Plugging device and plugging method for flexible layer

Abstract

The invention discloses a plugging device and plugging method for flexible layers in underground structures such as buried heat storage pools, artificial reservoirs and refuse landfills, the plugging device comprises a first clamping piece, a second clamping piece and a third clamping piece, the first clamping piece is arranged on the inner side of the flexible layer after penetrating through an opening of the flexible layer, and the second clamping piece is arranged on the outer side of the flexible layer; the opening is formed on the basis of the gap of the flexible layer, and the size of the opening is larger than that of the gap; the second clamping piece is arranged on the outer side of the flexible layer and is aligned with the first clamping piece; and the connecting piece penetrates through the hole in the second clamping piece and is fixedly connected with the first clamping piece. According to the technical scheme, the structure design of the opening of the flexible layer and the clamping piece is ingenious, and the device is particularly suitable for leakage blocking operation under the condition that only one side of the flexible layer in an underground structure can be reached.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-seepage of underground structures such as buried hot water storage tanks, artificial reservoirs and landfills, and in particular to a flexible layer sealing device and a sealing method. Background Art

[0002] Water leakage poses a serious threat to structural safety and operational stability in various water conservancy, energy, and infrastructure projects, particularly in buried hot water storage tanks, pumped-storage power plants, and rockfill dam systems. Traditional "dry-field construction" approaches require draining the reservoir, which not only impacts operational efficiency and increases economic costs, but also creates significant ecological challenges.

[0003] At present, there are three main types of underwater plugging methods: one is to use robots and sensor equipment to achieve remote leak detection, such as the deep-water leakage detection and repair device proposed in CN208668372U, which completes deep-water autonomous detection and repair through a sonar and repair manipulator integrated system. The second is to use structural plugging methods, such as the panel rockfill dam plugging structure described in CN206693158U, which sets a conduit and a cover plate at the seam, and achieves rapid plugging through grouting and surface reinforcement. The third is a material-based plugging solution, such as CN110984160A (applicant: China Power Construction Kunming Institute), which uses PTN materials and SR anti-seepage cover plates to implement graded plugging and pressurized edge sealing at different crack levels to form a multi-level anti-seepage system.

[0004] While the three aforementioned technologies have, to a certain extent, addressed the challenge of underwater plugging, they still face significant limitations in the following areas: First, most processes are limited to specific structures (e.g., rockfill dams) and are difficult to apply to water-based thermal storage systems with complex structures and irregular interfaces. Second, plugging materials have high requirements for the base layer, making interfacial debonding and plugging failure more likely to occur in humid environments. Third, grouting techniques often rely on high-pressure systems, which pose stability and safety risks during underwater operations. Furthermore, leak detection still requires significant manual effort, resulting in low efficiency and accuracy, and deepwater operations place extremely high demands on construction equipment and personnel.

[0005] Furthermore, CN106836132A integrates multiple steps, including structural cleaning, leak detection, flexible grouting, rubber rod embedding, and composite waterstop cover attachment, into an integrated process. While this process overcomes the bottleneck of single-material or structural sealing, improving adaptability and construction feasibility in complex underwater conditions, it is only suitable for underwater treatment of water seepage in joints of hard materials such as reinforced concrete panels, and is not suitable for underwater treatment of water seepage in non-hard materials.

[0006] Flexible barrier layers are commonly used for anti-seepage in underground structures such as buried hot water storage tanks, artificial reservoirs, and landfills. For example, CN108444326A (Fan Jianhua) discloses a water-soil coupled thermal storage body with a flexible barrier layer. CN108458617A (Fan Jianhua) and CN108455103A (Fan Jianhua) respectively disclose microchannel exhaust and drainage devices and floating insulation cover designs for large-volume hot water storage tanks, and propose methods for using flexible barrier layers. Flexible barrier layers offer the advantages of convenient construction, wide adaptability, and excellent anti-leakage performance. However, long-term operation or external disturbances may cause cracks or perforations. Once a leak occurs, it is difficult to repair, and if not addressed promptly, it may affect the operation of the thermal storage tank or cause groundwater contamination.

[0007] In summary, in underwater environments and cross-seasonal heat storage applications, leakage monitoring and plugging technologies face higher technical requirements and urgently need a threshold. There is an urgent need for efficient, safe, and environmentally friendly solutions that are suitable for underwater operations and facilitate precise positioning and plugging. Summary of the Invention

[0008] The embodiments of the present invention provide a flexible layer blocking device and a blocking method to solve at least one technical problem existing in the prior art.

[0009] According to an embodiment of one aspect of the present invention, a blocking device for a flexible layer is provided, wherein the blocking device for a flexible layer comprises:

[0010] a first clamping member, the first clamping member being arranged on the inner side of the flexible layer after passing through an opening of the flexible layer, the opening being made on the basis of a slit of the flexible layer, and the size of the opening being larger than the size of the slit;

[0011] a second clamping member, the second clamping member being disposed on an outer side of the flexible layer and aligned with the first clamping member;

[0012] A connecting member passes through a hole on the second clamping member and is connected and fixed to the first clamping member.

[0013] In some embodiments, a first flexible gasket is provided between the first clamping member and the flexible layer; and / or,

[0014] A second flexible gasket is further provided between the second clamping member and the flexible layer.

[0015] In some embodiments, the connecting member is a bolt, the number of the bolts is more than two, the hole on the second clamping member is a through hole, and the first clamping member is provided with a threaded blind hole or a threaded through hole at a position corresponding to the through hole.

[0016] In some embodiments, the length of the slit is greater than the width of the slit, and accordingly, the length L1 of the opening is greater than the width W1 of the opening;

[0017] The length L2 of the first clamping member is greater than the length L1 of the opening, the length L1 of the opening is greater than the width W2 of the first clamping member, and the width W2 of the first clamping member is greater than the width W1 of the opening, that is:

[0018] L2>L1>W2>W1.

[0019] In some embodiments, the thickness of the first clamping member is T, and the width W1 of the opening is greater than the thickness, that is,

[0020] W1>T.

[0021] In some embodiments, the first clamping member passes through the opening in a width direction and is placed inside the flexible layer, and then rotated 90 degrees to cover the opening area.

[0022] In some embodiments, the length of the slit has a value range of 0.5-50 cm, and the width of the slit has a value range of 0.2-20 cm.

[0023] In some embodiments, the length L2 of the first clamping member is at least 10 cm greater than the length L1 of the opening;

[0024] The width W2 of the first clamping member is at least 10 cm greater than the width W1 of the opening;

[0025] The length L1 of the opening is greater than the width W2 of the first clamping member, with the difference being 1-5 cm;

[0026] The width W1 of the opening is greater than the thickness T of the first clamping member, with the difference being 1-5 cm.

[0027] In some embodiments, the flexible layer is made of a flexible barrier material, and the flexible barrier material is at least one of the following: polyethylene, polypropylene, polyvinyl chloride, ethylene-vinyl acetate copolymer, butyl rubber, or EPDM rubber.

[0028] In some embodiments, the sealing device of the flexible layer is used for a buried heat storage tank, an artificial reservoir or a landfill, the inner side of the flexible layer includes any one of a covering layer, a structural filler or a foundation cushion layer, and the outer layer of the flexible layer is a sealing operation space, which is a water storage tank body, a water body or an inspection channel.

[0029] According to another aspect of the present invention, a method for sealing a flexible layer is provided, comprising the following steps:

[0030] A rectangular maintenance opening is opened on the flexible layer along the direction of the leakage gap, wherein the length L1 of the opening is greater than the length of the gap, and the width W1 of the opening is greater than the width of the gap;

[0031] Prepare or take out a pre-prepared first clamping member and a second clamping member, wherein the length L2 of the first clamping member is greater than the length L1 of the opening, and the width W2 of the first clamping member is less than the length L1 of the opening;

[0032] Insert the first clamping member through the opening and under the flexible layer, rotate it 90 degrees to align it with the leakage area, adjust the position of the first clamping member until it completely covers the opening, and then align the second clamping member with the first clamping member on the flexible layer;

[0033] The second clamping member, the flexible layer and the first clamping member are fitted and fixed together through the reserved hole and the connecting member to complete the sealing operation.

[0034] In some embodiments, a flexible gasket is further fixedly provided on a side of the first clamping member and / or the second clamping member close to the flexible layer.

[0035] In some embodiments, the method further comprises:

[0036] Before opening a rectangular or quasi-rectangular inspection opening, spray a colored solvent on the suspected leaking area of ​​the flexible layer and observe the flow trend of the colored solvent to determine whether there is a leak and the location of the leak; and / or,

[0037] After locating the leak, clean the surface of the flexible layer around the leak to remove sediment and foreign matter, and make the opening area flat to facilitate subsequent plugging; and / or,

[0038] After the plugging operation is completed, spray a colored solvent to detect whether there is still leakage and confirm the integrity of the plugging and sealing.

[0039] Compared with the prior art, the embodiments of the present invention have the following features and advantages:

[0040] The above technical solution gives full play to the detachable, penetrable and reconfigurable characteristics of the clamping structure, and achieves efficient sealing in an asymmetric environment through local opening and overall compression.

[0041] At the same time, combined with measures such as flexible gaskets, size optimization, and prefabricated hole layout, the overall sealing performance and operational convenience are greatly improved.

[0042] Therefore, the above technical solution not only improves the underwater plugging efficiency, but also provides a safe, stable and universal solution for the long-term maintenance of the flexible (barrier) layer under "one-side operable" conditions.

[0043] Specifically, the following advantages are obtained:

[0044] The plugging is intuitive and easy to operate, without the need for complex instruments;

[0045] The structural design of the clamping parts is reasonable, which facilitates rapid sealing and has strong sealing performance;

[0046] The materials used are environmentally friendly and corrosion-resistant, suitable for long-term underwater service;

[0047] The entire process can be completed underwater by manual or robotic operation, without the need to drain reservoirs, heat storage tanks, etc., thus saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a schematic structural diagram of a gap in a flexible layer provided by some embodiments of the present invention;

[0049] Figure 2 is a schematic structural diagram of a clamping member provided in some embodiments of the present invention;

[0050] Figure 3 is a schematic structural diagram of a flexible layer blocking device provided by some embodiments of the present invention;

[0051] Figure 4 It is a schematic flow chart of a flexible layer sealing method provided in some embodiments of the present invention.

[0052] Description of the accompanying drawings:

[0053] 1. Gaps in the flexible layer;

[0054] 2. Opening of the flexible layer;

[0055] 3. Second clamping member;

[0056] 4. a second flexible gasket of the second clamping member;

[0057] 5. a first flexible gasket of the first clamping member;

[0058] 6. First clamping member;

[0059] 7. Connectors;

[0060] 8. Flexible layer;

[0061] 9. Hole. DETAILED DESCRIPTION

[0062] The following description sets forth numerous specific details to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific implementations disclosed below.

[0063] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, inside, outside, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0064] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0065] In the description of the present invention, reference to terms such as "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention.

[0066] See also Figure 1-3 As shown, an embodiment of the present invention discloses a plugging device for a flexible layer, comprising:

[0067] A first clamping member 6, which is arranged on the inner side of the flexible layer after passing through the opening 2 of the flexible layer 8, the opening being made on the basis of the slit 1 of the flexible layer, and the size of the opening being slightly larger than the size of the slit;

[0068] a second clamping member 3, which is disposed on the outside of the flexible layer and aligned with the first clamping member;

[0069] A connecting member 7 is passed through a hole in the second clamping member and is connected and fixed to the first clamping member.

[0070] In some optional embodiments, a first flexible gasket 5 is provided between the first clamping member and the flexible layer;

[0071] A second flexible gasket 4 is further provided between the second clamping member 3 and the flexible layer 8 .

[0072] In some optional embodiments, the connecting member 7 is a bolt, the number of the bolts is more than two, the hole on the second clamping member is a through hole 9, and the first clamping member is provided with a threaded blind hole or a threaded through hole 9 at a position corresponding to the through hole.

[0073] In some embodiments, the length of the slit 1 is greater than the width of the slit 1 , and correspondingly, the length L1 of the opening 2 is greater than the width W1 of the opening 2 ;

[0074] The length L2 of the first clamping member 6 is greater than the length L1 of the opening, the length L1 of the opening 2 is greater than the width W2 of the first clamping member 6, and the width W2 of the first clamping member 6 is greater than the width W1 of the opening, that is:

[0075] L2>L1>W2>W1.

[0076] Furthermore, the thickness of the first clamping member 6 is T, and the width W1 of the opening 2 is greater than the thickness, that is,

[0077] W1>T.

[0078] In some embodiments, the first clamping member passes through the opening in its width direction and is placed inside the flexible layer 8 , and then rotated 90 degrees to cover the opening area.

[0079] In some optional embodiments, the numerical range of the gap length is 0.5-50 cm, and the numerical range of the gap width is 0.2-20 cm.

[0080] Furthermore, the length L2 of the first clamping member is at least 10 cm greater than the length L1 of the opening;

[0081] The width W2 of the first clamping member is at least 10 cm greater than the width W1 of the opening;

[0082] The length L1 of the opening is greater than the width W2 of the first clamping member, with the difference being 1-5 cm;

[0083] The width W1 of the opening is greater than the thickness T of the first clamping member, with the difference being 1-5 cm.

[0084] In some embodiments, the flexible layer is made of a flexible barrier material, and the flexible barrier material is at least one of the following: polyethylene, polypropylene, polyvinyl chloride, ethylene-vinyl acetate copolymer, butyl rubber, or EPDM rubber.

[0085] In some embodiments, the sealing device of the flexible layer is used for a buried heat storage tank, an artificial reservoir or a landfill, the inner side of the flexible layer includes any one of a covering layer, a structural filler or a foundation cushion layer, and the outer layer of the flexible layer is a sealing operation space, which is a water storage tank body, a water body or an inspection channel.

[0086] Combine Figure 4 As shown, the operation steps of the embodiment of the present invention include:

[0087] Step S100: A rectangular or quasi-rectangular maintenance opening 2 is opened on the flexible layer along the direction of the leakage gap 1, wherein the length L1 of the opening 2 is slightly greater than the length of the gap 1, and the width W1 of the opening 2 is slightly greater than the width of the gap 1;

[0088] Step S200: preparing a first clamping member 6 and a second clamping member 3, wherein the length L2 of the first clamping member 6 is greater than the length L1 of the opening 2, and the width W2 of the first clamping member 6 is less than the length L1 of the opening;

[0089] Step S300: insert the first clamping member 6 through the opening 2 and under the flexible layer 8, rotate it 90 degrees to align it with the leakage area, adjust the position of the first clamping member 6 until it completely covers the opening 2, and then align the second clamping member 3 with the first clamping member 6 on the flexible layer 8;

[0090] Step S400: The second clamping member 3, the flexible layer 8 and the first clamping member 6 are attached and fixed together through the reserved hole and the connecting member 7 to complete the blocking operation.

[0091] In order to overcome the technical defects of the existing technology, after continuous research and testing, this embodiment provides an underwater leak detection and plugging process for a buried heat storage pool with a flexible barrier layer that is accessible on one side and has a reasonable structure, is safe, environmentally friendly, and easy to implement.

[0092] In some optional embodiments, a flexible gasket (4, 5) is further fixedly provided on a side of the first clamping member 6 and / or the second clamping member 3 close to the flexible layer 8.

[0093] In some optional embodiments, the method further includes:

[0094] Before opening a rectangular inspection opening, spray a colored solvent on the suspected leak area of ​​the flexible layer and observe the flow trend of the colored solvent to determine whether there is a leak and the leak location;

[0095] After locating the leak, clean the surface of the flexible layer around the leak to remove sediment and foreign matter, making the opening area flat for subsequent plugging.

[0096] After the plugging operation is completed, spray a colored solvent to detect whether there is still leakage and confirm the integrity of the plugging and sealing.

[0097] Preferred embodiment

[0098] The flexible (barrier) layer in this embodiment is made of a flexible barrier material, preferably polyethylene (PE) or polypropylene (PP), which exhibits excellent ductility, corrosion resistance, and impermeability. However, the present invention is also applicable to other flexible impermeable materials, such as polyvinyl chloride (PVC), ethylene-vinyl acetate copolymer (EVA), butyl rubber, and ethylene propylene diene monomer (EPDM). The selection of other flexible barrier materials can be tailored to the specific project requirements.

[0099] The length of the cracks to be sealed generally ranges from 0.5 to 50 cm, and the width generally ranges from 0.5 to 20 cm. The sealing structure of the present invention is primarily suitable for linear cracks (such as longitudinal cracks and shear cracks) where the length is greater than the width, but is not limited to these. For cracks of irregular sizes, good sealing effects can also be achieved by properly setting the opening size and the shape of the splint.

[0100] In terms of opening design, the length L1 of the flexible barrier layer opening should be greater than the width W1 of the opening, and the difference between the two should be at least 10 cm. This design ensures the integrity of the splint installation space and the sealing area.

[0101] The dimensions of the splint must meet the following relationship to ensure structural strength and sealing effect:

[0102] L2>L1>W2>W1>T

[0103] The length of the splint L2 should be at least 10 cm greater than the length of the opening L1;

[0104] The width of the splint W2 should be at least 10 cm greater than the opening width W1;

[0105] The opening length L1 should be greater than the splint width W2, but the difference between the two is generally 1-5 cm;

[0106] The opening width W1 should be greater than the plywood thickness T, but the difference between the two is generally 1-5 cm;

[0107] The logic behind the above size matching is to improve the tensile strength and prevent the sealing structure from slipping or shifting while ensuring the clamping area, while leaving enough margin to cope with positioning errors and deformation during underwater operations.

[0108] The upper plate features multiple prefabricated, through-hole screw holes, which are straight-through holes without internal threads. The lower plate has corresponding non-through-hole screw holes with pre-threaded internal threads, creating a secure fit. During installation, workers or divers insert bolts from the upper plate through the flexible barrier layer and then through the screw holes in the lower plate, completing the assembly. The number and arrangement of bolts can be adjusted flexibly based on the plate size and structural requirements.

[0109] In order to improve operational convenience and underwater positioning efficiency, hook threads can be prefabricated between some of the splint thread holes for temporary hanging, lifting, guide positioning or auxiliary operation tool fixation, effectively improving construction efficiency and safety.

[0110] The process comprises the following steps:

[0111] Underwater leak detection

[0112] Evenly spray a colored solvent (such as a water-dispersible dye) near the suspected leak area of ​​the flexible barrier layer and observe the solvent flow to determine the presence and location of the leak. This method is suitable for underwater environments, is non-toxic and environmentally friendly, and poses no risk to construction workers.

[0113] Surface treatment of flexible barrier layer

[0114] After locating the leak point, clean the surface of the flexible barrier layer around the leak to remove sediment and foreign matter, making the opening area flat for subsequent sealing.

[0115] Opening pretreatment

[0116] A rectangular inspection opening is opened on the flexible barrier layer along the direction of the leakage gap. The opening length L1 should be slightly larger than the gap length, and the opening width W1 should be slightly larger than the gap width, where L1>W1.

[0117] Splint component processing

[0118] Prepare a pair of rigid clamping plate assemblies, including an upper clamping plate and a lower clamping plate, both made of corrosion-resistant materials. The clamping plate length L2 should be greater than the opening length L1, the width W2 should be less than the opening length L1, and the thickness T should be less than the opening width W1. Flexible sealing gaskets are fixed to the inner surfaces of each clamping plate. The clamping plates are secured with multiple bolts, with the bolt spacing plus the bolt diameter less than W1. Bolt holes are prefabricated in the clamping plates, and the number and arrangement of bolt holes can be adjusted based on the actual opening size.

[0119] Plugging operation

[0120] Insert the lower clamping plate with a flexible gasket through the opening and under the flexible barrier layer. Rotate it 90° to align it with the leaking area. Adjust the lower clamping plate until it completely covers the opening. Assemble the upper clamping plate in alignment with the lower clamping plate on the flexible barrier layer. The flexible gasket should be in close contact with the barrier layer to provide a leak-proof seal. Then, insert the bolts and tighten them sequentially to secure the upper and lower clamping plates together. The seal is now sealed.

[0121] Seal Verification

[0122] Spray the colored solvent again to check for leakage and confirm the integrity of the seal. If there is no leakage of dye, the seal is considered successful.

[0123] The underwater leak detection and plugging process of the present invention is safe and efficient, and has the following advantages:

[0124] The leak detection method is intuitive and easy to operate, without the need for complex instruments;

[0125] The plywood assembly has a reasonable structural design, which is convenient for rapid sealing and has strong sealing performance;

[0126] The materials used are environmentally friendly and corrosion-resistant, suitable for long-term underwater service;

[0127] The entire process can be completed underwater manually or by robot operation, without draining the heat storage tank, thus saving costs.

[0128] The barrier layer opening and clamping structure described in this invention are ingeniously designed and are particularly suitable for leak sealing operations in underground structures where only one side of the flexible barrier layer is accessible. This often occurs when one side of the flexible barrier layer is accessible (such as a reservoir, water body, or inspection access), while the other side is an inaccessible area (such as an overburden layer, structural fill, or foundation cushion). Under such conditions, traditional double-sided or grouting-based sealing methods are difficult to implement. The single-sided, through-and-clamping sealing technology provided by this invention effectively addresses this technical bottleneck.

[0129] Specifically, the barrier layer opening is located on the accessible side. The lower plywood is inserted through this opening into the back of the flexible barrier layer and, through a 90-degree rotation, unfolds and covers the opening, forming a preliminary closure. The upper plywood is then installed from the outside and fastened to the lower plywood with embedded screw holes using bolts. This ensures that the upper and lower plywood exert stable pressure on the flexible barrier layer, effectively clamping it and forming a seal.

[0130] This structure is not only suitable for flexible barrier layer repair scenarios in underwater environments, but also because it only requires single-sided operation and the splints can be inserted and deployed, it is particularly suitable for the following complex underground environments:

[0131] The inner side of the flexible anti-seepage layer is a water storage medium, and the outer side is a natural stratum that cannot be removed or disturbed;

[0132] One side can be operated manually or mechanically, while the other side is restricted by soil, concrete or other irregular structures;

[0133] Limited construction space or demanding conditions where disturbance and excavation must be minimized.

[0134] This design fully leverages the detachable, insertable, and reconfigurable characteristics of the splint structure. By utilizing partial openings and overall compression, it achieves efficient sealing in asymmetric environments. Furthermore, combined with flexible gaskets, optimized dimensions, and prefabricated hole placement, it significantly enhances overall sealing performance and operational convenience.

[0135] Therefore, the present invention not only improves the underwater plugging efficiency, but also provides a safe, stable and universal solution for the long-term maintenance of the flexible barrier layer under the "one-side operable" condition.

[0136] It should be noted that although the present invention is disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A plugging device for a flexible layer, characterized in that: The blocking device of the flexible layer comprises: a first clamping member, the first clamping member being arranged on the inner side of the flexible layer after passing through an opening of the flexible layer, the opening being made on the basis of a slit of the flexible layer, and the size of the opening being larger than the size of the slit; a second clamping member, the second clamping member being disposed on an outer side of the flexible layer and aligned with the first clamping member; A connecting piece is passed through a hole on the second clamping piece and is connected and fixed to the first clamping piece.

2. The flexible layer blocking device according to claim 1, characterized in that: A first flexible gasket is provided between the first clamping member and the flexible layer; and / or, A second flexible gasket is further provided between the second clamping member and the flexible layer.

3. The flexible layer blocking device according to claim 1, characterized in that: The connecting member is a bolt, the number of the bolts is more than two, the hole on the second clamping member is a through hole, and the first clamping member is provided with a threaded blind hole or a threaded through hole at a position corresponding to the through hole.

4. The flexible layer blocking device according to any one of claims 1 to 3, characterized in that: The length of the slit is greater than the width of the slit, and correspondingly, the length L1 of the opening is greater than the width W1 of the opening; The length L2 of the first clamping member is greater than the length L1 of the opening, the length L1 of the opening is greater than the width W2 of the first clamping member, and the width W2 of the first clamping member is greater than the width W1 of the opening, that is: L2>L1>W2>W1.

5. The flexible layer blocking device according to claim 4, characterized in that: The thickness of the first clamping member is T, and the width W1 of the opening is greater than the thickness, that is: W1>T.

6. The flexible layer blocking device according to claim 5, characterized in that: The first clamping member passes through the opening in a width direction and is placed inside the flexible layer, and then rotated 90 degrees to cover the opening area.

7. The flexible layer blocking device according to claim 4, characterized in that: The numerical range of the gap length is 0.5-50 cm, and the numerical range of the gap width is 0.2-20 cm; The length L2 of the first clamping member is at least 10 cm greater than the length L1 of the opening; The width W2 of the first clamping member is at least 10 cm greater than the width W1 of the opening; The length L1 of the opening is greater than the width W2 of the first clamping member, with the difference being 1-5 cm; The width W1 of the opening is greater than the thickness T of the first clamping member, with the difference being 1-5 cm.

8. A method for sealing a flexible layer, characterized in that: The steps include: A rectangular maintenance opening is opened on the flexible layer along the direction of the leakage gap, wherein the length L1 of the opening is greater than the length of the gap, and the width W1 of the opening is greater than the width of the gap; Prepare a first clamping member and a second clamping member, wherein the length L2 of the first clamping member is greater than the length L1 of the opening, and the width W2 of the first clamping member is less than the length L1 of the opening; Insert the first clamping member through the opening and under the flexible layer, rotate it 90 degrees to align it with the leakage area, adjust the position of the first clamping member until it completely covers the opening, and then align the second clamping member with the first clamping member on the flexible layer; The second clamping member, the flexible layer and the first clamping member are fitted and fixed together through the reserved hole and the connecting member to complete the sealing operation.

9. The method for sealing the flexible layer according to claim 8, characterized in that: A flexible gasket is also fixedly provided on one side of the first clamping member and / or the second clamping member close to the flexible layer.

10. The method for sealing the flexible layer according to claim 8, characterized in that: The method further comprises: Before opening a rectangular or quasi-rectangular inspection opening, spray a colored solvent on the suspected leaking area of ​​the flexible layer and observe the flow trend of the colored solvent to determine whether there is a leak and the location of the leak; and / or, After locating the leak, clean the surface of the flexible layer around the leak to remove sediment and foreign matter, and make the opening area flat to facilitate subsequent plugging; and / or, After the plugging operation is completed, spray a colored solvent to detect whether there is still leakage and confirm the integrity of the plugging and sealing.

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