Beam-column connection node, fabricated steel pipe concrete frame and building

Abstract

The utility model relates to the technical field of fabricated building, especially relates to a beam column connecting joint, fabricated steel pipe concrete frame and building. The beam column connecting joint includes vertical component, square tube steel beam and reinforcing component, the vertical component includes upper steel pipe and lower steel pipe with notched side wall, and opposite sides of adjacent notches form connecting end, the square tube steel beam is horizontally inserted in the notched and is connected with the connecting end, the top surface of square tube steel beam is equipped with the gap, the reinforcing component includes reinforcing element and two connecting plates, the connecting plate is symmetrically arranged in the upper and lower ends of the notched along the vertical direction, and the end of connecting plate protrudes the side wall of lower steel pipe and covers the gap. The utility model provides the scheme, and the structure design of vertical component, square tube steel beam and reinforcing component is optimized, the contradiction of steel pipe concrete beam column node area stress performance and construction convenience is solved fundamentally, and the organic unity of strong node and fast construction is realized.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building technology, and in particular to a beam-column connection node, a prefabricated steel-concrete composite frame and building. Background Technology

[0002] In building structural systems, reinforced concrete structures dominate due to their mature technology and reasonable cost. For large-span, heavy-load, or high-rise buildings, steel structures are used due to their high strength and ease of construction. To combine the advantages of both materials, steel-concrete composite structures have developed into an important structural form. Through the synergistic work of the steel tube and the core concrete, they possess high load-bearing capacity, good ductility, and excellent seismic performance. In existing systems, steel-concrete composite structures are mostly used for vertical load-bearing components (such as columns), while horizontal components (such as beams) typically still use traditional reinforced concrete beams or steel beams.

[0003] To fully realize the performance potential of steel-concrete composite materials, constructing an all-steel-concrete composite structure system is an ideal direction for technological development. Utility Model Content

[0004] To overcome the problems existing in related technologies, this utility model provides a beam-column connection node. By optimizing the structural design of vertical components, square tube steel beams and reinforcing components, it solves the contradiction between the stress performance and construction convenience of the steel tube concrete beam-column joint area, and achieves the organic unity of strong joint and fast construction.

[0005] The first aspect of this utility model provides a beam-column connection node, comprising: A vertical component includes an upper steel pipe and a lower steel pipe arranged vertically. The lower steel pipe has a slot on its side wall that extends axially downward from the top, and the opposite sides of adjacent slots form a connecting end. A square tube steel beam is horizontally inserted into a slot and fixedly connected to the connecting end; a notch is opened on the top surface of the square tube steel beam near the slot. The reinforcing component includes a reinforcing element and two connecting plates; the connecting plates are located inside the lower steel pipe and are symmetrically arranged at the upper and lower ends of the slot in the vertical direction, and the ends of the connecting plates extend out of the side wall of the lower steel pipe and cover the notch; the square tube steel beam is sandwiched between the two connecting plates and is fixedly connected to the connecting plates; the reinforcing element is used to enhance the structural strength of the top of the lower steel pipe.

[0006] In some embodiments, the top surface of the square tube steel beam is provided with a plurality of first casting holes spaced apart, and the central area of ​​the connecting plate is provided with a second casting hole.

[0007] In some embodiments, a positioning plate is also included, which is coaxially connected to a connecting plate located at the lower end of the slot, and the positioning plate is provided with a third pouring hole that matches the size of the second pouring hole.

[0008] In some embodiments, the reinforcing element includes a reinforcing plate and a positioning member. The positioning member is disposed on the inner top wall of the square tube steel beam and aligned with the notch. The positioning member has a recess for engaging the reinforcing plate. The reinforcing plate is flush with the side wall of the steel pipe below. The reinforcing plate is welded and fixed to the connecting plate and the square tube steel beam respectively.

[0009] In some embodiments, the positioning element includes a U-shaped strip and two limiting strips, the two limiting strips being respectively disposed opposite to the ends of the U-shaped strip.

[0010] In some embodiments, the reinforcing element includes an inner liner and a mounting component. The mounting component has a U-shaped structure and is located on the inner top wall of the square tube steel beam, aligned with a notch. The side wall of the inner liner has a slot for fitting the groove. The slot extends axially upward from the bottom end of the inner liner, and the opposite sides of adjacent slots form reinforcing ends. The reinforcing ends overlap with the connecting ends. The inner liner is embedded in the lower steel pipe and is welded and fixed to the connecting plate and the lower steel pipe, and is fixedly connected to the upper steel pipe.

[0011] In some embodiments, the reinforcing element includes a reinforcing plate, the connecting plate has a square structure, the four corners of the connecting plate have insertion holes, the connecting end has insertion holes, the two ends of the reinforcing plate are welded and fixed to the connecting plate, and one side of the connecting end is welded and fixed. The end of the connecting end extends from the connecting plate on the top surface of the square tube steel beam; the upper steel pipe is provided with a mounting plate that covers the groove; the mounting plate and the upper steel pipe are both welded and fixed to the connecting end.

[0012] In some embodiments, each of the connecting ends is connected to at least two reinforcing plates, the sum of the cross-sectional areas of the reinforcing plates being greater than or equal to the cross-sectional area of ​​the slot.

[0013] The second aspect of this utility model provides a prefabricated steel-concrete composite frame, which is formed by overlapping the above-mentioned beam-column connection nodes in the horizontal and vertical directions.

[0014] The third aspect of this utility model provides a building comprising the aforementioned prefabricated steel-concrete composite frame.

[0015] The technical solution provided by this utility model can include the following beneficial effects: The improved technical solution for the beam-column connection node provided by this utility model has the following advantages: The steel-concrete composite beam-column connection node provided by this utility model features a square steel beam horizontally inserted into the groove of the lower steel pipe, forming a multi-dimensional force transmission system with the connection ends on both sides of the groove and the symmetrically arranged connection plates inside. The connection ends bear the horizontal shear force, while the connection plates transmit the bending moment, avoiding the problems of force dispersion or stress concentration in traditional nodes. The reinforcing element specifically strengthens the structural strength of the top of the lower steel pipe, and combined with the connection plates covering and fixing the notch, the stiffness of the node area far exceeds that of the simplified splicing node, satisfying the seismic design principle of strong node and weak component. Attached Figure Description

[0016] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0017] Figure 1 This is a structural schematic diagram of the beam-column connection node shown in Embodiment 1 of this utility model; Figure 2 This is an exploded view of the beam-column connection node shown in Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the reinforcing element shown in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram showing the cooperation between the reinforcing element and the square tube steel beam in Embodiment 1 of this utility model; Figure 5 This is a structural schematic diagram of the beam-column connection node shown in Embodiment 2 of this utility model; Figure 6 This is an exploded view of the beam-column connection node shown in Embodiment 2 of this utility model; Figure 7 This is a schematic diagram showing the fit between the mounting component and the square tube steel beam in Embodiment 2 of this utility model; Figure 8 This is a structural schematic diagram of the beam-column connection node shown in Embodiment 3 of this utility model; Figure 9 This is an exploded view of the beam-column connection node shown in Embodiment 3 of this utility model; Figure 10 This is a schematic diagram of the prefabricated steel-concrete composite frame shown in Embodiment 4 of this utility model.

[0018] Figure label: 1. Upper steel pipe; 2. Lower steel pipe; 3. Groove; 4. Connecting end; 5. Square steel beam; 6. Notch; 7. Reinforcing element; 8. Connecting plate; 9. First pouring hole; 10. Second pouring hole; 11. Positioning plate; 12. Reinforcing plate; 13. Positioning component; 14. Inner lining pipe; 15. Installation component; 16. Reinforcing plate; 17. Prefabricated steel-concrete composite frame. Detailed Implementation

[0019] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0020] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0021] Example 1 Embodiment 1 of this utility model proposes a beam-column connection node, aiming to solve the strength and precision problems of beam-column connections in steel-concrete composite structures, and to achieve high-strength collaborative stress and efficient assembly. For example... Figures 1 to 4 As shown, the beam-column connection node includes a vertical member, a square steel tube beam 5, and a reinforcing member.

[0022] The vertical components consist of an upper steel pipe 1 and a lower steel pipe 2 arranged vertically, which work together to bear the vertical load. The lower steel pipe 2 is the core of the vertical load-bearing structure, and its side wall has a slot 3 extending axially downward from the top. The slot 3 is used to accommodate the square tube steel beam 5. The slot 3 and the square tube steel beam 5 are clearance-fitted and fixed by welding. The opposite side walls of adjacent slots 3 of the lower steel pipe 2 form a connecting end 4, providing a support interface for welding or bolting the square tube steel beam 5. The upper steel pipe 1 and the lower steel pipe 2 are coaxially connected to bear the load transferred from the superstructure. Concrete is injected from the top of the upper steel pipe 1 and filled into the interior of the lower steel pipe 2 through the second pouring hole 10 of the connecting plate 8, forming a steel-concrete composite column structure, which can effectively improve the load-bearing capacity and stiffness of the vertical components.

[0023] In the prefabricated steel-concrete composite frame 17 system, the number of slots 3 in the lower steel pipe 2 can be set to 2, 3, or 4 to adapt to the stress requirements of different spatial locations in the steel-concrete composite frame 17 system. Specifically, in the frame system, the lower steel pipe 2 with different numbers of slots 3 corresponds to different column functions. For example, the lower steel pipe 2 with 2 slots 3 is suitable for the four corner columns of the frame, where only two orthogonal side beams need to be connected to meet the bidirectional stress requirements of the corners; the lower steel pipe 2 with 3 slots 3 is suitable for the side span columns of the frame, where two orthogonal side beams and one inner beam need to be connected to bear the triaxial stress of the side span area; the lower steel pipe 2 with 4 slots 3 is suitable for the middle span columns of the frame, where four orthogonal inner beams need to be connected to achieve four-directional coordinated stress in the core area.

[0024] The square tube steel beam 5 is horizontally inserted into the groove 3 of the lower steel pipe 2 and fixedly connected to the connecting end 4. A notch 6 is provided on the top surface of the square tube steel beam 5 near the groove 3. This notch 6 provides a covering space for the end of the connecting plate 8, ensuring that the upper steel pipe 1 is flush with the steel beam. The top surface of the square tube steel beam 5 has several spaced-apart first pouring holes 9 for injecting concrete to fill the interior of the steel beam, forming a steel-concrete composite beam.

[0025] The positioning plate 11 is coaxially connected to the connecting plate 8 at the lower end of the slot 3, which helps to limit the insertion depth of the square tube steel beam 5. The positioning plate 11 is provided with a third pouring hole that matches the size of the second pouring hole 10, so that the concrete of the upper steel pipe 1 can flow into the lower steel pipe 2 through the second pouring hole 10 and the third pouring hole. The positioning plate 11 and the lower connecting plate 8 can be prefabricated in the factory to improve the efficiency of on-site construction.

[0026] The reinforcing member compensates for the strength loss at the slot 3 of the lower steel pipe 2, thereby enhancing the rigidity of the beam-column connection. The reinforcing member includes connecting plates 8 and reinforcing elements 7. There are two connecting plates 8, located inside the lower steel pipe 2 and symmetrically arranged at the upper and lower ends of the slot 3 along the vertical direction. The ends of the connecting plates 8 extend beyond the sidewalls and cover the notches 6 of the square steel beam 5, clamping the square steel beam 5 in the middle and welding it for a fixed connection. A second pouring hole 10 is provided in the central area of ​​the connecting plate 8 for filling the interior of the lower steel pipe 2 with concrete.

[0027] Furthermore, the reinforcing element 7 includes a reinforcing plate 12 and a positioning element 13. The shape of the reinforcing plate 12 is consistent with the structure of the slot 3, and its thickness is the same as that of the lower steel pipe 2 wall. The reinforcing plate 12 is limited at the end of the square tube steel beam 5 by the positioning element 13 and is flush with the side wall of the lower steel pipe 2. The reinforcing plate 12 is welded and fixed to the connecting plate 8 and the square tube steel beam 5 respectively. In this configuration, the reinforcing plate 12 can be regarded as the restoration structure of the cut part of the slot 3 of the lower steel pipe 2, filling the gap 6 strength short plate and improving the shear resistance of the node. The positioning element 13 is located on the inner top wall of the square tube steel beam 5 and is used to provide an installation reference for the reinforcing plate 12 and support the connecting plate 8. The positioning element 13 has a recessed structure and is composed of a U-shaped strip and two opposing limiting strips. The recessed structure between the U-shaped strip and the limiting strips is used to snap the reinforcing plate 12. In practice, the positioning component 13 can be integrally formed with the steel beam. For example, when manufacturing the square tube steel beam 5, the square tube steel beam 5 can be cut and stamped, or it can be prefabricated by welding in the factory.

[0028] In practical applications, the steel-concrete composite frame is assembled from several vertical members and square steel beams 5. The concrete pouring of the vertical members can be carried out through the uppermost steel pipe 1 at the top of the prefabricated steel-concrete composite frame 17. The concrete is then filled into the interior of each vertical member below through the second pouring hole 10 of each connecting plate 8, thereby forming a steel-concrete composite structure.

[0029] It is understandable that when several vertical components are connected in sequence, the upper steel pipe 1 and the lower steel pipe 2 can be standardized square steel pipe components with the same structure. The top of the square steel pipe component is provided with a slot 3 for connecting the square steel beam 5, and the bottom can be used for installation on the foundation or for connecting adjacent square steel pipe components; both ends of the square steel beam 5 are provided with notches 6 that are structurally identical to the slots 3. Through the precise fit between the notches 6 and the slots 3 of the square steel pipe components, a rigid node for overall stress is formed, ensuring the stability and collaborative stress-bearing capacity of the frame.

[0030] The assembly process for this beam-column connection node is as follows: (1) Fix the grounded lower steel pipe 2 vertically and calibrate the verticality using a level.

[0031] (2) Place the prefabricated lower end connecting plate 8 with positioning plate 11 into the groove 3; use the fit between positioning plate 11 and the inner wall of the steel pipe to calibrate the coaxiality, and weld it along the joint.

[0032] (3) Insert the square tube steel beam 5 with the pre-installed positioning component 13 and reinforcing plate 12 horizontally into the slot 3; limit the insertion depth by positioning plate 11, and adjust the axis of the square tube steel beam 5 so that it is perpendicular to the axis of the steel pipe 2 below.

[0033] (4) The position of the reinforcing plate 12 is calibrated according to the recessed structure of the positioning piece 13; then the joints of the reinforcing plate 12 with the steel beam, the lower connecting plate 8, and the lower steel pipe 2 are welded in sequence, and the continuity of the weld is checked.

[0034] (5) Place the upper connecting plate 8 into the slot 3 so that it is flush with the top surface of the steel beam; weld the joint between the connecting plate 8 and the steel beam and the lower steel pipe 2.

[0035] (6) Place the upper steel pipe 1 coaxially on top of the lower steel pipe 2 and weld it circumferentially along the butt joint to complete the node assembly.

[0036] (7) Assemble the vertical components and square tube steel beams 5 from bottom to top until the entire steel tube concrete frame is completed.

[0037] In this embodiment, the reinforcing plate 12 restores the structure of the groove 3, and the steel-concrete composite beam and steel-concrete composite beam work together to form a multi-path force system, significantly improving the shear resistance of the joints and the overall structural stiffness and vertical bearing capacity. Core components such as the positioning component 13 and the connecting plate 8 can be prefabricated in the factory. Combined with the positioning plate 11 to precisely define the assembly position, the amount of on-site welding work and assembly deviation can be reduced, and the construction cycle can be shortened significantly. When applied to steel-concrete composite frames, the standardized design of components can achieve high interchangeability, thereby adapting to steel-concrete composite frame scenarios with different spans and loads; at the same time, the combined structure optimizes material utilization and reduces waste, and prefabrication and assembly reduce labor costs, combining good economic efficiency and engineering application value.

[0038] Example 2 The core difference between this embodiment and Embodiment 1 lies in the different structural design of the reinforcing component, specifically as follows: Figures 5 to 7 As shown. The reinforcing element 7 consists of an inner liner tube 14 and a mounting component 15. The mounting component 15 has a U-shaped structure, is fixed to the inner top wall of the square tube steel beam 5 and is precisely aligned with the edge of the notch 6; the inner liner tube 14 has a slot on its side wall that matches the slot 3 of the lower steel pipe 2. The slot extends axially upward from the bottom end, and the opposite side walls of adjacent slots form a reinforcing end, which overlaps with the connecting end 4 of the lower steel pipe 2; the inner liner tube 14 is embedded in the lower steel pipe 2 and is welded and fixed to the connecting plate 8 and the lower steel pipe 2 respectively, and is rigidly connected to the upper steel pipe 1.

[0039] Specifically, the mounting component 15 is used to support the connecting plate 8 and can be made of U-shaped cold-formed steel or directly stamped into the inner top wall of the square tube steel beam 5. If it is a separate accessory, it can be welded and fixed to the inner top wall of the square tube steel beam 5 in the factory. The inner lining pipe 14 is preferably made of thick-walled square steel pipe with the same strength as the lower steel pipe 2. The assembly gap between the outer wall and the inner wall of the lower steel pipe 2 is ≤1mm. The main function of the inner lining pipe 14 is to compensate for the local strength loss caused by the opening 3 of the lower steel pipe 2 and improve the circumferential stiffness and torsional performance of the node. At the same time, the reinforcing end of the inner lining pipe 14 overlaps with the connecting end 4 to form a layered stress interface with better shear resistance. Finally, the top end of the inner lining pipe 14 is directly connected to the bottom end of the upper steel pipe 1 to realize the continuous transfer of vertical load and effectively avoid stress concentration.

[0040] The assembly process for this embodiment 2 is as follows: (1) Weld the mounting part 15 to the inner top wall of the square tube steel beam 5; (2) Place the lower connecting plate 8 with positioning plate 11 into the groove 3 of the lower steel pipe 2 and weld it in place; (3) Insert the inner lining tube 14 into the lower steel pipe 2, adjust its position, and then weld it in place; (4) Lift the upper connecting plate 8 to the top of the slot and fix it temporarily; (5) Insert the square tube steel beam 5 into the slot 3, align the area of ​​the connecting plate 8 and the notch 6, and then weld the joints between the connecting plate 8 and the square tube steel beam 5, and between the square tube steel beam 5 and the steel pipe 2 below in sequence. (6) Insert the upper steel pipe 1 into the top of the inner lining pipe 14 and fix it by bolting or welding; (7) The remaining construction steps are the same as in Example 1.

[0041] Example 3 The core difference between this embodiment and Embodiment 1 lies in the different structural design of the reinforcing component, specifically as follows: Figures 8 to 9 As shown. The reinforcing component adopts the form of a reinforcing plate 16 in conjunction with a square connecting plate 8. The combination of the exposed connecting end 4 and the mounting plate of the upper steel pipe 1 optimizes the stress performance of the node. Specifically, the connecting plate 8 is a square structure with insertion holes precisely opened at the four corners by laser, while a second casting hole 10 is reserved in the central area. The connecting end 4 of the lower steel pipe 2 passes through the insertion hole, realizing the coaxial positioning of the connecting plate 8 and the lower steel pipe 2, providing a precise reference for subsequent welding operations. The two ends of the reinforcing plate 16 are welded and fixed to the connecting plate 8, and one side is welded to the connecting end 4, forming a stable cooperative stress system. Each connecting end 4 is connected to at least two reinforcing plates 16. The sum of the cross-sectional areas of all reinforcing plates 16 is greater than or equal to the cross-sectional area of ​​the slot 3, ensuring that the area replenished is greater than the area lost by the lower steel pipe 2 due to the slot 3, ensuring that the node stiffness matches the main structure, and effectively compensating for the local strength loss of the lower steel pipe 2 caused by the slot 3. In addition, the thickness of the reinforcing plate 16 can be adjusted according to actual needs. In practice, the reinforcing plate 16 can be made from the leftover material generated after cutting the groove 3 of the lower steel pipe 2, thereby improving material utilization and reducing waste.

[0042] The end of the connecting end 4 passes through the upper connecting plate 8 on the top surface of the square tube steel beam 5 and is exposed. The bottom of the upper steel pipe 1 is provided with an installation plate matching the number of slots 3. The installation plate covers the slots 3 of the lower steel pipe 2 and seals the node area. After the lower steel pipe 2 is aligned with the upper steel pipe 1, the exposed part of the connecting end 4 is welded together with the installation plate to achieve continuous vertical load transfer and avoid stress concentration.

[0043] In this embodiment, the reinforcing plate 16 can significantly improve the shear resistance of the node, and the combination design of the exposed connection end 4 and the mounting plate further enhances the reliability of the connection between the upper and lower steel pipes, ensuring the overall stability of the structure.

[0044] The assembly process for this embodiment 3 is as follows: (1) Insert the lower connecting plate 8 with the positioning plate 11 into the connecting end 4 and weld it in place; (2) Insert the square tube steel beam 5 into the slot 3, align and calibrate it, and then weld the joints between the square tube steel beam 5 and the lower end connecting plate 8, and between the square tube steel beam 5 and the lower steel pipe 2 in sequence. (3) Insert the upper connecting plate 8 into the connecting end 4, align and calibrate, and then weld and fix it; (4) Welded reinforcing plate 16; (5) Assemble the upper steel pipe 1 with the mounting plate into place, and weld the exposed part of the mounting plate and the connection end 4, and the joint between the upper steel pipe 1 and the connection end 4. (5) The remaining construction steps are the same as in Example 1.

[0045] Example 4 This utility model embodiment further proposes a prefabricated steel-concrete composite frame 17 system based on the beam-column connection nodes described in embodiments 1-3 above. For example... Figure 10 As shown, the system presents a multi-layered, multi-span grid-like spatial structure. Standardized assembly along the horizontal and vertical directions via beam-column connection nodes forms a rigid frame network for overall load-bearing. The prefabricated steel-concrete composite frame 17 forms a single-story planar frame through square steel tube beams 5, and is filled with concrete through the first pouring hole 9. Each square steel tube beam 5 has matching notches 6 at both ends that precisely connect with the slots 3 of the vertical columns, ensuring coordinated load-bearing within the plane. Multi-layer extension is achieved through the coaxial connection of adjacent upper and lower steel tubes 1 and 2. Soil is poured layer by layer through the pouring holes of the upper steel tube 1 at the top of the frame and the connecting plates 8 of each layer, and then sequentially filled into the lower vertical components through the second pouring hole 10, forming continuous steel-concrete composite load-bearing columns and improving the overall load-bearing capacity.

[0046] The prefabricated steel-concrete composite frame 17 system is suitable for high-rise office buildings, heavy industrial plants, commercial complexes, prefabricated houses, and other building projects with high requirements for structural stiffness, construction speed, and seismic performance. It is especially suitable for projects with tight schedules or strict environmental protection requirements. It fully integrates the aforementioned technical advantages of beam-column joints and realizes an integrated solution of factory prefabrication, on-site assembly, efficient stress distribution, and green environmental protection, providing a standardized paradigm for the engineering application of prefabricated steel-concrete composite structures.

[0047] Example 5 Embodiment 5 of this utility model also proposes a building that includes the above-described prefabricated steel-concrete composite frame 17.

[0048] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or improvements to the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A beam-column connection node, characterized in that, include: A vertical component includes an upper steel pipe and a lower steel pipe arranged vertically. The lower steel pipe has a slot on its side wall that extends axially downward from the top, and the opposite sides of adjacent slots form a connecting end. A square tube steel beam is horizontally inserted into a slot and fixedly connected to the connecting end; a notch is opened on the top surface of the square tube steel beam near the slot. The reinforcing component includes a reinforcing element and two connecting plates; the connecting plates are located inside the lower steel pipe and are symmetrically arranged at the upper and lower ends of the slot in the vertical direction, and the ends of the connecting plates extend out of the side wall of the lower steel pipe and cover the notch; the square tube steel beam is sandwiched between the two connecting plates and is fixedly connected to the connecting plates; the reinforcing element is used to enhance the structural strength of the top of the lower steel pipe.

2. The beam-column connection node according to claim 1, characterized in that, The top surface of the square tube steel beam is provided with several spaced first casting holes, and the central area of ​​the connecting plate is provided with second casting holes.

3. The beam-column connection node according to claim 2, characterized in that, It also includes a positioning plate, which is coaxially connected to a connecting plate located at the lower end of the slot, and the positioning plate is provided with a third pouring hole that matches the size of the second pouring hole.

4. The beam-column connection node according to claim 3, characterized in that, The reinforcing element includes a reinforcing plate and a positioning component. The positioning component is located on the inner top wall of the square tube steel beam and aligned with the notch. The positioning component has a recess for engaging the reinforcing plate. The reinforcing plate is flush with the side wall of the steel pipe below. The reinforcing plate is welded and fixed to the connecting plate and the square tube steel beam respectively.

5. The beam-column connection node according to claim 4, characterized in that, The positioning element includes a U-shaped strip and two limiting strips, with the two limiting strips respectively positioned opposite to the ends of the U-shaped strip.

6. The beam-column connection node according to claim 3, characterized in that, The reinforcing element includes an inner liner tube and an mounting component. The mounting component has a U-shaped structure and is located on the inner top wall of the square tube steel beam, aligned with the notch. The side wall of the inner liner tube has a slot for matching the groove. The slot extends axially upward from the bottom end of the inner liner tube, and the opposite sides of adjacent slots form reinforcing ends. The reinforcing ends overlap with the connecting ends. The inner liner tube is embedded in the lower steel pipe and is welded and fixed to the connecting plate and the lower steel pipe, and is fixedly connected to the upper steel pipe.

7. The beam-column connection node according to claim 3, characterized in that, The reinforcing element includes a reinforcing plate, the connecting plate has a square structure, the four corners of the connecting plate have insertion holes, the connecting end has insertion holes, the two ends of the reinforcing plate are welded and fixed to the connecting plate, and one side is welded and fixed to the connecting end. The end of the connecting end extends from the connecting plate on the top surface of the square tube steel beam; the upper steel pipe is provided with a mounting plate that covers the groove; the mounting plate and the upper steel pipe are both welded and fixed to the connecting end.

8. The beam-column connection node according to claim 7, characterized in that, Each of the connecting ends is connected to at least two reinforcing plates, the sum of the cross-sectional areas of the reinforcing plates being greater than or equal to the cross-sectional area of ​​the slot.

9. A prefabricated steel-concrete composite frame, characterized in that, It is formed by overlapping several beam-column connection nodes as described in any one of claims 1 to 8 in the horizontal and vertical directions.

10. A building, characterized in that, Including the prefabricated steel-concrete composite frame as described in claim 9.

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