Drill drive assembly for civil engineering and method for operating a drill drive assembly for civil engineering

Abstract

The invention relates to a drilling drive arrangement (80) for civil engineering, comprising a drilling drive carriage (38) which is slidably mounted along a mast (20) of a drilling rig (10) for civil engineering, wherein at least one rotary drive (36), designed as an electric motor (84), is arranged on the drilling drive carriage for rotating a drilling tool (34) for drilling into soil. According to the invention, a control unit (88) for controlling the at least one electric motor is provided, comprising a drilling mode for drilling the drilling tool into the soil while removing soil material and a removal mode for removing soil material from the drilling tool. In the removal mode, the current and / or voltage for the electrical power supply of the at least one electric motor are automatically controlled such that the drilling tool repeatedly performs a rotation-stop movement with or without reversing the direction of rotation.

Description

[0001] The invention relates to a drilling drive arrangement for civil engineering, comprising a drilling drive carriage which is slidably mounted along a mast of a drilling rig for civil engineering, wherein at least one rotary drive, designed as an electric motor, is arranged on the drilling drive carriage for rotating a drilling tool for drilling in soil, according to the preamble of claim 1.

[0002] The invention further relates to a method for operating a drilling drive arrangement for civil engineering with a drilling drive carriage which is slidably mounted along a mast of a drilling rig for civil engineering, wherein at least one rotary drive which is designed as an electric motor is arranged on the drilling drive carriage for rotating a drilling tool for drilling soil, according to the preamble of claim 12.

[0003] Electrically powered construction machinery has been around for some time and is used particularly in workplaces where noise, vibration, and exhaust fumes are undesirable. These harmful factors can occur, for example, with construction machinery powered by combustion engines. Due to the high energy demands of such electrically powered construction machinery, it often has a power supply system for drawing electrical energy from an external power source, especially an electrical grid. This requires the installation of a suitable electrical line.

[0004] Furthermore, electrically operated civil engineering machines are regularly equipped with a rechargeable battery unit, which serves in particular to supply the mobile civil engineering machine with sufficient electrical energy during movement or transport, in which the electrical connection is frequently interrupted.

[0005] For the efficient operation of the excavation machine, a demand-based distribution of energy to the machine is essential. EP 4 245 923 B1 discloses an electrically operated excavation machine with a drilling drive assembly and an intermediate circuit for the demand-based distribution of electrical energy. The intermediate circuit is designed as an electrical conductor to which consumption units, in particular a battery unit and an electric motor, are connected. This ensures that electrical energy is efficiently supplied to the drilling drive assembly, especially to an electric motor, during operation of the excavation machine. Electrical energy can be supplied from the intermediate circuit to an electric motor via an inverter unit, which is designed to feed energy back into the intermediate circuit during a recuperation mode of the electric motor.

[0006] The invention is based on theAufgabe The aim is to specify a drilling drive arrangement for civil engineering and a method for operating it, which enables a particularly economical and efficient operation of the drilling drive arrangement.

[0007] The problem is solved, firstly, by a drilling drive arrangement for civil engineering with the features of claim 1, and secondly, by a method for operating a drilling drive arrangement for civil engineering with the features of claim 12. Preferred embodiments are specified in the respective dependent claims.

[0008] The drilling drive arrangement according to the invention is characterized in that a control unit for controlling the at least one electric motor is designed with a drilling operating mode for drilling the drilling tool into the ground while removing soil material and a release operating mode for releasing soil material from the drilling tool, wherein in the release operating mode current and / or voltage for the electrical power supply of the at least one electric motor is automatically controlled in such a way that the drilling tool repeatedly performs a rotation-stop movement with or without reversing the direction of rotation.

[0009] A fundamental aspect of the invention is the operation of a drilling drive assembly in various operating modes using an electric motor. This is achieved by providing a control unit for selectively controlling the electric motor, enabling the drilling drive assembly to be driven into different operating states. Depending on the application, the electric motor can be selectively operated by the control unit in either a drilling mode or a loosening mode, with the drilling and loosening modes differing particularly in terms of speed and torque. This allows for particularly flexible and economical use of the drilling drive assembly. A machine operator can operate the drilling drive assembly safely and efficiently by simply selecting the desired mode.

[0010] Another aspect of the invention is to enable the removal of soil material adhering to the drill drive assembly by means of a special control of the electric motor. For this purpose, the current and / or voltage of the electric motor are varied so that the direction of rotation or the speed changes within a short time interval. This means that the current and / or voltage are automatically controlled so that the electric motor performs a rotation-stop movement, shaking off soil material through the brief change in speed and torque. This allows soil material adhering to the drill drive assembly to be removed quickly and easily after drilling, resulting in more economical drilling operations overall. The automated control can be implemented in such a way as to exert high removal forces, which are hardly possible with manual control of the electric motor.

[0011] A preferred embodiment of the invention comprises more than two electric motors. It is particularly preferred that at least two electric motors are arranged on the drill drive carriage, which together drive a drive shaft, in particular a hollow drive shaft, via a summing gearbox to rotate the drill bit. This allows the drive force to be transmitted particularly efficiently from the drill drive arrangement according to the invention to the drill bit. It is advantageous if the at least two electric motors transmit the drive force to a hollow shaft via a summing gearbox with a planetary gearbox and optionally further gear stages. This enables a particularly compact design of the drill drive arrangement.

[0012] The at least two electric motors can, in principle, be operated synchronously or asynchronously. However, it is particularly advantageous if both electric motors are operated synchronously.

[0013] For bidirectional power supply to the electric motor, an inverter unit can be provided to convert current and / or voltage. It is advantageous if the at least two electric motors are rotationally fixed to each other via at least one gearbox.

[0014] A further advantageous embodiment of the invention consists in the fact that the at least two electric motors are torque-controlled by the control unit in the release mode. This allows higher speed change rates, in particular higher than 6,000 rpm / s, to be achieved. Such high speed change rates are particularly suitable for operating the drilling drive arrangement in the release mode. It is preferred if the torque control of the at least two electric motors in the release mode is designed such that the drilling drive arrangement can be controlled synchronously by the at least two electric motors. It is preferred if a target torque is provided for the torque control, which corresponds to half the sum of the torque of the first and second electric motors. This allows the drilling drive arrangement according to the invention to be operated particularly efficiently.

[0015] A further advantageous embodiment of the drilling drive arrangement according to the invention consists in the fact that the at least two electric motors are speed-controlled by the control unit in drilling mode and, in particular, can be controlled in a master-slave operation. It is advantageous if the at least two electric motors can be synchronized with each other in such a way that they drive the drilling drive arrangement with the same torque. Alternatively or additionally, it is advantageous if, in a master-slave operation, a first electric motor, in particular with an additional control unit, is speed-controlled and a second electric motor is torque-controlled. This allows for the flexible implementation of various drive modes for the drilling drive arrangement.

[0016] In certain cases, such as when higher torques are required or installation space is limited to smaller motors, three, four or more electric motors can be arranged.

[0017] A further development of the invention consists in the fact that, in the loosening mode for the rotary-stop movement, a rotation angle, a reversal of the direction of rotation, a number of rotary-stop steps, and / or a cycle time can be predefined. This allows these parameters to be individually adjusted depending on the specific conditions, such as the soil type, thus achieving particularly efficient soil loosening from the drilling tool in loosening mode. In particular, this allows the loosening time, or the time required for a largely complete loosening of the soil material, to be kept short, which significantly increases the efficiency of the drilling process. Likewise, the change over time or the time profile of rotational speed and / or torque can also be predefined as a target value in loosening mode.It is advantageous if the aforementioned predefined operating parameters for the loosening process can be stored in the control unit and adjusted as needed, depending on factors such as soil conditions. A suitable input device, such as a keyboard or touchscreen, can be provided for an operator. If individual parameters are entered or changed, the control unit can automatically adjust the other parameters in the selected operating mode to ensure efficient operation of the at least one electric motor.

[0018] A particularly advantageous embodiment of the invention is that, in drilling mode, a rotational speed can be preset by a machine operator and / or the control unit. This allows the drilling operation to be flexibly and individually adapted to conditions such as soil composition and / or drilling depth. The control of the drilling drive assembly is also simplified. It is advantageous if an input device, in particular a mobile computing unit, is provided for the machine operator to input the rotational speed. In principle, the mobile computing unit can be used to forward control commands to the control unit. It is advantageous if the control unit is designed as a computing unit for processing input data, in particular target values ​​in drilling and / or extraction mode.

[0019] In general, the at least one electric motor can be of any design. However, a particularly preferred embodiment of the invention consists in the at least one electric motor being controllable by the control unit to operate the electric motor in a recuperation mode for the recovery of electrical energy. In other words, the electric motor can be switched by the control unit from a drive mode to a recuperation mode and from a recuperation mode to a drive mode. It is advantageous if the control unit is configured to operate the electric motor in a recuperation mode depending on the speed and / or torque of the rotary drive. This allows the drilling drive arrangement to be flexibly adapted to changing operating conditions of the drilling rig.

[0020] By operating the at least one electric motor in a recuperation mode, energy generated during the operation of the drilling drive arrangement can be advantageously recovered, in particular braking energy which is generated during a rotation-stop movement with or without reversal of the direction of rotation of the drilling tool and in which the at least one electric motor in recuperation mode is converted into usable or storable electrical energy.

[0021] It is particularly preferred that an intermediate circuit for the demand-based distribution of electrical energy is connected to the drilling drive assembly, wherein at least one excess energy consumption unit, in particular a brake chopper, is provided from the intermediate circuit to absorb power peaks of the drilling drive assembly during drilling and / or extraction operation. The intermediate circuit can be designed, in particular, for conducting and distributing direct current. It is especially advantageous if the intermediate circuit is equipped with a supply device for connecting the intermediate circuit to a local power distribution network. The supply device can additionally include a converter for converting current and / or voltage.It is advantageous if the at least one electric motor includes an inverter unit for supplying and / or discharging electrical energy from the DC link, wherein the inverter unit is designed for bidirectional conversion of direct current to alternating current. This allows the at least one electric motor to be connected to the DC link particularly efficiently. The DC link is designed to dissipate excess electrical energy from the at least one electric motor to the at least one excess energy consumption unit, thus preventing excessive stress on electrical components in the event of overvoltages.

[0022] A particularly reliable embodiment of the invention is achieved by assigning a control system to the at least one excess energy consumption unit for the demand-based supply and discharge of electrical energy. It is advantageous if the supply and discharge of electrical energy depends on the state values, in particular the voltage, of the intermediate circuit. This allows overvoltage to be detected and avoided at an early stage. Furthermore, a short-term overvoltage occurring in the intermediate circuit can be compensated for very quickly by the control system. The control system can be configured with the control unit for driving the at least one electric motor, or alternatively with an additional control unit. The control of the at least one electric motor and the excess energy consumption unit can, in principle, be implemented centrally or decentrally with multiple control units.

[0023] According to a further development of the invention, it is particularly advantageous that at least one internal rechargeable battery unit is provided for receiving and storing electrical energy and for supplying the at least one electric motor with electrical energy, depending on the state of charge of the battery unit. It is advantageous if the battery unit is connected to the DC link, and the battery unit can be configured with or without a converter unit for supplying and / or discharging electrical energy to the DC link. Preferably, the voltage level of the DC link corresponds to the voltage level of the battery unit, depending on the state of charge. It is also preferred that the battery unit is designed as a surplus energy storage unit to compensate for power peaks. This allows the electric motor to be supplied with electrical energy flexibly and as needed.By directly connecting the battery unit to the intermediate circuit, additional converter units can be saved, thus reducing costs.

[0024] The drilling drive arrangement according to the invention can be used in a variety of ways. The invention particularly comprises a drilling rig for civil engineering, with a carrier unit, which is preferably mobile with a chassis, and a mast which is arranged on the carrier unit, wherein a drilling drive arrangement according to the invention is arranged on a drilling drive carriage, which is in particular mounted to be slidable along the mast.

[0025] The drilling tool of the drilling rig can preferably be designed as a discontinuous drilling tool, such as a screw drill or a box drill, which is to be pulled out of the ground and emptied at certain intervals.

[0026] The method according to the invention is characterized in that a control unit for controlling the at least one electric motor is designed with a drilling operating mode for drilling the drilling tool into the ground and with a loosening operating mode for loosening soil material from the drilling tool, wherein in the loosening operating mode the control units automatically control or change the current and / or voltage for the electrical power supply of the at least one electric motor in such a way that the drilling tool repeatedly performs a rotation-stop movement with or without reversing the direction of rotation.

[0027] The method can be carried out in particular with the drilling drive arrangement according to the invention described above. The advantages described above can be achieved in this way.

[0028] A preferred embodiment of the invention comprises at least one excess energy consumption device, wherein the power output from the drilling drive assembly during drilling and / or loosening operations is adjusted to the excess energy consumption device depending on a detected limit value. The limit value can include electrical state data, in particular current and / or voltage values ​​of the DC link and / or the at least one electric motor. When the detected limit value is exceeded, excess or generated electrical energy can be discharged to the excess energy consumption device, whereby the discharge of electrical energy can be controlled by the control unit or separately. The limit value can be measured by a measuring device for acquiring electrical state data. This prevents overvoltages from braking processes and associated damage.

[0029] Another preferred embodiment of the method according to the invention consists in adapting a control algorithm to previous and / or current overload state data of the drilling drive arrangement in order to comply with at least one limit value, preferably by means of machine learning, wherein the power dissipation of the drilling drive arrangement is controlled by the control algorithm.

[0030] The control algorithm can be implemented in the control unit for controlling the at least one electric motor or separately. The overload status data of the drilling drive assembly can preferably include current or voltage and be measured with a measuring device. This makes it possible to dynamically adjust the power output within a short time so that power peaks and overloads of the electrical components are avoided by anticipating the recovered power. Wear on affected components is also reduced. In particular, braking energy generated during a rotation-stop movement with or without reversing the direction of rotation of the drilling tool can be converted into usable or storable electrical energy in the at least one electric motor in recuperation mode. This power recovery enables energy-efficient operation.

[0031] A particularly advantageous further development of the method according to the invention consists in adjusting the power recovery of at least one further power recovery unit depending on the power recovery of the at least one electric motor. This means that if a limit value for the power recovery of the at least one electric motor is exceeded, the power recovery from other regenerative machine functions, in particular the main winch, is blocked or limited. This prevents, in particular, overloading of the excess energy consumption device and the DC link due to overvoltages. It is advantageous if the total power recovery of the various power recovery units is recorded in real time and the power recovery of certain power recovery units is reduced if a limit value is exceeded.This means that, depending on the total power recovery of a first and a second electric motor, the power recovery of the first and / or the second electric motor is adjusted to a target value.

[0032] The invention is further explained below with reference to preferred embodiments, which are shown schematically in the drawings. The drawings show: Fig. 1: a side view of the drilling drive arrangement according to the invention; Fig. 2: a schematic representation of a circuit arrangement according to the invention with an intermediate circuit and possible components; Fig. 3: a schematic representation of a circuit arrangement according to the invention with additional battery converter units; Fig. 4: a schematic side view of the drilling drive carriage according to the invention with two electric motors; and Fig. 5: a schematic rear view of the drilling drive carriage according to the invention with two electric motors.

[0033] A drilling drive arrangement 80 according to the invention with a carrier device 12 is in Fig. 1 The carrier device 12 can preferably comprise a crawler chassis as an undercarriage 14, on which a superstructure 16 can be rotatably mounted. A control unit 60 for the drilling drive assembly 80 can be located in an operator's cabin of the superstructure 16. A mast 20 can be preferably adjustably mounted on the superstructure 16 via a linkage mechanism 18, and can be in a substantially vertical position during operation.

[0034] According to the illustrated embodiment, the mast 20 can preferably be designed as a mast 21 with a linear guide 24 on its front side. A drilling drive carriage 38 with a rotary drive 36 can be mounted vertically along the linear guide 24 for vertical movement. This allows the drilling rig 10 to be designed as a deep-construction machine. The drawing shows an upper position of the rotary drive 36 and a lower position with a dashed line.

[0035] A rope 40 can be guided over a mast head 22 at the upper end of the mast 20. At one end of the rope, a preferably telescopic Kelly bar 32 with an exemplary drilling tool 34 for forming a deep-drilling tool 30 can be provided. The Kelly bar 32 can be guided by a sleeve-shaped drive wheel of the rotary drive 36 on the drill drive carriage 38, so that a torque can be transmitted from the rotary drive 36 to the Kelly bar 32, for example, via drive strips (not shown). The drilling tool 34 for creating a borehole in the ground can be arranged at the lower end of the Kelly bar 32. The drilling tool 34 can be of any design and, in particular, may include a drill auger or a drill bucket.

[0036] From the Kelly bar 32, the cable 40 can be guided via pulleys 26 at the mast head 22 along the mast 20 to a winch 46 in the superstructure 16. The winch 46 is driven by a motor 50, which can also be operated in a recuperation mode. The Kelly bar 32 with the drilling tool 34 can be raised and lowered by the cable 40 via the winch 46. During lowering, potential energy can be converted into electrical energy by the motor 50 and supplied to an intermediate circuit 98, which is described in more detail below.

[0037] An actuator 28 with a winch on the mast 20 allows the drilling carriage 38 with the rotary drive 36 to be raised via a further actuating cable 29. By driving the actuator 28 in the opposite direction, the drilling carriage 38 with the rotary drive 36 can also be lowered. The rotary drive 36 can be formed by at least one electric motor 84, which, in particular, converts braking energy generated during a rotation-stop movement with or without reversing the direction of rotation of the drilling tool 34 into usable or storable electrical energy in a recuperation mode. The actuator 28 can also be equipped with an electric motor (not shown), which, like the electric motor 84, can be operated in a recuperation mode. The drilling carriage 38 with the rotary drive 36 can also be considered part of the deep-drilling tool 30.

[0038] In the illustrated embodiment, a force measuring device 62 is preferably arranged on a deflection pulley 26 at the mast head 22. The force measuring device 62 can, for example, be designed as a force measuring bolt by which a tensile force on the rope 40 can be detected. The force measuring device 62 is connected to the control unit 60 on the superstructure 16.

[0039] The control unit 60 controls at least one motor 50 for operating the winch 46 and preferably also the electric motor 84 for operating the rotary drive 36. The control unit 60 can, in particular, be designed as a control unit 88.

[0040] In Fig. 2 A schematic circuit arrangement for operating the drilling drive arrangement 80 according to the invention is shown. The circuit arrangement is designed to supply and discharge electrical energy to a first electric motor 84 and a second electric motor 86. The first electric motor 84 can preferably be configured to supply and discharge mechanical energy to a mechanical load unit 125, for example, during a braking or lowering process. Likewise, the second electric motor 86 can preferably be configured to supply and discharge mechanical energy to a mechanical load unit 130. The first electric motor 84 and the second electric motor 86 can each be operated selectively or phase-wise in a recuperation or drive mode. For the demand-based supply or discharge of electrical energy from a DC link 98, for example, as shown in Fig. 2 As shown, a first inverter unit 91 is assigned to the first electric motor 84 and / or a second inverter unit 93 to the second electric motor 86. For direct motor control, a first motor control unit 90 can be assigned to the first electric motor 84 and a second motor control unit 92 to the second electric motor 86. The motor control can, in particular, be carried out with a control unit 88 as a higher-level control unit and the first and second motor control units 90, 92 in a master-slave configuration. In general, the control unit 88 can also be configured to directly control the first electric motor 84 and / or the second electric motor 86 of the drilling drive arrangement 80 according to the invention.

[0041] As in Fig. 2 As further shown, additional consumption units 120, such as peripheral devices, can preferably be connected to the intermediate circuit 98 for the demand-based distribution of electrical energy. The intermediate circuit 98 can preferably be designed to carry a DC voltage at a voltage level of approximately 400 V to 800 V. In particular, the intermediate circuit can be designed to carry a voltage level of 750 V.

[0042] Furthermore, the in Fig. 2 The intermediate circuit 98, shown schematically, is configured with a supply device 104 for the demand-based supply and discharge of electrical energy from an external energy source 106. The external energy source 106 can be configured, in particular, as a local power distribution network, especially an AC power network. Preferably, the supply device can include a feed-in device, such as a plug connection. Likewise, an inverter unit for converting AC voltage from a local power distribution network into DC voltage can be provided with the supply device 104. A control unit can be assigned to the supply device 104 to control the supply and discharge of electrical energy to and from the intermediate circuit 98.

[0043] In general, the control of the voltage level and, in particular, the energy distribution in the intermediate circuit 98 can be carried out centrally, for example by the control unit 88. Likewise, the control of the voltage level and energy distribution in the intermediate circuit 98 can also be implemented decentrally, for example by individual control units of the components electrically connected to the intermediate circuit. As in Fig. 2 As schematically indicated, the individual control units of the electrical components connected to the intermediate circuit 98 and the control unit 88 can be connected via a communication network 134. The control units in this sense also include, in particular, the first engine control unit 90 and the second engine control unit 92. These control units can be, as shown in Fig. 2 shown, also a first battery control unit 94 and a second battery control unit 96 are counted, which may be intended to control a first battery unit 110 and a second battery unit 112.

[0044] The components electrically connected to the intermediate circuit 98 can, in particular, include an excess energy consumption unit 100 for buffering and smoothing power peaks. The excess energy consumption unit 100 can preferably also have its own control unit, which is connected to the communication network 134. Excess electrical energy generated by the electric motors can thus be supplied from the intermediate circuit 98 to the excess energy consumption unit 100 and / or the battery units 110, 112.

[0045] As from Fig. 3 As can be seen, a first converter unit 114 can be assigned to the first battery unit 110 and a second converter unit 116 to the second battery unit 112. Thus, the voltage level in the intermediate circuit 98 can be determined independently of the voltage level, in particular the state of charge of the first battery unit 110 and / or the voltage level, in particular the state of charge of the second battery unit 112. This means that the components electrically connected to the intermediate circuit 98 can be operated independently of the voltage level of the first battery unit 110 and / or the voltage level of the second battery unit 112.

[0046] Fig. 4 shows a side view and Fig. 5A rear view of the electric rotary drive 36 with a first electric motor 84 and a second electric motor 86 on the drill drive carriage 38. The rotary drive 36 can preferably be bolted to the drill drive carriage 38, which is movable on the mast. The first electric motor 84 and the second electric motor 86 can preferably drive a hollow shaft via a common summing gearbox, the hollow shaft transmitting the drive torque to a drill bit (not shown here).

Claims

1. Drilling drive arrangement (80) for civil engineering, comprising a drilling drive carriage (38) which is slidably mounted along a mast (20) of a drilling rig (10) for civil engineering, wherein at least one rotary drive (36) is arranged on the drilling drive carriage (38) for rotating a drilling tool (34) for drilling into a soil, which is designed as an electric motor (84), characterized by that a control unit (88) for controlling the at least one electric motor (84) is designed with - a drilling operating mode for drilling the drilling tool (34) into the ground while removing soil material and - a loosening operating mode for loosening soil material from the drilling tool (34), wherein in the loosening operating mode current and / or voltage for the electrical power supply of the at least one electric motor (84) are automatically controlled such that the drilling tool (34) repeatedly performs a rotation-stop movement with or without reversing the direction of rotation.

2. Drilling drive arrangement (80) according to claim 1, characterized by that at least two electric motors (84, 86) are arranged on the drill drive carriage (38), which together drive a drive shaft, in particular a hollow drive shaft, to drive the drill tool by means of a summing gear.

3. Drilling drive arrangement (80) according to claim 2, characterized by that the at least two electric motors (84,86) are torque-controlled by the control unit (88) in the release operating mode.

4. Drill drive arrangement (80) according to claim 2 or 3, characterized by that the at least two electric motors (84, 86) are speed-controlled by the control unit (88) in the drilling operation mode, in particular in a master-slave operation.

5. Drilling drive arrangement (80) according to one of claims 1 to 4, characterized by thatIn the release mode for the rotary-stop movement, a rotation angle, a reversal of the direction of rotation, a number of rotary-stop steps and / or a cycle time can be specified.

6. Drill drive arrangement (80) according to one of claims 1 to 5, characterized by that In drilling mode, a rotational speed can be set by a machine operator and / or by the control unit (88).

7. Drilling drive arrangement (80) according to one of claims 1 to 6, characterized by that the at least one electric motor (84) can be controlled by the control unit (88) to operate the electric motor (84) in a recuperation mode to recover electrical energy in a recuperation mode.

8. Drilling drive arrangement (80) according to one of claims 1 to 7, characterized by thatAn intermediate circuit (98) for the demand-based distribution of electrical energy is connected to the drilling drive arrangement (80) by means of a conductor, wherein at least one excess energy consumption unit (100), in particular a brake chopper (102), is provided for absorbing power peaks of the drilling drive arrangement (80) in drilling and / or loosening operation from the intermediate circuit (98).

9. Drilling drive arrangement (80) according to claim 8, characterized by that which is assigned to at least one excess energy consumption unit (100) a control system for the demand-based supply and discharge of electrical energy.

10. Drilling drive arrangement (80) according to one of claims 1 to 9, characterized by that at least one internal rechargeable battery unit (110) is provided for receiving and storing electrical energy and for supplying the at least one electric motor (84) with electrical energy depending on the state of charge of the battery unit (110).

11. Drilling rig (10) for civil engineering, comprising a carrier unit (12), which is preferably mobile with a chassis, and a mast (20) which is arranged on the carrier unit (12), characterized by that a drilling drive arrangement (80) according to one of claims 1 to 10 is arranged on a drilling drive carriage (38), which is in particular slidably mounted along the mast (20).

12. Method for operating a drilling drive arrangement (80) for civil engineering, in particular according to one of claims 1 to 11, with a drilling drive carriage (38) which is slidably mounted along a mast (20) of a drilling rig (10) for civil engineering, wherein at least one rotary drive (36) is arranged on the drilling drive carriage (38) for rotating a drilling tool (34) for drilling soil, which is designed as an electric motor (84), characterized by thatA control unit (88) for controlling the at least one electric motor (84) is designed with a drilling operating mode for drilling the drilling tool (34) into the ground and with a loosening operating mode for loosening soil material from the drilling tool (34), wherein the control unit (88) automatically controls or changes current and / or voltage for the electrical power supply of the at least one electric motor (84) in the loosening operating mode such that the drilling tool (34) repeatedly performs a rotation-stop movement with or without reversing the direction of rotation.

13. Method according to claim 12, characterized by that at least one excess energy consumption device (100) is provided, wherein the power output from the drilling drive arrangement (80) in a drilling operation and / or loosening operation is adjusted to the excess energy consumption device (100) depending on a detected limit value.

14. Method according to claim 12 or 13, characterized by that a control algorithm is adapted to previous and / or current overload state data of the drilling drive arrangement (80) to comply with at least one limit value, preferably by means of machine learning, wherein the power dissipation of the drilling drive arrangement (80) is controlled by the control algorithm.

15. Method according to any one of claims 12 to 14, characterized by that depending on the power recovery of the at least one electric motor (84), the power recovery of at least one further power recovery unit is adjusted.

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