EP2407629B1 - Drilling device and drilling method - Google Patents

Description

The invention relates to a drilling apparatus with a drill for drilling within a casing pipe, wherein the drill has a support frame with a fixing device for fixing against the casing pipe and a drilling tool which is driven in rotation via a telescopic linkage by means of a drill drive, which is arranged on the support frame.

The invention further relates to a drilling method for creating a bore within a casing tube, wherein a support frame of a drilling device is fixed relative to the casing tube and a drilling tool is rotationally driven by means of a support frame arranged on a drill string telescoping linkage, whereby soil removed as cuttings within the casing tube and in the Drilling tool is added.

Such a drilling device and such a drilling method are known from EP 1 154 078 B1 or DE 101 55 105 C1 , which is considered to be the closest state of the art technology. To create a bored pile in which substrate a jacket pipe is first pressed or screwed by means of a known insertion device. Subsequently, a drill with a support frame via a crane device is used to remove the soil material within the casing tube. The support frame is clamped at the upper end of the jacket tube. As a drilling tool, a box drill is used, which is discharged by means of the crane device via a telescopic Kellygestänge. The drilling tool of the drill is rotationally driven by the Kelly linkage by a drill drive which is located on the clamped support frame.

As soon as the receiving space of the box drill is filled with removed soil material, the drilling tool is raised again via the crane device. Subsequently, the support frame is released from the jacket tube and the drill is pivoted overall laterally to the jacket tube. In this position, the box drill is emptied.

In order to continue the drilling process, the drill is then placed back onto the casing tube, clamped the support frame and drained the drill again.

When the drilling operation is completed, the drill rig is completely removed by means of the crane device, and the resulting cavity within the casing tube can be filled, for example, by introducing a steel reinforcing cage and a concrete mass to form a foundation pile.

This drilling process is overall very economical, since the drill can be moved to the completion of drilling on the crane device to another jacket tube, so that immediately after the next hole can be started. Since the drill can be moved quickly and efficiently via a cable suspension on a crane device, so to speak, a "flying drill" is created.

The placement of the drill on the jacket tube and the clamping of the support frame requires in unfavorable weather conditions, such as in poor visibility or strong winds, a high degree of experience and skill of the operator in the crane device. Fluctuation movements of the crane rope suspended drill can delay the workflow.

From the US 2 631 013 A is a drilling device with Bohrhreimen out, the drill drive is spaced from the jacket tube.

The invention has for its object to provide a drilling apparatus and a drilling method, with which an efficient creation of a hole in a casing pipe is possible even under adverse weather conditions.

The object is achieved by a drilling device with the features of claim 1 or by a drilling method with the features of claim 8. Preferred embodiments of the invention are specified in the respective dependent claims.

The drilling apparatus according to the invention is characterized in that an emptying station is provided for attachment to the upper end of the casing tube, wherein the support frame of the drilling device can be fastened to the emptying station, that the emptying station for emptying the drilling tool of cuttings has an unloading device which is adjustable for receiving the cuttings is, and that the unloading device is designed for conveying the cuttings from the emptying station.

A basic idea of the invention lies in the fact that the drilling device no longer has to be detached from the jacket tube during the creation of the bore, that is to say, for example, for emptying the drilling tool or when carrying out measuring or maintenance operations. The drill is therefore connected to an attached to the upper end of the jacket tube discharge station. The emptying station can be connected via a releasable attachment mechanism with the jacket tube. The drill is axially movable to the jacket tube in the emptying station in a holding position. In this position, the drilling tool can be emptied via an unloading device integrated in the emptying station, wherein the unloading device is brought into a position for discharging the cuttings.

The workflow is simplified as a whole, as a frequent loosening and re-adjusting and fixing the support frame is eliminated. It is possible to work, which is largely independent of weather conditions. In this way, the drilling device according to the invention can be used for example in the offshore area for the creation of foundation piles in the seabed. Strong winds on the sea as well as fluctuation movements of a crane device arranged on a vessel thus have hardly any influence on the workflow.

In principle, a wide variety of drilling tools can be used on the drill. Particularly advantageous according to the invention are discontinuous drilling tools, including augers count, which screw into the ground. For working in soft soil or under water, it is advantageous according to the invention that the drilling tool is designed as a box drill with a bottom which can be opened to empty the box drill.

A further development according to the invention consists in that the unloading device has an actuating member, by which during the adjustment of the unloading device in and / or the bottom of the box drill is opened or closed from the unloading position. In a known manner, the hinged floor initially has an opening with a cutting device, so that soil material can be removed and passed through the opening in the cylindrical receiving space of the box drill. Within the box drill, in certain embodiments, a screw may be arranged as an additional conveyor. When the receiving space is filled, the opening is closed by turning the bottom, so that the box drill is withdrawn with the removed soil material from the casing pipe into the emptying station. Subsequently, the unloading device is brought into an intended for emptying position, wherein the bottom of the box drill can be opened and emptied via the actuator. This can be realized, for example, that is moved by adjusting the unloading the box drill against a stop, which opens by pressing a latch mechanism, the bottom of the box drill. As soon as the drill cuttings have been picked up or removed from the box drill by the unloading device, an opened bottom of the box drill can be closed again by adjusting the unloading device from the unloading position. For example, the unloading device could have an actuating element as a ramp-shaped actuating element, which presses the unfolded bottom back into its closed position by a sliding movement, wherein the closure of the bottom is locked again. Following this, the drilling tool can be released through the telescopic linkage back into the jacket tube, and the bore can be continued.

In principle, the most varied forms of unloading device can be integrated in the emptying station. The unloading device can be designed, for example, as an adjustable conveyor belt, on which the removed cuttings can be transported away. It could also be used a suction device with which the cuttings are sucked out of the drilling tool.

However, it is particularly preferred according to the invention that the unloading device has a chute, which is pivotable about a pivot axis in an inclined position. For example, the chute may be mounted laterally near the drilling axis at the emptying station so as to be below the drilling tool can be brought into an inclination and receives in this position the cuttings.

A further preferred embodiment of the invention results from the fact that the chute between a retreat position and the unloading position about the pivot axis is pivotable, and that the chute in the unloading position has the inclination, wherein the cuttings from the emptying station can be derived. The chute may be located, for example, in a holder near the jacket tube. In this retreat position, the surface of the chute can be mounted approximately parallel to the jacket tube. The drilling tool can be moved unhindered along the drilling axis in this way. As soon as the drilling tool has been moved out of the casing tube into the emptying station after a drilling step, the chute can be moved into an unloading position in which it is located in an inclined position below the drilling tool. The adjustment process can for example be realized in that the chute is connected at the lower edge via a rotary joint with the emptying station and is pivoted about this hinge in an inclined position below the drilling tool.

A further preferred embodiment of the invention results from the fact that the emptying device has a trolley, which is movable between the unloading position and a discharge position for conveying the cuttings from the emptying station along a path. The trolley could, for example, be moved by rollers along a rail between the unloading position and a discharge position, wherein the drive of the trolley can be realized in various ways. For example, the car could have its own engine to power itself. But it would also be possible other forms of drive in which the car is pulled with hoist winch and rope or moved at short distances via a hydraulic cylinder along the track. The power to operate can either be derived from the drill or provided by a stand-alone power supply to the discharge station. The trolley is formed with a loading surface with which the cuttings can be picked up from the drilling tool when the carriage is in the unloading position. The loading area could for example be realized in the form of a dump body with which the drill cuttings can be tipped away from the discharge station as soon as the transport carriage is in the removal position. Alternatively, it is also possible that the loading area of the trolley a hinged bottom over which the cuttings is dumped in Abförderposition down. The dumped material could then be picked up by a disposal system located next to the emptying station. This could be, for example, a container, a truck, a conveyor, a transport ship, etc.

According to the invention, it is preferred that the emptying station has a coupling device for fastening to the jacket tube and a platform which can be adjusted relative to the coupling device by means of an adjusting device. The coupling device is connected via suitable fastening devices, such as clamping jaws, releasably connected to the jacket tube. The attached to the coupling device platform can be adjusted via the adjusting device in various ways with respect to the opening of the jacket tube. As a result, for example, the platform can be angled relative to the jacket tube. For example, the platform can still be brought into a horizontal position in the case of a bore inclined obliquely to the vertical. A lifting of the platform relative to the jacket tube would be feasible. Such an adjusting device can also be seen as an independent idea of the invention without or only with a part of the aforementioned features and used on other attachment devices on jacket pipes.

With regard to the drilling method, the invention is characterized in that the support frame of the drill is attached to an emptying station, which is arranged at an upper end of the jacket tube, that is moved to unload the cuttings from the drilling tool from the casing pipe in the emptying station that a Unloading is adjusted at the discharge station in an unloading position for receiving the cuttings from the drilling tool, and that the cuttings are removed by the unloading from the discharge station.

As described above, an acceleration and simplification of the workflow is achieved by the emptying station according to the invention.

A preferred method according to the invention consists in that, by moving the drilling tool, which is designed as a box drill with a hinged bottom, into the emptying station against a stop, the bottom of the box drill is opened for emptying. The box drill could also have a Turn on a locking mechanism, in which the bottom of the box drill is opened to empty.

A further preferred embodiment of the invention is that the unloading device is arranged in the unloading position for receiving the cuttings below the drilling tool. This unloading position of the unloading device has the advantage that the unloading process largely takes place by means of gravity and therefore usually no further active systems have to be used for emptying the drilling tool.

Furthermore, it may be advantageous according to the invention that the unloading device has a chute, which is pivoted about a pivot axis in an inclined position in the unloading position, and that is discharged via the inclined chute cuttings from the discharge station. The chute can be brought in various ways in the unloading position. It is for example possible that the chute is folded out or moved from a rest position to the unloading position or that it is rotated with respect to an axis parallel to the longitudinal side of the jacket tube in the unloading position. The conveyance of the cuttings is caused by the inclination of the chute relative to the horizontal.

A particular embodiment of the invention is given by the fact that the unloading device has a trolley, which is moved between the unloading position and a discharge position along a path that in the unloading the cuttings from the drilling tool is emptied into the trolley and that in the discharge position the cuttings is conveyed away from the trolley from the emptying station. The trolley is moved over the aforementioned drive forms between the unloading position and the discharge position along the path. The process of the trolley and the inclusion or the removal of the cuttings can be controlled both automatically and manually.

It is further provided according to the invention that when adjusting the unloading in and / or from the unloading position, a bottom of a box drill, which is used as a drilling tool, is opened or closed. The locking mechanism of the bottom of the box drill could for example be activated by the chute or the loading area of the trolley is moved along the bottom of the box drill, and the soil is thereby opened or closed.

Another preferred method according to the invention consists in the fact that the emptying station is fastened with a coupling device on the jacket tube, and that a platform of the emptying station is adjusted by means of an adjusting device relative to the coupling device. The adjusting device has the task to adjust the position of the platform with respect to the casing tube so that favorable conditions are created for the drilling process. This could be adjusted for example by one or more actuating cylinder different angles between the platform and the transverse axis of the jacket tube. Also shifts of the platform in horizontal or vertical plane could be stopped.

Further, it is provided according to the invention that the jacket tube is introduced into the ground, in particular pressed. For this purpose, a known pressing device can be used. Further, it is according to the invention that the emptying station is releasably secured to the casing pipe, and that then filled into the created bore in the casing pipe concrete mass and a bored pile is formed.

According to a further aspect of the invention, this comprises an emptying station with a coupling device for attachment to a casing tube, a receiving section for receiving and holding a drill with a drilling tool and an unloading device for emptying the drilling tool and picking up cuttings from the drilling tool, wherein the unloading device for discharging the Cuttings from the unloading station is formed. This emptying station can be used in particular for the above-described drilling device and the aforementioned drilling method, so that the advantages thus described can be achieved.

Fig. 1

eine schematische Seitenansicht einer ersten erfindungsgemäßen Entladestation;

Fig. 2

schematische Seitenansichten bei der Durchführung des erfindungsgemäßen Bohrverfahrens mit der Entladestation nach Fig. 1;

Fig. 3

eine schematische Seitenansicht einer zweiten erfindungsgemäßen Entladestation;

Fig. 4

schematische Seitenansichten eines weiteren erfindungsgemäßen Bohrverfahrens mit einer Entladestation nach Fig. 3; und

Fig. 5

eine schematische Teilquerschnittsansicht eines erfindungsgemäßen Bohrgerätes.

The invention will be further described by means of preferred embodiments, which are shown schematically in the drawings. In the drawings show:

Fig. 1

a schematic side view of a first discharge station according to the invention;

Fig. 2

schematic side views when carrying out the drilling method according to the invention with the unloading station according to Fig. 1 ;

Fig. 3

a schematic side view of a second discharge station according to the invention;

Fig. 4

schematic side views of a further drilling method according to the invention with an unloading station according to Fig. 3 ; and

Fig. 5

a schematic partial cross-sectional view of a drilling device according to the invention.

A first unloading station 20 according to the invention Fig. 1 has a platform 30 constructed of steel profiles. On the underside of the platform 30, a coupling device 34 is arranged for releasably securing to a jacket tube 5. The coupling device 34 comprises a sleeve body 40 with a lower conical enlargement, the inner diameter of which can be narrowed by means of hydraulic clamping cylinders 42. In this way, the sleeve body 40 can be frictionally applied to the outer circumference of the jacket tube 5 and connected thereto.

The sleeve-shaped body 40 is pivotally mounted about a horizontal axis about the platform 30 via a pivot joint 44. With an oppositely arranged pivoting cylinder 32, an adjusting device 31 is formed, with which the platform 30 can be angled relative to the coupling device 34 via the pivot joint 44.

At the top of the platform 30, a frame 26 is formed by means of vertical supports, on the upper side of a sleeve-shaped receptacle 70 is arranged. The sleeve-shaped receptacle 70 has approximately the diameter of the jacket tube 5, on which the unloading station 20 is to be attached. The sleeve-shaped receptacle 70 is used to attach a drill, which in connection with Fig. 5 is described.

Furthermore, according to the invention, an unloading device 25 is provided on the platform 30. In the present embodiment, this has a chute 36, which is pivotable about a pivot axis 38 by means of an actuating cylinder 39 between the illustrated retreat position and an unloading position.

On the frame 26 a stop 37 is further arranged, which serves for actuating the drill. Furthermore, a crane suspension 12 is arranged, so that the unloading station 20 can be transported by means of a crane to and from the jacket tube 5.

According to Fig. 2 An exemplary drilling method according to the invention is schematically illustrated by means of eight working steps. First, in a known manner, a jacket tube 5, which can also be called support or drill pipe, driven in a known manner by vibrators, ramming or pressing in a soft ground. In the illustrated embodiment, the jacket tube 5 is introduced into a body of water with a helix angle to the vertical. About a crane 1, which is arranged for working on water on a pontoon 2, the unloading station 20 according to Fig. 1 transported to the top of the jacket tube 5 (step 1.). The coupling device 34 with an enlarged diameter is placed in accordance with the step 2. By tightening the clamping cylinder 42, a frictional connection of the coupling device 34 with the upper end of the jacket tube 5. The adjusting device 31 is adjusted so that the platform 30 of the emptying station 20 occupies a horizontal position, while the sleeve body 40 coaxial with the longitudinal axis of the jacket tube. 5 is arranged.

Subsequently, according to step 3, a drill 100 with a box drill as a drilling tool 140 is inserted into the cylindrical receptacle 70. The drill 100 will be described below in connection with Fig. 5 explained in more detail.

According to step 4, the drill 100 is clamped over its support frame 110 at the upper edge of the cylindrical receptacle 70, so that now via the discharge station 20 with the coupling device 34 is a fixed connection with the jacket tube 5.

Subsequently, according to step 5, the adjusting device 31 is adjusted such that the drill 100 is brought from its vertical position to an inclined position in which the axis of the drill 100 is arranged coaxially with the longitudinal axis of the jacket tube 5. During these steps, the unloading device 25 is in an illustrated retreat position, which allows a free passage of the drilling tool 140 of the drill 100 through the unloading station 20 into the interior of the casing tube 5 for removing soil material.

According to step 6, the deepest and therefore last drilling step is already shown at the lower end of the jacket tube 5. Once the trained as a box drill drill 140 is filled with abraded soil material within the casing tube 5, the telescopic Kelly rod 7 is retracted again via the crane 1 until the drilling tool 140 is arranged in a desired holding position in the emptying station 20 in accordance with step 7. A chute 36 of the unloading station 26 can now be pivoted into an unloading position in accordance with step 7. By opening the drilling tool 140, drill cuttings can now be removed from the drilling tool 140. This cuttings is discharged via the inclined chute 36 directly under gravity to the outside of the unloading station 20 to a discharge device 50. The discharge device 50 can be a transport ship. By rotating the drilling tool 140, the drilling tool 140 can be closed again with the assistance of a stop 37 and by the withdrawal movement of the chute 36, as in step 8. of Fig. 2 is shown. Subsequently, the drilling tool 140 could be drained back into the casing tube 5 for performing a further drilling step.

After drilling the hole to the desired final depth, the drilling tool 140 is withdrawn again and the drilling apparatus 10 with the unloading station 20 and the drill 100 can be removed from the jacket tube 5. The cavity of the jacket tube 5 can then be filled with reinforcing steel and concrete mass to form a bored pile. When filling the jacket tube 5 can be pulled and optionally reused. Alternatively, the jacket tube 5 also remain in the ground, so that a bored pile is formed with sheath.

According to Fig. 3 a second unloading station 20 'is shown. This also has a platform 30 with a coupling device 34, as in connection with the unloading station 20 of Fig. 1 was explained. Furthermore, at the top of the platform 30, a frame 26 is provided with a cylindrical receptacle 70 for attachment of a drill.

In contrast to the unloading station 20 according to Fig. 1 is the sleeve-shaped receptacle 70 of the unloading station 20 'of Fig. 3 pivotally mounted about an axis 72 on the frame 26. The pivoting of the sleeve-shaped receptacle 70 takes place via two lateral pivoting cylinders 74, so that the pivoting of the receptacle 70, the pivoting of the adjusting device 31 for aligning the unloading station 20 is improved with respect to a possibly inclined casing pipe.

Furthermore, in contrast to the unloading station 20 according to Fig. 1 a modified unloading device 25 is provided.

The unloading device 25 according to Fig. 4 includes a trolley 28 which is movable along a rail 29 formed by rails on the platform 30 between the unloading position shown and an outward discharge position. The trolley 28 has for this purpose on its underside rollers 33. Furthermore, the receiving area of the trolley 28 is designed as a chute 36, which can be actuated by means of an adjusting cylinder 35.

Fig. 4 shows similar Fig. 2 a further drilling method according to the invention in eight steps with the discharge station 20 'of Fig. 3 ,

The emptying station 20 'according to the drilling after Fig. 2 attached to the jacket tube 5. Subsequently, the drill 100 is coupled to the cylindrical receptacle 70. Furthermore, the trolley 28 is moved to an external retreat position according to step 3.

The vertically directed cylindrical receptacle 70 is angled and aligned by operating the pivot cylinder 74 coaxially with the axis of the jacket tube 5, as step 4. can be seen. Subsequently, in several drilling steps, the drilling tool 140 of the drill 100 can be sunk according to the maximum length L of the Kelly bar 7, as shown in step 5.

According to step 6, after each drilling step with filling of the drilling tool 140, this is moved back into the emptying station 20 '. Subsequently, the trolley 28 is moved to the unloading position below the drilling tool 140, wherein simultaneously or subsequently the drilling tool 140 is opened and the cuttings are unloaded from the drilling tool 140 in the trolley 28. With simultaneous closing of a hinged bottom of the drilling tool 140 by an actuator 22 on the trolley 28 according to step 7. The trolley 28 is moved into a discharge position outside the discharge station 20 '. In this discharge position then a chute 36 of Abförderwagens 28 is tilted so that the cuttings from the chute 36 is removed. Subsequently, a further drilling step with the drilling tool 140 can be carried out in accordance with the operating step 8.

A preferred drill 100 is shown in FIG Fig. 5 shown. The drill 100 has a support frame 110 which is provided at its lower end with transverse struts 117. On the underside of the transverse struts 117, attachment brackets 111 are arranged on the one hand, with which the drill 100 can be placed on an upper edge of the sleeve-shaped receptacle 70 of the unloading station 20. Offset to the attachment brackets 111, one or more attachment devices 114 are provided which have hydraulically actuable collets. With these collets, the support frame 110 can be rotatably attached to the receptacle 70.

Furthermore, a drill drive 116 for rotationally driving the drilling tool 160 via a telescopic linkage 130 is arranged on the support frame 110.

In the illustrated embodiment, the support frame 110 is formed in two parts with a support frame base 115 and an overlying support frame top 113. The support frame upper part 113, which is axially adjustable by means of hydraulic cylinders 112 with hydraulic cylinder pistons 112a relative to the support frame lower part 115, the drill drive 116 is fixed.

By loosening the fastening device 114, the drill 100 can be pulled out of the receptacle 70 upwards and then placed on a receptacle of another emptying station to create a further hole.

Claims (15)

1. Drilling device with a drilling apparatus (100) for drilling inside a casing tube (5), wherein the drilling apparatus (100) has a supporting frame (110) with a fastening means (114) for fixation with respect to the casing tube (5) and a drilling tool (140), which is driven in a rotating manner via a telescopic rod (130) by means of a drill drive (116) arranged on the supporting frame (110),
   characterized in that

   - an emptying station (20) for attachment to the upper end of the casing tube (5) is provided, wherein the supporting frame (110) of the drilling apparatus (100) can be fastened on the emptying station (20),

   - in that in order to empty the drilling tool (140) of drill cuttings the emptying station (20) has an unloading means (25) which is adjustable for receiving the drill cuttings and

   - in that the unloading means (25) is designed for conveying the drill cuttings away from the emptying station (20).
2. Drilling device according to claim 1,
   characterized in that
   the drilling tool (140) is designed as a drilling bucket with a bottom (142) which can be hinged open for emptying the drilling bucket.
3. Drilling device according to claim 1,
   characterized in that
   the unloading means (25) has an actuation member (22), by which the bottom (142) of the drilling bucket is opened or closed during adjustment of the unloading means (25) into and/or out of the unloading position.
4. Drilling device according to any one of claims 1 to 3,
   characterized in that
   the unloading means (25) has a chute (36) which is pivotable about a pivot axis (38) into an inclined position.
5. Drilling device according to claim 4,
   characterized in that

   - the chute (36) is pivotable about the pivot axis (38) between a retracted position and the unloading position and

   - in that in the unloading position the chute (36) is in the inclined position, in which the drill cuttings can be led out of the emptying station (20).
6. Drilling device according to any one of claims 1 to 4,
   characterized in that
   the unloading means (25) has a conveyor carriage (28) which is movable along a path (29) between the unloading position and a conveying-away position for conveying the drill cuttings away from the emptying station (20).
7. Drilling device according to any one of claims 1 to 6,
   characterized in that
   the emptying station (20) has a coupling means (34) for fastening on the casing tube (5) and a platform (30), which is adjustable by means of an adjusting means (31) with respect to the coupling means (34).
8. Drilling method for producing a borehole inside a casing tube (5) by means of a drilling device (10) according to any one of claims 1 to 7, wherein a supporting frame (110) of a drilling apparatus (100) is fixed with respect to the casing tube (5) and, by means of a drill drive (116) arranged on the supporting frame (110), a drilling tool (140) is driven in a rotating manner via a telescopic rod (130), whereby soil material is removed as drill cuttings inside the casing tube (5) and received in the drilling tool (140),
   characterized in that

   - the supporting frame (110) of the drilling apparatus (100) is fastened on an emptying station (20), which is arranged at an upper end of the casing tube (5),

   - in that for unloading the drill cuttings from the drilling tool (140) this is moved out of the casing tube (5) into the emptying station (20),

   - in that an unloading means (25) on the emptying station (20) being adjusted into an unloading position for receiving the drill cuttings from the drilling tool (140), and

   - in that through the unloading means (25) the drill cuttings are conveyed away from the emptying station (20).
9. Drilling method according to claim 8,
   characterized in that
   through movement of the drilling tool (140), designed as a drilling bucket with hinged bottom (142), into the emptying station (20) against a stop the bottom of the drilling bucket is opened for emptying.
10. Drilling method according to claim 8 or 9,
    characterized in that
    the unloading means (25) has a chute (36), which is pivoted about a pivot axis (38) into an inclined position in the unloading position, and in that via the inclined chute (36) drill cuttings are led out of the emptying station (20).
11. Drilling method according to any one of claims 8 to 10,
    characterized in that

    - the unloading means (25) has a conveyor carriage (28) which is moved along a path (29) between the unloading position and a conveying-away position,

    - in the unloading position the drill cuttings are emptied from the drilling tool (140) into the conveyor carriage (28), and

    - in that in the conveying-away position the drill cuttings are conveyed away from the emptying station (20) by the conveyor carriage (28).
12. Drilling method according to any one of claims 8 to 11,
    characterized in that
    during adjustment of the unloading means (25) into and/or out of the unloading position a bottom (142) of a drilling bucket, which is used as a drilling tool (140), is opened or closed.
13. Drilling method according to any one of claims 8 to 12,
    characterized in that
    the emptying station (20) is fastened with a coupling means (34) on the casing tube (5) and in that a platform (30) of the emptying station (20) is adjusted by means of an adjusting means (31) with respect to the coupling means (34).
14. Drilling method according to any one of claims 8 to 13,
    characterized in that
    the casing tube (5) is introduced into the soil,
    the emptying station (20) is fastened in a detachable manner on the casing tube (5) and
    in that subsequently a concrete mass is filled into the produced borehole in the casing tube (5) and a drilled pile is formed.
15. Emptying station for a drilling device (10) according to any one of claims 1 to 7 or a drilling method according to any one of claims 8 to 14, comprising

    - a coupling means (34) for fastening on a casing tube (5),

    - a receiving section (70) for receiving and retaining a drilling apparatus (100) with drilling tool (140) and

    - an unloading means (25) for emptying the drilling tool (140) and for receiving drill cuttings from the drilling tool (140), wherein the unloading means (25) is designed for conveying the drill cuttings away from the emptying station (20).

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