Ground drilling device for cable-guided drilling, method for cable-guided ground drilling , and use during cable-guided drilling

Abstract

A ground drilling device for cable-guided drilling comprising a drive for connecting and/or moving rod sections of a drill string along a drill string axis, wherein a cable reserve for receiving a cable with a length of at least two rod sections is provided and a contact device for electrical contacting of one end of the cable of the cable reserve is provided.

Claims

1. A cable feed system for cable-guided drilling with a horizontal ground drilling device, the cable feed system comprising: a drive for connecting and/or moving rod sections of a drill string along a drill string axis, a cable reserve comprising a cable with a length of at least two rod sections, a rotary feedthrough with a first longitudinal end configured to receive a first end of the cable from the cable reserve and to feed the first end of the cable to a rod section, the rotary feedthrough comprising a jointly rotating connection at a second longitudinal end configured for connecting to a rod section of the drilling string; and an electrical contact for electrically contacting a second end of the cable of the cable reserve.

2. The cable feed system according to claim 1, wherein the cable reserve has a spool.

3. The cable feed system according to claim 2, wherein the spool is arranged about the drill string axis.

4. The cable feed system according to claim 1, further comprising at least one guide roller for feeding the cable.

5. The cable feed system according to claim 4, wherein the cable feed is configured for feeding the cable along into the drill string axis.

6. The cable feed system according to claim 4, further comprising a seal provided on the cable feed for sealing against flushing liquid supplied to the drill string.

7. The cable feed system according to claim 1, wherein the cable reserve is arranged on the first end of the rotary feedthrough such that the cable reserve is spaced apart from the connection at the second end of the rotary feed through for connecting the rotary feed through with a rod section.

8. The cable feed system according to claim 1, further comprising a motor or cylinder functionally connected to the cable reserve, and configured to hold the cable under tension.

9. The cable feed system according to claim 8, wherein when the motor or cylinder comprises the motor, the motor comprises one of an electromotor or a pneumatic motor, and wherein when the motor or cylinder comprises a cylinder, the cylinder comprises one of a hydraulic cylinder, an electro-cylinder, or a pneumatic cylinder.

10. The cable feed system according to claim 1, wherein the cable reserve is arranged on the first longitudinal end side of the rotary feedthrough.

11. The cable feed system according to claim 1, wherein a center axis of a spool of the cable reserve is aligned concentrically to a center axis of the connection, which coincides with the drill string axis.

12. The cable feed system according to claim 1, wherein the cable reserve is configured to rotate independently from the rotary feedthrough and the connection.

13. The cable feed system according to claim 1, wherein the rotary feedthrough comprises an axial opening extending between the first longitudinal end and the second longitudinal end.

14. A method for feeding a cable for cable-guided ground drilling with a horizontal ground drilling device, comprising: arranging a cable reserve comprising a cable with a length of at least two rod sections on a first end of a rotary feedthrough configured to receive a first end of the cable from the cable reserve and to feed the first end of the cable to a rod section to be attached to an existing rod section of a drill string installed in the ground, wherein the existing rod section comprises an existing cable, establishing a constant electrical contact between a second end of the cable in the cable reserve and an electrical contact connected to a computing device; connecting the first end of the cable to the existing cable in the existing rod section, and connecting, by a drive, the rod section to the existing rod section of the drill string installed in the ground and in which the existing cable is present.

15. The method of claim 14, wherein the cable reserve comprises a spool arranged about a drill string axis of the drill string.

16. The method of claim 14, further comprising feeding the cable with at least one guide roller.

17. The method of claim 14, wherein the cable reserve is configured for feeding the cable from the cable reserve along a drill string axis of the drill string.

18. The method of claim 14, further comprising arranging a seal on the cable for sealing against flushing liquid supplied to the drill string.

19. The method of claim 14, further comprising arranging the cable reserve on the first end of the rotary feedthrough such that the cable reserve is spaced apart from a connection on the second end of the rotary feed through for connecting the rotary feed through with a rod section.

20. The method of claim 14, further comprising holding the cable under tension by a motor or cylinder functionally connected to the cable reserve.

21. The method of claim 20, wherein when the motor or cylinder comprises the motor, the motor comprises one of an electromotor or a pneumatic motor, and wherein when the motor or cylinder comprises a cylinder, the cylinder comprises one of a hydraulic cylinder, an electro-cylinder, or a pneumatic cylinder.

Description

BRIEF DESCRIPTION OF DRAWINGS

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

(2) FIG. 1 shows a section in the area of a drive of a ground drilling device with a spool and a cable reserve from one side in an isometric depiction, and

(3) FIG. 2 shows the depiction from FIG. 1 from another side.

(4) FIG. 3 is a schematic depiction of a ground drilling device from the side with a drill string, rod section, drive, rotary feedthrough, and cable reserve.

DETAILED DESCRIPTION

(5) FIGS. 1 and 2 show a section in the area of a rotary feedthrough 1 for drilling fluid of a ground drilling device in an isometric depiction from two sides. Rotary feedthrough 1 has a jointly rotating connection 2, which may be brought into connection with a new rod section to be drilled. Connection 2 may be connected to a rear end of a new rod section to be drilled, and the rod section may be connected to the already drilled drill string. Connection 2 defines a drill string axis L, which is depicted by means of a dashed line in FIG. 1.

(6) A cable 3 used for cable-guided drilling is present as cable reserve 4. A contact device 5, which has an electrical contact which is electrically connected to one end of cable 3 of cable reserve 4, is provided on cable reserve 4. Contact device 5 is additionally connected to an electrical connection, which establishes a connection to a display or to a unit processing a signal applied to cable 3. Cable reserve 4 is configured as a spool 6, which may receive a cable 3 with a length of at least two rod sections. One end of cable 3 of cable reserve 4 is guided via a cable feed 7 into axis L of connection 2.

(7) Cable feed 7 has guide rollers 8, configured as deflection rollers, by means of which cable 3 may be guided to connection 2 from behind. Spool 6 is arranged for this purpose on an end side on rotary feedthrough 1 or connection 2. The center axis of spool 6 is aligned concentrically to the center axis of connection 2, which coincides with drill string axis L. Cable 3 is thus guided through connection 2 and may project out of connection 2 at the other end of the same, in order to be connected to a cable of an already drilled drill string.

(8) A seal 9 is present in the area of guide roller 8, which aligns the cable substantially in the longitudinal axial direction of connection 2, said seal being able to seal an opening 10. Pressure may be applied to a cylinder 15 connected to seal 9.

(9) Traction means 11 is provided, with which cable reserve 4 is functionally connected by means of two meshing gears 12, 13. Traction means 11 is functionally connected to the cable reserve in such a way that it may maintain cable 3 of cable reserve 4 under tension. Traction means 11 is configured as a hydraulic motor.

(10) A flushing liquid supply 14 for supplying flushing liquid, in particular bentonite, is provided on rotary feedthrough 1.

(11) FIG. 3 schematically shows a ground drilling device 20. Ground drilling device 20 has a drilling carriage 24 on which drive 22 may be moved back and forth. One end of rotary feedthrough 1 is arranged next to drive 22, and a second end of rotary feedthrough 1 is arranged next to cable reserve 4. Using drive 22, a drill string 28, which has rod sections such as rod section 26, may be moved through the ground translationally and/or rotationally in the longitudinal axial direction of the drill string.