Composite skin type waterproof system and shallow-buried excavation tunnel skin type waterproof construction method

Abstract

The invention discloses a composite skin type waterproof system and a shallow-buried excavation tunnel skin type waterproof construction method, a construction waterproof structure is arranged between a primary lining concrete layer and a secondary lining concrete layer, the construction waterproof structure comprises a waterproof coiled material and a persistent adhesive waterproof coating arranged on the surface of the waterproof coiled material, and in the composite skin type waterproof system, a waterproof layer is arranged on the surface of the waterproof coiled material. The first side face of the waterproof roll is tightly attached to the primary lining concrete layer, the second side face of the waterproof roll faces the secondary lining concrete layer, the persistent adhesion waterproof coating is arranged on the second side face, after secondary lining concrete is poured, the concrete and the persistent adhesion waterproof coating are subjected to chemical reaction in the hardening process, mechanical interlocking type interface bonding is formed, and the waterproof roll is formed. Therefore, the construction waterproof structure and the upstream face of the post-poured second lining concrete layer form integral water resistance, the composite skin type waterproof system has the advantages of being not prone to water channeling and water point leakage and the like, and permeation and fluid channeling of water to the surface of second lining concrete are resisted.

Description

Technical Field

[0001] The invention relates to the technical field of waterproof construction engineering for shallow buried dark excavated tunnels, and more specifically to a composite skin-type waterproof system and a skin-type waterproof construction method for shallow buried dark excavated tunnels. Background Art

[0002] The waterproofing of traditional underground engineering structures adopts "raincoat-style" waterproofing, and the waterproofing membrane is fixed by nailing + bonding method on the water-facing surface of the structure. This method has extremely high requirements for the flatness of the structural surface. It is often difficult to make the waterproofing membrane fit tightly with the structural body during waterproofing construction. Groundwater and surface seepage flow into the underground structure through the gap between the membrane and the structure, causing the "water-through" phenomenon, which ultimately makes it difficult to ensure the waterproofing effect of the underground structure project. In traditional mountain tunnel waterproofing construction, prefabricated PVC waterproof membranes are usually installed between the primary lining and the secondary lining of the tunnel as a partition and sliding layer between the linings, which basically eliminates the shear force between the two layers of the structure. However, the PVC waterproof membrane does not adhere to the sprayed concrete and the lining concrete, and gaps are easily generated; secondly, the PVC waterproof membrane is flat and difficult to fully fit with the irregular curved surface inside the tunnel, which is not only difficult to install, but also difficult to repair when water seeps. At the same time, the "water-through" phenomenon makes it difficult to accurately detect leakage, resulting in the failure of the entire waterproof layer, and there are many processes in the process of finding the leakage point, which harms the overall quality of the tunnel. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a composite skin type waterproof system to solve the problems of poor waterproof construction effect and easy water leakage in shallow buried and dark excavated tunnels.

[0004] The technical solution of the present invention is as follows: a composite skin waterproof system, comprising a primary lining concrete layer and a secondary lining concrete layer, a construction waterproof structure is arranged between the primary lining concrete layer and the secondary lining concrete layer, the construction waterproof structure comprises a waterproof membrane and a persistent waterproof coating arranged on the surface of the waterproof membrane, the first side of the waterproof membrane is closely attached to the primary lining concrete layer, the second side of the waterproof membrane faces the secondary lining concrete layer, the persistent waterproof coating is arranged on the second side of the waterproof membrane, the first side and the second side are respectively located on opposite sides of the waterproof membrane, and the thickness of the persistent waterproof coating is 1 mm to 1.5 mm.

[0005] Furthermore, the persistent adhesive waterproof coating is a composite waterproof layer, and the persistent adhesive waterproof coating includes a first coating and a second coating, the first coating and the second coating are respectively sprayed and atomized through two nozzles in an airless spray system, and the first coating and the second coating are cross-mixed in a fan shape outside the nozzle to form a composite waterproof layer on the second side of the waterproof membrane.

[0006] Furthermore, the first coating comprises anionic rubber latex and emulsified asphalt, wherein the rubber latex comprises one or more of chloroprene latex, styrene butadiene latex and carboxylated styrene butadiene latex, and the second coating is an aqueous solution with a concentration of 3.0% to 5.0% prepared from a metal salt electrolyte.

[0007] Furthermore, the volume ratio of the first coating material to the second coating material is 7:3.

[0008] Furthermore, the waterproof coiled material is fixed on the primary lining concrete layer by nailing, and the distance between two adjacent nails is 400 mm to 500 mm.

[0009] In addition, the present invention also provides a skin-type waterproof construction method for a shallow buried dark excavated tunnel, which is applied to the above-mentioned composite skin-type waterproof system and includes the following steps:

[0010] S1, laying a waterproof membrane on the primary lining concrete layer, and sequentially passing a plurality of nails through the waterproof membrane to fix the waterproof membrane on the primary lining concrete layer;

[0011] S2, pressurizing the surface of the waterproof coiled material to make the waterproof coiled material fit the primary lining concrete layer;

[0012] S3, spraying a 1 mm to 1.5 mm thick persistent waterproof coating on the second side of the waterproof coiled material;

[0013] S4. Construct the secondary lining and pour concrete to form a second lining concrete layer to construct a composite lining structure.

[0014] Furthermore, in step S1, multiple groups of the waterproof membranes are laid along the length direction of the tunnel, the multiple nails are arranged in a matrix distribution, and the distance between two adjacent nails is 400mm to 500mm, and then the nails are covered and repaired with 100mm×100mm waterproof membranes.

[0015] Furthermore, in step S2, the surface of the waterproof coiled material is pressurized to make the waterproof coiled material adhere to the primary lining concrete layer; specifically, the following steps are included:

[0016] S21, applying a pressure of 0.02MPa to 0.05MPa from the laying center of the single set of waterproof membranes toward the surroundings by means of a pressure roller, so that the waterproof membranes are bonded to the primary lining concrete layer;

[0017] S22. The joint between the two waterproof membranes is sealed by edge sealing material, and the joint between the two waterproof membranes is struck by a rubber hammer.

[0018] Furthermore, before step S1, the sunken parts on the surface of the primary lining concrete layer are repaired, and then the floating slurry and sand on the surface of the primary lining concrete layer are cleaned by a shot blasting machine or a grinder.

[0019] Furthermore, the waterproof membrane is a polyethylene polypropylene composite waterproof membrane or an SBS waterproof membrane.

[0020] The present invention according to the above scheme has the following beneficial effects:

[0021] (1) The present invention provides a composite skin waterproof system, in which a construction waterproof structure is arranged between a primary lining concrete layer and a secondary lining concrete layer. The primary lining concrete layer serves as the primary supporting structure of the tunnel, and the secondary lining concrete layer further reinforces the tunnel structure and provides a flat inner wall surface. The construction waterproof structure includes a waterproof membrane and a persistent waterproof coating arranged on the surface of the waterproof membrane. In the composite skin waterproof system, a first side of the waterproof membrane is in close contact with the primary lining concrete layer, while a second side faces the secondary lining concrete layer. The persistent waterproof coating is arranged on the second side. After the secondary lining concrete is poured, a chemical reaction occurs between the concrete and the persistent waterproof coating during the hardening process to form a mechanical interlocking interface bonding, thereby making the construction waterproof structure and the water-facing surface of the later poured secondary lining concrete layer form an integral waterproof structure, so that the composite skin waterproof system has the advantages of being not easy to cause water leakage and water seepage points, and resists water from penetrating and flowing through the surface of the secondary lining concrete.

[0022] (2) The present invention provides a composite skin waterproof system, in which the construction waterproof structure is a composite structure, and the construction waterproof structure is arranged between the primary lining concrete layer and the secondary lining concrete layer, and the second side of the construction waterproof structure faces the secondary lining concrete layer. When the secondary lining concrete is poured, the adhesive waterproof coating on the second side contacts the cement mortar or concrete of the secondary lining concrete layer, and the high molecular polymer (chain segment) in the adhesive waterproof coating and the cement hydrate (silicate network) penetrate each other to form an (interface) interpenetrating network (PIN) structure. The adhesive waterproof coating and the surface of the secondary lining concrete layer are connected together through physical and interfacial chemical effects such as infiltration, adsorption, and diffusion. The cement can flow, penetrate or impregnate on the construction waterproof structure before initial setting, and bite with the construction waterproof structure during the cement solidification process, thereby further enhancing the waterproof effect.

[0023] (3) The present invention provides a composite skin-type waterproof system, in which the thickness of the adhesive waterproof coating is 1 mm to 1.5 mm. This design allows the adhesive waterproof coating to fully react or penetrate with cement hydrates during the concrete hardening process to form a firm interface connection, which not only ensures sufficient contact between the adhesive waterproof coating and the concrete, but also avoids interface weakening caused by excessive thickness of the adhesive waterproof coating. When the thickness of the adhesive waterproof coating is less than 1 mm, the content of the high molecular polymer (chain segment) inside it is insufficient to fully react or penetrate with cement hydrates (silicate network), resulting in a weak interface connection between the adhesive waterproof coating and the concrete, thereby affecting the waterproof performance; when the thickness of the adhesive waterproof coating exceeds 1.5 mm, the overly thick adhesive waterproof coating is prone to stratification due to uneven internal stress distribution during the concrete hardening process. Stratification will result in a weak interface connection between the adhesive waterproof coating and the concrete, reducing the waterproof performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 Schematic diagram of the structure of a shallow buried dark excavated tunnel in an embodiment of the present invention;

[0026] Figure 2 Schematic diagram of the structure of the composite skin waterproof system in an embodiment of the present invention.

[0027] In the figure, 1. primary lining concrete layer; 2. secondary lining concrete layer; 3. construction of waterproof structure; 31. waterproof membrane; 32. persistent waterproof coating. DETAILED DESCRIPTION

[0028] The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

[0029] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0030] See also Figure 1-2As shown, in a preferred embodiment of the present invention, a composite skin type waterproof system is provided, comprising a primary lining concrete layer 1 and a secondary lining concrete layer 2, a construction waterproof structure 3 is arranged between the primary lining concrete layer 1 and the secondary lining concrete layer 2, the construction waterproof structure 3 comprises a waterproof membrane 31 and a persistent waterproof coating 32 arranged on the surface of the waterproof membrane 31, a first side of the waterproof membrane 31 is in close contact with the primary lining concrete layer 1, a second side of the waterproof membrane 31 faces the secondary lining concrete layer 2, the persistent waterproof coating 32 is arranged on the second side of the waterproof membrane 31, the first side and the second side are respectively located on opposite sides of the waterproof membrane 31, and the thickness of the persistent waterproof coating 32 is 1 mm to 1.5 mm. In this embodiment, the secondary lining concrete layer 2 of the tunnel is poured after the construction waterproof structure 3 is laid. During the pouring process, a certain extrusion stress will be generated on the construction waterproof structure 3, so that the primary lining concrete layer 1 and the construction waterproof structure 3 are tightly bonded. At the same time, the construction waterproof structure 3 plays a role of a lubricating isolation layer in the hydration and solidification process of the secondary lining concrete layer 2, reducing the constraint of the primary lining on the secondary lining concrete, so that the probability of cracks in the secondary lining concrete layer 2 is reduced.

[0031] Specifically, a construction waterproof structure 3 is arranged between the primary lining concrete layer 1 and the secondary lining concrete layer 2. The primary lining concrete layer 1 serves as the primary supporting structure of the tunnel, and the secondary lining concrete layer 2 further reinforces the tunnel structure and provides a smooth inner wall surface. The construction waterproof structure 3 includes a waterproof membrane 31 and a persistent waterproof coating 32 arranged on the surface of the waterproof membrane 31. In the composite skin waterproof system, the first side of the waterproof membrane 31 is in close contact with the primary lining concrete layer 1, while the second side faces the secondary lining concrete layer 2. The persistent waterproof coating 32 is arranged on the second side. After the secondary lining concrete is poured, the concrete reacts chemically with the persistent waterproof coating 32 during the hardening process to form a mechanical interlocking interface bonding, thereby making the construction waterproof structure 3 and the water-facing surface of the later poured secondary lining concrete layer form an integral waterproof, so that the composite skin waterproof system has the advantages of not being easy to cause water leakage and water seepage points, and resists the penetration and flow of water to the surface of the secondary lining concrete.

[0032] In this embodiment, the construction waterproof structure 3 is a composite structure. The construction waterproof structure 3 is arranged between the primary lining concrete layer 1 and the secondary lining concrete layer 2. The second side of the construction waterproof structure 3 faces the secondary lining concrete layer 2. When the secondary lining concrete is poured, the adhesive waterproof coating 32 located on the second side contacts the cement mortar or concrete of the secondary lining concrete layer 2. The high molecular polymer (chain segment) in the adhesive waterproof coating 32 and the cement hydrate (silicate network) penetrate each other to form an (interface) interpenetrating network (PIN) structure. The adhesive waterproof coating 32 and the surface of the secondary lining concrete layer 2 are connected together through physical and interfacial chemical effects such as infiltration, adsorption, and diffusion. The cement can flow, penetrate or impregnate on the construction waterproof structure 3 before initial setting. The cement bites with the construction waterproof structure 3 during the solidification process, further enhancing the waterproof effect.

[0033] It is worth mentioning that the inventors have found that when the thickness of the persistent waterproof coating 32 is too small, the content of the high molecular polymer (chain segment) inside it is relatively small, which is insufficient to form a sufficient reaction and penetration with the cement hydrate (silicate network). This insufficient reaction will cause the interface connection between the persistent waterproof coating 32 and the concrete to be not strong enough, thereby affecting the waterproof performance of the entire waterproof system. When the thickness of the persistent waterproof coating 32 is too thick, the excessively thick persistent waterproof coating 32 is prone to stratification during the concrete hardening process due to uneven internal stress distribution. The stratification not only weakens the connection strength between the persistent waterproof coating 32 and the concrete, but also may become a channel for water penetration, thereby reducing the waterproof performance.

[0034] Based on the above analysis, the present invention proposes an optimal thickness range of 1mm to 1.5mm for the persistent waterproof coating 32. This design ensures that the persistent waterproof coating 32 can fully react and penetrate with cement hydrates during the concrete hardening process to form a firm interface connection; it also avoids the problem of interface weakening caused by excessively thick coatings. The persistent waterproof coating 32 can exert the best waterproof effect within this thickness range, ensuring that the overall performance of the composite skin waterproof system is stable and reliable.

[0035] In this embodiment, the persistent waterproof coating 32 is a composite waterproof layer, which includes a first coating and a second coating. The first coating and the second coating are respectively sprayed and atomized through two nozzles in an airless spray system. The first coating and the second coating are cross-mixed in a fan shape outside the nozzle to form a composite waterproof layer on the second side of the waterproof membrane 31.

[0036] Specifically, the first coating and the second coating are sprayed out through two independent nozzles in the airless spray system equipment. Outside the nozzle, the first coating and the second coating are mixed in a fan-shaped cross-shaped manner, which not only ensures the uniform distribution of the coating, but also promotes the chemical reaction or physical combination between the coatings, thereby forming a dense composite waterproof layer on the second side of the waterproof coiled material 31. The airless spray system is used to spray the coating through high pressure, avoiding bubbles and particles that may be generated in the traditional spraying process, thereby ensuring the uniformity and density of the waterproof layer. At the same time, the fan-shaped cross-mixing method makes the coatings closely combined, further improving the strength and durability of the waterproof layer.

[0037] It should be noted that the airless spray system equipment is common knowledge in the art, and the present application does not make improvements to the specific structure of the airless spray system equipment. Therefore, the present application does not elaborate on the airless spray system equipment.

[0038] Specifically, the first coating includes anionic rubber latex and emulsified asphalt, wherein the rubber latex includes one or more of chloroprene latex, styrene butadiene latex and carboxylated styrene butadiene latex, and the second coating is an aqueous solution with a concentration of 3.0% to 5.0% prepared by metal salt electrolytes. Among them, rubber latexes such as chloroprene latex, styrene butadiene latex and carboxylated styrene butadiene latex have good elasticity and adhesion, can be closely combined with cement hydrates during the concrete hardening process to form a firm interface connection, and can also effectively resist the tiny deformation of concrete caused by temperature changes or external forces, and prevent cracks in the waterproof layer; emulsified asphalt can form a dense waterproof layer on the concrete surface, effectively preventing water penetration; at the same time, emulsified asphalt can also react chemically with cement hydrates in concrete to further enhance the waterproof effect.

[0039] In this embodiment, the second coating is a 3.0% to 5.0% aqueous solution prepared from a metal salt electrolyte. The concentration of the metal salt electrolyte is within the range of 3.0% to 5.0%. This design allows the metal salt electrolyte to fully react with the components in the first coating (such as rubber emulsion and emulsified asphalt) to form a dense and high-strength composite waterproof layer, so that the composite waterproof layer not only has excellent waterproof performance, but also can effectively resist the erosion of the external environment, thereby extending the service life of the composite waterproof layer.

[0040] It is worth mentioning that the inventors have found that if the concentration of the metal salt electrolyte is less than 3.0%, the content of the effective component in the second coating is reduced. Too low a concentration easily leads to an insufficiently dense cross-linked network formed in the persistent waterproof coating 32, resulting in a decrease in the performance of the persistent waterproof coating 32 after curing, and difficulty in forming a uniform and dense coating during the film-forming process, thereby increasing the risk of water penetration and affecting the protective performance of the persistent waterproof coating 32. If the concentration of the metal salt electrolyte exceeds 5.0%, it is easy to cause the persistent waterproof coating 32 to generate excessive internal stress during the curing process, thereby destroying its waterproof performance.

[0041] In this embodiment, the volume ratio of the first coating material to the second coating material is 7:3.

[0042] The inventor found that if there are too many puncture points on the waterproofing membrane, it will not only increase the workload of the waterproofing construction for the later repair work, but also the construction quality of each repair point must be strictly tested during construction to avoid the hidden danger of water seepage, which will also increase the difficulty of construction; according to the actual use effect, the probability of leakage at the later repair points is relatively high. Based on this, the waterproofing membrane 31 in this embodiment is fixed to the primary lining concrete layer 1 by nailing, and the distance between two adjacent nails is 400mm to 500mm. This design can not only fix the waterproofing membrane 31 on the primary lining concrete layer 1, but also effectively reduce the puncture points on the waterproofing membrane 31, reducing the later repair work and repair difficulty.

[0043] For further explanation, the embodiment of the present invention also provides a skin-type waterproof construction method for a shallow buried dark excavated tunnel, which is applied to the above-mentioned composite skin-type waterproof system, and includes the following steps:

[0044] S1, laying the waterproofing membrane 31 on the primary lining concrete layer 1, and sequentially passing a plurality of nails through the waterproofing membrane 31 to fix the waterproofing membrane 31 on the primary lining concrete layer 1;

[0045] Specifically, multiple groups of waterproof membranes 31 are laid along the length direction of the tunnel, multiple nails are arranged in a matrix distribution, and the distance between two adjacent nails is 400mm to 500mm, and then the nails are covered and repaired with 100mm×100mm waterproof membranes 31.

[0046] S2, pressurizing the surface of the waterproofing coiled material 31 to make the waterproofing coiled material 31 fit the primary lining concrete layer 1;

[0047] Specifically, in step S2, the surface of the waterproof coiled material 31 is pressurized to make the waterproof coiled material 31 adhere to the primary lining concrete layer 1, which specifically includes the following steps:

[0048] S21, applying a pressure of 0.02MPa to 0.05MPa from the laying center of the single set of waterproof membrane 31 to the surroundings through a pressure roller, so that the waterproof membrane 31 is attached to the primary lining concrete layer 1;

[0049] S22, the joint of the two waterproof membranes 31 is sealed by edge sealing material, and the joint of the two waterproof membranes 31 is struck by a rubber hammer.

[0050] S3, spraying a 1 mm to 1.5 mm thick persistent waterproof coating 32 on the second side of the waterproof coiled material 31;

[0051] S4. Construct the secondary lining and pour concrete to form a second lining concrete layer 2 to construct a composite lining structure.

[0052] In this embodiment, before step S1, the sunken parts on the surface of the primary lining concrete layer 1 are repaired, and then the floating slurry and sand on the surface of the primary lining concrete layer 1 are cleaned by a shot blasting machine or a grinder.

[0053] In this embodiment, the waterproof roll 31 is a polyethylene polypropylene composite waterproof roll or a SBS waterproof roll.

[0054] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

[0055] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A composite skin waterproof system, characterized in that: include: A primary lining concrete layer (1) and a secondary lining concrete layer (2), wherein a construction waterproof structure (3) is arranged between the primary lining concrete layer (1) and the secondary lining concrete layer (2), wherein the construction waterproof structure (3) comprises a waterproof coiled material (31) and a persistent waterproof coating (32) arranged on the surface of the waterproof coiled material (31), wherein a first side surface of the waterproof coiled material (31) is in close contact with the primary lining concrete layer (1), and a second side surface of the waterproof coiled material (31) faces the secondary lining concrete layer (2), and the persistent waterproof coating (32) is arranged on the second side surface of the waterproof coiled material (31), wherein the first side surface and the second side surface are respectively located on two opposite sides of the waterproof coiled material (31), and the thickness of the persistent waterproof coating (32) is 1 mm to 1.5 mm.

2. A composite skin waterproof system as claimed in claim 1, characterized in that: The persistent waterproof coating (32) is a composite waterproof layer, and comprises a first coating and a second coating. The first coating and the second coating are respectively sprayed and atomized through two nozzles in an airless spray system device, and the first coating and the second coating are cross-mixed in a fan shape outside the nozzle, so as to form a composite waterproof layer on the second side of the waterproof coiled material (31).

3. A composite skin waterproof system as claimed in claim 2, characterized in that: The first coating comprises anionic rubber latex and emulsified asphalt, wherein the rubber latex comprises one or more of chloroprene latex, styrene butadiene latex and carboxylated styrene butadiene latex, and the second coating is an aqueous solution with a concentration of 3.0% to 5.0% prepared from a metal salt electrolyte.

4. A composite skin waterproof system as claimed in claim 2, characterized in that: The volume ratio of the first coating material to the second coating material is 7:

3.

5. A composite skin waterproof system as claimed in claim 2, characterized in that: The waterproof coiled material (31) is fixed to the primary lining concrete layer (1) by means of nails, and the distance between two adjacent nails is 400 mm to 500 mm.

6. A skin-type waterproof construction method for a shallow buried tunnel, applied to the composite skin-type waterproof system according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, laying a waterproofing coiled material (31) on the primary lining concrete layer (1), and sequentially passing a plurality of nails through the waterproofing coiled material (31) to fix the waterproofing coiled material (31) on the primary lining concrete layer (1); S2, applying pressure to the surface of the waterproof coiled material (31) so that the waterproof coiled material (31) is bonded to the primary lining concrete layer (1); S3, spraying a persistent waterproof coating (32) with a thickness of 1 mm to 1.5 mm on the second side surface of the waterproof coiled material (31); S4. Construct the secondary lining and pour concrete to form a second lining concrete layer (2), thereby constructing a composite lining structure.

7. A composite skin waterproof system as claimed in claim 6, characterized in that: In step S1, a plurality of groups of the waterproofing coiled materials (31) are laid along the length direction of the tunnel, the plurality of the nails are arranged in a matrix distribution, and the distance between two adjacent nails is 400 mm to 500 mm, and then the nails are covered and repaired with the waterproofing coiled materials (31) of 100 mm×100 mm.

8. A composite skin waterproof system as claimed in claim 6, characterized in that: In step S2, the surface of the waterproof coiled material (31) is pressurized so that the waterproof coiled material (31) is bonded to the primary lining concrete layer (1); The specific steps include: S21, applying a pressure of 0.02MPa-0.05MPa from the laying center of a single set of the waterproof coiled material (31) toward the surroundings by means of a pressure roller, so that the waterproof coiled material (31) is bonded to the primary lining concrete layer (1); S22, the joint between the two waterproof rolls (31) is sealed by edge sealing material, and the joint between the two waterproof rolls (31) is struck with a rubber hammer.

9. A composite skin waterproof system as claimed in claim 6, characterized in that: Before step S1, the sunken parts on the surface of the primary lining concrete layer (1) are repaired, and then the floating slurry and sand on the surface of the primary lining concrete layer (1) are cleaned by a shot blasting machine or a grinder.

10. A composite skin waterproof system as claimed in claim 6, characterized in that: The waterproof roll (31) is a polyethylene polypropylene composite waterproof roll or an SBS waterproof roll.

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