A hollow segmented pressurized grouting system with adjustable grout output and its method

Abstract

This invention relates to the field of tunnel support technology and discloses a hollow segmented pressurized grouting system and method with adjustable grout output. The system includes a cable body adapted to anchor cable holes, with grouting channels inside the cable body. Multiple grouting holes communicating with the grouting channels are sequentially opened on the outer side of the cable body. A plug is installed in the middle of the cable body, which divides the cable body into an inner section and an outer section along the axial direction. The plug can prevent grout from flowing back to the outer section before the grouting operation is completed in the inner section, and allow grout to flow back to the outer section after the grouting operation is completed in the inner section, so as to carry out grouting operation in the outer section. This invention improves the structure, grouting process and support technology of ordinary grouting anchor cables, and realizes the function of anchor cables for grouting reinforcement of surrounding rock. It can not only improve the support effect of the original anchor cables, but also achieve the support effect of multiple support methods mentioned above. Moreover, it does not require the use of grouting anchor rods or additional labor, thus effectively solving the tunnel support problem.

Description

Technical Field

[0001] This invention relates to the field of tunnel support technology, and in particular to an adjustable grout output hollow segmented pressurized grouting system and method thereof. Background Technology

[0002] Mine roadways are various passages drilled between the surface and the ore body, used for ore transportation, personnel movement, ventilation, etc. As an important underground space in coal mines, their stability is essential for the success of underground mining. However, with increasingly complex geological conditions and the continuous increase in the depth and breadth of coal mining, roadway support technology is also constantly evolving, and mine pressure control has become a major challenge restricting mine development.

[0003] To ensure effective support, measures such as increasing support strength, density, and materials are typically employed. Common practices include anchor cable reinforcement, grouting reinforcement, combined anchor support, anchor-anchor combined support, and a combination of long and short anchor cables with grouting, or a combination of multiple measures. While these conventional support methods improve roadway support to some extent, they significantly increase costs and labor requirements. Summary of the Invention

[0004] To address the technical problems mentioned in the background section, this invention provides an adjustable grout discharge hollow segmented pressurized grouting system and method thereof.

[0005] This invention is achieved using the following technical solution: a hollow segmented pressurized grouting system with adjustable grout output, comprising a cable body adapted to anchor cable holes, the cable body having grouting channels, a plurality of grouting holes communicating with the grouting channels being sequentially opened on the outer side of the cable body, a plug being provided in the middle of the cable body, and the plug being used to divide the cable body into an inner section and an outer section in the axial direction of the cable body;

[0006] Each of the grouting holes is covered with a grout-blocking membrane that can temporarily seal its opening. Each grouting hole is fitted with a water-stop strip on both sides of the cable body along the axial direction. An independent grouting interval is formed between every two adjacent water-stop strips. When the water-stop strip comes into contact with the grout, it expands and deforms to make a tight contact with the wall of the anchor cable hole at the corresponding position. When grouting is performed on each grouting interval, the grout in the corresponding grouting hole will break through the corresponding grout-blocking membrane and flow into the grouting interval.

[0007] The initial flow direction of the grout during grouting is specified as follows: from one end of the outer section near the opening of the anchor cable hole to the end of the inner section;

[0008] The plugging device can prevent grout from flowing back to the outer section before the grouting operation is completed in the inner section, and allow grout to flow back to the outer section after the grouting operation is completed in the inner section, so as to carry out grouting operation in the outer section.

[0009] As a further improvement to the above scheme, each of the grouting holes is distributed in a spiral around the cable body along its axial direction.

[0010] As a further improvement to the above scheme, a grout stop plug and a tray are sequentially fitted and fixed at one end of the cable body near the opening of the anchor cable hole.

[0011] As a further improvement to the above solution, the plug has an inlet at one end connected to the outer section and an outlet at the other end connected to the inner section. The inlet of the outlet is connected to the outlet of the inlet. The plug has a base inside, and a valve ball capable of blocking the outlet of the inlet is elastically provided on the side of the base facing the outer section. The plug also has a return channel that directly connects the inner section and the outer section. The plug is equipped with a sealing mechanism, which is used to release the seal on the return channel when the grouting of the inner section is completed.

[0012] As a further improvement to the above solution, the discharge end of the feed inlet has a valve groove that seals with the valve ball.

[0013] As a further improvement to the above solution, a hollow telescopic tube is provided between the valve ball and the base, and a spring is provided inside the telescopic tube. The two ends of the spring are respectively fixed to the valve ball and the base. When the valve ball blocks the discharge end of the feed inlet, the spring is in a compressed deformation state.

[0014] As a further improvement to the above solution, the sealing mechanism includes a plate perpendicular to the axis of the cable body. The plate is slidably inserted into the base. The plate has a first through hole and a second through hole. A one-way valve plate with a flipping direction adapted to the flow direction of the slurry in the return channel is elastically disposed in the second through hole. The plugger is provided with a transmission mechanism. The transmission mechanism is driven by the valve ball to move toward the base, thereby driving the plate to move centrifugally, so that the first through hole is moved into the discharge channel and the second through hole is moved into the return channel.

[0015] As a further improvement to the above scheme, the maximum flip angle of the one-way valve plate is ninety degrees.

[0016] As a further improvement to the above solution, the transmission mechanism includes a pressure-bearing rod concentrically inserted into the telescopic tube. One end of the pressure-bearing rod is fixed to the side wall of the valve ball. A first cylinder concentric with the pressure-bearing rod is rotatably inserted into the base. The other end of the pressure-bearing rod passes through the first cylinder. A spiral-shaped limiting groove is formed on the inner circumference of the first cylinder. A limiting block that slidably engages with the limiting groove is fixed on the outer wall of the pressure-bearing rod. A first conical tooth is fixed to one end of the first cylinder. A second conical tooth that meshes with the first conical tooth is provided in the base. A second cylinder corresponding to the plate is concentrically fixed on the second conical tooth. The second cylinder is rotatably installed in the base. A screw is threaded into one end of the second cylinder. One end of the screw is fixed to the centripetal end of the plate.

[0017] The present invention also provides a hollow segmented pressurized grouting method with adjustable grout output, comprising the following steps:

[0018] S1. Insert the cable into the pre-drilled anchor cable hole;

[0019] S2. Grouting operation with gradually increasing pressure through grouting channel. The grout flows from the outer section to the end of the inner section. Under pressure, the grout breaks through the grouting membrane at each grouting hole in sequence from the end of the inner section to the front of the outer section, so that the grout flows into the surrounding rock fissures in each grouting area in sequence, thereby increasing the strength of the surrounding rock in each grouting area in sequence.

[0020] Each time the grout flows into a grouting area, it will contact the corresponding waterstop strip in that area, causing it to expand and deform to form a sealed space by making a tight contact with the hole wall of the anchor cable hole. After the grouting area is completely grouted, the next grouting area will be grouted.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. This invention improves the structure, grouting process, and support technology of ordinary grouting anchor cables to achieve the effect of grouting reinforcement of surrounding rock by anchor cables. It can not only improve the support effect of the original anchor cables, but also achieve the support effect of the above-mentioned multiple support methods. Moreover, it does not require the use of grouting anchor rods or additional labor, thus effectively solving the problem of roadway support.

[0023] 2. This invention changes the traditional grouting sequence. Segmented grouting allows the grouting process to gradually move from the deep layers of the tunnel to the shallow layers, effectively solving the long-standing engineering problem of shallow tunnels being prone to preferential infiltration and causing shallow grout leakage.

[0024] 3. Compared with conventional grouting anchor cables, the hollow segmented pressurized grouting anchor cable developed in this invention can achieve:

[0025] (1) Shallow sealing of the surrounding rock of the tunnel, and effective grouting in the deep part;

[0026] (2) Change the traditional grouting sequence to solve the problem of easy grout leakage in shallow roadways;

[0027] (3) Achieve segmented isolation and controllable pulp discharge;

[0028] (4) By using a plugging device, grouting can begin in the outer section after the inner section reaches the rated grouting pressure. The process is simple, low-cost, and can achieve a variety of support effects.

[0029] 4. The sealing device of the present invention can not only achieve the sealing segment in the middle of the anchor cable hole, but also adapt to anchor cable holes with different diameters. In the early stage before grouting, since the elastic layer is in an unexpanded state and is contained in the groove, the sealing device is easy to insert into the anchor cable hole along with the cable body. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the grouting system of the present invention, in which the cable body is inserted into the anchor cable hole;

[0031] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0032] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of the central plugging device in the un-grouted state;

[0033] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure of the central plugging device in the grouting state;

[0034] Figure 5 for Figure 3 A schematic diagram of the distribution structure of the limiting groove after shearing, laying, and unfolding along the outer side of the first cylinder;

[0035] Figure 6 for Figure 4 Enlarged structural diagram at point B;

[0036] Figure 7 for Figure 4 Enlarged structural diagram at point C;

[0037] Figure 8 This is a schematic diagram of the cable structure of the present invention arranged in the surrounding rock within the tunnel.

[0038] Explanation of key symbols:

[0039] 1. Cable body; 2. Grouting channel; 3. Grouting hole; 4. Waterstop strip; 5. Grout-blocking membrane; 6. Sealer; 7. Anchor cable hole; 8. Tray; 9. Grout-stopping plug; 10. Feed inlet; 11. Valve groove; 12. Valve ball; 13. Base; 14. Discharge channel; 15. Pressure-bearing rod; 16. Telescopic pipe; 17. Spring; 18. First cylinder; 19. Limiting groove; 20. Limiting block; 21. First conical tooth; 22. Second conical tooth; 23. Second cylinder; 24. Screw; 25. Plate; 26. First through hole; 27. Second through hole; 28. One-way valve plate; 29. ​​Plug groove; 30. Piston; 32. Groove; 33. Elastic layer; 34. Return channel; 35. Connecting pipe. Detailed Implementation

[0040] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0041] Example 1

[0042] Please combine Figures 1 to 8 The adjustable grout discharge hollow segmented pressurized grouting system includes a cable body 1 adapted to the anchor cable hole 7. A grout stop plug 9 and a tray 8 are sequentially sleeved and fixed at one end of the cable body 1 near the opening of the anchor cable hole 7.

[0043] The cable body 1 has grouting channels 2 inside, and multiple grouting holes 3 connected to the grouting channels 2 are sequentially opened on the outer side of the cable body 1. A plug 6 is set in the middle of the cable body 1, and the plug 6 divides the cable body 1 into an inner section and an outer section in the axial direction of the cable body 1. In this embodiment, the plug 6 is used to seal the middle section of the anchor cable hole 7, further increasing the amount of grout injected into the deep (inner section), sealing the shallow layer, and achieving the effect of increasing the grout diffusion radius.

[0044] The sealing device 6 can be divided into several independent cavities by a heat-insulating layer, each containing polyurethane sealing agents A and B in a cross-containment manner. Squeezing the sealing bag with both hands opens the heat-insulating layer, promoting drug mixing and creating an intermediate sealing segment.

[0045] Each grouting hole 3 is covered with a grout-blocking membrane 5 that can temporarily seal its opening. The thickness of the grout-blocking membrane 5 gradually increases from the inside to the outside. Through the grout-blocking membrane 5, an unconnected grouting hole 3 can be formed, so that segmented and controllable grouting can be achieved according to the change of grouting pressure in different grouting sections.

[0046] Each grouting hole 3 is fitted with a waterstop strip 4 on both sides of the axial direction of the cable body 1. Each two adjacent waterstop strips 4 form an independent grouting section. When the waterstop strip 4 comes into contact with the grout, it will expand and deform to make a tight contact with the wall of the anchor cable hole 7 at the corresponding position, so as to divide the cable body 1 into several independent grouting sections to achieve the effect of segmented grouting, increase the grouting pressure of the grouting section and increase the grouting volume.

[0047] When grouting is performed on each grouting section using a certain pressure (with the pressure gradually increasing), the grout in the corresponding grouting hole 3 will break through the corresponding grout-blocking membrane 5 and flow into the grouting section. The grout-blocking membrane 5 is broken through by different grouting pressures, achieving segmented and controllable grouting. The unique grouting process that achieves controllable grouting through the grout-blocking membrane 5 enables the anchor cable grouting pressure of this system to reach 2-3 MPa, while the grouting pressure of conventional grouting anchor cables can only reach 1.5-2 MPa.

[0048] In this embodiment, the initial flow direction of the grout during grouting is specified as follows: from one end of the outer section near the opening of the anchor cable hole 7 to the end of the inner section; the plug 6 can prevent the grout from flowing back to the outer section before the grouting operation in the inner section is completed, and allow the grout to flow back to the outer section after the grouting operation in the inner section is completed, so as to carry out grouting operation in the outer section.

[0049] This system changes the traditional grouting sequence. Segmented grouting allows the grouting process to gradually move from the deep layers of the tunnel to the shallow layers (i.e., grouting is carried out sequentially from the grouting area at the end of the inner section to the grouting area at the front of the outer section). This effectively solves the long-standing engineering problem of shallow tunnels being prone to preferential infiltration, causing grout leakage.

[0050] Each grouting hole 3 is spirally distributed along the axial direction of the cable body 1, breaking the traditional layout design of grouting hole 3. The grouting holes 3 are arranged in a spiral upward manner on the grouting anchor cable to achieve the effect of uniform grouting.

[0051] In this embodiment, the anchoring depth and grouting depth of the anchor cable are significantly increased compared to the previous conventional grouting anchor cable depth. The grouting depth of the hollow segmented pressurized grouting anchor cable is about 5m, while the conventional grouting anchor cable requires resin cartridges for anchoring and the actual grouting depth is about 3m. Anchor cable grouting can greatly increase the grouting hole depth.

[0052] The grouting system in this embodiment achieves the grouting support effects of conventional grouting anchors, traditional segmented grouting anchors, and a combination of long and short anchors. In terms of economic benefits, the anchor ends do not require anchoring, saving on resin cartridge costs, and the material costs of the grouting anchors remain unchanged. In terms of social benefits, it effectively increases the depth of the grouting holes and the amount of grout injected, resulting in a more significant support effect.

[0053] Example 2

[0054] The difference between this embodiment and Embodiment 1 is that this embodiment provides a hollow segmented pressurized grouting method with adjustable grout output applied to Embodiment 1, comprising the following steps:

[0055] S1. Insert the cable body 1 into the pre-drilled anchor cable hole 7;

[0056] S2. Grouting operation with gradually increasing pressure through grouting channel. The grout flows from the outer section to the end of the inner section. Under pressure, the grout breaks through the grouting membrane at each grouting hole in sequence from the end of the inner section to the front of the outer section, so that the grout flows into the surrounding rock fissures in each grouting area in sequence, thereby increasing the strength of the surrounding rock in each grouting area in sequence.

[0057] Each time the grout flows into a grouting area, it will contact the corresponding waterstop strip in that area, causing it to expand and deform to form a sealed space by making a tight contact with the hole wall of the anchor cable hole. After the grouting area is completely grouted, the next grouting area will be grouted.

[0058] Example 3

[0059] Please combine Figures 1 to 8 This embodiment is a preferred embodiment of embodiment 1. One end of the plug 6 has an inlet 10 connected to the outer section, and the other end has an outlet channel 14 connected to the inner section. The inlet end of the outlet channel 14 is connected to the outlet end of the inlet 10. The plug 6 has a base 13 inside. A valve ball 12 that can block the outlet end of the inlet 10 is elastically provided on the side of the base 13 facing the outer section. The plug 6 also has a return channel 34 that directly connects the inner section and the outer section. The plug 6 is provided with a sealing mechanism. The sealing mechanism is used to release the seal on the return channel 34 when the grouting of the inner section is completed, so as to allow the grout to flow back to the outer section.

[0060] The discharge end of the feed inlet 10 has a valve groove 11 that seals with the valve ball 12.

[0061] A hollow telescopic tube 16 is provided between the valve ball 12 and the base 13. A spring 17 is provided inside the telescopic tube 16. The two ends of the spring 17 are fixed to the valve ball 12 and the base 13 respectively. When the valve ball 12 blocks the discharge end of the feed inlet 10, the spring 17 is in a compressed deformation state.

[0062] The sealing mechanism includes a plate 25 perpendicular to the axis of the cable body 1. The plate 25 is slidably inserted into the base 13. The plate 25 has a first through hole 26 and a second through hole 27. A one-way valve plate 28 with a flipping direction adapted to the flow direction of the slurry in the return channel 34 is elastically provided in the second through hole 27.

[0063] The plugger 6 is equipped with a transmission mechanism. The transmission mechanism is driven by the valve ball 12 to move toward the base 13, which drives the plate 25 to move centrifugally, so that the first through hole 26 is moved into the discharge channel 14 and the second through hole 27 is moved into the return channel 34.

[0064] The maximum flip angle of the one-way valve plate 28 is ninety degrees.

[0065] One side of the one-way valve plate 28 is connected to the wall of the second through hole 27 by a coil spring.

[0066] In this embodiment, the spring force coefficient of the coil spring can be set or selected according to the grouting pressure required when the inner section is completely grouted. This ensures that after the inner section is completely grouted, further increasing the grouting pressure will cause the squeezing force of the inner grout on the one-way valve plate 28 to be greater than the sum of the spring force and the grout pressure generated by the outer section on the other side of the one-way valve plate 28. This ensures that after the inner section is grouted, the one-way valve plate 28 automatically releases the seal on the return channel 34, allowing the grout to flow back to the outer section through the return channel 34 and participate in the grouting operations of each grouting area in the outer section in sequence.

[0067] The transmission mechanism includes a pressure-bearing rod 15 concentrically inserted into a telescopic tube 16. One end of the pressure-bearing rod 15 is fixed to the side wall of the valve ball 12. A first cylinder 18 concentric with the pressure-bearing rod 15 is rotatably inserted into the base 13. The other end of the pressure-bearing rod 15 passes through the first cylinder 18. A spiral-shaped limiting groove 19 is opened on the inner circumference of the first cylinder 18. A limiting block 20 that slides and engages with the limiting groove 19 is fixed on the outer wall of the pressure-bearing rod 15. A first bevel tooth 21 is fixed at one end of the first cylinder 18. A second bevel tooth 22 that meshes with the first bevel tooth 21 is provided in the base 13. A second cylinder 23 corresponding to the plate 25 is concentrically fixed on the second bevel tooth 22. The second cylinder 23 is rotatably installed in the base 13. A screw 24 is threaded into one end of the second cylinder 23. One end of the screw 24 is fixed to the centripetal end of the plate 25.

[0068] Both ends of the plug 6 are connected to the connecting pipe 35, which connects the inner section and the outer section respectively.

[0069] In this embodiment, when the valve ball 12 is sealed to the valve groove 11, the first through hole 26 and the second through hole 27 of the plate 25 are misaligned with the discharge channel 14 and the return channel 34 respectively. The discharge channel 14 and the return channel 34 are in a closed state, so as to protect the grouting holes 3, waterstop strips 4 and grout-blocking membranes 5 in the inner section.

[0070] When the valve ball 12 moves toward the base 13 under pressure, it can drive the pressure rod 15 to gradually penetrate into the first cylinder 18, so that the limiting block 20 can rub and squeeze the limiting groove 19, forcing the first cylinder 18 to drive the first bevel tooth 21, the second bevel tooth 22, and the second cylinder 23 to rotate, so that the second cylinder 23 and the screw 24 interact with each other, thereby pushing the plate 25 to move centrifugally, so that the first through hole 26 moves into the discharge channel 14, and the second through hole 27 moves into the return channel 34, releasing the blockage of the discharge channel 14, and moving the one-way valve plate 28 into the return channel 34, so that it can withstand the squeezing force from the inner section slurry.

[0071] Furthermore, to improve the sealing effect of the plug 6 on the anchor cable hole 7, this embodiment has a groove 32 formed on the outer periphery of the plug 6. An elastic layer 33, capable of completely sealing the groove opening, is provided within the groove 32. The elastic layer 33 can be made of a corrosion-resistant and high-temperature-resistant elastic material. A plug groove 29 is formed inside the plug 6. One end of the plug groove 29 connects to the groove 32, and the other end connects to the return channel 34. A piston 30 is installed in the plug groove 29, and the centripetal side of the piston 30 is fixedly connected to the centrifugal side of the plate 25. Hydraulic oil is contained in the groove 32.

[0072] In this embodiment, when the plate 25 moves centrifugally, the first through hole 26 moves to the discharge channel 14 and the second through hole 27 moves to the return channel 34. At this time, the plate 25 will also drive the piston 30 to move in the plug groove 29 to squeeze the hydraulic oil in the plug groove 29 into the groove 32, so that the elastic layer 33 expands and deforms to be tightly connected with the wall of the anchor cable hole 7. This not only achieves the sealing segment in the middle of the anchor cable hole 7, but also allows the plugger 6 to be adapted to anchor cable holes 7 with different diameters. In the early stage, when grouting is not performed, the elastic layer 33 is in an unexpanded state and is contained in the groove 32, making it easy for the plugger 6 to be inserted into the anchor cable hole 7 along with the cable body 1.

[0073] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A hollow segmented pressurized grouting system with adjustable grout output, characterized in that, The cable body is adapted to the anchor cable hole. The cable body has a grouting channel. Multiple grouting holes communicating with the grouting channel are sequentially opened on the outer side of the cable body. A plug is provided in the middle of the cable body, and the plug divides the cable body into an inner section and an outer section in the axial direction of the cable body. Each of the grouting holes is covered with a grout-blocking membrane that can temporarily seal its opening. The thickness of the grout-blocking membrane gradually increases from the inside to the outside. Each grouting hole is fitted with a water-stop strip on both sides of the cable body along the axial direction. An independent grouting interval is formed between every two adjacent water-stop strips. When the water-stop strip comes into contact with the grout, it expands and deforms to make a tight contact with the wall of the anchor cable hole at the corresponding position. When grouting is performed on each grouting interval, the grout in the corresponding grouting hole will break through the corresponding grout-blocking membrane and flow into the grouting interval. The initial flow direction of the grout during grouting is specified as follows: from one end of the outer section near the opening of the anchor cable hole to the end of the inner section; The plugging device can prevent grout from flowing back to the outer section before the grouting operation is completed in the inner section, and allow grout to flow back to the outer section after the grouting operation is completed in the inner section, so as to carry out grouting operation in the outer section.

2. The adjustable-discharge hollow segmented pressurized grouting system as described in claim 1, characterized in that, The grouting holes are all spirally distributed around the cable body along its axial direction.

3. The adjustable-discharge hollow segmented pressurized grouting system as described in claim 1, characterized in that, A grout stopper and a tray are sequentially fitted and fixed at one end of the cable body near the opening of the anchor cable hole.

4. The adjustable-discharge hollow segmented pressurized grouting system as described in claim 1, characterized in that, The plug has an inlet at one end connected to the outer section and an outlet at the other end connected to the inner section. The inlet of the outlet is connected to the outlet of the inlet. The plug has a base inside, and a valve ball capable of blocking the outlet of the inlet is elastically provided on the side of the base facing the outer section. The plug also has a return channel that directly connects the inner section and the outer section. The plug is equipped with a sealing mechanism, which is used to release the seal on the return channel when the grouting of the inner section is completed.

5. The adjustable-discharge hollow segmented pressurized grouting system as described in claim 4, characterized in that, The discharge end of the feed inlet has a valve groove that seals with the valve ball.

6. The adjustable-discharge hollow segmented pressurized grouting system as described in claim 4, characterized in that, A hollow telescopic tube is provided between the valve ball and the base, and a spring is provided inside the telescopic tube. The two ends of the spring are fixed to the valve ball and the base respectively. When the valve ball blocks the discharge end of the feed inlet, the spring is in a compressed deformation state.

7. The adjustable-discharge hollow segmented pressurized grouting system as described in claim 6, characterized in that, The sealing mechanism includes a plate perpendicular to the axis of the cable body. The plate is slidably inserted into the base. The plate has a first through hole and a second through hole. A one-way valve plate with a flipping direction adapted to the flow direction of slurry in the return channel is elastically disposed in the second through hole. The plugger is provided with a transmission mechanism. The transmission mechanism is driven by the valve ball to move towards the base, thereby driving the plate to move centrifugally, so that the first through hole is moved into the discharge channel and the second through hole is moved into the return channel.

8. The adjustable-discharge hollow segmented pressurized grouting system as described in claim 7, characterized in that, The maximum flip angle of the one-way valve plate is ninety degrees.

9. The adjustable-discharge hollow segmented pressurized grouting system as described in claim 7, characterized in that, The transmission mechanism includes a pressure-bearing rod concentrically inserted into the telescopic tube. One end of the pressure-bearing rod is fixed to the side wall of the valve ball. A first cylinder concentric with the pressure-bearing rod is rotatably inserted into the base. The other end of the pressure-bearing rod passes through the first cylinder. A spiral-shaped limiting groove is formed on the inner circumference of the first cylinder. A limiting block that slidably engages with the limiting groove is fixed on the outer wall of the pressure-bearing rod. A first conical tooth is fixed to one end of the first cylinder. A second conical tooth that meshes with the first conical tooth is provided in the base. A second cylinder corresponding to the plate is concentrically fixed on the second conical tooth. The second cylinder is rotatably installed in the base. A screw is threaded into one end of the second cylinder. One end of the screw is fixed to the centripetal end of the plate.

10. A hollow segmented pressurized grouting method with adjustable grout output, characterized in that, It utilizes the grouting system as described in any one of claims 1-9, comprising the following steps: S1. Insert the cable into the pre-drilled anchor cable hole; S2. Grouting operation with gradually increasing pressure through grouting channel. The grout flows from the outer section to the end of the inner section. Under pressure, the grout breaks through the grouting membrane at each grouting hole in sequence from the end of the inner section to the front of the outer section, so that the grout flows into the surrounding rock fissures in each grouting area in sequence, thereby increasing the strength of the surrounding rock in each grouting area in sequence. Each time the grout flows into a grouting area, it will contact the corresponding waterstop strip in that area, causing it to expand and deform to form a sealed space by making a tight contact with the hole wall of the anchor cable hole. After the grouting area is completely grouted, the next grouting area will be grouted.

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