Grouting anchor rod and anchor grouting method

Abstract

The present application provides a grouting anchor rod and an anchor grouting method. The structure of the hollow anchor rod is not changed. By setting a movable grouting plug, the movable grouting plug is pushed from the broken rock layer to the intact rock layer under the action of the slurry pressure, and stops moving under the resistance of the intact rock layer, thereby completing the grouting of the broken rock layer. Subsequently, grouting is performed at the bottom end of the anchor hole to complete the grouting of the complete rock layer and realize grouting of separate rock layers. And when grouting the complete rock layer, the movable grouting plug is pushed toward the broken rock layer to compress the slurry at the broken rock layer, thereby realizing secondary pressurization to fill deep cracks. Furthermore, a slurry separation device is provided, and the slurry separation device is closed to prevent the slurry from flowing back into the hollow anchor rod.

Description

Technical Field

[0001] The present application relates to the technical field of construction engineering, and in particular to a grouting anchor rod and an anchoring grouting method. Background Art

[0002] In the related art, the grouting anchor used for segmented grouting requires the hollow anchor structure to be modified in advance. The modified anchor structure is fixed and cannot flexibly respond to the differences in rock distribution during construction. When the grouting body passes through rock layers with different degrees of fragmentation, grouting in different rock layers cannot be achieved. The secondary grouting process requires the use of high-pressure slurry to destroy the primary grouting body to achieve the purpose of secondary grouting. In this process, the secondary damage of the high-pressure slurry to the broken rock mass cannot be avoided, and the resulting decrease in anchoring force is difficult to assess. At the same time, during the traditional grouting process and after the grouting is completed, it is impossible to avoid the slurry outside the anchor rod from flowing back into the hollow anchor rod, causing the slurry outlet to be blocked and the grouting body to shrink, which not only causes construction difficulties, but also forms a gap at the interface between the grouting body and the rock and soil body, causing groundwater and corrosive substances in the external environment to easily contact the anchor rod body, corrode the anchor rod body, and pose a hidden danger to the long-term stability of the anchoring structure. Summary of the Invention

[0003] In view of this, the purpose of this application is to propose a grouting anchor rod and an anchor grouting method.

[0004] Based on the above objectives, the present application provides a grouting anchor rod, comprising:

[0005] Hollow anchor rod, fixed slurry stop plug, movable slurry stop plug and slurry stop plug connection assembly;

[0006] The fixed slurry stop plug and the movable slurry stop plug are respectively sleeved on the outer wall of the hollow anchor rod; the slurry stop plug connection assembly is used to connect the fixed slurry stop plug and the movable slurry stop plug; the fixed slurry stop plug is fixedly connected to the hollow anchor rod, and the movable slurry stop plug can move along the hollow anchor rod;

[0007] The hollow anchor rod is provided with a slurry outlet hole in the part between the fixed slurry stop plug and the movable slurry stop plug; a slurry separator is provided on the side of the hollow anchor rod that is closer to the movable slurry stop plug than the fixed slurry stop plug; the slurry separator is used to allow the slurry inside the hollow anchor rod to flow out through the slurry separator when it is opened, and to prevent the slurry inside the hollow anchor rod from flowing out when it is closed.

[0008] The present application also provides an anchor grouting method, which is implemented by the above-mentioned grouting anchor rod, comprising:

[0009] Place the grouting anchor rod into the anchor hole;

[0010] Injecting slurry into the hollow anchor rod so that the slurry passes through the slurry outlet hole between the fixed slurry stop plug and the movable slurry stop plug, flows into the first grouting area between the fixed slurry stop plug and the movable slurry stop plug, and pushes the movable slurry stop plug away from the fixed slurry stop plug;

[0011] The slurry separator is turned on to allow the slurry to flow through the slurry separator into the second grouting area between the movable slurry stop plug and the bottom of the anchor hole, and to push the movable slurry stop plug close to the fixed slurry stop plug;

[0012] Close the grouting device to prevent the slurry in the second grouting area from flowing back into the hollow anchor rod.

[0013] As can be seen from the above, the grouting anchor rod and anchor grouting method provided by the present application do not change the structure of the hollow anchor rod. By setting a movable grouting plug, the movable grouting plug is pushed from the broken rock layer to the intact rock layer under the action of the slurry pressure, and stops moving under the resistance of the intact rock layer, thereby completing the grouting of the broken rock layer. Subsequently, grouting is performed at the bottom end of the anchor hole to complete the grouting of the complete rock layer and realize grouting of separate rock layers. And when grouting the complete rock layer, the movable grouting plug is pushed toward the broken rock layer to compress the slurry at the broken rock layer, thereby realizing secondary pressurization to fill deep cracks. Furthermore, a slurry separation device is provided to prevent the slurry from flowing back into the hollow anchor rod by closing the slurry separation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in this application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are merely embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 This is a structural schematic diagram of a grouting anchor rod placed in an anchor hole according to an embodiment of the present application.

[0016] Figure 2 This is a three-dimensional schematic diagram of a pulp separation device according to an embodiment of the present application.

[0017] Figure 3 This is a schematic cross-sectional view of a pulp separation device according to an embodiment of the present application.

[0018] The reference numerals in the figure include: pad 1, hollow anchor rod 2, broken rock layer 3, intact rock layer 4, rock crack 5, strain sensor 6, anchor hole 7, slurry outlet hole 8, slurry distribution device 9, fixed slurry stop plug 10, second spring 11, movable slurry stop plug 12, slurry distribution hole 91, fixed shaft 92, first spring 93, one-way valve 94, and limit ring 95. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0020] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which the present application belongs. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0021] Anchoring technology is a core component of commonly used support methods in slope engineering. Through the anchoring force between the anchor rod and the surrounding grouting body, as well as the mutual bonding between the grouting body and the surrounding rock and soil, the rock and soil are effectively connected to improve the integrity of the rock and soil and control the deformation of the stratum. In traditional hollow grouting anchor rods, slurry usually overflows from the front end of the grouting pipe and invades the cracks in the surrounding rock mass. It plays an anchoring role by filling the rock cracks and bonding the surrounding soil. However, due to the single slurry outlet of this process, it is easy to cause less slurry in areas far from the front slurry outlet, uneven distribution of slurry around the anchor rod, and poor crack filling effect, which ultimately leads to defects and voids in the grouting body and insufficient bonding with the surrounding rock and soil, which greatly reduces the anchoring effect and increases the possibility of disasters such as landslides.

[0022] Currently, secondary grouting and segmented grouting techniques are commonly used in engineering projects to address issues such as insufficient grouting and uneven grouting in the first injection. However, segmented grouting requires pre-installation of the hollow anchor structure, which is fixed and cannot flexibly adapt to variations in rock strata distribution during construction. Furthermore, when the grouting material passes through rock strata with varying degrees of fragmentation, grouting cannot be performed in separate rock strata. Secondary grouting, on the other hand, requires the use of high-pressure grouting to destroy the primary grouting material to achieve secondary grouting. This process inevitably damages the fractured rock mass, making the resulting reduction in anchoring force difficult to assess.

[0023] Based on the above-mentioned defects of the related art, the embodiments of the present application provide a grouting anchor rod and an anchor grouting method.

[0024] The grouting anchor rod and anchor grouting method provided in the present application do not change the structure of the hollow anchor rod. By setting a movable grouting plug, the movable grouting plug is pushed from the broken rock layer to the intact rock layer under the action of the slurry pressure, and stops moving under the resistance of the intact rock layer, thereby completing the grouting of the broken rock layer. Subsequently, grouting is performed at the bottom end of the anchor hole to complete the grouting of the complete rock layer and realize grouting of separate rock layers. And when grouting the complete rock layer, the movable grouting plug is pushed toward the broken rock layer to compress the slurry at the broken rock layer, thereby realizing secondary pressurization to fill deep cracks. Furthermore, a slurry separation device is provided, and the slurry separation device is closed to prevent the slurry from flowing back into the hollow anchor rod.

[0025] Figure 1The structure formed when the grouting anchor provided by the embodiment of the present application is placed in the anchor hole is shown.

[0026] like Figure 1 As shown, the embodiment of the present application provides a grouting anchor rod, comprising:

[0027] Hollow anchor rod, fixed slurry stop plug, movable slurry stop plug and slurry stop plug connection assembly.

[0028] The fixed grouting plug and the movable grouting plug are respectively sleeved on the outer wall of the hollow anchor rod. The grouting plug connection assembly is used to connect the fixed grouting plug and the movable grouting plug. The fixed grouting plug is fixedly connected to the hollow anchor rod, while the movable grouting plug can move along the hollow anchor rod. As an optional embodiment, the fixed grouting plug and the movable grouting plug have the same outer diameter. This allows the fixed grouting plug and the movable grouting plug to be placed together in an anchor hole with the same diameter and outer diameter, ensuring the sealing of the fixed grouting plug and the movable grouting plug, preventing slurry from flowing out of the fixed grouting plug or the movable grouting plug.

[0029] The hollow anchor has a slurry outlet located between the fixed and movable stop plugs. A slurry separator is located on the side of the hollow anchor closer to the movable stop plug than the fixed stop plug. This separator allows the slurry inside the hollow anchor to flow out when opened, and prevents it from flowing out when closed.

[0030] In this embodiment, the slurry is caused to flow out from the inside of the hollow anchor rod through the slurry holes and flow into the anchor hole between the fixed slurry stop plug and the movable slurry stop plug. This area is the first grouting area, that is, the broken rock layer area. The number of slurry holes can be two, and the embodiment of the present application does not limit the number of slurry holes. In order to ensure uniform slurry discharge, the slurry holes can be evenly distributed along the circumference. As an optional embodiment, the number of slurry holes is adapted to the size of the hollow anchor rod. Hollow anchor rods have different sizes. When the size of the hollow anchor rod increases, the number of slurry holes also increases accordingly to prevent a low slurry flow rate due to fewer slurry holes, thereby preventing uneven slurry filling.

[0031] The grouting device has two states: open and closed. When the grouting device is open, the slurry inside the hollow anchor rod can flow out of the hollow anchor rod and into the anchor hole between the movable grouting plug and the bottom of the anchor hole. This area is the second grouting area, that is, the intact rock formation area. When the grouting device is closed, the slurry inside the hollow anchor rod cannot flow out of the grouting device. The number of grouting devices can be three, and the embodiment of the application does not limit the number of grouting devices.

[0032] When using the grouting anchor rod, the following method can be adopted: before grouting, the grouting device is in the closed state. Low-pressure slurry is injected into the hollow anchor rod, and the slurry flows into the first grouting area through the slurry outlet, and pushes the movable grouting plug away from the fixed grouting plug. When the movable grouting plug moves to the intact rock formation, the friction of the intact rock formation stops the movable grouting plug, and the grouting of the first grouting area is completed. Subsequently, the pressure of the injected slurry is increased, and the grouting device is turned on. The slurry flows into the second grouting area through the grouting device, and the grouting of the second grouting area is completed. At the same time, the slurry flowing into the second grouting area pushes the movable grouting plug close to the fixed grouting plug under the action of the pressure difference, and the slurry in the first grouting area is pressurized for the second time. Finally, the slurry injection is stopped, and the grouting device is closed to prevent the slurry in the second grouting area from flowing back into the hollow anchor rod through the grouting device.

[0033] This hollow anchor achieves grouting in separate rock layers and provides secondary pressurization of the slurry in the broken rock layer, allowing the slurry to continue to flow deeper into the fractured rock layer, filling these deep fractures, expanding the anchoring range, and better strengthening the connection between the grouting body and the broken rock mass. It also solves the problem of slurry backflow outside the hollow anchor at the end of grouting.

[0034] Figure 2 The three-dimensional structure of the pulp separation device according to the embodiment of the present application is shown. Figure 3 The cross-sectional structure of the pulp separation device according to the embodiment of the present application is shown.

[0035] refer to Figure 2 and Figure 3 As an optional embodiment, the slurry separation device includes a slurry separation hole, a one-way valve, a first spring, a limiting ring and a fixed shaft.

[0036] The one-way valve is arranged in the slurry separation hole. The two ends of the first spring are respectively connected to the one-way valve and the fixed shaft. The limiting ring is fixed to the inner wall of the hollow anchor rod. The fixed shaft is fixedly connected to the inner wall of the hollow anchor rod.

[0037] When the slurry separation device is closed, the one-way valve abuts the limiting ring, and the slurry inside the hollow anchor cannot flow out. When the slurry separation device is opened, the one-way valve moves away from the limiting ring, and the slurry inside the hollow anchor flows out through the slurry separation hole.

[0038] In this embodiment, the one-way valve can be hinged inside the slurry separation hole, and the first spring is always in an extended state, continuously applying tension to the one-way valve. When the pressure of the slurry inside the hollow anchor is less than the tension of the first spring, the one-way valve abuts against the limit ring under the action of the tension and closes the slurry separation hole, preventing the slurry from flowing out of the slurry separation hole. At this time, the slurry separation device is in a closed state; when the pressure of the slurry inside the hollow anchor is greater than the tension of the first spring, the slurry pushes the one-way valve to rotate, the one-way valve moves away from the limit ring, and the slurry separation hole is connected to the central control part of the hollow anchor, thereby allowing the slurry to flow out of the slurry separation hole. At this time, the slurry separation device is in an open state; when the slurry injection is stopped, as the slurry inside the hollow anchor flows out, the slurry pressure drops from greater than the tension of the first spring to less than the tension of the first spring, and the one-way valve rotates under the tension of the first spring, thereby abutting against the limit ring, causing the slurry separation device to switch from the open state to the closed state.

[0039] The number of slurry distribution holes can be four, and the embodiment of the present application does not limit the number of slurry distribution holes. In order to ensure uniform slurry discharge, the slurry distribution holes can be evenly distributed along the circumference. As an optional embodiment, the number of slurry distribution holes is adapted to the size of the hollow anchor rod. Hollow anchor rods have different sizes. When the size of the hollow anchor rod increases, the number of slurry distribution holes also increases accordingly, preventing a low slurry flow rate caused by fewer slurry distribution holes, thereby preventing uneven slurry filling.

[0040] In this way, by providing a one-way valve and a first spring, the slurry separation device is closed when the slurry pressure is lower than the spring tension. At this time, the slurry can only flow out of the slurry outlet hole to the first grouting area. The slurry separation device is automatically opened when the slurry pressure increases. At this time, the slurry flows out of the slurry separation device to the second grouting area, achieving stratum-specific grouting. After the injection of slurry into the hollow anchor rod is stopped, as the slurry flows out of the hollow anchor rod, the slurry pressure drops, causing the slurry separation device to switch from the open state to the closed state, blocking the communication between the hollow anchor rod and the anchor hole, and preventing the slurry from flowing back into the hollow anchor rod from the anchor hole.

[0041] Returning to the grouting anchor provided in the embodiment, in this embodiment, a stopper plug connection assembly connects the fixed stopper plug and the movable stopper plug, determines the initial position of the movable stopper plug, and prevents the movable stopper plug from falling off the hollow anchor bolt. Considering that the movable stopper plug will move relative to the fixed stopper plug during subsequent grouting, the stopper plug connection assembly needs to be able to expand and contract with the movement of the movable stopper plug.

[0042] As an optional embodiment, the movable stop plug limiting device includes a second spring. Two ends of the second spring are respectively connected to the fixed stop plug and the movable stop plug.

[0043] In this way, the fixed stop plug and the movable stop plug are connected by the spring, which determines the initial position of the movable stop plug and prevents the movable stop plug from falling off the hollow anchor rod. During grouting, the spring contracts as the movable stop plug moves, ensuring smooth movement of the movable stop plug.

[0044] As another optional embodiment, the movable stop plug limiting device includes a water-absorbing expansion column. The two ends of the water-absorbing expansion column are respectively connected to the fixed stop plug and the movable stop plug. The water-absorbing expansion column is made of water-absorbing expansion rubber.

[0045] In this way, the fixed grouting plug and the movable grouting plug are connected by the water-absorbing expansion column, which determines the initial position of the movable grouting plug and prevents the movable grouting plug from falling off the hollow anchor rod. During grouting, the water-absorbing expansion column absorbs water from the slurry and expands, so that the movable grouting plug remains connected to the fixed grouting plug during movement, thus ensuring smooth movement of the movable grouting plug.

[0046] Considering that the pressure during grouting in the second grouting area is calculated based on the slurry pressure in the first grouting area, the effect of secondary pressurization of the slurry in the first grouting area is better. The slurry pressure in the first grouting area needs to be measured.

[0047] As an optional embodiment, the grouting anchor further includes a strain sensor, which is fixedly connected to a side of the fixed grouting plug away from the movable grouting plug.

[0048] In this embodiment, the strain sensor may be a strain gauge, and the embodiment of the present application does not limit the selection of the strain sensor.

[0049] In this way, the deformation of the fixed grouting plug is measured by the strain sensor, thereby calculating the pressure of the slurry in the first grouting area, and then calculating the pressure when grouting in the second grouting area.

[0050] Considering that when the grouting anchor rod is placed in the anchor hole, the grouting anchor rod needs to be limited to prevent the slurry injection port of the grouting anchor rod from entering the anchor hole.

[0051] As an optional embodiment, the grouting anchor rod further comprises a pad. The pad is sleeved on the outer wall of the hollow anchor rod at a side of the fixed grouting plug away from the movable grouting plug.

[0052] In this way, the grouting anchor rod is limited by a pad whose size is larger than the hole diameter of the anchor hole, so as to prevent the slurry injection port of the grouting anchor rod from entering the anchor hole and ensure smooth grouting.

[0053] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments, the present disclosure further provides an anchor grouting method, which is implemented by the above-mentioned grouting anchor rod, comprising:

[0054] Place the grouting anchor rod into the anchor hole.

[0055] Inject slurry into the hollow anchor rod so that the slurry passes through the slurry outlet hole between the fixed slurry stop plug and the movable slurry stop plug, flows into the first grouting area between the fixed slurry stop plug and the movable slurry stop plug, and pushes the movable slurry stop plug away from the fixed slurry stop plug to complete grouting in the first grouting area.

[0056] In this embodiment, the pressure of the injected slurry at this time is less than the tension of the first spring of the slurry separation device, so the slurry separation device is in a closed state at this time, and the slurry can only flow out through the slurry outlet hole.

[0057] Open the slurry separation device to allow the slurry to flow through the slurry separation device into the second grouting area between the movable grouting plug and the bottom of the anchor hole, and push the movable grouting plug close to the fixed grouting plug to complete the grouting of the second grouting area and pressurize the slurry in the first grouting area for the second time.

[0058] As an optional embodiment, opening the slurry separation device includes: increasing the injection pressure of the slurry to a first pressure, so that the slurry pushes a one-way valve of the slurry separation device to open the slurry separation device.

[0059] In this way, the slurry separation device is automatically opened by increasing the injection pressure of the slurry.

[0060] As an optional embodiment, before increasing the slurry injection pressure to the first pressure, the anchor grouting method further includes: measuring the strain of the fixed grout stopper using a strain sensor; obtaining a second pressure of the slurry in the first grouting zone based on the strain; and calculating the first pressure based on the second pressure.

[0061] In this way, the injection slurry pressure during grouting in the second grouting area is obtained based on the pressure in the first grouting area, thereby improving the effect of secondary pressurization of the first grouting area.

[0062] Close the grouting device to prevent the slurry in the second grouting area from flowing back into the hollow anchor rod.

[0063] In this way, the blockage of the hollow anchor rod and the shrinkage of the grouting body caused by the backflow of slurry are prevented, which increases the difficulty of construction, easily forms cavities at the contact surface between the grouting body and the rock and soil, and easily corrodes the anchor rod body.

[0064] As an optional embodiment, closing the pulp separation device includes:

[0065] The first spring of the slurry separation device drives the one-way valve to abut against the limiting ring, closing the slurry separation device.

[0066] In this embodiment, after slurry injection stops, the slurry pressure within the hollow anchor decreases as the slurry flows into the second grouting area. When the slurry pressure is less than the tension of the first spring on the one-way valve, the first spring pulls the one-way valve against the stop ring, blocking the connection between the interior of the hollow anchor and the slurry distribution hole, and automatically closing the slurry distribution device.

[0067] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. Within the scope of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0068] While the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0069] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of this application.

Claims

1. A grouting anchor, characterized in that: include: Hollow anchor rod, fixed slurry stop plug, movable slurry stop plug and slurry stop plug connection assembly; The fixed slurry stopper and the movable slurry stopper are respectively sleeved on the outer wall of the hollow anchor rod; The slurry stop plug connection assembly is used to connect the fixed slurry stop plug and the movable slurry stop plug; the fixed slurry stop plug is fixedly connected to the hollow anchor rod, and the movable slurry stop plug can move along the hollow anchor rod; The hollow anchor rod is provided with a slurry outlet hole in the part between the fixed slurry stop plug and the movable slurry stop plug; a slurry separator is provided on the side of the hollow anchor rod that is closer to the movable slurry stop plug than the fixed slurry stop plug; the slurry separator is used to allow the slurry inside the hollow anchor rod to flow out through the slurry separator when it is opened, and to prevent the slurry inside the hollow anchor rod from flowing out when it is closed.

2. The grouting anchor rod according to claim 1, characterized in that: The pulp separation device comprises: a slurry separation hole, a one-way valve, a first spring, a limiting ring and a fixed shaft; The one-way valve is arranged in the pulp separation hole; the two ends of the first spring are respectively connected to the one-way valve and the fixed shaft; the limiting ring is fixed to the inner wall of the hollow anchor rod; the fixed shaft is fixedly connected to the inner wall of the hollow anchor rod; When the slurry separation device is closed, the one-way valve abuts the limiting ring, and the slurry inside the hollow anchor cannot flow out; when the slurry separation device is opened, the one-way valve moves away from the limiting ring, and the slurry inside the hollow anchor flows out through the slurry separation hole.

3. The grouting anchor rod according to claim 1, characterized in that: Also included are strain sensors; The strain sensor is fixedly connected to a side of the fixed slurry stopper away from the movable slurry stopper.

4. The grouting anchor rod according to claim 1, characterized in that: The movable pulp stopper limiting device includes a second spring; Two ends of the second spring are respectively connected to the fixed slurry stopping plug and the movable slurry stopping plug.

5. The grouting anchor rod according to claim 1, characterized in that: The movable slurry stopper limiting device includes a water-absorbing expansion column; The two ends of the water-absorbing expansion column are respectively connected to the fixed slurry stop plug and the movable slurry stop plug; the material of the water-absorbing expansion column is water-absorbing expansion rubber.

6. The grouting anchor rod according to claim 1, characterized in that: Also includes backing plates; The backing plate is sleeved on the outer wall of the hollow anchor rod on the side of the fixed slurry stop plug away from the movable slurry stop plug.

7. The grouting anchor according to claim 1, characterized in that: The slurry outlet holes are evenly distributed along the circumference.

8. The grouting anchor rod according to claim 2, characterized in that: The slurry separation holes are evenly distributed along the circumference.

9. The grouting anchor rod according to claim 2, characterized in that: The number of the slurry outlet holes and the slurry distribution holes are respectively adapted to the size of the hollow anchor rod.

10. An anchor grouting method, characterized in that: The method is implemented by the grouting anchor according to any one of claims 1 to 9, comprising: Place the grouting anchor rod into the anchor hole; Injecting slurry into the hollow anchor rod so that the slurry passes through the slurry outlet hole between the fixed slurry stop plug and the movable slurry stop plug, flows into the first grouting area between the fixed slurry stop plug and the movable slurry stop plug, and pushes the movable slurry stop plug away from the fixed slurry stop plug; Turning on the slurry separation device to allow the slurry to flow through the slurry separation device into the second grouting area between the movable slurry stop plug and the bottom of the anchor hole, and pushing the movable slurry stop plug close to the fixed slurry stop plug; The slurry separation device is closed to prevent the slurry in the second grouting area from flowing back into the hollow anchor rod.

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