A segmented steel staircase structure

Abstract

The present invention relates to the technical field of building stairs, and in particular to a segmented steel staircase structure. The segmented steel staircase structure includes multiple sections of steel staircase units, horizontal units, first embedded parts, second embedded parts, third embedded parts, steel staircase columns and steel hangers. Each section of the steel staircase unit includes two steel ladder beams spaced side by side, a bottom steel cover plate and multiple steps connected to the tops of the two steel ladder beams. Each step includes a horizontal steel plate, a vertical steel plate and side cover steel plates located at both ends of the horizontal steel plate that are welded to each other. The two side cover steel plates are respectively welded to the opposite ends of the two steel ladder beams. The top heights of the vertical steel plate and the side cover steel plates are both higher than the top height of the horizontal steel plate. A casting trough is formed between the vertical steel plate, the horizontal steel plate and the two side cover steel plates. Concrete is poured in the casting trough and the concrete surface is flush with the tops of the vertical steel plate and the side cover steel plates. The present invention has simple construction procedures, short construction period and high quality controllability.

Description

Technical Field

[0001] The present invention relates to the technical field of building stairs, in particular to a sectional steel staircase structure. Background Art

[0002] As the primary vertical transportation system and primary route for emergency evacuations, stairways significantly impact the normal operation and emergency evacuation of the entire building. Most existing buildings utilize traditional cast-in-place reinforced concrete stairways. While these offer significant advantages in durability, sound insulation, and maintenance-free design, they are also heavy and require complex processes such as formwork support, rebar tying, on-site pouring, and curing. These factors can lead to long construction periods, numerous hidden engineering steps, and poor quality control. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a segmented steel staircase structure to solve the technical problems of the existing technology of complex construction, long construction period and poor quality controllability of cast-in-place reinforced concrete stairs.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A segmented steel staircase structure, comprising:

[0006] A steel staircase unit, installed between two upper and lower adjacent floors, is provided with multiple sections, each section of the steel staircase unit comprising two steel ladder beams spaced side by side, a bottom steel cover plate connected to the bottom of the two steel ladder beams, and a plurality of steps connected to the top of the two steel ladder beams, each step comprising a horizontal steel plate and a vertical steel plate welded to each other, and side cover steel plates located at both ends of the horizontal steel plate, the two side cover steel plates being welded to opposite ends of the two steel ladder beams, the top heights of the vertical steel plate and the side cover steel plates being higher than the top height of the horizontal steel plate, a casting trough being formed between the vertical steel plate, the horizontal steel plate, and the two side cover steel plates, the casting trough being poured with concrete, and the concrete surface being flush with the tops of the vertical steel plate and the side cover steel plates;

[0007] The horizontal unit includes a suspended horizontal unit and a fixed horizontal unit. The suspended horizontal unit is connected between two adjacent steel staircase units, and the fixed horizontal unit is connected between the top steel staircase unit and the floor beam of the upper layer.

[0008] The first embedded part is used to be embedded in the floor beam or concrete floor of the lower layer;

[0009] The second embedded part is used to be embedded in the floor beam of the upper layer;

[0010] The third embedded part is used to be embedded in the floor beam at the bottom of the corresponding floor in the building, and the installation height of the third embedded part is higher than the installation height of the second embedded part;

[0011] Steel ladder columns, the bottom ends of which are welded to the first embedded parts in the concrete floor, and the top ends of which are welded to the corresponding suspended horizontal units;

[0012] The top end of the steel hanger is welded to the corresponding third embedded part, and the bottom end of the steel hanger is welded to the corresponding suspended horizontal unit.

[0013] Furthermore, the first embedded part includes a first embedded steel plate and a plurality of first embedded steel bars welded to the first embedded steel plate by plug welding; the second embedded part includes two second embedded steel plates and a plurality of second embedded steel bars arranged between the two second embedded steel plates, both ends of the second embedded steel bars are connected to the second embedded steel plates by plug welding, and the two second embedded steel plates are embedded on both sides of the beam of the same floor; the third embedded part includes a third embedded steel plate and a plurality of third embedded steel bars welded to the third embedded steel plate by plug welding, and the third embedded steel bar is L-shaped.

[0014] Furthermore, the suspended horizontal unit has the same structure as the fixed horizontal unit, both of which include two horizontal steel beams, two horizontal steel longitudinal beams, a bottom steel plate and a top steel pedal that are welded to each other; the two ends of the horizontal steel beam in the suspended horizontal unit are respectively welded to the steel ladder beams on the same side of the two adjacent steel stair units, the two ends of the horizontal steel longitudinal beam are respectively welded to the two steel ladder beams of the same steel stair unit, and the bottom steel plate and the top steel pedal are respectively welded between the two horizontal steel beams and the bottom and top of the two horizontal steel beams and the two horizontal steel longitudinal beams; the two ends of the horizontal steel beam in the fixed horizontal unit are respectively welded to the second embedded parts in the corresponding floor beam and the steel ladder beam on one side of the corresponding steel stair unit, the top steel pedal in the fixed horizontal unit is welded to the second embedded steel plate in the corresponding floor beam, and concrete is poured in the height space between the top steel pedal and the surface of the corresponding floor beam.

[0015] Furthermore, the horizontal steel cross beam and the horizontal steel longitudinal beam are both H-shaped steels, and multiple reinforcing plates are welded between the two flanges and the web of the horizontal steel cross beam. The horizontal steel cross beam and the horizontal steel longitudinal beam are welded vertically, and a unit connecting plate is fastened between the web of the horizontal steel longitudinal beam and the corresponding reinforcing plate on the horizontal steel cross beam by high-strength bolts.

[0016] Furthermore, the steel ladder column is a box-type structure, including a box-type column body and a plurality of reinforcing ribs welded in the box-type column body and arranged at intervals along the up-down direction. The box-type column body is welded to the horizontal steel beam of the suspended horizontal unit. The box-type column body includes four steel side plates extending along the up-down direction and welded end to end in the circumferential direction. The bottoms of the four steel side plates are welded to the first embedded steel plate in the concrete floor.

[0017] Furthermore, the steel hanger includes a rod body, end plates connected to both ends of the rod body, and lifting ear plates connected to the opposite sides of the two end plates. The lifting ear plate located at the upper end of the rod body is welded to the corresponding third embedded steel plate. Two spaced support hangers are welded to the position of the steel hanger on the side of the horizontal steel beam facing away from the horizontal steel longitudinal beam. The support hangers extend out of the horizontal steel beam. The lifting ear plate located at the lower end of the rod body is used to be passed between the two support hangers. A pin is vertically passed between the two support hangers and the lifting ear plate.

[0018] Furthermore, the steel ladder beam includes a plurality of spliced ​​beam units, each beam unit includes a steel beam with an H-shaped cross-section, a plurality of stiffening plates welded between the two flanges of the steel beam, and end side plates welded to the side ends of the two flanges of the steel beam. The corresponding ends of the steel beams of two adjacent beam units are welded together, the end side plates are correspondingly welded, and the two stiffening plates at the corresponding ends of the steel beams are adhered and connected by high-strength bolts.

[0019] Furthermore, a brick step is provided between the steel staircase unit at the bottom and the concrete floor, and the vertical steel plate at the bottom of the steel staircase unit at the bottom abuts against the brick step.

[0020] The beneficial effects of the sectional steel staircase structure of the present invention are:

[0021] 1. The present invention effectively combines steel structure with concrete pouring, which not only ensures the strength of the entire segmented steel staircase structure itself, but also ensures a firm connection with the floor beams and concrete floor.

[0022] 2. During construction, the steel structure of the steel staircase can be welded and assembled on the ground, and the concrete structure on the steel staircase can be installed after the steel staircase is positioned and fixed. Compared with cast-in-place reinforced concrete stairs, the entire steel staircase structure has a small weight and uses a small amount of concrete. The horizontal steel plates, vertical steel plates and side sealing steel plates of each step can serve as formwork themselves, without the need for additional formwork or steel bar binding. The construction is simple and the construction period is short.

[0023] 3. The processing accuracy of each steel component of the steel staircase is easy to ensure, and when the error is large, it can be corrected on the ground, reducing rework time and ensuring high quality controllability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the segmented steel staircase structure of the present invention;

[0025] Figure 2 Schematic diagram of the connection node between the bottom steel staircase unit and the concrete floor in the segmented steel staircase structure of the present invention;

[0026] Figure 3is a detailed schematic diagram of a steel staircase unit in the segmented steel staircase structure of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the first embedded part in the segmented steel staircase structure of the present invention;

[0028] Figure 5 yes Figure 4 Cross-sectional view

[0029] Figure 6 It is a structural schematic diagram of the second embedded part in the segmented steel staircase structure of the present invention;

[0030] Figure 7 yes Figure 6 sectional view of

[0031] Figure 8 It is a schematic diagram of the bottom connection node at the steel hanger in the segmented steel staircase structure of the present invention;

[0032] Figure 9 yes Figure 8 Cross-sectional view at AA;

[0033] Figure 10 It is a schematic diagram of the top connection node at the steel hanger in the segmented steel staircase structure of the present invention;

[0034] Figure 11 It is a schematic diagram of the connection nodes between the steel stair columns and the suspended horizontal units in the segmented steel staircase structure of the present invention;

[0035] Figure 12 It is a schematic diagram of the connection nodes between the horizontal steel cross beams and the horizontal steel longitudinal beams in the segmented steel staircase structure of the present invention;

[0036] Figure 13 It is a schematic diagram of the connection node between the fixed horizontal unit and the floor beam in the segmented steel staircase structure of the present invention.

[0037] Explanation of the accompanying symbols: 1-steel ladder beam, 2-steel hanger, 3-steel ladder column, 4-first embedded part, 5-second embedded part, 6-third embedded part, 7-first embedded steel plate, 8-first embedded steel bar, 9-second embedded steel plate, 10-second embedded steel bar, 11-third embedded steel plate, 12-third embedded steel bar, 13-horizontal steel plate, 14-vertical steel plate, 15-side sealing steel plate, 16-casting trough, 17-first concrete tread, 18- Suspended horizontal unit, 19-fixed horizontal unit, 20-horizontal steel beam, 21-horizontal steel longitudinal beam, 22-concrete floor, 23-reinforcement plate, 24-high-strength bolts, 25-unit connecting plate, 26-box column, 27-reinforcement rib plate, 28-steel side plate, 29-rod body, 30-end plate, 31-lifting ear plate, 32-pin shaft, 33-support hanging plate, 34-top steel pedal, 35-second concrete tread, 36-stiffening plate. DETAILED DESCRIPTION

[0038] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0039] Specific embodiment of the segmented steel staircase structure of the present invention:

[0040] like Figure 1 As shown, the sectional steel staircase structure includes multiple sections of steel staircase units, a horizontal unit, a first embedded part 4 , a second embedded part 5 , a third embedded part 6 , a steel stair column 3 and a steel hanger 2 .

[0041] Specifically, such as Figure 2 and Figure 3 As shown, a steel staircase unit is installed between two adjacent floors. Each section of the steel staircase unit consists of two spaced-apart steel ladder beams 1, a bottom steel cover plate connected to the bottom of the two steel ladder beams 1, and multiple steps connected to the top of the two steel ladder beams 1. Each step consists of a horizontal steel plate 13 and a vertical steel plate 14 welded together, and side cover plates 15 located at both ends of the horizontal steel plate 13. The two side cover plates 15 are respectively installed at opposite ends of the two steel ladder beams 1 and are bonded and welded to the surface of the steel ladder beams 1. The surfaces of all three steel plates are patterned. The tops of the vertical and side cover plates 14, 15 are higher than the top of the horizontal steel plate 13, forming a casting trough 16 between the vertical and horizontal steel plates 14, 13, and the two side cover plates 15. Concrete is poured into the casting trough 16 to form a first concrete tread 17, which is flush with the tops of the vertical and side cover plates 14, 15.

[0042] The steel ladder beam 1 comprises a plurality of spliced ​​beam units. Each beam unit comprises an H-shaped steel beam, a plurality of stiffening plates 36 welded between the two flanges of the steel beam, and end plates welded to the side ends of the two flanges of the steel beam. The corresponding ends of the steel beams of two adjacent beam units are welded together, the end plates are welded together, and the two stiffening plates at the corresponding ends of the steel beams are attached and connected by high-strength bolts. A plurality of connecting steel beams are also provided between the two steel ladder beams of the same steel stair unit. The connecting steel beams are H-shaped steel beams. The assembly process of the H-shaped steel beam is as follows: (1) pre-treatment, leveling, and cutting of the steel plates; (2) butt-jointing of the steel plates; (3) drilling and end-face processing of the H-shaped steel; (4) shot blasting and rust removal of the components; and (5) component identification and storage. Among them, steel plates need to be pretreated before cutting to remove the oxide layer on the surface of the steel plates, improve the density of the steel plate surface, and ensure the welding quality; steel plates are cut and cut using precision CNC flame steel plate cutting machines; steel plate butt grooves are semi-automatically cut with precision, and steel plate butt welding is semi-automatically welded with submerged arc welding; H-shaped steel is drilled after forming, and the holes are processed on imported fully automatic three-dimensional CNC drilling machines to ensure that the hole spacing meets the design requirements; end face processing is an important quality factor to ensure the connection of steel components. End face processing mainly involves milling the grooves on an end face milling machine to ensure the parallelism of the two end faces; after the components are completed and qualified, they enter the shot blasting and rust removal processing, and shot blasting and rust removal mainly adopt imported automatic shot blasting and rust removal machines.

[0043] like Figure 4 and Figure 5 As shown, the first embedded part 4 is used to be embedded in the floor beam or concrete floor 22 of the lower layer, including a first embedded steel plate 7 and a plurality of first embedded steel bars 8 that are plug-welded to the first embedded steel plate 7. Figure 6 and Figure 7 As shown, the second embedded part 5 is used to be embedded in the floor beam of the upper layer, including two second embedded steel plates 9 and a plurality of second embedded steel bars 10 arranged between the two second embedded steel plates 9. Both ends of the second embedded steel bars 10 are connected to the second embedded steel plates 9 by perforation plug welding to form a tension, as shown in FIG. Figure 13 As shown, two second embedded steel plates 9 are embedded on both sides of the same floor beam. Figure 10 As shown, the third embedded part 6 is used to be embedded in the second floor beam. The installation height of the third embedded part 6 is higher than the installation height of the second embedded part 5. The third embedded part 6 includes a third embedded steel plate 11 and a plurality of third embedded steel bars 12 welded to the third embedded steel plate 11 by perforation plug welding. The third embedded steel bars 12 are L-shaped. Figure 2 As shown, the steel staircase unit at the bottom is welded to the first embedded steel plate 7 in the concrete floor 22 through the steel ladder beam 1, and a brick step is provided between the steel staircase unit at the bottom and the concrete floor 22, and the brick step is against the vertical steel plate on the side.

[0044] like Figure 1As shown, the horizontal unit includes a suspended horizontal unit 18 and a fixed horizontal unit 19. The suspended horizontal unit 18 is connected between two adjacent steel staircase units, and the fixed horizontal unit is connected between the top steel staircase unit and the floor beam of the upper layer. In this embodiment, the suspended horizontal unit 18 and the fixed horizontal unit 19 have the same structure. Figure 8 As shown, each comprises two horizontal steel beams 20, two horizontal steel longitudinal beams 21, a bottom steel plate and a top steel pedal 34 that are welded to each other. The two ends of the horizontal steel beam 20 in the suspended horizontal unit 18 are respectively welded to the steel ladder beams 1 on the same side of the two adjacent steel stair units, and the two ends of the horizontal steel longitudinal beam 21 are respectively welded to the two steel ladder beams 1 of the same steel stair unit. The bottom steel plate and the top steel pedal 34 are respectively welded between the bottom and top of the two horizontal steel beams 20 and the two horizontal steel longitudinal beams 21. The top steel pedal 34 in the suspended horizontal unit 18 can be stepped on directly by people. Figure 13 As shown, the two ends of the horizontal steel beam in the fixed horizontal unit 19 are respectively welded to the second embedded parts 5 in the corresponding floor beam and the steel ladder beam on one side of the corresponding steel staircase unit, and the top steel tread 34 in the fixed horizontal unit 19 is welded to the second embedded steel plate 9 in the corresponding floor beam, and the height space between the top steel tread 34 and the surface of the corresponding floor beam is also poured with concrete to form a second concrete tread 35.

[0045] In this embodiment, the horizontal steel beam 20 and the horizontal steel beam 21 are both H-shaped steel, each including two upper and lower flanges and a middle web. Among them, multiple reinforcing plates 23 are welded between the two flanges and the web of the horizontal steel beam 20, such as Figure 8 、 Figure 9 and Figure 12 As shown, the horizontal steel beam 20 and the horizontal steel longitudinal beam 21 are vertically welded, and a unit connecting plate 25 is fastened between the web of the horizontal steel longitudinal beam 21 and the corresponding reinforcing plate 23 on the horizontal steel beam 20 by high-strength bolts 24.

[0046] like Figure 11 As shown, the steel ladder column 3 is a box-type structure, including a box-type column body 26 and a plurality of reinforcing ribs 27 welded inside the box-type column body 26 and arranged at intervals along the up-down direction. The box-type column body 26 is welded to the horizontal steel beam of the suspended horizontal unit. The box-type column body includes four steel side plates extending along the up-down direction and welded end to end in the circumferential direction. The bottoms of the four steel side plates are welded to the first embedded steel plate in the concrete floor.

[0047] The assembly process of the steel ladder column 3 includes: (1) paneling: before cutting the steel plate, the plate is spliced ​​in the length direction. The steel plate splicing is generally only performed in the length direction, and the welding of the splicing seam is generally carried out by gantry submerged arc welding or trolley-type submerged arc automatic welding; (2) steel plate leveling: before cutting the steel plate, the steel plate needs to be leveled, and the leveling is performed on special equipment; the leveling prevents the unevenness of the steel plate from affecting the processing quality, and the leveling is conducive to improving the density of the steel plate; (3) cutting: the cutting is carried out by CNC automatic flame cutting; the steel plate must also be inspected and tested, and can only be cut after confirmation of compliance. In order to ensure the edge quality of the cut plate, prevent the deformation of the strip material, and avoid lateral bending that is difficult to repair, the plate is cut vertically from both sides at the same time so that both sides of the plate are heated at the same time; (4) Steel plate beveling: The steel plate beveling is carried out on a special imported steel plate beveling machine. The beveling of steel plates of different thicknesses should be strictly in accordance with the welding process weld requirements; (5) Marking and positioning: Using the assembly template with the top end face milling position as the reference, mark the assembly lines such as partitions and the positions of electroslag welding holes on the inner and outer sides of the lower wing plate and the two webs, and punch holes, mark the center line and edge processing line; (6) Upper cover assembly welding: Before the upper cover is assembled, the previous process needs to be inspected, and the cover plate will be assembled after passing the inspection; the cover plate is completed on a special box-type component assembly machine; the box-type component welding is mainly the welding of four main welds, and the welding adopts gate-type fully automatic submerged arc welding. The two welds are welded simultaneously, in the same direction, and with the same welding current. After welding, it needs to be corrected. Since the steel plate of the component is relatively thick, local heating annealing after welding is mainly used to eliminate the concentrated stress. (7) Box-type electroslag welding: Before welding, electric heating and heat treatment are carried out according to the plate thickness and process requirements. First, the box-type internal fillet weld is welded semi-automatically using CO2 gas shielding, and then the four main welds are welded symmetrically in sequence on the gantry-type fully automatic submerged arc machine on the box-type component automatic production line. After welding, the welds are repaired and non-destructive testing is performed. After correction, they are submitted for inspection. (8) End milling: End milling is machined using special end milling equipment. Box-type end milling is mainly used as a reference for the next splicing and welding. (9) Rust removal and painting: Rust removal and painting are carried out after the entire box-type component is completed. Rust removal is mainly carried out using shot blasting technology, which is carried out in a fully automatic and fully enclosed shot blasting machine. Only primer is applied to the on-site welding splicing parts.

[0048] like Figure 1 、 Figure 8 、 Figure 9 and Figure 10As shown, the steel hanger 2 includes a rod body 29, end plates 30 connected to both ends of the rod body 29, and lifting ear plates 31 connected to the opposite sides of the two end plates 30. Among them, the lifting ear plate 31 located at the upper end of the rod body 29 is welded to the corresponding third embedded steel plate 11, and two spaced support hangers 33 are welded to the side of the horizontal steel beam 20 facing away from the horizontal steel longitudinal beam 21 at the position corresponding to the steel hanger 2. The support hangers 33 extend out of the horizontal steel beam 20, and the lifting ear plate 31 located at the lower end of the rod body 26 is used to be inserted between the two support hangers 33. A pin shaft 32 is vertically inserted between the two support hangers 33 and the lifting ear plate 31.

[0049] The present invention effectively combines steel structure with concrete pouring, which not only ensures the strength of the entire segmented steel staircase structure itself, but also ensures a firm connection with the floor beams and concrete floors. During construction, the steel structure of the steel staircase can be welded and assembled on the ground, and the concrete structure on the steel staircase can be installed after the steel staircase is positioned and fixed. Compared with cast-in-place reinforced concrete stairs, the self-weight of the entire steel staircase structure is small, and the amount of concrete used is small. The horizontal steel plates, vertical steel plates and side sealing steel plates of each step can serve as formwork by themselves, without the need for additional formwork or steel bar tying. The construction is simple and the construction period is short. The processing accuracy of each steel component of the steel staircase is easy to ensure, and when the error is large, it can be corrected on the ground, reducing rework time and ensuring high quality controllability.

[0050] The embodiments of the present invention described above do not limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A segmented steel staircase structure, characterized in that: include: A steel staircase unit, installed between two upper and lower adjacent floors, is provided with multiple sections, each section of the steel staircase unit comprising two steel ladder beams spaced side by side, a bottom steel cover plate connected to the bottom of the two steel ladder beams, and a plurality of steps connected to the top of the two steel ladder beams, each step comprising a horizontal steel plate and a vertical steel plate welded to each other, and side cover steel plates located at both ends of the horizontal steel plate, the two side cover steel plates being welded to opposite ends of the two steel ladder beams, the top heights of the vertical steel plate and the side cover steel plates being higher than the top height of the horizontal steel plate, a casting trough being formed between the vertical steel plate, the horizontal steel plate, and the two side cover steel plates, the casting trough being poured with concrete, and the concrete surface being flush with the tops of the vertical steel plate and the side cover steel plates; The horizontal unit includes a suspended horizontal unit and a fixed horizontal unit. The suspended horizontal unit is connected between two adjacent steel staircase units, and the fixed horizontal unit is connected between the top steel staircase unit and the floor beam of the upper layer. The first embedded part is used to be embedded in the floor beam or concrete floor of the lower layer; The second embedded part is used to be embedded in the floor beam of the upper layer; The third embedded part is used to be embedded in the floor beam at the bottom of the corresponding floor in the building, and the installation height of the third embedded part is higher than the installation height of the second embedded part; Steel ladder columns, the bottom ends of which are welded to the first embedded parts in the concrete floor, and the top ends of which are welded to the corresponding suspended horizontal units; A steel hanger, wherein the top end of the steel hanger is welded to the corresponding third embedded part, and the bottom end of the steel hanger is welded to the corresponding suspended horizontal unit; The first embedded part includes a first embedded steel plate and a plurality of first embedded steel bars welded to the first embedded steel plate by plug welding; the second embedded part includes two second embedded steel plates and a plurality of second embedded steel bars disposed between the two second embedded steel plates, both ends of the second embedded steel bars being connected to the second embedded steel plates by plug welding, and the two second embedded steel plates are embedded on both sides of the beam on the same floor; the third embedded part includes a third embedded steel plate and a plurality of third embedded steel bars welded to the third embedded steel plate by plug welding, and the third embedded steel bars are L-shaped; The suspended horizontal unit has the same structure as the fixed horizontal unit, and both include two horizontal steel beams, two horizontal steel longitudinal beams, a bottom steel plate and a top steel tread that are welded to each other; the two ends of the horizontal steel beam in the suspended horizontal unit are respectively welded to the steel ladder beams on the same side of the two adjacent steel stair units, the two ends of the horizontal steel longitudinal beam are respectively welded to the two steel ladder beams of the same steel stair unit, and the bottom steel plate and the top steel tread are respectively welded between the two horizontal steel beams and the bottom and top of the two horizontal steel beams; the two ends of the horizontal steel beam in the fixed horizontal unit are respectively welded to the second embedded parts in the corresponding floor beam and the steel ladder beam on one side of the corresponding steel stair unit, the top steel tread in the fixed horizontal unit is welded to the second embedded steel plate in the corresponding floor beam, and the height space between the top steel tread and the surface of the corresponding floor beam is poured with concrete; Both the horizontal steel crossbeam and the horizontal steel longitudinal beam are H-shaped steel. Multiple reinforcement plates are welded between the two flanges and the web of the horizontal steel crossbeam. The horizontal steel crossbeam and the horizontal steel longitudinal beam are welded vertically. The web of the horizontal steel longitudinal beam and the corresponding reinforcement plate on the horizontal steel crossbeam are fastened with a unit connection plate by high-strength bolts. The steel hanger includes a rod body, end plates connected to both ends of the rod body and lifting ear plates connected to the opposite sides of the two end plates. The lifting ear plate located at the upper end of the rod body is welded to the corresponding third embedded steel plate. Two spaced support hangers are welded to the position of the steel hanger on the side of the horizontal steel beam facing away from the horizontal steel longitudinal beam. The support hangers extend out of the horizontal steel beam. The lifting ear plate located at the lower end of the rod body is used to be passed between the two supporting hangers. A pin is vertically passed between the two supporting hangers and the lifting ear plate.

2. The sectional steel staircase structure according to claim 1, characterized in that: The steel ladder column is a box-type structure, including a box-type column body and a plurality of reinforcing ribs welded in the box-type column body and arranged at intervals along the up-down direction. The box-type column body is welded to the horizontal steel beam of the suspended horizontal unit. The box-type column body includes four steel side plates extending along the up-down direction and welded end to end in the circumferential direction. The bottoms of the four steel side plates are all welded to the first embedded steel plate in the concrete floor.

3. The sectional steel staircase structure according to claim 1, characterized in that: The steel ladder beam includes multiple spliced ​​beam units, each beam unit includes a steel beam with an H-shaped cross-section, multiple stiffening plates welded between the two flanges of the steel beam, and end side plates welded to the side ends of the two flanges of the steel beam. The corresponding ends of the steel beams of two adjacent beam units are welded together, the end side plates are correspondingly welded, and the two stiffening plates at the corresponding ends of the steel beams are adhered and connected by high-strength bolts.

4. The sectional steel staircase structure according to claim 1, characterized in that: Brick steps are arranged between the steel staircase unit at the bottom and the concrete floor, and the vertical steel plate at the bottom of the steel staircase unit is in contact with the brick steps.

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