Air defense rear opening sealing and reinforcing system structure

Abstract

The utility model belongs to the civil air defence engineering technical field relates to a civil air defence rear hole sealing reinforcing system structure. The utility model, including the protection sleeve pipe of installing in civil air defence wall, the protection sleeve pipe front end is equipped with detachable screw thread flange piece, detachable screw thread flange piece and protection sleeve pipe front end outer circle are screw jointed cooperation, protection sleeve pipe rear end is equipped with rear end flange piece, the grouting part and exhaust part are opened in rear end flange piece, when protection sleeve pipe installs in civil air defence wall, the pouring space for pouring civil air defence protection blocking material is formed between protection sleeve pipe outer circle and civil air defence wall. The utility model in the using process, through screw joint realizes detachable screw thread flange piece and the quick assembly of protection sleeve pipe, need not complicated welding process, reduce construction difficulty, combine the multiple sealing structure of the flange adhesive seal and detachable plugging module piece of civil air defence protection blocking material filling, abutting gap in pouring space, ensure system overall airtightness, satisfy civil air defence engineering protection requirement.

Description

Technical Field

[0001] This utility model belongs to the field of civil defense engineering technology and relates to a structure of a civil defense rear opening sealing reinforcement system. Background Technology

[0002] In the construction and subsequent renovation of civil defense projects, post-drilling operations are often required on existing civil defense walls (100m²) due to pipeline laying and equipment installation needs. As the core barrier of the protective project, the airtightness, blast resistance, and protective performance of the civil defense wall (100m²) directly affect the safety of the project. However, traditional post-drilling construction methods have many problems: the gap between the casing and the wall is not completely sealed after drilling, leading to air and water leakage and failing to meet airtightness requirements; the stability of the casing-wall fixing structure is insufficient, making it prone to loosening under external forces such as shock waves; the sealing structure is mostly fixed, requiring the destruction of the original structure for pipeline replacement or maintenance, resulting in high costs and low efficiency; air bubbles are easily left during grouting, leading to incomplete filling of the protective sealing material and affecting the reinforcement effect. Therefore, there is an urgent need for a convenient, reliable, structurally stable, and easy-to-maintain post-drilling airtight reinforcement system for civil defense projects.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, a Chinese patent discloses a modular pipe hole sealing device for civil defense engineering [Application No.: 201821863370.8]. Its structure includes a front pressure plate, a hose, a sealing module, a rear pressure plate, bolts, and nuts. The hose is connected to the front and rear pressure plates on both sides; the front pressure plate, hose, and rear pressure plate are connected and fixed by multiple bolts; a rectangular rounded corner sealing space is formed inside the hose; multiple sealing modules are set inside the sealing space; each sealing module contains several solid unit rubber blocks with a fan-shaped, square, or rectangular opening in cross-section. However, this solution is still prone to defects such as incomplete gap sealing, easy air and water leakage, and insufficient structural stability leading to loosening during use. Summary of the Invention

[0004] The purpose of this utility model is to address the above-mentioned problems by providing a structure for a civil defense rear opening sealing reinforcement system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A structure for a rear-opening sealing reinforcement system for civil defense includes a protective sleeve installed inside a civil defense wall. A detachable threaded flange is fitted at the front end of the protective sleeve, and the detachable threaded flange is screwed onto the outer circumference of the front end of the protective sleeve. A rear flange is provided at the rear end of the protective sleeve, and the rear flange has a grouting section and a venting section. When the protective sleeve is installed inside the civil defense wall, a grouting space for injecting civil defense protective sealing material is formed between the outer circumference of the protective sleeve and the civil defense wall. The grouting space is connected to the grouting section. A detachable sealing module is installed at the rear end of the protective sleeve.

[0007] In the above-mentioned civil defense rear opening sealing reinforcement system structure, the detachable threaded flange includes an internally threaded flange plate disposed at the front end of the protective sleeve, and the front end of the protective sleeve has an external thread that can be screwed into the internal thread of the internally threaded flange plate.

[0008] In the above-mentioned civil defense rear opening sealing reinforcement system structure, the outer diameter of the internal thread flange is larger than the outer diameter of the protective sleeve.

[0009] In the aforementioned air defense rear opening sealing reinforcement system structure, the rear flange and the internal thread flange are parallel to each other.

[0010] In the above-mentioned air defense rear opening sealed reinforcement system structure, the grouting part includes a grouting hole set in the rear flange plate. When the protective sleeve is installed in the air defense wall, the grouting hole is connected to the grouting space.

[0011] In the above-mentioned air defense rear opening sealed reinforcement system structure, the venting part includes a vent hole provided in the rear flange plate. The vent hole and the grouting hole are parallel to each other, and the distance from the vent hole to the center of the rear flange plate is greater than the distance from the grouting hole to the center of the rear flange plate.

[0012] In the above-mentioned air defense rear opening sealed reinforcement system structure, when the rear flange is in close contact with the air defense wall, an abutment gap is formed, and the abutment gap is filled with flange adhesive.

[0013] In the above-mentioned civil defense rear opening sealing reinforcement system structure, the detachable sealing module includes a rubber tube set at the rear end of the protective sleeve, and a sealing module is provided inside the rubber tube. The sealing module is composed of rubber blocks and has pipeline reserved holes.

[0014] In the above-mentioned air defense rear opening sealed reinforcement system structure, the front and rear ends of the hose are respectively provided with a front pressure plate and a rear pressure plate, and the outer diameter of the rear pressure plate is larger than the outer diameter of the front pressure plate.

[0015] In the above-mentioned air defense rear opening sealing reinforcement system structure, one end of the sealing module abuts against the front pressure plate and the other end abuts against the rear pressure plate. The rear pressure plate has several bolt holes and abuts against the rear flange.

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] 1. In use, this utility model enables the rapid assembly of detachable threaded flange parts and protective sleeves through threaded connection, eliminating the need for complex welding processes and reducing construction difficulty. Combined with the filling of the injection space with civil defense protective sealing material, the sealing of the flange gap with adhesive, and the multiple sealing structure of the detachable sealing module, the overall airtightness of the system is ensured, meeting the protection requirements of civil defense projects.

[0018] 2. The front internal thread flange and the rear flange in this utility model form a bidirectional fixation, which, together with the protective plugging material after injection, greatly improves the connection strength between the sleeve and the wall and has excellent impact resistance.

[0019] 3. This utility model, through the design of detachable sealing modules and threaded flanges, facilitates subsequent pipeline replacement or system maintenance without damaging the main structure of the air-raid shelter. The optimized design of the grouting and venting positions ensures that air is fully discharged during the grouting process, and the protective sealing material is filled densely, avoiding the impact of air bubbles on the reinforcement effect.

[0020] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0021] Figure 1 This is an installation diagram of this utility model.

[0022] Figure 2 yes Figure 1 A schematic diagram of the cross-section at point AA.

[0023] Figure 3 yes Figure 2 Enlarged diagram of point B in the middle.

[0024] Figure 4 This is a structural diagram of the rear flange.

[0025] In the diagram: 1. Protective sleeve; 2. Removable threaded flange; 3. Rear flange; 4. Grouting section; 5. Venting section; 6. Grouting space; 7. Removable sealing module; 8. Internal thread flange; 9. External thread; 10. Grouting hole; 11. Venting hole; 12. Abutment gap; 13. Rubber hose; 14. Sealing module; 15. Pipeline reserved hole; 16. Front pressure plate; 17. Rear pressure plate; 18. Threaded hole; 100. Civil defense wall; 200. Civil defense protective sealing material. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1-4As shown, a structure for a rear-opening sealing reinforcement system for civil defense includes a protective sleeve 1 installed inside a civil defense wall 100. A detachable threaded flange 2 is fitted at the front end of the protective sleeve 1, and the detachable threaded flange 2 is screwed into the outer circle of the front end of the protective sleeve 1. A rear flange 3 is provided at the rear end of the protective sleeve 1. A grouting part 4 and an exhaust part 5 are provided inside the rear flange 3. When the protective sleeve 1 is installed inside the civil defense wall 100, an grouting space 6 is formed between the outer circle of the protective sleeve 1 and the civil defense wall 100 for grouting civil defense protective sealing material 200. The grouting space 6 is connected to the grouting part 4. A detachable sealing module 7 is installed at the rear end of the protective sleeve 1.

[0028] In this embodiment, the protective sleeve 1 is installed through the opening of the air-raid shelter wall 100. A detachable threaded flange 2 is screwed onto its front end, and a rear flange 3 is provided at its rear end. A grouting space 6 is formed between the outer circumference of the protective sleeve 1 and the inner wall of the opening in the air-raid shelter wall 100. A grouting section 4 on the rear flange 3 is connected to the grouting space 6 for injecting the air-raid shelter protective sealing material 200. An venting section 5 is used to assist in venting and ensure tight grouting. A detachable sealing module 7 is installed at the rear end of the protective sleeve 1 to achieve sealing inside the sleeve and between the sleeve and the pipeline. The reserved protective sleeve 1 is the basic support component of the system. After the 100mm opening through the air-raid shelter wall, the front end is fixed with a detachable threaded flange 2 by bolts, and the rear end is positioned by a rear flange 3. The grouting part 4 and the venting part 5 work together to fill the grouting space 6. The detachable sealing module 7 seals the inside of the sleeve. Through the coordinated cooperation of various components, the reinforcement and sealing of the rear opening position are integrated, solving the problems of complex installation and unreliable sealing of traditional structures, and providing a stable structural support and reliable airtight protection for the rear opening position.

[0029] Combination Figure 1-4 As shown, the detachable threaded flange 2 includes an internally threaded flange 8 disposed at the front end of the protective sleeve 1, and the front end of the protective sleeve 1 has an external thread 9 that can be screwed into the internal thread of the internally threaded flange 8.

[0030] Specifically, the internal thread flange 8 is screwed into the external thread 9 at the front end of the protective sleeve 1 through its own internal thread, so as to realize the assembly of the detachable threaded flange 2 and the protective sleeve 1. The threaded connection method makes the installation and disassembly of the detachable threaded flange 2 and the protective sleeve 1 convenient, which facilitates the position adjustment during construction and the later maintenance and replacement. It eliminates the need for complex connection processes such as welding, thus reducing the difficulty of construction.

[0031] The outer diameter of the internally threaded flange 8 is larger than the outer diameter of the protective sleeve 1.

[0032] In this embodiment, the internally threaded flange 8 is sleeved on the front end of the protective sleeve 1. Due to its larger outer diameter, its edge can extend beyond the outer circle of the protective sleeve 1 after installation, forming a stepped structure with the protective sleeve 1. The larger outer diameter design allows the internally threaded flange 8 to form a more effective contact with the front end face of the protective sleeve 1, increasing the contact area with the wall surface, preventing the protective sleeve 1 from sinking into the wall opening when under force, enhancing the stability of the front end fixation, and improving the overall impact resistance of the structure.

[0033] Combination Figure 2 , Figure 3 As shown, the rear flange 3 and the internal thread flange 8 are parallel to each other.

[0034] In this embodiment, the rear flange 3 is located at the rear end of the protective sleeve 1, and the internal thread flange 8 is installed at the front end of the protective sleeve 1. The two are parallel to each other with the protective sleeve 1 as the axis and are perpendicular to the axis of the protective sleeve 1. The parallel arrangement ensures that the protective sleeve 1 is axially perpendicular to the wall surface within the opening of the air-raid shelter wall 100, avoiding uneven force caused by the sleeve tilting. When subjected to external force, the force can be evenly transmitted to the air-raid shelter wall 100 through the two parallel flanges, thereby improving the structural stability and impact resistance of the system.

[0035] The grouting section 4 includes a grouting hole 10 disposed in the rear flange 3. When the protective sleeve 1 is installed in the air-raid shelter wall 100, the grouting hole 10 is connected to the grouting space 6.

[0036] In this embodiment, the grouting part 4 includes a grouting hole 10 opened in the rear flange 3. When the protective sleeve 1 is installed in the air-raid shelter wall 100, the grouting hole 10 is connected to the grouting space 6. The grouting hole 10 passes through the rear flange 3, with one end connected to the external grouting equipment and the other end directly connected to the grouting space 6, forming a channel for injecting protective plugging material. The setting of the grouting hole 10 provides a precise grouting channel for the grouting space 6, ensuring that the air-raid shelter protective plugging material 200 can be smoothly injected and filled between the protective sleeve 1 and the air-raid shelter wall 100, enhancing the connection strength and airtightness between the two, and avoiding the problem of insufficient filling of plugging material in the traditional grouting method.

[0037] Combination Figure 4 As shown, the venting section 5 includes a venting hole 11 disposed in the rear flange 3. The venting hole 11 is parallel to the grouting hole 10. The distance from the venting hole 11 to the center of the rear flange 3 is greater than the distance from the grouting hole 10 to the center of the rear flange 3.

[0038] In this embodiment, both the vent hole 11 and the grouting hole 10 are located on the rear flange 3, and their directions are parallel. The vent hole 11 is located closer to the edge of the rear flange 3. During the grouting process, the air in the grouting space 6 is discharged through the vent hole 11 under the pressure of the protective plugging material. The parallel arrangement facilitates processing and operation, and the outer position of the vent hole 11 ensures that the air in the grouting space 6 is fully discharged. When plugging material overflows from the vent hole 11, it indicates that the grouting space 6 has been fully filled, effectively solving the problem of residual air bubbles in traditional grouting, ensuring that the protective plugging material is densely filled, and improving the reinforcement effect.

[0039] When the rear flange 3 is tightly attached to the air-raid shelter wall 100, an abutment gap 12 is formed, and the abutment gap 12 is filled with flange adhesive.

[0040] In this embodiment, the rear flange 3 is installed in close contact with the rear end face of the air-raid shelter wall 100. Due to processing and installation errors, a small abutment gap 12 is formed. After the flange adhesive is injected into the gap, it cures and bonds the rear flange 3 to the air-raid shelter wall 100 together. The flange adhesive fills the abutment gap 12, further enhancing the sealing between the rear flange 3 and the air-raid shelter wall 100, preventing gas or liquid from leaking from the contact surface, and improving the connection strength between the rear flange 3 and the air-raid shelter wall 100, making the structure more stable.

[0041] Combination Figure 1-3 As shown, the detachable sealing module 7 includes a rubber tube 13 disposed at the rear end of the protective sleeve 1. A sealing module 14 is provided inside the rubber tube 13. The sealing module 14 is composed of rubber blocks and has a pipeline reserved hole 15.

[0042] In this embodiment, the rubber tube 13 is installed inside the rear end of the protective sleeve 1, the sealing module 14 is placed inside the rubber tube 13, the pipeline pre-drilled hole 15 allows the pipeline to pass through, the rubber block material of the sealing module 14 is elastic, the rubber tube 13 provides installation space and support for the sealing module 14, the rubber block material of the sealing module 14 can achieve sealing through deformation, the pipeline pre-drilled hole 15 meets the pipeline passing through requirements, and the detachable design facilitates the replacement of the sealing module 14 or adjustment of the pipeline as needed in the future, enhancing the flexibility and maintainability of the system.

[0043] Combination Figure 1-3 As shown, the hose 13 is provided with a front pressure plate 16 and a rear pressure plate 17 at its front and rear ends, respectively, and the outer diameter of the rear pressure plate 17 is larger than the outer diameter of the front pressure plate 16.

[0044] In this embodiment, the front pressure plate 16 is located at the front end of the hose 13, and the rear pressure plate 17 is located at the rear end of the hose 13. Both of them abut against the two ends of the sealing module 14 respectively. The rear pressure plate 17 has a larger outer diameter, which allows it to better cooperate with the rear flange 3 during installation. The front pressure plate 16 and the rear pressure plate 17 together compress the sealing module 14. The larger outer diameter of the rear pressure plate 17 increases the contact area with the rear flange 3, making the pressure distribution more uniform, ensuring that the sealing module 14 can fully deform, improving the sealing effect, and enhancing the overall structural stability of the sealing module.

[0045] Combination Figure 1-3 As shown, one end of the sealing module 14 abuts against the front pressure plate 16, and the other end abuts against the rear pressure plate 17. The rear pressure plate 17 has several screw holes 18, and the rear pressure plate 17 abuts against the rear flange 3.

[0046] In this embodiment, the sealing module 14 is sandwiched between the front pressure plate 16 and the rear pressure plate 17. The rear pressure plate 17 is fastened to the rear flange 3 by engaging with the bolts through the bolt holes 18 on the rear pressure plate 17. During the fastening process, the front pressure plate 16 and the rear pressure plate 17 squeeze the sealing module 14 to deform it. The bolt connection is used to fix the rear pressure plate 17 to the rear flange 3, thereby causing the sealing module 14 to be squeezed and deformed, tightly fitting the inner wall of the hose 13 and the pipeline passing through it, achieving a reliable seal. The bolt connection method facilitates installation and disassembly, and is convenient for later maintenance.

[0047] In general, this utility model decomposes the system into independent modules such as protective sleeves, detachable threaded flanges, rear flanges, and detachable sealing modules. These modules are connected by threads or bolts, enabling rapid installation and disassembly. Compared to traditional fixed structures, this solves the problems of complex installation and the need to damage the wall for later maintenance, significantly improving construction efficiency and maintenance flexibility. Furthermore, it employs a triple sealing structure—filling the injection space with sealing material, sealing the flange gap with adhesive, and sealing the elastic sealing module through deformation—ensuring comprehensive airtightness. Additionally, the parallel front and rear flanges form bidirectional force support, and the unequal diameter front and rear pressure plates... By optimizing the pressure distribution, the system is subjected to uniform stress when subjected to external forces such as shock waves, significantly improving its impact resistance. This overcomes the shortcomings of traditional structures, such as single sealing and uneven stress distribution. Furthermore, the design incorporates differentiated grouting holes and vent holes. The grouting holes are directly connected to the grouting space, while the vent holes are located closer to the edge of the flange and parallel to the grouting holes. This design utilizes the principle that air is lighter than the grout, allowing air to naturally escape from the vent holes during the grouting process. When grout appears to be blocked in the vent holes, it can be determined that the filling is complete. This completely solves the technical problem of air bubbles causing incomplete reinforcement in traditional grouting processes, ensuring reliable filling effect of the protective grout.

[0048] The working principle of this utility model is as follows:

[0049] The airtight reinforcement system for rear openings in civil defense walls achieves the reinforcement and sealing functions of openings through a three-step coordinated process of "fixing, grouting, and sealing." The specific process is as follows:

[0050] Fixed installation stage: A hole with a preset diameter is opened on the air-raid shelter wall 100, and the protective sleeve 1 is inserted into the hole. The internal thread flange 8 is screwed onto the external thread 9 at the front end of the protective sleeve 1. The position of the internal thread flange 8 is adjusted so that it fits tightly against the front end face of the air-raid shelter wall 100. The rear end flange 3 naturally fits against the rear end face of the air-raid shelter wall 100, forming a two-way fixed structure to ensure that the protective sleeve 1 remains axially stable in the hole.

[0051] Gap grouting stage: The civil defense protective plugging material 200 is pumped into the grouting space 6 through the grouting hole 10 on the rear flange 3. Under pressure, the plugging material fills all the gaps between the protective sleeve 1 and the civil defense wall 100. At the same time, the air in the grouting space 6 is squeezed by the plugging material and discharged from the vent hole 11, which is located further out. When the plugging material overflows from the vent hole 11, it indicates that the gap has been fully filled. Grouting is stopped and the plugging material is allowed to solidify to form a structural reinforcement layer.

[0052] Sealing and plugging stage: Install the detachable plugging module 7 at the rear end of the protective sleeve 1, insert the hose 13 with the front pressure plate 16 into the rear end of the sleeve, install the sealing module 14 with the pipeline pre-drilled hole 15, and then install the rear pressure plate 17. Use bolts to fasten the rear pressure plate 17 to the rear flange 3 through the bolt holes 18 on the rear pressure plate 17. During the bolt tightening process, the front pressure plate 16 and the rear pressure plate 17 squeeze the sealing module 14 to make it elastically deform, tightly fit the inner wall of the hose 13 and the pipeline, and achieve a tight seal inside the sleeve. At the same time, inject flange adhesive into the abutment gap 12 between the rear flange 3 and the air-raid shelter wall 100 to further strengthen the rear end seal. Through the above process, the system realizes the integrated functions of structural reinforcement, gap sealing and internal plugging at the rear opening position of the air-raid shelter wall, meeting the protection requirements of the air-raid shelter project. When maintaining or replacing pipelines in the later stage, the rear pressure plate 17 and the sealing module 14 can be removed for operation without damaging the wall or the sleeve body, reducing maintenance costs.

[0053] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model.

[0054] Although this document frequently uses terms such as protective sleeve 1, detachable threaded flange 2, rear flange 3, grouting section 4, venting section 5, grouting space 6, detachable sealing module 7, internal thread flange 8, external thread 9, grouting hole 10, venting hole 11, abutment gap 12, hose 13, sealing module 14, pipeline reserved hole 15, front pressure plate 16, rear pressure plate 17, bolt hole 18, air-raid shelter wall 100, and air-raid shelter protective sealing material 200, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A structure for a rear-opening, sealed reinforcement system for civil defense, comprising a protective sleeve (1) installed within a civil defense wall (100), characterized in that, The protective sleeve (1) is fitted with a detachable threaded flange (2) at the front end, and the detachable threaded flange (2) is screwed into the outer circle of the front end of the protective sleeve (1). The protective sleeve (1) is fitted with a rear flange (3) at the rear end, and a grouting part (4) and an exhaust part (5) are provided in the rear flange (3). When the protective sleeve (1) is installed in the air-raid shelter wall (100), an grouting space (6) is formed between the outer circle of the protective sleeve (1) and the air-raid shelter wall (100) for grouting the air-raid shelter protective plugging material (200). The grouting space (6) is connected to the grouting part (4). The protective sleeve (1) is fitted with a detachable sealing module (7) at the rear end.

2. The structure of the air-raid shelter rear opening sealing reinforcement system according to claim 1, characterized in that, The detachable threaded flange (2) includes an internally threaded flange (8) disposed at the front end of the protective sleeve (1), and the front end of the protective sleeve (1) has an external thread (9) that can be screwed into the internal thread of the internally threaded flange (8).

3. The structure of the air-raid shelter rear opening sealing reinforcement system according to claim 2, characterized in that, The outer diameter of the internal threaded flange (8) is larger than the outer diameter of the protective sleeve (1).

4. The structure of the air-raid shelter rear opening sealing reinforcement system according to claim 3, characterized in that, The rear flange (3) and the internal thread flange (8) are parallel to each other.

5. The structure of the air-raid shelter rear opening sealing reinforcement system according to claim 4, characterized in that, The grouting section (4) includes a grouting hole (10) located in the rear flange (3). When the protective sleeve (1) is installed in the air-raid shelter (100), the grouting hole (10) is connected to the grouting space (6).

6. The structure of the air-raid shelter rear opening sealing reinforcement system according to claim 5, characterized in that, The venting section (5) includes a vent hole (11) disposed in the rear flange (3). The vent hole (11) is parallel to the grouting hole (10). The distance from the vent hole (11) to the center of the rear flange (3) is greater than the distance from the grouting hole (10) to the center of the rear flange (3).

7. The structure of the air-raid shelter rear opening sealing reinforcement system according to claim 6, characterized in that, When the rear flange (3) is in close contact with the air-raid shelter wall (100), abutment gap (12) is formed, and the abutment gap (12) is filled with flange adhesive.

8. The structure of the air-raid shelter rear opening sealing reinforcement system according to claim 1, characterized in that, The detachable sealing module (7) includes a rubber tube (13) located at the rear end of the protective sleeve (1). The rubber tube (13) is provided with a sealing module (14), which is composed of rubber blocks and has a pipeline reserved hole (15) inside.

9. The structure of the air-raid shelter rear opening sealing reinforcement system according to claim 8, characterized in that, The hose (13) is provided with a front pressure plate (16) and a rear pressure plate (17) at its front and rear ends, respectively. The outer diameter of the rear pressure plate (17) is larger than the outer diameter of the front pressure plate (16).

10. The structure of the air-raid shelter rear opening sealing reinforcement system according to claim 9, characterized in that, One end of the sealing module (14) abuts against the front pressure plate (16), and the other end abuts against the rear pressure plate (17). The rear pressure plate (17) has several screw holes (18) and abuts against the rear flange (3).

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