Low-carbon assembly type prefabricated stair based on bamboo wood

Abstract

The utility model discloses a bamboo-based low-carbon assembly type prefabricated staircase, which belongs to the technical field of prefabricated staircases, and comprises a staircase support body and steps, the steps are fixedly arranged on the staircase support body, and the steps are of a step-shaped structure formed by pouring concrete; the stair supporting body comprises a stair flight plate and sliding ends at the two ends of the stair flight plate, the stair flight plate comprises a connecting and fixing mechanism and a first concrete protection layer poured on the outer side of the connecting and fixing mechanism, and each sliding end comprises an edge stirrup, an edge reinforcing mechanism and a second concrete protection layer poured on the outer side of the edge stirrup and the outer side of the edge reinforcing mechanism. And the stair flight plate is connected with the sliding end through a connecting and fixing mechanism. According to the low-carbon assembly type prefabricated stair based on the bamboo wood, the reliability and the deformation resistance of connecting joints are improved, the light weight, the high strength and the good toughness of the bamboo wood are brought into full play, the dead weight of the stair is effectively reduced, and the structural stability is improved.

Description

A low-carbon prefabricated staircase based on bamboo Technical Field

[0001] This utility model relates to the field of prefabricated staircase technology, and in particular to a low-carbon prefabricated staircase based on bamboo. Background Technology

[0002] Precast stairs are building components that are manufactured as a whole in a factory and then delivered directly to the construction site for assembly. Compared to traditional cast-in-place stairs, this technology not only avoids complex on-site processes such as formwork and pouring, but also overcomes the limitations of using only concrete as a material. Through industrialized production, it significantly saves labor costs and optimizes project costs. At the same time, the modular installation characteristics shorten the construction cycle, effectively improving project construction efficiency.

[0003] Against the backdrop of the deepening of green building concepts, the demand for new building materials that combine eco-friendliness and ease of construction is becoming increasingly prominent. Bamboo, with its renewable properties, high strength-to-weight ratio, and rapid growth characteristics, has become an important direction in modern architectural research. However, existing bamboo-structured staircases suffer from technical bottlenecks such as insufficient reliability of connection nodes and weak resistance to deformation, which restricts their large-scale application. Summary of the Invention

[0004] The purpose of this invention is to provide a low-carbon prefabricated staircase based on bamboo. By setting up edge reinforcement mechanisms and connection fixing mechanisms, the reliability and deformation resistance of the connection nodes are improved. Using bamboo as the main raw material, the lightweight, high strength and good toughness of bamboo are fully utilized, which effectively reduces the self-weight of the staircase and improves the stability of the structure.

[0005] To achieve the above objectives, this utility model provides a low-carbon prefabricated staircase based on bamboo, including a staircase support and steps. The steps are fixedly provided on the staircase support and are stepped structures made of concrete.

[0006] The stair support includes a stair slab and sliding ends at both ends of the stair slab. The stair slab includes a connecting and fixing mechanism and a concrete protective layer I poured on the outside of the connecting and fixing mechanism. The sliding ends include edge stirrups, an edge reinforcement mechanism, and a concrete protective layer II poured on the outside of the edge stirrups and the edge reinforcement mechanism. The stair slab and the sliding ends are connected by the connecting and fixing mechanism. Suspension point reinforcing ribs are provided between the stair slab and the treads.

[0007] Preferably, the edge reinforcement mechanism includes edge longitudinal steel bars, longitudinal bamboo fiber wire wrapped bamboo reinforcement, and perforated bamboo reinforcement. The edge longitudinal steel bars are symmetrically arranged at the four corners inside the sliding end, and the edge longitudinal steel bars are provided with longitudinal bamboo fiber wire wrapped bamboo reinforcement in the middle. The perforated bamboo reinforcement is symmetrically arranged at the four corners inside the sliding end. The perforated bamboo reinforcement is U-shaped, and the perforated bamboo reinforcement is tied to the edge longitudinal steel bars and the longitudinal bamboo fiber wire wrapped bamboo reinforcement.

[0008] Preferably, the edge stirrups include a dense zone and a non-dense zone arranged along the length of the sliding end. The non-dense zone is located in the middle of the sliding end, and the dense zone is located at both ends of the sliding end. The spacing between the non-dense zones is 145-155mm, and the spacing between the dense zones is 90-110mm. The edge stirrups, edge longitudinal steel bars, and longitudinal bamboo fiber wire wrapped bamboo bars are all tied together.

[0009] Preferably, the spacing between the longitudinal bamboo fiber strands wrapped around the bamboo reinforcement and the adjacent edge longitudinal reinforcement is 130-150mm.

[0010] Preferably, the connecting and fixing mechanism includes longitudinal bamboo ribs, longitudinal steel bars, upper edge reinforcing bars, lower edge reinforcing bars, upper distributed bamboo ribs, and lower distributed bamboo ribs. The longitudinal bamboo ribs are located in the middle of the stair section slab, and the longitudinal steel bars are located at both ends of the stair section slab. The upper distributed bamboo ribs and lower distributed bamboo ribs are arranged vertically inside the longitudinal bamboo ribs and longitudinal steel bars, and the upper edge reinforcing bars and lower edge reinforcing bars are arranged vertically inside the upper distributed bamboo ribs and lower distributed bamboo ribs.

[0011] The lower ends of both the longitudinal bamboo ribs and the longitudinal steel bars are provided with a first bend at the bottom sliding end, the upper and lower ends of the upper edge reinforcing ribs are provided with a second bend at the sliding end, and the lower end of the lower edge reinforcing ribs is provided with a second bend at the sliding end. The angle between the first bend and the second bend is greater than 90°.

[0012] Preferably, the longitudinal bamboo strips are spaced apart along the length of the sliding end, with a spacing of 190-210mm between the longitudinal bamboo strips, and the spacing between the longitudinal steel bar and the adjacent longitudinal bamboo strip is 140-160mm. The longitudinal bamboo strips and longitudinal steel bars are all tied to the longitudinal bamboo fiber line wrapped bamboo strips and the edge longitudinal steel bars.

[0013] Preferably, the upper and lower distributed bamboo strips are spaced apart along the length of the stair section slab and are perpendicular to the side of the stair section slab. Their length is the same as the width of the stair section slab, and both ends have a third bend. The upper and lower distributed bamboo strips are tied to the longitudinal bamboo strips and longitudinal steel bars.

[0014] Preferably, both the upper and lower edge reinforcing bars are connected to the upper distributed bamboo bars, the lower distributed bamboo bars, the edge longitudinal reinforcing bars, the longitudinal bamboo fiber wire wrapped bamboo bars, and the longitudinal reinforcing bars.

[0015] Preferably, the steps are equipped with stair handrails, which include vertical bamboo tubes, horizontal bamboo tubes, dense horizontal bamboo tubes, and dense vertical bamboo tubes. The vertical bamboo tubes match the pre-drilled holes in the circular bamboo tubes on the steps. The vertical bamboo tubes are spaced apart on the steps. The top of the vertical bamboo tubes is fixedly connected to the horizontal bamboo tubes. The middle and bottom of the vertical bamboo tubes are fixedly connected to the dense horizontal bamboo tubes. The dense horizontal bamboo tubes on both sides are fixedly connected to the dense vertical bamboo tubes.

[0016] Preferably, a pre-installed bamboo tube is provided at the middle position of both ends of the step, and the pre-installed bamboo tube is tied to the longitudinal bamboo rib, the upper distributed bamboo rib, and the lower distributed bamboo rib; the step without a pre-installed bamboo tube has a hollow bamboo tube inside, and the length of the hollow bamboo tube is the same as the width of the stair tread.

[0017] Preferably, the bottom of the ladder section is provided with a bamboo tube for longitudinal wiring pipe, and rectangular installation holes are provided on both sides of the sliding end.

[0018] Preferably, the thickness of both concrete protective layer one and concrete protective layer two is 15-25mm.

[0019] Therefore, the present invention employs the above-mentioned low-carbon prefabricated staircase based on bamboo, which has the following beneficial effects:

[0020] (1) By setting up edge reinforcement mechanism and connection fixing mechanism, the reliability and deformation resistance of connection nodes are improved, and the strength and stability of stair support are enhanced;

[0021] (2) Using bamboo as the main raw material fully utilizes the lightweight, high strength and good toughness of bamboo, effectively reducing the self-weight of the staircase and improving the stability of the structure;

[0022] (3) The design of the longitudinal wiring conduit is reserved with bamboo tubes for the arrangement of electrical conduits, making maintenance and upgrades more convenient;

[0023] (4) It takes into account the sustainable use of materials, reduces carbon emissions during construction, meets the requirements of modern buildings for environmental protection and energy conservation, and has significant economic and social benefits.

[0024] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the overall structure of a low-carbon prefabricated staircase based on bamboo according to the present invention.

[0026] Figure 2 is a cross-sectional view at point A of a first embodiment of a low-carbon prefabricated staircase based on bamboo according to this utility model.

[0027] Figure 3 is a cross-sectional view at point B of a first embodiment of a low-carbon prefabricated staircase based on bamboo according to this utility model.

[0028] Figure 4 is a perspective view of the stair support body of a low-carbon prefabricated staircase based on bamboo according to Embodiment 1 of this utility model.

[0029] Figure 5 is a schematic diagram of the sliding end structure of a low-carbon prefabricated staircase based on bamboo according to Embodiment 1 of this utility model.

[0030] Figure 6 is a cross-sectional view at point C of a first embodiment of a low-carbon prefabricated staircase based on bamboo according to this utility model.

[0031] Figure Labels

[0032] 1. Steps; 2. Stair treads; 3. Pre-drilled holes for small bamboo tubes in round handrails; 4. Pre-drilled rectangular installation holes; 5. Pre-drilled bamboo tubes for hoisting; 6. Hollow bamboo tubes; 7. Longitudinal reinforcing bars at the edges; 8. Longitudinal bamboo fiber wrapped bamboo reinforcement; 9. Edge stirrups; 10. Longitudinal bamboo reinforcement; 11. Longitudinal reinforcing bars; 12. Upper distributed bamboo reinforcement; 13. Lower distributed bamboo reinforcement; 14. Reinforcing bars at hanging points; 15. Sliding end; 16. Small vertical bamboo tubes for handrails; 17. Large horizontal bamboo tubes for handrails; 18. Densified horizontal bamboo tubes; 19. Densified vertical bamboo tubes; 20. Stair handrails; 21. Pre-drilled bamboo tubes for longitudinal wiring conduits; 22. Reinforcing bamboo reinforcement with holes; 23. Upper edge reinforcement; 24. Lower edge reinforcement; 25. Staircase support; 26. Concrete protective layer one; 27. Concrete protective layer two. Detailed Implementation

[0033] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0034] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] Example 1

[0036] As shown in Figures 1 to 3, a low-carbon prefabricated staircase based on bamboo includes a staircase support 25 and steps 1. The staircase support 25 serves as the main load-bearing structure of the entire prefabricated staircase, and steps 1 are fixedly installed on it. Steps 1 are stepped structures made of concrete, which facilitates people to go up and down the stairs safely and comfortably.

[0037] As shown in Figure 4, the stair support 25 includes a stair tread 2 and sliding ends 15 at both ends of the stair tread 2. The stair tread 2 includes a connecting and fixing mechanism and a concrete protective layer 26 cast on the outside of the connecting and fixing mechanism. It is the main horizontal load-bearing component of the staircase, bearing the load transmitted from the steps 1 and distributing it to the sliding ends 15 at both ends of the staircase. It also provides a foundation for the installation and fixing of the steps 1. The stair tread 2 and the sliding ends 15 are connected by the connecting and fixing mechanism. The sliding ends 15 are located at both ends of the stair tread 2 and include edge stirrups 9, edge reinforcement mechanisms, and a second concrete protective layer 27 cast on the outside of the edge stirrups 9 and edge reinforcement mechanisms. The structural design of the sliding ends 15 allows the staircase to slide and deform within a certain range, thereby reducing stress concentration inside the staircase structure and improving the stability and safety of the staircase. The thickness of both the first concrete protective layer 26 and the second concrete protective layer 27 is 25mm.

[0038] As shown in Figure 5, the edge reinforcement mechanism includes edge longitudinal steel bars 7, longitudinal bamboo fiber wrapped bamboo reinforcing bars 8, and perforated reinforcing bamboo reinforcing bars 22. The edge longitudinal steel bars 7 have a diameter of 12mm and a length equal to the width of the sliding end 15. They are symmetrically arranged at the four corners inside the sliding end 15 to bear the tensile and compressive forces generated by the sliding end 15 under load, thereby improving the bending strength of the sliding end 15. The edge longitudinal steel bars 7 have longitudinal bamboo fiber wrapped bamboo reinforcing bars 8 in the middle, and the distance between the longitudinal bamboo fiber wrapped bamboo reinforcing bars 8 and the adjacent edge longitudinal steel bars 7 is 150mm. The length of the longitudinal bamboo fiber wrapped bamboo reinforcing bars 8 is equal to the width of the sliding end 15, with a width of 30mm and a thickness of 9mm. It replaces steel bars, reducing the use of steel bars and lightening the self-weight of the stair support 25. At the same time, it utilizes the high strength and toughness of bamboo fiber to improve the overall performance of the stair support 25. The perforated bamboo reinforcement is U-shaped, with a length of 280mm, a width of 30mm, and a thickness of 8mm. It is symmetrically arranged at the four corners inside the sliding end 15 and is tied to the edge longitudinal steel bar 7 and the longitudinal bamboo fiber wire wrapped bamboo reinforcement 8 to further enhance the strength and deformation resistance of the sliding end 15 and prevent stress concentration and cracks in these parts.

[0039] The edge stirrups 9 include a reinforced zone and a non-reinforced zone along the length of the sliding end 15. The non-reinforced zone is located in the middle of the sliding end 15, and the reinforced zone is located at both ends of the sliding end 15. The spacing between the non-reinforced zones is 145 mm, and the spacing between the reinforced zones is 110 mm. Their function is to restrain the lateral deformation of the concrete, improve the compressive strength and ductility of the concrete, enhance the shear resistance of the sliding end 15, and prevent the sliding end 15 from shearing failure under load. The edge stirrups 9, the edge longitudinal reinforcement 7, and the longitudinal bamboo fiber wrapped bamboo reinforcement 8 are all tied together to improve the overall stability of the sliding end 15.

[0040] The sliding end 15 is provided with a reserved rectangular mounting hole 4 for connecting and fixing with other structures of the building. The prefabricated staircase is reliably connected to the main structure of the building through bolts, embedded parts and other connecting parts, so as to ensure the stability and safety of the staircase during use.

[0041] As shown in Figure 6, the connecting and fixing mechanism includes longitudinal bamboo ribs 10, longitudinal steel bars 11, upper edge reinforcing ribs 23, lower edge reinforcing ribs 24, upper distributed bamboo ribs 12, and lower distributed bamboo ribs 13, which further improves the strength and reliability of the connection between the ladder plate 2 and the sliding end 15, and ensures that the load can be effectively transferred.

[0042] The longitudinal bamboo ribs 10 are 30mm wide and 10mm thick, and are located in the middle of the stair tread 2, spaced 200mm apart along the length of the sliding end 15. Using bamboo instead of steel bars reduces the self-weight of the stair support 25.

[0043] Longitudinal bamboo ribs 10 are provided with longitudinal reinforcing bars 11 at both ends. The longitudinal reinforcing bars 11 are located at the edges of both ends of the stair slab 2. The diameter of the longitudinal reinforcing bars 11 is 12mm, and the distance between the longitudinal reinforcing bars 11 and the adjacent longitudinal bamboo ribs 10 is 150mm, which enhances the overall strength and load-bearing capacity of the stair slab 2. The lower ends of both the longitudinal bamboo ribs 10 and the longitudinal reinforcing bars 11 are provided with a first bend at the bottom sliding end 15. The first bend angle is 100° to ensure the anchorage length. The longitudinal bamboo ribs 10 and the longitudinal reinforcing bars 11 are tied to the longitudinal bamboo fiber thread-wound bamboo ribs 8 and the edge longitudinal reinforcing bars 7, which further improves the strength and reliability of the connection between the stair slab 2 and the sliding end 15.

[0044] The upper and lower bamboo reinforcing bars 12 and 13 are vertically positioned inside the longitudinal bamboo reinforcing bars 10 and 11, with a spacing of 230mm between them. The upper and lower bamboo reinforcing bars 12 and 13 are spaced apart along the length of the stair slab 2 and are perpendicular to the side of the stair slab 2. Their length is the same as the width of the stair slab 2, with a width of 30mm and a thickness of 8mm. Both ends have a third bend at a 90° angle and a length of 80mm, serving to distribute loads and prevent cracks in the stair slab 2. The upper and lower bamboo reinforcing bars 12 and 13 are tied to the longitudinal bamboo reinforcing bars 10 and 11, enhancing the horizontal integrity of the stair slab 2 and the sliding end 15.

[0045] The upper edge reinforcing rib 23 and the lower edge reinforcing rib 24 are vertically arranged inside the upper distributed bamboo rib 12 and the lower distributed bamboo rib 13. The upper and lower ends of the upper edge reinforcing rib 23 are provided with a second bend at the sliding end 15, and the lower end of the lower edge reinforcing rib 24 is provided with a second bend at the sliding end 15. The second bend angle is 100°. The upper edge reinforcing rib 23 and the lower edge reinforcing rib 24 are tied and connected to the upper distributed bamboo rib 12, the lower distributed bamboo rib 13, the edge longitudinal reinforcing bar 7, the longitudinal bamboo fiber wire wrapped bamboo rib 8, and the longitudinal reinforcing bar 11, which further improves the strength and reliability of the connection between the stair section slab 2 and the sliding end 15, and ensures that the load can be effectively transferred.

[0046] The bottom of the stair slab 2 is provided with a bamboo tube 21 for longitudinal wiring. The diameter of the bamboo tube 21 for longitudinal wiring is 3cm. It provides a channel for the laying of stair lighting, monitoring and other wiring, so that the wiring can be laid neatly and concealed, without affecting the aesthetics and use of the stair, and at the same time, it facilitates the maintenance and repair of the wiring.

[0047] A lifting point reinforcing rib 14 is provided between the stair slab 2 and the step 1 to enhance the structural strength of the staircase during hoisting and ensure that the staircase will not be damaged due to uneven stress during hoisting and transportation.

[0048] A stair handrail 20 is provided on step 1. The stair handrail 20 includes vertical bamboo tubes 16, horizontal bamboo tubes 17, dense horizontal bamboo tubes 18, and dense vertical bamboo tubes 19. The vertical bamboo tubes 16 have a diameter of 6cm and a length of 120cm, and they match the pre-drilled holes 3 in the circular bamboo tubes on step 1. The vertical bamboo tubes 16 are spaced apart on step 1, serving to support the horizontal bamboo tubes 17 and also providing a gripping point for people going up and down the stairs, ensuring walking safety. The top of the vertical bamboo tubes 16 is fixedly connected to the horizontal bamboo tubes 17. The horizontal bamboo tubes 17 have a diameter of 11cm and have multiple pre-drilled holes of the same size as the vertical bamboo tubes 16, facilitating assembly with the vertical bamboo tubes 16. The vertical bamboo tubes 16 of the handrail are fixedly connected to the middle and bottom of the reinforced horizontal bamboo tubes 18. The vertical bamboo tubes 16 have multiple pre-drilled holes with the same diameter as the reinforced horizontal bamboo tubes 18. The reinforced horizontal bamboo tubes 18 have a diameter of 5cm. The distance between the lower reinforced horizontal bamboo tube 18 and the larger horizontal bamboo tube 17 of the handrail is 10cm. The upper reinforced horizontal bamboo tube 18 is 10cm from the upper surface of the step 1. The reinforced horizontal bamboo tubes 18 on both sides are fixedly connected to the reinforced vertical bamboo tubes 19. The reinforced horizontal bamboo tubes 18 have multiple pre-drilled holes with the same diameter as the reinforced vertical bamboo tubes 19. The reinforced vertical bamboo tubes 19 have a diameter of 3cm and are spaced 10cm apart.

[0049] A 30mm diameter bamboo tube 5 is installed at the midpoint of both ends of step 1, positioned 200mm from the edge of the stair slab 2. The bamboo tube 5 is tied to the longitudinal bamboo reinforcement 10, the upper distribution bamboo reinforcement 12, and the lower distribution bamboo reinforcement 13, serving as a lifting point during stair installation to facilitate accurate installation of the prefabricated staircase into the designated position using hoisting equipment. Steps without the bamboo tube 5 have hollow bamboo tubes 6 inside, each 6cm in diameter and the same length as the width of the stair slab 2. The distance between the hollow bamboo tube 6 and the pre-drilled holes 3 in the circular handrail bamboo tubes is 35mm. The hollow bamboo tubes 6 reduce the weight of step 1 while also providing sound and heat insulation to some extent, improving the performance of the prefabricated staircase.

[0050] Therefore, this utility model adopts the above-mentioned low-carbon prefabricated staircase based on bamboo. By setting edge reinforcement mechanism and connection fixing mechanism, the reliability and deformation resistance of the connection node are improved. By using bamboo as the main raw material, the lightweight, high strength and good toughness of bamboo are fully utilized, which effectively reduces the self-weight of the staircase and improves the stability of the structure.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A low-carbon prefabricated staircase based on bamboo, characterized in that, The staircase includes a stair support and steps. Steps are fixedly installed on the stair support and are stepped structures made of cast concrete. The stair support includes a stair slab and sliding ends at both ends of the stair slab. The stair slab includes a connecting and fixing mechanism and a concrete protective layer I poured on the outside of the connecting and fixing mechanism. The sliding ends include edge stirrups, an edge reinforcement mechanism, and a concrete protective layer II poured on the outside of the edge stirrups and the edge reinforcement mechanism. The stair slab and the sliding ends are connected by the connecting and fixing mechanism. Suspension point reinforcing ribs are provided between the stair slab and the steps.

2. The prefabricated staircase according to claim 1, characterized in that, The edge reinforcement mechanism includes edge longitudinal steel bars, longitudinal bamboo fiber wire wrapped bamboo reinforcement, and perforated bamboo reinforcement. The edge longitudinal steel bars are symmetrically arranged at the four corners inside the sliding end. The edge longitudinal steel bars are provided with longitudinal bamboo fiber wire wrapped bamboo reinforcement in the middle. The perforated bamboo reinforcement is symmetrically arranged at the four corners inside the sliding end. The perforated bamboo reinforcement is U-shaped. The perforated bamboo reinforcement is tied to the edge longitudinal steel bars and the longitudinal bamboo fiber wire wrapped bamboo reinforcement.

3. The prefabricated staircase according to claim 2, characterized in that, The edge stirrups include a reinforced zone and a non-reinforced zone set along the length of the sliding end. The non-reinforced zone is located in the middle of the sliding end, and the reinforced zone is located at both ends of the sliding end. The spacing between the non-reinforced zones is 145-155mm, and the spacing between the reinforced zones is 90-110mm. The edge stirrups, edge longitudinal steel bars, and longitudinal bamboo fiber wire wrapped bamboo bars are all tied together.

4. The prefabricated staircase according to claim 3, characterized in that, The connecting and fixing mechanism includes longitudinal bamboo ribs, longitudinal steel bars, upper edge reinforcing bars, lower edge reinforcing bars, upper distributed bamboo ribs, and lower distributed bamboo ribs. The longitudinal bamboo ribs are located in the middle of the stair slab, and the longitudinal steel bars are located at both ends of the stair slab. The upper and lower distributed bamboo ribs are located inside the longitudinal bamboo ribs and longitudinal steel bars in the vertical direction. The upper and lower edge reinforcing bars are located inside the upper and lower distributed bamboo ribs in the vertical direction. The lower ends of the longitudinal bamboo ribs and longitudinal steel bars are provided with a first bend at the bottom sliding end. The upper and lower ends of the upper edge reinforcing bars are provided with a second bend at the sliding end. The lower end of the lower edge reinforcing bars is provided with a second bend at the sliding end. The angles of the first bend and the second bend are both greater than 90°.

5. The prefabricated staircase according to claim 4, characterized in that, The steps are equipped with stair handrails, which include vertical bamboo tubes, horizontal bamboo tubes, dense horizontal bamboo tubes, and dense vertical bamboo tubes. The vertical bamboo tubes match the pre-drilled holes in the circular bamboo tubes on the steps. The vertical bamboo tubes are spaced apart on the steps. The top of the vertical bamboo tubes is fixedly connected to the horizontal bamboo tubes. The middle and bottom of the vertical bamboo tubes are fixedly connected to the dense horizontal bamboo tubes. The dense horizontal bamboo tubes on both sides are fixedly connected to the dense vertical bamboo tubes.

6. The prefabricated staircase according to claim 5, characterized in that, The middle of both ends of the steps is provided with a pre-installed bamboo tube for hoisting. The pre-installed bamboo tube is tied to the longitudinal bamboo ribs, the upper distributed bamboo ribs, and the lower distributed bamboo ribs. The steps without pre-installed bamboo tubes for hoisting are provided with hollow bamboo tubes inside. The length of the hollow bamboo tube is the same as the width of the stair tread.

7. The prefabricated staircase according to claim 1, characterized in that, The bottom of the ladder section is equipped with a bamboo tube for longitudinal wiring, and rectangular installation holes are provided on both sides of the sliding end.

8. The prefabricated staircase according to claim 1, characterized in that, The thickness of both concrete protective layer one and concrete protective layer two is 15-25mm.

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