Anti-seismic prefabricated stair applied to nuclear power plant

Abstract

The utility model discloses an anti-seismic prefabricated stair applied to a nuclear power plant. The anti-seismic prefabricated stair comprises a stair body, an upper platform and a lower platform, the upper platform is connected to an upper stair beam, the lower platform is connected to a lower stair beam, an elastic support is arranged at the bottom of the upper platform and extends out of the bottom face of the upper platform, at least two rolling shafts are transversely arranged at the bottom of the lower platform, and grooves corresponding to the rolling shafts are formed in the lower stair beam. Elastic extrusion plates are arranged at the connecting position of the upper platform and the upper stair beam and the connecting position of the lower platform and the lower stair beam, the stair body is composed of a plurality of step sections, acute-angle containing cavities are formed in the turning positions of the adjacent step sections, and anti-shearing assemblies are arranged in the containing cavities. According to the stair, impact and vibration caused by an earthquake can be effectively reduced, and the stability and safety of the stair in the earthquake are improved; in addition, shear force generated by earthquakes can be absorbed and dispersed, the earthquake force borne by the staircase is reduced, and the risk that the staircase structure is damaged and collapses is reduced.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated staircase technology, and in particular to a seismic-resistant prefabricated staircase for use in nuclear power plants. Background Technology

[0002] In modern architectural design, staircases, as crucial transportation hubs connecting different floors, not only fulfill the basic function of ensuring safe passage for people, but also face higher demands in terms of structural safety, construction efficiency, and material performance as building heights continue to increase. With high-rise and super high-rise buildings becoming the mainstream trend in urban development, how to optimize construction processes and shorten construction cycles while ensuring the structural safety and reliability of staircases has become a critical issue that the construction industry urgently needs to address.

[0003] Currently, the most common types of staircases on the market include wooden staircases, steel staircases, and cast-in-place concrete staircases. Wooden staircases are favored for their natural beauty and ease of construction; however, their insufficient fire resistance severely limits their application in buildings with high safety requirements. Steel staircases, on the other hand, are widely used in many rapid construction projects due to their lightweight, high strength, and fast construction speed; however, steel structures have poor sound insulation, making them unsuitable for locations with strict acoustic requirements. Cast-in-place concrete staircases, with their excellent overall rigidity, good sound insulation, and strong seismic performance, are particularly suitable for buildings with special needs and high seismic resistance levels, such as critical facilities like nuclear power plants. However, the construction process of cast-in-place concrete staircases involves complex formwork support and a large amount of wet work, which not only increases construction costs but also extends the construction period.

[0004] Given the advantages and limitations of cast-in-place concrete staircases, precast staircases have gradually gained attention in the industry as an innovative solution. Precast staircases, produced in factories, can effectively improve production efficiency and quality control, reduce on-site wet work, and shorten construction cycles, making them particularly suitable for projects with strict time constraints. Especially in fields with extremely high seismic performance requirements, such as nuclear power plants, the application potential of precast staircases is enormous. However, traditional precast staircase designs often face the challenge of insufficient strength in the stair slabs. In extreme vibration situations such as earthquakes, because the reinforcement inside the precast stair slabs is mostly rigidly connected to the floor slab, its shear resistance and recovery capacity are relatively weak, which may lead to internal damage to the staircase structure and affect overall safety performance.

[0005] Therefore, developing a prefabricated staircase structure that can maintain the advantages of high construction efficiency and stable quality control while significantly improving the strength of stair slabs and enhancing seismic performance has become a pressing technical challenge in the current construction field. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a seismic-resistant prefabricated staircase for use in nuclear power plants.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] This utility model embodiment provides a seismic-resistant prefabricated staircase for use in nuclear power plants, comprising: a staircase body, an upper platform, and a lower platform. The upper platform and the lower platform are respectively connected to the top and bottom of the staircase body. The upper platform is connected to an upper ladder beam, and the lower platform is connected to a lower ladder beam. An elastic support is provided at the bottom of the upper platform, the elastic support is embedded in the upper platform, and the elastic support extends out of the bottom surface of the upper platform. The upper ladder beam has an upper mounting groove corresponding to the elastic support. At least two rollers are arranged laterally at the bottom of the lower platform, and the lower ladder beam has a groove corresponding to the rollers. Elastic compression plates are provided at the connection between the upper platform and the upper ladder beam, and at the connection between the lower platform and the lower ladder beam. The staircase body is composed of several stages, and an acute-angle receiving cavity is opened at the turning point of adjacent stages. An anti-shear component is provided in the receiving cavity.

[0009] In one specific embodiment, the shear-resistant component includes an L-shaped spring steel plate and a tensile reinforcement. One end of the L-shaped spring steel plate is connected to one of the platform stages, and the other end is connected to the other platform stage. The tensile reinforcement is connected to the bend of the L-shaped spring steel plate and is also connected to the reinforcement component inside the staircase body.

[0010] In one specific embodiment, a reinforcing plate abuts against the outer side of the L-shaped spring steel plate, and a fixing screw passes through the L-shaped spring steel plate and the reinforcing plate.

[0011] In one specific embodiment, the two ends of the L-shaped spring steel plate are provided with limiting ribs, which are connected to the reinforcement assembly inside the staircase body.

[0012] In one specific embodiment, the side of the staircase body used to connect to the wall is also provided with a step frame, and a shock-absorbing column extends outward from the side of the step near the step frame. The step frame is provided with an opening corresponding to the shock-absorbing column, and the shock-absorbing column is also fitted with a shock-absorbing spring.

[0013] In one specific embodiment, the reinforcement assembly includes transverse reinforcement bars, lower longitudinal reinforcement bars, and upper longitudinal reinforcement bars. The transverse reinforcement bars are tied to the lower longitudinal reinforcement bars, and adjacent transverse reinforcement bars are connected by fixing bars. The upper longitudinal reinforcement bars are respectively connected to two adjacent transverse reinforcement bars by fixing bars to form a triangular connection state.

[0014] In one specific embodiment, the reinforcement assembly includes lower longitudinal reinforcement, upper longitudinal reinforcement, lower transverse reinforcement and upper transverse reinforcement. The lower longitudinal reinforcement is tied to the lower transverse reinforcement, the upper longitudinal reinforcement is tied to the upper transverse reinforcement, adjacent lower transverse reinforcements are connected by fixing bars, and the upper transverse reinforcements are respectively connected to two adjacent lower transverse reinforcements by fixing bars to form a triangular connection.

[0015] In one specific embodiment, the elastic compression plate is further provided with a compression spring at one end near the upper or lower ladder beam, and the upper or lower ladder beam is provided with a limiting post corresponding to the compression spring.

[0016] In one specific embodiment, a protective block is connected at the corner of the platform stage, and the inner walls on both sides of the protective block are connected by multiple reinforcing ribs; the multiple reinforcing ribs are arranged at equal intervals, and a transverse connecting rod is connected between adjacent reinforcing ribs.

[0017] In one specific embodiment, the elastic support includes a fixed end and an overlapping end, the fixed end and the overlapping end are fixedly connected, the fixed end is embedded in the upper platform, the overlapping end extends out of the bottom surface of the upper platform, the fixed end is inverted, and the bottom surface of the overlapping end is also provided with a corrugated layer.

[0018] Compared with the prior art, the advantages of this utility model are as follows: by adopting designs such as elastic supports, rollers, and elastic compression plates, the impact and vibration caused by earthquakes can be effectively reduced, improving the stability and safety of the staircase during earthquakes; in addition, by setting up a receiving cavity and anti-shear components, the shear force generated by earthquakes can be absorbed and dispersed, reducing the seismic force borne by the staircase, thereby reducing the risk of structural damage and collapse of the staircase and playing a role in earthquake prevention and disaster reduction; furthermore, by adopting a prefabricated structure design, through factory production and quality control, the consistency and reliability of the staircase structure are ensured, improving the overall structural stability and safety of the building.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A three-dimensional schematic diagram of a seismic-resistant prefabricated staircase for use in nuclear power plants, provided by this utility model;

[0022] Figure 2 A schematic diagram of the structure of the shear-resistant component provided by this utility model;

[0023] Figure 3 A schematic diagram of the structure connecting the platform and step frame provided by this utility model;

[0024] Figure 4 A schematic diagram of a structure of an embodiment of the reinforcement assembly provided by this utility model;

[0025] Figure 5 A schematic diagram of another embodiment of the reinforcement assembly provided by this utility model;

[0026] Figure 6 A schematic diagram of the structure of the elastic extrusion plate provided by this utility model;

[0027] Figure 7 A schematic diagram of the structure of the protective block provided by this utility model;

[0028] Figure 8 A schematic diagram of the structure of the elastic support provided by this utility model.

[0029] Figure label:

[0030] Staircase body 10, landing 11, shock-absorbing column 111, shock-absorbing spring 112, receiving cavity 12, shear-resistant component 13, L-shaped spring steel plate 131, tensile reinforcement 132, reinforcing plate 133, fixing screw 134, limiting reinforcement 135, reinforcement component 14, transverse reinforcement 141, lower longitudinal reinforcement 142, upper longitudinal reinforcement 143, fixing reinforcement 144, lower transverse reinforcement 145, upper transverse reinforcement 146, step frame 15, protective block 16, reinforcing reinforcement 161, transverse connecting rod 162, upper platform 20, lower platform 30, upper ladder beam 40, lower ladder beam 50, elastic support 60, fixed end 61, lap end 62, roller 70, elastic compression plate 80, compression spring 81. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0034] Furthermore, the terms "first" and "second" are used 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 as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0038] See Figures 1 to 8 As shown, this utility model discloses a specific embodiment of a seismic-resistant prefabricated staircase applied in a nuclear power plant, comprising: a staircase body 10, an upper platform 20, and a lower platform 30. The upper platform 20 and the lower platform 30 are respectively connected to the top and bottom of the staircase body 10. The upper platform 20 is connected to an upper ladder beam 40, and the lower platform 30 is connected to a lower ladder beam 50. An elastic support 60 is provided at the bottom of the upper platform 20, the elastic support 60 is embedded in the upper platform 20, and the elastic support 60 extends out of the bottom surface of the upper platform 20. The upper ladder beam 40 is provided with an upper mounting groove corresponding to the elastic support 60. At least two rollers 70 are arranged laterally at the bottom of the lower platform 30. The lower ladder beam 50 is provided with a groove corresponding to the rollers 70. Elastic compression plates 80 are provided at the connection between the upper platform 20 and the upper ladder beam 40 and at the connection between the lower platform 30 and the lower ladder beam 50. The stair body 10 is composed of several steps 11. An acute-angle receiving cavity 12 is opened at the turning point of adjacent steps 11. An anti-shear component 13 is provided in the receiving cavity 12.

[0039] Specifically, the elastic support 60 is made of a highly elastic polymer material. The groove is arc-shaped to fit the roller 70. The receiving cavity 12 is filled with an elastic filler, such as polyethylene foam, polyurethane foam, or asphalt.

[0040] This earthquake-resistant prefabricated staircase, applied to nuclear power plants, utilizes an elastic support 60 embedded in the bottom of the upper platform 20 to ensure its stability. This design absorbs and disperses the vertical and horizontal impact forces generated during earthquakes, effectively mitigating the impact of vibrations on the upper platform 20 and the staircase body 10, and improving the overall structural toughness. Furthermore, the rollers 70 at the bottom of the lower platform 30 match the grooves on the lower stair beam 50, allowing for a certain degree of horizontal displacement under seismic action, further reducing the direct transmission of seismic energy to the staircase structure and enhancing its overturning resistance. Elastic compression plates 80 are added at the connections between the upper platform 20, lower platform 30, and corresponding stair beams, enhancing the tightness and stability of the connections and providing a buffering effect during earthquakes, preventing loosening or damage to the connections due to vibration. Additionally, by creating a sharp-angle receiving cavity 12 at the turning point of the platform 11 of the staircase body 10 and incorporating an anti-shear component 13, this innovative design efficiently absorbs and disperses the shear forces generated by earthquakes, significantly reducing the risk of structural damage due to shear forces and ensuring the continuity and functionality of the staircase during earthquakes. Furthermore, the prefabricated structure design allows for the precise manufacturing and rigorous quality control of each staircase component in the factory. This ensures consistency in structural dimensions, material properties, and assembly precision for every staircase set, thereby improving the overall structural stability and reliability. Simultaneously, the prefabricated staircase components facilitate rapid on-site installation, reducing construction time and costs, while also aiding in later maintenance and replacement, thus enhancing the operational efficiency of nuclear power plant facilities.

[0041] See Figure 2 As shown, in one embodiment, the shear-resistant component 13 includes an L-shaped spring steel plate 131 and a tensile reinforcement 132. One end of the L-shaped spring steel plate 131 is connected to one of the platform stages 11, and the other end is connected to the other platform stage 11. The tensile reinforcement 132 is connected to the bend of the L-shaped spring steel plate 131, and the tensile reinforcement 132 is also connected to the reinforcement component 14 inside the stair body 10.

[0042] Specifically, the cross-step connection structure of the L-shaped spring steel plate 131 can effectively absorb and disperse the shear force generated during an earthquake, reducing the risk of damage to the staircase structure due to shear forces. Furthermore, the spring properties of the L-shaped spring steel plate 131 give the staircase structure a certain degree of elastic recovery capability during an earthquake, helping to maintain the integrity and stability of the staircase. The addition of the tensile reinforcement 132 enhances the connection strength between the L-shaped spring steel plate 131 and the internal reinforcement components 14 of the staircase body 10, enabling the staircase structure to form a more stable whole during an earthquake. Through the tensile support of the tensile reinforcement 132, the deformation and displacement of the staircase structure under seismic loading are further controlled, improving the seismic performance of the staircase.

[0043] See Figure 2As shown, in one embodiment, the outer side of the L-shaped spring steel plate 131 abuts against a reinforcing plate 133, and a fixing screw 134 passes through the L-shaped spring steel plate 131 and the reinforcing plate 133.

[0044] Specifically, the tensile reinforcement 132 is arranged horizontally. One side of the tensile reinforcement 132 is welded to the bend of the L-shaped spring steel plate 131, which can effectively increase the bending resistance of the stair structure under bending force, thereby improving the load-bearing capacity and stability of the stair structure. The other side is welded to the reinforcement component 14 inside the stair body 10, which can ensure the firmness and stability of the connection, thereby improving the connection strength of the entire stair structure and reducing the risk of material fatigue and fracture. In addition, the welding of the tensile reinforcement 132 also helps to distribute the externally applied load to more structural components, reduce local stress concentration, and improve the overall load-bearing capacity of the structure.

[0045] Specifically, the combination of the L-shaped spring steel plate 131 and the reinforcing plate 133 can improve the stiffness and stability of the entire structure. The reinforcing plate 133, through its contact with the L-shaped spring steel plate 131, increases its lateral stiffness, making the structure more evenly stressed and reducing deformation and vibration. Furthermore, the connection between the reinforcing plate 133 and the L-shaped spring steel plate 131 is achieved through the fixing bolt 134, which disperses the externally applied load throughout the structure, effectively reducing local stress concentration and improving the structure's load-bearing capacity and durability. Additionally, with the reinforcing plate 133 abutting against the outer side of the L-shaped spring steel plate 131, the reinforcing plate 133 provides shear resistance. Under external impact forces such as earthquakes, the reinforcing plate 133 can withstand some shear force, reducing the stress on the L-shaped spring steel plate 131 and improving the overall shear resistance of the structure. Preferably, the reinforcing plate 133 is a steel plate.

[0046] See Figure 2 As shown, in one embodiment, the L-shaped spring steel plate 131 is provided with limiting ribs 135 at both ends, and the limiting ribs 135 are connected to the reinforcement assembly 14 inside the stair body 10.

[0047] Specifically, the limiting rib 135 prevents the L-shaped spring steel plate 131 from moving laterally or tilting when subjected to lateral forces, thus maintaining the stability of the L-shaped spring steel plate 131 and ensuring the overall stability of the staircase structure. Furthermore, by connecting the limiting rib 135 to the reinforcement assembly 14 inside the staircase body 10, external loads can be effectively distributed throughout the entire staircase structure, thereby improving the load-bearing capacity and stability of the staircase. Additionally, the limiting rib 135 can reduce vibration and deformation of the staircase structure when subjected to external impacts, thereby improving the safety and stability of the overall structure. Preferably, the limiting rib 135 is arranged laterally and welded to the L-shaped spring steel plate 131 and the reinforcement assembly 14.

[0048] See Figure 1 and Figure 3 As shown, in one embodiment, the side of the staircase body 10 used to connect to the wall is also provided with a step frame 15, and the step 11 extends outward from the side of the step frame 15 with a shock-absorbing column 111. The step frame 15 is provided with an opening corresponding to the shock-absorbing column 111, and the shock-absorbing column 111 is also fitted with a shock-absorbing spring 112.

[0049] Specifically, by setting up shock-absorbing columns 111 and shock-absorbing springs 112, and cooperating with openings, the impact and vibration generated during stair use can be effectively absorbed. This reduces stair noise and interference with the surrounding environment, and provides a more comfortable user experience. In addition, the design of the shock-absorbing columns 111 can increase the stability of the staircase and reduce swaying and deformation during use, which is very important for ensuring the safety of users when going up and down the stairs. Furthermore, the use of shock-absorbing columns 111 and shock-absorbing springs 112 can mitigate the impact of external impact on the staircase and users, thereby improving the safety of the staircase. They can absorb part of the impact force to reduce the risk of slipping and falling.

[0050] See Figure 4 As shown, in one embodiment, the reinforcement assembly 14 includes transverse steel bars 141, lower longitudinal steel bars 142 and upper longitudinal steel bars 143. The transverse steel bars 141 are tied to the lower longitudinal steel bars 142. Adjacent transverse steel bars 141 are connected by fixing bars 144. The upper longitudinal steel bars 143 are respectively connected to two adjacent transverse steel bars 141 by fixing bars 144 to form a triangular connection.

[0051] Specifically, the number of transverse reinforcing bars 141, lower longitudinal reinforcing bars 142, and upper longitudinal reinforcing bars 143 are all several. The transverse reinforcing bars 141 are tied to the lower longitudinal reinforcing bars 142, and adjacent transverse reinforcing bars 141 are connected by fixing bars 144. The upper longitudinal reinforcing bars 143 are connected to adjacent transverse reinforcing bars 141 by fixing bars 144, forming a triangular connection. This structural design increases the overall strength and stiffness of the concrete structure, improves its load-bearing capacity, and enables it to better withstand loads. Furthermore, the triangular connection effectively improves the seismic performance of the concrete structure. During an earthquake, this design increases the seismic stability of the structure, reduces deformation and damage, and thus protects the safety of buildings and people. Additionally, through the connection of fixing bars 144, the reinforcement assembly 14 forms a stable triangular structure. This structural design increases the overall stability of the concrete structure and reduces deformation and displacement during use. Moreover, this reinforcement structure design simplifies the construction process and improves construction efficiency. The connection of adjacent transverse reinforcing bars 141 and upper longitudinal reinforcing bars 143 by fixing bars 144 makes the construction process more convenient and faster. Preferably, the fixing bar 144 is welded to the transverse bar 141 or the upper longitudinal bar 143.

[0052] See Figure 5 As shown, in one embodiment, the reinforcement assembly 14 includes a lower longitudinal steel bar 142, an upper longitudinal steel bar 143, a lower transverse steel bar 145, and an upper transverse steel bar 146. The lower longitudinal steel bar 142 is tied to the lower transverse steel bar 145, and the upper longitudinal steel bar 143 is tied to the upper transverse steel bar 146. Adjacent lower transverse steel bars 145 are connected by fixing bars 144, and the upper transverse steel bars 146 are respectively connected to two adjacent lower transverse steel bars 145 by fixing bars 144 to form a triangular connection.

[0053] Specifically, the number of lower longitudinal steel bars 142, upper longitudinal steel bars 143, lower transverse steel bars 145, and upper transverse steel bars 146 are all several. By binding the lower longitudinal reinforcement 142 with the lower transverse reinforcement 145, and binding the upper longitudinal reinforcement 143 with the upper transverse reinforcement 146, and connecting adjacent lower transverse reinforcement 145 with fixing bars 144, and connecting two adjacent lower transverse reinforcement 145 with fixing bars 144, a triangular connection is formed. This structural design can increase the overall strength and stiffness of the concrete structure, improve its load-bearing capacity, and enable it to better withstand loads. In addition, the triangular connection can effectively improve the seismic performance of the concrete structure. During an earthquake, this design can increase the seismic stability of the structure, reduce structural deformation and damage, and thus protect the safety of buildings and people. Furthermore, through the connection of fixing bars 144, the reinforcement assembly 14 forms a stable triangular structure. This structural design can increase the overall stability of the concrete structure and reduce deformation and displacement during use. In addition, this reinforcement structure design can simplify the construction process and improve construction efficiency. The connection of adjacent lower transverse reinforcement 145 and upper transverse reinforcement 146 with fixing bars 144 makes the construction process more convenient and faster. In addition, adjacent upper transverse reinforcing bars 146 can also be connected by fixing bars 144 to form an inverted triangular connection structure with opposite directions and staggered distribution. Preferably, the fixing bars 144 are welded to the lower transverse reinforcing bars 145 or the upper transverse reinforcing bars 146.

[0054] Specifically, the horizontal reinforcing bar 141, the lower horizontal reinforcing bar 145, or the upper horizontal reinforcing bar 146 all extend out of the step frame 15 to connect to the wall.

[0055] See Figure 1 and Figure 6 As shown, in one embodiment, the elastic compression plate 80 is further provided with a compression spring 81 at one end near the upper ladder beam 40 or the lower ladder beam 50, and the upper ladder beam 40 or the lower ladder beam 50 is provided with a limiting post corresponding to the compression spring 81.

[0056] Specifically, the elastic compression plate 80 and compression spring 81 can reduce the vibration and impact of the staircase structure under earthquakes or other external forces. When an earthquake or external force is transmitted to the staircase structure, the elastic compression plate 80 can absorb some of the energy, and the compression spring 81 can achieve shock absorption and buffering effects, thereby reducing the stress and deformation of the staircase structure. In addition, under earthquakes or other external forces, the staircase structure is prone to displacement and deformation. By setting the elastic compression plate 80 and compression spring 81, the displacement range of the staircase structure can be effectively limited, improving its overall stability. At the same time, the setting of the limiting column can control the movement range of the elastic compression plate 80, further increasing the stability of the structure. Furthermore, the vibration and impact of the staircase structure can be transmitted to adjacent floors or the ground, generating noise and vibration effects. By using the elastic compression plate 80 and compression spring 81, the transmission of vibration and impact of the staircase structure can be reduced, reducing the impact of noise and vibration on the surrounding environment and users.

[0057] See Figure 7 As shown, in one embodiment, a protective block 16 is connected at the corner of the platform stage 11, and the inner walls on both sides of the protective block 16 are connected by a plurality of reinforcing ribs 161; the plurality of reinforcing ribs 161 are arranged at equal intervals, and a transverse connecting rod 162 is also connected between adjacent reinforcing ribs 161.

[0058] Specifically, at the corner of stage 11, stress concentration and fatigue failure are prone to occur due to concentrated stress. By setting up protective blocks 16 and reinforcing ribs 161, the structure at the corner can be effectively strengthened, improving its load-bearing capacity and durability. Furthermore, by arranging multiple reinforcing ribs 161 at equal intervals and connecting them with transverse connecting rods 162, stress can be distributed throughout the entire structure, avoiding stress concentration and reducing the risk of structural cracking or failure. Additionally, the connection between the inner walls of the two sides of the protective blocks 16 through multiple reinforcing ribs 161 increases the stiffness at the corner, improving the stability of the staircase structure. This connection method has good load-bearing capacity and seismic performance, effectively enhancing the stability and safety of the staircase structure. Preferably, the protective blocks 16 are made of steel plate.

[0059] In one embodiment, the roller 70 is a threaded steel bar, and the depth of the groove is equal to the radius of the threaded steel bar.

[0060] Specifically, the roller 70 connects the lower platform 30 and the lower ladder beam 50 by engaging with the groove of the lower ladder beam 50. The design of the threaded steel provides good friction and gripping force, making the connection more secure and enhancing the stability of the overall structure. In addition, during an earthquake, the staircase structure will be subjected to seismic forces. By setting the threaded steel and groove connection, the structure's shock absorption and energy absorption capacity can be increased. The movement and deformation of the threaded steel can absorb and disperse seismic forces, protecting the staircase structure from excessive vibration.

[0061] See Figure 8 As shown, in one embodiment, the elastic support 60 includes a fixed end 61 and an overlapping end 62. The fixed end 61 and the overlapping end 62 are fixedly connected. The fixed end 61 is embedded in the upper platform 20, and the overlapping end 62 extends out of the bottom surface of the upper platform 20. The fixed end 61 is inverted, and the bottom surface of the overlapping end 62 is also provided with a corrugated layer.

[0062] Specifically, the staircase body 10, upper platform 20, lower platform 30, and elastic support 60 are integrally cast. The design of the elastic support 60 provides elastic support when the staircase structure is subjected to vibration or seismic forces, allowing the staircase structure to make corresponding displacements and deformations, thereby reducing the impact of earthquakes or vibrations on the structure and increasing its stability and safety. Furthermore, the inverted design of the fixed end 61 ensures that the elastic support 60 is firmly fixed within the upper platform 20, and the overlapping end 62 ensures a stable connection with the upper platform 20, thus guaranteeing the reliability and stability of the elastic support 60 in the staircase structure. The corrugated layer design provides a certain buffering and shock absorption effect; when the staircase structure is subjected to impact or vibration, the corrugated layer can absorb some energy, reducing the impact of the impact on the structure and protecting the staircase structure from damage. In addition, the elastic support 60 can also overcome the adverse effects of uneven structural surfaces.

[0063] In one embodiment, a connecting buffer layer is provided at the bottom of the stair body 10. The connecting buffer layer is made of some materials (such as rubber, foam, etc.). These materials have good shock absorption and sound absorption properties, which can effectively reduce the vibration and noise generated during the use of the stair and improve the comfort of using the stair.

[0064] In one embodiment, the staircase body 10 is provided with a lifting hole, and a lifting bolt is provided in the lifting hole. The lifting hole and the lifting bolt facilitate the lifting and installation of the staircase. During manufacturing, transportation and on-site installation, the staircase can be lifted using lifting equipment, and the lifting bolt can serve as a fixing point to ensure the stability and safety of the staircase during the lifting process. In addition, the design of the lifting hole and the lifting bolt facilitates future maintenance and replacement of the staircase. If the staircase needs to be repaired or replaced, it can be disassembled and installed using the lifting hole and the lifting bolt, which improves the convenience of maintenance.

[0065] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A seismic-resistant prefabricated staircase for use in nuclear power plants, comprising: The staircase comprises a main body, an upper platform, and a lower platform. The upper platform and the lower platform are respectively connected to the top and bottom of the main body. The upper platform is connected to an upper ladder beam, and the lower platform is connected to a lower ladder beam. The staircase is characterized by: an elastic support at the bottom of the upper platform, the elastic support being embedded within the upper platform and extending beyond its bottom surface; an upper ladder beam having an upper mounting groove corresponding to the elastic support; at least two rollers laterally arranged at the bottom of the lower platform; a groove corresponding to the rollers on the lower ladder beam; elastic compression plates at the connections between the upper platform and the upper ladder beam, and between the lower platform and the lower ladder beam; the staircase is composed of several stages, with acute-angled receiving cavities formed at the turning points of adjacent stages, and shear-resistant components installed within these cavities.

2. The seismic-resistant prefabricated staircase for nuclear power plants according to claim 1, characterized in that, The shear-resistant component includes an L-shaped spring steel plate and a tensile reinforcement. One end of the L-shaped spring steel plate is connected to one of the platform stages, and the other end is connected to the other platform stage. The tensile reinforcement is connected to the bend of the L-shaped spring steel plate and is also connected to the reinforcement component inside the staircase body.

3. The seismic-resistant prefabricated staircase for nuclear power plants according to claim 2, characterized in that, The outer side of the L-shaped spring steel plate abuts against a reinforcing plate, and a fixing screw passes through the L-shaped spring steel plate and the reinforcing plate.

4. The seismic-resistant prefabricated staircase for nuclear power plants according to claim 3, characterized in that, The L-shaped spring steel plate is provided with limiting ribs at both ends, and the limiting ribs are connected to the reinforcement assembly inside the stair body.

5. The seismic-resistant prefabricated staircase for nuclear power plants according to claim 2, characterized in that, The staircase body is provided with a step frame on one side for connecting to the wall. A shock-absorbing column extends outward from the side of the step frame of the staircase. The step frame is provided with an opening corresponding to the shock-absorbing column. The shock-absorbing column is also fitted with a shock-absorbing spring.

6. The seismic-resistant prefabricated staircase for nuclear power plants according to claim 2, characterized in that, The reinforcement assembly includes transverse steel bars, lower longitudinal steel bars, and upper longitudinal steel bars. The transverse steel bars are tied to the lower longitudinal steel bars, and adjacent transverse steel bars are connected by fixing bars. The upper longitudinal steel bars are respectively connected to two adjacent transverse steel bars by fixing bars to form a triangular connection.

7. The seismic-resistant prefabricated staircase for nuclear power plants according to claim 2, characterized in that, The reinforcement assembly includes lower longitudinal reinforcement, upper longitudinal reinforcement, lower transverse reinforcement and upper transverse reinforcement. The lower longitudinal reinforcement is tied to the lower transverse reinforcement, the upper longitudinal reinforcement is tied to the upper transverse reinforcement, adjacent lower transverse reinforcements are connected by fixing bars, and the upper transverse reinforcements are respectively connected to two adjacent lower transverse reinforcements by fixing bars to form a triangular connection.

8. The seismic-resistant prefabricated staircase for nuclear power plants according to claim 2, characterized in that, The elastic compression plate is also provided with a compression spring at one end near the upper or lower ladder beam, and the upper or lower ladder beam is provided with a limiting post corresponding to the compression spring.

9. The seismic-resistant prefabricated staircase for nuclear power plants according to claim 2, characterized in that, A protective block is connected at the corner of the platform stage, and the inner walls of the two sides of the protective block are connected by multiple reinforcing ribs; the multiple reinforcing ribs are arranged at equal intervals, and a transverse connecting rod is connected between adjacent reinforcing ribs.

10. The seismic-resistant prefabricated staircase for nuclear power plants according to claim 2, characterized in that, The elastic support includes a fixed end and an overlapping end. The fixed end is fixedly connected to the overlapping end. The fixed end is embedded in the upper platform, and the overlapping end extends out of the bottom surface of the upper platform. The fixed end is inverted, and the bottom surface of the overlapping end is also provided with a corrugated layer.

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