An annular support structure for an underground gas storage and a method of construction

Abstract

The application discloses an annular support structure of an underground gas storage and a construction method, relates to the technical field of underground high-pressure gas storage, and the annular support structure comprises a concrete lining layer, a sealing layer and a partition piece, the concrete lining layer is provided with a plurality of gaps in the annular direction, the plane where the annular direction is located is perpendicular to the extension direction of the gas storage, the sealing layer is at least partially attached to the concrete lining layer, the sealing layer is provided with elastic buffer parts corresponding to the gaps in the annular direction, and the partition piece is connected with the concrete lining layer at two ends in the width direction of the gap. The elastic buffer part is protruded in the direction away from the concrete lining layer, and a containing cavity is formed between the elastic buffer part and the concrete lining layer, the containing cavity is used for containing buffer material, and the partition piece is configured to prevent the buffer material from leaking through the gap. The scheme can improve the reliability of the annular support structure.

Description

Technical Field

[0001] This invention relates to the field of underground high-pressure gas storage technology, specifically to a ring support structure and construction method for an underground gas storage facility. Background Technology

[0002] Cavern hydrogen storage and compressed air energy storage are both large-scale energy storage technologies, with the use of underground artificial chambers as gas storage facilities being a key technological aspect. Artificial chamber gas storage involves excavating vast spaces deep within mountains to store high-pressure air. Compressed air energy storage, as a highly promising large-scale physical energy storage technology, boasts advantages such as large storage capacity and long service life.

[0003] In related technologies, to ensure the airtightness and structural safety of gas storage facilities, concrete lining is usually installed on the inner wall of the chamber, and a steel sealing layer with excellent airtightness is laid on the inner side of the concrete lining. During the gas filling (energy storage) process, the pressure inside the gas storage facility increases significantly, causing the entire chamber structure to tend to expand outward, which causes the concrete lining and steel sealing layer to deform, and may even cause the steel sealing layer to tear, resulting in the failure of the gas storage facility's airtightness. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a ring support structure and construction method for underground gas storage facilities, thereby solving the technical problem of insufficient support reliability leading to gas storage facility airtightness failure in the prior art.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides an annular support structure for an underground gas storage facility, comprising a concrete lining layer, a sealing layer, and an isolation member. The concrete lining layer has multiple gaps spaced at intervals along an annular direction, and the plane of the annular direction is perpendicular to the extension direction of the gas storage facility. The sealing layer is at least partially attached to the concrete lining layer, and the sealing layer has elastic buffer portions along the annular direction that correspond one-to-one with the gaps. The isolation member is connected to the concrete lining layer at both ends along the width direction of the gaps. The elastic buffer portions protrude away from the concrete lining layer and form a receiving cavity with the concrete lining layer. The receiving cavity is used to receive buffer material, and the isolation member is configured to prevent the buffer material from leaking through the gaps.

[0007] In some embodiments, the spacer is located at the opening on the side of the gap near the sealing layer, and the spacer is used to separate the receiving cavity from the gap.

[0008] In some embodiments, the width b1 of the isolation member and the opening width b2 of the elastic buffer portion toward the concrete lining layer satisfy b1≥b2.

[0009] In some embodiments, the two ends of the isolation member along the width direction of the gap are respectively sealed to the concrete lining layer, and the width b1 of the isolation member satisfies 400mm≤b1≤600mm.

[0010] In some embodiments, the sealing layer includes a plurality of sub-seals connected in an annular direction, each sub-seal being provided with an elastic buffer portion.

[0011] In some embodiments, the sub-seal and the isolator are made of ferrous or alloy materials.

[0012] In some embodiments, the elastic buffer portion includes an arcuate area, or the elastic buffer portion includes a plurality of connected folds.

[0013] In some embodiments, multiple slits are evenly spaced along the circumferential direction, and the width b3 of the slits satisfies 5mm≤b3≤10mm.

[0014] In some embodiments, the cushioning material includes one or more of rubber, polyurethane, or epoxy resin.

[0015] Secondly, the present invention also provides a construction method for a ring-shaped support structure of an underground gas storage facility. The construction method includes: pouring a concrete lining layer on the excavated surrounding rock and reserving gaps of a predetermined width at intervals along the ring direction; connecting the two ends of the isolation member along the width direction of the gap to the concrete lining layer to prevent the buffer material from leaking through the gap; attaching the sealing layer to the concrete lining layer and ensuring that the elastic buffer part of the sealing layer corresponds one-to-one with the gap; and injecting buffer material into the cavity between the elastic buffer part and the concrete lining layer.

[0016] Compared with existing technologies, the annular support structure for an underground gas storage facility provided by this invention, by setting multiple gaps in the concrete lining layer and setting elastic buffer parts corresponding to the gaps in the sealing layer, will preferentially concentrate the expansion deformation of the concrete lining layer at the gaps when the internal pressure of the gas storage facility increases, thereby increasing its width and preventing the concrete lining layer from causing forced tensile damage to the sealing layer; at the same time, the elastic buffer parts of the sealing layer can provide a margin for the expansion deformation of the sealing layer, further reducing the possibility of the sealing layer tearing due to pressure; and the buffer material located in the receiving cavity can provide support for the elastic buffer parts, so that the elastic buffer parts can smoothly cope with the changes in internal pressure of the gas storage facility, thereby improving the overall reliability of the annular support structure. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the annular support structure provided in an embodiment of the present invention;

[0018] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0019] Figure 3 This is a schematic diagram of the support structure after compression and expansion deformation provided in an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the construction method for the ring support structure provided in an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100. Circular support structure; 110. Concrete lining layer; 111. Gap; 120. Sealing layer; 121. Elastic buffer section; 130. Isolation component; 140. Receiving cavity; 150. Buffer material; 200. Surrounding rock; 300. Construction method. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] To ensure the airtightness and structural safety of the gas storage facility, the steel sealing layer is usually tightly bonded to the concrete lining. During the gas filling (energy storage) process, the pressure inside the gas storage facility increases significantly, causing the entire chamber structure to tend to expand outward.

[0025] In cases where the surrounding rock is of high grade (e.g., grade II or above) and the geological conditions are good and the rock mass is hard, the surrounding rock can provide sufficient restraining reaction force to inhibit the expansion of the chamber. Therefore, the circumferential deformation and stress of the concrete lining and steel sealing layer are within a controllable range.

[0026] However, under lower surrounding rock grades (e.g., Grade III), the surrounding rock is relatively soft and provides insufficient restraint. Under the immense internal pressure of the gas storage facility, the concrete lining will undergo significant circumferential expansion deformation. Because the steel sealing layer is tightly bonded to the concrete lining, it may be forced to stretch and deform along with the concrete lining, generating enormous circumferential tensile stress. When this circumferential tensile stress exceeds the yield strength of the steel, it can cause plastic deformation or even tearing of the steel sealing layer, leading to airtightness failure.

[0027] To address the technical problem of insufficient support reliability leading to airtightness failure in gas storage facilities, this invention provides a ring-shaped support structure for underground gas storage facilities. By setting multiple gaps in the concrete lining layer and corresponding elastic buffer sections in the sealing layer, when the internal pressure of the gas storage facility increases, the expansion deformation of the concrete lining layer will preferentially concentrate at the gaps, increasing their width and preventing forced tensile damage to the sealing layer. Simultaneously, the elastic buffer sections of the sealing layer provide allowance for expansion deformation, further reducing the possibility of tearing due to pressure. Furthermore, the buffer material located within the containment cavity provides support for the elastic buffer sections, enabling them to smoothly respond to changes in internal pressure within the gas storage facility, thereby improving the overall reliability of the ring-shaped support structure.

[0028] It should be noted that the annular support structure for the underground gas storage facility provided by this invention is applicable to, but not limited to, geological conditions of Class III surrounding rock. The annular support structure of this application is also applicable to other geological conditions of surrounding rock, such as Class II surrounding rock, Class III surrounding rock, and so on.

[0029] This application provides a ring-shaped support structure 100 for an underground gas storage facility, such as... Figure 1 As shown, the annular support structure 100 includes a concrete lining layer 110, a sealing layer 120, and an isolation member 130. The concrete lining layer 110 has multiple gaps 111 spaced apart along the annular direction, and the plane of the annular direction is perpendicular to the extension direction of the gas storage tank. The sealing layer 120 is at least partially attached to the concrete lining layer 110, and the sealing layer 120 has elastic buffer portions 121 along the annular direction that correspond one-to-one with the gaps 111. The isolation member 130 is connected to the concrete lining layer 110 at both ends along the width direction of the gaps 111. The elastic buffer portion 121 protrudes away from the concrete lining layer 110 and forms a receiving cavity 140 with the concrete lining layer 110. The receiving cavity 140 is used to receive the buffer material 150, and the isolation member 130 is configured to prevent the buffer material 150 from leaking through the gaps 111.

[0030] The concrete lining layer 110 is in contact with the surrounding rock 200, serving as structural support and foundation protection for the annular support structure 100. When the pressure inside the gas storage facility is excessive, the concrete lining layer 110 exerts an amplifying compressive force on the surrounding rock 200, while the surrounding rock 200 provides a corresponding reverse supporting force to the concrete lining layer 110. In some embodiments, the pressure inside the gas storage facility can be between 10 MPa and 18 MPa.

[0031] The concrete lining layer 110 has multiple gaps 111 spaced at intervals along the circumferential direction. Figure 1As indicated by the middle arrow, gap 111 is a weak point in the circumferential expansion of the concrete lining layer 110, and also a point where the circumferential deformation of the concrete lining layer 110 is released. When the internal pressure of the gas storage tank increases, the expansion deformation of the concrete lining layer 110 will preferentially concentrate at gap 111, increasing its width. This avoids the concrete lining layer 110 exerting forced tension on the sealing layer 120 in other parts.

[0032] In some implementations, multiple gaps 111 are evenly spaced along the circumferential direction of the concrete lining layer 110; in other implementations, multiple gaps 111 are non-uniformly spaced along the circumferential direction of the concrete lining layer 110.

[0033] The sealing layer 120 contacts the inner side of the concrete lining layer 110 and is used to form a sealed space to block the infiltration of high-pressure gas and prevent gas leakage from causing losses or safety hazards. Therefore, the sealing layer 120 needs to meet the requirements of support strength and sealing performance. For example, the sealing layer 120 can be a sealing layer made of rigid material.

[0034] When the pressure inside the gas storage tank is too high, the sealing layer 120 will tend to expand, exerting compressive force on the concrete lining layer 110. In turn, the concrete lining layer 110 provides a reverse supporting force to the sealing layer 120. As the concrete lining layer 110 expands, it may cause the sealing layer 120 to deform, which may lead to tearing of the sealing layer 120.

[0035] The sealing layer 120 is provided with an elastic buffer portion 121, which provides a margin when the sealing layer 120 undergoes annular expansion under pressure. When the pressure inside the gas storage tank increases, the elastic buffer portion 121 has the ability to deform from a bulge to a gradual straightening. The deformation process of the elastic buffer portion 121 absorbs and compensates for the circumferential strain of the sealing layer 120, so that the sealing layer 120 can undergo large deformation in a coordinated and low-stress manner, rather than being forcibly straightened and subjected to high stress.

[0036] The elastic buffer 121 is arranged opposite to the gap 111. When the internal pressure of the gas storage tank increases, the expansion deformation of the concrete lining layer 110 will be concentrated at the gap 111, increasing its width. Correspondingly, the elastic buffer 121, which is directly opposite the gap 111, provides a margin when it expands in an annular shape under pressure. When the concrete lining layer 110 and the sealing layer 120 expand, the deformation locations are approximately the same, thus minimizing the risk of tearing of the sealing layer 120 caused by the expansion of the concrete lining layer 110.

[0037] The isolation element 130 is connected to the concrete lining layer 110 at both ends along the width of the gap 111 to prevent the internal space of the gas storage facility from connecting with the outside through the gap 111. Therefore, the sealing layer 120 also needs to meet certain requirements for support strength and sealing performance. For example, the isolation element 130 can be a rigid material.

[0038] The connection position between the isolation member 130 and the concrete lining layer 110 is not limited. For example, the isolation member 130 may be located at the edge of the gap 111 near the opening; or the isolation member 130 may be located at the middle of the gap 111.

[0039] The connection method between the isolation element 130 and the concrete lining layer 110 is not limited. For example, the isolation element 130 and the concrete lining layer 110 are connected by welding; or the isolation element 130 and the concrete lining layer 110 are connected by chemical anchors.

[0040] The elastic buffer 121 protrudes away from the concrete lining layer 110 and forms a receiving cavity 140 with the concrete lining layer 110. The protruding structure of the elastic buffer 121 can be understood as the margin provided when the sealing layer 120 undergoes annular expansion under pressure. When the pressure inside the gas storage tank increases, the elastic buffer 121 changes from protrusion to a gentle straight deformation to compensate for the circumferential strain of the sealing layer 120.

[0041] The receiving cavity 140 is used to receive the cushioning material 150, which provides flexible support for the elastic cushioning part 121 to prevent it from deforming prematurely or too quickly, thereby causing irreversible deformation of the elastic cushioning part 121. The cushioning material 150 can be a polymer material that is resistant to high temperature and aging, has a high elastic modulus, and a high Poisson's ratio.

[0042] When the pressure inside the gas storage tank increases, the pressure is transmitted to the elastic buffer section 121. The cavity 140 formed by the elastic buffer section 121 will be compressed, and the buffer material 150 inside the cavity 140 will also be compressed. The reaction force generated by the buffer material 150 will also increase. On the one hand, it provides support for the sealing layer 120, and on the other hand, it controls the speed and amplitude of the expansion of the gaps 111 in the concrete lining layer 110, so that the deformation of the entire annular support structure 100 is smooth and controllable, avoiding brittle failure or uncontrolled deformation.

[0043] The isolation element 130 blocks the gap 111, which can effectively prevent the buffer material 150 from leaking into the surrounding rock 200 through the gap 111 when the buffer material 150 is compressed, thus preventing the surrounding rock 200 from being locally damaged and causing more serious consequences.

[0044] It should be noted that during the gas storage tank filling process (energy storage), the pressure inside the gas storage tank increases significantly, and the elastic buffer part 121 of the concrete lining layer 110 and the sealing layer 120 will expand and deform. During the gas storage tank exhaust process (energy release), the pressure inside the gas storage tank will gradually decrease, and the elastic buffer part 121 of the concrete lining layer 110 and the sealing layer 120 may rebound and deform. The buffer material 150 located in the receiving cavity 140 provides rebound force when the elastic buffer part 121 rebounds and deforms, thereby extending the service life of the ring support structure 100.

[0045] By setting multiple gaps 111 on the concrete lining layer 110 and setting elastic buffer parts 121 corresponding to the gaps 111 on the sealing layer 120, when the internal pressure of the gas storage tank increases, the expansion deformation of the concrete lining layer 110 will preferentially concentrate at the gaps 111, increasing its width, thereby preventing the concrete lining layer 110 from causing forced tensile damage to the sealing layer 120; at the same time, the elastic buffer part 121 of the sealing layer 120 can provide a margin for the expansion deformation of the sealing layer 120, further reducing the possibility of the sealing layer 120 tearing due to pressure; and the buffer material 150 located in the receiving cavity 140 can provide support for the elastic buffer part 121, so that the elastic buffer part 121 can smoothly cope with the changes in internal pressure of the gas storage tank, thereby improving the overall reliability of the annular support structure 100.

[0046] Furthermore, the joints 111 of the concrete lining layer 110, the elastic buffer portion 121 of the sealing layer 120, and the buffer material 150 located in the receiving cavity 140 work together to make the annular support structure 100 a structure that can actively cope with the expansion deformation compensation of internal pressure. The sealing layer 120 transforms from a single passive "bearer" to an active "deformation coordinator", avoiding the high stress of the sealing layer 120 as a whole through the deformation of the elastic buffer portion 121, which significantly improves the support reliability under low surrounding rock grades.

[0047] In some embodiments, such as Figure 2 and Figure 3 As shown, the isolation member 130 is located at the opening of the gap 111 near the sealing layer 120, and the isolation member 130 is used to separate the receiving cavity 140 from the gap 111.

[0048] The isolator 130 is positioned at the opening of the gap 111 near the sealing layer 120, which prevents the cushioning material 150 from entering the gap 111 under pressure. This saves on the amount of cushioning material 150 used and reduces costs. Furthermore, as the overall structure is a ring-shaped support, the deformation at the opening of the gap 111 near the sealing layer 120 is slightly smaller than that at the opening away from the sealing layer 120. The isolator 130's position at the opening of the gap 111 near the sealing layer 120 helps improve the stability of the connection between the isolator 130 and the concrete lining layer 110. It also facilitates the connection between the isolator 130 and the concrete lining layer 110 by welding or chemical anchors.

[0049] like Figure 2 and Figure 3 As shown, Figure 2 for Figure 1 A partially enlarged schematic diagram of section A, which is also a schematic diagram of the supporting structure before expansion and deformation; Figure 3 This is a schematic diagram of the supporting structure after it has been deformed by compression.

[0050] In some embodiments, the width b1 of the separator 130 and the opening width b2 of the elastic buffer portion 121 toward the concrete lining layer 110 satisfy b1≥b2.

[0051] This means that the width of the isolation member 130 is greater than or equal to the span between the elastic buffer portion 121 and the concrete lining layer 110, the opening of the elastic buffer portion 121 is opposite to the isolation member 130, and the isolation member 130 and the elastic buffer portion 121 surround each other to form a receiving cavity 140.

[0052] The buffer material 150 inside the cavity 140 does not contact the concrete lining layer 110, and the buffer material 150 directly provides compressive or supporting force to the elastic buffer part 121 and the isolation member 130.

[0053] When the pressure inside the gas storage tank increases, the pressure is transmitted to the elastic buffer section 121, which compresses the receiving cavity 140 formed by the elastic buffer section 121. The buffer material 150 inside the receiving cavity 140 is also compressed. The isolation member 130 provides support for the buffer material 150 inside the receiving cavity 140. The buffer material 150 does not come into contact with the concrete lining layer 110, which effectively prevents the buffer material 150 from being squeezed into the concrete lining layer 110 due to pressure, thereby minimizing the risk of local compression damage to the concrete lining layer 110 caused by the buffer material 150 under pressure.

[0054] It should be noted that when the internal pressure of the gas storage tank increases, the opening width b2 of the elastic buffer section 121 towards the concrete lining layer 110 will increase accordingly, such as... Figure 2 and Figure 3As shown, at this moment, the width b1 of the isolation member 130 still satisfies the condition that it is greater than or equal to the opening width b2 of the concrete lining layer 110.

[0055] For example, the width b1 of the isolation component 130 is 500mm. When the gas storage tank is filled with gas, the opening width b2 of the elastic buffer part 121 toward the concrete lining layer 110 is 300mm. When the gas storage tank is filled with gas at a pressure of 15MPa, the opening width b2 of the elastic buffer part 121 toward the concrete lining layer 110 is 400mm. Therefore, regardless of whether the elastic buffer part 121 is deformed due to pressure, the condition b1≥b2 is always satisfied.

[0056] In some embodiments, such as Figure 2 and Figure 3 As shown, the two ends of the isolation member 130 along the width direction of the gap are respectively sealed to the concrete lining layer 110. The width b1 of the isolation member 130 satisfies 400mm≤b1≤600mm.

[0057] The two ends of the isolation element 130 along the width of the gap are respectively sealed to the concrete lining layer 110, which means that the isolation element 130 extends into the concrete lining layer 110 at least partially, so as to avoid the buffer material 150 from entering the concrete lining layer 110 in the circumferential direction as much as possible.

[0058] The width b1 of the spacer 130 can be 400mm, 410mm, 420mm, 430mm, 440mm, 450mm, 460mm, 470mm, 480mm, 490mm, 500mm, or any value between any two adjacent values ​​mentioned above.

[0059] In some embodiments, the sealing layer 120 includes a plurality of sub-seals connected in an annular direction, each sub-seal being provided with an elastic buffer portion 121.

[0060] The sealing layer 120 has a ring structure. For example, since the gas storage tank is relatively small, the sealing layer 120 can adopt an integrally molded structure to improve the overall structural strength performance.

[0061] Given the large size of the gas storage facility, and considering the ease of processing and transportation, a modular assembly approach can be adopted. Specifically, the sealing layer 120 comprises multiple sub-seals, each equipped with an elastic buffer portion 121. Each sub-seal has identical structural dimensions, which facilitates mass production of the sub-seals and improves the efficiency of sealing layer 120 installation.

[0062] For example, the sealing layer 120 includes multiple interconnected sub-seals along the circumferential direction. The specific number can be determined according to actual needs, such as 2, 4, 6, 8, 10, 12, 16, etc. For example, 12 sub-seals are connected sequentially along the circumferential direction to form a complete sealing layer 120.

[0063] In some embodiments, the sub-seal and the spacer 130 are made of ferrous or alloy materials.

[0064] To improve the structural performance of the sub-seal and isolator 130, the sub-seal and isolator 130 can be made of metallic materials. For example, the sub-seal and isolator 130 can be made of ferrous material; for example, the sub-seal and isolator 130 can be made of alloy material, such as steel.

[0065] In some embodiments, the sub-seal and the spacer 130 may be made of the same material. In some embodiments, the sub-seal and the spacer 130 may also be made of different materials.

[0066] In some embodiments, the elastic buffer portion 121 includes an arcuate region, or the elastic buffer portion 121 includes a plurality of connected folds.

[0067] The elastic buffer portion 121 is a structure that undergoes elastic deformation under pressure. Any structure that can provide a margin for the sealing layer 120 to undergo annular expansion under pressure meets the requirements of this application.

[0068] In some embodiments, the elastic buffer portion 121 includes an arcuate region, and the plane formed by the arcuate region is the allowance provided when the sealing layer 120 expands.

[0069] In some embodiments, the elastic buffer portion 121 includes a plurality of interconnected pleats. The interconnected pleats can be understood as a corrugated structure. When the elastic buffer portion 121 is compressed, the pleats can unfold under the action of external force to meet the requirement of the sealing layer 120 undergoing annular expansion under pressure. When the elastic buffer portion 121 is not compressed, the pleats return to a folded state under the action of their own elasticity.

[0070] By providing various structural designs for the elastic buffer section 121, the appropriate extension structure can be selected according to the actual situation, thus meeting the usage requirements of different scenarios.

[0071] In some embodiments, such as Figure 1 and Figure 2 As shown, multiple slits 111 are evenly spaced along the circumferential direction, and the width b3 of the slits 111 satisfies 5mm≤b3≤10mm.

[0072] For example, multiple gaps 111 are evenly spaced along the circumferential direction of the concrete lining layer 110, which helps to improve the uniformity of the expansion of the concrete lining layer 110, and also helps to improve the uniformity of the expansion of the sealing layer 120, thereby improving the overall reliability.

[0073] The width b3 of the gap 111 can be understood as the width of the opening of the gap 111 near the sealing layer 120. The width b3 of the gap 111 can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, or any value between any two adjacent values ​​mentioned above.

[0074] By setting the width b3 of the gap 111 between 5mm and 10mm, the requirements for circumferential deformation release of the concrete lining layer 110 can be met, while also preventing the gap 111 from being too large and causing a reduction in the support strength of the concrete lining layer 110 to the sealing layer 120.

[0075] In some embodiments, the cushioning material 150 includes one or more of rubber, polyurethane, or epoxy resin.

[0076] The cushioning material 150 needs to meet the requirements of support and deformation. The cushioning material 150 can be a material that is resistant to high temperatures and aging, has a high elastic modulus, and a high Poisson's ratio. In some embodiments, the cushioning material 150 can be rubber. In some embodiments, the cushioning material 150 can be polyurethane. In some embodiments, the cushioning material 150 can be epoxy resin. In some embodiments, the cushioning material 150 can be a mixture of rubber, polyurethane, and epoxy resin.

[0077] Selecting the appropriate cushioning material 150 according to needs can help reduce costs and meet the usage requirements of different scenarios.

[0078] This application embodiment also provides a construction method 300 for a ring support structure 100 of an underground gas storage facility, such as... Figure 4 As shown. Construction method 300 includes:

[0079] Step S310: Pour a concrete lining layer on the excavated surrounding rock and leave gaps of a preset width along the circumferential direction.

[0080] Specifically, a concrete lining layer is poured onto the surrounding rock of the energy storage chamber after excavation and initial support. The number of concrete lining layers along the circumferential direction is determined based on mechanical calculations. For example, if the concrete lining layer is divided into 12 sections along the circumferential direction, then 12 gaps are reserved along the circumferential direction, with the width of each gap between 5mm and 10mm. For example, the width of all 12 gaps is set to 8mm.

[0081] Step S320: Connect the two ends of the isolation component along the width of the gap to the concrete lining layer to prevent the buffer material from leaking through the gap.

[0082] Specifically, spacers are installed between two adjacent concrete lining blocks to prevent the cushioning material from leaking through the gaps. The size of the spacers can be selected according to the actual situation; for example, the width of the spacers is 500mm.

[0083] In some embodiments, the isolation element may be installed at the opening of the gap 111 near the sealing layer 120, and the isolation element may be connected to the concrete lining layer by welding or chemical anchoring.

[0084] Step S330: Adhere the sealing layer to the concrete lining layer and ensure that the elastic buffer part of the sealing layer corresponds one-to-one with the gap.

[0085] Specifically, after the spacer is installed and fixed, a sealing layer is installed, ensuring it adheres as closely as possible to the concrete lining layer. The sealing layer can be a single, integral structure installed directly, or it can be assembled from multiple components. The specific method depends on the actual situation.

[0086] In some embodiments, the sealing layer includes a plurality of sub-seals, each of which is provided with an elastic buffer portion. The number of elastic buffer portions needs to correspond to the number of gaps. If the number of gaps is 12, then the number of sub-seals is also 12. Each sub-seal has an elastic buffer portion. The plurality of sub-seals are fixed sequentially on the concrete lining layer. Adjacent sub-seals can be connected by welding.

[0087] Step S340: Inject buffer material into the cavity between the elastic buffer section and the concrete lining layer.

[0088] Specifically, after the sealing layer is installed, the buffer material needs to be injected into the cavity between the elastic buffer part and the concrete lining layer. For example, grouting holes are set on the elastic buffer part, and the buffer material is injected into the cavity through the grouting holes to form a filling layer. After the buffer material is cured, the elastic buffer part forms a complete deformation compensation structure.

[0089] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An annular support structure for an underground gas storage reservoir, characterised in that, include: The concrete lining layer has multiple gaps spaced at intervals along the annular direction, and the plane containing the annular direction is perpendicular to the extension direction of the gas storage tank. The sealing layer is at least partially attached to the concrete lining layer, and the sealing layer is provided with elastic buffer portions along the circumferential direction that correspond one-to-one with the gaps; as well as The isolation element is connected to the concrete lining layer at both ends along the width direction of the gap; The elastic buffer portion protrudes away from the concrete lining layer and forms a receiving cavity with the concrete lining layer. The receiving cavity is used to receive the buffer material, and the isolation member is configured to prevent the buffer material from leaking through the gap.

2. The ring support structure of claim 1, wherein, The isolator is located at the opening on the side of the gap near the sealing layer, and the isolator is used to separate the receiving cavity from the gap.

3. The ring-shaped support structure according to claim 1 or 2, characterized in that, The width b1 of the isolation member and the opening width b2 of the elastic buffer portion toward the concrete lining layer satisfy b1≥b2.

4. The ring-shaped support structure according to claim 3, characterized in that, The isolation component is sealed to the concrete lining layer at both ends along the width of the gap, and the width b1 of the isolation component satisfies 400mm≤b1≤600mm.

5. The ring-shaped support structure according to claim 1 or 2, characterized in that, The sealing layer includes a plurality of sub-seals connected along the circumferential direction, and each sub-seal is provided with the elastic buffer portion.

6. The ring-shaped support structure according to claim 5, characterized in that, The sub-seal and the isolator are made of ferrous or alloy materials.

7. The ring-shaped support structure according to claim 1 or 2, characterized in that, The elastic buffer portion includes an arcuate area, or the elastic buffer portion includes multiple connected folds.

8. The ring-shaped support structure according to claim 1 or 2, characterized in that, The multiple slits are evenly spaced along the circumferential direction, and the width b3 of the slits satisfies 5mm≤b3≤10mm.

9. The ring-shaped support structure according to claim 1 or 2, characterized in that, The cushioning material includes one or more of rubber, polyurethane, or epoxy resin.

10. A construction method for a ring-shaped support structure of an underground gas storage facility, applicable to the ring-shaped support structure described in any one of claims 1-9, characterized in that, The construction method includes: The concrete lining layer is poured on the excavated surrounding rock, and gaps of a predetermined width are reserved at intervals along the circumferential direction. The isolation element is connected to the concrete lining layer at both ends along the width of the gap to prevent the buffer material from leaking through the gap; The sealing layer is bonded to the concrete lining layer, and the elastic buffer portion of the sealing layer corresponds one-to-one with the gap; Buffer material is injected into the cavity between the elastic buffer section and the concrete lining layer.

Images