EP1300546A1 - Injection drilling anchor - Google Patents

Abstract

The injection bore anchor (1) has a steel tube (2) with a smooth outer surface section (6) and a thread (4,5) at one end. The first threaded section has a bore drive (BA) and an exchangeable adaptor (65) to feed an injection medium (M) and the other threaded section (5) with an outlet bore (30) for the injection medium and a flushing medium. There is a cross bore (7) in the middle of the tube, with an inflatable hose (12).

Description

The invention relates to an injection drill anchor made of at least one steel tube.

Injection drill anchors are used in a wide variety of designs Connecting used rock layers used in particular in underground mining, but also routes and tunnels Keep cavities open.

Examples of such injection drilling anchors are disclosed in DE-PS 936 082, which DE 31 45 923 A1 and DE 34 00 182 C2.

In order to be able to bring such injection drilling anchors into the mountains drill holes are first made with the help of drill rods, into which after after removing the drill pipe, the injection drill anchors are then inserted and are fixed in the boreholes using injection media. To the The ends protruding from the drill holes are anchor plates for the injection drill anchors assigned with which they are supported on the mountains.

Practice has shown that it is common after drilling a well it is no longer possible to remove the drill string from the borehole in order to then insert an injection drill anchor. This is a little stable mountains because there after removing the drill pipe the borehole collapses and thus for the insertion of an injection drill anchor becomes unusable.

WO 91/15657 discloses an injection drill anchor with an anchor tube, a drill bit at the anchor tip facing the deepest hole and Has flushing and injection openings. The anchor tube is with a borehole closure and at the end protruding from the borehole with a detachable connection element. To use such an anchor tube as part of a drill pipe and at the same time as an anchor is the as Section formed drill, with a trained as a drilling adapter Connection element is provided against a section designed as an anchor tube interchangeable, the section with a borehole closure and a check valve is provided.

To the formation of a post-injection using one with several Injection drill anchor equipped with injection valves an existing anchoring body more controllable shape, it is proposed in DE 197 02 749 A1, each injection valve to be individually charged with the pressing medium so that the Pressing process in accordance with the local conditions of the borehole wall adapted manner can be carried out. Which are the injection valves forming radial expansion of the anchoring body can be made more reproducible in this way.

DE 44 45 626 A1 makes the proposal to include an injection sliding drill anchor an inflatable packer, an inflatable jacket and a stable support tube equip and integrate a valve in the support tube. Via the inflation valve the inflatable packer is fixed, this process only being initiated when the drilling is finished. For this, at the beginning of the Injection process, a valve body is flushed into the inflatable packer, which attaches itself supports a valve seat provided and trained there. The The valve body is replaced by pressure increase after the expansion work destroyed, so that then injection material in the force application area can penetrate. The inflatable packer is equipped with a post-injection valve, which enables re-pressing of the free spin track.

The object of the invention is based on the prior art based on creating an injection drill anchor, which even with one less stable mountains securely and positionally fixed in a borehole can be.

The invention solves this problem by the specified in claim 1 Characteristics.

The core of the invention is the design of an injection drill anchor, which both to create a borehole, to seal the borehole, to insert of an injection medium in the mountains and as a load-bearing element of mountain protection serves.

For this purpose, the injection drill anchor according to the invention comprises at least a steel tube that has a smooth cylindrical surface middle longitudinal section and at the ends of outer threaded sections. Of these threaded sections, there is a first threaded section on the one hand with a drill drive and on the other hand in exchange with the drill drive can be coupled with an injection adapter for supplying an injection medium. The second threaded section at the other end of the steel pipe is used for the coupling with an outlet bore for a drill bit the rod head containing the injection medium. On the one with at least A central hose section provided with a transverse bore is an inflation hose fixed in position.

Due to the mirror image of the vertical central transverse plane The steel pipe can be coupled as required.

The first threaded section is used to insert an injection drill anchor coupled with a drill drive. Through the drill drive is a Borehole made, at the same time a flushing fluid supplied via the drill drive can be. However, the pressure of the flushing fluid must not be so great that the inflation hose is activated.

Once the borehole has been drilled to the required depth, two or if necessary several steel pipes are put together by appropriate coupling sleeves the drill drive is removed from the first thread section. Then a locking ball deformable under pressure with a defined Hardness is inserted into the longitudinal channel of the steel pipe and then the injection adapter coupled to the first threaded section.

Now the injection medium is inserted into the steel pipe via the injection adapter introduced, the locking ball to the mouth of the locking hole in Rod head is shifted in the longitudinal channel. Here the locking ball seals the Exit area of the longitudinal channel into the rod head. The injection medium thereby occurs through the cross hole in the wall of the steel pipe Inflation hose. This inflates and seals depending on pressure and form-fitting against the wall of the borehole. Then the pressure of the injection medium so far increased that the locking ball is deformed by the Locking hole is pressed in the rod head, thereby in the interior in the Rod head arrives and thus the path for the injection medium via the Rod head and the outlet holes provided there in the surrounding Mountains are released. Due to the pressure-dependent sealing of the inflation hose in the Borehole can inject the injection medium into the rock at high pressure become. This makes the injection area in the surrounding mountains essential increased. This option allows the number of to be set Anchors can be significantly reduced.

After the injection is finished, the injection adapter is removed from the first thread section removed and used for further injections.

The invention makes drillable injection drill anchors with injection packers possible consequently, with simple means in a comparatively short time a mountain anchor - even in an unused mountain range - with optimal injection of injection liquids perform.

According to a design suitable for production according to the characteristics of the Claim 2 is the rod head with an internal thread Threaded sleeve screwed onto the second threaded section.

The drill bit is according to claim 3 with an internal thread provided screw sleeve on a connector with an external thread of the rod head. Between the threaded sleeve and the socket of the rod head, the exit bores extending from the interior extend for the injection medium. These are based on the interior preferably arranged slightly inclined towards the steel tube.

According to the features of claim 4, the drill bit with a Longitudinal channel provided. In addition to the rinsing fluid, the injection medium can also pass through this step into the borehole when the locking ball passes over the longitudinal channel has been pressed into the drill hole in the drill bit. Is accordingly the diameter in the longitudinal channel of the drill bit in relation to the diameter the locking ball designed.

So that the drilling cuttings that occur during the production of the borehole are perfect circumferential side of the steel pipe can be discharged according to the Feature of claim 5 on the end facing the drill bit of the inflation hose fixed at the end with press sleeves on the steel tube one towards the drill bit down to the outer surface of the steel pipe tapered deflector sleeve attached. A jam in the transport of the Drilling cuttings are avoided. The wall thickness of the deflector sleeve corresponds preferably the wall thickness of the compression sleeves.

An improved transfer of the injection medium from the longitudinal channel in the steel tube in the circumferential side of the smooth cylindrical length section fixed inflation hose serve the features of claim 6.

The openings of the cross holes in the outer surface of the steel tube are according to claim 7 by a tightly enclosing the steel tube elastic sleeve covered. The elasticity of the sleeve is designed so that it only yields at a certain internal pressure in the longitudinal channel of the steel pipe and the injection medium into the inflation hose for pressing the borehole wall releases. The sleeve can for example consist of a Hose section to be formed.

To secure the position of the elastic sleeve on the steel tube before pressing of the inflation hose are fixed on the end of the sleeve on the steel tube Fixing rings provided (claim 8).

The drill drive shows - at least indirectly - according to the characteristics of claim 9 a rotating union for a flushing fluid, such as Water, and a pipe coupling connected to the rotating union. The Pipe coupling comprises two limited in an annular coupling jacket rotatable and radially displaceable against an elastic restoring force Clamping jaws with inner thread segments adapted to the first thread section and locking balls mounted in circumferential recesses. In the cylindrical inner surface of the clutch jacket are diametrically opposed to each other opposite locking recesses in a circumferential direction intended. The areas of these recesses extend from one radial shoulder first in the circumferential direction and then slightly increasing until they pass into the inner surface.

If the drill drive is activated, the locking balls are caused by the curve of the recesses pressed radially inwards so that they can then on the Roll along the inner surface of the coupling jacket. Here embrace the Clamping jaws with the inner thread segments make up the first thread section and if the drilling drive continues to activate, turn it Steel pipe with the drill bit at the end.

Once the desired depth of the borehole has been reached, the drill drive is stopped and turned the pipe coupling back 90 ° until the locking balls under the influence of the elastic restoring force in the recesses arrive and the thread segments detach from the first thread section. The drill drive is no longer connected to the injection drill anchor. Then the rotary union with the pipe coupling from the first thread section are removed.

A particularly advantageous embodiment of the invention is according to claim 10 seen in that the elastic restoring force for between segment-like, supported on the inner surface of the coupling jacket Sliding bodies radially positively guided jaws by next to the Threaded segments arranged helical compression springs is formed. The ends the helical compression springs are preferably in the pockets of the clamping jaws.

Finally, it is also advantageous according to the invention if according to the patent claim 11 of a screw sleeve for connection to the first threaded section having injection adapters one behind the other Includes hose connector, a mixer and a check valve. The Hose connection is used to connect to an injection line. Here is preferably a quick snap lock is provided. The mixer serves the production of a correct consistency of the injection medium, while the check valve reflows the injection medium Filling the gap between the borehole wall and the injection drill anchor prevented.

Figur 1

im vertikalen Längsschnitt einen an einen Bohrantrieb gekuppelten Injektionsbohranker;

Figur 2

im vertikalen Längsschnitt den Injektionsbohranker der Figur 1, angekuppelt an einen Injektionsadapter;

Figur 3

in vergrößertem Maßstab im Längsschnitt ein Stahlrohr des Injektionsbohrankers der Figuren 1 und 2 mit einem Blähschlauch in der Bohrposition;

Figur 4

in nochmals vergrößertem Maßstab den mittleren Längenabschnitt des Stahlrohrs der Figur 3 während der Verspannung des Injektionsbohrankers in einem Bohrloch;

Figur 5

in vergrößertem Maßstab im vertikalen Längsschnitt eine Drehdurchführung eines Bohrantriebs zusammen mit einer Rohrkupplung;

Figur 6

einen vertikalen Querschnitt durch die Darstellung der Figur 5 entlang der Linie VI-VI in Richtung der Pfeile Vla gesehen in der entkuppelten Position;

Figur 7

die Darstellung der Figur 6 in der gekuppelten Position;

Figur 8

in vergrößertem Maßstab im vertikalen Längsschnitt den Injektionsadapter der Figur 2 und

Figur 9

in vergrößertem Maßstab im vertikalen Längsschnitt den Ausschnitt IX der Figur 2.

The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the drawings. Show it:

Figure 1

in vertical longitudinal section an injection drill anchor coupled to a drill drive;

Figure 2

in vertical longitudinal section the injection drill anchor of Figure 1, coupled to an injection adapter;

Figure 3

on an enlarged scale in longitudinal section a steel tube of the injection drill anchor of Figures 1 and 2 with an inflation hose in the drilling position;

Figure 4

on a further enlarged scale the middle length section of the steel tube of Figure 3 during the bracing of the injection drill anchor in a borehole;

Figure 5

on an enlarged scale in vertical longitudinal section, a rotary joint of a drill drive together with a pipe coupling;

Figure 6

a vertical cross section through the representation of Figure 5 along the line VI-VI seen in the direction of arrows Vla in the uncoupled position;

Figure 7

the representation of Figure 6 in the coupled position;

Figure 8

on an enlarged scale in vertical longitudinal section the injection adapter of Figure 2 and

Figure 9

section IX of FIG. 2 on an enlarged scale in a vertical longitudinal section.

1 in FIGS. 1 and 2 is an injection drill anchor for strengthening a used mountain range.

The injection drill anchor 1 includes (see also FIG. 3) a steel pipe 2 a longitudinal channel 3. The ends of the steel tube 2 have outer threaded sections 4, 5 on. A smooth extends between the threaded sections 4, 5 cylindrical middle section 6. In this section 6 there are four offset from each other by 90 ° on the circumference and in pairs in diametrical Arrangement in two parallel transverse planes Q1, Q2 provided cross holes 7 arranged in the wall 8 of the steel tube 2. The mouths of the Cross bores 7 in the outer surface 9 of the steel tube 2 are through a the steel tube 2 tightly enclosing elastic sleeve 10, e.g. in form of Hose section, covered. The axial position of the elastic sleeve 10 the steel tube 2 is through two ends of the sleeve 10 on the steel tube 2nd fixed fixing rings 11 secured.

The cross bores 7, the sleeve 10 and the fixing rings 11 are one Inflatable hose 12 covered. The inflation hose 12 is in the vicinity of its end faces 13 fixed in position on the steel tube 2 by pressing sleeves 14.

On one of the drill bits 15 of the injection drill anchor 1 (FIGS. 1, 2 and 9) facing end of inflatable tube 12 is one in the direction of the drill bit 15 tapering to the outer surface 9 of the steel tube 2 Deflector sleeve 16 attached. The wall thickness of the deflector sleeve 16 corresponds to approximately the wall thickness of the compression sleeves 14.

As when viewing Figures 1, 2 and 9 together, but in particular 9, can be seen, the drill bit 15 has a screw sleeve 17 an internal thread 18 with which it fits onto an external thread 19 having nozzle 20 of a rod head 21 is set, which in turn with a threaded sleeve 23 having an internal thread 22 on the second Threaded section 5 of the steel tube 2 is screwed. The drill bit 15 is with provided a central longitudinal channel 24.

The rod head 21 extends from the bottom 25 of the threaded sleeve 23 a locking bore 26 with a sealing seat 27, which the longitudinal channel 3 in Steel tube 2 is facing. The locking bore 26 opens out via a conical Length section 28 in an interior space 29 which is larger in diameter than that Locking hole 26 and also larger than the longitudinal channel 24 in the drill bit 15 is measured. A plurality of outlet bores 30 extend from the interior 29 , which open into the peripheral surface 31 of the rod head 21. The exit bores 30 are inclined away from the drill bit 15.

The injection drill anchor 1 described above is used to manufacture a Borehole in the mountains with a rotary feedthrough 32 as part of a not Drill drive BA illustrated in more detail and with one with the rotating union 32 connected pipe coupling 33 connected (Figures 1 and 5 to 7).

The rotating union 32 comprises an annular housing 34 with a connection 35 for a flushing fluid SF, e.g. Water (Figure 5). From one with that Connection 35 connected ring channel 41 in the housing 34 cross holes 36 to a central blind bore 37 in the with the drill drive BA detachable rotor 38 of the rotary union 32. The areas next to the mouths of the cross bores 36 in the outer surface 39 of the rotor 38 sealed by sealing rings 40 chambered in the housing 34. The axial Relative position of the housing 34 and the rotor 38 is by a radial flange 42 guaranteed on the rotor 38 and by a locking ring 43.

With the rotor 38 is an annular coupling jacket 44 of the pipe coupling 33 firmly connected. A limiting disk extends on the front side of the coupling jacket 44 45 and a fixing ring 46.

As can be seen particularly in FIGS. 5 to 7, between the Rotor 38 and the limiting disk 45 within the clutch jacket 44 two jaws 47 radially displaceable. The jaws 47 are between two are supported on the inner surface 48 of the coupling jacket 44 guided segment-like sliding bodies 49.

On the inside, the clamping jaws 47 are adapted to the first threaded section 4 Thread segments 50 on. Between the thread segments 50 and there are pocket-like recesses 51 in the sliding bodies 49 (FIG. 6) the helical compression springs 52 are inserted. The helical compression springs 52 try to move the jaws 47 radially outwards.

In the circumferential recesses 53 of the jaws 47 are in two juxtaposed transverse planes locking balls 54 that extend over the circumference 55 of the jaws 47 protrude.

In the predominantly cylindrical inner surface 48 of the coupling jacket 44 recesses 56 are incorporated in a diametrical offset. The Locking recesses 56 extend from a radial shoulder 57 a peripheral surface 58 and an adjoining inclined surface Transition surface 59 into the inner surface 48 of the coupling jacket 44th

In the decoupled position shown in Figure 6, the injection drill anchor can 1 of Figures 1 and 2 with its first threaded section 4 between through the threaded segments 50 up to the stop on a sealing ring 60 are pushed in the rotor 38 (FIG. 5). Then the drill drive BA activated, the rotor 38 rotates and thus also the clutch casing 44 the pipe coupling 33 according to arrow 62 in Figures 6 and 7, so that the Locking balls 54 are taken along and the curve shape of the locking recesses 56 are pressed radially inwards. This will also Jaws 47 shifted inward with the result that the thread segments 50 the first threaded section 4 of the injection drill anchor 1 form and grip non-positively (Figure 7).

As the drill drive BA continues to rotate, the rock bolt 1 becomes consequently rotated so that a borehole can be created.

When drilling, the connection 35 of the rotary union 32 and the rotating union 32 and the longitudinal channel 3 in the steel tube 2 Flushing fluid SF is fed to the rod head 21, where the flushing fluid SF via the outlet bores 30 in the rod head 21 and over the longitudinal channel 24 in the Drill bit 15 can emerge (arrows 61 in Figure 1). The resulting cuttings gets in between the borehole wall and the injection drill anchor 1 Direction to the mouth of the borehole. Care is taken here that the Pressure of the flushing fluid SF is insufficient, the elastic sleeve 10 from the mouths the cross holes 7 within the inflatable tube 12.

Once the borehole has been drilled to the required depth, the pipe coupling 33 so shifted in the direction of arrow 63 of Figure 7 that the locking balls 54 after the reaching of the recesses 56 due to the restoring force of the Helical compression springs 52 are shifted into the recesses 56, so that the threaded segments 50 of the jaws 47 are from the first threaded section 4 solve. The rotary union 32 and the pipe coupling 33 can then be withdrawn from the first threaded section 4.

Subsequently, a flexible locking ball 64 with a defined hardness in the Longitudinal channel 3 of the steel tube 2 introduced (Figure 2). The diameter of the Locking ball 64 is smaller than the diameter of the longitudinal channel 3, however larger than the diameter of the locking bore 26 in the rod head 21.

After the insertion of the locking ball 64 into the longitudinal channel 3, one of the Figures 2 and 8 recognizable injection adapter 65 with a screw sleeve 66 turned on the first threaded section 4 of the steel tube 2 until its end face comes to rest on a seal 67 inside the screw sleeve 66. To make it easier to turn the injection adapter 65, the screw sleeve 66 two diametrically protruding hand levers 68 welded.

The injection adapter 65 also has a screw sleeve in the longitudinal direction 66 welded pipe section 69 a hose connection 70, a Mixer 71 and a check valve 72.

After coupling an injection line to the hose connection 70 the injection medium IM abandoned (Figures 2 and 3). The injection medium IM flows through the mixer 71 and the check valve 72 and enters the longitudinal channel 3 of the steel tube 2, where there is the locking ball 64 to the system shifted the sealing seat 27 of the locking bore 26 (Figures 2 and 9).

The injection medium IM can therefore not through the rod head 21 in the Emerge from the borehole. Rather, the injection medium IM is under pressure via the transverse bores 7 with expansion of the elastic sleeve 10 (FIG 4) enter the inflation hose 12 and its middle, between the Press the compression sleeve 14 located area 73 against the borehole wall. The injection pressure then deforms by further increasing the injection pressure Lock ball 64 to an oval locking body (dash-dotted lines in Figure 9) and enters through the locking bore 26 into the interior 29 of the rod head 21 a. The injection medium IM can now come from the interior 29 step into the borehole via the outlet bores 30. A transition too Via the longitudinal channel 24 in the drill bit 15 is optionally possible.

If the borehole is properly filled with the injection medium IM, a Back flow of the injection medium IM from the longitudinal channel 3 in the steel tube 2 prevented by the check valve 72 in the injection adapter 65.

The injection medium IM is stopped. After curing the Injection medium IM can the injection adapter 65 after removal of the injection line from the hose connection 70 from the first threaded section 4 be turned off.

REFERENCE NUMBERS

1 -

Anchors

2 -

Steel tube v. 1

3 -

Longitudinal channel in 2nd

4 -

first thread section

5 -

second thread section

6 -

middle section of v. 2

7 -

Cross holes in 8

8th -

Wall v. 2

9 -

outer surface v. 2

10 -

elastic sleeve

11 -

Fixing rings f. 10

12 -

inflating tube

13 -

End faces v. 12

14 -

Press sleeves f. 12

15 -

Drill bit v. 1

16 -

Abweiserhülse

17 -

Screw sleeve v. 15

18 -

Internal thread v. 17

19 -

External thread v. 20

20 -

Neck v. 21

21 -

rod End

22 -

Internal thread v. 23

23 -

Threaded sleeve v. 21

24 -

Longitudinal channel in 15

25 -

Floor v. 23

26 -

Locking hole in 21

27 -

Sealing seat on 26

28 -

conical length section in 21

29 -

Interior v. 21

30 -

Outlet holes in 21

31 -

Surface v. 21

32 -

Rotary union

33 -

pipe coupling

34 -

Housing v. 32

35 -

Connection to 34 f. SF

36 -

Cross holes in 38

37 -

Blind hole in 38

38 -

Rotor v. 32

39 -

outer surface v. 38

40 -

Sealing rings in 34

41 -

Ring channel in 34

42 -

Radial flange v. 38

43 -

Circlip on 38

44 -

Clutch jacket v. 33

45 -

Limiting disc v. 33

46 -

Fixing ring v. 33

47 -

Jaws v. 33

48 -

inner surface v. 44

49 -

Sliding body v. 33

50 -

Thread segments v. 47

51 -

pocket-like recesses in 47

52 -

Helical compression springs

53 -

Deepening in 47

54 -

Locking balls in 53

55 -

Scope of 47

56 -

Locking recesses in 48

57 -

radial paragraph v. 56

58 -

Area of 56

59 -

Transition area v. 56

60 -

Sealing ring in 38

61 -

arrows

62 -

arrow

63 -

arrow

64 -

Locking ball in 3rd

65 -

injection adapter

66 -

Screw sleeve v. 65

67 -

Seal in 66

68 -

Hand lever v. 65

69 -

Pipe section v. 65

70 -

Hose connection v. 65

71 -

Mixer v. 65

72 -

Check valve v. 65

73 -

Area v. 12

BA -

drill drive

IN THE -

injection medium

Q1 -

transverse plane

Q2 -

transverse plane

SF -

flushing fluid

Claims (11)

Injection drill anchor (1) made from at least one steel tube (2) attached to one the outer surface (9) smooth cylindrical middle length section (6) and at the end outer thread sections (4, 5), one of which first threaded section (4) on the one hand with a drill drive (BA) and on the other hand, in exchange for an injection adapter (65) for delivery one injection medium (IM) and the other second threaded section (5) with an outlet holes (30) for the injection medium (IM) and a Rod head having flushing fluid (SF) and carrying a drill bit (15) (21) can be coupled, the circumferential side having at least one transverse bore (7) provided middle length section (6) an inflation hose (12) fixed in position and one with pressure when the drilling drive (BA) is uncoupled deformable locking ball (64) can be inserted into the longitudinal channel (3) of the steel tube (2) is whose diameter is smaller than the diameter of the longitudinal channel (3), but larger than the diameter of one in the rod head (21) Transition from the longitudinal channel (3) to one with a larger diameter Interior (29) in the rod head (21) provided locking bore (26) is. Injection drill anchor according to claim 1, in which the rod head (21) with a threaded sleeve (23) having an internal thread (22) the second threaded section (5) is screwed. Injection drill anchor according to claim 1 or 2, in which the drill bit (15) with a screw sleeve provided with an internal thread (18) (17) on a connector (20) having an external thread (19) the rod head (21) is fixed. Injection drill anchor according to one of claims 1 to 3, in which the drill bit (15) is provided with a longitudinal channel (24). Injection drill anchor according to one of claims 1 to 4, in which on the end of the end facing the drill bit (15) with press sleeves (14) on the steel tube (2) position-fixed inflation hose (12) one in Direction to the drill bit (15) up to the outer surface (9) of the steel pipe (2) tapered deflector sleeve (16) is attached. Injection drill anchor according to one of claims 1 to 5, in which in the middle area of the inflation hose (12) four on the circumference by 90 ° each offset to one another and in pairs in a diametrical arrangement in two parallel transverse planes (Q1, Q2) provided cross holes (7) Penetrate the wall (8) of the steel tube (2). Injection drill anchor according to one of claims 1 to 6, in which the mouths of the transverse bores (7) in the outer surface (9) of the Steel pipe (2) by an elastic surrounding the steel pipe (2) tight Sleeve (10) are covered. Injection drill anchor according to claim 7, in which the axial position the elastic sleeve (10) on the steel tube (2) through two ends of the Sleeve (10) on the steel tube (2) fixed fixing rings (14) is secured. Injection drill anchor according to one of claims 1 to 8, in which the drill drive (BA) has a rotary feedthrough (32) for a flushing fluid (SF) and has a pipe coupling (33) connected to the rotary feedthrough (32), the two in a ring-shaped coupling jacket (44) can be rotated within limits and radially displaceable against an elastic restoring force (52) Clamping jaws (47) matched to the first threaded section (4) inner thread segments (50) and in circumferential recesses (53) stored locking balls (54), which with the in a circumferential direction blocking locking recesses (56), otherwise cylindrical interact inner surface (48) of the coupling jacket (44). Injection drill anchor according to claim 9, in which the elastic Restoring force (52) for between segment-like, on the inner Surface (48) of the coupling jacket (44) supporting sliding bodies (49) radially positively guided clamping jaws (47) by next to the thread segments (50) arranged helical compression springs is formed. Injection drill anchor according to one of claims 1 to 10, in which one screw sleeve (66) for connection to the first threaded section (4) having injection adapters (65) arranged one behind the other a hose connection (70), a mixer (71) and a check valve (72).

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