Ground drilling device, system comprising the ground drilling device, method for producing a ground drilling device, and use of a ground drilling device

Abstract

A ground drilling device with a drivetrain for rotating a drill string, wherein at least one section of the drivetrain is configured to form a channel between a force transmission element of the drivetrain and the drill string, wherein the channel projects through the force transmission element and the force transmission element may be driven radially in the drivetrain.

Claims

1. A ground drilling device with a drivetrain for rotating a drill string, wherein at least one section of the drivetrain is configured to form a channel that extends through a force transmission element of the drivetrain to the drill string, wherein the force transmission element is radially drivable in the drivetrain by a drive of the drivetrain, the drive comprising a hollow shaft motor having a driving element that surrounds the force transmission element, the drive being without gearing that extends lateral to the drill string for moving the driving element.

2. The ground drilling device according to claim 1, further comprising an additional drivetrain, wherein a section of the additional drivetrain is configured to form an additional channel that extends through an additional force transmission element of the additional drivetrain to the drill string, and the additional force transmission element is radially drivable in the additional drivetrain by an additional drive comprising an additional hollow shaft motor.

3. The ground drilling device of claim 2, wherein the force transmission element and the additional force transmission element each comprise a hollow shaft.

4. The ground drilling device of claim 2, wherein the hollow shaft motor and the additional hollow shaft motor each comprise a hydraulic motor.

5. The ground drilling device of claim 2, wherein the drill string includes a plurality of rod sections, and further comprising an adapter through which the channel extends which is connected at one end to the force transmission element and which is configured at its other end to be connected to a last rod section.

6. The ground drilling device of claim 2, further comprising a rotary feedthrough attached to the additional force transmission element and configured for feeding flushing liquid to the drill string.

7. The ground drilling device according to claim 1, wherein the force transmission element is a hollow shaft.

8. The ground drilling device according to claim 1, wherein the hollow shaft motor is configured as a hydraulic motor.

9. The ground drilling device according to claim 1, wherein the drill string comprises a plurality of rod sections, and further comprising an adapter connected at one end to the force transmission element and configured at its other end in order to be connected to a last rod section of the drill string, wherein the adapter forms a section of the channel.

10. A system comprising: a ground drilling device having a drill string, a drivetrain for rotating the drill string, wherein at least one section of the drivetrain is configured to form a channel that extends through a force transmission element of the drivetrain to the drill string, wherein the force transmission element is radially drivable in the drivetrain by a drive of the drivetrain comprising a hollow shaft motor having a driving element that surrounds the force transmission element, the drive being without gearing that extends lateral to the drill string for moving the driving element, wherein the drill string includes at least one rod section.

11. The system according to claim 10, wherein the at least one rod section is configured as a double drill string rod section.

12. The system according to claim 10, further comprising an additional drivetrain, wherein a section of the additional drivetrain is configured to form an additional channel that extends through an additional force transmission element of the additional drivetrain to the drill string, and the additional force transmission element is radially drivable in the additional drivetrain by an additional drive comprising an additional hollow shaft motor.

13. The system of claim 12, further comprising a rotary feedthrough attached to the additional force transmission element and configured for feeding flushing liquid to the drill string.

14. A method for producing a ground drilling device with a drivetrain for rotating a drill string, comprising: forming a channel that extends through a force transmission element of the drivetrain and through a connection for the drill string to the drill string; and providing, by a hollow shaft motor drive of the drivetrain having a driving element that surrounds the force transmission element without gearing that extends lateral to the drill string for moving the driving element, a radial force application to drive the force transmission element to rotate the drill string.

15. The method of claim 14, wherein the step of forming the channel that extends through the force transmission element of the drivetrain and the connection for the drill string further comprises mounting on the force transmission element an adaptor connection through which the channel extends and which connects to an outer section of the drill string to transfer the torque and the rotational movement thereto.

16. The method of claim 14, wherein forming the channel further comprises forming a channel that extends through an additional force transmission element of an additional drivetrain; and further comprising providing an additional hollow shaft motor drive of the additional drivetrain configured to apply a radial force to drive the additional force transmission element to rotate the drill string.

17. The method of claim 16, further comprising attaching a rotary feedthrough to the additional force transmission element for feeding flushing liquid to the drill string.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is subsequently described in greater detail with reference to an embodiment depicted in the figures.

(2) As shown in:

(3) FIG. 1 is a schematic depiction of a ground drilling device from the side with a double drill string section connected to the ground drilling device;

(4) FIG. 2 is a sectional depiction of an area of a drive train of the ground drilling device shown in FIG. 1.

DETAILED DESCRIPTION

(5) FIG. 1 schematically shows a ground drilling device 1. Ground drilling device 1 has a drivable drilling carriage 2, which functions as a guide for drive 4. Using drive 4, a drill string, which has rod sections, may be moved through the ground translationally i.e., pushing or pulling by means of drive 4 on drilling carriage 2. Drive 4 is also configured for a rotational drive of the drill string.

(6) Thrust or traction forces may be applied via string adapter 6 to a double drill string, which has a rod section, as is schematically depicted in FIG. 1. The rod section, which has an inner drill string 5 and an outer drill string 3, to which torques and/or rotational speeds for inner drill string 5 and outer drill string 3 may respectively be applied, independently from one another via string adapter 6.

(7) FIG. 2 shows in more detail two drivetrains 50, 51 of ground drilling device 1, shown in FIG. 1, with the end of the double drill string section also depicted in FIG. 1. FIG. 2 further shows the housing frame 7, translationally guided on drilling carriage 2, by means of which the translational movements are possible with respect to the drilling carriage 2 in the direction of the drill string axis. Housing frame 7 is suited for supporting elements of drivetrains 50, 51. Drivetrain 50 has a drive configured as hydraulic motor 8 and a bearing housing 9. Hydraulic motor 8 is flange mounted on bearing housing 9. Hydraulic motor 8 is designed as a hollow shaft motor, which engages via a toothing 10 on a force transmission element 11 configured as a hollow shaft. Force transmission element 11 is connected to an adapter 20. Adapter 20 is mounted on force transmission element 11. Adapter 20 is connected to outer drill string 3 via string adapter 6 in order to transfer the torque and the rotational movement to outer drill string 3.

(8) A channel 22 is formed through force transmission element 11 and through adapter 20 connected to force transmission element 11, in the interior of which channel 22 a supply may be established to the drill string. The supply is used both for a drive of inner drill string 5 and also for the supply of flushing liquid, which will be subsequently described in greater detail.

(9) For the drive of inner drill string 5, a second hollow shaft motor 12 is provided as the drive, which is flange mounted on a second bearing housing 15. Second hollow shaft motor 12 engages from radially outside via a second toothing 13 on an additional force transmission element 14, which is configured as a hollow shaft. Second force transmission element 14 is connected to an adapter 16 configured as an inner adapter. Adapter 16 is for its part connected at the other end to inner drill string 5 in order to transfer torque and rotational movement to inner drill string 5 by means of second drivetrain 51, independently from the drive of outer drill string 3.

(10) Furthermore, a rotary feed through 17 is depicted in FIG. 2 which is attached in a centered way on additional force transmission element 14 on the side spaced apart from adapter 16 for feeding flushing liquid.

(11) For directional control of the drill string, an asymmetrical drill head may be used, which may be rotated into the drilling direction to be controlled via outer drill string 3. In the control position, it is necessary to secure force transmission element 11 with connected outer drill string 3 and the drilling head against rotating. This is carried out in the embodiment depicted in FIG. 2 by means of a stop brake 18, which is connected to force transmission element 11 via a feather key 19.