Waterproof layer structure at joint of adjacent concrete structures and construction method

Abstract

The invention relates to the technical field of waterproofing of constructional engineering, in particular to a waterproof layer structure at the joint of adjacent concrete structures and a construction method. Comprising an inner waterproof structure arranged in a construction joint formed by two groups of concrete structures, and an upper waterproof structure arranged on surface layers of the two groups of concrete structures; the inner waterproof structure comprises two groups of interface fusion layers I, two groups of functional layers I arranged between the two groups of interface fusion layers I, and a waterproof core layer I arranged between the two groups of functional layers I; the upper waterproof structure comprises a second interface fusion layer, a second functional layer arranged on the second interface fusion layer, a second waterproof core layer arranged on the second functional layer and an outer protective layer arranged on the second waterproof core layer. According to the invention, deep fusion and permanent full adhesion with a concrete structure can be realized, a multi-layer waterproof system is constructed, the reliability and maintainability of a project are improved, the crack resistance and waterproof performance are excellent, and the risk of water channeling is completely eradicated.

Description

Technical Field

[0001] This invention relates to the field of waterproofing technology in building engineering, and more specifically, to a waterproofing layer structure and construction method at the junction of adjacent concrete structures. Background Technology

[0002] Concrete structures are widely used in construction, tunnels, underground engineering, and water conservancy facilities due to their excellent compressive strength and durability. However, concrete itself is a porous and brittle material, making it highly susceptible to cracking under the influence of hardening shrinkage, temperature changes, and foundation settlement. These cracks, especially construction joints, joints, and irregular base surfaces, become major channels for water seepage, seriously threatening the long-term safety and service life of the structure. Therefore, an effective waterproofing system is an indispensable and crucial component of concrete structure engineering.

[0003] Traditional concrete waterproofing primarily relies on the self-waterproofing of the concrete structure and additional waterproofing layers. Self-waterproofing places extremely high demands on the concrete mix design, pouring, and curing, making it difficult to completely guarantee against cracking in practical engineering. Therefore, adding a flexible waterproofing layer has become the mainstream protection measure. Currently commonly used flexible waterproofing layers include roll materials (such as SBS modified bitumen roll materials and polymer roll materials) and coatings (such as polyurethane coatings and polymer cement-based coatings).

[0004] However, these traditional waterproofing technologies have many limitations in application: 1. Adhesion reliability issues: Traditional waterproofing membranes are typically laid loosely or spot-bonded to concrete substrates, resulting in a "water-trapping layer." Once the waterproofing layer is damaged at a point, water will flow between the waterproofing layer and the structural layer, making it difficult to locate the leak and extremely difficult to repair. Although coatings can achieve full adhesion, if the concrete substrate is not properly prepared or the coating's adhesion is insufficient, blistering and peeling are still likely to occur.

[0005] 2. Insufficient adaptability to deformation: Dynamic cracks in concrete structures pose a major challenge to waterproofing. Traditional roll materials have many seams, which are prone to failure under structural deformation; while some coatings with insufficient rigidity or flexibility cannot effectively follow the expansion of cracks, leading to the tearing of the waterproofing layer.

[0006] 3. Construction compatibility and efficiency issues: When applying coatings to complex surfaces such as facades and ceilings, traditional paints are prone to dripping and cannot achieve the designed thickness in one coat, requiring multiple coats, which is inefficient. At irregular joints (such as inside and outside corners, pipe roots), roll materials require precise cutting and sealing, making construction quality highly dependent on worker skills, and ensuring full adhesion to the substrate is difficult.

[0007] 4. Poor system synergy: Existing waterproofing layers often adhere to the concrete surface as an independent "barrier," lacking deep chemical and physical integration with the concrete structure. When the concrete cracks, stress is directly transferred to the waterproofing layer, easily leading to its failure due to stress concentration. The waterproofing layer, stress buffer layer, and self-healing function are usually considered separately, failing to form an organically synergistic whole system.

[0008] Furthermore, existing technologies also face challenges in waterproofing joints of precast concrete structures. Joints are high-risk areas for leakage, requiring waterproofing materials that not only seal gaps but also accommodate minor displacements between components and form a strong bond with the concrete on both sides. This places higher demands on the adhesion and flexibility of the waterproofing materials. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a waterproof layer structure and construction method at the junction of adjacent concrete structures, which is deeply integrated with the concrete structure and permanently fully bonded, constructs a multi-layer waterproof system, introduces a self-healing and leakage indication mechanism, improves the reliability and maintainability of the project, has excellent crack resistance and waterproof performance, and completely eliminates the risk of water seepage. The solution adopted by this invention to solve the technical problem is: on the one hand: A waterproof layer structure at the junction of adjacent concrete structures includes an inner waterproof structure disposed within the construction joint formed by the two sets of concrete structures, and an upper waterproof structure disposed on the surface layer of the two sets of concrete structures. The internal waterproof structure includes two sets of interface fusion layers, two sets of functional layers disposed between the two sets of interface fusion layers, and a waterproof core layer disposed between the two sets of functional layers. The upper waterproof structure includes an interface fusion layer 2 disposed on the surface layer and inner waterproof structure of the two sets of concrete structures, a functional layer 2 disposed on the interface fusion layer 2, a waterproof core layer 2 disposed on the functional layer 2, and an outer protective layer disposed on the waterproof core layer 2.

[0010] In some possible implementations, the first waterproof core layer and the second waterproof core layer are the same; including an asphalt layer made of quick-setting rubber asphalt material sprayed on, and a reinforcing mesh embedded in the asphalt layer.

[0011] In some possible implementations, the reinforcing mesh is woven from polyester and / or glass fiber; the shape of the mesh is any one or more of rhombus, square, and hexagonal; the length of the longest diagonal of the mesh is 5 to 20 mm; and the thickness of the reinforcing mesh is 1 to 3 mm.

[0012] In some possible implementations, the interface fusion layer one and the interface fusion layer two are the same and have a thickness of 0.2 to 0.5 mm; the interface fusion layer one or the interface fusion layer two is made by curing water-based epoxy emulsion, cement-based cementitious material and nano-level active filler, wherein the nano-level active filler is nano-silica or nano-calcium carbonate particles with a particle size of 10 to 100 nm.

[0013] In some possible implementations, the first functional layer is the same as the second functional layer, and is made of rubber asphalt closed-cell foam material and microcapsule self-healing agent; the thickness of the first functional layer and the second functional layer is 3-5 mm.

[0014] The microcapsule self-healing agent includes a wall material and a core material encapsulated in the wall material. The wall material is made of melamine-formaldehyde resin or polyurea, and the core material is made of acrylate monomers or epoxy resin. The particle size of the microcapsule self-healing agent is 50-200 μm.

[0015] In some possible implementations, the outer protective layer is made of non-woven fabric; the second waterproof core layer consists of two layers.

[0016] In some possible implementations, a deformation indicator strip is provided between the second functional layer and the second waterproof core layer; The deformation indicator strip includes a carrier substrate disposed on the second functional layer and superabsorbent resin particles fixed on the carrier substrate; the carrier substrate is made of non-woven fabric.

[0017] on the other hand: A construction method for a waterproof layer structure at the junction of adjacent concrete structures as described above specifically includes the following steps: Step S1: Before assembling the concrete structure, treat the bonding surfaces of the concrete structure. Step S2: Apply the interface fusion layer and the functional layer in sequence on the bonding surface. Step S3: After the concrete structure is assembled and the functional layer is fixed, the waterproof core layer is sprayed to complete the internal waterproof structure construction. Specifically, the reinforcing mesh is first laid longitudinally into the gap formed by the two sets of functional layers, and then the quick-setting rubber asphalt material is sprayed to cover the reinforcing mesh to form the waterproof core layer. Step S4: After the construction of the internal waterproofing structure within the construction joint is completed, the surface layer of the concrete structure is treated. Step S5: Apply the second layer of interface fusion coating and the second layer of functional coating sequentially on the surface layer; Step S6: After the functional layer two is dry-fixed, the waterproof core layer two is sprayed; specifically, it means: first, spray quick-setting rubber asphalt material on the functional layer two, then lay a reinforcing mesh on the sprayed and not fully cured quick-setting rubber asphalt material, and continue to spray quick-setting rubber asphalt material on the reinforcing mesh to cover the reinforcing mesh and form the waterproof core layer two. Step S7: Apply the outer protective layer to complete the construction.

[0018] In some possible implementations, the installation of deformation indicator tape is also included after the second functional layer is sprayed and before the second waterproof core layer is sprayed. In some possible implementations, step S7 specifically refers to: laying non-woven fabric on the incompletely cured quick-setting rubber asphalt material and pressing the non-woven fabric tightly with the quick-setting rubber asphalt material to form an outer protective layer.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention establishes an interface fusion layer composed of water-based epoxy emulsion, cement-based cementitious materials, and nano-scale active fillers. The slurry can penetrate into the micropores and capillary cracks of the concrete structure. The nano-fillers react with the concrete hydration products to generate CSH gel through a pozzolanic reaction, forming a strong chemical bond and micro-mechanical interlock. This invention utilizes the water-based epoxy emulsion in the interface fusion layer to not only provide initial adhesion to prevent delamination, but also, after curing, to become a chemical bridge connecting the concrete and the waterproof core layer. This achieves permanent full adhesion between the waterproof system and the concrete substrate, preventing water from flowing between layers and fundamentally solving the inherent water seepage problem of traditional roll-laid methods.

[0020] This invention provides a waterproof composite system formed by an "interface fusion layer - functional layer - waterproof core layer". When concrete cracks, the functional layer first plays a role in stress buffering and dispersion, absorbing and dissipating most of the stress, and protecting the waterproof core layer from direct damage by concentrated stress. In this invention, the waterproof core layer itself employs a composite structure of quick-setting rubber asphalt (flexible body) and a three-dimensional reinforcing mesh (rigid reinforcement), mimicking the reinforcement principle of reinforced concrete. The reinforcing mesh significantly enhances the tensile strength, tear resistance, and puncture resistance of the waterproof layer, effectively inhibiting the upward propagation of cracks. Meanwhile, the rubber asphalt protects the mesh and imparts extremely high elasticity and ductility to the system. This synergistic effect allows the waterproof layer to adapt to normal deformation while resisting abnormal damage. The present invention provides a microcapsule self-healing agent that is uniformly dispersed in the functional layer. When the waterproof layer is accidentally punctured, the microcapsules rupture and release the repair agent (such as acrylate monomer or epoxy resin). After curing, the repair agent automatically blocks the leakage path, thereby achieving intelligent repair of damage and extending the service life of the waterproof layer. In the construction of waterproofing for concrete structures, this invention uses an irreversible deformation indicator strip between the functional layer and the waterproof core layer. The superabsorbent resin particles inside the strip expand rapidly upon contact with water, causing visible protrusions on the surface of the waterproof core layer. This allows for the rapid and accurate location of leaks without the need for complex detection equipment, greatly facilitating precise repairs and routine maintenance in the future. This invention achieves seamless and overall enhanced waterproofing by using a thickened functional layer through spraying, increasing the number of reinforcing mesh layers, and thickening the waterproof core layer, thus solving the sealing problem of these weak points.

[0021] Benfuma specifically targets the joint surfaces of prefabricated assembled structures. By first fusing the fusion layer and functional layer on the joint surfaces of the concrete structure, and then uniformly constructing the waterproof core layer after the structure is assembled, the continuity and integrity of the waterproof system in the joint area are ensured, effectively addressing displacement and settlement between components. This invention forms a perfect water molecule and microbial barrier through the continuous phase of the quick-setting rubber asphalt material; the functional layers are tightly bonded to each other through chemical and physical means, the reinforcing mesh is fully wetted and wrapped, and the interface fusion layer is firmly bonded to the concrete structure, together forming a highly durable and aging-resistant stable system. The outer protective layer in this invention not only protects the waterproof core layer during construction, but also forms a strong mechanical bond with the subsequently poured concrete, further enhancing the integration of the entire system and structure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the internal waterproof structure in this invention; Figure 4 This is a schematic diagram of the waterproof structure in this invention; Figure 5 This is a schematic diagram showing the positional relationship between the two sets of concrete structures after assembly. in: 10. Concrete structure; 101. Bonding surface; 102. Surface layer; 100. Construction joint; 1. Internal waterproof structure; 11. Interface Integration Layer 1; 12. Functional Layer 1; 13. Waterproof Core Layer 1; 131. Quick-setting rubber asphalt material; 132. Reinforcing mesh; 2. Waterproof structure; 21. Interface Fusion Layer 2; 22. Functional Layer 2; 23. Waterproof Core Layer 2; 24. Outer Protective Layer; 25. Deformation Indicator Strip. Detailed Implementation

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "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 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. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] The present invention will now be described in detail.

[0025] like Figures 1-5 As shown: on the one hand: A waterproof layer structure at the junction of adjacent concrete structures includes an inner waterproof structure 1 installed in the construction joint 100 formed by the two sets of concrete structures, and an upper waterproof structure 2 installed on the surface layer 102 of the two sets of concrete structures. The internal waterproof structure 1 includes two sets of interface fusion layers 11, two sets of functional layers 12 disposed between the two sets of interface fusion layers 1, and a waterproof core layer 13 disposed between the two sets of functional layers 12. When the internal waterproofing structure 1 takes the interface 101 of the adjacent concrete structure 10 as the construction target, an interface fusion layer 11 is arranged on the interface 101 of the adjacent concrete structure 10. A functional layer 12 is constructed between the two interface fusion layers 11, and finally a waterproof core layer 13 is constructed between the functional layers 12. The upper waterproof structure 2 includes an interface fusion layer 21 disposed on the surface layer 102 of the two sets of concrete structures 10 and the inner waterproof structure 1, a functional layer 22 disposed on the interface fusion layer 21, a waterproof core layer 23 disposed on the functional layer 22, and an outer protective layer 24 disposed on the waterproof core layer 2. When the waterproof structure 2 targets the surface layer 102 of the concrete structure 10 for waterproofing construction, the interface fusion layer 21, functional layer 22, waterproof core layer 23, and outer protective layer 24 are arranged sequentially on the outside of the surface layer 102 of the concrete structure 10.

[0026] It should be noted that the waterproofing construction of the bonding surface 101 of the concrete structure 10, i.e. the construction of the inner waterproofing structure 1, is carried out before the waterproofing construction of the surface layer 102 of the concrete structure 10, i.e. the construction of the upper waterproofing structure 2. After the construction of the inner waterproofing structure 1 is completed, the construction joint 100 and the bonding surface 101 of the concrete structure 10 are used as the base surface for the construction of the upper waterproofing structure 2.

[0027] In some possible implementations, the waterproof core layer 13 and the waterproof core layer 23 are the same; both include an asphalt layer made by spraying with quick-setting rubber asphalt material 131, and a reinforcing mesh 132 embedded in the asphalt layer and having a mesh structure; the reinforcing mesh 132 is woven from polyester and / or fiberglass; the shape of the mesh is any one or more of rhombus, square, and hexagonal, the length of the longest diagonal of the mesh is 5 to 20 mm, and the thickness of the reinforcing mesh 132 is 1 to 3 mm; Specifically, the quick-setting rubber asphalt material 131 in the waterproof core layer (waterproof core layer 13 and waterproof core layer 23) has excellent quick-setting properties and gels within seconds after spraying, so that the waterproof layer is initially formed and can be easily constructed on the sloping and top surfaces of the concrete structure 10 without sagging. The quick-setting rubber asphalt material 131 has a certain degree of viscosity when it is not fully cured, and can be sprayed to the designed thickness in one go without seams. It can also perfectly wrap and fuse the reinforcing mesh 132. Moreover, the quick-setting rubber asphalt material 131 also has excellent elasticity and ductility to further adapt to the deformation of the concrete structure 10. The dense, fast-setting rubber asphalt material 131 continuous phase forms a perfect water molecule barrier to effectively resist the erosion of groundwater and microorganisms; The reinforcing mesh 132 is easy to lay and press on site, while having sufficient stiffness to maintain itself in the asphalt layer formed by the quick-setting rubber asphalt material 131; and its surface has good compatibility with the quick-setting rubber asphalt material 131 and can be fully impregnated; like the steel bars in concrete, it achieves reinforcement and greatly improves the tensile strength, tear resistance and puncture resistance of the waterproof layer; even if microcracks appear in the concrete structure 10, the reinforcing mesh 132 can effectively disperse stress and prevent cracks from being transmitted to the upper part of the formed waterproof structure (inner waterproof structure 1, upper waterproof structure 2).

[0028] By combining the quick-setting rubber asphalt material 131 of the flexible body with the reinforcing mesh 132 of the rigid reinforcement, the reinforcing mesh 132 restricts the plastic flow of the quick-setting rubber asphalt material 131, thereby increasing its tensile strength and resistance to damage by orders of magnitude. Meanwhile, the quick-setting rubber asphalt material 131 protects the reinforcing mesh 132 from direct impact and aging, and anchors it in three dimensions. It maintains both flexibility and extremely high mechanical strength.

[0029] In some possible implementations, the interface fusion layer 11 is the same as the interface fusion layer 21 and has a thickness of 0.2 to 0.5 mm; the interface fusion layer 11 or the interface fusion layer 21 is made by curing water-based epoxy emulsion, cement-based cementitious material and nano-level active filler, wherein the nano-level active filler is nano-silica or nano-calcium carbonate particles with a particle size of 10 to 100 nm.

[0030] The interface fusion layer is made of water-based epoxy emulsion, cement-based cementitious materials and nano-level active fillers. The high adhesion of the interface fusion layer (interface fusion layer 11 and interface fusion layer 21) can ensure that the entire waterproof system can be effectively bonded to the concrete structure 10. The functional layers (functional layer 12, functional layer 22) can dissipate the stress transmitted from the concrete structure 10, so as to protect the quick-setting rubber asphalt material 131 in the waterproof core layer (waterproof core layer 13, waterproof core layer 23) from structural damage caused by stress, thereby ensuring the effective waterproofing of the waterproof core layer.

[0031] In some possible implementations, the first functional layer 12 is the same as the second functional layer 22, and is made of rubber asphalt closed-cell foam material and microcapsule self-healing agent; the thickness of the first functional layer 12 and the second functional layer 22 is 3-5 mm; The microcapsule self-healing agent includes a wall material and a core material encapsulated in the wall material. The wall material is made of melamine-formaldehyde resin or polyurea, and the core material is made of acrylate monomers or epoxy resin. The particle size of the microcapsule self-healing agent is 50-200 μm. Specifically, the rubber asphalt closed-cell foam material will rapidly foam after spraying, forming a closed-cell foam structure. Due to its volume expansion, it will smoothly cover the interface fusion layer (interface fusion layer 11 and interface fusion layer 21). During the curing process, it will exhibit high elasticity, adapt to the irregularity of the interface fusion layer, and absorb and disperse the stress generated by concrete shrinkage and settlement, preventing cracking at the connection between the waterproof core layer and the interface fusion layer.

[0032] The uniformly distributed microcapsule self-healing agent does not affect normal spraying operations. When the waterproof core layer is punctured, the microcapsule self-healing agent will rupture and release, and after curing, it will block the leakage path.

[0033] In some possible implementations, the outer protective layer 24 is made of non-woven fabric; the second waterproof core layer 23 consists of two layers, with a layer of quick-setting rubber asphalt material 131 sprayed between the two reinforcing meshes 132.

[0034] In some possible implementations, a deformation indicator strip 25 is provided between the second functional layer 22 and the second waterproof core layer 23; The deformation indicator strip 25 includes a carrier substrate disposed on the functional layer 22 and superabsorbent resin particles fixed on the carrier substrate; the carrier substrate is made of non-woven fabric.

[0035] Specifically, the supporting substrate is the skeleton and carrier of the entire deformation indicator strip 25, made of polyester non-woven fabric, which has a large number of pores, thus being able to adapt to the unevenness of the concrete structure surface and the pulling during subsequent construction. It is not easy to tear, and the presence of pores allows it to provide space for embedding and anchoring through adhesives and super absorbent resin particles. When leakage occurs, water can quickly diffuse laterally through these pores and be absorbed by a larger range of superabsorbent resin particles, thereby amplifying the deformation area and causing protrusions on the waterproof core layer, making the leakage point more obvious. The leakage phenomenon can be directly observed from the outside of the structure, which facilitates subsequent waterproofing repairs. The material properties of the substrate do not chemically react with rubber asphalt coatings, water, or superabsorbent resin particles, ensuring long-term stability. It can also withstand the instantaneous heat that may be generated when spraying quick-setting rubber asphalt without shrinking or melting, and can also improve the bonding effect between the functional layer and the waterproof core layer.

[0036] on the other hand: A construction method for a waterproof layer structure at the junction of adjacent concrete structures as described above specifically includes the following steps: Step S1: Before assembling the concrete structure 10, the bonding surface 101 is treated. Specifically, the bonding surface 101 is roughened or roughened, and after cleaning and drying, a rough, clean interface with uneven texture is formed on the bonding surface 101. Step S2: Apply the interface fusion layer 11 and the functional layer 12 sequentially on the bonding surface 101. Step S3: After the concrete structure 10 is assembled and the functional layer 12 is fixed, the waterproof core layer 13 is sprayed to complete the construction of the inner waterproof structure 1. Specifically, the reinforcing mesh 132 is first laid longitudinally into the gap formed by the two sets of functional layers 12, and then the quick-setting rubber asphalt material 131 is sprayed to cover the reinforcing mesh 132 to form the waterproof core layer 13. Step S4: After the construction of the inner waterproof structure 1 within the construction joint 100 is completed, the surface layer 102 of the concrete structure 10 is treated in the same way as the treatment on the bonding surface 101. Step S5: Apply the second interface fusion layer 21 and the second functional layer 22 sequentially on the surface layer 102. Step S6: Laying of deformation indicator tape 25; Specifically, the deformation indicator tape is laid on functional layer 22 in a staggered arrangement of horizontal and vertical directions. Step S7: After the functional layer 22 is dried and fixed, the waterproof core layer 23 is sprayed; specifically, it means: first, spray quick-setting rubber asphalt material 131 on the functional layer 22, then lay the reinforcing mesh 132 on the sprayed and not fully cured quick-setting rubber asphalt material 131, and continue to spray quick-setting rubber asphalt material 131 on the reinforcing mesh 132 to cover the reinforcing mesh 132, thus forming the waterproof core layer 23; Step S8: Laying out the outer protective layer 24 to complete the construction; specifically, it means laying non-woven fabric on the uncured quick-setting rubber asphalt material 131 and pressing the non-woven fabric tightly with the quick-setting rubber asphalt material 131 to form an outer protective layer.

[0037] It should be noted that when constructing the internal and external corners of the concrete structure 10, the joints of the through-wall pipes, and the joint surfaces 101 of adjacent concrete structures 10, joint reinforcement treatment is carried out, including spraying thickened functional layer 12 or increasing the number of reinforcing mesh layers 132, and thickening the waterproof core layer (waterproof core layer 13, waterproof core layer 23).

[0038] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A waterproof layer structure at the junction of adjacent concrete structures, characterized in that, This includes an internal waterproofing structure installed within the construction joint formed by the two sets of concrete structures, and an upper waterproofing structure installed on the surface layer of the two sets of concrete structures. The internal waterproof structure includes two sets of interface fusion layers, two sets of functional layers disposed between the two sets of interface fusion layers, and a waterproof core layer disposed between the two sets of functional layers. The upper waterproof structure includes an interface fusion layer 2 disposed on the surface layer and inner waterproof structure of the two sets of concrete structures, a functional layer 2 disposed on the interface fusion layer 2, a waterproof core layer 2 disposed on the functional layer 2, and an outer protective layer disposed on the waterproof core layer 2.

2. The waterproof layer structure at the junction of adjacent concrete structures according to claim 1, characterized in that, The first and second waterproof core layers are the same; they include an asphalt layer made of quick-setting rubber asphalt material sprayed on, and a reinforcing mesh embedded in the asphalt layer.

3. The waterproof layer structure at the junction of adjacent concrete structures according to claim 2, characterized in that, The reinforcing mesh is woven from polyester and / or fiberglass; the mesh shape is any one or more of rhombus, square, and hexagonal; the longest diagonal of the mesh is 5-20 mm; and the thickness of the reinforcing mesh is 1-3 mm.

4. The waterproof layer structure at the junction of adjacent concrete structures according to claim 1, characterized in that, The interface fusion layer one and interface fusion layer two are the same and have a thickness of 0.2 to 0.5 mm. The interface fusion layer one or interface fusion layer two is made by curing water-based epoxy emulsion, cement-based cementitious material and nano-level active filler. The nano-level active filler is nano-silica or nano-calcium carbonate particles with a particle size of 10 to 100 nm.

5. The waterproof layer structure at the junction of adjacent concrete structures according to claim 1, characterized in that, The first functional layer is the same as the second functional layer, and is made of rubber asphalt closed-cell foam material and microcapsule self-healing agent; the thickness of the first functional layer and the second functional layer is 3-5 mm; the microcapsule self-healing agent includes a wall material and a core material encapsulated in the wall material, wherein the wall material is made of melamine formaldehyde resin or polyurea, the core material is made of acrylate monomer or epoxy resin, and the particle size of the microcapsule self-healing agent is 50-200 μm.

6. The waterproof layer structure at the junction of adjacent concrete structures according to claim 1, characterized in that, The outer protective layer is made of non-woven fabric; the second waterproof core layer consists of two layers.

7. The waterproof layer structure at the junction of adjacent concrete structures according to claim 1, characterized in that, A deformation indicator strip is provided between the second functional layer and the second waterproof core layer; The deformation indicator strip includes a carrier substrate disposed on the second functional layer and superabsorbent resin particles fixed on the carrier substrate; the carrier substrate is made of non-woven fabric.

8. A construction method for a waterproof layer structure at the junction of adjacent concrete structures according to any one of claims 1-7, characterized in that, Specifically, the following steps are included: Step S1: Before assembling the concrete structure, treat the bonding surfaces of the concrete structure. Step S2: Apply the interface fusion layer and the functional layer in sequence on the bonding surface. Step S3: After the concrete structure is assembled and the functional layer is fixed, the waterproof core layer is sprayed to complete the internal waterproof structure construction. Specifically, the reinforcing mesh is first laid longitudinally into the gap formed by the two sets of functional layers, and then the quick-setting rubber asphalt material is sprayed to cover the reinforcing mesh to form the waterproof core layer. Step S4: After the construction of the internal waterproofing structure within the construction joint is completed, the surface layer of the concrete structure is treated. Step S5: Apply the second layer of interface fusion coating and the second layer of functional coating sequentially on the surface layer; Step S6: After the functional layer two is dry-fixed, the waterproof core layer two is sprayed; specifically, it means: first, spray quick-setting rubber asphalt material on the functional layer two, then lay a reinforcing mesh on the sprayed and not fully cured quick-setting rubber asphalt material, and continue to spray quick-setting rubber asphalt material on the reinforcing mesh to cover the reinforcing mesh and form the waterproof core layer two. Step S7: Apply the outer protective layer to complete the construction.

9. A construction method for a waterproof layer structure at the junction of adjacent concrete structures according to claim 8, characterized in that, This also includes laying deformation indicator strips after the second coating of the functional layer is completed and before the second coating of the waterproof core layer is applied.

10. A construction method for a waterproof layer structure at the junction of adjacent concrete structures according to claim 8, characterized in that, Specifically, step S7 refers to laying non-woven fabric on the incompletely cured quick-setting rubber asphalt material and pressing the non-woven fabric tightly with the quick-setting rubber asphalt material to form an outer protective layer.

Images