Preparation method and device of Anshan basalt stratum grouting material

Abstract

The invention discloses a preparation method and device of an Anshan basalt stratum grouting material, and relates to the technical field of grouting. Primarily stirring the slurry; shearing and dispersing at high speed; performance detection; and a grouting step. According to the invention, the superfine fly ash microbeads, silica fume and nano-silica are compounded, and a high-speed shearing process is adopted, so that the particle size of the slurry is remarkably reduced, the flowability of the slurry is improved, and the slurry can be smoothly injected into micro cracks of anshan basalt; the main component Portland cement clinker has the characteristics of early strength and micro-expansion; the filling effect of the secondary components silica fume and nano-silica further compacts the structure of the stone body, so that the stone body has high later strength and tight cohesiveness with bedrock; under the synergistic effect of a small amount of hydroxypropyl methyl cellulose and nano silicon dioxide, segregation and bleeding of the slurry are effectively prevented, and it is ensured that the slurry is fully filled in cracks.

Description

Technical Field

[0001] This invention relates to the field of strength testing technology, and in particular to a method and apparatus for preparing grouting materials for andesitic basalt formations. Background Technology

[0002] Andesitic basalt is a common igneous rock, characterized by its dense and brittle structure. Its strata typically exhibit well-developed microfractures, fractured rock masses, and significant anisotropy. In engineering projects such as water conservancy and hydroelectric tunnels, railway and highway tunnels, and slope protection, this type of stratum is highly susceptible to engineering geological problems such as leakage and collapse. Grouting reinforcement is a crucial technical means to address these issues. Its core principle is to use suitable grouting materials to fill rock fissures, thereby improving the integrity and impermeability of the strata.

[0003] Currently, ordinary silicate cement-based grouting materials are mainly used for grouting fractured rock masses. However, the application of ordinary cement grouting in andesitic basalt microfractured formations presents the following problems: (1) The particles are relatively coarse and difficult to inject into micro-cracks (<0.2mm); (2) The slurry has poor stability, is prone to segregation and bleeding, and does not fill the cracks completely; (3) The bond strength between the stone body and the andesitic basalt is insufficient and may shrink, forming new seepage channels; (4) The setting time is relatively long and the early strength is low, which affects the construction efficiency.

[0004] While existing technologies employ ultrafine cement or chemical grouting for improvement, ultrafine cement is expensive, and chemical grouting presents challenges such as poor environmental friendliness, durability, and even higher costs. Therefore, developing a specialized grouting material that combines high permeability, high grouting strength, good durability, and moderate cost is of great significance for the safe and efficient management of andesitic basalt formations. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method and apparatus for preparing grouting materials for andesitic basalt formations.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A method for preparing a grouting material for andesitic basalt formations includes the following steps: S1: Dry powder premix: Weigh 40-60 parts by weight of silicate cement clinker, 20-30 parts by weight of fly ash microspheres, 10-20 parts by weight of silica fume and 5-10 parts by weight of nano silica, place them in a double cone mixer, and dry mix for 20-30 minutes at a speed of 15-25 rpm to obtain a uniform dry mix. S2: Initial mixing of slurry: Add the dry mixture obtained in step S1, 0.5 to 1.5 parts by weight of polycarboxylate superplasticizer, 0.1 to 0.5 parts by weight of hydroxypropyl methylcellulose viscosity modifier, and a total of 17.5 to 22.5 parts by weight of water to a cement slurry mixer, and mix at a low speed of 60±10 rpm for 3 to 5 minutes to form the basic slurry; S3: High-speed shear dispersion: Add the remaining 17.5 to 22.5 parts of water to the base slurry obtained in step S2, switch the mixer to the high-speed setting of 120±20 rpm, and continue stirring for 8 to 12 minutes; then, perform high-speed shear dispersion at a speed of 3000 to 5000 rpm for 5 to 8 minutes to obtain the final grouting material; S4: Performance testing: The viscosity and flowability of the grouting material obtained in step S3 are tested; S5: Grouting: Grouting is carried out after the performance test is qualified.

[0007] The grouting material prepared by it is suitable for fracture reinforcement of andesitic basalt strata. Its initial viscosity ranges from 80 to 120 mPa·s, and the 28-day compressive strength of the grout body is not less than 35 MPa.

[0008] A device for preparing grouting material for andesitic basalt formations includes a base frame, a mixing section located above the base frame for stirring and high-speed dispersing and shearing the grouting material, and a grouting section located below the base frame for grouting the finished grouting material. The outlet of the mixing section is connected to the inlet of the grouting section.

[0009] Based on the aforementioned scheme: the mixing unit includes a mixing tank and a lid fixed to the top of the mixing tank. A mixing shaft is rotatably connected to the axis of the lid. The outer wall of the mixing shaft located inside the mixing tank is provided with multiple mixing plates for halving. The top outer wall of the lid is provided with a drive mechanism for driving the mixing shaft. At the same time, a feeding port for feeding materials and which can be opened and closed is provided on one side of the lid.

[0010] A preferred embodiment of the aforementioned scheme is as follows: the stirring shaft component includes a hollow shaft and a limiting plate axially slidably connected to the inner wall of the hollow shaft; the stirring plate component includes a connecting shaft and a stirring plate fixed to the outer wall of the connecting shaft; a bushing is fixed to the side wall of the hollow shaft; the limiting plate is rotatably and sealed to the inner wall of the bushing; a connecting plate is fixed to the end of the stirring plate located inside the hollow shaft; a limiting rod is fixed to one side of the outer wall of the connecting plate; and a strip hole is opened on the inner wall of the limiting plate to cooperate with the limiting rod in a movable limiting manner; a bucket lid is provided on one or both sides of the stirring plate.

[0011] As a further aspect of the present invention: the driving mechanism includes a permanent magnet and an electromagnet that cooperate with each other. The permanent magnet is fixed to the top outer wall of the limiting plate, and the electromagnet is fixed to the top outer wall of the bucket lid by an "L"-shaped frame. A spring is fastened to the bottom outer wall of the limiting plate, and the other end of the spring is fastened to the bottom inner wall of the hollow shaft.

[0012] Meanwhile, the drive mechanism also includes an electric motor, which is fixed to the top outer wall of the bucket lid by bolts. A second bevel gear is fixed to the outer wall of the output shaft of the electric motor, and a first bevel gear that meshes with the second bevel gear is fixed to the outer wall of the hollow shaft.

[0013] As a preferred embodiment of the present invention: a generator rotor core is fixed to the outer wall of the output shaft of the motor, a generator stator winding is fitted to the outer wall of the generator rotor core, the generator stator winding is fixed to the side wall of the "L"-shaped frame, and the output terminal of the generator stator winding is electrically connected to the input terminal of the electromagnet.

[0014] Meanwhile, the grouting unit includes a reciprocating drive, a piston, and a cylinder. The cylinder is fixed to the inner wall of the base frame, and the piston is slidably connected to the inner wall of the cylinder. The inlet of the piston is connected to a connecting pipe, and the other end of the connecting pipe is connected to the outlet of the mixing tank through a valve channel. A baffle plate is slidably connected to the inner wall of the valve channel. An expansion joint is fixed to the side wall of the base frame by bolts, and the extension end of the expansion joint is fixed to the end of the baffle plate. A one-way valve is connected to the outlet of the cylinder. A reciprocating drive is fixed to one outer wall of the base frame through a U-shaped frame, and the reciprocating motion end of the reciprocating drive is connected to the piston.

[0015] As a preferred embodiment of the present invention: the side wall of the piston is fixed with the cylinder body 2, the inner wall of the cylinder body 2 is slidably connected with the piston 2, the piston 2 is fixed to the reciprocating motion end of the reciprocating drive, and a connecting port communicating with the inside of the cylinder body 2 is provided on one side of the cylinder body 2. The telescopic device is a pneumatic telescopic rod, and the connecting port is connected to the rodless cavity of the telescopic device through a hose.

[0016] The beneficial effects of this invention are as follows: 1. This invention, by compounding ultrafine fly ash microspheres, silica fume, and nano-silica, and employing a high-speed shearing process, significantly reduces the particle size of the slurry, enabling it to be smoothly injected into the micro-fractures of andesitic basalt. Furthermore, silicate cement clinker provides early strength and micro-expansion characteristics, while the pozzolanic effect and filling effect of silica fume and nano-silica further densify the rock structure, giving it high later-stage strength and tight bonding with the bedrock. At the same time, the synergistic effect of hydroxypropyl methylcellulose and nano-silica effectively prevents slurry segregation and bleeding, ensuring full filling of the fractures.

[0017] 2. This invention, by setting up components such as stirring plates and stirring shafts, can achieve low-speed stirring and high-speed shearing operations by utilizing the magnitude of the current of the electromagnet and the rotation speed of the motor, thereby integrating the two processes, simplifying the process, and improving efficiency.

[0018] 3. This invention utilizes the combination of an electromagnet and a permanent magnet to drive the state change of the stirring plate. The electrical energy input of the electromagnet comes from the generator stator winding. At the same time, the generator stator winding and the generator rotor core work together to synchronize the electrical energy output with the motor speed. Thus, by simply controlling the motor speed, the state switching between low-speed stirring and high-speed shearing can be achieved, simplifying the control logic.

[0019] 4. In this invention, by setting up components such as a reciprocating driver, piston one, and cylinder one, the reciprocating motion of piston one can realize the pressurized injection of grouting material, thereby integrating the grouting function into the device and further increasing the integration of the device and the concentration of the process.

[0020] 5. This invention, by setting up components such as a telescopic device, cylinder two, cylinder two baffle plate, and valve channel, can enable the baffle plate to move autonomously according to the change in the force direction of the reciprocating drive on piston one. This ensures the sealing of the mixing tank during the stirring and shearing dispersion process, meets the functional requirements of the "one-way valve" during the grouting process, and also increases the synchronous linkage of the device. Attached Figure Description

[0021] Figure 1 This is a schematic flowchart of a method for preparing grouting material for andesitic basalt formations proposed in this invention. Figure 2 This is a schematic diagram of the overall structure of a grouting material preparation device for andesitic basalt formations proposed in this invention. Figure 3 This is a schematic diagram of the mixing section of a device for preparing grouting materials for andesitic basalt formations according to the present invention. Figure 4 This is a schematic diagram of the stirring plate and stirring shaft of the preparation device for grouting material in andesitic basalt formations proposed in this invention. Figure 5 This is a cross-sectional schematic diagram of the drive mechanism of the device for preparing grouting materials for andesitic basalt formations proposed in this invention; Figure 6 This is a schematic cross-sectional view of the grouting section of a device for preparing grouting materials for andesitic basalt formations according to the present invention. Figure 7 This invention provides a device for preparing grouting materials for andesitic basalt formations. Figure 6 Enlarged structural diagram of section A.

[0022] In the diagram: 1. Base frame; 2. Mixing section; 3. Grouting section; 4. Mixing tank; 5. Feed inlet; 6. Tank lid; 7. Drive mechanism; 8. Mixing plate; 9. Mixing shaft; 10. Hollow shaft; 11. Limiting plate; 12. Strip hole; 13. Limiting rod; 14. Bushing; 15. Mixing plate; 16. Cutting blade; 17. Connecting shaft; 18. Connecting plate; 19. Bevel gear one; 20. Permanent magnet; 21. Electric... 21. Magnet; 22. "L"-shaped frame; 23. Bevel gear II; 24. Generator stator winding; 25. Generator rotor core; 26. Electric motor; 27. Expansion joint; 28. "U"-shaped frame; 29. ​​Reciprocating drive; 30. Spring; 31. Piston I; 32. Cylinder I; 33. One-way valve; 34. Connecting pipe; 35. Baffle plate; 36. Valve passage; 37. Piston II; 38. Cylinder II; 39. Connecting nozzle. Detailed Implementation

[0023] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] Example 1: A method and apparatus for preparing grouting material for andesitic basalt formations, such as... Figure 1 As shown, it includes the following steps: S1: Dry powder premix: Weigh 40-60 parts by weight of silicate cement clinker, 20-30 parts by weight of fly ash microspheres, 10-20 parts by weight of silica fume and 5-10 parts by weight of nano silica, place them in a double cone mixer, and dry mix for 20-30 minutes at a speed of 15-25 rpm to obtain a uniform dry mix. S2: Initial mixing of slurry: Add the dry mixture obtained in step S1, 0.5-1.5 parts by weight of polycarboxylate superplasticizer, 0.1-0.5 parts by weight of hydroxypropyl methylcellulose viscosity modifier, and a total of 17.5-22.5 parts by weight of water to a cement slurry mixer, and mix at a low speed of 60±10 rpm for 3-5 minutes to form the basic slurry; S3: High-speed shear dispersion: Add the remaining 17.5-22.5 parts of water to the base slurry obtained in step S2, switch the mixer to the high-speed setting of 120±20 rpm, and continue stirring for 8-12 minutes; then, perform high-speed shear dispersion at a speed of 3000-5000 rpm for 5-8 minutes to obtain the final grouting material; S4: Performance testing: The viscosity and flowability of the grouting material obtained in step S3 are tested; S5: Grouting: Grouting is carried out after the performance test is qualified.

[0026] This grouting material is suitable for reinforcing fractures in andesitic basalt formations. Its initial viscosity ranges from 80 to 120 mPa·s, and the 28-day compressive strength of the grouting body is not less than 35 MPa.

[0027] This invention significantly reduces the particle size of the slurry by compounding ultrafine fly ash microspheres, silica fume, and nano-silica, and employing a high-speed shearing process. This allows the slurry to be smoothly injected into the micro-fractures of andesitic basalt. Furthermore, silicate cement clinker provides early strength and micro-expansion characteristics, while the pozzolanic effect and filling effect of silica fume and nano-silica further densify the rock structure, giving it high later-stage strength and tight adhesion to the bedrock. At the same time, the synergistic effect of hydroxypropyl methylcellulose and nano-silica effectively prevents slurry segregation and bleeding, ensuring full filling of the fractures.

[0028] Example 2: A device for preparing grouting materials for andesitic basalt formations, such as... Figure 2-7 As shown, it includes a base frame 1, a mixing and blending section 2 for stirring and high-speed dispersing and shearing the grouting material and disposed above the base frame 1, and a grouting section 3 for grouting the finished grouting material and disposed below the base frame 1. The outlet of the mixing and blending section 2 is connected to the inlet of the grouting section 3.

[0029] The mixing unit 2 includes a mixing tank 4 and a lid 6 fixed to the top of the mixing tank 4. A stirring shaft 9 is rotatably connected to the axis of the lid 6. The outer wall of the stirring shaft 9 located inside the mixing tank 4 is provided with a plurality of stirring plates 8 for halving. The top outer wall of the lid 6 is provided with a drive mechanism 7 for driving the stirring shaft 9. At the same time, a feeding port 5 for feeding materials and which can be opened and closed is provided on one side of the top of the lid 6.

[0030] The stirring shaft component 9 includes a hollow shaft 10 and a limiting plate 11 axially slidably connected to the inner wall of the hollow shaft 10. The stirring plate component 8 includes a connecting shaft 17 and a stirring plate 15 fixed to the outer wall of the connecting shaft 17. A bushing 14 is fixed to the side wall of the hollow shaft 10. The limiting plate 117 is rotatably connected to the inner wall of the bushing 14 in a sealed manner. A connecting plate 18 is fixed to the end of the stirring plate 15 located inside the hollow shaft 10. A limiting rod 13 is fixed to one side of the outer wall of the connecting plate 18. A strip hole 12 is opened on the inner wall of the limiting plate 11 to cooperate with the limiting rod 13 in a movable limiting manner. A bucket cover 6 is provided on one or both sides of the stirring plate 15.

[0031] The driving mechanism 7 includes a permanent magnet 20 and an electromagnet 21 that cooperate with each other. The permanent magnet 20 is fixed to the top outer wall of the limiting plate 11, and the electromagnet 21 is fixed to the top outer wall of the bucket lid 6 through an "L"-shaped frame 22. A spring 30 is fastened to the bottom outer wall of the limiting plate 11, and the other end of the spring 30 is fastened to the bottom inner wall of the hollow shaft 10.

[0032] The drive mechanism 7 also includes a motor 26, which is fixed to the top outer wall of the bucket cover 6 by bolts. A bevel gear 23 is fixed to the outer wall of the output shaft of the motor 26, and a bevel gear 19 that meshes with the bevel gear 23 is fixed to the outer wall of the hollow shaft 10.

[0033] The output shaft of the motor 26 is fixed with a generator rotor core 25. The outer wall of the generator rotor core 25 is fitted with a generator stator winding 24. The generator stator winding 24 is fixed to the side wall of the "L"-shaped frame 22, and the output terminal of the generator stator winding 24 is electrically connected to the input terminal of the electromagnet 21.

[0034] When using this device, dry materials and water can be added through the feeding port 5 of the lid 6. After adding the materials, the feeding port 5 is closed, and then the motor 26 is started at a low speed. The motor 26 drives the hollow shaft 10 to rotate through the bevel gear 23 and bevel gear 19, thereby driving the limiting plate 11 and the stirring plate 15 to rotate. At this time, because the speed of the motor 26 is low, the induced electromotive force generated by the electromagnetic cooperation between the generator rotor core 25 and the generator stator winding 24 is relatively small, resulting in a relatively small magnetic field of the electromagnet 21. The magnetic attraction force generated by the electromagnet 21 and the permanent magnet 20 is insufficient to deform the spring 30 or can only cause a slight deformation of the spring 30. The limiting plate 11 is located at the bottom. Alternatively, it may move slightly upwards. At this time, due to the cooperation between the strip hole 12 and the limiting rod 13, the stirring plate 15 is in a vertical or slightly tilted state. When the stirring is finished and step S3 is required, the control motor 26 is started at high speed, which drives the stirring plate 15 to rotate at high speed. At the same time, the induced electromotive force generated in the generator stator winding 24 will increase, which will greatly increase the attraction between the electromagnet 21 and the permanent magnet 20. The limiting plate 11 moves upwards against the tension of the spring 30, and then drives the connecting shaft 17 and the stirring plate 15 to rotate through the cooperation of the strip hole 12 and the limiting rod 13, so that the stirring plate 15 rotates to a horizontal state. The high-speed rotation of the stirring plate 15 enables the cutting blade 16 to perform high-speed shearing.

[0035] This device, by setting up components such as stirring plate 8 and stirring shaft 9, can realize low-speed stirring and high-speed shearing operations by utilizing the current of electromagnet 21 and the rotation speed of motor 26, thereby integrating the two processes, simplifying the process and improving efficiency.

[0036] In addition, this device uses the cooperation of electromagnet 21 and permanent magnet 20 to drive the state change of stirring plate 15. The electrical energy input of electromagnet 21 comes from generator stator winding 24. At the same time, the cooperation of generator stator winding 24 and generator rotor core 25 realizes the synchronization of electrical energy output with motor speed 26. Thus, the state switching between low-speed stirring and high-speed shearing can be realized by only controlling the speed of motor 26, which simplifies the control logic.

[0037] To solve the grouting problem, such as Figure 6 , 7 As shown, the grouting unit 3 includes a reciprocating drive 29, a piston 31, and a cylinder 32. The cylinder 32 is fixed to the inner wall of the base frame 1. The piston 31 is slidably connected to the inner wall of the cylinder 32. The inlet of the piston 31 is connected to a connecting pipe 34. The other end of the connecting pipe 34 is connected to the outlet of the mixing tank 4 through a valve channel 36. A baffle plate 35 is slidably connected to the inner wall of the valve channel 36. An expansion joint 27 is fixed to the side wall of the base frame 1 by bolts. The telescopic end of the expansion joint 27 is fixed to the end of the baffle plate 35. A one-way valve 33 is connected to the outlet of the cylinder 32. The reciprocating drive 29 is fixed to one side of the outer wall of the base frame 1 through a U-shaped frame 28. The reciprocating end of the reciprocating drive 29 is connected to the piston 31.

[0038] In this embodiment, the specific type of reciprocating drive 29 is not limited. It can be a pneumatic, electric, or hydraulically driven telescopic rod with reciprocating telescopic motion, or a mechanical combination of a crank-slider mechanism. All of the above technologies are existing technologies. Those skilled in the art can select and purchase them as needed. It can only achieve rapid driving of piston 31 to reciprocate about. Since this embodiment has not made any creative effort, it will not be described in detail.

[0039] The piston 31 is fixed to the side wall of the cylinder 38, and the piston 37 is slidably connected to the inner wall of the cylinder 38. The piston 37 is fixed to the reciprocating end of the reciprocating drive 29, and a connecting nozzle 39 communicating with the inside of the cylinder 38 is provided on one side of the cylinder 38. The telescopic device 27 is a pneumatic telescopic rod, and the connecting nozzle 39 is connected to the rodless cavity of the telescopic device 27 through a hose.

[0040] When this device is in use, during the mixing or high-speed shearing of the grouting material, the baffle plate 35 can be manually or otherwise inserted into the valve channel 36 to seal the bottom of the mixing tank 4. After the high-speed shearing is completed and grouting is required, the other side of the one-way valve 33 can be connected to the grouting pipeline, and then the reciprocating actuator 29 can be started to drive the piston 31 to reciprocate. When the reciprocating actuator 29 drives the piston 31 based on... Figure 6When moving to the left, the reciprocating drive 29 exerts pressure on piston 31, which, combined with the resistance of piston 31, causes piston 37 to move to the left side of cylinder 38. A negative pressure is generated inside cylinder 38, which is then transmitted to expansion joint 27 via connector 39. Expansion joint 27 contracts, pulling baffle 35 and opening valve passage 36. Grouting material in mixing tank 4 is drawn into cylinder 32 by gravity and the negative pressure inside cylinder 32, and then the reciprocating drive... The actuator 29 drives piston 31 to move to the right. The reciprocating actuator 29 applies a thrust to piston 31. At this time, since the movement of piston 31 also has resistance, piston 37 will move to the right relative to cylinder 38. The gas in cylinder 38 is squeezed into the rodless chamber of telescopic device 27. Telescopic device 27 extends, so that baffle plate 35 is inserted into the valve passage 36. At the same time, the grouting material in cylinder 32 is squeezed into check valve 33 by piston 31 and sprayed out through grouting pipeline.

[0041] This device, by setting up components such as reciprocating drive 29, piston 31, and cylinder 32, can realize the pressurized injection of grouting material by utilizing the reciprocating motion of piston 31, thereby integrating the grouting function into the device and further increasing the integration of the device and the concentration of the process.

[0042] In addition, by setting up components such as the telescopic device 27, cylinder 2 38, cylinder 2 38 baffle plate 35, and valve channel 36, this device can make the baffle plate 35 move autonomously according to the change in the force direction of the reciprocating drive 29 on the piston 1 31. This ensures the sealing of the mixing tank 4 during the mixing and shearing dispersion process, meets the functional requirements of the "one-way valve" during the grouting process, and also increases the synchronous linkage of the device.

[0043] In this embodiment, dry materials and water can be added through the feeding port 5 of the bucket lid 6. After adding the materials, the feeding port 5 is closed, and then the motor 26 is started at a low speed. The motor 26 drives the hollow shaft 10 to rotate through the bevel gear 23 and bevel gear 19, thereby driving the limiting plate 11 and the stirring plate 15 to rotate. At this time, because the speed of the motor 26 is low, the induced electromotive force generated by the electromagnetic cooperation between the generator rotor core 25 and the generator stator winding 24 is relatively small, resulting in a relatively small magnetic field of the electromagnet 21. The magnetic attraction force generated by the electromagnet 21 and the permanent magnet 20 is insufficient to deform the spring 30 or can only cause the spring 30 to deform slightly. The limiting plate 11 is located at the bottom or slightly moved upward. At this time, due to the cooperation between the strip hole 12 and the limiting rod 13, the stirring plate 15 is in a vertical state or a slightly tilted state. After stirring is completed, step S3 needs to be performed. At this moment, the control motor 26 starts at high speed, which drives the stirring plate 15 to rotate at high speed. At the same time, the induced electromotive force generated in the generator stator winding 24 increases, which greatly increases the attraction between the electromagnet 21 and the permanent magnet 20. The limiting plate 11 moves upward against the tension of the spring 30, and then drives the connecting shaft 17 and the stirring plate 15 to rotate through the cooperation of the strip hole 12UI and the limiting rod 13, so that the stirring plate 15 rotates to a horizontal state. With the high speed rotation of the stirring plate 15, the cutting blade 16 performs high-speed shearing. During the mixing or high-speed shearing of the grouting material, the barrier plate 35 can be manually or otherwise inserted into the valve channel 36 to seal the bottom of the mixing tank 4. When the high-speed shearing is over and grouting is required, the other side of the one-way valve 33 can be connected to the grouting pipeline, and then the reciprocating drive 29 is started to drive the piston 31 to reciprocate. When the reciprocating drive 29 drives the piston 31 based on Figure 6 When moving to the left, the reciprocating drive 29 exerts pressure on piston 31, which, combined with the resistance of piston 31, causes piston 37 to move to the left side of cylinder 38. A negative pressure is generated inside cylinder 38, which is then transmitted to expansion joint 27 via connector 39. Expansion joint 27 contracts, pulling baffle 35 and opening valve passage 36. Grouting material in mixing tank 4 is drawn into cylinder 32 by gravity and the negative pressure inside cylinder 32, and then the reciprocating drive... The actuator 29 drives piston 31 to move to the right. The reciprocating actuator 29 applies a thrust to piston 31. At this time, since the movement of piston 31 also has resistance, piston 37 will move to the right relative to cylinder 38. The gas in cylinder 38 is squeezed into the rodless chamber of telescopic device 27. Telescopic device 27 extends, so that baffle plate 35 is inserted into the valve passage 36. At the same time, the grouting material in cylinder 32 is squeezed into check valve 33 by piston 31 and sprayed out through grouting pipeline.

[0044] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing grouting material for andesitic basalt formations, characterized in that, Includes the following steps: S1: Dry powder premix: Weigh 40-60 parts by weight of silicate cement clinker, 20-30 parts by weight of fly ash microspheres, 10-20 parts by weight of silica fume and 5-10 parts by weight of nano silica, place them in a double cone mixer, and dry mix for 20-30 minutes at a speed of 15-25 rpm to obtain a uniform dry mix. S2: Initial mixing of slurry: Add the dry mixture obtained in step S1, 0.5 to 1.5 parts by weight of polycarboxylate superplasticizer, 0.1 to 0.5 parts by weight of hydroxypropyl methylcellulose viscosity modifier, and a total of 17.5 to 22.5 parts by weight of water to a cement slurry mixer, and mix at a low speed of 60±10 rpm for 3 to 5 minutes to form the basic slurry; S3: High-speed shear dispersion: Add the remaining 17.5 to 22.5 parts of water to the base slurry obtained in step S2, switch the mixer to the high-speed setting of 120±20 rpm, and continue stirring for 8 to 12 minutes; then, perform high-speed shear dispersion at a speed of 3000 to 5000 rpm for 5 to 8 minutes to obtain the final grouting material; S4: Performance testing: The viscosity and flowability of the grouting material obtained in step S3 are tested; S5: Grouting: Grouting is carried out after the performance test is qualified.

2. The method for preparing a grouting material for andesitic basalt formations according to claim 1, characterized in that, The grouting material prepared by it is suitable for reinforcing fractures in andesitic basalt formations. Its initial viscosity ranges from 80 to 120 mPa·s, and the 28-day compressive strength of the grouting body is not less than 35 MPa.

3. A device for preparing grouting material for andesitic basalt formations, used in steps S2, S3, and S5 of the method for preparing grouting material for andesitic basalt formations according to claim 1, characterized in that, It includes a base frame (1), a mixing and blending section (2) for mixing and high-speed dispersing and shearing of grouting materials and located above the base frame (1), and a grouting section (3) for grouting finished grouting materials and located below the base frame (1). The outlet of the mixing and blending section (2) is connected to the inlet of the grouting section (3).

4. The apparatus for preparing grouting material for andesitic basalt formations according to claim 3, characterized in that, The mixing unit (2) includes a mixing tank (4) and a lid (6) fixed to the top of the mixing tank (4). A stirring shaft (9) is rotatably connected to the axis of the lid (6). The outer wall of the stirring shaft (9) located inside the mixing tank (4) is provided with a plurality of stirring plates (8) for halving. The top outer wall of the lid (6) is provided with a driving mechanism (7) for driving the stirring shaft (9). At the same time, a feeding port (5) for feeding materials and which can be opened and closed is provided on one side of the top of the lid (6).

5. The apparatus for preparing grouting material for andesitic basalt formations according to claim 4, characterized in that, The stirring shaft component (9) includes a hollow shaft (10) and a limiting plate (11) axially slidably connected to the inner wall of the hollow shaft (10). The stirring plate component (8) includes a connecting shaft (17) and a stirring plate (15) fixed to the outer wall of the connecting shaft (17). A bushing (14) is fixed to the side wall of the hollow shaft (10). The limiting plate (11) is rotatably connected to the inner wall of the bushing (14) in a sealed manner. A connecting plate (18) is fixed to the end of the stirring plate (15) located inside the hollow shaft (10). A limiting rod (13) is fixed to one side of the outer wall of the connecting plate (18). A strip hole (12) is opened on the inner wall of the limiting plate (11) to cooperate with the limiting rod (13) in a movable limiting manner. A bucket cover (6) is provided on one or both sides of the stirring plate (15).

6. The apparatus for preparing grouting material for andesitic basalt formations according to claim 5, characterized in that, The drive mechanism (7) includes a permanent magnet (20) and an electromagnet (21) that cooperate with each other. The permanent magnet (20) is fixed to the top outer wall of the limiting plate (11), and the electromagnet (21) is fixed to the top outer wall of the bucket lid (6) by an "L"-shaped frame (22). A spring (30) is fastened to the bottom outer wall of the limiting plate (11), and the other end of the spring (30) is fastened to the bottom inner wall of the hollow shaft (10).

7. The apparatus for preparing grouting material for andesitic basalt formations according to claim 6, characterized in that, The drive mechanism (7) also includes an electric motor (26), which is fixed to the top outer wall of the bucket cover (6) by bolts. The output shaft of the electric motor (26) is fixed with a second bevel gear (23), and the outer wall of the hollow shaft (10) is fixed with a first bevel gear (19) that meshes with the second bevel gear (23).

8. The apparatus for preparing grouting material for andesitic basalt formations according to claim 7, characterized in that, The output shaft of the motor (26) is fixed with a generator rotor core (25), and the outer wall of the generator rotor core (25) is fitted with a generator stator winding (24). The generator stator winding (24) is fixed to the side wall of the "L"-shaped frame (22), and the output terminal of the generator stator winding (24) is electrically connected to the input terminal of the electromagnet (21).

9. The apparatus for preparing grouting material for andesitic basalt formations according to claim 3, characterized in that, The grouting section (3) includes a reciprocating drive (29), a piston (31) and a cylinder (32). The cylinder (32) is fixed to the inner wall of the base frame (1). The piston (31) is slidably connected to the inner wall of the cylinder (32). The inlet of the piston (31) is connected to a connecting pipe (34). The other end of the connecting pipe (34) is connected to the outlet of the mixing tank (4) through a valve channel (36). The inner wall of the valve channel (36) is slidably connected to a baffle plate (35). The side wall of the base frame (1) is fixed with a telescopic device (27) by bolts. The telescopic end of the telescopic device (27) is fixed to the end of the baffle plate (35). The outlet of the cylinder (32) is connected to a one-way valve (33). The outer side wall of the base frame (1) is fixed with a reciprocating drive (29) through a "U"-shaped frame (28). The reciprocating motion end of the reciprocating drive (29) is connected to the piston (31).

10. The apparatus for preparing grouting material for andesitic basalt formations according to claim 9, characterized in that, The piston one (31) has a cylinder two (38) fixed on its side wall. The cylinder two (38) has a piston two (37) slidably connected to its inner wall. The piston two (37) is fixed to the reciprocating end of the reciprocating drive (29). A connecting nozzle (39) communicating with the inside of the cylinder two (38) is provided on one side of the cylinder two (38). The telescopic device (27) is a pneumatic telescopic rod. The connecting nozzle (39) is connected to the rodless cavity of the telescopic device (27) through a hose.

Images