A subsurface flow wetland anti-leakage reinforcement system based on sandwich sealing kit

Abstract

The application discloses a subsurface flow wetland anti-leakage reinforcing system based on a sandwich sealing kit, which comprises a wetland pool body, a layered anti-seepage structure, a water distribution system, a water collection system, a sandwich sealing kit and a leakage monitoring system; the wetland pool body is used for supporting various components and realizing treatment of sewage; the layered anti-seepage structure is laid on the pool bottom and the pool wall of the wetland pool body, and the layered anti-seepage structure divides the wetland pool body into three parts, which are a water distribution channel, a filter tank and a water collection channel from left to right; the water inlet end of the water distribution system is arranged in the water distribution channel, and the water outlet end of the water distribution system is arranged in the filter tank; the water outlet end of the water collection system is arranged in the water collection channel, and the water inlet end of the water collection system is arranged in the filter tank; the sandwich sealing kit is embedded in the joint, corner and connection of the water distribution system and the water collection system of the layered anti-seepage structure; and the leakage monitoring system is buried in the layered anti-seepage structure.

Description

Technical Field

[0001] This invention relates to the field of subsurface flow wetland ecological management technology, specifically a subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit. Background Technology

[0002] Subsurface flow wetlands, as a highly efficient and low-cost ecological wastewater treatment and restoration technology, are widely used in fields such as domestic sewage purification, advanced industrial wastewater treatment, watershed ecological restoration, and groundwater recharge and conservation. Their core principle is the synergistic effect of wetland substrates, aquatic plants, and microorganisms to intercept, adsorb, degrade, and transform pollutants. However, the long-term stable operation of subsurface flow wetlands highly depends on a reliable anti-seepage system. If the anti-seepage effect is poor, not only will the treated purified water be lost, reducing wastewater treatment efficiency, but incompletely degraded pollutants may also seep into underground aquifers, causing groundwater pollution and triggering serious ecological and environmental problems.

[0003] Chinese patent application CN121091365B discloses a method and system for detecting leakage in the impermeable layer during the construction of artificial wetlands. This patented technical solution analyzes the changes in potential difference and humidity data of the electrode grid beneath the impermeable layer to determine the potential infiltration time period for each electrode grid. Based on the infiltration time period, it analyzes the overlap of liquid diffusion between different electrode grids, dividing the electrode grid into several diffusion regions. These diffusion regions are further divided into suspected damage regions and diffusion interaction regions, and the area relationship between the suspected damage regions and diffusion interaction regions is analyzed to obtain the infiltration failure probability of the diffusion region corresponding to each electrode grid. Based on the infiltration failure probability, leakage points are marked.

[0004] The aforementioned patent provides a method and system for detecting leakage in the impermeable layer during the construction of artificial wetlands. This method can accurately locate areas where impermeable layer damage may have spread, improving the accuracy of identifying the specific location of leakage. However, existing systems primarily detect the location of leaks. In practice, existing subsurface flow wetlands have poor impermeability, and leaks easily occur at the joints of the impermeable layer and at the junctions between the impermeable layer and other components. This leads to the leakage of large amounts of wastewater, causing groundwater pollution. Summary of the Invention

[0005] The purpose of this invention is to provide a subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit, which aims to improve the poor seepage prevention performance of existing subsurface flow wetlands. Seepage problems easily occur at the joints of the seepage prevention layer and at the joints between the seepage prevention outlet layer and other components, which leads to sewage leakage and groundwater pollution.

[0006] This invention is implemented as follows: A subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit includes: The wetland pool body is used to support various components and realize the treatment of sewage; A layered seepage-proof structure is laid on the bottom and walls of the wetland pond, dividing the wetland pond into three parts from left to right: a water distribution channel, a filtration pond, and a water collection channel. A water distribution system, wherein the inlet of the water distribution system is located in a water distribution channel, and the outlet of the water distribution system is located inside a filter tank; A water collection system, wherein the outlet of the water collection system is located in a water collection channel, and the inlet of the water collection system is located inside a filter tank. The sandwich sealing kit is embedded in the joints, corners, and connections with the water distribution and collection systems of the layered waterproof structure. A leakage monitoring system is embedded inside the layered seepage prevention structure to provide timely early warning when leakage occurs.

[0007] Preferably, the layered seepage-proof structure comprises, from bottom to top, a base leveling layer, a rigid seepage-proof layer, an elastic buffer layer, and a protective layer. The base leveling layer is laid with cement mortar and is used to level and reinforce the bottom and walls of the wetland pond, preventing sharp debris from puncturing the subsequent seepage-proof structure. The rigid seepage-proof layer is cast with corrosion-resistant concrete, incorporating a penetrating crystalline waterproofing agent to form the first seepage barrier against groundwater backflow and sewage infiltration. The elastic buffer layer is laid with modified rubber pads, which have good elasticity and tensile strength, and are used to buffer the forces of wetland matrix settlement and water impact on the seepage-proof structure, preventing the rigid seepage-proof layer from cracking. The protective layer is laid with needle-punched geotextile to protect the elastic buffer layer and the rigid seepage-proof layer from being punctured by sharp particles in the wetland matrix.

[0008] Preferably, the sandwich sealing kit has protruding connecting parts at both ends, and the surface of the connecting parts has sealing grooves filled with sealant to achieve a tight connection between adjacent sealing kits and prevent leakage channels from forming at the connection. The sandwich sealing kit includes a middle support layer, a left sealing layer, and a right sealing layer, forming a sandwich composite structure of "left sealing layer-middle support layer-right sealing layer". The middle support layer is made of high-strength carbon fiber composite material, and its surface has uniformly distributed elastic protrusions to enhance the structural strength and compressive strength of the sealing kit, while providing elastic support for the two sealing layers to ensure that the sealing layers are tightly fitted to the layered seepage prevention structure. The left and right sealing layers are both made of water-swellable rubber and coated with an antimicrobial erosion coating to fill the sealing gaps, achieve self-adaptive sealing, and the antimicrobial erosion coating can effectively resist the erosion of microorganisms in wetlands and extend the service life of the sealing kit.

[0009] Preferably, the installation method of the sandwich sealing kit is designed to adapt to different parts: at the splicing of the layered seepage prevention structure, the sandwich sealing kit is embedded in the splicing gap, the left sealing layer is attached to one side of the seepage prevention structure, the right sealing layer is attached to the other side of the seepage prevention structure, and the joint is sealed with sealant. The elastic protrusion of the middle support layer is in close contact with the splicing gap to form a double seal; at the corner of the layered seepage prevention structure, an arc-shaped sandwich sealing kit is used, with the arc radius consistent with the corner radius of the water distribution channel, filter tank, and collection channel of the layered seepage prevention structure, to ensure that the sealing kit is completely attached to the layered seepage prevention structure at the corner, and to avoid seal failure due to stress concentration at the corner; at the connection between the water distribution system, the water collection system and the layered seepage prevention structure, the sandwich sealing kit is fitted onto the outer wall of the water distribution pipe and the water collection pipe, the left sealing layer is attached to the outer wall of the pipe, the right sealing layer is attached to the layered seepage prevention structure, and the joint is sealed with sealant to achieve seamless connection between the pipe and the layered seepage prevention structure, preventing sewage from leaking along the outer wall of the pipe.

[0010] Preferably, the leakage monitoring system includes several leakage sensors, a data acquisition unit, and a monitoring terminal. The leakage sensors are evenly embedded between the elastic buffer layer and the protective layer to monitor leakage in real time and collect data such as leakage volume and location. The leakage sensors are designed to be corrosion-resistant and waterproof, suitable for humid and corrosive wetland environments. The data acquisition unit is electrically connected to the leakage sensors to receive the data collected by the leakage sensors and transmit the data to the monitoring terminal. The monitoring terminal displays the leakage monitoring data in real time. When the leakage volume exceeds a preset threshold, it automatically issues an alarm signal and locates the leakage point, providing precise guidance for repair work.

[0011] Preferably, the monitoring terminal has an industrial display screen on its front, a control unit below the industrial display screen, and heat dissipation holes on one side. The monitoring terminal has support feet at its bottom, with a base plate at the bottom of each support foot and multiple bolt holes on the base plate. The monitoring terminal has multiple connectors on its back, a connecting cable on its side, and a connector plug at the end of the connecting cable. A power cord is also provided on the side of the monitoring terminal, with a power plug at the end of the power cord. The monitoring terminal integrates a control module, which is connected to a display module, a leakage monitoring module, an alarm module, and a power supply module. The control module controls the entire monitoring terminal. The display module works with the industrial display screen to detect monitored data. The leakage monitoring module monitors leakage in the wetland pool. The alarm module issues an alarm when the leakage monitoring module detects leakage. The power supply module supplies power to the entire leakage monitoring system.

[0012] Preferably, the data acquisition device has a connecting line at its front end, a connecting plug at its end, and the connecting plug is connected to a connecting connector; and the data acquisition device has multiple male connectors at its rear end, a wire is connected to the top of the leakage sensor, and a female connector is provided at the end of the wire, which is electrically connected to the male connector.

[0013] Preferably, the water distribution system includes a main water distribution pipe, an inlet butterfly valve, and branch water distribution pipes; the main water distribution pipe is provided with an inlet butterfly valve at its open end, and multiple branch water distribution pipes are provided on both sides of the main water distribution pipe from front to back, with multiple water distribution nozzles at the bottom of each branch water distribution pipe; a first rotating handle is provided at the top of the inlet butterfly valve, and the top of the first rotating handle is higher than the water distribution channel.

[0014] Preferably, the water collection system includes a main water collection pipe, an outlet butterfly valve, and water collection branch pipes. The outlet butterfly valve is provided at the outlet end of the main water collection pipe, and a second rotating handle is provided at the top of the outlet butterfly valve. The second rotating handle is higher than the water collection channel. Multiple water collection branch pipes are evenly arranged on both sides of the main water collection pipe from front to back. Multiple funnels are evenly arranged at the top of the water collection branch pipes. Filter cloth is tied to the top opening of the funnel by a binding ring.

[0015] Preferably, the system further includes a repair system, which includes a support base, a repair agent storage tank, a mixing assembly, a high-pressure grouting pump, and a grouting assembly. The repair agent storage tank and the high-pressure grouting pump are mounted on the support base, and the suction end of the high-pressure grouting pump is connected to the repair agent storage tank. The repair agent storage tank is equipped with a mixing assembly for mixing the repair agent. The discharge end of the high-pressure grouting pump is connected to the grouting assembly.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention features a sandwich sealing kit, employing a composite structure consisting of a left sealing layer, a middle support layer, and a right sealing layer. This overcomes the limitations of traditional single-structure sealing components. The middle support layer provides high-strength support, while the water-swellable sealing layers on both sides achieve adaptive sealing, automatically filling the sealing gap upon contact with water. This solves the technical problem of traditional sealing structures not fitting tightly and easily creating leakage channels, significantly improving sealing performance. At the same time, the antimicrobial erosion coating and high-strength carbon fiber middle layer on the surface of the sandwich sealing kit effectively enhance the sealing kit's anti-aging, anti-puncture, and anti-corrosion capabilities, greatly reducing maintenance costs.

[0017] 2. This invention employs a layered seepage-proof structure in synergy with a sandwich sealing kit. The layered seepage-proof structure progresses from the base leveling layer to the protective layer, combining a rigid seepage-proof layer with an elastic buffer layer. This ensures seepage prevention while adapting to wetland substrate settlement and water impact, preventing cracking of the seepage-proof structure. The sandwich sealing kit is precisely embedded at the joints, corners, and pipe connections of the seepage-proof structure, achieving a complete seal without dead angles and thoroughly solving the problem of easy leakage at joints and corners in existing seepage-proof systems.

[0018] 3. This invention integrates a leakage monitoring system and a rapid repair system. The leakage sensor can monitor the leakage situation in real time, accurately locate the leakage point, and the monitoring terminal will automatically alarm. The repair system can quickly repair the leakage point without damaging the wetland matrix and plants or stopping the operation of the wetland through high-pressure grouting. It solves the technical problems of existing anti-leakage systems, such as difficulty in locating leakage points, inconvenience in repair, and impact on wetland operation, and greatly improves the system's operation and maintenance efficiency and reduces operation and maintenance costs.

[0019] 4. The sandwich sealing kit of the present invention can be designed with corresponding structural forms according to different installation parts (joints, corners, pipe connections), and can be seamlessly connected with the layered anti-seepage structure, water distribution system, and water collection system. It does not affect the hydraulic conduction inside the wetland and can avoid matrix blockage, thus ensuring the sewage treatment efficiency of the subsurface flow wetland. At the same time, the system is easy to construct, and the installation of the layered anti-seepage structure and the sandwich sealing kit can be carried out simultaneously, shortening the construction cycle by more than 30%. It is suitable for the construction of subsurface flow wetlands of various scales and under various working conditions, and has strong practicality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the layered seepage prevention structure of the present invention; Figure 3 This is a schematic diagram of the sandwich sealing kit of the present invention; Figure 4 This is a schematic diagram of the leakage monitoring system of the present invention; Figure 5 This is a schematic diagram of the monitoring terminal of the present invention from a front-end oblique downward view. Figure 6 This is a schematic diagram of the monitoring terminal of the present invention from a rear-end oblique downward view. Figure 7 This is a structural block diagram of the internal structure of the monitoring terminal of the present invention; Figure 8 This is a schematic diagram of the structure of the data acquisition device and the leakage sensor of the present invention working together; Figure 9 This is a schematic diagram of the water distribution system of the present invention; Figure 10 This is a schematic diagram of the water collection system of the present invention; Figure 11 This is a schematic diagram of the repair system of the present invention; Figure 12 This is a schematic diagram of the structure of the support base of the present invention; Figure 13 This is a schematic diagram of the structure of the repair agent storage tank of the present invention; Figure 14 This is a schematic diagram of the structure of the stirring assembly of the present invention; Figure 15 This is a schematic diagram of the high-pressure grouting pump of the present invention; Figure 16 This is a schematic diagram of the grouting assembly of the present invention.

[0021] In the diagram: 1. Wetland pool; 01. Water distribution channel; 02. Filtration pool; 03. Water collection channel; 2. Layered seepage prevention structure; 21. Base leveling layer; 22. Rigid seepage prevention layer; 23. Elastic buffer layer; 24. Protective layer; 3. Sandwich sealing kit; 31. Middle support layer; 32. Left sealing layer; 33. Right sealing layer; 4. Leakage monitoring system; 41. Monitoring terminal; 411. Industrial display screen; 412. Heat dissipation holes; 413. Control unit; 414. Support legs; 415. Base plate; 416. Bolt holes; 417. 418. Connecting connector; 419. Connecting wire; 42. Data acquisition unit; 421. Connecting male connector; 422. Connecting wire; 423. Connecting plug; 43. Leakage sensor; 431. Wire; 432. Connecting female connector; 5. Water distribution system; 51. Main water distribution pipe; 52. Inlet butterfly valve; 521. First rotating handle; 53. Branch water distribution pipe; 531. Sprinkler head; 6. Water collection system; 61. Main water collection pipe; 62. Outlet butterfly valve; 621. Second rotating handle; 63. Branch water collection pipe; 631. Leakage sensor; 44. Connecting wire; 45. Data acquisition unit; 46. Connecting male connector; 422. Connecting wire; 423. Connecting female connector; 44. Leakage sensor; 45. Connecting female connector; 46. Leakage sensor; 47. Connecting female connector; 48. Connecting male connector; 49. Connecting female connector; 422. Connecting female connector; 423. Leakage sensor; 44. Connecting female connector; 45. Water distribution system; 56. Water distribution main pipe; 57. Inlet butterfly valve; 58. First rotating handle; 59. Branch water distribution pipe; 50. Water distribution branch pipe; 51. Leakage sensor; 42. Connecting female connector; 42. Connecting male connector; 423. Connecting female connector; 44. Connecting female connector; 45. Leakage sensor; 46. Connecting female connector; 47. Connecting male connector; 48. Connecting male connector; 49. Connecting female connector; 424. Connecting female connector; 425. Connecting male connector; 426. Connecting female connector; 427. Connecting male connector; 428. Connecting male connector; 429 632. Bucket; 633. Filter cloth; 7. Binding ring; 7. Repair system; 71. Support base; 711. Support rod; 712. Base frame; 713. Bottom hole; 72. Repair agent storage tank; 721. Suction pipe; 722. First flange; 723. Support rod; 724. Base plate; 725. Fixing hole; 726. Inlet; 727. Cover; 728. Bearing; 729. Mounting bracket; 7291. Mounting plate; 7292. Mounting hole; 73. Mixing assembly; 731. Mixing motor; 7311. Connecting plate; 73 12. Connecting hole; 7313. Drive shaft; 732. Stirring rod; 7321. Splicing plate; 7322. Splicing hole; 7323. Angle plate; 74. High-pressure grouting pump; 741. Discharge pipe; 742. Second flange; 743. Base; 744. Perforation; 745. Suction pipe; 746. Third flange; 75. Grouting assembly; 751. Injection needle; 7511. Handle; 7512. Threaded joint; 752. Guide pipe; 7521. Adapter cap; 7522. Mounting joint; 7523. Fourth flange. Detailed Implementation

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details: Example

[0024] like Figure 1 As shown in the figure, this embodiment discloses a subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit 3. The entire system is based on a wetland pool body 1 as the supporting structure. The interior of the wetland pool body 1 is divided into three functional areas: a water distribution channel 01, a filtration pool 02, and a water collection channel 03 by a layered seepage prevention structure 2. The bottom and walls of the pool are fully covered with the layered seepage prevention structure 2 to form a complete seepage prevention base. The water distribution system 5 is installed between the water distribution channel 01 and the filtration pool 02, with the inlet end located in the water distribution channel 01 and the outlet end extending into the filtration pool 02. The water collection system 6 is correspondingly installed between the water collection channel 03 and the filtration pool 02, with the outlet end located in the water collection channel 03 and the inlet end located in the filtration pool 02. The two hydraulic systems work together to achieve uniform sewage distribution and stable collection of purified water. The joints and corners of the layered seepage prevention structure 2, as well as the connection points between the water distribution system 5, the water collection system 6 and the seepage prevention structure, are all fitted with sandwich sealing kits 3 to form a seamless sealing protection. At the same time, a leakage monitoring system 4 is buried inside the layered seepage prevention structure 2 to monitor the seepage prevention status in real time and provide timely warnings when leakage occurs.

[0025] like Figure 2 As shown, the layered seepage prevention structure 2 consists of, from bottom to top, a base leveling layer 21, a rigid seepage prevention layer 22, an elastic buffer layer 23, and a protective layer 24. The base leveling layer 21 is laid with cement mortar, with a thickness controlled at 5-8cm. It can level the bottom and side walls of the pool and reinforce the structure, preventing sharp debris from puncturing the upper seepage prevention structure. The rigid seepage prevention layer 22 is poured with corrosion-resistant concrete containing a penetrating crystalline waterproofing agent, with a thickness of 10-15cm and a permeability coefficient not greater than 1×10⁻. 7 The first high-strength seepage barrier is formed by the flow rate of the geotextile, which can simultaneously resist the reverse seepage of groundwater and the outflow of sewage from the pool. The elastic buffer layer 23 is made of modified rubber pads with a thickness of 3-5cm. It has good elasticity and tensile strength, which can buffer the structural stress caused by wetland matrix settlement and water impact, and prevent the rigid seepage barrier layer 22 from cracking and breaking. The protective layer 24 is made of needle-punched geotextile with a weight of 300-400g / ㎡, which covers the elastic buffer layer 23 to prevent sharp particles in the wetland matrix from puncturing and damaging the underlying seepage barrier layer, and to ensure the long-term stability of the overall seepage barrier structure.

[0026] like Figure 3As shown, the sandwich sealing kit 3 adopts a composite structure design with raised connecting parts at both ends. Sealing grooves are opened on the surface of the connecting parts and filled with sealant to ensure a tight fit between adjacent kits and no leakage channels. The main body of the kit consists of a middle support layer 31, a left sealing layer 32, and a right sealing layer 33, forming a sandwich structure. The middle support layer 31 is made of high-strength carbon fiber composite material, with a thickness of 2-3 cm and elastic protrusions of 0.5-1 cm in height distributed on its surface. This enhances the overall structural strength and compressive strength, and provides continuous elastic support for the sealing layers on both sides, ensuring a tight fit between the sealing layers and the seepage-proof structure. The left and right sealing layers 33 are both made of water-swellable rubber, with a thickness of 1-2 cm and coated with an antimicrobial erosion coating. They can expand 2-3 times their original size when exposed to water, automatically filling the sealing gaps to achieve adaptive sealing, while also resisting microbial erosion in wetland environments and extending their service life. The sealing kit adapts to different structural forms depending on the installation location. At the splicing of the layered anti-seepage structure 2, the kit is embedded in the gap, and the sealing layers on both sides are respectively attached to the anti-seepage structures on both sides. The joint is sealed with sealant, and a double seal is formed with the elastic protrusion of the middle support layer 31. At the corner of the pool, an arc-shaped sealing kit is used. The radius of the arc is consistent with the corner radius of the water distribution channel 01, the filter pool 02, and the water collection channel 03, which completely fits the anti-seepage surface of the corner and avoids stress concentration that could lead to seal failure. At the connection between the water distribution and collection pipes and the anti-seepage structure, the kit is fitted onto the outer wall of the pipe. One side of the sealing layer is attached to the pipe, and the other side is attached to the anti-seepage structure. The joint is sealed to achieve a seamless connection between the pipe and the anti-seepage structure and prevent sewage from leaking along the pipe wall.

[0027] like Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the leakage monitoring system 4 consists of leakage sensors 43, a data acquisition unit 42, and a monitoring terminal 41. The leakage sensors 43 are evenly arranged between the elastic buffer layer 23 and the protective layer 24, and adopt a corrosion-resistant and waterproof design to adapt to the humid and corrosive environment of wetlands. They can collect data such as leakage volume and leakage location in real time. The data acquisition unit 42 is connected to the leakage sensors 43 via a wire 431. The end of the wire 431 is provided with a female connector 432, which is plugged into the male connector 421 at the rear of the data acquisition unit 42 to achieve stable data acquisition and transmission. The front end of the data acquisition unit 42 is connected to the connector 417 on the back of the monitoring terminal 41 via a connecting cable 422 with a connecting plug 423 to upload the data to the monitoring terminal 41. The monitoring terminal 41 has an industrial display screen 411 on the front and a control unit 413 below. It has ventilation holes 412 on the side and a base plate 415 with bolt holes 416 connected to the bottom via support feet 414 for easy fixing. A power cable 418 is located on the side of the monitoring terminal 41, with a power plug 419 at one end. The power cable 418 and power plug 419 facilitate power supply to the entire monitoring terminal 41, ensuring smooth operation of the system. The monitoring terminal 41 integrates a control module, a display module, a leakage monitoring module, an alarm module, and a power supply module. The control module coordinates system operation, the display module presents monitoring data in real time, the leakage monitoring module continuously detects leakage, the alarm module automatically issues an alarm and accurately locates the leakage point when the leakage exceeds a preset threshold, and the power supply module provides stable power support for the entire system.

[0028] like Figure 9 and Figure 10 As shown, the water distribution system 5 includes a main water distribution pipe 51, an inlet butterfly valve 52, and branch water distribution pipes 53. The inlet butterfly valve 52 is installed at the open end of the main water distribution pipe 51. A first rotating handle 521 is set on the top of the butterfly valve. The handle is higher than the water surface of the water distribution channel 01, which facilitates manual operation for opening and closing and flow adjustment. Multiple branch water distribution pipes 53 are evenly distributed along the length of both sides of the main water distribution pipe 51. Multiple water distribution nozzles 531 are opened at the bottom of each branch pipe to ensure that the sewage is evenly distributed into the filter tank 02. The water collection system 6 consists of a main water collection pipe 61, an outlet butterfly valve 62, and water collection branch pipes 63. An outlet butterfly valve 62 is installed at the outlet end of the main water collection pipe 61. A second rotating handle 621 is set on the top of the outlet butterfly valve 62. The handle is higher than the water collection channel 03 for easy operation and maintenance. Multiple water collection branch pipes 63 are evenly arranged on both sides of the main water collection pipe 61. Multiple funnels 631 are set on the top of the branch pipes. The opening of the funnels 631 is fixed with filter cloth 632 by binding rings 633, which can intercept matrix particles, prevent pipe blockage, and ensure smooth water collection.

[0029] Example 2 like Figure 1As shown in the figure, this embodiment discloses a subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit 3. The entire system is based on a wetland pool body 1 as the supporting structure. The interior of the wetland pool body 1 is divided into three functional areas: a water distribution channel 01, a filtration pool 02, and a water collection channel 03 by a layered seepage prevention structure 2. The bottom and walls of the pool are fully covered with the layered seepage prevention structure 2 to form a complete seepage prevention base. The water distribution system 5 is installed between the water distribution channel 01 and the filtration pool 02, with the inlet end located in the water distribution channel 01 and the outlet end extending into the filtration pool 02. The water collection system 6 is correspondingly installed between the water collection channel 03 and the filtration pool 02, with the outlet end located in the water collection channel 03 and the inlet end located in the filtration pool 02. The two hydraulic systems work together to achieve uniform sewage distribution and stable collection of purified water. The joints and corners of the layered seepage prevention structure 2, as well as the connection points between the water distribution system 5, the water collection system 6 and the seepage prevention structure, are all fitted with sandwich sealing kits 3 to form a seamless sealing protection. At the same time, a leakage monitoring system 4 is buried inside the layered seepage prevention structure 2 to monitor the seepage prevention status in real time and provide timely warnings when leakage occurs.

[0030] like Figure 2 As shown, the layered seepage prevention structure 2 consists of, from bottom to top, a base leveling layer 21, a rigid seepage prevention layer 22, an elastic buffer layer 23, and a protective layer 24. The base leveling layer 21 is laid with cement mortar, with a thickness controlled at 5-8cm. It can level the bottom and side walls of the pool and reinforce the structure, preventing sharp debris from puncturing the upper seepage prevention structure. The rigid seepage prevention layer 22 is poured with corrosion-resistant concrete containing a penetrating crystalline waterproofing agent, with a thickness of 10-15cm and a permeability coefficient not greater than 1×10⁻. 7 The first high-strength seepage barrier is formed by the flow rate of the geotextile, which can simultaneously resist the reverse seepage of groundwater and the outflow of sewage from the pool. The elastic buffer layer 23 is made of modified rubber pads with a thickness of 3-5cm. It has good elasticity and tensile strength, which can buffer the structural stress caused by wetland matrix settlement and water impact, and prevent the rigid seepage barrier layer 22 from cracking and breaking. The protective layer 24 is made of needle-punched geotextile with a weight of 300-400g / ㎡, which covers the elastic buffer layer 23 to prevent sharp particles in the wetland matrix from puncturing and damaging the underlying seepage barrier layer, and to ensure the long-term stability of the overall seepage barrier structure.

[0031] like Figure 3As shown, the sandwich sealing kit 3 adopts a composite structure design with raised connecting parts at both ends. Sealing grooves are opened on the surface of the connecting parts and filled with sealant to ensure a tight fit between adjacent kits and no leakage channels. The main body of the kit consists of a middle support layer 31, a left sealing layer 32, and a right sealing layer 33, forming a sandwich structure. The middle support layer 31 is made of high-strength carbon fiber composite material, with a thickness of 2-3 cm and elastic protrusions of 0.5-1 cm in height distributed on its surface. This enhances the overall structural strength and compressive strength, and provides continuous elastic support for the sealing layers on both sides, ensuring a tight fit between the sealing layers and the seepage-proof structure. The left and right sealing layers 33 are both made of water-swellable rubber, with a thickness of 1-2 cm and coated with an antimicrobial erosion coating. They can expand 2-3 times their original size when exposed to water, automatically filling the sealing gaps to achieve adaptive sealing, while also resisting microbial erosion in wetland environments and extending their service life. The sealing kit adapts to different structural forms depending on the installation location. At the splicing of the layered anti-seepage structure 2, the kit is embedded in the gap, and the sealing layers on both sides are respectively attached to the anti-seepage structures on both sides. The joint is sealed with sealant, and a double seal is formed with the elastic protrusion of the middle support layer 31. At the corner of the pool, an arc-shaped sealing kit is used. The radius of the arc is consistent with the corner radius of the water distribution channel 01, the filter pool 02, and the water collection channel 03, which completely fits the anti-seepage surface of the corner and avoids stress concentration that could lead to seal failure. At the connection between the water distribution and collection pipes and the anti-seepage structure, the kit is fitted onto the outer wall of the pipe. One side of the sealing layer is attached to the pipe, and the other side is attached to the anti-seepage structure. The joint is sealed to achieve a seamless connection between the pipe and the anti-seepage structure and prevent sewage from leaking along the pipe wall.

[0032] like Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the leakage monitoring system 4 consists of leakage sensors 43, a data acquisition unit 42, and a monitoring terminal 41. The leakage sensors 43 are evenly arranged between the elastic buffer layer 23 and the protective layer 24, and adopt a corrosion-resistant and waterproof design to adapt to the humid and corrosive environment of wetlands. They can collect data such as leakage volume and leakage location in real time. The data acquisition unit 42 is connected to the leakage sensors 43 via a wire 431. The end of the wire 431 is provided with a female connector 432, which is plugged into the male connector 421 at the rear of the data acquisition unit 42 to achieve stable data acquisition and transmission. The front end of the data acquisition unit 42 is connected to the connector 417 on the back of the monitoring terminal 41 via a connecting cable 422 with a connecting plug 423 to upload the data to the monitoring terminal 41. The monitoring terminal 41 has an industrial display screen 411 on the front and a control unit 413 below. It has ventilation holes 412 on the side and a base plate 415 with bolt holes 416 connected to the bottom via support feet 414 for easy fixing. A power cable 418 is located on the side of the monitoring terminal 41, with a power plug 419 at one end. The power cable 418 and power plug 419 facilitate power supply to the entire monitoring terminal 41, ensuring smooth operation of the system. The monitoring terminal 41 integrates a control module, a display module, a leakage monitoring module, an alarm module, and a power supply module. The control module coordinates system operation, the display module presents monitoring data in real time, the leakage monitoring module continuously detects leakage, the alarm module automatically issues an alarm and accurately locates the leakage point when the leakage exceeds a preset threshold, and the power supply module provides stable power support for the entire system.

[0033] like Figure 9 and Figure 10 As shown, the water distribution system 5 includes a main water distribution pipe 51, an inlet butterfly valve 52, and branch water distribution pipes 53. The inlet butterfly valve 52 is installed at the open end of the main water distribution pipe 51. A first rotating handle 521 is set on the top of the butterfly valve. The handle is higher than the water surface of the water distribution channel 01, which facilitates manual operation for opening and closing and flow adjustment. Multiple branch water distribution pipes 53 are evenly distributed along the length of both sides of the main water distribution pipe 51. Multiple water distribution nozzles 531 are opened at the bottom of each branch pipe to ensure that the sewage is evenly distributed into the filter tank 02. The water collection system 6 consists of a main water collection pipe 61, an outlet butterfly valve 62, and water collection branch pipes 63. An outlet butterfly valve 62 is installed at the outlet end of the main water collection pipe 61. A second rotating handle 621 is set on the top of the outlet butterfly valve 62. The handle is higher than the water collection channel 03 for easy operation and maintenance. Multiple water collection branch pipes 63 are evenly arranged on both sides of the main water collection pipe 61. Multiple funnels 631 are set on the top of the branch pipes. The opening of the funnels 631 is fixed with filter cloth 632 by binding rings 633, which can intercept matrix particles, prevent pipe blockage, and ensure smooth water collection.

[0034] like Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 and Figure 16 As shown, the system is also equipped with a rapid repair system 7. This system uses a support base 71 as its installation foundation. The support base 71 has support rods 711 at the bottom corners and a bottom frame 712 with bottom holes 713 at the bottom, which can be fixed in position with bolts to ensure overall stability. A repair agent storage tank 72 and a high-pressure grouting pump 74 are installed on the support base 71. The repair agent storage tank 72 is made of stainless steel and has a volume of 500-1000L. The repair agent storage tank 72 is equipped with a liquid level monitoring device. A suction pipe 721 with a first flange 722 is located on the bottom side. A filling port 726 and a cover 727 are located on the top. A bearing 728 is located in the middle for connecting the mixing assembly 73. The mixing motor 731 is fixed at the top by a mounting bracket 729. The top of the mounting bracket 729 has a mounting plate 7291 with multiple mounting holes 7292. The mounting plate 7291 is for easy and stable connection with the mixing motor 731. The bottom of the repair agent storage tank 72 is provided with multiple support rods 723, and the bottom of the support rods 723 is provided with a base plate 724. The base plate 724 is provided with multiple fixing holes 725 for fixing the repair agent storage tank 72 to the support base 71 by bolts passing through the fixing holes 725. The stirring assembly 73 consists of a stirring motor 731 and a stirring rod 732. The stirring motor 731 is fixed to the top of the mounting bracket 729 by a connecting plate 7311. The connecting plate 7311 is provided with multiple connecting holes 7312. The connecting plate 7311 fits against the mounting plate and is bolted through the mounting plate. Hole 7292 and connecting hole 7312 are provided to fix the stirring motor 731 to the top of the mounting bracket 729; the output end drive shaft 7313 and the stirring rod 732 are connected to the splicing plate 7321 with splicing hole 7322, and the corner plate 7323 is used to enhance the structural strength. The motor can drive the stirring rod 732 to fully stir the repair agent in the tank. The repair agent is made of polyurethane and water-swellable rubber particles mixed in a mass ratio of 6-7:3-4. The water-swellable ratio is 2.5-3 times, the bonding strength is not less than 2.0MPa, and it has good sealing and bonding performance. The high-pressure grouting pump 74 has a base 743 with a perforation 744 at its bottom, which is fixed to the support 71 by bolts. The pump body has a suction pipe 745 and a discharge pipe 741. The third flange 746 at the end of the suction pipe 745 is connected to the first flange 722 of the repair agent storage tank 72. The second flange 742 at the end of the discharge pipe 741 is connected to the grouting assembly 75. The grouting assembly 75 consists of an injection needle 751 and a guide pipe 752. The bottom of the injection needle 751 has a handle 7511 and a threaded connector. 7512, the end adapter cap 7521 of the feed pipe 752 is threadedly connected to the threaded joint 7512, and the other end is provided with an installation joint 7522 with a fourth flange 7523, which is connected to the second flange 742 of the discharge pipe 741. After the monitoring terminal 41 locates the leakage point, the staff can insert the injection needle 751 into the leakage position and start the high-pressure grouting pump 74 to inject the repair agent into the leakage area, so as to quickly complete the leakage sealing and repair without damaging the wetland matrix or stopping the system operation.

[0035] Working Principle: This subsurface flow wetland seepage prevention enhancement system based on sandwich sealing kit 3 uses the wetland pool 1 as its foundation. A layered seepage prevention structure 2, consisting of a base leveling layer 21, a rigid seepage prevention layer 22, an elastic buffer layer 23, and a protective layer 24, forms a complete seepage prevention base on the pool bottom and walls. The sandwich sealing kit 3 is embedded in the joints, corners, and connection points between the water distribution and collection system 6 and the seepage prevention structure 2. Utilizing its sandwich structure, water-swellable sealing layer, and sealant, a seamless seal is achieved. Simultaneously, the seepage monitoring system 4 within the layered seepage prevention structure 2 collects seepage data in real time via seepage sensors 43 and uploads it to [the relevant system / platform]. The monitoring terminal 41 automatically alarms and locates the leakage point when leakage exceeds the standard. Wastewater enters the water distribution system 5 through the water distribution channel 01. After being purified by the water distribution system 5, it is evenly distributed into the filter tank 02 and then stably collected by the water collection system 6 and discharged into the water collection channel 03. When leakage is detected, the staff can inject a repair agent made of polyurethane and water-swellable rubber particles into the leakage point under high pressure through the matching rapid repair system 7. The rapid sealing and repair can be completed without damaging the wetland matrix or stopping the system operation. The whole process realizes the integration of seepage prevention, sealing, monitoring and repair, effectively preventing the reverse infiltration of groundwater and the seepage of sewage in the pool, and ensuring the long-term stable seepage prevention operation of the subsurface flow wetland.

[0036] In summary, compared with the prior art, this application provides a sandwich sealing kit 3, which adopts a composite structure of a left sealing layer 32, a middle support layer 31, and a right sealing layer 33. This breaks through the limitations of the single structure of traditional sealing components. The middle support layer 31 provides high-strength support, and the water-swellable sealing layers on both sides achieve adaptive sealing. After encountering water, they can automatically fill the sealing gap, solving the technical problem of poor fit and easy leakage channels in traditional sealing structures. The sealing performance is greatly improved. At the same time, the antimicrobial erosion coating and high-strength carbon fiber middle layer on the surface of the sandwich sealing kit 3 effectively improve the sealing kit's anti-aging, anti-puncture, and anti-corrosion capabilities, and significantly reduce maintenance costs. The system employs a layered seepage-proof structure 2 and a sandwich sealing kit 3 working in synergy. The layered seepage-proof structure 2 progresses layer by layer from the base leveling layer 21 to the protective layer 24. The rigid seepage-proof layer 22 is combined with the elastic buffer layer 23, ensuring both seepage prevention and adaptability to wetland substrate settlement and water impact, preventing cracking of the seepage-proof structure. The sandwich sealing kit 3 is precisely embedded at the joints, corners, and pipe connections of the seepage-proof structure, achieving a complete seal without dead angles, and completely solving the pain point of easy leakage at joints and corners in existing seepage-proof systems. It integrates a leakage monitoring system 4 and a rapid repair system 7. The leakage sensor 43 can monitor the leakage situation in real time, accurately locate the leakage point, and the monitoring terminal 41 automatically alarms. The repair system 7 can quickly complete the repair of leakage points without damaging the wetland substrate and vegetation or stopping the wetland operation through high-pressure grouting. This solves the technical problems of difficult leakage point location, inconvenient repair, and impact on wetland operation in existing seepage-proof systems, greatly improving the system's operation and maintenance efficiency and reducing operation and maintenance costs. The sandwich sealing kit 3 can be designed with corresponding structural forms according to different installation locations (joints, corners, pipe connections), and seamlessly connects with the layered anti-seepage structure 2, water distribution system 5, and water collection system 6. It does not affect the hydraulic conduction inside the wetland and avoids matrix blockage, ensuring the sewage treatment efficiency of the subsurface flow wetland. At the same time, the system is easy to construct, and the installation of the layered anti-seepage structure 2 and the sandwich sealing kit 3 can be carried out simultaneously, shortening the construction cycle by more than 30%. It is suitable for the construction of subsurface flow wetlands of various scales and under various working conditions, and has strong practicality.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., 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 subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit, characterized in that, include: Wetland pool (1), the wetland pool (1) is used to support various components and realize the treatment of sewage; Layered seepage prevention structure (2), the layered seepage prevention structure (2) is laid on the bottom and wall of the wetland pool (1), the layered seepage prevention structure (2) divides the wetland pool (1) into three parts, from left to right: water distribution channel (01), filter pool (02) and water collection channel (03). Water distribution system (5), the water inlet of the water distribution system (5) is located in the water distribution channel (01), and the water outlet of the water distribution system (5) is located inside the filter tank (02); The water collection system (6) has its outlet end located in the water collection channel (03) and its inlet end located inside the filter tank (02). The sandwich sealing kit (3) is embedded in the splice, corner and connection of the layered seepage prevention structure (2) with the water distribution system (5) and the water collection system (6); Leakage monitoring system (4), which is buried inside the layered seepage prevention structure (2) and is used to provide timely warnings when leakage occurs.

2. The subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit according to claim 1, characterized in that, The layered seepage prevention structure (2) includes, from bottom to top, a base leveling layer (21), a rigid seepage prevention layer (22), an elastic buffer layer (23), and a protective layer (24). The base leveling layer (21) is laid with cement mortar and is used to level and reinforce the bottom and walls of the wetland pool (1) to prevent sharp debris from piercing the subsequent seepage prevention structure. The rigid seepage prevention layer (22) is made of corrosion-resistant concrete with a penetrating crystalline waterproofing agent added to it to form the first seepage barrier to resist groundwater backflow and sewage infiltration. The elastic buffer layer (23) is laid with modified rubber pads, which have good elasticity and tensile strength. It is used to buffer the force of wetland matrix settlement and water impact on the seepage prevention structure to prevent the rigid seepage prevention layer (22) from cracking. The protective layer (24) is laid with needle-punched geotextile to protect the elastic buffer layer (23) and the rigid seepage prevention layer (22) from being pierced by sharp particles in the wetland matrix.

3. The subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit according to claim 1, characterized in that, The sandwich sealing kit (3) has protruding connecting parts at both ends, and sealing grooves are provided on the surface of the connecting parts. The sealing grooves are filled with sealant to achieve a tight connection between adjacent sealing kits and avoid the formation of leakage channels at the connection. The sandwich sealing kit (3) includes a middle support layer (31), a left sealing layer (32) and a right sealing layer (33), forming a sandwich composite structure of "left sealing layer (32) - middle support layer (31) - right sealing layer (33)". The middle support layer (31) is made of high-strength carbon fiber composite material and has uniformly distributed elastic protrusions on its surface to enhance the structural strength and compressive strength of the sealing kit, while providing elastic support for the sealing layers on both sides to ensure that the sealing layers are tightly fitted to the layered seepage prevention structure (2). The left sealing layer (32) and the right sealing layer (33) are both made of water-swellable rubber and coated with an antimicrobial erosion coating to fill the sealing gap and achieve adaptive sealing. The antimicrobial erosion coating can effectively resist the erosion of microorganisms in wetlands and extend the service life of the sealing kit.

4. A subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit according to claim 3, characterized in that, The installation method of the sandwich sealing kit (3) is designed to adapt to different parts: at the splicing of the layered seepage prevention structure (2), the sandwich sealing kit (3) is embedded in the splicing gap, the left sealing layer (32) is attached to one side of the seepage prevention structure, the right sealing layer (33) is attached to the other side of the seepage prevention structure, the joint is sealed with sealant, and the elastic protrusion of the middle support layer (31) is in close contact with the splicing gap to form a double seal; at the corner of the layered seepage prevention structure (2), an arc-shaped sandwich sealing kit (3) is used, the arc radius is the same as the water distribution channel (01) and filter pool of the layered seepage prevention structure (2). (02) and the corner radius of the water collection channel (03) are consistent to ensure that the sealing kit is fully fitted with the layered anti-seepage structure (2) at the corner, and to avoid the failure of the seal due to stress concentration at the corner; at the junction of the water distribution system (5), the water collection system (6) and the layered anti-seepage structure (2), the sandwich sealing kit (3) is fitted on the outer wall of the water distribution pipe and the water collection pipe, the left sealing layer (32) is fitted with the outer wall of the pipe, the right sealing layer (33) is fitted with the layered anti-seepage structure (2), and the joint is sealed with sealant to achieve seamless connection between the pipe and the layered anti-seepage structure (2) and prevent sewage from leaking along the outer wall of the pipe.

5. A subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit according to claim 2, characterized in that, The leakage monitoring system (4) includes several leakage sensors (43), a data acquisition unit (42), and a monitoring terminal (41). The leakage sensors (43) are evenly embedded between the elastic buffer layer (23) and the protective layer (24) to monitor leakage in real time and collect data such as leakage volume and leakage location. The leakage sensors (43) adopt a corrosion-resistant and waterproof design, which is suitable for wetland humid and corrosive environments. The data acquisition unit (42) is electrically connected to the leakage sensors (43) to receive the data collected by the leakage sensors (43) and transmit the data to the monitoring terminal (41). The monitoring terminal (41) displays the leakage monitoring data in real time. When the leakage volume exceeds the preset threshold, it automatically issues an alarm signal and locates the leakage point, providing accurate guidance for repair work.

6. A subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit according to claim 5, characterized in that, The monitoring terminal (41) has an industrial display screen (411) on its front. A control unit (413) is located below the industrial display screen (411) on the monitoring terminal (41). A heat dissipation hole (412) is located on one side of the monitoring terminal (41). A support foot (414) is located at the bottom of the monitoring terminal (41). A base plate (415) is located at the bottom of the support foot (414). Multiple bolt holes (416) are located on the base plate (415). Multiple connectors (417) are located on the back of the monitoring terminal (41). A connecting cable (422) is located on the side of the monitoring terminal (41). A connecting plug (423) is located at the end of the connecting cable (422). The monitoring terminal (41) is provided with a connecting wire (418) on its side, and a power plug (419) is provided at the end of the connecting wire (418); the monitoring terminal (41) integrates a control module, which is connected to a display module, a leakage monitoring module, an alarm module and a power supply module. The control module is used to control the entire monitoring terminal (41), the display module works with the industrial display screen (411) to detect the monitored data, the leakage monitoring module is used to monitor the leakage of the wetland pool (1), the alarm module is used to issue an alarm when the leakage monitoring module detects leakage, and the power supply module is used to supply power to the entire leakage monitoring system (4).

7. A subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit according to claim 6, characterized in that, The data acquisition device (42) has a connecting line (422) at the front end and a connecting plug (423) at the end of the connecting line (422). The connecting plug (423) is connected to the connecting connector (417). The data acquisition device (42) has multiple male connectors (421) at the rear end. The leakage sensor (43) has a wire (431) connected to the top. The wire (431) has a female connector (432) at the end of the wire (431). The female connector (432) is electrically connected to the male connector (421).

8. A subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit according to claim 1, characterized in that, The water distribution system (5) includes a main water distribution pipe (51), an inlet butterfly valve (52), and branch water distribution pipes (53). The main water distribution pipe (51) is equipped with an inlet butterfly valve (52) at its open end. Multiple branch water distribution pipes (53) are arranged on both sides of the main water distribution pipe (51) from front to back. Multiple water distribution nozzles (531) are provided at the bottom of each branch water distribution pipe (53). A first rotating handle (521) is provided at the top of the inlet butterfly valve (52). The top of the first rotating handle (521) is higher than the water distribution channel (01).

9. A subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit according to claim 1, characterized in that, The water collection system (6) includes a main water collection pipe (61), an outlet butterfly valve (62), and water collection branch pipes (63). The outlet end of the main water collection pipe (61) is provided with an outlet butterfly valve (62), and the top of the outlet butterfly valve (62) is provided with a second rotating handle (621), which is higher than the water collection channel (03). Multiple water collection branch pipes (63) are evenly arranged on both sides of the main water collection pipe (61) from front to back. Multiple funnels (631) are evenly arranged on the top of the water collection branch pipes (63). A filter cloth (632) is tied to the top opening of the funnel (631) by a binding ring (633).

10. A subsurface flow wetland seepage prevention enhancement system based on a sandwich sealing kit according to any one of claims 1-9, characterized in that, It also includes a repair system (7), which includes a support base (71), a repair agent storage tank (72), a stirring assembly (73), a high-pressure grouting pump (74), and a grouting assembly (75); the repair agent storage tank (72) and the high-pressure grouting pump (74) are mounted on the support base (71), and the suction end of the high-pressure grouting pump (74) is connected to the repair agent storage tank (72). The repair agent storage tank (72) is equipped with a stirring assembly (73) for stirring and mixing the repair agent; the discharge end of the high-pressure grouting pump (74) is connected to the grouting assembly (75).

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