Multistage nested cubic lattice enhanced gradient explosion-proof wall and preparation method thereof
By combining multi-level nested cubic lattice structures with graded concrete materials, the problem of brittle failure of traditional cement-based materials and metal lattice structures under explosive loads is solved, achieving high-efficiency anti-explosive impact performance and convenient construction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-06
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional cement-based materials are prone to brittle failure under explosive loads. Metal lattice structures lack sufficient mass and stiffness when facing explosive shock waves and fragments, making it difficult to effectively attenuate stress waves. Existing composite materials have insufficient protection capabilities under near-field explosions.
By adopting a multi-level nested cubic lattice structure and combining it with graded concrete materials, multi-level energy absorption and dissipation are achieved through gradient design. The multi-level gradient nested cubic structure and concrete filling layers with different properties work synergistically to enhance the anti-blast performance.
It significantly improves the impact resistance, penetration resistance and crack resistance of the explosion-proof wall, achieving efficient dissipation of explosive impact energy while taking into account both construction convenience and structural performance.
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Figure CN121803100A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of protective engineering materials, and particularly relates to a multi-stage nested cubic lattice reinforced gradient blast wall and a preparation method. BACKGROUND
[0002] Traditional cement-based materials (such as concrete) are widely used in military fortifications and protective structures due to their high compressive strength and low cost. However, their inherent brittleness, poor tensile and impact toughness, lead to easy cracking and crushing damage under explosive loading. Although the toughness can be improved to some extent by adding fibers (such as steel fibers, PVA fibers) to the concrete, its protective ability is still insufficient for high strain rate loads generated by near-field explosions.
[0003] Metal lattice structures (such as pyramid lattice, honeycomb structure) are known for their ultra-light weight, high specific strength, and high energy absorption efficiency, showing great potential in aerospace and underwater blast resistance. However, pure metal lattice structures often lack sufficient mass and stiffness to effectively attenuate stress waves when facing explosive shock waves and fragments. Cement-based composites have good compressive performance and durability, but have low tensile strength, high brittleness, and are prone to brittle failure under impact loading. How to combine the excellent mechanical properties of metal lattice structures with the cost advantage and durability of cement-based composites to develop a new type of composite material with excellent impact and blast protection performance is a technical problem that needs to be solved in the current protective material field.
[0004] Therefore, developing a new type of composite material that can fully utilize the advantages of metal lattice and cement-based composite materials, and achieve optimal blast resistance through gradient design, has become a technical problem that needs to be solved in the field. SUMMARY
[0005] The purpose of the present application is to provide a multi-stage nested cubic lattice reinforced gradient blast wall and a preparation method, which effectively improves the anti-blast impact ability through multi-stage energy absorption mechanism, and prevents the concrete wall from cracking or crushing under strong dynamic load.
[0006] In order to achieve the above purpose, the technical scheme adopted is as follows: In a first aspect, the present application provides a multi-stage gradient explosion-proof wall body reinforced by a nested cubic lattice, comprising a multi-stage gradient nested cubic structure and a graded concrete material filled in the voids thereof; the multi-stage gradient nested cubic structure is a porous metal lattice skeleton, comprising a first-stage nested cubic structure layer, a second-stage nested cubic structure layer and a third-stage nested cubic structure layer nested in sequence, and the diameters or wall thicknesses of the lattice rods gradually increase from the first-stage nested cubic structure layer to the second-stage nested cubic structure layer and then to the third-stage nested cubic structure layer, and the relative density is distributed in a gradient increasing manner; the graded concrete material is correspondingly filled in each structure layer to form a first-stage cement filling layer, a second-stage cement filling layer and a third-stage cement filling layer.
[0007] Further, the basic unit of the multi-stage gradient nested cubic structure is a nested cubic cell skeleton 100, and the rod nodes of the nested cubic cell skeleton adopt a four-way branching structure.
[0008] Further, the rod lengths of the rods are all the same, and the diameters of the rods are controlled within a range of 3mm-10mm.
[0009] Further, the first-stage cement filling layer is a high-performance cement-based composite material containing graphene oxide GO and steel fibers, wherein the volume fraction of the steel fibers is 1.5%-2.5%, and the graphene oxide content is 0.05%-0.15%.
[0010] Further, the second-stage cement filling layer is C30 concrete, and the compressive strength thereof is not less than 30MPa.
[0011] Further, the third-stage cement filling layer is ordinary foam concrete, and the density thereof is 400-800kg / m 3 .
[0012] Further, the multi-stage gradient nested cubic structure is made of 316L stainless steel.
[0013] In a second aspect, the present application provides a preparation method of the multi-stage gradient explosion-proof wall body reinforced by a nested cubic lattice, comprising the following steps: Step one: preparing a multi-stage gradient nested cubic structure; Step two: performing surface treatment on the multi-stage gradient nested cubic structure and fixing it in a prefabricated mold; Step three: preparing and pouring the graded concrete material in layers, pouring the corresponding concrete material into the first-stage nested cubic structure layer, the second-stage nested cubic structure layer and the third-stage nested cubic structure layer in sequence, and ensuring vibration compaction to form the first-stage cement filling layer, the second-stage cement filling layer and the third-stage cement filling layer; Step 4: Perform standard curing. Once the concrete reaches the design strength, demold to obtain the finished wall.
[0014] Furthermore, in step one, the multi-level gradient nested cubic structure is prepared by metal additive manufacturing or rod assembly and welding process.
[0015] Furthermore, in step four, the curing environment is a temperature of 20±2℃ and a relative humidity of over 95%, and the curing time is 28 days, during which time the environment is covered with plastic film.
[0016] The beneficial effects of this invention are reflected in: This invention achieves multi-level absorption and efficient dissipation of explosive impact energy through the synergistic effect of nested cubic gradient lattice design and concrete materials; the gradient lattice structure combined with concrete filling materials with different properties significantly improves the impact resistance, penetration resistance and crack resistance of the explosion-proof wall; the construction method combining modular prefabrication and on-site assembly takes into account both structural performance and construction convenience, and is suitable for a variety of protection engineering scenarios. Attached Figure Description
[0017] Figure 1 A three-dimensional structural diagram of nested cubic cells used in a gradient explosion-proof wall reinforced with a multi-level nested cubic lattice, provided in an embodiment of the present invention; Figure 2 A front view of a nested cubic cell skeleton in a gradient explosion-proof wall reinforced with a multi-level nested cubic lattice, provided in an embodiment of the present invention; Figure 3 A side view of a nested cubic cell skeleton in a gradient explosion-proof wall reinforced with a multi-level nested cubic lattice, provided in an embodiment of the present invention; Figure 4 This is a top view of a multi-level nested cubic lattice reinforced gradient explosion-proof wall provided in an embodiment of the present invention, showing a nested cubic cell skeleton. Figure 5 A three-dimensional structural diagram of a multi-level gradient nested cube structure in a gradient explosion-proof wall reinforced with a multi-level nested cube lattice is provided for an embodiment of the present invention. Figure 6 A three-dimensional structural diagram of a cement-based composite reinforced with a multi-level gradient nested cubic structure in a gradient explosion-proof wall reinforced with a multi-level nested cubic lattice is provided for an embodiment of the present invention. Figure 7 Stress cloud diagram of gradient wall and internal gradient skeleton with simulated multi-level nested cube lattice reinforcement provided in the embodiments of the present invention; Figure 8 A comparison chart of the impact projectile velocity time history curves of the wall and the conventional C30 concrete wall provided in this embodiment of the invention; Figure 9 A comparison chart of the impact projectile displacement time history curves of the wall and the conventional C30 concrete wall provided in the embodiments of the present invention.
[0018] Explanation of reference numerals in the attached figures: 100. Nested cubic cell skeleton; 101. Rod; 200. Multi-level gradient nested cubic structure; 201. First-level nested cubic structure layer; 202. Second-level nested cubic structure layer; 203. Third-level nested cubic structure layer; 300. Cement-based composite reinforced with multi-level gradient nested cubic structure; 301. First-level cement filling layer; 302. Second-level cement filling layer; 303. Third-level cement filling layer. Detailed Implementation
[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.
[0020] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.
[0021] Example 1: This invention provides a gradient explosion-proof wall reinforced with a multi-level nested cubic lattice, such as... Figures 1 to 6 As shown, the multi-level nested cubic lattice reinforced gradient explosion-proof wall includes a multi-level gradient nested cubic structure 200 and graded concrete material filling its gaps. The multi-level gradient nested cubic structure 200 is a porous metal lattice skeleton, including a first-level nested cubic structure layer 201, a second-level nested cubic structure layer 202, and a third-level nested cubic structure layer 203 nested sequentially. From the first-level nested cubic structure layer 201 to the second-level nested cubic structure layer 202 and then to the third-level nested cubic structure layer 203, the diameter or wall thickness of the lattice rods 101 gradually increases, and the relative density is distributed in a gradient increasing manner. The graded concrete material is filled in each structural layer to form a first-level cement filling layer 301, a second-level cement filling layer 302, and a third-level cement filling layer 303. The first-level cement filling layer 301, the second-level cement filling layer 302, and the third-level cement filling layer 303 are combined to form a multi-level gradient nested cubic structure reinforced cement-based composite 300.
[0022] This multi-level nested cubic lattice reinforced gradient explosion-proof wall works on the synergistic effect of the multi-level gradient nested cubic structure 200 and graded concrete materials to achieve efficient, stepwise dissipation of explosive impact energy. When an impact load is applied to the blast-facing surface of the wall, it is initially borne by the first-level nested cubic structure layer 201 and its internal first-level cement filling layer 301. The lattice members 101 in this layer are small in size and have a relatively low density, and under the action of the explosive stress wave, they undergo plastic deformation, buckling, and even partial crushing first, thereby absorbing and dissipating a large amount of initial impact energy and effectively reducing the peak value of the stress wave. Subsequently, the attenuated stress wave is transmitted to the second-level nested cubic structure layer 202 and the second-level cement filling layer 302. The diameter or wall thickness of the members 101 in this layer increases, and the relative density of the skeleton and the strength of the filling concrete are improved, further hindering the propagation of the shock wave, resisting the penetration of projectiles or fragments, and dissipating the remaining energy through continuous plastic deformation. Finally, the remaining load reaches the third-level nested cubic structure layer 203 and the third-level cement-filled layer 303 on the back-explosion side. This layer has the largest member size and skeleton density, and combined with lightweight buffer foamed concrete, it provides final rigid support to the main structure and absorbs residual energy, preventing collapse, spalling, or pulverization of the back wall. Throughout the process, the gradient-designed lattice skeleton is coupled with infill materials of varying properties, causing the impact stress wave to be repeatedly weakened and delayed along its propagation path, such as... Figure 7 As shown, the damage exhibits a clear multi-level attenuation, thereby comprehensively improving the wall's impact resistance, penetration resistance, and overall blast resistance.
[0023] A feasible case is as follows: First, using selective laser melting (SLM) metal additive manufacturing technology and 316L stainless steel powder, a three-layer gradient lattice framework, namely a multi-level gradient nested cubic structure 200, is fabricated. The rods 101 constituting the first-level nested cubic structure layer 201 have a diameter of 4 mm, the rods in the second-level nested cubic structure layer 202 have a diameter of 7 mm, and the rods in the third-level nested cubic structure layer 203 have a diameter of 10 mm. The rod lengths remain consistent, and the nodes have a four-branched structure. After surface cleaning, the fabricated framework is placed and fixed in a custom-made steel mold. Subsequently, graded concrete pouring is performed: a high-performance cement-based composite material containing 0.08% graphene oxide by mass and 2.0% steel fiber by volume is injected into the voids of the first-level structural layer, and after compaction, it forms the first-level cement filling layer 301; next, ordinary concrete with a nominal strength of C30 is poured into the voids of the second-level structural layer, forming the second-level cement filling layer 302; finally, foamed concrete with a density of 550 kg / m³ is poured into the voids of the third-level structural layer, forming the third-level cement filling layer 303. After pouring, the entire composite is covered with a water-retaining film and cured for 28 days in a standard curing room with a temperature of 20±2 degrees Celsius and a relative humidity of not less than 95%. After the concrete strength reaches the standard, it is demolded, resulting in the multi-level gradient nested cubic structure reinforced cement-based composite 300, i.e., the finished explosion-proof wall. Figure 8 and Figure 9 The comparison curves show that this structure can reduce projectile velocity and penetration depth more rapidly than a homogeneous C30 concrete wall.
[0024] It should be noted that the above feasible cases are merely examples to illustrate the implementation of this technical solution. In practical applications, the number of layers in the multi-level gradient nested cube structure 200, the specific dimensions of the members 101, the metal materials used, and the material ratios and performance parameters of each gradient cement filling layer 301, 302, and 303 can all be adaptively adjusted and optimized according to different protection level requirements, cost constraints, and construction conditions.
[0025] In some embodiments, such as Figure 1 As shown, the basic unit of the multi-level gradient nested cube structure 200 is the nested cube cell skeleton 100. The member nodes of the nested cube cell skeleton 100 adopt a specific four-branch structure, in which the included angle between two intersecting members 101 in space is set to approximately 109.47°. This angle design originates from the central angle of a regular tetrahedron, enabling more balanced force distribution at the nodes, thus forming a mechanically highly stable and approximately isotropic spatial support network. This stable cell structure provides an excellent load-bearing foundation and deformation coordination capability for the entire multi-level gradient nested cube structure 200, and is an important foundation for the wall to achieve efficient energy dissipation.
[0026] In some embodiments, such as Figures 1 to 4 As shown, the structure of the nested cubic cell skeleton 100 is further optimized, wherein all the rods 101 constituting the cell have the same length. Simultaneously, the diameter of the rods 101 is precisely controlled within the range of 3 mm to 10 mm. This design ensures the geometric regularity and symmetry of the basic cells, providing a standardized module for constructing larger-scale multi-level gradient nested cubic structures 200. The uniform rod length facilitates design and manufacturing, while the given diameter range provides a feasible and flexible selection space for achieving gradient changes between structural layers (the diameter gradually increases from the first-level structural layer 201 to the third-level structural layer 203), enabling the skeleton to precisely control the relative density and mechanical properties of each region while maintaining overall integrity.
[0027] In some embodiments, such as Figure 6 As shown, the first-stage cement filler layer 301 is made of a high-performance cement-based composite material. This composite material incorporates two key reinforcing phases: graphene oxide (GO) and steel fibers. The volume fraction of steel fibers is controlled between 1.5% and 2.5%, while the amount of graphene oxide (GO) is controlled between 0.05% and 0.15% of the cement matrix mass. The addition of graphene oxide (GO) effectively refines the microstructure of the cement matrix, enhancing its density and toughness; while the discretely distributed steel fibers bridge microcracks, providing significant toughening and tensile strength. This synergistic effect of the two materials allows the first-stage cement filler layer 301 to achieve high compressive strength while also possessing excellent impact toughness, crack resistance, and energy absorption capacity. This allows it to be well-matched with the metal lattice framework of the first-stage nested cubic structure layer 201, undergoing controlled deformation together under initial explosive impact, thereby maximizing energy dissipation.
[0028] In some embodiments, such as Figure 6 As shown, the second-level cement filling layer 302 uses C30 concrete as the filling material, with a standard cubic compressive strength of not less than 30 MPa. This concrete layer serves as the core load-bearing and transition layer of the multi-level gradient nested cubic structure-reinforced cement-based composite 300, primarily bearing the impact loads attenuated from the first-level structure, and providing the main compressive and shear strength for the entire wall. C30 concrete is a mature, economical, and widely used structural material with stable and reliable performance. Its application in the second-level cement filling layer 302 forms an effective mechanical property gradient with the high-toughness first-level cement filling layer 301 and the lightweight buffer third-level cement filling layer 303, playing a crucial role in the overall structure. It ensures sufficient stiffness and strength in the middle section of the wall to resist penetration, and works in conjunction with the metal skeleton to further dissipate energy.
[0029] In some embodiments, such as Figure 6 As shown, the third-level cement filling layer 303 uses ordinary foamed concrete as the filling material, with a density controlled within the range of 400 kg / m³ to 800 kg / m³. This lightweight material mainly serves as a buffer and energy absorber. Its porous structure can effectively absorb and scatter residual stress waves after passing through the first two levels of the structure, and its low elastic modulus extends the load application time, further reducing the impact force. As the last major energy-absorbing layer on the back side of the wall, it combines with the relatively strongest and toughest third-level nested cubic structure layer 203 to jointly ensure that the back side of the wall does not experience fatal collapse, spalling, or debris splashing, significantly improving the safety and integrity of the protection.
[0030] In some embodiments, such as Figure 5 As shown, the metal material constituting the multi-level gradient nested cubic structure 200 is preferably 316L stainless steel. This material has good corrosion resistance, excellent formability, and high strength and toughness, making it particularly suitable for precisely forming complex gradient lattice structures using metal additive manufacturing processes such as selective laser melting (SLM). Using a skeleton made of 316L stainless steel not only meets the gradient requirements of each gradient level for the mechanical properties of the rods 101, but also ensures the durability of the entire metal lattice skeleton in long-term use environments, providing durable and reliable internal reinforcement support for the cement-based composite 300.
[0031] Figure 7 The stress cloud diagram of the invented device under the impact of a bullet is shown. It can be seen from the diagram that the stress wave generated by the impact exhibits a clear multi-level attenuation phenomenon under the action of a multi-level gradient wall, which greatly reduces the damage caused by the impact on the back of the invented wall.
[0032] Figure 8 and Figure 9 The velocity and displacement time history curves of a conventional C30 concrete wall and the invented multi-level nested cubic lattice reinforced gradient wall under projectile impact are shown. It can be concluded that the device of the present invention can significantly reduce the penetration depth of the projectile impact and the projectile velocity decreases more rapidly. This data proves that the multi-level nested cubic lattice reinforced gradient wall has excellent anti-penetration capability.
[0033] Example 2: This invention provides a method for preparing a gradient explosion-proof wall reinforced with multi-level nested cubic lattice as described in any embodiment of Embodiment 1, comprising the following steps: Step 1: Prepare a multi-level gradient nested cube structure 200.
[0034] The purpose of step one is to form a porous metal skeleton with gradient characteristics. This skeleton is the structural basis for multi-level energy dissipation, and its gradient geometry (such as changes in rod diameter) directly determines the deformation and energy absorption sequence of each structural layer. For example, selective laser melting (SLM) metal additive manufacturing can be used, with 316L stainless steel powder as the raw material, to print the entire multi-level gradient nested cubic structure 200 with diameter gradients in one step according to a three-dimensional digital model. Alternatively, a rod assembly and welding process can be used, i.e., metal rods 101 of different diameters are pre-processed and then connected at the nodes by welding, assembling the gradient skeleton layer by layer.
[0035] Step 2: Perform surface treatment on the multi-level gradient nested cube structure 200 and fix it in the prefabricated mold.
[0036] The purpose of step two is to optimize the interface between the skeleton and the concrete and ensure proper casting positioning. Surface treatments (such as sandblasting and acid pickling) can remove the oxide layer, increase surface roughness, and significantly improve the adhesion and mechanical bonding between the metal and concrete. Fixing the treated skeleton in the precast mold is to maintain its designed position and shape absolutely stable during subsequent casting, preventing displacement due to concrete flow or vibration. For example, the SLM-printed skeleton can be sandblasted and then suspended and positioned in the center of a sufficiently strong steel mold using a special clamp.
[0037] Step 3: Prepare and pour gradient concrete material in layers. Sequentially pour the corresponding concrete material into the first-level nested cube structure layer 201, the second-level nested cube structure layer 202, and the third-level nested cube structure layer 203, and ensure that the concrete is vibrated and compacted to form the first-level cement filling layer 301, the second-level cement filling layer 302, and the third-level cement filling layer 303.
[0038] Step three aims to achieve a graded composite of material functions. Concrete with corresponding properties is poured in layers, sequentially from the blast-facing side to the blast-repellent side, including high-performance fiber-reinforced composite material, ordinary concrete, and foamed concrete, ensuring a smooth transition and synergy of mechanical properties. Vibration compaction is used to eliminate air bubbles and ensure full filling, thereby eliminating internal defects and ensuring a tight bond between each cement filler layer (301, 302, 303) and its corresponding layer's skeleton (201, 202, 203). For example, the first-level cement filler layer 301 (GO-steel fiber mortar) can be poured first and thoroughly vibrated; after it has initially stabilized but not fully hardened, the second-level cement filler layer 302 (C30 concrete) can be poured; finally, the third-level cement filler layer 303 (foamed concrete) can be poured.
[0039] Step 4: Perform standard curing. Once the concrete reaches the design strength, demold to obtain the finished wall.
[0040] The purpose of step four is to ensure sufficient hydration of the cement-based materials through a standardized curing system, achieving the designed strength. Constant temperature and humidity curing is crucial for ensuring the strength development and durability of concrete (especially high-performance composites), and covering with a film effectively prevents moisture evaporation. For example, immediately after pouring and vibration, the mold opening is covered with a plastic film, and the mold is moved into a standard curing room or curing box with a temperature of 20±2℃ and a relative humidity maintained above 95%, for continuous curing for 28 days. After the strength test is passed, the mold is removed, yielding the final multi-level gradient nested cubic structure reinforced cement-based composite 300, i.e., the finished explosion-proof wall.
[0041] The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention, and the patent protection scope of the present invention should be defined by the claims.
Claims
1. A gradient explosion-proof wall reinforced with a multi-level nested cubic lattice, characterized in that, It includes a multi-level gradient nested cube structure (200) and graded concrete material filling its gaps; the multi-level gradient nested cube structure (200) is a porous metal lattice skeleton, including a first-level nested cube structure layer (201), a second-level nested cube structure layer (202) and a third-level nested cube structure layer (203) nested in sequence. From the first-level nested cube structure layer (201) to the second-level nested cube structure layer (202) and then to the third-level nested cube structure layer (203), the diameter or wall thickness of the lattice rods (101) gradually increases, and the relative density is distributed in a gradient increasing manner; the graded concrete material is filled in each structural layer to form a first-level cement filling layer (301), a second-level cement filling layer (302) and a third-level cement filling layer (303).
2. The gradient explosion-proof wall reinforced with multi-level nested cubic lattice as described in claim 1, characterized in that, The basic unit of the multi-level gradient nested cube structure (200) is the nested cube cell skeleton (100), and the rod nodes of the nested cube cell skeleton (100) adopt a four-branch structure.
3. The gradient explosion-proof wall reinforced with multi-level nested cubic lattice as described in claim 1, characterized in that, All the rods (101) have the same length, and the diameter of the rods (101) is controlled within the range of 3mm-10mm.
4. The gradient explosion-proof wall reinforced with multi-level nested cubic lattice as described in claim 1, characterized in that, The first-level cement filler layer (301) is a high-performance cement-based composite material containing graphene oxide (GO) and steel fibers, wherein the volume fraction of steel fibers is 1.5%-2.5% and the content of graphene oxide is 0.05%-0.15%.
5. The gradient explosion-proof wall reinforced with multi-level nested cubic lattice as described in claim 1, characterized in that, The second-level cement filling layer (302) is C30 concrete with a compressive strength of not less than 30MPa.
6. The gradient explosion-proof wall reinforced with multi-level nested cubic lattice as described in claim 1, characterized in that, The third-level cement filler layer (303) is ordinary foamed concrete with a density of 400-800 kg / m³. 3 .
7. The gradient explosion-proof wall reinforced with multi-level nested cubic lattice as described in claim 1, characterized in that, The multi-level gradient nested cube structure (200) is made of 316L stainless steel.
8. A method for preparing a gradient explosion-proof wall reinforced with a multi-level nested cubic lattice as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: Prepare a multi-level gradient nested cube structure (200); Step 2: Perform surface treatment on the multi-level gradient nested cube structure (200) and fix it in the prefabricated mold; Step 3: Prepare and pour gradient concrete material in layers. Sequentially pour the corresponding concrete material into the first nested cube structure layer (201), the second nested cube structure layer (202), and the third nested cube structure layer (203), and ensure that it is vibrated and compacted to form the first cement filling layer (301), the second cement filling layer (302), and the third cement filling layer (303). Step 4: Perform standard curing. Once the concrete reaches the design strength, demold to obtain the finished wall.
9. The preparation method according to claim 8, characterized in that, In step one, the multi-level gradient nested cubic structure (200) is prepared by metal additive manufacturing process or rod assembly and welding process.
10. The preparation method according to claim 8, characterized in that, In step four, the curing environment is a temperature of 20±2℃ and a relative humidity of over 95%, and the curing time is 28 days, during which time the environment is covered with plastic film.