Core-shell type concrete gravity energy storage block

Abstract

The invention provides a core-shell type concrete gravity energy storage block, and relates to the technical field of gravity energy storage, and the core-shell type concrete gravity energy storage block comprises a shell, a top cover and a balancing weight; the shell is formed by pouring ultra-high-performance self-compacting concrete, and is provided with longitudinal reinforcing bars and transverse stirrups for forming a protective shell; the top cover is arranged at the top of the shell, and a plurality of hoisting holes used for being connected with driving equipment are formed in the top cover; the top cover and the hoisting holes are formed by pouring ultra-high-performance self-compacting concrete; and the balancing weight is filled in a filling space formed by the shell and is formed by cementing low-strength self-compacting concrete with block stones. According to the core-shell type concrete gravity energy storage block provided by the invention, the construction cost and environmental load of the gravity energy storage block are remarkably reduced while the structural strength and durability are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gravity energy storage, and in particular to a core-shell type concrete gravity energy storage block. BACKGROUND

[0002] Gravity energy storage is a physical energy storage method based on the mutual conversion between gravitational potential energy and electrical energy. Specifically, the energy storage and release are achieved by lifting the energy storage medium (i.e., gravity block) between different heights. When there is excess electricity, the driving device lifts the gravity block from the low position to the high position, converting electrical energy into gravitational potential energy for storage. When there is a shortage of electricity, the gravity block is controlled to fall, driving the generator through the transmission device to generate electricity, thereby converting gravitational potential energy into electrical energy. This technology has the advantages of high safety, flexible site selection, and fast response speed, and has become one of the research hotspots in the field of energy storage technology in recent years.

[0003] The gravity blocks used in existing gravity energy storage systems are mainly made of materials such as concrete and stone blocks, and are generally cast in one piece, with a single volume of up to tens of cubic meters and a mass of up to dozens of tons. However, the existing structure has the following problems in actual application:

[0004] On the one hand, if the gravity block is cast in one piece using cement-based materials, not only is the material cost high, but also due to the large volume, high adiabatic temperature rise can occur during the hydration reaction process, which can cause temperature cracks and shrinkage cracks, which is not conducive to the stability of the structure. At the same time, the use of a large amount of cement also increases greenhouse gas emissions, lacking environmental friendliness and economy.

[0005] On the other hand, during the operation of the gravity energy storage system, the gravity block needs to be lifted frequently, and is subjected to cyclic impact and friction for a long time, which can easily cause the external concrete of the gravity block to be eroded, damaged, and cracked, seriously affecting the service life of the gravity block and the stability and safety of the system operation. Therefore, such a structure places high requirements on the durability, strength, and impact resistance of the concrete material.

[0006] In summary, how to ensure the strength and durability of the gravity block structure while considering its economy, environmental friendliness, and the feasibility of the manufacturing process has become a key technical problem that needs to be solved in the design and optimization of concrete gravity energy storage block structures.

[0007] This section aims to provide background or context for the embodiments of the application set forth in the claims. The description herein is not admitted to be prior art merely because it is included in this section. SUMMARY

[0008] To solve the problems in the prior art, the embodiments of the present application provide a core-shell type concrete gravity energy storage block.

[0009] In one aspect of the present application, a core-shell type concrete gravity energy storage block is provided, which comprises: an outer shell, a top cover and a counterweight block.

[0010] The outer shell is cast by ultra-high performance self-compacting concrete, and is provided with longitudinal reinforcement and transverse stirrups for forming a protective shell.

[0011] The top cover is arranged on the top of the outer shell, and a plurality of lifting holes for connecting with driving equipment are arranged on the top cover; the top cover and the lifting holes are cast by ultra-high performance self-compacting concrete.

[0012] The counterweight block is filled in the filling space formed by the outer shell and is formed by low-strength self-compacting concrete cemented stone.

[0013] Further, the ultra-high performance self-compacting concrete has an expansion degree of 550-700 mm, a V-shaped funnel passing time of 5-25 s, and is mixed with steel fibers with a volume fraction of 1%-3%; the compressive strength is 80-120 MPa, and the flexural strength is 10-15 MPa.

[0014] Further, the longitudinal reinforcement of the outer shell adopts HRB500 or HRB600 grade steel bars, and the minimum longitudinal reinforcement ratio is not less than 0.7% and not more than 5%.

[0015] Further, the spacing of the transverse stirrups of the outer shell is not more than 15 times the diameter of the longitudinal reinforcement or 400 mm, and the diameter is not less than 1 / 4 of the diameter of the longitudinal reinforcement.

[0016] Further, the thickness of the outer shell is 15-30 cm for forming a high-strength protective layer.

[0017] Further, the low-strength self-compacting concrete has an expansion degree of 650-700 mm, a V-shaped funnel passing time of 5-25 s, and a compressive strength of 10-25 MPa.

[0018] Further, the stone is a large-diameter hard stone with a particle size of 150 mm-3000 mm, and the particle size is not more than 1 / 3 of the long side size of the core-shell type concrete gravity energy storage block.

[0019] Further, the overall density of the counterweight block is 2400-2600 kg / m³.

[0020] Further, the total stone rate of the counterweight block is 50%-60%.

[0021] Further, the counterweight block is divided and recycled after damage, and is used as recycled aggregate stone for the production of new counterweight blocks.

[0022] The application provides a core-shell type concrete gravity energy storage block, comprising: an outer shell, a top cover and a counterweight block; the outer shell is formed by pouring super high performance self-compacting concrete, and is provided with longitudinal reinforcement and transverse stirrups for forming a protective shell; the top cover is arranged on the top of the outer shell, and a plurality of hoisting holes for connecting with driving equipment are arranged on the top cover; the top cover and the hoisting holes are formed by pouring super high performance self-compacting concrete; and the counterweight block is filled in a filling space formed by the outer shell and is formed by low-strength self-compacting concrete cemented stones. The core-shell type concrete gravity energy storage block provided by the application can significantly reduce the construction cost and environmental load of the gravity energy storage block while ensuring the structural strength and durability.

[0023] The gravity energy storage block provided by the application considers construction convenience, structural durability and economic and environmental friendliness in structural design and material selection: the inner part and the outer shell are formed by pouring self-compacting concrete, so that the vibrating process is omitted, and the construction is more convenient; the outer shell is made of reinforced super high performance self-compacting concrete, has excellent strength, durability and impact resistance, and can effectively avoid the influence of the edge damage on the service life of the heavy block in the repeated lifting process; the counterweight part is made of low-strength self-compacting concrete cemented large-diameter stones, greatly reduces the cement consumption, reduces the risk of volume shrinkage and cracking caused by hydration heat, the stone material can be obtained locally, significantly reduces the construction cost, and has good economic, environmental and thermal insulation properties. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor. In the drawings:

[0025] Figure 1 is a cross-sectional structure schematic diagram of the core-shell type concrete gravity energy storage block provided by an embodiment of the application;

[0026] Figure 2 is a three-dimensional structure schematic diagram of the outer shell of the core-shell type concrete gravity energy storage block provided by an embodiment of the application;

[0027] Figure 3 is a three-dimensional structure schematic diagram of the core-shell type concrete gravity energy storage block provided by an embodiment of the application;

[0028] Figure 4 is a three-dimensional structure schematic diagram of the longitudinal reinforcement and the transverse stirrups in the outer shell of the core-shell type concrete gravity energy storage block provided by an embodiment of the application;

[0029] Figure 5This is a three-dimensional structural schematic diagram of the counterweight block of a core-shell type concrete gravity energy storage block provided in an embodiment of this application. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] Gravity energy storage is a novel physical energy storage method developed based on the principle of pumped hydro storage. It achieves the conversion between electrical energy and gravitational potential energy by lifting and lowering heavy blocks. However, existing gravity energy storage power stations generally suffer from problems such as a large number of heavy blocks, large individual mass, and high construction costs. Furthermore, the materials used are not durable enough and are prone to damage, affecting the stability and lifespan of the system.

[0033] The proposed solution utilizes a large amount of excavated waste rock generated during construction as aggregate to fill the internal space of the counterweight block, saving material costs and effectively solving the waste rock disposal problem. Simultaneously, the outer shell of the counterweight block is made of ultra-high performance self-compacting concrete with reinforced structure, significantly improving its impact and abrasion resistance and durability, thereby reducing maintenance costs and extending its overall service life.

[0034] Figure 1 This is a cross-sectional structural schematic diagram of a core-shell concrete gravity energy storage block provided in an embodiment of this application, as shown below. Figure 1 As shown, the core-shell type concrete gravity energy storage block provided in this application includes: an outer shell 1, a top cover 2, and a counterweight block 3;

[0035] The outer shell 1 is made of ultra-high performance self-compacting concrete and is equipped with longitudinal reinforcement and transverse stirrups to form a protective shell.

[0036] The top cover 2 is located on the top of the outer shell 1, and has a plurality of lifting holes 4 for connecting to the drive equipment; the top cover 2 and the lifting holes 4 are made of ultra-high performance self-compacting concrete.

[0037] The counterweight 3 fills the filling space formed by the outer shell 1 and is formed by low-strength self-compacting concrete cemented blocks.

[0038] Specifically, core-shell concrete gravity energy storage blocks are used as potential energy storage media in gravity energy storage systems, and have advantages such as high structural strength, convenient construction, low cost, and strong adaptability. A core-shell concrete gravity energy storage block consists of three parts: an outer shell 1, a top cover 2, and a counterweight 3.

[0039] The outer shell 1 is integrally cast from ultra-high performance self-compacting concrete, forming the protective shell for the entire gravity energy storage block. It contains longitudinal reinforcement and transverse stirrups to improve the shell's load-bearing capacity and impact resistance. Figure 2 As shown, the outer shell 1 forms a box structure with an open top, providing space for the filling of the internal counterweight 3.

[0040] The top cover 2 is installed on the top of the outer casing 1 to enclose the counterweight 3 inside the outer casing 1. To achieve a reliable connection with the lifting device, such as... Figure 3 As shown, the top cover 2 is provided with multiple lifting holes 4 to facilitate the lifting equipment to provide force support during the lifting of heavy blocks. The top cover 2 and the lifting holes 4 are also integrally cast from ultra-high performance self-compacting concrete to ensure that they are consistent with the outer shell 1 in terms of mechanical properties and construction methods, forming a sealed and solid integrated structure.

[0041] The counterweight 3 is disposed within the filling space formed by the outer shell 1 to provide the necessary mass for storing gravitational potential energy. The counterweight 3 is constructed using low-strength self-compacting concrete as a binder, binding a large number of stones to form an integral structure. This structural design significantly reduces cement usage while ensuring density and structural stability, improving economy and environmental friendliness, and enhancing the internal thermal insulation properties of the energy storage block.

[0042] In summary, the core-shell concrete gravity energy storage block provided in this application combines a high-performance outer shell 1 with an economical infill, which significantly reduces manufacturing costs and construction difficulty while meeting the requirements of strength and durability, and is suitable for the construction needs of modular energy storage units in various gravity energy storage projects.

[0043] In one embodiment, the lifting hole 4 is four equally spaced circular lifting holes provided on the top cover 2.

[0044] In one embodiment, the ultra-high performance self-compacting concrete used in the outer shell 1 is made by mixing materials such as PO 52.5 ordinary Portland cement, Class I fly ash, microsilica powder, quartz sand, fiber, polycarboxylate superplasticizer, and water in a certain proportion.

[0045] In one embodiment, the ultra-high performance self-compacting concrete has a spread of 550~700mm, a V-shaped funnel passage time of 5~25s, incorporates 1%~3% steel fiber by volume, has a compressive strength of 80~120MPa, and a flexural strength of 10~15MPa.

[0046] Specifically, in order to further improve the overall performance of the core-shell type concrete gravity energy storage block, the ultra-high performance self-compacting concrete (UHPC-SCC) used in the outer shell 1 and the top cover 2 has excellent mechanical properties and construction adaptability. Its mix proportions and performance indicators have been optimized to take into account strength, durability and flowability.

[0047] This ultra-high performance self-compacting concrete has a spread of 550~700mm, achieving good flowability and self-compacting effect without vibration. It is suitable for filling densely reinforced components and pouring complex structures. This spread range ensures uniform distribution of concrete within the structure while avoiding segregation and stratification problems caused by excessive flow.

[0048] In terms of fluidity testing, the V-shaped funnel passage time of the concrete was controlled within 5-25 seconds, indicating good cohesion and high internal viscosity, effectively preventing aggregate settling and slurry separation. This property is of great significance for forming a homogeneous shell structure and enhancing durability.

[0049] Furthermore, to enhance its crack and impact resistance, this ultra-high performance self-compacting concrete incorporates steel fibers at a volumetric dosage of 1% to 3%. The steel fibers form a three-dimensional reinforcing network within the concrete, effectively dispersing stress concentration and significantly improving the structure's resistance to complex environments such as vertical shocks and climate changes.

[0050] In terms of mechanical properties, the concrete exhibits a compressive strength of 80-120 MPa and a flexural strength of 10-15 MPa at 28 days under standard curing conditions, far exceeding the performance levels of conventional structural concrete. This high-strength material provides a solid guarantee for the high-frequency use of the energy storage blocks, ensuring they are not easily damaged or peeled off during long-term lifting and lowering operations.

[0051] In summary, the ultra-high performance self-compacting concrete used in this embodiment has both good workability and excellent structural performance, and is the key material basis for achieving high reliability and strong durability of core-shell gravity energy storage blocks.

[0052] In one embodiment, the longitudinal reinforcement of the outer shell 1 uses HRB500 or HRB600 grade steel bars, and the minimum longitudinal reinforcement ratio is not less than 0.7% and not more than 5%.

[0053] Specifically, such as Figure 4 As shown, in order to ensure that the shell 1 of the core-shell concrete gravity energy storage block has sufficient structural strength and crack resistance, the shell 1 is provided with longitudinal reinforcement to resist the axial stress and impact load generated during hoisting, lifting and long-term service.

[0054] The longitudinal reinforcement uses HRB500 or HRB600 grade high-strength steel bars at a certain reinforcement ratio. These hot-rolled ribbed steel bars have high yield strength and good ductility, and can work effectively with high-performance concrete, playing a dual role in the shell structure as a load-bearing skeleton and controlling crack development.

[0055] To ensure effective reinforcement while maintaining construction rationality, the longitudinal reinforcement ratio is strictly controlled. Specifically, the minimum reinforcement ratio is no less than 0.7% to ensure the concrete's crack control under stress; simultaneously, to avoid excessive stiffness and increased costs due to over-reinforcement, the reinforcement ratio does not exceed 5%. Minimum longitudinal reinforcement ratio The following constraints must be satisfied:

[0056] (1)

[0057] Among them, A s and A s′ A represents the cross-sectional area of ​​the reinforcing bars in the compression and tension zones, and A represents the total cross-sectional area of ​​the member.

[0058] The longitudinal reinforcement design not only meets the basic requirements of the concrete structure design code, but also takes into account various complex stress factors such as hoisting tension, internal block extrusion, and environmental fatigue in the actual working conditions of the energy storage block, thereby improving the structural integrity and long-term service reliability of the entire shell system.

[0059] Therefore, the longitudinal reinforcement method adopted in this embodiment significantly enhances the performance stability of the concrete shell 1 under cyclic loading, while taking into account structural safety, construction feasibility and economy.

[0060] In one embodiment, the spacing of the transverse stirrups of the outer shell 1 is not greater than 15 times the diameter of the longitudinal reinforcement or 400 mm, and the diameter is not less than 1 / 4 of the diameter of the longitudinal reinforcement.

[0061] Specifically, such as Figure 4 As shown, in order to further improve the shear resistance and ductility of the shell 1 of the core-shell type concrete gravity energy storage block, in addition to the longitudinal reinforcement, the shell 1 is also equipped with transverse stirrups to effectively restrain the longitudinal reinforcement and enhance the crack resistance and impact resistance of the overall structure.

[0062] Transverse stirrups are constructed using HRB500 or HRB600 grade high-strength steel bars at a specific reinforcement ratio. The geometric arrangement, structural dimensions, and volumetric stirrup ratio of the stirrups should meet the comprehensive requirements of structural safety and construction feasibility. The spacing of the stirrups should not exceed 15 times the longitudinal reinforcement diameter or 400 mm, whichever is smaller. This spacing control standard helps to form a sufficiently dense stirrup ring effect, preventing cracking, spalling, or structural instability of the concrete under localized stress.

[0063] Meanwhile, to ensure that the stirrups can work in conjunction with the longitudinal reinforcement, the diameter of the stirrups shall not be less than 1 / 4 of the diameter of the longitudinal reinforcement. This proportional restriction not only meets the minimum stiffness requirements, but also facilitates on-site binding, positioning, and spatial coordination during concrete pouring, effectively improving the stability of the structure.

[0064] Through the above-mentioned arrangement, the stirrups play a significant role in structural constraint and shear reinforcement in the shell 1 of the core-shell structure. In particular, when the heavy block is repeatedly lifted and lowered to generate dynamic loads or tilted forces, it can significantly delay crack propagation and structural instability, and improve the reliability and service life of the energy storage block under complex working conditions.

[0065] Therefore, the stirrup design in this embodiment not only meets the specifications, but also fully takes into account the special stress characteristics of gravity energy storage application scenarios, achieving an effective balance between structural safety and durability.

[0066] In one embodiment, the volumetric stirrup ratio satisfies the following constraint:

[0067] (2)

[0068] Among them, A sv λ is the total cross-sectional area of ​​the stirrups, b is the width of the stirrup's effective area, h is the height of the stirrup's effective area, s is the stirrup spacing, and λ is the total cross-sectional area of ​​the stirrups. v f is the minimum stirrup characteristic value. c f is the compressive strength of concrete. yv This represents the tensile strength of the stirrups.

[0069] In one embodiment, the outer shell 1 has a thickness of 15-30 cm to form a high-strength protective layer.

[0070] Specifically, to ensure that the core-shell concrete gravity energy storage block has good structural stability and resistance to external forces under multiple lifting, impact and long-term service conditions, the outer shell 1 is designed as a high-strength protective layer with a certain thickness.

[0071] The thickness of the outer shell 1 is set to 15~30cm. This thickness range is determined based on a comprehensive consideration of factors such as structural strength, structural rigidity, ease of construction, and material cost. An outer shell 1 with a thickness of less than 15cm may not be able to withstand the impact load and lateral compressive force generated during high-frequency lifting, while an outer shell 1 with a thickness of more than 30cm will lead to material waste and increased self-weight, which is not conducive to hoisting and overall energy efficiency.

[0072] The ultra-high performance self-compacting concrete used in the outer shell 1 has high compressive strength, crack resistance and wear resistance. With the reinforcement, the structural layer of this thickness can effectively form a high-strength protective barrier to prevent concrete spalling, cracking and early deterioration caused by external forces such as collision and friction during construction, hoisting or operation.

[0073] In addition, the protective layer of this thickness can provide sufficient lateral restraint for the internally filled counterweight 3, preventing the shell from bulging or cracking due to inertial motion during the lifting and lowering of the gravity energy storage block, thereby enhancing the safety and service life of the overall structure.

[0074] Therefore, by setting the outer shell thickness to 15~30cm in this embodiment, structural safety is ensured while material utilization efficiency and economy are taken into account, making it suitable for large-scale engineering applications that meet both performance and cost requirements.

[0075] In one embodiment, the low-strength self-compacting concrete has a spread of 650-700 mm, a V-shaped funnel passage time of 5-25 seconds, and a compressive strength of 10-25 MPa.

[0076] Specifically, to balance economy and construction performance, the counterweight block 3 of the core-shell concrete gravity energy storage block uses low-strength self-compacting concrete as the binder to effectively encapsulate and solidify the boulders. While maintaining relatively low strength requirements, the concrete's fluidity and construction adaptability are optimized to meet the requirements of encapsulating irregular, large-diameter boulders under non-vibration conditions.

[0077] This low-strength self-compacting concrete has a spread of 650~700mm and good fluidity. It can naturally fill the gaps between the stones and achieve self-compactment during the pouring process, avoiding quality problems such as voids, debonding, or honeycomb pitting caused by insufficient construction.

[0078] In addition, the V-shaped funnel of the concrete passes through in a time of 5 to 25 seconds, indicating that it has moderate cohesiveness and viscosity, which is beneficial for filling gaps and preventing stone settling and slurry segregation, thus maintaining the uniformity and stability of the internal structure of the counterweight block 3.

[0079] In terms of strength, the concrete has a compressive strength of 10~25MPa after 28 days under standard curing conditions, which can meet the basic requirements for the bonding effect of counterweight block 3 and ensure that the block maintains structural integrity under the lifting and lowering of gravity energy storage block and long-term static load conditions.

[0080] By using this type of low-strength self-compacting concrete with reasonable performance, it is possible to achieve self-compaction during construction, reduce vibration and manual intervention, reduce cement usage and hydration heat effect, effectively control the volume shrinkage and temperature crack risk of counterweight block 3, and improve structural reliability and economy.

[0081] Therefore, the low-strength self-compacting concrete selected in this embodiment achieves an optimized balance between material proportions and process performance while meeting functional requirements, making it an ideal choice for constructing large-volume economical counterweight structures.

[0082] In one embodiment, the C10~C15 low-strength self-compacting concrete used in the counterweight 3 is made by mixing PO 42.5 ordinary Portland cement, Class II fly ash, 5~20mm continuously graded crushed stone, polycarboxylate superplasticizer, water and other materials in a certain proportion.

[0083] In one embodiment, the stone is a large-diameter hard stone with a diameter of 150mm to 3000mm, and not larger than 1 / 3 of the long side dimension of the core-shell concrete gravity energy storage block.

[0084] Specifically, in order to reduce the material cost of counterweight 3 and improve its structural performance, such as Figure 5 As shown, the counterweight 3 is filled with a large number of stones, which are... Figure 5 Low-strength self-compacting concrete was poured in the direction of the center arrow to encapsulate and bind the stones into a whole. These stones not only serve as the main mass carrier but also improve the thermal stability and economy of counterweight block 3 to a certain extent.

[0085] The boulders are large-diameter, hard stones, which can be sourced from construction site waste rock, scrap stones from building demolition, or other naturally available hard stones. This material selection strategy enables on-site resource utilization and effectively saves on material procurement and transportation costs.

[0086] To ensure uniformity of filling and structural stability, the particle size range of the pebbles is 150mm to 3000mm. Stones within this range contribute sufficient mass while achieving proper stacking and bonding within the structure. Too small a particle size results in large voids and an increased concrete bonding area, hindering material conservation; too large a particle size leads to difficulties in encapsulation and may even affect the overall compactness of the pouring.

[0087] Furthermore, to prevent individual stones from causing localized cracking or stress concentration in the shell, the maximum particle size of the stones is limited to no more than 1 / 3 of the long side dimension of the core-shell concrete gravity energy storage block. For example, when the long side dimension of the energy storage block is 3000mm, the upper limit of the stone particle size is controlled within 1000mm, effectively balancing the stacking stability and the shell safety.

[0088] Through the above-mentioned particle size control and material selection, the boulders significantly reduced cement usage and hydration heat release while ensuring the overall density and quality of the energy storage blocks, thereby improving the structural rationality and environmental and economic performance of counterweight block 3.

[0089] In one embodiment, the overall density of the counterweight 3 is 2400~2600 kg / m³.

[0090] Specifically, to ensure sufficient energy storage capacity of the core-shell concrete gravity energy storage block, its internal counterweight 3 needs to provide sufficient mass to achieve the target gravitational potential energy conversion efficiency. Therefore, the overall density of the counterweight 3 is strictly controlled within a reasonable range.

[0091] The density of counterweight 3 is 2400~2600 kg / m³. This density range is achieved by reasonably combining low-strength self-compacting concrete and boulders, ensuring that counterweight 3 has a high mass contribution per unit volume, thereby generating greater gravitational potential energy at the same lifting height, which is beneficial to improving energy storage efficiency.

[0092] The key to density control lies in the selection and proportion of materials: self-compacting concrete typically has a density of about 2200~2400 kg / m³, while the density of large-diameter aggregates (such as granite, basalt, etc.) is generally 2600~2800 kg / m³. Mixing and bonding the two in an appropriate proportion can effectively and stably control the overall density between 2400~2600 kg / m³.

[0093] This density range not only meets the unit mass requirements of gravity energy storage systems but also achieves higher energy storage loads without significantly increasing volume or size. Simultaneously, this design avoids transportation and hoisting difficulties caused by excessive weight, ensuring the constructability and safety of the structure.

[0094] Therefore, through density optimization design, this embodiment enables the counterweight 3 to meet the comprehensive requirements of high-efficiency gravity energy storage system in terms of mass, volume and construction adaptability while taking into account structural feasibility and material economy.

[0095] In one embodiment, the overall block stone ratio of the counterweight 3 is 50% to 60%.

[0096] Specifically, in order to further reduce material costs, reduce the risk of volume deformation caused by cement hydration heat, and improve the economic and environmental performance of the structure, the design focus of the counterweight block 3 in the core-shell concrete gravity energy storage block is to reasonably increase the filling ratio of the stone blocks.

[0097] The overall boulders ratio of counterweight block 3 is 50%~60%, meaning that the volume proportion of boulders in the total volume of counterweight block 3 is controlled within the above range. This boulders ratio was determined through extensive testing and optimization, ensuring both structural stability and pouring density.

[0098] A higher proportion of boulders can significantly reduce the amount of cement and fine aggregate used, thereby reducing the heat of hydration and lowering the risk of early-stage temperature cracking in concrete. At the same time, reducing the amount of binder material also means a significant decrease in the material cost per unit counterweight block 3, especially when boulders can be sourced locally, further improving resource utilization efficiency.

[0099] However, to ensure structural integrity and overall density, the boulders ratio must be kept within a certain upper limit. If it exceeds 60%, the binding force of the cementing material will be insufficient, and gaps will easily form between the boulders, affecting the strength and durability of the counterweight block 3; if it is below 50%, the amount of cement used will increase, negating the advantages of material saving and environmental protection. Therefore, controlling the boulders ratio within the range of 50% to 60% allows for sufficient filling of the internal space while balancing economy and structural performance.

[0100] In summary, this embodiment achieves a balance between lightweight efficiency and ease of construction by rationally setting the stone filling ratio, thus satisfying the dual optimization goals of modern gravity energy storage systems for large-volume counterweight structures in terms of both performance and cost.

[0101] In one embodiment, the counterweight 3 is broken down and recycled after damage, and used as recycled aggregate blocks for the production of new counterweight 3.

[0102] Specifically, in order to further improve the sustainability and resource utilization efficiency of the core-shell concrete gravity energy storage block, the counterweight block 3 is designed to have good recyclability and reuse capabilities.

[0103] When the energy storage block suffers severe structural damage due to external impact, freeze-thaw damage, or operational fatigue during long-term use, the counterweight block 3 can be disassembled and its constituent stones recycled for use in the construction of a new counterweight block 3. Stone materials that meet the strength and dimensional requirements after inspection can be directly incorporated into the new counterweight structure as recycled aggregate stones, continuing to participate in the bonding and molding process of low-strength self-compacting concrete.

[0104] This recycling and reuse method offers advantages such as saving material costs, shortening the construction cycle, being environmentally friendly, and simplifying processing. Therefore, by introducing a recyclable mechanism into the structure of the counterweight block 3, this embodiment not only improves the overall economic efficiency and environmental friendliness of the core-shell concrete gravity energy storage block, but also enhances the system's operational flexibility and resource closed-loop utilization capability during long-term operation.

[0105] In one embodiment, the manufacturing process of the core-shell concrete gravity energy storage block of this application includes the following steps: After the steel frame is fixed to the formwork, ultra-high performance self-compacting concrete is poured in. After curing, the formwork is removed to obtain an ultra-high performance concrete reinforced outer shell 1, forming a high-strength protective layer. Large-diameter stones are randomly placed into the filling space inside the outer shell 1, and low-strength self-compacting concrete is used to bond the large-diameter stones to obtain counterweight blocks 3. Finally, the top cover 2 of the outer shell 1 is poured to seal it, forming a complete core-shell concrete gravity energy storage block, and a lifting hole 4 is provided for connecting the drive equipment to the core-shell concrete gravity energy storage block.

[0106] This application provides a core-shell type concrete gravity energy storage block, comprising: an outer shell, a top cover, and a counterweight block; the outer shell is cast from ultra-high performance self-compacting concrete and is provided with longitudinal reinforcement and transverse stirrups to form a protective shell; the top cover is located on top of the outer shell and has multiple lifting holes for connecting to a drive device; the top cover and the lifting holes are cast from ultra-high performance self-compacting concrete; the counterweight block fills the filling space formed by the outer shell and is formed by low-strength self-compacting concrete cemented blocks. The core-shell type concrete gravity energy storage block provided by this application significantly reduces the construction cost and environmental impact of gravity energy storage blocks while ensuring structural strength and durability.

[0107] The gravity energy storage block of this application takes into account the ease of construction, structural durability, and economic and environmental benefits in its structural design and material selection: both its internal and external shells are made of self-compacting concrete, eliminating the need for vibration compaction and making construction more convenient; the shell is made of reinforced ultra-high performance self-compacting concrete, which has excellent strength, durability and impact and abrasion resistance, effectively preventing the lifespan of the block from being affected by edge damage during repeated lifting and lowering; the counterweight is made of low-strength self-compacting concrete bonded with large-diameter stones, which significantly reduces the amount of cement used, reduces the risk of volume shrinkage and cracking caused by heat of hydration, and the stone material can be sourced locally, significantly reducing construction costs and possessing good economic, environmental and thermal insulation properties.

[0108] In the description of this specification, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0109] The terms "an embodiment," "a specific embodiment," "some embodiments," "for example," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The order of steps involved in the various embodiments is used to illustrate the implementation of this application, and the order of steps is not limited and may be adjusted appropriately as needed.

[0110] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0111] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A core-shell type concrete gravity energy storage block, characterized in that, include: Outer shell, top cover, and counterweight; The outer shell is made of ultra-high performance self-compacting concrete and is equipped with longitudinal reinforcement and transverse stirrups to form a protective shell. The top cover is located on the top of the outer shell and has multiple lifting holes for connecting to the drive equipment; the top cover and the lifting holes are made of ultra-high performance self-compacting concrete. The counterweight is filled in the filling space formed by the outer shell and is formed by low-strength self-compacting concrete cemented blocks.

2. The core-shell concrete gravity energy storage block according to claim 1, characterized in that, The ultra-high performance self-compacting concrete has a spread of 550~700mm, a V-shaped funnel passage time of 5~25s, incorporates 1%~3% steel fiber by volume, has a compressive strength of 80~120MPa, and a flexural strength of 10~15MPa.

3. The core-shell concrete gravity energy storage block according to claim 1, characterized in that, The longitudinal reinforcement of the outer shell uses HRB500 or HRB600 grade steel bars, with a minimum longitudinal reinforcement ratio of not less than 0.7% and not more than 5%.

4. The core-shell concrete gravity energy storage block according to claim 3, characterized in that, The spacing of the transverse stirrups of the outer shell is not greater than 15 times the diameter of the longitudinal reinforcement or 400 mm, and the diameter is not less than 1 / 4 of the diameter of the longitudinal reinforcement.

5. The core-shell concrete gravity energy storage block according to claim 1, characterized in that, The outer shell has a thickness of 15-30cm and is used to form a high-strength protective layer.

6. The core-shell type concrete gravity energy storage block according to claim 1, characterized in that, The low-strength self-compacting concrete has a spread of 650-700mm, a V-shaped funnel passage time of 5-25 seconds, and a compressive strength of 10-25MPa.

7. The core-shell type concrete gravity energy storage block according to claim 1, characterized in that, The stones are large-diameter hard stones with a diameter of 150mm to 3000mm, and are no larger than 1 / 3 of the long side dimension of the core-shell concrete gravity energy storage block.

8. The core-shell type concrete gravity energy storage block according to claim 1, characterized in that, The overall density of the counterweight is 2400~2600 kg / m³.

9. The core-shell type concrete gravity energy storage block according to claim 1, characterized in that, The overall block stone ratio of the counterweight is 50% to 60%.

10. The core-shell concrete gravity energy storage block according to claim 1, characterized in that, The counterweight blocks are broken down and recycled after damage, and used as recycled aggregate blocks for the production of new counterweight blocks.

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