Nuclear power plant projectile resistant aperture intercept netting device and method of installation

Abstract

The application relates to a hole opening intercepting net device for resisting flying objects in a nuclear power plant, a plurality of groups of embedded parts are embedded on a wall body and located at opposite corners of the hole opening; a positioning beam perpendicular to the wall body is welded on the outer wall of the embedded part, a first pull rod is detachably installed on two groups of the positioning beams adjacent in the horizontal direction, and a second pull rod is detachably installed on two groups of the positioning beams adjacent in the vertical direction; a plurality of groups of suspension parts are movably installed on the first pull rod and the second pull rod in intervals, an intercepting net is detachably connected to the suspension part, and the intercepting net is installed in the interiors of the first pull rod and the second pull rod through the suspension part. The application can realize workshop manufacturing and on-site hoisting, and compared with a traditional inverted L-shaped reinforced concrete protective cover, the application can effectively improve construction efficiency. The application can flexibly adjust the scheme according to actual conditions, has high operability, and the design improves the service life and working effect of the hole opening intercepting net device.

Description

Technical Field

[0001] This application relates to the field of nuclear power plant safety protection technology, and in particular to a device for intercepting projectiles at the entrance of a nuclear power plant and its installation method. Background Technology

[0002] A nuclear power plant is a power plant that converts nuclear energy into thermal energy to generate steam for a turbine, which then drives a generator to produce commercial electricity. The structural design of a nuclear power plant needs to consider the impact of tornadoes, severe geological disasters, or projectiles from drones. The protection design of critical locations such as ventilation openings and explosion vents on the exterior walls of nuclear power plants has always been a key focus for designers. These locations must consider both the flow area for ventilation or explosion venting and the ability to withstand impacts from tornado projectiles. Traditional methods use inverted L-shaped reinforced concrete protective covers at the openings, but because they are suspended from the exterior walls, construction is difficult and affects the project's construction schedule.

[0003] The industry has mainly optimized the tilt angle of the "inverted L-shaped" reinforced concrete protective cover, but it has not fundamentally changed the feasibility of construction. The "inverted L-shaped" reinforced concrete protective cover is difficult to construct, has a long construction period and high cost, and is inconvenient for subsequent maintenance and repair after long-term use. This invention is based on the protection requirements and functions of the opening and proposes an interception net device that can be assembled in the workshop and modularly hoisted on site. Summary of the Invention

[0004] Therefore, it is necessary to provide a nuclear power plant entrance interception net device to address the problems of traditional "inverted L-shaped" reinforced concrete protective covers, which are difficult to construct, have a long construction period and high cost, and are inconvenient for subsequent maintenance and repair after long-term use.

[0005] According to one aspect of this application, a nuclear power plant anti-launching-object-blocking mesh device is provided for a wall, the wall having an opening, the nuclear power plant anti-launching-object-blocking mesh device including a plurality of embedded parts pre-embedded in the wall; positioning beams are provided on the outer wall of the embedded parts, at least a portion of the positioning beams are spaced apart along a first direction, a first tie rod is detachably installed on two adjacent positioning beams in the first direction, at least a portion of the positioning beams are spaced apart along a second direction, a second tie rod is detachably installed on two adjacent positioning beams in the second direction, the first direction and the second direction intersect;

[0006] Multiple suspension components are movably installed at intervals on both the first and second tie rods. An interception net is detachably connected to each suspension component. The interception net is installed between the first and second tie rods via the suspension components, and the interception net is positioned opposite the opening.

[0007] In one embodiment, the first tie rod consists of a plurality of first sub-tires, and the second tie rod consists of a plurality of vertical sub-stems.

[0008] In one embodiment, the embedded part is pre-embedded in the reinforced concrete structure of the wall using anchor bars.

[0009] In one embodiment, the first tie rod, the second tie rod, and the positioning beam are all connected by bolts for easy removal.

[0010] In one embodiment, the intercepting net is provided with rain and snow protection film on both sides of the intercepting net along the horizontal direction and on the side of the intercepting net opposite to the direction of gravity; the intercepting net is connected to at least a portion of the positioning beams; the positioning beams are also provided with holes and slots for fixing the rain and snow protection film.

[0011] In one embodiment, the rain and snow protection film is made of at least one of the following materials: PVC waterproof film, polyethylene woven fabric, and composite rain protection film.

[0012] In one embodiment, the dimension b of the first tie rod along the first direction is the sum of the dimension of the opening along the first direction, half the dimension of the embedded part along the first direction, and the distance between the edge of the embedded part and the edge of the opening along the first direction, and the dimension h of the second tie rod along the second direction is the dimension of the opening along the second direction.

[0013] In one embodiment, the dimension b of the first tie rod along the first direction is the dimension of the opening along the first direction, and the dimension h of the second tie rod along the second direction is the sum of the dimension of the opening along the second direction, half the dimension of the embedded part along the second direction, and the distance between the edge of the embedded part along the second direction and the edge of the opening along the second direction.

[0014] In one embodiment, the vertical distance 'a' between the interception net and the wall is 10cm-30cm.

[0015] In one embodiment, the suspension element is made of an alloy material.

[0016] In one embodiment, the suspension component includes a positioning rod, a first locking clamp, and a threaded ring; the positioning rod is movably mounted on the first pull rod and the second pull rod, the first locking clamp is located at the end of the positioning rod near the intercepting net, and a second locking clamp is rotatably mounted on the first locking clamp; a locking arm is provided at the end of the second locking clamp away from the intercepting net, the positioning rod has a recess for receiving the locking arm, and the threaded ring is threadedly mounted on the positioning rod and used to fix the locking arm.

[0017] The portion of the positioning rod and the locking arm located in the recess are both inserted into the threaded ring and are threadedly connected to the inner wall of the threaded ring. The threaded ring can move axially relative to the positioning rod.

[0018] In one embodiment, the mesh density at the end of the interceptor net away from the direction of gravity is greater than the mesh density at the end facing the direction of gravity.

[0019] In one embodiment, the intercepting net is tilted, and the vertical distance 'a' between the intercepting net and the wall gradually decreases along the direction of gravity. This application has the following beneficial effects:

[0020] This application provides a portal mesh interception device that can be manufactured in a workshop and installed on-site. Compared with the traditional "inverted L-shaped" reinforced concrete protective cover, it can effectively improve on-site construction efficiency. Furthermore, the design scheme of this invention can be flexibly adjusted according to actual conditions, exhibiting high practicality and operability. The lengths of the first tie rod (b), the second tie rod (h), and the vertical distance (a) between the interception mesh and the wall can be determined based on the impact energy of different types of projectiles and actual needs. This device possesses the ability to withstand the impact of tornado projectiles and drones, while simultaneously improving on-site constructability. This design enhances the service life and operational effectiveness of the portal mesh interception device for nuclear power plants. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of an embodiment of this application.

[0022] Figure 2 for Figure 1 Enlarged view of the local structure at point A in the middle.

[0023] Figure 3 This is a side view of an embodiment of this application.

[0024] Figure 4 This is a partial structural diagram of the suspension component in one embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Wall; 2. Opening; 3. Embedded part; 4. Positioning beam; 5. First tie rod; 501. First sub-tie rod; 6. Second tie rod; 601. Vertical sub-rod; 7. Suspension part; 8. Interception net; 9. Rain and snow protection film; 10. Positioning rod; 11. First locking clamp; 12. Second locking clamp; 13. Locking arm; 14. Recessed part; 15. Threaded ring. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0033] The inverted L-shaped reinforced concrete protective cover used in the existing technology has obvious drawbacks, including complex and difficult construction. The inverted L-shaped reinforced concrete protective cover is cast integrally with the wall 1, which makes subsequent inspection and maintenance inconvenient after long-term use.

[0034] See Figures 1-4 , Figures 1-4 This paper illustrates the overall structure of a nuclear power plant's interceptor net device for defending against projectiles according to an embodiment of this application. The device includes a wall 1 and an opening 2. Multiple sets of embedded parts 3 are pre-embedded in the wall 1 at opposite corners of the opening 2. Positioning beams 4 perpendicular to the wall 1 are welded to the outer walls of the embedded parts 3. First tie rods 5 are detachably installed on two adjacent sets of positioning beams 4 in the horizontal direction, and second tie rods 6 are detachably installed on two adjacent sets of positioning beams 4 in the vertical direction. Multiple sets of suspension members 7 are movably installed at intervals on the first tie rods 5 and the second tie rods 6. An interceptor net 8 is detachably connected to the suspension members 7, and the interceptor net 8 is installed inside the first tie rods 5 and the second tie rods 6 via the suspension members 7.

[0035] During installation, the embedded part 3 is pre-cast into the wall 1 during the pouring of concrete. After the concrete reaches the preset hardness, the positioning beam 4 is vertically welded onto the outer wall of the embedded part 3. Then, the first tie rod 5 and the second tie rod 6 are hoisted onto the positioning beam 4 using external hoisting equipment and secured with bolts. Multiple sets of suspension members 7 are then installed at intervals on the first tie rod 5 and the second tie rod 6. Finally, the intercepting net 8 is installed between the first tie rod 5 and the second tie rod 6 via the suspension members 7.

[0036] See Figures 1-2 The first pull rod 5 is composed of multiple first sub-pull rods 501, and the second pull rod 6 is composed of multiple vertical sub-rods 601.

[0037] In some embodiments, when the interception net 8 device of this application is in use, the first pull rod 5 and the second pull rod 6 will be subjected to a large impact force. In order to improve the service life and strength and avoid accidental breakage of the first pull rod 5 and the second pull rod 6, the first pull rod 5 and the second pull rod 6 are respectively composed of multiple sets of first sub-pull rods 501 and multiple sets of vertical sub-rods 601.

[0038] In some embodiments, the first sub-pull rod 501 and the vertical sub-rod 601 are fixed together by welding.

[0039] See Figures 1-3 The embedded part 3 is embedded in the reinforced concrete structure of the wall 1 using anchor bars.

[0040] In some embodiments, anchor bars refer to steel bars that anchor the embedded part 3 to the concrete. To improve the strength and embedding effect of the interception net 8 device, the embedded part 3 is embedded in the wall 1 using anchor bars. To improve the interception effect and impact resistance, the distance between the edge of the embedded part 3 and the edge of the opening 2 is not less than 50mm. The specific distance can be selected according to the usage environment and the weight and type of projectiles.

[0041] The material of the interception net 8, the diameter of the mesh, and the connection method between the interception net 8 and the suspension component 7 are determined based on the impact energy of the projectile. The calculation can be performed using empirical formulas or finite element analysis.

[0042] In some embodiments, when the interception net 8 is impacted by a projectile, the interception net 8 deforms. At this time, the load generated by the positioning beam 4 is transferred to the reinforced concrete wall 1 through the embedded part 3. Those skilled in the art can design the strength of the embedded part 3 according to the load.

[0043] See Figures 1-3 The first tie rod 5, the second tie rod 6, and the positioning beam 4 are all connected by bolts for easy removal.

[0044] In some embodiments, this application mainly designs an interception net 8 device that can be assembled in the workshop and modularly hoisted on site, based on the protection requirements and functions of the opening 2. In order to facilitate the maintenance and disassembly of the device, the first tie rod 5 and the second tie rod 6 are both quickly installed onto the positioning beam 4 by bolts.

[0045] In some embodiments, the first tie rod 5 and the second tie rod 6 can be either separate or integrated. When a separate structure is used, the first tie rod 5 and the second tie rod 6 are hoisted separately using external hoisting equipment. When an integrated structure is used, the large frame composed of the first tie rod 5 and the second tie rod 6 is hoisted and installed as a whole using external hoisting equipment.

[0046] See Figure 3 The intercepting net 8 is provided with rain and snow protection film 9 on both sides of the intercepting net 8 along the horizontal direction and on the side of the intercepting net 8 away from the direction of gravity; the intercepting net 8 is connected to at least a portion of the positioning beams 4; the positioning beams 4 are also reserved with holes and slots for fixing the rain and snow protection film 9.

[0047] In some embodiments, since the projectile enters the opening 2 at a certain angle, no intercepting net 8 is designed between the positioning beams 4. During use, to prevent debris from accidentally falling into the opening 2 during rain or snow, a rainproof and snowproof membrane 9 is designed to shield the top and sides of the opening 2. To facilitate the installation and fixing of the rainproof and snowproof membrane 9, a buttonhole structure is designed, thereby locking the rainproof and snowproof membrane 9 to the positioning beams 4 using ropes, buckles, and other components.

[0048] See Figure 3 The rainproof and snowproof film 9 is made of at least one of the following materials: PVC waterproof film, polyethylene woven fabric, and composite rainproof film.

[0049] In some embodiments, polyvinyl chloride (PVC) waterproof membrane is a high-performance polymer waterproof material, with polyvinyl chloride resin as the main raw material. This product features high tensile strength, high elongation, low shrinkage, good low-temperature flexibility, and long service life.

[0050] Polyethylene, abbreviated as PE, is a thermoplastic resin obtained by polymerizing ethylene monomers. Polyethylene has excellent low-temperature resistance (minimum service temperature can reach -100~-70°C), good chemical stability, and because the polymer molecules are linked by carbon-carbon single bonds, it can resist the corrosion of most acids and alkalis.

[0051] During use, in order to prevent rain, snow or dust and debris from entering the opening 2, a rainproof and snowproof film 9 is designed to provide shelter from wind and rain.

[0052] See Figure 1 The dimension b of the first tie rod 5 along the first direction is the sum of the dimension b of the opening 2 along the first direction, half of the dimension b of the embedded part 3 along the first direction, and the distance b of the edge of the embedded part 3 and the edge of the opening 2 along the first direction. The dimension h of the second tie rod 6 along the second direction is the dimension h of the opening 2 along the second direction.

[0053] In some embodiments, when the embedded part 3 is set at a height flush with the upper and lower ends of the opening 2, there is a certain distance between the embedded part 3 and the left and right ends of the opening 2. Therefore, the length h of the second tie rod 6 is the same as the height of the opening 2. Since the embedded part 3 has a certain width, the two ends of the first tie rod 5 are movably mounted on the positioning beam 4, and the positioning beam 4 is located in the middle of the embedded part 3. Therefore, the length b of the first tie rod 5 is the sum of the width of the opening 2, half the width of the embedded part 3, and the distance between the edge of the embedded part 3 and the edge of the opening 2.

[0054] See Figure 1 The dimension b of the first tie rod 5 along the first direction is the dimension of the opening 2 along the first direction, and the dimension h of the second tie rod 6 along the second direction is the sum of the dimension of the opening 2 along the second direction, half of the dimension of the embedded part 3 along the second direction, and the distance between the edge of the embedded part 3 along the second direction and the edge of the opening 2 along the second direction.

[0055] In some embodiments, when the embedded part 3 is positioned flush with the left and right ends of the opening 2, there is a certain distance between the embedded part 3 and the upper and lower ends of the opening 2. Therefore, the length b of the first tie rod 5 is the same as the width of the opening 2. Since the embedded part 3 has a certain width, the two ends of the second tie rod 6 are movably mounted on the positioning beam 4, and the positioning beam 4 is located in the middle of the embedded part 3. Therefore, the length h of the second tie rod 6 is the sum of the height of the opening 2, half the width of the embedded part 3, and the distance between the edge of the embedded part 3 and the edge of the opening 2.

[0056] See Figure 1 and Figure 3 The vertical distance 'a' between the interception net 8 and the wall 1 is 10cm-30cm.

[0057] In some embodiments, the vertical distance 'a' between the intercepting net 8 and the wall 1 is determined based on ventilation requirements and the impact energy of different types of projectiles. When the building is located in a mountain and natural disasters such as rockfalls frequently occur nearby, the vertical distance 'a' between the intercepting net 8 and the wall 1 is appropriately increased. When the projectiles are small, the vertical distance 'a' between the intercepting net 8 and the wall 1 is appropriately decreased.

[0058] See Figures 1-2 The suspension component 7 is made of alloy material.

[0059] In some embodiments, the suspension member 7 and the positioning beam 4 on the interception net 8 are designed to take into account the tensile force generated on the suspension member 7 when a projectile impacts the interception net 8. The suspension member 7 needs to be able to withstand the relevant loads, therefore the suspension member 7 is made of a high-strength alloy material. Since the suspension member 7 is connected to the wall 1 through the positioning beam 4, the positioning beam 4 needs to bear the force transmitted by the suspension member 7.

[0060] When the projectile impacts the object, the suspension component 7 on the upper first tie rod 5 bears a downward pulling force, the suspension component 7 on the lower first tie rod 5 bears an upward pulling force, and the suspension component 7 on the second tie rod 6 bears a pulling force that moves towards the center.

[0061] See Figure 4 The suspension component 7 includes a positioning rod 10, a first locking clamp 11, and a threaded ring 15;

[0062] The positioning rod 10 is movably mounted on the first pull rod 5 and the second pull rod 6. The first locking clamp 11 is located at the end of the positioning rod 10 near the intercepting net 8. A second locking clamp 12 is rotatably mounted on the first locking clamp 11. A locking arm 13 is provided at the end of the second locking clamp 12 away from the intercepting net 8. A recess 14 for receiving the locking arm 13 is provided on the positioning rod 10. A threaded ring 15 is threadedly mounted on the positioning rod 10 and is used to fix the locking arm 13.

[0063] The positioning rod 10 and the locking arm 13 located in the recess 14 are both inserted into the threaded ring 15 and are threadedly connected to the inner wall of the threaded ring 15. The threaded ring 15 can move axially relative to the positioning rod.

[0064] In some embodiments, when impacted by a projectile, the intercepting net 8 will indent inward, at which point the suspension member 7 will be pulled towards the opening 2 by the intercepting net 8. To prevent the intercepting net 8 from accidentally falling off the suspension member 7, a first locking clamp 11 and a second locking clamp 12 structure are designed. In use, firstly, the edge of the intercepting net 8 is hooked onto the first locking clamp 11, then the second locking clamp 12 is flipped over so that the locking arm 13 falls into the recess 14, and then the threaded ring 15 is rotated to fix the locking arm 13 to the positioning rod 10 through the threaded ring 15.

[0065] See Figures 1-2 The mesh density of the intercepting net 8 at the end away from the direction of gravity is greater than the mesh density at the end facing the direction of gravity.

[0066] In some embodiments, the interception net 8 is primarily subjected to impacts from drones and falling rocks, with falling rocks mainly impacting the interception net 8 from above at an angle downwards, while the impact force of drones is less than that of falling rocks. To improve the strength of the interception net 8 and prevent accidental breakage, the mesh density at the upper end of the interception net 8 is relatively high.

[0067] See Figures 1-2 The intercepting net 8 is set at an angle, and the vertical distance 'a' between the intercepting net 8 and the wall 1 gradually decreases along the direction of gravity.

[0068] In some embodiments, when a projectile impacts the interception net 8, it will slide downwards along the net 8 under the influence of gravity. To prevent the projectile from accidentally getting stuck on the net 8, it is designed to slope downwards.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A hole-blocking net device for nuclear power plants to prevent projectiles, used in a wall (1), wherein the wall (1) has an opening (2), characterized in that: The nuclear power plant's shielding net device for intercepting projectiles includes multiple embedded parts (3) pre-embedded in the wall (1); The outer wall of the embedded part (3) is provided with positioning beams (4), at least a portion of the positioning beams (4) are arranged at intervals along a first direction, and a first tie rod (5) is detachably installed on two adjacent positioning beams (4) along the first direction; at least a portion of the positioning beams (4) are arranged at intervals along a second direction, and a second tie rod (6) is detachably installed on two adjacent positioning beams (4) along the second direction, and the first direction and the second direction intersect; Multiple suspension components (7) are movably installed at intervals on the first tie rod (5) and the second tie rod (6). An interception net (8) is detachably connected to the suspension component (7). The interception net (8) is installed between the first tie rod (5) and the second tie rod (6) through the suspension component (7). The interception net (8) is set opposite to the opening. The suspension component (7) includes a positioning rod (10), a first locking clamp (11), and a threaded ring (15). The positioning rod (10) is movably mounted on the first pull rod (5) and the second pull rod (6). The first locking clamp (11) is located at one end of the positioning rod (10) near the intercepting net (8). A second locking clamp (12) is rotatably mounted on the first locking clamp (11). A locking arm (13) is provided at one end of the second locking clamp (12) away from the intercepting net (8). A recess (14) for receiving the locking arm (13) is provided on the positioning rod (10). The threaded ring (15) is threadedly mounted on the positioning rod (10) and is used to fix the locking arm (13). The positioning rod (10) and the locking arm (13) located in the recess (14) are both inserted into the threaded ring (15) and are threaded to the inner wall of the threaded ring (15). The threaded ring (15) can move axially relative to the positioning rod.

2. The nuclear power plant portal interception net device for defending against projectiles according to claim 1, characterized in that, The first pull rod (5) is composed of multiple first sub-pull rods (501), and the second pull rod (6) is composed of multiple vertical sub-rods (601).

3. The nuclear power plant portal interception net device for defending against projectiles according to claim 1 or 2, characterized in that, The intercepting net (8) is provided with rain and snow protection film (9) on both sides of the horizontal direction and on the side of the intercepting net (8) away from the direction of gravity. The positioning beam (4) also has pre-drilled holes and slots for fixing the rainproof and snowproof film (9).

4. The nuclear power plant portal interception net device for defending against projectiles according to claim 3, characterized in that, The rainproof and snowproof film (9) is made of at least one of the following materials: PVC waterproof film and polyethylene woven fabric.

5. The nuclear power plant portal interception net device for defending against projectiles according to claim 1 or 2, characterized in that, The dimension b of the first tie rod (5) along the first direction is the sum of the dimension of the opening (2) along the first direction, half of the dimension of the embedded part (3) along the first direction, and the distance between the edge of the embedded part (3) and the edge of the opening (2) along the first direction. The dimension h of the second tie rod (6) along the second direction is the dimension of the opening (2) along the second direction.

6. The nuclear power plant portal interception net device for defending against projectiles according to claim 1 or 2, characterized in that, The dimension b of the first tie rod (5) along the first direction is the dimension of the opening (2) along the first direction, and the dimension h of the second tie rod (6) along the second direction is the sum of the dimension of the opening (2) along the second direction, half of the dimension of the embedded part (3) along the second direction, and the distance between the edge of the embedded part (3) along the second direction and the edge of the opening (2) along the second direction.

7. The nuclear power plant portal interception net device for defending against projectiles according to claim 1 or 2, characterized in that, The vertical distance a between the interception net (8) and the wall (1) is 10cm-30cm; And / or, the embedded part (3) is embedded in the reinforced concrete structure of the wall (1) using anchor bars; And / or, the first tie rod (5), the second tie rod (6) and the positioning beam (4) are all connected by bolts for detachment; And / or, the suspension element (7) is made of alloy material.

8. The nuclear power plant portal interception net device for defending against projectiles according to claim 1 or 2, characterized in that, The mesh density of the intercepting net (8) at the end away from the direction of gravity is greater than the mesh density at the end facing the direction of gravity.

9. The nuclear power plant portal interception net device for defending against projectiles according to claim 1 or 2, characterized in that, The intercepting net (8) is set at an angle, and the vertical distance a between the intercepting net (8) and the wall (1) gradually decreases along the direction of gravity.

10. A method for installing a nuclear power plant's portal shielding net against projectiles according to any one of claims 1-9, characterized in that, The installation method includes: The embedded part (3) is pre-cast into the wall (1); A positioning beam (4) is fixedly installed on the outer wall of the embedded part (3), and then the first tie rod (5) and the second tie rod (6) are fixed to the positioning beam (4); Multiple sets of suspension components (7) are installed at intervals on the first tie rod (5) and the second tie rod (6); The intercepting net (8) is installed between the first tie rod (5) and the second tie rod (6) via a suspension member (7).

11. The method for installing the interception net at the entrance of a nuclear power plant to defend against projectiles according to claim 10, characterized in that, Hang the edge of the interception net (8) onto the first locking clamp (11), and fix the locking arm (13) onto the positioning rod (10) by means of the threaded ring (15).

Images