Compressed air reservoir structure and construction method

Abstract

The invention discloses a compressed air storage cavern structure and a construction method, solves the problem that in the prior art, a single flexible sealing material is poor in sealing capacity and buffering capacity, and has the beneficial effects that the buffering capacity is high, and the sealing performance of the storage cavern structure is guaranteed. A primary support, a waterproof layer, a secondary lining and a sealing layer are sequentially arranged from outside to inside in the radial direction of the storage cavern structure, the sealing layer comprises a main sealing layer and a secondary sealing layer, the secondary sealing layer is arranged between the main sealing layer and the secondary lining, the secondary lining forms a rigid base body, the main sealing layer forms a flexible sealing layer through a macromolecule resin coating, and the flexible sealing layer is arranged between the main sealing layer and the secondary lining. A groove is formed in the inner surface of the secondary lining, the groove of the secondary lining is filled with the secondary sealing layer, and the secondary sealing layer has elasticity to absorb and disperse stress caused by vibration so as to protect the secondary lining and the main sealing layer.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a compressed air storage structure and a construction method thereof. Background Art

[0002] The statements in this part only provide background technical information related to the present invention, and do not necessarily constitute prior art.

[0003] With the rapid development of renewable energy, compressed air energy storage technology (CAES) has received extensive attention as a new energy storage method. Traditional compressed air energy storage systems generally adopt a composite sealing structure of steel plates and concrete, but a series of fundamental defects have been exposed during long-term high-pressure cyclic operation: fatigue cracks are likely to occur at the steel plate welds to form leakage channels, the electrochemical corrosion of steel caused by the underground humid environment significantly shortens the service life, and the interface peeling failure occurs due to the difference in thermal expansion coefficients between metal and concrete.

[0004] In existing improvement schemes, the internal steel plates are replaced with flexible sealing layers, that is, the lining structure mainly relies on a single flexible sealing material inside. Although the single flexible sealing material can relieve the problem of stress concentration, there is a problem of insufficient sealing performance. Once the sealing material of this layer is damaged, the high-pressure gas directly impacts the lining structure, accelerating the failure of the lining structure. Moreover, during the charging and discharging process, the air pressure changes greatly, or when there is vibration during the operation of the storage, large stresses are generated, and there are no structural components for buffering, which is likely to cause the failure of the storage structure.

[0005] In addition, if the existing lining structure adopts a pure rigid concrete structure, the pure rigid concrete structure will generate irreversible microcracks under cyclic loads due to its brittle characteristics. If conventional composite materials are used, due to insufficient interlayer bonding strength and lack of dynamic adaptation mechanism of the conventional composite materials, it is difficult to cope with the repeated deformation impacts during the charging and discharging process. Especially under the high-pressure difference alternating working conditions, the sealing interface is prone to shear failure, and the airtightness deteriorates exponentially with the increase of the number of cycles.

[0006] The existence of the above problems seriously restricts the long-term reliable operation of the gas storage system under wide temperature range and high-frequency working conditions. Summary of the Invention

[0007] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a compressed air storage structure that can form a new sealing system with dynamic stiffness response and interface collaborative anti-seepage.

[0008] To achieve the above purpose, the present invention is realized by the following technical solutions:

[0009] A compressed air storage structure, including along the radial direction of the storage structure, from the outside to the inside, including the primary support, waterproof layer, secondary lining, and sealing layer arranged in sequence. The sealing layer includes a main sealing layer and a secondary sealing layer. The secondary sealing layer is arranged between the main sealing layer and the secondary lining. The secondary lining forms a rigid matrix. The main sealing layer uses a polymer resin coating to form a flexible sealing layer. There are grooves on the inner surface of the secondary lining. The secondary sealing layer fills the grooves of the secondary lining. The secondary sealing layer has elasticity to absorb and disperse the stress caused by vibration to protect the secondary lining and the main sealing layer.

[0010] For a compressed air storage structure as described above, a plurality of the above-mentioned grooves are arranged along the inner surface of the secondary lining. The distance between adjacent two grooves is the same or different, and the length directions of the grooves are different.

[0011] For a compressed air storage structure as described above, the secondary sealing layer includes a honeycomb layer. A plurality of honeycomb protrusions are arranged on one side of the honeycomb layer facing the secondary lining. The honeycomb protrusions are clamped into the grooves of the secondary lining, and the honeycomb protrusions correspond to the grooves one by one.

[0012] For a compressed air storage structure as described above, from the bottom of the groove to the opening of the groove, the size of the groove gradually decreases so that the secondary sealing layer remains stable after being clamped in.

[0013] For a compressed air storage structure as described above, the secondary lining uses fiber-modified concrete, and the primary support uses sprayed steel fiber concrete.

[0014] For a compressed air storage structure as described above, the main sealing layer uses an epoxy resin coating. The epoxy resin coating selects a spray-type epoxy resin coating, and the epoxy resin coating is added with a microcapsule slow-release repair agent.

[0015] For a compressed air storage structure as described above, a wet and temperature sensor is also arranged between the waterproof layer and the secondary lining. The wet and temperature sensor is respectively connected to a controller, and the controller is connected to an alarm.

[0016] For a compressed air storage structure as described above, the initial support, waterproof layer, secondary lining, and sealing layer are also arranged in sequence at both ends of the storage structure. A sealing plug is arranged at one section of the storage structure, and the air supply pipeline passes through the sealing plug;

[0017] One end of the sealing plug away from the storage structure is a spindle-shaped cylinder, and the maximum height of the spindle-shaped cylinder is less than the height of the storage structure.

[0018] In the second aspect, the present invention also discloses a construction method of a compressed air storage structure, including the following contents:

[0019] Construct the primary support inside the surrounding rock;

[0020] Lay a waterproof layer on the inner surface of the primary support;

[0021] Construct the secondary lining along the inner surface of the waterproof layer. A convex part is provided on the side of the formwork of the secondary lining away from the center point of the storage structure, so that multiple grooves are formed after the secondary lining is formed;

[0022] Spray the same polymer resin coating as the main sealing layer into the grooves of the secondary lining in advance;

[0023] A secondary sealing layer is arranged along the inner surface of the secondary lining, and the secondary sealing layer fills the grooves of the secondary lining;

[0024] Spray a polymer resin coating along the inner surface of the secondary sealing layer to form the main sealing layer.

[0025] A construction method of a compressed air storage structure as described above includes the following contents:

[0026] Before the primary support construction, first judge the integrity of the surrounding rock of the storage structure. If it is intact, carry out the primary support. If there is a fracture zone in the surrounding rock and the length ratio of the fracture zone is greater than the set value or the permeability of the surrounding rock is greater than the set value, it is necessary to grout and reinforce the surrounding rock.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1) In the storage structure of the present invention, the structure is reasonably arranged, including the primary support, waterproof layer, secondary lining and sealing layer arranged in sequence from outside to inside. The sealing layer has two layers, one is the main sealing layer and the other is the secondary sealing layer. The secondary sealing layer can fill the grooves of the secondary lining to ensure the stability of the secondary sealing layer. The main sealing layer and the secondary sealing layer cooperate with each other to improve the sealing performance of the storage structure. Even if the main sealing layer is damaged, the secondary sealing layer can still play an internal sealing role; the secondary sealing layer has elasticity, so during the inflation and deflation process or vibration, it plays a buffering role and can effectively absorb and disperse the stress caused by air pressure changes or structural vibrations, thereby protecting the main sealing layer and the secondary lining, and thus ensuring the sealing performance and service life of the entire storage structure.

[0029] 2) Multiple grooves are provided on the inner surface of the secondary lining of the present invention, and the length directions of the grooves are different. After the secondary sealing layer is stuck into the grooves, it can effectively absorb vibrations in all directions and improve the ability of the internal sealing layer of the secondary lining to cope with stresses in all directions.

[0030] 3) In the present invention, the secondary sealing layer is a honeycomb layer. Multiple honeycomb protrusions are provided on one side of the honeycomb layer, and the honeycomb protrusions are snapped into the grooves. The honeycomb layer has excellent compression characteristics and can effectively absorb and disperse the stress caused by air pressure changes or structural vibrations. The honeycomb protrusions fill the grooves of the secondary lining, enabling the honeycomb layer to closely fit the inner wall of the secondary lining and ensuring uniform stress on the secondary sealing layer, thus avoiding damage caused by excessive local stress. Under the action of the secondary sealing layer, the tiny cracks and voids between the secondary lining and the primary sealing layer can be filled, further improving the sealing performance and preventing gas leakage. The resilience of the honeycomb layer can automatically provide a resilience force when the primary sealing layer undergoes slight deformation or cracks, contributing to the self-repair of the primary sealing layer, thereby avoiding further expansion of cracks or gas leakage.

[0031] 4) In the present invention, the secondary lining adopts fiber-modified concrete. Through fiber composite modification, the concrete will have a significant improvement in terms of tensile and compressive strength, airtightness, etc., and can meet the airtightness and strength requirements of the storage structure. At the same time, due to the introduction of flexible fibers, the flexibility of the concrete is greatly improved, and it can resist the cyclic deformation damage caused by the charging and discharging cycle.

[0032] 5) In the present invention, the primary sealing layer adopts a polymer resin coating, and the secondary lining adopts a rigid matrix of fiber-modified concrete. An elastic secondary sealing layer is also provided between the primary sealing layer and the secondary lining, thus forming a "rigid-flexible combination" sealing structure form. The rigid secondary lining undertakes the main compressive stress, and the flexible component absorbs the cyclic deformation energy, solving the problem of interfacial peeling caused by the difference in thermal expansion coefficients between metal and concrete. The inner polymer resin coating can bear a part of the force when the secondary lining cracks, prevent the secondary lining from further cracking, and at the same time undertake the gas sealing problem of the cracked part. During the inflation stage, the micro-expansion effect is realized through the flexible sealing layer to ensure the integrity of the seal. During the deflation stage, the rigid matrix provides a stable pressing support, thereby effectively suppressing gas penetration. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The schematic diagram of the accompanying drawings forming a part of the present invention is used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0034] Figure 1 FIG. is a schematic longitudinal sectional view of a compressed air storage structure according to one or more embodiments of the present invention.

[0035] Figure 2 FIG. is a sectional view of a compressed air storage structure according to one or more embodiments of the present invention.

[0036] Figure 3It is a sectional view of the secondary sealing layer in a compressed air storage structure according to one or more embodiments of the present invention.

[0037] Figure 4 It is a schematic diagram showing the cooperation between the secondary sealing layer and the secondary lining in a compressed air storage structure according to one or more embodiments of the present invention.

[0038] In the figure: The distances or dimensions between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration.

[0039] Wherein: 1. Main sealing layer; 2. Secondary sealing layer; 21. Honeycomb protrusion; 3. Secondary lining; 4. Waterproof layer; 5. Initial support; 6. Surrounding rock; 7. Sealing plug. Specific embodiments

[0040] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the present invention clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof;

[0042] As introduced in the background art, the problem of poor sealing ability and buffering ability of a single flexible sealing material in the prior art. To solve the above technical problems, the present invention proposes a compressed air storage structure.

[0043] Embodiment 1

[0044] In a typical embodiment of the present invention, referring to Figure 1 As shown, in a compressed air storage structure, along the radial direction of the storage structure, from the outside to the inside, there are successively arranged an initial support 5, a waterproof layer 4, a secondary lining 3 and a sealing layer. The sealing layer includes a main sealing layer 1 and a secondary sealing layer 2. The main sealing layer 1 is inside, and the secondary sealing layer 2 is arranged close to the secondary lining 3. There are grooves on the inner surface of the secondary lining 3, and the secondary sealing layer 2 fills the grooves of the secondary lining 3. The secondary sealing layer 2 has elasticity to absorb and disperse the stress caused by vibration to protect the secondary lining 3 and the main sealing layer 1.

[0045] In this embodiment, the secondary sealing layer 2 is a honeycomb layer. The honeycomb layer is an annular member, which is arranged to fit the inner surface of the secondary lining 3. A plurality of honeycomb protrusions 21 are arranged on the side of the honeycomb layer facing the secondary lining 3. The honeycomb protrusions are inserted into the grooves of the secondary lining 3, and the honeycomb protrusions 21 correspond to the grooves one by one. The honeycomb layer has excellent compression characteristics and can effectively absorb and disperse the stress caused by air pressure changes or structural vibrations, thereby protecting the main sealing layer and the secondary lining. Under the compression of the honeycomb layer, the micro-cracks and voids between the main sealing layer 1 and the secondary lining 3 can be filled, further improving the sealing performance and preventing gas leakage. The elastic resilience of the honeycomb layer can automatically provide resilience when the sealing layer is slightly deformed or cracked, which helps the main sealing layer to self-repair, thus avoiding the further expansion of cracks or gas leakage; the material of the honeycomb layer is the same (or compatible) as that of the main sealing layer, and it has good flexibility and interface bonding ability, and can deform synchronously with the main sealing layer 1 when the structure is stressed, thus avoiding tearing or delamination caused by the difference between rigid and flexible material interfaces.

[0046] It is easy to understand that a plurality of grooves are provided along the inner surface of the secondary lining 3. The distances between adjacent grooves are the same or different, and the length directions of the grooves are different. After the secondary sealing layer 2 is inserted into the grooves, it can effectively absorb vibrations in all directions and improve the ability of the inner sealing layer of the secondary lining 3 to cope with stresses in all directions. In some examples, from the bottom of the groove to the opening of the groove, the size of the groove gradually decreases. Since the honeycomb protrusions can be compressed and inserted into the grooves, the change in the size of the grooves makes the honeycomb protrusions of the secondary sealing layer remain stable after being inserted into the grooves and not easily separated from the grooves.

[0047] It should be noted that the main sealing layer 1 is made of a polymer resin coating, and the secondary lining 3 is a rigid structure. After multiple cycles of charging and discharging, it is easy to crack. The inner polymer resin coating can bear part of the force when the secondary lining 3 cracks, prevent the secondary lining 3 from further cracking, and at the same time bear the gas sealing of the cracked part; specifically, the polymer resin coating uses an epoxy resin coating. Using an epoxy resin coating for sealing avoids the defects of weld leakage and metal electrochemical corrosion existing in using a steel plate for sealing. Moreover, the epoxy resin coating is modified by nano materials (such as nano silicone, organic clay, graphene oxide, etc.) to enhance the interface bonding ability and flexibility with the secondary lining 3. After the polymer resin coating is modified, the bonding strength is enhanced, and the bonding ability with the concrete interface of the secondary lining 3 is enhanced. Therefore, the secondary sealing layer is directly combined with the concrete lining, eliminating the complex operation of secondary bonding and reducing the risk of interface delamination;

[0048] In this embodiment, the epoxy resin coating can be a sprayable epoxy resin paint, which is used for in-situ manual repair of larger ruptured parts; an existing microcapsule sustained-release repair agent is added to the epoxy resin paint. The microcapsule sustained-release repair agent can automatically release its content when the main sealing layer cracks and the epoxy resin coating is stressed (the secondary sealing layer rebounds against the main sealing layer to stress the epoxy resin coating) to generate microcracks, repair the microcracks, and avoid further structural damage and the problem of enhanced permeability caused by microcracks.

[0049] Aiming at the problem of sealing layer cracking in the prior art, a sprayable polymer resin paint is used to repair the ruptured weak parts in-situ and fix the leakage points, solving the problem that the traditional sealing layer needs to be removed and repaired in a large area after being damaged, and saving the maintenance cost.

[0050] It should be noted that the secondary sealing layer 2 is located inside the secondary lining 3 and uses compressible polymer honeycomb protrusions, which have both sealing and energy absorption functions. The honeycomb protrusions 21 have excellent compression characteristics and can effectively absorb and disperse the stress caused by air pressure changes or structural vibrations, thereby protecting the main sealing layer 1 and the secondary lining 3. In addition, the setting of the honeycomb protrusions 21 can reconcile and disperse the stress, and its action mechanism is as follows: the polymer honeycomb structure has compressibility and elasticity. When the structure deforms due to air pressure fluctuations or thermal expansion and contraction, the honeycomb protrusions 21 can buffer such deformations, absorb part of the energy through their own deformation, and reduce the stress; after the honeycomb protrusions 21 are embedded in the grooves, it is equivalent to converting the original geometric discontinuity into a functional filling area, restoring a certain continuity in the structure, which helps to slow down the edge stress concentration.

[0051] In some examples, the secondary sealing layer 2 is embedded in the micro-grooves of the secondary lining 3 and is the energy absorption transition part between the main sealing layer 1 and the secondary lining 3. During construction, these honeycomb protrusions are embedded into the cavities one by one to ensure that they can closely cooperate with the inner wall of the secondary lining 3, fill the grooves, and ensure uniform stress. The honeycomb protrusions are circular or cylindrical protrusions, and the grooves fit with the honeycomb protrusions, so that the secondary sealing layer 2 can avoid being damaged due to excessive local stress.

[0052] To ensure that the bonding surface between the honeycomb protrusions and the secondary lining is smooth and firm, the honeycomb layer uses a polymer composite material to ensure the deformation ability of the honeycomb layer, and at the same time ensure the best interface bonding and coordinated deformation ability with the main sealing layer 1, and a polymer resin paint the same as the main sealing layer is sprayed in the grooves.

[0053] Regarding the secondary lining 3, the secondary lining 3 uses low-permeability concrete with a permeability < 1×10 -21 m 2 , optionally, the secondary lining 3 uses fiber-modified concrete, which provides a certain flexibility while ensuring airtightness and adapts to the inflation and deflation deformation of the storage structure.

[0054] Specifically, the fiber-modified concrete is compound-modified with steel fibers, basalt fibers, and polyvinyl alcohol fibers. After the fiber compound modification, the concrete will have a greater improvement in tensile and compressive strength, airtightness, etc., and can meet the airtightness and strength requirements of the storage bin. At the same time, due to the introduction of flexible fibers, the flexibility of the concrete has a greater improvement, and it can resist the cyclic deformation damage caused by the charging and discharging cycle.

[0055] In addition, the primary support 5 is treated with existing shotcrete to form the primary support 5 on the inner surface of the surrounding rock 6. If the integrity of the surrounding rock is poor, grouting is first used to reinforce the surrounding rock, and then the erection of the primary support is carried out; if grouting reinforcement treatment is carried out, the geophysical exploration method can be used to evaluate the reinforcement effect, and if the reinforcement effect is not achieved, supplementary treatment is continued.

[0056] In this embodiment, the waterproof layer 4 is an existing butyl rubber layer.

[0057] Considering the problems of water seepage and gas leakage, wet temperature sensors are arranged in the waterproof layer 4 and the secondary lining 3. Multiple groups of wet temperature sensors are arranged along the contour line of the compressed air storage bin structure, and each group is spaced at a set distance. The humidity sensor in the wet temperature sensor is used to detect whether there are water leakage defects in the waterproof layer, and the temperature sensor in the wet temperature sensor is set to obtain the temperature change in the secondary lining 3. If the temperature in the secondary lining 3 rises rapidly in a short time, it is possible that the internal sealing layer leaks; the wet temperature sensor is connected to the controller, and the controller is connected to the alarm. The controller can be a PLC controller or other types of controllers. The controller monitors the leakage signal in real time. When the humidity mutation > 15%RH, the controller controls the alarm to give an alarm.

[0058] It is easily understandable that the primary support 5, the waterproof layer 4, the secondary lining 3, and the sealing layer are also sequentially arranged at both ends of the storage bin structure. A sealing plug 7 is arranged at one section of the storage bin structure, and the air supply pipeline passes through the sealing plug; the end of the sealing plug away from the storage bin structure is a spindle-shaped cylinder, and the maximum height of the spindle-shaped cylinder is less than the height of the storage bin structure. Specifically, the head of the sealing plug 7 is a spindle-shaped cylinder with an angle greater than or equal to 90°, and the second half is a cylinder with equal width.

[0059] In the solution of this embodiment, sealing is achieved through the combination of the secondary lining 3, the main sealing layer 1 and the secondary sealing layer 2, which is the same as the sealing form of the traditional reservoir structure. This sealing structure uses low-permeability concrete and a polymer resin coating for collaborative sealing, and utilizes the characteristics of the honeycomb layer structure as an intermediate buffer. The traditional sealing structure uses polymer rubber / steel plates to undertake the main sealing function, and the sealing layer and the secondary lining 3 are usually bonded with resin, making it difficult to ensure the interfacial bonding ability. However, for the sealing structure provided in this embodiment, the rigid-flexible composite design of fiber-modified concrete and polymer coating, with the rigid matrix bearing the main compressive stress and the flexible component absorbing the cyclic deformation energy, solves the interfacial peeling problem caused by the difference in the thermal expansion coefficients of metal and concrete. Especially in the working condition of frequent inflation and deflation with deformation, due to the characteristics of fiber-modified concrete, the overall structure can adaptively adjust the stiffness distribution to avoid shear failure caused by stress concentration. This structure realizes a micro-expansion effect through flexible materials during the inflation stage to ensure the integrity of the seal; during the deflation stage, it uses rigid components to provide stable counter-pressure support, thereby effectively inhibiting gas penetration.

[0060] The entire structure can also be promoted in other directions: First, in the field of compressed air energy storage, it focuses on large-scale gas storage facilities such as salt caverns and rock caverns to solve the leakage problem caused by material creep under high-pressure environments, and at the same time adapt to distributed energy storage and the residual pressure recovery systems in industrial scenarios such as steel and chemical industries; Second, in the field of underground engineering, including the waterproof and anti-seepage transformation of tunnels and underground utility tunnels, as well as high-risk scenarios such as oil and gas storage reservoirs and nuclear waste repositories, flexible materials are used to adapt to geological deformations and reduce the cost of traditional steel plate linings; Third, in the field of new energy, such as the sealing of high-pressure hydrogen energy storage tanks and cryogenic liquefied air energy storage (LAES), customized material formulations are used to break through the technical bottlenecks under extreme environments.

[0061] Embodiment Two

[0062] This embodiment provides a construction method for a compressed air storage structure, including the following content:

[0063] S1. Judge the integrity of the surrounding rock 6 of the reservoir: Use ground-penetrating radar and core drilling method to comprehensively evaluate the fracture development degree of the surrounding rock 6. If the surrounding rock 6 has good integrity, proceed to step S4; if the integrity of the surrounding rock is poor, when it is detected that the length ratio of the surrounding rock fracture zone > 15% or the permeability > 1×10 -16 m 2 , it is determined that grouting reinforcement is required;

[0064] S2. Grouting reinforcement: Use a cement-sodium silicate composite slurry and conduct double-fluid grouting radially: The drilling depth is 8 - 12m, the circumferential spacing is 1.2m, and the drill holes are arranged in a plum blossom shape; the grouting pressure is controlled at 2 - 3 times the hydrostatic pressure (about 1.5 - 2.5MPa); the grouting volume is dynamically adjusted through real-time flow monitoring to ensure that the slurry diffusion radius ≥ 1.8m;

[0065] S3. After grouting is completed, use acoustic emission method and resistivity imaging method respectively to judge the grouting effect;

[0066] S4. Initial support construction: Spray steel fiber concrete: The concrete strength grade is C25, and the steel fiber dosage is 35 kg / m 3 (length 20 mm, diameter-thickness ratio 60), spray in layers to the designed thickness of 250 mm, and the surface flatness error < 10 mm / 2 m; Keep the humidity > 90% within 6 h after spraying, and the curing period ≥ 7 days;

[0067] S5. Waterproof layer laying: Apply epoxy resin primer (thickness 0.2 mm) on the surface of the initial support 5, and lay a 1.5-mm-thick butyl rubber waterproof layer 4 after curing: The joints are welded by hot melting, and the lap width ≥ 100 mm; Conduct a 48-h water tightness test after laying, and repair the leakage points until no visible water stains;

[0068] S6. Lay wet and temperature sensors: Circumferentially arrange a temperature and humidity sensor array at intervals of 3 m along the axis of the storage; The temperature and humidity sensors are embedded at the interface between the waterproof layer 4 and the secondary lining 3, and the measurement accuracy is ±0.5%RH / ±0.3°C;

[0069] S7. Pour the fiber-modified concrete secondary lining: On the basis of S1~S5, use fiber-reinforced modified concrete to construct the secondary lining 3, and reserve the position of the sealing plug during construction. The cross-sectional shape of the secondary lining 3 is circular to improve the stress condition. When designing the formwork of the secondary lining, a circular groove with a diameter of 5~10 mm is set on the side of the formwork facing the secondary lining 3. The groove will be distributed along the perimeter of the secondary lining, and reserve the construction position of the secondary sealing layer. The permeability of the secondary lining structure < 1×10 -21 m 2 ;

[0070] S8. Construct the sealing plug 7 to complete the sealing construction of the chamber: Refer to Figure 2 As shown, one end of the sealing plug is connected to the end of the storage structure;

[0071] S9. Pre-spray the same polymer resin coating as the main sealing layer into the groove of the secondary lining 3 to prevent the sealing layer from falling off due to construction defects. Embed the honeycomb protrusions into the cavity one by one to ensure that they can closely fit the inner wall of the secondary lining 3, fill the grooves, and ensure uniform stress to avoid damage caused by excessive local stress;

[0072] S10. Spraying a polymer resin coating on the basis of the secondary sealing layer 2 to complete the construction of the primary sealing layer. Subsequently, by using a high-resolution camera and an infrared thermal imager, combined with visual image analysis technology, check whether there are visible defects such as cracks, delamination or uneven coatings on the surface of the sealing layer. Finally, make the ultrasonic probe contact with the sealing layer, and detect whether there are cracks, bubbles or voids inside the sealing layer through ultrasonic detection to identify hidden defects. After detecting no defects, complete the overall sealing process.

[0073] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A compressed air storage structure, characterized in that, Along the radial direction of the reservoir structure, from the outside to the inside, it includes the primary support, waterproof layer, secondary lining, and sealing layer arranged in sequence. The sealing layer includes a main sealing layer and a secondary sealing layer. The secondary sealing layer is arranged between the main sealing layer and the secondary lining. The secondary lining forms a rigid matrix. The main sealing layer is formed by a polymer resin coating to form a flexible sealing layer. There are grooves on the inner surface of the secondary lining. The secondary sealing layer fills the grooves of the secondary lining. The secondary sealing layer has elasticity to absorb and disperse the stress caused by vibration to protect the secondary lining and the main sealing layer.

2. The structure of a compressed air storage reservoir according to claim 1, characterized in that, A plurality of the above-mentioned grooves are arranged along the inner surface of the secondary lining. The distance between adjacent two grooves is the same or different, and the length directions of the grooves are different.

3. The structure of a compressed air storage tank according to claim 1, characterized in that, The secondary sealing layer includes a honeycomb layer. A plurality of honeycomb protrusions are arranged on one side of the honeycomb layer facing the secondary lining. The honeycomb protrusions are clamped into the grooves of the secondary lining, and the honeycomb protrusions correspond to the grooves one by one.

4. A compressed air storage structure according to claim 1, characterized in that, From the bottom of the groove to the opening of the groove, the size of the groove gradually decreases so that the secondary sealing layer remains stable after being clamped in.

5. A compressed air storage structure according to claim 1, characterized in that, The secondary lining is made of fiber-modified concrete, and the primary support is made of sprayed steel fiber concrete.

6. The structure of a compressed air storage reservoir according to claim 1, characterized in that, The main sealing layer is made of an epoxy resin coating. The epoxy resin coating selects a spray-type epoxy resin coating, and the epoxy resin coating is added with a microcapsule slow-release repair agent.

7. A compressed air storage structure according to claim 1, characterized in that, A humidity and temperature sensor is also arranged between the waterproof layer and the secondary lining. The humidity and temperature sensor is respectively connected to a controller, and the controller is connected to an alarm.

8. A compressed air storage structure according to claim 1, characterized in that, The same primary support, waterproof layer, secondary lining, and sealing layer are also arranged at both ends of the reservoir structure in sequence. A sealing plug is arranged at one section of the reservoir structure, and the gas supply pipeline passes through the sealing plug. One end of the sealing plug away from the reservoir structure is a spindle-shaped cylinder, and the maximum height of the spindle-shaped cylinder is less than the height of the reservoir structure.

9. A construction method of a compressed air storage structure according to any one of claims 1-8, characterized in that, It includes the following contents: Construct the primary support inside the surrounding rock. Lay the waterproof layer on the inner surface of the primary support. Construct the secondary lining along the inner surface of the waterproof layer. There are convex parts on the side of the formwork of the secondary lining away from the center point of the reservoir structure, so that a plurality of grooves are formed after the secondary lining is formed. Pre-spray the same polymer resin coating as the main sealing layer into the grooves of the secondary lining. Arrange the secondary sealing layer along the inner surface of the secondary lining, and the secondary sealing layer fills the grooves of the secondary lining. Spray the polymer resin coating along the inner surface of the secondary sealing layer to form the main sealing layer.

10. The construction method of a compressed air storage structure according to claim 9, characterized in that, It includes the following contents: Before the construction of the primary support, first judge the integrity of the surrounding rock of the reservoir structure. If it is intact, carry out the primary support. If there is a broken zone in the surrounding rock and the length ratio of the broken zone is greater than the set value or the permeability of the surrounding rock is greater than the set value, it is necessary to grout and reinforce the surrounding rock.

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