Sleeve valve pipe structure, parameter determination method and high-pressure grouting construction process

Abstract

The invention discloses a sleeve valve pipe structure, a parameter determination method and a high-pressure grouting construction technology.The sleeve valve pipe structure comprises sleeve valve pipe units which are connected in a sealed mode, each sleeve valve pipe unit comprises a grouting pipe, and grouting units are evenly arranged on the grouting pipe at intervals in the axial direction; the grouting unit comprises grouting holes evenly formed in the circumference of the grouting pipe, and the grouting pipe is sleeved with an elastic valve skin used for sealing the grouting unit. The grouting pipe is sleeved with at least two centralizing rings, and the outer diameter of the centralizing rings is larger than that of the elastic valve skin. According to the sleeve valve pipe structure, the centralizing rings are additionally arranged on the two sides, corresponding to the elastic valve skin, of the grouting pipe, exclusive protection on the elastic valve skin is formed, direct friction and rubbing between the valve skin and the hole wall are effectively avoided, the replacement frequency of the valve skin in the construction process is greatly reduced, and the construction cost and the construction period delay risk are reduced.

Description

Technical Field

[0001] This invention relates to the field of high-pressure grouting technology. Specifically, it relates to a valve-pipe structure, a method for determining parameters, and a high-pressure grouting construction process. Background Technology

[0002] Valve-pipe grouting is a key technology in geotechnical engineering for seepage prevention and reinforcement, especially widely used in high-precision grouting scenarios such as advanced surface directional drilling and high-pressure grouting. Its core lies in achieving precise grout diffusion and effective soil consolidation through segmented, controllable grouting. The valve skin, as the core unidirectional control element in the valve-pipe system, directly determines the grouting pressure increase range and the stability of the project quality. This valve skin must simultaneously perform three core functions: automatically opening during the grouting pressurization stage to ensure smooth grout flow, automatically closing under pressure to prevent grout backflow, and achieving a reliable seal to prevent grout blockage, thereby maintaining the construction independence of each independent grouting section.

[0003] However, in existing high-pressure grouting processes using valve casing, the valve skin is susceptible to wear and tear during the lowering of the casing due to dimensional deviations and its own geometric parameters, resulting in continuous friction with the borehole wall. Simultaneously, the high-pressure environment and chemical corrosion of the grout further exacerbate the degradation of the valve skin's sealing performance, potentially leading to seal failure. Therefore, a valve casing structure, parameter determination method, and high-pressure grouting construction process are needed that can be applied to high-pressure grouting in advanced surface directional drilling and prevent valve casing seal failure during construction. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a sleeve valve pipe structure, parameter determination method and high-pressure grouting construction process that can be applied to high-pressure grouting of advanced surface directional drilling and can avoid the failure of sleeve valve pipe sealing during construction.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A sleeve valve tube structure includes sleeve valve tube units that are sealed and connected to each other. Each sleeve valve tube unit includes a grouting pipe. Grouting units are evenly spaced along the axial direction on the grouting pipe. Each grouting unit includes grouting holes evenly arranged along the circumference of the grouting pipe. An elastic valve skin for sealing the grouting unit is sleeved on the grouting pipe.

[0007] At least two straightening rings are fitted on the grouting pipe. The outer diameter of the straightening rings is larger than the outer diameter of the elastic valve skin, so that during the lowering of the valve pipe structure, the inner wall of the borehole only contacts the outer surface of the straightening rings and cannot touch the elastic valve skin, thereby avoiding the elastic valve skin from being damaged by friction from the inner wall of the borehole.

[0008] In the above-mentioned sleeve valve tube structure, a straightening ring is provided on each side of each elastic valve skin, so that every two straightening rings protect one elastic valve skin;

[0009] The width of the straightening ring is at least 2.5 mm, and its outer diameter is at least 5 mm larger than the outer diameter of the elastic valve skin. The straightening ring is made of 304 stainless steel.

[0010] In the aforementioned sleeve valve pipe structure, the grouting pipe has an annular groove corresponding to the arrangement position of the grouting unit, the grouting hole is arranged in the annular groove, the width of the annular groove is at least twice the diameter of the grouting hole, the elastic valve skin is installed in the annular groove to seal the grouting hole, the thickness of the elastic valve skin matches the depth of the annular groove, and the width of the elastic valve skin matches the width of the annular groove.

[0011] A method for determining the parameters of a sleeve valve tube structure is provided. The method aims to enable the sleeve valve tube structure to operate continuously under a high pressure environment of 15MPa and to achieve precise control of the grouting pressure. This is achieved by optimizing and matching the thickness, material, and opening diameter of the elastic valve skin of the sleeve valve tube structure.

[0012] The method includes the following steps:

[0013] Step S1: Determine the target pressure range;

[0014] Step S2: Conduct orthogonal tests on the thickness, material, and grouting hole diameter of the elastic valve skin;

[0015] Step S3: Select the optimal combination of factors based on the experimental results.

[0016] In the above-mentioned method for determining the parameters of a sleeve valve tube structure, the specific process of determining the target pressure range in step S1 is as follows: a pressure test of the entire annular cavity of the sleeve valve tube structure is used for verification. The sleeve valve tube structure is completely placed into the pressure chamber and the annular cavity formed between the outer wall of the sleeve valve tube structure and the inner wall of the pressure chamber is sealed. External pressure is applied to the annular cavity. The pressure resistance state of the sleeve valve tube structure during the pressure process is used to determine whether it is suitable for the preset target pressure range, thereby determining the appropriate high-pressure grouting pressure range.

[0017] The method for determining the parameters of the aforementioned valve tube structure, in step S1, includes the following specific steps for conducting orthogonal experiments:

[0018] Step S2-1: Determine the variables and levels for the orthogonal experiment;

[0019] The material of the elastic valve skin is set at 2 levels, namely black EPDM rubber and red EPDM rubber; the thickness of the elastic valve skin is set at 3 levels, namely 3mm, 4mm and 5mm; the opening diameter of the grouting hole is set at 3 levels, namely 3mm, 6mm and 10mm.

[0020] Step S2-2, using L 18 (2¹×3 7 A mixed-level orthogonal array design experiment was used, with 18 experimental combinations configured.

[0021] Step S2-3: Perform pressure tests on the sleeve and tube structure of each test combination using a dedicated pressure resistance test device. According to the pressure range determined in step S1, gradually increase the pressure from the lowest pressure to the highest pressure, and record the last pressure before the elastic valve skin is punctured. This pressure is the pressure resistance pressure corresponding to the test combination.

[0022] The specific process of step S3 is as follows: Based on the analysis of the test data, the test combination with a thickness of 4mm for the elastic valve skin, a material of black EPDM rubber, and a grouting hole opening diameter of 6mm is finally selected as the optimal combination.

[0023] A high-pressure grouting construction process, based on the above-mentioned valve tube structure, includes the following steps:

[0024] Step P1: Drill directional holes in the construction area to form grouting holes that meet the preset hole diameter and depth requirements;

[0025] Step P2: Deploy the sleeve valve tube structure into the grouting hole in sections, and divide the inside of the sleeve valve tube structure into multiple grouting sections to complete the grouting section pre-setting;

[0026] Step P3: Lower the blocker through the sleeve valve tube structure to the bottommost target grouting section, and seal and isolate the grouting section to form a single independent grouting space;

[0027] Step P4: Start the high-pressure grouting pump to grout the isolated grouting section until the grouting volume reaches the preset grouting volume for a single section;

[0028] Step P5: After the grouting volume of this section reaches the standard, turn off the high-pressure grouting pump and lift the blocker up to the grouting section immediately above the bottom grouting section to isolate and seal this section.

[0029] Step P6: Repeat steps P4 and P5 to complete the grouting operation for all preset grouting sections from bottom to top.

[0030] In the above-mentioned high-pressure grouting construction process, in step P1, the pre-set borehole diameter is at least 20mm larger than the outer diameter of the grouting pipe of the sleeve valve pipe structure, so as to fill the sleeve material between the sleeve valve pipe structure and the inner wall of the borehole.

[0031] In the above-mentioned high-pressure grouting construction process, in step P4, when the grouting pressure reaches the threshold of the elastic valve skin, the elastic valve skin undergoes elastic deformation under pressure, and the grout is ejected from the grouting hole of the grouting section, and the grouting pressure is kept higher than the threshold of the elastic valve skin until the grouting volume of the section reaches the standard.

[0032] A pressure sensor for real-time monitoring of grouting pressure is installed in the grouting pipeline. The pressure sensor signal is connected to a PLC controller, which is electrically connected to the high-pressure grouting pump. The PLC controller has a preset grouting pressure threshold range and can automatically adjust the operating parameters of the high-pressure grouting pump according to the real-time pressure signal fed back by the pressure sensor, so as to achieve stable control of grouting pressure and ensure the quality of grouting construction.

[0033] In the above-mentioned high-pressure grouting construction process, in step P5, after the high-pressure grouting pump is turned off, the elastic valve automatically closes, sealing the grouting unit again.

[0034] The technical solution of the present invention achieves the following beneficial technical effects:

[0035] The valve tube structure of this application adds a centralizing ring to both sides of the elastic valve skin corresponding to the grouting pipe, forming a dedicated protection for the elastic valve skin. The centralizing ring is made of high-strength, corrosion-resistant 304 stainless steel, with a stable structure that is not easily deformed, and can adapt to the harsh working conditions in complex geological boreholes. During the lowering process, the centralizing ring acts as a contact and load-bearing component between the grouting pipe and the borehole wall, maintaining a safe distance between the elastic valve skin and the borehole wall, effectively preventing direct friction and scratching between the valve skin and the borehole wall, while also preventing debris such as gravel and rock cuttings in the borehole from impacting and scratching the valve skin. This fundamentally avoids the problem of valve skin damage during lowering. Verification has shown that the centralizing ring can ensure the long-term integrity of the elastic valve skin, significantly reducing the frequency of valve skin replacement during construction, and reducing construction costs and the risk of project delays.

[0036] The parameter determination method of this application, through orthogonal experiments on the thickness and material of the elastic valve skin and the opening diameter of the grouting hole, determined the optimal combination of a 4mm thick black EPDM rubber material and a 6mm grouting hole opening diameter. This solved the technical problems of grouting seal failure, grout leakage, and inability to close backflow after pressure relief caused by valve skin damage. Actual verification showed that the sleeve valve pipe structure using this combination can work stably for more than 100 hours under high pressure of 15MPa, meeting the pressure requirements of high-pressure grouting for advanced surface directional drilling and ensuring the smooth progress of grouting operations. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of a sleeve valve tube unit according to the present invention;

[0038] Figure 2 for Figure 1 A cross-sectional view of the AA plane;

[0039] Figure 3 for Figure 2 Enlarged view of section B;

[0040] Figure 4 for Figure 2 A sectional view of the C-plane;

[0041] Figure 5 for Figure 4 Enlarged view of section D in the middle;

[0042] Figure 6 The figure shows the test results of the 3mm grouting hole in the parameter determination method of the valve tube structure of the present invention.

[0043] Figure 7 The figure shows the test results of the 6mm grouting hole in the parameter determination method of the valve tube structure of the present invention;

[0044] Figure 8 This is a diagram showing the test results of a 10mm grouting hole in a method for determining the parameters of a sleeve valve pipe structure according to the present invention.

[0045] The reference numerals in the figure are: 1-grouting pipe; 2-grouting hole; 3-elastic valve skin; 4-straightening ring. Detailed Implementation

[0046] Example 1: This example discloses a sleeve valve tube structure, such as... Figures 1 to 3 As shown, the system includes a valve tube unit that is sealed and connected to each other. Each valve tube unit includes a grouting pipe 1, on which grouting units are evenly spaced along the axial direction. Each grouting unit includes grouting holes 2 evenly arranged along the circumference of the grouting pipe 1. An elastic valve skin 3 is fitted onto the grouting pipe 1 to seal the grouting unit. The grouting pipe 1 is made of seamless steel pipe with an outer diameter of 133mm, an inner diameter of 117mm, and a wall thickness of 16mm. The length of the steel pipe can be customized according to actual engineering needs. The interval between the grouting units is 1.5m, meaning that a group of grouting units is set every 1.5m along the axial direction of the grouting pipe 1. Each group of grouting units includes 6 grouting holes 2, which are evenly distributed along the circumference of the grouting pipe 1. The circumferential angle between adjacent grouting holes 2 is 60 degrees. The grouting holes 2 are precisely machined using a CNC drilling machine to ensure a smooth and burr-free orifice.

[0047] At least two centering rings 4 are fitted onto the grouting pipe 1. The outer diameter of the centering ring 4 is larger than the outer diameter of the elastic valve skin 3, so that during the lowering of the valve pipe structure, the inner wall of the borehole only contacts the outer surface of the centering ring 4 and cannot touch the elastic valve skin 3, thereby preventing the elastic valve skin 3 from being damaged by friction from the inner wall of the borehole. Furthermore, as... Figure 4 and Figure 5 As shown, a straightening ring 4 is provided on each side of each elastic valve skin 3, so that every two straightening rings 4 protect one elastic valve skin 3.

[0048] The width of the centering ring 4 is at least 2.5 mm, and its outer diameter is 138 mm, which is at least 5 mm larger than the outer diameter of the elastic valve skin 3. The outer diameter of the elastic valve skin 3 is the same as the outer diameter of the grouting pipe 1. The centering ring 4 is made of 304 stainless steel. Furthermore, the centering ring 4 also serves to assist in centering the grouting pipe 1, keeping it centered during lowering, preventing it from tilting or getting stuck, reducing the difficulty of lowering the pipe, and improving lowering efficiency.

[0049] like Figure 3 As shown, the grouting pipe 1 has an annular groove corresponding to the grouting unit's placement position. The grouting hole 2 is located within the annular groove, and the width of the annular groove is at least twice the diameter of the grouting hole 2. The elastic valve skin 3 is installed within the annular groove to seal the grouting hole 2. The thickness of the elastic valve skin 3 matches the depth of the annular groove, and the width of the elastic valve skin 3 matches the width of the annular groove. This ensures that the outer surface of the elastic valve skin 3 is flush with the outer surface of the grouting pipe 1. Combined with two straightening rings 4, this effectively protects the elastic valve skin 3. The depth of the annular groove and the thickness of the elastic valve skin 3 are both 5mm.

[0050] Example 2: A method for determining the parameters of a sleeve valve tube structure, used to determine the parameters of the sleeve valve tube structure. In order to enable the sleeve valve tube structure to operate continuously under a high pressure environment of 15MPa and to achieve precise control of the grouting pressure, the thickness, material, and opening diameter of the elastic valve skin 3 of the sleeve valve tube structure are optimized and matched.

[0051] The method includes the following steps:

[0052] Step S1: Determine the target pressure range. Specifically, the process for determining the target pressure range is as follows: a pressure test of the entire annular cavity of the sleeve valve tube structure is used for verification. The sleeve valve tube structure is completely placed into the pressure chamber and the annular cavity formed between the outer wall of the sleeve valve tube structure and the inner wall of the pressure chamber is sealed. External pressure is applied to the annular cavity. The pressure resistance of the sleeve valve tube structure during the pressure process is used to determine whether it is suitable for the preset target pressure range, thereby determining the appropriate high-pressure grouting pressure range.

[0053] Step S2: Conduct orthogonal tests on the thickness and material of the elastic valve skin 3 and the opening diameter of the grouting hole 2; specifically including the following sub-steps:

[0054] Step S2-1: Determine the variables and levels for the orthogonal experiment;

[0055] The material of the elastic valve skin 3 is set to 2 horizontally, namely black EPDM rubber and red EPDM rubber; the thickness of the elastic valve skin 3 is set to 3 horizontally, namely 3mm, 4mm and 5mm; the opening diameter of the grouting hole 2 is set to 3 horizontally, namely 3mm, 6mm and 10mm.

[0056] Step S2-2, using L 18 (2¹×3 7 A mixed-level orthogonal array design experiment was used, with 18 experimental combinations configured.

[0057] Step S2-3: Conduct pressure tests on the valve tube structure of each test combination using a dedicated pressure testing device. According to the pressure range determined in step S1, gradually increase the pressure from the lowest pressure to the highest pressure and observe whether the valve skin is punctured by the pressure. If no puncture occurs, continue to increase the pressure and record the pressure in real time until puncture occurs. Record the puncture pressure and the number of puncture holes. The pressure recorded last before puncture is the pressure resistance corresponding to the parameters of this test group.

[0058] The experimental results of step S3 and the 18 test combinations are as follows: Figures 6 to 8As shown in the figure, the black rubber is black EPDM rubber, and the red rubber is red EPDM rubber. Based on the test results, the performance of different rubber materials can be determined. Combined with the diameter of the steel pipe opening, to meet the requirements of high-precision horizontal segmented high-pressure grouting for pre-grouting in ground directional drilling to ensure the quality of the grouting curtain, and considering that a larger opening diameter in the sealing steel pipe results in a faster grout flow rate and reduces the likelihood of clogging, the optimal combination was selected: a 4mm thick elastic valve skin 3 made of black EPDM rubber, and a 6mm opening diameter for the grouting hole 2. This combination provides a guarantee for subsequent retractable continuous grouting using a plug. Black EPDM rubber has excellent corrosion resistance, wear resistance, and aging resistance, enabling it to withstand long-term use under complex geological conditions. Actual use has verified that this combined casing valve structure can operate for over 100 hours under a high pressure of 15MPa. Furthermore, this application achieves the engineering requirements for high-pressure grouting under complex geological conditions through optimized structural design and scientific parameter matching. It is particularly suitable for high-pressure grouting reinforcement of adverse geological sections such as faults and fracture zones, effectively ensuring grouting quality and construction efficiency.

[0059] Example 3, a high-pressure grouting construction process, implemented based on the valve pipe structure described in Example 1, includes the following steps:

[0060] Step P1: Drill directional holes in the construction area to form grouting holes that meet the preset hole diameter and depth requirements; the preset hole diameter is at least 20mm larger than the outer diameter of the grouting pipe 1 of the sleeve valve pipe structure, so as to fill the sleeve material between the sleeve valve pipe structure and the inner wall of the hole.

[0061] Step P2: The sleeve valve tube structure is lowered into the grouting hole in sections, and multiple grouting sections are divided axially inside the sleeve valve tube structure to complete the pre-setting of grouting sections; each sleeve valve tube unit is connected by threads and sealed, and during the lowering process of the sleeve valve tube structure, the straightening ring 4 effectively avoids contact between the elastic valve skin 3 and the borehole wall, ensuring the integrity of the sealing performance of the sleeve valve tube structure.

[0062] Step P3: Lower the blocker through the sleeve valve tube structure to the bottommost target grouting section, and seal and isolate the grouting section to form a single independent grouting space;

[0063] Step P4: Start the high-pressure grouting pump to grout the isolated grouting section until the grouting volume reaches the preset grouting volume for a single section; gradually increase the grouting pressure. When the grouting pressure reaches the threshold of the elastic valve skin 3 (the threshold of the elastic valve skin 3 is 15MPa), the elastic valve skin 3 undergoes elastic deformation under pressure, and the grout is ejected from the grouting hole 2 of the grouting section. Maintain the grouting pressure above the threshold of the elastic valve skin 3, generally maintaining the grouting pressure at 15-18MPa, until the grouting volume of the section meets the standard.

[0064] Step P5: After the grouting volume of this section reaches the standard, turn off the high-pressure grouting pump and lift the blocker up to the grouting section above the bottommost grouting section to isolate and seal this section; after turning off the high-pressure grouting pump, the pressure is released, and the elastic valve skin 3 automatically closes to seal the grouting unit again.

[0065] Step P6: Repeat steps P4 and P5 to complete the grouting operation for all preset grouting sections from bottom to top.

[0066] In addition, a pressure sensor for real-time monitoring of grouting pressure is installed in the grouting pipeline. The pressure sensor can be installed at any location on the grouting pipeline capable of accurately measuring the grouting pressure. Preferably, the pressure sensor is installed on the connection joint between the grouting pipe 1 and the high-pressure grouting pump. Specifically, the pressure sensor is a pressure gauge. The grouting pipe 1 and the high-pressure grouting pump are connected via a tee joint. The first port of the tee joint is connected to the outlet of the high-pressure grouting pump, the second port is connected to the inlet of the grouting pipe 1, and the third port is connected to the pressure gauge. The pressure sensor signal is connected to a PLC controller, which is electrically connected to the high-pressure grouting pump. The PLC controller has preset target pressure values ​​and upper and lower pressure safety limits for each grouting section. During grouting, the PLC... The controller receives real-time pressure signals from pressure sensors and compares them with the preset target pressure for the corresponding grouting section. It then automatically adjusts the operating parameters of the high-pressure grouting pump. Specifically, when the real-time pressure is lower than the target pressure, the output pressure of the grouting pump is increased to compensate for the pressure drop. When the real-time pressure reaches or exceeds the safety limit, the grouting pump stops working. When the real-time pressure stabilizes within the target range, the current operating parameters of the grouting pump are maintained to ensure that the grouting pressure of each section is accurate and controllable, ensuring the grouting density and the safety of the valve pipe structure, thereby achieving the standard of grouting quality throughout the entire process.

[0067] The above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A sleeve valve pipe structure, characterized in that, The device includes a sleeve valve tube unit that is sealed to each other. The sleeve valve tube unit includes a grouting pipe (1). Grouting units are evenly spaced along the axial direction on the grouting pipe (1). The grouting unit includes grouting holes (2) evenly arranged along the circumference of the grouting pipe (1). An elastic valve skin (3) for sealing the grouting unit is sleeved on the grouting pipe (1). At least two straightening rings (4) are fitted on the grouting pipe (1). The outer diameter of the straightening ring (4) is larger than the outer diameter of the elastic valve skin (3) so that during the lowering of the valve pipe structure, the inner wall of the borehole only contacts the outer surface of the straightening ring (4) and cannot touch the elastic valve skin (3), thereby avoiding the elastic valve skin (3) from being damaged by friction from the inner wall of the borehole.

2. The sleeve valve tube structure according to claim 1, characterized in that, Each elastic valve skin (3) is provided with a straightening ring (4) on both sides, so that every two straightening rings (4) protect one elastic valve skin (3); The width of the straightening ring (4) is at least 2.5 mm, and its outer diameter is at least 5 mm larger than that of the elastic valve skin (3). The straightening ring (4) is made of 304 stainless steel.

3. The sleeve valve tube structure according to claim 1, characterized in that, The grouting pipe (1) has an annular groove at the location of the grouting unit. The grouting hole (2) is located in the annular groove. The width of the annular groove is at least twice the diameter of the grouting hole (2). The elastic valve skin (3) is installed in the annular groove to seal the grouting hole. The thickness of the elastic valve skin (3) matches the depth of the annular groove, and the width of the elastic valve skin (3) matches the width of the annular groove.

4. A method for determining the parameters of a sleeve valve tube structure, wherein the sleeve valve tube structure is the sleeve valve tube structure according to any one of claims 1-3, characterized in that, In order to enable the sleeve valve tube structure to operate continuously under a high pressure environment of 15MPa and to achieve precise control of grouting pressure, the thickness and material of the elastic valve skin (3) of the sleeve valve tube structure and the opening diameter of the grouting hole (2) are optimized and matched. The method includes the following steps: Step S1: Determine the target pressure range; Step S2: Conduct an orthogonal test on the thickness and material of the elastic valve skin (3) and the opening diameter of the grouting hole (2); Step S3: Select the optimal combination of factors based on the experimental results.

5. The method for determining the parameters of a sleeve valve pipe structure according to claim 4, characterized in that, In step S1, the specific process of determining the target pressure range is as follows: a pressure test of the entire annular cavity of the sleeve valve tube structure is used for verification. The sleeve valve tube structure is completely placed into the pressure chamber and the annular cavity formed between the outer wall of the sleeve valve tube structure and the inner wall of the pressure chamber is sealed. External pressure is applied to the annular cavity. The pressure resistance state of the sleeve valve tube structure during the pressure process is used to determine whether it is suitable for the preset target pressure range, thereby determining the appropriate high-pressure grouting pressure range.

6. The method for determining the parameters of a sleeve valve pipe structure according to claim 4, characterized in that, Step S2, the specific process of conducting the orthogonal experiment includes the following steps: Step S2-1: Determine the variables and levels for the orthogonal experiment; The material of the elastic valve skin is set to 2 levels, namely black EPDM rubber and red EPDM rubber; the thickness of the elastic valve skin (3) is set to 3 levels, namely 3mm, 4mm and 5mm; the opening diameter of the grouting hole (2) is set to 3 levels, namely 3mm, 6mm and 10mm. Step S2-2, using L 18 (2¹×3 7 A mixed-level orthogonal array design experiment was used, with 18 experimental combinations configured. Step S2-3: Perform pressure tests on the sleeve valve tube structure of each test combination using a dedicated pressure resistance test device. According to the pressure range determined in step S1, gradually increase the pressure from the lowest pressure to the highest pressure and record the last pressure before the elastic valve skin (3) is broken. This pressure is the pressure resistance pressure corresponding to the test combination. The specific process of step S3 is as follows: Based on the analysis of the test data, the test combination with a thickness of 4mm for the elastic valve skin (3), a material of black EPDM rubber, and an opening diameter of 6mm for the grouting hole (2) is finally selected as the optimal combination.

7. A high-pressure grouting construction process, implemented based on the sleeve valve pipe structure according to any one of claims 1-3, characterized in that, Includes the following steps: Step P1: Drill directional holes in the construction area to form grouting holes that meet the preset hole diameter and depth requirements; Step P2: Deploy the sleeve valve tube structure into the grouting hole in sections, and divide the inside of the sleeve valve tube structure into multiple grouting sections to complete the grouting section pre-setting; Step P3: Lower the blocker through the sleeve valve tube structure to the bottommost target grouting section, and seal and isolate the grouting section to form a single independent grouting space; Step P4: Start the high-pressure grouting pump to grout the isolated grouting section until the grouting volume reaches the preset grouting volume for a single section; Step P5: After the grouting volume of this section reaches the standard, turn off the high-pressure grouting pump and lift the blocker up to the grouting section immediately above the bottom grouting section to isolate and seal this section. Step P6: Repeat steps P4 and P5 to complete the grouting operation for all preset grouting sections from bottom to top.

8. The high-pressure grouting construction process according to claim 7, characterized in that, In step P1, the borehole diameter is at least 20 mm larger than the outer diameter of the grouting pipe (1) of the valve tube structure, so as to fill the space between the valve tube structure and the inner wall of the borehole with casing material.

9. The high-pressure grouting construction process according to claim 7, characterized in that, In step P4, when the grouting pressure reaches the threshold of the elastic valve skin (3), the elastic valve skin (3) undergoes elastic deformation under pressure, and the grout is ejected from the grouting hole (2) of the grouting section, and the grouting pressure is kept higher than the threshold of the elastic valve skin (3) until the grouting volume of the section meets the standard. A pressure sensor for real-time monitoring of grouting pressure is installed in the grouting pipeline. The pressure sensor signal is connected to a PLC controller, which is electrically connected to the high-pressure grouting pump. The PLC controller has a preset grouting pressure threshold range and can automatically adjust the operating parameters of the high-pressure grouting pump according to the real-time pressure signal fed back by the pressure sensor, so as to achieve stable control of grouting pressure and ensure the quality of grouting construction.

10. The high-pressure grouting construction process according to claim 7, characterized in that, In step P5, after the high-pressure grouting pump is turned off, the elastic valve skin (3) automatically closes, sealing the grouting unit again.

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