A dynamic moisture control device for expansive soil

Abstract

This invention provides a dynamic moisture control device for expansive soil, relating to the field of soil moisture management technology. It includes: a main pipe; multiple infiltration components; a linkage component; and a drive component. The beneficial effects of this invention are: when water accumulates on the ground, the second infiltration pipe at the top absorbs and drains water from the upper soil layer, effectively alleviating the problem of decreased air and water permeability of the upper soil layer caused by soil expansion. Simultaneously, the absorbed water flows into the first infiltration pipe to replenish water in the lower soil layer, ensuring sufficient moisture for plant roots as they grow downwards; under rainy conditions, the second infiltration pipe absorbs water from the upper soil layer, effectively alleviating the problem of decreased air and water permeability of the upper soil layer caused by soil expansion; under drought conditions, it humidifies the lower soil layer, providing moisture for plant growth and reducing water absorption by the upper soil layer.

Description

Technical Field

[0001] This invention relates to the field of soil moisture management technology, and in particular to a device for dynamic control of moisture in expansive soil. Background Technology

[0002] Expansive soil is a special type of cohesive soil with significant swelling and shrinkage characteristics. It expands and contracts in volume when its water content changes. This property is related to the presence of minerals such as montmorillonite and illite in the soil, which have strong water absorption and shrinkage properties. Expansive soil is widely distributed in the natural environment, and its presence poses challenges to construction projects and agricultural planting in many regions.

[0003] When expansive soil absorbs water and expands, its structure becomes denser, leading to a significant decrease in the air and water permeability of the upper soil layer. This adversely affects soil biological activities, such as the survival and reproduction of microorganisms and the respiration of plant roots.

[0004] Most existing water management technologies are singular, focusing either on drainage or irrigation. In expansive soil areas, a device is needed that can dynamically control water, both draining excess water from the upper soil layer and replenishing water to the lower soil layer to meet the needs of plant root growth. Summary of the Invention

[0005] In view of this, in order to solve the above-mentioned problems in the management of expansive soil moisture, embodiments of the present invention provide a dynamic control device for expansive soil moisture.

[0006] An embodiment of the present invention provides a device for dynamic control of moisture in expansive soil, comprising: The main body includes a horizontal pipe, a first vertical pipe, and a second vertical pipe. One end of the horizontal pipe is open and connected to the lower end of the first vertical pipe, and the other end of the horizontal pipe is closed and connected to the lower end of the second vertical pipe. An overflow pipe is provided at the upper part of the first vertical pipe. Multiple permeation components are provided, each of which includes a first permeation tube, a second permeation tube, a water pipe connector, and a valve body assembly. One end of the water pipe connector is connected to the outer wall of the horizontal pipe, and the other two ends are respectively connected to the first permeation tube and the second permeation tube. The second permeation tube is located above the first permeation tube. The valve body assembly includes a valve core, a guide rod, and a first elastic element. The guide rod is disposed inside the water pipe connector and is arranged along the axis of the first permeation tube. One end of the guide rod extends slidably into the horizontal pipe, and the other end is connected to the valve core. The first elastic element connects the valve core and the first permeation tube. A linkage assembly includes a drive rod and multiple drive blocks. The drive rod is movably disposed inside the horizontal pipe and extends out of both ends of the horizontal pipe. Each drive block is spaced apart and fixed on the drive rod. Each drive block has a tapered surface that contacts one end of the guide rod located in the horizontal pipe. The drive rod has a push ring and a second elastic element at the end near the second vertical pipe. The second elastic element is disposed between the push ring and the end of the horizontal pipe. The drive rod has a sealing end cap at the end near the opening of the horizontal pipe. The device includes a drive assembly comprising a telescopic rod and a push block. The telescopic rod is disposed within the second vertical pipe, and the push block is fixed to the lower end of the telescopic rod. The push block has an inclined surface that contacts the push ring. The vertical movement of the push block can push the push ring through the inclined surface, thereby driving the drive rod to move. This allows the sealing end cap to connect or separate from one end of the opening of the first permeation pipe. Furthermore, each drive block pushes the guide rod of a valve body assembly through the conical surface, causing the valve core to move between the water pipe joint and the first permeation pipe. This allows the first permeation pipe to connect or disconnect from the horizontal pipe.

[0007] Furthermore, the driving block is a conical block with a maximum diameter smaller than the inner diameter of the horizontal pipe.

[0008] Furthermore, each of the permeation components is symmetrically arranged relative to the vertical midpoint of the horizontal pipe, and the guide rods of any two symmetrical permeation components are in contact with a driving block.

[0009] Furthermore, the water pipe connector is a tee, wherein the outer wall of the horizontal pipe and the first permeation pipe are respectively connected to the two horizontal ends of the water pipe connector, and the second permeation pipe is connected to the vertical end of the water pipe connector.

[0010] Furthermore, a snap-fit ​​device is installed at the connection between the first and second permeation pipes and the water pipe connector. The snap-fit ​​device includes an upper snap-fit ​​seat and a lower snap-fit ​​clamp. The upper snap-fit ​​seat has a U-shaped upper snap-fit ​​groove, and toothed racks are provided on opposite sides of the inner wall of the upper snap-fit ​​groove. Arc-shaped guide grooves are provided on both outer sides of the upper snap-fit ​​seat. The lower snap-fit ​​clamp has a U-shaped lower snap-fit ​​groove, and recessed grooves are provided on opposite sides of the lower snap-fit ​​groove. A toothed seat is provided at the bottom of the recessed groove. The two toothed racks of the upper snap-fit ​​seat are respectively embedded in the two recessed grooves of the lower snap-fit ​​clamp. The two toothed racks are respectively clamped by the two toothed seats, thereby closing the upper snap-fit ​​groove and the lower snap-fit ​​groove to tighten the connection.

[0011] Furthermore, a sealing ring is fitted onto the telescopic rod, and the sealing ring is in contact with the inner wall of the second vertical tube by compression.

[0012] Furthermore, the end of the first permeation pipe connected to the water pipe joint is provided with a stepped groove, and one end of the first elastic element is embedded in the stepped groove.

[0013] Furthermore, both the first elastic element and the second elastic element are springs.

[0014] Furthermore, the push block is a triangular block, the push ring is located outside the push block, the push block has the inclined surface on the side near the push ring, and the second elastic element is sleeved on the drive rod, with one end connected to the push ring and the other end connected to the end of the horizontal pipe.

[0015] Furthermore, the height of the overflow pipe is the same as the height of the second permeation pipe.

[0016] The beneficial effects of the technical solutions provided by the embodiments of the present invention are as follows: This invention discloses a dynamic moisture control device for expansive soil. When water accumulates on the ground, a telescopic rod extends downwards, causing the upper part of the push block at its lower end to contact the push ring. This pushes the drive rod to move, causing the smaller diameter part of the conical surface of the drive block to contact the guide rod, thereby connecting the horizontal pipe, the first infiltration pipe, and the second infiltration pipe. The water in the upper soil layer is absorbed and discharged through the upper second infiltration pipe, effectively alleviating the problem of decreased air and water permeability of the upper soil layer caused by soil expansion. At the same time, the absorbed water flows into the first infiltration pipe to replenish the water in the lower soil layer, ensuring that the plant roots provide water for the plant as they grow downwards. Under rainy conditions, the telescopic rod shortens upward so that the lower part of the push block at its lower end contacts the push ring. Under the action of the second elastic element, the drive rod moves so that the larger part of the conical surface of the drive block contacts the guide rod. The guide rod pushes the valve core to block the first permeation pipe and causes the sealing end cap to separate from the opening end of the first permeation pipe. In this way, the water in the upper soil layer is absorbed through the second permeation pipe. The water inside the second permeation pipe gathers together and flows into the horizontal pipe through the water pipe joint, and then flows out through the opening end of the horizontal pipe. This effectively removes excess water from the upper soil layer and alleviates the problem of decreased air permeability and water permeability of the upper soil layer caused by soil expansion. Under arid conditions, the telescopic rod extends downwards, causing the upper part of the push block at its lower end to contact the push ring. This pushes the drive rod to move, causing the smaller diameter part of the drive block's conical surface to contact the guide rod, thus connecting the horizontal pipe, the first infiltration pipe, and the second infiltration pipe. Simultaneously, the drive rod drives the sealing end cap to connect and seal one end of the opening of the first infiltration pipe. Water is then introduced through the first vertical pipe, and the water flows sequentially into the horizontal pipe, the first infiltration pipe, and the second infiltration pipe. The first infiltration pipe humidifies the bottom soil, providing water for plant growth. When the bottom soil is fully hydrated, the water converges inside the second infiltration pipe until it is level with the overflow pipe, and is then discharged through the overflow pipe, thereby reducing water absorption by the upper soil layer. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a dynamic moisture control device for expansive soil according to the present invention; Figure 2 This is a partial schematic diagram of a dynamic moisture control device for expansive soil according to the present invention; Figure 3 This is a cross-sectional view of a dynamic moisture control device for expansive soil according to the present invention; Figure 4 This is an internal structural diagram of a dynamic moisture control device for expansive soil according to the present invention; Figure 5 This is a schematic diagram of the driver block; Figure 6 This is a schematic diagram of the valve assembly in the open state; Figure 7 This is a schematic diagram of the valve assembly in the closed state; Figure 8 This is a schematic diagram of the penetration testing components; Figure 9 This is a schematic diagram of the card connector; Figure 10 This is an exploded view of the connector.

[0018] In the diagram: 1. Horizontal pipe; 2. First vertical pipe; 3. Second vertical pipe; 4. First permeation pipe; 5. Second permeation pipe; 6. Water pipe joint; 7. Clip-on component; 8. Right-angle elbow; 9. Sealing end cap; 10. Telescopic rod; 11. Overflow pipe; 12. Groove; 13. Drive rod; 14. Drive block; 15. Push ring; 16. Second elastic element; 17. Push block; 18. Sealing ring; 19. Guide rod; 20. Valve core; 21. First elastic element; 22. Conical surface; 23. Clamping tooth seat; 24. Upper clamping seat; 25. Lower clamp; 26. Upper clamping groove; 27. Guide groove; 28. Rack; 29. ​​Lower clamping groove. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below with reference to the accompanying drawings. The following description presents a preferred embodiment of the various possible embodiments of the present invention, intended to provide a basic understanding of the invention, but not intended to identify key or decisive elements of the invention or to limit the scope of protection sought.

[0020] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0021] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures. Also, it should be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale.

[0023] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Please refer to Figure 1-4 The present invention provides a dynamic moisture control device for expansive soil, including a main body, multiple permeation components, linkage components, and a drive component.

[0025] The main body includes a horizontal pipe 1, a first vertical pipe 2, and a second vertical pipe 3. One end of the horizontal pipe 1 is open and connected to the lower end of the first vertical pipe 2, and the other end of the horizontal pipe 1 is closed and connected to the lower end of the second vertical pipe 3. An overflow pipe 11 is provided on the upper part of the first vertical pipe 2.

[0026] The horizontal pipe 1, the first vertical pipe 2, and the second vertical pipe 3 are generally made of plastic and are buried in expansive soil. The second vertical pipe 3 and the first vertical pipe 2 are arranged parallel to each other and are respectively perpendicularly connected to the two ends of the horizontal pipe 1. The upper end of the first vertical pipe 2 is generally used to connect to a water supply pipe, which is equipped with a control valve, allowing water to be supplied to the horizontal pipe 1 through the first vertical pipe 2.

[0027] The number of the permeation components can be flexibly set according to the actual application scenario. Generally, each of the permeation components is symmetrically arranged with respect to the vertical midpoint of the horizontal pipe 1, and the permeation components are evenly spaced along the length of the horizontal pipe 1.

[0028] like Figure 8 As shown, each of the permeation components includes a first permeation tube 4, a second permeation tube 5, a water pipe connector 6, and a valve body assembly. One end of the water pipe connector 6 is connected to the outer wall of the horizontal pipe 1, and the other two ends are connected to the first permeation tube 4 and the second permeation tube 5, respectively. The second permeation tube 5 is located above the first permeation tube 4. Specifically, the water pipe connector 6 is a tee, wherein the outer wall of the horizontal pipe 1 and the first permeation tube 4 are respectively connected to the horizontal ends of the water pipe connector 6, and the second permeation tube 5 is connected to the vertical end of the water pipe connector 6. The second permeation tube 5 is connected to the water pipe connector 6 through a right-angle elbow 8, so that the second permeation tube 5 is arranged parallel to and directly above the first permeation tube 4.

[0029] The height of the overflow pipe 11 is the same as the height of the second infiltration pipe 5. When water accumulates in the horizontal pipe 1 to the height of the second infiltration pipe 5, it can be discharged through the overflow pipe 11, which can reduce the absorption of water by the upper soil.

[0030] Each of the water pipe joints 6 is provided with a valve body assembly, which includes a valve core 20, a guide rod 19, and a first elastic element 21. The guide rod 19 is disposed within the water pipe joint 6 and is arranged along the axis of the first permeation pipe 4. One end of the guide rod 19 extends slidably into the horizontal pipe 1, and the other end is connected to the valve core 20. The first elastic element 21 connects the valve core 20 and the first permeation pipe 4. Here, the end of the first permeation pipe 4 connected to the water pipe joint 6 is provided with a stepped groove, and one end of the first elastic element 21 is embedded in the stepped groove. The first elastic element 21 can be a spring.

[0031] like Figure 3-7As shown, the linkage assembly includes a drive rod 13 and multiple drive blocks 14. The drive rod 13 is movably disposed within the horizontal pipe 1, with both ends extending out of the two ends of the horizontal pipe 1. The drive blocks are arranged along the axis of the horizontal pipe 1. Each drive block 14 is spaced apart and fixed to the drive rod 13. Each drive block 14 has a tapered surface 22 that contacts one end of the guide rod 19 located in the horizontal pipe 1. Here, when the drive rod 13 moves axially along the horizontal pipe 1, it will drive the drive blocks 14 to move axially along the horizontal pipe 1, thereby changing the diameter of the portion of the tapered surface 22 that contacts the guide rod 19, thus causing the guide rod 19 to push the valve core 20 toward or away from the first permeation tube 4. When the larger diameter portion of the conical surface 22 contacts the guide rod 19, it pushes the valve core 20 toward the first permeation tube 4, and the first elastic element 21 is compressed, blocking the first permeation tube 4; while when the smaller diameter portion of the conical surface 22 contacts the guide rod 19, under the action of the restoring force of the first elastic element 21, it pushes the valve core 20 away from the first permeation tube 4, so that the first permeation tube 4 is connected to the horizontal pipe 1.

[0032] The number and position of the drive blocks 14 are set according to the number and position of the guide rods 19. For example, when each of the permeation components is symmetrically arranged relative to the vertical midpoint of the horizontal pipe 1, one drive block 14 is set for every two guide rods 19, and the guide rods 19 of any two symmetrical permeation components are in contact with one drive block 14 respectively.

[0033] The drive block 14 is generally selected as a conical block with a maximum diameter smaller than the inner diameter of the horizontal pipe 1. The diameter of the conical block gradually increases towards the second vertical pipe 3.

[0034] The drive rod 13 has a push ring 15 and a second elastic element 16 at one end near the second vertical pipe 3. The second elastic element 16 is disposed between the push ring 15 and the end of the horizontal pipe 1. The second elastic element 16 can be a spring.

[0035] The drive rod 13 is provided with a sealing end cap 9 near the opening of the horizontal pipe 1. The sealing end cap 9 moves with the drive rod 13, which can close or open one end of the opening of the horizontal pipe 1.

[0036] The drive assembly includes a telescopic rod 10 and a push block 17. The telescopic rod 10 is disposed inside the second vertical pipe 3, and the push block 17 is fixed to the lower end of the telescopic rod 10. The push block 17 has an inclined surface that contacts the push ring 15. Specifically, the push block 17 is a triangular block, which is wider at the top and narrower at the bottom. The push ring 15 is located outside the push block 17, and the push block 17 has the inclined surface on the side near the push ring 15. The second elastic element 16 is sleeved on the drive rod 13, with one end connected to the push ring 15 and the other end connected to the end of the horizontal pipe 1.

[0037] In some embodiments, a sealing ring 18 is fitted onto the telescopic rod 10, and the sealing ring 18 is in contact with the inner wall of the second vertical pipe. The telescopic rod 10 extends and retracts, causing the sealing ring 18 to move, thereby achieving a seal between the telescopic rod 10 and the inner wall of the second vertical pipe 3.

[0038] The telescopic rod 10 can extend and retract, causing the push block 17 to move vertically. The vertical movement of the push block 17 can push the push ring 15 through the inclined surface, causing the drive rod 13 to move, so that the sealing end cap 9 is connected or separated from the opening end of the first permeation pipe 4, and each drive block 14 pushes the guide rod 19 of a valve body assembly through the conical surface 22, causing the valve core 20 to move between the water pipe joint 6 and the first permeation pipe 4, thereby connecting or disconnecting the first permeation pipe 4 from the horizontal pipe 1.

[0039] like Figure 8 , 9 As shown in Figure 10, in some embodiments, to ensure the first permeation tube 4 and the second permeation tube 5 are stably fixed, a snap-fit ​​component 7 is installed at the connection between the first permeation tube 4 and the second permeation tube 5 and the water pipe connector 6. The snap-fit ​​component 7 includes an upper snap-fit ​​seat 24 and a lower snap-fit ​​clamp 25. The upper snap-fit ​​seat 24 is provided with a U-shaped upper snap-fit ​​groove 26. The upper snap-fit ​​groove 26 has toothed racks 28 on both opposite sides of its inner wall. The upper snap-fit ​​seat 24 has arc-shaped guide grooves 27 on both outer sides. The lower snap-fit ​​clamp 25 is provided with a U-shaped lower snap-fit ​​groove 29. The lower snap-fit ​​groove 29 has recesses 12 on both opposite sides of its inner wall. The recesses 12 have toothed seats 23 at their bottom. The two toothed racks 28 of the upper snap-fit ​​seat 24 are respectively embedded in the two recesses 12 of the lower snap-fit ​​clamp 25. The two toothed racks 28 are respectively clamped by the two toothed seats 23, thereby closing the upper snap-fit ​​groove 26 and the lower snap-fit ​​groove 29 to tighten the connection. This not only ensures a stable connection between the first permeation tube 4 and the second permeation tube 5, preventing them from falling off, but also simplifies the installation process, requiring no tools.

[0040] The present invention discloses a dynamic moisture control device for expansive soil. When water accumulates on the ground, the telescopic rod 10 extends downward so that the upper part of the push block 17 at its lower end contacts the push ring 15, pushing the drive rod 13 to move so that the smaller diameter part of the conical surface 22 of the drive block 14 contacts the guide rod 19, thereby connecting the horizontal pipe 1, the first infiltration pipe 4, and the second infiltration pipe 5. The water in the upper soil layer is absorbed and discharged through the upper second infiltration pipe 5, effectively alleviating the problem of decreased air permeability and water permeability of the upper soil layer caused by soil expansion. At the same time, the absorbed water flows into the first infiltration pipe 4 to replenish water in the lower soil layer, ensuring that the plant roots are provided with water when they grow downward. Under rainy conditions, the telescopic rod 10 shortens upward so that the lower part of the push block 17 at its lower end contacts the push ring 15. Under the action of the second elastic element 16, the drive rod 13 is pushed to move so that the larger part of the diameter of the conical surface 22 of the drive block 14 contacts the guide rod 19. The guide rod 19 pushes the valve core 20 to block the first infiltration pipe 4 and causes the sealing end cap 9 to separate from the opening end of the first infiltration pipe 4. Thus, the water in the upper soil layer is absorbed through the second infiltration pipe 5. The water inside the second infiltration pipe 5 gathers together and flows into the horizontal pipe 1 through the water pipe joint 6, and then flows out through the opening end of the horizontal pipe 1, thereby realizing the discharge of excess water in the upper soil layer and effectively alleviating the problem of decreased air permeability and water permeability of the upper soil layer caused by soil expansion. Under arid conditions, the telescopic rod 10 extends downwards so that the upper part of the push block 17 at its lower end contacts the push ring 15, pushing the drive rod 13 to move so that the smaller diameter part of the conical surface 22 of the drive block 14 contacts the guide rod 19, thereby connecting the horizontal pipe 1, the first infiltration pipe 4, and the second infiltration pipe 5. At the same time, the drive rod 13 drives the sealing end cap 9 to connect and seal one end of the opening of the first infiltration pipe 4. In this way, water is input through the first vertical pipe 2, and the water flows into the interior of the horizontal pipe 1, the first infiltration pipe 4, and the second infiltration pipe 5 in sequence. The first infiltration pipe 4 humidifies the soil at the bottom layer, providing water for plant growth. When the soil at the bottom layer is full of water, the water flows into the second infiltration pipe 5 until it is level with the overflow pipe 11, and is discharged through the overflow pipe 11, thereby reducing the absorption of water by the upper soil.

[0041] In this document, the directional terms such as front, back, top, and bottom are defined based on the position of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that these are relative concepts and can vary depending on different methods of use and placement; the use of these directional terms should not limit the scope of protection claimed in this application.

[0042] Where there is no conflict, the embodiments and features described above can be combined with each other. The above descriptions are merely preferred embodiments of the present invention and are not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for dynamic moisture control of expansive soil, characterized in that, include: The main body includes a horizontal pipe, a first vertical pipe, and a second vertical pipe. One end of the horizontal pipe is open and connected to the lower end of the first vertical pipe, and the other end of the horizontal pipe is closed and connected to the lower end of the second vertical pipe. An overflow pipe is provided at the upper part of the first vertical pipe. Multiple permeation components are provided, each of which includes a first permeation tube, a second permeation tube, a water pipe connector, and a valve body assembly. One end of the water pipe connector is connected to the outer wall of the horizontal pipe, and the other two ends are respectively connected to the first permeation tube and the second permeation tube. The second permeation tube is located above the first permeation tube. The valve body assembly includes a valve core, a guide rod, and a first elastic element. The guide rod is disposed inside the water pipe connector and is arranged along the axis of the first permeation tube. One end of the guide rod extends slidably into the horizontal pipe, and the other end is connected to the valve core. The first elastic element connects the valve core and the first permeation tube. A linkage assembly includes a drive rod and multiple drive blocks. The drive rod is movably disposed inside the horizontal pipe and extends out of both ends of the horizontal pipe. Each drive block is spaced apart and fixed on the drive rod. Each drive block has a tapered surface that contacts one end of the guide rod located in the horizontal pipe. The drive rod has a push ring and a second elastic element at the end near the second vertical pipe. The second elastic element is disposed between the push ring and the end of the horizontal pipe. The drive rod has a sealing end cap at the end near the opening of the horizontal pipe. The device includes a drive assembly comprising a telescopic rod and a push block. The telescopic rod is disposed within the second vertical pipe, and the push block is fixed to the lower end of the telescopic rod. The push block has an inclined surface that contacts the push ring. The vertical movement of the push block can push the push ring through the inclined surface, thereby driving the drive rod to move. This allows the sealing end cap to connect or separate from one end of the horizontal pipe opening. Each drive block pushes the guide rod of a valve body assembly through the conical surface, thereby driving the valve core to move between the water pipe joint and the first permeation pipe, thus connecting or disconnecting the first permeation pipe from the horizontal pipe. The height of the overflow pipe is the same as the height of the second permeation pipe; When the telescopic rod extends downwards, the driving rod causes the sealing end cap to connect and seal with one end of the horizontal pipe opening, while simultaneously connecting the first permeation tube to the horizontal pipe; when the telescopic rod retracts upwards, the driving rod causes the sealing end cap to separate from one end of the horizontal pipe opening, while simultaneously disconnecting the first permeation tube from the horizontal pipe.

2. The expansive soil moisture dynamic control device as described in claim 1, characterized in that: The drive block is a conical block with a maximum diameter smaller than the inner diameter of the horizontal pipe.

3. The expansive soil moisture dynamic control device as described in claim 1, characterized in that: Each of the permeation components is symmetrically arranged relative to the vertical midpoint of the horizontal pipe, and the guide rods of any two symmetrical permeation components are in contact with a driving block.

4. The expansive soil moisture dynamic control device as described in claim 1, characterized in that: The water pipe joint is a tee, wherein the outer wall of the horizontal pipe and the first permeation pipe are respectively connected to the two horizontal ends of the water pipe joint, and the second permeation pipe is connected to the vertical end of the water pipe joint.

5. The expansive soil moisture dynamic control device as described in claim 4, characterized in that: A snap-fit ​​device is installed at the connection between the first and second permeation pipes and the water pipe joint. The snap-fit ​​device includes an upper snap-fit ​​seat and a lower snap-fit ​​clamp. The upper snap-fit ​​seat has a U-shaped upper snap-fit ​​groove, and toothed racks are provided on both opposite sides of the inner wall of the upper snap-fit ​​groove. Arc-shaped guide grooves are provided on both outer sides of the upper snap-fit ​​seat. The lower snap-fit ​​clamp has a U-shaped lower snap-fit ​​groove, and recessed grooves are provided on both opposite sides of the lower snap-fit ​​groove. A toothed seat is provided at the bottom of the recessed groove. The two toothed racks of the upper snap-fit ​​seat are respectively embedded in the two recessed grooves of the lower snap-fit ​​clamp. The two toothed racks are respectively clamped by the two toothed seats, thereby closing the upper snap-fit ​​groove and the lower snap-fit ​​groove to tighten the connection.

6. The expansive soil moisture dynamic control device as described in claim 1, characterized in that: A sealing ring is fitted on the telescopic rod, and the sealing ring is in contact with the inner wall of the second vertical tube by compression.

7. The expansive soil moisture dynamic control device as described in claim 1, characterized in that: The first permeation tube has a stepped groove at one end where it connects to the water pipe joint, and one end of the first elastic member is embedded in the stepped groove.

8. The expansive soil moisture dynamic control device as described in claim 1, characterized in that: Both the first elastic element and the second elastic element are springs.

9. The expansive soil moisture dynamic control device as described in claim 1, characterized in that: The push block is a triangular block, the push ring is located outside the push block, the push block has an inclined surface on the side near the push ring, and the second elastic element is sleeved on the drive rod, with one end connected to the push ring and the other end connected to the end of the horizontal pipe.

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