Concrete civil air defense door with gas bag and reinforced by three-dimensional continuous fibers

Abstract

The application discloses a concrete civil air defense door containing an air bag and being reinforced by three-dimensional continuous fibers, which comprises a door frame and a three-dimensional continuous fiber reinforced ultra-high performance concrete civil air defense door leaf, and the three-dimensional continuous fiber reinforced ultra-high performance concrete civil air defense door leaf is a five-layer composite structure, and from outside to inside, the five-layer composite structure comprises an outer three-dimensional continuous fiber reinforced ultra-high performance concrete layer, an outer steel reinforcement framework reinforced ultra-high performance concrete layer, a short fiber ultra-high performance concrete layer filled with a rubber air bag, an inner steel reinforcement framework reinforced ultra-high performance concrete layer and an inner three-dimensional continuous fiber reinforced ultra-high performance concrete layer. The concrete civil air defense door containing an air bag and being reinforced by three-dimensional continuous fibers is used for buffering and converting explosion load through the air bag, and a rigid-flexible cooperative anti-explosion system is formed in cooperation with a steel mesh grid; the fiber reinforced concrete is lightened and the anti-explosion performance is improved; and the fiber mesh is connected with the door frame to ensure that the door leaf is airtight and stable under a shock wave.

Description

Technical Field

[0001] This invention relates to the field of civil defense engineering protective equipment technology, specifically a concrete civil defense door containing an airbag and toughened by three-dimensional continuous fibers. Background Technology

[0002] Civil defense doors are special doors for entry and exit in civil defense projects. They are the guarantee of the life safety of personnel in civil defense projects during wartime. Generally, in addition to meeting the basic requirements of daily passage, civil defense doors also need to meet the requirements of fire prevention, smoke prevention, and waterproofing. In addition, resistance to blast impact is also an important requirement for civil defense doors. A concrete civil defense door containing an airbag and toughened by three-dimensional continuous fibers is a composite concept that integrates the technical features of continuous fiber toughening, airbag sealing and concrete. Currently, many air-raid shelter doors are constructed with reinforced concrete or steel. When an blast shockwave directly impacts the outer surface of the door, the reinforced concrete door bears the pressure through its concrete matrix and the internal steel reinforcement frame withstands the tensile force; both work together to bear the impact load. The steel door, on the other hand, relies on its steel panel and internal reinforcing ribs to form a rigid load-bearing shell. The door transfers the impact load to the door frame, which then distributes the load to the walls of the air-raid shelter. The load transfer is completed thanks to the rigidity of the wall. When the door is closed and pressed tightly, the door and frame compress the sealing strip, creating a sealed interface that prevents shockwaves and toxic fumes from entering the interior of the shelter, thus achieving the protective and airtight function of the air-raid shelter door. The explosive impact load acts directly on the door body without any buffer energy absorption structure. The impact energy cannot be dissipated in advance. Improving the protective resistance mainly relies on increasing the thickness of the door, increasing the density of the steel bars, or thickening the steel plate, resulting in an excessive weight of the door. This makes it inconvenient to install and open and close the door. Under the action of a strong explosive shock wave, concrete door panels are prone to cracking, and steel door panels are prone to plastic deformation, affecting the protective and airtight performance of the air-raid shelter door. Therefore, we propose a concrete air-raid shelter door with an internal airbag and toughened by three-dimensional continuous fibers. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a concrete air-raid shelter door containing airbags and toughened by three-dimensional continuous fibers. When the concrete air-raid shelter door containing airbags and toughened by three-dimensional continuous fibers is used, the airbags buffer and convert the explosive load, and together with the steel mesh, a rigid-flexible blast-resistant system is formed. The fiber-toughened concrete reduces weight and improves blast resistance. The fiber mesh is connected to the door frame to ensure the door leaf is sealed and stable under shock waves, which can effectively solve the problems in the background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a concrete air-raid shelter door containing an airbag and toughened by three-dimensional continuous fibers, comprising a door frame and a door leaf made of three-dimensional continuous fiber toughened ultra-high performance concrete. The door leaf has a five-layer composite structure, consisting of, from the outside to the inside, an outer three-dimensional continuous fiber toughened ultra-high performance concrete layer, an outer steel reinforcement ultra-high performance concrete layer, a short fiber ultra-high performance concrete layer filled with a rubber airbag, an inner steel reinforcement ultra-high performance concrete layer, and an inner three-dimensional continuous fiber toughened ultra-high performance concrete layer. The interior of the steel reinforcement ultra-high performance concrete layer is provided with steel bars and steel mesh. The rubber airbag... The interior of the short-fiber ultra-high performance concrete layer is equipped with uniformly distributed airbag groups, with connecting channels between the airbag groups. Spare airbags are located on both sides of the short-fiber ultra-high performance concrete layer filled with rubber airbags. A spring-loaded pressure safety valve is installed between the spare airbags and the airbag groups. The edge of the three-dimensional continuous fiber-reinforced ultra-high performance concrete air-raid shelter door has a door leaf sealing groove, and the edge of the door frame has a door frame flange. When the airbag-containing concrete air-raid shelter door is used, the explosive load is buffered and converted through the airbags. Combined with the steel mesh, a rigid-flexible blast-resistant system is formed. The fiber-reinforced concrete reduces weight and improves blast resistance. The fiber mesh is connected to the door frame to ensure the door leaf is sealed and stable under shock waves.

[0005] Furthermore, the airbag assembly includes a rubber airbag, an inflated rubber airbag, and an inflatable rubber airbag. The airbag assembly is located inside the short fiber ultra-high performance concrete layer filled with rubber airbags. The airbag assembly has an airbag inflation port to facilitate inflation of the airbags.

[0006] Furthermore, the backup airbags include uninflated rubber airbags and non-inflatable rubber airbags. The backup airbags are respectively located on both sides inside the short fiber ultra-high performance concrete layer filled with rubber airbags to prevent the main airbag from being damaged by impact overload.

[0007] Furthermore, it also includes a three-dimensional continuous fiber mesh, which includes three-dimensional continuous fiber mesh sheets. The inner and outer sides of the three-dimensional continuous fiber toughened ultra-high performance concrete air-raid shelter door leaf are respectively provided with two continuous fiber fixing shafts. The three-dimensional continuous fiber mesh is respectively wrapped around the outside of the continuous fiber fixing shafts. The inner and outer sides of the three-dimensional continuous fiber toughened ultra-high performance concrete air-raid shelter door leaf are respectively provided with three-dimensional continuous fiber mesh sheets, which improves the tensile and impact resistance of both sides of the door leaf.

[0008] Furthermore, the steel mesh is provided in multiple pieces, and the multiple pieces of steel mesh are arranged in parallel to each other to improve the overall structural rigidity of the door leaf.

[0009] Furthermore, the rubber airbag, the inflated rubber airbag, and the inflatable rubber airbag are filled with nitrogen gas to improve the reliability of the airbag operation.

[0010] Furthermore, the door leaf sealing groove is equipped with a sealing strip, and the door leaf sealing groove is fitted with the door frame flange to improve the airtightness of the air-raid shelter door.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: This concrete air-filled door, reinforced with three-dimensional continuous fibers, has the following advantages: The blast shock wave acts on the outer side of the three-dimensional continuous fiber-reinforced ultra-high performance concrete (UHVDC) air-raid shelter door. The double-layer three-dimensional continuous fiber mesh and three-dimensional continuous fiber sheets wrapped around the pre-embedded continuous fiber fixing shaft of the door frame can withstand tensile forces after the three-dimensional continuous fiber-reinforced UHVDC layer cracks. Energy is dissipated by the breaking of the steel wires, inhibiting crack propagation and improving the door's impact and crack resistance. The impact load is transferred to the steel reinforcement-reinforced UHVDC layer. The parallel steel mesh with the main reinforcing bars facing outwards disperses stress, preventing the door from cracking under bending. The airbag assembly aligns with the hollowed-out areas of the steel mesh, fully compressing and deforming it. The short-fiber UHVDC layer filled with rubber airbags... The airbag assembly relies on the connecting channels to balance the pressure. It absorbs the impact through nitrogen compression and rubber airbag deformation, transforming localized concentrated loads into uniform surface loads. When the pressure exceeds the set threshold, the spring-loaded pressure safety valve opens, allowing high-pressure gas to flow into the uninflated rubber airbag, achieving secondary depressurization. After the pressure decreases, the valve closes to protect the main airbag. It is adaptable to different explosion impact intensities. The sealing strip in the sealing groove at the door leaf is pressed tightly against the flange at the door frame. The explosion load is buffered and converted through the airbag. Combined with the steel mesh, it forms a rigid-flexible anti-explosion system. Fiber-reinforced toughened concrete reduces weight and improves explosion resistance. The fiber mesh is connected to the door frame to ensure the door leaf is sealed and stable under shock waves. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the middle cross-sectional structure of the door leaf structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional continuous fiber mesh structure of the present invention; Figure 3 This is a schematic diagram of the overall structure of each layer of the door leaf structure of the present invention; Figure 4 This is a three-dimensional structural diagram of each layer of the door panel structure of the present invention; Figure 5 This is a schematic diagram of the arrangement structure of the three-dimensional continuous fiber mesh of the present invention in a door leaf; Figure 6 This is a schematic diagram of the arrangement of the steel reinforcement frame in the door leaf according to the present invention; Figure 7 This is a schematic diagram of the arrangement of the outer three-dimensional continuous fibers in the door leaf according to the present invention; Figure 8 This is a schematic diagram of the arrangement of the inner three-dimensional continuous fibers in the door leaf according to the present invention; Figure 9 This is a schematic diagram showing the arrangement of the rubber airbags in the door leaf according to the present invention; Figure 10 This is a schematic diagram showing the corresponding positions of the rubber airbag and the steel mesh in this invention. Figure 11 This is a three-dimensional structural diagram of the inventor's security door in the open state; Figure 12 The waveform data measured by the sensor and the deformation diagram of the protective equipment under the action of explosive load are shown. Figure 13 Comparison of impact damage between conventional chopped fiber UHPC and continuous fiber toughened UHPC; (a) chopped fiber UHPC, (b) continuous fiber toughened UHPC.

[0013] In the diagram: 1. Three-dimensional continuous fiber toughened ultra-high performance concrete layer; 2. Reinforcing steel; 3. Rubber airbag; 4. Reinforcing steel skeleton reinforced ultra-high performance concrete layer; 5. Short fiber ultra-high performance concrete layer filled with rubber airbag; 6. Three-dimensional continuous fiber mesh; 7. Reinforcing steel mesh; 8. Inflated rubber airbag; 9. Uninflated rubber airbag; 10. Spring-loaded pressure safety valve; 11. Airbag inflation port; 12. Door frame; 13. Continuous fiber fixing shaft; 14. Inflatable rubber airbag; 15. Uninflatable rubber airbag; 16. Three-dimensional continuous fiber toughened ultra-high performance concrete air-raid shelter door leaf; 17. Sealing groove at the door leaf; 18. Flange at the door frame; 19. Three-dimensional continuous fiber mesh. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention. Example 1

[0015] Please see Figure 1-11This embodiment provides a technical solution: a concrete air-raid shelter door containing an airbag and toughened with three-dimensional continuous fibers, including a door frame 12 and a door leaf 16 made of three-dimensional continuous fiber toughened ultra-high performance concrete. The door leaf 16 has a five-layer composite structure, consisting of, from the outside to the inside, an outer three-dimensional continuous fiber toughened ultra-high performance concrete layer 1, an outer steel reinforcement skeleton-reinforced ultra-high performance concrete layer 4, a short fiber ultra-high performance concrete layer 5 filled with rubber airbags, an inner steel reinforcement skeleton-reinforced ultra-high performance concrete layer 4, and an inner three-dimensional continuous fiber toughened ultra-high performance concrete layer 5. The interior of the concrete layer 1 and the steel reinforcement ultra-high performance concrete layer 4 are respectively equipped with steel bars 2 and steel mesh 7. The interior of the rubber airbag filled short fiber ultra-high performance concrete layer 5 is equipped with uniformly distributed airbag groups, and there are connecting channels between the airbag groups. The matrix of the rubber airbag filled short fiber ultra-high performance concrete layer 5 is mixed with carbon fiber, steel fiber and polypropylene short fiber to make up for the inherent brittleness of ultra-high performance concrete and improve the crack resistance of the intermediate layer itself. The ultra-high performance concrete does not contain coarse aggregate. Combined with the self-leveling pouring process, it reduces the air bubble defects at the interface of each layer and further ensures the integrity of the door leaf. See Figure 2 and Figure 4 The short-fiber ultra-high performance concrete layer 5 filled with rubber airbags has spare airbags on both sides. A spring-loaded pressure safety valve 10 is provided between the spare airbags and the airbag assembly. (See reference) Figure 11 The edge of the three-dimensional continuous fiber-reinforced ultra-high performance concrete air-raid shelter door leaf 16 is provided with a door leaf sealing groove 17, and the edge of the door frame 12 is provided with a door frame flange 18. (See reference) Figure 4 and Figure 9 The airbag assembly includes a rubber airbag 3, an inflated rubber airbag 8, and an inflatable rubber airbag 14. The airbag assembly is located inside a short-fiber ultra-high performance concrete layer 5 filled with rubber airbags. The airbag assembly has an inflation port 11. The spare airbags include an uninflated rubber airbag 9 and a non-inflatable rubber airbag 15. The spare airbags are located on both sides inside the short-fiber ultra-high performance concrete layer 5 filled with rubber airbags. (See reference...) Figures 5-8 It also includes a three-dimensional continuous fiber mesh 6, which comprises three-dimensional continuous fiber mesh sheets 19. Two continuous fiber fixing shafts 13 are respectively provided on the inner and outer sides of the three-dimensional continuous fiber toughened ultra-high performance concrete air-raid shelter door leaf 16. The three-dimensional continuous fiber mesh 6 is respectively wound around the outside of the continuous fiber fixing shafts 13. Three-dimensional continuous fiber mesh sheets 19 are respectively provided on the inner and outer sides of the three-dimensional continuous fiber toughened ultra-high performance concrete air-raid shelter door leaf 16. (See reference...) Figure 6 The steel mesh 7 is provided in multiple pieces, and the multiple steel mesh 7 are arranged in parallel to each other. The rubber airbag 3, the inflated rubber airbag 8 and the inflatable rubber airbag 14 are filled with nitrogen. The door leaf sealing groove 17 is provided with a sealing strip. The door leaf sealing groove 17 and the door frame flange 18 are fitted together. Example 2

[0016] The working principle of the concrete air-filled and three-dimensionally continuous fiber-reinforced air-raid shelter door provided by this invention is as follows: When the concrete air-filled and three-dimensionally continuous fiber-reinforced air-raid shelter door is used, the three-dimensional continuous fiber mesh 6 and three-dimensional continuous fiber mesh 19 on the inner and outer sides of the door leaf 16 are wrapped and fixed on the continuous fiber fixing shaft 13 pre-embedded in the door frame 12 to form a double-layer mesh. When the explosive shock wave acts on the outer side of the door leaf 16 of the three-dimensionally continuous fiber-reinforced ultra-high performance concrete air-raid shelter door, the three-dimensional continuous fiber-reinforced ultra-high performance concrete layer 1 bears the shock wave. Under impact loads, once the concrete matrix cracks, the tightly wound three-dimensional continuous fiber mesh 19 absorbs the tensile force. The failure mode of the component changes from the pull-out failure of ordinary short fibers to the breakage of high-strength steel wires, absorbing impact energy, inhibiting further crack propagation, and improving the overall impact resistance and crack resistance of the door leaf. The two-layer steel reinforcement skeleton reinforces the multiple parallel steel meshes 7 inside the ultra-high performance concrete layer 4 as a rigid force transmission skeleton. The main load-bearing bars of the steel mesh 7 are arranged on the outside and the distribution bars are arranged on the inside. After the impact load passes through the outer layer, it is transferred to the steel reinforcement skeleton layer. The parallel steel mesh 7. Uniformly disperses impact stress, reduces local stress concentration, ensures coordinated stress distribution between layers, and prevents the door leaf 16 of the three-dimensional continuous fiber-reinforced ultra-high performance concrete air-raid shelter from bending cracking. Simultaneously, the airbag assembly's placement corresponds one-to-one with the hollowed-out areas of the reinforcing mesh 7, allowing the airbags to undergo full compression deformation at the hollowed-out locations. Connecting channels are set between the airbags within the short-fiber ultra-high performance concrete layer 5 filled with rubber airbags. The airbags are filled with chemically stable nitrogen gas. Under the impact of an explosion, the airbag assembly first undergoes compression deformation, relying on nitrogen compression and the rubber airbags 3... The deformation of the main body dissipates the kinetic energy of the explosion impact, and the connecting channel enables the pressure between each airbag to be interconnected, transforming the locally concentrated explosion impact load into a uniform surface load that is transmitted backward. When the impact pressure exceeds the preset opening threshold of the spring-type pressure safety valve 10, the valve opens, and the high-pressure gas inside the airbag group flows into the spare airbags 9 (uninflated) and 15 (not inflatable) arranged in the sealed hollow boxes on both sides, completing the secondary pressure relief and buffering. After the impact disappears, the pressure drops, and the spring-type pressure safety valve 10 closes, thereby preventing the main airbag from overload and rupture. It can be adapted to explosion impacts of different strength levels. The airbag inflation port 11 is used to fill the airbag assembly with nitrogen during the early assembly stage. When the door leaf 16 of the three-dimensional continuous fiber toughened ultra-high performance concrete air-raid shelter door is closed, the sealing strip inside the sealing groove 17 at the door leaf and the flange 18 at the door frame press against each other to achieve a tight fit between the door leaf 16 and the door frame 12, ensuring the airtightness, smoke prevention and waterproof protection requirements of the door leaf 16 when it is closed. Example 3

[0017] A resistance performance test was conducted on a concrete air-cushioned civil defense door reinforced with three-dimensional continuous fibers according to the present invention to test whether the submitted sample met the explosion resistance requirements of Level 5 civil defense resistance. According to the specifications, the evaluation criteria for the qualified protective sample under the design resistance load are: (1) the protective sample as a whole can work normally (normal opening and closing operation); (2) the protective sample, components and key mechanisms do not show obvious irreversible deformation; (3) the product, components and key mechanisms do not show macroscopic cracks. The submitted sample is qualified only if it meets the above three conditions at the same time; otherwise, it is considered unqualified.

[0018] Detection conditions and principles: The resistance performance testing of protective equipment was conducted in a high-resistance sealed blast crater, using a chemical explosion loading test. By uniformly distributing detonating cords within the crater, the shock wave and high-pressure gas generated by the detonation of the cords filled the confined space, creating a relatively uniform simulated nuclear explosion pressure load. This load was then applied to the protective equipment under test, simulating the corresponding resistance load. Four pressure sensors were evenly distributed to record the pressure load signal generated by the detonating cord explosion. The signal was amplified via wires, sampled by a data acquisition instrument, and transmitted to a computer for processing and analysis by supporting software. The test parameter was the reflected pressure acting on the protective door, and the peak load, positive pressure duration, and peak rise time were recorded.

[0019] Test results like Figure 12 As shown, the concrete air-filled door of the present invention, which is toughened by three-dimensional continuous fibers and contains an airbag, can be opened and closed normally under the load of the design resistance level (pressure peak 0.3MPa). The sample did not show obvious irreversible deformation, and the protective device meets the requirements of the fifth level air defense resistance standard. Example 4

[0020] Comparison of conventional reinforced concrete airtight doors (1560 kg) vs. the air-filled, three-dimensionally continuous fiber-reinforced concrete air-raid shelter door of this invention (continuous fiber-reinforced ultra-high performance concrete (UHPC) + connected airbag, 1207 kg). Comparative analysis shows that after adding the three-dimensional continuous fiber-reinforced UHPC surface layer, the peak displacement at the center of the air-raid shelter door is reduced by 20.1% compared to the traditional structure, significantly improving structural stiffness; the maximum principal compressive stress of the concrete is reduced by 16.8%, significantly alleviating local stress concentration; the steel reinforcement stress is reduced from 335.0 MPa to 264.6 MPa, significantly improving the overall structural stress uniformity and safety reserve. Furthermore, the airbag can absorb and dissipate impact energy through compression deformation under explosive impact. The addition of the airbag also reduces the amount of concrete used and lowers the self-weight, making transportation and installation more convenient.

[0021] A continuous fiber-reinforced UHPC layer and two layers of steel mesh reinforcement form a gradient impedance match, achieving gradual attenuation of shock waves at the interlayer interface. The three-dimensional woven continuous fibers form a spatial network structure within the concrete matrix, enabling all-around reinforcement and toughening. Comparative results show that the continuous fiber-reinforced material can more effectively maintain structural integrity under shock wave action, with a much lower degree of fragmentation than traditional materials. This invention, through its three-dimensional continuous fiber network structure, overcomes the limitation of traditional steel reinforcement that only strengthens in the planar direction, achieving multi-directional stress dispersion under explosive impact loads.

[0022] Furthermore, this embodiment also conducted comparative tests on conventional short-cut fiber ultra-high performance concrete and the continuous fiber-reinforced ultra-high performance concrete used in this invention under higher explosive impact loads. The tests were conducted using a Hopkinson bar loading device, and the damage results of the two types of samples under a 0.5 MPa impact load are as follows: Figure 13 As shown, it can be observed that when the impact load is further increased, conventional chopped fiber UHPC will be pulled out due to the limited anchorage length of the fibers, making it prone to penetrating cracks or even complete fragmentation under explosive impact. In contrast, continuous fiber toughened UHPC, due to the longer anchorage length of the fiber network skeleton and better overall integrity, does not exhibit pulverizing damage to the concrete, resulting in superior protective performance. Therefore, this invention, through the bridging and crack-resistant effects of three-dimensional continuous fibers, can significantly reduce the level of concrete damage caused by explosive impact, ensuring that the air-raid shelter door can maintain its basic protective function under extreme loads.

[0023] In summary, this invention, through its composite structural design of three-dimensional continuous fiber-reinforced ultra-high performance concrete and rubber airbag filling layer, significantly outperforms existing reinforced concrete protective airtight doors in terms of compressive strength, impact toughness, energy dissipation capacity, and damage control, providing a novel protective door solution with high resistance and high toughness for civil defense projects.

[0024] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A concrete air-raid shelter door containing an airbag and toughened with three-dimensional continuous fibers, characterized in that: The door includes a door frame (12) and a three-dimensional continuous fiber-reinforced ultra-high performance concrete door leaf (16). The door leaf (16) is a five-layer composite structure, consisting of an outer three-dimensional continuous fiber-reinforced ultra-high performance concrete layer (1), an outer steel skeleton reinforced ultra-high performance concrete layer (4), a rubber airbag filled short fiber ultra-high performance concrete layer (5), an inner steel skeleton reinforced ultra-high performance concrete layer (4), an inner three-dimensional continuous fiber-reinforced ultra-high performance concrete layer (1), and an inner steel skeleton reinforced ultra-high performance concrete layer (4). The short fiber ultra-high performance concrete layer (5) filled with rubber airbags is provided with uniformly distributed airbag groups inside, and there are connecting channels between the airbag groups. Spare airbags are provided on both sides of the short fiber ultra-high performance concrete layer (5) filled with rubber airbags. A spring-type pressure safety valve (10) is provided between the spare airbags and the airbag groups. A door leaf sealing groove (17) is provided at the edge of the three-dimensional continuous fiber toughened ultra-high performance concrete door leaf (16), and a door frame flange (18) is provided at the edge of the door frame (12).

2. The concrete air-raid shelter door containing an airbag and toughened with three-dimensional continuous fibers according to claim 1, characterized in that: The airbag assembly includes a rubber airbag (3), an inflated rubber airbag (8), and an inflatable rubber airbag (14). The airbag assembly is located inside a short fiber ultra-high performance concrete layer (5) filled with rubber airbags, and an airbag inflation port (11) is provided on the airbag assembly.

3. A concrete air-raid shelter door containing an airbag and toughened with three-dimensional continuous fibers according to claim 1, characterized in that: The backup airbags include an uninflated rubber airbag (9) and a non-inflatable rubber airbag (15), which are respectively located on both sides inside the short fiber ultra-high performance concrete layer (5) filled with rubber airbags.

4. A concrete air-raid shelter door containing an airbag and toughened with three-dimensional continuous fibers according to claim 1, characterized in that: It also includes a three-dimensional continuous fiber mesh (6), which includes a three-dimensional continuous fiber mesh sheet (19). The inner and outer sides of the three-dimensional continuous fiber toughened ultra-high performance concrete air defense door leaf (16) are respectively provided with two continuous fiber fixing shafts (13). The three-dimensional continuous fiber mesh (6) is respectively wrapped around the outside of the continuous fiber fixing shafts (13). The inner and outer sides of the three-dimensional continuous fiber toughened ultra-high performance concrete air defense door leaf (16) are respectively provided with three-dimensional continuous fiber mesh sheets (19).

5. A concrete air-raid shelter door containing an airbag and toughened with three-dimensional continuous fibers according to claim 1, characterized in that: The steel mesh (7) is provided in multiple pieces, and the multiple steel meshes (7) are arranged in parallel to each other.

6. A concrete air-raid shelter door containing an airbag and toughened with three-dimensional continuous fibers according to claim 2, characterized in that: The rubber airbag (3), the inflated rubber airbag (8), and the inflatable rubber airbag (14) are filled with nitrogen.

7. A concrete air-raid shelter door containing an airbag and toughened with three-dimensional continuous fibers according to claim 1, characterized in that: The door leaf sealing groove (17) is provided with a sealing strip, and the door leaf sealing groove (17) and the door frame flange (18) are fitted together.

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