Foundation structure for supporting fused salt storage tank

Abstract

The invention relates to the technical field of high-temperature heat storage, in particular to a foundation structure for supporting a fused salt storage tank. The device comprises a sandy soil cushion layer and a fine sand layer which are coaxial and have the same diameter, a ring beam wrapping the periphery of the sandy soil cushion layer, and a plurality of steel plate assemblies wrapping the periphery of the fine sand layer, wherein the sandy soil cushion layer and the fine sand layer are stacked from bottom to top; the multiple steel plate assemblies are arrayed at equal intervals in the circumferential direction of the axis of the fine sand layer and fixedly inserted into the top of the ring beam. A bottom plate is installed at the bottom of the fused salt storage tank, and a plurality of steel plate strips are installed at the bottom of the bottom plate and arrayed at equal intervals in the circumferential direction of the axis of the bottom plate. The fused salt storage tank is located on the tops of the fine sand layer and the multiple steel plate assemblies through the bottom plate, and each steel plate strip is located between every two adjacent steel plate assemblies. By arranging the multiple steel plate assemblies, the steel plate assemblies can restrain and limit the circumferential thermal displacement of the steel plate strips, and the thermal displacement between the fused salt storage tank and the foundation structure is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature heat storage, and in particular to a foundation structure for supporting a molten salt storage tank. Background Art

[0002] In recent years, with the continuous optimization of my country's energy structure and the growing demand for renewable energy, concentrated solar power (CSP) technology, as a key form of efficient solar energy utilization, has experienced rapid development. The implementation and operation of concentrated solar power molten salt energy storage projects in multiple regions marks a new level of technological advancement and engineering capabilities in this field in my country.

[0003] Molten salt storage tanks, as a core component of solar thermal power generation systems, are responsible for storing and circulating high-temperature molten salt and are crucial for achieving stable energy output. Since molten salt typically operates at temperatures between 290°C and 565°C, the tanks are subject to long-term high temperatures, large temperature swings, and frequent thermal cycling. This poses significant challenges to their structural design and material selection. This is especially true with the trend toward larger tanks, which are increasing in volume and height. This leads to increasingly prominent thermal stress, deformation, and displacement during operation.

[0004] Specifically, during operation, the molten salt storage tank expands due to the high-temperature molten salt inside, while the foundation remains relatively cool. This temperature differential significantly increases the difference in thermal displacement between the tank and foundation. Irregular thermal displacement can not only lead to localized stress concentrations in the tank structure but also cause safety hazards such as seal failure and support instability, seriously impacting the overall stability, safety, and long-term operational reliability of the tank.

[0005] Currently, the industry generally uses traditional ring wall or ring beam foundation structures to support molten salt storage tanks, with a refractory brick masonry layer at the bottom to provide thermal insulation and buffering. Existing ring wall and ring beam designs often use refractory bricks laid from bottom to top, but this has some significant shortcomings: Refractory brick masonry typically has a high porosity, making it prone to loosening, cracking, or gaps when subjected to external loads. Manual masonry not only increases the complexity of construction, making the process tedious and time-consuming, but also makes it difficult to ensure construction quality.

[0006] In addition, in current large-scale molten salt storage tank projects, the thermal displacement is very large, and the bearing capacity of refractory bricks as the main body of the ring beam is also insufficient, making it difficult to ensure the stability of the contact surface between the tank bottom and the foundation; although refractory bricks are used in several domestic solar thermal energy storage projects and have some cost performance advantages, their shortcomings are gradually becoming prominent.

[0007] Therefore, there is an urgent need for a foundation structure that is simple to construct and saves time, especially a foundation structure that can improve the bearing capacity of the molten salt storage tank when the molten salt storage tank undergoes thermal displacement. Summary of the Invention

[0008] (1) Technical issues to be resolved

[0009] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a foundation structure for supporting a molten salt storage tank, which solves the technical problems in the prior art of cumbersome construction of refractory bricks, insufficient bearing capacity, and reduced stability of the contact surface between the molten salt storage tank and the foundation structure.

[0010] (2) Technical solution

[0011] In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

[0012] The present invention provides a foundation structure for supporting a molten salt storage tank, comprising a coaxial and isodiametric sand cushion layer and a fine sand layer stacked from bottom to top, a ring beam wrapped around the outer periphery of the sand cushion layer, and a plurality of steel plate assemblies wrapped around the outer periphery of the fine sand layer; the plurality of steel plate assemblies are arrayed at equal intervals circumferentially along the axis of the fine sand layer, and the steel plate assemblies are fixedly inserted on the top of the ring beam; a bottom plate is installed at the bottom of the molten salt storage tank, and a plurality of steel plate strips are installed at the bottom of the bottom plate, and the plurality of steel plate strips are arrayed at equal intervals circumferentially along the axis of the bottom plate; the molten salt storage tank is located on top of the fine sand layer and the plurality of steel plate assemblies through the bottom plate, and each steel plate strip is located between two adjacent steel plate assemblies to limit the thermal displacement of the steel plate strips caused by the thermal expansion of the molten salt storage tank.

[0013] Preferably, the steel plate assembly includes a horizontally arranged supporting steel plate and an insert plate vertically connected to the supporting steel plate; the supporting steel plate is fixedly inserted on the top of the ring beam by the insert plate, and the top wall of the insert plate is flush with the top wall of the ring beam; the steel plate strip is located between two adjacent supporting steel plates, and the side walls and bottom walls of the steel plate strip are respectively spaced from the opposite side walls of the two adjacent supporting steel plates and the top wall of the ring beam to provide redundant expansion for the steel plate strip.

[0014] Preferably, the supporting steel plates and the inserting plates are both arc-shaped plates, and the outer wall connecting lines of multiple supporting steel plates facing and away from the fine sand layer and the outer wall connecting lines of multiple inserting plates facing and away from the sand cushion layer can both form a circle; the curvature range of the supporting steel plates is 9°-12°; the curvature range of the inserting plates is 3°-4°.

[0015] Preferably, the cross-sectional height of the fine sand layer gradually decreases from the middle to both sides.

[0016] Preferably, the ring beam is a steel fiber concrete layer; the cross-sectional width of the steel fiber concrete layer ranges from 500 mm to 700 mm, and the cross-sectional height of the steel fiber concrete layer ranges from 230 mm to 330 mm.

[0017] Preferably, it also includes a ceramsite layer; the ceramsite layer is coaxially stacked below the ring beam and the sand cushion layer, and a stainless steel mesh or ceramic fiber cloth is laid between the ceramsite layer and the sand cushion layer, and the outer edge of the ceramsite layer is flush with the outer edge of the ring beam; the cross-sectional width range of the ceramsite layer is 6500mm-7000mm, and the cross-sectional height range of the ceramsite layer is 1100mm-1500mm.

[0018] Preferably, a plurality of stainless steel meshes or ceramic fiber cloths are laid vertically at intervals inside the ceramsite soil layer.

[0019] Preferably, the foundation structure also includes a foundation layer, which is coaxially stacked below the expanded clay layer; the foundation layer includes a fine gravel layer and a concrete foundation layer, the concrete foundation layer is wrapped around the outer periphery of the fine gravel layer, and a plurality of ventilation pipes arranged at laterally intervals are provided in the fine gravel layer; the cross-sectional width range of the fine gravel layer is 6000mm-7000mm, and the cross-sectional height range of the fine gravel layer is 350mm-450mm; the cross-sectional width range of the concrete foundation layer is 700mm-900mm, and the cross-sectional height range of the concrete foundation layer is 350mm-450mm.

[0020] Preferably, the foundation structure also includes an insulation layer; the insulation layer is wrapped around the periphery of the expanded clay layer, the ring beam and the steel plate assembly, and the top and bottom of the insulation layer are flush with the top of the steel plate assembly and the bottom of the expanded clay layer respectively; the cross-sectional width of the insulation layer ranges from 150mm to 250mm.

[0021] Preferably, the basic structure further includes a load-bearing layer; the load-bearing layer is wrapped around the outer periphery of the thermal insulation layer, and the top and bottom of the load-bearing layer are flush with the top and bottom of the thermal insulation layer respectively; the cross-sectional width of the load-bearing layer ranges from 250mm to 350mm.

[0022] (3) Beneficial effects

[0023] The beneficial effects of the present invention are:

[0024] The present invention provides a plurality of steel plate assemblies, and provides a bottom plate and a plurality of steel plate strips at the bottom of the molten salt storage tank, and places the steel plate strips between two adjacent steel plate assemblies, so that when the molten salt storage tank generates circumferential thermal displacement due to temperature changes, the steel plate assembly can constrain and limit the circumferential thermal displacement of the steel plate strips, thereby reducing the thermal displacement between the molten salt storage tank and the foundation structure, thereby significantly reducing the safety hazards such as local stress concentration, sealing failure and support instability caused by the temperature difference of the molten salt storage tank, ensuring that the molten salt storage tank can also maintain its own stability under a huge temperature difference, so as to improve the overall heat exchange efficiency and safety of the molten salt storage tank. Moreover, by providing a ring beam, a plurality of steel plate assemblies are fixedly inserted on the ring beam, which can directly bear the high stress concentration area of ​​the tank wall load, evenly disperse the huge weight from the molten salt storage tank and the various loads generated during operation, and improve the stability of the foundation structure. By providing a sand cushion layer and a fine sand layer, it can provide a buffering effect for the molten salt storage tank. Compared with the refractory bricks in the prior art, the structure of the steel plate assembly and the ring beam in the present invention is simpler, which improves the construction efficiency and the stability and durability of the foundation structure, ensuring that the molten salt storage tank can operate safely and stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a foundation structure for supporting a molten salt storage tank according to the present invention;

[0026] Figure 2 for Figure 1 A in the middle is an enlarged structural diagram;

[0027] Figure 3 Schematic diagram of the cross-sectional structure of a foundation structure for supporting a molten salt storage tank according to the present invention;

[0028] Figure 4 for Figure 3 The enlarged structural diagram at B in the middle;

[0029] Figure 5 This is a front structural schematic diagram of a fine sand layer for supporting a foundation structure of a molten salt storage tank according to the present invention;

[0030] Figure 6 This is a schematic diagram of the bottom structure of a steel plate assembly for supporting a foundation structure of a molten salt storage tank according to the present invention.

[0031] [Description of Reference Numerals]

[0032] 1: Sand cushion layer; 2: Fine sand layer; 3: Steel plate assembly; 31: Support steel plate; 32: Insert plate; 4: Molten salt storage tank; 5: Bottom plate; 6: Steel plate strip; 7: Ring beam; 8: Ceramic aggregate soil layer; 9: Foundation layer; 91: Fine gravel layer; 92: Concrete foundation layer; 10: Insulation layer; 11: Bearing layer. DETAILED DESCRIPTION

[0033] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0034] Example

[0035] like Figure 1-Figure 3 As shown, the foundation structure for supporting a molten salt storage tank in this embodiment includes a coaxial and isotropic sand cushion layer 1 and a fine sand layer 2 stacked from bottom to top, a ring beam 7 wrapped around the outer periphery of the sand cushion layer 1, and multiple steel plate assemblies 3 wrapped around the outer periphery of the fine sand layer 2. The sand cushion layer 1 and the fine sand layer 2 provide a buffering effect for the molten salt storage tank 4. Furthermore, the sand cushion layer 1 and the fine sand layer 2 maintain excellent physical properties in high-temperature environments, are less susceptible to chemical decomposition or material degradation, and maintain relatively stable mechanical properties at high temperatures, preventing failure due to long-term high-temperature exposure. Furthermore, during operation, the bottom temperature of the molten salt storage tank 4 is high, and the foundation structure is susceptible to temperature fluctuations. The low thermal expansion coefficient of sand and fine sand effectively copes with temperature fluctuations in the foundation structure. Compared to refractory bricks in the prior art, the steel plate assemblies 3 and the ring beam 7 in the present invention are simpler in structure, improving construction efficiency and the stability and durability of the foundation structure, ensuring the long-term safe and stable operation of the molten salt storage tank 4.

[0036] Specifically, if Figure 1 As shown, multiple steel plate assemblies 3 are arranged at equal intervals along the circumferential axis of the fine sand layer 2, and the steel plate assemblies 3 are fixedly inserted on the top of the ring beam 7. A bottom plate 5 is installed at the bottom of the molten salt storage tank 4, and multiple steel plate strips 6 are installed at the bottom of the bottom plate 5. The multiple steel plate strips 6 are arranged at equal intervals along the circumferential axis of the bottom plate 5. The molten salt storage tank 4 is located on the top of the fine sand layer 2 and the multiple steel plate assemblies 3 through the bottom plate 5. Figure 2As shown, each steel strip 6 is located between two adjacent steel plate assemblies 3 to limit the thermal displacement of the steel strip 6 caused by the thermal expansion of the molten salt storage tank 4. By setting a plurality of steel plate assemblies 3, and setting a bottom plate 5 and a plurality of steel strips 6 at the bottom of the molten salt storage tank 4, the steel strips 6 are placed between two adjacent steel plate assemblies 3, so that when the molten salt storage tank 4 generates circumferential thermal displacement due to temperature changes, the steel plate assembly 3 can constrain and limit the circumferential thermal displacement of the steel strip 6, thereby reducing the thermal displacement between the molten salt storage tank 4 and the foundation structure, effectively dispersing the stress caused by the thermal expansion of the molten salt storage tank 4, and significantly reducing the safety hazards such as local stress concentration, sealing failure and support instability caused by temperature difference in the molten salt storage tank 4, ensuring that the molten salt storage tank 4 can still maintain its own stability under a huge temperature difference, thereby improving the overall heat exchange efficiency and safety of the molten salt storage tank 4, and extending the service life of the molten salt storage tank 4 and the foundation structure. Moreover, by setting up a ring beam 7, multiple steel plate assemblies 3 are fixedly inserted on the ring beam 7, which can directly bear the high stress concentration area of ​​the tank wall load, evenly disperse the huge weight from the molten salt storage tank 4 and various loads generated during operation, and improve the stability of the basic structure.

[0037] Among them, Figure 5 As shown, the cross-sectional height of the fine sand layer 2 gradually decreases from the middle to the sides, which enables the fine sand layer 2 to flow with the location of the molten salt storage tank 4 when the molten salt storage tank 4 is located on the foundation structure, so as to fill irregular areas until the fine sand layer 2 is evenly distributed, so that the fine sand layer 2 is more evenly stressed when supporting the molten salt storage tank 4. The fine sand layer 2 achieves the function of leveling the top of the foundation structure, ensuring that the top of the foundation structure has a uniform support surface, avoiding large deformation of the foundation structure due to thermal expansion or contraction of the molten salt storage tank 4, thereby reducing the foundation stress caused by temperature changes, and preventing excessive displacement or uneven settlement at the bottom of the molten salt storage tank 4. It can effectively regulate the foundation stress caused by temperature changes, disperse the load of the molten salt storage tank 4, and provide a certain degree of drainage and ventilation capacity, ensuring the long-term stability and safety of the tank foundation.

[0038] Further, if Figure 4As shown, the steel plate assembly 3 includes a horizontally arranged supporting steel plate 31 and an insert plate 32 vertically connected to the supporting steel plate 31. The supporting steel plate 31 is fixedly inserted on the top of the ring beam 7 through the insert plate 32. The top wall of the insert plate 32 is flush with the top wall of the ring beam 7, which can make the supporting steel plate 31 more stable when installed on the ring beam 7, avoid the displacement of the supporting steel plate 31 under the annular load transmitted from the wall of the molten salt storage tank 4, and improve the stability of the foundation structure. By providing the supporting steel plate 31 and the insert plate 32, it is used to support the annular load transmitted from the wall of the molten salt storage tank 4, and evenly transfer the stress to the ring beam 7 through the insert plate 32, so that the foundation structure is more stable when supporting the molten salt storage tank 4. Moreover, it also minimizes the load on the ring beam 7 in the vertical direction and reduces the wear on the ring beam 7. Even under high-temperature working conditions, the ring beam 7 will not crack or wear due to frequent stress changes. It also ensures that the ring beam 7 will not sink due to external forces, thereby enhancing the stability of the molten salt storage tank 4 and the foundation structure.

[0039] like Figure 2 As shown, the steel strip 6 is located between two adjacent supporting steel plates 31. This can constrain and limit the circumferential thermal displacement of the steel strip 6 caused by temperature changes in the molten salt storage tank 4, thereby preventing problems such as local stress concentration, sealing failure, and support instability caused by temperature differences in the molten salt storage tank 4, thereby improving safety. Furthermore, a gap is provided between the side walls and bottom wall of the steel strip 6 and the opposite side walls of the two adjacent supporting steel plates 31 and the top wall of the ring beam 7, respectively, to provide redundant expansion capacity for the steel strip 6. When the molten salt storage tank 4 undergoes thermal expansion due to temperature increases during operation, the steel strip 6 below the bottom plate 5 will expand accordingly and produce thermal displacement. By providing a gap, sufficient redundant expansion capacity can be provided for the steel strip 6, thereby preventing the steel strip 6 and the supporting steel plates 31 from being squeezed, deformed, or damaged due to thermal displacement of the steel strip 6.

[0040] Further, if Figure 6As shown, the supporting steel plate 31 and the insert plate 32 are both arc-shaped plates. The direction of the outer wall connecting the plurality of supporting steel plates 31 and the outer wall connecting the plurality of insert plates 32 and the outer wall connecting the plurality of insert plates 32 and the outer wall connecting the plurality of insert plates 32 and the plurality of insert plates 32 can form a circle, which can adapt to the outer contour of the bottom and the bottom plate 5 of the molten salt storage tank 4, so that the plurality of supporting steel plates 31 and the plurality of insert plates 32 can achieve a more uniform stress distribution when supporting the molten salt storage tank 4 and bearing force, thereby avoiding the instability or deformation of the foundation structure due to local stress concentration, and improving the stability of the foundation structure. In addition, the supporting steel plate 31 can also maintain surface integrity under the long-term operation of the molten salt storage tank 4, so as to reduce wear and extend the service life. Moreover, the load borne by the supporting steel plate 31 when supporting the molten salt storage tank 4 is more uniform, without obvious weak areas, so as to better resist the various mechanical stresses of the molten salt storage tank 4 during operation, avoid uneven settlement of the surface of the supporting steel plate 31, thereby ensuring the stability and safety of the entire foundation structure.

[0041] Preferably, the curvature of the support steel plates 31 ranges from 9° to 12°. This allows multiple support steel plates 31 to be installed at intervals, and also allows the lines connecting the outer walls of the multiple support steel plates 31 facing toward and away from the fine sand layer 2 to form a circle to accommodate the bottom of the molten salt storage tank 4 and the outer contour of the bottom plate 5. This allows the support steel plates 31 to be more evenly stressed when supporting the molten salt storage tank 4, avoiding stress concentration. The curvature of the insert plate 32 ranges from 3° to 4°, which allows the insert plate 32 to have a larger contact area with the ring beam 7 when inserted within the ring beam 7, thereby making the insert plate 32 more stable when inserted within the ring beam 7. This further enhances the stability of the support steel plates 31 and improves the stability of the foundation structure.

[0042] Furthermore, the ring beam 7 is a steel fiber concrete layer, which can directly withstand the high stress concentration area of ​​the tank wall load of the molten salt storage tank 4, avoiding stress concentration in the molten salt storage tank 4, which may lead to sealing failure and support instability. Steel fiber concrete is concrete reinforced by adding steel fibers, which can effectively improve the crack resistance and tensile strength of concrete. The elastic modulus can still reach 20GPa-30GPa. As the material of the ring beam 7, it minimizes deformation to the greatest extent and improves structural rigidity. Due to the inhibitory effect of steel fibers, high-temperature creep is smaller than that of ordinary heat-resistant concrete, which can effectively reduce the deformation accumulation caused by long-term loads, thereby being able to withstand huge loads. Through the dispersed reinforcement of steel fibers, the tensile strength of concrete is improved, which can effectively resist stress concentration caused by thermal expansion and contraction and prevent concrete cracking.

[0043] Preferably, the cross-sectional width of the steel fiber concrete layer ranges from 500mm to 700mm, and the cross-sectional height of the steel fiber concrete layer ranges from 230mm to 330mm. This can improve the lateral load-bearing capacity of the ring beam 7 and the stability of the insertion of the insert plates 32, preventing local instability or slippage caused by thermal displacement. This ensures the overall rigidity of the structure without increasing the construction difficulty and cost by making the foundation structure too large. It also facilitates on-site formwork installation and concrete pouring, which helps improve construction efficiency and quality control.

[0044] Further, if Figure 3 As shown, the foundation structure also includes a ceramsite layer 8. The ceramsite layer 8 is coaxially stacked below the ring beam 7 and the sand cushion 1. The ceramsite layer 8 can absorb and prevent the heat radiation from the bottom of the molten salt storage tank 4 from being transmitted to the ground, thereby reducing the temperature rise of the underlying foundation structure. The ceramsite layer 8 is made of ultra-light, low-density ceramsite, whose density is generally less than 300 kg / m 3 , which makes the overall structure of the foundation structure lighter, reduces the burden on the foundation structure, and has good thermal insulation performance. Moreover, ceramsite soil also has good bearing capacity, especially after compaction, it can provide stable support to prevent the molten salt storage tank 4 from sinking or uneven settlement, thereby improving the stability and durability of the foundation structure. And a stainless steel mesh or ceramic fiber cloth is laid between the ceramsite soil layer 8 and the sand cushion layer 1, which can prevent sand particles from penetrating into the ceramsite soil layer 8 and causing local settlement or structural damage, and also play a certain reinforcement role, thereby improving the shear resistance of the sand cushion layer 1 and the ceramsite soil layer 8 and the structural integrity of long-term operation. The outer edge of the ceramsite soil layer 8 is flush with the outer edge of the ring beam 7 to improve the flatness of the foundation structure. The cross-sectional width range of the ceramsite soil layer 8 is 6500mm-7000mm, and the cross-sectional height range of the ceramsite soil layer 8 is 1100mm-1500mm, which can enable the ceramsite soil layer 8 to provide a wider bearing area and higher deformation adaptability for the entire foundation structure.

[0045] In addition, expanded clay as a filler for foundation structures has good air permeability and drainage, which is also an effective preventive measure for preventing the risk of subsidence caused by groundwater accumulation. It performs well in terms of corrosion resistance and environmental adaptability, which helps to extend the service life of the foundation structure and meet the needs of sustainable development. At the same time, it improves cost-effectiveness, thereby extending the service life of the molten salt storage tank 4 and reducing maintenance and repair costs.

[0046] Furthermore, multiple stainless steel meshes or ceramic fiber cloths (not shown) are vertically spaced within the ceramsite layer 8. This further enhances the thermal insulation effect, reduces heat conduction between different layers, and enhances the stability of the foundation structure, helping to evenly distribute the load above it, preventing settlement or deformation, and reducing the possibility of uneven settlement. In addition, the use of ceramic fiber cloth, which has excellent thermal insulation and high-temperature resistance, can provide additional thermal insulation protection in high-temperature environments.

[0047] Further, if Figure 3 As shown, the basic structure further includes a foundation layer 9 , which is coaxially stacked below the ceramsite layer 8 .

[0048] Specifically, the foundation layer 9 includes a fine gravel layer 91 and a concrete foundation layer 92. The concrete foundation layer 92 is wrapped around the outer periphery of the fine gravel layer 91, which can prevent the fine gravel in the fine gravel layer 91 from flowing out, so as to improve the stability of the foundation structure. Moreover, steel bars of different specifications can be pre-buried in the concrete foundation layer 92. The concrete foundation layer 92 can not only provide support for the molten salt storage tank 4, but also has good compressive strength. It can also bear the huge weight of the molten salt storage tank 4 and disperse the load on the foundation to resist various stresses that may be generated during the operation of the molten salt storage tank 4. A plurality of ventilation pipes arranged at intervals in the transverse direction are provided in the fine gravel layer 91, which can cope with the overheating phenomenon that may occur in the foundation structure under certain extreme working conditions. In this way, heat can be effectively discharged from the inside of the foundation, especially when the temperature below the expanded clay layer 8 exceeds the safe temperature of the concrete foundation layer 92, the ventilation pipe can effectively reduce the temperature of the foundation structure, maintain the temperature of the foundation structure stable, reduce the accumulation of thermal stress, and prevent the foundation structure from cracking or local deformation due to thermal expansion. It not only improves the durability of the foundation structure, but also ensures the stability and safety of the entire foundation structure in various complex environments.

[0049] Preferably, the cross-sectional width of the fine gravel layer 91 ranges from 6000mm to 7000mm, and the cross-sectional height of the fine gravel layer 91 ranges from 350mm to 450mm. This ensures sufficient load-bearing area while effectively buffering the effects of uneven settlement and thermal displacement from the superstructure, thereby improving the overall stability and deformation resistance of the foundation structure. The cross-sectional width of the concrete foundation layer 92 ranges from 700mm to 900mm, and the cross-sectional height of the concrete foundation layer 92 ranges from 350mm to 450mm. This allows the concrete foundation layer 92 to effectively constrain the fine gravel layer 91 and prevent lateral expansion or instability during compression.

[0050] Further, if Figure 3As shown, the foundation structure also includes an insulation layer 10. This insulation layer 10 wraps around the ceramsite layer 8, ring beam 7, and steel plate assembly 3. The top and bottom of the insulation layer 10 are flush with the top of the steel plate assembly 3 and the bottom of the ceramsite layer 8, respectively. The insulation layer 10 directly provides high-temperature thermal insulation, effectively blocking heat transfer pathways and significantly reducing heat loss. Preferably, the insulation material for the insulation layer 10 can be foam glass or calcium silicate board. Foam glass has excellent compression properties and relatively high compressive strength. While lightweight, its porous structure can uniformly withstand significant external pressure, making it suitable for insulation applications requiring lateral loads. Foam glass is also corrosion-resistant and non-absorbent, making it suitable for demanding environmental conditions. Its light weight also reduces the overall structural burden. Calcium silicate board offers excellent thermal insulation and temperature resistance, reducing heat loss due to joints. Furthermore, the elastic modulus of calcium silicate board can reach 20-30 GPa, helping to minimize deformation and increase structural rigidity. Due to the inhibitory effect of steel fiber reinforced concrete, high-temperature creep is less than that of ordinary heat-resistant concrete, effectively reducing the cumulative deformation caused by long-term loads. It can also withstand the effects of high-temperature molten salts for a long time, maintaining good dimensional stability and avoiding structural changes or stress concentration caused by thermal expansion or contraction. It is less susceptible to deformation, cracking, or degradation under heat, providing direct high-temperature thermal insulation protection, effectively blocking heat transfer paths, and significantly reducing heat loss.

[0051] Preferably, the cross-sectional width of the insulation layer 10 ranges from 150 mm to 250 mm, which helps to save space and reduce project costs. At the same time, while ensuring good insulation effects, it will not significantly affect the overall layout of the infrastructure and prevent damage from external collisions during construction or operation.

[0052] Among them, the insulation layer 10 can adopt a modular structure, so that the insulation layer 10 can be installed by only mechanical connection, such as a tenon-type connection method, a plug-in method, etc. It does not need to be completely sealed. Since the temperature of the molten salt storage tank 4 will increase significantly during operation, the insulation layer 10 will produce thermal expansion due to the temperature increase, and the thermal expansion will cause adjacent insulation materials to squeeze each other, thereby meeting the integrity and sealing of the insulation layer 10 and improving the stability of the insulation layer 10. Moreover, by installing the insulation layer 10 through mechanical connection, it is possible to quickly carry out the laying operation of the insulation layer 10 under different construction conditions, improve construction efficiency, reduce construction difficulty, shorten the construction period, and make construction more convenient and quick.

[0053] Further, if Figure 3As shown, the base structure also includes a load-bearing layer 11. The load-bearing layer 11 is wrapped around the outer periphery of the thermal insulation layer 10, and the top and bottom of the load-bearing layer 11 are flush with the top and bottom of the thermal insulation layer 10 respectively. The load-bearing layer 11 can provide stable support to ensure the integrity of the molten salt storage tank 4 and prevent cracks or deformation due to thermal expansion or external forces. Since the thermal stress caused by the weight of the molten salt in the molten salt storage tank 4 and the temperature change will cause circumferential force, the load-bearing layer 11 needs to have sufficient compressive strength and durability to resist these loads. Among them, the load-bearing layer 11 can be low-alloy high-strength structural steel or magnesium-aluminum heat-resistant concrete. Low-alloy high-strength structural steel is used, which has good mechanical properties and corrosion resistance, and is suitable for long-term use in high temperature and corrosive environments. The load-bearing layer 11 and the thermal insulation layer 10 are wrapped by welding to provide multi-faceted protection and structural integrity. Magnesium-aluminum heat-resistant concrete has good thermal stability and thermal shock resistance at high temperatures. Even at an operating temperature close to 500°C, the compressive strength of magnesium-aluminum heat-resistant concrete is usually high, which enables it to maintain its structural integrity in high temperature environments.

[0054] Preferably, the cross-sectional width of the load-bearing layer 11 ranges from 250mm to 350mm, which can meet the load-bearing requirements of the foundation structure without affecting the overall layout and construction efficiency of the foundation structure due to excessive width. At the same time, the top of the load-bearing layer 11 is flush with the top of the insulation layer 10, and the bottom extends to be flush with the bottom of the insulation layer 10. This ensures the continuity and coordination of the foundation structure from the inside to the outside in the vertical direction, facilitates the uniform vertical transfer of loads, and avoids local stress concentration caused by structural misalignment.

[0055] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0056] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0058] In the description of this specification, the terms "one embodiment", "some embodiments", "embodiments", "examples", "specific examples" or "some examples" refer to the specific features, structures, materials or characteristics described in conjunction with the embodiment or example and included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0059] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A foundation structure for supporting a molten salt storage tank, characterized in that: It comprises a coaxial and identically diametric sand cushion layer (1) and a fine sand layer (2) stacked from bottom to top, a ring beam (7) wrapped around the outer periphery of the sand cushion layer (1), and a plurality of steel plate assemblies (3) wrapped around the outer periphery of the fine sand layer (2); A plurality of the steel plate assemblies (3) are arranged in an array at equal intervals along the circumference of the axis of the fine sand layer (2), and the steel plate assemblies (3) are fixedly inserted on the top of the ring beam (7); The bottom of the molten salt storage tank (4) is provided with a bottom plate (5), and the bottom of the bottom plate (5) is provided with a plurality of steel strips (6), and the plurality of steel strips (6) are arranged in an array with equal intervals in the circumferential direction of the axis of the bottom plate (5); The molten salt storage tank (4) is located on top of the fine sand layer (2) and the plurality of steel plate assemblies (3) through the bottom plate (5), and each of the steel plate strips (6) is located between two adjacent steel plate assemblies (3) to limit the thermal displacement of the steel plate strips (6) caused by the thermal expansion of the molten salt storage tank (4).

2. The foundation structure for supporting a molten salt storage tank according to claim 1, wherein: The steel plate assembly (3) comprises a horizontally arranged supporting steel plate (31) and a plug plate (32) vertically connected to the supporting steel plate (31); The supporting steel plate (31) is fixedly inserted on the top of the ring beam (7) through the inserting plate (32), and the top wall of the inserting plate (32) is flush with the top wall of the ring beam (7); The steel strip (6) is located between two adjacent supporting steel plates (31), and the side walls and bottom wall of the steel strip (6) are spaced from the opposite side walls of the two adjacent supporting steel plates (31) and the top wall of the ring beam (7) to provide redundant expansion capacity for the steel strip (6).

3. The foundation structure for supporting a molten salt storage tank according to claim 2, wherein: The supporting steel plates (31) and the inserting plates (32) are both arc-shaped plates, and a line connecting the outer walls of the plurality of supporting steel plates (31) facing toward and away from the fine sand layer (2) and a line connecting the outer walls of the plurality of inserting plates (32) facing toward and away from the sand cushion layer (1) can both form a circle; The arc range of the supporting steel plate (31) is 9°-12°; The arc range of the inserting plate (32) is 3°-4°.

4. The foundation structure for supporting a molten salt storage tank according to claim 1, wherein: The cross-sectional height of the fine sand layer (2) gradually decreases from the middle to both sides.

5. The foundation structure for supporting a molten salt storage tank according to claim 1, wherein: The ring beam (7) is a steel fiber concrete layer; The cross-sectional width of the steel fiber concrete layer ranges from 500 mm to 700 mm, and the cross-sectional height of the steel fiber concrete layer ranges from 230 mm to 330 mm.

6. The foundation structure for supporting a molten salt storage tank according to claim 1, wherein: Also included is a ceramsite layer (8); The ceramsite layer (8) is coaxially stacked below the ring beam (7) and the sand cushion layer (1), and a stainless steel mesh or ceramic fiber cloth is laid between the ceramsite layer (8) and the sand cushion layer (1), and the outer edge of the ceramsite layer (8) is flush with the outer edge of the ring beam (7); The cross-sectional width of the ceramsite layer (8) is in the range of 6500 mm to 7000 mm, and the cross-sectional height of the ceramsite layer (8) is in the range of 1100 mm to 1500 mm.

7. The foundation structure for supporting a molten salt storage tank according to claim 6, wherein: A plurality of stainless steel meshes or ceramic fiber cloths are laid vertically at intervals inside the ceramsite soil layer (8).

8. The foundation structure for supporting a molten salt storage tank according to claim 6, wherein: The foundation structure further comprises a foundation layer (9), wherein the foundation layer (9) is coaxially stacked below the ceramsite layer (8); The foundation layer (9) comprises a fine gravel layer (91) and a concrete foundation layer (92), wherein the concrete foundation layer (92) is wrapped around the outer periphery of the fine gravel layer (91), and a plurality of ventilation pipes are arranged in a transversely spaced manner in the fine gravel layer (91); The cross-sectional width of the fine gravel layer (91) ranges from 6000 mm to 7000 mm, and the cross-sectional height of the fine gravel layer (91) ranges from 350 mm to 450 mm; The cross-sectional width of the concrete foundation layer (92) ranges from 700 mm to 900 mm, and the cross-sectional height of the concrete foundation layer (92) ranges from 350 mm to 450 mm.

9. The foundation structure for supporting a molten salt storage tank according to claim 6, wherein: The base structure further comprises a thermal insulation layer (10); The thermal insulation layer (10) is wrapped around the periphery of the ceramsite layer (8), the ring beam (7) and the steel plate assembly (3), and the top and bottom of the thermal insulation layer (10) are flush with the top of the steel plate assembly (3) and the bottom of the ceramsite layer (8), respectively; The cross-sectional width of the thermal insulation layer (10) ranges from 150 mm to 250 mm.

10. The foundation structure for supporting a molten salt storage tank according to claim 9, wherein: The basic structure further comprises a bearing layer (11); The bearing layer (11) is wrapped around the outer periphery of the thermal insulation layer (10), and the top and bottom of the bearing layer (11) are flush with the top and bottom of the thermal insulation layer (10), respectively; The cross-sectional width of the bearing layer (11) ranges from 250 mm to 350 mm.

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