Drainage device for saline-alkali soil treatment

Abstract

The drainage device comprises a water collection assembly, a water collection main pipe of the water collection assembly is of a hollow tubular structure, a water pumping pipe is arranged at the axis position in the water collection main pipe, and a water suction assembly connected with the bottom of the water pumping pipe is used for pumping deep-layer high-salinity underground water; and the soil salt-containing water collected and flowing in from the water collecting main pipe is synchronously extracted. Through collaborative design of the water collecting assembly, the expansion assembly, the water pumping pipe, the adsorption assembly and the like, efficient treatment of saline-alkali soil deep and shallow layer salt-containing water is achieved, water collecting holes of the water collecting main pipe are matched with permeation holes of the expandable expansion branch pipes, a three-dimensional water collecting network is formed, the water collecting range is expanded, and the water collecting effect is improved. Shallow soil leaching water and deep underground water can be collected at the same time, the problem that the water collecting range of a traditional vertical pipe is limited is solved, the water pumping pipe is located in the water collecting main pipe, the whole device greatly improves the soil salt removal rate, and the device is suitable for ecological restoration and agricultural improvement of saline-alkali soil.

Description

Technical Field

[0001] The invention relates to the technical field of saline-alkali land treatment, in particular to a drainage device used for saline-alkali land treatment. Background Art

[0002] In the field of saline-alkali land improvement technology, the drainage system is a key link in reducing soil salinity and improving the soil environment. At present, the commonly used technical means for saline-alkali land management is to vertically insert vertical pipes into the saline-alkali land, and use irrigation to encourage soil moisture to carry salt into the vertical pipes, and then use external pumps to pump out the salty water. This method uses vertical pipes to construct drainage channels to achieve the initial removal of salt in saline-alkali land, which is one of the basic technologies for saline-alkali land improvement.

[0003] In saline-alkali land management, vertical pipe drainage is a common technique for reducing soil salinity. However, its core limitation lies in its difficulty in synergizing the treatment of both shallow soil seepage and deep groundwater. Existing technologies rely on single vertical pipes to passively collect water through perforations in the pipe wall. This makes it difficult to specifically extract deep, highly saline groundwater, while also hindering the efficient collection of shallow soil leaching water.

[0004] Traditional vertical pipes lack an extended water collection structure and can only rely on their own pipe diameter to form a limited water collection range. Shallow soil leaching water is difficult to quickly flow into the pipe, and the extraction of deep groundwater lacks a dedicated channel, which causes salt to easily migrate upward to the surface due to capillary action, forming a vicious cycle of "rebound after extraction". This problem has caused the salt removal rate of a single vertical pipe to remain at 30%-40% for a long time, which cannot meet the actual needs of efficient saline-alkali land management. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a drainage device for saline-alkali land management to solve the technical problems in the above-mentioned background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a drainage device for saline-alkali land treatment, comprising:

[0007] The water collection component has a hollow tubular structure and a water collection hole on its outer wall for collecting soil saline water.

[0008] The water collection component also includes a water collection cavity and a storage groove. The water collection main pipe is provided with a water collection cavity for collecting the flow of saline water in the soil, and the four corners of the outer side of the water collection main pipe are provided with storage grooves that match the expansion component, and the storage grooves are used to store the expansion component when it is closed.

[0009] The water extraction pipe is arranged at the inner axis position of the water collecting main pipe and cooperates with the water absorption component connected with the bottom thread to extract deep high-salinity groundwater and simultaneously extract the soil saline water flowing in from the water collecting main pipe;

[0010] The water absorption component includes a water absorption cylinder and a water absorption hole. The water absorption cylinder and the water pump are threadedly connected, and multiple groups of water absorption holes are opened on the surface of the water absorption cylinder for extracting groundwater and soil saline water. A filter layer is fixed on the inner wall of the water absorption cylinder.

[0011] The expansion assembly is movably connected to the outer wall of the water collection main pipe via a rotating shaft and includes multiple groups of expandable expansion branches. The top ends of the expansion branches are fixedly connected to a flip plate that extends into the interior of the water collection main pipe. The flip plate has a drainage channel connected to the interior of the expansion branch pipe. When the flip plate of the expansion branch pipe is subjected to the downward force of the pumping pipe, the expansion branch pipe opens relative to the water collection main pipe and connects to the water collection main pipe through the drainage channel, thereby collecting the flow of saline water in the soil.

[0012] The expansion assembly also includes infiltration holes and filter tubes. The infiltration holes are evenly arranged on the upper half of the expansion branch pipe for collecting soil salinity, and the filter tube is fixed to the inner wall of the expansion branch pipe for blocking soil and mud. The bottom of the expansion branch pipe is threadedly connected through a disassembly head for disassembling and assembling the filter tube.

[0013] The adsorption component is installed at the bottom of the water collecting main. The adsorption cavity inside it is filled with adsorption material and is used to perform preliminary desalination treatment on the incoming saline water.

[0014] The adsorption assembly includes a snap-fit ​​cylinder, a connecting cover, and a connecting rod. The connecting cover and the snap-fit ​​cylinder are connected by threads, and the surfaces of the snap-fit ​​cylinder and the connecting cover are composed of multiple groups of connecting rods evenly arranged to hold the filter material.

[0015] A central tube is fixed at the center of the clamping cylinder through multiple sets of connecting rods to guide the water pumping pipe when it descends;

[0016] The top of the water collection component is also connected to a suction component, and the bottom of the suction cylinder of the suction component is threadedly connected to the water collection main pipe, wherein the bottom of the suction cylinder plays a role in closing the top of the water collection main pipe, and a suction pipe with multiple groups of suction holes on the surface is fixed to the center of the inner side of the suction cylinder, and the bottom of the suction pipe is threadedly connected to the water pumping pipe, and a flange connection pipe is provided on one side of the suction cylinder to connect to the external suction equipment through a pipeline;

[0017] A desalination cylinder is connected between the suction cylinder and the suction pipe, and the interior of the desalination cylinder is filled with desalination adsorption material. A top cover is threadedly connected to the top of the desalination cylinder, and a disassembly ring provided on the top of the desalination cylinder plays a role in detaching the top cover.

[0018] The multiple groups of water collecting main pipes are connected end to end, and the two groups of water collecting main pipes are connected in a bidirectional manner through a bidirectional connecting ring. The bidirectional connecting ring also serves to fasten the adsorption component, and the water collecting main pipe and the suction component are also threadedly connected through a bidirectional connecting ring. The outer side of the water collecting main pipe at the lower end is threadedly connected with a bidirectional connecting ring, and the bottom of the bidirectional connecting ring is threadedly connected with a bottom sealing ring. The bottom sealing ring serves to fasten the adsorption component at the lower end.

[0019] By adopting the above technical solution and the coordinated design of the water collection component, expansion component, pumping pipe, and adsorption component, the system achieves efficient treatment of deep and shallow saline water in saline-alkali land. The water collection holes of the main water collection pipe work in conjunction with the infiltration holes of the deployable expansion branch pipe to form a three-dimensional water collection network, expanding the water collection range and simultaneously collecting shallow soil leaching water and deep groundwater. This overcomes the limited water collection range of traditional vertical pipes. The pumping pipe, located within the main water collection pipe, simultaneously extracts deep, high-salinity groundwater and collected shallow saline water, cutting off the upward migration path of salt along the capillary tubes and preventing "rebound after extraction." The dual desalination structure of the adsorption component and desalination cartridge allows for layered adsorption and filtration of the extracted water, reducing its salinity. After simple treatment, it can be reused for irrigation, achieving water resource recycling. The modular connection design allows the device to flexibly adapt to different drilling depths and layout requirements. Components such as the filter pipe and desalination cartridge are removable and replaceable for easy maintenance. The overall device significantly improves soil salt removal efficiency and is suitable for ecological restoration and agricultural improvement in saline-alkali land.

[0020] Furthermore, the water collection assembly further includes positioning rings, and two groups of positioning rings are fixed on the outside of each group of water collection main pipes.

[0021] By adopting the above technical solution, a filter layer covering multiple groups of water collection holes is wrapped around the outside of the positioning ring, thereby playing a role in blocking soil and mud.

[0022] Furthermore, the expansion assembly also includes a soil-breaking strip fixed to the upper half of the expansion branch pipe.

[0023] By adopting the above technical solution, the soil-breaking strip is used to separate the soil after the expansion branch pipe is flipped open, making it easier to flip the expansion component and avoiding the phenomenon of getting stuck.

[0024] In summary, the present invention mainly has the following beneficial effects: the present invention realizes the efficient treatment of saline water in deep and shallow layers of saline-alkali land through the coordinated design of water collection components, expansion components, pumping pipes and adsorption components. The water collection holes of the water collection main pipe cooperate with the infiltration holes of the expandable extension branch pipe to form a three-dimensional water collection network, which expands the water collection range and can collect shallow soil leaching water and deep groundwater at the same time, solving the problem of limited water collection range of traditional vertical pipes. The pumping pipe is located inside the water collection main pipe, which can simultaneously extract deep high-salt groundwater and collected shallow saline water, cutting off the path of salt migrating upward with the capillary, avoiding "rebound after pumping and drainage". The dual desalination structure of the adsorption component and the desalination cylinder performs layered adsorption and filtration on the extracted water to reduce the salt content. After simple treatment, it can be reused for irrigation, realizing the recycling of water resources. The modular connection design enables the device to flexibly adapt to different drilling depths and layout requirements, and the filter tube, desalination cylinder and other components are removable and replaceable for easy maintenance. The overall device greatly improves the soil salt removal rate and is suitable for ecological restoration and agricultural improvement of saline-alkali land. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of multiple water collection components in the connection and use state of the present invention;

[0026] Figure 2 This is a schematic structural diagram of a single water collection assembly of the present invention in an unused state;

[0027] Figure 3 This is an enlarged structural diagram of the water collection assembly of the present invention;

[0028] Figure 4 This is a cross-sectional view of the structure of the present invention in a connected and used state;

[0029] Figure 5 For the present invention Figure 4 A magnified view of point A;

[0030] Figure 6 This is an enlarged structural diagram of the water absorbing component of the present invention;

[0031] Figure 7 For the present invention Figure 4 Enlarged view of point B;

[0032] Figure 8 This is an enlarged exploded view of the structure of the expansion component of the present invention;

[0033] Figure 9 For the present invention Figure 4 Enlarged view of point C;

[0034] Figure 10 This is an enlarged exploded view of the structure of the adsorption component of the present invention;

[0035] Figure 11 For the present invention Figure 4 Enlarged view of point D;

[0036] Figure 12 This is an enlarged exploded view of the structure of the suction assembly of the present invention;

[0037] Figure 13 This is an enlarged view of the structure of the bidirectional connecting ring of the present invention.

[0038] In the figure: 1. Water collection component; 101. Water collection main pipe; 102. Water collection chamber; 103. Storage tank; 104. Water collection hole; 105. Positioning ring; 2. Extension component; 201. Extension branch pipe; 202. Flip plate; 203. Drainage channel; 204. Rotating shaft; 205. Infiltration hole; 206. Soil-breaking strip; 207. Filter tube; 208. Disassembly head; 3. Water suction pipe; 4. Water absorption component; 401. Water absorption cylinder; 402. Water absorption hole; 5. Adsorption component; 501. Clamping cylinder; 502. Connecting cover; 503. Center tube; 504. Connecting rod; 6. Suction component; 601. Suction cylinder; 602. Suction pipe; 603. Suction hole; 604. Flange connecting pipe; 605. Desalination cylinder; 606. Top cover; 607. Disassembly ring; 7. Two-way connecting ring; 8. Bottom sealing ring. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0040] The following describes an embodiment of the present invention based on its overall structure.

[0041] Example

[0042] like Figure 1-13 As shown, the drainage device provided in this embodiment mainly consists of a water collection component 1, an expansion component 2, a pumping pipe 3, a water absorption component 4, an adsorption component 5, a suction component 6 and a connection structure. It can achieve efficient removal of saline water in deep and shallow layers of saline-alkali land through stratified water collection and linked pumping.

[0043] The water collection component 1 includes:

[0044] Water collecting main pipe 101: Hollow tubular structure, with water collecting holes 104 on the outer wall and a water collecting cavity 102 inside for collecting soil saline water. Storage grooves 103 are provided at the four corners of the outer side for accommodating the expansion module 2 in the closed state.

[0045] Positioning rings 105: Two groups are fixed on the outside of the water collection main 101 and wrapped with a filter layer, such as geotextile, to prevent soil particles from entering the water collection hole 104;

[0046] Extension 2 includes:

[0047] Extension branch 201: movably connected to the water collecting main pipe 101 via a rotating shaft 204, it can be extended to form a 100-degree angle with the water collecting main pipe 101. The upper part is provided with a permeation hole 205, and the outer wall is fixed with a soil-breaking strip 206;

[0048] The flip plate 202 is fixed to the top of the extension branch pipe 201 and has a drainage channel 203 inside. After the extension branch pipe 201 is flipped, the inside is connected to the water collecting main pipe 101. When squeezed by the pumping pipe 3, the extension branch pipe 201 is pushed open.

[0049] Filter tube 207: fixed to the inner wall of the extension branch 201, with the bottom threadedly connected via a disassembly head 208 for easy cleaning or replacement;

[0050] The water pumping pipe 3 passes through the axis of the water collecting main pipe 101, and is connected by multiple sets of threads at the head and tail. The bottom thread is connected to the water absorption component 4, wherein the surface of the water absorption cylinder 401 of the water absorption component 4 is provided with a water absorption hole 402, and the inner wall is fixed with a filter layer for extracting deep groundwater and saline water in the water collecting chamber 102;

[0051] The adsorption component 5 includes:

[0052] The clamping cylinder 501 is connected to the connecting cover 502 by threads. The surface is composed of multiple groups of connecting rods 504 to form a grid structure. The interior is filled with salt adsorption material. The central tube 503 is fixed to the center of the clamping cylinder 501 to provide a guide for the descent of the water pumping pipe 3.

[0053] The suction assembly 6 comprises:

[0054] Suction cylinder 601: The bottom is threadedly connected to the water collecting main pipe 101, and one side is provided with a flange connecting pipe 604 for connecting to external suction equipment;

[0055] Suction pipe 602: fixed to the center of the inner side of the suction cylinder 601, with a suction hole 603 on the surface and a threaded connection with the water pump 3 at the bottom;

[0056] Desalination cartridge 605: It is clamped between the suction cartridge 601 and the suction pipe 602, and is filled with desalination adsorption material. The top is sealed by a top cover 606 and can be removed and replaced by a disassembly ring 607;

[0057] Connection structure: The bidirectional connection ring 7 is used for connecting the ends of multiple water collecting main pipes 101 . The bottom blocking ring 8 is threadedly connected to the lowermost water collecting main pipe 101 to fasten the bottom adsorption assembly 5 .

[0058] The working principle of the present invention is as follows: when using this drainage device to manage and drain saline-alkali land, the staff first conducts on-site drilling and sampling to analyze indicators such as soil type (sandy soil, clay soil, etc.), salt content distribution, and permeability coefficient to determine the depth of the groundwater level, water salinity, and seasonal fluctuations. Then, through electrical depth sounding or ground-penetrating radar, underground obstacles (such as rock layers and abandoned pipelines) are detected to avoid construction obstructions.

[0059] At the same time, regional meteorological data is collected to understand information such as annual precipitation and evaporation, which assists in designing the vertical pipe drainage capacity and layout density;

[0060] According to the survey data and the existing vertical pipe specifications, the spacing between pipes on saline-alkali land is designed, such as 3-8 meters, and the pipes are buried at a depth of 0.5-1 meter below the groundwater level. This determines the number of water collection components 1. Considering the infiltration differences and drainage requirements under different soil conditions, the specifications and layout of the water collection components 1 can be optimized and adjusted to ensure the efficiency and applicability of the drainage system.

[0061] Select salt-alkali corrosion-resistant materials, such as HDPE and UPVC pipes, or metal pipes with anti-corrosion coatings on the surface, prepare filtration materials (geotextiles, quartz sand), adsorption materials (activated carbon, bentonite), and pumping equipment (submersible pumps, controllers). After completing the scheme design and material selection, you can enter the on-site construction phase. Before officially starting the burial operation of the water collection component 1, you must also complete preparatory work such as site cleaning and measurement and layout to lay the foundation for the smooth progress of subsequent construction;

[0062] Remove weeds, rocks and other obstacles from the construction area, level the land, use a total station or GPS positioning equipment to mark the vertical pipe burial points according to the design drawings, ensure that the installation position spacing error of the water collection component 1 does not exceed ±10cm, dig temporary drainage ditches to prevent water accumulation during construction and affect operations, and set up warning signs to ensure construction safety;

[0063] Use equipment such as spiral drills and hydraulic drills to drill vertically at the marked points. The hole diameter should be 5-10 cm larger than the outer diameter of the water collection main pipe 101 of the water collection component 1 to facilitate pipe installation and filter layer filling. Record the changes in the soil layer during the drilling process and adjust the construction plan in time if abnormal geology occurs. After the drilling depth reaches the design requirement, clean the soil residue in the hole to ensure that the hole wall is vertical and smooth.

[0064] Different numbers of water collection components 1 and water pumping pipes 3 are selected according to the actual drilling depth, wherein the number of water collection components 1 and water pumping pipes 3 is the same;

[0065] During assembly, first, the water collection main pipes 101 of each two water collection assemblies 1 are threadedly and rotatably connected via the bidirectional connecting ring 7. At the same time, the bottom of each water collection main pipe 101 is assembled and connected to its corresponding adsorption assembly 5 via the bidirectional connecting ring 7, so that each water collection main pipe 101 has a set of adsorption assemblies 5 at the bottom. With the cooperation of the snap-fitting cylinder 501 and the connecting cover 502 of the adsorption assembly 5, the adsorption material for salt separation can be filled inside the adsorption assembly 5, thereby performing preliminary desalination treatment on the salt in the soil moisture. The desalinated water then flows along the water collection main pipe 101 to the vicinity of the water absorption assembly 4.

[0066] After the number of water collection pipes 101 corresponding to the depth of the drill hole is installed, the staff connects the multiple sets of water extraction pipes 3 by threading them end to end, and also threading the water absorption assembly 4 under the bottom set of water extraction pipes 3. At this time, the staff inserts the connected water extraction pipes 3 into the multiple sets of water collection pipes 101 through the equipment and lowers them;

[0067] During the descent of the water pumping pipe 3, the water absorption component 4 squeezes the extension component 2 movably connected to the outside of each water collecting main pipe 101, that is, squeezes the flip plate 202, so that the extension branch pipe 201 of the extension component 2 flips along the rotation axis 204 at a certain angle, so that the multiple extension components 2 are unfolded relative to the water collecting component 1 and extend into the soil synchronously, thereby increasing the water collection range in the soil;

[0068] During the specific operation, when the water pumping pipe 3 is lowered to open the expansion assembly 2, the staff can pour a certain amount of water into the gap between the water collecting assembly 1 and the inner wall of the borehole, thereby loosening the soil on the inner wall of the borehole to a certain extent, making it easier for multiple groups of expansion assemblies 2 to be turned over and inserted into the soil;

[0069] At the same time, a soil breaking strip 206 is fixed on the outside of each set of extension branches 201, wherein the soil breaking strip 206 is a tapered strip structure, thereby better breaking the soil and making it easier for the extension branches 201 to be inserted into the soil;

[0070] As the pumping pipe 3 gradually descends inside the water collection main 101, the multiple groups of expansion components 2 movably connected to the outside of each group of water collection components 1 can be opened in sequence, wherein the four groups of expansion components 2 outside every two groups of water collection components 1 are staggered, thereby better increasing the water collection range inside the soil;

[0071] When the water absorption component 4 at the bottom end of the pumping pipe 3 is inserted to the bottom of the borehole, the water absorption component 4 is located below the groundwater level. Then, the saline water in the soil enters the water collection main 101 through the water collection holes 104 and the infiltration holes 205, and naturally flows to the vicinity of the water absorption component 4, facilitating the subsequent suction operation of the water absorption component 4.

[0072] When all the expansion components 2 are opened, the staff can fill the gap between the water collection main 101 and the inner wall of the borehole with a filter layer. Gravel with a particle size of 5-10 mm and quartz sand wrapped with geotextile with a particle size of 1-3 mm are laid from bottom to top to effectively prevent soil particles from entering the water collection main 101 through the water collection hole 104. After the filter layer is filled, the original soil is backfilled in layers, with each layer no thicker than 30 cm and compacted to the designed density. The top of the backfill soil is slightly higher than the ground by 5-10 cm to form a drainage slope.

[0073] Finally, the topmost water collecting main pipe 101 is threadedly connected to the suction assembly 6 via a two-way connecting ring 7, wherein the bottom of the suction pipe 602 arranged in the center of the suction assembly 6 is synchronously threadedly connected to the top of the water pumping pipe 3, wherein the surface of the suction pipe 602 is provided with multiple groups of suction holes 603, and then connected to the flange connection pipe 604 at the water suction end of the external pumping equipment through a pipe, and then the groundwater is extracted using the suction assembly 4 through the suction cylinder 601, the suction pipe 602 and the multiple groups of water pumping pipes 3;

[0074] Among them, salt in saline-alkali land often rises to the surface with groundwater through soil capillary action, and after evaporation, the residual accumulation exacerbates salinization. Extracting groundwater can effectively lower the groundwater level to below the critical depth, cutting off the channel for salt to rise with water, reducing surface salt enrichment from the root, and alleviating the risk of secondary soil salinization.

[0075] When groundwater is extracted, a local water level difference is formed, which prompts the salt water in the surrounding soil to flow toward the water collection component 1. Combined with irrigation and leaching, it can accelerate the speed at which soluble salts in the soil are discharged along with water. Especially after irrigation, water extraction can promptly remove the salt leached from the soil surface from the cultivated layer, shortening the soil desalination cycle and improving the treatment efficiency.

[0076] Continuous extraction of high-salinity groundwater can gradually reduce the salt concentration of the soil solution, reduce the damage of sodium ions to soil colloids, improve soil aggregate structure, and enhance soil permeability and water and fertilizer retention capacity. At the same time, reasonable regulation of groundwater levels can prevent the soil from being in a saturated state for a long time, creating a suitable moisture and ventilation environment for crop root growth.

[0077] For the drainage structure in which the pumping pipe 3 is located inside the water collection main pipe 101, groundwater extraction can be linked with soil seepage water collection. The pumping pipe 3 directly extracts deep high-salinity groundwater and simultaneously extracts the flowing soil saline water. The water collection main pipe 101 and the extended branch pipe 201 collect shallow soil leached water. The combination of the two expands the drainage range, reducing the upward migration of deep salt and accelerating the discharge of shallow salt, solving the problem that a single vertical pipe is difficult to take into account both deep and shallow drainage.

[0078] By extracting groundwater to reduce soil salinity and water levels, soil pH, osmotic pressure and other indicators are closer to crop growth requirements, significantly improving the survival rate of salt-tolerant plants, creating favorable conditions for ecological restoration and agricultural utilization of saline-alkali land, and promoting the transformation of the managed areas from "improvement" to "utilization";

[0079] Furthermore, a desalination cylinder 605 is provided between the interior of the suction cylinder 601 and the suction pipe 602, and the groundwater and soil salinity extracted through the suction pipe 3 are subjected to adsorption and filtration again. In other words, the entire extracted water undergoes two adsorption and filtration desalination operations, which greatly reduces the salt content of the extracted water. After a simple treatment by an external desalination device, the saline-alkali land can be quickly reused for irrigation.

[0080] The flange connection pipes 604 of the multiple sets of drainage devices can be connected to the main pipeline of the pumping system, thereby enabling multiple synchronous pumping operations.

[0081] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A drainage device for saline-alkali land treatment, characterized in that: include: A water collection assembly (1), wherein the water collection main pipe (101) of the water collection assembly (1) adopts a hollow tubular structure and has a water collection hole (104) formed on its outer wall for collecting soil saline water; A water extraction pipe (3) is arranged at the inner axis position of the water collecting main pipe (101) and cooperates with a water absorbing component (4) connected by a bottom thread to extract deep high-salinity groundwater and simultaneously extract saline soil moisture collected and flowing in from the water collecting main pipe (101); The expansion assembly (2) is movably connected to the outer wall of the water collecting main pipe (101) via a rotating shaft (204), and comprises a plurality of expandable expansion branches (201). The top ends of the expansion branches (201) are fixedly connected to a turnover plate (202) extending into the interior of the water collecting main pipe (101), and a drainage channel (203) communicating with the interior of the expansion branch pipe (201) is provided inside the turnover plate (202). When the turnover plate (202) of the expansion branch pipe (201) is subjected to a downward force from the pumping pipe (3), the expansion branch pipe (201) is opened relative to the water collecting main pipe (101), and is communicated with the water collecting main pipe (101) via the drainage channel (203), thereby being used for the flow and collection of saline water in the soil. The adsorption assembly (5) is installed at the bottom of the water collecting main pipe (101), and the adsorption cavity inside the adsorption assembly (5) is filled with adsorption material for performing preliminary desalination treatment on the inflowing salt water.

2. The drainage device for saline-alkali land treatment according to claim 1, characterized in that: The water collection assembly (1) further comprises a water collection chamber (102) and a receiving groove (103). The water collection main pipe (101) is provided with a water collection chamber (102) for collecting saline water in the soil. The four corners of the outer side of the water collection main pipe (101) are provided with receiving grooves (103) that match the expansion assembly (2). The receiving grooves (103) are used to store the expansion assembly (2) when it is closed.

3. The drainage device for saline-alkali land treatment according to claim 1, characterized in that: The water collection assembly (1) further comprises positioning rings (105), two groups of positioning rings (105) are fixed on the outside of each group of water collection main pipes (101), and a filter layer covering the multiple groups of water collection holes (104) is wrapped around the outside of the positioning rings (105), thereby playing a role in blocking soil and mud.

4. The drainage device for saline-alkali land treatment according to claim 1, characterized in that: The expansion assembly (2) further comprises a permeation hole (205) and a filter tube (207). The permeation holes (205) are evenly arranged in the upper half of the expansion branch pipe (201) for collecting soil saline water, and the filter tube (207) is fixed to the inner wall of the expansion branch pipe (201) for blocking soil mud. The bottom of the expansion branch pipe (201) is threadedly connected via a disassembly head (208) for disassembling and assembling the filter tube (207).

5. The drainage device for saline-alkali land treatment according to claim 1, characterized in that: The expansion assembly (2) further comprises a soil-breaking strip (206) fixed to the upper half of the expansion branch pipe (201), and the soil-breaking strip (206) is used to separate the soil after the expansion branch pipe (201) is turned over and opened.

6. The drainage device for saline-alkali land treatment according to claim 1, characterized in that: The water absorption assembly (4) comprises a water absorption cylinder (401) and a water absorption hole (402). The water absorption cylinder (401) and the water extraction pipe (3) are threadedly connected, and a plurality of groups of water absorption holes (402) are provided on the surface of the water absorption cylinder (401) for extracting groundwater and saline water in the soil. A filter layer is fixed on the inner wall of the water absorption cylinder (401).

7. The drainage device for saline-alkali land treatment according to claim 1, characterized in that: The adsorption assembly (5) comprises a snap-fit ​​cylinder (501), a connecting cover (502), and a connecting rod (504); the connecting cover (502) and the snap-fit ​​cylinder (501) are connected via a threaded connection, and the surfaces of the snap-fit ​​cylinder (501) and the connecting cover (502) are both formed by a plurality of evenly arranged connecting rods (504), which serve to hold the filter material; A central tube (503) is fixed at the center of the locking cylinder (501) via multiple groups of connecting rods (504), and is used to guide the water pumping pipe (3) when it descends.

8. The drainage device for saline-alkali land treatment according to claim 1, characterized in that: The top of the water collection component (1) is also connected to a suction component (6), and the bottom of the suction cylinder (601) of the suction component (6) is threadedly connected to the water collection main pipe (101), wherein the bottom of the suction cylinder (601) plays a role in closing the top of the water collection main pipe (101), and a suction pipe (602) with multiple groups of suction holes (603) on the surface is fixed to the center of the inner side of the suction cylinder (601), and the bottom of the suction pipe (602) is threadedly connected to the water pumping pipe (3), and a flange connection pipe (604) connected to an external suction device through a pipeline is provided on one side of the suction cylinder (601); A desalination cylinder (605) is snap-fitted and connected between the suction cylinder (601) and the suction pipe (602), and the interior of the desalination cylinder (605) is filled with desalination adsorption material. A top cover (606) is threadedly connected to the top of the desalination cylinder (605), and a disassembly ring (607) provided on the top of the desalination cylinder (605) serves to detach the top cover (606).

9. The drainage device for saline-alkali land treatment according to claim 8, characterized in that: The plurality of water collecting main pipes (101) are connected end to end, and the two groups of water collecting main pipes (101) are connected by two-way thread through a two-way connecting ring (7). The two-way connecting ring (7) also serves to fasten the adsorption assembly (5), and the water collecting main pipe (101) and the suction assembly (6) are also connected by thread through the two-way connecting ring (7).

10. The drainage device for saline-alkali land treatment according to claim 9, characterized in that: The outer side of the water collecting main pipe (101) at the lowest end is threadedly connected to a bidirectional connecting ring (7), and the bottom of the bidirectional connecting ring (7) is threadedly connected to a bottom sealing ring (8), and the bottom sealing ring (8) plays a role in fastening the adsorption component (5) at the lowest end.

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