EP2843138B1 - Method and device for producing ground piles - Google Patents

Description

The invention relates to a method and an apparatus for producing ground piles with extended pile heads.

From the DE 699 28 848 T2 For example, an apparatus for forming an enlarged head in a locally cast pile is known. The device has a collar which is releasably adapted to a lower end of a continuous threaded screw. Subsequently, the pile tool is introduced with the collar in the ground. Thereafter, the collar is decoupled from the pile tool, wherein the pile tool is then introduced without collar further into the ground until reaching the desired depth. Subsequently, the pile tool is initially retracted with simultaneous supply of concrete or mortar to the lower end of the collar and then together with the collar, while concrete is supplied to fill the cavity.

From the EP 1 283 307 A2 For example, a method of making enlarged pile heads on precast piles is known. For this purpose is introduced by means of a Kopfformwerkzeugs in the ground to a desired depth. Thereafter, the prefabricated soil pile is placed in the ground to a depth below that of the cavity formed by the head mold, and the cavity is grouted with concrete or mortar to produce a head enlarged from the ground pile.

From the EP 1 698 731 A1 is a drilling tool for ground improvement by material columns in the ground known. The columns introduced into the ground have each a lower set column portion of settable material such as mortar or cement and an upper compacted column section of rolligem material such as gravel. In the manufacture of the lower column section, a hollow tool is drilled with displacement of the soil and introduced the hardenable material in pulling the hollow tool out of this in the borehole.

The present invention has for its object to provide a method for the production of soil piles with extended pile heads, which can be carried out quickly and efficiently. The object is further to propose a corresponding device, are quickly and easily produced with the ground piles with extended pile heads.

The solution consists in a method for producing ground piles with extended pile heads by means of a device comprising a drilling tool having a first outer diameter and a first rotary drive and an extension tool having a second outer diameter and a second rotary drive, wherein the first outer diameter is smaller than the second Outer diameter, and wherein the drilling tool is longitudinally movably guided in a tubular body of the expansion tool, comprising the steps of: drilling the expansion tool under rotary drive to a first depth T1; Drilling the drilling tool under rotating drive to a second depth T2 which is below the first depth T1, wherein the rotational speed of the expansion tool is reduced when drilling tool from the first depth T1 to the second depth T2; and pulling the drilling tool and the extension tool out of the ground with application of suspension, wherein the suspension fills a cavity formed by the tools when pulled.

The advantage is that the method enables soil piles with extended pile heads to be produced quickly and easily in a single operation. The head of the manufactured pile has a larger diameter than the main column. In this way, the introduced, for example, from a foundation of a building in the ground pile force is distributed over a larger area, so that the punctual load on the load on the ground pile structure or the bottom plate or the foundation is reduced. Both tools can be sunk to individual depths independent of each other in the ground due to the separate rotary actuators, resulting in a high degree of flexibility in the creation of the ground piles. In particular, the depth of the extended pile head can be adjusted individually, by appropriately lowering the expansion tool. The first rotary drive, which can also be referred to as the main drive, and the second rotary drive, which can also be referred to as a secondary drive, are independently controllable. The sinking of the expansion tool and the drilling tool can thus be done together, whereby the respective depth depths can be adjusted by appropriately controlling the rotary drives.

After a preferred process control, the extension tool is propelled without feed, solely by rotating drive of the associated rotary drive, sunk. By this is meant that no separate linear drive is provided to bring the expansion tool in the ground. Rather, the introduction into the ground is due to the weight of the expansion tool in combination with the rotational movement of the tool. Upon reaching the desired depth for the extended column head, the rotational speed of the rotary drive is reduced, in particular reduced to zero. By stopping the rotary motion, the expansion tool does not drill further into the ground, but remains in the depth reached T1.

For an efficient and time-saving implementation, it is favorable if the drilling tool and the expansion tool are sunk together to the first depth T1. By this is meant that the two tools are at least partially lowered with temporal overlap. When lowering the drilling tool and the extension tool are preferably driven in the same direction and / or preferably at the same speed. For example, the drilling tool and the expansion tool can each be driven at a speed of 15 to 30 revolutions per minute until reaching the first depth T1.

According to a preferred method of operation, upon further drilling down of the drilling tool from the first depth T1 to the second depth T2, the expansion tool remains in the lowered position (depth T1) and, when the drilling tool recovers the first depth T1 while pulling, together with it pulled further up. When pulling the expansion tool is stationary, that is, it is not driven in rotation, so that the soil located between the flights is dug with. This creates a cavity with an enlarged diameter D1 in the bottom. In this case, the diameter D1 of the first cavity, which later forms the enlarged column head, corresponds approximately to the largest outer diameter D9 of the expansion tool.

Preferably, the extension tool is coupled to the drilling tool such that the drilling tool when pulling from the depth T2 up and reaching the depth T1 entrains the expansion tool and both tools are pulled together from the ground. The lengthwise coupling of the two tools is effected in particular by means of a chain, one end of which is connected directly or indirectly to the expansion tool and whose other end is directly or indirectly connected to the drilling tool. In this case, an indirect connection can be made for example via the respective rotary drive or slide. The length of the chain is adjusted so that it tightens when pulling the drilling tool and when reaching the first depth T1, so that the further pulling the expansion tool is moved together with the drilling tool upwards.

The suspension preferably contains water and a hydraulic binder such as concrete or cement. By curing of the binder, the bored pile is formed with a lower column part with diameter D2 and an upper column part with diameter D1 and length L1, which corresponds to the depth of immersion T1.

The solution of the above object is further in a device for producing pile heads in the ground, comprising: a drilling tool with a tubular body and a drill bit, wherein the drilling tool has a closable outlet opening at the lower end, a first rotary drive for rotating Driving the drilling tool; an expansion tool having a tubular body, wherein the drilling tool is longitudinally displaceably guided in the tubular body of the expansion tool, a second rotary drive for rotationally driving the expansion tool; wherein the drilling tool and the extension tool are independently rotatably driven.

With the inventive device with an expansion tool and a recorded in this and independently drivable by this drilling tool, the advantages mentioned in connection with the proposed method, to which reference is made. The device advantageously allows efficient production of soil columns with extended column heads in one operation, without retooling.

According to a preferred embodiment, the expansion tool is coupled via connecting means with the drilling tool. The connecting means may comprise a chain which is attached at least indirectly with the extension tool with a first end and at least indirectly with the drilling tool with a second end. With the phrase "at least indirectly" should be included as a possibility that the chain is directly or indirectly connected to the extension tool or the drilling tool, for example with the respective rotary drive or with a carriage on which the rotary drive for each tool on the mast is held. The coupling of the two tools allows during the drawing in an advantageous manner that the drilling tool entrains the expansion tool when reaching the depth T1. Furthermore, when lowering a further lowering of the drilling tool relative to the expansion tool from reaching the depth T1 is possible.

The expansion tool is preferably designed in the form of a worm boring machine. When screwing the auger boring machine into the ground, the auger fills with cuttings, which is then excavated while pulling. In this way creates a cavity whose diameter is the outer diameter of the auger. The auger is externally mounted on the tubular body of the tool. The tubular body is penetrated by the drilling tool. The proportions of the two tools are coordinated so that the drilling tool can be passed through the tubular body of the expansion tool with radial clearance. It is advantageous if the ratio between the largest outer diameter of the drilling tool to the inner diameter of the tubular body of the expansion tool is greater than 0.9. In this way, only a slight radial clearance between the inner tube extension tool and outer surfaces of the drilling tool is given, whereby a good guidance of the drilling tool is effected. The extension tubular body may have, for example, an inner diameter of 300 mm to 500 mm, in particular of about 400 mm. A largest outer diameter of the auger may for example be between 500 mm and 900 mm. The greater the difference between the inner diameter of the pipe and the outer diameter of the auger, the greater the ratio of the head diameter to the diameter of the column shaft of the ground pile to be produced.

The drilling tool is preferably designed in the form of a Verdrängerdrehbohrgeräts, with which the upcoming soil is displaced during drilling. By displacing the soil a particularly good connection between the upcoming soil and the column body is achieved. The drilling tool has at its end a drill bit and an outlet opening which can be selectively opened or closed by means of a controllable closure part. Upon reaching the desired final depth, the outlet opening is opened and binder suspension filled in the cavity formed while the drilling tool is pulled upwards. The drilling tool preferably has a first helical gear and a second helical gear opposite thereto above the drill bit. A largest outer diameter of the drilling tool can be between 300 mm to 500 mm and in particular be about 380 mm.

Figur 1

ein Bohrgerät mit einer erfindungsgemäßen Vorrichtung zur Herstellung von Bodenpfählen mit einem Bohrwerkzeug und einem Erweiterungswerkzeug im Ausgangsstellung in Seitenansicht;

Figur 2

das Bohrgerät aus Figur 1 in einer Arbeitsstellung mit abgeteuftem Bohrwerkzeug und Erweiterungswerkzeug;

Figur 3

das Bohrwerkzeug aus Figur 1 als Einzelheit;

Figur 4

das Erweiterungsgerät aus Figur 1 als Einzelheit;

Figur 5

ein erfindungsgemäßes Verfahren zur Herstellung von Bodenpfählen zur Baugrundverbesserung, das mittels der erfindungsgemäßen Vorrichtung gemäß den Figuren 1 und 2 durchgeführt wird, schematisch im Längsschnitt durch die Bohrung

1. a) vor dem Abteufen;
2. b) nach dem Abteufen des Bohrwerkzeugs und des Erweiterungswerkzeugs bis zu einer Tiefe T1 ;
3. c) nach dem Abteufen des Bohrwerkzeugs bis zu einer zweiten Tiefe T2;
4. d) während des Ziehens des Bohrwerkzeugs unter gleichzeitigem Ausbringen einer Suspension;
5. e) während des Ziehens des Bohrwerkzeugs bei erneutem Erreichen der Tiefe T1 unter gleichzeitigem Ausbringen von Suspension;
6. f) nach dem vollständigen Ziehen des Bohrwerkzeugs und des Erweiterungswerkzeug bis an die Bodenkante, mit fertiggestelltem Bodenpfahl;

Preferred embodiments of the invention are explained below with reference to the drawing figures. Hereby shows:

FIG. 1

a drill with a device according to the invention for the production of soil piles with a drilling tool and an expansion tool in the starting position in side view;

FIG. 2

the drill off FIG. 1 in a working position with drilled drilling tool and extension tool;

FIG. 3

the drilling tool off FIG. 1 as a detail;

FIG. 4

the expansion unit off FIG. 1 as a detail;

FIG. 5

an inventive method for the production of soil piles for ground improvement, by means of the device according to the invention according to the Figures 1 and 2 is performed, schematically in longitudinal section through the bore

1. a) before sinking;
2. b) after drilling the drilling tool and the extension tool to a depth T1;
3. c) after drilling the drilling tool down to a second depth T2;
4. d) while pulling the drilling tool while simultaneously applying a suspension;
5. e) during the drawing of the drilling tool when the depth T1 is reached again while simultaneously applying suspension;
6. f) after complete removal of the drilling tool and the extension tool to the bottom edge, with completed ground pile;

The FIGS. 1 to 5 will be described together below. It is shown a drill 2 with a device 11 according to the invention for producing pile heads in the ground. The drill 2 is on a bottom surface 3 and is in the Figures 1 and 2 Side view shown. On the drill 2, a Mäklermast 4 is fixed, which has a movable support device 5, on which a drill string 6 are fixed with a drilling tool 7. On the Mäklermast 4 an extension tool 9 is further attached, which is guided along the Mäklermasts 4 longitudinally displaceable.

The drilling tool 7 has a tubular body 15 and a drill bit 16. At a lower end of the drilling tool 7, a closable outlet opening 17 is provided, which can optionally be opened or closed with a controllable closure member 18 for dispensing suspension. The drilling tool 7 is connected via the support device 5 with the Mäklermast 4 and relative to this movable in the longitudinal direction. In this respect, the support device may also be referred to as a carriage. For moving the carriage 5 along the mast 4, a longitudinal drive can be provided. By lowering or raising the carriage 5, the drilling tool can be sunk into the ground and pulled back with the application of suspension to produce a ground pile.

At the upper end of the drilling tool 7, a rotary drive 14 and a flushing head 19 are provided, which can both be moved vertically at the broker 4. For this purpose, the rotary drive 14 and the flushing head 19 are attached to the support device 5. The rotary drive 14 is used for the rotary drive of the drill pipe 7, wherein it is provided that the drill pipe 7 can be driven independently of the extension tool 9. The flushing head 19, which is also referred to as a swivel, serves to connect lines 20 for introducing a settable suspension, wherein only a portion of the lines is shown.

The drilling tool 7 is designed in the form of a Verdrängerdrehbohrgeräts, with which the pending soil is displaced during drilling. Upon reaching the desired final depth, the outlet opening 17 is opened and it is, while the drilling tool 7 is pulled back up, filled binder suspension in the cavity formed by the tool by displacement. Above the drill bit 16, the drilling tool has a lower first worm gear 24 and an upper worm gear 25 opposite thereto. A largest outer diameter of the drilling tool 7 may be, for example, about 380 mm. The inner tubular body 15 has a smaller inner diameter, which is about 300 may be mm.

The drilling tool 7 is in FIG. 3 shown in overall view. He is the tubular body 15 with the first screw 24, the adjoining above the opposite worm gear 25 and the drill bit 16 recognizable. At the lower end of a further screw 22 is provided, which is bolted to the first flight 24. As further details struts 12 and the outlet opening 17 are shown here. The drilling tool 7 is attached with its upper end to the drill pipe 6, which is guided on the broker 4. The borehole is created by screwing or shaking in a pure displacement process.

On the Mäklermast 4 a support device 8 for supporting an extension tool 9 is also provided. The support device 8 for the extension tool 9 is held longitudinally displaceable on Mäklermast, wherein a drive for advancing the support device 8 is not provided, but could theoretically be provided. The expansion tool 9 is arranged coaxially to the drilling tool 7 and has a tubular body 26 through which the drilling tool 7 is passed, and a externally attached to the tubular body 26 Bohrschnecke 27. For the rotary drive of the expansion tool 9, a separate rotary drive 23 is provided as Through boring or designed as a hydraulically driven screw cleaner can be. With the rotary drive 23, the extension tool 9 is rotatably driven about the axis of rotation A9 to be introduced into the ground. By means of the separate rotary drives 14, 23, the two tools 7, 9 can be driven independently of one another and sink into the ground, specifically to individually adjustable depths T1, T2. The drilling tool 7 and the extension tool 9 are parts of the device 11 according to the invention for the production of soil piles in the ground.

The extension tool 9 is designed in the form of a worm boring device, which is shown as a detail in FIG. 4 is shown. In this case, the tubular body 26 with the auger 27 attached thereto on the outside and a drill bit 13 can be seen. When screwing the auger drilling device 9 in the ground by the rotary drive 23rd fills the auger 27 with cuttings, which is then excavated when re-pulling the tool. In this way, a cavity whose diameter D1 the outer diameter of the auger 27 is formed.

The proportions of the two tools 7, 9 are coordinated so that the drilling tool 7 can be passed through the tubular body 27 of the expansion tool 9 with radial clearance. In this case, the ratio between the largest outer diameter D7 of the drilling tool 7 to the inner diameter D9 of the tubular body 27 may be greater than 0.9 in order to obtain the smallest possible annular gap between said tools. The tubular body 27 of the expansion tool 9 may for example have an inner diameter D26 of 300 mm to 500 mm, in particular of about 400 mm. A largest outer diameter D27 of the auger 27 may for example be between 500 mm and 900 mm and in particular is about 700 mm.

For lengthwise coupling of the two tools 7, 9 connecting means 28 are provided, which may be designed in particular in the form of a chain, one end of which are connected to the drilling tool 7 and the other end to the extension tool 9. Specifically, the chain 28 may be attached with its lower end to the rotary drive 23 for the extension tool 9. The upper end of the chain 28 is attached to the carriage 5 to which the drilling tool 7 is attached. By the coupling of the two tools 7, 9 is achieved that the drilling tool 6 when pulling on reaching the depth of the extension tool 9 latter entrains, and both tools 7, 9 pulled together the last section of the bottom 3.

To sink a borehole into a ground, the turret 14 with the drill pipe 6 and the boring tool 7 are lowered, as well as the second turret 23 with the extension tool 9. The first turret 14 for the boring tool 7 is linearly driven by rotational movement, while the second Turret 23 is driven only rotating. The linear lowering movement takes place in the expansion tool solely on the basis of its own weight in combination with the rotational movement. FIG. 1 shows the device 11 according to the invention with the two Tools 7, 9 in the initial state before producing a bored pile, the lower ends of the tools 7, 9 hang on the bottom edge. FIG. 2 shows the device 11 in the sunken state, wherein the extension tool 9 has reached the desired end depth T1, and the drilling tool 7 has been sunk down to the underlying second depth T2 beyond.

In the following, the method according to the invention will be explained in more detail with reference to the drawing figures 5a to 5f. FIG. 5a shows the drill 2 according to FIG. 1 in a slightly simplified representation, with the two tools 7, 9 sit on the ground level. The expansion tool 9 is positioned by means of the steel chain 28 about 20 cm above the leading drill bit 16, so that the suspension exit point is approximately flush with the cutting edge 13 of the expansion tool 9.

FIG. 5b shows the method after performing the first step, namely after the sinking of the two tools 7, 9 to the depth T1. For drilling, the drilling tool 7 and the extension tool 9 lying on the outside thereof are sunk around their respective axis A7, A9 while rotating the drive. The feed is effected by the main auger drive 14, while the augmentation tool 9, hanging from the chain 28, drills by gravity into the bottom 3. If the depth T1 provided for the extended pile head is reached, the lowering of the extension tool 9 is stopped, which is done by switching off the secondary rotary drive 23. This position is in FIG. 5b shown. The drilling tool 7 and the extension tool 9 are preferably lowered together, in particular at the same speed, which may for example be 15 to 30, in particular 20 to 25 revolutions per minute, and rotating drive in the same direction of rotation. This achieves fast and efficient process management; However, it is also conceivable in principle that the tools are sunk with a time lag.

In the following next step, the drilling tool 7 is further sunk into the ground, up to the intended final depth T2, which later marks the lower end of the ground pile to be produced. During the sinking the pending soil is displaced by the drilling tool 7 radially outward. FIG. 5c The lowering takes place by the provided for the drilling tool 7 rotary head 14 and the corresponding linear drive for the carriage 5. During the Abteufvorgangs the drilling tool 7 is the extension tool 9 still and initially remains unchanged in the depth T1.

After the drilling tool 9 has reached the desired final depth T2 and the bore 21 has been sunk to the lowest layer of soil 28, the concreting process begins. For this purpose, the outlet opening 17 of the drilling tool 9 is opened, so that while the drilling tool 9 is pulled back, binder suspension can be introduced into the cavity formed by displacing the soil. This third process step is in FIG. 5d shown, wherein the emerging from the drilling tool 7 suspension is recognizable. The suspension contains water and a hydraulic binder such as concrete or cement. The pulling takes place at defined parameters such as hydraulic pressure and speed. By setting the binder results in a solid base pile 29, which can also be referred to as a column body or, in displacement of the soil by the drilling tool, as a displacement drill column. The process is carried out from bottom to top, first from the depth T2 to the depth T1. The renewed reaching of the depth T1 is in FIG. 5e shown.

Upon reaching the depth T1, the lengthwise coupling between the drilling tool 7 and the extension tool 9 is effective, so that the drilling tool 7 entrains the extension tool 9 and both tools together the last portion T1 are pulled out of the bottom 3. The lengthwise coupling of the two tools 7, 9 is effected by the chain 24, with which the desired distance of the two tools 7, 9 has been set to each other before the sinking. The common drawing of the two tools 7, 9 is still carried out with application of binder suspension, so that now the pile head is made with a large diameter.

Because the expansion tool 9 has a larger largest outer diameter D9 than the drilling tool 7 (largest outer diameter D7), a column body is formed with an upper first section 30 having a correspondingly larger first diameter D1 and a lower second section 31 having a correspondingly smaller diameter D2. In this case, the length of the extended pile head 30 corresponds to the depth T1, to which the expansion tool 9 has been lowered, while the length of the lower column part corresponds to the difference of the depths T2 and T1. The finished floor post 29 is in FIG. 5f shown.

Overall, the device according to the invention or the method according to the invention offers the advantage that ground piles 29 with extended pile heads 30 can be produced quickly and easily in one operation. In this case, both tools 7, 9 can be driven individually rotating, so that they can be sunk to individual depths T1, T2. In this way, the length of the extended pile head can be adapted to the static needs.

LIST OF REFERENCE NUMBERS

2

drill

3

ground

4

broker

5

carrying device

6

drill pipe

7

drilling

8th

carrying device

9

Enhancements tool

11

contraption

12

strut

13

drill bit

14

Turret (drilling tool)

15

Tubular body (drilling tool)

16

drill bit

17

outlet opening

18

closing part

19

Swivel / Swivel

20

management

21

drilling

22

snail's pace

23

Turret (extension tool)

24

snail's pace

25

snail's pace

26

Tubular body (extension tool)

27

auger

28

connecting means

29

Bohrpfahl

30

first section

31

second part

A

axis of rotation

D

diameter

T

depth

Claims (15)

1. Method for producing ground piles with expanded pile heads by means of a device (11), which has a drilling tool (7) with a first outer diameter (D7) and a first rotary drive (14), as well as an expanding tool (9) with a second outer diameter (D9) and a second rotary drive (23), wherein the first outer diameter (D7) is smaller than the second outer diameter (D9), and wherein the drilling tool (7) is guided in a longitudinally movable manner in a tubular body (26) of the expanding tool (9), comprising the method steps:

   sinking the expanding tool (9) under rotating drive down to a first depth (T1);

   sinking the drilling tool (7) under rotating drive down to a second depth (T2), which is below the first depth (T1), wherein the rotational velocity of the expanding tool (9) is reduced during sinking the drilling tool (7) from the first depth (T1) to the second depth (T2);

   pulling the drilling tool (7) and the expanding tool (9) out of the ground (3) while injecting a suspension, wherein the suspension fills a hollow space, formed by the drilling tool (7) and the expanding tool (9).
2. Method according to claim 1,
   characterised in
   that the first and the second rotary drive (14, 23) are rotatingly driveable independently from each other.
3. Method according to claim 1 or 2,
   characterised in
   that the expanding tool (9) is sunk without feed drive, only by means of rotational driving of the second rotary drive (23), wherein the rotational speed of the second rotary drive (23) is reduced to zero when reaching the first depth (T1).
4. Method according to one of claims 1 to 3,
   characterised in
   that the drilling tool (7) and the expanding tool (9) are sunk together down to the first depth (T1).
5. Method according to one of claims 1 to 4,
   characterised in
   that the drilling tool (7) and the expanding tool (9) are driven in the same rotational direction.
6. Method according to one of claims 1 to 5,
   characterised in
   that the drilling tool (7) and the expanding tool (9) are driven together down to the first depth (T1) respectively with a rotational speed of 15 to 30 rotations per minute.
7. Method according to one of claims 1 to 6,
   characterised in
   that the expanding tool (9) remains in the sunk position when the drilling tool (7) is pulled from the second depth (T2) up to the first depth (T1) and, when the drilling tool (7) has again reached the first depth (T1), it is pulled upwards together therewith.
8. Method according to one of claims 1 to 7,
   characterised in
   that the expanding tool (9) is coupled to the drilling tool (7) such, that when being pulled from the depth (T2) upwards the drilling tool (7) picks up the expanding tool (9) when it again reaches the depth (T1) and that both tools are pulled together out of the ground.
9. Method according to one of claims 1 to 8,
   characterised in
   that the suspension contains water and a hydraulic binding agent like concrete or cement, wherein an augered pile is produced upon hardening of the binding agent.
10. Device for producing pile heads in the ground, comprising:

    a drilling tool (7) with a tubular body (15) and a drilling crown (16), wherein the drilling tool has a closable outlet opening (17) at the lower end,

    a first rotary drive (14) for rotationally driving the drilling tool (7),

    an expanding tool (9) with a tubular body (26), wherein the drilling tool (7) is guided in a longitudinally displaceable manner in the tubular body (26) of the expanding tool (9),

    a second rotary drive (23) for rotatingly driving the expanding tool (9),

    wherein the drilling tool (7) and the expanding tool (9) are rotatingly driveable in an independent manner from each other.
11. Device according to claim 10,
    characterised in
    that the expanding tool (9) is coupled via connection means (28) to the drilling tool (7).
12. Device according to one of claims 10 or 11,
    characterised in
    that the connection means (28) comprise a chain, which is attached with a first end at least indirectly to the expanding tool (9) and with a second end at least indirectly to the drilling tool (7).
13. Device according to one of claims 10 to 12,
    characterised in
    that the expanding tool (9) is configured in the form of an auger drilling device comprising a drilling auger (27), which is filled with drilling debris when being sunk.
14. Device according to one of claims 10 to 13,
    characterised in
    that the drilling tool (7) is configured in the form of a displacement rotary drilling device, with which the existing ground (3) is displaced during sinking.
15. Device according to one of claims 10 to 14,
    characterised in
    that the expanding tool (9) has an outer diameter (D9) of 500 mm to 900 mm and/or
    that the tubular body (26) of the expanding tool (9) has an inner diameter (D26) of 300 mm to 500 mm, wherein a largest outer diameter (D7) of the drilling tool (7) is designed such, that the drilling tool (7) can be guided through the tubular body (26) of the expanding tool (9) with a radial play.

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