Composite waterproof structure for high-pressure-bearing water environment and construction method of composite waterproof structure

Abstract

The invention relates to the technical field of building waterproofing, and discloses a composite waterproof structure for a high-pressure-bearing water environment and a construction method thereof.The composite waterproof structure comprises a concrete base body, the concrete base body comprises a bearing platform and a raft, the bearing platform is located on the upper surface of the raft, and the side wall of the bearing platform is exposed; the gradient pressure-resistant waterproof layer covers the side wall of the bearing platform and the exposed surface of the plane of the raft plate, sequentially comprises an interface enhancement layer and a permeable epoxy resin layer from inside to outside, and deeply permeates into the surface of the concrete matrix by 0.5-1 mm; the dynamic response layer and the polyurethane-rubber composite elastomer layer are tightly attached to the outer surface of the interface enhancement layer. The gradient pressure-resistant waterproof layer composed of the interface enhancement layer, the dynamic response layer and the rigid protection layer is arranged and combined with the bearing platform and the raft in the concrete base body, the rigid protection layer enhances abrasion resistance, and therefore the high-pressure-bearing and high-abrasion-resistance composite waterproof structure is achieved, and the stability and durability of the waterproof structure in the high-pressure-bearing water environment are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building waterproofing, and in particular to a composite waterproofing structure for use in a high-pressure water environment and a construction method thereof. Background Art

[0002] When constructing underground sites in the Yangtze River Delta region, there are many challenges such as groundwater, underground humidity, and the contact between underground structures and the surrounding environment.

[0003] At present, underground sites are mainly waterproofed by combining raft slabs with waterproof membranes. During the construction process, the side walls of the base plate and the sides of the raft slab are often in friction with the upper body of the foundation and the upper body of the backfill, and are in contact with the pressurized water in the foundation, causing the waterproof layer on the base plate and the raft slab to be easily damaged and cause leakage, thereby affecting the anti-leakage performance of the large-surface waterproof layer of the entire base plate, and even causing large-scale water seepage in the underground site, posing a high safety hazard. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a composite waterproof structure for high-pressure water environment and its construction method, which solves the problem that the waterproof layer is easily damaged and causes leakage, posing a high safety hazard.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A composite waterproof structure for high-pressure water environment, comprising: The concrete base comprises a cap and a raft, wherein the cap is located on the upper surface of the raft with its side walls exposed; The gradient compressive waterproof layer covers the exposed surface of the pedestal sidewall and raft plane, and includes the following from the inside to the outside: Interface reinforcement layer, penetrating epoxy resin layer, penetrates into the concrete matrix surface to a depth of 0.5~1mm; The dynamic response layer is a polyurethane-rubber composite elastomer layer, which is tightly attached to the outer surface of the interface reinforcement layer; The rigid protective layer, a glass fiber reinforced polymer waterproof membrane, is bonded to the outside of the dynamic response layer through a synergistically strengthened interface; The sealing mechanism is provided in the connection gap between adjacent concrete substrates and comprises: The water channel has a V-shaped groove structure and is opened at the center line of the connection gap with the groove facing upwards; Expansion seal, polyurethane elastomer that expands when exposed to water, fills the inside of the water channel; Synergistically strengthen the interface, the thermoplastic polyolefin adhesive film is melt-embedded in the contact interface between the dynamic response layer and the rigid protective layer.

[0006] By adopting the above technical solution, the exposed side wall of the pedestal provides an additional construction surface for the gradient pressure-resistant waterproof layer, enhancing the overall waterproof coverage and ensuring the stability of the foundation structure in a high-pressure water environment.

[0007] Preferably, the inclination angle of the two side walls of the V-shaped groove of the water guide channel is 50°±5°, the groove depth is 25±5mm, and a permeable non-woven fabric is laid on the bottom of the groove. The permeable non-woven fabric extends 20mm outside the groove and is pressed against the surface of the concrete base.

[0008] By adopting the above technical solution, the inclination angles of the two side walls of the V-shaped groove and the groove depth are conducive to the smooth flow of water in the groove, while providing a suitable filling space for the expansion seal. The permeable non-woven fabric laid at the bottom of the groove can not only filter impurities in the water to prevent blockage of the water guide channel, but also can be pressed onto the surface of the concrete base by extension, thereby enhancing the fit with the base, assisting in water conduction and improving the sealing effect.

[0009] Preferably, the expansion seal has a trapezoidal cross-section, the upper bottom width is 5 mm smaller than the V-groove opening, and the lower bottom width is the same width as the straight section of the groove bottom. A pressure relief microtube is embedded inside it, one end of the pressure relief microtube passes through the top of the expansion seal, and the other end extends obliquely to the external drainage ditch.

[0010] By adopting the above technical solution, the trapezoidal cross-section design enables the expansion seal to be easily placed in the V-groove and to better fit the groove wall when expanding, thereby achieving effective sealing. The internally embedded pressure relief microtube can discharge water to the external drainage ditch when the pressure in the seal is too high, thereby avoiding damage to the seal due to excessive pressure and ensuring the long-term stability of the sealing performance.

[0011] Preferably, the outer surface of the rigid protective layer is provided with an array of anti-wear convex points, which are truncated cones with a bottom diameter of 1.5 mm, a top diameter of 0.8 mm, and a height of 0.8±0.2 mm. They are arranged in a rectangular array with a center spacing of 12±2 mm.

[0012] By adopting the above technical solution, the anti-wear convex dot array increases the friction and wear resistance of the outer surface of the rigid protective layer, which can effectively resist the friction and scratching of external objects, reduce the damage to the waterproof membrane caused by long-term friction, further improve the protective ability of the rigid protective layer, and extend the service life of the entire waterproof structure.

[0013] Preferably, the melt penetration depth of the synergistic strengthening interface is 40%±10% of the thickness of the dynamic response layer, forming a serrated bite structure.

[0014] By adopting the above technical solution, the melt penetration depth and serrated bite structure greatly enhance the connection strength between the dynamic response layer and the rigid protective layer, making the combination between the two layers tighter and less likely to separate, thereby improving the stability and reliability of the entire waterproof structure in high-pressure water environments.

[0015] A composite waterproof construction method for a high-pressure water environment, comprising the following steps: S1. Use high-pressure water jet to impact the surface of the concrete matrix to form a micropore array with a depth of 0.5~1mm to obtain an activated surface; S2, spraying epoxy resin slurry onto the activated surface, and the slurry penetrates into the micropores and solidifies to form an interface reinforcement layer; S3. When the interface reinforcement layer is not completely cured, apply polyurethane-rubber composite slurry in batches, controlling the single thickness to be ≤0.5mm and the cumulative thickness to be 0.8~1.5mm; S4. Cut a V-shaped groove with an inclination of 50°±5° at the concrete joint gap. Lay a water-permeable non-woven fabric at the bottom of the V-shaped groove, and press the edge 20mm away from the concrete. Fill the groove with water-swelling elastomer in layers to form a trapezoidal cross-section seal. S5. Cover the surface of the dynamic response layer with a thermoplastic polyolefin adhesive film; infrared heat the film to 170±10°C to melt the film; immediately roll and lay a rigid protective layer at a pressure of 0.4-0.6 MPa; S6. After the rigid protective layer is cooled to below 60°C, the surface is pressed with an embossing roller at 90±10°C to form an array of truncated cone convex dots with a height of 0.8±0.2mm.

[0016] By adopting the above technical solution, high-pressure water jet activation surface enhances the penetration and anchoring force of epoxy resin, the micropore depth matches the interface layer requirements, temperature and humidity control ensures that the epoxy resin is completely cured to avoid bubbles or strength loss, V-grooves of specific angles are cut at the concrete connection gaps, and after laying permeable non-woven fabrics, water-swelling elastomers are layered and filled to effectively seal the gaps. The dynamic response layer is covered with a thermoplastic polyolefin adhesive film, and after being melted by infrared heating, a rigid protective layer is rolled and laid to form a strong synergistically reinforced interface. After the rigid protective layer cools, an array of wear-resistant bumps is pressed out to enhance its wear resistance and meet the waterproofing requirements in high-pressure water environments.

[0017] Preferably, in step S4, the layered pressure filling includes the following steps: First, fill the bottom layer with high expansion rate material, expansion rate ≥ 250%, density ≥ 95%; Then fill the surface with low expansion material, with an expansion rate of ≤150%, covering the bottom layer and protruding 2~3mm from the groove.

[0018] By adopting the above technical solution, the bottom layer of high-expansion rate material provides a strong initial expansion force, filling the gap and forming a basic seal. The high density ensures its stability. The surface layer of low-expansion rate material ensures the seal while avoiding damage to the surrounding structure due to excessive expansion. The protruding notch part can further enhance the sealing effect and ensure the waterproof performance of the connection gap.

[0019] Preferably, in step S5, during roller laying, the melting penetration depth of the adhesive film reaches 40%±10% of the thickness of the dynamic response layer, forming a serrated bite interface.

[0020] By adopting the above-mentioned technical solution, the melt penetration depth of the adhesive film is controlled and a serrated interlocking interface is formed, which enables high-strength bonding between the dynamic response layer and the rigid protective layer. The two are interlocked like "meshing gears", greatly enhancing the connection stability between the two layers and improving the reliability of the entire waterproof structure in complex environments.

[0021] Preferably, in step S3, the composite slurry includes the following raw materials in parts by weight: 100 parts of polyurethane prepolymer, synthesized by the reaction of diphenylmethane diisocyanate and polyether polyol, with an isocyanate content of 7.5±1.0wt%; 30 parts of styrene-butadiene rubber latex, solid content 45±5%, pH 9.0±0.5, glass transition temperature -40°C; 6.5±1.5 parts of nano-silica, hydrophilic fumed silica, particle size 15±5nm, specific surface area 200±50m² / g; The polyurethane prepolymer and styrene-butadiene rubber latex were mechanically stirred at 500-800 r / min for 12 min, nano-silica was added, and the mixture was switched to high-speed dispersion at 1200-1500 r / min for 25 min to obtain a composite slurry.

[0022] By adopting the above technical solution, polyurethane prepolymer provides basic curing performance and strength, styrene-butadiene rubber latex gives the slurry elasticity and flexibility, nano-silica enhances the strength and stability of the slurry, and reasonable stirring and dispersion process ensures uniform mixing of all components, so that the final composite slurry can form a dynamic response layer with excellent performance.

[0023] Preferably, in step S2, during the curing process of the epoxy resin slurry, the ambient temperature is controlled at 20° C.-30° C. and the relative humidity is controlled at 40%-60% to ensure that the curing effect and penetration depth of the interface reinforcement layer meet the requirements.

[0024] By adopting the above technical solution, the slurry can fully penetrate the micropores and solidify evenly, ensuring the solidification effect of the interface reinforcement layer, making it tightly bonded to the concrete matrix, while achieving the ideal penetration depth, thereby providing reliable basic bonding for the entire waterproof structure.

[0025] The present invention provides a composite waterproof structure for use in a high-pressure water environment and a construction method thereof. It has the following beneficial effects: 1. In the present invention, a gradient compressive waterproof layer consisting of an interface reinforcement layer, a dynamic response layer and a rigid protective layer is provided, and combined with the base and raft slab in the concrete matrix to achieve complementary advantages of each layer of materials. The interface reinforcement layer penetrates deep into the concrete matrix to enhance adhesion, the dynamic response layer provides elastic adaptation to deformation, and the rigid protective layer enhances wear resistance, thereby realizing a high-pressure-bearing and high-wear-resistant composite waterproof structure, effectively improving the stability and durability of the waterproof structure in a high-pressure water environment.

[0026] 2. In the present invention, by setting up a sealing mechanism in the connection gap between adjacent concrete substrates, including a water-guiding channel with a specific structure, an expansion sealing body and a synergistic reinforcement interface, effective sealing and drainage of the connection gap are achieved. The water-guiding channel guides the water flow, the expansion sealing body expands when it comes into contact with water to fill the gap, and the synergistic reinforcement interface enhances the interlayer adhesion, thereby achieving high sealing performance, preventing water from penetrating from the connection gap, and ensuring the overall waterproof effect of the composite waterproof structure.

[0027] 3. In the present invention, by using a polyurethane-rubber composite slurry and a glass fiber reinforced polymer waterproof membrane in combination with each other, the material performance is synergistically improved. The polyurethane-rubber composite slurry has good elasticity and sealing properties, and the waterproof membrane provides high strength and water resistance. The combination of the two enhances the pressure-bearing performance and wear resistance of the waterproof material, thereby achieving a long-term and stable waterproof function of the composite waterproof structure in a high-pressure water environment and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a diagram of a composite waterproof structure for a high-pressure water environment according to the present invention; Figure 2 The present invention is a schematic diagram of a method flow of a composite waterproof construction method for a high-pressure water environment. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] Please see the attached Figure 1 The embodiment of the present invention provides a composite waterproof structure for use in a high-pressure water environment, comprising: The concrete base comprises a cap and a raft, wherein the cap is located on the upper surface of the raft with its side walls exposed; The gradient compressive waterproof layer covers the exposed surface of the pedestal sidewall and raft plane, and includes the following from the inside to the outside: Interface reinforcement layer, penetrating epoxy resin layer, penetrates into the concrete matrix surface to a depth of 0.5~1mm; The dynamic response layer is a polyurethane-rubber composite elastomer layer, which is tightly attached to the outer surface of the interface reinforcement layer; The rigid protective layer, a glass fiber reinforced polymer waterproof membrane, is bonded to the outside of the dynamic response layer through a synergistically strengthened interface; The sealing mechanism is provided in the connection gap between adjacent concrete substrates and comprises: The water channel has a V-shaped groove structure and is opened at the center line of the connection gap with the groove facing upwards; Expansion seal, polyurethane elastomer that expands when exposed to water, fills the inside of the water channel; Synergistically strengthen the interface, the thermoplastic polyolefin adhesive film is melt-embedded in the contact interface between the dynamic response layer and the rigid protective layer.

[0031] The concrete base, as the foundation support of the entire waterproof structure, mainly bears the load from the superstructure and transfers it to the raft. The raft has a large area, which can more evenly distribute the pressure transferred from the cap to the foundation. The cap is located on the upper surface of the raft with the side walls exposed. This structural form provides a specific construction surface for subsequent waterproofing treatment. The epoxy resin in the gradient pressure-resistant waterproof layer must be a low-viscosity, high-permeability formula. It penetrates and seals the capillary pores of the concrete surface, forming a strong anchoring force, significantly improving the physical bond strength between the subsequent coating and the concrete substrate, and preventing "back-to-water" peeling caused by water pressure. This composite layer combines the high elasticity and fatigue resistance of polyurethane with the flexibility and water resistance of rubber. Its main function is to absorb minor deformations (expansion and cracking) of the concrete substrate caused by temperature changes, loads, or slight settlement. Its excellent elongation and elastic recovery can effectively adapt to dynamic displacement without breaking. The glass fiber reinforcement layer provides high tensile strength, puncture resistance, and impact resistance, protecting the internal flexible layer from mechanical damage during backfill, construction, or operation. The polymer membrane itself has excellent water resistance, chemical corrosion resistance, and long-term stability, making it the ultimate barrier against high water pressure and harsh environments. The inclination angle of the two side walls of the V-shaped groove of the water guide channel is 50°±5°, the groove depth is 25±5mm, and the bottom of the groove is paved with permeable non-woven fabric, which extends 20mm outside the groove and is pressed against the surface of the concrete base.

[0032] The V-shaped groove design is conducive to concentrating leaking water and guiding it to the bottom of the groove. The inclination balances the water conduction efficiency and structural stability, preventing the groove wall from collapsing. The role of the permeable non-woven fabric is to act as a filter layer to prevent the subsequent filling of sealing particles from clogging the water conduction path. Its 20mm extension ensures continuous overlap with the concrete, guiding the flow of water that may penetrate into the gap, facilitating centralized treatment, and preventing water from seeping from the edge.

[0033] The expansion seal has a trapezoidal cross-section. The width of the upper base is 5mm smaller than the opening of the V-groove, and the width of the lower base is the same as the straight section of the groove bottom. A pressure relief microtube is embedded inside it. One end of the pressure relief microtube passes through the top of the expansion seal, and the other end extends obliquely to the external drainage ditch.

[0034] The trapezoidal cross-section design ensures that the sealing body is tightly embedded in the V-shaped groove. The gap reserved at the upper bottom is reserved for expansion. The pressure relief microtube is made of PE or PP material with an inner diameter of 2 to 4 mm. When the sealing body expands with water and produces excessive internal pressure, the microtube can serve as a pressure relief channel to prevent the sealing body from losing elasticity or damaging the structure due to excessive expansion. At the same time, during initial water seepage or low water pressure, the microtube can drain a small amount of seepage water to the external ditch, realizing "blocking and drainage combination". The oblique extension is conducive to drainage and is not easy to clog.

[0035] An array of anti-wear bumps is provided on the outer surface of the rigid protective layer. The bumps are truncated cones with a bottom diameter of 1.5 mm, a top diameter of 0.8 mm, and a height of 0.8 ± 0.2 mm. They are arranged in a rectangular array with a center spacing of 12 ± 2 mm.

[0036] The main function of the convex dot array is to increase the surface friction coefficient and prevent the subsequent backfill soil from slipping along the smooth waterproof layer surface under saturation. The truncated cone shape takes into account both wear resistance and reduced stress concentration, optimizes the balance between anti-slip effect and material consumption, and ensures the feasibility of the embossing process.

[0037] The melt penetration depth of the synergistic strengthening interface is 40%±10% of the thickness of the dynamic response layer, forming a serrated bite structure.

[0038] This interface uses hot-melt bonding technology rather than physical overlap or ordinary adhesive bonding. The adhesive film is made of modified TPO or EVA material, which melts at a temperature of 170±10°C, and partially penetrates into the surface microstructure of the dynamic response layer below, forming a "sawtooth" mechanical interlocking bite after cooling and solidification. It has higher shear strength, peel strength and long-term stability than simple surface bonding, and is especially able to resist interlayer separation under water pressure.

[0039] Please see the attached Figure 2 A composite waterproof construction method for a high-pressure water environment comprises the following steps: S1. Use high-pressure water jet to impact the surface of the concrete matrix to form a micropore array with a depth of 0.5~1mm to obtain an activated surface; High-pressure water jets, with pressures ranging from 1500-2500 bar, can effectively remove laitance, weak layers, and contaminants from the concrete surface, while simultaneously opening capillary pores to form a rough "activated surface." The resulting micropore array depth of 0.5-1mm is key to ensuring effective penetration and anchoring of subsequent epoxy resins. These micropores increase the surface roughness of the concrete, creating an activated surface that facilitates the adhesion of subsequent materials. S2, spraying epoxy resin slurry onto the activated surface, and the slurry penetrates into the micropores and solidifies to form an interface reinforcement layer; During the curing process of epoxy resin slurry, the ambient temperature is controlled at 20℃-30℃ and the relative humidity is controlled at 40%-60% to ensure that the curing effect and penetration depth of the interface reinforcement layer meet the requirements; Use spraying equipment to evenly spray the epoxy resin slurry onto the activated surface. Ensure uniform coverage and facilitate penetration of the coating. Strictly control the temperature and humidity at 20-30°C and 40%-60% RH to ensure a firm bond with the concrete matrix. S3. When the interface reinforcement layer is not completely cured, apply polyurethane-rubber composite slurry in batches, controlling the single thickness to be ≤0.5mm and the cumulative thickness to be 0.8~1.5mm; The composite slurry includes the following raw materials in parts by weight: 100 parts of polyurethane prepolymer, synthesized by the reaction of diphenylmethane diisocyanate and polyether polyol, with an isocyanate content of 7.5±1.0wt%; 30 parts of styrene-butadiene rubber latex, solid content 45±5%, pH 9.0±0.5, glass transition temperature -40°C; 6.5±1.5 parts of nano-silica, hydrophilic fumed silica, particle size 15±5nm, specific surface area 200±50m² / g; The polyurethane prepolymer and styrene-butadiene rubber latex were mechanically stirred at 500-800 r / min for 12 min, nano-silica was added, and the mixture was dispersed at a high speed of 1200-1500 r / min for 25 min to obtain a composite slurry. When the interface reinforcement layer is in an uncured viscous state, scraping is performed to ensure chemical bonding or molecular chain entanglement between the two layers to achieve optimal interlayer adhesion. Thin layers of ≤0.5mm / layer are applied in batches to prevent bubbles, pinholes, or shrinkage cracks caused by difficulty in evaporating the internal solvent / water due to one-time thick coating. The cumulative thickness is 0.8~1.5mm, determined according to the water pressure level and deformation requirements. The polyurethane prepolymer provides reactive sites, the styrene-butadiene rubber emulsion improves flexibility and water resistance, and nano-silica acts as a reinforcing filler and thixotropic agent to improve the slurry's anti-sagging and mechanical properties. High-speed dispersion allows the nanoparticles to fully aggregate and evenly disperse. S4. Cut a V-shaped groove with an inclination of 50°±5° at the concrete joint gap. Lay a water-permeable non-woven fabric at the bottom of the V-shaped groove, and press the edge 20mm away from the concrete. Fill the groove with water-swelling elastomer in layers to form a trapezoidal cross-section seal. Layered filling includes the following steps: First, fill the bottom layer with high expansion rate material, expansion rate ≥ 250%, density ≥ 95%; Then fill the surface with low expansion material, with an expansion rate of ≤150%, covering the bottom layer and protruding 2~3mm from the groove.

[0040] V-groove cutting must ensure dimensional accuracy and groove wall integrity. The bottom layer of layered pressure filling is made of material with a high expansion rate ≥250%, which generates strong expansion force when exposed to water and quickly seals possible leakage channels. The surface layer is made of material with a low expansion rate ≤150%, providing a more flexible and durable sealing surface and reducing the risk of degradation or extrusion of high-expansion materials during repeated dry-wet cycles. The surface layer protrudes 2-3mm from the groove to ensure close contact with the subsequent covering layer. The pressure filling must be dense with a bottom layer density of ≥95% to prevent cavities. The layered operation ensures dense filling, ultimately forming a trapezoidal cross-section seal. S5. Cover the surface of the dynamic response layer with a thermoplastic polyolefin adhesive film; heat the film to 170±10°C by infrared heating to melt the adhesive film; immediately roll and lay the rigid protective layer at a pressure of 0.4-0.6 MPa; During roller laying, the melting penetration depth of the adhesive film reaches 40%±10% of the thickness of the dynamic response layer, forming a serrated bite interface; Infrared heating provides uniform and controllable heat, allowing the adhesive film to quickly melt to a suitable viscosity. Roller pressure and "immediate" operation ensure that the molten adhesive film is optimally bonded to the rigid protective layer and partially penetrates into the surface structure of the underlying dynamic response layer under pressure. S6. After the rigid protective layer is cooled to below 60°C, the surface is pressed with an embossing roller at 90±10°C to form an array of truncated cone convex dots with a height of 0.8±0.2mm.

[0041] Cooling to below 60°C ensures that the rigid protective layer and the underlying structure have been basically shaped, avoiding irreversible deformation or interlayer displacement caused by embossing at high temperatures. A heated embossing roller is used to soften the surface layer of the polymer coil, making it easier to plastically deform under pressure to form the designed convex shape and precise size, a conical convex array, to enhance the surface wear resistance while maintaining the overall strength of the substrate.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A composite waterproof structure for high pressure water environment, characterized in that: include: The concrete base comprises a cap and a raft, wherein the cap is located on the upper surface of the raft with its side walls exposed; The gradient compressive waterproof layer covers the exposed surface of the pedestal sidewall and raft plane, and includes the following from the inside to the outside: Interface reinforcement layer, penetrating epoxy resin layer, penetrates into the concrete matrix surface to a depth of 0.5~1mm; The dynamic response layer is a polyurethane-rubber composite elastomer layer, which is tightly attached to the outer surface of the interface reinforcement layer; The rigid protective layer, a glass fiber reinforced polymer waterproof membrane, is bonded to the outside of the dynamic response layer through a synergistically strengthened interface; The sealing mechanism is provided in the connection gap between adjacent concrete substrates and comprises: The water channel has a V-shaped groove structure and is opened at the center line of the connection gap with the groove facing upwards; Expansion seal, polyurethane elastomer that expands when exposed to water, fills the inside of the water channel; Synergistically strengthen the interface, the thermoplastic polyolefin adhesive film is melt-embedded in the contact interface between the dynamic response layer and the rigid protective layer.

2. A composite waterproof structure for use in a high-pressure water environment according to claim 1, characterized in that: The inclination angle of the two side walls of the V-shaped groove of the water guide channel is 50°±5°, the groove depth is 25±5mm, and the bottom of the groove is paved with permeable non-woven fabric, which extends 20mm outside the groove and is pressed against the surface of the concrete base.

3. The composite waterproof structure for high-pressure water environment according to claim 1, characterized in that: The expansion seal has a trapezoidal cross-section, with the upper bottom width being 5mm smaller than the V-groove opening and the lower bottom width being the same width as the straight section of the groove bottom. A pressure relief microtube is embedded inside the microtube, one end of which passes through the top of the expansion seal and the other end extends obliquely to the external drainage ditch.

4. The composite waterproof structure for use in a high-pressure water environment according to claim 1, characterized in that: The outer surface of the rigid protective layer is provided with an array of anti-wear bumps, which are truncated cones with a bottom diameter of 1.5 mm, a top diameter of 0.8 mm, and a height of 0.8±0.2 mm. They are arranged in a rectangular array with a center spacing of 12±2 mm.

5. The composite waterproof structure for high-pressure water environment according to claim 1, characterized in that: The melt penetration depth of the synergistic strengthening interface is 40%±10% of the thickness of the dynamic response layer, forming a serrated bite structure.

6. A composite waterproof construction method for high pressure water environment, characterized in that: A composite waterproof structure for a high-pressure water environment according to any one of claims 1 to 5, the method comprising the following steps: S1. Use high-pressure water jet to impact the surface of the concrete matrix to form a micropore array with a depth of 0.5~1mm to obtain an activated surface; S2, spraying epoxy resin slurry onto the activated surface, and the slurry penetrates into the micropores and solidifies to form an interface reinforcement layer; S3. When the interface reinforcement layer is not completely cured, apply polyurethane-rubber composite slurry in batches, controlling the single thickness to be ≤0.5mm and the cumulative thickness to be 0.8~1.5mm; S4. Cut a V-shaped groove with an inclination of 50°±5° at the concrete joint gap. Lay a water-permeable non-woven fabric at the bottom of the V-shaped groove, and press the edge 20mm away from the concrete. Fill the groove with water-swelling elastomer in layers to form a trapezoidal cross-section seal. S5. Cover the surface of the dynamic response layer with a thermoplastic polyolefin adhesive film; infrared heat the film to 170±10°C to melt the film; immediately roll and lay a rigid protective layer at a pressure of 0.4-0.6 MPa; S6. After the rigid protective layer is cooled to below 60°C, the surface is pressed with an embossing roller at 90±10°C to form an array of truncated cone convex dots with a height of 0.8±0.2mm.

7. A composite waterproof construction method for a high-pressure water environment according to claim 6, characterized in that: In step S4, the layered filling includes the following steps: First, fill the bottom layer with high expansion rate material, expansion rate ≥ 250%, density ≥ 95%; Then fill the surface with low expansion material, with an expansion rate of ≤150%, covering the bottom layer and protruding 2~3mm from the groove.

8. The composite waterproof construction method for a high-pressure water environment according to claim 6, characterized in that: In the step S5, during roller laying, the melting penetration depth of the adhesive film reaches 40%±10% of the thickness of the dynamic response layer, forming a serrated bite interface.

9. The composite waterproof construction method for a high-pressure water environment according to claim 6, characterized in that: In step S3, the composite slurry includes the following raw materials in parts by weight: 100 parts of polyurethane prepolymer, synthesized by the reaction of diphenylmethane diisocyanate and polyether polyol, with an isocyanate content of 7.5±1.0wt%; 30 parts of styrene-butadiene rubber latex, solid content 45±5%, pH 9.0±0.5, glass transition temperature -40°C; 6.5±1.5 parts of nano-silica, hydrophilic fumed silica, particle size 15±5nm, specific surface area 200±50m² / g; The polyurethane prepolymer and styrene-butadiene rubber latex were mechanically stirred at 500-800 r / min for 12 min, nano-silica was added, and the mixture was switched to high-speed dispersion at 1200-1500 r / min for 25 min to obtain a composite slurry.

10. The composite waterproof construction method for a high-pressure water environment according to claim 6, characterized in that: In step S2, during the curing process of the epoxy resin slurry, the ambient temperature is controlled at 20° C.-30° C. and the relative humidity is controlled at 40%-60% to ensure that the curing effect and penetration depth of the interface reinforcement layer meet the requirements.

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