Sleeve grouting assembly and sleeve grouting anchor rod / cable

Abstract

The utility model relates to a casing grouting assembly and a casing grouting anchor rod / cable, the casing grouting assembly comprises a grouting block, a flexible metal pipe and a hole sealing plug, the grouting block comprises a shell internally provided with a liquid injection cavity and a connecting pipe fixedly arranged on the front side wall of the shell, the connecting pipe is connected with the flexible metal pipe, and the front end of the connecting pipe extends to the rear end face of the hole sealing plug; a first through hole communicating with the liquid injection cavity and the connecting pipe is formed in the front side wall of the shell, a second through hole opposite to the first through hole is formed in the rear side wall of the shell, and a grouting pipe communicating with the liquid injection cavity is further fixedly arranged on the shell. According to the grouting device, the casing pipe is the flexible metal pipe and can be conveniently matched with anchor rods / cables in various length ranges, the spiral structure of the flexible metal pipe is utilized, the flexible metal pipe is connected with the connecting pipe in a threaded mode, the connecting efficiency of the flexible metal pipe and the connecting pipe is improved, the grouting device and the grouting pipe are connected through the clamping jaw and the opening clamping ring, and the grouting efficiency is improved. And the locking nut is used for locking, so that the connecting efficiency between the grouting device and the grouting pipe is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mine roadway supporting technical field especially anchor rod and anchor cable support accessory, concretely refers to a casing pipe grouting assembly and casing pipe grouting anchor rod / cable. BACKGROUND

[0002] The coal mining scale in China is huge, and the excavated roadway reaches 15,000 kilometers per year. Due to the complex geological conditions in China, there are a large number of soft rock roadways, fault fracture zone roadways and dynamic pressure roadways, and their support or maintenance is very difficult. A large number of theories and tests prove that the full anchor or anchor injection support is one of the most effective measures to solve the support problems of these roadways. The mature technology of full anchor or anchor injection support is to use the hollow structure of the hollow grouting anchor rod and the hollow grouting anchor cable to realize grouting, and the hollow grouting anchor rod and the hollow grouting anchor cable have high cost, complex processing and low breaking force of the same diameter rod body compared with ordinary resin anchor rod / cable. How to realize full anchor or anchor injection with ordinary resin anchor rod / cable, reduce construction cost and improve anchoring strength has been a research topic in the mining industry.

[0003] The utility model right (application number 201821498402.9) is a mine anchor injection device, which is provided with an ordinary resin anchor rod to realize grouting. This anchor injection device adopts a forward grouting mode from the orifice to the hole bottom, which is not conducive to the discharge of gas in the borehole and has high requirements for the sealing quality. The utility model right (application number 202222824678.4) is an anchor hole grouting device, anchor injection anchor rod and anchor injection anchor cable, which provides a grouting device. The grouting mode has been improved compared with the previous anchor device. However, there are problems such as complicated grouting connection mode and special tray for anchor cable grouting. UTILITY MODEL CONTENT

[0004] In view of the deficiencies of the prior art, the utility model provides a casing pipe grouting assembly and casing pipe grouting anchor rod / cable. The casing pipe grouting assembly can be applied to anchor rods and anchor cables of various length ranges, and full anchor or anchor injection can be easily realized.

[0005] The utility model is realized through the following technical schemes, and provides a casing pipe grouting assembly, which comprises a grouting block, a flexible metal pipe and a hole sealing plug sleeved on the flexible metal pipe. The grouting block comprises a shell with a liquid injection cavity inside and a connecting pipe fixed to the front side wall of the shell. The connecting pipe is connected with the flexible metal pipe, and the front end of the connecting pipe extends to the rear end surface of the hole sealing plug. The front side wall of the shell is provided with a first perforation communicating with the liquid injection cavity and the connecting pipe, and the rear side wall of the shell is provided with a second perforation opposite to the first perforation. A grouting pipe communicating with the liquid injection cavity is also fixed to the shell.

[0006] In use, the anchor bolt or cable passes sequentially through the second perforation, the injection chamber, the first perforation, and the flexible metal pipe. Grout is injected into the injection chamber through the grouting pipe. The grout flows to the anchoring section through the gap between the anchor bolt / cable and the flexible metal pipe. The gap between the flexible metal pipe and the borehole wall of the surrounding rock is sealed by a sealing plug to prevent backflow of grout. By using a flexible metal pipe as the casing, it can better adapt to the length of the anchor bolt / cable, facilitating full-length anchoring. The connecting pipe facilitates connection with the flexible metal pipe.

[0007] As an optimization, the outer arc surface of the sealing plug is conical, and the outer diameter of the front end of the sealing plug is smaller than the outer diameter of the rear end. This optimization scheme, by setting the outer arc surface of the sealing plug to be conical, facilitates the installation of the sealing plug, improves the sealing effect of the sealing plug, and ensures the firmness of the sealing plug installation.

[0008] As an optimization, the flexible metal tube has a threaded wall structure, and the flexible metal tube is connected to the connecting tube via threads. This optimization scheme sets the wall of the flexible metal tube to a threaded structure, which facilitates the connection with the connecting tube and also avoids damage to the flexible metal tube caused by machining threads on it.

[0009] As an optimization, the grouting pipe includes a pipe body fixedly connected to the shell, and an open retaining ring sleeved and fixed to the end of the pipe body away from the shell. The open retaining ring has at least two notches spaced apart circumferentially. This optimization scheme, by setting the open retaining ring, facilitates quick engagement with the grouting mechanism and improves construction efficiency.

[0010] As an optimization, a grouting device is also included. The grouting device comprises an inner tube and an outer tube sleeved on the inner tube. A first limiting platform is fixed on the inner tube to restrict the forward movement of the outer tube. The front end of the inner tube is adapted to the grouting pipe, and the front end of the outer tube is fixed with a clamping claw adapted to the open retaining ring. This optimized solution, by setting up a grouting device, facilitates the connection between the grouting machine and the grouting pipe. The clamping claw engages with the open retaining ring, and with the blocking effect of the first limiting platform, the clamping claw is tightly locked onto the open retaining ring, achieving a quick connection. Grout is injected from the inner tube, and the outer tube is used for the installation and fixation of the grouting device.

[0011] As an optimization, the claw includes claw bodies distributed circumferentially and corresponding to the notches respectively. A hook body is fixed at the front end of each claw body, extending radially to the front side of the open retaining ring. The diameter of the circle containing the closest ends of each hook body is larger than the diameter of the circle containing the bottom of each notch, but smaller than the outer diameter of the open retaining ring. This optimized claw body structure is simple. In use, the hook body passes through the notch, and after rotating a certain angle, the open retaining ring portion between adjacent notches forms a barrier against the claw, thereby achieving a locking connection and greatly improving the connection efficiency between the grouting device and the grouting pipe.

[0012] As an optimization, a rotation stop bar is fixed to the side of the open retaining ring facing the housing, and the rotation stop bar protrudes from the side of the open retaining ring facing the housing. This optimization scheme, by setting the rotation stop bar, facilitates the limitation of the rotation of the retaining claw, preventing the retaining claw from rotating too much and dislodging from the notch, further improving the speed of installation operations.

[0013] As an optimization, a sealing arrangement is provided between the front side of the first limiting platform and the side of the open retaining ring away from the housing. This optimized solution utilizes the sealing arrangement between the front side of the first limiting platform and the open retaining ring to prevent slurry leakage and simplify the structure.

[0014] As an optimization, the rear end of the outer tube is provided with an external threaded section, on which a locking nut is threadedly connected. A collar extending radially and located behind the external threaded section is fixed to the locking nut. A second limiting platform is fixed to the inner tube to restrict the forward movement of the collar. This optimized solution restricts the forward movement of the locking nut by the second limiting platform. When the clasp is engaged with the open retaining ring, rotating the nut utilizes the thread to move the outer tube backward, thereby improving the tightness between the clasp and the open retaining ring and achieving locking.

[0015] As an optimization, a sealing plug is also included. The sealing plug has a through hole corresponding to the inner hole of the connecting pipe, and its outer surface has a tapered surface that is smaller at the front and larger at the back. The wall of the second perforation is adapted to the tapered surface of the sealing plug. This optimized solution seals the gap between the anchor rod / cable and the wall of the second perforation by setting a sealing plug at the second perforation, preventing grout from flowing out of the second perforation.

[0016] The beneficial effects of this utility model are as follows: By setting the casing as a flexible metal tube, it is easy to adapt to anchor bolts and anchor cables of various lengths, enabling reverse grouting and expelling gas from the borehole. Utilizing the spiral structure of the flexible metal tube, it is connected to the connecting pipe via threads, improving the connection efficiency between the flexible metal tube and the connecting pipe. The grouting device and the grouting pipe are connected by claws and open retaining rings, and locked with a locking nut, further improving the connection efficiency between the grouting device and the grouting pipe. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 for Figure 1 Enlarged view of a portion of the image;

[0019] Figure 3 This is a schematic diagram of the grouting device structure of this utility model;

[0020] Figure 4 for Figure 3 Enlarged view of a portion of the image;

[0021] Figure 5 This is a schematic diagram of an open-ended retaining ring structure;

[0022] Figure 6 This is a schematic diagram of the chuck structure;

[0023] Figure 7 This is a usage diagram of Embodiment 3 of this utility model;

[0024] Figure 8 for Figure 7 Enlarged view of a portion of the image;

[0025] Figure 9 This is a usage diagram of Embodiment 2 of this utility model;

[0026] As shown in the figure:

[0027] 1. Flexible metal tube, 2. Sealing plug, 3. Grouting block, 4. Grouting pipe, 5. Sealing plug, 6. Connecting pipe, 7. First perforation, 8. Opening retaining ring, 9. Injection chamber, 10. Shell, 11. Second perforation, 12. Groove, 13. Rotating stop bar, 14. Mining quick connector, 15. Locking nut, 16. Outer tube, 17. Inner tube, 18. Claw, 19. End sealing gasket, 20. First limiting platform, 21. Second limiting platform, 22. Grouting device, 23. Anchor, 24. Cable body. Detailed Implementation

[0028] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0029] Example 1

[0030] like Figure 1 The illustrated casing grouting assembly includes a grouting block 3, a flexible metal tube 1, and a sealing plug 2 fitted onto the flexible metal tube. The flexible metal tube 1 has a threaded wall structure. In this embodiment, the flexible metal casing is a thin-walled tube with a wall thickness of 0.1-0.5 mm and an external corrugated thread shape. The bending diameter is not less than 1 m, which facilitates construction operations in confined spaces such as downholes and facilitates transportation. In actual manufacturing, corrugated metal pipes from existing technologies can be used.

[0031] The grouting block 3 includes a shell 10 with an internal injection chamber 9 and a connecting pipe 6 fixed to the front side wall of the shell. The shell is cylindrical and the shell and the connecting pipe are coaxial, with their axes extending in the front-rear direction.

[0032] The connecting pipe 6 is connected to the flexible metal pipe 1. In this embodiment, the inner wall of the connecting pipe is provided with an internal thread that is adapted to the flexible metal pipe. The flexible metal pipe 1 extends into the connecting pipe 6 and is connected to the connecting pipe 6 by the thread, thereby realizing the quick connection between the connecting pipe and the flexible metal pipe.

[0033] The front end of the connecting pipe 6 extends to the rear end face of the sealing plug 2, and the front end of the sealing plug extends forward to the borehole in the tunnel. The sealing plug is used to seal the gap between the flexible metal pipe and the borehole wall to prevent slurry from flowing out. In this embodiment, the outer arc surface of the sealing plug 2 is conical, and the outer diameter of the front end of the sealing plug is smaller than the outer diameter of the rear end. During installation, the entire flexible metal pipe is pushed into the borehole as a sleeve by the thrust of the anchor bolting machine, sealing the gap between the sleeve and the borehole. As the sealing plug is pushed into the hole during installation, the contact between the sealing plug and the borehole wall becomes tighter and tighter, ensuring the fixing effect of the sealing plug. Several protrusions are fixed on the outer wall of the sealing plug, further improving the fixing effect of the sealing plug in the borehole.

[0034] The front side wall of the housing has a first through hole 7 that connects the injection chamber 9 and the connecting pipe, and the rear side wall of the housing has a second through hole 11 that is opposite to the first through hole 7. The first through hole 7 and the second through hole 11 are coaxial and are used to insert anchor rods or anchor cables. The rod body of the anchor rod or the cable body 24 of the anchor cable passes through the second through hole, the injection chamber, the first through hole and the flexible metal pipe in sequence.

[0035] The shell is also fixedly provided with a grouting pipe 4 communicating with the injection chamber for injecting grout into the injection chamber. In this embodiment, the grouting pipe 4 includes a pipe body fixedly connected to the shell, and an open retaining ring 8 sleeved and fixed to the end of the pipe body away from the shell. The open retaining ring 8 is provided with at least two notches 12 spaced apart circumferentially. In order to improve processing efficiency, this embodiment provides two notches, and the two notches are radially opposite each other. The notches are used for the jaws to pass forward, and the open retaining ring portion between the notches forms a blockage against the jaws.

[0036] The angle between the axis of the pipe body and the axis of the connecting pipe is less than 90°, and the end of the pipe body away from the shell is located behind the other end. The end of the pipe body away from the shell serves as the grouting nozzle. The grouting nozzle is set at an angle downward to facilitate quick insertion and connection, thereby enabling a rapid connection and grouting process.

[0037] The grouting assembly in this embodiment also includes a grouter 22, which connects the grouting pipe and the external grouting pipe. Specifically, the grouter 22 includes an inner tube 17 and an outer tube 16 sleeved on the inner tube 17. The outer tube and the inner tube can rotate and slide relative to each other. A first limiting platform 20 is fixed on the inner tube 17 to restrict the forward movement of the outer tube 16. The first limiting platform is closed circumferentially. The front end of the inner tube is adapted to the grouting pipe. In this embodiment, the front and rear ends of the inner tube extend out of the outer tube, with the front end of the inner tube extending into the inner hole of the grouting pipe. The front side of the first limiting platform 20 is sealed with the side of the open retaining ring away from the housing. To improve the sealing effect, an end sealing gasket 19 is provided between the first limiting platform 20 and the open retaining ring. The first limiting platform 20 and the open retaining ring press the end sealing gasket together to achieve a reliable seal.

[0038] To further improve the sealing effect, an O-ring is installed on the part of the inner tube that extends to the grouting pipe.

[0039] The front end of the outer tube is fixed with a claw 18 that is adapted to the open retaining ring 8. The claw is fixed on the side of the outer tube, and the front end of the outer tube faces forward and pushes against the rear side of the first limiting platform.

[0040] The claw 18 includes claw bodies distributed circumferentially and corresponding to the slots 12 respectively. The claw bodies extend forward axially from the outer side of the outer tube. The front end of the claw body is fixed with a hook body that extends radially to the front side of the open retaining ring. The diameter of the circle where the ends of each hook body are close to each other is larger than the diameter of the circle where the bottom of each slot is located, and smaller than the outer diameter of the open retaining ring. An installation space adapted to the thickness of the open retaining ring is formed between the hook body and the first limiting platform.

[0041] A rotating stop bar 13 is fixed to the side of the open retaining ring facing the housing, and the rotating stop bar 13 protrudes from the side of the open retaining ring facing the housing. After the hook of the claw body passes forward through the notch, it rotates at a certain angle to achieve the engagement of the claw with the open retaining ring. The rotating stop bar prevents the claw from continuing to rotate, avoiding excessive rotation angle and disengagement from the next notch.

[0042] The outer tube has an external threaded section at its rear end, on which a locking nut 15 is threadedly connected. A collar extending radially and located behind the external threaded section is fixed to the locking nut 15. A second limiting platform 21 is fixed to the inner tube to restrict the forward movement of the collar. The second limiting platform is circumferentially closed, and its diameter is larger than the diameter of the collar's hole. The inner tube extends rearward from the inner hole of the collar, and a mining quick-connect plug 14 is threadedly connected to its rear end. The mining quick-connect plug 14 connects to an external grouting pipe, enabling rapid connection. The mining quick-connect plug uses existing technology and is readily available.

[0043] As the inner tube is inserted into the grouting nozzle, the hook of the clamp moves to the front of the open retaining ring through the notch. Rotating the clamp to the right engages the two. To prevent them from disengaging through reverse rotation, tighten the locking nut. The thread and second limiting platform cause the clamp to move backward, further tightening it, thus completing the quick connection. A rotation stop bar provides an endpoint for the clamp's rotation, facilitating operation. The locking nut has a textured surface for easy gripping and tightening. The end seal is made of elastic material with a diameter 2-4mm larger than the distance between the clamps to prevent it from falling off. The end seal also transforms the metal-to-metal contact between the grouting nozzle and the quick grouter into an elastic contact, making it easier to manually tighten the locking nut.

[0044] The grouting assembly in this embodiment also includes a sealing plug 5. The sealing plug 5 has a through hole corresponding to the inner hole of the connecting pipe 6. This through hole is used to pass through the rod of the anchor bolt or the cable of the anchor cable, and is coaxial with the inner hole of the connecting pipe 6. The outer surface of the sealing plug has a tapered surface that is smaller at the front and larger at the back. The wall of the second perforation is adapted to the tapered surface of the sealing plug. In actual use, the anchor 23 is used to press the sealing plug, sealing the gap between the second perforation and the anchor bolt / cable. During grouting, the grout flows along the casing direction towards the bottom of the borehole, preventing the grout from flowing out of the second perforation.

[0045] The grouting assembly in this embodiment can realize the principle of reverse grouting, which can better ensure full anchoring of grouting. The quick connection between the grouter's claw and the grouting nozzle opening retainer of the grouting ring block is improved by engaging and locking, thus improving work efficiency.

[0046] For ease of transportation and construction, flexible metal pipes can be connected using connecting sleeves. These sleeves can be connected via the internal or external threads of the flexible metal pipe. Internally threaded sleeves are used for smaller holes, while externally threaded sleeves are used for larger holes. Both types of sleeves are designed to match the flexible pipe's threads and are typically manufactured using injection molding or machining, resulting in high mold and processing costs. To reduce manufacturing costs and simplify the connecting sleeves, the grouting assembly in this embodiment also includes a misaligned threaded connecting sleeve. This sleeve can be connected to the flexible metal pipe by adjusting its internal or external dimensions. The misaligned threaded connecting sleeve is made from the flexible pipe material, with a thread pitch 0.05-0.1mm different from the flexible metal pipe's thread pitch. This allows the flexible metal pipe to be screwed into the misaligned threaded connecting sleeve by 3-5 thread pitches, tightening the two together without the need for an intermediate retaining ring. This allows the misaligned threaded connecting sleeve to provide more internal and external diameter space, ensuring smooth grout flow.

[0047] Example 2

[0048] This embodiment provides a casing grouting anchor bolt, which includes a rod body and the casing grouting assembly described in Embodiment 1. The rod body extends through a first through hole 7 to a flexible metal tube 1. A nut is installed on the rod body; the nut can be made using existing technology. During installation, the rod body is sequentially passed through the inner hole of the sealing plug, the second through hole, the injection chamber, the first through hole, and the flexible metal tube.

[0049] Example 3

[0050] This embodiment provides a casing grouting anchor cable. The casing grouting anchor cable of this embodiment includes a cable body 24 and the casing grouting assembly described in Embodiment 1. The cable body extends through the first perforation 7 to the flexible metal tube 1. Anchors 23 are installed on the cable body 24. The anchors 23 can be made using existing technology. During installation, the cable body is sequentially passed through the inner hole of the sealing plug, the second perforation, the injection chamber, the first perforation, and the flexible metal tube.

[0051] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A casing grouting assembly, characterized in that: The grouting block (3), the flexible metal tube (1), and the sealing plug (2) sleeved on the flexible metal tube are included. The grouting block (3) includes a shell (10) with an internal injection chamber and a connecting pipe (6) fixed to the front side wall of the shell. The connecting pipe (6) is connected to the flexible metal tube (1), and the front end of the connecting pipe (6) extends to the rear end face of the sealing plug (2). The front side wall of the housing is provided with a first through hole (7) connecting the injection chamber and the connecting pipe, and the rear side wall of the housing is provided with a second through hole (11) opposite to the first through hole (7). The housing is also fixed with a grouting pipe (4) connecting the injection chamber.

2. The casing grouting assembly according to claim 1, characterized in that: The outer arc surface of the sealing plug (2) is conical, and the outer diameter of the front end of the sealing plug is smaller than the outer diameter of the rear end of the sealing plug.

3. The casing grouting assembly according to claim 1, characterized in that: The flexible metal tube (1) has a threaded wall structure, and the flexible metal tube (1) is connected to the connecting tube (6) by threads.

4. A casing grouting assembly according to claim 1, characterized in that: The grouting pipe (4) includes a pipe body fixed to the shell, and an open retaining ring (8) sleeved and fixed to one end of the pipe body away from the shell. The open retaining ring (8) is provided with at least two circumferentially spaced slots (12).

5. A casing grouting assembly according to claim 4, characterized in that: It also includes a grouting device (22), which includes an inner tube (17) and an outer tube (16) sleeved on the inner tube (17). A first limiting platform (20) is fixed on the inner tube (17) to restrict the forward movement of the outer tube (16). The front end of the inner tube is adapted to the grouting pipe, and the front end of the outer tube is fixed with a claw (18) adapted to the open retaining ring (8).

6. A casing grouting assembly according to claim 5, characterized in that: The claw (18) includes claw bodies distributed circumferentially and corresponding to the slots (12) respectively. The front end of the claw body is fixed with a hook body that extends radially to the front side of the open clasp. The diameter of the circle where the end of each hook body is close to each other is greater than the diameter of the circle where the bottom of each slot is located, and smaller than the outer diameter of the open clasp.

7. A casing grouting assembly according to claim 6, characterized in that: A rotating stop bar (13) is fixed on the side of the open retaining ring facing the housing, and the rotating stop bar (13) protrudes from the side of the open retaining ring facing the housing.

8. A casing grouting assembly according to claim 6, characterized in that: The outer tube has an external threaded section at its rear end, and a locking nut (15) is threaded onto the external threaded section. A collar extending radially and located behind the external threaded section is fixed on the locking nut (15), and a second limiting platform (21) is fixed on the inner tube to restrict the collar from moving forward.

9. A casing grouting anchor bolt, comprising a bolt body, characterized in that: It also includes a casing grouting assembly as described in any one of claims 1 to 8, wherein the rod extends through a first perforation (7) to a flexible metal tube (1).

10. A casing grouting anchor cable, comprising a cable body, characterized in that: It also includes a casing grouting assembly as described in any one of claims 1 to 8, wherein the cable extends through a first perforation (7) to a flexible metal tube (1).

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