Prefabricated steel structure stair and assembling method thereof

Abstract

This invention relates to a prefabricated steel structure staircase and its assembly method, specifically within the technical field of prefabricated steel structure staircases. The invention addresses the problems of existing steel structure staircases, which require on-site welding, resulting in low construction efficiency, high labor costs, and cumbersome transportation due to their long length, necessitating the use of large hoisting equipment and incurring high operating costs. The invention comprises multi-layered stair column assemblies and multi-layered staircase assemblies. The multi-layered stair column assemblies are arranged sequentially from bottom to top along the outer end of the frame assembly. The stair column assemblies are fixed to the outer end of the frame assembly via TU snap-fit ​​nodes. Each layer of stair column assemblies is fixedly connected to one layer of staircase assembly. Each layer of staircase assembly includes a landing assembly, a lower stair flight assembly, and an upper stair flight assembly. The landing assembly is connected to the stair column assembly via TB or UT nodes. This invention is used for building connections.

Description

Technical Field

[0001] This invention relates to the field of prefabricated steel structure staircase technology, specifically to a prefabricated steel structure staircase and its assembly method. Background Technology

[0002] Prefabricated steel structure staircases, as an important means of transportation within prefabricated buildings, offer advantages such as short construction cycles, high construction safety, low labor requirements, lightweight and modular structures, and ease of disassembly and recycling. They reduce construction waste, improve the ecological and environmental benefits of building projects, and align with the strategic requirements of sustainable industrial development. However, current conventional prefabricated steel structure staircases, both domestically and internationally, have the following shortcomings:

[0003] 1. At present, in actual engineering projects, most new prefabricated steel structure staircases at home and abroad require hoisting during installation due to the large weight of individual components, which makes the construction work more difficult and the construction efficiency lower.

[0004] 2. At present, in actual engineering projects, most of the new prefabricated steel structure staircases at home and abroad adopt welding for their treads and rest platforms. The assembled components are mostly concentrated in the staircase section, and some welding phenomena still exist on site.

[0005] 3. At present, some new prefabricated steel structure staircases at home and abroad have not considered the construction error problem in their node design, which leads to construction difficulties in actual application.

[0006] 4. At present, most steel structure staircases are constructed by on-site welding, which makes it difficult to guarantee welding quality, requires high technical skills from welders, and requires additional weld quality inspection procedures, which seriously affects the construction speed. At the same time, welding residual stress and residual strain are uncontrollable. Summary of the Invention

[0007] To address the problems of existing steel structure staircases requiring on-site welding, resulting in low construction efficiency, high labor costs, long staircase lengths, cumbersome transportation processes, and the need for large hoisting equipment, this invention proposes a prefabricated steel structure staircase and its assembly method.

[0008] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0009] A prefabricated steel structure staircase includes a multi-layer stair column assembly and a multi-layer stair assembly. The multi-layer stair column assembly is arranged sequentially from bottom to top along the outer end of the frame assembly. The stair column assembly is fixed to the outer end of the frame assembly through TU snap-fit ​​nodes. Each layer of stair column assembly is fixed with a layer of stair assembly.

[0010] Each staircase assembly includes a landing assembly, a lower staircase assembly, and an upper staircase assembly. The landing assembly is connected to the stair column assembly via TB or UT nodes. The lower end of the lower staircase assembly is fixed to the inner end of the frame assembly via TU snap-fit ​​nodes. The upper end of the lower staircase assembly is fixed to one side of the landing assembly via UT nodes. The lower end of the upper staircase assembly is fixed to the other side of the landing assembly via UT nodes. The upper end of the upper staircase assembly is fixed to the inner end of the frame assembly via TU snap-fit ​​nodes.

[0011] Furthermore, each layer of the stair column assembly includes two upper side stair columns and two upper middle stair columns. The two upper side stair columns are vertically arranged on both sides of the corresponding rest platform assembly, and the middle part of the upper side stair columns is fixedly connected to both sides of the rest platform assembly. The two upper middle stair columns are vertically arranged in the middle of the corresponding rest platform assembly, and the top of the upper middle stair columns is fixedly connected to the middle of the rest platform assembly. The lower end of the upper side stair column of the upper layer, the lower end of the upper middle stair column of the upper layer, and the upper end of the upper side stair column of the lower layer are fixedly connected to the same frame beam at the outer end of the frame assembly.

[0012] Furthermore, the rest platform assembly includes a middle rest platform plate, a middle angle steel keel, a connecting beam, two main rest platform plates, and two main steel keels. The connecting beam includes two rest platform beams one, two rest platform beams two, and two rest platform beams three. The two rest platform beams one are arranged side by side on both sides, and one end of each rest platform beam one is fixed to an upper side stair column through a TB node. The two rest platform beams two are arranged side by side in the middle, and one end of each rest platform beam two is fixed to an upper middle stair column through a TB node. A rest platform beam three is arranged between the rest platform beams one and two. One end of each rest platform beam three is fixed to an upper side stair column through a TB node, and the other end of each rest platform beam three is fixed to an upper middle stair column through a TB node.

[0013] The main steel keel is set between rest platform beam one and rest platform beam two. The outer edge of the main steel keel overlaps on rest platform beam one, rest platform beam two and rest platform beam three. Two adjusting bolts are symmetrically screwed on each side of the main steel keel. The outer end of the adjusting bolt matches the inner end face of rest platform beam one or rest platform beam two. The main rest platform plate is fixed to the upper end face of the main steel keel. The intermediate angle steel keel is set in parallel between the two rest platform beam two. A channel steel keel is fixed to one side between the two intermediate angle steel keels. The outer edge of the intermediate angle steel keel overlaps on rest platform beam two. The intermediate rest platform plate is fixed to the upper end face of the intermediate angle steel keel.

[0014] Furthermore, the TB node includes a beam end plate, an upper connecting plate, a lower connecting plate, an upper T-shaped connecting assembly, and a lower rectangular connecting assembly. The beam end plate is vertically fixed to the connecting port of the connecting beam. The upper T-shaped connecting assembly is vertically fixed to the upper part of the outer end face of the beam end plate, and the lower rectangular connecting assembly is vertically fixed to the lower part of the outer end face of the beam end plate. The upper T-shaped connecting assembly and the lower rectangular connecting assembly are vertically fixed together. The upper connecting plate is vertically fixed to the connecting side wall of the connecting column. The lower connecting plate is horizontally fixed to the connecting side wall of the ladder column assembly. The lower connecting plate is located below the upper connecting plate. The upper connecting plate and the upper T-shaped connecting assembly are fixed together by upper connecting bolts. The lower rectangular connecting assembly is located between the upper connecting plate and the lower connecting plate, and the lower connecting plate and the lower rectangular connecting assembly are fixed together by lower connecting bolts.

[0015] Furthermore, both the lower and upper stair section components include two lower stair section components and two upper stair section components. Both the lower and upper stair section components are inclined from bottom to top, and are arranged parallel to each other. Each lower stair section component includes a lower rectangular steel pipe stair beam, a lower step overlap plate, a lower handrail, and a lower railing assembly. Each upper stair section component includes an upper rectangular steel pipe stair beam, an upper step overlap plate, an upper handrail, and an upper railing assembly. The lower end of the lower rectangular steel pipe stair beam in the lower stair section component is fixed to the frame beam via a TU snap-fit ​​joint. The upper end of the upper rectangular steel pipe stair beam in the lower stair section component is fixed to the connecting beam via a UT joint. The lower end of the lower rectangular steel pipe stair beam in the upper stair section component is fixed to the connecting beam via a UT joint. In the staircase assembly, the upper end of the upper rectangular steel pipe staircase beam is fixed to the frame beam via a TU snap-fit ​​joint. The upper end of the lower rectangular steel pipe staircase beam is fixed to the lower end of the upper rectangular steel pipe staircase beam via a UT joint. The lower step overlap plate is fixed to the inner side of the lower rectangular steel pipe staircase beam. The lower handrail is parallel to the upper end of the lower rectangular steel pipe staircase beam and is fixed to the lower rectangular steel pipe staircase beam via a lower railing assembly. The upper step overlap plate is fixed to the inner side of the upper rectangular steel pipe staircase beam. The upper handrail is parallel to the upper end of the upper rectangular steel pipe staircase beam and is fixed to the upper rectangular steel pipe staircase beam via an upper railing assembly. The upper end of the lower handrail is fixed to the lower end of the upper handrail via a handrail connecting assembly. Step plates are fixed between the two lower step overlap plates and the two upper step overlap plates.

[0016] Furthermore, the TU snap-fit ​​node includes a U-shaped connecting plate, two T-shaped connecting plates, four sets of adjusting angle steel, four sets of connecting bolts, and four sets of fastening bolts. The vertical ends of the two T-shaped connecting plates are vertically opposite each other on both sides of the web of the middle beam of the frame beam. Each T-shaped connecting plate has a set of adjusting angle steel on the upper and lower sides of its vertical end. Each set of adjusting angle steel includes two opposing adjusting angle steels, which are respectively located on the front and rear sides of the vertical end of the T-shaped connecting plate. Each set of adjusting angle steels is fixed to each other by a set of connecting bolts. The open ends of the two U-shaped connecting plates are opposite each other and fitted onto the outer sides of the upper and lower end flanges of the frame beam. The sidewalls of the U-shaped connecting plates are located on the outer sides of the horizontal ends of the T-shaped connecting plates, and the sidewalls of the U-shaped connecting plates are fixed to the horizontal ends of the T-shaped connecting plates by a set of fastening bolts.

[0017] Furthermore, the UT node includes a rear end plate, a front end plate, a connecting end plate, a lower connecting plate, an upper connecting bolt, an upper connecting assembly, a lower connecting assembly, two side end plates, and a lower connecting bolt. The rear end plate is vertically fixed to the connecting part of a connector. The front end plate is parallel to the outside of the rear end plate. The upper part between the front end plate and the rear end plate is fixed through the upper connecting assembly. The lower part between the front end plate and the rear end plate is fixed through the lower connecting assembly. The connecting end plate is vertically fixed to the connecting part of another connector. The lower connecting plate is horizontally fixed to the outside of the lower end of the connecting end plate. The upper part of the front end plate is fixed to the outer end face of the connecting end plate through the upper connecting bolt. The lower connecting assembly is fixed to the upper end face of the lower connecting plate through the lower connecting bolt. The upper connecting assembly is shaped like a "U" and the lower connecting assembly is shaped like an inverted "T".

[0018] Furthermore, the handrail connecting assembly includes a first handrail connecting plate, a second handrail connecting plate, a first handrail sealing plate, a second handrail sealing plate, a U-shaped sealing plate, and a set of handrail connecting bolts. The first handrail sealing plate is fixed to the port of one handrail connecting end, and the second handrail sealing plate is fixed to the port of the other handrail connecting end. The first handrail connecting plate and the second handrail connecting plate are arranged parallel to each other between the first handrail sealing plate and the second handrail sealing plate. The inner end of the first handrail connecting plate is perpendicularly fixed to the outer end face of the first handrail sealing plate, and the inner end of the second handrail connecting plate is perpendicularly fixed to the outer end face of the second handrail sealing plate. The first handrail connecting plate and the second handrail connecting plate are fixed together by a set of handrail connecting bolts. The open end of the U-shaped sealing plate is fixed downwards to the upper part between the first handrail sealing plate and the second handrail sealing plate, and a connecting sealing plate is fixed to the lower open end of the U-shaped sealing plate.

[0019] Furthermore, a platform handrail is provided parallel to the upper end of the first rest platform beam, and the platform handrail is fixedly connected to the first rest platform beam through a platform railing assembly.

[0020] An assembly method for a prefabricated steel structure staircase includes the following steps:

[0021] Step 1: Install the lower stair section component of the lower stair section assembly, the upper stair section component of the upper stair section assembly, and the stair column assembly: First, fix the lower stair section component of the lowest-level lower stair section assembly to the stair section foundation. Then, use TU snap-fit ​​joints to fix the lower stair section component of the lower stair section assembly and the upper stair section component of the upper stair section assembly to the frame beam. Next, fix the lower end of the bottom side stair column to the stair column foundation. Finally, use TU snap-fit ​​joints to fix the upper side stair column and the upper middle stair column to the frame beam.

[0022] Step 2: Install the upper stair section component in the lower stair section assembly and the lower stair section component in the upper stair section assembly: First, fix the upper stair section component in the lower stair section assembly to the lower stair section component in the lower stair section assembly through UT nodes. Then, fix the lower stair section component in the upper stair section assembly to the upper stair section component in the upper stair section assembly through UT nodes. Finally, fix the lower handrail and the upper handrail together through the handrail connecting components.

[0023] Step 3: Install connecting beams: First, fix one end of rest platform beam 1 and rest platform beam 2 to the stair column assembly through TB ​​nodes. Then, fix the other end of rest platform beam 1 and rest platform beam 2 to the upper stair section assembly and the lower stair section assembly in the lower stair section assembly respectively through UT nodes. Finally, fix rest platform beam 3 to the stair column assembly through TB ​​nodes.

[0024] Step 4: Install the step treads, rest platform treads, corner railing assemblies, and top-level corner railing assemblies: First, fix the step treads to the two lower step overlap plates and the two upper step overlap plates using step bolts. Then, overlap the prefabricated intermediate rest platform treads and intermediate angle steel keels onto the connecting beam. Overlap the prefabricated main rest platform treads and main steel keels onto the connecting beam and fix them to the connecting beam by tightening the adjusting bolts. Next, fix the corner railing assemblies to the channel steel keels. Fix the handrail connecting ear plates in the corner railing assemblies to the upper and lower handrails respectively using bolts. Finally, fix the top-level corner railing assemblies to the frame beam using TU snap fasteners.

[0025] The beneficial effects of this invention compared to the prior art are:

[0026] 1. This prefabricated steel structure staircase adopts a fully bolted, weld-free connection method on site, which does not require professional welding construction personnel and is in line with the current development strategy of green building and energy conservation, carbon reduction and emission reduction.

[0027] 2. Each component of this prefabricated steel structure staircase is short and lightweight, allowing it to be transported via construction elevators without the need for hoisting, simplifying installation and greatly improving construction efficiency.

[0028] 3. Adjustable construction error: Error adjustment is performed through TB ​​nodes during on-site installation to ensure construction feasibility.

[0029] 4. Wide range of applications: This prefabricated steel structure staircase is a complete structural system that can be applied to frame structures of various sizes by changing the size of the components. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a partially enlarged view of the overall structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the lower ladder segment component in the lower ladder segment component of the present invention;

[0033] Figure 4 This is a schematic diagram of the upper section of the lower section component in this invention;

[0034] Figure 5 This is a schematic diagram of the structure of the lower section of the upper section component in this invention;

[0035] Figure 6 This is a schematic diagram of the structure of the upper ladder segment component in the upper ladder segment component of the present invention;

[0036] Figure 7 This is a schematic diagram of the structure of the platform armrest 27 in this invention;

[0037] Figure 8 This is a schematic diagram of the upper middle ladder column 6 in this invention;

[0038] Figure 9 This is a schematic diagram of the structure of the step plate 29 in this invention;

[0039] Figure 10 This is a schematic diagram of the structure of the step bolt 38 in this invention;

[0040] Figure 11 This is a schematic diagram of the structure of the intermediate rest platform plate 11 and the intermediate rest platform plate 11 when they are fixed together in this invention;

[0041] Figure 12 This is a schematic diagram of the structure of the intermediate rest platform plate 11 in this invention;

[0042] Figure 13 This is a schematic diagram of the structure of the intermediate rest platform plate 11 in this invention;

[0043] Figure 14 This is a schematic diagram of the structure when the main resting platform plate 13 and the main steel keel 14 are fixed together in this invention;

[0044] Figure 15 This is a structural schematic diagram of the main component, the steel keel 14, in this invention;

[0045] Figure 16 This is a schematic diagram of the structure of the main rest platform plate 13 in this invention;

[0046] Figure 17 This is a schematic diagram of the structure of the main steel keel 14 in this invention when it is fixed by adjusting bolts 18;

[0047] Figure 18 This is a structural schematic diagram of the corner railing assembly in this invention;

[0048] Figure 19 This is a schematic diagram of the installation of the corner railing assembly in this invention;

[0049] Figure 20 This is a schematic diagram of the top-level corner railing assembly in this invention;

[0050] Figure 21 This is a disassembled diagram of TB node 9 in this invention;

[0051] Figure 22 This is a right view of the node portion of the connecting beam when the lower flange bolt hole 9-4-1 of TB node 9 has an internal thread.

[0052] Figure 23 This is a right view of the node portion of the connecting beam when the interior of the lower flange bolt hole 9-4-1 of TB node 9 is a smooth hole in this invention;

[0053] Figure 24 This is a schematic diagram of the TU snap-fit ​​node 8 when the ladder column assembly is connected to the frame assembly in this invention;

[0054] Figure 25 This is a schematic diagram of the TU snap-fit ​​node 8 when the upper ladder section component is connected to the frame component in this invention;

[0055] Figure 26 This is a schematic diagram of the structure of the U-shaped connecting plate 8-1 in this invention;

[0056] Figure 27 This is a schematic diagram of the T-shaped connecting plate 8-2 in this invention;

[0057] Figure 28 This is a schematic diagram of the structure of the adjusting angle steel 8-3 in this invention;

[0058] Figure 29 This is a schematic diagram of the structure of one end of UT node 10 in this invention;

[0059] Figure 30This is a schematic diagram of the structure of the other end of UT node 10 in this invention;

[0060] Figure 31 This is a right view of the node portion of the connecting beam when the upper bolt hole 10-6-1 of the UT node 10 in this invention has an internal thread;

[0061] Figure 32 This is a right view of the node portion of the connecting beam when the interior of the upper bolt hole 10-6-1 of the UT node 10 is a smooth hole in this invention;

[0062] Figure 33 This is an anatomical diagram of the first handrail connecting plate 30-1 and the second handrail connecting plate 30-2 in this invention;

[0063] Figure 34 This is an assembly diagram of the first handrail connecting plate 30-1 and the second handrail connecting plate 30-2 in this invention;

[0064] Figure 35 This is a disassembly diagram of the U-shaped sealing plate 30-4 and the connecting sealing plate 30-7 in this invention;

[0065] Figure 36 This is a schematic diagram of the structure of the handrail connecting component 30 in this invention;

[0066] Figure 37 This is a schematic diagram of the structure after installing the lower stair section component in the lower stair section component, the upper stair section component in the upper stair section component, and the stair column component in the present invention;

[0067] Figure 38 This is a schematic diagram of the structure after installing the upper section of the lower section assembly and the lower section assembly of the upper section assembly in this invention;

[0068] Figure 39 This is a schematic diagram of the structure for installing the connecting beam in this invention;

[0069] Figure 40 This is a structural schematic diagram of the installation of step 29, rest platform plate, and corner railing assembly in this invention. Detailed Implementation

[0070] Specific implementation method one: Combining Figures 1 to 40 This embodiment describes a prefabricated steel structure staircase, which includes a multi-layer stair column assembly and a multi-layer staircase assembly. The multi-layer stair column assembly is arranged sequentially from bottom to top along the outer end of the frame assembly. The stair column assembly is fixedly connected to the outer end of the frame assembly through TU snap-fit ​​nodes 8. Each layer of stair column assembly is fixedly connected to a layer of staircase assembly.

[0071] Each staircase assembly includes a landing assembly, a lower staircase assembly, and an upper staircase assembly. The landing assembly is connected to the stair column assembly via TB node 9 or UT node 10. The lower end of the lower staircase assembly is fixed to the inner end of the frame assembly via TU snap-fit ​​node 8. The upper end of the lower staircase assembly is fixed to one side of the landing assembly via UT node 10. The lower end of the upper staircase assembly is fixed to the other side of the landing assembly via UT node 10. The upper end of the upper staircase assembly is fixed to the inner end of the frame assembly via TU snap-fit ​​node 8.

[0072] The frame mechanism is used to fix the staircase and provides a structural reserve for the building. The frame mechanism includes four frame columns 1 and multiple frame beams 2. The four frame columns 1 are arranged vertically and symmetrically. Multiple frame beams 2 are evenly distributed from bottom to top between two frame columns 1 on each rectangular surface. The frame beams 2 are arranged horizontally and are welded to the frame columns 1.

[0073] Specific Implementation Method Two: Combining Figures 1 to 40 This embodiment describes a staircase assembly where each floor includes two upper-level side staircases 5 and two upper-level middle staircases 6. The two upper-level side staircases 5 are vertically arranged on both sides of the corresponding rest platform assembly, with their middle portions fixed to the sides of the rest platform assembly. The two upper-level middle staircases 6 are vertically arranged in the middle of the corresponding rest platform assembly, with their top ends fixed to the middle of the rest platform assembly. The lower ends of the upper-level side staircases 5, the lower ends of the upper-level middle staircases 6, and the upper ends of the lower-level side staircases 5 are fixed to the same frame beam 2 on the outer side of the frame assembly. Undisclosed technical features in this embodiment are the same as in specific embodiment one.

[0074] The bottom-level staircase column assembly includes two bottom-level side staircase columns 3 and two bottom-level middle staircase columns 4. The two bottom-level side staircase columns 3 are vertically arranged on both sides of the bottom-level rest platform assembly, and the middle part of the bottom-level side staircase columns 3 is fixedly connected to both sides of the bottom-level rest platform assembly. The two bottom-level middle staircase columns 4 are vertically arranged in the middle of the bottom-level rest platform assembly, and the top of the bottom-level middle staircase columns 4 is fixedly connected to the middle of the bottom-level rest platform assembly. The lower ends of the bottom-level side staircase columns 3 and the lower ends of the bottom-level middle staircase columns 4 are both fixedly connected to staircase column foundations 7.

[0075] The upper ends of the two upper intermediate stair columns 6 and the upper ends of the two lower intermediate stair columns 4 are both fixedly connected by connecting pipe columns 37.

[0076] The stair column foundation 7 includes a concrete foundation, foundation embedded parts, and embedded part connecting steel plates. The foundation embedded parts are fixed to the upper end surface of the concrete foundation. Multiple anchor bars are evenly distributed and fixed to the lower end surface of the foundation embedded parts. The anchor bars are set inside the concrete foundation. Multiple anchor bolts are evenly distributed and fixed to the upper end surface of the foundation embedded parts. The embedded part connecting steel plates are set on the foundation embedded parts and are fixed to the foundation embedded parts through anchor bolts.

[0077] Specific implementation method three: Combining Figures 1 to 40 This embodiment describes a rest platform assembly comprising a central rest platform slab 11, a central angle steel keel 12, a connecting beam, two main rest platform slabs 13, and two main steel keels 14. The connecting beams include two rest platform beams 15, two rest platform beams 26, and two rest platform beams 37. The two rest platform beams 15 are arranged side by side on both sides, with one end of each rest platform beam 15 fixed to an upper side stair column 5 via a TB node 9. The two rest platform beams 26 are arranged side by side in the middle, with one end of each rest platform beam 216 fixed to an upper middle stair column 6 via a TB node 9. A rest platform beam 37 is provided between the rest platform beams 15 and 216, with one end of each rest platform beam 37 fixed to an upper side stair column 5 via a TB node 9, and the other end of each rest platform beam 317 fixed to an upper middle stair column 6 via a TB node 9.

[0078] The main steel keel 14 is positioned between rest platform beam 15 and rest platform beam 2 16. The outer edge of the main steel keel 14 overlaps with rest platform beams 15, 2 16, and 3 17. Two adjusting bolts 18 are symmetrically screwed onto each side of the main steel keel 14. The outer ends of the adjusting bolts 18 mate with the inner end faces of either rest platform beam 15 or rest platform beam 2 16. A main rest platform plate 13 is fixed to the upper end face of the main steel keel 14. Intermediate angle steel keels 12 are arranged side-by-side between the two rest platform beams 2 16. A channel steel keel 36 is fixed to one side between the two intermediate angle steel keels 12. The outer edge of the intermediate angle steel keel 12 overlaps with rest platform beam 2 16. An intermediate rest platform plate 11 is fixed to the upper end face of the intermediate angle steel keel 12. The undisclosed technical features in this embodiment are the same as in specific embodiment two.

[0079] Specific implementation method four: Combination Figures 1 to 40This embodiment describes a TB node 9 comprising a beam sealing plate 9-1, an upper connecting plate 9-7, a lower connecting plate 9-8, an upper T-shaped connecting assembly, and a lower rectangular connecting assembly. The beam sealing plate 9-1 is vertically fixed to the connecting port of the connecting beam. The upper T-shaped connecting assembly is vertically fixed to the upper part of the outer end face of the beam sealing plate 9-1, and the lower rectangular connecting assembly is vertically fixed to the lower part of the outer end face of the beam sealing plate 9-1. The upper T-shaped connecting assembly and the lower rectangular connecting assembly are vertically fixed together. The connecting plate 9-7 is vertically fixed to the side wall of the connecting part of the connecting column, and the lower connecting plate 9-8 is horizontally fixed to the side wall of the connecting part of the ladder column assembly. The lower connecting plate 9-8 is located below the upper connecting plate 9-7. The upper connecting plate 9-7 is fixed to the upper T-shaped connecting assembly by the upper connecting bolt 9-9. The lower rectangular connecting assembly is located between the upper connecting plate 9-7 and the lower connecting plate 9-8, and the lower connecting plate 9-8 is fixed to the lower rectangular connecting assembly by the lower connecting bolt 9-10. The undisclosed technical features in this embodiment are the same as those in specific embodiment three.

[0080] The number of upper connecting bolts 9-9 and lower connecting bolts 9-10 is two each.

[0081] The upper T-shaped connecting assembly includes an upper web plate 9-2, which is vertically fixed to the middle of the upper side of the outer end face of the beam sealing plate 9-1, and an upper connecting plate 9-7 is disposed on one side of the upper web plate 9-2.

[0082] The lower rectangular connecting assembly includes a middle sealing plate 9-3, a lower flange 9-4, a front sealing plate 9-5, and two lower web plates 9-6. The middle sealing plate 9-3 is horizontally fixed to the middle of the outer end face of the beam sealing plate 9-1. The upper end face of the middle sealing plate 9-3 is perpendicularly fixed to the lower end of the upper web plate 9-2. A lower web plate 9-6 is vertically fixed to each side of the lower part of the outer end face of the beam sealing plate 9-1. The upper end of the lower web plate 9-6 is perpendicularly fixed to the side end of the middle sealing plate 9-3. The beam sealing plate 9-1... The bottom of the outer end face is horizontally fixed with a lower flange 9-4. The side end of the lower flange 9-4 is vertically fixed with the lower end of the lower web 9-6. The front sealing plate 9-5 is vertically set. The upper end of the front sealing plate 9-5 is vertically fixed with the outer end of the middle sealing plate 9-3. The two sides of the front sealing plate 9-5 are vertically fixed with the outer ends of the lower web 9-6 respectively. The lower end of the front sealing plate 9-5 is vertically fixed with the outer end of the lower flange 9-4. The lower end face of the lower flange 9-4 matches the upper end face of the lower connecting plate 9-8.

[0083] The upper T-shaped connecting assembly also includes an upper flange 9-12, which is horizontally fixed to the top of the outer end face of the beam sealing plate 9-1. The middle part of the lower end face of the upper flange 9-12 is vertically fixed to the upper end of the upper web plate 9-2. The upper connecting plate 9-7 is disposed between the upper flange 9-12 and the intermediate sealing plate 9-3.

[0084] A stiffening rib 9-11 is fixedly attached to each side of the lower end face of the lower connecting plate 9-8.

[0085] The lower flange bolt hole 9-4-1 has a threaded interior or a smooth hole.

[0086] When the lower flange bolt hole 9-4-1 has an internal thread, the end of the lower connecting bolt 9-10 is threaded to the lower flange bolt hole 9-4-1. A sealing plate stiffening rib 9-13 is vertically fixed between the middle of the lower end face of the intermediate sealing plate 9-3 and the middle of the upper end face of the lower flange 9-4. The inner end of the sealing plate stiffening rib 9-13 is perpendicularly fixed to the outer end face of the beam sealing plate 9-1, and the outer end of the sealing plate stiffening rib 9-13 is perpendicularly fixed to the inner end face of the front sealing plate 9-5.

[0087] When the interior of the lower flange bolt hole 9-4-1 is a smooth hole, two sleeves 9-14 are vertically fixed between the lower end face of the intermediate sealing plate 9-3 and the upper end face of the lower flange 9-4. Each sleeve 9-14 is coaxially set with one lower flange bolt hole 9-4-1. The sleeve 9-14 has an internal thread. The end of the lower connecting bolt 9-10 passes through the lower flange bolt hole 9-4-1 and is threaded to the inner wall of the sleeve 9-14.

[0088] Specific Implementation Method Five: Combining Figures 1 to 40This embodiment describes a lower and upper staircase assembly, each comprising two lower and two upper staircase assemblies. Both lower and upper staircase assemblies are inclined from bottom to top, and are arranged parallel to each other. Each lower staircase assembly includes a lower rectangular steel pipe staircase beam 19, a lower step overlap plate 20, a lower handrail 21, and a lower railing assembly 22. Each upper staircase assembly includes an upper rectangular steel pipe... The lower section of the lower stair beam 23, the upper section tread overlap plate 24, the upper section handrail 25, and the upper section railing assembly 26 are all part of the lower stair assembly. The lower end of the lower section rectangular steel pipe stair beam 19 in the lower stair assembly is fixed to the frame beam 2 via a TU snap-fit ​​joint 8. The upper end of the upper section rectangular steel pipe stair beam 23 in the lower stair assembly is fixed to the connecting beam via a UT joint 10. The lower end of the lower section rectangular steel pipe stair beam 19 in the upper stair assembly is fixed to the connecting beam via a UT joint 10. The upper section of the upper stair assembly... The upper end of the rectangular steel pipe stair beam 23 is fixedly connected to the frame beam 2 via a TU snap-fit ​​joint 8. The upper end of the lower rectangular steel pipe stair beam 19 is fixedly connected to the lower end of the upper rectangular steel pipe stair beam 23 via a UT joint 10. The lower step lap plate 20 is fixedly connected to the inner side of the lower rectangular steel pipe stair beam 19. The lower handrail 21 is parallel to the upper end of the lower rectangular steel pipe stair beam 19 and is fixed to the lower railing assembly 22. Next, the upper step overlap plate 24 is fixedly connected to the inner side of the upper rectangular steel pipe stair beam 23. The upper handrail 25 is arranged parallel to the upper end of the upper rectangular steel pipe stair beam 23. The upper handrail 25 and the upper rectangular steel pipe stair beam 23 are fixedly connected by the upper railing assembly 26. The upper end of the lower handrail 21 is fixedly connected to the lower end of the upper handrail 25 by the handrail connecting assembly 30. Step plates 29 are fixedly connected between the two lower step overlap plates 20 and the two upper step overlap plates 24. The undisclosed technical features in this embodiment are the same as those in specific embodiment three.

[0089] The lower end of the lower rectangular steel pipe ladder beam 19 of the lowest layer ladder assembly is directly fixed to the ladder foundation 31.

[0090] The stepped foundation 31 includes a concrete foundation, foundation embedded parts, and embedded part connecting steel plates. The foundation embedded parts are fixed to the upper surface of the concrete foundation. Multiple anchor bars are evenly distributed and fixed to the lower surface of the foundation embedded parts. The anchor bars are set inside the concrete foundation. Multiple anchor bolts are evenly distributed and fixed to the upper surface of the foundation embedded parts. The embedded part connecting steel plates are set on the foundation embedded parts and fixed to the foundation embedded parts through anchor bolts.

[0091] The step plate 29 is fixedly connected to the lower step overlap plate 20 and the upper step overlap plate 24 by step bolts 38.

[0092] Specific Implementation Method Six: Combination Figures 1 to 40This embodiment describes a TU-type snap-fit ​​node 8, which includes a U-shaped connecting plate 8-1, two T-shaped connecting plates 8-2, four sets of adjusting angle steels 8-3, four sets of connecting bolts 8-4, and four sets of fastening bolts 8-5. The vertical ends of the two T-shaped connecting plates 8-2 are vertically opposite each other on both sides of the web 2-1 in the middle of the frame beam 2. Each T-shaped connecting plate 8-2 has a set of adjusting angle steels 8-3 on its upper and lower sides, and each set of adjusting angle steels 8-3 includes two oppositely arranged adjusting angle steels 8-3. Two adjusting angle steels 8-3 are respectively set on the front and rear sides of the vertical end of the T-shaped connecting plate 8-2. Each set of adjusting angle steels 8-3 is fixedly connected by a set of connecting bolts 8-4. The open ends of the two U-shaped connecting plates 8-1 are arranged opposite each other and fitted onto the outer sides of the upper and lower end flanges 2-2 of the frame beam 2. The sidewall of the U-shaped connecting plate 8-1 is set on the outer side of the horizontal end of the T-shaped connecting plate 8-2, and the sidewall of the U-shaped connecting plate 8-1 is fixedly connected to the horizontal end of the T-shaped connecting plate 8-2 by a set of fastening bolts 8-5. The undisclosed technical features in this embodiment are the same as those in specific embodiment five.

[0093] The T-shaped connecting plate 8-2 includes a web 8-2-1 and a flange 8-2-2. The web 8-2-1 is a vertical end, and the flange 8-2-2 is a horizontal end. The web 8-2-1 is vertically positioned between the upper and lower beam flanges 2-2. The flange 8-2-2 is parallel to the web 2-1. The outer end of the web 8-2-1 is vertically fixed to the middle of the inner end face of the flange 8-2-2.

[0094] The T-shaped connecting plate flange 8-2-2 is located on the outer side between the upper and lower end beam flanges 2-2.

[0095] The adjusting angle steel 8-3 is set on the inner end of the web plate 8-2-1 of the T-shaped connecting plate.

[0096] The adjusting angle steel 8-3 includes an angle steel flange 8-3-1, an angle steel web 8-3-2, and an angle steel sealing plate 8-3-3. The angle steel flange 8-3-1, the angle steel web 8-3-2, and the angle steel sealing plate 8-3-3 are vertically fixed in pairs. The angle steel flange 8-3-1 mates with the side wall of the beam web 2-1, the angle steel web 8-3-2 mates with the side wall of the T-shaped connecting plate web 8-2-1, and the angle steel sealing plate 8-3-3 mates with the inner side wall of the beam flange 2-2.

[0097] The U-shaped connecting plate 8-1 includes a U-shaped connecting plate web 8-1-1 and two U-shaped connecting plate flanges 8-1-2. The U-shaped connecting plate web 8-1-1 is the middle horizontal end, and the U-shaped connecting plate flanges 8-1-2 are vertical sidewalls. The U-shaped connecting plate web 8-1-1 is located at the outer end of the beam flange 2-2, and the U-shaped connecting plate flanges 8-1-2 are located at the outer end of the T-shaped connecting plate flanges 8-2-2.

[0098] Specific implementation method seven: Combining Figures 1 to 40 This embodiment describes a UT node 10 comprising a rear end plate 10-1, a front end plate 10-2, a connecting end plate 10-6, a lower connecting plate 10-7, an upper connecting bolt 10-8, an upper connecting assembly, a lower connecting assembly, two side end plates 10-9, and a lower connecting bolt 10-10. The rear end plate 10-1 is vertically fixed to the connecting part of a connector. The front end plate 10-2 is arranged parallel to the outside of the rear end plate 10-1. The upper part of the front end plate 10-2 and the rear end plate 10-1 is fixedly connected by the upper connecting assembly. The lower part of the front end plate 10-2 is fixed to the rear end plate 10-1 via a lower connecting assembly. The connecting end plate 10-6 is vertically fixed to the connecting part of another connector. The lower connecting plate 10-7 is horizontally fixed to the outer side of the lower end of the connecting end plate 10-6. The upper part of the front end plate 10-2 is fixed to the outer end face of the connecting end plate 10-6 via an upper connecting bolt 10-8. The lower connecting assembly is fixed to the upper end face of the lower connecting plate 10-7 via a lower connecting bolt 10-10. The upper connecting assembly is shaped like a "U" and the lower connecting assembly is shaped like an inverted "T". The undisclosed technical features in this embodiment are the same as those in specific embodiment five.

[0099] The upper connecting assembly includes a middle connecting plate 10-3 and two side end plates 10-9. The middle connecting plate 10-3 is horizontally disposed in the middle between the front end plate 10-2 and the rear end plate 10-1. One end of the middle connecting plate 10-3 is fixedly connected to the outer end face of the rear end plate 10-1, and the other end of the middle connecting plate 10-3 is fixedly connected to the inner end face of the front end plate 10-2. The side end plates 10-9 are vertically disposed on both sides of the upper part between the front end plate 10-2 and the rear end plate 10-1. One end of the side end plate 10-9 is fixedly connected to the outer end face of the rear end plate 10-1, and the other end of the side end plate 10-9 is fixedly connected to the inner end face of the front end plate 10-2. The lower end of the side end plate 10-9 is fixedly connected to the upper end face of the middle connecting plate 10-3.

[0100] The lower connecting assembly includes a lower web plate 10-4 and a bottom end plate 10-5. The lower web plate 10-4 is vertically positioned in the middle of the lower part between the front end plate 10-2 and the rear end plate 10-1. One end of the lower web plate 10-4 is fixedly connected to the outer end face of the rear end plate 10-1, and the other end of the lower web plate 10-4 is fixedly connected to the inner end face of the front end plate 10-2. The bottom end plate 10-5 is horizontally positioned in the lower part between the front end plate 10-2 and the rear end plate 10-1. One end of the bottom end plate 10-5 is fixedly connected to the outer end face of the rear end plate 10-1, and the other end of the bottom end plate 10-5 is fixedly connected to the inner end face of the front end plate 10-2. The middle part of the upper end face of the bottom end plate 10-5 is fixedly connected to the lower end of the lower web plate 10-4.

[0101] A stiffening rib 10-11 is provided on each side of the lower end face of the lower connecting plate 10-7.

[0102] The bottom end plate 10-5 has a lower connecting bolt hole 10-5-1 on each side, and the lower connecting plate 10-7 has a lower bolt hole 10-7-1 on each side. Each lower bolt hole 10-7-1 is corresponding to a lower connecting bolt hole 10-5-1. The lower connecting bolt 10-10 is set in a lower connecting bolt hole 10-5-1 and the corresponding lower bolt hole 10-7-1.

[0103] The upper part of the front end plate 10-2 is provided with an upper connecting bolt hole 10-2-1, and the upper part of the connecting end plate 10-6 is provided with an upper bolt hole 10-6-1. The upper bolt hole 10-6-1 is provided in correspondence with the upper connecting bolt hole 10-2-1, and the upper connecting bolt 10-8 is provided in the upper connecting bolt hole 10-2-1 and the upper bolt hole 10-6-1.

[0104] When used for beam-to-beam connections or spatial structure connections, the upper bolt hole 10-6-1 has an internal thread. The end of the upper connecting bolt 10-8 is threaded into the upper threaded hole 10-6-1. A sealing plate stiffening rib 10-18 is horizontally fixed to the inner end face of the connecting end plate 10-6, and the sealing plate stiffening rib 10-18 is located below the upper bolt hole 10-6-1. The sealing plate stiffening rib 10-18 is horizontally fixed to the inner end face of the connecting end plate 10-6, and is located below the upper bolt hole 10-6-1. Both sides of the sealing plate stiffening rib 10-18 are fixed to the side wall of another beam.

[0105] When used for beam-to-beam connection or beam-to-column connection, the interior of the upper bolt hole 10-6-1 is a smooth hole, and a sleeve 10-12 is vertically fixed to the inner end face of the connecting end plate 10-6. The sleeve 10-12 is coaxially arranged with the upper bolt hole 10-6-1, and the sleeve 10-12 has an internal thread. The end of the upper connecting bolt 10-8 passes through the upper bolt hole 10-6-1 and is threaded to the inner wall of the sleeve 10-12.

[0106] A sleeve stiffening rib 10-13 is vertically fixed to the outer wall of the sleeve 10-12.

[0107] Specific implementation method eight: Combination Figures 1 to 40 This embodiment describes a handrail connecting assembly 30 comprising a first handrail connecting plate 30-1, a second handrail connecting plate 30-2, a first handrail sealing plate 30-5, a second handrail sealing plate 30-6, a U-shaped sealing plate 30-4, and a set of handrail connecting bolts 30-3. The first handrail sealing plate 30-5 is fixed to one end of a handrail connection, and the second handrail sealing plate 30-6 is fixed to the other end of a handrail connection. The first handrail connecting plate 30-1 and the second handrail connecting plate 30-2 are arranged parallel to each other on the first handrail sealing plate 30-5 and the second handrail sealing plate 30-6. Between -6, the inner end of the first handrail connecting plate 30-1 is perpendicularly fixed to the outer end face of the first handrail sealing plate 30-5, and the inner end of the second handrail connecting plate 30-2 is perpendicularly fixed to the outer end face of the second handrail sealing plate 30-6. The first handrail connecting plate 30-1 and the second handrail connecting plate 30-2 are fixed together by a set of handrail connecting bolts 30-3. The open end of the U-shaped sealing plate 30-4 is fixed downwards to the upper part between the first handrail sealing plate 30-5 and the second handrail sealing plate 30-6. The lower open end of the U-shaped sealing plate 30-4 is fixedly connected to a connecting sealing plate 30-7. The undisclosed technical features in this embodiment are the same as those in specific embodiment five.

[0108] Specific Implementation Method Nine: Combining Figures 1 to 40 In this embodiment, a platform handrail 27 is provided parallel to the upper end of the rest platform beam 15, and the platform handrail 27 is fixedly connected to the rest platform beam 15 by a platform railing assembly 28. The undisclosed technical features in this embodiment are the same as in specific embodiment eight.

[0109] The lower and upper staircase components also include a corner railing assembly. The corner railing assembly includes a square steel pipe 32, a corner handrail 33, a corner railing group 35, and two handrail connecting lugs 34. The square steel pipe 32 is fixed to a groove on the other side of the intermediate rest platform plate 11. The corner handrail 33 is arranged parallel to the upper end of the square steel pipe 32. The corner handrail 33 and the square steel pipe 32 are fixedly connected by the corner railing group 35. Each end of the corner handrail 33 is fixedly connected to a handrail connecting lug 34. One end of the handrail connecting lug 34 is fixedly connected to the upper end of the upper handrail 25, and the other end of the handrail connecting lug 34 is fixedly connected to the lower end of the lower handrail 21.

[0110] The square steel tube 32 of the corner railing assembly at the top floor is fixedly connected to the frame beam 2 via TU snap-fit ​​node 8.

[0111] The first handrail connecting plate 30-1 and the second handrail connecting plate 30-2 are arranged adjacent to each other.

[0112] The first handrail connecting plate 30-1 and the second handrail connecting plate 30-2 are respectively arranged in the vertical direction.

[0113] The connecting sealing plate 30-7 is located on the inner side of the lower opening end of the U-shaped sealing plate 30-4.

[0114] The lower part of the inner sidewalls on both sides of the U-shaped sealing plate 30-4 is fixed with two ear plates 30-8 along the length direction. The ear plates 30-8 are provided with threaded through holes 30-8-1 along the vertical direction. Two connecting through holes 30-7-1 are provided on both sides of the connecting sealing plate 30-7. Each connecting through hole 30-7-1 is corresponding to a threaded through hole 30-8-1. A sealing plate connecting bolt 30-12 is provided in the connecting through hole 30-7-1. The end of the sealing plate connecting bolt 30-12 is threadedly connected to the corresponding threaded through hole 30-8-1.

[0115] Two positioning rods 30-9 are vertically fixed to both sides of the inner sidewall of the upper arc end of the U-shaped sealing plate 30-4 along the length direction. A stop block 30-10 is fixed to both sides of the outer end of the first handrail sealing plate 30-5 and the second handrail sealing plate 30-6. A positioning hole 30-10-1 is provided on the stop block 30-10 along the vertical direction. The lower end of each positioning rod 30-9 is inserted into a positioning hole 30-10-1.

[0116] A limiting ring 30-11 is fitted and fixed on the positioning rod 30-9, and the limiting ring 30-11 is set on the upper end face of the stop block 30-10.

[0117] The positioning rod 30-9 and the positioning hole 30-10-1 are fitted with a clearance.

[0118] Specific Implementation Method Ten: Combining Figures 1 to 40 This embodiment describes a method for assembling a prefabricated steel structure staircase, which includes the following steps:

[0119] Step 1: Install the lower section of the lower stair section assembly, the upper section of the upper stair section assembly, and the stair column assembly: First, fix the lower section of the lowest lower stair section assembly to the stair foundation 31. Then, use the TU snap-fit ​​node 8 to fix the lower section of the lower stair section assembly and the upper section of the upper stair section assembly to the frame beam 2. Next, fix the lower end of the bottom side stair column 3 to the stair column foundation 7. Finally, use the TU snap-fit ​​node 8 to fix the upper side stair column 5 and the upper middle stair column 6 to the frame beam 2.

[0120] Step 2: Install the upper stair section component in the lower stair section assembly and the lower stair section component in the upper stair section assembly: First, fix the upper stair section component in the lower stair section assembly to the lower stair section component in the lower stair section assembly through UT node 10. Then, fix the lower stair section component in the upper stair section assembly to the upper stair section component in the upper stair section assembly through UT node 10. Finally, fix the lower handrail 21 and the upper handrail 25 together through handrail connecting component 30.

[0121] Step 3: Install connecting beams: First, fix one end of rest platform beam 15 and rest platform beam 2 16 to the stair column assembly through TB ​​node 9. Then, fix the other end of rest platform beam 15 and rest platform beam 2 16 to the upper stair section assembly and the lower stair section assembly in the lower stair section assembly respectively through UT node 10. Finally, fix rest platform beam 3 17 to the stair column assembly through TB ​​node 9.

[0122] Step 4: Install the step treads 29, rest platform treads, corner railing components, and top-level corner railing components: First, fix the step treads 29 to the two lower step overlap plates 20 and the two upper step overlap plates 24 using step bolts 38. Then, overlap the prefabricated intermediate rest platform treads 11 and intermediate angle steel keel 12 onto the connecting beam. Overlap the prefabricated main rest platform treads 13 and main steel keel 14 onto the connecting beam and fix them to the connecting beam using tightening adjusting bolts 18. Next, fix the corner railing components to the channel steel keel 36. Fix the handrail connecting ear plates 34 in the corner railing components to the upper handrail 25 and the lower handrail 21 respectively using bolts. Finally, fix the top-level corner railing components to the frame beam 2 using TU snap-fit ​​nodes 8.

[0123] When connecting TB node 9, place the lower flange 9-4 on the upper end face of the lower connecting plate 9-8, and install the upper connecting plate 9-7 between the upper flange 9-12 and the intermediate sealing plate 9-3 and close to the side wall of the upper web plate 9-2. First, install two lower connecting bolts 9-10 in the lower flange bolt hole 9-4-1 and the corresponding lower connecting bolt hole 9-8-1, and then install the upper connecting bolt 9-9 in the upper bolt hole 9-2-1 and the corresponding upper connecting bolt hole 9-7-1.

[0124] When connecting the TU snap-fit ​​node 8, first, the web plates 8-2-1 of the two T-shaped connecting plates 8-2 are vertically positioned opposite each other on both sides of the web plate 2-1 in the middle of the frame beam 2. Then, adjusting angle steels 8-3 are installed on the front and rear sides of the web plates 8-2-1. The flanges 8-3-1 of the angle steels mate with the side walls of the web plate 2-1, the web plates 8-3-2 mate with the side walls of the web plates 8-2-1, and the end plates 8-3-3 mate with the inner side walls of the flanges 2-2. The threaded sections of the connecting bolts 8-4 pass through the bolt holes 8-3-4 on one side, the bolt holes 8-2-3 on the other side, and the bolts 8-3-4 on the other side in sequence. Screw on the connecting nut 8-4-1 at the end of the threaded section of the connecting bolt 8-4 to fix the web plate 8-2-1 of the T-shaped connecting plate. Then, set the open ends of the two U-shaped connecting plates 8-1 opposite each other and fit them on the outer side of the upper and lower end flanges 2-2 of the frame beam 2. The web plate 8-1-1 of the U-shaped connecting plate mates with the outer end of the flange 2-2, and the flange 8-1-2 of the U-shaped connecting plate mates with the outer end of the flange 8-2-2 of the T-shaped connecting plate. The threaded section of the fastening bolt 8-5 passes through the flange bolt hole 8-1-3 and the fastening bolt hole 8-2-4 in sequence from first to last. Screw on the fastening nut 8-5-1 at the end of the threaded section of the fastening bolt 8-5 to fix the U-shaped connecting plate 8-1.

[0125] When connecting UT node 10, place the bottom end plate 10-5 on the upper end face of the lower connecting plate 10-7, and press the outer end face of the front end plate 10-2 against the outer end face of the connecting end plate 10-6. First, install two lower connecting bolts 10-10 in the lower connecting bolt hole 10-5-1 and the corresponding lower bolt hole 10-7-1. Then, install the upper connecting bolt 10-8 in the upper connecting bolt hole 10-2-1 and the corresponding upper bolt hole 10-6-1.

[0126] When connecting the handrail connecting assembly 30, firstly, the side walls of the first handrail connecting plate 30-1 and the second handrail connecting plate 30-2 are tightly fitted together. Then, a set of handrail connecting bolts 30-3 are used to fix the first handrail connecting plate 30-1 and the second handrail connecting plate 30-2 together. Next, the open end of the U-shaped sealing plate 30-4 is flipped downwards and pressed against the outside of the first handrail connecting plate 30-1 and the second handrail connecting plate 30-2, and the positioning rod 30-9 is then lowered downwards. Insert it into the positioning hole 30-10-1 of the stop block 30-10 until the lower end face of the limiting ring 30-11 falls on the upper end face of the stop block 30-10. This completes the limiting and fixing of the U-shaped sealing plate 30-4. Then, place the connecting sealing plate 30-7 under the inner ear plate 30-8 at the open end of the U-shaped sealing plate 30-4. Fix the connecting sealing plate 30-7 and the ear plate 30-8 together by the sealing plate connecting bolts 30-12 installed from bottom to top.

[0127] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A prefabricated steel structure staircase, characterized in that: It includes a multi-layer stair column assembly and a multi-layer stair assembly. The multi-layer stair column assembly is arranged sequentially from bottom to top along the outer end of the frame assembly. The stair column assembly is fixed to the outer end of the frame assembly through TU snap-fit ​​nodes (8). Each stair column assembly is fixed with a layer of stair assembly. Each staircase assembly includes a landing assembly, a lower staircase assembly, and an upper staircase assembly. The landing assembly is connected to the stair column assembly via a TB node (9) or a UT node (10). The lower end of the lower staircase assembly is fixed to the inner end of the frame assembly via a TU snap-fit ​​node (8). The upper end of the lower staircase assembly is fixed to one side of the landing assembly via a UT node (10). The lower end of the upper staircase assembly is fixed to the other side of the landing assembly via a UT node (10). The upper end of the upper staircase assembly is fixed to the inner end of the frame assembly via a TU snap-fit ​​node (8). Each floor's stair column assembly includes two upper-level side stair columns (5) and two upper-level middle stair columns (6); the rest platform assembly includes a middle rest platform slab (11), a middle angle steel keel (12), a connecting beam, two main rest platform slabs (13), and two main steel keels (14); the TB node (9) includes a beam end plate (9-1), an upper connecting plate (9-7), a lower connecting plate (9-8), an upper T-shaped connecting assembly, and a lower rectangular connecting assembly; both the lower-level stair section assembly and the upper-level stair section assembly include two lower stair section assemblies and two upper stair section assemblies. The ladder segment assembly; the TU snap-fit ​​node (8) includes a U-shaped connecting plate (8-1), two T-shaped connecting plates (8-2), four sets of adjusting angle steel (8-3), four sets of connecting bolts (8-4) and four sets of fastening bolts (8-5); the UT node (10) includes a rear end plate (10-1), a front end plate (10-2), a connecting end plate (10-6), a lower connecting plate (10-7), an upper connecting bolt (10-8), an upper connecting component, a lower connecting component, two side end plates (10-9) and a lower connecting bolt (10-10).

2. The prefabricated steel structure staircase according to claim 1, characterized in that: Two upper side stair columns (5) are vertically set on both sides of the corresponding rest platform component, and the middle part of the upper side stair column (5) is fixed to both sides of the rest platform component. Two upper middle stair columns (6) are vertically set in the middle of the corresponding rest platform component, and the top of the upper middle stair column (6) is fixed to the middle of the rest platform component. The lower end of the upper side stair column (5), the lower end of the upper middle stair column (6), and the upper end of the lower side stair column (5) are fixed to the same frame beam (2) on the outer end of the frame component.

3. The prefabricated steel structure staircase according to claim 2, characterized in that: The connecting beam includes two rest platform beams (15), two rest platform beams (16), and two rest platform beams (17). The two rest platform beams (15) are arranged side by side on both sides. One end of each rest platform beam (15) is fixed to an upper side stair column (5) through a TB node (9). The two rest platform beams (16) are arranged side by side in the middle. One end of each rest platform beam (16) is fixed to an upper middle stair column (6) through a TB node (9). The rest platform beams (17) are arranged between the rest platform beams (15) and the rest platform beams (16). One end of each rest platform beam (17) is fixed to an upper side stair column (5) through a TB node (9), and the other end of each rest platform beam (17) is fixed to an upper middle stair column (6) through a TB node (9). The main steel keel (14) is set between the first rest platform beam (15) and the second rest platform beam (16). The outer edge of the main steel keel (14) overlaps the first rest platform beam (15), the second rest platform beam (16) and the third rest platform beam (17). Two adjusting bolts (18) are symmetrically screwed on each side of the main steel keel (14). The outer end of the adjusting bolt (18) matches the inner end face of the first rest platform beam (15) or the second rest platform beam (16). The main rest platform plate (13) is fixed on the upper end face of the main steel keel (14). The intermediate angle steel keel (12) is set in parallel between the two second rest platform beams (16). The channel steel keel (36) is fixed on one side between the two intermediate angle steel keels (12). The outer edge of the intermediate angle steel keel (12) overlaps the second rest platform beam (16). The intermediate rest platform plate (11) is fixed on the upper end face of the intermediate angle steel keel (12).

4. The prefabricated steel structure staircase according to claim 3, characterized in that: The beam end plate (9-1) is vertically fixed to the connection port of the connecting beam. The upper part of the outer end face of the beam end plate (9-1) is vertically fixed to the upper T-shaped connecting component, and the lower part of the outer end face of the beam end plate (9-1) is vertically fixed to the lower rectangular connecting component. The upper T-shaped connecting component and the lower rectangular connecting component are vertically fixed together. The upper connecting plate (9-7) is vertically fixed to the side wall of the connection of the connecting column. The lower connecting plate (9-8) is horizontally fixed to the side wall of the connection of the ladder column component. The lower connecting plate (9-8) is set below the upper connecting plate (9-7). The upper connecting plate (9-7) and the upper T-shaped connecting component are fixed together by the upper connecting bolt (9-9). The lower rectangular connecting component is set between the upper connecting plate (9-7) and the lower connecting plate (9-8), and the lower connecting plate (9-8) and the lower rectangular connecting component are fixed together by the lower connecting bolt (9-10).

5. The prefabricated steel structure staircase according to claim 3, characterized in that: Both the lower and upper stair section components are inclined from bottom to top. The two lower stair section components and the two upper stair section components are arranged in parallel and opposite directions. The lower stair section component includes a lower rectangular steel pipe stair section beam (19), a lower step lap plate (20), a lower handrail (21), and a lower railing assembly (22). The upper stair section component includes an upper rectangular steel pipe stair section beam (23), an upper step lap plate (24), an upper handrail (25), and an upper railing assembly (26). The lower section of the lower stair section component is rectangular steel pipe beam (23), an upper step lap plate (24), an upper handrail (25), and an upper railing assembly (26). The lower end of the rectangular steel pipe stair beam (19) is fixed to the frame beam (2) via a TU snap-fit ​​joint (8). The upper end of the upper section of the rectangular steel pipe stair beam (23) in the lower stair assembly is fixed to the connecting beam via a UT joint (10). The lower end of the lower section of the rectangular steel pipe stair beam (19) in the upper stair assembly is fixed to the connecting beam via a UT joint (10). The upper end of the upper section of the rectangular steel pipe stair beam (23) in the upper stair assembly is fixed to the frame beam (2) via a TU snap-fit ​​joint (8). The upper end of the lower rectangular steel pipe stair beam (19) is fixedly connected to the lower end of the upper rectangular steel pipe stair beam (23) via a UT node (10). The lower step lap plate (20) is fixedly connected to the inner side of the lower rectangular steel pipe stair beam (19). The lower handrail (21) is parallel to the upper end of the lower rectangular steel pipe stair beam (19). The lower handrail (21) is fixedly connected to the lower rectangular steel pipe stair beam (19) via a lower railing assembly (22). The upper step lap plate (24) is fixedly connected to the upper... On the inner side of the rectangular steel pipe stair beam (23), the upper handrail (25) is set parallel to the upper end of the upper rectangular steel pipe stair beam (23). The upper handrail (25) and the upper rectangular steel pipe stair beam (23) are fixedly connected by the upper railing assembly (26). The upper end of the lower handrail (21) and the lower end of the upper handrail (25) are fixedly connected by the handrail connecting assembly (30). The two lower step overlap plates (20) and the two upper step overlap plates (24) are all fixedly connected with step plates (29).

6. The prefabricated steel structure staircase according to claim 5, characterized in that: The vertical ends of the two T-shaped connecting plates (8-2) are vertically opposite each other on both sides of the web plate (2-1) in the middle of the frame beam (2). Each T-shaped connecting plate (8-2) has a set of adjusting angle steel (8-3) on the upper and lower sides of the vertical end. Each set of adjusting angle steel (8-3) includes two adjusting angle steels (8-3) arranged opposite each other. The two adjusting angle steels (8-3) are respectively arranged on the front and rear sides of the vertical end of the T-shaped connecting plate (8-2). Each set of adjusting angle steels (8-3) is fixedly connected by a set of connecting bolts (8-4). The open ends of the two U-shaped connecting plates (8-1) are arranged opposite each other and fitted on the outer side of the upper and lower end flanges (2-2) of the frame beam (2). The side wall of the U-shaped connecting plate (8-1) is arranged on the outer side of the horizontal end of the T-shaped connecting plate (8-2). The side wall of the U-shaped connecting plate (8-1) is fixedly connected to the horizontal end of the T-shaped connecting plate (8-2) by a set of fastening bolts (8-5).

7. The prefabricated steel structure staircase according to claim 5, characterized in that: The rear end plate (10-1) is vertically and fixedly connected to the connecting part of a connecting member. The front end plate (10-2) is arranged in parallel on the outside of the rear end plate (10-1). The upper part between the front end plate (10-2) and the rear end plate (10-1) is fixedly connected by an upper connecting component, and the lower part between the front end plate (10-2) and the rear end plate (10-1) is fixedly connected by a lower connecting component. The connecting end plate (10-6) is vertically and fixedly connected to the connecting part of another connecting member. The lower connecting plate (10-7) is horizontally and fixedly connected to the outside of the lower end of the connecting end plate (10-6). The upper part of the front end plate (10-2) is fixedly connected to the outer end face of the connecting end plate (10-6) by an upper connecting bolt (10-8), and the lower connecting component is fixedly connected to the upper end face of the lower connecting plate (10-7) by a lower connecting bolt (10-10). The upper connecting component is in the shape of a "U", and the lower connecting component is in the shape of an inverted "T".

8. The prefabricated steel structure staircase according to claim 5, characterized in that: The handrail connecting component (30) includes a first handrail connecting plate (30-1), a second handrail connecting plate (30-2), a first handrail sealing plate (30-5), a second handrail sealing plate (30-6), a U-shaped sealing plate (30-4) and a set of handrail connecting bolts (30-3). The first handrail sealing plate (30-5) is fixedly connected to the port of one handrail connecting end, and the second handrail sealing plate (30-6) is fixedly connected to the port of the other handrail connecting end. The first handrail connecting plate (30-1) and the second handrail connecting plate (30-2) are arranged in parallel between the first handrail sealing plate (30-5) and the second handrail sealing plate (30-6). The inner end of the first handrail connecting plate (30-1) is perpendicularly and fixedly connected to the outer end face of the first handrail sealing plate (30-5), and the inner end of the second handrail connecting plate (30-2) is perpendicularly and fixedly connected to the outer end face of the second handrail sealing plate (30-6). The first handrail connecting plate (30-1) and the second handrail connecting plate (30-2) are fixedly connected by a set of handrail connecting bolts (30-3). The opening end of the U-shaped sealing plate (30-4) faces downward and is fixedly connected between the upper parts of the first handrail sealing plate (30-5) and the second handrail sealing plate (30-6). A connecting sealing plate (30-7) is fixedly connected to the lower opening end of the U-shaped sealing plate (30-4).

9. A prefabricated steel structure staircase according to claim 8, characterized in that: A platform handrail (27) is arranged in parallel at the upper end of the first rest platform beam (15). The platform handrail (27) and the first rest platform beam (15) are fixedly connected by a platform railing group (28).

10. A method for assembling a prefabricated steel structure staircase, characterized in that: The method includes the following steps: Step 1, install the lower stair segment component in the lower floor stair segment assembly, the upper stair segment component in the upper floor stair segment assembly and the stair post component: First, fixedly connect the lower stair segment component of the lowest lower floor stair segment assembly to the stair segment foundation (31), then use the TU buckle joint (8) to fixedly connect the lower stair segment component in the lower floor stair segment assembly and the upper stair segment component in the upper floor stair segment assembly to the frame beam (2), then fixedly connect the lower end of the bottom side stair post (3) to the stair post foundation (7), and finally use the TU buckle joint (8) to fix the upper side stair post (5) and the upper middle stair post (6) on the frame beam (2); Step 2: Install the upper stair section component in the lower stair section assembly and the lower stair section component in the upper stair section assembly: First, fix the upper stair section component in the lower stair section assembly to the lower stair section component in the lower stair section assembly through UT node (10), then fix the lower stair section component in the upper stair section assembly to the upper stair section component in the upper stair section assembly through UT node (10), and then fix the lower handrail (21) and the upper handrail (25) together through handrail connecting component (30); Step 3, Install connecting beams: First, fix one end of rest platform beam 1 (15) and rest platform beam 2 (16) to the stair column assembly through TB ​​node (9), and fix the other end of rest platform beam 1 (15) and rest platform beam 2 (16) to the upper stair column assembly and the lower stair column assembly in the lower stair column assembly respectively through UT node (10). Then fix rest platform beam 3 (17) to the stair column assembly through TB ​​node (9). Step 4: Install the step plate (29), rest platform plate, corner railing assembly and top corner railing assembly: First, fix the step plate (29) to the two lower step overlap plates (20) and the two upper step overlap plates (24) with step bolts (38). Then, overlap the prefabricated intermediate rest platform plate (11) and intermediate angle steel keel (12) on the connecting beam. Overlap the prefabricated main rest platform plate (13) and main steel keel (14) on the connecting beam and fix them to the connecting beam by tightening the adjusting bolts (18). Then, fix the corner railing assembly to the channel steel keel (36). Fix the handrail connecting ear plate (34) in the corner railing assembly to the upper handrail (25) and lower handrail (21) respectively with bolts. Finally, fix the top corner railing assembly to the frame beam (2) by TU buckle nodes (8).

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