Underground large-scale hydrogen storage warehouse structure and construction method thereof

Abstract

The invention relates to an underground large-scale hydrogen storage warehouse structure and a construction method thereof.The underground large-scale hydrogen storage warehouse structure comprises a warehouse body, a sealing structure and a sealing device, the warehouse body is used for being arranged underground and comprises a concrete lining layer and a concrete bottom plate, and the concrete lining layer is provided with a cavity with the upper end open and the lower end open; the concrete bottom plate is arranged at the bottom of the concrete lining layer to block the lower end of the cavity; the sealing structure is laid on the inner side of the cavity and used for sealing the cavity. And the sealing device is arranged at the top of the concrete lining layer and is in sealed connection with the upper end of the cavity, the sealing device and the warehouse body jointly define a hydrogen storage space, and the sealing device is further provided with an inflation and deflation channel communicating with the hydrogen storage space. The device can be pre-buried under various landforms to form the hydrogen storage bank, the hydrogen storage bank structure is located underground, the advantage that underground temperature, humidity and other environmental factors are stable can be utilized, safe storage is achieved, and meanwhile the surrounding rock and soil body can provide a natural enclosure effect.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen storage, and particularly to an underground large-scale hydrogen storage reservoir structure and a construction method thereof. Background Art

[0002] Hydrogen energy is recognized as one of the cleanest energy sources with the most promising development prospects in the 21st century. All energy industries are vigorously promoting transformation and upgrading. For example, the coal chemical industry is making great efforts in technological transformation to achieve the carbon reduction goal. It has carried out clean energy power generation for hydrogen production and adopted green hydrogen for olefin production; the electric power energy industry uses domestic "abandoned wind and electricity" and valley electricity for electrolytic water hydrogen production; the transportation and logistics industry promotes the construction of hydrogen refueling stations, etc. The increasing demand for various hydrogen energy applications has put forward higher requirements for the safe and efficient storage of hydrogen energy.

[0003] Patent CN219139138U discloses an underground hydrogen storage device, which includes a hydrogen storage rock cave for storing hydrogen, and the hydrogen storage rock cave is located in an underground rock formation; a sealing lining layer is provided on the inner wall of the hydrogen storage rock cave, and the sealing lining layer includes a sealing inner lining layer and a lining layer arranged in sequence from inside to outside. The sealing inner lining layer can seal the hydrogen in the hydrogen storage rock cave, and the lining layer is located between the sealing inner lining layer and the inner wall of the hydrogen storage rock cave and can fix the sealing inner lining layer.

[0004] However, the hydrogen storage rock cave of the above prior art needs to meet special geological conditions to meet the hydrogen storage requirements and cannot be applied to various landforms. Summary of the Invention

[0005] In view of this, it is necessary to provide an underground large-scale hydrogen storage reservoir structure to solve the technical problem that the hydrogen storage rock cave in the prior art needs to meet special geological conditions to meet the hydrogen storage requirements and cannot be applied to various landforms.

[0006] The present invention provides an underground large-scale hydrogen storage reservoir structure, which includes:

[0007] A reservoir body for being arranged underground. The reservoir body includes a concrete lining layer and a concrete bottom plate. The concrete lining layer has a cavity with openings at both upper and lower ends, and the concrete bottom plate is arranged at the bottom of the concrete lining layer to seal the lower end of the cavity;

[0008] A sealing structure laid on the inner side of the cavity for sealing the cavity; and

[0009] A sealing device arranged at the top of the concrete lining layer and hermetically connected to the upper end of the cavity. The sealing device and the reservoir body jointly enclose a hydrogen storage space, and the sealing device is also provided with a gas charging and discharging channel communicating with the hydrogen storage space.

[0010] In some embodiments, the concrete lining layer includes a plurality of tube structures, and the plurality of tube structures are connected in sequence along the vertical direction, and a connecting structure is provided between two adjacent tube structures, and the connecting structure includes a tenon and a tenon groove that cooperate with each other, wherein the tenon is provided at the tube structure located on the upper side of the two tube structures, and the tenon groove is provided at the tube structure located on the lower side of the two tube structures.

[0011] In some embodiments, the pipe body structure includes a plurality of prefabricated pipe segments and a plurality of prestressed tendons. The prefabricated pipe segments are arranged in an arc shape, and the plurality of prefabricated pipe segments are connected in sequence along the circumferential direction. Each of the prefabricated pipe segments is penetrated by a prestressed tendon channel along its circumference. Grooves are provided on the outer sides of both ends of the prefabricated pipe segments, and the grooves are connected to the prestressed tendon channels. Each prestressed tendon is passed through two adjacent prestressed tendon channels. Both ends of the prestressed tendon are fixed to the side walls of the groove by anchors, and the prestressed tendon is used to fix the two adjacent prefabricated pipe segments.

[0012] In some embodiments, the sealing device is further provided with an opening communicating with the hydrogen storage space;

[0013] The underground large-scale hydrogen storage structure also includes a sealing door structure, which is arranged at the opening and is used to open and close the opening.

[0014] In some embodiments, the sealing door structure includes a door frame, a sealing door, a driving mechanism and a sealing ring. The door frame is arranged on the peripheral side of the opening, and a sealing groove is provided on the circumference of the door frame. One end of the sealing door is rotatably installed on one side of the door frame along an axis in the horizontal direction. The driving mechanism is connected to the sealing door and is used to drive the sealing door to rotate. The sealing ring is arranged in the sealing groove so that when the sealing door closes the opening, the sealing door partially extends into the sealing groove and abuts against the sealing ring.

[0015] In some embodiments, a rotating shaft hole is provided on one side of the door frame, and a rotating shaft is provided on one end of the sealed door, and the rotating shaft is rotatably installed in the rotating shaft hole;

[0016] The driving mechanism includes a first gear, a second gear and a driving motor. The first gear is rotatably mounted on the door frame, the second gear is fixedly mounted on the rotating shaft, the first gear and the second gear are meshed, and the driving motor is connected to the first gear for driving the first gear to rotate.

[0017] In some embodiments, the sealing structure includes a sliding buffer layer and a hydrogen barrier sealing layer, the sliding buffer layer is adhered to the inner surface of the cavity by epoxy resin glue, and the hydrogen barrier sealing layer is adhered to the hydrogen-facing side of the sliding buffer layer by epoxy resin glue;

[0018] Among them, the sliding buffer layer is made of polyurethane with a thickness of 10 - 50 mm; the hydrogen-blocking sealing layer is a polyvinyl alcohol film with a thickness of 3 - 10 mm; the epoxy resin adhesive uses a bisphenol A epoxy resin matrix and is compounded with 5% by mass of alumina and 5% by mass of boron nitride nanosheets.

[0019] In some embodiments, a plurality of uplift composite anchor piles are provided at the bottom of the concrete floor slab and the bottom of the sealing device, and the uplift composite anchor piles are used to be embedded underground to fix the concrete floor slab and the sealing device.

[0020] In some embodiments, the sealing device is a reinforced concrete structure, and the cross-sectional area of the sealing device is larger than the cross-sectional area of the concrete lining layer.

[0021] In addition, the present invention also provides a construction method for an underground large-scale hydrogen storage tank structure, which includes the following steps:

[0022] Fabricate precast segments and a sealing device, and fabricate a pipe body structure with the precast segments.

[0023] Level the site, excavate a guide trench, and set multiple groups of dewatering wells around the concrete lining layer to lower the groundwater level, and use the dewatering wells to fabricate uplift composite anchor piles.

[0024] Sink the pipe body structure, and sequentially join the pipe body structures to form a concrete lining layer.

[0025] Set multiple groups of dewatering wells at the bottom of the concrete lining layer to lower the groundwater level, and use the dewatering wells to fabricate uplift composite anchor piles, and pour a concrete floor slab so that the concrete floor slab and the uplift composite anchor piles form an integral body.

[0026] Paste a sealing structure on the inner sides of the concrete lining layer and the concrete floor slab.

[0027] Set multiple groups of dewatering wells around the top periphery of the concrete lining layer to lower the groundwater level, and use the dewatering wells to fabricate uplift composite anchor piles.

[0028] Install the sealing device on the top of the concrete lining layer, and fix the sealing device to the uplift composite anchor piles to form the entire hydrogen storage tank structure.

[0029] Compared with the prior art, the underground large-scale hydrogen storage tank structure provided by the present invention has a tank body including a concrete lining layer and a concrete bottom plate. The concrete lining layer has a cavity with openings at both the upper and lower ends. The concrete bottom plate is arranged at the bottom of the concrete lining layer to seal the lower end of the cavity. The sealing structure is laid on the inner side of the cavity for sealing the cavity. The sealing device is arranged at the top of the concrete lining layer and is hermetically connected to the upper end of the cavity. The sealing device and the tank body jointly enclose a hydrogen storage space. The sealing device is also provided with a gas charging and discharging channel communicating with the hydrogen storage space. The tank body made of the concrete lining layer and the concrete bottom plate can ignore the landform and can be pre-buried under various landforms to form a hydrogen storage tank. The hydrogen storage tank structure is located underground, and the advantages of relatively stable environmental factors such as underground temperature and humidity can be utilized to achieve safe storage. At the same time, the surrounding rock and soil mass can provide a natural enclosure effect, improving the safety and reliability of the hydrogen storage tank structure.

[0030] The above description is only an overview of the technical solution of the present invention. In order to be able to more clearly understand the technical means of the present invention and to be implemented in accordance with the content of the description, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The specific implementation manners of the present invention are given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention and form a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 is a schematic structural diagram of an embodiment of the underground large-scale hydrogen storage tank structure provided by the present invention;

[0033] Figure 2 is Figure 1 a top view of the pipe body structure in

[0034] Figure 3 is Figure 1 a three-dimensional schematic diagram of the precast segment in

[0035] Figure 4 is Figure 1 a three-dimensional schematic diagram of the sealing door structure in

[0036] Figure 5 is Figure 1 a top view of the sealing door structure in

[0037] Figure 6 is Figure 1 a front view of the anti-pulling anchor rod and the filter pipe in

[0038] Figure 7 isFigure 1 Schematic three-dimensional diagram of the medium anti-pulling anchor rod and the filter pipe;

[0039] Figure 8 is Figure 1 Partial schematic diagram of the medium anti-pulling anchor rod;

[0040] Figure 9 is Figure 1 Schematic diagram of the construction process of the medium anti-pulling composite anchor rod pile.

[0041] Explanation of reference numerals:

[0042] 1 - Concrete lining layer, 11 - Pipe body structure, 111 - Prefabricated segment, 1111 - Groove, 1112 - Prestressed tendon duct, 112 - Prestressed tendon;

[0043] 2 - Concrete bottom slab;

[0044] 3 - Sealing structure, 31 - Sliding buffer layer, 32 - Hydrogen-blocking sealing layer;

[0045] 4 - Sealing device, 41 - Inflation and deflation channel;

[0046] 5 - Sealing door structure, 51 - Door frame, 52 - Sealing door, 521 - Rotating shaft, 53 - Driving mechanism, 531 - First gear, 532 - Second gear, 533 - Driving motor, 54 - Sealing ring;

[0047] 6 - Anti-pulling composite anchor rod pile, 61 - Anti-pulling anchor rod, 611 - Conical end plate;

[0048] 7 - Filter pipe;

[0049] 8 - Filter material. Detailed implementation manners

[0050] The following will specifically describe the preferred embodiments of the present invention with reference to the accompanying drawings. The accompanying drawings form a part of this application and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0051] Please refer to Figure 1, The underground large-scale hydrogen storage tank structure includes a tank body, a sealing structure 3 and a sealing device 4. The tank body is used to be arranged underground. The tank body includes a concrete lining layer 1 and a concrete bottom plate 2. The concrete lining layer 1 has a cavity with openings at both the upper and lower ends. The concrete bottom plate 2 is arranged at the bottom of the concrete lining layer 1 to seal the lower end of the cavity. The sealing structure 3 is laid on the inner side of the cavity for sealing the cavity. The sealing device 4 is arranged at the top of the concrete lining layer 1 and is hermetically connected to the upper end of the cavity. The sealing device 4 and the tank body jointly enclose a hydrogen storage space. The sealing device 4 is also provided with a gas charging and discharging channel 41 communicating with the hydrogen storage space.

[0052] For the underground large-scale hydrogen storage tank structure provided by the present invention, the tank body includes a concrete lining layer 1 and a concrete bottom plate 2. The concrete lining layer 1 has a cavity with openings at both the upper and lower ends. The concrete bottom plate 2 is arranged at the bottom of the concrete lining layer 1 to seal the lower end of the cavity. The sealing structure 3 is laid on the inner side of the cavity for sealing the cavity. The sealing device 4 is arranged at the top of the concrete lining layer 1 and is hermetically connected to the upper end of the cavity. The sealing device 4 and the tank body jointly enclose a hydrogen storage space. The sealing device 4 is also provided with a gas charging and discharging channel 41 communicating with the hydrogen storage space. The tank body made of the concrete lining layer 1 and the concrete bottom plate 2 can ignore the landform and can be pre-buried under various landforms to form a hydrogen storage tank. Since the hydrogen storage tank structure is located underground, the advantages of relatively stable environmental factors such as underground temperature and humidity can be utilized to achieve safe storage. At the same time, the surrounding rock and soil can provide a natural enclosure effect, improving the safety and reliability of the hydrogen storage tank structure.

[0053] Further, please refer to Figures 1 to 3In this embodiment, the concrete lining layer 1 includes a plurality of pipe body structures 11, and the plurality of pipe body structures 11 are connected in sequence along the vertical direction, and a connecting structure is provided between two adjacent pipe body structures 11, and the connecting structure includes a tenon and a tenon groove that cooperate with each other, wherein the tenon is provided at the pipe body structure 11 located on the upper side of the two pipe body structures 11, and the tenon groove is provided at the pipe body structure 11 located on the lower side of the two pipe body structures 11. Specifically, the tube body structure 11 is generally annular, and a plurality of the tube body structures 11 are spliced in sequence along the vertical direction to form the main structure of the concrete lining layer 1, and a tenon is provided on the lower end face of each of the tube body structures 11, and a tenon groove is provided on the upper end face of each of the tube body structures 11, and the tenon and the tenon groove cooperate with each other, so as to limit the circumference of the tube body structure 11 and prevent the tube body structure 11 from moving in the horizontal direction, wherein, since the top and bottom of the plurality of tube body structures 11 do not require mortise and tenon cooperation, the topmost tube body structure 11 among the plurality of tube body structures 11 has no tenon groove, and the bottommost tube body structure 11 among the plurality of tube body structures 11 has no tenon.

[0054] Furthermore, an asphalt layer is laid in the tongue and groove, and the structural integrity can be enhanced by providing the asphalt layer.

[0055] For further information, see Figure 3 In this embodiment, the specific composition of the pipe body structure 11 is not limited. In this embodiment, the pipe body structure 11 includes a plurality of prefabricated pipe segments 111 and a plurality of prestressed tendons 112. The prefabricated pipe segments 111 are arranged in an arc shape. The plurality of prefabricated pipe segments 111 are connected in sequence along the circumferential direction. Each of the prefabricated pipe segments 111 is penetrated by a prestressed tendon 112 channel 1112 along its circumferential direction. Grooves 1111 are provided on the outer sides of both ends of the prefabricated pipe segments 111. The grooves 1111 are connected to the prestressed tendon 112 channels 1112. Each prestressed tendon 112 is penetrated in two adjacent prestressed tendon 112 channels 1112. Both ends of the prestressed tendon 112 are fixed to the side walls of the groove 1111 by anchors. The prestressed tendon 112 is used to fix the two adjacent prefabricated pipe segments 111. A plurality of prefabricated segments 111 are spliced circumferentially to form an annular structure, and then the prestressed tendons 112 are connected and fixed in pairs, thereby fixing the entire pipe structure 11. The grooves 1111 are provided to facilitate the anchor to fix the prestressed tendons 112.

[0056] Specifically, an arc-shaped groove is provided on the top of each prefabricated pipe segment 111, and an arc-shaped protrusion is provided on the bottom of the prefabricated pipe segment 111. A plurality of arc-shaped grooves are together enclosed to form the mortise and tenon, and a plurality of arc-shaped protrusions are together enclosed to form the tenon.

[0057] Specifically, in this embodiment, there are four precast segments 111, and there are also four prestressed tendons 112.

[0058] Furthermore, in order to improve the connection strength between two adjacent precast segments 111, there are two ducts 1112 for the prestressed tendons 112. The two ducts 1112 for the prestressed tendons 112 are arranged at intervals in the vertical direction. That is, each duct 1112 for the prestressed tendon 112 is penetrated by the prestressed tendon 112. The two adjacent precast segments 111 are connected by the two prestressed tendons 112, thereby enhancing their connection strength.

[0059] Furthermore, in order to improve the waterproof effect, in this embodiment, a slow-swell water-swellable waterstop strip is also embedded in the splicing joint between two adjacent precast segments 111. With such a setting, the waterproof effect can be improved.

[0060] Furthermore, in order to facilitate the later maintenance of the interior of the reservoir body, in this embodiment, the sealing device 4 is also provided with an opening communicating with the hydrogen storage space; the underground large-scale hydrogen storage reservoir structure further includes a sealing door 52 structure 5. The sealing door 52 structure 5 is arranged at the opening for opening and closing the opening. By providing the opening, it is convenient for personnel to enter the reservoir body for maintenance later, and the sealing door 52 structure 5 can seal the opening during hydrogen storage.

[0061] Furthermore, please refer to Figures 4 to 5 , in this embodiment, the sealing door 52 structure 5 includes a door frame 51, a sealing door 52, a driving mechanism 53 and a sealing ring 54. The door frame 51 is arranged on the periphery of the opening, and a sealing groove is provided on the circumference of the door frame 51; one end of the sealing door 52 is rotatably installed on one side of the door frame 51 along the axis in the horizontal direction. The driving mechanism 53 is connected to the sealing door 52 for driving the sealing door 52 to rotate. The sealing ring 54 is arranged in the sealing groove so that when the sealing door 52 closes the opening, a part of the sealing door 52 extends into the sealing groove and abuts against the sealing ring 54.

[0062] Furthermore, in order to improve the connection strength between the door frame 51 and the sealing device 4, in this embodiment, connecting pieces are provided around the door frame 51, and the connecting pieces are arranged inside the sealing device 4. With such a setting, the connection strength between the door frame 51 and the sealing device 4 can be enhanced.

[0063] Furthermore, please refer to Figures 4 to 5, a rotating shaft 521 hole is provided on one side of the door frame 51, a rotating shaft 521 is provided at one end of the sealing door 52, and the rotating shaft 521 is rotatably installed in the rotating shaft 521 hole; the driving mechanism 53 includes a first gear 531, a second gear 532 and a driving motor 533. The first gear 531 is rotatably installed on the door frame 51, the second gear 532 is fixedly installed on the rotating shaft 521, the first gear 531 and the second gear 532 are meshed, and the driving motor 533 is connected to the first gear 531 for driving the first gear 531 to rotate. Specifically, the sealing door 52 is integrally semicircular, the rotating shaft 521 is provided at the straight end of the sealing door 52, protrusions are formed by convexly protruding at both opposite ends of the door frame 51, and each protrusion is provided with the rotating shaft 521 hole. The rotating shaft 521 is located between the two rotating shaft 521 holes, and both ends of the rotating shaft 521 are rotatably installed in the rotating shaft 521 hole through bearing parts. Among them, one end of the rotating shaft 521 extends out of the rotating shaft 521 hole and is fixedly connected to the second gear 532. Since the first gear 531 and the second gear 532 are meshed, when the driving motor 533 drives the first gear 531 to rotate, the rotating shaft 521 can be driven to rotate, and then the sealing door 52 can be driven to rotate to achieve the purpose of opening and closing the opening. And when the sealing door 52 closes the opening, a part of the sealing door 52 can extend into the sealing groove and abut against the sealing ring 54, so as to achieve a better sealing effect.

[0064] Further, please refer to Figure 1 , in this embodiment, the sealing structure 3 includes a sliding buffer layer 31 and a hydrogen-blocking sealing layer 32. The sliding buffer layer 31 is pasted on the inner surface of the cavity through epoxy resin glue, and the hydrogen-blocking sealing layer 32 is pasted on the hydrogen-facing side of the sliding buffer layer 31; wherein, the sliding buffer layer 31 is polyurethane with a thickness of 10-50 mm; the hydrogen-blocking sealing layer 32 is a polyvinyl alcohol film with a thickness of 3-10 mm; the epoxy resin glue uses a bisphenol A epoxy resin matrix and is compounded with 5% by mass of alumina and 5% by mass of boron nitride nanosheets.

[0065] Further, please refer to Figure 1 , Figure 6 and Figure 9, in this embodiment, a plurality of anti-pulling composite anchor piles 6 are provided at the bottom of the concrete floor slab 2 and the bottom of the sealing device 4, and the anti-pulling composite anchor piles 6 are used to embed into the ground to fix the concrete floor slab 2 and the sealing device 4. Specifically, before pouring the concrete floor slab 2, a plurality of dewatering wells are first arranged at the bottom of the foundation pit, an anti-pulling anchor 61 and a filter pipe 7 are inserted in the middle of the dewatering well, a plurality of water filtering holes are provided on the circumference of the filter pipe 7, and then a filter material 8 is filled in the gap between the anti-pulling anchor 61 and the filter pipe 7 and the dewatering well. By arranging the filter pipe 7, the groundwater can flow through the filter material 8 into the filter pipe 7, and then the groundwater in the filter pipe 7 is pumped away by a water pump, so as to achieve the purpose of lowering the groundwater level. After the dewatering is completed, the filter pipe 7 is taken out, and cement slurry is injected into the holes left by the filter pipe 7 to form an anti-pulling composite anchor pile 6 with the anti-pulling anchor 61. Similarly, when the sealing device 4 is installed, the same construction method is adopted, which will not be elaborated here.

[0066] Further, the filter material 8 is medium-coarse sand with a particle size of 2 mm to 5 mm.

[0067] Further, for the convenience of installing the anti-pulling anchor 61 and the filter pipe 7, please refer to Figures 7 to 8 , in this embodiment, a plurality of fixing rings with diameters matching the diameter of the anti-pulling anchor 61 are provided on the outer side of the filter pipe 7, and the plurality of fixing rings are arranged at intervals in the vertical direction, and the anti-pulling anchor 61 passes through the plurality of fixing rings.

[0068] Further, the anti-pulling anchor 61 is a prestressed steel strand or a high-strength steel bar.

[0069] Further, please refer to Figures 7 to 8 , an end of the lower end of the anti-pulling anchor 61 is provided with a tapered end plate 611, and a positioning card slot is provided on the surface of the tapered end plate 611, and the lower end of the filter pipe 7 is embedded in the positioning card slot.

[0070] Further, the plurality of water filtering holes are arranged in a multi-row spiral pattern, and a filter screen is wrapped outside the filter pipe 7, and the filter screen is used for filtering.

[0071] Further, please refer to Figure 1 , in this embodiment, the sealing device 4 is a reinforced concrete structure, and the cross-sectional area of the sealing device 4 is larger than the cross-sectional area of the concrete lining layer 1. Such a setting facilitates the arrangement of the anti-pulling composite anchor piles 6 at the bottom of the sealing device 4 and avoids interference between the anti-pulling composite anchor piles 6 and the concrete lining layer.

[0072] Further, there is no limitation on the connection method between the sealing device 4 and the anti-pulling composite anchor pile 6. In this embodiment, a plurality of anchoring grooves are provided on the circumference of the sealing device 4. One end of the anti-pulling anchor 61 is fixed in the anchoring groove through an anchor, and the other end passes through the sealing device 4 and extends into the ground. After the tensioning of the anti-pulling anchor 61 is completed, the anchoring groove is filled and leveled with slightly expanding concrete.

[0073] In addition, the present invention also provides a construction method for an underground large-scale hydrogen storage tank structure, which includes the following steps:

[0074] S1. Fabricate precast segments 111 and the sealing device 4, and fabricate the pipe body structure 11 through the precast segments 111.

[0075] Specifically, for the fabrication of the precast segments 111: According to the design drawings, carry out the steel bar cutting and binding work of the precast segments 111 to complete the fabrication of the precast segment 111 steel bar cage; then process and install the wooden formwork, and reserve the ducts 1112 for the prestressing tendons 112, grooves 1111, arc-shaped protrusions and arc-shaped grooves of the precast segments 111. Finally, carry out the concrete pouring for the precast segments 111, vibrate thoroughly and sprinkle water for curing.

[0076] Fabrication of the sealing device 4: According to the design drawings, carry out the steel bar cutting and binding work of the sealing device 4 to complete the fabrication of the sealing device 4 steel bar cage. Then process and install the wooden formwork, install the seal door 52 structure 5 at the corresponding position of the sealing device 4 and reserve the anchoring grooves. Finally, carry out the concrete pouring for the sealing device 4, vibrate thoroughly and sprinkle water for curing.

[0077] Fabrication of the pipe body structure 11: The precast segments 111 are spliced in pairs in the circumferential direction and fixed by the prestressing tendons 112 passing through both of them to form a cylindrical pipe body structure 11. After the tensioning of the prestressing tendons 112 is completed, the grooves 1111 are filled and leveled with slightly expanding concrete.

[0078] S2. Level the site, excavate the guide ditch, and set up multiple groups of dewatering wells outside the concrete lining layer to lower the groundwater, and use the dewatering wells to fabricate the anti-pulling composite anchor piles 6.

[0079] Specifically, level the site, locate the construction axis of the pipe body structure 11, excavate the guide ditch, set up multiple groups of dewatering wells outside the concrete lining layer 1 to lower the groundwater, use a drilling rig to construct the well holes of the dewatering wells. After the well hole construction is completed, lower the anti-pulling anchors 61 and the filter pipes 7, then put in the filter material 8 to filter impurities, install the water extraction pipes and water extraction pumps for dewatering.

[0080] S3. Sink the pipe body structure 11, and splice the pipe body structures 11 in sequence to form the concrete lining layer.

[0081] Specifically, excavate the soil inside the pipe body structure 11, slowly lower the pipe body structure 11, and apply an asphalt layer on the surface of the mortise groove of the pipe body structure 11. The pipe body structure 11 is spliced and positioned along the vertical direction through the tenon and mortise groove, and finally a concrete lining layer 1 is formed.

[0082] S4. Set multiple groups of dewatering wells at the bottom of the concrete lining layer 1 to lower the groundwater level, and use the dewatering wells to fabricate anti-pull composite anchor piles 6, and pour the concrete floor slab 2 so that the concrete floor slab 2 and the anti-pull composite anchor piles 6 form an integral whole;

[0083] Specifically, set multiple groups of dewatering wells at the bottom of the concrete lining layer 1 to lower the groundwater level. Use a drilling rig to construct the well holes of the dewatering wells. After the well hole construction is completed, lower the anti-pull anchor 61 and the filter pipe 7, then put in the filter material 8 to filter impurities, install the water extraction pipe and the water extraction pump for dewatering. After the dewatering is completed, pull out the filter pipe 7. Use a grouting machine to inject cement slurry under pressure into the pores left after pulling out the filter pipe 7. Then tension the anti-pull anchor 61 and anchor it with an anchor to form the anti-pull composite anchor pile 6. Finally, pour the concrete floor slab 2 to form an integral whole.

[0084] S5. Paste the sealing structure 3 on the inner sides of the concrete lining layer 1 and the concrete floor slab 2;

[0085] Specifically, grind and clean the inner side of the concrete lining layer 1, apply epoxy resin glue to paste and fix the sliding buffer layer 31, and then paste and fix the hydrogen-blocking sealing layer 32 through epoxy resin glue.

[0086] S6. Set multiple groups of dewatering wells around the top of the concrete lining layer 1 to lower the groundwater level, and use the dewatering wells to fabricate anti-pull composite anchor piles 6;

[0087] Level the site. At the position where the sealing device 4 is installed on the open surface of the hydrogen storage tank structure, set multiple groups of dewatering wells around the sealing device 4 to lower the groundwater level. Use a drilling rig to construct the well holes of the dewatering wells. After the well hole construction is completed, lower the anti-pull anchor 61 and the filter pipe 7, then put in the filter material 8 to filter impurities, install the water extraction pipe and the water extraction pump for dewatering. After the dewatering is completed, pull out the filter pipe 7. Use a grouting machine to inject cement slurry under pressure into the pores left after pulling out the filter pipe 7. Then tension the anti-pull anchor 61 and anchor it with an anchor to form the anti-pull composite anchor pile 6. Then use slightly expanded concrete to fill and level the anchoring groove.

[0088] S7. Install the sealing device 4 on the top of the concrete lining layer 1 and fix the sealing device 4 to the anti-pull composite anchor piles 6 to form the entire hydrogen storage tank structure.

[0089] In the present invention, the hydrogen storage tank structure is located underground, and the advantages of relatively stable environmental factors such as underground temperature and humidity can be utilized to achieve safe storage. At the same time, the surrounding rock and soil can provide a natural enclosure effect, improving the safety and reliability of the hydrogen storage tank structure.

[0090] The hydrogen storage tank structure in the present invention is an assembled structure, which is manufactured in a factory with industrialized and streamlined production, and the quality is stable and controllable. At the same time, prestress is applied through the unbonded prestressing tendons 112 to improve the stiffness of the components, so as to offset or reduce the internal force generated by hydrogen, enhance the safety and stability of the structure. At the same time, the connection method of mortise and tenon structure is adopted, which can effectively prevent the horizontal mutual sliding and separation of the two at the interface of the pipe body structure 11, making the concrete lining layer 1 work as a whole. And an asphalt layer is added at the mortise and tenon structure bite, which can play a waterproof role while enhancing the integrity, improving the durability of the structure.

[0091] In the present invention, the hydrogen storage tank structure is structurally reinforced by the uplift anchor rod 61. The bottom of the uplift anchor rod 61 is provided with a tapered end plate 611. When the uplift anchor rod 61 is subjected to a pulling force, in addition to the side friction of the uplift anchor rod 61 playing an uplift role, the resistance of the tapered end plate 611 will also play an uplift role, so as to improve the stability of the uplift anchor rod 61, solve the problem that the anchor rod cannot bear a large tensile stress, and effectively prevent the sealing device 4 from being ejected during the cyclic injection and extraction of hydrogen, resulting in a safety accident.

[0092] The uplift anchor rod 61 and the filter pipe 7 in the present invention are lowered into the precipitation well together. After the precipitation is completed, the filter pipe 7 is pulled out. The pores formed after the filter pipe 7 is pulled out can be filled with cement slurry. The cement slurry solidifies after infiltrating into the pores of the filter material 8, effectively connecting the uplift anchor rod 61 and the cement pile into one body, making it also serve as the uplift composite anchor rod pile 6 during the project operation period, thereby reducing the investment in uplift measures and greatly saving the construction period and project cost.

[0093] The hydrogen storage tank structure in the present invention has strong on-site construction operability, high component assembly degree, high operation efficiency, excellent waterproof ability, good overall performance and construction quality of the structure. At the same time, the precipitation well is also used as the uplift composite anchor rod pile 6, with strong uplift ability and low project cost, energy-saving and environmental protection, and has strong promotion and application value.

[0094] The hydrogen storage tank structure in the present invention can realize large-scale hydrogen storage, make up for the weak short board of hydrogen storage in the hydrogen energy industry, and promote the rapid development of China's hydrogen energy industry.

[0095] In the description of the present application, it should be noted that if there are directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" 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. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0096] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device including the said element. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0097] As described above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. An underground large-scale hydrogen storage structure, characterized in that, It includes: A library body, which is used to be arranged underground. The library body includes a concrete lining layer and a concrete bottom plate. The concrete lining layer has a cavity with openings at both the upper and lower ends. The concrete bottom plate is arranged at the bottom of the concrete lining layer to seal the lower end of the cavity. A sealing structure, which is laid on the inner side of the cavity and is used to seal the cavity. And A sealing device, which is arranged at the top of the concrete lining layer and is hermetically connected to the upper end of the cavity. The sealing device and the library body jointly enclose a hydrogen storage space. The sealing device is also provided with a gas charging and discharging channel communicating with the hydrogen storage space.

2. The underground large-scale hydrogen storage tank structure according to claim 1, characterized in that The concrete lining layer includes a plurality of pipe body structures. The plurality of pipe body structures are sequentially connected and arranged in the vertical direction. A connection structure is arranged between two adjacent pipe body structures. The connection structure includes a tenon and a mortise that cooperate with each other. Among them, the tenon is arranged on the pipe body structure located on the upper side of the two pipe body structures, and the mortise is arranged on the pipe body structure located on the lower side of the two pipe body structures.

3. The underground large-scale hydrogen storage tank structure according to claim 2, characterized in that, The pipe body structure includes a plurality of precast segments and a plurality of prestressing tendons. The precast segments are arranged in an arc shape. The plurality of precast segments are sequentially connected and arranged along the circumference. Each precast segment is provided with a prestressing tendon duct penetrating along its circumference. Grooves are arranged on the outer sides of both ends of the precast segment. The grooves communicate with the prestressing tendon ducts. Each prestressing tendon penetrates through two adjacent prestressing tendon ducts. Both ends of the prestressing tendon are fixed to the side walls of the grooves through anchorages. The prestressing tendon is used to fix two adjacent precast segments.

4. The underground large-scale hydrogen storage tank structure according to claim 1, characterized in that, The sealing device is also provided with an opening communicating with the hydrogen storage space. The underground large-scale hydrogen storage library structure also includes a sealing door structure. The sealing door structure is arranged at the opening and is used to open and close the opening.

5. The underground large-scale hydrogen storage tank structure according to claim 4, characterized in that, The sealing door structure includes a door frame, a sealing door, a driving mechanism and a sealing ring. The door frame is arranged on the periphery of the opening. A sealing groove is arranged on the circumference of the door frame. One end of the sealing door is rotatably installed on one side of the door frame along the axis in the horizontal direction. The driving mechanism is connected to the sealing door and is used to drive the sealing door to rotate. The sealing ring is arranged in the sealing groove. When the sealing door closes the opening, a part of the sealing door extends into the sealing groove and abuts against the sealing ring.

6. The underground large-scale hydrogen storage tank structure according to claim 5, characterized in that, A rotating shaft hole is arranged on one side of the door frame. A rotating shaft is arranged at one end of the sealing door. The rotating shaft is rotatably installed in the rotating shaft hole. The driving mechanism includes a first gear, a second gear and a driving motor. The first gear is rotatably installed on the door frame. The second gear is fixedly installed on the rotating shaft. The first gear and the second gear are meshed. The driving motor is connected to the first gear and is used to drive the first gear to rotate.

7. The underground large-scale hydrogen storage tank structure according to claim 1, wherein, The sealing structure includes a sliding buffer layer and a hydrogen-blocking sealing layer. The sliding buffer layer is pasted on the inner surface of the cavity through epoxy resin glue. The hydrogen-blocking sealing layer is pasted on the hydrogen-facing side of the sliding buffer layer through epoxy resin glue. Among them, the sliding buffer layer is made of polyurethane with a thickness of 10 - 50 mm; the hydrogen-blocking sealing layer is a polyvinyl alcohol film with a thickness of 3 - 10 mm; the epoxy resin adhesive uses a bisphenol A epoxy resin matrix and is compounded with 5% by mass fraction of alumina and 5% by mass fraction of boron nitride nanosheets.

8. The underground large-scale hydrogen storage tank structure according to claim 1, characterized in that, A plurality of uplift-resistant composite anchor piles are provided at the bottom of the concrete floor slab and the bottom of the sealing device, and the uplift-resistant composite anchor piles are used to be embedded underground to fix the concrete floor slab and the sealing device.

9. The underground large-scale hydrogen storage tank structure according to claim 1, characterized in that, The sealing device is of a reinforced concrete structure, and the cross-sectional area of the sealing device is larger than the cross-sectional area of the concrete lining layer.

10. A construction method for the underground large-scale hydrogen storage reservoir structure according to any one of claims 1-9, characterized in that, It includes the following steps: Fabricate precast segments and a sealing device, and fabricate a pipe body structure with the precast segments. Level the site, excavate a guide ditch, and set multiple groups of dewatering wells around the concrete lining layer to lower the groundwater level, and use the dewatering wells to fabricate uplift-resistant composite anchor piles. Sink the pipe body structure, and sequentially connect the pipe body structures to form a concrete lining layer. Set multiple groups of dewatering wells at the bottom of the concrete lining layer to lower the groundwater level, and use the dewatering wells to fabricate uplift-resistant composite anchor piles, and pour a concrete floor slab so that the concrete floor slab and the uplift-resistant composite anchor piles form an integral whole. Paste a sealing structure on the inner sides of the concrete lining layer and the concrete floor slab. Set multiple groups of dewatering wells around the top of the concrete lining layer to lower the groundwater level, and use the dewatering wells to fabricate uplift-resistant composite anchor piles. Install the sealing device at the top of the concrete lining layer, and fix the sealing device to the uplift-resistant composite anchor piles to form the entire hydrogen storage tank structure.

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