Column-free subway station floor punching composite structure frame system and construction method

Abstract

The invention relates to the technical field of rail transit, in particular to a column-free subway station floor punching composite structure frame system and a construction method. The structural frame system comprises a concrete composite beam and concrete composite columns located at the two ends of the concrete composite beam. The concrete combination column comprises a profile steel stand column, and an end plate is arranged at the upper end of the profile steel stand column. The concrete composite beam comprises a main body beam and connecting beams, the connecting beams are located at the two ends of the main body beam, the connecting beams are connected with the profile steel stand columns and are aligned with the end plates, upper steel bars and lower steel bars are further arranged on the upper side and the lower side of the concrete composite beam respectively, the upper steel bars are connected with the soil-back sides of the profile steel stand columns, and the lower steel bars are connected with the soil-back sides of the profile steel stand columns. The lower steel bar penetrates through the profile steel stand column and then is bent. According to the invention, the overall rigidity of the perforated floor is improved, the vertical deformation of the floor is reduced, and the safety during operation is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit, and in particular to a column-free subway station floor opening composite structural frame system and a construction method. Background Art

[0002] In modern urban rail transit systems, the design and construction of subway stations is one of the key links. Subway stations must not only meet the travel needs of passengers, but also take into account factors such as space utilization, wide field of vision and smooth passenger flow.

[0003] In the traditional subway station design, although the column structure is more reasonable in terms of structural stress and economy, it has obvious disadvantages, especially in terms of space utilization, vision, and smooth passenger flow. Since there are columns on the platform, the layout of escalators and stairs is affected by the columns, and the station does not appear to have a wide enough view and space. In addition, the top longitudinal beam of the station will inevitably turn up, which will cause inconvenience to the relocation of municipal pipelines. The top longitudinal beam and middle longitudinal beam that turn down will cause inconvenience to the pipeline layout inside the station.

[0004] Column-free stations have the advantages of transparent space, wide vision, and smooth passenger flow. They have been successfully applied in many rail transit lines in recent years. From the perspective of structural design, column-free stations do not have columns in public areas and have large spans. For the location of escalator holes, the opening width is often close to or exceeds 30% of the net width, which is a large opening design. Therefore, it is necessary to specially design the floor opening structure type and adopt a reasonable structural system to avoid the adverse effects of excessive vertical deformation of the floor caused by large floor openings and weakening of the station's lateral stiffness. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the embodiments of the present invention is to provide a column-free subway station floor opening composite structural frame system and construction method, aiming to solve the technical problems existing in the existing column-free station design, and through innovative structural design, improve the overall stiffness of the floor after the opening, reduce the vertical deformation of the floor, and ensure safety during operation. At the same time, by enhancing the stiffness of the transverse frame system, the seismic performance of the station is improved to adapt to the environment with long-term groundwater action and improve durability. In addition, the construction method is simplified, the construction risk is reduced, and it is convenient for large-scale promotion and application.

[0006] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A composite structural frame system with openings in a column-free subway station floor comprises: a concrete composite beam and concrete composite columns located at both ends of the concrete composite beam; the concrete composite column comprises a steel column, and the upper end of the steel column has an end plate; the concrete composite beam comprises a main beam and a connecting beam, the connecting beam is located at both ends of the main beam, the connecting beam is connected to the steel column and aligned with the end plate, and upper and lower sides of the concrete composite beam are respectively provided with upper and lower steel bars, the upper steel bars are connected to the back-to-soil side of the steel column, and the lower steel bars pass through the steel column and then bend.

[0008] The embodiment of the present invention further provides a construction method of the above-mentioned column-free subway station floor opening composite structural frame system, comprising:

[0009] The steel sections of the concrete composite beams are processed in the factory, and the steel sections of the concrete composite columns are processed in the factory;

[0010] Processing of connection nodes of concrete composite columns and concrete composite beams: When processing composite columns, the connection beams of composite beams are processed together with the steel columns;

[0011] On-site construction of concrete composite columns and composite beams: tying steel bars and pouring concrete for composite columns, splicing composite beams on-site, tying steel bars and pouring concrete for composite beams.

[0012] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0013] 1. The composite structural frame system includes a concrete composite beam and a concrete composite column at both ends thereof. An end plate is arranged at the upper end of the steel column of the concrete composite column. The concrete composite beam is divided into a main beam and a connecting beam, and the connecting beam is connected to the steel column and aligned with the end plate. This design enables the concrete composite beam to form a stable structural system, improving the overall bearing capacity and seismic resistance. The upper and lower skin steel bars arranged above and below ensure the integrity and rigidity of the structure. The connection between the upper skin steel bar and the steel column enhances the bearing capacity of the structure and provides good tensile and bending resistance; and the penetration design of the lower skin steel bar further improves the vertical bearing capacity and optimizes the force distribution of the structure. The composite steel-concrete beam has a large rigidity, which improves the overall rigidity of the floor slab after the opening, reduces the vertical deformation of the floor slab, and can ensure the safety of the escalator and other equipment during the operation period. The composite steel-concrete beam and the composite steel-concrete column form a frame system with large lateral rigidity, which improves the seismic performance within the opening range of the public area.

[0014] 2. The steel column of the present invention is covered with concrete, which is suitable for an environment with long-term groundwater action and has good durability.

[0015] 3. The steel-concrete composite beam is divided into three sections, which reduces the construction risk of hoisting a whole steel beam.

[0016] 4. Reserve connection sleeves at the steel node positions to ensure effective anchorage of the composite beam-column reinforcement.

[0017] 5. The large-span column-free station of the present invention has simple design and construction method, clear force transmission, relatively simple construction, and is convenient for large-scale promotion.

[0018] Advantages of additional aspects of the present invention will be given in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In addition, the spacing or size between each other is exaggerated to show the position of each part, and the schematic diagram is only used for illustration.

[0020] Figure 1 It is a layout diagram of a large-span column-free station floor opening composite structure frame system provided by an embodiment of the present invention;

[0021] Figure 2 It is a large-scale drawing of a connection node between a composite beam and a composite column provided in an embodiment of the present invention;

[0022] Figure 3 is a cross-sectional view of a composite beam 1-1 provided in an embodiment of the present invention;

[0023] Figure 4 is a cross-sectional view of a composite beam 2-2 provided in an embodiment of the present invention;

[0024] Figure 5 It is a reinforcement diagram of a composite beam provided by an embodiment of the present invention;

[0025] Figure 6 It is a schematic diagram of a large-scale transverse connection method of a composite beam provided in an embodiment of the present invention;

[0026] Figure 7 It is a schematic diagram of a composite beam steel sample provided by an embodiment of the present invention;

[0027] Figure 8 It is a schematic diagram of the on-site welding and bolt connection of the composite beam steel provided by an embodiment of the present invention;

[0028] Fig. 9 It is an elevation view of a steel-concrete composite column provided by an embodiment of the present invention;

[0029] Fig.10 It is a reinforcement diagram of a steel-concrete composite column provided by an embodiment of the present invention;

[0030] Fig.11 It is a schematic diagram of a steel-concrete composite column steel sample provided by an embodiment of the present invention;

[0031] In the figure: 1. Concrete composite column; 11. First stiffening rib; 111. Casting hole; 12. Rebar on the back side; 13. Rebar on the front side; 14. End plate; 15. Connecting sleeve; 16. Bearing plate; 17. Pad; 18. Second stiffening rib; 2. Concrete composite beam; 21. Main beam; 22. First connecting plate; 23. Connecting beam; 24. Upper skin steel bar; 25. Lower skin steel bar; 26. Second connecting plate; 27. Stud; 28. Reinforcement plate; 281. Opening; 3. Concealed beam; 4. Floor opening; 5. Bottom plate; DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Analysis of defects in existing technology:

[0034] 1. The opening of the floor slab on the first floor of the public area of ​​the station is generally 5.8 meters, the net width inside the station is about 20 meters, the horizontal opening rate is close to or exceeds 30%, and there is a lack of longitudinal beams and central columns. Therefore, the vertical deformation of the floor slab is often greater than that of the column solution, which is a higher risk.

[0035] 2. There is currently no unified approach to the problem of a large rate of column-free openings. Conventionally, only reinforced reinforced concrete beams are set around the holes, but their rigidity is relatively weak and insufficient to offset the weakening of floor slab rigidity caused by the openings.

[0036] 3. The reinforced concrete transverse beams around the large opening bear large escalator loads and other equipment loads. The lower surface of the vertical height protrudes more than 500mm from the bottom of the floor slab, affecting the wind flow area of ​​the track top air duct directly below the floor slab. It is necessary to increase the overall height of the platform layer, thereby increasing the buried depth of the station, which is not conducive to the risk and investment control of foundation pit excavation.

[0037] 4. The two ends of the reinforced concrete transverse beams around the large openings fall on the hidden columns of the outer walls. The transverse frame system formed by the transverse beams and hidden columns has weak rigidity and cannot effectively resist earthquake effects, affecting the seismic bearing capacity of the structure.

[0038] Example 1

[0039] In order to solve the above technical problems, this embodiment proposes a column-free subway station floor opening composite structural frame system. Figure 1 As shown, it includes: a concrete composite beam 2 and concrete composite columns 1 located at both ends of the concrete composite beam 2, there are two composite beams, there are four composite columns, reinforced concrete hidden beams 3 are also arranged between the composite beams, and the floor opening 4 is located between the composite beams and the hidden beams 3.

[0040] like Figure 2 , Figure 8 As shown, the concrete composite column 1 includes a steel column, and the upper end of the steel column has an end plate 14; the concrete composite beam 2 includes a main beam 21 and a connecting beam 23, and the connecting beam 23 is located at both ends of the main beam 21. The connecting beam 23 is connected to the steel column and aligned with the end plate 14. The upper and lower sides of the concrete composite beam 2 are also respectively provided with an upper skin steel bar 24 and a lower skin steel bar 25, and the upper skin steel bar 24 is connected to the back soil side of the steel column, and the lower skin steel bar 25 passes through the steel column and then bends.

[0041] The composite structural frame system includes a concrete composite beam 2 and a concrete composite column 1 at both ends thereof. An end plate 14 is provided at the upper end of the steel column of the concrete composite column 1. The concrete composite beam 2 is divided into a main beam 21 and a connecting beam 23, and the connecting beam 23 is connected to the steel column and aligned with the end plate 14. This design enables the concrete composite beam 2 to form a stable structural system, improving the overall bearing capacity and seismic resistance. The upper and lower skin steel bars 24 and the lower skin steel bars 25 arranged above and below ensure the integrity and rigidity of the structure. The connection between the upper skin steel bars 24 and the steel column enhances the bearing capacity of the structure and provides good tensile and bending resistance; and the penetration design of the lower skin steel bars 25 further enhances the vertical bearing capacity and optimizes the force distribution of the structure. The composite steel-concrete beam has a large rigidity, which improves the overall rigidity of the floor slab after the opening, reduces the vertical deformation of the floor slab, and can ensure the safety of the escalator and other equipment during the operation period. The composite steel-concrete beam and the composite steel-concrete column form a frame system with large lateral rigidity, which improves the seismic performance within the opening range of the public area.

[0042] The main beam 21 and the connecting beam 23 are both I-beams, and the main beam 21 and the connecting beam 23 are butt-jointed. A first connecting plate 22 is provided on the upper side of the upper edge plates of the main beam 21 and the connecting beam 23, and the first connecting plate 22 is connected to the upper edge plates of the main beam 21 and the connecting beam 23. Second connecting plates 26 are provided on both sides of the webs of the main beam 21 and the connecting beam 23, and the second connecting plate 26 is connected to the webs of the main beam 21 and the connecting beam 23.

[0043] like Figure 3, Figure 4 As shown, a first connecting plate 22 is provided on the upper side of the upper edge plate of the main beam 21 and the connecting beam 23. The purpose of this design is to increase the connection strength between the beams and ensure the overall rigidity of the entire frame system. The provision of the second connecting plate 26 provides additional support for the web of the I-beam, making the force on the beam more uniform and effectively reducing local stress concentration, thereby improving the safety and stability of the structure. In addition, the docking of beams and the configuration of the connecting plates can simplify the construction process, improve construction efficiency, and ensure reliable connection between components.

[0044] In another embodiment, the I-beam of the transverse steel-concrete composite beam 2 can be adjusted to an H-beam, and the number of steel pieces can be adjusted according to calculation. The end of the transverse steel-concrete composite beam 2 is 2 meters, which is generally not less than the composite beam height.

[0045] A connecting sleeve 15 is provided on the soil-proof side of the upper side of the end plate 14 of the steel column, and the upper skin steel bar 24 is connected to the steel column through the connecting sleeve 15. A reserved through hole is provided on the lower side of the end plate 14 of the steel column, and the lower skin steel bar 25 passes through the reserved through hole and bends upward. Figure 5 shown.

[0046] The end plate 14 of the steel column is provided with a connecting sleeve 15 to facilitate the connection of the upper steel bar 24. The reserved perforation design provides an effective passage path for the lower steel bar 25 and allows it to bend upward. This structure not only simplifies the arrangement of the steel bars, but also ensures a good combination of the steel bars and concrete, and improves the overall bearing capacity of the structure. At the same time, the perforation design can reduce the difficulty of construction, ensure the fixation and stability of the steel bars during concrete pouring, and help improve the safety and quality of construction.

[0047] like Figure 6 , Figure 7 As shown, the upper edge plate and the lower edge plate of the main beam 21 and the connecting beam 23 are both provided with bolts 27. The main beam 21 and the connecting beam 23 are both composed of a plurality of I-beams, which are arranged in parallel, and a reinforcing plate 28 is provided between adjacent I-beams, both ends of the reinforcing plate 28 are connected to the I-beams, and a plurality of reinforcing plates 28 are provided along the length direction of the I-beams, and a hole 281 is also opened on the reinforcing plate 28.

[0048] The parallel arrangement of multiple I-beams can effectively improve the bearing capacity of the overall structure, disperse external loads, and reduce local stress concentration. The setting of the reinforcing plate 28 can not only enhance the rigidity of the I-beam, but also provide additional support, thereby effectively improving the stability of the structure. The design of the opening 281 on the reinforcing plate 28 allows for easy pouring of concrete during the construction process, ensuring the compactness and strength of the concrete. At the same time, the setting of multiple reinforcing plates 28 can make the overall frame show better toughness and strength when dealing with various loads.

[0049] Transverse steel-concrete composite beams 2 are set on both sides of the large opening. The beam width is generally set to 1400mm and the height is 600mm-800mm. The beam steel adopts I-beams, which are generally composed of 4-5 I-beams. Transverse reinforcement plates 28 are set every 1500mm between the I-beams. In order to ensure the quality of the finished product, this part of the composite steel is welded in the factory. In order to increase the friction between the steel and the concrete, shear studs 27 are set on the flange of the steel. Longitudinal steel bars are set on the outside of the composite steel flange, and circumferential stirrups are set in the transverse direction. The transverse composite beam is divided into three sections, and the 2 meters reserved at the end (connecting beam 23) is welded to the steel column node in the factory. The middle section (main beam 21) and the 2 meters reserved at the end are connected at the construction site by high-strength bolts, connecting plates and flange on-site welding.

[0050] Two end plates 14 are provided at the upper end of the steel column, and the connecting beam 23 has an upper edge plate and a lower edge plate, and the two end plates 14 are aligned with the upper edge plate and the lower edge plate respectively. The double end plate 14 design improves the stability of the column, enabling it to better withstand the load from the beam. At the same time, this design can effectively distribute the load, reduce the pressure on the column, and improve the safety factor of the structure. During the construction process, ensuring the alignment of the end plate 14 with the beam will help improve the accuracy and reliability of the connection, thereby enhancing the overall strength of the entire frame.

[0051] The steel column is an H-shaped steel, including an edge plate and a web plate. First stiffening ribs 11 are arranged in the edge plate on both sides of the web plate. Casting holes 111 (such as Fig.11 As shown), the size of the stiffening ribs and the casting holes 111 can be adjusted according to actual conditions.

[0052] The design of the first stiffening rib 11 improves the overall rigidity and bearing capacity of the column, ensuring the safety of the structure during long-term use. At the same time, the design of the pouring hole 111 can improve the density of concrete when pouring, ensuring the strength and durability of the component.

[0053] The two sides of the steel column are respectively provided with back-to-soil side steel bars 12 and front-to-soil side steel bars 13. The back-to-soil side steel bars 12 pass through the gaps of the beam steel at the beam-column node position. For the steel bars that cannot pass through, a connecting sleeve 15 is provided on the steel beam. Such a design can ensure a good combination of steel bars and concrete during concrete pouring and improve the stress-bearing performance of the overall component. The use of the connecting sleeve 15 further improves the anchoring effect of the steel bars at the node position, enhances the tensile and shear resistance of the structure, and makes the overall structure show better stability and safety when subjected to external loads.

[0054] like Fig. 9 , Fig.10 As shown, the bottom side of the steel column has a bearing plate 16, and the bearing plate 16 is connected to the base plate 5 through anchor bolts. The base plate 5 is provided with a second stiffening rib 18, and a pad 17 is provided at the connection between the anchor bolt and the bearing plate 16, and a nut is installed on the pad 17. The purpose of this design is to improve the connection strength between the column and the foundation, and ensure that the column can safely bear the load from the upper structure. The design of the anchor bolt ensures the stability of the bearing plate 16 and effectively prevents displacement or rotation caused by external force. During the construction process, the setting of the bearing plate 16 can simplify the connection process between the foundation and the column and improve the construction efficiency. At the same time, this design can also effectively disperse the load and improve the overall stability and durability of the structure.

[0055] The composite column steel is H-shaped steel, and the I-shaped steel is a single piece, which is a wide flat steel. The total width of the single-side flange is 1100mm, and the height of the steel web is 520mm. In order to improve the overall rigidity of the I-shaped steel, a transverse reinforcement plate 28 is set every 1500mm, and two pouring exhaust holes with a diameter of 50mm are set on each side of the reinforcement plate 28 to ensure that the concrete is poured densely.

[0056] The top of the steel-concrete composite column 1 is welded to the top of the floor slab in the factory with the transverse steel-concrete composite beam 2. A 2-meter length is reserved at the end of the transverse steel-concrete composite beam 2. After the steel of the steel-concrete composite column 1 is welded in the factory, it is transported to the site and welded to the middle section of the transverse steel beam.

[0057] Example 2

[0058] This embodiment proposes a construction method of a column-free subway station floor opening composite structural frame system based on Embodiment 1, comprising the following steps:

[0059] 1) Design and factory processing of steel-concrete composite beam 2.

[0060] The first step is to follow Figure 7As shown, two 200mm×40mm flanges and 320×30 steel plates are welded into I-beams. In order to increase the shear resistance of the steel, φ19mm×80mm bolts (shear studs 27) need to be welded every 150mm on the outside of the flanges. In the second step, the four processed I-beams are connected every 1500mm through reinforcing plates 28 (270mm×320mm×20mm). To ensure that the concrete can be poured densely, a 100mm×100mm hole 281 needs to be reserved in the connecting plate. At the same time, 320mm×85mm×20mm stiffening ribs are set every 1500mm on the outside of the I-beam.

[0061] 2) Design and factory processing of steel-concrete composite columns 1.

[0062] The first step is to follow Fig.11 As shown, two 1100mm×40mm flanges and 520mm×30mm steel plates are welded into H-shaped steel. In order to increase the shear resistance of the steel, φ19mm×80mm bolts are welded every 150mm on the outside of the flange. In the second step, 320mm×85mm×20mm stiffening ribs are set every 1500mm in the gap between the processed H-shaped steel flange and the web. Two φ50mm casting holes 111 are reserved on each side of the stiffening rib.

[0063] 3) Design and factory processing of steel-concrete composite column 1 and composite beam nodes.

[0064] The top of the steel column is provided with an end plate, such as Figure 2 , with a thickness of 20 mm, and two φ50 mm casting holes 111 are reserved on each side end plate 14. Fig.11 . At the same time, in order to avoid the reduction of flange stiffness due to steel welding, two end plates 14 are set in the node and aligned with the two welded positions of the composite steel. A φ40mm perforation is reserved at the flange of the steel column at the node at the perforation position of the composite beam lower skin reinforcement 25. A connecting sleeve 15 is set at the height of the composite beam upper skin reinforcement 24 to anchor the composite beam upper skin reinforcement 24. At the same time, a connecting sleeve 15 is reserved in the node of the composite beam to anchor the longitudinal reinforcement on the back soil side of the composite column. When processing the composite column, the 2000mm length of the end of the composite beam together with the beam-column node must be cut according to Figure 2 Request to process together.

[0065] 4) On-site construction of steel-concrete composite columns 1 and composite beams.

[0066] The first step is to tie the steel bars and pour the concrete for the composite columns. When pouring the subway slab 5, reserve the column foot bolts at the node between the side wall and the slab 5. Fig. 9 Positioning fixed. Fig.10 It is required to set longitudinal steel bars and circumferential stirrups and pour composite column concrete to the construction joint below the beam-column node.

[0067] The second step is the on-site splicing of the composite beam. In order to facilitate construction and ensure processing quality, the composite beam is generally processed in three sections. The 2000mm long steel (connecting beam 23) at the support and the same steel beam-column node are processed in the factory. The middle section (main beam 21) is spliced ​​on site according to Figure 8 Requirements, connected by connecting plates, bolts and on-site welding.

[0068] The third step is to tie the composite beam reinforcement and pour concrete. Figure 5 According to the requirements, the longitudinal reinforcement and circumferential stirrups are tied. At the node position, the upper reinforcement 24 is connected to the flange of the composite column steel section through the connecting sleeve 15. The lower reinforcement 25 passes through the steel section through the reserved hole of the composite column and is anchored into the node. After the reinforcement is tied, the concrete of the composite beam and the node position is poured. At this point, the construction of the large-span column-free subway station floor opening composite structure frame system is completed.

[0069] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A column-free subway station floor opening composite structural frame system, characterized in that: include: A concrete composite beam and concrete composite columns located at both ends of the concrete composite beam; The concrete composite column comprises a steel column, and the upper end of the steel column has an end plate; The concrete composite beam includes a main beam and a connecting beam, wherein the connecting beam is located at both ends of the main beam, connected to the steel column and aligned with the end plate, and upper and lower sides of the concrete composite beam are respectively provided with upper and lower steel bars, wherein the upper steel bar is connected to the back-to-soil side of the steel column, and the lower steel bar passes through the steel column and then is bent.

2. The column-free subway station floor opening composite structural frame system according to claim 1, characterized in that: The main beam and the connecting beam are both I-beams, and the main beam and the connecting beam are butt-jointed. A first connecting plate is arranged on the upper side of the upper edge plates of the main beam and the connecting beam, and the first connecting plate is connected to the upper edge plates of the main beam and the connecting beam. Second connecting plates are arranged on both sides of the webs of the main beam and the connecting beam, and the second connecting plate is connected to the webs of the main beam and the connecting beam.

3. The column-free subway station floor opening composite structural frame system according to claim 1, characterized in that: A connecting sleeve is provided on the soil-receiving side of the upper end plate of the steel column, and the upper steel bar is connected to the steel column through the connecting sleeve. A reserved through hole is provided on the lower side of the end plate of the steel column, and the lower steel bar passes through the reserved through hole and bends upward.

4. The column-free subway station floor opening composite structural frame system according to claim 2, characterized in that: The upper edge plates and lower edge plates of the main beam and the connecting beam are both provided with bolts.

5. The column-free subway station floor opening composite structural frame system according to claim 1, characterized in that: The main beam and the connecting beam are both composed of a plurality of I-beams, which are arranged in parallel. Reinforcing plates are arranged between adjacent I-beams, both ends of the reinforcing plates are connected to the I-beams, and a plurality of reinforcing plates are arranged along the length direction of the I-beams, and openings are also opened on the reinforcing plates.

6. The column-free subway station floor opening composite structural frame system according to claim 1, characterized in that: Two end plates are arranged at the upper ends of the steel columns, and the connecting beam has an upper edge plate and a lower edge plate, and the two end plates are aligned with the upper edge plate and the lower edge plate respectively.

7. The column-free subway station floor opening composite structural frame system according to claim 1, characterized in that: The steel column is an H-shaped steel, including an edge plate and a web plate. First stiffening ribs are arranged inside the edge plate on both sides of the web plate, and casting holes are reserved on the first stiffening ribs.

8. The column-free subway station floor opening composite structural frame system according to claim 1, characterized in that: The two sides of the steel column are respectively provided with steel bars on the back side and the steel bars on the front side. The steel bars on the back side pass through the gaps in the beam steel at the beam-column node. For the steel bars that cannot pass through, connecting sleeves are provided on the steel beam.

9. The column-free subway station floor opening composite structural frame system according to claim 1, characterized in that: The bottom side of the steel column is provided with a bearing plate, which is connected to the bottom plate through anchor bolts. A pad is arranged at the connection between the anchor bolts and the bearing plate, and a nut is installed on the pad.

10. A construction method for a column-free subway station floor opening composite structural frame system according to any one of claims 1 to 9, characterized in that: include: The steel sections of the concrete composite beams are processed in the factory, and the steel sections of the concrete composite columns are processed in the factory; Processing of connection nodes of concrete composite columns and concrete composite beams: When processing composite columns, the connection beams of composite beams are processed together with the steel columns; On-site construction of concrete composite columns and composite beams: tying steel bars and pouring concrete for composite columns, splicing composite beams on-site, tying steel bars and pouring concrete for composite beams.

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