DEVICE FOR CLEARING A HELIX GAP OF AN AUGER, AND METHOD FOR MAKING A DRILLED HOLE

Abstract

The invention relates to a device for clearing a helix gap of an auger, comprising a retainer for holding the device on a mast of a drill, a guide tube which surrounds the auger in portions and is mounted on the retainer, and a clearing element which engages in the helix gap and is mounted on the retainer so as to be freely rotatable about the drilling axis. According to the invention it is provided for the guide tube to be mounted on the retainer so as to be freely rotatable about the drilling axis, for the clearing element to be firmly attached to the rotatably mounted guide tube, for the guide tube to be axially fixed in the direction of the drilling axis, for the purpose of clearing, and for the clearing element, together with the guide tube, to be able to be caused to rotate about the drilling axis by means of a pulling procedure of the auger for the purpose of clearing the auger. The invention further relates to a method for making a drilled hole in the ground using a drill, wherein the device according to the invention is used.

Claims

1-11. (canceled)

12. A device for clearing a helix gap of an auger, comprising a retainer for holding the device on a mast of a drill, a guide tube which surrounds the auger, with the drill flute, in portions and is mounted on the retainer, and a clearing element which engages in the helix gap and is mounted on the retainer so as to be freely rotatable about a drilling axis, wherein the guide tube is mounted on the retainer so as to be freely rotatable about the drilling axis, the clearing element is firmly attached to the rotatably mounted guide tube, for clearing, the guide tube is axially fixed in the direction of the drilling axis, and by means of a pulling procedure of the auger, the clearing element, together with the guide tube, can be caused to rotate about the drilling axis, for the purpose of clearing the auger, characterized in that the clearing element comprises a clearing plate having a receiving slit in which the drill helix engages.

13. The device according to claim 12, wherein the clearing plate surrounds an upper side and an underside of the drill helix, from the free edge of the drill helix, by means of the receiving slit.

14. The device according to claim 13, wherein the clearing plate comprises a plate main body, on which at least one adjusting plate is adjustably mounted, in order to form the receiving slit.

15. The device according to claim 12, wherein at least one guide roller for resting on a drill helix of the auger is rotatably mounted on the clearing element.

16. The device according to claim 12, wherein the retainer comprises an annular receptacle on which the guide tube is rotatably mounted and received.

17. The device according to claim 16, wherein a plurality of bearing rollers is arranged on the annular receptacle, by means of which rollers the guide tube is mounted on the retainer so as to be rotatable about the drilling axis and axially fixed with respect to the drilling axis.

18. The device according to claim 16, wherein the annular receptacle is formed having two pivot arms, which are mounted so as to be pivotable between a closed operating position, in which the pivot arms are pivoted together in order to form the annular receptacle and are interconnected by means of a detachable connection means, and an open position, in which the pivot arms are pivoted apart from one another laterally.

19. The device according to claim 12, wherein the guide tube is separable for the purpose of opening.

20. The device according to claim 12, wherein the retainer comprises a carriage guide for displaceable guidance along the mast of the drill, and a fixing means for fixing the retainer on the mast.

21. A drill comprising an undercarriage, an upper structure mounted thereon, and a mast, along which a drilling drive comprising a driven auger is displaceably mounted, wherein a device according to claim 12 is arranged.

22. A method for making a drilled hole in the ground using a drill according to claim 21, wherein an auger for forming the drilled hole is screwed into the ground and subsequently drawn again, wherein during pulling of the auger, remaining ground material is cleared from a helix gap of the auger by means of a device.

Description

[0031] The invention is described in more detail in the following, with reference to a preferred exemplary embodiment which is shown schematically in the accompanying drawings. In the drawings show:

[0032] FIG. 1 a perspective view of a device according to the invention;

[0033] FIG. 2 a front view of the device of FIG. 1;

[0034] FIG. 3 a plan view, from above, of the device of FIGS. 1 and 2; and

[0035] FIG. 4 a partial perspective view of the device according to FIGS. 1 to 3, with guide tube being removed.

[0036] As can be seen in FIGS. 1 to 3, a device 10 according to the invention for clearing a helix gap of an auger (not shown) comprises a retainer 12 having a carriage-like main body 14. In order to form a carriage guide 16, slide blocks are arranged on a rear face of the main body 14, by means of which blocks the retainer 12 can be displaceably guided and fixed along a linear guide on a mast, in particular a leader, of a drill. The carriage guide 16 can correspond to the guidance on a drilling drive on the mast of the drill.

[0037] On the front face thereof, the retainer 12 comprises an annular receptacle 50 which is typically arranged horizontally during operation, and which is formed by two pivot arms 52. The pivot arms 52 are in each case mounted, by means of a swivel joint 56, on the main body 14 and the retainer 12 so as to be pivotable between a closed operating position, which is shown in the drawings, and an open position in which the pivot arms 52 are in each case pivoted laterally outwards about the swivel joint 56. In the operating position, the pivot arms 52 are detachably connected via a connection means 54. In the exemplary embodiment shown, the connection means 54 comprises a vertically oriented locking bolt.

[0038] In the closed operating position of the annular receptacle 50, a guide tube 20 is received therein and is mounted so as to be rotatable about a vertically oriented drilling shaft 5. An inside diameter of the guide tube 20 is matched to an outside diameter of the auger (not shown), such that the auger is received in the guide tube 20 in a guiding and rotatable manner. The guide tube 20 can itself be separable into two parts, which is indicated schematically by an axially extending interstice 24 on the guide tube 20.

[0039] When the annular receptacle 50 is opened, the guide tube 20 can also be held and removed using a lifting equipment comprising hooks, wherein retaining lugs 26 for corresponding hooks of the lifting equipment are arranged on the upper side of the guide tube 20.

[0040] The guide tube 20 protrudes through the annular receptacle 50, wherein a clearing element 30 is fastened on a lower end of the guide tube 20 in a detachable and adjustable manner, by means of a clearing retainer 37. A plate main body 34 comprising a receiving slit 38 is provided on the clearing retainer 37. The receiving slit 38 is designed for laterally receiving a drill helix of the auger. For the purpose of matching to the geometry of the auger, a clearing plate 32 comprising upper and lower adjusting plates 36 is provided on the plate main body 34. For the purpose of adjusting the geometry and the width of the receiving slit, the upper and lower adjusting plates 36 are adjustably fastened by means of screw connections and corresponding slotted holes in the adjusting plates 36. The clearing retainer 37 can comprise a swivel joint, about which the clearing element 30 can be pivoted out of a clearing position in the auger and into a release position.

[0041] Furthermore, the clearing element 30 comprises a radially oriented guide roller 40, which is arranged and formed such that it comes to rest on an underside or upper side of the drill helix. In this case, the guide roller 40 can roll on the drill helix, such that, in the case of an axial pulling movement of the auger vertically upwards, on account of the pitch of the drill helix a force is exerted, in the peripheral direction, on the clearing element 30 and thus on the rigidly connected guide tube 20.

[0042] In this case, according to the invention the guide tube 20 is mounted so as to be rotatable about the typically vertically oriented drilling axis 5. For this purpose, the guide tube 20 comprises two annular webs 22 on the outer side thereof, wherein in FIGS. 1 and 3 only the upper annular web 22 is visible in each case. By means of the upper annular web 22, the guide tube 22 rests on radially oriented bearing rollers 60, on an inner face of the annular receptacle 50, wherein the bearing rollers 60 are shown in FIG. 4. In the exemplary embodiment shown, in each case two bearing rollers 60 are arranged on one of the two pivot arms 52, respectively, having a radially oriented rolling axis. On the guide tube 20, the lower annular web is thus spaced apart, axially downwards, from the upper annular web 22 by an amount which approximately corresponds to the diameter of the bearing rollers 60, such that the guide tube 20 is received in the annular receptacle 50 so as to be rotatable, but axially fixed.

[0043] On account of the described geometry, in the case of axial pulling of the auger having a certain screw pitch, a force can be exerted on the clearing element 30 by the guide roller 40, such that the guide tube 20, having the attached clearing element 30 and mounted so as to be freely rotatable, is set into a revolving movement about the drilling axis 5. In this case, the clearing plate 32, which engages in a drill helix gap of the auger, smears said region and can thus strip off ground material remaining on the auger helix.

[0044] In order to facilitate the ejection of the ground material via the clearing plate 32, which is matched to the helix gap with respect to the radial and axial dimensions, a recess 28 for ejecting the ground material is provided in a lower region of the guide tube 20.