An assembled protective shelter

Abstract

The present invention discloses a prefabricated protective shelter, including a protective shelter buried in the soil bottom. The protective shelter includes a shelter structure, end structures, and an access passage structure. The access passage structure is arranged on one side of the shelter structure, and the end structures are distributed on both sides of the shelter structure. The shelter structure is composed of a number of single arches and standard interfaces. The single arch includes a number of unit plates and arch feet, and the arch feet are installed below the number of unit plates. The unit plate includes a connecting plate, and the connecting plate is provided with a three-dimensional corrugated steel plate. Lifting lugs are suspended on the unit plate, and the lifting lugs are used for lifting equipment, assisting in lifting, disassembling, and installing products. The shelter structure of the present invention is buried deeper in the soil bottom and has higher resistance; in addition, in the present invention, a floor arch is directly formed by splicing between single arches, and the overall stability is relatively good; in addition, the protective shelter of the present invention has a larger space, improving the use comfort level.

Description

Technical Field

[0001] The present invention relates to the technical field of shelters, and in particular to a prefabricated protective shelter. Background Art

[0002] Shelters are mainly used to quickly build emergency protective works in airports, ground-to-air missile positions and similar places, meet the protection requirements of personnel, ensure the safety of personnel during combat, and can fill the gap in the emergency protection of personnel in the air force battlefield.

[0003] 1. The space of traditional prefabricated protective shelters is small, and the comfort of personnel use is poor;

[0004] 2. Traditional prefabricated protective shelters are buried shallowly and have low resistance;

[0005] 3. Traditional prefabricated protective shelters do not have equipment interfaces such as drainage and lighting.

[0006] Therefore, there is an urgent need for a prefabricated protective shelter. Summary of the Invention

[0007] Aiming at the deficiencies existing in the prior art, the technical problem to be solved by the present invention is to provide a prefabricated protective shelter with a relatively deep burial depth, relatively high resistance, relatively good stability, slightly larger space, and having drainage, lighting, and capable of providing a relatively comfortable protective space.

[0008] To solve the above technical problems, the present invention provides a prefabricated protective shelter, including a protective shelter buried in the soil. The protective shelter includes a shelter structure, an end structure, and an access passage structure. The access passage structure is arranged on one side of the shelter structure, and the end structures are distributed on both sides of the shelter structure to form a closed space. The access passage structure is connected to the end structures. The shelter structure is composed of a number of single arches, and the single arches are directly spliced together. Each single arch includes a number of unit plates and arch feet. The arch feet are installed below the number of unit plates to form an arch body. The unit plate includes a connecting plate, and the connecting plate is provided with a three-dimensional corrugated steel plate. The three-dimensional corrugation is a two-way cosine three-dimensional corrugation, and the two-way cosine three-dimensional corrugation has a very high bending and torsional strength. The connecting plate is installed with at least two groups of rib plates to improve the stiffness and structural strength of the unit plate. After the connecting plate is ribbed, the connection and installation of the three-dimensional corrugated steel plate are the connections between the rib plates. The two groups of rib plates are welded on the four sides of the three-dimensional corrugated steel plate. Lifting lugs are suspended on the unit plate, and the lifting lugs are used for lifting equipment, assisting in lifting, disassembling, and installing products. The protective shelter of the present invention has a relatively deep soil cover and high resistance; in addition, the protective shelter of the present invention is a floor arch with relatively good overall stability; in addition, the space of the protective shelter of the present invention is slightly larger.

[0009] Preferably, the two sets of rib plates include a first rib plate and a second rib plate, the first rib plate and the second rib plate are symmetrically distributed, the first rib plate and the second rib plate are both provided with standard building interfaces, the first rib plate is provided with a horizontal oblong hole, the second rib plate is provided with a vertical oblong hole, the horizontal oblong hole and the vertical oblong hole form a cross interface, and the unit plate is installed for the bunker structure by a side-by-side combined connection method through the cross interface on the two sets of rib plates.

[0010] Preferably, the single arch includes a load-bearing base and a pedal, and the pedal is installed inside the load-bearing base.

[0011] Preferably, the arch foot includes a corrugated vertical plate and a box-shaped folding plate. The upper ends of the corrugated vertical plate and the box-shaped folding plate are connected. The box-shaped folding plate is a box-shaped structure for convenient alignment and installation with the load-bearing base of the bunker structure. The box-shaped arch foot is designed with a regular frame structure to increase the connection strength at the arch foot. The corrugated vertical plate is provided with corrugated rib edges on its sides, and the corrugated rib edges are butt-jointed and installed with the unit plate. The height of the single arch is increased through the corrugated vertical plate to expand the internal space of the bunker structure.

[0012] Preferably, the end structure includes a side corrugated plate and an airtight door. The airtight door is installed in the middle of the side corrugated plate. The side corrugated plate includes five unit corrugated plates, and the five unit corrugated plates are symmetrically arranged to bear the load force in three-dimensional directions. Each unit corrugated plate is provided with corrugated plate rib edges and lower pedestals provided below the corrugated plate rib edges. The corrugated plate rib edges are attached to the upper edges of the unit corrugated plates, and the lower pedestals are connected to the lower ends of the unit corrugated plates. The side corrugated plate is connected to the bunker structure through the corrugated plate rib edges and the lower pedestals to construct a longitudinally enclosed space.

[0013] Preferably, an inner door frame and an outer door frame are provided in the middle of the side corrugated plate. The outer door frame is connected to the access passage structure. The inner door frame is fixedly installed with an airtight door. The airtight door is fixed to the inner door frame using hinges. When the airtight door is in use, it rotates inward to open towards the inside of the bunker structure, and personnel inside the bunker structure can close and lock the airtight door.

[0014] Preferably, ventilation systems are provided at the left and right ends of the end structure. The ventilation systems are installed at the upper corners of the end structure. The ventilation systems are axial flow exhaust fans, and the axial flow exhaust fans are installed in a diagonal staggered manner to maximize the circulation ventilation inside the bunker structure.

[0015] Preferably, the access channel structure includes a first fast access and a channel. The first fast access and the channel are respectively arranged on both sides of the bunker structure. The channel is an L-shaped channel. The L-shaped channel allows personnel to enter and exit the bunker structure by climbing a climbing ladder. A load-bearing nested double-sealed door is provided at the inlet and outlet of the L-shaped channel, and the L-shaped channel is locked by a double-sealed door lock.

[0016] Preferably, the double-sealed door includes a large door and a small door. The large door and the small door are composed of inner and outer circular door bodies of different sizes. The small door is embedded in the center of the large door. Both the large door and the small door are provided with radiation-resistant reinforcing rib plates to ensure a certain steel strength when under the heavy pressure of overlying objects.

[0017] Preferably, a drainage system is provided at the bottom of the bunker structure. The drainage system includes at least two sewage pumps and drainage pipelines. The sewage pumps are connected to the drainage pipelines to discharge the accumulated water at the bottom of the bunker structure, keeping the interior of the bunker structure dry.

[0018] Preferably, a power supply and lighting system is also provided inside the bunker structure. Through functional modules such as the drainage, power supply and lighting systems, the bunker structure of the present invention is provided with measures for drainage, power supply and lighting, and the equipment is relatively complete, and can be used as a semi-permanent underground air defense bunker.

[0019] Compared with the prior art, the solution of the present invention has at least the following beneficial effects:

[0020] (1) The bunker structure of the present invention consists of several single arches, and the single arches are directly spliced together. Each single arch includes several unit plates and arch feet. The arch feet are installed below the several unit plates to form an arch body. The unit plate includes a connecting plate, and the connecting plate is provided with a three-dimensional corrugated steel plate, which has a very high bending and torsion strength. The upper overlying soil of the bunker structure of the present invention is relatively deep and the resistance strength is relatively high; in addition, the present invention forms a floor arch by directly splicing the single arches together, and the overall stability is relatively good; in addition, the space of the protective bunker of the present invention is slightly larger.

[0021] (2) The bunker structure of the present invention is provided with a drainage system at the bottom and a power supply and lighting system inside, which are not available in existing bunkers, and the equipment of the protective bunker of the present invention is relatively complete. The protective bunker of the present invention can be used for a relatively long time after being buried underground, so the protective bunker of the present invention is more suitable for use in military airports, providing a relatively comfortable underground space for military airports; it can also meet the protection requirements of personnel, ensure the safety of personnel during combat, and fill the gap in the emergency protection of personnel in the air force battlefield.

[0022] (3) The single arch of the present invention includes a load-bearing base and a pedal. The pedal is installed inside the load-bearing base, forming a closed semi-circular structural space. The load-bearing base serves as the transverse connecting bridge at the bottom of the single arch, enabling the single arch to withstand transverse tensile forces and enhancing the load-bearing capacity of the single arch. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly introduced below.

[0024] Figure 1 is the overall structure diagram of the prefabricated protective shelter of the present invention;

[0025] Figure 2 is the structural schematic diagram of the single arch of the present invention;

[0026] Figure 3 is the schematic diagram of the splicing of the unit plates of the present invention;

[0027] Figure 4 is the structural schematic diagram of the arch foot of the present invention;

[0028] Figure 5 is the structural schematic diagram of the inner door frame of the present invention;

[0029] Figure 6 is the structural schematic diagram of the outer door frame of the present invention;

[0030] Figure 7 is the schematic diagram of the disassembled structure of the access passage of the present invention;

[0031] Figure 8 is the structural schematic diagram of the two-way airtight door of the present invention;

[0032] Figure 9 is the installation schematic diagram of the horizontal quick clamp and the L-shaped bolt of the present invention.

[0033] In the figures: shelter structure 1, unit plate 11, connecting plate 111, two groups of rib plates 112, lifting lug 113, arch foot 12, corrugated vertical plate 121, box-shaped folding plate 122, corrugated rib edge 123, load-bearing base 13, pedal 14, end structure 2, side corrugated plate 21, inner door frame 211, outer door frame 212, airtight door 22, unit corrugated plate 23, corrugated plate rib edge 24, lower footrest 25, access passage structure 3, first quick access 31, L-shaped passage 32, vertical passage 321, horizontal passage 322, two-way airtight door 33, large door 331, small door 332, horizontal quick clamp 333, L-shaped bolt 334, ventilation system 4. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] As Figure 1 shown, it is about a prefabricated protective bunker, including a protective bunker buried in the ground bottom, with deep overburden and high resistance; specifically, the protective bunker includes a bunker structure 1, an end structure 2, and an access passage structure 3. The access passage structure 3 is sealed on one side of the bunker structure 1, and the end structure 2 is distributed on both sides of the bunker structure 1 to construct a closed space structure and is used to connect the access passage structure 3. Among them, the bunker structure 1 is a self-supporting protective surface of the protective bunker, meeting the protection requirements of personnel.

[0036] The bunker structure 1 of the present invention is composed of several single arches, and the single arches are connected through standard interfaces.

[0037] As Figure 2 shown, specifically, the single arch is the core component of the bunker structure 1. The bunker structure 1 is formed by connecting 8 single arches. Therefore, the protective bunker of the present invention is a floor arch with relatively good overall stability; in addition, the space of the protective bunker of the present invention is slightly larger.

[0038] Specifically, the single arches of the present invention are spliced without using bolts or flanges, which is convenient for the operation of the protective bunker and can also reduce costs. Bolts or flanges can be used at the base below the single arch; bolts or flanges can also be used to join the single arches together, and then the bases below the single arches can also be spliced, which can better ensure the quality of the protective bunker. Therefore, the single arches can be selectively connected according to different situations or operation requirements.

[0039] The single arch includes several unit plates 11 and arch feet 12, and the arch feet 12 are installed below the several unit plates 11 to form an arch body.

[0040] As Figure 3 shown, when the present invention is specifically implemented, three unit plates 11 are selected for splicing. The unit plate 11 is arc-shaped. The arch body is mainly composed of three arc-shaped unit plates 11 above and two arch feet below. The semi-circular arc of the arch body is divided into three parts, two large unit plates 11 and one small unit plate 11. The one-in-three arched assembly design optimizes the structural strength while further reducing the weight of the basic unit plate 11, facilitating the transportation and construction of the bunker structure 1.

[0041] The unit plate 11 of the present invention includes a connecting plate 111, which is provided with a three-dimensional corrugated steel plate. The connecting plate 111 is installed with at least two groups of ribs 112, so as to improve the rigidity and structural strength of the unit plate 11. After the connecting plate 111 is ribbed, the connection installation of the three-dimensional corrugated steel plate is a connection between the ribs. The two groups of ribs 112 are welded on the four sides of the three-dimensional corrugated steel plate. The thickness of the two welded groups of ribs 112 is 6 mm. Among them, the unit plate 11 is hoisted with a lifting lug 113, and the lifting lug 113 is a lifting device, auxiliary lifting, disassembly and installation product.

[0042] The two groups of ribs 112 of the present invention include a first rib and a second rib, which are symmetrically distributed with each other. The first rib and the second rib are both provided with a standard building interface. The first rib is provided with a transverse long waist-shaped hole, and the second rib is provided with a vertical long waist-shaped hole. The transverse long waist-shaped hole and the vertical long waist-shaped hole form a cross interface. The unit plate 11 is installed in the shelter structure 1 in a shoulder-to-shoulder combination connection manner through the cross interface on the two groups of ribs 112, which facilitates the assembly of the unit plates 11 to form the shelter structure 1.

[0043] The protective shelter of the present invention is relatively convenient to construct and is particularly suitable for wartime. Compared with traditional permanent preparation projects and field projects, the mobility, cost and construction difficulty of the protective shelter are between the two and are suitable for use in military airports.

[0044] The single arch further includes a load-bearing base 13 and a pedal 14 , and the pedal 14 is installed inside the load-bearing base 13 .

[0045] like Figure 4 As shown, the arch foot includes a corrugated vertical plate 121 and a box-shaped folded plate 122, the upper ends of the corrugated vertical plate 121 and the box-shaped folded plate 122 are connected, the box-shaped folded plate 122 is a box-shaped structure, which is convenient for alignment and installation with the load-bearing base 13 of the shelter structure 1, and the box-shaped arch foot adopts a regular frame-shaped structure design to increase the connection strength at the arch foot, and the side of the corrugated vertical plate 121 is provided with a corrugated rib 123, and the corrugated rib 123 and the unit plate 11 are docked and installed, and the height of the single arch is increased by the corrugated vertical plate 121 to expand the internal space of the shelter structure 1.

[0046] In the specific implementation of the present invention, the end structure 2 includes side corrugated plates 21 and a sealed door 22. The sealed door 22 is installed in the middle of the side corrugated plates 21. The side corrugated plates 21 include five unit corrugated plates 23. These five unit corrugated plates 23 have different areas and are symmetrically arranged with each other to bear the load force in three-dimensional directions. Each unit corrugated plate 23 is provided with a corrugated plate rib 24 and a lower footrest 25 provided below the corrugated plate rib 24. The corrugated plate rib 24 is attached to the edge above the unit corrugated plate 23, and the lower footrest 25 is connected to the lower end of the unit corrugated plate 23. The side corrugated plates 21 are connected to the bunker structure 1 through the corrugated plate ribs 24 and the lower footrests 25 to form a longitudinally enclosed space.

[0047] As Figure 5-6 shown, in the specific implementation of the present invention, an inner door frame 211 and an outer door frame 212 are provided in the middle of the side corrugated plates 21. The outer door frame 212 is connected to the access passage structure 3. The inner door frame 211 is fixedly installed with a sealed door 22. The sealed door 22 is fixed to the inner door frame 211 using hinges. When the sealed door 22 is in use, it rotates and opens towards the inside of the bunker structure 1. A 90° quick locking clamp is provided on the door. Personnel inside the bunker structure 1 can close and lock the sealed door 22. The inner door frame 211, the outer door frame 212 and the sealed door 22 are designed as structures with an arc at the top, so as to facilitate improving the structural strength and also facilitate personnel passage. The sealed door 22 is made of a steel structure framework with steel plates laid outside.

[0048] In the specific implementation of the present invention, a ventilation system 4 is provided at the left and right ends of the end structure 2. The ventilation system 4 mainly consists of two axial flow exhaust fans and ventilation pipelines. The two axial flow exhaust fans are respectively installed on the left and right end sealing plates. The intake and exhaust of the axial flow exhaust fans are set according to the direction of the bunker structure 1 to ensure the effective circulation of air inside the bunker structure 1. According to the internal space structure of the bunker structure 1, the ventilation system 4 provided has a ventilation frequency of: 5 to 6 times every 4 hours during normal times, and 2 to 3 times every 4 hours during emergency shelter, which can meet the environmental comfort requirements. In addition, the axial flow exhaust fans are installed in a diagonal staggered manner to maximize the circulation ventilation inside the bunker structure 1.

[0049] As Figure 8 shown, the access passage structure 3 of the present invention includes a first quick access 31 and a passage. The first quick access 31 and the passage are respectively arranged on both sides of the bunker structure 1. The passage adopts an L-shaped passage 32. The L-shaped passage 32 allows personnel to enter and exit the bunker structure 1 by climbing a climbing ladder. A load-bearing nested double-sealed door 33 is provided at the inlet and outlet of the L-shaped passage 32. The L-shaped passage 32 is locked by the double-sealed door 33.

[0050] A drainage system is provided at the bottom of the bunker structure 1. The drainage system includes at least two sewage pumps and drainage pipelines. The sewage pumps are connected to the drainage pipelines to discharge the accumulated water at the bottom of the bunker structure 1, keeping the interior of the bunker structure 1 dry.

[0051] Specifically, a power supply and lighting system is also provided inside the bunker structure 1, supporting functional modules such as the drainage system and the power supply and lighting system, which are not available in traditional bunkers. The protective bunker of the present invention is provided with drainage, power supply, and lighting measures, and the equipment is relatively complete, and can be used as a permanent underground protective bunker. The air defense bunker of the present invention is suitable for being buried underground for a long time, and is more suitable for use by military airport personnel, and can provide a relatively comfortable underground space for military airport personnel.

[0052] Example 1:

[0053] An assembled protective bunker, which includes a bunker structure 1, an end structure 2, and an access passage structure 3. The access passage structure 3 is provided on one side of the bunker structure 1, and the end structures 2 are distributed on both sides of the bunker structure 1 to form a closed space. The access passage structure 3 is connected to the end structure 2. The bunker structure 1 is composed of several single arches and standard interfaces. The single arches are connected through the standard interfaces. The single arch also includes a load-bearing base 13 and a pedal 14. The pedal 14 is installed inside the load-bearing base 13. The load-bearing base 13 is composed of two unit bases connected. The unit base is mainly formed by welding rectangular pipes into a cuboid. Waist-shaped holes are provided in the unit base, and the waist-shaped holes are evenly distributed around the unit base for quick construction and installation between the unit bases. The pedal 14 with the same area as the external shape of the unit base is set. The pedal 14 is made of aluminum alloy tread plate, which is light in weight and has good anti-slip performance. During construction, it is directly placed on each unit base, and the installation is convenient and fast.

[0054] Example 2:

[0055] An assembled protective bunker, which includes a bunker structure 1, an end structure 2, and an access passage structure 3. The access passage structure 3 is arranged on one side of the bunker structure 1, and the access passage structure 3 is connected to the end structure 2. The access passage structure 3 includes a first quick inlet / outlet 31 and a passage. The first quick inlet / outlet 31 and the passage are respectively arranged on both sides of the bunker structure 1. The passage adopts an L-shaped passage 32. The L-shaped passage 32 allows personnel to enter and exit the bunker structure 1 by climbing a climbing ladder. The L-shaped passage 32 is divided into a vertical passage 321 and a horizontal passage 322. To reduce the weight of the passage and facilitate the construction and installation of the bunker structure 1, the passage is designed as a multi-segment structure, and each segment of the vertical passage 321 is symmetrically cut open. Such a design can also adjust the height of the passage according to the landfill depth of the bunker to facilitate personnel to enter the protective bunker. In addition, a continuous climbing ladder with a spacing of 250 mm is arranged inside the vertical passage 321 to facilitate personnel to climb in and out of the bunker.

[0056] Embodiment 3:

[0057] An assembled protective bunker, whose structure is basically the same as that of Embodiment 2. For the convenience of description and to save space, only the content different from Embodiment 2 will be described below:

[0058] As Figure 8-Figure 9 shown, when there is soil covering the entrance and exit, the load-bearing nested double-sealed door 33 can easily open the door body, facilitating personnel to walk out of the bunker, so as to prevent personnel from being trapped in the bunker when the door body cannot be opened upward in time when there is heavy pressure on the entrance and exit of the passage. The double-sealed door 33 is mainly composed of inner and outer circular door bodies of different sizes. The small door 332 is embedded in the center of the outer large door 331. Radiation-shaped reinforcing rib plates are arranged on both the outer large door 331 and the inner small door 332 to ensure a certain steel strength when the large door 331 and the small door 332 are under the heavy pressure of soil and other objects. In addition, sealing strips are arranged around the large and small doors 332 to ensure the tightness of the double-sealed door 33 when it is closed. The large door 331 is connected to the passage by hinges and is opened outward from the bunker. An L-shaped bolt 334 and a horizontal quick clamp 333 are respectively installed on the double-sealed door 33. After closing, it is fixed to the inside of the passage using the L-shaped bolt 334, and the embedded small door 332 is fixed to the inside of the large door 331 using the horizontal quick clamp 333 and is opened inward from the bunker when in use.

[0059] The double-sealed door 33 of the present invention is set to be double-opening and can be used as an emergency exit. When there is an ammunition attack and soil splashes up, it needs to be opened inward to let the soil out before it can be opened outward. Otherwise, when opening the door, the soil is too heavy and it cannot be pushed out when closing the door, so it needs to be opened inward first and then outward.

[0060] The door of the present invention leads straight up and is parallel to the ground, so the force of the shock wave is the smallest.

[0061] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An assembled protective shelter, characterized in that: It includes a protective shelter buried in the soil. The protective shelter includes a shelter structure, end structures, and an access passage structure. The access passage structure is arranged on one side of the shelter structure. The end structures are distributed on both sides of the shelter structure to form an enclosed space. The access passage structure is connected to the end structures. The shelter structure consists of several single arches, and the single arches are directly spliced together. Each single arch includes several unit plates and arch feet. The arch feet are installed below the several unit plates to form an arch body. The unit plate includes a connecting plate, and the connecting plate is provided with a three-dimensional corrugated steel plate. At least two groups of rib plates are installed on the connecting plate to improve the stiffness and structural strength of the unit plate. After the connecting plate is ribbed, the connection and installation of the three-dimensional corrugated steel plate are the connections between the rib plates. Lifting lugs are suspended on the unit plate, and the lifting lugs are used for lifting equipment, assisting in lifting, disassembling, and installing products. The end structure includes side corrugated plates and an airtight door. The airtight door is installed in the middle of the side corrugated plates. The side corrugated plates include five unit corrugated plates, and the five unit corrugated plates are symmetrically arranged to bear the load force in three directions. Each unit corrugated plate is provided with a corrugated plate rib edge and a lower foot seat arranged below the corrugated plate rib edge. The corrugated plate rib edge fits on the upper edge of the unit corrugated plate, and the lower foot seat is connected to the lower end of the unit corrugated plate. The side corrugated plates are connected to the shelter structure through the corrugated plate rib edges and the lower foot seats to construct a longitudinally enclosed space. The access passage structure includes a first quick access and a passage. The first quick access and the passage are respectively arranged on both sides of the shelter structure. The passage is an L-shaped passage. The L-shaped passage allows personnel to enter and exit the shelter structure by climbing a climbing ladder. A load-bearing nested double-sided airtight door is provided at the inlet and outlet of the L-shaped passage. The L-shaped passage is locked by a double-sided airtight door. The double-sided airtight door includes a large door and a small door. The large door and the small door are composed of inner and outer circular door bodies of different sizes. The small door is embedded in the center of the large door. Both the large door and the small door are provided with radiation-resistant reinforcing rib plates to ensure a certain steel strength when under the heavy pressure of overlying objects. Sealing strips are arranged around the large and small doors to ensure the tightness of the double-sided airtight door when closed. The large door is connected to the passage by a hinge and opens outward from the shelter. An L-shaped bolt and a horizontal quick clamp are respectively installed on the double-sided airtight door. After closing, it is fixed to the inside of the passage by the L-shaped bolt, and the embedded small door is fixed to the inside of the large door by the horizontal quick clamp and opens inward from the shelter when in use.

2. The assembled protective shelter according to claim 1, characterized in that: The two groups of rib plates include a first rib plate and a second rib plate. The first rib plate and the second rib plate are symmetrically distributed. Both the first rib plate and the second rib plate are provided with standard erection interfaces. The first rib plate is provided with a horizontal oblong hole, and the second rib plate is provided with a vertical oblong hole. The horizontal oblong hole and the vertical oblong hole form a cross-shaped interface. The unit plates are installed for the shelter structure by a side-by-side combination connection method through the cross-shaped interfaces on the two groups of rib plates.

3. The prefabricated protective bunker according to claim 1, characterized in that: The single arch includes a load-bearing base and a pedal, and the pedal is installed inside the load-bearing base.

4. The prefabricated protective bunker according to claim 1, characterized in that: The arch foot includes a corrugated vertical plate and a box-shaped folded plate. The upper ends of the corrugated vertical plate and the box-shaped folded plate are connected. The box-shaped folded plate is a box-shaped structure for convenient alignment installation with the load-bearing base of the bunker structure. The box-shaped arch foot is designed with a regular frame structure to increase the connection strength at the arch foot. The corrugated vertical plate is provided with corrugated rib edges on its sides, and the corrugated rib edges are butt-jointed with the unit plate. The corrugated vertical plate increases the height of the single arch to expand the internal space of the bunker structure.

5. The prefabricated protective bunker according to claim 1, characterized in that: The middle of the side corrugated plate is provided with an inner door frame and an outer door frame. The outer door frame is connected to the access passage structure. The inner door frame is fixedly installed with an airtight door. The airtight door is fixed to the inner door frame using hinges. When in use, the airtight door rotates inward to open into the bunker structure, and personnel inside the bunker structure can close and lock the airtight door.

6. The prefabricated protective bunker according to claim 1, characterized in that: Ventilation systems are provided at the left and right ends of the end structure. The ventilation systems are installed at the upper corners of the end structure. The ventilation systems are axial flow exhaust fans, and the axial flow exhaust fans are installed in a diagonal staggered manner to maximize the circulating ventilation inside the bunker structure.

7. The prefabricated protective bunker according to claim 1, characterized in that: A drainage system is provided at the bottom of the bunker structure. The drainage system includes at least two sewage pumps and drainage pipelines. The sewage pumps are connected to the drainage pipelines to discharge the accumulated water at the bottom of the bunker structure to keep the inside of the bunker structure dry.

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