A concrete structure with projectile yaw function and its preparation method

Abstract

This invention discloses a concrete structure with projectile yaw function and its preparation method, belonging to the field of building protection structure technology. It includes alternating positive and negative Poisson's ratio structural cells, both of which are hexagonal. The positive Poisson's ratio structural cells are filled with a first self-compacting self-stressing concrete, and the negative Poisson's ratio structural cells are filled with a second self-compacting self-stressing concrete. The compressive strengths of the first and second self-compacting self-stressing concretes are unequal. When impacted by a projectile, the honeycomb grid structure guides the projectile to a node position with better penetration resistance, thus guiding the projectile's deflection. This solves the problem of weak impact resistance of existing concrete protective structures when facing bunker buster penetration.

Description

Technical Field

[0001] This invention belongs to the field of building protection structure technology, and relates to a concrete structure with projectile yaw function and its preparation method. Background Technology

[0002] Currently, air-to-ground weapons are developing towards precision, high energy, and tactical application. A typical example is kinetic energy attack weapons, also known as "bulldozer bombs," which consist of a carrier and a penetrating warhead. They are characterized by deep penetration and delayed detonation, resulting in immense destructive power in tactical air strikes. The fundamental reason for the deep penetration of these weapons lies in the fact that their warheads are made of high-hardness alloys. The strength, toughness, and hardness of this material far exceed that of concrete, ensuring that the high-speed penetrating warhead is not only difficult to crack but also can continuously penetrate protective structures from the surface to the interior using its enormous kinetic energy.

[0003] Currently, in researching the penetration of bunker-buster bombs into concrete, there is an urgent need to develop a highly effective anti-penetration protective structure to effectively reduce the impact kinetic energy of the bombs. In ground-based or semi-ground-based defense engineering, simply increasing the thickness of the concrete protective layer to resist precision-guided attacks not only offers limited improvement in defensive capabilities and is inefficient, but also leads to a significant increase in the size and weight of the project. Summary of the Invention

[0004] This invention overcomes the shortcomings of existing technologies by proposing a concrete structure with projectile yaw function and its preparation method. It solves the problem of weak impact resistance of existing concrete protective structures when facing the penetration of bunker-buster bombs.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0006] A concrete structure with projectile yaw function includes alternating positive Poisson's ratio structural cells and negative Poisson's ratio structural cells, both of which are hexagonal structures. The positive Poisson's ratio structural cells are filled with a first self-compacting self-stressing concrete, and the negative Poisson's ratio structural cells are filled with a second self-compacting self-stressing concrete. The compressive strengths of the first and second self-compacting self-stressing concretes are not equal.

[0007] Preferably, both the inner walls of the positive Poisson's ratio structural cell and the inner walls of the negative Poisson's ratio structural cell are provided with fitting ribs.

[0008] Preferably, the compressive strength is 100MPa-150MPa.

[0009] Preferably, the compressive strength of the first self-compacting self-stressing concrete is 100 MPa, and the compressive strength of the second self-compacting self-stressing concrete is 150 MPa.

[0010] Even better, both the first and second self-compacting self-stressing concretes are filled with corundum spheres.

[0011] Preferably, both the first self-compacting self-stressing concrete and the second self-compacting self-stressing concrete are filled with metal fibers.

[0012] Even better, a grouting pipe with an electromagnetic coil wound around its outer wall is used to grout the first self-compacting self-stressing concrete and the second self-compacting self-stressing concrete.

[0013] Preferably, both the positive Poisson's ratio structural cell and the negative Poisson's ratio structural cell are made of low-carbon steel profiled steel sheet.

[0014] Preferably, alternating positive Poisson's ratio structural cells and negative Poisson's ratio structural cells form a honeycomb grid cell structure, and the upper and lower surfaces of the honeycomb grid cell structure are provided with clamps for easy construction.

[0015] A method for preparing a concrete structure with projectile yaw function includes the following steps:

[0016] 1) Use a bending machine to bend the steel plate into two types of profiled steel sheets with inner angles of 60° and 120°, and weld hexagonal ribs on the inner wall of the profiled steel sheet as a reinforcing core layer;

[0017] 2) Connect the profiled steel sheets to form hollow positive Poisson's ratio structural cells and negative Poisson's ratio structural cells; the positive Poisson's ratio structural cells and negative Poisson's ratio structural cells are arranged alternately and connected to form a honeycomb grid cell structure;

[0018] 3) Place the honeycomb grid cell structure on the base plate and fix it, then support it with an inclined bracket;

[0019] 4) After pouring the first and second self-compacting self-stressing concrete into all the honeycomb tubes in sequence using rigid tubes wrapped with energized electromagnetic coils, place a top clamping plate on the upper part of the honeycomb grid tube cell structure.

[0020] 5) After the self-compacting self-stressing concrete has fully hardened and formed self-stress, the top and bottom plates are removed to prepare the formed honeycomb grid self-stressing concrete structure.

[0021] The beneficial effects of this invention compared to the prior art are as follows:

[0022] 1. This invention features a honeycomb grid-type self-compacting self-stressing structure. During concrete hardening, micro-expansion causes tension in the thin-walled honeycomb grid, generating pre-tension stress within the thin-walled metal material. The addition of corundum balls to some of the concrete further enhances this pre-tension. After hardening, this pre-stress forms a continuous compression on the core self-compacting self-stress. When penetrated by a projectile, the pre-stress facilitates frictional resistance along the projectile wall and suppresses the cavity expansion effect, dispersing and transferring the projectile's kinetic energy from its periphery to a larger area within the structure, thus rapidly consuming the projectile's energy.

[0023] 2. When the projectile impacts the slope of the projectile-facing surface designed in this invention, the honeycomb grid structure will guide the projectile to a node position with better penetration resistance, which can play a role in guiding the projectile to deflect. The projectile-facing surface is a negative Poisson's ratio hexagonal structure filled with self-compacting concrete, which can change the penetration direction of the projectile. When the node of the projectile-facing surface is impacted by the projectile, it can dissipate the projectile's energy significantly. After the node is damaged by penetration, the projectile will continue to be guided along the honeycomb structure slope to the next node, which can achieve the purpose of continuously guiding the projectile to deflect.

[0024] 3. The concrete used in this invention is self-compacting self-stressing concrete of different strengths, which can better change the penetration angle and penetration path of the projectile at the interface.

[0025] 4. In this invention, the steel fibers in the poured concrete can form oriented steel fibers under the action of an energized coil, which can maximize the tensile strength of the steel fibers and enhance the impact and bending resistance of the components.

[0026] 5. The negative Poisson's ratio hexagonal structure in this invention will generate radial and circumferential stresses when subjected to the impact of the projectile, further enhancing the compaction pressure of the filling concrete and increasing the friction between the concrete and the projectile.

[0027] 6. The large number of periodic cells in this invention force the warhead to repeatedly create craters in multiple complete cells along the penetration path, reducing the penetration stability of the warhead.

[0028] 7. In this invention, the corundum ball can further enhance the density of self-compacting concrete, generate greater pre-tightening force, increase the friction between the projectile and the filling concrete, and enhance the anti-penetration effect.

[0029] 8. The honeycomb wall effectively confines cracks within the honeycomb cell range, preventing the rapid propagation of radial cracks and improving the overall penetration resistance of the structure.

[0030] 9. During the process of the projectile eroding the concrete, the tough honeycomb wall components in the non-contact area near the projectile undergo entanglement tearing or misalignment deformation to consume the projectile's kinetic energy and compensate for the brittle characteristics of the concrete.

[0031] 10. This invention confines the concrete cracked by the reflected tensile wave of the back elastic surface within the honeycomb wall, giving the structure both penetration resistance and fracture resistance.

[0032] 11. After being arranged periodically in a longitudinal pattern, this invention can be used as a protective structure on its own, or as a bulletproof layer and anchored to the main concrete structure through positioning anchors. It can be applied to the surface of the reinforced concrete main structure of existing ground works, which is conducive to the rapid repair of damaged buildings in engineering environments. It is a protective structure that can be used in engineering practice and has low cost and simple process. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a ribbed honeycomb grid array structure filled with concrete;

[0034] Figure 2 This is a schematic diagram of the profiled steel sheet formed after bending the steel sheet at the specified angle in the embodiment.

[0035] Figure 3 This is a schematic diagram of the hollow honeycomb grid structure of the steel plate after welding in the embodiment;

[0036] Figure 4 This is a schematic diagram of the honeycomb grid array structure with hexagonal ribs added in the embodiment;

[0037] Figure 5 This is a schematic diagram of the ribbed honeycomb grid array structure after being filled with self-compacting concrete;

[0038] Figure 6 It is a cross-sectional view of a concrete structure with missile yaw function;

[0039] Figure 7 This is a top view of the top plate;

[0040] Figure 8 This is a side view of the connection between the top and bottom clamping plates;

[0041] In the figure, 1 is the electromagnetic coil rigid tube, 2 is the inclined support, 4 is the profiled steel plate, 51 is the positive Poisson's ratio structural cell, 52 is the negative Poisson's ratio structural cell, 6 is the hexagonal rib plate, 7 is the ribbed honeycomb grid array structure, 8 is the structural impact-resistant surface, 9 is the first self-compacting self-stressing concrete, 10 is the corundum ball, 11 is the second self-compacting self-stressing concrete, 12 is the top clamping plate, 13 is the tie rod bolt, 14 is the tie rod, and 15 is the bottom clamping plate. Detailed Implementation

[0042] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0043] Example 1

[0044] See Figure 1-8 This embodiment proposes a concrete structure with projectile yaw function, comprising alternating positive Poisson's ratio structural cells 51 and negative Poisson's ratio structural cells 52, which form a honeycomb grid cell structure. Both the positive and negative Poisson's ratio structural cells 51 and 52 are made of low-carbon steel profiled sheet.

[0045] Both the positive Poisson's ratio structural cell 51 and the negative Poisson's ratio structural cell 52 are hexagonal structures; the inner walls of both the positive Poisson's ratio structural cell 51 and the negative Poisson's ratio structural cell 52 are provided with fitted hexagonal ribs 6.

[0046] The positive Poisson's ratio structural cell 51 is filled with a first self-compacting self-stressing concrete 9, and the negative Poisson's ratio structural cell 52 is filled with a second self-compacting self-stressing concrete 11. The compressive strength of the first self-compacting self-stressing concrete 9 is 100 MPa, and the compressive strength of the second self-compacting self-stressing concrete 11 is 150 MPa.

[0047] The first self-compacting self-stressing concrete 9 and the second self-compacting self-stressing concrete 11 are both made of short steel fibers, fine-grained coarse aggregate, quartz sand, PO52.5 cement, silica fume, and high-efficiency water-reducing agent, and are both filled with corundum balls 10.

[0048] The fabrication process of a concrete structure with projectile yaw function is as follows:

[0049] It includes a bottom clamping plate 15, a tie rod 14, a tie rod bolt 13, a top clamping plate 12, a second self-compacting self-stressing concrete 11, a first self-compacting self-stressing concrete 9, a ribbed honeycomb grid array structure 7, a hexagonal rib plate 6, and a profiled steel sheet 4.

[0050] See Figures 1 to 8First, a 500×100×2mm steel plate is bent at angles of 60° and 120° using a bending machine, resulting in a cell side length of 40mm, forming a profiled steel plate 4. Hexagonal ribs 6 with a thickness of 2mm are welded to the inner wall of the profiled steel plate 4. Two profiled steel plates 4 at 60° angles are welded together to form a negative Poisson's ratio structural cell 52; two profiled steel plates 4 at 120° angles are welded together to form a positive Poisson's ratio structural cell 51. The positive Poisson's ratio structural cells 51 and negative Poisson's ratio structural cells 52 are alternately welded to form a ribbed honeycomb grid array structure 7, creating a unified structure. The ribbed honeycomb grid array structure 7 is arranged 5 times horizontally and 3 times vertically, forming a "sandwich" structure.

[0051] Then, the ribbed honeycomb grid array structure 7 is fixed to the bottom clamping plate 15 using an epoxy resin adhesive. A rigid tube 1 with an energized electromagnetic coil is used for pouring: self-compacting self-stressing concrete with a strength grade of approximately 100 MPa and corundum spheres 10 is filled into the positive Poisson's ratio structural cell 51; self-compacting self-stressing concrete with a strength grade of approximately 150 MPa and corundum spheres is filled into the negative Poisson's ratio structural cell 52, forming a first self-compacting self-stressing concrete 9 and a second self-compacting self-stressing concrete 11 with directional steel fibers. This self-compacting concrete is prepared using short steel fibers, fine-grained coarse aggregate, quartz sand, PO52.5 cement, silica fume, high-efficiency water-reducing agent, and (corundum spheres), and is cured for 3-5 days. The top clamping plate 12 is then fixed to the top of the structure using an adhesive, and the top clamping plate is connected to the bottom clamping plate using tie rods 14 and tie rod bolts 13. After the concrete has fully hardened, the top and bottom plates are removed, and the honeycomb grid structure is formed. It is then anchored to the 500×100×100mm concrete main body using positioning anchors. During pouring, inclined supports 2 are used to support the ribbed honeycomb grid array structure 7 at an angle to facilitate pouring. The thickness of the top plate 12 and bottom plate 15 should be at least 20 times the thickness of the honeycomb wall.

[0052] During the hardening process, the first self-compacting self-stressing concrete 9 and the second self-compacting self-stressing concrete 11 undergo micro-expansion, which causes the honeycomb grid to be tensioned and generates pre-tension stress inside the thin-walled metal material. This pre-stress will form a continuous compression on the core concrete after the self-compacting self-stressing concrete has hardened. During the penetration of the honeycomb grid structure, the pre-stress helps to increase the frictional resistance of the ducts and plays a role in rapidly consuming energy.

[0053] The ribbed honeycomb grid array structure 7 effectively confines cracks generated during penetration within the honeycomb cells, preventing rapid radial crack propagation and improving the overall penetration resistance of the structure. The numerous periodic honeycomb grid array cells force the warhead to repeatedly create craters in multiple intact cells along its penetration path, thus reducing the warhead's penetration stability. The projectile-facing surface 8 in the figure represents the position where the projectile first contacts the warhead.

[0054] Example 2

[0055] See Figure 1-8 This embodiment proposes a concrete structure with projectile yaw function, which is the same as that in embodiment 1; the difference is that the steel plate used for profiled steel plate 4 is 600×100×3mm in size, the cell side length is 50mm, the ribbed honeycomb grid array structure 7 is arranged in 7 transverse arrays and 5 longitudinal arrays to form a "sandwich" structure.

[0056] Example 3

[0057] See Figure 1-8 This embodiment proposes a concrete structure with projectile yaw function, which is the same as that in embodiment 1; the difference is that the steel plate used for profiled steel plate 4 is 700×200×3mm in size, the cell side length is 50mm, and the ribbed honeycomb grid array structure 7 is arranged in 10 horizontal arrays and 7 vertical arrays to form a "sandwich" structure.

[0058] The honeycomb grid array structure of this invention is a reasonable prefabricated structure. It can be used as a blast shield layer and anchored to the main concrete structure via positioning anchors, covering the surface of existing ground fortifications, or it can be used as a standalone protective structure. This facilitates the rapid repair of damaged bunkers in battlefield environments.

[0059] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all of these should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. A concrete structure with projectile yaw function, characterized in that, The structure includes alternating positive Poisson's ratio structural cells (51) and negative Poisson's ratio structural cells (52), both of which are hexagonal structures. The positive Poisson's ratio structural cells (51) are filled with a first self-compacting self-stressing concrete (9), and the negative Poisson's ratio structural cells (52) are filled with a second self-compacting self-stressing concrete (11). The compressive strengths of the first self-compacting self-stressing concrete (9) and the second self-compacting self-stressing concrete (11) are not equal. The inner walls of both the positive Poisson's ratio structural cells (51) and the negative Poisson's ratio structural cells (52) are provided with fitted hexagonal ribs (6). The alternating positive Poisson's ratio structural cells (51) and negative Poisson's ratio structural cells (52) form a honeycomb grid cell structure. The upper and lower surfaces of the honeycomb grid cell structure are provided with clamps for easy construction. The compressive strength of the first self-compacting self-stressing concrete (9) is 100 MPa, and the compressive strength of the second self-compacting self-stressing concrete (11) is 150 MPa. Both the first self-compacting self-stressing concrete (9) and the second self-compacting self-stressing concrete (11) are filled with corundum spheres (10). Both the first self-compacting self-stressing concrete (9) and the second self-compacting self-stressing concrete (11) are filled with metal fibers; the first self-compacting self-stressing concrete (9) and the second self-compacting self-stressing concrete (11) are injected using a grouting pipe with an electromagnetic coil wound on the outer wall.

2. A concrete structure with projectile yaw function according to claim 1, characterized in that, The positive Poisson's ratio structural cell (51) and the negative Poisson's ratio structural cell (52) are both made of low-carbon steel profiled steel sheet.

3. The method for preparing a concrete structure with projectile yaw function as described in claim 1, characterized in that, Includes the following steps: 1) The steel plate is bent into two types of profiled steel sheets (4) with an inner angle of 60° and 120° using a bending machine. Hexagonal ribs (6) are welded on the inner wall of the profiled steel sheet (4) as a reinforcing core layer. 2) Connect the profiled steel sheets (4) to form hollow positive Poisson's ratio structural cells (51) and negative Poisson's ratio structural cells (52); the positive Poisson's ratio structural cells (51) and negative Poisson's ratio structural cells (52) are alternately connected to form a honeycomb grid cell structure; 3) Place the honeycomb grid cell structure on the base plate (15) and fix it, and then support it with the inclined bracket (2); 4) After the first self-compacting self-stressing concrete (9) and the second self-compacting self-stressing concrete (11) are sequentially poured into all the honeycomb tubes using a rigid tube (1) wrapped with an energized electromagnetic coil, a top clamp (12) is placed on the upper part of the honeycomb grid tube cell structure. 5) After the self-compacting self-stressing concrete has fully hardened and formed self-stress, the top and bottom plates are removed to prepare the formed honeycomb grid self-stressing concrete structure.

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