Frame column and superposed beam connecting joint and construction method thereof

Abstract

The application discloses a frame column and superposed beam connecting joint and a construction method thereof, and the novel connecting joint mainly comprises a superposed beam, a frame column, a connecting cover plate and a post-poured part. The frame column comprises a steel pipe column and a steel pipe concrete column, the superposed beam is placed on a lower connecting ring plate of the steel pipe column, a bottom embedded steel plate of the superposed beam is welded with the lower connecting ring plate of the column, a top embedded steel plate of the superposed beam is welded with an upper connecting ring plate or a wall plate of the steel column through the connecting cover plate, and the gap between the end of the superposed beam and the steel column is filled with concrete, ultra-high performance concrete or grouting material to form an integral whole. Compared with the prior art, the welding connection of the embedded steel plate of the superposed beam and the frame column can reliably transmit force of the top and bottom reinforcement in the joint area, effectively reduces machining and construction links such as wall opening of the steel pipe column, reinforcement and top reinforcement setting of the beam, simplifies the process and improves the efficiency. The frame column and superposed beam connecting joint of the application has clear force transmission path, simple structure and convenient construction, and has performance and construction advantages.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of building technology, and relates to a prefabricated concrete building, in particular to a frame column and laminated beam connecting node and a construction method thereof. BACKGROUND

[0002] Steel pipe concrete column has many advantages in engineering. In terms of mechanical properties, it can take advantage of steel and concrete materials, effectively reduce the cross-sectional size of the component, and improve the practical performance of the building. In addition, it also has advantages such as no formwork in construction. The advantages of prefabricated concrete in processing and construction efficiency and cost are obvious, and the economic and social benefits brought by it make this technology widely used in the construction industry.

[0003] The beam-column joint connection form is the key technology of the steel pipe column-concrete beam structure form. The existing joint connection can be divided into rigid connection, hinged connection and semi-rigid connection. For rigid connection, the common practice is to extend the top reinforcement of the concrete beam into the steel pipe column to enhance the stiffness and bearing capacity of the joint, so as to transfer larger bending moment and shear force. But this method is difficult to construct, needs to open holes on the steel pipe and ensure the accurate position of the concrete beam reinforcement, which is difficult to apply in practice. In addition, for the concrete laminated beam, the top reinforcement is difficult to penetrate due to the length of the reinforcement and high-altitude operation, which increases the construction difficulty. Other forms of joint connection generally have complex joint structure and difficult construction, and are mostly semi-rigid connection, with complex stress performance, and the problem of difficult penetration of the top reinforcement of the laminated beam has not been solved. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a frame column and laminated beam connecting node and a construction method thereof, so as to optimize the joint structure, avoid the problems caused by the opening of the frame column steel pipe and the penetration of the concrete laminated beam reinforcement, improve the construction efficiency and simplify the design method.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is:

[0006] A frame column and laminated beam connecting node, which is implemented as:

[0007] A beam top embedded steel plate is arranged at the top of the beam end of the laminated beam, and a beam bottom embedded steel plate is arranged at the bottom of the beam end, the top reinforcement of the laminated beam is welded to the beam top embedded steel plate, and the bottom reinforcement is welded to the beam bottom embedded steel plate, so as to realize stress transmission;

[0008] A column lower connecting ring plate is welded to the outer wall of the steel pipe of the frame column;

[0009] The composite beam is placed on the column lower connecting ring plate, the beam bottom embedded steel plate is connected with the column lower connecting ring plate through welding, the beam top embedded steel plate is connected with the outer wall of the steel pipe through the connecting cover plate or through the connecting cover plate and the column upper connecting plate welding connection, the effective force transmission of the composite beam steel bar in the node area is realized, and the pipe wall of the steel pipe is avoided to be opened.

[0010] The post-cast part is formed by pouring between the beam end of the composite beam and the pipe wall of the steel pipe.

[0011] That is, the top of the connecting node of the application can adopt two structures, structure one is that the beam top embedded steel plate and the outer wall of the steel pipe are connected through the connecting cover plate and the column upper connecting plate welding connection, and the following is realized:

[0012] The column upper connecting plate is welded on the outer wall of the steel pipe of the frame column, the radial dimension of the column lower connecting ring plate is greater than the radial dimension of the column upper connecting plate;

[0013] The connecting cover plate is placed on the top of the beam top embedded steel plate and the column upper connecting plate, and is welded with the beam top embedded steel plate and the column upper connecting plate through the fillet weld, when the size of the weld does not meet the connection strength requirement, a notch one is opened on the plate surface of the cover plate, and the connection is realized in the form of combination of plug welding connection and fillet weld connection.

[0014] In addition, structure two can also be adopted, that is, the beam top embedded steel plate is directly welded with the outer wall of the steel pipe through the connecting cover plate, at this time, the outer wall of the steel pipe does not need to be welded with the column upper connecting plate, and the following is realized:

[0015] One end of the connecting cover plate is welded on the top of the beam top embedded steel plate, the other end is directly welded with the outer wall of the steel pipe through the bevel butt welding, and an inner ring plate is arranged on the inner wall of the steel pipe corresponding to the connecting cover plate connection position, so as to ensure the reliable force transmission of the node core area.

[0016] In the application, the strength of the beam top embedded steel plate and the connecting cover plate needs to be determined according to the design requirement, the bearing capacity of each section in the node connecting area is ensured to be greater than the bearing capacity of each part of the composite beam body, and the plastic hinge of the beam end is generated in the area outside the range of the beam top embedded steel plate.

[0017] In one embodiment, the beam bottom embedded steel plate is connected with the column lower connecting ring plate through the fillet weld on both sides, when the size of the weld does not meet the connection strength requirement, the size of the beam bottom embedded steel plate is increased along the width direction of the beam section, and a notch two is opened on the part of the beam bottom embedded steel plate beyond the beam width area, and the connection is realized in the form of combination of plug welding connection and fillet weld connection.

[0018] In one embodiment, the top bar is welded on the top surface of the beam top embedded steel plate, and a part welded with the connecting cover plate is left on the top surface of the beam top embedded steel plate in the direction close to the frame column; the bottom bar is welded on the top surface of the beam bottom embedded steel plate.

[0019] In one embodiment, the precast beam body is provided with stirrup one outside the range of the top embedded steel plate and the bottom embedded steel plate, and stirrup two is provided within the range; the constraint area of the stirrup one includes the top bar, the bottom bar and the core concrete therebetween, the stirrup two is located between the top embedded steel plate and the bottom embedded steel plate and constrains the concrete therebetween; the additional short bars are arranged below the top embedded steel plate and above the bottom embedded steel plate, the additional short bars are parallel to the beam length direction, and are elongated from the constraint area of the stirrup two to the constraint area of the stirrup one.

[0020] In one embodiment, the outer wall of the steel pipe is further welded with a plurality of vertical stiff plates, the stiff plates are located between the upper connecting plate and the lower connecting ring plate and are welded with the upper connecting plate and the lower connecting ring plate at the same time, the beam end of the composite beam is located between adjacent stiff plates and has a spacing with the stiff plates to provide a welding operation space.

[0021] In one embodiment, the steel pipe is filled with concrete to form a concrete-filled steel pipe column.

[0022] The application also provides a construction method of the frame column and the composite beam connecting joint, including the following steps:

[0023] Step 1, welding of the steel pipe, the upper connecting plate and the lower connecting ring plate in the factory is completed, or welding of the steel pipe, the upper connecting plate and the lower connecting ring plate is completed;

[0024] Step 2, binding of the composite beam reinforcement cage, welding of the bottom bar and the bottom embedded steel plate, fixing of the top embedded steel plate, welding of the top bar and the top embedded steel plate are completed in the factory;

[0025] Step 3, formwork is erected and pouring of the composite beam is completed, the top embedded steel plate needs to be protected during pouring of the concrete to prevent pollution of the concrete.

[0026] Step 4, after the frame column is positioned and hoisted and fixed at the construction site, the composite beam is placed on the lower connecting ring plate, and the whole is welded after positioning; the connecting cover plate is placed, one end is welded with the top embedded steel plate, and the other end is welded with the upper connecting plate or is directly welded with the steel pipe wall.

[0027] Step 5, after the formwork is erected on site, the joint post-poured part and the composite layer are poured in sequence.

[0028] In one embodiment, the precast beam body of the composite beam is poured to the bottom surface of the top embedded steel plate within the range of the top embedded steel plate and is poured to the bottom surface elevation of the composite layer outside the range of the top embedded steel plate in step 3, the bottom surface of the top embedded steel plate is higher than the bottom surface of the composite layer, and the pouring can be realized by twice pouring.

[0029] Compared with the prior art, the present application realizes a new connection node form of the beam end by arranging the beam top pre-buried steel plate, the beam bottom pre-buried steel plate, and welding connection with the main reinforcement of the beam; and arranging the connecting cover plate, rigidly connecting the composite beam and the frame column through welding, and realizing reliable transmission of the bending moment of the node area.

[0030] The present application welds the top reinforcement of the composite beam and the beam top pre-buried steel plate into one body, and makes the beam top pre-buried steel plate and the beam body mixed into one body when pouring the composite beam, further improving the construction efficiency.

[0031] The node of the present application is simple in structure and clear in force transmission path, and solves the application pain points of the rigid connection node of the existing frame column and the composite beam. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a three-dimensional schematic view of the frame column and the composite beam connection node of the present application.

[0033] Figure 2 It is a three-dimensional schematic view of the frame column and the composite beam welding node in the example of the present application.

[0034] Figure 3 It is a three-dimensional schematic view of the composite beam end structure in the example of the present application.

[0035] Figure 4 It is a three-dimensional schematic view of the top structure of the connection node in the example of the present application.

[0036] Figure 5 It is a three-dimensional schematic view of the post-poured part in the example of the present application.

[0037] In the figure:

[0038] 1-composite beam; 11-prefabricated beam body; 12-beam top pre-buried steel plate; 13-beam bottom pre-buried steel plate; 131-steel plate side wall; 132-slot two; 14-top reinforcement; 15-bottom reinforcement; 16-stirrup one; 17-stirrup two; 18-stand reinforcement; 2-frame column; 21-steel pipe; 22-column upper connecting plate; 23-column lower connecting ring plate; 24-stiffened plate; 25-inner ring plate; 3-connecting cover plate; 31-slot one; 4-post-poured part. DETAILED DESCRIPTION

[0039] The specific technical solutions of the present application are described below in combination with the drawings and examples.

[0040] REFERENCE Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the present application is a kind of frame column and composite beam connecting node, provide the rigid node form of composite beam 1 and frame column 2, in the present application, composite beam 1 generally refers to prefabricated composite beam, including prefabricated part 11 and its reinforcing bar part, frame column 2 generally refers to steel frame column, including steel pipe 21, can further include the concrete, grouting material poured in steel pipe 21.

[0041] To realize the welding between beam and column, the present application provides two structures.

[0042] In the first structure, beam top embedded steel plate 12 and beam bottom embedded steel plate 13 are arranged at the beam end of composite beam 1, which are respectively used for connecting with frame column 2. Among them, beam top embedded steel plate 12 is located at the top of the beam end of composite beam 1, which is preferably a horizontal steel plate. Beam bottom embedded steel plate 13 is located at the bottom of the beam end of composite beam 1, which is also preferably a horizontal steel plate.

[0043] The specific arrangement of beam top embedded steel plate 12 is to be welded and connected with the top reinforcement 14 of composite beam 1 to realize stress transmission. The specific arrangement of beam bottom embedded steel plate 13 is to be welded and connected with the bottom reinforcement 15 of composite beam 1 to realize stress transmission. As known, top reinforcement 14 and bottom reinforcement 15 are known structures of composite beam 1, and their arrangement parameters can be referred to existing construction specifications.

[0044] The frame column 2 of the present application includes steel pipe 21. In order to realize the connection with beam top embedded steel plate 12 and beam bottom embedded steel plate 13, the present application welds column upper connecting plate 22 and column lower connecting ring plate 23 on the outer wall of steel pipe 21. Obviously, column upper connecting plate 22 is located above column lower connecting ring plate 23. In the prior art, if double-layer plates are arranged, the beam is often inserted between the double-layer plates, which to some extent brings difficulty to construction. In order to avoid this problem, the present application designs the radial dimension of column lower connecting ring plate 23 to be greater than the radial dimension of column upper connecting plate 22. At this time, composite beam 1 is placed on column lower connecting ring plate 23, column lower connecting ring plate 23 is in contact with beam bottom embedded steel plate 13, and reliable connection is realized by welding. The top surface of beam top embedded steel plate 12 is designed to be flush with the top surface of column upper connecting plate 22, the end portions of the two are in contact, and reliable connection is realized by welding through the upper connecting cover plate 3.

[0045] In the second structure of the present application for realizing the connection between beam and column, column upper connecting plate 22 is not required, but connecting cover plate 3 is directly welded with beam top embedded steel plate 12 and steel pipe 21 column wall respectively. Among them, the column side adopts bevel butt joint weld.

[0046] Through the above two structures and connection modes, the effective force transmission of the reinforcing bars of composite beam 1 in the node domain can be finally realized, the pipe wall of steel pipe 21 does not need to be holed or perforated, the construction steps are reduced, and the construction difficulty is reduced.

[0047] To meet the requirements of the node, obviously, after the above welding connection is completed, it is also necessary to cast the post-cast part 4 between the beam end of the composite beam 1 and the pipe wall of the steel pipe 21 to finally form a complete and reliable beam-column connection node.

[0048] It can be seen that, compared with the prior art, the present application realizes reliable force transmission of the top bar 14 and the bottom bar 15 in the node area by arranging the embedded steel plate at the end of the composite beam 1 to be welded with the frame column 2, effectively reduces the machining and construction links such as opening holes in the wall of the steel pipe column, reinforcement and beam top bar threading, simplifies the process and improves the efficiency. The force transmission path of the frame column and the composite beam connection node of the present application is clear, the structure is simple, the construction is convenient, and it has performance and construction advantages.

[0049] In further embodiments of the present application, after the connecting cover plate 3 is placed on the top embedded steel plate 12 of the beam and the top of the column connecting plate 22, it is specifically welded with the top embedded steel plate 12 of the beam and the column connecting plate 22 in the form of fillet weld, which can provide good shear and tensile strength and has high flexibility; when the column connecting plate 22 is not arranged in the structure two, the connecting cover plate 3 is still welded with the top embedded steel plate 12 of the beam in the form of fillet weld, and is welded with the steel pipe 21 column wall in the form of groove welding. Compared with the construction of the two structures and the bar threading, the difficulty is greatly reduced. At the same time, since the fillet weld has certain requirements on the size, when the size of the weld does not meet the connection strength requirement, the present application opens a slot one 31 on the surface of the connecting cover plate 3, and performs plug welding construction at the slot one 31, and connects in the form of combination of plug welding connection and fillet welding connection. The strength of the top embedded steel plate 12 of the beam and the connecting cover plate 3 is determined according to the design requirement, the cross-sectional bearing capacity of the node connection is ensured to be greater than the cross-sectional bearing capacity of each part of the beam body of the composite beam 1, and under the action of load, the beam body cross-section reaches the limit moment first, so that the plastic hinge appears in the beam body part.

[0050] Preferably, the slot one 31 is also arranged on the connecting cover plate 3 corresponding to the top embedded steel plate 12 of the beam and the column connecting plate 22.

[0051] Similarly, in further embodiments of the present application, after the composite beam 1 is placed on the column lower connecting ring plate 23, the embedded steel plate 13 on both sides of the beam is welded with the column lower connecting ring plate 23 in the form of fillet weld. For this purpose, preferably, the width of the embedded steel plate 13 of the beam is not less than the width of the beam, and the steel plate side wall 131 is exposed to realize the fillet weld welding with the column lower connecting ring plate 23. Also, when the size of the weld does not meet the connection strength requirement of the embedded steel plate 13 of the beam and the column lower connecting ring plate 23, the size of the embedded steel plate 13 of the beam along the width direction of the beam cross-section is increased, and a slot two 132 is opened in the part of the embedded steel plate 13 of the beam beyond the width of the beam, plug welding construction is performed at the slot two 132, and connection is performed in the form of combination of plug welding connection and fillet welding connection.

[0052] In further embodiments of the present application, the specific arrangement of the top embedded steel plate 12 and the bottom embedded steel plate 13 in the composite beam 1. The top reinforcement 14 of the composite beam 1 is welded to the top surface of the top embedded steel plate 12, and the length of the top reinforcement 14 is less than the length of the beam, i.e. a blank surface is left on the top surface of the top embedded steel plate 12 in the direction of the frame column 2, which is used as the part to be welded to the connecting cover plate 3. The bottom reinforcement 15 is welded to the top surface of the bottom embedded steel plate 13, and thus the length of the bottom reinforcement 15 is not limited, e.g. can be equal to the length of the beam.

[0053] In the conventional composite beam structure, the stirrups are often arranged uniformly. Due to the special design of the beam end structure of the present application, the stirrups are also adjusted accordingly. Specifically, in the precast beam body 11 of the composite beam 1, the stirrup one 16 and the stirrup two 17 are designed. The stirrup one 16 is located outside the range of the top embedded steel plate 12 and the bottom embedded steel plate 13, and the constraint region includes the top reinforcement 14, the bottom reinforcement 15 and the core concrete therebetween. The stirrup two 17 is located within the range of the top embedded steel plate 12 and the bottom embedded steel plate 13, specifically between the top embedded steel plate 12 and the bottom embedded steel plate 13, and constrains the concrete therebetween. At the same time, due to the insufficient length of the reinforcement arrangement at the beam end, the present application additionally arranges the short reinforcement 18 below the top embedded steel plate 12 and above the bottom embedded steel plate 13. The short reinforcement 18 is parallel to the length direction of the beam and is located within the constraint region of the stirrup two 17, and a part of the short reinforcement 18 can also extend into the constraint region of the stirrup one 16.

[0054] In further embodiments of the present application, in order to further improve the strength of the node structure, a plurality of vertical stiffeners 24 are welded to the outer wall of the steel pipe 21, each stiffener 24 is located between the upper connecting plate 22 and the lower connecting ring plate 23 of the column, the side wall is welded to the outer wall of the steel pipe 21, the top edge is welded to the upper connecting plate 22 of the column, and the bottom edge is welded to the lower connecting ring plate 23 of the column. A space is formed between adjacent stiffeners 24, which is sufficient to accommodate the beam end of the composite beam 1, and still has a welding operation space after being accommodated.

[0055] In further embodiments of the present application, the steel pipe 21 can be filled with concrete to form a concrete-filled steel pipe column. That is, the frame column 2 of the present application can be a steel structure or a steel-concrete structure.

[0056] In further embodiments of the present application, the material of the post-cast part 4 can be concrete, ultra-high performance concrete or high-strength grouting material, which is poured into the space enclosed by the steel pipe 21, the stiffener 24, the beam body 11 and the lower connecting ring plate 23 of the column, and is formed on site.

[0057] In further embodiments of the present application, when the structure two is not provided with the column connecting plate 22, the connecting cover plate 3 is directly connected with the column wall of the steel pipe 21 by means of the groove welding, and in order to further strengthen the structural strength, the inner ring plate 25 should be arranged on the inner wall of the steel pipe 21, the inner ring plate 25 is at the same height with the connecting cover plate 3, and the two are corresponding inside and outside the steel pipe 21, so as to ensure the reliable force transmission of the node core area.

[0058] The construction method of the frame column and the composite beam connecting node of the present application mainly comprises the following steps:

[0059] Step 1, the welding of the steel pipe 21, the column connecting plate 22 (if any) and the column connecting ring plate 23 in the frame column 2 is completed in the factory;

[0060] Step 2, the binding of the steel reinforcement cage of the composite beam 1, the welding of the bottom reinforcement 15 and the beam bottom embedded steel plate 13, the fixing of the beam top embedded steel plate 12, the welding of the top reinforcement 14 and the beam top embedded steel plate 12 are completed in the factory;

[0061] Step 3, the formwork is supported and the pouring of the composite beam 1 is completed, and in the process of pouring the concrete, the top embedded steel plate needs to be protected to prevent the concrete from being contaminated.

[0062] Further, in this step, the precast beam body 11 of the composite beam 1 is poured to the bottom surface of the beam top embedded steel plate 12 within the range of the beam top embedded steel plate 12, and is poured to the bottom surface elevation of the composite layer 41 outside the range of the beam top embedded steel plate 12, the bottom surface of the beam top embedded steel plate 12 is higher than the bottom surface of the composite layer 41, and the two pouring can be realized, so as to form a stepped structure at the beam end.

[0063] Step 4, after the frame column 2 is positioned and hoisted and fixed at the construction site, the composite beam 1 is placed on the column connecting ring plate 23, and the welding is formed after positioning to form an integral whole; the connecting cover plate 3 is placed, when the structure one is adopted, one end is welded with the beam top embedded steel plate 12, and the other end is welded with the column connecting plate 22, and when the structure two is adopted, it is directly welded with the column wall of the steel pipe 21. Further, in this step, when the composite beam 1 falls, the range of the column connecting plate 22 needs to be avoided, and the length of the welding seam between the column connecting ring plate 23 and the beam bottom embedded steel plate 13 needs to be ensured, when the size of the column connecting ring plate 23 is large, the stiffener 24 and the stiffening rib and other measures should be additionally arranged at the column connecting ring plate 23.

[0064] Step 5, after the formwork is supported at the site, the node post-poured part 4 and the composite layer 41 are poured in sequence.

[0065] Further, in this step, before the formwork is supported, the gap between the adjacent precast beam bodies 11 and the column connecting ring plate 23 is sealed by using the joint sealant or the cover plate, so as to prevent the slurry leakage.

[0066] The application solves the problem of difficult top bar penetration in site construction, and the top bar is pre-buried in the factory prefabrication stage and integrally poured with the beam at the end to form partial full prefabrication; the remaining part adopts a composite beam to form an integral structure with the prefabricated floor.

Claims

1. A frame column and composite beam connecting joint, characterized in that: a beam top embedded steel plate (12) is arranged at the top of the beam end of a composite beam (1), and a beam bottom embedded steel plate (13) is arranged at the bottom of the beam end, the top reinforcement (14) of the composite beam (1) is welded to the beam top embedded steel plate (12), and the bottom reinforcement (15) is welded to the beam bottom embedded steel plate (13), so as to realize stress transmission; a column lower connecting ring plate (23) is welded to the outer wall of a steel pipe (21) of a frame column (2); the composite beam (1) is placed on the column lower connecting ring plate (23), the beam bottom embedded steel plate (13) is welded to the column lower connecting ring plate (23), and the beam top embedded steel plate (12) is welded to the outer wall of the steel pipe (21) through a connecting cover plate (3) or through the connecting cover plate (3) and a column upper connecting plate (22), so as to realize effective force transmission of the reinforcement of the composite beam (1) in the joint domain and avoid opening holes in the pipe wall of the steel pipe (21); a post-poured part (4) is formed by pouring between the beam end of the composite beam (1) and the pipe wall of the steel pipe (21); the precast beam body (11) of the composite beam (1) is provided with a stirrup one (16) outside the range of the beam top embedded steel plate (12) and the beam bottom embedded steel plate (13) and a stirrup two (17) within the range; the constraint area of the stirrup one (16) includes the top reinforcement (14), the bottom reinforcement (15) and the core concrete therebetween, the stirrup two (17) is located between the beam top embedded steel plate (12) and the beam bottom embedded steel plate (13) and constrains the concrete therebetween; additional short reinforcement (18) is arranged below the beam top embedded steel plate (12) and above the beam bottom embedded steel plate (13), the additional short reinforcement (18) is parallel to the beam length direction and extends from the constraint area of the stirrup two (17) to the constraint area of the stirrup one (16). The beam top embedded steel plate (12) is welded to the outer wall of the steel pipe (21) through the connecting cover plate (3), and the following is realized: one end of the connecting cover plate (3) is welded to the top of the beam top embedded steel plate (12), the other end is directly welded to the outer wall of the steel pipe (21) through bevel butt welding, and an inner ring plate (25) is arranged on the inner wall of the steel pipe (21) corresponding to the connecting position of the connecting cover plate (3), so as to ensure reliable force transmission of the joint core area. The beam top embedded steel plate (12) is welded to the outer wall of the steel pipe (21) through the connecting cover plate (3) and the column upper connecting plate (22), and the following is realized: a column upper connecting plate (22) is welded to the outer wall of the steel pipe (21) of the frame column (2), the radial dimension of the column lower connecting ring plate (23) is greater than the radial dimension of the column upper connecting plate (22); The connecting cover plate (3) is placed on the top of the beam top embedded steel plate (12) and the column upper connecting plate (22) and is welded to the beam top embedded steel plate (12) and the column upper connecting plate (22) through fillet welding, when the size of the weld does not meet the connection strength requirement, a slot one (31) is formed on the surface of the cover plate (3), and the connection is realized in the form of combination of plug welding connection and fillet welding connection. ​ ​ 2. The frame column-to-composite beam connection of claim 1, wherein, ​ ​ 3. The frame column-to-composite beam connection of claim 1, wherein, ​ ​ ​ 4. The frame column and composite beam connection of claim 3, wherein, According to the design requirements, the strength of the embedded steel plate (12) at the top of the beam and the connecting cover plate (3) is determined to ensure that the bearing capacity of each section in the joint connecting area is greater than the bearing capacity of each part of the composite beam (1) to make the plastic hinge of the beam end occur in the area outside the range of the embedded steel plate (12) at the top of the beam.

5. The frame column-to-composite beam connection of claim 3, wherein, The outer wall of the steel pipe (21) is also welded with a plurality of vertical stiffeners (24), the stiffeners (24) are located between the upper column connecting plate (22) and the lower column connecting ring plate (23) and are welded with the upper column connecting plate (22) and the lower column connecting ring plate (23), the beam end of the composite beam (1) is located between adjacent stiffeners (24) and has a spacing with the stiffeners (24) to provide a welding operation space.

6. The frame column-to-composite beam connection of any one of claims 1 to 5, wherein, The embedded steel plate (13) at the bottom of the beam is connected with the lower column connecting ring plate (23) through the fillet weld on both sides, when the size of the weld does not meet the strength requirement of the connection, the size of the embedded steel plate (13) at the bottom of the beam in the width direction of the beam section is increased, and a second notch (132) is formed in the part of the embedded steel plate (13) at the bottom of the beam which exceeds the beam width area, and the connection is achieved by combining plug welding with fillet welding.

7. The frame column-to-composite beam connection of claim 1, wherein, The top reinforcement (14) is welded to the top surface of the embedded steel plate (12) at the top of the beam, and a part welded with the connecting cover plate (3) is left on the top surface of the embedded steel plate (12) at the top of the beam in the direction close to the frame column (2); the bottom reinforcement (15) is welded to the top surface of the embedded steel plate (13) at the bottom of the beam.

8. The construction method of the frame column and the composite beam connecting joint according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: Step 1, welding the steel pipe (21) and the lower column connecting ring plate (23) in the frame column (2) or welding the steel pipe (21), the upper column connecting plate (22) and the lower column connecting ring plate (23) in the factory; Step 2, binding the reinforcement cage of the composite beam (1), welding the bottom reinforcement (15) and the embedded steel plate (13) at the bottom of the beam, fixing the embedded steel plate (12) at the top of the beam, welding the top reinforcement (14) and the embedded steel plate (12) at the top of the beam in the factory; Step 3, supporting the mold and pouring the composite beam (1); Step 4, after the frame column (2) is positioned and hoisted and fixed at the construction site, the composite beam (1) is placed on the lower column connecting ring plate (23), and the whole is welded after positioning; the connecting cover plate (3) is placed, one end of which is welded with the embedded steel plate (12) at the top of the beam, and the other end is welded with the upper column connecting plate (22) or directly welded with the steel pipe (21) column wall; Step 5, after the mold is supported on site, the node post-poured part (4) and the composite layer (41) are poured in turn.

9. The construction method of the frame column and the composite beam connecting joint according to claim 8, characterized in that, In the step 3, the precast beam body (11) of the composite beam (1) is poured to the bottom surface of the embedded steel plate (12) at the top of the beam within the range of the embedded steel plate (12) at the top of the beam, and is poured to the bottom surface elevation of the composite layer (41) outside the range of the embedded steel plate (12) at the top of the beam, the bottom surface of the embedded steel plate (12) at the top of the beam is higher than the bottom surface of the composite layer (41).

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