Pulping and grouting method and pulping and grouting system

Abstract

The embodiment of the invention discloses a slurrying and grouting method and a slurrying and grouting system, and the slurrying and grouting method comprises the following steps: S1, calculating the theoretical grouting amount according to the size of a target drill hole, the size of an extraction pipe and the parameters of drill hole sealing; s2, the actual grouting amount is calculated according to the theoretical grouting amount; s3, calculating the consumption amount of a sealing material and the consumption amount of water according to the actual grouting amount; s4, mixing and stirring the sealing material with calculated consumption and water to form slurry; and S5, grout is injected into the target drilled hole till the injection amount reaches the actual grouting amount or the grouting pressure reaches the preset pressure. According to the slurrying and grouting method and the slurrying and grouting system, the calculated consumption of the sealing material and the calculated consumption of the water are mixed, the prepared slurry is reasonable in proportion and accurate in quality, by controlling the actual grouting amount or grouting pressure, when the prepared slurry is injected into the to-be-sealed section of the drill hole, the grouting sealing quality can be guaranteed, and the grouting quality is improved. And the gas extraction effect is improved.

Description

Technical Field

[0001] This invention relates to the field of gas extraction technology, and in particular to a grouting method and grouting system. Background Technology

[0002] Methane gas is a major hazard threatening safe production in coal mines, but it is also an important clean energy source. To effectively prevent and control methane disasters and realize its resource utilization, coal mines commonly employ underground borehole extraction technology. In this technology, the quality of the borehole grouting and sealing directly determines the airtightness and negative pressure stability of the extraction system, and is a core factor affecting the concentration and efficiency of methane extraction.

[0003] In related technologies, downhole drilling grouting construction relies on manual operation, where workers use simple mixing tanks and grouting pumps to prepare and inject the grout. Obviously, this operation relies on the experience of the workers, and the ratio of grouting material to water and the amount of grout injected cannot be precisely controlled. This easily leads to problems such as unreasonable grout preparation and difficulty in controlling grouting quality, ultimately resulting in inconsistent borehole sealing quality and affecting gas extraction efficiency. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] To this end, in a first aspect, embodiments of the present invention propose a grouting method, the grouting method comprising the following steps: S1: calculating the theoretical grouting volume based on the size of the target borehole, the size of the extraction pipe, and the parameters of the borehole sealing; S2: calculating the actual grouting volume based on the theoretical grouting volume; S3: calculating the consumption of sealing material and water based on the actual grouting volume; S4: mixing and stirring the calculated consumption of the sealing material and the water to form a slurry; S5: injecting the slurry into the target borehole until the injection volume reaches the actual grouting volume or the grouting pressure reaches a predetermined pressure.

[0006] The grouting method of this invention calculates the consumption of sealing material and water based on the size of the target borehole, the size of the extraction pipe, and the parameters of borehole sealing. By mixing the calculated consumption of sealing material and water, the grout prepared has a reasonable ratio and precise quality. By controlling the actual grouting volume or grouting pressure, when the prepared grout is injected into the section of the borehole to be sealed, the quality of grouting and sealing can be guaranteed, and the effect of gas extraction can be improved.

[0007] In some embodiments, in step S1, according to the formula: V=π*{(D / 2)} 2 -(d / 2) 2}*l, calculate the theoretical grouting volume, where V is the theoretical grouting volume, D is the diameter of the target borehole, d is the diameter of the extraction pipe, and l is the length of the section to be sealed in the target borehole; according to the formula: M1=V*ρ, calculate the theoretical grouting volume, where M1 is the theoretical grouting volume and ρ is the grout density.

[0008] In some embodiments, in step S2, the actual grouting volume is calculated according to the formula: M2=M1*a, where M2 is the actual grouting volume and a is the grouting coefficient.

[0009] In some embodiments, in step S3, the consumption of the sealing material is calculated according to the formula: M=(M2*b) / (b+1), and the consumption of water is calculated according to the formula: N=M / b; where M is the consumption of the sealing material, N is the consumption of the water, and b is the mass ratio of the sealing material to the water.

[0010] In some embodiments, during step S4, the viscosity of the slurry is monitored in real time while the sealing material and the water are being stirred, and step S5 is initiated after the viscosity reaches a preset value.

[0011] Secondly, embodiments of the present invention provide a grouting system for implementing any of the above-described grouting methods, comprising: a grouting device for measuring a preset amount of water and mixing and stirring the water with a sealing material, the grouting device for injecting the mixture of water and the sealing material into a target borehole; a weighing device for measuring the amount of sealing material fed and for conveying the sealing material to the grouting device; and a control unit for calculating the consumption of both the sealing material and the water, the control unit being electrically connected to both the weighing device and the grouting device; the control unit being configured to control the weighing device to convey the sealing material to the grouting device when the amount of sealing material fed reaches the calculated consumption; the control unit controlling the grouting device to perform a stirring action; the control unit being configured to control the water to stop being fed to the grouting device when the water reaches the calculated consumption; and the control unit being configured to control the grouting device to start grouting when the mixture reaches a preset viscosity.

[0012] In some embodiments, the grouting device includes: a stirring assembly for containing and stirring the water and the sealing material; a water inlet assembly connected to the stirring assembly for supplying the water to the stirring assembly; and a grouting assembly connected to the stirring assembly for injecting the mixture in the stirring assembly into the target borehole.

[0013] In some embodiments, the stirring assembly includes a stirring container; the grouting device further includes a viscosity sensor disposed in the stirring container for monitoring the viscosity of the mixture within the stirring container; the grouting assembly includes a grouting pipeline and a multi-parameter sensor, the grouting pipeline being connected to the target borehole, and the multi-parameter sensor being disposed in the grouting pipeline for monitoring the flow rate and pressure of the mixture in the grouting pipeline.

[0014] In some embodiments, the weighing device includes: a stand; a plurality of weighing sensors disposed on the stand and spaced apart around a vertical axis; and a hopper disposed on the plurality of weighing sensors.

[0015] In some embodiments, the weighing device further includes: a conveying pipe extending laterally and located below the hopper and above the mixing assembly, the conveying pipe being connected to both the hopper and the mixing assembly; a screw shaft located inside the conveying pipe, the two ends of the screw shaft being rotatably engaged with the two ends of the conveying pipe; and a driving member connected to the screw shaft to drive the screw shaft to rotate around its own axis. Attached Figure Description

[0016] Figure 1 This is a flowchart of the slurry preparation and grouting method according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the slurry preparation and grouting system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the grouting device according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the weighing device according to an embodiment of the present invention; Figure 5 This is a cross-sectional view of the weighing device according to an embodiment of the present invention.

[0017] Figure label: 100. Grouting device; 110. Mixing assembly; 120. Water inlet assembly; 130. Grouting assembly; 140. Viscosity sensor; 150. Fixed platform; 160. Discharge assembly; 170. Cleaning assembly; 111. Mixing container; 112. Mixing component; 121. Water inlet pipeline; 122. Flow sensor; 123. Solenoid three-way valve; 131. Grouting pipeline; 132. Multi-parameter sensor; 133. Pumping component; 200 Weighing device; 210 Frame; 220 Weighing sensor; 230 Hopper; 240 Conveying pipe; 250 Screw shaft; 260 Discharge pipe; 300. Control Unit. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] refer to Figure 1 The grouting method of this invention includes the following steps: S1: Calculate the theoretical grouting volume based on the size of the target borehole, the size of the extraction pipe, and the parameters of the borehole sealing; S2: Calculate the actual grouting volume based on the theoretical grouting volume; S3: Calculate the consumption of sealing material and water based on the actual grouting volume; S4: Mix and stir the calculated consumption of sealing material and water to form a grout; S5: Inject the grout into the target borehole until the injection volume reaches the actual grouting volume or the grouting pressure reaches the predetermined pressure.

[0020] The grouting method of this invention calculates the consumption of sealing material and water based on the size of the target borehole, the size of the extraction pipe, and the parameters of borehole sealing. By mixing the calculated consumption of sealing material and water, the grout prepared has a reasonable ratio and precise quality. By controlling the actual grouting volume or grouting pressure, when the prepared grout is injected into the section of the borehole to be sealed, the quality of grouting and sealing can be guaranteed, and the effect of gas extraction can be improved.

[0021] It should be noted here that the predetermined pressure for the grouting pressure in the borehole to be sealed is selected based on the characteristics of the grouting material and the sealing process, generally ranging from 0.5 MPa to 1.8 MPa. For example, if the predetermined grouting pressure for the borehole to be sealed is 1 MPa, grouting is stopped when the grouting pressure reaches 1 MPa but the grouting volume does not reach the actual grouting volume. Similarly, when the surrounding rock of the borehole has developed fractures, the grouting pressure in the section to be sealed may be difficult to rise to 1 MPa, but grouting is also stopped when the grouting volume reaches the actual grouting volume.

[0022] In some embodiments, in step S1, according to the formula: V=π*{(D / 2)} 2 -(d / 2) 2}*l, calculate the theoretical grouting volume, where V is the theoretical grouting volume, D is the diameter of the target borehole, d is the diameter of the extraction pipe, and l is the length of the section to be sealed in the target borehole; according to the formula: M1=V*ρ, calculate the theoretical grouting volume, where M1 is the theoretical grouting volume and ρ is the grout density.

[0023] In step S2, the actual grouting volume is calculated according to the formula: M2=M1*a, where M2 is the actual grouting volume and a is the grouting coefficient.

[0024] In step S3, the amount of sealing material consumed is calculated according to the formula: M=(M2*b) / (b+1), and the amount of water consumed is calculated according to the formula: N=M / b; where M is the amount of sealing material consumed, N is the amount of water consumed, and b is the mass ratio of sealing material to water.

[0025] Specifically, D, d, l, ρ, a, and b are all existing parameters. Among them, a is determined based on the characteristics of the sealing material and the development of fissures in the surrounding rock of the borehole. Generally, a is taken as 1.3 for expansive cement and 1.1 for phase change gel. When the surrounding rock of the borehole is more developed, the value of a can be appropriately increased. ρ is determined by the density of the sealing material and b.

[0026] During slurry preparation, the above parameters are input into the control unit 300 according to the actual situation. The control unit 300 will automatically calculate the consumption of sealing material and water. Based on the calculation results, the calculated amount of sealing material and water can be weighed. In this way, the ratio of sealing material to water is guaranteed to meet the requirements, and the amount of slurry prepared meets the grouting requirements of the section to be sealed in the borehole.

[0027] In some embodiments, during step S4, the viscosity of the slurry is monitored in real time while the sealing material and water are being stirred, and step S5 is initiated once the viscosity reaches a preset value.

[0028] By monitoring the viscosity of the grout, it is possible to ensure the formation of a uniform and stable grout, preventing abnormalities such as stratification and clumping, and improving the sealing effect of the grout. Moreover, a suitable viscosity ensures that the grout can be smoothly pumped to the deep fractures of the surrounding rock in the borehole and maintain a flowing state for a period of time to complete the grouting, avoiding premature thickening that could lead to pipe blockage or incomplete grouting. This ensures the performance of the sealing grout from the source, providing a fundamental guarantee for the safe and efficient extraction of gas.

[0029] In some embodiments, the injection flow rate and pressure of the slurry are monitored in real time during step S5.

[0030] Flow monitoring ensures continuous and uninterrupted injection, preventing voids caused by insufficient injection. Pressure monitoring reflects formation resistance and grout diffusion in real time; a sudden drop in pressure may indicate grout loss (slurry run-off), while a sharp increase in pressure warns of pipe blockage or complete filling of fractures. The combination of flow and pressure monitoring allows for precise determination of the injection endpoint, ensuring that the grout fully compacts the borehole annular space and surrounding fractures, guaranteeing effective filling and complete sealing.

[0031] refer to Figures 2 to 5This invention also proposes a grouting system for implementing any of the above-mentioned grouting methods, comprising: a grouting device 100, a weighing device 200, and a control unit 300; the grouting device 100 is used to measure a preset amount of water and mix and stir the water with a sealing material, and the grouting device 100 is used to inject the mixture of water and sealing material into the target borehole; the weighing device 200 is used to measure the amount of sealing material fed and to transport the sealing material to the grouting device 100; the control unit 300 is used to calculate the weight of the sealing material and water. The control unit 300 is electrically connected to both the weighing device 200 and the grouting device 100. The control unit 300 is configured to control the weighing device 200 to deliver the sealing material to the grouting device 100 when the amount of sealing material fed reaches the calculated consumption. The control unit 300 controls the grouting device 100 to perform a stirring action. The control unit 300 is configured to control the water to stop being delivered to the grouting device 100 when the amount of water reaches the calculated consumption. The control unit 300 is configured to control the grouting device 100 to start grouting when the mixture reaches the preset viscosity.

[0032] The control unit 300 uses its internal algorithm to calculate the actual grouting volume, sealing material consumption, and water consumption in a single hole. This guides the weighing device 200 to measure the calculated amount of sealing material consumed and the grouting device 100 to measure the calculated amount of water consumed. The control unit 300 controls the weighing device 200 to deliver the sealing material to the grouting device 100 and controls the grouting device 100 to perform a stirring action, achieving the mixing of the sealing material and water to form a grout with the correct proportions. Once the grout viscosity reaches the preset viscosity, the control unit 300 controls the grouting device 100 to inject grout into the borehole until the grouting volume reaches the actual grouting volume or the grouting pressure reaches the predetermined pressure. This achieves quantitative control of the quality of the injected grout, ensuring the effectiveness of the seal.

[0033] In some embodiments, reference is made to Figure 3 The grouting device 100 includes: a mixing assembly 110, a water inlet assembly 120, and a grouting assembly 130; the mixing assembly 110 is used to contain and mix water and sealing material; the water inlet assembly 120 is connected to the mixing assembly 110 and is used to supply water to the mixing assembly 110; the grouting assembly 130 is connected to the mixing assembly 110 and is used to inject the mixture in the mixing assembly 110 into the target borehole.

[0034] Specifically, such as Figure 3As shown, the grouting device 100 also includes a fixed platform 150, which supports the mixing assembly 110, the water inlet assembly 120, and the grouting assembly 130. The mixing assembly 110 mixes and stirs the sealing material and water to form a slurry; the water inlet assembly 120 is connected to the downhole static water pipe and supplies static water to the mixing assembly 110. When the supply volume reaches the calculated water consumption, the water inlet assembly 120 stops supplying water under the control of the control unit 300; when the viscosity of the slurry reaches the preset viscosity, the control unit 300 controls the grouting assembly 130 to start and inject the slurry into the target borehole for sealing.

[0035] The mixing assembly 110, the water inlet assembly 120, and the grouting assembly 130 work together to achieve water delivery, mixing of water and sealing materials, and delivery of grout. All three are controlled by the control unit 300, realizing automated grouting and slurry preparation.

[0036] In some embodiments, reference is made to Figure 3 The stirring assembly 110 includes a stirring container 111 and a stirring component 112; the stirring component 112 is used to stir the material in the stirring container 111. It is understood that the stirring component 112 is an existing structure and will not be described in detail here. The grouting device 100 also includes a viscosity sensor 140, which is located in the stirring container 111 and is used to monitor the viscosity of the mixture in the stirring container 111.

[0037] The weighing device 200 delivers the sealing material into the mixing container 111, and the water inlet assembly 120 delivers water into the mixing container 111. During the water delivery process, the stirring component 112 performs a stirring action simultaneously, so that the water and the sealing material are mixed to form a uniform slurry. During the stirring process, the viscosity sensor 140 monitors the viscosity change of the slurry and transmits the viscosity information to the control unit 300.

[0038] The viscosity sensor 140 monitors the viscosity of the slurry, ensuring the formation of a uniform and stable slurry and preventing abnormalities such as stratification and clumping, thus improving the sealing effect of the slurry. Moreover, the appropriate viscosity ensures that the slurry can be smoothly pumped to the deep fractures of the surrounding rock in the borehole and maintain a flowing state for a period of time to complete the grouting, avoiding premature thickening that could lead to pipe blockage or incomplete grouting. This ensures the performance of the sealing slurry from the source, providing a fundamental guarantee for the safe and efficient extraction of gas.

[0039] In some embodiments, reference is made to Figure 3The water inlet assembly 120 includes a water inlet pipe 121, a flow sensor 122, and a solenoid three-way valve 123. One end of the water inlet pipe 121 is connected to a static pressure water pipe, and the other end is connected to a mixing container 111. The flow sensor 122 is located in the water inlet pipe 121. The solenoid three-way valve 123 is a one-inlet, two-outlet type, with its inlet and one of its outlets (for clarity, this outlet is defined as the first outlet) connected to the water inlet pipe 121.

[0040] During pulping, the control unit 300 controls the inlet of the solenoid three-way valve 123 to connect with the first outlet, and the static pressure water is delivered to the mixing container 111 through the inlet pipe 121. During the delivery process, the flow sensor 122 monitors the amount of water delivered and transmits the delivery information to the control unit 300. When the calculated water consumption is reached, the control unit 300 controls the first outlet to close and stops the water delivery.

[0041] In some embodiments, reference is made to Figure 3 The grouting assembly 130 includes a grouting pipeline 131, a multi-parameter sensor 132, and a pumping component 133; the multi-parameter sensor 132 is located in the grouting pipeline 131, and the pumping component 133 is connected to the mixing container 111 and the grouting pipeline 131.

[0042] Once the viscosity of the grout reaches the required level, the control unit 300 starts the pumping component 133, and the grout is injected into the borehole through the grouting pipeline 131. During the injection process, the multi-parameter sensor 132 monitors the flow rate and pressure of the grout to ensure continuous and uninterrupted injection, guaranteeing effective filling and complete sealing. At the same time, the flow rate and pressure monitoring can reflect abnormal grouting conditions, providing a basis for timely adjustment of the output pressure of the pumping component 133 and accurate determination of the grouting end time.

[0043] In some embodiments, reference is made to Figure 3 The grouting device 100 also includes a liquid discharge assembly 160 and a cleaning assembly 170. The liquid discharge assembly 160 is connected to the mixing container 111 and is used to discharge the liquid in the mixing container 111. The cleaning assembly 170 is connected to the mixing container 111 and another outlet of the electromagnetic three-way valve 123 (for clarity, this outlet is defined as the second outlet).

[0044] After grouting is completed, the drain assembly 160 is opened, and the remaining grout in the mixing container 111 is discharged. The control unit 300 controls the second outlet to open, and static pressure water is sprayed out through the cleaning assembly 170 to clean the mixing container 111, thereby facilitating the next grouting and preventing residual grout from affecting the grout ratio during the next grouting. In addition, during the cleaning process, static pressure water is sprayed into the mixing container 111 again, and the grouting assembly 130 is started, which can also clean the grouting assembly 130.

[0045] In some embodiments, reference is made to Figure 4 and Figure 5 The weighing device 200 includes: a frame 210, multiple weighing sensors 220 and a hopper 230; the multiple weighing sensors 220 are disposed on the frame 210 and are distributed at intervals around a vertical axis; the hopper 230 is disposed on the multiple weighing sensors 220.

[0046] The hopper 230 is used to store dry sealing material. The weighing sensor 220 weighs the amount of sealing material consumed to meet the mixing ratio requirements with water. It should be noted that the number of hoppers 230 is not limited to one, and correspondingly, the number of weighing sensors 220 is not limited to one set. For example, for two or three types of dry sealing material, multiple hoppers 230 can simultaneously weigh various dry sealing materials separately. Furthermore, for cases where the sealing material is liquid, the weighing sensor 220 is replaced by a flow sensor 122, details of which will not be elaborated further.

[0047] In some embodiments, reference is made to Figure 4 and Figure 5 The weighing device 200 also includes: a conveying pipe 240, a screw shaft 250, and a driving component; the conveying pipe 240 extends laterally and is located below the hopper 230 and above the mixing assembly 110, and the conveying pipe 240 is connected to both the hopper 230 and the mixing assembly 110; the screw shaft 250 is located inside the conveying pipe 240, and the two ends of the screw shaft 250 are respectively rotatably engaged with the two ends of the conveying pipe 240; the driving component is connected to the screw shaft 250 to drive the screw shaft 250 to rotate around its own axis.

[0048] The conveying pipe 240, the screw shaft 250, and the drive component work together to convey dry sealing material. Specifically, in conjunction with... Figure 5 As shown, when the mass of the sealing material reaches the calculated consumption amount, the hopper 230 is connected to the conveying pipe 240. The sealing material falls into the conveying pipe 240 under its own gravity. The control unit 300 controls the drive component to start, and the drive component drives the spiral shaft 250 to rotate around its own axis, conveying the sealing material from the left end to the right end of the conveying pipe 240. The right end of the conveying pipe 240 is connected to the discharge pipe 260, which is located directly above the mixing container 111. The lower end of the discharge pipe 260 is connected to the feeding port of the mixing container 111. After the sealing material moves to the right end of the conveying pipe 240, it enters the discharge pipe 260 and then falls into the mixing container 111.

[0049] Understandably, in order to prevent the sealing material fed into the hopper 230 from falling directly into the conveying pipe 240, a gate valve is added between the bottom opening of the hopper 230 and the conveying pipe 240; the driving component can be a motor, which drives the screw shaft 250 to rotate.

[0050] In related technologies, borehole grouting construction has always been dominated by experience and characterized by extensive processes, resulting in inconsistent construction quality. The grouting system of this invention can achieve precise material proportioning during grouting and automation of the grouting process, significantly reducing labor intensity and improving grouting efficiency. Furthermore, this system can be integrated into mobile vehicles or drilling platforms for use in gas drainage borehole grouting construction.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for preparing and injecting grout, characterized in that, Includes the following steps: S1: Calculate the theoretical grouting volume based on the size of the target borehole, the size of the extraction pipe, and the parameters of the borehole sealing. S2: Calculate the actual grouting volume based on the theoretical grouting volume; S3: Calculate the consumption of sealing material and water based on the actual grouting volume; S4: Mix and stir the calculated amount of the sealing material and the water to form a slurry; S5: Inject the grout into the target borehole until the injection volume reaches the actual grouting volume or the grouting pressure reaches the predetermined pressure.

2. The grouting method according to claim 1, characterized in that, In step S1, according to the formula: V=π*{(D / 2) 2 -(d / 2) 2 }*l, calculate the theoretical grouting volume, where V is the theoretical grouting volume, D is the diameter of the target borehole, d is the diameter of the extraction pipe, and l is the length of the section to be sealed in the target borehole; According to the formula: M1 = V * ρ, calculate the theoretical grouting volume, where M1 is the theoretical grouting volume and ρ is the grout density.

3. The grouting method according to claim 2, characterized in that, In step S2, according to the formula: M2 = M1 * a, calculate the actual grouting volume, where M2 is the actual grouting volume and a is the grouting coefficient.

4. The grouting method according to claim 3, characterized in that, In step S3, according to the formula: M = (M² * b) / (b + 1), calculate the consumption of the sealing material according to the formula: N=M / b, calculate the water consumption; Where M is the amount of sealing material consumed, N is the amount of water consumed, and b is the mass ratio of the sealing material to the water.

5. The grouting method according to claim 1, characterized in that, In step S4, while stirring the sealing material and the water, the viscosity of the slurry is monitored in real time. After the viscosity reaches a preset value, step S5 is initiated.

6. A grouting and injection system, characterized in that, For implementing the grouting method as described in any one of claims 1 to 5, comprising: Grouting device (100), the grouting device (100) is used to measure a preset amount of water and mix and stir the water with the sealing material, the grouting device (100) is used to inject the mixture of water and the sealing material into the target borehole; A weighing device (200) is used to measure the amount of the sealing material fed into the device and to transport the sealing material to the grouting device (100). A control unit (300) is used to calculate the consumption of both the sealing material and the water. The control unit (300) is electrically connected to both the weighing device (200) and the grouting device (100). The control unit (300) is configured to control the weighing device (200) to deliver the sealing material to the grouting device (100) when the amount of sealing material fed reaches the calculated consumption. The control unit (300) controls the grouting device (100) to perform a stirring action. The control unit (300) is configured to control the water to stop being delivered to the grouting device (100) when the water reaches the calculated consumption. The control unit (300) is configured to control the grouting device (100) to start grouting when the mixture reaches the preset viscosity.

7. The grouting system according to claim 6, characterized in that, The grouting device (100) includes: A stirring assembly (110) for containing and stirring the water and the sealing material; A water inlet assembly (120) is connected to the stirring assembly (110) and is used to supply water to the stirring assembly (110); Grouting assembly (130), which is connected to the mixing assembly (110), is used to inject the mixture in the mixing assembly (110) into the target borehole.

8. The grouting system according to claim 7, characterized in that, The stirring assembly (110) includes a stirring container (111); The grouting device (100) also includes a viscosity sensor (140), which is located in the stirring container (111) and is used to monitor the viscosity of the mixture in the stirring container (111). The grouting assembly (130) includes a grouting pipeline (131) and a multi-parameter sensor (132). The grouting pipeline (131) is used to communicate with the target borehole. The multi-parameter sensor (132) is located in the grouting pipeline (131) and is used to monitor the flow rate and pressure of the mixture in the grouting pipeline (131).

9. The grouting system according to claim 6, characterized in that, The weighing device (200) includes: Frame (210); Multiple weighing sensors (220) are provided on the upright frame (210) and are spaced apart around a vertical axis. A hopper (230) is provided on a plurality of the weighing sensors (220).

10. The slurry preparation and grouting system according to claim 9, characterized in that, The weighing device (200) further includes: A conveying pipe (240) extends laterally and is located below the hopper (230) and above the mixing assembly (110). The conveying pipe (240) is connected to both the hopper (230) and the mixing assembly (110). A spiral shaft (250) is located inside the conveying pipe (240), and the two ends of the spiral shaft (250) are respectively rotatably engaged with the two ends of the conveying pipe (240); A driving component is connected to the helical shaft (250) to drive the helical shaft (250) to rotate about its own axis.

Images