Grouting reinforcement device suitable for water-containing fault zone

Abstract

The invention discloses a grouting reinforcement device suitable for a water-containing fault zone, and belongs to the technical field of grouting reinforcement. A filling pipe is inserted into one end of a grouting plug, an air inlet pipe and a slurry inlet pipe are installed at one end of the filling pipe, a grouting pipe is arranged at the other end of the filling pipe, one end of the grouting pipe penetrates through the interior of the grouting plug and extends out, and the other end of the grouting pipe penetrates through the grouting plug; before grouting, high-pressure gas is fed into the blocked drill hole from the grouting pipe through the gas inlet pipe, soft muddy filler in rock wall cracks is pushed out of the grouting range through the high-pressure gas, and during grouting, composite grouting materials are conveyed through the grouting pipe. High-pressure gas is fed into a drill hole from the grouting pipe through the gas inlet pipe, soft muddy filler in rock wall cracks can be accurately cleaned and pushed out of the grouting range, conditions are created for follow-up better crack filling of grout, the grouting reinforcement effect is guaranteed, and compared with a traditional hole cleaning mode, the grouting reinforcement method has the advantages that the construction efficiency is improved, and the construction cost is reduced. The situation that cracks cannot be effectively filled with slurry due to mud residues can be avoided, and waste of slurry materials is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of grouting reinforcement, and particularly relates to a grouting reinforcement device suitable for water-containing fault zones. BACKGROUND

[0002] In the process of underground construction, unfavorable geology such as fault fracture zones will inevitably be encountered. During the formation process, the fault fracture zones are subjected to strong tectonic stress, resulting in broken rock mass and low mechanical strength, and most of them have good water enrichment. When the roadway is excavated to the fault zone, disasters such as face collapse and water and mud inrush are prone to occur, causing significant damage to the project. After the roadway is excavated, due to the development of fractures in the fault fracture zone and the broken rock mass, the rock mass has good permeability, and underground water can easily seep through the fault zone to the surrounding rock of the tunnel, forming a high water pressure area near the fault, which enhances the seepage effect of underground water on the surrounding rock, posing a serious threat to the rapid excavation of the roadway and the safety of personnel.

[0003] Traditional grouting materials such as cement slurry have low cost but poor mechanical properties, and have limited diffusion effect in water-containing fault zones, making it difficult to effectively plug the fractures and control the seepage of underground water. Although high molecular materials such as polyurethane have good fluidity and water plugging performance, they have high cost and high viscosity, and are not economical and convenient to use alone. In addition, the existing grouting device is prone to unstable grouting reinforcement effect due to poor permeation and diffusion efficiency of the slurry when used in complex geological conditions of water-containing fault zones. SUMMARY

[0004] The purpose of the present application is to provide a grouting reinforcement device suitable for water-containing fault zones to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a grouting reinforcement device suitable for water-containing fault zones, comprising a grouting plug, one end of the grouting plug is connected with a plug pipe, one end of the plug pipe is provided with an air inlet pipe and a grout inlet pipe, and the grout inlet pipe is located on one side of the air inlet pipe, one end of the grouting plug is provided with an air pipe, and the air pipe is located on one side of the plug pipe, a one-way valve is arranged in the air pipe, and the one-way valve adopts a rubber duckbill valve structure. The other end of the plug pipe is provided with a grouting pipe, one end of the grouting pipe penetrates through the inside of the grouting plug and extends out, before grouting, high-pressure gas is sent from the grouting pipe into the plugged drill hole through the air inlet pipe, so that the high-pressure gas pushes the soft and muddy filler in the rock wall fracture to outside the grouting range, and during grouting, the composite grouting material is transported through the grout inlet pipe.

[0006] In the implementation process, the grouting plug is a basic component of the device, one end of which is connected to the filling pipe, one end of the filling pipe is installed into the air pipe and the grouting pipe, and the grouting pipe is on one side of the air pipe. The grouting plug is also provided with an air pipe on one end, the air pipe is on one side of the filling pipe, and the air pipe is provided with a one-way valve with a rubber duckbill valve structure to prevent gas backflow and ensure the stability of the grouting plug inflation. The other end of the filling pipe is provided with a grouting pipe, one end of the grouting pipe penetrates into the grouting plug and extends out. In use, high-pressure gas is first sent from the grouting pipe into the blocked borehole through the air pipe, and the impact force of the high-pressure gas pushes the soft and loose argillaceous filling material in the rock wall fracture to the outside of the grouting range, thereby cleaning the borehole and the fracture and creating good conditions for subsequent grouting, so that the grout can better fill the fracture and improve the grouting reinforcement effect. During grouting, the composite grouting material is transported through the grouting pipe to fill the fracture and achieve reinforcement and sealing of the water-bearing fault zone.

[0007] In a specific embodiment, the composite grouting material is prepared from cement, water, polyurethane, graphene oxide, nano-silicon dioxide, fly ash, and polycarboxylic acid water reducing agent.

[0008] In the implementation process, the cement is 10-110 parts, the water is 200-250 parts, the polyurethane is 10-20 parts, the graphene oxide is 5-10 parts, the nano-silicon dioxide is 3-4 parts, the fly ash is 20-30 parts, and the polycarboxylic acid water reducing agent is 8-15 parts. The preparation method of the composite grouting material is as follows: Step one: according to the following mass fraction, the raw materials are weighed, cement 64 parts, water 32 parts, polyurethane 12 parts, graphene oxide 6 parts, nano-silicon dioxide 3 parts, fly ash 25 parts, and polycarboxylic acid water reducing agent 10 parts. Step two: put the weighed cement into the stirring barrel, and add the dry materials such as graphene oxide, nano-silicon dioxide, fly ash, and polycarboxylic acid water reducing agent to the cement in sequence, and stir the dry materials for 3 min until they are evenly mixed. Step three: weigh a certain amount of tap water into the stirring barrel, and use the stirrer to mix the cement dry materials and water until there are no cement lumps. Step four: add the corresponding mass fraction of polyurethane to the uniform cement slurry, and stir thoroughly until the final product is obtained.

[0009] In a specific embodiment, the other end of the grouting plug is provided with a lower connecting plate, the lower connecting plate is sleeved on the surface of the grouting pipe, the outer surface of the grouting pipe is sleeved with an upper connecting plate, the surfaces of the upper and lower connecting plates that are close to each other are provided with gauze and a sleeve, the inner surface of the gauze is in close contact with the outer surface of the sleeve, and the outer surface of the sleeve is provided with uniformly arranged grout outlets.

[0010] In the implementation process, when grouting, the slurry flows out of the grouting pipe, and when the grouting pipe is withdrawn into the sleeve, the slurry flows out of the grouting hole on the sleeve, so that the gauze can expand under the pressure of the slurry, thereby realizing the compaction of the broken rock mass. The outer diameter of the grouting pipe is smaller than the inner diameter of the sleeve, forming an annular grouting channel to ensure uniform penetration. The length of the sleeve and the length of the grouting pipe can be adjusted according to the degree of fracture development.

[0011] In a specific embodiment, when the grouting pipe is withdrawn into the sleeve for grouting, the slurry penetrates outward from the grouting hole to expand the gauze, causing the gauze to expand and compact the broken rock mass.

[0012] In the implementation process, when grouting, the slurry flows out of the grouting pipe, and when the grouting pipe is withdrawn into the sleeve, the slurry continuously penetrates and exerts pressure on the gauze wrapped around the periphery of the sleeve. As the slurry continues to seep out, the gauze gradually expands under the pressure, and the expanded gauze exerts pressure on the surrounding broken rock mass, thereby compacting the broken rock mass. This can improve the density of the broken rock mass to some extent, enhance its stability, and achieve better reinforcement and sealing effects, effectively preventing water penetration and improving the load-bearing capacity of the rock mass.

[0013] In a specific embodiment, the outer surface of the grouting pipe is provided with a pressing plate, and the pressing plate is located on the inner side of the sleeve. The top of the pressing plate is provided with uniformly arranged limiting blocks, and the top of the upper connecting plate and the gauze are provided with limiting holes that are embedded with the limiting blocks.

[0014] In the implementation process, the upper connecting plate and the pressing plate are provided to fix the gauze. The gauze is fixed between the upper connecting plate and the pressing plate through the embedding of the limiting holes and the limiting blocks, improving the connection stability of the gauze. During the grouting process, the displacement of the pressing plate, the upper connecting plate, and the gauze is prevented, ensuring the stability of the grouting device structure, and thus the slurry can uniformly seep out of the grouting hole of the sleeve according to the design requirements, allowing the gauze to normally expand and compact the broken rock mass, ensuring the grouting reinforcement effect.

[0015] In a specific embodiment, one end of the inflation pipe is connected to the air supply pipe for sending air into the grouting plug. When air enters the grouting plug, the grouting plug expands under the action of air pressure until its outer surface abuts against the inner wall of the borehole.

[0016] In the implementation process, the inflation pipe plays a key connecting role, one end of the inflation pipe is connected with the air conveying pipe, the air conveying pipe is connected with the air compressor, air enters the inside of the grouting plug through the inflation pipe, with the continuous entering of air, the air pressure in the inside of the grouting plug gradually increases, under the action of the air pressure, the grouting plug starts to expand, and the expansion is continued until the outer surface of the grouting plug tightly abuts against the inner wall of the drill hole, so that the purpose of sealing the drill hole is achieved, the grout is prevented from leaking from the gap between the drill hole wall and the plug during grouting, the grouting work can be effectively carried out in a closed space to a certain extent, and the grouting effect and quality are improved.

[0017] In a specific embodiment, the cement is ordinary portland cement with a mark of P·O42.5.

[0018] In the implementation process, the ordinary portland cement has high strength, can quickly improve the compressive resistance of the rock mass, prevent the rock mass from further breaking and collapsing, can improve the impermeability of the grouting body, better block the cracks of parts such as the water-bearing fault zone, prevent water from seeping, and to a certain extent, resist carbonization, so that the grouting body can maintain stable performance for a long time in some environments with carbon dioxide and other gases, and prolong the service life.

[0019] In a specific embodiment, the graphene oxide is brown and powdery, and the particle size is selected to be 20-40 mu m.

[0020] In the implementation process, the graphene oxide has rich functional groups such as hydroxyl, carboxyl and epoxy groups, and is easy to graft and modify.

[0021] In a specific embodiment, the nano-silicon dioxide is white and powdery solid, and the particle size is selected to be less than 0.3 microns.

[0022] In the implementation process, the nano-silicon dioxide can resist the erosion of sulfate and chloride ions and the like.

[0023] In a specific embodiment, the polyurethane is AB material, and the A material and the B material are mixed at a ratio of 1:1.

[0024] In the implementation process, the polyurethane is AB material, and after being mixed and stirred at a ratio of 1:1, it is put into the cement slurry, the mechanical properties of the gel system are improved by the physical and chemical crosslinking of the polymer in the early stage, and the polyurethane and the cement particles form an organic or inorganic hybrid space interpenetrating network gel structure in the later stage, which has good adhesion to the fault fracture zone rock mass and high strength of the solidified body.

[0025] Compared with the prior art, the present application has the following beneficial effects: 1、The present application can accurately clean the soft and muddy filler in the rock wall crack by sending high-pressure gas from the grouting pipe into the borehole through the air inlet pipe, compared with the traditional hole cleaning method, the slurry cannot effectively fill the crack due to the residual mud can be avoided, the waste of slurry material is reduced, the resource consumption is reduced, the composite grouting material is more fully filled in the crack, the water-bearing fault zone is effectively reinforced, and the good reinforcement effect can prolong the service life of the project and reduce the resource consumption caused by repeated maintenance and reinforcement.

[0026] 2、The present application adds polyurethane and graphene oxide and other modified materials on the basis of cement slurry, not only overcomes the problems of high cost and high viscosity of polyurethane, but also solves the low mechanical property of silicate slurry, the mechanical property of the new grouting material is closely related to the curing time, the content of silicate and polyurethane, the coal sample has good adhesion, the consolidation body has high strength, the reinforcement effect is obvious, the graphene oxide can significantly promote the hydration reaction of cement, the hydration product grows in situ on the surface of graphene nanosheet, the pore structure of the grouting material is optimized, the microcracks between the slurry and the fractured rock mass are reduced, and the fly ash and polycarboxylic acid water reducing agent can improve the density of the slurry.

[0027] 3、The present application is characterized in that the grouting pipe, the sleeve and the gauze are arranged, when the grouting pipe is withdrawn into the sleeve, an annular grouting channel is formed, the slurry flows out through the slurry outlet hole on the sleeve, the gauze can be inflated under the pressure of the slurry, uniform penetration is ensured, the compacted and fractured rock mass is realized, the slurry can be effectively prevented from excessive diffusion or local accumulation, the utilization rate of the slurry is improved, unnecessary material waste is reduced, and resource consumption is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application; Figure 2 It is a schematic diagram of the three-dimensional structure of the sleeve and the gauze of the present application; Figure 3 It is a plan view of the present application; Figure 4 It is a schematic diagram of the grouting plug expansion of the present application; Figure 5 It is a schematic diagram of the gauze expansion during the grouting process of the present application; Figure 6 It is a grouting schematic diagram of the present application; Figure 7 It is a preparation flow chart of the composite grouting material of the present application.

[0029] In the figure: 1, grouting plug; 2, filling pipe; 3, air inlet pipe; 4, grouting pipe; 5, air inlet pipe; 6, lower connecting plate; 7, gauze; 8, sleeve; 9, slurry outlet hole; 10, upper connecting plate; 11, pressing plate; 12, limiting block; 13, limiting hole; 14, grouting pipe. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0031] Please refer to Figures 1-7 The present application provides a grouting reinforcement device for water-containing fault zone, which comprises a grouting plug 1, a plugging pipe 2 inserted into one end of the grouting plug 1, an air inlet pipe 3 and a grout inlet pipe 4 installed at one end of the plugging pipe 2, the grout inlet pipe 4 being located at one side of the air inlet pipe 3, an air charging pipe 5 arranged at one end of the grouting plug 1 and located at one side of the plugging pipe 2, a one-way valve arranged in the air charging pipe 5, the one-way valve being of a rubber duckbill valve structure, a grouting pipe 14 arranged at the other end of the plugging pipe 2, one end of the grouting pipe 14 extending out of the grouting plug 1, before grouting, high-pressure gas is sent from the grouting pipe 14 into the blocked drill hole through the air inlet pipe 3, so that the high-pressure gas pushes the soft and loose argillaceous filling material in the rock fissure out of the grouting range, during grouting, the composite grouting material is delivered through the grout inlet pipe 4, one end of the air charging pipe 5 is connected to an air delivery pipe for sending air into the grouting plug 1, and when the air enters the grouting plug 1, the grouting plug 1 expands under the action of air pressure until the outer surface of the grouting plug 1 abuts against the inner wall of the drill hole.

[0032] Further, the grouting plug 1 is inserted with the plugging pipe 2, the plugging pipe 2 is installed with the air inlet pipe 3 and the grout inlet pipe 4 at one end, the grout inlet pipe 4 is located at one side of the air inlet pipe 3, this layout separates the gas and slurry delivery pipelines, which facilitates independent control of hole cleaning and grouting operation, the grouting plug 1 is further provided with the air charging pipe 5 at one end, the air charging pipe 5 is located at one side of the plugging pipe 2, and the air charging pipe 5 is provided with the one-way valve of the rubber duckbill valve structure, the one-way valve can prevent gas backflow and ensure stable air pressure after the grouting plug 1 expands, preventing the grouting plug 1 from shrinking due to gas backflow, the grouting pipe 14 is arranged at the other end of the plugging pipe 2, one end of the grouting pipe 14 extends out of the grouting plug 1, and the grouting pipe 14 is used for delivering slurry to a specified position; Before grouting, connect the gas inlet pipe to the inflation pipe 5 to inflate the grouting plug 1 with air. Due to the one-way valve function of the rubber duckbill valve structure in the inflation pipe 5, air can only enter the grouting plug 1 in one direction. As air continues to enter, the internal pressure of the grouting plug 1 rises, causing it to gradually expand until the outer surface of the grouting plug 1 tightly abuts the inner wall of the borehole, sealing the borehole and preventing grout from leaking between the borehole wall and the grouting plug 1 during grouting, ensuring that the grouting work is carried out in a relatively closed space, improving grouting efficiency and reinforcement quality. Then, high-pressure gas is introduced through the gas inlet pipe 3, and the high-pressure gas is sent into the already blocked borehole through the grouting pipe 14. The high-pressure gas can push the soft and loose argillaceous fillings in the rock wall fractures to outside the grouting range, creating good conditions for subsequent grouting, allowing the grout to better fill the fractures and improve the grouting reinforcement effect. During the hole cleaning process, the gas pressure and duration can be adjusted according to the actual situation to ensure complete hole cleaning. After hole cleaning is completed, grouting operation begins, and composite grouting material is transported through the grout inlet pipe 4. The composite grouting material flows out of the front end of the grouting pipe 14 along the channel of the grout inlet pipe 4, the inflation pipe 2, and the grouting pipe 14, filling the rock wall fractures treated by hole cleaning. During the grouting process, the grouting pressure and grouting amount are closely monitored and adjusted according to the actual situation to ensure that the grout can fully fill the fractures and achieve the desired reinforcement effect.

[0033] The composite grouting material is prepared from cement, water, polyurethane, graphene oxide, nano-silicon dioxide, fly ash, and polycarboxylic acid water reducer. The cement is P·O42.5 ordinary portland cement, the graphene oxide is brownish-brown powder with a particle size of 20-40 μm, the nano-silicon dioxide is white powder solid with a particle size of 0.3 microns or less, and the polyurethane is AB material, in which A and B are mixed at a ratio of 1:1.

[0034] Further, the preparation method of the composite grouting material is as follows: Step one: measure the following mass fractions of each raw material, cement 64 parts, water 32 parts, polyurethane 12 parts, graphene oxide 6 parts, nano-silicon dioxide 3 parts, fly ash 25 parts, and polycarboxylic acid water reducer 10 parts; Step two: place the measured cement into a stirring barrel and add the measured graphene oxide, nano-silicon dioxide, fly ash, and polycarboxylic acid water reducer into the cement one after another, and stir the dry materials for 3 minutes until they are evenly mixed; Step three: measure a certain mass of tap water into the stirring barrel, and use the stirrer to mix the cement dry materials with water until there are no cement lumps; Step four: add the corresponding mass fraction of polyurethane to the uniform cement slurry, and mix well to the final product. The cement in step two is P·O42.5 ordinary portland cement, the graphene oxide is a brownish powder with an average particle size of 20-40 μm, and has abundant functional groups such as hydroxyl, carboxyl and epoxy groups, which are easy to graft and modify. The nano-silica is a white powder solid with a particle size of less than 0.3 microns, which can make the modified cement slurry resistant to sulfate and chloride ion attack. Fly ash is gray-black powder, which can improve the fluidity of the slurry and can penetrate into small cracks. Polycarboxylic acid water reducer is a brownish yellow powder, which can reduce the porosity of the slurry and make the stone body more dense. Polyurethane is AB material, which is mixed and stirred at a ratio of 1:1 and then added to the cement slurry. The early stage relies on the physical and chemical crosslinking of the polymer to improve the mechanical properties of the gel system, and the later stage forms an organic or inorganic hybrid space interpenetrating network gel structure with the cement particles, which has good adhesion to fault fracture zone rock mass and high consolidation body strength.

[0035] The other end of the grouting plug 1 is provided with a lower connecting plate 6, the lower connecting plate 6 is sleeved on the surface of the grouting pipe 14, the outer surface of the grouting pipe 14 is sleeved with an upper connecting plate 10, the surfaces of the upper connecting plate 10 and the lower connecting plate 6 close to each other are provided with gauze 7 and sleeve 8, the inner surface of the gauze 7 is fitted with the outer surface of the sleeve 8, and the outer surface of the sleeve 8 is provided with uniformly arranged grouting holes 9. When the grouting pipe 14 is withdrawn into the sleeve 8 for grouting, the slurry penetrates and expands the gauze 7 from the grouting holes 9, so that the gauze 7 is inflated and compacted to crush the rock mass. The outer surface of the grouting pipe 14 is sleeved with a pressing plate 11, and the pressing plate 11 is located on the inner side of the sleeve 8. The top of the pressing plate 11 is provided with uniformly arranged limiting blocks 12. The top of the upper connecting plate 10 and the gauze 7 are both provided with limiting holes 13, and the limiting holes 13 and the limiting blocks 12 are embedded.

[0036] Further, before use, first put the pressing plate 11 into the sleeve 8, and fix the pressing plate 11 on the upper connecting plate 10 by the embedding of the limiting block 12 and the limiting hole 13, then the gauze 7 can be limited, then the lower connecting plate 6 is fixed on the grouting plug 1, the accurate positioning and stable connection between components are completed, and it is ensured that the components cannot be moved randomly during the grouting process, finally the grouting pipe 14 is inserted into the filling pipe 2, and is stretched out after passing through the grouting plug 1, the lower connecting plate 6, the sleeve 8, the pressing plate 11 and the upper connecting plate 10 in sequence, the composite grouting material is transported through the grouting pipe 14 during grouting, when the grouting pipe 14 is withdrawn into the sleeve 8, the slurry is uniformly arranged on the outer surface of the sleeve 8 and is exuded from the slurry outlet hole 9, the exuded slurry is permeated to the gauze 7, the gauze 7 is expanded under the pressure of the slurry, the expanded gauze 7 exerts pressure on the surrounding broken rock mass, and the effect of compacting the broken rock mass is achieved, and the density and stability of the broken rock mass are improved, so that the reinforcement purpose is achieved. During the whole process, the embedding structure of the limiting block 12 and the limiting hole 13 ensures the stability of the gauze 7, the sleeve 8 and other components, and ensures that the slurry can be uniformly exuded from the slurry outlet hole 9 as expected and the gauze 7 can normally play the function of expanding and compacting.

[0037] The working principle and use process of the present application are as follows: first, the components of the device, such as the grouting plug 1, the filling pipe 2, the grouting pipe 14, the air inlet pipe 3, the slurry inlet pipe 4, the air filling pipe 5 and the like, are assembled to ensure that the components are connected tightly, and in particular, the one-way valve of the rubber duckbill valve structure in the air filling pipe 5 is installed correctly to ensure its sealing performance and one-way conduction function; Then the grouting reinforcement device is placed into the drilled hole in advance, the grouting plug 1 is inflated through the air filling pipe 5, the one-way valve of the rubber duckbill valve structure is used to ensure that the gas enters in one direction, the grouting plug 1 is expanded and kept in a stable state, then the high-pressure gas is sent from the grouting pipe 14 into the blocked drill hole through the air inlet pipe 3, the high-pressure gas generates impact force in the drill hole, and the soft argillaceous filling material in the rock wall fracture is pushed out of the grouting range, so that the purpose of cleaning the drill hole and the fracture is achieved, and good conditions are created for subsequent grouting, so that the slurry can better fill the fracture; Then the composite grouting material is transported through the slurry inlet pipe 4, the material flows along the grouting pipe 14, the exuded slurry fills the rock wall fracture, the reinforcement and plugging of the water-bearing fault zone are achieved, then the grouting pipe 14 is withdrawn into the sleeve 8, and the grouting is continued, at this time the slurry is filled in the inside of the sleeve 8 and is exuded out through the slurry outlet hole 9, so that the slurry can expand the gauze 7, at this time the gauze 7 closely adheres to the rock wall with the slurry, after the grouting is completed, the transportation of the slurry and the gas is stopped, and the grouting effect is checked, such as checking the filling of the slurry in the fracture, the strength of the reinforced rock mass and the like.

[0038] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A device for grouting reinforcement of water-containing fault zones, comprising a grouting plug (1), characterized in that, One end of the grouting plug (1) is inserted with a plugging pipe (2), one end of the plugging pipe (2) is provided with an air inlet pipe (3) and a grouting pipe (4), and the grouting pipe (4) is located on one side of the air inlet pipe (3), one end of the grouting plug (1) is provided with an air pipe (5), and the air pipe (5) is located on one side of the plugging pipe (2), the inside of the air pipe (5) is provided with a one-way valve, and the one-way valve adopts a rubber duckbill valve structure. The other end of the plugging pipe (2) is provided with a grouting pipe (14), one end of the grouting pipe (14) penetrates through the inside of the grouting plug (1) and extends out, before grouting, high-pressure gas is sent from the grouting pipe (14) into the plugged drill hole through the air inlet pipe (3), so that the high-pressure gas pushes the soft and loose argillaceous filling in the rock wall fracture to outside the grouting range, and during grouting, the composite grouting material is transported through the grouting pipe (4).

2. The device for grouting and reinforcing according to claim 1, characterized in that, The composite grouting material is prepared from cement, water, polyurethane, graphene oxide, nano silicon dioxide, fly ash and polycarboxylic acid water reducing agent.

3. The device for grouting and reinforcing according to claim 1, characterized in that, The other end of the grouting plug (1) is provided with a lower connecting plate (6), the lower connecting plate (6) is sleeved on the surface of the grouting pipe (14), the outer surface of the grouting pipe (14) is sleeved with an upper connecting plate (10), the surfaces of the upper connecting plate (10) and the lower connecting plate (6) that are close to each other are provided with gauze (7) and sleeve pipe (8), the inner surface of the gauze (7) is fitted with the outer surface of the sleeve pipe (8), and the outer surface of the sleeve pipe (8) is provided with uniformly arranged grouting holes (9).

4. The device for grouting and reinforcing according to claim 3, characterized in that, When the grouting pipe (14) is retracted into the sleeve pipe (8) for grouting, the slurry penetrates and expands the gauze (7) outward from the grouting holes (9), so that the gauze (7) is expanded and compacts the broken rock mass.

5. The device for grouting and reinforcing according to claim 3, characterized in that, The outer surface of the grouting pipe (14) is sleeved with a pressing plate (11), and the pressing plate (11) is located on the inner side of the sleeve pipe (8), the top of the pressing plate (11) is provided with uniformly arranged limiting blocks (12), the top of the upper connecting plate (10) and the gauze (7) are provided with limiting holes (13) penetrating through, and the limiting holes (13) and the limiting blocks (12) are embedded.

6. The device for grouting and reinforcing according to claim 1, characterized in that, One end of the air pipe (5) is connected with a gas conveying pipe for sending air into the grouting plug (1), when the air enters the grouting plug (1), the grouting plug (1) is inflated under the action of air pressure until the outer surface of the grouting plug (1) abuts against the inner wall of the drill hole.

7. The device for grouting and reinforcing according to claim 2, characterized in that, The cement is P·O42.5 ordinary portland cement.

8. The device for grouting and reinforcing according to claim 2, characterized in that, The graphene oxide is brownish-brown powder, and the particle size is selected to be 20-40μm.

9. The device for grouting and reinforcing according to claim 2, characterized in that, The nano silicon dioxide is white powder solid, and the particle size is selected to be less than 0.3 microns.

10. The device for grouting and reinforcing of water-containing fault zone according to claim 2, characterized in that, The polyurethane is AB material, and A material and B material are mixed according to 1:1.

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