Reusable injection drill needle with connecting couplings for subsequent sealing of sealing joints

Abstract

Reusable injection drill needle with connecting couplings for subsequent sealing of sealing joints, consisting of a pipe section (1) with a tip (2) and a transverse bore (3) immediately in front of the tip (2), in which a slightly shorter support tube (6) is arranged on a long pipe section (1), wherein the inner diameter of the support tube (6) is insignificantly larger than the outer diameter of the long pipe section (1) and the outer diameter of the support tube (6) is smaller than the joint width, wherein the end opposite the tip (2) terminates in a flat-head nipple (7) with a first spring (4) and a ball (5) and in which the bore edges of the transverse bore (3) are drawn inwards.

Description

[0001] The invention relates to a reusable injection drill needle with connecting couplings for subsequent sealing of sealing joints.

[0002] A method and a device for the subsequent sealing of sealing joints in tunnels, for example with walls made of tubbings or similar wall elements that can be sealed against each other, are known (DE 10 2013 008 448 B4), in which a wall bore is produced up to a joint seal, then an injection pipe is pushed through the wall bore up to the joint seal and an injection needle through the seal and subsequently an injection with a sealing material is carried out from the air side through the injection pipe and the injection needle.

[0003] Also known from catalog number 15 of 2018 from the company "DESOI GmbH", page 103 ff., is an injection drill needle for the subsequent sealing of watertight concrete structures, in particular sealing joints in tunnel lining segments. This needle consists of a short pipe section with a transverse bore near its end and a tip at the end. The other end of the short pipe section is inserted into a retaining adapter up to its inner stop. The retaining adapter is, in turn, inserted up to its outer stop into a valve housing containing a check valve. An external thread is located at the end of the valve housing. An injection tube is screwed onto this external thread to extend the injection drill needle.Since the injection needle can only be short for stability reasons, but the wall to be penetrated is usually considerably thicker, a channel must be drilled into the wall or joint up to the seal itself. This channel must be slightly larger than the diameter of the valve housing or the injection tube. The injection needle and injection tube are inserted into this channel. The end face of the valve housing or the retaining adapter abuts the seal, thus forming a mechanical stop when the injection needle is pressed. The injection needle penetrates the seal, allowing the injection material to flow through the injection tube and behind the seal of the concrete elements on the uphill side. The injection needle typically remains in the seal.

[0004] It has proven disadvantageous that an injection tube must always be used for thicker walls or joints, meaning the injection point has to be drilled out. This necessitates two work steps and requires a significant amount of injection material, as the material contained within the injection tube is lost.

[0005] Ultimately, an injection drill needle consisting of a pipe section with a tip and a transverse bore immediately in front of the tip in a holding adapter with a valve housing is known (DE 20 2019 106 990 U1). In this needle, a slightly shorter support tube is arranged on a longer pipe section, and the inner diameter of the support tube is only slightly larger than the outer diameter of the pipe section, while the outer diameter of the support tube is smaller than the joint width. In practice, it has been shown that with this injection drill needle, the sharp edges of the transverse bore cause material abrasion at the seal, thus damaging the seal to such an extent that it leaks after the injection drill needle is withdrawn. Furthermore, there is no precise means of verifying whether sufficient injection material has been injected into the joint.

[0006] The object of the invention is to create a reusable injection drill needle with connecting couplings for subsequent sealing of sealing joints, in which its transverse bore at the injection drill needle tip has no sharp bore edges and which achieves a controlled, complete injection of the sealing joints.

[0007] According to the invention, the problem is solved by a reusable injection needle with connecting couplings for subsequent sealing of sealing joints, consisting of a pipe section with a tip and a transverse bore immediately in front of the tip, in which a slightly shorter support tube is arranged on a longer pipe section. The inner diameter of the support tube is, in particular only slightly, larger than the outer diameter of the longer pipe section. The outer diameter of the support tube is smaller than the joint width. The end opposite the tip terminates in a flat-head nipple with a first spring and a ball. In the injection needle, the bore edges of the transverse bore are drawn inwards. The longer pipe section can be screwed into the flat-head nipple, but it can also be glued into the flat-head nipple or glued and additionally pressed in place.

[0008] A first connecting coupling on the injection bore needle is a valve opener for opening the injection channel to the gap, consisting of a first coupling with an actuator that is screwed into the first coupling until it reaches a stop. At its insertion end, the actuator has a pin whose outer diameter is slightly smaller than the bore in the flat-head nipple. To open the injection channel to the gap, the pin pushes the ball through the bore in the flat-head nipple towards the first spring.

[0009] A second coupling on the injection needle is an injection material supply coupling. It consists of a second coupling with a first locking sleeve and is located on the flat-head nipple. The second coupling is secured to the flat-head nipple by the first locking sleeve. The end of an injection material supply hose is attached to the other end of the second coupling via an injection material supply port.

[0010] A third coupling is a mounting coupling consisting of a third coupling with a second locking sleeve. It is located on the flat-head nipple. The other end of the third coupling is screwed into the other end of a rod with a second diameter increase. A third spring is positioned between the second locking sleeve and the second diameter increase.

[0011] The injection material supply connection is a tubular extension that is screwed into the second coupling through the first locking sleeve. Opposite this, it has a first diameter increase, with a second spring 18 arranged on the tubular extension between the first locking sleeve and the first diameter increase.

[0012] The advantage of the invention is that in the injection drill needle according to the invention the sharp bore edges are drawn inwards, i.e. an edge rounding is created, whereby no material removal takes place when pushing or impact-rotating the injection drill needle through the joint seal and it is ensured that all joints are completely sealed.

[0013] The invention is explained in more detail below using an exemplary embodiment. The accompanying drawings show Fig. 1 an injection drill needle according to the invention, Fig. 2 an injection drill needle according to the invention with valve opener, Fig. 3a an injection material supply coupling, Fig. 3b an injection drill needle with injection material supply coupling, Fig. 4a and Fig. 4b an arrangement of injection needles in a sealing joint, and Fig. 5 a mounting coupling.

[0014] Corresponding parts are marked with the same reference symbols.

[0015] Fig. Figure 1 shows an injection drill needle according to the invention for the subsequent sealing of sealing joints such as annular joints, longitudinal joints or expansion joints, in particular sealing joints in tunnels, tunnel segments, joint strips or B-profiles. It consists of a long, thin tube section 1 with a tip 2, wherein a transverse bore 3 for the exit of the injection material is arranged in the tube section 1, near the tip 2. In the exemplary embodiment, the tube section 1 is glued and pressed into a flat-head nipple 7, but it could also be screwed in. The interior of the tube section 1 is the end of an injection channel 20. The sharp bore edges on the transverse bore 3 are drawn inwards, thereby creating an edge rounding. This ensures that when the injection drill needle is forced through a joint seal 12 by impact or even just by impact, Fig. 4a and Fig. 4b, no material removal takes place. Due to the non-machining deburred transverse bore 3, in which the bore edges are drawn inwards, the joint seal 12 closes itself again when the injection needle is removed. The end of the pipe section 1 opposite the tip 2 is arranged in the flat-head nipple 7 with a first spring 4 and a ball 5. A short support tube 6 is loosely arranged on the pipe section 1 and is pushed against the flat-head nipple 7 until it stops. The inner diameter of the support tube 6 is only slightly larger than the outer diameter of the long pipe section 1, and the outer diameter of the support tube 6 is smaller than the joint width. The end of the flat-head nipple 7 is cylindrical. It tapers between the cylindrical end of the flat-head nipple 7 and its hexagon 24. The connecting couplings engage here. A mounting coupling is used to connect the flat-head nipple 7 via the hexagon 24. Fig. 5, the injection drill needle or the pipe section 1 with the tip 2 and the transverse bore 3 through the joint seal 12, Fig. 4a and Fig. 4b, pressed or rotated through the joint seal 12. The rotational movement is transferred via the hexagon 24 to the third clutch 16 during the rotating push-through. Fig. 5, transferred to the injection drill needle.

[0016] Fig. Figure 2 shows a first connection coupling to the injection drill needle according to Fig. 1 with an injection channel opening and closing coupling, called a valve opener, consisting of a first coupling 8 and an actuator 9. The first coupling 8 has a receptacle on one side for the flat-head nipple 7, similar to a sliding coupling, and no sealing ring on the side of the flat-head nipple 7, creating a gap 14. The first coupling 8 is drilled through and has an internal thread on the opposite side, which can extend to the middle of the first coupling 8. The actuator 9 is screwed into this internal thread. Towards the ball 5, the actuator 9 has a small cylindrical diameter, i.e., a kind of pin, for example, pin 25, whose outer diameter is slightly smaller than the bore in the flat-head nipple 7 between the ball 5 and its end. After the small diameter, the actuator 9 has a larger diameter, which is, however, slightly smaller than the bore in the first coupling 8.The actuator 9 then has an external thread on a slightly enlarged diameter, which is screwed into the internal thread of the first coupling 8. When the actuator 9 is screwed into the first coupling 8 until it reaches its stop 27, the pin 25 pushes the ball 5 towards the first spring 4, thus opening the valve in the flat-head nipple 7. When the actuator 9 is unscrewed again until the pin 25 no longer rests against the ball 5, the valve in the flat-head nipple 7 is closed. The actuator 9 may still be held in the thread at this point. This type of valve opener is only one embodiment; theoretically, it could look completely different. The important thing is that a small pin, for example a stud, pushes the ball 5 out of its seat.The first coupling 8 is slid over the flat-head nipple 7 like a sliding coupling, and the actuator 9 is screwed into the first coupling 8. The actuator, via the pin 25, pushes the ball 5 towards the first spring 4, thereby opening the injection channel 20 to the gap 14. This creates a connection between the injection channel 20 and the gap 14, thus opening the valve. The seal in the first coupling 8 is removed to create the gap 14; if necessary, the gap can be widened further.

[0017] Fig. Figure 3a shows a second connection coupling, an injection material supply coupling. It consists of a first locking sleeve 11, which is cup-shaped, and a second coupling 10, in which an injection material supply hose (not shown) terminates via the injection material supply connection. Cup-shaped here means cylindrical. The second coupling 10 is a sliding coupling, which according to Fig. 3b is pushed over the flat-head nipple 7. The injection material supply connection consists of a tubular extension 17, which is screwed into the second coupling 10, for example, and has a first diameter increase 19 on the other side. A second spring 18 is located on the tubular extension 17 between the second locking sleeve 11 and the first diameter increase 19.

[0018] Fig. Figure 3b shows an injection drill needle with a connected second coupling, the injection material supply coupling. The injection material supply coupling consists of the first locking sleeve 11 and the second coupling 10 with the injection material supply connection. Unlike the coupling side to the flat-head nipple 7 of the injection drill needle, the second coupling 10 has an internal thread into which the tubular extension 17 of the injection material supply connection screws. The first locking sleeve 11 is large enough to allow the second coupling 10 and the flat-head nipple 7 to fit inside up to the rear of its hexagonal head. The base of the first locking sleeve 11 has a central round opening whose inner diameter is slightly larger than the outer diameter of the tubular extension 17.A second spring 18, whose inner diameter is slightly larger than the outer diameter of the tubular extension 17, is located between the end of the first locking sleeve 11 and the first diameter increase 19 of the tubular extension 17. The first locking sleeve 11 is slid over the second coupling 10. The tubular extension 17 with the second spring 18 is screwed into the second coupling 10 through the round opening of the cup-shaped first locking sleeve 11. To connect the injection material supply coupling to the flat-head nipple 7 or the injection drill needle, the first locking sleeve 11 is pressed towards the injection material supply hose, and the second coupling 10, designed as a sliding coupling, is slid over the flat-head nipple 7.The first locking sleeve 11 is then released, so that it passes over the flat-head nipple 7 and secures the second coupling 10 to the flat-head nipple 7, thus preventing the sliding coupling from detaching from the flat-head nipple 7 during injection. Both the tubular extension 17 and the second coupling 10 have a longitudinal bore, the injection channel 20, through which the injection material flows from the injection material supply port to the injection drill needle.

[0019] Fig. 4a and Fig. Figure 4b shows an arrangement of injection needles in a joint 13. For subsequent sealing of joints 13, injection needles according to the invention are inserted into the joint 13 at defined intervals, with the tip 2 and the transverse bore 3 of the pipe section 1 projecting through the joint seal 12 in the joint 13. The support tube 6 on the pipe section 1 is slightly shorter than the pipe section 1, at least so much shorter that the transverse bore 3 of the pipe section 1 projects out of the joint seal 12 on the uphill side after the injection needle has been screwed in. The support tube 6 is pushed onto the pipe section 1; it is thus located between the flat-head nipple 7 and the joint seal 12. When the injection needle is screwed through the joint seal 12, the support tube 6 stabilizes the pipe section 1 and the injection needle, respectively. The end face of the support tube 6 also serves as a stop against the joint seal 12.Only the injection needle, with its tip 2 and transverse bore 3, penetrates the joint seal 12. The support tube 6 prevents the pipe section 1 or the injection needle from bending or kinking. The inner diameter of the support tube 6 is only slightly larger than the outer diameter of the pipe section 1. The outer diameter of the support tube 6 is chosen so that it fits into the joint 13 without requiring the joint 13 to be drilled out. The stability provided by the support tube 6 allows the long pipe section 1 or the injection needle to be made significantly longer, for example, one meter.

[0020] In the exemplary embodiment, the following is located in Fig. 4a On the lowest injection drill needle, the second coupling 10 with the first locking sleeve 11 is attached, which secures the second coupling 10 to the flat-head nipple 7. The end of an injection material supply hose is attached to the second coupling 10. The second coupling 10 with the first locking sleeve 11 is pushed over the flat-head nipple 7 like a sliding coupling, as described in Fig. 3. A valve opener, consisting of the first coupling 8 (which lacks a sealing ring towards the flat-head nipple 7, thus creating a gap 14) and the actuator 9, is pushed onto the injection bore needle above it via the flat-head nipple 7. The actuator 9 is screwed into the first coupling 8, so that the valve is opened by the ball 5 being pushed back by pin 25. The missing sealing ring creates a connection from the injection channel 20 to the gap 14. The first coupling 8 can only be pushed over the flat-head nipple 7 when the actuator 9 is screwed back. Above this is the injection bore needle according to... Fig. 1 shown.

[0021] The lowest injection needle now pumps enough injection material into the joint 13 behind the joint seal 12 until injection material or colored water emerges from the gap 14 at the injection needle above it, the connection point between the flat-head nipple 7 and the first coupling 8. This indicates that sufficient injection material has been injected behind the joint seal 12. The injection material then flows out of the gap 14 via the transverse bore 3 of the injection needle above it and through its injection channel 20. Therefore, if water is present on the upstream side, water will emerge from the valve opening or from the gap 14. When injection material or colored water (i.e., a mixture of water and injection material) emerges from the gap 14 at the end of the injection process, the actuator 9 in the first coupling 8 is screwed back until the valve closes.Then the injection channel opening and closing coupling, called valve opener, is pushed off the flat head nipple 7 as a sliding coupling, i.e. removed and attached to the one above it, in the exemplary embodiment . Fig. 4b of the uppermost injection needle. After assembly, the actuator 9 is screwed in until it reaches stop 27, thus opening the valve. Now the injection material supply coupling is removed from the lowermost injection needle and attached to the one above it, from which injection material or colored water is currently flowing. Then injection is carried out through the second injection needle until injection material or colored water flows from the next one above it, in the exemplary embodiment. Fig. 4b of the uppermost injection needle with open valve. This process repeats until the last injection needle, in the exemplary embodiment Fig. 4a and Fig. 4b is no longer shown, it was injected.

[0022] After the injection is complete, the valve opener and the injection material supply coupling are removed. The first locking sleeve 11 must be retracted while attaching or removing the injection material supply coupling. The injection drill needle can then be rotated and removed using a mounting coupling as described below. Fig. 5, are pulled out of the joint seal 12. Finally, the support tube 6 is pulled out of the joint 13 using pliers. The pliers are, for example, nippers with a round notch whose diameter is, in particular, slightly smaller than the diameter of the support tube 6, so that the support tube 6 is not damaged. All parts can be reused after thorough cleaning.

[0023] It is also possible to install several injection boreholes at once, for example twenty, and to equip several of them, but no more than nineteen, with open valve openers, starting after the injection borehole with the injection material supply hose. If water is present on the uphill side, it will flow or drip out of the open valve openers as far as the water level outside reaches, thus allowing the water level to be determined. The injection always begins at the lowest injection borehole and proceeds step by step upwards to the next injection borehole.For example, if, during injection via the lowest injection needle, no injection material or colored water emerges from the connection point of the flat-head nipple 7 and the first coupling 8 (i.e., the gap 14) of the open valve of the nearest injection needle, but rather from the gap 14 of one of the following open valves, this area behind the joint seal 12 is fully injected. Injection then continues via the injection needle directly above until either injection material or colored water emerges from a gap 14 of the open valves above, or, if nothing emerges from any gap 14, until the specified pressure is reached. This process is continued until injection has been performed via the last injection needle.

[0024] Fig. Figure 5 shows a third connection coupling to the injection drill needle according to Fig.1, a mounting coupling. The upper figure shows the mounting coupling in a 3D view looking towards the coupling side, and the lower figure shows a section with the attached injection drill needle. The mounting coupling consists of a second locking sleeve 15 and a third coupling 16. The third coupling 16 has a receptacle on one side for the flat-head nipple 7, similar to a sliding coupling, and an internal thread on the other side for connecting a cylindrical rod 21, which has a second diameter increase 22 approximately in the middle, serving as a stop for a third spring 23. The third spring 23 sits between the second diameter increase 22 and the second locking sleeve 15. The length of the second locking sleeve 15 corresponds approximately to the length of the third coupling 16, so that the hexagon 24 of the flat-head nipple 7 lies within the second locking sleeve 15.The third coupling 16 is milled out slightly larger on the coupling side to the injection needle than the hexagon 24 of the flat-head nipple 7, creating two external ribs 26 that act as guides for transmitting the rotary motion from the third coupling 16 via the hexagon 24 to the injection needle. In this embodiment, the end of the rod 21 opposite the third coupling 16 is cylindrical and is designed for insertion into a drill chuck. The mounting coupling, which is inserted into the chuck of a hammer drill or similar tool via its cylindrical rod 21, serves to insert the injection needle into the joint seal 12 and to withdraw the injection needle after the injection is complete.The injection drill needle is coupled to the mounting coupling by pulling the second locking sleeve 15 towards the third spring 23 and pushing the flat-head nipple 7 into the third coupling 16, similar to a sliding coupling. This causes two surfaces of the hexagon 24 of the flat-head nipple 7 to slide between the two ribs 26 of the third coupling 16, thus transmitting the rotary motion of the impact drill to the injection drill needle via the mounting coupling. Finally, the second locking sleeve 15 is released; the third spring 23 pushes it towards the injection drill needle, securing it to the mounting coupling. REFERENCE MARK LIST 1 pipe section 2 top 3 transverse bores 4 first spring 5 balls 6 support tube 7 flat head nipples 8 first clutch 9 actuators 10 second clutch 11 first locking sleeve 12 Joint sealant 13 joint 14 columns 15 second safety sleeve 16 third clutch 17 tubular extension 18 second spring 19 first diameter enlargement 20 injection channels 21 poles 22 second diameter enlargement 23 third spring 24 Hexagon 25 cones 26 Bridge 27 attacks QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2013 008 448 B4

[0002] DE 20 2019 106 990 U1

[0005] Cited non-patent literature

[0000] Catalogue number 15 from the year 2018 of the company “DESOI GmbH”, page 103 ff.

[0003]

Claims

[1] Reusable injection drill needle with connecting couplings for subsequent sealing of sealing joints, consisting of a pipe section (1) with a tip (2) and a transverse bore (3) immediately in front of the tip (2), in which a slightly shorter support tube (6) is arranged on a long pipe section (1), wherein the inner diameter of the support tube (6) is insignificantly larger than the outer diameter of the long pipe section (1) and the outer diameter of the support tube (6) is smaller than the joint width, wherein the end opposite the tip (2) terminates in a flat-head nipple (7) with a first spring (4) and a ball (5) and in which the bore edges of the transverse bore (3) are drawn inwards. [2] Injection drill needle according to claim 1, characterized by, that a first connecting coupling is a valve opener, consisting of a first coupling (8) with an actuator (9) which is screwed into the first coupling (8) up to a stop (27) and has a pin (25) at the insertion end, the outer diameter of which is slightly smaller than the bore in the flat head nipple (7) and which, to open the injection channel (20) to the gap (14) through this bore in the flat head nipple (7), presses the ball (5) to the first spring (4). [3] Injection drill needle according to claim 1, characterized by , that a second connecting coupling is an injection material supply coupling, consisting of a second coupling (10) with a first locking sleeve (11) arranged on the flat head nipple (7), wherein the second coupling (10) is fixed to the flat head nipple (7) by the first locking sleeve (11), and the end of an injection material supply hose is attached to the other end of the second coupling (10) via an injection material supply connection. [4] Injection drill needle according to claim 1, characterized by , that a third connecting coupling is a mounting coupling consisting of a third coupling (16) with a second locking sleeve (15) arranged on the flat head nipple (7), wherein an end of a rod (21) with a second diameter enlargement (22) is screwed into the other end of the third coupling (16), wherein a third spring (23) is arranged between the second locking sleeve (15) and the second diameter enlargement (22). [5] Injection drill needle according to claim 3, characterized by , that the injection material supply connection is a tubular extension (17) which is screwed into the second coupling (10) through the first locking sleeve (11) and has a first diameter increase (19) opposite it, wherein a second spring (18) is arranged on the tubular extension (17) between the first locking sleeve (11) and the first diameter increase (19). [6] Injection drill needle according to any one of claims 1 to 5, characterized by , that the long pipe section (1) is screwed into the flat head nipple (7). [7] Injection drill needle according to any one of claims 1 to 5, characterized by , that the long pipe section (1) is glued into the flat head nipple (7). [8] Injection drill needle according to any one of claims 1 to 5, characterized by , that the long pipe section (1) is glued and additionally pressed into the flat head nipple (7).

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