Rod section of a ground drilling rod, drive element, rod section system, and ground drilling device

Abstract

The invention relates to a rod section of a ground drilling rod, wherein the rod section is configured at the end side to form at least one plug connection and has at one end (a) a male connector with an outer contour or (b) a female connector with an inner contour, wherein, in cross section, the outer contour or the inner contour has a shape deviating from a circle.

Claims

1. Rod section (5) of a ground drilling rod, wherein the rod section (5) is configured at the end side to form at least one plug connection (4) and has at one end (a) a male connector (12) with an outer contour (25) or (b) a female connector (14) with an inner contour (13), characterized in that, in cross section, the outer contour (25) or the inner contour (13) has a shape deviating from a circle.

2. Rod section (5) according to claim 1, characterized in that the shape deviating from a circle is an oval shape, in particular an elliptical shape.

3. Rod section (5) according to either claim 1 or claim 2, characterized in that the shape of the outer contour (25) or the inner contour (13) is asymmetrical in cross section.

4. Rod section (5) according to any of claims 1 to 3, characterized in that the male connector (12) or the female connector (14) has an opening oriented transversely to the longitudinal axis of the rod section (5) for inserting a bolt (16) which can be detachably connected to the male connector (12) or to the female connector (14), so that the oval shape is broken through.

5. Rod section (5) according to claim 4, characterized in that a line intersects the opening which encloses an angle of less than 30° with an axis of symmetry of the inner contour (13) or the outer contour (25) or with an axis running perpendicular to the axis of symmetry of the inner contour (13) or the outer contour (25).

6. Rod section (5) according to claim 5, characterized in that the line extends along a minor axis of an inner contour (13) or outer contour (25) designed as an ellipse.

7. Rod section (5) according to any of claim 4 and 5 or 6, if dependent on claim 4, characterized in that the opening (26, 27, 28, 29) is part of a through hole (17, 18) which protrudes completely through the male connector (12) or the female connector (14).

8. Rod section (5) according to any of claims 4 and 5 to 7, if dependent on claim 4, characterized in that the opening (26, 27, 28, 29) is configured to be threadless.

9. Rod section (5) according to any of claims 1 to 8, characterized in that a latching element (15) for engaging the bolt (16) is arranged in the male connector (12), the longitudinal extent of the latching element (15) enclosing an angle of 0° to 45° with the longitudinal axis of the rod section (5).

10. Rod section (5) according to any of claims 1 to 9, characterized in that at least one marking (22) is provided on the rod section (5) on an outwardly directed surface, which is in a predetermined angular relationship to the angular position of the shape of the inner contour (13) or the outer contour (25).

11. Drive element for driving a ground drilling rod into the ground, which is configured to be brought into engagement with a rod section (5), wherein the drive element engaging with the rod section (5) is configured (a) as a male connector (12) or (b) as a female connector (14), characterized in that, in cross section, the outer contour (25) or the inner contour (13) has a shape deviating from a circle.

12. Rod section system comprising two or more rod sections (5) according to any of claims 1 to 10, characterized by a bolt (16) having a circumferential groove (20) for inserting into the opening (26, 27, 28, 29).

13. Ground drilling device having a drive element according to claim 11.

Description

[0048] The invention is explained in more detail below with reference to an embodiment shown in the drawings, in which:

[0049] FIG. 1 is a side view in a partially sectioned illustration of a portion of a ground drilling device with a drill string having rod sections;

[0050] FIG. 2 is an isometric view of an enlarged view of two rod sections which can be plugged into one another with a female connector and a male connector;

[0051] FIG. 3 is an enlarged illustration of a connection of two rod sections in a sectional illustration; and

[0052] FIG. 4 is a section transverse to the line A-A from FIG. 3 in the region of the male connector, female connector, and bolt.

[0053] FIG. 1 shows, in a side view, schematically in a partially sectioned illustration, a section of a ground drilling device 2 which is inserted in a construction pit 3. By means of a drive, the ground drilling device 2 can move a ground drilling rod, which has rod sections 5 and a drill head 6, which is followed by a transmitter receptacle 7, into the ground 8 in a pushing or pulling manner.

[0054] The movement is carried out by two hydraulic cylinders 1 of the drive, to which a pawl 10 is fastened, which can engage the rod sections 5 via circumferential grooves 9 of the rod sections 5 in order to push the ground drilling rod into the ground 8. The pawl 10 is connected to cylinder tubes 11 of the hydraulic cylinders 1. The pawl 10 pushes itself out of a groove 9 during the retraction (idle stroke) of the hydraulic cylinder 1 and, when it reaches a further groove 9, falls into this groove, so that the hydraulic cylinder 1 can push the ground drilling rod having the drill head 6, the transmitter receptacle 7, and the rod sections 5 further in a next working stroke.

[0055] The ground drilling device can move the ground drilling rod in the ground by pulling or pushing, and in the embodiment shown in FIG. 1, the hydraulic cylinders 1 can be rotated together with the pawl 10 in their effective direction.

[0056] FIG. 2 shows, in an isometric illustration, two rod sections 5 connected to one another via a plug connection 4 to form part of a ground drilling rod. The rod section 5 has two grooves 9 which are at a distance from one another in the longitudinal direction and in which the pawl 10 can engage. FIG. 2 shows a male connector 12 at one end (right) and a female connector 14 at the other end (left) for the rod section 5. In the left edge region of FIG. 2, it can be seen that a further rod section 5, of which only one end is shown, is inserted with its male connector 12 into the female connector 14. The region of the plug connection 4 is provided with a circle marked X.

[0057] FIG. 3 shows a section in the region X of the plug connection 4 of FIG. 2. The male connector 12, which has an elliptical outer contour 25 in cross section and is arranged at one end of the rod section 5, is pushed into an elliptical inner contour 13 of the female connector 14 of a further rod section 5.

[0058] An opening 28 and an opening 29, which are part of a through hole 17, are provided on the male connector 12. Furthermore, an opening 26 and an opening 27, which are part of a through hole 18, are provided on the female connector 14. When forming the plug connection of the female connector 14 and the male connector 12, the through holes 17, 18 are congruent and a bolt 16 can be inserted into the openings (26, 27, 28, 29) of the through holes 17, 18.

[0059] A securing of the bolt 16 or a slipping of the bolt 16 out of the through holes 17, 18 is achieved by means of a spring-loaded latching element 15 which is configured as a pressure piece. The latching element 15 is screwed into a sleeve having an external thread in the front end of the male connector 12. The latching element 15 engages with one end 19, which is configured spherically in the illustrated embodiment, into a circumferential groove 20 of the bolt 16.

[0060] To separate the rod sections 5, which are connected by means of the plug connection 4 and the bolt 16, the bolt 16 can easily be pushed out counter to the latching action of the latching element 15, in this case in the illustrated embodiment the spring force of the latching element 15, which spring force acts on the spherical end 19 of the latching element 15.

[0061] FIG. 4 shows, in a section A-A from FIG. 3, the arrangement of the bolt 16 in the direction of the minor axis X-X of the elliptical male connector 12 of the rod section 5. As a result of this arrangement and the configuration (extension of the elliptical shape in the direction of the major and minor axes), the pressing surfaces 21, but also the cross-sectional surfaces of the male connector 12, female connector 14, and bolt 16 are almost identical.

[0062] In FIG. 2, a marking “12,” which is provided with the reference sign 22, can be seen on the outside of the female connector 14 on the end-side circumference. The marking 22 is in a predetermined angular relationship to the shape of the inner contour 13 of the female connector 14. The marking 22 is arranged on the outer circumference at the point of the female connector 14 at which the minor axis of the elliptical shape of the inner contour 13 intersects the outer circumference. The marking 22 indicates how the rod section 5 is aligned in a rotational manner with respect to its longitudinal axis.