DEVICE FOR CLEANING AN INTERMEDIATE SPACE IN THE SPIRAL OF A DRILL BIT, DRILLING APPARATUS AND METHOD FOR PRODUCING A DRILLING MACHINE

Abstract

DEVICE FOR CLEANING A SPIRAL INTERMEDIATE SPACE OF A DRILL BIT AND METHOD FOR PRODUCING A DRILLING MACHINE. The present invention relates to a device for cleaning a spiral intermediate space of a drill bit, with a retainer for retaining the device on a mast of a drilling machine, a guide tube which encompasses the drill bit in some sections and is mounted on the retainer, and a cleaning element that engages in the spiral intermediate space and is mounted on the retainer in a freely rotatable manner around the geometric axis of drilling.According to the present invention, the guide tube is mounted on the retainer in a freely rotatable manner around the geometric axis of drilling; the cleaning element is fixed to the rotatably mounted guide tube; for cleaning, the guide tube is axially fixed in the direction of the geometric axis of drilling; and, through a drill bit extraction method, the cleaning element with the guide tube can be offset by one rotation around the geometric axis of drilling. Furthermore, the present invention relates to a method for forming a borehole in the ground with a drilling apparatus, wherein the device according to the present invention is used.

Description

1 / 13 DEVICE FOR CLEANING AN INTERMEDIATE SPACE IN THE SPIRAL OF A DRILL BIT, DRILLING APPARATUS AND METHOD FOR PRODUCING A DRILLING MACHINE

[001] The present invention relates to a device for cleaning a spiral intermediate space of a drill bit, with a retainer for retaining the device on the mast of a drilling machine, a guide tube which terminally surrounds the drill bit and is mounted on the retainer, and a cleaning element which engages in a spiral space and is rotatably mounted around a drill shaft in the retainer, according to the preamble of claim 1.

[002] The present invention also relates to the formation of a hole in the ground with a drilling apparatus, wherein a drill bit for forming the hole in the ground is inserted by rotation and then removed again, in accordance with the preamble of claim 11.

[003] When drilling a hole in the ground, especially with cohesive soil material, it is often necessary to remove soil material that remains in the drill spiral after the drill bit is withdrawn. For such cleaning of the drill spiral spaces and cleaning the drill bit of remaining soil material, a cleaning device is known to be provided in a drilling rig.

[004] In a simple construction, the cleaning device features a stationary guide tube in which, for cleaning a spiral space, a cleaning plate can be oscillated. Through an adjusted rotational and extraction movement of the drill, soil material remaining in the spiral spaces can be removed through the cleaning plate.

[005] Such a cleaning device is described, for example, in Petition 870260016560, dated 23 / 02 / 2026, page 6 / 53 2 / 13 document DE 3446902 A1.

[006] Furthermore, a cleaning device with a paddle-like cleaning element is known from document EP 1081329 B1. This paddle-like cleaning element is engaged with the drill spirals, to engage in the spiral spaces and clean them of remaining soil material.

[007] Document EP 2749729 A1 discloses a drilling apparatus with a cleaning device, in which the cleaning element is mounted rotatably around the drill bit and is driven by a torque motor. Through a drive unit, the cleaning element can rotate around the drill bit and thus, during an adjusted extraction movement of the drill bit, release the spiral spaces of remaining soil material. However, this arrangement requires a power supply via hydraulic or electrical lines, which is associated with high costs. Running power lines in the region close to the drill hole, where the cleaning device is essentially located, eliminates the risk of damage during operation.Furthermore, the rotational movement of the cleaning element via the torque motor and the extraction movement of the drill bit are precisely matched, as otherwise damage to the cleaning element and the drill bit could occur.

[008] A generic type cleaning device is known from document EP 0744525 B1. This cleaning device has a retainer with a guide tube fixed in place. On the lower side of the guide tube, via an axial bearing, a cleaning device is mounted that rotates freely around the geometric axis of drilling, so that the cleaning device can rotate around the geometric axis of drilling.

[009] For cleaning with this device it is expected that Petition 870260016560, dated 23 / 02 / 2026, page 7 / 53 3 / 13 drive this initially to an upper terminal region of the mast, so that the cleaning device, by virtue of its own weight, can move downwards when the drill bit is extracted. Thus, the cleaner that engages in the spiral space can pass through the spiral space in a spiral shape and thus remove remaining soil material. In this arrangement, the intended axial bearing is exposed not only to axial forces, but also to considerable transverse forces, so the functionality and lifespan of the axial bearing and the arrangement are generally compromised.

[0010] The present invention aims to provide a device for cleaning the spiral space of a drill bit and a method for doing so, with which the cleaning of the spiral spaces of a drill bit can occur in a simple and safe manner.

[0011] The objective is achieved, according to the present invention, on the one hand, by means of a device having the characteristics of claim 1 and, on the other hand, by means of a method having the characteristics of claim 11. Preferred embodiments of the present invention are indicated in the dependent claims.

[0012] The device according to the present invention is characterized by the fact that the guide tube is mounted in the retainer in a rotary manner around the geometric axis of the tube; that the cleaning element is fixedly installed in the guide tube in a rotary manner; that, for cleaning, the guide tube is fixed in an axial manner in the direction of the geometric axis of drilling; and that, through a method of extracting the drill bit, the cleaning element with the guide tube for cleaning the drill bit can be offset around the geometric axis of drilling in the direction of rotation.

[0013] A basic idea of ​​the present invention consists of assembling Petition 870260016560, dated 23 / 02 / 2026, page 8 / 53 4 / 13 The guide tube, which is traversed by the drill bit, rotates freely in the retainer. Due to the size of the guide tube, a secure and stable mounting in the retainer can be provided. The cleaning element is fixed to the guide tube mounted in a rotating manner, so that the cleaning element can be rotated freely with the guide tube. "Rotating freely," in the sense of the present invention, means that no active rotation drive is provided to rotate the cleaning element; however, the cleaning element, by virtue of cooperation with the helical geometry, can perform a rotational movement during extraction. The cleaning element can be installed in the guide tube in a releasable and / or displaceable manner.

[0014] Another aspect of the present invention is that, for cleaning, the guide tube is axially stationary relative to the drilling axis. This can be achieved, for example, by the fact that the retainer is fixed to a mast of a drilling machine. In general, in this case, the device is configured in such a way that, through a drill bit extraction method, the cleaning element, which engages in the spiral space of the drill bit, is phased into a rotation around the geometric drilling axis with the guide tube. Through the helical geometry and, especially, the geometry of the helical blade, an axial extraction movement of the tubular drill is converted into a rotational movement of the cleaning element together with the guide tube around the geometric drilling axis. In this case, an axial extraction movement and the rotational movement of the cleaning element adjust to each other in an automatic and passive manner.During the extraction process, the drill bit may rotate or remain stationary in a circumferential direction.

[0015] Through the present invention it is thus possible to achieve, in Petition 870260016560, dated 23 / 02 / 2026, page 9 / 53 5 / 13 a generally simple and long-lasting construction, without an expensive control or power supply for the cleaning device, safely cleaning a drill bit of remaining soil material.

[0016] A preferred embodiment of the present invention consists in the cleaning element having a cleaning plate with a receiving slot into which the drill bit engages. With the receiving slot, the cleaning plate encompasses the drill bit on the upper and lower sides by its free edge. The cleaning plate may then be configured in such a way that it extends fully or for an essential part of the radial dimension of the drill bit. This ensures safe passage of the cleaning plate through the drill bit and scraping of the soil material.

[0017] According to a development of the device according to the present invention, it is advantageous that the cleaning plate comprises a base plate body, in which at least one adjustment plate for forming the receiving slot is mounted in a movable manner. Preferably, two adjustment plates are provided, which form an upper edge and a lower edge of the receiving slot. Through the movability of the adjustment plates in the base plate body, the slot width can be adjusted and adapted to the respective thickness of the drill blade of a drill. Preferably, the adjustment plates are produced from a material that is especially wear-resistant, since they may come into contact with the drill spiral and scrape off soil material.

[0018] In the event of excessive wear of the adjustment plates, they can be easily loosened and replaced. Preferably, for retaining said adjustment plate, at least one threaded connection with elongated holes in the adjustment plate is provided. Petition 870260016560, dated 23 / 02 / 2026, page 10 / 53 6 / 13

[0019] The edges of the receiving slot of the cleaning element may come into contact with the axially moving drill bit during the cleaning operation, so that, due to the upward movement of the drill bit, a displacement is caused and, with that, a rotational movement of the cleaning element around the geometric axis of drilling.

[0020] To improve the movement of the cleaning element in adaptation to the movement of the drill bit, it is provided, according to another embodiment of the present invention, that at least one guide roller is rotatably mounted on the cleaning element to abut the drill bit spiral. Preferably, in this case, said at least one guide roller is arranged on the cleaning element in such a way that it abuts a lower side of the drill bit spiral. The lower side of the drill bit spiral is, in this case, the side opposite the upper side on which the soil material abuts. As the drill bit spiral is constantly not completely filled with soil material, a particularly careful positioning of the guide roller is thus achieved. This is further improved by the fact that the guide roller is spatially positioned behind the cleaning plate, so that the guide roller does not or hardly comes into contact with soil material.The guide roller acts as a kind of cam roller, which, together with the drill spiral, forms a sort of cam follower mechanism to convert the axial pulling motion of the drill bit into a rotary circular motion of the cleaning element and the guide tube.

[0021] Furthermore, a particularly good assembly of the guide tube, according to an embodiment of the present invention, is achieved by the fact that the retainer has an annular recess, in which the guide tube is mounted and received in a rotary manner. Petition 870260016560, dated 23 / 02 / 2026, page 11 / 53 7 / 13 The guide tube is mounted rotatably around the entire circumference, so that both axial and transverse forces can be safely received. Essentially, the guide tube is retained in a releasable and replaceable manner, so that when changing the drill bit, a simple adaptation to a changed diameter can be achieved by replacing the guide tube.

[0022] It is especially advantageous in this case that several support rollers are arranged in the annular receiver, with which the guide tube is mounted rotatably around the geometric drilling axis and axially fixed in relation to the geometric drilling axis. The support rollers are then mounted in the retainer, especially on an inner side of the annular receiver, with a corresponding geometric roller axis, which is axially directed to the geometric drilling axis. The support rollers are specially configured as support rollers, with an upper annular rib on the circumference of the guide tube resting on the support rollers. To prevent an upward axial displacement of the guide sleeve, a lower rib may also be installed on the periphery of the guide roller sleeve. The upper and lower annular ribs are then axially spaced at a value that corresponds approximately to the outer diameter of the transversely oriented support rollers.Support rollers arranged in this way are also known as tiger rollers.

[0023] Another advantageous configuration of the present invention consists in which the annular receiver is configured with two oscillating arms, which are mounted in an oscillating manner between a closed operating position, in which the oscillating arms oscillate together to form the annular receiver and are connected to each other via a releasable linking device, and an open position, in which the oscillating arms are oscillated laterally away from each other. Petition 870260016560, dated 23 / 02 / 2026, page 12 / 53 8 / 13 apart. This allows for an opening of the annular receiver, so that, for example, the drill bit can be easily removed laterally and changed. Furthermore, an oscillation of the annular receiver opening, when raising the drill bit, where a cleaning device is not yet necessary, removes it from the working area. This makes it possible for the cleaning device not to impede the passage of the drilling drive unit downwards along the mast, so that a passage of the drilling drive unit along the mast downwards towards the ground is possible.

[0024] When the drill is subsequently extracted, the oscillating arms mounted in an oscillating manner can be easily oscillated together again in the retainer and linked to each other again with a suitable connecting device, for example, a bolt pin.

[0025] It is especially advantageous in this case that the guide tube be separable for opening. Preferably, the guide tube can be opened into two half-shells, preferably each half-shell being retained in a swing arm. If necessary, the half-shells can also be moved away from the swing arms or fixed in the open state by means of a separate fixing device on the swing arms. Suitable connecting devices, for example, tension clamps or threaded connections, can also be provided on the outer periphery of the guide tube, so that when the guide tube is closed, the two half-shells are securely connected to each other again.

[0026] According to an embodiment of the present invention, it is convenient that the retainer has a slotted guide for sliding along the mast of the drilling apparatus and a fastening device for fixing the retainer to the mast. Petition 870260016560, dated 23 / 02 / 2026, page 13 / 53 9 / 13 Specifically, the retainer may have a sliding shoe, whereby the retainer and the drilling rig carriage are mounted slidingly along a guide on the mast, especially a Makler device. Displacement may occur in any suitable manner, especially by means of an adjusting cylinder or a pull cable. Clamps that can be operated manually or by power may be provided as a fastening device.

[0027] The present invention further comprises a drilling apparatus with a lower carriage, an upper carriage mounted thereon, and a mast along which a movable drilling drive unit with a driven drill bit is mounted, the device according to the present invention described above being arranged for cleaning. Specifically, the device is arranged in the mast region of the drilling apparatus. The drilling apparatus may especially be a pile drilling apparatus, the mast being arranged and mounted substantially vertically on a support apparatus with a lower carriage and upper carriage.

[0028] Furthermore, the present invention relates to a method for forming a hole in the ground with a drilling apparatus described above, wherein a drill bit is introduced into the ground to form the hole and then withdrawn again. When the drill bit is introduced, which may especially be a so-called auger bit that extends substantially along the entire length of the mast, soil material that may be deposited in the drilling spiral is removed.

[0029] It is within the scope of the present invention that, when the drill bit is extracted, an intermediate space of the drill bit spiral is cleared of remaining soil material by means of the device of Petition 870260016560, dated 23 / 02 / 2026, p. 14 / 53 10 / 13 in accordance with the present invention described. The method is then carried out using the device described above, and the advantages described above result.

[0030] Regardless of the method, the resulting borehole can be filled, preferably through a drill core tube, with hardenable mortar, especially a concrete slurry, to form a borehole or foundation pile.

[0031] The present invention is further described below with the aid of a preferred embodiment, which is schematically represented in the accompanying drawings. The drawings show:

[0032] Figure 1 - a perspective view of a device according to the present invention;

[0033] Figure 2 - a front view of the device in figure 1;

[0034] Figure 3 - a top view of the device in figures 1 and above; and

[0035] Figure 4 - a partial perspective view of the device according to figures 1 to 3 with the guide tube removed.

[0036] As can be seen from figures 1 to 3, the device according to the present invention 10 for cleaning a spiral space of a drill bit not shown has a retainer 12 with a base body 14 in the shape of a carriage. On a rear side of the base body 14, sliding shoes are arranged to form a carriage guide, with which the retainer 12 is guided and fixed in a sliding manner along a linear guide on a mast, especially a Makle device, of a drilling apparatus. The carriage guide 16 may correspond to the guide in a drilling drive unit on the mast of the drilling apparatus.

[0037] On its front side, retainer 12 has a reception Petition 870260016560, dated 23 / 02 / 2026, p. 15 / 53 11 / 13 annular 50 usually arranged horizontally during operation, which is formed by two oscillating arms 52. The oscillating arms 52 are mounted in an oscillating manner, via a respective oscillating joint 56 in the base body 14 and the retainer 12, between a closed operating position, which is represented in the figures, and an open position, in which the oscillating arms 52 are tilted laterally outwards around the respective oscillating joint 56. In the operating position, the oscillating arms 52 are connected in a releasable manner via a connecting device 54. In the example embodiment shown, the connecting device 54 has a vertically oriented bolt pin.

[0038] In the closed operating position of the annular receiver 50, a guide tube 20 is received in it and rotated around a vertically oriented geometric drilling axis 5. An inner diameter of the guide tube 20 is adapted to an outer diameter of the drill bit (not shown), so that the drill bit is received in the guide tube 20 in a conductive and rotatable manner. The guide tube 20 can be divided into two parts, which is indicated schematically by a dividing line 24 in the guide tube 20 that extends axially.

[0039] When opening the annular receiver 50, the guide tube can also be held and removed with a hook-mounted lifting tool, with eyelets 26 arranged on the upper side of the guide tube 20 for corresponding attachment of the lifting tool.

[0040] The guide tube 20 passes through the annular receiver 50, and at one lower end of the guide tube 20, a cleaning element 30 is fixed with a removable and movable cleaning retainer 37. The cleaning retainer 37 has a base body of plates 34 with a receiving slot 38. The slot Petition 870260016560, dated 23 / 02 / 2026, p. 16 / 53 Receiving slot 38 is configured for lateral reception of a drill bit drilling spiral. To adapt to the drill bit geometry, a plate 32 with upper and lower adjustment plates 36 is provided in the base body of plates 34. The upper and lower adjustment plates 36 are fixed in a movable manner, via threaded connections and corresponding elongated holes in the adjustment plates 36, for displacement of the geometry and width of the receiving slot. The cleaning retainer 37 may have an oscillating articulation, around which the cleaning element 30 can be oscillated from a cleaning position on the drill bit to a release position.

[0041] Furthermore, the cleaning element 30 has a radially oriented guide roller 40, which is arranged and configured in such a way that it rests against a lower or upper side of the drilling spiral. The guide roller 40 can then roll on the drilling spiral, so that, when there is an axial traction movement of the drill bit vertically upwards, due to the upward movement of the drilling spiral, a force is exerted in a circumferential direction on the cleaning element 30 and, consequently, on the fixedly attached guide tube 20.

[0042] In this case, according to the present invention, the guide tube 20 is mounted rotatably around the vertically oriented geometric axis 5. For this purpose, the guide tube 20 has two annular ribs 22 on its outer side, of which only the upper annular rib 22 can be seen in Figures 1 and 3. With the upper annular rib 22, the guide tube 22 (sic) (20) rests on radially oriented support rollers 60 on an inner side, giving an annular reception 50, the support rollers 60 being represented in Figure 4. In the embodiment shown, two support rollers 60 are arranged on a respective arm of the two oscillating arms 52 with the geometric axis of the roller oriented Petition 870260016560, dated 23 / 02 / 2026, p. 17 / 53 13 / 13 radially. In guide tube 20, the lower annular rib is axially distanced downwards from the upper annular rib 22 by a value that corresponds more or less to the diameter of the support rollers 60, so that guide tube 20 is received in a rotary manner, but axially fixed in the annular receiver 50.

[0043] Due to the described geometry, during an axial extraction of the drill bit with a certain drill bit rise, a force can be exerted on the cleaning element 30 with the guide roller 40, so that the guide tube 20, mounted in a freely rotating manner with the cleaning element 30 installed, can be offset to a circumferential movement around the geometric drilling axis 5. In this case, the cleaning plate 32, which engages in an intermediate space of the drill bit's drilling spiral, passes through it and can thus scrape off any remaining soil material on the oscillating spiral.

[0044] For facilitated ejection of soil material through the cleaning plate 32, which is adapted to the intermediate spiral space in the radial and axial dimensioning direction, a recess 28 is provided in a lower region of the guide tube 20 for ejection of soil material. Petition 870260016560, dated 23 / 02 / 2026, page 18 / 53

Claims

1 / 3 CLAIMS 1. Device for cleaning an intermediate spiral space of a drill bit, with - a retainer (12) for retaining the device (10) on a mast of a drilling apparatus, - a guide tube (20), which surrounds the drill bit with a drilling spiral in a terminal manner and is mounted on the retainer (12), and - a cleaning element (30), which engages in the intermediate spiral space and is mounted in a freely rotatable manner around a geometric drilling axis (5) in the retainer (12), wherein the guide tube (20) is mounted in the retainer (12) in a freely rotatable manner around the geometric drilling axis (5), wherein the cleaning element (30) is fixedly installed in the rotatably mounted guide tube (20), wherein, for cleaning, the guide tube (20) is axially fixed in the direction of the geometric drilling axis (5) and wherein, by means of a drill bit extraction method,the cleaning element (30) with the guide tube (20) can be offset by one rotation around the geometric drilling axis (5) for cleaning the drill bit, characterized in that the cleaning element (30) has a cleaning plate (32) with a receiving slot, in which the drilling spiral engages.

2. Device according to claim 1, characterized in that the cleaning plate (32) encompasses with the receiving slot (38) an upper side and a lower side of the drilling spiral by the free edge of the drilling spiral.

3. Device according to claim 2, characterized in that the cleaning plate (32) comprises a Petition 870260016560, dated 23 / 02 / 2026, page 19 / 53 2 / 3 base plate body (34), in which at least one adjustment plate (36) is mounted in a movable manner for forming the receiving slot (38).

4. Device according to any one of claims 1 to 3, characterized in that, in the cleaning element (30), at least one guide roller (40) is rotatably mounted to engage with a drilling spiral of the drill bit.

5. Device according to any one of claims 1 to 4, characterized in that the retainer (12) has an annular recess (50), in which the guide tube (20) is mounted and received in a rotary manner.

6. Device according to claim 5, characterized in that, in the annular receiver (50) there are several support rollers (60), with which the guide tube (20) is mounted in the retainer (12) in a rotary manner around the geometric drilling axis (5) and axially fixed in relation to the geometric drilling axis (5).

7. Device according to claim 5 or 6, characterized in that the annular receiver (50) is configured with two oscillating arms (52), which are mounted in an oscillating manner between a closed operating position, in which the oscillating arms (52) are oscillated together to form the annular receiver (50) and are connected to each other via a releasable linking device (54), and an open position, in which the oscillating arms (52) are oscillated laterally away from each other.

8. Device according to any one of claims 1 to 7, characterized in that the guide tube (20) can be split for opening.

9. Device according to any one of claims 1 to 8, characterized in that the retainer (12) Petition 870260016560, dated 23 / 02 / 2026, p. 20 / 53 3 / 3 has a carriage guide (16) for movable guide along the mast of the drilling apparatus and a fastening device for fixing the retainer (12) to the mast.

10. Drilling apparatus with a lower carriage, an upper carriage mounted on it and a mast, along which a movable pipe drive unit is mounted with a driven drill bit, characterized in that a device (10) is arranged as defined in any one of claims 1 to 9.

11. Method for forming a borehole in the ground with a drilling apparatus according to claim 10, wherein a drill bit is introduced into the ground to form the borehole and then withdrawn again, characterized in that, when the drill bit is withdrawn, an intermediate spiral space of the drill bit is cleared of remaining soil material by means of a device (1) as defined in any one of claims 1 to 9. Petition 870260016560, dated 23 / 02 / 2026, page 21 / 53

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