High-rise stair sliding support device and construction method

Abstract

The invention discloses a high-rise stair sliding support device and a construction method, and relates to the technical field of stair construction. The stair comprises a structural beam floor slab and a stair body, the structural beam floor slab is provided with a containing groove, the stair body is provided with an end plate, a first groove is formed in the bottom of the inner wall of the containing groove, a second groove is formed in the bottom of the inner wall of the first groove, a vertical part is fixed to the end plate, and a transverse part is fixed to the bottom face of the vertical part and matched with the first groove. The vertical part and the transverse part are matched with the second groove to form a buffer block with the cross section of a T-shaped structure, a transverse buffer piece is arranged on the side face of the buffer block so that buffering can be conveniently formed in the horizontal direction of the end of the stair body, and a longitudinal buffer piece is arranged on the bottom side of the buffer block so that buffering can be conveniently formed in the vertical direction of the end of the stair body. The stair body can generate certain displacement in the horizontal direction and the vertical direction, and the situation that the stair is damaged before a main body structure in an earthquake, and the function of an escape channel cannot be achieved is effectively avoided.

Description

Technical Field

[0001] This invention belongs to the field of staircase construction technology, and in particular relates to a sliding support device and construction method for high-rise staircases. Background Technology

[0002] Staircases, as vertical transportation components between floors in a building, are usually erected between two floors to allow people to walk up and down. They are closely related to our lives, especially during earthquakes, when staircases play an even more important role as escape routes for evacuation. In buildings, because stairwells have relatively few longitudinal and transverse horizontal supports and bear high rigidity, they are usually the first to become unstable during earthquakes, eventually leading to structural failure. Since people need to escape through staircases during an earthquake, the structural safety of staircases is of paramount importance.

[0003] Currently, existing slab staircases are usually cast as a single piece with the building. The two ends of the slab staircase are rigidly connected to the upper and lower platforms of the building. As a result, in the event of an earthquake or other vibration, the building transmits the vibration from the two ends of the staircase to the staircase through the upper and lower platforms. This causes the staircase to be subjected to extremely high loads and thus become damaged. Consequently, the staircase often fails before the main structure in an earthquake and cannot serve as an escape route.

[0004] To address this issue, we designed a sliding support device and construction method for high-rise staircases. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a sliding support device for a high-rise staircase, comprising a structural beam floor slab and a staircase body. An end plate is fixedly provided at the end of the staircase body. A placement groove is provided on the structural beam floor slab. The end plate and the placement groove cooperate with each other. A first groove is formed at the bottom of the inner wall of the placement groove. A second groove is formed at the bottom of the inner wall of the first groove. A vertical part is fixedly provided on the bottom surface of the end plate. The vertical part is movably engaged with the first groove. A horizontal part is fixedly provided at the end of the vertical part away from the end plate. The horizontal part is placed in the second groove and is movably engaged with the second groove. An arched bottom elastic steel plate is provided on the lower side of the horizontal part. The vertical and horizontal portions form a buffer block with a T-shaped cross-section. The buffer block has a horizontal buffer member on its side and a vertical buffer member on its bottom side.

[0006] The transverse buffer includes a first elastic steel plate, a second elastic steel plate, a first elastic strip, and a second elastic strip. A plurality of the first elastic steel plates are disposed opposite each other on the left and right sides of the inner wall of the second groove, and a plurality of the second elastic steel plates are fixed opposite each other on the left and right sides of the transverse portion. Both the first elastic steel plate and the second elastic steel plate are arc-shaped structures, and adjacent first elastic steel plates and second elastic steel plates are staggered.

[0007] A plurality of first elastic strips are disposed opposite each other on both sides of the inner wall of the first groove, and a plurality of second elastic strips are disposed opposite each other on both sides of the vertical part. Both the first elastic strips and the second elastic strips are arc-shaped structures, and adjacent first elastic strips and second elastic strips are staggered.

[0008] The longitudinal buffer includes steel bars. Two movable grooves are opened opposite each other on the bottom side of the second groove. Several steel bars are fixed inside the movable grooves. Movable blocks are movably sleeved on the steel bars. Two adjacent movable blocks in the horizontal direction are fixedly connected to the two ends of the bottom elastic steel plate of the arch structure. A spring is sleeved on the outside of the steel bars. One end of the spring is fixedly connected to the movable block, and the other end of the spring cooperates with the inner wall of the movable groove.

[0009] Two polystyrene foam boards are arranged opposite each other on the top of the inner wall of the second groove, and the polystyrene foam boards cooperate with the top surface of the transverse part.

[0010] Polytetrafluoroethylene (PTFE) plates are provided on both the front and rear sides of the inner walls of the first and second grooves, and the PTFE plates respectively cooperate with the front and rear end faces of the vertical and horizontal portions.

[0011] The side face of the end plate is filled with silicone sealant between itself and the inner wall of the placement groove, and the top of the structural beam floor slab is bonded to the top of the end plate with a building surface layer.

[0012] A construction method comprising the following steps: S1. First, build a template, pour the horizontal part, and reserve grouting pipes on the horizontal part. At the same time, embed several second elastic steel plates into the two sides of the horizontal part. Meanwhile, pour the vertical part through the template, reserve grouting holes on the vertical part, and embed several second elastic strips into the two sides of the vertical part. S2. The lower part of the structural beam floor slab is poured in a segmented manner, so that the second groove and the movable groove are formed during the pouring process. The structural beam floor slab is made of fine stone concrete. The steel bars are stuck in the corresponding positions in the movable groove and the movable block is moved into the movable groove. At the same time, the first elastic steel plate is embedded in both sides of the inner wall of the second groove. S3. Place the hardened transverse part inside the second groove, and drive the second elastic steel plate to be inserted between two adjacent first elastic steel plates at corresponding positions. S4. Continue to build the formwork and pour the upper part of the structural beam floor slab, so that the pouring forms the first groove and the placement groove, and embed several first elastic strips into the inner wall of the first groove on both sides. After hardening, place the polystyrene foam board coated with structural adhesive into the gap between the top surface of the transverse part and the inner wall of the second groove, and make the side of the polystyrene foam board coated with structural adhesive adhere to the inner wall of the second groove. Then, attach multiple polytetrafluoroethylene boards to the front and back sides of the inner walls of the first and second grooves respectively. S5. Insert the vertical part into the first groove from top to bottom, so that the grouting pipe on the horizontal part is inserted into the hole on the vertical part, and the second elastic strips on both sides are inserted at intervals between the two adjacent first elastic strips at the corresponding positions. S6. Grouting is carried out through grouting pipes to fix the vertical and horizontal parts together. At the same time, the end plate is cast at the top of the vertical part and the stair body is constructed upward along the end plate.

[0013] The present invention has the following beneficial effects: This invention forms a corrugated buffer zone by staggering the first and second elastic steel plates and the first and second elastic strips. This buffers the sides of the vertical and horizontal sections in the horizontal direction. In addition, the cooperation of multiple polytetrafluoroethylene plates with the front and rear ends of the vertical and horizontal sections further buffers the front and rear sides of the horizontal and vertical sections. Combined with the end plates, it effectively buffers the ends of the staircase body in the horizontal direction, eliminates the impact of vibration, and allows the staircase body to move to a certain extent in the horizontal direction. Meanwhile, the bottom elastic steel plate of the arched structure, combined with the sliding cooperation of the movable block and the steel bar, and the elastic effect of the spring, effectively forms a buffer at the bottom of the horizontal part. At the same time, the cooperation between the polystyrene foam board and the top surface of the horizontal part further forms a buffer on the upper side of the horizontal part. Combined with the end plate, it effectively forms a buffer effect on the ends of the staircase in the vertical direction, eliminating the impact of vibration. This allows the staircase to move to a certain extent in the vertical direction. This solves the problem that existing slab staircases are usually cast as a whole with the building. The two ends of the slab staircase are rigidly connected to the upper and lower platforms of the building. As a result, when earthquakes or other vibrations occur, the building transmits the vibration from the two ends of the staircase to the staircase through the upper and lower platforms, causing the staircase to be under great load and thus damaged. As a result, the staircase often fails before the main structure in an earthquake and cannot serve as an escape route.

[0014] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the present invention; Figure 3 for Figure 2 Schematic diagram of the structure of the mid-section AA; Figure 4 for Figure 3 Schematic diagram of the structure of the mid-section BB; Figure 5 for Figure 3 Schematic diagram of the structure of the mid-section CC; Figure 6 for Figure 3 Enlarged structural diagram at point D; Figure 7 for Figure 3 Enlarged structural diagram at point E; Figure 8 for Figure 4 Enlarged structural diagram at point F; Figure 9 for Figure 5 A magnified structural diagram of point G in the middle.

[0017] The attached diagram lists the components represented by each number as follows: 1. Structural beam floor slab; 2. Staircase body; 3. End plate; 4. Placement groove; 5. First groove; 6. Second groove; 7. Vertical part; 8. Horizontal part; 9. First elastic steel plate; 10. Second elastic steel plate; 11. First elastic strip; 12. Second elastic strip; 13. Bottom elastic steel plate; 14. Movable groove; 15. Reinforcing bar; 16. Movable block; 17. Spring; 18. Polystyrene foam board; 19. Polytetrafluoroethylene board; 20. Building surface layer; 21. Silicone sealant. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "upper", "middle", "outer", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0020] Please see Figures 1-9 As shown, the present invention is a sliding support device for a high-rise staircase, including a structural beam floor slab 1 and a staircase body 2. An end plate 3 is fixedly provided at the end of the staircase body 2. A placement groove 4 is provided on the structural beam floor slab 1. The end plate 3 and the placement groove 4 cooperate with each other. A first groove 5 is provided at the bottom of the inner wall of the placement groove 4. A second groove 6 is provided at the bottom of the inner wall of the first groove 5. A vertical part 7 is fixedly provided on the bottom surface of the end plate 3. The vertical part 7 is movably cooperated with the first groove 5. A horizontal part 8 is fixed at the end of the vertical part 7 away from the end plate 3. The horizontal part 8 is placed in the second groove 6 and is movably cooperated with the second groove 6. An arched bottom elastic steel plate 13 is provided on the lower side of the horizontal part 8. The vertical part 7 and the horizontal part 8 form a buffer block with a T-shaped cross-section. The side of the buffer block is provided with a horizontal buffer member and the bottom of the buffer block is provided with a vertical buffer member. The horizontal buffer member facilitates the formation of a buffer in the horizontal direction at the end of the stair body 2, and the vertical buffer member facilitates the formation of a buffer in the vertical direction at the end of the stair body 2. This effectively improves the buffering effect of the stair body 2 on the vibration, allowing the stair body 2 to undergo a certain displacement in both the horizontal and vertical directions. This effectively prevents the staircase from being destroyed before the main structure during an earthquake and thus failing to function as an escape route.

[0021] The transverse buffer includes a first elastic steel plate 9, a second elastic steel plate 10, a first elastic strip 11, and a second elastic strip 12. Several first elastic steel plates 9 are arranged opposite each other on the left and right sides of the inner wall of the second groove 6, and several second elastic steel plates 10 are fixed opposite each other on the left and right sides of the transverse part 8. Both the first elastic steel plates 9 and the second elastic steel plates 10 are arc-shaped, and adjacent first elastic steel plates 9 and second elastic steel plates 10 are staggered. Several first elastic strips 11 are arranged opposite each other on the inner wall of the first groove 5, and several second elastic strips 12 are arranged opposite each other on the sides of the vertical part 7. Both the first elastic strips 11 and the second elastic strips 12 are arc-shaped, and adjacent first elastic strips 11 and second elastic strips 12 are staggered.

[0022] Polytetrafluoroethylene (PTFE) plates 19 are provided on both the front and rear sides of the inner walls of the first groove 5 and the second groove 6, and several PTFE plates 19 respectively cooperate with the front and rear end faces of the vertical part 7 and the horizontal part 8.

[0023] In the above structure, the first elastic steel plate 9 and the second elastic steel plate 10 are staggered and spaced apart, and the first elastic strip 11 and the second elastic strip 12 are staggered and spaced apart, forming a corrugated buffer strip. This buffers the sides of the vertical part 7 and the horizontal part 8 in the horizontal direction. At the same time, with the cooperation of multiple polytetrafluoroethylene plates 19 with the front and rear end faces of the vertical part 7 and the horizontal part 8, the front and rear sides of the horizontal part 8 and the vertical part 7 are further buffered. Combined with the end plate 3, it effectively buffers the ends of the stair body 2 in the horizontal direction, eliminates the impact of vibration, and allows the stair body 2 to move to a certain extent in the horizontal direction.

[0024] The longitudinal buffer includes steel bars 15. Two movable grooves 14 are opened opposite each other on the bottom of the inner side of the second groove 6. Several steel bars 15 are fixed inside the movable grooves 14. Movable blocks 16 are movably sleeved on the steel bars 15. Two adjacent movable blocks 16 in the horizontal direction are fixedly connected to the two ends of the bottom elastic steel plate 13 of the arch structure. Springs 17 are sleeved on the outside of the steel bars 15. One end of the spring 17 is fixedly connected to the movable block 16, and the other end of the spring 17 is engaged with the inner wall of the movable groove 14.

[0025] Two polystyrene foam boards 18 are arranged opposite each other on the top of the inner wall of the second groove 6, and the polystyrene foam boards 18 cooperate with the top surface of the transverse part 8.

[0026] Through the bottom elastic steel plate 13 of the arched structure, combined with the sliding cooperation of the movable block 16 and the steel bar 15, and the elastic effect of the spring 17, a buffer is effectively formed at the bottom of the horizontal part 8. At the same time, combined with the cooperation between the polystyrene foam board 18 and the top surface of the horizontal part 8, a buffer is further formed on the upper side of the horizontal part 8. Combined with the end plate 3, a buffer effect is effectively formed at the end of the stair body 2 in the vertical direction, eliminating the impact of vibration, so that the stair body 2 can move to a certain extent in the vertical direction.

[0027] The side face of the end plate 3 is filled with silicone sealant 21 between it and the inner wall of the placement groove 4, and the top of the structural beam floor slab 1 is bonded with a building surface layer 20.

[0028] A construction method comprising the following steps: S1. First, build a template, pour the horizontal part 8, and reserve grouting pipes on the horizontal part 8. At the same time, embed several second elastic steel plates 10 into the two side surfaces of the horizontal part 8. Simultaneously, pour the vertical part 7 through the template, and reserve grouting holes on the vertical part 7. At the same time, embed several second elastic strips 12 into the two side surfaces of the vertical part 7. S2. The lower part of the structural beam floor slab 1 is poured in a segmented manner, so that the second groove 6 and the movable groove 14 are formed during the pouring process. The structural beam floor slab 1 is made of fine stone concrete. The steel bar 15 is stuck in the corresponding position in the movable groove 14, and the movable block 16 is moved into the movable groove 14. At the same time, the first elastic steel plate 9 is embedded in both sides of the inner wall of the second groove 6. S3. Place the hardened transverse part 8 inside the second groove 6, and drive the second elastic steel plate 10 to be inserted at intervals between two adjacent first elastic steel plates 9 at the corresponding positions. S4. Continue to build the formwork and pour the upper part of the structural beam floor slab 1, so that the pouring forms the first groove 5 and the placement groove 4, and embed several first elastic strips 11 into the inner wall of the first groove 5 on both sides. After hardening, place the polystyrene foam board 18 coated with structural adhesive into the gap between the top surface of the transverse part 8 and the inner wall of the second groove 6, and make the side of the polystyrene foam board 18 coated with structural adhesive adhere to the inner wall of the second groove 6. Then, attach several polytetrafluoroethylene boards 19 to the front and rear sides of the inner walls of the first groove 5 and the second groove 6 respectively. S5. Insert the vertical part 7 into the first groove 5 from top to bottom, so that the grouting pipe on the horizontal part 8 is inserted into the hole on the vertical part 7, and the second elastic strips 12 on both sides are inserted at intervals between the two adjacent first elastic strips 11 at the corresponding positions. S6. Grouting is carried out through the grouting pipe to fix the vertical part 7 and the horizontal part 8 together. At the same time, the end plate 3 is cast on the top of the vertical part 7 and the stair body 2 is constructed upward along the end plate 3. Example

[0029] When the building is subjected to vibration or pedestrians cause vibration to the staircase, the end plate 3 of the staircase body 2 is affected by the vibration. In the horizontal direction, a corrugated buffer zone is formed by the staggered arrangement of the first elastic steel plate 9 and the second elastic steel plate 10, and the staggered arrangement of the first elastic strip 11 and the second elastic strip 12. This buffers the sides of the vertical part 7 and the horizontal part 8 in the horizontal direction. At the same time, with the cooperation of multiple polytetrafluoroethylene plates 19 with the front and rear ends of the vertical part 7 and the horizontal part 8, the buffering effect is further achieved on the front and rear sides of the horizontal part 8 and the vertical part 7, thereby achieving a buffering effect on the end plate 3 in the horizontal direction. Simultaneously, in the vertical direction, the horizontal section 8 presses down, exerting downward pressure on the bottom elastic steel plate 13. Combined with the sliding cooperation between the movable block 16 and the reinforcing bar 15, this further compresses the spring 17 by pressing the movable blocks 16 on both sides. Under the elastic action of the spring 17, combined with the elastic action of the bottom elastic steel plate 13, a buffer is effectively formed in the vertical direction at the bottom of the horizontal section 8. At the same time, combined with the cooperation between the polystyrene foam board 18 and the top surface of the horizontal section 8, a buffer is further formed on the upper side of the horizontal section 8. This achieves a buffering effect on the end plate 3 in the vertical direction, thus achieving the purpose of buffering the stair body 2 in both the horizontal and vertical directions. This allows the stair body 2 to move to a certain extent in both the horizontal and vertical directions, eliminating the disadvantage that existing slab staircases are usually cast integrally with the building, and the two ends of the slab staircase are rigidly connected to the upper and lower platforms of the building, which often leads to the staircase being damaged before the main structure in the event of earthquakes or other vibrations.

[0030] It should be further noted that the installation structure, connection method, or setting method of each component in this invention are all common mechanical methods, and any method that can achieve its beneficial effect can be implemented.

[0031] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," 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 invention. In this specification, illustrative expressions of the above terms do not necessarily refer 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.

[0032] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A sliding support device for a high-rise staircase, comprising a structural beam floor slab (1) and a staircase body (2), characterized in that, The end plate (3) is fixedly provided at the end of the stair body (2). The placement groove (4) is provided on the structural beam floor slab (1). The end plate (3) and the placement groove (4) cooperate with each other. The bottom of the inner wall of the placement groove (4) is provided with a first groove (5). The bottom of the inner wall of the first groove (5) is provided with a second groove (6). The bottom surface of the end plate (3) is fixed with a vertical part (7). The vertical part (7) is movably cooperated with the first groove (5). The end of the vertical part (7) away from the end plate (3) is fixed with a horizontal part (8). The horizontal part (8) is placed in the second groove (6). The horizontal part (8) is movably cooperated with the second groove (6). The bottom elastic steel plate (13) with an arch structure is provided on the lower side of the horizontal part (8). The vertical part (7) and the horizontal part (8) form a buffer block with a T-shaped cross section. The side of the buffer block is provided with a horizontal buffer member, and the bottom of the buffer block is provided with a vertical buffer member.

2. The sliding support device for a high-rise staircase according to claim 1, characterized in that, The transverse buffer includes a first elastic steel plate (9), a second elastic steel plate (10), a first elastic strip (11), and a second elastic strip (12). A plurality of the first elastic steel plates (9) are disposed opposite to each other on the left and right sides of the inner wall of the second groove (6), and a plurality of the second elastic steel plates (10) are fixed opposite to each other on the left and right sides of the transverse part (8). The first elastic steel plate (9) and the second elastic steel plate (10) are both arc-shaped structures, and adjacent first elastic steel plates (9) and second elastic steel plates (10) are staggered and spaced apart.

3. A sliding support device for a high-rise staircase according to claim 2, characterized in that, A plurality of first elastic strips (11) are disposed opposite to each other on both sides of the inner wall of the first groove (5), and a plurality of second elastic strips (12) are disposed opposite to each other on both sides of the vertical part (7). The first elastic strips (11) and the second elastic strips (12) are both arc-shaped structures, and adjacent first elastic strips (11) and second elastic strips (12) are staggered.

4. A sliding support device for a high-rise staircase according to claim 3, characterized in that, The longitudinal buffer includes a steel bar (15). Two movable grooves (14) are opened opposite each other on the bottom side of the second groove (6). Several steel bars (15) are fixed inside the movable grooves (14). Movable blocks (16) are movably sleeved on the steel bars (15). Two adjacent movable blocks (16) in the horizontal direction are fixedly connected to the two ends of the bottom elastic steel plate (13) of the arch structure. A spring (17) is sleeved on the outside of the steel bar (15). One end of the spring (17) is fixedly connected to the movable block (16), and the other end of the spring (17) is engaged with the inner wall of the movable groove (14).

5. A sliding support device for a high-rise staircase according to claim 4, characterized in that, Two polystyrene foam boards (18) are arranged opposite each other on the top of the inner wall of the second groove (6), and the polystyrene foam boards (18) cooperate with the top surface of the transverse part (8).

6. A sliding support device for a high-rise staircase according to claim 5, characterized in that, Polytetrafluoroethylene (PTFE) plates (19) are provided on the front and rear sides of the inner walls of the first groove (5) and the second groove (6), and several of the PTFE plates (19) respectively cooperate with the front and rear end faces of the vertical part (7) and the horizontal part (8).

7. A sliding support device for a high-rise staircase according to claim 6, characterized in that, The side end face of the end plate (3) and the inner wall of the placement groove (4) are filled with silicone sealant (21), and the top of the structural beam floor slab (1) and the end plate (3) are bonded with a building surface layer (20).

8. A construction method, based on the sliding support device for high-rise stairs as described in claims 1-7, characterized in that, Includes the following steps: S1. First, build a template, pour the horizontal part (8), and reserve grouting pipes on the horizontal part (8). At the same time, embed several second elastic steel plates (10) into the two sides of the horizontal part (8). Meanwhile, pour the vertical part (7) through the template, and reserve grouting holes on the vertical part (7). At the same time, embed several second elastic strips (12) into the two sides of the vertical part (7). S2. The lower part of the structural beam floor slab (1) is poured in a segmented pouring manner, so that the second groove (6) and the movable groove (14) are formed during the pouring process. The structural beam floor slab (1) is made of fine stone concrete. The steel bar (15) is stuck in the corresponding position in the movable groove (14) and the movable block (16) is moved into the movable groove (14). At the same time, the first elastic steel plate (9) is embedded in both sides of the inner wall of the second groove (6). S3. Place the hardened transverse part (8) inside the second groove (6) and drive the second elastic steel plate (10) to be inserted between two adjacent first elastic steel plates (9) at corresponding positions. S4. Continue to build the template and pour the upper part of the structural beam floor slab (1) so that the pouring forms the first groove (5) and the placement groove (4), and embed several first elastic strips (11) into the inner walls of the first groove (5). After hardening, place the polystyrene foam board (18) coated with structural adhesive into the gap between the top surface of the transverse part (8) and the inner wall of the second groove (6), and make the side of the polystyrene foam board (18) coated with structural adhesive adhere to the inner wall of the second groove (6). Then, attach several polytetrafluoroethylene boards (19) to the front and back sides of the inner walls of the first groove (5) and the second groove (6) respectively. S5. Insert the vertical part (7) into the first groove (5) from top to bottom, so that the grouting pipe on the horizontal part (8) is inserted into the hole on the vertical part (7), and the second elastic strips (12) on both sides are inserted between the two adjacent first elastic strips (11) at the corresponding positions. S6. Grouting is carried out through the grouting pipe to fix the vertical part (7) and the horizontal part (8) together. At the same time, the end plate (3) is cast on the top of the vertical part (7) and the stair body (2) is constructed upward along the end plate (3).

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