A pressure gradient multiple grouting anchor

Abstract

The present invention provides a pressure gradient multiple grouting anchor, comprising a hollow grouting anchor body; the interior of the hollow grouting anchor body is threadedly connected with a sleeve through a first threaded connection part, and the upper end of the hollow grouting anchor body is connected with a grouting plug; a threaded rod is provided at the bottom end of the sleeve, and a lifting nut is also threadedly connected to the threaded rod, and a first spring is connected to the lifting nut, the first spring is sleeved on the outer side of the threaded rod, a bursting piece is provided at the end of the first spring, a positioning ring is welded on the inner wall of the sleeve, a second spring is installed on the positioning ring, a connecting ring is provided at the end of the second spring, and two symmetrical overflow holes are provided on the sleeve and the hollow grouting anchor body; on the one hand, the overflow hole is provided with a bursting piece for facilitating the adjustment of pressure, and on the other hand, a sleeve is added, and the sleeve plays a role in fixing the bursting piece, thereby enhancing the tensile and shear resistance of the anchor body.

Description

Technical Field

[0001] The present application relates to the technical field of grouting anchor rods, and in particular to a pressure gradient multiple grouting anchor rod. Background Art

[0002] Grout is widely used in geotechnical engineering. In the process of tunneling and mining, it is often necessary to reinforce some broken areas, areas with poor geological conditions, and areas threatened by pressurized water on the bottom of the coal seam by grouting. When burying urban domestic garbage, in order to prevent toxic liquids from penetrating and causing water and soil pollution, it is also necessary to grout the bottom and surrounding walls of the burial area. The storage of nuclear waste also needs to consider the impact of radioactive substances on the environment, and strengthen the rocks around the storage area to avoid irreparable losses. With the development of grouting materials, many slurries with advantages such as fast solidification time and high stone strength have appeared. However, when the local flow rate of the slurry is slow during the grouting process, the slurry is very likely to be blocked in the fracture channel or grouting anchor; in grouting engineering, it is often necessary to carry out secondary grouting reinforcement on the places where the slurry has been injected; in addition, according to the experience of on-site grouting, during the grouting process, the area near the outside of the grouting hole should not use too large a grouting pressure to prevent the slurry from leaking out, while the area deep in the grouting hole should use a larger grouting pressure to achieve a better reinforcement effect. Based on the above problems, a grouting anchor rod capable of realizing multiple grouting with gradient pressure is proposed. Summary of the invention

[0003] In order to make up for the above shortcomings, the present application provides a pressure gradient multiple grouting anchor, which aims to improve the existing grouting process when the local slurry flow rate is slow and the slurry is very easy to get blocked in the fracture channel or the grouting anchor; in grouting projects, it is often necessary to carry out secondary grouting reinforcement on the places where the slurry has been injected; in addition, according to the experience of on-site grouting, during the grouting process, the area close to the outside of the grouting hole should not use too large a grouting pressure to prevent the leakage of slurry, while the area deep in the grouting hole should use a larger grouting pressure to achieve a better reinforcement effect.

[0004] The embodiment of the present application provides a pressure gradient multiple grouting anchor rod, comprising a hollow grouting anchor rod body;

[0005] The interior of the hollow grouting anchor body is threadedly connected with a sleeve through a first threaded connection portion, the upper end of the hollow grouting anchor body is threadedly connected with a grout stopper, a gasket is welded to the upper end of the grout stopper, a nut is provided on one side of the gasket, and the nut is threadedly connected to the sleeve through the first threaded connection portion;

[0006] A threaded rod is provided at the bottom end of the sleeve, a first bevel gear is keyed on the threaded rod, a lifting nut is also threadedly connected to the threaded rod, a first spring is fixedly connected to the lifting nut, the first spring is sleeved on the outer side of the threaded rod, a bursting piece is fixedly provided on the end of the first spring, a positioning ring is welded on the inner wall of the sleeve, a second spring is fixedly installed on the positioning ring, a connecting ring is fixedly provided on the end of the second spring, the second spring and the connecting ring are both sleeved on the outer sides of the first spring, the threaded rod and the lifting nut, two symmetrical overflow holes are provided on the sleeve and the hollow grouting anchor body, the bursting piece is located at the upper end of the overflow hole, the connecting ring is also located at the upper end of the overflow hole, and the thickness of the bursting piece is greater than the diameter of the overflow hole.

[0007] In the above-mentioned implementation process, the present invention, on the one hand, sets pressure devices for bursting discs at different stages on the overflow hole of the conventional grouting anchor rod, and the bursting pressure of the bursting disc is easy to adjust and set, so as to realize grouting at different pressures; on the other hand, a sleeve is added inside the conventional grouting anchor rod, and the sleeve not only plays the role of fixing the bursting disc, but also can be taken out in time at the end of grouting to prevent the slurry from solidifying in the anchor rod. When multiple grouting is required subsequently, it only needs to reinstall the sleeve. After the grouting is finally completed, the sleeve does not need to be taken out, thereby enhancing the tensile and shear resistance of the anchor rod body.

[0008] In a specific embodiment, the bottom end of the sleeve is threadedly connected to a limiting ring through a first threaded connection portion, and the bottom end of the hollow grouting anchor body is fittedly connected to the upper end of the limiting ring.

[0009] In the above implementation process, the setting of the limit ring facilitates the support and fixation of the hollow grouting anchor body to maintain stability.

[0010] In a specific embodiment, the bottom end of the sleeve is threadedly connected to a feeding mechanism through a first threaded connection portion, and the feeding mechanism includes a second threaded connection portion and an anchor head, and the anchor head is configured to be conical.

[0011] In the above implementation process, the setting of the feeding mechanism can realize the installation of the grouting anchor rod into the drilled hole, and the second threaded connection part is convenient for disassembly and assembly, and the anchor head is convenient for insertion.

[0012] In a specific embodiment, an adjustment hole is opened on one side of the bottom end of the sleeve, an adjustment screw is movably arranged inside the adjustment hole, and a hexagonal screw hole is arranged at one end of the adjustment screw.

[0013] In the above implementation process, the adjustment hole facilitates the rotation of the adjustment screw, and the adjustment screw facilitates the rotation of the first bevel gear, and the setting of the hexagonal screw hole facilitates adjustment.

[0014] In a specific embodiment, one end of the adjusting screw in the sleeve is key-connected with a second bevel gear, and the second bevel gear is meshingly connected with the first bevel gear.

[0015] In the above implementation process, the meshing connection between the second bevel gear and the first bevel gear facilitates the rotation adjustment of the threaded rod and the adjustment of the pressure of the first spring.

[0016] In a specific embodiment, a bearing seat is fixedly mounted on the inner bottom end of the sleeve, and the bottom end of the threaded rod is movably connected to the inside of the bearing seat.

[0017] In the above implementation process, the setting of the bearing seat can enable the threaded rod to maintain stable balance when rotating and adjusting.

[0018] In a specific implementation manner, the top end of the threaded rod is fixedly connected to a limit plate, the height of the limit plate is lower than the position of the overflow hole, and the diameter of the limit plate is smaller than the diameter of the first spring.

[0019] In the above implementation process, the setting of the limit plate can effectively prevent the lifting nut from falling off during lifting adjustment, and the diameter of the limit plate is smaller than the diameter of the first spring, which will not hinder the pressure adjustment of the first spring.

[0020] In a specific embodiment, slide grooves are provided on both sides of the inner wall of the sleeve, and sliders are provided on both sides of the bursting disc, and the sliders on both sides slide inside the slide grooves on both sides.

[0021] In the above implementation process, the setting of the slide groove and the slider can enable the bursting disc to move stably during pressure adjustment to prevent rotation and damage to the equipment.

[0022] In a specific embodiment, the length of the chute is 10 cm at both ends of the overflow hole, the chute and the slider are both provided with a rubber layer, and a sealing rubber pad is fixedly connected to the bursting piece.

[0023] In the above implementation process, the length of the slide groove can enable the bursting disc to move under force adjustment, and the setting of the sealing rubber pad and the rubber layer can effectively prevent leakage and cannot achieve pressure adjustment.

[0024] In a specific embodiment, the following method is also included:

[0025] S1. First, use anchoring agent to fix the grouting anchor rod with rupture disc and sleeve in the drill hole, and install the grouting plug;

[0026] S2, turning on the grouting pump, setting the grouting pressure to be slightly greater than the bursting pressure of the bursting disc in the anchor rod under the first spring pressure, and firstly performing low-pressure grouting;

[0027] S3. When the slurry cannot be injected, the grouting pressure is increased to a level slightly greater than the blasting pressure of the rupture disc in the anchor rod under the first spring and the second spring, and grouting is performed at a higher pressure;

[0028] S4, continue to increase the grouting pressure until the grouting pressure is set to a bursting disc slightly greater than the maximum blasting pressure, and stop grouting when the slurry cannot be injected or the designed maximum pressure grouting time is reached;

[0029] S5. If subsequent grouting operations are required, the sleeve of the anchor rod shall be removed after the grouting is completed, and a solid iron rod of the same size as the sleeve shall be inserted at the same time to prevent deformation of the grouting anchor rod. If multiple grouting operations are required, the iron rod shall be removed and reinserted into the sleeve of the anchor rod for reuse.

[0030] In the above implementation process, the above method can make the grouting anchor rod easy to install and use, effectively implement the explanation of the use method of the grouting anchor rod, and facilitate the use and operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the main structure provided by the implementation method of the present application;

[0033] Figure 2 A schematic diagram of a cross-sectional structure provided for an implementation method of the present application;

[0034] Figure 3 Provided for the implementation of this application Figure 2 The schematic diagram of the structure of part A from above;

[0035] Figure 4 Provided for the implementation of this application Figure 2 The enlarged structural diagram of part B is shown in the figure.

[0036] In the figure: 1. hollow grouting anchor body; 2. sleeve; 3. first threaded connection; 4. grout stopper; 5. gasket; 6. nut; 7. threaded rod; 8. first bevel gear; 9. adjustment hole; 10. adjustment screw; 11. second bevel gear; 12. lifting nut; 13. first spring; 14. bursting disc; 15. positioning ring; 16. second spring; 17. connecting ring; 18. overflow hole; 19. limit ring; 20. feeding mechanism; 21. second threaded connection; 22. anchor head; 23. slide groove; 24. slider; 25. limit plate; 26. bearing seat. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0038] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0041] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] See also Figure 1-4 , the present application provides a pressure gradient multiple grouting anchor rod, comprising a hollow grouting anchor rod body 1;

[0046] The interior of the hollow grouting anchor body 1 is threadedly connected with a sleeve 2 via a first threaded connection portion 3, the upper end of the hollow grouting anchor body 1 is threadedly connected with a grout stopper 4, a gasket 5 is welded to the upper end of the grout stopper 4, a nut 6 is provided on one side of the gasket 5, and the nut 6 is threadedly connected to the sleeve 2 via the first threaded connection portion 3;

[0047] A threaded rod 7 is provided at the bottom end of the sleeve 2, and a first bevel gear 8 is keyed on the threaded rod 7. A lifting nut 12 is also threadedly connected to the threaded rod 7, and a first spring 13 is fixedly connected to the lifting nut 12. The first spring 13 is sleeved on the outer side of the threaded rod 7, and a bursting disc 14 is fixedly provided at the end of the first spring 13. A positioning ring 15 is welded on the inner wall of the sleeve 2, and a second spring 16 is fixedly installed on the positioning ring 15. A connecting ring 17 is fixedly provided at the end of the second spring 16. The second spring 16 and the connecting ring 17 are both sleeved on the outer sides of the first spring 13, the threaded rod 7 and the lifting nut 12. Two symmetrical The overflow hole 18, the bursting piece 14 is at the upper end of the overflow hole 18, the connecting ring 17 is also at the upper end of the overflow hole 18, the thickness of the bursting piece 14 is greater than the diameter of the overflow hole 18. On the one hand, the present invention arranges pressure devices of different stages of the bursting piece 14 on the overflow hole 18 of the conventional grouting anchor rod, and the bursting pressure of the bursting piece 14 is easy to adjust and set, so as to realize grouting of different pressures; on the other hand, a sleeve 2 is added inside the conventional grouting anchor rod, the sleeve 2 not only plays the role of fixing the bursting piece 14, but also can be taken out in time at the end of grouting to prevent the slurry from solidifying in the anchor rod, and when multiple grouting is required later, it is only necessary to reinstall the sleeve 2, and after the grouting is finally completed, the sleeve 2 does not need to be taken out, thereby enhancing the tensile and shear resistance of the anchor rod body.

[0048] In this embodiment, the bottom end of the sleeve 2 is threadedly connected to the limiting ring 19 through the first threaded connection part 3, and the bottom end of the hollow grouting anchor body 1 is fitted and connected with the upper end of the limiting ring 19. The setting of the limiting ring 19 facilitates the support and fixation of the hollow grouting anchor body 1 to maintain stability. The bottom end of the sleeve 2 is threadedly connected to the feeding mechanism 20 through the first threaded connection part 3. The feeding mechanism 20 includes a second threaded connection part 21 and an anchor head 22. The anchor head 22 is configured to be conical. The setting of the feeding mechanism 20 can realize the installation of the grouting anchor into the drilled hole, and the second threaded connection part 21 is connected to the anchor head 22. The threaded connection part 21 is convenient for disassembly and assembly, and the anchor head 22 is convenient for insertion. An adjustment hole 9 is opened on one side of the bottom end of the sleeve 2, and an adjustment screw 10 is movably arranged inside the adjustment hole 9. One end of the adjustment screw 10 is provided with a hexagonal screw hole. The adjustment hole 9 is convenient for the adjustment screw 10 to rotate, and the adjustment screw 10 is convenient for rotating the first bevel gear 8, and the setting of the hexagonal screw hole is convenient for adjustment. One end of the adjustment screw 10 in the sleeve 2 is key-connected with a second bevel gear 11, and the second bevel gear 11 is meshingly connected with the first bevel gear 8.

[0049] In the present application document, the meshing connection between the second bevel gear 11 and the first bevel gear 8 facilitates the rotation adjustment of the threaded rod 7 and the pressure adjustment of the first spring 13. A bearing seat 26 is fixedly installed at the inner bottom end of the sleeve 2, and the bottom end of the threaded rod 7 is movably connected to the inside of the bearing seat 26. The setting of the bearing seat 26 can enable the threaded rod 7 to maintain a stable balance when rotating and adjusting. The top end of the threaded rod 7 is fixedly connected to a limiting plate 25. The height of the limiting plate 25 is lower than the position of the overflow hole 18. The diameter of the limiting plate 25 is smaller than the diameter of the first spring 13. The setting of the limiting plate 25 can effectively prevent the lifting nut 12 from falling off when the lifting and lowering adjustment is performed, and the diameter of the limiting plate 25 is smaller than The diameter of the first spring 13 will not hinder the pressure adjustment of the first spring 13. Slide grooves 23 are provided on both sides of the inner wall of the sleeve 2. Slide blocks 24 are provided on both sides of the bursting piece 14. The slide blocks 24 on both sides slide inside the slide grooves 23 on both sides. The setting of the slide grooves 23 and the slide blocks 24 can enable the bursting piece 14 to move stably during pressure adjustment to prevent rotation and damage to the equipment. The length of the slide groove 23 is 10 cm at the upper and lower ends of the overflow hole 18. The slide grooves 23 and the slide blocks 24 are both provided with rubber layers. A sealing rubber pad is fixedly connected to the bursting piece 14. The length of the slide groove 23 can enable the bursting piece 14 to move under force adjustment, and the setting of the sealing rubber pad and the rubber layer can effectively prevent leakage and fail to achieve pressure adjustment.

[0050] In the specific settings, the following usage is also included:

[0051] S1. First, use an anchoring agent to fix the grouting anchor rod equipped with the bursting disc 14 and the sleeve 2 in the drill hole, and install the grouting plug 4;

[0052] S2, turn on the grouting pump, set the grouting pressure to be slightly greater than the bursting pressure of the bursting disc 14 in the anchor rod under the pressure of the first spring 13, and first perform low-pressure grouting;

[0053] S3. When the slurry cannot be injected, the grouting pressure is increased to a pressure slightly greater than the bursting pressure of the bursting disc 14 in the anchor rod under the first spring 13 and the second spring 16, and grouting is performed at a higher pressure;

[0054] S4, continue to increase the grouting pressure until the grouting pressure is set to a bursting disc 14 slightly greater than the maximum blasting pressure, and stop grouting when the slurry cannot be injected or the designed maximum pressure grouting time is reached;

[0055] S5. If subsequent grouting operation is required, the sleeve 2 of the anchor rod is taken out after the grouting is completed, and a solid iron rod of the same size as the sleeve 2 is inserted to prevent deformation of the grouting anchor rod. When multiple grouting operations are required, the iron rod is taken out and the sleeve 2 of the anchor rod is put back in and can be used again.

[0056] The above method can make the grouting anchor rod easy to install and use, effectively implement the explanation of the use method of the grouting anchor rod, and facilitate the use and operation.

[0057] Specifically, the working principle of the pressure gradient multiple grouting anchor is as follows: when in use, first use the anchoring agent to fix the grouting anchor with the bursting disc 14 and the sleeve 2 in the drilled hole, and install the grouting plug 4; turn on the grouting pump, set the grouting pressure to be slightly greater than the bursting pressure of the bursting disc 14 in the anchor under the pressure of the first spring 13, and first perform low-pressure grouting; when the slurry cannot be injected, increase the grouting pressure to be slightly greater than the bursting pressure of the bursting disc 14 in the anchor under the first spring 13 and the second spring 16, and perform higher-pressure grouting; continue to increase the grouting pressure until the grouting pressure is set to a bursting disc 14 slightly greater than the maximum bursting pressure, and stop grouting when the slurry cannot be injected or reaches the designed maximum pressure grouting time; if subsequent grouting operations are required, inject After the grouting is completed, the sleeve 2 of the anchor rod is taken out, and a solid iron rod of the same size as the sleeve 2 is inserted to prevent the deformation of the grouting anchor rod. When multiple grouting is required, the iron rod is taken out and the sleeve 2 of the anchor rod is reinserted for reuse. On the one hand, pressure devices of different stages of the bursting disc 14 are arranged on the overflow hole 18 of the conventional grouting anchor rod, and the bursting pressure of the bursting disc 14 is easy to adjust and set, so as to realize grouting of different pressures. On the other hand, a sleeve 2 is added inside the conventional grouting anchor rod, and the sleeve 2 not only plays the role of fixing the bursting disc 14, but also can be taken out in time after the grouting is completed to prevent the slurry from solidifying in the anchor rod. When multiple grouting is required subsequently, it is only necessary to reinstall the sleeve 2. After the grouting is finally completed, the sleeve 2 does not need to be taken out, thereby enhancing the tensile and shear resistance of the anchor rod body.

[0058] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0059] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A pressure gradient multiple grouting anchor, characterized in that: It comprises a hollow grouting anchor body (1); The interior of the hollow grouting anchor body (1) is threadedly connected to a sleeve (2) via a first threaded connection portion (3); the upper end of the hollow grouting anchor body (1) is threadedly connected to a grout stopper (4); a gasket (5) is welded to the upper end of the grout stopper (4); a nut (6) is provided on one side of the gasket (5); and the nut (6) is threadedly connected to the sleeve (2) via the first threaded connection portion (3); A threaded rod (7) is provided at the bottom end of the sleeve (2), a first bevel gear (8) is keyed to the threaded rod (7), a lifting nut (12) is threadedly connected to the threaded rod (7), a first spring (13) is fixedly connected to the lifting nut (12), the first spring (13) is sleeved on the outside of the threaded rod (7), a bursting disc (14) is fixedly provided at the end of the first spring (13), a positioning ring (15) is welded to the inner wall of the sleeve (2), a second spring (16) is fixedly mounted on the positioning ring (15), and the second spring (16) is fixedly mounted on the positioning ring (15). A connecting ring (17) is fixedly provided at the end of the second spring (16); the second spring (16) and the connecting ring (17) are both sleeved on the outside of the first spring (13), the threaded rod (7) and the lifting nut (12); two symmetrical overflow holes (18) are provided on the sleeve (2) and the hollow grouting anchor body (1); the bursting disc (14) is located at the upper end of the overflow hole (18); the connecting ring (17) is also located at the upper end of the overflow hole (18); and the thickness of the bursting disc (14) is greater than the diameter of the overflow hole (18).

2. A pressure gradient multiple grouting anchor according to claim 1, characterized in that: The bottom end of the sleeve (2) is threadedly connected to a limit ring (19) via a first threaded connection portion (3), and the bottom end of the hollow grouting anchor body (1) is fittedly connected to the upper end of the limit ring (19).

3. The pressure gradient multiple grouting anchor according to claim 1, characterized in that: The bottom end of the sleeve (2) is threadedly connected to a feeding mechanism (20) via a first threaded connection portion (3); the feeding mechanism (20) comprises a second threaded connection portion (21) and an anchor head (22); the anchor head (22) is configured to be conical.

4. The pressure gradient multiple grouting anchor according to claim 1, characterized in that: An adjustment hole (9) is provided at one side of the bottom end of the sleeve (2), an adjustment screw (10) is movably provided inside the adjustment hole (9), and one end of the adjustment screw (10) is provided with a hexagonal screw hole.

5. A pressure gradient multiple grouting anchor according to claim 4, characterized in that: One end of the adjusting screw (10) located in the sleeve (2) is key-connected to a second bevel gear (11), and the second bevel gear (11) is meshingly connected to the first bevel gear (8).

6. The pressure gradient multiple grouting anchor according to claim 1, characterized in that: A bearing seat (26) is fixedly mounted on the inner bottom end of the sleeve (2), and the bottom end of the threaded rod (7) is movably connected to the inside of the bearing seat (26).

7. The pressure gradient multiple grouting anchor according to claim 1, characterized in that: The top end of the threaded rod (7) is fixedly connected to a limiting plate (25), the height of the limiting plate (25) is lower than the position of the overflow hole (18), and the diameter of the limiting plate (25) is smaller than the diameter of the first spring (13).

8. The pressure gradient multiple grouting anchor according to claim 1, characterized in that: Slide grooves (23) are provided on both sides of the inner wall of the sleeve (2), and slide blocks (24) are provided on both sides of the bursting disc (14). The slide blocks (24) on both sides slide inside the slide grooves (23) on both sides.

9. A pressure gradient multiple grouting anchor according to claim 8, characterized in that: The length of the slide groove (23) is 10 cm at each of the upper and lower ends of the overflow hole (18); a rubber layer is provided on the slide groove (23) and the sliding block (24); and a sealing rubber pad is fixedly connected to the bursting disc (14).

10. The pressure gradient multiple grouting anchor according to claim 1, characterized in that: Also includes the following usage: S1. First, use an anchoring agent to fix the grouting anchor rod equipped with a bursting disc (14) and a sleeve (2) in the drill hole, and install a grouting stopper (4); S2, turning on the grouting pump, setting the grouting pressure to be slightly greater than the bursting pressure of the bursting disc (14) in the anchor rod under the pressure of the first spring (13), and first performing low-pressure grouting; S3. When the grout cannot be injected, the grouting pressure is increased to a value slightly greater than the bursting pressure of the bursting disc (14) in the anchor rod under the first spring (13) and the second spring (16), and grouting is performed at a higher pressure; S4, continue to increase the grouting pressure until the grouting pressure is set to a bursting disc (14) slightly greater than the maximum blasting pressure, and stop grouting when the slurry cannot be injected or the designed maximum pressure grouting time is reached; S5. If subsequent grouting operations are required, the sleeve (2) of the anchor rod is removed after the grouting is completed, and a solid iron rod of the same size as the sleeve (2) is inserted to prevent deformation of the grouting anchor rod. If multiple grouting operations are required, the iron rod is removed and re-inserted into the sleeve (2) of the anchor rod for reuse.

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