Redundant anti-seepage structure and coagulation sedimentation tank

Abstract

This invention relates to the field of wastewater treatment technology, and more particularly to redundant anti-seepage structures and coagulation sedimentation tanks. The invention includes a fixed anti-seepage structure positioned between a connecting pipe and a reinforced concrete layer. The fixed anti-seepage structure also includes a bonding layer positioned outside the connecting pipe. Furthermore, it includes a supporting anti-seepage structure positioned between a circulation pipe and the connecting pipe. A flexible anti-seepage structure is also provided between the circulation pipe and the connecting pipe. The flexible anti-seepage structure includes a first waterproof membrane layer positioned on the inner wall of the connecting pipe and a second waterproof membrane layer positioned on the outer wall of the circulation pipe. A waterproof filling layer is provided between the first and second waterproof membrane layers. The fixed anti-seepage structure achieves long-term stable anti-seepage between the connecting pipe and the reinforced concrete layer. The flexible anti-seepage structure reduces the impact of circulation pipe vibration on the connecting pipe. Moreover, the flexible anti-seepage structure effectively reduces the porosity during circulation pipe vibration, ensuring long-term anti-seepage performance.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to redundant anti-seepage structures and coagulation sedimentation tanks. Background Technology

[0002] The influent to the coagulation sedimentation tank comes from the effluent from the secondary sedimentation tank to the booster pump station and deep bed filter. The coagulation section is divided into three sections: coagulation reaction tank, media reaction tank, and flocculation reaction tank. Coagulant is added to the coagulation reaction tank, coagulant aid is added to the media reaction tank and flocculation reaction tank, and sand is added to the media reaction tank. The sedimentation section retains the wastewater and causes it to rise, thus completing the coagulation sedimentation.

[0003] The coagulation sedimentation tank is constructed of reinforced concrete, possessing high corrosion resistance and inherent seepage prevention properties. Due to its large volume and long service life, redundant seepage prevention structures are built into the tank body during construction. These redundant structures include, from bottom to top, a compacted subsoil layer, a waterproof cushion layer, a waterproof membrane layer, a waterproof protective layer, a waterproof concrete layer, and a waterproof surface layer. The compacted subsoil layer contains pile foundations, specifically friction piles, to resist settlement. The waterproof cushion layer consists of a mortar layer (waterproof mortar) placed on the surface of the compacted subsoil layer, providing a good foundation for the waterproof membrane and protecting it during use. To prevent the waterproof membrane from cracking, the waterproof membrane layer consists of 3-4 layers of waterproof membrane, some of different and some of the same material, for redundant seepage prevention. The waterproof protective layer includes a second mortar layer laid on the surface of the waterproof membrane layer, reinforced with internal reinforcement, which forms the bottom mold of the reinforced concrete layer after molding. The waterproof concrete layer includes a reinforced concrete layer poured on the surface of the second mortar layer, with a pre-embedded connecting pipe embedded in it. The connecting pipe is a prefabricated pipe with pre-formed waterproof flanges at both ends, thus achieving seepage prevention between the connecting pipe and the reinforced concrete layer. The waterproof surface layer includes a third mortar layer laid on the surface of the waterproof concrete layer. The third mortar layer is a high-strength mortar with good wear resistance.

[0004] After the pool construction is completed, equipment is installed, including mixing equipment, dosing equipment, and circulation equipment. The circulation equipment includes circulation pipes installed inside the connecting pipes. The circulation pipes are made of welded steel pipes and are installed inside the connecting pipes to facilitate maintenance. The circulation pipes are connected to a mud pump to discharge the sludge from the bottom of the pool. The sludge contains mud, sand, air bubbles, etc., which will generate vibration during use, thus deteriorating the sealing between the circulation pipes and the connecting pipes, and even affecting the sealing performance between the connecting pipes and the reinforced concrete. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a redundant seepage-proof structure and a coagulation sedimentation tank.

[0006] This invention is achieved through the following technical solution: a redundant seepage-proof structure, comprising a fixed seepage-proof structure disposed between a connecting pipe and a reinforced concrete layer, the fixed seepage-proof structure including a waterproof wing ring disposed outside the connecting pipe, the fixed seepage-proof structure also including a bonding layer disposed outside the connecting pipe, the bonding layer being distributed at least at both ends of the connecting pipe, and a supporting seepage-proof structure disposed between a circulation pipe and the connecting pipe, the supporting seepage-proof structure including a supporting skeleton distributed at least inside the lower side of the connecting pipe, and a flexible seepage-proof structure disposed between the circulation pipe and the connecting pipe, the flexible seepage-proof structure including a waterproof membrane layer one disposed on the inner wall of the connecting pipe and a waterproof membrane layer two disposed on the outer wall of the circulation pipe, a waterproof filling layer disposed between the waterproof membrane layer one and the waterproof membrane layer two.

[0007] Furthermore, the bonding layer has a thickness of 2-3 mm and is made of the following raw materials in parts by weight: 100-120 parts of E-51 epoxy resin, 30-40 parts of polyamide curing agent, 80-120 parts of quartz powder, and 1.5-3 parts of silane coupling agent. During construction, after the bonding layer is coated on the outside of the connecting pipe, it is placed at the predetermined position, and then concrete is poured to obtain a reinforced concrete layer, and the connecting pipe is pre-embedded.

[0008] Furthermore, the first waterproof membrane layer is made of chlorinated polyethylene waterproof membrane with a thickness of 3-4 mm, and the first waterproof membrane layer is bonded to the inner wall of the connecting pipe by polyurethane adhesive.

[0009] Furthermore, the second waterproof membrane layer is made of TPO waterproof membrane with a thickness of 5-8mm, and the second waterproof membrane layer is bonded to the circulation pipe by hot melt bonding.

[0010] Furthermore, the supporting frame includes multiple steel wires with an outer diameter of 4mm set on the first waterproof membrane layer. The steel wires are distributed along the length of the connecting pipe. High-flow mortar is laid at the supporting frame. The high-flow mortar is made of the following raw materials in parts by weight: 10 parts silicate cement, 17 parts medium and fine sand, 3 parts fly ash, 3 parts polycarboxylate-based high-efficiency water-reducing agent, and 15 parts water. The particle size range of the medium and fine sand is 0.16-0.63mm. The laying thickness is 10mm. After laying, the high-flow mortar flows by itself. Before the high-flow mortar cures, a circulation pipe is installed in the connecting pipe. The circulation pipe squeezes the high-flow mortar. After the circulation pipe is laid, a gap to be filled is formed between the first waterproof membrane layer and the second waterproof membrane layer. A waterproof filling layer is set in the gap to be filled.

[0011] Furthermore, the waterproof filling layer is made of high-hardness rigid polyurethane foam, which is injected from both ends of the gap to be filled toward the middle.

[0012] A coagulation sedimentation tank includes a coagulation reaction tank, a media reaction tank, a flocculation reaction tank, and a sedimentation tank. A connecting pipe is laid at the bottom of the sedimentation tank, and a circulation pipe is installed inside the connecting pipe. The sedimentation tank is equipped with a redundant anti-seepage structure.

[0013] The beneficial effects of this invention are as follows: 1. A fixed seepage-proof structure is used to achieve long-term stable seepage prevention between the connecting pipe and the reinforced concrete layer. A flexible seepage-proof structure is used to reduce the impact of the vibration of the circulating pipe on the connecting pipe. In addition, the flexible seepage-proof structure can effectively reduce the porosity during the vibration of the circulating pipe, ensuring a long-term seepage prevention effect.

[0014] 2. During maintenance, the wear-resistant layer is maintained first. If the maintenance meets the usage standards, it can continue to be used. If both the wear-resistant layer and the circulation pipe are damaged, the flexible seepage-proof structure can be softened by heating the circulation pipe, allowing the circulation pipe to be pulled out for replacement. This facilitates maintenance. The entire structure from the waterproof membrane layer inwards is replaced, resulting in high construction efficiency. It is especially suitable for circulation pipes shorter than 10m and can meet the needs of most sizes of coagulation sedimentation tanks. Attached Figure Description

[0015] Figure 1 This is a top view of a coagulation sedimentation tank. Figure 2 This is a schematic diagram of a sedimentation tank. Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle; Figure 4 This is a schematic diagram of a flexible seepage-proof structure.

[0016] The components include: 1. Coagulation reaction tank; 2. Media reaction tank; 3. Flocculation reaction tank; 4. Inlet pipe; 5. Circulation pump; 6. Sedimentation tank; 7. Mixing structure; 8. Mud pump; 9. Hanger; 10. Reinforced concrete layer; 11. Friction pile; 12. Compacted subsoil layer; 13. Mortar layer one; 14. Waterproof membrane layer; 15. Mortar layer two; 16. Connecting pipe; 17. Bonding layer; 18. Waterproof wing ring; 19. Waterproof membrane layer one; 20. Circulation pipe; 21. Wear-resistant layer; 22. Waterproof filling layer; 23. Waterproof membrane layer two; 24. High-flow mortar; 25. Steel wire. Detailed Implementation

[0017] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 like Figure 3-4 As shown, a redundant seepage prevention structure includes a fixed seepage prevention structure disposed between the connecting pipe 16 and the reinforced concrete layer 10, and a supporting seepage prevention structure and a flexible seepage prevention structure disposed between the circulation pipe 20 and the connecting pipe 16, thereby achieving multi-level, highly stable seepage prevention and protection.

[0020] The connecting pipe 16 is a precast pipe with a waterproof flange 18 precast on its outer wall. The outer wall of the pipe is coated with a bonding layer 17 to form a fixed anti-seepage structure. In this embodiment, the bonding layer 17 has a coating thickness of 2mm, covering at least both ends of the connecting pipe 16. The bonding layer 17, by weight, is made by thoroughly mixing 100kg of E-51 epoxy resin, 30kg of polyamide curing agent, 80kg of quartz powder, and 1.5kg of silane coupling agent. The average particle size of the quartz powder is 0.5mm. This resin bonding layer, through chemical bonding, penetration filling, interface strengthening, and micro-mechanical interlocking, eliminates the weak interface transition zone between the precast pipe and the post-cast concrete, forming an integral bonding structure, significantly improving the interface's shear, tensile, and thermal strength. The slip resistance is improved, thus significantly enhancing the bonding performance between the reinforced precast pipe and the concrete. After the bonding layer 17 is coated, the connecting pipe 16 is placed at the predetermined pouring position of the reinforced concrete layer 10. The subsequent pouring of concrete completes the pre-embedding of the connecting pipe 16. Through the combined effects of chemical bonding, penetration filling, interface strengthening, and micro-mechanical interlocking, the bonding layer 17 eliminates the weak interface transition zone between the connecting pipe 16 and the post-poured concrete, forming an integral bonding structure. This significantly improves the interface's shear, tensile, and slip resistance, greatly enhancing the sealing performance of the connection between the connecting pipe 16 and the reinforced concrete layer 10. Combined with the waterproof wing ring 18, it achieves double seepage prevention between the connecting pipe 16 and the reinforced concrete layer 10, preventing sewage from leaking from the joint between the two.

[0021] The supporting and flexible seepage-proof structures between the connecting pipe 16 and the circulation pipe 20 are the core seepage-proof components. First, the waterproof membrane layer 19 is tightly bonded to the inner wall of the connecting pipe 16 with polyurethane adhesive. In this embodiment, the waterproof membrane layer 19 is made of chlorinated polyethylene with a thickness of 3mm. This membrane has good toughness and is resistant to acids and alkalis, and can be adapted to the corrosive environment of sewage treatment. It is bonded to the inner wall of the connecting pipe 16 without voids or gaps, forming a basic seepage-proof layer.

[0022] A support frame is installed on the lower inner side of the waterproof membrane layer 19. The support frame is composed of multiple steel wires 25 with an outer diameter of 4mm. The steel wires 25 are evenly distributed along the length of the connecting pipe 16 to provide stable support for the circulation pipe 20. High-flow mortar 24 is laid at the support frame with a thickness of 10mm. In this embodiment, the high-flow mortar 24 is made by mixing 1000kg of silicate cement, 1700kg of medium and fine sand, 300kg of fly ash, 300kg of polycarboxylate-based high-efficiency water-reducing agent, and 1500kg of water by weight. The particle size range of the medium and fine sand is 0.16-0.63mm. This mortar has the characteristics of self-flowing, self-compacting, no shrinkage, and high strength. After being laid, it can fully fill the gaps around the support frame.

[0023] Before the high-flowability mortar 24 cures, the circulation pipe 20 is inserted into the connecting pipe 16. The high-flowability mortar 24 is squeezed by the weight of the circulation pipe 20, so that the mortar is tightly bonded to the outer wall of the circulation pipe 20. At the same time, the second waterproof membrane layer 23 is fixed to the outer wall of the circulation pipe 20 by hot-melt bonding. In this embodiment, the second waterproof membrane layer 23 is a 5mm thick TPO waterproof membrane. This membrane has a low melting point, can be hot-air welded, and has good flexibility. It can adapt to the slight vibration of the circulation pipe 20 caused by sludge transportation, avoid the membrane from cracking, and has no curling edges or gaps after hot-melt bonding with the outer wall of the circulation pipe 20.

[0024] After the circulation pipe 20 is laid, a gap to be filled is formed between the first waterproof membrane layer 19 and the second waterproof membrane layer 23. A waterproof filling layer 22 is set in this gap to form a complete flexible seepage-proof structure. In this embodiment, the waterproof filling layer 22 is made of PU850 high-hardness polyurethane rigid foam from Beijing Oriental Yuhong Waterproof Technology Co., Ltd. The foam is slowly injected from both ends of the gap to the middle. During the injection process, the air in the gap is fully expelled so that the foam fills the entire gap densely. After curing, a high-strength, seamless seepage-proof filling layer is formed. It works in synergy with the first waterproof membrane layer 19 and the second waterproof membrane layer 23 to achieve flexible seepage prevention between the circulation pipe 20 and the connecting pipe 16. It can effectively offset the vibration of the circulation pipe 20 and avoid the problem of poor sealing caused by vibration.

[0025] In this embodiment, the inner wall of the circulation pipe 20 is sprayed with a wear-resistant layer 21. The wear-resistant layer 21 is an alumina ceramic composite coating, which improves the wear resistance of the pipe and extends its service life. The anti-seepage layers of the sedimentation tank 6 and the redundant anti-seepage structures at the connecting pipe 16 and the circulation pipe 20 cooperate with each other to form a full-dimensional anti-seepage system. This solves the technical problem of poor sealing between the connecting pipe and the concrete layer and between the circulation pipe and the connecting pipe caused by the vibration of the circulation pipe in the existing coagulation sedimentation tank. It effectively avoids sewage leakage. Moreover, the circulation pipe is installed in the connecting pipe by a through-installation method. During later maintenance, the circulation pipe can be directly pulled out without damaging the tank structure, which greatly improves the convenience of maintenance.

[0026] In the wastewater treatment process, wastewater enters the coagulation reaction tank 1 through the inlet pipe 4, then enters the medium reaction tank 2 after the addition of coagulant, and then enters the flocculation reaction tank 3 after the addition of coagulant aid and sand. Finally, it enters the sedimentation tank 6 to complete sedimentation. The sludge at the bottom of the sedimentation tank 6 is discharged through the circulation pump 5 and the mud pump 8 in conjunction with the circulation pipe 20. Throughout the process, the redundant anti-seepage structure maintains stable anti-seepage performance. Even under long-term vibration and corrosion conditions, it can still ensure that there is no leakage at the connection between the tank body and the pipe, which greatly improves the service life and operational stability of the coagulation sedimentation tank.

[0027] A type of coagulation sedimentation tank, such as Figure 1-2 As shown, the system includes a coagulation reaction tank 1, a media reaction tank 2, a flocculation reaction tank 3, and a sedimentation tank 6 arranged sequentially. Each of the coagulation reaction tank 1, media reaction tank 2, flocculation reaction tank 3, and sedimentation tank 6 is equipped with a stirring structure 7 and a hanging frame 9 on the upper part for easy handling of the reagents. A connecting pipe 16 is laid at the bottom of the sedimentation tank 6, and a circulation pipe 20 is installed inside the connecting pipe 16. The circulation pipe 20 is made of welded steel pipe and connected to a mud pump 8. The sedimentation tank 6 is formed by casting a reinforced concrete layer 10, and the tank body is laid from bottom to top with a compacted subsoil layer 12, a waterproof cushion layer, a waterproof membrane layer 14, a waterproof protective layer, a waterproof concrete layer, and a waterproof surface layer. Friction piles 11 are arranged in the compacted subsoil layer 12 to achieve anti-settlement. The waterproof cushion layer is a mortar layer 13 made of waterproof mortar, and the waterproof protective layer is a reinforced mortar layer 15. The sedimentation tank 6 has an overall redundant anti-seepage structure.

[0028] The coagulation sedimentation tank provided in this embodiment has the following construction steps: The foundation pit is excavated and leveled, and friction piles 11 are driven in the predetermined area. After the pile construction is completed, the subgrade soil is compacted in layers to form a compacted subgrade soil layer 12. Waterproof mortar is poured on the compacted subsoil layer 12 to form mortar layer 13 with a thickness of 25mm. The surface is smoothed, polished and cured until the strength meets the standard. 3-4 layers of waterproof membrane are laid on mortar layer 13 to form waterproof membrane layer 14. The overlap width of the membrane is not less than 100mm, and the overlap is sealed by heat fusion. Reinforcing bars are tied to the waterproof membrane layer 14 and waterproof mortar is poured to form the second mortar layer 15, which serves as the bottom formwork for the reinforced concrete layer 10. After curing, the pre-embedded positioning lines for the connecting pipe 16 are marked. Prefabricate the connecting pipe 16 and waterproof wing ring 18 to ensure that the waterproof wing ring 18 is firmly welded to the outer wall of the pipe without gaps. Grind and remove rust, scum and oil stains from the outer wall of the connecting pipe 16. Mix the bonding layer 17 slurry according to the specified ratio, and apply it evenly to the outer wall of the connecting pipe 16 by high-pressure spraying and manual scraping, focusing on covering both ends of the pipe. The coating thickness is controlled to 2mm to ensure continuous coating without any omissions. The connecting pipe 16 coated with bonding layer 17 is hoisted to the pre-embedded positioning line, the horizontality and verticality of the pipe are adjusted, and it is fixed with temporary support; The steel reinforcement cage of the reinforced concrete layer 10 is tied to ensure that the distance between the steel reinforcement and the connecting pipe 16 meets the design requirements. Then the concrete is poured, vibrated to make it dense, and the vibrator is prevented from directly hitting the connecting pipe 16. After the pouring is completed, it is cured according to the specifications so that the connecting pipe 16 is pre-embedded and a fixed anti-seepage structure is formed. Once the reinforced concrete layer 10 reaches more than 80% of the design strength, the inner wall of the connecting pipe 16 is cleaned, ground, and dried. Polyurethane adhesive is applied, and the cut chlorinated polyethylene waterproof membrane is applied to form waterproof membrane layer 19. Roller is used to remove air between the membrane and the inner wall of the pipe to ensure that there are no voids or curling edges. The joints of the membrane are welded by hot melt. Inside the lower side of the waterproof membrane layer 19, steel wires 25 with an outer diameter of 4mm are laid along the length of the pipe to form a support skeleton. The steel wires are evenly spaced and fixed with waterproof adhesive dots. Mix the high-flowability mortar according to the ratio 24, and the mixing time is not less than 5 minutes to ensure that the mortar is uniform and free of lumps. Lay the mortar on the support frame with a thickness of 10mm. Use the self-flowing nature of the mortar to fill the gaps around the frame without additional vibration. Before the high-flowability mortar 24 sets, the outer wall of the circulation pipe 20 is ground. At the same time, TPO waterproof membrane is applied to the outer wall of the circulation pipe 20 by hot melting to form waterproof membrane layer 23. Then, the circulation pipe 20 is slowly inserted into the connecting pipe 16. The high-flowability mortar 24 is squeezed by the weight of the pipe to make the mortar adhere tightly to the outer wall of the circulation pipe 20. The center position of the circulation pipe 20 is adjusted and temporarily fixed. After the high-flowability mortar 24 has fully cured, check the gap between the waterproof membrane layer 19 and the waterproof membrane layer 23 to be filled. Confirm that there is no debris or water accumulation. Slowly inject PU850 high-hardness polyurethane rigid foam from both ends of the gap to the middle. Keep the injection pressure stable to ensure that the foam fully fills the gap and removes the internal air. Continue until the foam slightly overflows from the middle of the gap to complete the construction of the waterproof filling layer 22. At the end of the curing period of the foam, heat the circulation pipe to improve the foaming efficiency of the foam and soften the waterproof membrane layer 2 to improve the bonding effect with the waterproof filling layer. A wear-resistant layer 21 is sprayed on the inner wall of the circulation pipe 20, and then the tank structure of the sedimentation tank 6 is constructed on the reinforced concrete layer 10, and the construction of the waterproof concrete layer and the waterproof surface layer is completed in sequence. Connect the circulation pipe 20 to the mud pump 8 and the circulation pump 5 to ensure that the pipe interface is sealed firmly. At the same time, complete the overall assembly of the coagulation reaction tank 1, the medium reaction tank 2, and the flocculation reaction tank 3, as well as the pipeline connection between each tank. A full-water test was conducted on sedimentation tank 6 and each reaction tank for a duration of no less than 24 hours. All seepage prevention parts were checked for leaks and wet stains.

[0029] During the construction process, The raw materials such as E-51 epoxy resin and polyamide curing agent for bonding layer 17 need to be prepared and used immediately. The slurry after stirring should be coated within 30 minutes. When the ambient temperature is below 5℃, heat preservation and heating measures should be taken. For high-flowability mortar 24, the particle size of medium and fine sand must be strictly controlled between 0.16-0.63mm. The water-cement ratio must be precisely controlled during mixing to avoid reducing the strength of the mortar due to excessive water addition. Waterproofing materials such as waterproof membranes, polyurethane adhesives, and expanding foam must all meet national waterproofing standards and be used within their expiration dates. Before applying expanding foam, the pressure in the container must be checked to ensure normal dispensing. When the connecting pipe 16 is pre-embedded, the horizontal and vertical deviations shall not exceed 3‰, and the temporary support shall have sufficient load-bearing capacity to prevent the pipe from shifting during concrete pouring; When installing the circulation pipe 20, operate slowly to avoid scratching the waterproof membrane layer 19. After installation, the center position deviation should not exceed 5mm to ensure concentricity with the connecting pipe 16. All pipe joints must be reinforced with anti-seepage treatment, and welded joints must be inspected for flaws to ensure there are no welding defects. Before laying the waterproof membrane, the substrate must be dry, flat, and free of cracks. The polyurethane adhesive should be applied evenly without any omissions. The welding temperature at the overlap of the membrane should be controlled at 200-250℃ to ensure a strong weld. When injecting expanding foam, it must be done from both ends toward the middle. Do not inject from one side at a time to prevent air pockets from forming in the gaps. Do not touch or squeeze the circulation pipe before the expanding foam has cured. During the curing of concrete and mortar layers, the ambient temperature should be maintained between 5-35℃, and the curing time should be no less than 7 days. When watering for curing, avoid direct water rinsing of the anti-seepage coating.

[0030] The coagulation sedimentation tank provided in this embodiment achieves long-term stable seepage prevention between the connecting pipe and the reinforced concrete layer through a fixed seepage prevention structure. The flexible seepage prevention structure reduces the impact of the vibration of the circulating pipe on the connecting pipe. Furthermore, the flexible seepage prevention structure can effectively reduce the porosity during the vibration of the circulating pipe, ensuring a long-term seepage prevention effect.

[0031] During maintenance, the wear-resistant layer is maintained first. If the maintenance meets the usage standards, it can continue to be used. If both the wear-resistant layer and the circulation pipe are damaged, the flexible seepage-proof structure can be softened by heating the circulation pipe, allowing it to be pulled out for replacement. This facilitates maintenance. The entire structure from the waterproof membrane layer inwards is replaced, resulting in high construction efficiency. It is especially suitable for circulation pipes shorter than 10m and can meet the needs of most sizes of coagulation sedimentation tanks.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A redundant seepage-proof structure, characterized in that, The system includes a fixed seepage-proof structure installed between the connecting pipe and the reinforced concrete layer. The fixed seepage-proof structure includes a waterproof wing ring installed outside the connecting pipe and a bonding layer installed outside the connecting pipe. The bonding layer is distributed at least at both ends of the connecting pipe. The system also includes a supporting seepage-proof structure installed between the circulating pipe and the connecting pipe. The supporting seepage-proof structure includes a supporting skeleton distributed at least inside the lower side of the connecting pipe. A flexible seepage-proof structure is also installed between the circulating pipe and the connecting pipe. The flexible seepage-proof structure includes a waterproof membrane layer one installed on the inner wall of the connecting pipe and a waterproof membrane layer two installed on the outer wall of the circulating pipe. A waterproof filler layer is provided between the waterproof membrane layer one and the waterproof membrane layer two.

2. The redundant seepage-proof structure according to claim 1, characterized in that, The bonding layer has a thickness of 2-3 mm and is made of the following raw materials in parts by weight: 100-120 parts of E-51 epoxy resin, 30-40 parts of polyamide curing agent, 80-120 parts of quartz powder, and 1.5-3 parts of silane coupling agent. During construction, after the bonding layer is coated on the outside of the connecting pipe, it is placed at the predetermined position, and then concrete is poured to obtain a reinforced concrete layer, and the connecting pipe is pre-embedded.

3. The redundant seepage-proof structure according to claim 1, characterized in that, The first waterproof membrane layer is made of chlorinated polyethylene waterproof membrane with a thickness of 3-4 mm. The first waterproof membrane layer is bonded to the inner wall of the connecting pipe with polyurethane adhesive.

4. The redundant seepage-proof structure according to claim 3, characterized in that, The second waterproof membrane layer is made of TPO waterproof membrane with a thickness of 5-8mm, and the second waterproof membrane layer is bonded to the circulation pipe by hot melt bonding.

5. The redundant seepage-proof structure according to claim 4, characterized in that, The supporting frame includes multiple steel wires with an outer diameter of 4mm, which are set on the first waterproof membrane layer. The steel wires are distributed along the length of the connecting pipe. High-flow mortar is laid at the supporting frame. The high-flow mortar is made of the following raw materials in parts by weight: 10 parts silicate cement, 17 parts medium and fine sand, 3 parts fly ash, 3 parts polycarboxylate-based high-efficiency water-reducing agent, and 15 parts water. The particle size of the medium and fine sand is 0.16-0.63mm. The laying thickness is 10mm. After laying, the high-flow mortar flows by itself. Before the high-flow mortar cures, a circulation pipe is installed in the connecting pipe. The circulation pipe squeezes the high-flow mortar. After the circulation pipe is laid, a gap to be filled is formed between the first waterproof membrane layer and the second waterproof membrane layer. A waterproof filling layer is set in the gap to be filled.

6. The redundant seepage-proof structure according to claim 5, characterized in that, The waterproof filling layer is made of high-hardness rigid polyurethane foam, which is injected from both ends of the gap to be filled toward the middle.

7. A coagulation sedimentation tank, comprising a coagulation reaction tank, a media reaction tank, a flocculation reaction tank, and a sedimentation tank, wherein a connecting pipe is laid at the bottom of the sedimentation tank, and a circulation pipe is installed within the connecting pipe, characterized in that, The sedimentation tank is provided with a redundant anti-seepage structure as described in any one of claims 1-5.

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