Underground high-pressure container sealing layer structure and construction method

Abstract

The invention belongs to the technical field of building construction, and discloses an underground high-pressure container sealing layer structure and a construction method.The underground high-pressure container sealing layer structure comprises a supporting frame, a backfilling layer and a multi-piece type sealing layer; the sealing layer is arranged on the inner wall of the excavated cavern of the high-pressure container; the supporting frame is arranged between the sealing layer and the inner wall of the excavated cavern and used for supporting the sealing layer. And the backfill layer is filled between the inner wall of the excavated cavern and the sealing layer and is used for transmitting the pressure in the high-pressure container to the surrounding rock. Under the same geological condition, the material cost is reduced by more than 50% compared with that of a high-carbon steel or alloy steel sealing layer, and the engineering investment is greatly saved. Secondly, through the tile type sealing layer and the supporting frame, the sealing performance and the supporting performance of the sealing layer structure can be guaranteed, and the construction speed and the construction convenience can be improved; and meanwhile, the sealing layer structure supports precise maintenance, damaged parts can be rapidly replaced by locally heating and melting the adhesive, and the maintenance period is greatly shortened.

Description

Technical Field

[0001] The invention discloses a sealing layer structure of an underground high-pressure container and a construction method, belonging to the technical field of building construction. Background Art

[0002] With global climate change, pumped hydro and compressed gas storage technologies are rapidly developing to accelerate the transition to green, low-carbon energy. Pumped hydro typically uses underground pipes for water transmission, with a designed water head of up to a kilometer; compressed gas storage typically utilizes large-scale, sealed underground containers.

[0003] For underground tunnels used for pumped hydropower storage or underground gas storage facilities for compressed gas energy storage, sealing performance is crucial to the success of the project. Both these facilities are exposed to high internal pressures of fluids or gases. Traditional container seals are typically made of high-carbon steel or alloy steel.

[0004] However, as the pressure inside the container increases, existing technologies face the following defects: high cost: to withstand high pressure, thick steel plates or fiberglass linings are required, which greatly increases the cost; bulky structure: the high density of steel makes transportation and construction difficult; insufficient durability: high carbon steel / alloy steel has low ductility and is prone to fatigue damage under cyclic charging and discharging loads; and the existing sealing layer lacks an effective water-conducting structure, and external water pressure can easily cause structural instability. Summary of the Invention

[0005] The purpose of the present invention is to provide a sealing layer structure for an underground high-pressure vessel to address the technical problems of high cost, bulky structure, and insufficient durability of existing high-pressure vessel sealing layer structures. To achieve the above objectives, the present invention proposes an underground high-pressure vessel sealing layer structure and construction method. The specific scheme is as follows: An underground high-pressure container sealing layer structure, comprising: a support frame, a backfill layer and a multi-piece sealing layer; The sealing layer is arranged on the inner wall of the excavated cavity of the high-pressure container; The support frame is provided between the sealing layer and the inner wall of the excavated cavern, and is used to support the sealing layer; The backfill layer is filled between the inner wall of the excavated cavern and the sealing layer, and is used to transfer the pressure in the high-pressure container to the surrounding rock.

[0006] Preferably, the sealing layer is formed by splicing multiple tile-type aluminum alloy plates; An expansion joint of a first preset size is provided between adjacent tile-type aluminum alloy plates.

[0007] Preferably, the support frame includes a plurality of first direction frames and a plurality of second direction frames; The plurality of first direction frames are arranged along the main extension direction of the excavated cavern and are arranged at equal intervals along the circumference of the inner surface of the excavated cavern; The plurality of second direction frames are sequentially arranged at preset intervals along the main extension direction of the excavated cavern; The plurality of first direction frames and the plurality of second direction frames are cross-arranged in a grid shape. Preferably, a water-guiding blind ditch is provided in each first direction frame and each second direction frame; The water diversion blind ditch is used to divert external groundwater to the water collection well.

[0008] Preferably, intersections of the plurality of first direction frames and the plurality of second direction frames are connected by welding or bolts.

[0009] Preferably, the sealing layer is fixedly connected to the supporting frame.

[0010] Preferably, the sealing layer and the supporting frame are connected by adhesive bonding or welding.

[0011] Preferably, the tile-type aluminum alloy plate adopts 1XXX, 3XXX or 5XXX series aluminum alloy.

[0012] A construction method for an underground high-pressure container sealing layer structure, characterized by comprising the following steps: Step 1: excavate the surrounding rock of the cavern to form an excavated cavern; Step 2: Setting a support frame on the inner wall of the excavated cave; Step 3: Laying a sealing layer on the side of the support frame away from the inner wall of the excavated cave; Step 4: backfill concrete between the sealing layer and the inner wall of the excavated cave to form a backfill layer.

[0013] Preferably, the step three specifically includes: Cutting and producing a plurality of tile-shaped aluminum alloy plates of a second preset size; The plurality of tile-type aluminum alloy plates are laid on the side of the support frame away from the inner wall of the excavated cave to form a sealing layer.

[0014] Beneficial effects: The present invention adopts a tile-type sealing layer and a supporting frame made of aluminum alloy, which not only ensures structural sealing and supporting strength, but also has the following significant advantages: Outstanding cost-effectiveness: Under the same geological conditions, the material cost is reduced by more than 50% compared with traditional high-carbon steel or alloy steel sealing layers, significantly saving project investment; Efficient and convenient construction: The tile-type design significantly increases construction speed, and the tile-type structure facilitates transportation and on-site assembly; Accurate and efficient maintenance: Supports local repairs, and damaged parts can be quickly replaced by heating and melting the adhesive, greatly shortening the maintenance cycle; Excellent durability: Aluminum alloy material has excellent corrosion resistance and resistance to cyclic loads. Compared with steel, it can effectively extend the service life of the sealing layer in complex environments, reduce the frequency of maintenance caused by corrosion or fatigue cracking, and achieve significant comprehensive benefits throughout the life cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic cross-sectional view of a sealing layer structure in a surrounding rock environment according to an embodiment of the present invention; Figure 2 3D schematic diagram of the sealing layer structure in an embodiment of the present invention; Figure 3 Schematic diagram of a partial cross-section of the sealing layer structure in an embodiment of the present invention.

[0016] In the figure: 1. Tile-type aluminum alloy plate; 2. Concrete; 3. Surrounding rock; 4. Circumferential frame; 5. Axial frame; 6. Adhesive; 7. Expansion joint; 8. Water diversion blind ditch. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0018] Underground high-pressure vessels (HPVs) are underground containers capable of withstanding high pressures. They are widely used in compressed air energy storage, underground natural gas storage, pumped-storage power plants, and pressure pipes in ultra-high-head pumping stations. Their sealing structures must be able to withstand the internal high pressures. Existing materials such as thick steel plates and fiberglass reinforced plastics (FRP) are bulky, difficult to transport and construct, and lack durability. Furthermore, existing sealing layers lack effective water-conducting structures, making them susceptible to structural instability due to external water pressure.

[0019] In order to solve the above problems, the present invention proposes a sealing layer structure of an underground high-pressure container, comprising: a support frame, a backfill layer and a multi-piece sealing layer; The sealing layer is provided on the inner wall of the excavated cavity of the high-pressure vessel; The support frame is arranged between the sealing layer and the inner wall of the excavated cavern to support the sealing layer; The backfill layer is filled between the inner wall of the excavated cavern and the sealing layer, and is used to transfer the pressure in the high-pressure container to the surrounding rock 3.

[0020] Furthermore, the sealing layer is formed by splicing a plurality of tile-like aluminum alloy plates 1 ; and expansion joints 7 of a first preset size are provided between adjacent tile-like aluminum alloy plates 1 .

[0021] It's important to note that the size and curvature of the tile-shaped aluminum alloy plate 1 must be designed accordingly to the specific shape of the high-pressure vessel. For a tubular high-pressure vessel, for example, each aluminum alloy plate is machined into a tile-like shape with a specific curvature. Multiple tiles can be spliced ​​circumferentially to form a complete ring, thus forming a segment of the tubular vessel. For high-pressure vessels of other shapes (such as spherical vessels), the tile-shaped aluminum alloy plate 1 must be designed with a spherical curvature, with multiple tiles spliced ​​together to form a spherical sealing layer.

[0022] Since the high-pressure container needs to frequently charge and discharge the storage medium during use, in order to make the high-pressure container adapt to the cyclically changing temperature and pressure, its sealing layer structure needs to maintain sealing performance during the continuous deformation process. Therefore, a first preset size expansion joint 7 is provided between adjacent tile-type aluminum alloy plates 1. The first preset size is determined according to the fatigue damage effect of the tile-type aluminum alloy plate 1.

[0023] Furthermore, the tile-type aluminum alloy plate 1 adopts 1XXX, 3XXX or 5XXX series aluminum alloy.

[0024] Specifically, the tile-type aluminum alloy plate 1 of the present invention can adopt 1XXX, 3XXX or 5XXX series aluminum alloy, wherein the 1XXX series aluminum alloy is industrial pure aluminum with an aluminum content of not less than 99.00%, including 1050, 1060, 1100 and other series aluminum alloys; the 3XXX series aluminum alloy is an aluminum-manganese alloy with a manganese content between 1.0-1.5%, including 3003, 3004, 3A21 and other series aluminum alloys; the 5XXX series aluminum alloy is an aluminum-magnesium alloy with a magnesium content between 3-5%, including 5052, 5005, 5083, 5A05 and other series aluminum alloys.

[0025] Compared to high-carbon steel and alloy steel, the 1XXX, 3XXX, or 5XXX series aluminum alloys used in the present invention have higher ductility and can transfer more internal pressure to the surrounding rock 3 when bearing greater internal pressure. This allows the sealing layer of the present invention to be thinner and use less material under the same conditions. At the same time, aluminum alloy materials are lightweight and have a density of approximately 1 / 3 that of steel. Although their price is twice that of alloy steel, the unit price of aluminum alloy plates of the same thickness is only 0.7 to 0.8 times that of alloy steel, which has an advantage in price per unit volume. Because aluminum alloy materials have greater toughness and ductility than high-carbon steel and alloy steel, and the sealing layer is subjected to less pressure, the stress state remains in an elastic state, and therefore has a stronger ability to resist damage from inflation and deflation cycles.

[0026] In addition, since the high pressure generated by the medium inside the high-pressure container will act on the sealing layer, in order to prevent the sealing layer from deforming or failing due to local stress concentration, the sealing layer structure of the present invention also includes a support frame to disperse the load through a rigid structure and withstand the internal pressure.

[0027] Furthermore, the support frame includes a plurality of first direction frames and a plurality of second direction frames; A plurality of first direction frames are arranged along the main extension direction of the excavated cavern and are arranged at equal intervals along the circumference of the inner surface of the excavated cavern to form a first direction support; A plurality of second direction frames are sequentially arranged at preset intervals along the main extension direction of the excavated cavern to form a second direction support; The plurality of first direction frames and the plurality of second direction frames are cross-arranged in a grid shape.

[0028] Specifically, the geometric structure of the excavated cavern includes but is not limited to tubular, spherical, elliptical or other curved shells. When the excavated cavern, i.e., the corresponding high-pressure vessel, is a tubular or elliptical structure, its main extension direction is axial, the first direction frame is an axial frame, and the second direction frame is a circumferential frame. When the high-pressure vessel is a spherical structure, the main extension direction is defined as radial or any selected axial direction, and the first direction frame and the second direction frame are arranged according to the spherical longitude and latitude or a custom grid. It should be noted that, regardless of the geometric structure of the high-pressure vessel, the spacing and curvature of the multiple first direction frames and the multiple second direction frames of its support frame are adapted to the surface shape of the geometric structure to ensure support uniformity.

[0029] Specifically, in this embodiment, taking a tubular high-pressure vessel as an example, the support frame includes multiple axial frames 5 and multiple annular frames 4; the multiple axial frames 5 are arranged along the extension direction of the excavated chamber, and are arranged at equal intervals along the inner wall of the excavated chamber in a circumferential direction to form axial support; the multiple annular frames 4 are arranged in sequence at preset intervals along the extension direction of the excavated chamber to form annular support; the multiple axial frames 5 and the multiple annular frames 4 are arranged crosswise in a grid shape.

[0030] Specifically, in this embodiment, the annular frame 4 is specifically an annular rib made of aluminum alloy, and the axial frame 5 is specifically a linear rib made of aluminum alloy. The annular frame 4 and the axial frame 5 are arranged perpendicularly and crosswise to form a grid-like support frame. This support frame not only reduces fatigue damage to the sealing layer material by distributing the load, but also serves to resist external loads. Specifically, in underground environments, since the internal pressure of the high-pressure vessel is relatively low when not filled or discharged, it may be subject to pressure from the surrounding rock or groundwater. The support frame can increase the overall structural strength of the sealing layer structure and prevent the high-pressure vessel from deformation due to external pressure.

[0031] Specifically, the sealing layer is composed of multiple tile-like aluminum alloy plates 1. To prevent the sealing layer from being squeezed or shifted under high pressure, the support frame also provides support and secures the sealing layer. For example, during the operation of a high-pressure sealed container, the flow of high-pressure fluid or external vibrations may cause the sealing layer to loosen. The support frame effectively reduces the impact of dynamic loads on sealing performance by constraining the vibration transmission path.

[0032] Based on this, the sealing layer is fixedly connected to the support frame. The sealing layer and the support frame are bonded or welded by an adhesive 6.

[0033] Furthermore, intersections of the plurality of first direction frames 5 and the plurality of second direction frames 4 are connected by welding or bolts.

[0034] It is important to note that when arranging the first and second directional frames, the connections between the respective ribs should be avoided from overlapping their intersections to prevent local stress concentration and reduce the risk of structural weakness. In this embodiment, the sealing layer and the support frame are bonded using adhesive 6, using a heat-resistant structural adhesive such as epoxy resin, such as 3M DP420 or DP460. Specifically, adhesive 6 is applied to the outside of the sealing layer to bond it to the support frame.

[0035] Furthermore, in order to prevent the water pressure outside the high-pressure container from being too high and causing instability, a water-guiding blind ditch 8 is provided in each first direction frame 5 and each second direction frame 4; The water diversion blind ditch 8 is used to divert external groundwater to the water collection well.

[0036] Based on the above embodiments, the present invention provides a construction method for an underground high-pressure container sealing layer structure, characterized by comprising the following steps: Step 1: excavating the surrounding rock 3 of the cavern to form an excavated cavern; Step 2: Setting a support frame on the inner wall of the excavated cave; Step 3: Lay a sealing layer on the side of the support frame away from the inner wall of the cave chamber; specifically including: cutting and producing multiple tile-type aluminum alloy plates 1 of a second preset size; laying the multiple tile-type aluminum alloy plates 1 on the side of the support frame away from the inner wall of the cave chamber to form a sealing layer.

[0037] Step 4: Backfill concrete 2 between the sealing layer and the inner wall of the excavated cave to form a backfill layer.

[0038] After completing the above steps, it also includes pressure tests with media such as air or water, and flaw detection tests on welds and bonding parts, to verify whether the sealing layer structure is intact; so that it can maintain a closed structure when the medium is rushed into a high-pressure state; when the pressure is released, the support frame can bear the external groundwater pressure and divert the external groundwater to the collection well.

[0039] Under the same geological conditions, the material cost of the present invention is more than 50% lower than that of high-carbon steel or alloy steel sealing layers, which greatly saves project investment. Secondly, the tile-type sealing layer and supporting frame can not only ensure the sealing and support of the sealing layer structure, but also improve the construction speed and convenience; at the same time, the sealing layer structure of the present invention supports precise maintenance, and damaged parts can be quickly replaced by locally heating and melting the adhesive, greatly shortening the maintenance cycle. In addition, the aluminum alloy material itself has excellent corrosion resistance and resistance to cyclic loads. Compared with traditional steel materials, it can effectively extend the service life of the sealing layer in complex environments, reduce the frequency of maintenance due to corrosion or fatigue cracking, and have significant comprehensive benefits throughout the life cycle.

[0040] The above descriptions are merely several embodiments of the present invention and do not constitute any form of limitation to the present invention. Although the present invention is disclosed as above in terms of preferred embodiments, they are not intended to limit the present invention. Any technician familiar with the present profession who, without departing from the scope of the technical solution of the present invention, makes slight changes or modifications using the technical contents disclosed above are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. An underground high-pressure container sealing layer structure, characterized in that: include: Support frame, backfill layer and multi-piece sealing layer; The sealing layer is arranged on the inner wall of the excavated cavity of the high-pressure container; The support frame is provided between the sealing layer and the inner wall of the excavated cavern, and is used to support the sealing layer; The backfill layer is filled between the inner wall of the excavated cavern and the sealing layer, and is used to transfer the pressure in the high-pressure container to the surrounding rock.

2. The underground high-pressure container sealing layer structure according to claim 1, characterized in that: The sealing layer is composed of multiple tile-type aluminum alloy plates spliced ​​together; An expansion joint of a first preset size is provided between adjacent tile-type aluminum alloy plates.

3. The underground high-pressure container sealing layer structure according to claim 1, characterized in that: The support frame includes a plurality of first direction frames and a plurality of second direction frames; The plurality of first direction frames are arranged along the main extension direction of the excavated cavern and are arranged at equal intervals along the circumference of the inner surface of the excavated cavern; The plurality of second direction frames are sequentially arranged at preset intervals along the main extension direction of the excavated cavern; The plurality of first direction frames and the plurality of second direction frames are cross-arranged in a grid shape.

4. The underground high-pressure container sealing layer structure according to claim 3, characterized in that: Each first direction frame and each second direction frame is provided with a water guide blind ditch; The water diversion blind ditch is used to divert external groundwater to the water collection well.

5. The underground high-pressure container sealing layer structure according to claim 3, characterized in that: Intersections of the plurality of first direction frames and the plurality of second direction frames are connected by welding or bolts.

6. The underground high-pressure container sealing layer structure according to claim 1, characterized in that: The sealing layer is fixedly connected to the supporting frame.

7. The underground high-pressure container sealing layer structure according to claim 6, characterized in that: The sealing layer is connected to the supporting frame by bonding with an adhesive or welding.

8. The underground high-pressure container sealing layer structure according to claim 2, characterized in that: The tile-type aluminum alloy plate adopts 1XXX, 3XXX or 5XXX series aluminum alloy.

9. A construction method for the underground high-pressure container sealing layer structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: excavate the surrounding rock of the cavern to form an excavated cavern; Step 2: Setting a support frame on the inner wall of the excavated cave; Step 3: Laying a sealing layer on the side of the support frame away from the inner wall of the excavated cave; Step 4: backfill concrete between the sealing layer and the inner wall of the excavated cave to form a backfill layer.

10. The construction method of the underground high-pressure container sealing layer structure according to claim 9, characterized in that: The step three specifically includes: Cutting and producing a plurality of tile-shaped aluminum alloy plates of a second preset size; The plurality of tile-type aluminum alloy plates are laid on the side of the support frame away from the inner wall of the excavated cave to form a sealing layer.

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