Natural gas underground lining high-pressure reservoir structure and construction method

Abstract

The invention provides a natural gas underground lining high-pressure reservoir structure and a construction method, and relates to the technical field of underground lining.The natural gas underground lining high-pressure reservoir structure comprises a lining gas reservoir body, and a plurality of flexible sensors are arranged on the side, away from a reinforced concrete lining layer, of a first sealing layer; and a second sealing layer is arranged on the first sealing layer. According to the natural gas underground lining high-pressure reservoir structure, the multiple flexible sensors are arranged on the reinforced concrete lining layer, in this way, the stress change of the reinforced concrete lining layer and the temperature in the lining gas storage main body can be monitored in real time, risks can be predicted in advance, and adjustment can be made in time; the lining gas storage main body is provided with the first sealing layer and the second sealing layer, and the first sealing layer can prevent underground water from permeating into the cavern and prevent the underground water from influencing the bonding effect between the first sealing layer and the reinforced concrete lining layer; the second sealing layer can achieve the effect of preventing gas leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of underground linings, and in particular to a high-pressure storage structure and construction method for natural gas underground linings. Background Art

[0002] The national strategy urgently needs to develop efficient and safe gas storage technologies. As a clean energy source, natural gas has become one of the main energy sources for China's low-carbon and green development. Carrying out the construction of underground gas storage facilities and improving the natural gas storage and peak-shaving capabilities will become the main tasks of China's energy industry. The underground large-tank lined cavern has the advantages of high gas storage pressure, low construction difficulty, and low operation and maintenance difficulty, and has received more attention.

[0003] The existing lining structures of gas storage facilities are all prepared by the method of concrete-steel composite lining. However, due to the high cost of steel lining, large construction difficulty, weak co-deformation ability with concrete, local damage is likely to occur when storing high pressure inside, and it is not conducive to monitoring the gas storage situation in the gas storage facility. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-pressure storage structure and construction method for natural gas underground linings, so as to alleviate the technical problems that are relatively complex and not conducive to predicting risks in advance during the construction and operation of existing underground lined caverns.

[0005] The present invention provides a high-pressure storage structure for natural gas underground linings, including a lined gas storage main body, and the lined gas storage main body is arranged in the surrounding rock;

[0006] The lined gas storage main body includes a reinforced concrete lining layer, and the reinforced concrete lining layer abuts against the surrounding rock;

[0007] On the side of the reinforced concrete lining layer away from the surrounding rock, a first sealing layer is provided; on the side of the first sealing layer away from the reinforced concrete lining layer, a plurality of flexible sensors are provided;

[0008] And a second sealing layer is provided on the first sealing layer.

[0009] In an optional embodiment, the thickness of the reinforced concrete lining layer is 800 mm - 1500 mm.

[0010] In an optional embodiment, a steel mesh is arranged in the reinforced concrete lining layer, and the diameter of the steel bars of the steel mesh is 16 mm - 28 mm.

[0011] In an optional embodiment, the thickness of the first sealing layer is 0.5 mm - 2 mm, and the first sealing layer is coated with polyurea.

[0012] In an alternative embodiment, the plurality of flexible sensors include a plurality of stress sensors and a plurality of temperature sensors;

[0013] The plurality of stress sensors are arranged at intervals, and the interval between adjacent stress sensors is 1 m - 5 m;

[0014] The plurality of temperature sensors are arranged at intervals, and the interval between adjacent temperature sensors is 5 m - 8 m.

[0015] In an alternative embodiment, the thickness of the second sealing layer is 3 mm - 5 mm, and the second sealing layer is coated with polyurethane or polyethylene.

[0016] In an alternative embodiment, the reinforced concrete lining layer includes a plurality of concrete lining partitions; the coating range of the second sealing layer on each concrete lining partition is larger than the area of the concrete lining partition; the second sealing layers of adjacent concrete lining partitions overlap;

[0017] And the overlapping area of the second sealing layer is treated by physical compaction and applying an adhesive.

[0018] In an alternative embodiment, a protective coating is further included, and the protective coating is located on the side of the second sealing layer away from the first sealing layer.

[0019] On the reinforced concrete lining layer of the underground lining high-pressure gas storage structure provided by the present invention, a plurality of flexible sensors are provided, so that the stress change of the reinforced concrete lining layer and the temperature in the main body of the lining gas storage can be monitored in real time, risks can be predicted in advance, and adjustments can be made in a timely manner; and a first sealing layer and a second sealing layer are provided in the main body of the lining gas storage. The first sealing layer can prevent groundwater from penetrating into the chamber and avoid the influence of groundwater on the bonding effect between the first sealing layer and the reinforced concrete lining layer; the second sealing layer can prevent gas leakage.

[0020] The present invention provides a construction method for an underground lining high-pressure gas storage structure, including the following steps:

[0021] S1: Pour the reinforced concrete lining layer, and apply a surface treatment agent to the surface of the reinforced concrete lining layer to make the surface of the reinforced concrete lining layer smooth;

[0022] S2: Divide the reinforced concrete lining layer into partitions, and apply the first sealing layer to each concrete lining partition. The coating range of each first sealing layer should be larger than the area of the reinforced concrete lining layer partition;

[0023] When painting adjacent concrete lining sections, the junction between the two concrete lining sections is painted repeatedly and connected by means of an adhesive and pressing to ensure that there is no leakage at the junction between the two concrete lining sections;

[0024] S3: Install a flexible sensor on the surface of the first sealing layer;

[0025] S4: Paint a second sealing layer on each concrete lining section. The painting range of each second sealing layer should be larger than the area of the reinforced concrete lining section;

[0026] When painting adjacent concrete lining sections, the junction between the two concrete lining sections is painted repeatedly and connected by means of an adhesive and pressing to ensure that there is no leakage at the junction between the two concrete lining sections;

[0027] S5: Spray a protective coating on the surface of the second sealing layer.

[0028] In an alternative embodiment, in S2, the painting range of each first sealing layer should completely cover the reinforced concrete lining section, and the edge of the first sealing layer is 10 mm - 20 mm away from the edge of the reinforced concrete lining section.

[0029] In S4, the painting range of each second sealing layer should completely cover the reinforced concrete lining section, and the edge of the second sealing layer is 10 mm - 20 mm away from the edge of the reinforced concrete lining section.

[0030] The present invention provides a construction method for a high-pressure underground gas storage structure with a concrete lining. A first sealing layer and a second sealing layer are painted on the reinforced concrete lining layer. The first sealing layer can prevent groundwater from penetrating into the cavern and avoid the influence of groundwater on the bonding between the first sealing layer and the reinforced concrete lining layer. The sealing performance of the second sealing layer serves to prevent gas leakage; and there is a flexible sensor between the first sealing layer and the second sealing layer. Through the flexible sensor, the stress change of the reinforced concrete lining layer and the temperature inside the lining gas storage main body can be monitored in real time, enabling risks to be predicted in advance and adjustments to be made in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1It is a schematic structural diagram of the underground lined high-pressure gas storage structure provided by the embodiment of the present invention;

[0033] Figure 2 It is Figure 1 a schematic structural diagram of the cross-section of the underground lined high-pressure gas storage structure shown;

[0034] Figure 3 It is Figure 1 a partial structural diagram of the lined gas storage main body of the underground lined high-pressure gas storage structure shown;

[0035] Figure 4 It is a schematic diagram of a construction method of an underground lined high-pressure gas storage structure provided by the embodiment of the present invention.

[0036] Icon: 100 - Lined gas storage main body; 200 - Surrounding rock; 300 - Reinforced concrete lining layer; 400 - First sealing layer; 500 - Second sealing layer; 600 - Reinforcement mesh. Detailed implementation manners

[0037] The terms "first", "second", "third", etc. are only used for distinguishing descriptions, do not represent the serial numbers of arrangements, and cannot be understood as indicating or implying relative importance.

[0038] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0039] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "left", "right", "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed when in use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0040] In the description of the present application, unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements.

[0041] Next, the technical solutions of the present application will be clearly and completely described with reference to the drawings.

[0042] Reference Figures 1 - 3 The present invention provides a high-pressure underground lining gas storage structure for natural gas, including a lining gas storage main body 100, and the lining gas storage main body 100 is arranged in surrounding rock 200;

[0043] The lining gas storage main body 100 includes a reinforced concrete lining layer 300, and the reinforced concrete lining layer 300 abuts against the surrounding rock 200;

[0044] On one side of the reinforced concrete lining layer 300 away from the surrounding rock 200, a first sealing layer 400 is arranged; on one side of the first sealing layer 400 away from the reinforced concrete lining layer 300, a plurality of flexible sensors are arranged;

[0045] And a second sealing layer 500 is arranged on the first sealing layer 400.

[0046] In some embodiments, the cross-section of the lining gas storage main body 100 is generally annular, and the lining gas storage main body 100 includes two end head sections and a vertical cylinder section; one end head section is arranged at each of the upper and lower ends of the vertical cylinder section.

[0047] The reinforced concrete lining layer 300 of the lining gas storage main body 100 abuts against the surrounding rock 200; the inner surface of the reinforced concrete lining layer 300 is processed to make the inner wall of the reinforced concrete lining layer 300 smooth; in this way, it is convenient for the first sealing layer 400 to adhere better on it; a plurality of flexible sensors are arranged on the first sealing layer 400;

[0048] A second sealing layer 500 is arranged on the first sealing layer 400 to cover the flexible sensors, so that the flexible sensors are located between the first sealing layer 400 and the second sealing layer 500.

[0049] In this way, the stress change of the reinforced concrete lining layer 300 and the temperature inside the lining gas storage main body 100 can be monitored in real time, risks can be predicted in advance, and adjustments can be made in time; and a first sealing layer 400 and a second sealing layer 500 are arranged in the lining gas storage main body 100. The first sealing layer 400 can prevent groundwater from seeping into the cavern and avoid the influence of groundwater on the bonding effect between the first sealing layer 400 and the reinforced concrete lining layer 300; the sealing performance of the second sealing layer 500 realizes the function of preventing gas leakage.

[0050] In an alternative embodiment, the thickness of the reinforced concrete lining layer 300 is 800 mm - 1500 mm.

[0051] In an alternative embodiment, a steel mesh 600 is arranged in the reinforced concrete lining layer 300, and the diameter of the steel bars of the steel mesh 600 is 16 mm - 28 mm.

[0052] In an alternative embodiment, the thickness of the first sealing layer 400 is 0.5 mm - 2 mm, and the first sealing layer 400 is coated with polyurea.

[0053] In an alternative embodiment, the plurality of flexible sensors include a plurality of stress sensors and a plurality of temperature sensors; the plurality of stress sensors are arranged at intervals, and the interval between adjacent stress sensors is 1 m - 5 m; the plurality of temperature sensors are arranged at intervals, and the interval between adjacent temperature sensors is 5 m - 8 m.

[0054] In an alternative embodiment, the thickness of the second sealing layer 500 is 3 mm - 5 mm, and the second sealing layer 500 is coated with polyurethane or polyethylene.

[0055] In some embodiments, the thickness of the reinforced concrete lining layer 300 is 800 mm - 1500 mm; a steel mesh 600 is provided in the reinforced concrete lining layer 300, and the steel mesh 600 is arranged on the side of the reinforced concrete lining layer 300 away from the surrounding rock 200; the diameter of the steel bars of the steel mesh 600 is 16 mm - 28 mm; according to the size of the lining gas storage reservoir main body 100, the diameter of the steel bars of the steel mesh 600 is adjusted.

[0056] The thickness of the first sealing layer 400 is 0.5 mm - 2 mm, and the first sealing layer 400 is coated with polyurea; the thickness of the second sealing layer 500 is 3 mm - 5 mm, and the second sealing layer 500 is coated with polyurethane or polyethylene.

[0057] Utilize the good waterproof performance of polyurea to prevent groundwater from seeping into the cavern, and avoid affecting the bonding effect between the inner first sealing layer 400 and the reinforced concrete lining layer 300; coat polyurethane or polyethylene on the first sealing layer 400, and utilize its excellent sealing performance to prevent gas leakage.

[0058] In an alternative embodiment, the plurality of flexible sensors include a plurality of stress sensors and a plurality of temperature sensors; the plurality of stress sensors are arranged at intervals, and the interval between adjacent stress sensors is 1 m - 5 m; the plurality of temperature sensors are arranged at intervals, and the interval between adjacent temperature sensors is 5 m - 8 m.

[0059] In some embodiments, the flexible sensors include stress sensors and temperature sensors, the stress sensors are arranged at intervals, and the interval between adjacent stress sensors is between 1 m - 5 m; stress sensors are provided in both the head section and the vertical cylinder section, and the interval between the stress sensors provided at the connection between the head section and the vertical section is relatively small.

[0060] Multiple temperature sensors are arranged at intervals, and the interval between adjacent temperature sensors is 5m - 8m; the intervals of the temperature sensors arranged near the inlet and outlet of the lining gas storage reservoir main body 100 are smaller.

[0061] The temperature sensors can monitor the temperature and pressure changes in the lining gas storage reservoir main body 100 in real time; pressure sensors can also be arranged in the lining gas storage reservoir main body 100 to detect the pressure changes in the lining gas storage reservoir main body 100.

[0062] Among them, the stress and strain sensors and the temperature sensors are embedded in the coating, and the characteristics of polyurethane are used to prevent the two from affecting each other.

[0063] In an alternative embodiment, the reinforced concrete lining layer 300 includes a plurality of concrete lining partitions; the painting range of the second sealing layer 500 on each concrete lining partition is larger than the area of the concrete lining partition; the second sealing layers 500 of adjacent concrete lining partitions overlap;

[0064] And the overlapping area of the second sealing layer 500 is treated by physical compaction and applying a binder.

[0065] The reinforced concrete lining layer 300 includes a plurality of concrete lining partitions. When the first sealing layer 400 and the second sealing layer 500 are painted on the concrete lining partitions, the painting areas of the first sealing layer 400 and the second sealing layer 500 are both larger than the area of the concrete lining partition. Generally, the distance between the edges of the first sealing layer 400 and the second sealing layer 500 and the edges of the concrete lining partition is 10mm - 20mm.

[0066] The edges of the first sealing layer 400 and the second sealing layer 500 of adjacent concrete lining partitions overlap, and the overlapping part is treated by physical compaction and applying a binder to ensure the sealing performance of the sealing layer.

[0067] In an alternative embodiment, a protective coating is further included, and the protective coating is located on the side of the second sealing layer 500 away from the first sealing layer 400.

[0068] A protective coating is also painted on the second sealing layer 500. Generally, the protective coating is painted with polyurea; polyurea is an elastomeric substance formed by the reaction of an isocyanate component and an amino compound component, which enhances the abrasion resistance and chemical resistance of the second sealing layer 500 and prevents subsequent construction from affecting its sealing performance.

[0069] On the reinforced concrete lining layer 300 of the underground lined high-pressure gas storage structure provided by the present invention, a plurality of flexible sensors are provided, so as to be able to monitor the stress change of the reinforced concrete lining layer 300 and the temperature inside the lined gas storage main body 100 in real time, be able to predict risks in advance and make adjustments in time; and a first sealing layer 400 and a second sealing layer 500 are provided on the lined gas storage main body 100. The first sealing layer 400 can prevent groundwater from penetrating into the chamber and avoid the influence of groundwater on the bonding effect between the first sealing layer 400 and the reinforced concrete lining layer 300; the second sealing layer 500 can play a role in preventing gas leakage.

[0070] Referring to Figure 4 , the present invention provides a construction method for an underground lined high-pressure gas storage structure, including the following steps:

[0071] S1: Pour the reinforced concrete lining layer 300, and apply a surface treatment agent to the surface of the reinforced concrete lining layer 300 to make the surface of the reinforced concrete lining layer 300 smooth;

[0072] S2: Divide the reinforced concrete lining layer 300 into zones, and apply the first sealing layer 400 to each concrete lining zone. The application range of each piece of the first sealing layer 400 should be larger than the area of the reinforced concrete lining layer 300 zone;

[0073] When applying to adjacent concrete lining zones, the junction between the two concrete lining zones is repeatedly applied, and is connected by means of an adhesive and pressing to ensure that there is no leakage at the junction between the two concrete lining zones;

[0074] S3: Set flexible sensors on the surface of the first sealing layer 400;

[0075] S4: Apply the second sealing layer 500 to each concrete lining zone. The application range of each piece of the second sealing layer 500 should be larger than the area of the reinforced concrete lining layer 300 zone;

[0076] When applying to adjacent concrete lining zones, the junction between the two concrete lining zones is repeatedly applied, and is connected by means of an adhesive and pressing to ensure that there is no leakage at the junction between the two concrete lining zones;

[0077] S5: Spray a protective coating on the surface of the second sealing layer 500.

[0078] In an optional embodiment, in S2, the application range of each piece of the first sealing layer 400 should completely cover the reinforced concrete lining layer 300 zone, and the edge of the first sealing layer 400 is 10 mm - 20 mm away from the edge of the reinforced concrete lining layer 300 zone.

[0079] In S4, the painting range of each piece of the second sealing layer 500 should completely cover the partition of the reinforced concrete lining layer 300, and the distance between the edge of the second sealing layer 500 and the edge of the partition of the reinforced concrete lining layer 300 is 10 mm - 20 mm.

[0080] The underground lining high-pressure gas storage structure is a vertical large-tank type, and the gas storage pressure can reach 15 - 25 MPa, belonging to an ultra-high-pressure gas storage reservoir; the surrounding rock 200 is generally class II - class III surrounding rock 200 with a relatively wide distribution; the cross-section of each layer of the reinforced concrete lining layer 300 is annular, and the sealing layer is directly painted on the reinforced concrete lining layer 300 and compacted.

[0081] The steel mesh 600 is configured in the reinforced concrete lining layer 300, and the steel mesh 600 can effectively inhibit the development of concrete cracks; the prestressed anchor cable can generate compressive stress in the concrete, thereby offsetting the tensile stress when the concrete is stressed, achieving the effects of controlling concrete cracks and reducing structural deformation; the reinforced concrete lining layer 300 is constructed by the jacking method, and a jack is used to support the concrete formwork during construction; after the pouring and curing of the reinforced concrete lining layer 300 are completed, a surface treatment agent should be applied to the surface to increase the surface smoothness and ensure that the sealing layer can adhere well to it;

[0082] The main material of the first sealing layer 400 is polyurea, with a thickness of 0.5 - 2 mm. Using the good waterproof performance of polyurea, it can well prevent groundwater from seeping in and affecting the normal use of the sensor and the second sealing layer 500; at the same time, polyurea has strong adhesion and can well connect the second sealing layer 500 and the reinforced concrete lining layer 300.

[0083] When the second sealing layer 500 is laid with polyurethane material, the flexible sensor can be set in the second sealing layer 500 by an integrated design method and then laid.

[0084] The reinforced concrete lining layer 300 is poured and constructed by the jacking method, and the lower-layer concrete is poured and cured; a surface treatment agent is applied to the surface of the cured and demolded reinforced concrete to make the concrete surface smoother.

[0085] The present invention provides a construction method for a high-pressure underground gas storage structure with a concrete lining. A first sealing layer 400 and a second sealing layer 500 are coated on the reinforced concrete lining layer 300. The first sealing layer 400 can prevent groundwater from penetrating into the cavern and avoid the influence of groundwater on the bonding effect between the first sealing layer 400 and the reinforced concrete lining layer 300. The sealing performance of the second sealing layer 500 serves to prevent gas leakage. Moreover, a flexible sensor is provided between the first sealing layer 400 and the second sealing layer 500. Through the flexible sensor, the stress change of the reinforced concrete lining layer 300 and the temperature inside the lining gas storage main body 100 can be monitored in real time, enabling early prediction of risks and timely adjustment.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A natural gas underground lined high pressure storage structure, characterized in that: It comprises a lined gas storage reservoir body (100), wherein the lined gas storage reservoir body (100) is arranged in surrounding rocks (200); The lined gas storage reservoir body (100) comprises a reinforced concrete lining layer (300), wherein the reinforced concrete lining layer (300) abuts against the surrounding rock (200); A first sealing layer (400) is provided on a side of the reinforced concrete lining layer (300) away from the surrounding rock (200); and a plurality of flexible sensors are provided on a side of the first sealing layer (400) away from the reinforced concrete lining layer (300); A second sealing layer (500) is arranged on the first sealing layer (400).

2. The natural gas underground lined high-pressure storage structure according to claim 1, characterized in that: The thickness of the reinforced concrete lining layer (300) is 800 mm-1500 mm.

3. The natural gas underground lined high-pressure storage structure according to claim 1, characterized in that: A steel mesh (600) is arranged in the reinforced concrete lining layer (300), and the diameter of the steel bars of the steel mesh (600) is 16 mm to 28 mm.

4. The natural gas underground lined high-pressure storage structure according to claim 1, characterized in that: The thickness of the first sealing layer (400) is 0.5 mm to 2 mm, and the first sealing layer (400) is coated with polyurea.

5. The natural gas underground lined high-pressure storage structure according to claim 1, characterized in that: The plurality of flexible sensors include a plurality of stress sensors and a plurality of temperature sensors; The plurality of stress sensors are arranged at intervals, and the interval between adjacent stress sensors is 1m-5m; The plurality of temperature sensors are arranged at intervals, and the interval between adjacent temperature sensors is 5m-8m.

6. The natural gas underground lined high-pressure storage structure according to claim 1, characterized in that: The thickness of the second sealing layer (500) is 3 mm to 5 mm, and the second sealing layer (500) is coated with polyurethane or polyethylene.

7. The natural gas underground lined high-pressure storage structure according to claim 1, characterized in that: The reinforced concrete lining layer (300) comprises a plurality of concrete lining partitions; the second sealing layer (500) on each of the concrete lining partitions has a coating range larger than the area of ​​the concrete lining partition; the second sealing layers (500) of adjacent concrete lining partitions overlap; The overlapping area of ​​the second sealing layer (500) is processed by physical compaction and adhesive application.

8. The natural gas underground lined high-pressure storage structure according to claim 1, characterized in that: A protective coating is also included, and the protective coating is located on a side of the second sealing layer (500) away from the first sealing layer (400).

9. A construction method for a natural gas underground lining high-pressure storage structure, characterized in that: The steps include: S1: pouring a reinforced concrete lining layer (300), applying a surface treatment agent to the surface of the reinforced concrete lining layer (300) to make the surface of the reinforced concrete lining layer (300) smooth; S2: Divide the reinforced concrete lining layer (300) into sections, and apply the first sealing layer (400) to each concrete lining section. The application range of each first sealing layer (400) should be larger than the area of ​​the section of the reinforced concrete lining layer (300); When the adjacent concrete lining partitions are painted, the junction between the two concrete lining partitions shall be painted repeatedly and connected by adhesive and pressing to ensure that there will be no leakage at the junction between the two concrete lining partitions; S3: Arranging a flexible sensor on the surface of the first sealing layer (400); S4: Apply the second sealing layer (500) to each concrete lining partition, and the application range of each second sealing layer (500) should be larger than the area of ​​the reinforced concrete lining layer (300) partition; When the adjacent concrete lining partitions are painted, the junction between the two concrete lining partitions shall be painted repeatedly and connected by adhesive and pressing to ensure that there will be no leakage at the junction between the two concrete lining partitions; S5: spraying a protective coating on the surface of the second sealing layer (500).

10. The construction method of the natural gas underground lining high-pressure storage structure according to claim 9, characterized in that: In S2, the coating range of each first sealing layer (400) should completely cover the partition of the reinforced concrete lining layer (300), and the distance between the edge of the first sealing layer (400) and the edge of the partition of the reinforced concrete lining layer (300) is 10mm-200mm; In S4, the coating range of each second sealing layer (500) should completely cover the partition of the reinforced concrete lining layer (300), and the distance between the edge of the second sealing layer (500) and the edge of the partition of the reinforced concrete lining layer (300) is 10mm-200mm.

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