Expansive soil moisture dynamic management and control device

Abstract

The invention provides an expansive soil moisture dynamic management and control device, and relates to the technical field of soil moisture management. A plurality of permeation assemblies; and a linkage assembly and a driving assembly. The device has the beneficial effects that when accumulated water is gathered on the ground, water in the upper soil layer is absorbed and discharged through the second permeation pipe on the upper portion, the problem that the air permeability and the water permeability of the upper soil layer are reduced due to expansion of the soil is effectively solved, and meanwhile the absorbed water flows into the first permeation pipe and is used for supplementing water into the lower soil layer; it is guaranteed that when plant roots grow downwards, water is provided for plants; under the condition of much rainwater, moisture in the upper soil layer is absorbed through the second permeation pipe, and the problem that the air permeability and the water permeability of the upper soil layer are reduced due to expansion of the soil is effectively relieved; under the drought condition, the soil of the bottom layer is humidified, water is provided for plant growth, and water absorbed by the soil of the upper layer is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil moisture management, and particularly relates to an expansive soil moisture dynamic control device. BACKGROUND

[0002] Expansive soil is a special kind of cohesive soil that has significant swelling and shrinking properties. When the water content changes, it will swell and shrink in volume. This property is related to the mineral composition of the soil, such as montmorillonite and illite, which have strong water absorption and water loss shrinkage. Expansive soil is widely distributed in the natural environment, and in many areas of construction engineering, agricultural planting and other fields, challenges brought by expansive soil are faced.

[0003] When the expansive soil swells by absorbing water, its structure becomes more compact, resulting in a significant decrease in the permeability and water permeability of the upper soil. This has a negative impact on biological activities in the soil, such as the survival and reproduction of microorganisms and the respiration of plant roots.

[0004] Existing water management techniques are mostly single, either focusing on drainage or irrigation. In the expansive soil area, a device capable of dynamically controlling water is needed, which can not only drain excess water from the upper soil, but also supplement water to the lower soil to meet the growth needs of plant roots. SUMMARY

[0005] Therefore, in order to solve the above problems existing in the management of expansive soil water, the embodiments of the present application provide an expansive soil moisture dynamic control device.

[0006] The embodiments of the present application provide an expansive soil moisture dynamic control device, which comprises: a main pipe body comprising a horizontal pipe, a first vertical pipe and a second vertical pipe, the horizontal pipe is open at one end and connected to the lower end of the first vertical pipe, the other end of the horizontal pipe is closed and connected to the lower end of the second vertical pipe, and the upper part of the first vertical pipe is provided with an overflow pipe; a plurality of penetration assemblies, each penetration assembly comprising a first penetration pipe, a second penetration pipe, a water pipe joint and a valve body assembly, the water pipe joint is in communication with the outer wall of the horizontal pipe at one end, and the other two ends are connected to the first penetration pipe and the second penetration pipe respectively, the second penetration pipe is located above the first penetration pipe, the valve body assembly comprises a valve core, a guide rod and a first elastic member, the guide rod is arranged in the water pipe joint and arranged along the axis of the first penetration pipe, one end of the guide rod extends into the horizontal pipe and the other end is connected to the valve core, and the first elastic member connects the valve core and the first penetration pipe; A linkage assembly includes a driving rod and a plurality of driving blocks, the driving rod movably arranged in the horizontal pipe and extending out of both ends of the horizontal pipe, each of the driving blocks fixedly arranged on the driving rod, the driving block provided with a tapered surface in contact with the guide rod at one end of the horizontal pipe, the driving rod provided with a push ring and a second elastic member at one end close to the second vertical pipe, the second elastic member arranged between the push ring and the end of the horizontal pipe, the driving rod provided with a sealing end cover at one end close to the opening of the horizontal pipe; and a driving assembly including a telescopic rod and a push block, the telescopic rod arranged in the second vertical pipe, the push block fixedly arranged on the lower end of the telescopic rod, and the push block provided with an inclined surface in contact with the push ring, the push block vertically moving to push the push ring to drive the driving rod to move, so that the sealing end cover is connected or separated from the opening of the first permeation pipe, and each of the driving blocks pushes the guide rod of a valve body assembly to move through the tapered surface, so that the valve core moves between the water pipe joint and the first permeation pipe, thereby connecting or disconnecting the first permeation pipe and the horizontal pipe.

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

[0008] Further, each of the permeation assemblies is arranged symmetrically with respect to the vertical middle surface of the horizontal pipe, and the guide rods of any two symmetric permeation assemblies are in contact with a driving block, respectively.

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

[0010] Further, a clamping member is installed at the connection between the first permeation pipe and the second permeation pipe and the tee joint, the clamping member including an upper clamping seat and a lower clamping hoop, the upper clamping seat provided with a U-shaped upper clamping groove, the opposite sides of the inner wall of the upper clamping groove provided with a rack, the outer sides of the upper clamping seat provided with an arc-shaped guide groove, the lower clamping hoop provided with a U-shaped lower clamping groove, the opposite sides of the lower clamping groove provided with an embedding groove, the bottom of the embedding groove provided with a clamping tooth seat, and the two racks of the upper clamping seat embedded in the two embedding grooves of the lower clamping hoop, respectively, and the two racks clamped by the two clamping tooth seats, respectively, so that the upper clamping groove and the lower clamping groove are folded to tightly hold the connection.

[0011] Further, a sealing ring is arranged on the telescopic rod, and the sealing ring is in extrusion contact with the inner wall of the second vertical pipe.

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

[0013] Further, the first elastic member and the second elastic member are both springs.

[0014] Further, the push block is a triangular block, the pushed ring is located outside the push block, the push block is provided with the inclined surface at one side close to the pushed ring, and the second elastic member is sleeved on the driving rod, one end of the second elastic member is connected with the pushed ring, and the other end of the second elastic member is connected with the end of the horizontal pipeline.

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

[0016] The technical scheme provided by the embodiment of the application has the following beneficial effects: The expansion soil water dynamic control device provided by the application can effectively alleviate the problem that the air permeability and water permeability of the upper layer of soil are reduced due to the expansion of the soil. Under the condition of heavy rain, the telescopic rod is shortened upwards, so that the lower part of the push block at the lower end is in contact with the pushed ring, the driving rod is pushed to move under the action of the second elastic member, so that the larger part of the conical surface of the driving block is in contact with the guide rod, the guide rod pushes the valve core to block the first permeation pipe, and the sealing end cover is separated from the open end of the first permeation pipe, so that the water in the upper layer of soil is absorbed through the second permeation pipe, the water in the second permeation pipe is gathered together, flows into the horizontal pipeline through the water pipe joint, and then flows out through the open end of the horizontal pipeline, so that the excess water in the upper layer of soil is discharged, and the problem that the air permeability and water permeability of the upper layer of soil are reduced due to the expansion of the soil is effectively alleviated. Under drought conditions, the telescopic rod is extended downward, so that the upper part of the push block at the lower end is in contact with the pushed ring, the drive block cone surface is in contact with the guide rod, so that the horizontal pipeline, the first permeation pipe and the second permeation pipe are communicated, and the sealing end cover is connected with the first permeation pipe opening end to be closed; in this way, the water flow is input through the first vertical pipeline, the water flow enters the horizontal pipeline, the first permeation pipe and the second permeation pipe in sequence, the bottom layer of soil is humidified through the first permeation pipe, and water is provided for plant growth; when the water supplement of the bottom layer of soil is completed, the water flow is gathered in the second permeation pipe, until the second permeation pipe is flush with the overflow pipe, and the water flow is discharged through the overflow pipe, so that the upper layer of soil absorbs water is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the expansion soil water dynamic control device; Figure 2 is a partial schematic diagram of the expansion soil water dynamic control device; Figure 3 is a sectional view of the expansion soil water dynamic control device; Figure 4 is an internal structure diagram of the expansion soil water dynamic control device; Figure 5 is a schematic diagram of the drive block; Figure 6 is a schematic diagram of the valve assembly in an open state; Figure 7 is a schematic diagram of the valve assembly in a closed state; Figure 8 is a schematic diagram of the permeation assembly; Figure 9 is a schematic diagram of the clamping piece; Figure 10 is an exploded view of the clamping piece.

[0018] In the figure: 1, horizontal pipeline; 2, first vertical pipeline; 3, second vertical pipeline; 4, first permeation pipe; 5, second permeation pipe; 6, water pipe joint; 7, clamping piece; 8, right-angle elbow; 9, sealing end cover; 10, telescopic rod; 11, overflow pipe; 12, embedding groove; 13, drive rod; 14, drive block; 15, pushed ring; 16, second elastic piece; 17, push block; 18, sealing ring; 19, guide rod; 20, valve core; 21, first elastic piece; 22, cone surface; 23, clamping tooth seat; 24, upper clamping seat; 25, lower clamping hoop; 26, upper clamping groove; 27, guide groove; 28, rack; 29, lower clamping groove. DETAILED DESCRIPTION

[0019] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the embodiments of the present application with reference to the accompanying drawings. The following describes a relatively preferred one of the multiple possible embodiments of the present application, which is intended to provide a basic understanding of the present application, but is not intended to identify key or decisive elements of the present application or to limit the scope of protection.

[0020] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of example embodiments can have different values.

[0021] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.

[0022] It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus once an item is defined in one drawing, it need not be discussed further in subsequent drawings. It is to be understood, however, that the sizes of the components shown in the drawings can not be drawn to scale for ease of description.

[0023] It should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] Reference is made to Figures 1-4 The embodiment of the present application provides an expansive soil moisture dynamic control device, which comprises a main pipe body, multiple permeation assemblies, a linkage assembly and a driving assembly.

[0025] The main pipe body comprises a horizontal pipe 1, a first vertical pipe 2 and a second vertical pipe 3. One end of the horizontal pipe 1 is provided with an opening and is connected with the lower end of the first vertical pipe 2. The other end of the horizontal pipe 1 is provided with a closure and is connected with the lower end of the second vertical pipe 3. The upper part of the first vertical pipe 2 is provided with an overflow pipe 11.

[0026] The horizontal pipeline 1, the first vertical pipeline 2 and the second vertical pipeline 3 are generally plastic pipe bodies and are buried in the expansive soil, wherein the second vertical pipeline 3 and the first vertical pipeline 2 are arranged in parallel and are respectively connected to the two ends of the horizontal pipeline 1 perpendicularly. The upper end of the first vertical pipeline 2 is generally used for connecting a water supply pipeline, and a control valve is installed on the water supply pipeline, so that water can be transported in the horizontal pipeline 1 through the first vertical pipeline 2.

[0027] The number of the infiltration assemblies can be set flexibly according to the actual application scene, and generally, each of the infiltration assemblies is arranged symmetrically with respect to the vertical middle surface of the horizontal pipeline 1 and is arranged at equal intervals along the length direction of the horizontal pipeline 1.

[0028] As shown in Figure 8 Each of the infiltration assemblies comprises a first infiltration pipe 4, a second infiltration pipe 5, a water pipe joint 6 and a valve body assembly. One end of the water pipe joint 6 is in communication with the outer wall of the horizontal pipeline 1, and the other two ends are connected to the first infiltration pipe 4 and the second infiltration pipe 5 respectively. The second infiltration pipe 5 is located above the first infiltration pipe 4. Specifically, the water pipe joint 6 is a tee joint, wherein the outer wall of the horizontal pipeline 1 and the first infiltration pipe 4 are connected to the two horizontal ends of the water pipe joint 6 respectively, and the second infiltration pipe 5 is connected to the vertical end of the water pipe joint 6. The second infiltration pipe 5 is connected to the water pipe joint 6 through a right-angle elbow 8, so that the second infiltration pipe 5 is arranged in parallel above the first infiltration pipe 4.

[0029] The height of the overflow pipe 11 is the same as the height of the second infiltration pipe 5. When the water in the horizontal pipeline 1 reaches the height of the second infiltration pipe 5, the water can be discharged through the overflow pipe 11, so that the upper soil can absorb less water.

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

[0031] As shown in Figures 3-7As shown, the linkage assembly comprises a driving rod 13 and a plurality of driving blocks 14. The driving rod 13 is movably arranged in the horizontal pipe 1 and extends out of both ends of the horizontal pipe 1. The driving rod 13 is arranged along the axis of the horizontal pipe 1. Each driving block 14 is fixedly arranged on the driving rod 13. The driving block 14 is provided with a tapered surface 22 which is in contact with the guide rod 19 at one end of the horizontal pipe 1. When the driving rod 13 moves along the axis of the horizontal pipe 1, the driving block 14 is driven to move along the axis of the horizontal pipe 1, thereby changing the diameter of the contact part of the tapered surface 22 and the guide rod 19, and driving the guide rod 19 to move the valve core 20 towards or away from the first permeation pipe 4. When the tapered surface 22 is in contact with the guide rod 19 at the part with a larger diameter, the valve core 20 is driven to move towards the first permeation pipe 4, and the first elastic member 21 is compressed to block the first permeation pipe 4. When the tapered surface 22 is in contact with the guide rod 19 at the part with a smaller diameter, the valve core 20 is driven to move away from the first permeation pipe 4 under the action of the restoring force of the first elastic member 21, so that the first permeation pipe 4 is in communication with the horizontal pipe 1.

[0032] The number and position of the driving blocks 14 are arranged according to the number and position of the guide rods 19. For example, when each permeation assembly is symmetrically arranged with respect to the vertical middle plane of the horizontal pipe 1, one driving block 14 is arranged between two guide rods 19. The guide rods 19 of any two symmetric permeation assemblies are in contact with one driving block 14, respectively.

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

[0034] The end of the driving rod 13 close to the second vertical pipe 3 is provided with a push ring 15 and a second elastic member 16. The second elastic member 16 is arranged between the push ring 15 and the end of the horizontal pipe 1. The second elastic member 16 can be a spring.

[0035] The driving rod 13 is provided with a sealing end cover 9 close to the opening end of the horizontal pipe 1. The sealing end cover 9 moves with the movement of the driving rod 13, and can close or open the opening end 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] In the case of no conflict, the above-mentioned embodiments and features in the embodiments can be combined with each other. The above-mentioned only is the preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

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 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.

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.

10. The expansive soil moisture dynamic control device as described in claim 1, characterized in that: The height of the overflow pipe is the same as the height of the second permeation pipe.

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