foundation elements can be produced that may have a depth greater than the length of the drilling tool used. Torque and crowd force are transmitted via a telescopic Kelly bar from a drilling drive to the tool. The borehole wall can be supported by a suspension or an additional drilling or casing tube. The installation of the casing tubes is carried out with the aid of the drilling drive or an attached casing system. The Kelly drilling method can be performed in all soil types, including rock. Depending on the subsurface conditions, different drilling tools are used. The diameters in this method typically vary between 400 mm and 3,000 mm with drilling depths between 10 m and 100 m, wherein deviating diameters and depths are possible.

[0004] The uncased (CFA) or cased continuous flight auger drilling method (CCFA) can be used in particular for the production of overlapping bored pile walls.

[0005] In full displacement drilling (FDP), displacement piles are produced, wherein these are cast-in-place concrete piles where a displacement drilling head is screwed and pressed into the ground using a rotary drilling rig. Prerequisites for its use are modern rotary drilling rigs with high torque, large crowd and pullback forces, as well as a tall, torsionally stiff drilling mast.

[0006] In the multiple or double-head drilling method, a drilling system is used that has drilling tools coordinated with each other and enables the simultaneous drilling of a drilling tool and a casing. One rotary drive provides the rotational movement of an outer tube and another rotary drive provides a rotational movement of an internal linkage or drilling tool, preferably in opposite directions of rotation.

[0007] In the soil mixing method, a special mixing tool is sunk into the ground, consisting of a single or multiple drill string, paddles, and a drill head. Drilling-in and extracting the mixing tool is assisted by the addition of a binder suspension that exits from nozzles at the end of the drill head or respectively along the paddles. The mixing tool is moved up and down to improve the homogeneity of the soil mixture.

[0008] Although a mixing tool in the strict sense does not always have to have a drill head, the following will always refer to drilling tools, and the invention is also described with reference to a drilling rotary drive. It is expressly pointed out, however, that the inventive drill drive arrangement, in the sense of a rotary drive arrangement in a broader sense, is also intended to be disclosed for the rotary drive of purely mixing tools and can be used in the field of civil engineering.

[0009] For the aforementioned civil engineering methods, suitable drilling drive arrangements of the generic type have a mechanical rotary gearbox which, for example, has two gearbox inputs each for the parallel introduction of an input torque and is configured to add the input torques and provide them as an output torque at a gearbox output for driving the respective drilling tool. Respectively one drive motor unit for generating and providing a motor torque as input torque for the rotary gearbox is mounted at each of the two gearbox inputs. Usually, the drive motor units used on a drilling drive arrangement are those that use a hydraulic motor as the drive source. The most common construction type is based on hydraulic motors, because these can provide the required drive torques and most carrier machines for civil engineering have a corresponding onboard hydraulic supply, since hydraulic motors are also used for a variety of different attachment tools for the carrier machines such as vibrators, hammers, rotary drilling drives, or trench cutters.

[0010] Certain methods, such as soil mixing methods, where besides creating the borehole, still mixing energy must be applied in the borehole to form a soil mortar, or hard grounds require particularly high power that can exceed the capacity of a drilling drive arrangement or respectively a standard working device or standard drilling rig.

[0011] The reasons for a performance limitation in drilling can be:

[0012] the installed drive power of the drilling drive arrangement or respectively the working device is too low (e.g. number / size of motors or an insufficient allowable operating pressure of the hydraulic motors);

[0013] the power of the hydraulic unit, i.e. for example a diesel engine for driving the hydraulic pump for the hydraulic motors, is too low; and

[0014] the maximum transferable power of the hydraulic system of the onboard hydraulic supply of the drilling rig (number / size of hydraulic pumps and / or valve and line technology and / or maximum possible system pressure) is too low.

[0015] To compensate for such power deficits, an obvious approach is to initially provide for the installation of at least one additional hydraulic motor on the rotary gearbox of the drilling drive arrangement or respectively the working device. However, this has the consequence that either the hydraulic system and the primary drive of the drilling rig on which the working device is to be employed must be expanded, or an external hydraulic power pack must be connected to the working device or the drilling rig. The first measure has the disadvantage that it requires an intervention in the existing machine or the use of a larger and more powerful base machine. A larger carrier machine, however, operates with lower efficiency under low power demand, is also more expensive than a smaller carrier machine, and thus is uneconomical in use if the available power is not needed. The second measure leaves the carrier machine itself largely untouched, but due to the additional external hydraulic unit it leads to disadvantages in handling and, at least in the case of diesel-driven units, to additional noise and CO2 emissions on site.

[0016] The object of the invention is to specify a drilling drive arrangement, a rotary drive arrangement and a drilling rig for civil engineering, as well as a method for operating the same, with which, despite an increase in power, an especially economical, efficient, and environmentally friendly operation of the drilling drive arrangement is made possible.

[0017] This object is achieved on the one hand by a drilling drive arrangement for civil engineering having the features of claim 1, on the other hand by a multiple rotary drive arrangement having the features of claim 12, by a drilling rig for civil engineering having the features of claim 13, and by a method for operating a drilling drive arrangement for civil engineering having the features of claim 14. Preferred embodiments are specified in the respective dependent claims.

[0018] Accordingly, the inventive drilling drive arrangement for driving a drilling tool for civil engineering comprises a rotary gearbox which has at least two gearbox inputs each for inputting an input torque and is configured to add the input torques and provide them as an output torque at a gearbox output for driving the drilling tool, wherein a drive motor unit for generating and providing a motor torque as input torque for the rotary gearbox is or can be mounted at each of the at least two gearbox inputs, and at least one of the mounted drive motor units has a hydraulic motor. The drilling drive arrangement according to the invention is characterized in that at least one of the drive motor units mounted or mountable on the gearbox inputs of the rotary gearbox has an electric motor.

[0019] A fundamental idea of the invention resides in that, on the one hand to upgrade performance-wise a drilling drive arrangement, i.e, in particular an working device, having one or more hydraulic drive motors, by applying at least one additional electric drive motor for an additional parallel torque input into the rotary gearbox and thereby essentially hybridizing it, and to supply the energy required for the additional drive motor (i.e. electrical energy) from an alternative source.

[0020] The output power of the electric motor can be directly converted at the drilling drive arrangement and provided as output torque at the gearbox output of the rotary drive. The electrical power supply of the at least one additional electric drive motor can be realized, for example, by a supply from an electrical energy source or voltage source of the construction machine (generator, battery pack) or an external electrical energy source or respectively voltage source with a cable connection to the construction machine, which likewise can be a generator, a mains connection, or a battery pack.

[0021] One variant of the drilling drive arrangement can even be designed such that at least two gearbox inputs are provided, and the hydraulic motor for the base operation is mounted on one of the gearbox inputs, while the other gearbox input is merely prepared or configured and kept available for the optional attachment of the electric motor and for the hybridization. This implies the necessary technical measures that enable the optional equipment of the drilling drive arrangement with the electric motor when needed. The attachment position for the electric motor on the rotary gearbox can—so long as it is not yet attached—be closed off with a removable cover. Of course, if the number of gearbox inputs is correspondingly increased, also multiple hydraulic motors can be mounted and one or more gearbox inputs can be provided for the optional attachment of one or respectively more electric motors.

[0022] Besides the fundamental increase of the maximum available power at the rotary drive, according to the invention further advantages results:

[0023] a smaller or less powerful base machine can be sufficient for many applications, and a higher power demand that is only rarely required can be covered by electrical energy without needing a more powerful and thus more expensive base machine (in the above variant, the electric motor can even be attached to the gearbox input being for this provided, firstly as part of the setup works);

[0024] power peaks can be provided solely by the drilling drive arrangement and a simple external electrical power supply without complex modifications of the base machine or respectively of the hydraulic system on site or the use of an alternatively larger base machine, since a so-called “construction site power” is approximately available at almost all construction sites;

[0025] in the different load ranges of a work process, the drive motor being best suited due to its performance characteristics, or respectively a combination of drive motors, can be used selectively to provide the required torque. In a partial load range, for example, the drive can preferably be carried out with the relatively easily modulated electric motor, i.e. the power of the electric motor can first be increased stepwise or continuously and the at least one hydraulic motor can only then be “switched on” when the application requires even higher power or respectively torque (the control can conversely also take place whilst the hydraulic motor(s) provide(s) a base load and the electric motor(s) is / are switched on when a load limit of the hydraulic system is reached);

[0026] by using the environmentally friendly electric motor, the energy contribution of the diesel engine to the work process can be reduced, resulting in a reduction of (local) CO2 emissions and also noise. When a low torque is needed, operation can be purely hydraulic or purely electric, for example when cleaning the drilling tool.

[0027] The term “switched on” for the hydraulic motor when the electric motor is primarily driving is not to be understood in practice to mean that the hydraulic motor initially stands still and is then, for instance, engaged. A technically more practical solution is one in which an output rotational speed of the drilling drive is dictated by an oil flow and thus in fact by the hydraulic motor(s). The electric motor is operated in torque control. The specified torque is adjusted accordingly to the hydraulic pressure, since the electric motor torque must be limited in such a manner that a certain minimum pressure (for example 10 bar) is given. This causes, simply put, a torque-free co-rotation of the hydraulic motors. This can prevent the electric motor(s) from “hauling up” the hydraulic motor(s) and driving them as pumps, which would pose the risk of cavitation. This case occurs during free spinning or when the drilling torque is so low that the maximum electric motor torque is not utilized. If the drilling torque increases as a result of the process, the control described above causes the electric motor torque to rise, up to its maximum torque. If the drilling torque increases further, a pressure increase in the hydraulic system occurs. This then, from an external perspective, appears as if the hydraulic motor is being “switched on.”

[0028] Preferably, a control device is provided for the drilling drive arrangement that is configured to variably control the operation of the at least one drive motor unit that has the hydraulic motor and the at least one drive motor unit that has the electric motor, and thereby their respective contributions to the output torque, preferably in dependence on a torque demanded at the gearbox output. Such a control device can be integrated into a control unit of the drilling rig on which the drilling drive arrangement is operated, or it can be implemented as an independent control unit, which in turn can be arranged entirely or partially on the drilling drive arrangement. Integrating the control functions for both types of drive motors allows selective and coordinated actuation of the motors depending on the torque requirement at the tool.

[0029] For example, a control unit with the power electronics for the at least one drive motor unit that has the electric motor can be arranged on the drilling drive arrangement. This can significantly shorten the cable lengths between the power electronics and the electric motor, which reduces losses and increases efficiency and safety in operation.

[0030] The control device can further be configured to always supply the at least one drive motor unit that has the hydraulic motor with a minimum hydraulic pressure during operation of the drilling drive arrangement, to prevent the hydraulic motor from running empty of hydraulic fluid or liquid when this is not substantially required for drive in certain phases of the operation but is “dragged along” via the engagement with the rotary gearbox by the drive of the electric motor(s) and works as a pump (see the explanation above).

[0031] The control device can further be configured to control the at least one drive motor unit that has the electric motor in a torque-controlled / torque-regulated manner. The required drilling or rotational torque is usually detected in the drilling rig, and this information can be used as input for the control device.

[0032] Preferably, the electric motor of the at least one drive motor unit that has the electric motor is designed as a permanently excited synchronous machine. In contrast to an electrically excited synchronous machine, for this type of electric motor the current or voltage supply for excitation is omitted, through which the machine is simpler, more cost-effective, and more robust.

[0033] The drilling drive arrangement can have its own cooling unit assigned to the electric motor and / or, if present, the control unit with the power electronics for actively dissipating operational heat, wherein the cooling unit has a liquid cooling and a heat exchanger / radiator of a cooling circuit of the cooling unit is preferably carried on the drilling drive arrangement. One advantage of relocating the cooling unit to the drilling drive arrangement is that the line lengths for transporting the cooling medium are shortened and do not have to be routed to and from the construction machine. The energy required to operate the cooling unit, to provide a pumping power in the cooling circuit, can be branched off in a short path from the electrical power supply for operating the electric motor.

[0034] The cooling unit can thus, in particular be designed to work autonomously, especially independently of a cooling circuit of a drilling rig on which the drilling drive arrangement is used. The cooling of the components of the additional electric motor being relocated from the drilling rig to the drilling drive arrangement, and possibly operating autonomously, allows the drilling drive arrangement to be used even with drilling rigs that themselves are not equipped with equipment for operational cooling of external components or working devices and significantly expands the spectrum of applications.

[0035] The drilling drive arrangement can have a connection for an external supply of the at least one drive motor unit that has the hydraulic motor, with hydraulic fluid, and a connection for an external supply of the at least one drive motor unit that has the electric motor, with electrical energy. This allows the drilling drive arrangement, which sits on a feed carriage that is held or moved either by a feed cylinder or a feed rope, to be easily supplied with the operating media required for operation.

[0036] To extend the control range of the torque provided at the output of the rotary drive, at least one of the drive motor units can have an integrated reduction gear with fixed or switchable transmission ratio and preferably a switchable idle stage or clutch. In particular, the switchable idle stage or clutch allows the respective drive motor unit that is not needed, to be completely uncoupled from the rotary gearbox, so that even when the other drive motor unit is operating, it is not “dragged along” and does not cause any losses due to friction or resistance or -in the case of the hydraulic motor-does not work as a pump and leading to an undesired backflow of hydraulic fluid and the hydraulic motor running empty of hydraulic fluid or liquid of the hydraulic motor.

[0037] In a configuration of the drilling drive arrangement, particularly preferred for civil engineering, the gearbox output can have a drive hollow shaft or driver sleeve for detachable coupling and driving of a drill string as part of the drilling tool to be driven, in particular a Kelly bar. Moreover, the drive hollow shaft or driver sleeve can be interchangeable to adapt the design (for example, the inner diameter and / or form-fitting drivers) for use with different types of Kelly bars.

[0038] The drilling drive arrangement can finally include a drilling drive carriage which is configured to be slideably supported along a mast of a drilling rig for civil engineering, wherein the rotary gearbox and possibly further components such as the cooling unit or the control unit, if provided, is / are mounted on the drilling drive carriage. The arrangement of these components on the drilling drive carriage facilitates on-site commissioning, in that only the drilling drive carriage as a functional unit needs to be attached to the mast of the drilling rig and the supply lines for the operating media (electrical energy, hydraulic fluid) need to be connected.

[0039] In a further development, the invention also relates to a multiple rotary drive arrangement, i.e. a working device with at least two drilling drive arrangements that can be operated independently of each other and controlled independently of each other in a fixed assembly assignment, wherein at least one, preferably two of the drilling drive arrangements is / are designed according to the invention, i.e. is / are hybridized or capable of being hybridized. The individual drilling drive arrangements thus each have an own rotary gearbox each having one or more hydraulic drive motors, wherein by applying or activating at least one additional electric drive motor on one of the drilling drive arrangements or on multiple of the drilling drive arrangements, an additional parallel torque input into the respective rotary gearbox can this upgrade it in terms of power and thus essentially hybridizing it, and on the other hand the energy required for the additional drive motor(s) (i.e. electrical energy) can be supplied from an external source.

[0040] In this case, depending on the power or torque requirement, the electric motor(s) can be selectively installed and / or switched on, on none, only one, or on both (or further) of the at least two drilling drive arrangements. An examplary application of this multiple rotary drive arrangement is a working device known per se by which, using the drilling drive arrangements, a drilling tool and a concentric casing are simultaneously driven in rotation, preferably in opposite directions, wherein the invention offers the advantage when a ground is hard, more power can be assigned to the drilling drive, whereas when the ground is soft, more power is allocated to the casing drive because this must be inserted more quickly to keep up with the drilling progress. Moreover, with the multiple rotary drive arrangement, the advantages described above with reference to the simple drilling drive arrangement can be realized correspondingly, even if only one of the drilling drive arrangements is designed according to the invention, i.e. is hybridized or capable of being hybridized.

[0041] The invention also relates to a drilling rig for civil engineering, with a carrier machine, which is preferably configured as mobile with an undercarriage, a mast arranged on the carrier machine, and a drilling drive carriage which is supported so as to be movable in particular along the mast, wherein an inventive drilling drive arrangement or multiple rotary drive arrangement is arranged on the drilling drive carriage.

[0042] Finally, the invention also relates to a method for operating an inventive drilling drive arrangement for civil engineering, that is characterized in that the operation of the at least one drive motor unit that has the hydraulic motor and the at least one drive motor unit that has the electric motor, and thus their respective contribution to the output torque, is controlled variably, preferably in dependence on a rotational torque demanded at the gearbox output.

[0043] In the method, furthermore, the at least one drive motor unit that has the hydraulic motor can always be supplied with a minimum hydraulic pressure during operation of the drilling drive arrangement, to prevent the hydraulic motor from running empty when it is not needed to provide a drive torque, but, for example, cannot be completely decoupled from the rotary gearbox in terms of drive by a clutch or idle stage.

[0044] With the drilling rig and respectively the method, the advantages and effects explained in connection with the drilling drive arrangement can be achieved correspondingly.

[0045] The invention is explained in more detail below with reference to preferred exemplary embodiments, which are schematically illustrated in the drawings. In the drawings show:

[0046] FIG. 1: a side view of a drilling rig with an inventive drilling drive arrangement; and

[0047] FIG. 2: a perspective view of a rotary drive of a drilling drive arrangement according to the invention, mounted on a drilling drive carriage.

[0048] An inventive drilling drive arrangement 80, mounted on a mobile carrier machine 12 as an example for a drilling rig 10, is shown in FIG. 1. The carrier machine 12 preferably can comprise a crawler undercarriage as a lower carriage 14, on which an upper carriage 16 can be mounted, in particular rotatably. In an operator's cab of the upper carriage 16, a control unit 60 can be located, with which functions of the carrier machine 12 and the drilling drive arrangement 80 can be controlled. In particular, via a link mechanism 18, a mast 20 can be mounted on the upper carriage 16, preferably adjustably, which in operation can have a substantially vertical position.

[0049] In the illustrated exemplary embodiment, the mast 20 can be preferably designed as a leader 21 with a linear guide 24 on its front side. Along the linear guide 24, for example, a drilling drive carriage 38 with a rotary drive 36 can be supported so as to be movable vertically. This allows the drilling rig 10 to be executed as a civil engineering machine. In the drawing, a middle position of the rotary drive 36 is shown, as well as a lower position indicated with dashed line guidance.

[0050] Via a mast head 22 at the upper end of the mast 20, a cable 40 can be guided, at one end of which a preferably telescopic Kelly bar 32 with an examplary drilling tool 34 can be provided to form a civil engineering tool 30. The Kelly bar 32 can be guided through a ring-or sleeve-shaped drive hollow shaft 48 of the rotary drive 36 on the drilling drive carriage 38, so that a torque from the rotary drive 36 can be transmitted in a form-fitting manner, for example via drivers 54 to non-illustrated driver strips of the Kelly bar 32. At the lower end of the Kelly bar 32, the drilling tool 34 for creating a borehole in the ground can be arranged. The drilling tool 34 can fundamentally be of any design and, in particular can have an auger or a drilling bucket.

[0051] From the Kelly bar 32, the cable 40 can be guided over deflection pulleys 26 at the mast head 22 along the mast 20 up to a cable winch 46 in or on the upper carriage 16. The winch 46 is driven by a motor 50. Using the winch 46, the Kelly bar 32 with the drilling tool 34 can be raised and lowered by means of the cable 40.

[0052] Via an adjustment drive 28 with a winch on the mast 20, the drilling drive carriage 38 with the rotary drive 36 can be pulled upward by another adjustment cable 29. By correspondingly driving the adjustment drive 28 in the opposite direction, the drilling drive carriage 38 with the rotary drive 36 can also be lowered or pulled or respectively pushed downward. The adjustment drive 28 can be equipped with a hydraulic or electric motor (not shown), or can be designed as a hydraulic drive with adjustment cylinder(s).

[0053] In the illustrated exemplary embodiment, a force measuring device 62 is arranged preferably on a pulley 26 at the mast head 22. The force measuring device 62 can, for example, be designed as a force measuring pin by which a rope tension in the cable 40 can be detected. The force measuring device 62 is in communication with the control unit 60 on the upper carriage 16.

[0054] Via the control unit 60, the at least one motor 50 for driving the cable winch 46, the adjustment drive 28, and preferably also the later still described drive motors for driving the rotary drive 36, are actuated.

[0055] FIG. 2 shows a perspective view of a rotary drive 36 of a drilling drive arrangement 80 according to the invention for driving a drilling tool 34 in a rotating manner, which is connected, for example by bolts to a drilling drive carriage 38 that is movable along a mast 20.

[0056] The rotary drive 36 comprises a known annular rotary gearbox 41 that has at least two gearbox inputs each for the parallel introduction of an input torque, and is configured with a gear assembly to add the individual input torques and provide them as a combined total output torque at a gearbox output 49 for driving the drilling tool 34. A drive motor unit 42, 43 for generating and providing a motor torque as input torque for the rotary gearbox 41 is connected at each of the at least two gearbox inputs, wherein at least one drive motor unit 42 has a hydraulic motor and at least one drive motor unit 43 has an electric motor. In the example shown, two drive motor units 42 with hydraulic motors and one drive motor unit 43 with an electric motor are provided, wherein further drive motor units with hydraulic motor and multiple drive motor units with electric motor can be provided. The respective drive units 42, 43 are connected via flange connections to a housing 47 of the rotary gearbox.

[0057] The electric motor of the respective drive motor unit 43 is preferably designed as a permanently excited synchronous machine. Each of the drive motor units 42, 43 can, in a known manner, have an integrated reduction gear 55 between the motor and an output element engaging the rotary gearbox, with fixed or switchable transmission and preferably a switchable idle stage or clutch. Such a reduction gear can differ between electric motors and hydraulic motors.

[0058] The gearbox output 49 here is connected to a drive hollow shaft 48 for rotative driving of the drilling tool 34, wherein the drive hollow shaft 48 transmits the drive torque via drivers 54 in a form-fitting manner to a drilling tool not shown here (for example, the Kelly bar 32 shown in FIG. 1).

[0059] A ring-shaped spring pot 45 with springs 51 and hydraulic dampers 52, on whose support ring 53 a circumferential radial collar of the Kelly bar 32 can support, dampens vertical shocks during operation and protects the material.

[0060] The drilling drive arrangement 80 possesses a control device (not shown here) that is configured to variably control the operation of the drive motor units 42, 43 mounted on the rotary gearbox, and thereby their respective contribution to the output torque, preferably in dependence on a drilling or rotational torque requested at the gearbox output 49.

[0061] The control device is preferably configured to always supply the at least one drive motor unit 42 that has the hydraulic motor, with a minimum hydraulic pressure during operation of the drilling drive arrangement 80, to prevent the hydraulic motor(s) from running empty when it / they is / are not significantly required for drive in certain phases of operation, and possibly cannot be completely decoupled from the rotary gearbox.

[0062] Further, the control device is preferably configured to control the drive motor unit(s) 43 with the electric motor in a torque-guided / controlled manner.

[0063] The control device for the drive motor unit(s) 43 with the electric motor comprises also a control unit with power electronics. While the control device for the motors of the drilling drive arrangement can be integrated into the control unit 60 of the drilling rig 10, this control unit with the power electronics can be arranged as a separate functional unit on the drilling drive arrangement at a protected location and possibly in an own housing near the rotary drive, for example on the drilling drive carriage 38, in order to route the electric power for the electric motors over the shortest possible path.

[0064] The supply of the motors of the rotary drive (and possibly other components) with energy (hydraulic fluid under pressure as well as electrical energy) is effected via respective connections for an external supply, which enable a quick and secure detachable coupling with external feed lines.

[0065] The drilling drive arrangement 80 can further have a cooling unit which is assigned to the electric motor(s) and / or, if present, the control unit with the power electronics, for actively dissipating operational heat, wherein the cooling unit can be configured as liquid cooling and a heat exchanger / cooler, possibly with a fan. of a cooling circuit of the cooling unit can be preferably carried on the drilling drive arrangement 80, for example also on the drilling drive carriage 38. This cooling unit can, in particular be configured to operate autonomously, especially independently of a cooling circuit of the drilling rig 10 on which the drilling drive arrangement 80 is used.

Claims

1. A drilling drive arrangement for driving a drilling tool for civil engineering, comprising:a rotary gearbox comprising at least two gearbox inputs each for inputting an input torque, the rotary gearbox being configured to add the input torques of the at least two gearbox inputs together to make a total input torque and to provide the total input torque as an output torque at a gearbox output for driving the drilling tool;wherein a drive motor unit for generating and providing a motor torque for the rotary gearbox is mountable on each of the at least two gearbox inputs, including a first drive motor unit which is mounted and comprises a hydraulic motor; and a second drive motor unit which is mounted and comprises an electric motor.

2. The drilling drive arrangement according to claim 1,whereina controller is provided for the drilling drive arrangement which is configured to variably control an operation of the first drive motor unit that comprises the hydraulic motor and the second drive motor unit that comprises the electric motor, and thereby variably control their respective contribution to the output torque, responsive to a torque requested at the gearbox output.

3. The drilling drive arrangement according to claim 2,whereinthe controller is configured to always supply the first drive motor unit that comprises the hydraulic motor with a minimum hydraulic pressure during operation of the drilling drive arrangement.

4. The drilling drive arrangement according to claim 2,whereinthe controller is configured to control the second drive motor unit that comprises the electric motor in a torque-guided / controlled manner.

5. The drilling drive arrangement according to claim 1,whereinthe electric motor is a permanently excited synchronous machine.

6. The drilling drive arrangement according to claim 1,whereina controller with power electronics for the second drive motor unit that comprises the electric motor is arranged on the drilling drive arrangement.

7. The drilling drive arrangement according to claim 1,whereinthe drilling drive arrangement comprises a cooling unit for the electric motor for actively dissipating operational heat, wherein the cooling unit comprises a liquid coolant and a heat exchanger / cooler of a cooling circuit, and the cooling unit is carried on the drilling drive arrangement.

8. The drilling drive arrangement according to claim 7,whereinthe cooling unit is configured to work independently of a cooling circuit of a drilling rig on which the drilling drive arrangement is used.

9. The drilling drive arrangement according to claim 1,whereinthe drilling drive arrangement comprises a connection for an external supply of a hydraulic fluid for the first drive motor unit that comprises the hydraulic motor, and a connection for an external supply of electrical energy for the second drive motor unit that comprises the electric motor.

10. The drilling drive arrangement according to claim 1,whereinat least one of the drive motor units comprises an integrated reduction gear with a fixed or switchable transmission ratio and a switchable idle stage or clutch.

11. The drilling drive arrangement according to claim 1,whereinthe gearbox output comprises a drive hollow shaft for detachable coupling and driving of a drill string as part of the drilling tool to be driven.

12. A multiple rotary drive arrangement, comprising at least two drilling drive arrangements that are operable independently of each other and controlled independently of each other in a fixed assembly assignment, wherein at least one of the drilling drive arrangements is provided according to claim 1.

13. A drilling rig for civil engineering comprising:a carrier machine which is preferably configured to be mobile and has an undercarriage,a mast which is arranged on the carrier machine, anda drilling drive carriage which is supported so as to be movable along the mast, whereina drilling drive arrangement according to claim 1 is arranged on the drilling drive carriage.

14. A method for operating a drilling drive arrangement for civil engineering according to claim 1,whereinthe operation of the first drive motor unit that comprises the hydraulic motor and the second drive motor unit that comprises the electric motor, and thereby their respective contribution to the output torque, are controlled variably, responsive to a drilling or rotational torque requested at the gearbox output.

15. The method according to claim 14,whereinthe first drive motor unit that comprises the hydraulic motor is always supplied with a minimum hydraulic pressure during operation of the drilling drive arrangement to prevent the hydraulic motor from running empty.

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