Ground drilling device, method for making a ground drilling device, method for maintaining a ground drilling device, and use of a ground drilling device

Abstract

A ground drilling device comprising a housing, a lengthwise movable drilling head tip arranged in the housing, and a bearing for supporting the drilling head tip in the housing during its lengthwise movement.

Claims

1. Ground drilling device, comprising a housing, a lengthwise movable drilling head tip arranged in the housing, and a bearing for supporting the drilling head tip in the housing during its lengthwise movement.

2. Device according to claim 1, characterized by a receiving space in the housing, wherein the receiving space encompasses the bearing for the drilling head tip and is accessible at the drilling head end.

3. Device according to claim 1, wherein the device is a percussion drilling device.

4. Device according to claim 1, wherein the bearing encloses the drilling head tip at least for a portion on its circumference.

5. Device according to claim 1, wherein the bearing comprises multiple segments.

6. Device according to claim 1, wherein the bearing comprises a material which is different from the drilling head tip.

7. Device according to claim 2, wherein the receiving space has an extension in the lengthwise direction of the housing in the range of 10 mm to 100 mm.

8. Device according to claim 7, wherein the extension of the receiving space in the lengthwise direction of the housing in relation to the extension of the bearing in the lengthwise direction is a ratio in the range of 1.05 to 1.5.

9. Device according to claim 1, wherein an internal diameter of the housing outside the bearing is oversized in relation to the external diameter of the drilling head tip.

10. Device according to claim 1, wherein the bearing is held in the housing by means of a press-fit or a glued press-fit.

11. Method for making a ground drilling device, comprising the steps of: providing a housing, providing a lengthwise movable drilling head tip in the housing and arranging the drilling head tip in the housing, and introducing a bearing for the drilling head tip between the housing and the drilling head for the lengthwise movement.

12. Method for maintaining a ground drilling device, comprising the steps of: providing a housing with a lengthwise movable drilling head tip in the housing, grasping a bearing which is present in the housing for supporting the lengthwise movement of the drilling head tip, and pulling the bearing out.

13. Use of a ground drilling device, which comprises a housing and a lengthwise movable drilling head tip arranged on the housing, characterized in that a bearing for the drilling head tip is used.

Description

[0033] The invention shall now be explained more closely with the aid of an exemplary embodiment presented in the drawing.

[0034] The drawing shows:

[0035] FIG. 1 a region of a ground drilling device at the drilling head end.

[0036] FIG. 1 shows a section of a ground drilling device at the drilling head end. A drilling head tip 1 is present, which is arranged in a housing 2. For the supporting of the drilling head tip 1, a receiving space 3 is formed in the housing 2 at the end side. The receiving space 3 is accessible from the drilling head end, i.e., from the front. In the receiving space 3 there is arranged a bearing 4. The receiving space 3 with the bearing 4 is covered at the front end by means of an adapter 5 secured to the drilling head tip 1. Moreover, another lengthwise axially movable adapter 6 is provided, which is likewise connected to the drilling head tip 1. If the adapters 5 and 6 are removed, access can be gained to the bearing 4 in the receiving space 3 without having to dismantle the drilling head tip 1. An annular seal 25, arranged in a corresponding groove, is provided for the sealing between adapter 5 and housing 2.

[0037] The housing 2 is connected to a housing 7 in which a main piston 10 is arranged. The drilling head tip 1 has an exposed end, which comes into contact with the soil. At the end opposite the end of the drilling head tip 1 exposed to the soil there is formed an anvil 8, which can be struck by the main piston 10.

[0038] An annular spring 9 is provided for pretensioning the drilling head tip 1 relative to the housing 2, being arranged between the drilling head tip 1 and the housing 2.