A waterproof structure for precast inverted arch blocks in tunnels

Abstract

The present invention discloses a waterproof structure for precast invert blocks of tunnels, which relates to the technical field of waterproof structures for precast invert blocks of tunnels. A waterproof structure is formed by combining a water-swelling waterstop strip with a grouting pipe and a KS permeable self-healing waterproof material layer. The waterproof structure scheme for precast invert blocks of tunnels provided by the present invention has a wide process application range, has the ability to repair microcracks and waterproof itself, has high construction efficiency, and low comprehensive cost.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof structures for precast inverted arches of tunnels, and specifically to a waterproof structure for precast inverted arches of tunnels. Background Art

[0002] In the construction of railway tunnels, the mining method was mostly used in the past. For the tunnel foundation, cast-in-place concrete inverted arches were usually involved. For the inverted arches of tunnels constructed by this method, due to poor construction conditions, it was difficult to control the quality of the inverted arches. Therefore, during the construction process, precast inverted arches were mostly used according to the environmental conditions at the construction site. When using cast-in-place concrete inverted arches, the lining concrete needed to be poured in sections during the construction process, and expansion joints were set between sections. When using precast inverted arches, there would be assembly gaps between the modules. Whether it was the assembly gaps or the expansion joints, their purpose during the subsequent use of the tunnel was to avoid cracking and damage of the concrete caused by factors such as thermal expansion and contraction due to temperature changes or uneven settlement. Rubber waterstops were used to be set at the expansion joints or assembly gaps to prevent groundwater from seeping up from the gaps to the surface of the inverted arch.

[0003] Currently, for the transverse and longitudinal waterproof measures of precast components of tunnel invert in tunnel engineering, water-swelling rubber waterstop strips or water-swelling rubber waterstop strips with grouting pipes are mostly used for waterproofing. Among them, the water-swelling rubber waterstop strip with a grouting pipe can be filled with gas or low-hardness polyurethane elastomer.

[0004] At the same time, in some precast subway stations, because the components need to be immersed in soil and water for a long time, the joints of the components can also adopt 4 waterproof measures of "two gaskets, one grouting, and one caulking", that is: 2 rubber gaskets, 1 joint filling grouting, and 1 caulking at the inner side of the structure joint.

[0005] These solutions all have corresponding problems in the actual application process, which are specifically as follows:

[0006] For the solution using water-swelling rubber waterstop strips, it is usually applicable to areas with underdeveloped groundwater, and usually only 1 waterproof structure is set. If it is damaged during the construction process, its waterproof effect will be reduced, and there is no self-remedial measure.

[0007] For the solution using water-swelling rubber waterstop strips with grouting pipes for waterproofing, it is usually applicable to areas with developed groundwater, and usually only 1 waterproof structure is set. If it is damaged during the construction process, its waterproof effect will be reduced, and there is no self-remedial measure.

[0008] For the solution using 4 waterproof measures of "two gaskets, one grouting, and one caulking", it is usually applicable to components immersed in water for a long time, with 4 waterproof structures set. The construction process is complex, the efficiency is low, and the construction cost is high.

[0009] Therefore, it is an urgent problem in this field to provide a waterproofing solution for tunnel precast invert blocks that can adapt to various application environments, has self-healing ability, and high construction efficiency. Summary of the Invention

[0010] In view of the deficiencies of the prior art, the present invention provides a waterproof structure for tunnel precast invert blocks, which can be applied to various environments, has the ability to repair micro-cracks and waterproof, is easy to construct, and can effectively overcome the problems existing in the prior art.

[0011] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0012] A waterproof structure for tunnel precast invert blocks forms a waterproof structure by combining a water-swelling waterstop strip with a grouting pipe and a KS permeable self-healing waterproof material layer.

[0013] Furthermore, in the waterproof structure, a low-hardness polyurethane elastomer is used to fill the water-swelling waterstop strip with a grouting pipe.

[0014] Furthermore, the waterproof structure includes two tunnel precast invert block bodies and two bonding members. A water-swelling waterstop strip with a grouting pipe is fixedly connected to the opposite sides of the two bonding members, and limiting grooves are provided on both sides of the precast invert block body;

[0015] The water-swelling waterstop strip with a grouting pipe includes a flexible waterstop sealant strip fixedly connected to the opposite sides of the two bonding members. A pouring hole is provided in the middle of one end of the flexible waterstop sealant strip, and the pouring hole penetrates from one end of the flexible waterstop sealant strip to the other end. A porous elastic structure is provided in the flexible waterstop sealant strip around the pouring hole along the length direction of the flexible waterstop sealant strip to improve the resilience of the flexible waterstop sealant strip. An elastomer is poured into the pouring hole, and the material of the elastomer is polyurethane.

[0016] Furthermore, the porous elastic structure includes a honeycomb-like cavity structure formed inside the flexible waterstop sealant strip. The honeycomb-like cavity structure is used to improve the resilience of the flexible waterstop sealant strip, and the flexible waterstop sealant strip has the property of swelling when encountering water.

[0017] Furthermore, the volume ratio of the honeycomb-like cavity structure to the volume of the flexible waterstop sealant strip is greater than or equal to 2 / 3, and the number of regular hexagonal cavities in the honeycomb-like cavity structure is greater than or equal to 7, and the size of the hexagon can be adjusted according to the elastic requirements of the flexible waterstop sealant strip.

[0018] Furthermore, four symmetrically distributed flexible strengthening meshes are preset near the honeycomb cavity structure during the pouring of the flexible water-stop sealing strip. The flexible strengthening mesh is woven by using glass fiber with a warp and weft weaving method, and a plurality of grid holes are enclosed by warp and weft together.

[0019] Furthermore, the water-stop belt is made of modified CM rubber, and the shape of the water-stop belt is an inverted rectangle. The lower surface of the water-stop belt is the water-facing surface, and the area ratio of its lower surface to the upper surface is 2 / 3.

[0020] Furthermore, a rubber pad is fixedly connected to the lower surface of the flexible water-stop sealing strip. Auxiliary drainage channels are provided at the bottom of one side of the tunnel precast invert block body and the rubber pad. KS permeable self-healing waterproof material is coated at the joint of the upper surfaces of the two tunnel precast invert block bodies. This kind of cement-based permeable crystalline waterproof coating has high adhesion, high strength, high impermeability, and self-healing, environmental protection, mildew resistance, wear resistance and resistance to base layer changes and other properties. It is applicable to a variety of working conditions. When encountering water, it crystallizes into a rigid waterproof layer. The process is simple and the comprehensive cost is low. The coating thickness is 0.8 - 1.2 MM. After encountering water, a chemical reaction occurs to generate a rigid waterproof layer, which can withstand a water pressure of 2.0 MPa for a long time.

[0021] Furthermore, main drainage channels are provided at the bottom of one side of the tunnel precast invert block body and the rubber pad near the auxiliary drainage channels.

[0022] Furthermore, four symmetrically distributed circular lifting holes are provided at the top of one side of the tunnel precast invert block body. Through the circular lifting holes, it is convenient to lift the tunnel precast invert block body during assembly.

[0023] The tunnel precast invert block waterproof structure solution provided by the present invention has a wide process application range, has the ability to repair micro-cracks and waterproof itself, has high construction efficiency and low comprehensive cost.

[0024] When the tunnel precast invert block waterproof structure solution provided by the present invention is actually applied, it can adapt to a variety of groundwater occurrence conditions, can withstand a water pressure of 2.0 MPa for a long time, and has self-healing ability. After encountering water, it crystallizes to form a rigid waterproof layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the principle of the tunnel precast invert block waterproof structure in Example 1 of the present invention;

[0026] Figure 2 It is a three-dimensional structure schematic diagram of the tunnel precast invert block involved in Example 2 of the present invention;

[0027] Figure 3 In Example 2 of the present inventionFigure 2 Schematic cross-sectional view of the three-dimensional structure;

[0028] Figure 4 In Example 2 of the present invention Figure 3 Front view;

[0029] Figure 5 Schematic diagram of the structure after installation in Example 2 of the present invention;

[0030] Figure 6 In Example 2 of the present invention Figure 5 Schematic diagram of the second form;

[0031] Figure 7 Partial structure disassembly diagram in Example 2 of the present invention.

[0032] In the figure: 1. Tunnel precast invert block body; 2. Adhesive; 3. Waterstop assembly; 301. Flexible waterstop sealant strip; 302. Pouring hole; 303. Elastomer; 4. Porous elastic structure; 401. Honeycomb cavity structure; 5. Auxiliary drainage channel; 6. Main drainage channel; 7. Circular lifting hole; 8. KS permeable self-healing waterproof material; 9. Limiting groove; 10. Rubber pad; 11. Flexible reinforcement mesh; 21. Water-swelling waterstop strip with grouting pipe; 22. KS permeable self-healing waterproof material layer; 31. The Nth precast component; 32. The (N + 1)th precast component; 33. Groove; 34. Back water surface. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Example 1

[0035] In view of the problems existing in the waterproof structure used in the existing tunnel engineering invert precast components, this example provides a new precast invert block waterproof structure to overcome the problems existing in the existing solutions.

[0036] The new precast invert block waterproof structure provided in this example innovatively combines a water-swelling waterstop strip with a grouting pipe and a KS permeable self-healing waterproof material layer to form a waterproof structure.

[0037] As a preferred solution, a low-hardness polyurethane elastomer is also used here to fill the water-swelling waterstop strip with a grouting pipe.

[0038] In the formed combined waterproof structure, the water-swellable waterstop strip with a grouting pipe is adopted to form the first waterproof measure, and a low-hardness polyurethane elastomer is filled. The overall construction is convenient and simple, and the comprehensive cost is relatively low. In case of accidental damage during the construction process, the KS permeable self-healing waterproof material layer constitutes the second waterproof measure. The KS permeable self-healing waterproof material layer generates a rigid waterproof layer when encountering water, thereby being able to supplement and strengthen the first waterproof measure formed by the water-swellable waterstop strip with a grouting pipe.

[0039] This combined waterproof structure can be applied to various working conditions during actual application, with simple technology and relatively low comprehensive cost.

[0040] See Figure 1 , when the new precast invert block waterproof structure given in this example is specifically applied, two waterproof measures are formed based on the solution of this example between the Nth precast member 31 and the (N + 1)th precast member 32 that need to construct the waterproof structure. The specific implementation process is as follows:

[0041] First, construct the first active waterproof measure. Adopt a water-swellable waterstop strip with a grouting pipe and fill it with a low-hardness polyurethane elastomer to make it dense.

[0042] Specifically, lay the water-swellable waterstop strip 21 with a grouting pipe in the reserved groove 33 on the Nth precast member 31 and the (N + 1)th precast member 32. Here, the 401 glue bonding / nail nailing method is preferably used for positioning.

[0043] On this basis, fill the groove 33 for laying the waterstop strip with a low-hardness polyurethane elastomer to make it dense.

[0044] As an example, there are dozens of cross-sections of the waterstop strip here, such as 15×20, 20×20, 20×30, 30×30, 30×40, 20×50, 30×50, 50×50, etc., which can be specifically determined according to actual needs.

[0045] Then, pour the lining / assemble the precast invert block on this basis. The specific implementation process of this step can be determined according to actual needs and will not be elaborated here.

[0046] Finally, construct the second passive waterproof measure. Brush the KS permeable self-healing waterproof material on the back surface 34 of the completed poured lining / assembled precast invert block to form the corresponding KS permeable self-healing waterproof material layer 22. As a preference, the brushing thickness here is 0.8 - 1.2 mm.

[0047] For example, when applying the KS permeable self-healing waterproof material by brushing, first, the back surface 34 of the completed cast-in-place lining / assembled precast inverted arch block is cleaned and wetted for the coating base surface. On this basis, the thick paste-like coating is brushed to the designed thickness, thereby ensuring the performance of the formed KS permeable self-healing waterproof material layer. In this way, the KS permeable self-healing waterproof material layer undergoes a chemical reaction when encountering water, generating a rigid waterproof layer that can withstand a water pressure of 2.0 MPa for a long time.

[0048] The waterproof structure of the precast inverted arch component given in this example can adapt to various groundwater occurrence conditions and can withstand a water pressure of 2.0 MPa for a long time. Moreover, the waterproof structure scheme of the precast inverted arch component given in this example itself has the ability to repair microcracks and waterproof, with high construction efficiency and low comprehensive cost.

[0049] Example 2

[0050] Based on the scheme of Example 1, this example gives a specific application example scheme.

[0051] Please refer to Figures 2 - 7 As shown, the waterproof structure of the tunnel precast inverted arch block given in this example includes two tunnel precast inverted arch block bodies 1 and two bonding parts 2. The shape of the bonding part 2 is trapezoidal, and its bonding surface is made of strong bonding glue. Using this bonding part to preliminarily fix the water stop component 3 and the limiting groove 9 can prevent the water stop component 3 from falling out of the limiting groove 9 due to slight accidental contact during the process of assembling the subsequent tunnel inverted arch block body 1. The opposite sides of the two bonding parts 2 are fixedly connected with a water stop component 3. Limiting grooves 9 are opened on both sides of the precast inverted arch block body 1. Specifically, after the two tunnel precast block bodies 1 are assembled together, the limiting grooves 9 opened on both sides thereof jointly enclose an inverted trapezoid shape adapted to the water stop component 3.

[0052] The water stop component 3 here is a water-swelling water stop strip with a grouting pipe, which includes a flexible water stop sealing strip 301 fixedly connected to the opposite sides of the two bonding parts 2.

[0053] A pouring hole 302 is arranged in the middle of one end of the flexible water stop sealing strip 301, and the pouring hole 302 penetrates from one end of the flexible water stop sealing strip 301 to the other end of the flexible water stop sealing strip 301.

[0054] A porous elastic structure 4 is provided in the area of the flexible water stop sealing strip 301 around the pouring hole 302 along the length direction of the flexible water stop sealing strip 301 to improve the resilience of the flexible water stop sealing strip 301.

[0055] Furthermore, an elastomer 303 is poured into the pouring hole 302. The material of the elastomer 303 is polyurethane. When the elastomer 303 is poured, it is in a fluid state and poured into the pouring hole 302. After it cools down, it forms a cylindrical elastic member fixed to the pouring hole 302. This elastic member is the body of the elastomer 303, which can increase the toughness of the flexible water-stop sealing strip 301, thereby reducing the possibility of the flexible water-stop sealing strip 301 breaking.

[0056] Embodiment 3

[0057] This example gives a specific solution for the porous elastic structure 4 in Example 2.

[0058] As shown in the figure, the porous elastic structure 4 given in this example includes a honeycomb-like cavity structure 401 formed inside the flexible water-stop sealing strip 301.

[0059] Furthermore, the honeycomb-like cavity structure 401 is used to improve the resilience of the flexible water-stop sealing strip 301. The flexible water-stop sealing strip 301 has the property of swelling when encountering water. The volume ratio of the honeycomb-like cavity structure 401 to the volume of the flexible water-stop sealing strip 301 is greater than or equal to 2 / 3, and the number of regular hexagonal cavities in the honeycomb-like cavity structure 401 is greater than or equal to 7. The size of the hexagon can be adjusted according to the elastic requirements of the flexible water-stop sealing strip.

[0060] Optionally, four symmetrically distributed flexible reinforcement meshes 11 are preset near the honeycomb-like cavity structure 401 during the pouring of the flexible water-stop sealing strip 301.

[0061] See Figure 2 And Figure 7 , the flexible reinforcement mesh 11 is woven by glass fiber using the warp and weft weaving method. Multiple grid holes are enclosed by the warp and weft together. The flexible reinforcement mesh 11 can reduce the possibility of the water-stop sealing strip 301 breaking when using the water-stop sealing strip, play a certain strengthening role for the water-stop sealing strip 301, and at the same time, the flexible reinforcement mesh 11 can play a certain connecting role when the water-stop sealing strip 301 cracks at some positions, thereby preventing the water-stop sealing strip 301 from breaking directly.

[0062] In some embodiments of this example, the components of the material of the honeycomb-like cavity structure 401 include the following parts by weight:

[0063]

[0064] The material made using the above formula has excellent aging durability and elasticity, and can improve the service life of the honeycomb cavity structure.

[0065] In some embodiments of the present example, the flexible water stop sealing strip 301 is made of modified CM rubber. The flexible water stop sealing strip 301 made of this material has good mechanical properties such as good tear resistance, wear resistance, and flex resistance. Moreover, it is flame retardant, oil resistant, solvent resistant, ozone resistant, aging resistant, and weather resistant. More importantly, when the external environmental temperature is high or under external force, the water stop has good elasticity and a fast resilience of permanent deformation, and can maintain good sealing performance for a long time. And its viscosity is relatively high, and it can bond and bite more firmly with the "three joints" of the structure. The shape of the flexible water stop sealing strip 301 is an inverted rectangle. The lower surface of the flexible water stop sealing strip 301 is the water-facing surface of the flexible water stop sealing strip 301, and the ratio of the area of its lower surface to the area of its upper surface is 2 / 3. A rubber pad 10 is fixedly connected to the lower surface of the flexible water stop sealing strip 301. Through the rubber pad 10, when installing the tunnel precast invert block body 1, it can prevent the bottoms of the opposite sides of the two invert block bodies 1 from colliding. And due to the common extrusion of the two tunnel invert precast blocks of the rubber body 1, a certain degree of waterproof effect can also be formed, which can further reduce the upward seepage speed and seepage amount of water. Auxiliary drainage channels 5 are provided at the bottoms of the tunnel precast invert block body 1 and one side of the rubber pad 10. KS permeable self-healing waterproof material 8 is coated at the joint of the upper surfaces of the two tunnel precast invert block bodies 1. This kind of cement-based permeable crystalline waterproof coating has high bonding strength, high strength, high impermeability, as well as self-healing, environmental protection, mildew resistance, wear resistance, and resistance to base layer changes and other properties. It is applicable to a variety of working conditions. When encountering water, it crystallizes into a rigid waterproof layer, with simple process and relatively low comprehensive cost. The coating thickness is 0.8 - 1.2 MM. After encountering water, a chemical reaction occurs, generating a rigid waterproof layer that can withstand a water pressure of 2.0 MPa for a long time.

[0066] Main drainage channels 6 are provided at the bottoms of the tunnel precast invert block body 1 and one side of the rubber pad 10 near the auxiliary drainage channels 5. Through the preset main drainage channels 6 and auxiliary drainage channels 5, when there is water in the tunnel, the accumulated water in the tunnel can be drained into these drainage channels through the subsequent leakage troughs provided, so as to keep the environment in the tunnel relatively dry. Four symmetrically distributed circular lifting holes 7 are provided at the top of one side of the tunnel precast invert block body 1. Through these circular lifting holes, it is convenient for the lifting during the assembly of the tunnel precast invert block body 1. When lifting the tunnel precast invert block body 1, the water stop assembly 3 can be first bonded into another limiting groove 9 in the tunnel precast invert block body 1 to be lifted, so as to facilitate the assembly between the subsequent lifted tunnel precast invert block body 1 and the previous tunnel precast invert block body 1.

[0067] Example 4

[0068] After the structures in Example 2 and Example 3 are installed, the tunnel precast invert waterproof structure can be put into normal use.

[0069] In summary, for the waterproof structure of the precast inverted arch block of the tunnel, during use, the staff first bond the flexible water-stop sealing rubber strip 301 into the limit groove 9 in one of the tunnel precast inverted arch block bodies 1 through the bonding member 2, and then snap the limit groove 9 in the other tunnel precast inverted arch block body 1 with the flexible water-stop sealing rubber strip 301. Subsequently, a layer of KS permeable self-healing waterproof material with a thickness of 0.8 - 1.2 mm is applied to the joint on the upper surface of the two tunnel precast inverted arch block bodies 1.

[0070] In this way, when water seeps upward from the joint of the precast inverted arch block body 1 under the inverted arch, the flexible water-stop sealing rubber strip 301 absorbs water and swells. When it absorbs water and swells, the porous elastic structure 4 inside it also absorbs water and swells, thereby making the two sides of the flexible water-stop sealing rubber strip fit more closely with the inner side walls of the limit groove 9.

[0071] And when the flexible water-stop sealing rubber strip cannot completely block the upward penetration of water below, the KS permeable self-healing waterproof material applied to the joint of the precast inverted arch block body 1 reacts chemically when encountering water to produce crystals, and a rigid waterproof layer is formed by the crystals, thereby secondarily blocking the infiltrating water. The rigid crystal layer formed by this material can withstand a maximum water pressure of 2.0 MPa.

[0072] Example 5

[0073] In the above example, the shape of the flexible water-stop sealing rubber strip 301 is an inverted trapezoid. In other examples, the flexible water-stop sealing rubber strip 301 can be equivalently replaced with a shape adapted to the shape of the storage grooves 9 reserved on both sides of the tunnel inverted arch block body 1, such as a flat cuboid and a circular arc body with protrusions, etc.

[0074] Based on the waterproof structure of the tunnel precast inverted arch block formed by the above examples, through the setting of structures such as the water-stop assembly and the porous elastic structure, during use, first bond the water-stop assembly into the limit groove through the bonding member, and then assemble the other tunnel precast inverted arch block body with a limit groove corresponding to the water-stop assembly with the tunnel precast inverted arch block body bonded with the water-stop assembly. Subsequently, a layer of KS permeable self-healing waterproof material is applied to the joint on the upper surface of the combined body. When groundwater passes through the joint of the combined body from bottom to top on the lower surface of the combined body, the flexible water-stop sealing rubber strip in the water-stop assembly absorbs water and swells, so that the flexible water-stop sealing rubber strip fits more closely with the two limit grooves. And due to the setting of the porous elastic structure, the elasticity of the flexible water-stop sealing rubber strip is increased, and the water-stop belt body itself has a certain elastic characteristic, and the subsequent added elastic structure further enhances this elastic characteristic, thereby solving the problem of cracking of the water-stop belt caused by misalignment at some positions during the installation process.

[0075] As described above, it is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention. Terms such as "connection", "installation", "fixation", "setting", etc. are all understood in a broad sense. For example, "connection" can be a fixed connection or indirectly through an intermediate component without affecting the relationship between components and technical effects, or it can be an integral connection or a partial connection. In the same situation as this example, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention or the invention can be understood according to specific circumstances.

Claims

1. A waterproof structure for precast inverted arch blocks of a tunnel, characterized in that, a waterproof structure is formed by combining a water-swelling waterstop strip with a grouting pipe and a KS permeable self-healing waterproof material layer; in the waterproof structure, a low-hardness polyurethane elastomer is used to fill the water-swelling waterstop strip with a grouting pipe; the waterproof structure includes two precast inverted arch block bodies (1) of the tunnel and two bonding members (2). A water-swelling waterstop strip (3) with a grouting pipe is fixedly connected to the opposite sides of the two bonding members (2), and limiting grooves (9) are provided on both sides of the precast inverted arch block body (1); the water-swelling waterstop strip (3) with a grouting pipe includes a flexible waterstop sealant strip (301) fixedly connected to the opposite sides of the two bonding members (2). A pouring hole (302) is provided in the middle of one end of the flexible waterstop sealant strip (301). The pouring hole (302) penetrates from one end of the flexible waterstop sealant strip (301) to the other end of the flexible waterstop sealant strip (301). A porous elastic structure (4) is provided in the flexible waterstop sealant strip (301) in the area around the pouring hole (302) extending along the length direction of the flexible waterstop sealant strip (301) to improve the resilience of the flexible waterstop sealant strip (301), and an elastomer (303) is poured into the pouring hole (302).

2. A waterproof structure for precast inverted arch blocks of a tunnel according to claim 1, characterized in that: the porous elastic structure (4) includes a honeycomb-like cavity structure (401) formed inside the flexible waterstop sealant strip (301).

3. A waterproof structure for precast inverted arch blocks of a tunnel according to claim 2, characterized in that: the volume ratio of the honeycomb-like cavity structure (401) to the volume of the flexible waterstop sealant strip (301) is greater than or equal to 2 / 3, and the number of regular hexagonal cavities in the honeycomb-like cavity structure (401) is greater than or equal to 7.

4. A waterproof structure for precast inverted arch blocks of a tunnel according to claim 3, characterized in that: four flexible strengthening meshes (11) are symmetrically distributed in advance at the position near the honeycomb-like cavity structure (401) in the flexible waterstop sealant strip (301) during pouring.

5. A waterproof structure for precast inverted arch blocks of a tunnel according to claim 4, characterized in that: the flexible waterstop sealant strip (301) is made of modified CM rubber, and the flexible waterstop sealant strip (301) is in an inverted rectangular shape.

6. A waterproof structure for precast inverted arch blocks of a tunnel according to claim 5, characterized in that: a rubber pad (10) is fixedly connected to the lower surface of the flexible waterstop sealant strip (301). Auxiliary drainage channels (5) are provided at the bottom of one side of the precast inverted arch block body (1) and the rubber pad (10). KS permeable self-healing waterproof material (8) is coated at the joint of the upper surfaces of the two precast inverted arch block bodies (1).

7. A waterproof structure for precast inverted arch blocks of a tunnel according to claim 6, characterized in that: A main drainage channel (6) is provided at the bottom near the auxiliary drainage channel (5) on one side of the tunnel precast inverted arch block body (1) and the rubber pad (10).

8. A waterproof structure for a tunnel precast inverted arch block according to claim 7, characterized in that: Four symmetrically distributed circular lifting holes (7) are provided at the top on one side of the tunnel precast inverted arch block body (1).

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