Hollow anchor rod with one-way grouting, liquid stopping and slurry leakage preventing device
By designing a one-way grouting and leakage prevention device at the tail end of the hollow anchor rod, the problems of grout leakage and waste were solved, the grouting quality and construction environment management were improved, and efficient grout utilization was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU A&G ROCKBOLT TECH
- Filing Date
- 2025-06-06
- Publication Date
- 2026-04-17
AI Technical Summary
After grouting is completed, the grout in existing hollow grouting anchor rods is prone to leakage from the grouting port at the tail end, which leads to a decrease in the quality of grouting and anchoring, serious waste of grout, and affects the construction environment.
Design a one-way grouting liquid-stopping and grout-preventing device, including a plug and a hose. The plug is inserted into the grouting port and seals the space between the inner walls of the hollow anchor rod. Grout enters the hose through the grouting hole. The restorative closure structure restores the closure after grouting is completed to prevent grout backflow.
It improves the quality of grouting and anchoring, reduces grout waste, minimizes the impact on the construction environment, and ensures the stability and efficiency of the grouting process.
Smart Images
Figure CN224134673U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of hollow grouting anchor bolt structures, and in particular to a hollow anchor bolt with a one-way grouting liquid-stopping and grout-leakage-preventing device. Background Technology
[0002] In the current use of hollow grouting anchors, it is often necessary to insert the anchor at an upward angle into the soil, meaning the grouting port at the tail end of the anchor faces downwards. Then, a grouting pipe is connected to the tail end of the anchor, and grouting is performed using the grouting port at the tail end. After grouting is completed, the grouting pipe is closed, and then it needs to be removed from the tail end of the anchor. Because the grouting port at the tail end of the anchor faces downwards, the interior of the hollow grouting anchor... Grout will leak from the grouting port at the tail end, resulting in incomplete grout filling around the hollow grouting anchor, forming voids or weak areas, significantly reducing the bond strength between the anchor and the soil. Excessive grout loss will prevent the designed anchorage length from being reached, especially in full-length bonded anchors, which may lead to insufficient pull-out resistance. Furthermore, grout leakage will cause some of the injected grout to be lost, requiring re-injection and increasing material costs. If the leakage is severe, it may be necessary to re-drill or install additional anchors, delaying the construction period.
[0003] To address the aforementioned issues, the existing solution is generally to plug the grouting port at the tail end of the hollow grouting anchor rod with a rubber stopper the moment the grouting pipe is pulled out. However, the speed is limited by the operator and the operation is relatively complicated. Consequently, a significant amount of grout still leaks out from the tail grouting port, which still affects the grouting and anchoring quality of the hollow grouting anchor rod and results in grout waste. Furthermore, grout falling to the ground affects the on-site construction environment, thus increasing the difficulty of on-site environmental management. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of the existing technology, which involves blocking the grouting port at the tail end of the hollow grouting anchor rod with a rubber plug at the moment the grouting pipe is pulled out. Due to operator limitations, a large amount of grout leaks out from the tail grouting port, affecting the grouting and anchoring quality of the hollow grouting anchor rod, wasting a lot of grout, and impacting the on-site construction environment. The invention provides a hollow anchor rod with a one-way grouting and leakage prevention device.
[0005] In a first aspect, this utility model provides a hollow anchor bolt with a one-way grouting and leakage prevention device, comprising:
[0006] A hollow anchor bolt body, wherein the hollow anchor bolt body has a hollow channel extending along its axial direction, and the hollow channel has a grouting port at the tail end of the hollow anchor bolt body;
[0007] A one-way grouting and leakage prevention device includes a plug and a hose. The plug has a grouting hole that extends through it along its axial direction. The plug and the hollow anchor rod body can be coaxially arranged. The plug can be inserted into the grouting port and seal the space between the plug and the inner wall of the hollow anchor rod body. One end of the hose near the tail end of the hollow anchor rod body is connected to the grouting hole. The other end of the hose is a restorative closure structure. The restorative closure structure is in a closed state when no grout is passing through, and in an open state when grout is passing through.
[0008] The hollow anchor bolt of this utility model, equipped with a one-way grouting and leakage prevention device, has the device installed inside the grouting port of the hollow anchor bolt body. The plug of the device is inserted into the grouting port and seals the space between the plug and the inner wall of the hollow anchor bolt body. This allows grout to be injected only from the grouting hole of the plug into the end of the hose near the tail end of the hollow anchor bolt body. After the grout flows to the restorative closure structure at the other end of the hose, the restorative closure structure is opened by the grout and enters the hollow channel of the hollow anchor bolt body, achieving grouting. After grouting is completed, grouting is stopped, and the restorative closure structure returns to a closed state. This reduces the backflow of grout from the grouting port, resulting in better grouting and anchoring quality, higher grout utilization, less grout waste, and reduced impact on the on-site construction environment.
[0009] Preferably, the restorative closure structure is a flat structure, and the pipe wall of the flat structure is fitted together. When grout is injected, the flat structure with the pipe wall fitted together is stretched open by the grout, so that grouting can be realized; when grouting stops, the pipe wall of the flat structure returns to the fitted state under the action of elastic force, thus achieving closure.
[0010] Preferably, the restorative closure structure is a rubber or plastic structure with a certain degree of elasticity and hardness, which allows it to return to a closed state after being expanded.
[0011] Preferably, the plug is a rubber plug, the rubber plug has a frustum-shaped structure, the maximum outer diameter of the large end of the frustum-shaped structure is greater than the diameter of the grouting port, the minimum outer diameter of the small end of the frustum-shaped structure is less than or equal to the diameter of the grouting port, and the small end of the frustum-shaped structure is closer to the head end of the hollow anchor rod than the large end of the frustum-shaped structure.
[0012] The plug is a rubber plug with a certain degree of hardness and elasticity, which can provide support while also having a certain degree of deformation capacity. This allows the large end of the frustum-shaped structure to be compressed and pressed tightly against the side wall of the grouting port through radial deformation, thus achieving a seal. It also prevents the rubber plug from shifting further within the hollow channel due to the impact of grouting.
[0013] Preferably, one end of the hose near the tail end of the hollow anchor rod is sleeved on the outer wall of the frustum-shaped structure and pressed between the outer wall of the frustum-shaped structure and the side wall of the grouting port, so that the relative positions of the rubber plug, the hose and the side wall of the grouting port can be basically fixed, avoiding the hose from falling off the outer wall of the frustum-shaped structure due to the grouting impact force.
[0014] Preferably, the axial length of the frustum-shaped structure is 30mm-40mm; while ensuring the anchoring capacity with the inner wall of the hollow anchor rod, the axial length of the plug is reduced to avoid using an excessively long hollow channel temporarily.
[0015] And / or, the diameter of the largest end of the frustum-shaped structure is 1mm-2mm larger than the diameter of the hollow channel of the hollow anchor rod body; to ensure that the frustum-shaped structure can be fully inserted into the hollow channel and to ensure the anchoring ability with the inner wall of the hollow anchor rod body;
[0016] And / or, the cone angle of the frustum-shaped structure is 5°-15°, which makes it easier for the frustum-shaped structure to be inserted into the hollow channel and can maximize the anchoring ability between the plug and the inner wall of the hollow anchor rod.
[0017] Preferably, the restorative closure structure forms a circular tube structure when the grout passes through, and the diameter of the circular tube structure is greater than or equal to the diameter of the grouting hole, which can improve the grouting effect.
[0018] Preferably, the diameter of the grouting hole is not less than 8mm, serving as a grouting channel to ensure grouting efficiency;
[0019] And / or, the axial length of the one-way grouting liquid-stopping and grout-preventing device is 60mm-80mm to avoid using excessively long hollow channels and to ensure the grouting effect of the hollow anchor body.
[0020] Preferably, the outer surface of the hollow anchor body is a smooth structure, and the first end of the hollow anchor body is provided with an end anchoring device; the end anchoring device is used to enhance the anchoring with the rock or soil layer;
[0021] Alternatively, the outer surface of the hollow anchor body may be partially or entirely threaded, with the threads continuously arranged along the axial direction of the hollow anchor body; the threads are used to enhance the anchoring with the rock or soil layers.
[0022] Preferably, the hollow anchor body has several grout leakage holes on its side, which can be used to grout and reinforce the rock or soil layers from the side, thereby enhancing the final anchoring capacity of the anchor.
[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0024] This invention provides a hollow anchor bolt with a one-way grouting and leakage prevention device. The device is installed inside the grouting port of the hollow anchor bolt body. The plug of the device is inserted into the grouting port and seals the space between the plug and the inner wall of the hollow anchor bolt body. This allows grout to be injected only from the grouting hole of the plug into the end of the flexible tube near the tail end of the hollow anchor bolt body. After the grout flows to the restorative closure structure at the other end of the flexible tube, the grout expands the structure and enters the hollow channel of the hollow anchor bolt body, achieving grouting. After grouting is completed, grouting is stopped, and the restorative closure structure returns to a closed state. This reduces grout backflow from the grouting port, resulting in better grouting and anchoring quality, higher grout utilization, less grout waste, and reduced impact on the on-site construction environment. Attached Figure Description
[0025] Figure 1 This is a first-view side view of the hollow anchor rod with a one-way grouting and leakage prevention device described in this utility model.
[0026] Figure 2 This is a second-view side view of the first type of hollow anchor rod with a one-way grouting and leakage prevention device described in this utility model;
[0027] Figure 3 A schematic diagram of a one-way grouting sealing and leakage prevention device;
[0028] Figure 4 This is a side view of the first type of hollow anchor rod with a one-way grouting and leakage prevention device described in this utility model, in its usage state.
[0029] Figure 5 This is a second-view side view of the hollow anchor rod with a one-way grouting and leakage prevention device described in this utility model.
[0030] Figure 6 This is a second-view side view of the hollow anchor rod with a unidirectional grouting and leakage prevention device as described in this utility model.
[0031] The markings in the diagram are: 1. Hollow anchor body; 11. Hollow channel; 12. Thread; 13. Leakage hole; 14. End anchoring device; 2. One-way grouting and leakage prevention device; 21. Plug; 211. Grouting hole; 22. Hose; 221. Restorative closure structure; 3. Grouting pipe; 31. Connector. Detailed Implementation
[0032] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.
[0033] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.
[0034] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.
[0035] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.
[0036] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.
[0037] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.
[0038] Example 1
[0039] like Figures 1-4 As shown, a hollow anchor bolt with a one-way grouting and leakage prevention device includes: a hollow anchor bolt body 1 and a one-way grouting and leakage prevention device 2. The hollow anchor bolt body 1 has a hollow channel 11 extending along its axial direction, and the hollow channel 11 has a grouting port at the tail end of the hollow anchor bolt body 1. Figure 1 As shown, the hollow channel 11 is a cylindrical channel set at the axis of the hollow anchor body 1, with its left end being the tail end and its right end being the head end. The one-way grouting and leakage prevention device 2 is fully inserted into the grouting port at the left end of the hollow channel 11.
[0040] In this embodiment, the hollow anchor rod body 1 is a steel structure.
[0041] In optional implementations, such as Figure 6 As shown, the outer surface of the hollow anchor body 1 is a smooth structure. The first end of the hollow anchor body 1 is provided with an end anchoring device 14. The end anchoring device 14 is used to enhance the anchoring with the rock or soil layer. The end anchoring device 14 can adopt existing anchoring methods, such as the anchoring form of an expansion shell anchor.
[0042] In optional implementations, such as Figure 5 As shown, the outer surface of the hollow anchor body 1 is partially or entirely provided with threads 12, and the threads 12 are continuously arranged along the axial direction of the hollow anchor body 1; the threads 12 are used to enhance the anchoring with the rock or soil layer.
[0043] In optional implementations, such as Figure 5 and Figure 6 As shown, the hollow anchor body 1 has several grout leakage holes 13 on its side, which can be used to grout and reinforce the rock or soil layers from the side, thereby enhancing the final anchoring capacity of the anchor.
[0044] Furthermore, all of the grout leakage holes 13 are evenly arranged along the axial and circumferential directions of the hollow anchor body 1.
[0045] In this embodiment, as Figures 1-4As shown, the one-way grouting and leakage prevention device 2 includes a plug 21 and a hose 22. The plug 21 has a grouting hole 211 extending through it along its axial direction. The plug 21 and the hollow anchor rod body 1 can be coaxially arranged. The plug 21 can be inserted into the grouting port and seal the space between the plug 21 and the inner wall of the hollow anchor rod body 1. The hose 22 is located in the hollow channel 11. One end of the hose 22 near the tail end of the hollow anchor rod body 1 is connected to the grouting hole 211, and the other end of the hose 22 is a restorative closure structure 221. Figure 2 , Figure 5 and Figure 6 As shown, the restorative closure structure 221 is in a closed state when no slurry is flowing through it; as Figure 4 As shown, the restorative closure structure 221 is in the open state when the slurry passes through.
[0046] The restorative closure structure 221, which restores its closed state after being opened, can achieve this function through existing materials or a combination of existing materials and structures. For example, silicone or TPU (thermoplastic polyurethane) can be used. These materials are flexible and can be deformed by designing the pipe wall thickness or internal structure (such as corrugations or pleats). When no grout flows through, the pipe wall naturally collapses and flattens due to elasticity; after grouting, when grout flows through, the grout pressure opens the pipe wall and restores its circular shape; after grouting stops, it elastically retracts to form a closed structure. Alternatively, a composite laminate material can be used. The outer layer of the restorative closure structure 221 uses an elastomer, and the inner layer uses a flexible membrane. The inner layer is thin and flexible, while the outer layer provides resilience. After grouting, when grout flows through, the grout pressure opens the inner layer; after grouting stops, the elasticity of the outer layer flattens the pipe.
[0047] In optional implementations, such as Figure 2 and Figure 3 As shown, the restorative closure structure 221 is a flat structure. The pipe wall of the flat structure is attached. When grout is injected, the flat structure with the pipe wall attached is opened by the grout, so that grouting can be realized. When grouting stops, the pipe wall of the flat structure returns to the attached state under the action of elastic force, thus achieving closure.
[0048] In an optional embodiment, the restorative closure structure 221 is a rubber or plastic structure with a certain degree of elasticity and hardness, which can restore it to a closed state after being stretched open, and has a low cost.
[0049] In optional implementations, such as Figure 3 As shown, the plug 21 is a rubber plug with a frustum-shaped structure. The maximum outer diameter of the large end of the frustum-shaped structure is greater than the diameter of the grouting port, and the minimum outer diameter of the small end of the frustum-shaped structure is less than or equal to the diameter of the grouting port. The small end of the frustum-shaped structure is closer to the head end of the hollow anchor rod 1 than the large end of the frustum-shaped structure. Figure 2 As shown, the plug body 21 is larger at the left end and smaller at the right end. The plug body 21 is a rubber plug with a certain degree of hardness and elasticity, which can provide support while having a certain deformation capacity. This allows the large end of the frustum-shaped structure to be pressed and squeezed against the side wall of the grouting port through radial deformation and compression, thereby achieving a seal and preventing grout leakage during grouting. It also prevents the rubber plug from shifting further within the hollow channel 11 due to the impact of grouting.
[0050] Furthermore, such as Figure 2 and Figure 3 As shown, one end of the flexible hose 22 near the tail end of the hollow anchor body 1 is fitted onto the outer wall of the frustum-shaped structure and pressed between the outer wall of the frustum-shaped structure and the side wall of the grouting port. This ensures that the relative positions of the rubber plug, the flexible hose 22, and the side wall of the grouting port are basically fixed, preventing the flexible hose 22 from detaching from the outer wall of the frustum-shaped structure due to grouting impact, thus ensuring stable use during grouting. Furthermore, the internal space of the end of the flexible hose 22 near the tail end of the hollow anchor body 1 is larger than the internal space of the restorative closure structure 221 after it is opened, making it difficult for the grout already injected into the hollow channel 11 to flow back through the restorative closure structure 221.
[0051] In an optional embodiment, while ensuring the anchoring capacity with the inner wall of the hollow anchor body 1, the axial length of the plug body 21 is reduced to avoid using an excessively long hollow channel 11 temporarily. The axial length of the frustum-shaped structure is 30mm-40mm.
[0052] In an optional embodiment, the frustum-shaped structure is fully inserted into the hollow channel 11 and the anchoring ability with the inner wall of the hollow anchor body 1 is guaranteed; the diameter of the largest end of the frustum-shaped structure is 1mm-2mm larger than the diameter of the hollow channel 11 of the hollow anchor body 1.
[0053] In an optional embodiment, in order to make it easier for the frustum-shaped structure to be inserted into the hollow channel 11 and to maximize the anchoring ability between the plug and the inner wall of the hollow anchor rod body 1, the cone angle of the frustum-shaped structure is 5°-15°.
[0054] In an optional embodiment, the diameter of the grouting hole 211 is not less than 8mm, serving as a grouting channel to ensure grouting efficiency.
[0055] In an optional embodiment, the axial length of the one-way grouting and leakage prevention device 2 is 60mm-80mm to avoid using an excessively long hollow channel 11 and to ensure the grouting effect of the hollow anchor body 1.
[0056] This embodiment provides a specific one-way grouting and leakage prevention device 2. The total axial length of the one-way grouting and leakage prevention device is 70mm, the axial length of the rubber plug is 40mm, the maximum diameter of the rubber plug is 1mm larger than the diameter of the hollow channel 11 of the hollow anchor body 1, the taper angle of the rubber plug is 10 degrees, and the grouting hole diameter of the rubber plug is not less than 8mm, serving as a grouting channel. This structure facilitates the installation of the one-way grouting and leakage prevention device 2 at the grouting port of the hollow anchor body 1 and completely within the hollow channel 11. It has a good anchoring effect, making the grouting process stable, occupying a short length of the hollow channel 11, and having a small impact on the grouting effect of the hollow channel 11. Furthermore, the hose 22 is made of plastic or rubber, resulting in a low overall cost for the one-way grouting and leakage prevention device 2.
[0057] The method of using the hollow anchor bolt with a one-way grouting and leakage prevention device according to this utility model involves placing the one-way grouting and leakage prevention device 2 inside the grouting port of the hollow anchor bolt body 1, such that the plug 21 of the one-way grouting and leakage prevention device 2 is inserted into the grouting port and seals the space between the plug 21 and the inner wall of the hollow anchor bolt body 1, thereby ensuring that the grout can only be injected from the grouting hole 211 of the plug 21 into the end of the hose 22 near the tail end of the hollow anchor bolt body 1; then the hollow anchor bolt... After the hollow anchor body 1 is inserted into the anchor hole and reaches the preset depth, the gap between the hollow anchor body 1 and the anchor hole opening is blocked with a grout stopper or cotton yarn and other conventional liquid-stopping tools. The tail end of the hollow anchor body 1 is connected to the grouting pipe 3 through the connector 31. Grouting begins in the grouting pipe 3. The grout flows through the grouting hole 211 in the middle of the rubber plug to the restorative closure structure 221 at the other end of the hose 22. The restorative closure structure 221 is opened by the grout and enters the hollow channel 11 of the hollow anchor body 1, thus realizing grouting. Figure 4 As shown, at this time, the internal space of the end of the hose 22 near the tail end of the hollow anchor body 1 is larger than the internal space of the restorative closure structure 221 after it is opened. After grouting is completed, grouting is stopped. The restorative closure structure 221 is restored to a closed state under its own elastic rebound and the backflow of grout already injected into the hollow channel 11. After closing, the grout already injected into the hollow channel 11 no longer flows back. This can reduce the backflow of grout from the grouting port, resulting in better grouting and anchoring quality, high grout utilization rate, less grout waste, and reduced impact on the on-site construction environment.
[0058] In an optional embodiment, the restorative closure structure 221 forms a circular tube structure when the grout passes through, and the diameter of the circular tube structure is greater than or equal to the diameter of the grouting hole 211, which can improve the grouting effect. Furthermore, the connector 31 connecting the tail end of the hollow anchor rod 1 to the grouting pipe can be a conventional connection method such as steel wire.
[0059] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A hollow anchor rod with a one-way grouting liquid leakage prevention and grouting device, characterized in that, include: Hollow anchor body (1), the hollow anchor body (1) has a hollow channel (11) that runs through it along its axial direction, the hollow channel (11) has a grouting port at the tail end of the hollow anchor body (1); A one-way grouting and leakage prevention device (2) includes a plug (21) and a hose (22). The plug (21) has a grouting hole (211) that runs through it along its axial direction. The plug (21) and the hollow anchor rod body (1) can be coaxially arranged. The plug (21) can be inserted into the grouting port and seal the space between the plug (21) and the inner wall of the hollow anchor rod body (1). One end of the hose (22) near the tail end of the hollow anchor rod body (1) is connected to the grouting hole (211). The other end of the hose (22) is a restorative closure structure (221). The restorative closure structure (221) is in a closed state when no grout is passing through, and in an open state when grout is passing through.
2. A hollow anchor rod with one-way grouting and liquid leakage prevention device according to claim 1, characterized in that, The restorative closure structure (221) is a flat structure, and the tube wall of the flat structure is attached.
3. A hollow anchor rod with a one-way grouting liquid leakage prevention and grouting device according to claim 2, characterized in that, The restorative closure structure (221) is a rubber structure or a plastic structure.
4. A hollow anchor rod with one-way grouting and liquid leakage prevention device according to claim 1, characterized in that, The plug (21) is a rubber plug, which has a frustum-shaped structure. The maximum outer diameter of the large end of the frustum-shaped structure is greater than the diameter of the grouting port, and the minimum outer diameter of the small end of the frustum-shaped structure is less than or equal to the diameter of the grouting port. The small end of the frustum-shaped structure is closer to the head end of the hollow anchor rod (1) than the large end of the frustum-shaped structure.
5. A hollow anchor rod with a one-way grouting liquid leakage prevention device according to claim 4, characterized in that, One end of the flexible hose (22) near the tail end of the hollow anchor body (1) is sleeved on the outer wall of the frustum-shaped structure and pressed between the outer wall of the frustum-shaped structure and the side wall of the grouting port.
6. A hollow anchor rod with one-way grouting and liquid leakage prevention device according to claim 4, characterized in that, The axial length of the frustum-shaped structure is 30mm-40mm; And / or, the diameter of the largest end of the frustum-shaped structure is 1mm-2mm larger than the diameter of the hollow channel (11) of the hollow anchor body (1); And / or, the cone angle of the frustum-shaped structure is 5°-15°.
7. A hollow anchor rod with one-way grouting and liquid leakage prevention device according to claim 4, characterized in that, The restorative closure structure (221) forms a circular tube structure when the grout passes through, and the diameter of the circular tube structure is greater than or equal to the diameter of the grouting hole (211).
8. A hollow anchor rod with a one-way grouting liquid leakage prevention and grouting device according to claim 1, characterized in that, The diameter of the grouting hole (211) is not less than 8 mm; And / or, the axial length of the one-way grouting liquid-stopping and grout-preventing device (2) is 60mm-80mm.
9. A hollow anchor rod with a one-way grouting and liquid leakage preventing device according to any one of claims 1-8, characterized in that, The outer surface of the hollow anchor rod body (1) is a smooth structure, and the first end of the hollow anchor rod body (1) is provided with an end anchoring device (14); Alternatively, the outer surface of the hollow anchor body (1) may be partially or entirely provided with threads (12), and the threads (12) may be continuously arranged along the axial direction of the hollow anchor body (1).
10. A hollow anchor rod with a one-way grouting and liquid leakage preventing device according to claim 9, characterized in that, The hollow anchor body (1) has several grout leakage holes (13) on its side.