A super-large cantilever steel structure stair structure

Abstract

The utility model relates to steel structure stair technical field discloses a kind of super-large cantilever steel structure stair structure, including top ladder section, first middle ladder section, bottom ladder section and second middle ladder section, the top ladder section, first middle ladder section, bottom ladder section and second middle ladder section inside are provided with connecting rod, every side of the connecting rod is provided with two side plates, the middle of the side plate is provided with first mounting hole and second mounting hole, connecting plate is arranged between the two side plates of the connecting rod side, the two sides of the connecting plate are provided with mortise and tenon head, the first mounting hole is used to insert mortise and tenon head, the outer wall of mortise and tenon head and the inner wall of first mounting hole are fixed using welding. In the utility model, by mortise and tenon head and the first mounting hole of side plate cooperation welding in the connecting rod two sides, to improve the existing steel structure stair due to generally using direct welding mode, thereby causing welding quality fluctuation, the problem of insufficient security guarantee.

Description

Technical Field

[0001] This utility model relates to the field of steel structure staircase technology, and in particular to an ultra-large cantilever steel structure staircase structure. Background Technology

[0002] Precast steel staircases are staircase systems made primarily of steel, prefabricated in a factory and assembled on-site. They mainly consist of steel stair sections, platform beams, platform slabs, and handrails. Their core advantage lies in transforming traditional on-site staircase construction into an industrialized production model. The beams, slabs, and treads are precisely processed and treated for corrosion resistance in the factory, requiring only bolt connections or welding on-site, significantly shortening the construction cycle and reducing noise and dust pollution. These staircases combine high strength and flexibility; the tensile strength of steel is several times that of concrete, while its weight is only 1 / 3 to 1 / 2 that of traditional reinforced concrete staircases. This effectively reduces the load on the building structure and improves its seismic performance, making it particularly suitable for areas with high seismic intensity. Their modular design allows for highly flexible styling, enabling various forms such as straight, spiral, and cantilevered designs. The tread surface can be combined with anti-slip steel plates, wood veneer, stone paving, and other materials, balancing functionality and aesthetics. In terms of application scenarios, prefabricated steel staircases are widely used in various building types, including commercial complexes, office buildings, residential communities, industrial plants, and public facilities. Their factory production process strictly controls quality, with component precision errors controlled to the millimeter level. Installation is unaffected by weather, and the steel is 100% recyclable, aligning with the trend of green building development. With the promotion of prefabricated building technology, prefabricated steel staircases, with their high efficiency, safety, and environmental friendliness, are becoming an important choice for modern building staircase systems.

[0003] The connection of the components of existing steel structure staircases is generally achieved by direct welding on-site using carbon dioxide gas shielded welding. However, this method is limited by the on-site construction environment and process stability, resulting in fluctuations in welding quality and insufficient safety assurance.

[0004] For the connection of the components of the existing steel structure staircase, the method of direct welding by carbon dioxide gas shielded welding on site is generally used. However, due to the limitations of the on-site construction environment and process stability, there are problems such as fluctuations in welding quality and insufficient safety assurance. Therefore, we propose an ultra-large cantilever steel structure staircase structure. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an ultra-large cantilever steel structure staircase, which addresses the problem that the connection of various components of existing steel structure staircases, which is generally achieved through on-site carbon dioxide gas shielded welding, is limited by the on-site construction environment and process stability, resulting in fluctuations in welding quality and insufficient safety assurance.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A super-large cantilever steel structure staircase includes a top stair section, a first middle stair section, a bottom stair section, and a second middle stair section. Connecting rods are installed inside the top stair section, the first middle stair section, the bottom stair section, and the second middle stair section. Two side plates are provided on each side of the connecting rod. A first mounting hole and a second mounting hole are provided in the middle of the side plates. A connecting plate is provided between the two side plates on one side of the connecting rod. Tenons and mortises are provided on both sides of the connecting plate. The first mounting hole is used to insert the tenons and mortises. The outer wall of the tenons and mortises is welded to the inner wall of the first mounting hole. An anti-torsion steel plate is provided at the junction of the bottom stair section and the first middle stair section. The second mounting hole is used to insert the anti-torsion steel plate. The outer wall of the anti-torsion steel plate is welded to the inner wall of the second mounting hole. A handrail groove is provided on the top surface of the connecting plate.

[0007] By adopting the above technical solution, connecting rods are installed inside the top stair section, the first middle stair section, the bottom stair section, and the second middle stair section. The connecting rods are welded to the first mounting holes of the side plates through tenon joints on both sides, thereby forming rigid connection nodes and enhancing the continuity of load transfer between each stair section. This improves the connection of the components of the existing steel structure staircase, which is limited by the on-site construction environment and process stability due to the common use of direct welding with carbon dioxide gas shielded welding, resulting in fluctuations in welding quality and insufficient safety assurance.

[0008] Preferably, a step positioning square steel is provided at the lower end of the bottom stair section, and the side of the step positioning square steel away from the bottom stair section is fixedly connected to the ground.

[0009] Preferably, the rest platform of the first middle section of the staircase is connected to the rest platform of the bottom section of the staircase via a connecting device, the high end of the first middle section of the staircase is fixedly connected to the edge of the first floor platform, the low end of the second middle section of the staircase is fixedly connected to the edge of the first floor platform, the rest platform of the second middle section of the staircase is connected to the rest platform of the top section of the staircase via a connecting device, the high end of the top section of the staircase is fixedly connected to the edge of the second floor platform, and a support beam is provided inside the rest platform.

[0010] Preferably, the connecting device includes a sealing plate and an anti-torsion steel plate. The sealing plate is located on the side of the rest platform away from the stair section, and the anti-torsion steel plate is located inside the rest platform on the side closer to the stair section. A connecting plate is provided in the middle of the two sealing plates, and a first mounting hole is provided in the middle of the sealing plate.

[0011] Preferably, temporary support devices are provided on the side of the top stair section, the first middle stair section, the bottom stair section, and the second middle stair section away from the second floor platform and the first floor platform, and hoisting devices are provided on the top of the top stair section, the first middle stair section, the bottom stair section, and the second middle stair section.

[0012] Preferably, the temporary support device includes uprights and crossbars, and multiple uprights and crossbars are fixed by a connecting structure. The top surface of the bottom crossbar is located at the bottom surface of the high end of the bottom stair section, and the top surface of the high crossbar is located at the bottom surface of the low end of the top stair section.

[0013] Preferably, the connecting structure includes a hanging lug, the end of which is fixedly connected to the outer wall of the upright, a through hole in the middle of the hanging lug, a connecting sleeve fixedly connected to the end of the crossbar, insertion holes corresponding to the top and bottom surfaces of the connecting sleeve, the distance between the top and bottom surfaces of the connecting sleeve being equal to the height of the hanging lug, a limiting plate provided between the hanging lug and the connecting sleeve, the limiting plate being located both inside the through hole and the insertion hole of the hanging lug, the bottom length of the limiting plate being less than the top length, and the side of the limiting plate being triangular.

[0014] Preferably, the bottom of the upright is hollow, a support rod is provided inside the upright, an adjustment handle is provided at the bottom of the upright, an internal thread is provided on the inner wall of the middle part of the adjustment handle, an external thread is provided on the outer wall of the support rod, the external thread on the outer wall of the support rod and the internal thread on the inner wall of the middle part of the adjustment handle are engaged with each other, and the bottom of the support rod is fixedly connected to the top surface of the force plate.

[0015] Preferably, the hoisting device includes a floor fixing plate, the bottom surface of which is disposed on the top surface of the floor slab. Anti-detachment anchors are disposed on both sides of the floor fixing plate, and the anti-detachment anchors pass through both the floor fixing plate and the floor slab. A locking code is disposed in the middle of the floor fixing plate, the bottom of which is disposed at one end of a cable. The other end of the cable is tied to the center of gravity of the top ladder section, the first middle ladder section, the bottom ladder section, and the second middle ladder section.

[0016] This utility model has the following beneficial effects:

[0017] 1. In this utility model, connecting rods are installed inside the top stair section, the first middle stair section, the bottom stair section, and the second middle stair section. These connecting rods are then welded to the first mounting holes on the side plates via tenons and mortises on both sides, forming rigid connection nodes. This enhances the continuity of load transfer between stair sections. The force conversion of the tenon and mortise structure solves the problem of conventional steel structure welding failing to meet specifications. After the cantilevered steel staircase is assembled, the tenon and mortise joints, anti-torsion steel plates, connecting rods, and side plates together form a reasonable force-bearing system. This system effectively stabilizes the cantilevered steel staircase, resisting gravity and loads during use. It prevents disturbances caused by the cantilever from affecting walking safety and decorative effects, ensuring the safe use of the cantilevered steel staircase and guaranteeing its structural safety and aesthetics. This improves the connection of components in existing steel staircases, which are often directly welded on-site using carbon dioxide gas shielded welding, which is limited by the on-site construction environment and process stability, resulting in fluctuations in welding quality and insufficient safety assurance.

[0018] 2. In this utility model, the height of the temporary support pole is adjustable, which can adapt to different floor heights and stair cantilever lengths, and can flexibly build a support system in buildings with different floor heights; at the same time, the modular design of each stair section makes it easy to adjust the stair direction and shape according to the building space layout, meet diverse building needs, and can be adapted for installation in irregular art venues or commercial complexes with varying floor heights. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the side plate installation at the side plate of an ultra-large cantilever steel staircase structure proposed in this utility model;

[0020] Figure 2 This is a side view of the side panel of an ultra-large cantilevered steel staircase structure proposed in this utility model.

[0021] Figure 3 This is a partial three-dimensional structural diagram of the connecting plate of an ultra-large cantilever steel staircase proposed in this utility model;

[0022] Figure 4 This is a schematic diagram of the installation structure of the anti-torsion steel plate and sealing plate of the ultra-large cantilever steel staircase proposed in this utility model;

[0023] Figure 5 This is a three-dimensional structural diagram of an ultra-large cantilevered steel staircase structure proposed in this utility model;

[0024] Figure 6 This utility model proposes an ultra-large cantilevered steel structure staircase. Figure 5 Enlarged view of the structure at point A in the image;

[0025] Figure 7 This is a partial three-dimensional structural diagram of the connecting sleeve of an ultra-large cantilever steel staircase proposed in this utility model;

[0026] Figure 8 This is a partial three-dimensional structural diagram of the hanging lug of an ultra-large cantilever steel staircase proposed in this utility model;

[0027] Figure 9 This is a three-dimensional structural diagram of a limiting plate for an ultra-large cantilevered steel staircase proposed in this utility model.

[0028] Figure 10 This is a schematic diagram of the construction and hoisting of an ultra-large cantilevered steel staircase structure proposed in this utility model.

[0029] Legend:

[0030] 1. Connecting rod; 2. Side plate; 3. First mounting hole; 4. Second mounting hole; 5. Tenon and mortise head; 6. Sealing plate; 7. Support beam; 8. Anti-torsion steel plate; 9. Top stair section; 10. First floor platform; 11. Bottom stair section; 12. First middle stair section; 13. Upright; 14. Horizontal bar; 15. Limiting plate; 16. Hanging lug; 17. Connecting sleeve; 18. Adjusting handle; 19. Support rod; 20. Load-bearing plate; 21. Insertion hole; 22. Locking code; 23. Floor fixing plate; 24. Floor slab; 25. Cable; 26. Anti-detachment anchor bolt; 27. Connecting plate; 28. Second middle stair section; 29. ​​Second floor platform. Detailed Implementation

[0031] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1-5This utility model provides an embodiment of an ultra-large cantilever steel staircase structure, comprising a top stair section 9, a first middle stair section 12, a bottom stair section 11, and a second middle stair section 28. A connecting rod 1 is provided inside each of the top stair section 9, the first middle stair section 12, the bottom stair section 11, and the second middle stair section 28. Two side plates 2 are provided on each side of the connecting rod 1. A first mounting hole 3 and a second mounting hole 4 are provided in the middle of the side plates 2. A connecting plate 27 is provided between the two side plates 2 on one side of the connecting rod 1. Tenons 5 are provided on both sides of the connecting plate 27. The first mounting hole 3 is used to insert the tenons 5. The outer wall of the tenons 5 is welded to the inner wall of the first mounting hole 3. An anti-torsion steel plate 8 is provided at the junction of the bottom stair section 11 and the first middle stair section 12. The second mounting hole 4 is used to insert the anti-torsion steel plate 8. The outer wall of the anti-torsion steel plate 8 is welded to the inner wall of the second mounting hole 4. A handrail groove is provided on the top surface of the connecting plate 27.

[0033] Specifically, connecting rods 1 are evenly distributed on the top and bottom surfaces of the stair section. Connecting rods 1 connect the side panels 2 on both sides of the stair section and transfer loads from the side panels 2 to the ground. The side panels 2 transfer loads to the first floor platform 10 and the second floor platform 29. The first mounting hole 3 installs the tenon 5 and positions it. The second mounting hole 4 installs the anti-torsion steel plate 8. The tenon 5 engages with the first mounting hole 3, accurately and reliably fixing the two side panels 2 together. The outer wall of the tenon 5 is welded to the inner wall of the first mounting hole 3, thereby... The top plate 1 is further fixed to the side wall of the side plate 2; the anti-torsion steel plate 8 can increase the torsional resistance of the stair section, thereby improving safety; the handrail groove on the top surface of the connecting plate 27 allows the subsequent handrail to be directly inserted, making the handrail installation more convenient and stable; by setting connecting rods inside the top stair section, the first middle stair section, the bottom stair section and the second middle stair section, and welding the connecting rods with the first mounting holes of the side plate through tenons on both sides, a rigid connection node is formed, which enhances the continuity of load transfer between each stair section; thus improving the connection of the components of the existing steel structure staircase. Due to the common use of on-site carbon dioxide gas shielded welding for direct welding, the welding quality fluctuates and safety is insufficient due to the limitations of the on-site construction environment and process stability.

[0034] Please see the appendix Figure 1 -Appendix Figure 4 The bottom of the bottom stair section 11 is provided with a step positioning square steel, and the side of the step positioning square steel away from the bottom stair section 11 is fixedly connected to the ground.

[0035] Specifically, the bottom step positioning square steel set at the lower end of the bottom stair section 11 is fixed to the ground, providing a stable foundation support point for the staircase and effectively limiting the horizontal displacement and vertical settlement of the bottom stair section 11. At the same time, through precise positioning and installation, the overall installation accuracy of the staircase is ensured, so that the upper stair section and floor platform are connected to bear the force evenly, enhancing the load-bearing capacity and structural stability of the bottom of the super cantilever steel structure staircase.

[0036] Please see the appendix Figure 1 - Appendix Figure 5 The resting platform of the first middle section 12 is connected to the resting platform of the bottom section 11 by a connecting device. The high end of the first middle section 12 is fixedly connected to the edge of the first floor platform 10. The low end of the second middle section 28 is fixedly connected to the edge of the first floor platform 10. The resting platform of the second middle section 28 is connected to the resting platform of the top section 9 by a connecting device. The high end of the top section 9 is fixedly connected to the edge of the second floor platform 29. A support beam 7 is provided inside the resting platform.

[0037] Specifically, this fixed connection method between the stair flights and the floor platforms achieves stable force transmission in the ultra-large cantilever steel staircase structure system. Each stair flight is fixed at multiple points, effectively transferring vertical and horizontal loads to the floor platforms, dispersing structural stress, and avoiding stress concentration at single points. At the same time, the components constrain each other to form a whole, enhancing the spatial stability and lateral displacement resistance of the staircase structure, ensuring structural safety under ultra-large cantilever conditions, and ensuring that the staircase meets mechanical performance requirements and design standards during use. The support beam 7, as the main load-bearing skeleton of the rest platform, directly bears the vertical loads of personnel and equipment and transfers them to the main structure of the stair flights. Through its synergistic effect with the connecting rod 1 and the anti-torsion steel plate 8, it enhances the in-plane stiffness of the rest platform and suppresses bending and torsional deformation under cantilever conditions.

[0038] Please see the appendix Figure 1 - Appendix Figure 5 The connecting device includes a sealing plate 6 and an anti-torsion steel plate 8. The sealing plate 6 is located on the side of the rest platform away from the stair section, and the anti-torsion steel plate 8 is located inside the rest platform on the side closer to the stair section. A connecting plate 27 is provided in the middle of the two sealing plates 6, and a first mounting hole 3 is opened in the middle of the sealing plate 6.

[0039] Specifically, the load of the resting platform is transferred to the connecting rod 1 and adjacent stair sections by welding the first mounting hole 3 in the middle to the tenon 5 of the connecting plate 27, thereby enhancing the structural continuity. It works in conjunction with the anti-torsion steel plate 8 to form a closed anti-torsion frame, improving the torsional resistance of the resting platform, especially suppressing deformation under ultra-large cantilever conditions. As a component of the connecting structure, it works with the anti-torsion steel plate 8 to achieve a reliable connection between the first middle stair section 12 and the bottom stair section 11, and between the second middle stair section 28 and the top stair section 9, simplifying the on-site installation process.

[0040] Please see the appendix Figure 5 -Appendix Figure 10 Temporary support devices are provided on the side of the top stair section 9, the first middle stair section 12, the bottom stair section 11, and the second middle stair section 28 away from the second floor platform 29 and the first floor platform 10. Hoisting devices are provided on the top of the top stair section 9, the first middle stair section 12, the bottom stair section 11, and the second middle stair section 28.

[0041] Specifically, temporary support devices provide lateral and vertical support to the top stair section 9, the first middle stair section 12, the bottom stair section 11, and the second middle stair section 28 during installation, offsetting the bending moment and deformation caused by the self-weight of the cantilever structure and construction loads, ensuring the structural stability of the staircase before it is fixed to the second floor platform 29 and the first floor platform 10; hoisting devices enable the safe lifting, precise positioning, and installation of each stair section, ensuring the stability and safety of the stair sections during construction.

[0042] Please see the appendix Figure 5 The temporary support device includes uprights 13 and crossbars 14. Multiple uprights 13 and crossbars 14 are fixed by a connecting structure. The top surface of the bottom crossbar 14 is located at the bottom surface of the high end of the bottom stair section 11, and the top surface of the high end crossbar 14 is located at the bottom surface of the low end of the top stair section 9.

[0043] Specifically, the upright 13 serves as a vertical load-bearing component of the temporary support device, used to transfer the load from the bottom crossbar 14 to the ground, providing vertical support for the high end of the bottom stair section 11 and the low end of the top stair section 9; the crossbar 14 is horizontally arranged between the uprights 13, forming a temporary support frame together with the uprights 13, providing horizontal constraint and vertical support for the high end of the bottom stair section 11 and the low end of the top stair section 9, effectively resisting lateral displacement and deformation caused by the cantilever of the stair section; the uprights 13 and the crossbar 14 can be quickly and securely connected through the connecting structure.

[0044] Please see the appendix Figure 5 -Appendix Figure 9 The connecting structure includes a hanging ear 16, the end of which is fixedly connected to the outer wall of the upright 13. A through hole is provided in the middle of the hanging ear 16. A connecting sleeve 17 is fixedly connected to the end of the crossbar 14. An insertion hole 21 is provided on the top and bottom surfaces of the connecting sleeve 17. The distance between the top and bottom surfaces of the connecting sleeve 17 is equal to the height of the hanging ear 16. A limiting plate 15 is provided between the hanging ear 16 and the connecting sleeve 17. The limiting plate 15 is located inside both the through hole of the hanging ear 16 and the insertion hole 21. The bottom length of the limiting plate 15 is less than the top length, and the side of the limiting plate 15 is triangular.

[0045] Specifically, the lug 16 is fixed to the outer wall of the upright 13, and its through hole corresponds to the insertion hole 21 of the connecting sleeve 17 at the end of the horizontal bar 14, for inserting the limiting plate 15 to achieve quick positioning and connection between the upright 13 and the horizontal bar 14; the lug 16 transfers the load on the horizontal bar 14 to the upright 13, enhancing the structural integrity and connection reliability of the temporary support device, and ensuring stable force transmission of the support system during stair installation; the connecting sleeve 17 is fixed to the end of the horizontal bar 14, and its top and bottom insertion holes 21 correspond to the through holes of the lug 16 on the upright 13, for inserting the limiting plate 15 to achieve quick positioning and connection between the horizontal bar 14 and the upright 13. The system enables rapid assembly and fixation; simultaneously, the connecting sleeve 17, as a force transmission component, transfers the load borne by the horizontal bar 14 to the vertical bar 13, ensuring the overall stability and connection strength of the temporary support device and ensuring effective support of the stair section during the installation of the ultra-large cantilever steel structure staircase; the limiting plate 15 is inserted into the through hole of the hanging ear 16 and the insertion hole 21 of the connecting sleeve 17, limiting the relative displacement of the vertical bar 13 and the horizontal bar 14, realizing a rapid and stable connection of the temporary support device. Its triangular structure with a narrow bottom and a wide top forms a self-locking effect, preventing the connecting parts from loosening, ensuring reliable force transmission of the support system during the staircase installation process, and improving the overall structural stability.

[0046] Please see the appendix Figure 5 - Appendix Figure 6 The bottom of the upright 13 is hollow, and a support rod 19 is installed inside the upright 13. An adjustment handle 18 is installed at the bottom of the upright 13. The inner wall of the middle part of the adjustment handle 18 is provided with an internal thread, and the outer wall of the support rod 19 is provided with an external thread. The external thread of the outer wall of the support rod 19 and the internal thread of the inner wall of the middle part of the adjustment handle 18 are engaged with each other. The bottom of the support rod 19 is fixedly connected to the top surface of the force plate 20.

[0047] Specifically, the hollow structure at the bottom of the upright 13 provides installation space for the internal support rod 19 and adjustment handle 18. The support height of the upright 13 can be flexibly adjusted by adjusting the threaded engagement between the adjustment handle 18 and the support rod 19. At the same time, the hollow design reduces the weight of the upright 13, making it easier to handle and install on site, and can adapt to different ground conditions, enhancing the versatility and stability of the temporary support device. The load-bearing plate 20 is set at the bottom of the support rod 19, increasing the contact area between the upright 13 and the ground, evenly distributing the load transmitted by the upright 13, and preventing local pressure deformation of the ground. It also provides a stable support surface, enhancing the overall anti-overturning capacity of the temporary support device, and ensuring the stability and reliability of the support system during the installation of the ultra-large cantilever steel structure staircase.

[0048] Please see the appendix Figure 10The hoisting device includes a floor fixing plate 23, the bottom surface of which is set on the top surface of the floor slab 24. Anti-detachment anchor bolts 26 are set on both sides of the floor fixing plate 23, and the anti-detachment anchor bolts 26 pass through both the floor fixing plate 23 and the floor slab 24. A locking code 22 is set in the middle of the floor fixing plate 23. The bottom of the locking code 22 is set at one end of the cable 25. The other end of the cable 25 is tied to the center of gravity of the top ladder section 9, the first middle ladder section 12, the bottom ladder section 11, and the second middle ladder section 28.

[0049] Specifically, the floor fixing plate 23 serves as the basic load-bearing component of the hoisting device. Its bottom surface is in contact with the top surface of the floor slab 24, providing a connection plane with the main building and providing an installation carrier for the entire hoisting system, ensuring that the hoisting force can be effectively transmitted to the floor slab 24. The anti-detachment anchor bolt 26 penetrates the floor fixing plate 23 and the floor slab 24, firmly anchoring the floor fixing plate 23 to the floor slab 24, preventing the fixing plate 23 from detaching from the floor slab 24 during hoisting, ensuring a reliable connection between the hoisting device and the main building, and improving the overall pull-out and shear resistance. The locking clip 22 is located in the middle of the floor fixing plate 23 to fix one end of the cable 25, providing a reliable rope connection node to ensure that the cable 25 will not come loose from the floor fixing plate 23 during hoisting, thus ensuring the stable transmission of hoisting force. One end of the cable 25 is connected to the locking clip 22, and the other end is tied to the center of gravity of the top stair section 9, the first middle stair section 12, the bottom stair section 11, and the second middle stair section 28. The flexible characteristics are used to transmit hoisting force, so that the stair sections remain balanced during hoisting, avoiding tilting or swaying, and achieving precise hoisting.

[0050] Working principle: By opening the first mounting hole 3 in the middle of the side plate 2, the tenon 5 of the connecting plate 27 is inserted into the interior of the first mounting hole 3, thereby enabling the side plate 2 to be quickly positioned and fixed. Then, the tenon 5 inside the first mounting hole 3 is welded to make the outer wall of the tenon 5 firmly connected to the inner wall of the first mounting hole 3.

[0051] The connecting sleeves 17 at both ends of the crossbar 14 are installed at the ends of the hanging ears 16. Then, the limiting plate 15 is inserted from the insertion hole 21 and passes through the inside of the hanging ears 16, so that the crossbar 14 and the upright 13 can be quickly connected. The height of the upright 13 can be adjusted by rotating the adjusting handle 18. Then, the crossbar 14 and the upright 13 are connected to form supports of different heights, thereby supporting the suspended sections of the first middle section 12, the bottom section 11, the second middle section 28 and the top section 9.

[0052] The floor fixing plate 23 is stably installed on the top surface of the floor slab 24 using the anti-detachment anchor bolt 26. Then, the cable 25 is fixed using the locking clip 22, and then the cable 25 is used to support and lift the first middle section 12, the bottom section 11, the second middle section 28 and the top section 9.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A super-large cantilevered steel staircase structure, comprising a top stair section (9), a first middle stair section (12), a bottom stair section (11), and a second middle stair section (28), characterized in that: The top stair section (9), the first middle stair section (12), the bottom stair section (11) and the second middle stair section (28) are provided with connecting rods (1). Each side of the connecting rod (1) is provided with two side plates (2). The middle of the side plate (2) is provided with a first mounting hole (3) and a second mounting hole (4). A connecting plate (27) is provided between the two side plates (2) on one side of the connecting rod (1). The two sides of the connecting plate (27) are provided with tenons (5). The first mounting hole (3) is used to insert the tenons (5). The outer wall of the tenons (5) is welded to the inner wall of the first mounting hole (3). The bottom stair section (11) and the first middle stair section (12) are provided with anti-torsion steel plates (8). The second mounting hole (4) is used to insert the anti-torsion steel plates (8). The outer wall of the anti-torsion steel plates (8) is welded to the inner wall of the second mounting hole (4). The top surface of the connecting plate (27) has a handrail groove.

2. The ultra-large cantilevered steel staircase structure according to claim 1, characterized in that: The bottom section (11) is provided with a step positioning square steel at its lower end, and the side of the step positioning square steel away from the bottom section (11) is fixedly connected to the ground.

3. The ultra-large cantilevered steel staircase structure according to claim 1, characterized in that: The resting platform of the first middle section (12) is connected to the resting platform of the bottom section (11) by a connecting device. The high end of the first middle section (12) is fixedly connected to the edge of the first floor platform (10). The low end of the second middle section (28) is fixedly connected to the edge of the first floor platform (10). The resting platform of the second middle section (28) is connected to the resting platform of the top section (9) by a connecting device. The high end of the top section (9) is fixedly connected to the edge of the second floor platform (29). The resting platform is provided with a support beam (7).

4. The ultra-large cantilevered steel staircase structure according to claim 3, characterized in that: The connecting device includes a sealing plate (6) and an anti-torsion steel plate (8). The sealing plate (6) is located on the side of the rest platform away from the ladder section, and the anti-torsion steel plate (8) is located inside the rest platform on the side close to the ladder section. A connecting plate (27) is provided in the middle of the two sealing plates (6), and a first mounting hole (3) is provided in the middle of the sealing plate (6).

5. The ultra-large cantilevered steel staircase structure according to claim 4, characterized in that: Temporary support devices are provided on the side of the top stair section (9), the first middle stair section (12), the bottom stair section (11) and the second middle stair section (28) away from the second floor platform (29) and the first floor platform (10). Hoisting devices are provided on the top of the top stair section (9), the first middle stair section (12), the bottom stair section (11) and the second middle stair section (28).

6. The ultra-large cantilevered steel staircase structure according to claim 5, characterized in that: The temporary support device includes uprights (13) and crossbars (14). Multiple uprights (13) and crossbars (14) are fixed by a connecting structure. The top surface of the bottom crossbar (14) is located at the bottom surface of the upper end of the bottom stair section (11), and the top surface of the upper crossbar (14) is located at the bottom surface of the lower end of the top stair section (9).

7. The ultra-large cantilevered steel staircase structure according to claim 6, characterized in that: The connection structure includes a hanging ear (16), the end of which is fixedly connected to the outer wall of the upright (13). A through hole is provided in the middle of the hanging ear (16). A connecting sleeve (17) is fixedly connected to the end of the crossbar (14). An insertion hole (21) is provided on the top and bottom surfaces of the connecting sleeve (17). The distance between the top and bottom surfaces of the connecting sleeve (17) is equal to the height of the hanging ear (16). A limiting plate (15) is provided between the hanging ear (16) and the connecting sleeve (17). The limiting plate (15) is located inside both the through hole of the hanging ear (16) and the insertion hole (21). The bottom length of the limiting plate (15) is less than the top length. The side of the limiting plate (15) is triangular.

8. A super-large cantilevered steel staircase structure according to claim 6, characterized in that: The bottom of the upright (13) is hollow. A support rod (19) is provided inside the upright (13). An adjustment handle (18) is provided at the bottom of the upright (13). The inner wall of the middle part of the adjustment handle (18) is provided with an internal thread. The outer wall of the support rod (19) is provided with an external thread. The external thread of the outer wall of the support rod (19) and the internal thread of the inner wall of the middle part of the adjustment handle (18) mesh with each other. The bottom of the support rod (19) is fixedly connected to the top surface of the force plate (20).

9. A super-large cantilevered steel staircase structure according to claim 5, characterized in that: The hoisting device includes a floor fixing plate (23), the bottom surface of which is set on the top surface of the floor slab (24). Anti-detachment anchor bolts (26) are provided on both sides of the floor fixing plate (23). The anti-detachment anchor bolts (26) pass through the floor fixing plate (23) and the floor slab (24). A locking code (22) is provided in the middle of the floor fixing plate (23). The bottom of the locking code (22) is set at one end of the cable (25). The other end of the cable (25) is tied to the center of gravity of the top ladder section (9), the first middle ladder section (12), the bottom ladder section (11), and the second middle ladder section (28).

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