A steel pipe confined reinforced concrete ring beam joint

Abstract

The application discloses a kind of steel pipe confined reinforced concrete ring beam joints, including steel pipe confined reinforced concrete column upper column, steel pipe confined reinforced concrete column lower column, reinforced concrete first frame beam, reinforced concrete second frame beam and built-in steel pipe ring beam joint. Steel pipe confined reinforced concrete column built-in reinforcement cage, outer package steel pipe is disconnected at beam-column joint;Independent steel pipe welded with stud is arranged in the joint ring beam, it is the main force component, thickening can realize the effective reinforcement of joint area, and can replace the stirrup in traditional reinforced concrete beam-column joint, solve the construction technical problem of existing joint area;The main function of ring beam is to make the steel pipe of joint area and beam column form a whole, without too much participation in stress, so the outer convex size of the node ring beam is smaller, and the building visual effect is better. This kind of joint improves the technical problem that traditional steel pipe concrete column and reinforced concrete beam are connected complex, has the characteristics of good integrity, flexible design, convenient construction etc.

Description

Technical Field

[0001] This invention relates to a construction technology for steel-concrete composite structures, belonging to the field of building structure technology, specifically to a steel pipe-confined reinforced concrete ring beam joint. Background Technology

[0002] A steel-tube confined reinforced concrete column is a steel-concrete composite member in which an additional steel tube is installed on the outside of a reinforced concrete column, and the outer steel tube is discontinuous near the beam-column joint of the frame. The steel tube does not directly participate in the load-bearing and mainly serves to restrain the reinforced concrete it surrounds. Steel-tube confined concrete columns inherit the characteristics of high load-bearing capacity and excellent seismic performance of steel-tube concrete columns. At the same time, because the steel tube is discontinuous at the beam-column joint, the connection between the steel-tube confined concrete column and the reinforced concrete beam is relatively convenient, making design and construction more flexible and showing good application prospects.

[0003] Due to their simple and economical construction, good overall stiffness, waterproofing, and seismic performance, cast-in-place reinforced concrete beam-slab systems still dominate in my country. Therefore, establishing a composite structural system adapted to this system has always been a research hotspot in composite structures. Steel-concrete composite columns and steel-concrete composite columns combine high load-bearing capacity, excellent seismic performance, and moderate cost, making them the two most commonly used vertical load-bearing member forms in composite structures. However, because the outer side of a steel-concrete composite column is a continuous steel pipe, there are some technical challenges in connecting it to a reinforced concrete beam: when using a through-beam joint, the ring beam reinforcement is densely distributed, resulting in a complex structure and high construction difficulty, especially when there are multiple rows of longitudinal reinforcement within the beam; when using an outer ring plate joint, the steel consumption is large, the economic effect is not ideal, and the longitudinal reinforcement within the beam needs to be welded to the ring plate on-site to ensure anchorage performance, leading to higher construction costs; both connection methods result in a protruding ring beam at the joint, affecting the building's aesthetics. For steel-concrete composite columns, when connected to reinforced concrete beams, the web of the steel section needs to be partially opened to ensure that the longitudinal reinforcement of the beam passes through the joint area. When there are reinforced concrete beams in three or four directions of the joint, mechanical connection sleeves need to be welded on the flanges or steel brackets need to be installed to ensure a reliable connection with the longitudinal reinforcement of the beam. The structure is complex and the construction is difficult. Summary of the Invention

[0004] The purpose of this invention is to provide a steel pipe-constrained reinforced concrete ring beam joint, which aims to solve the technical problem of complex connection between traditional composite columns and reinforced concrete beams. That is, while ensuring that the joint area has sufficient strength, stiffness and ductility, the size of traditional ring beam joints is reduced, the complexity of design and construction is reduced and the overall integrity of the structure is improved.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A steel-tube confined reinforced concrete ring beam joint includes a steel-tube confined reinforced concrete column above a column, a steel-tube confined reinforced concrete column below a column, an internal steel-tube ring beam joint, a reinforced concrete first frame beam, and a reinforced concrete second frame beam;

[0007] The upper and lower columns of the steel-tube confined reinforced concrete column are located on the upper and lower sides of the built-in steel tube ring beam node, respectively.

[0008] Two sets of reinforced concrete first frame beams and reinforced concrete second frame beams are arranged circumferentially on the outer side of the built-in steel pipe ring beam node, and the reinforced concrete first frame beams and reinforced concrete second frame beams are arranged perpendicularly to each other.

[0009] The built-in steel pipe ring beam node includes ring beam concrete, ring beam stirrups, built-in steel pipes, studs, structural stirrups, and support bars; the built-in steel pipes are erected inside the structural stirrups, the studs are fixedly connected to the outside of the built-in steel pipes, the support bars are bound to the structural stirrups to form a whole, the ring beam concrete is poured outside the structural stirrups, and the ring beam stirrups are set on the upper side of the ring beam concrete.

[0010] Furthermore, the upper column of the steel-tube confined reinforced concrete column includes an upper column steel tube, upper column concrete, column longitudinal reinforcement, and upper column stirrups. The column longitudinal reinforcement and upper column stirrups form the upper column reinforcement cage. The upper column concrete is poured inside the upper column steel tube. The upper column steel tube and the upper column reinforcement cage together form the upper column of the steel-tube confined reinforced concrete column. The lower column of the steel-tube confined reinforced concrete column includes a lower column steel tube, lower column concrete, column longitudinal reinforcement, and lower column stirrups. The lower column stirrups and column longitudinal reinforcement form the lower column reinforcement cage. The lower column concrete is poured inside the lower column steel tube. The lower column steel tube and the lower column reinforcement cage together form the lower column. The upper column reinforcement cage and the lower column reinforcement cage together form an integral, continuous node area without interruption.

[0011] Furthermore, the inner diameter of the built-in steel pipe is equal to the inner diameter of the column stirrups.

[0012] Furthermore, the thickness of the built-in steel pipe shall not be less than that of the column steel pipe; when the height difference between the sections of the reinforced concrete first frame beam and the reinforced concrete second frame beam is less than 1 / 4 of the section height of the reinforced concrete first frame beam and less than 200mm, the number of built-in steel pipes shall be one, and its height shall not be greater than the distance from the bottom row of upper longitudinal reinforcement to the top row of lower longitudinal reinforcement of the reinforced concrete second frame beam.

[0013] Furthermore, the thickness of the built-in steel pipe is not less than the thickness of the column steel pipe. When the height difference between the reinforced concrete first frame beam and the reinforced concrete second frame beam is greater than 1 / 4 of the height of the reinforced concrete first frame beam or greater than 200mm, the number of built-in steel pipes is two.

[0014] Furthermore, when there is one built-in steel pipe, the studs are arranged in no less than two rows in the vertical direction; when there are two built-in steel pipes, the studs on each built-in steel pipe are arranged in at least one row in the vertical direction.

[0015] Furthermore, structural stirrups are embedded in the concrete of the ring beam. The shape of the structural stirrups is circular or square, and the number of layers of structural stirrups in the concrete of the ring beam is not less than two.

[0016] Furthermore, the structural stirrups and the stirrups are bound together as a whole, the diameter of the stirrups is not less than the diameter of the structural stirrups, and the number of stirrups is not less than four.

[0017] Furthermore, the built-in steel pipe ring beam node is a cylindrical or cubic structure.

[0018] Furthermore, the upper column steel pipe, the inner steel pipe, and the lower column steel pipe can be made by welding steel plates or seamless steel pipes.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] This invention discloses a steel-tube-confined reinforced concrete ring beam node, comprising a steel-tube-confined reinforced concrete column top, a steel-tube-confined reinforced concrete column bottom, an internal steel-tube ring beam node, a reinforced concrete first frame beam, and a reinforced concrete second frame beam. The steel-tube-confined reinforced concrete column top and bottom are located on the upper and lower sides of the internal steel-tube ring beam node, respectively. Two sets of reinforced concrete first and second frame beams are arranged circumferentially on the outer side of the internal steel-tube ring beam node, perpendicularly arranged between each other. The internal steel-tube ring beam node includes ring beam concrete, ring beam stirrups, an internal steel tube, studs, structural stirrups, and support bars. The internal steel tube is erected within the structural stirrups, studs are fixedly connected to the outside of the internal steel tube, and the support bars are bound to the structural stirrups as a whole. The ring beam concrete is poured outside the structural stirrups, and the ring beam stirrups are located on the upper side of the ring beam concrete. The steel pipes built into the ring beam joint can replace the stirrups in the traditional reinforced concrete beam-column joint, avoiding the technical difficulties in construction when the stirrups are dense in the joint in high-intensity fortification areas. It has the characteristics of good integrity, flexible design, good applicability and convenient construction. The steel pipe confines the reinforced concrete ring beam joint, and the main load-bearing component is the steel pipe built into the joint area. The main function of the ring beam is to make the steel pipe built into the joint area and the beam and column form an integral whole. It does not need to participate too much in the load-bearing. Therefore, the outward convex dimension of the ring beam is small and the overall building appearance is better. Since the beam reinforcement passes through the joint area, the integrity of the joint is good and meets the structural stress requirements.

[0021] Furthermore, the upper column of the steel-tube confined reinforced concrete column includes an upper column steel tube, upper column concrete, column longitudinal reinforcement, and upper column stirrups. The column longitudinal reinforcement and upper column stirrups form the upper column reinforcement cage. The upper column concrete is poured inside the upper column steel tube. The upper column steel tube and the upper column reinforcement cage together form the upper column of the steel-tube confined reinforced concrete column. The lower column of the steel-tube confined reinforced concrete column includes a lower column steel tube, lower column concrete, column longitudinal reinforcement, and lower column stirrups. The lower column stirrups and ring beam stirrups together form the lower column reinforcement cage. The lower column concrete is poured inside the lower column steel tube. The lower column steel tube and the lower column reinforcement cage together form the lower column. The entire joint area formed by the upper column reinforcement cage and the lower column reinforcement cage is continuous and uninterrupted. The integrity of the joint is good and meets the structural stress requirements.

[0022] Furthermore, the inner diameter of the built-in steel pipe is equal to the inner diameter of the column stirrups, so as to replace the stirrups in the joint area;

[0023] Furthermore, the thickness of the built-in steel pipe is not less than that of the column steel pipe; when the height difference between the sections of the reinforced concrete first frame beam and the reinforced concrete second frame beam is less than 1 / 4 of the section height of the reinforced concrete first frame beam and less than 200mm, the number of built-in steel pipes is one, and its height is not greater than the distance from the bottom row of the upper longitudinal reinforcement to the top row of the lower longitudinal reinforcement of the reinforced concrete second frame beam, so as to facilitate the passage of the longitudinal reinforcement of the reinforced concrete frame beam.

[0024] Furthermore, the thickness of the built-in steel pipe is not less than the thickness of the column steel pipe; when the height difference between the reinforced concrete first frame beam and the reinforced concrete second frame beam is greater than 1 / 4 of the height of the reinforced concrete first frame beam or greater than 200mm, the number of built-in steel pipes is two, and the steel pipes in the ring beam are independent segments. The steel pipes can be thickened to effectively strengthen the joint area. Adjusting the height of the steel pipes can ensure that the longitudinal reinforcement of the beam passes directly through the joint area. It is applicable to various complex working conditions when the dimensions of the transverse and longitudinal frame beams are different. The design is flexible and can further reduce the construction difficulty.

[0025] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of a single built-in steel pipe circular ring beam node in an embodiment of the present invention;

[0027] Figure 2 This is a three-dimensional perspective view of a single built-in steel pipe circular ring beam node in an embodiment of the present invention;

[0028] Figure 3 This is a detailed structural diagram of a single built-in steel pipe circular ring beam node in an embodiment of the present invention;

[0029] Figure 4This is a plan view of the single-embedded steel pipe circular ring beam node in an embodiment of the present invention;

[0030] Figure 5 This is a three-dimensional schematic diagram of a single built-in steel pipe square ring beam node in an embodiment of the present invention;

[0031] Figure 6 This is a three-dimensional perspective view of a single built-in steel pipe square ring beam node in an embodiment of the present invention;

[0032] Figure 7 This is a detailed structural diagram of a single-embedded steel pipe square ring beam node in an embodiment of the present invention;

[0033] Figure 8 This is a plan view of the single-embedded steel pipe square ring beam node in an embodiment of the present invention;

[0034] Figure 9 This is a three-dimensional schematic diagram of the double-embedded steel pipe circular ring beam node in an embodiment of the present invention;

[0035] Figure 10 This is a three-dimensional perspective view of the double-embedded steel pipe circular ring beam node in an embodiment of the present invention;

[0036] Figure 11 This is a detailed structural diagram of the double-embedded steel pipe circular ring beam node in an embodiment of the present invention;

[0037] Figure 12 This is a plan view of the double-embedded steel pipe circular ring beam node in an embodiment of the present invention.

[0038] In the diagram, the following are listed: 1. Upper column steel pipe; 2. Upper column concrete; 3. Column longitudinal reinforcement; 4. Upper column stirrups; 5. Upper column of steel pipe confined reinforced concrete column; 6. Reinforced concrete first frame beam; 7. Reinforced concrete first frame beam longitudinal reinforcement; 8. Reinforced concrete first frame beam stirrups; 9. Reinforced concrete second frame beam; 10. Reinforced concrete second frame beam longitudinal reinforcement; 11. Reinforced concrete second frame beam stirrups; 12. Reinforced concrete second frame beam; 13. Lower column steel pipe; 14. Lower column concrete; 15. Lower column stirrups; 16. Lower column of steel pipe confined reinforced concrete column; 17. Ring beam concrete; 18. Ring beam stirrups; 19. Internal steel pipe; 20. Stud; 21. Structural stirrups; 22. Stirrup reinforcement; 23. Internal steel pipe ring beam node; 24. Detailed Implementation

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0040] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0041] As attached Figure 1-4 As shown, the present invention provides a steel pipe confined reinforced concrete ring beam joint, including a steel pipe confined reinforced concrete column 5, a steel pipe confined reinforced concrete column 17, an internal steel pipe ring beam joint 24, a reinforced concrete first frame beam 9, and a reinforced concrete second frame beam 13.

[0042] Among them, the upper column 5 and the lower column 17 of the steel pipe confined reinforced concrete column are located on the upper and lower sides of the built-in steel pipe ring beam node 24, respectively.

[0043] Two sets of reinforced concrete first frame beams 9 and reinforced concrete second frame beams 13 are provided on the outer circumference of the built-in steel pipe ring beam node 24. The reinforced concrete first frame beam 9 and reinforced concrete second frame beam 13 are perpendicular to each other in the axis, and the included angle between the top surface of the reinforced concrete first frame beam 9 and the top surface of the reinforced concrete second frame beam 13 is 90°.

[0044] The built-in steel pipe ring beam node includes a ring beam concrete 18, ring beam stirrups 19, built-in steel pipes 20, studs 21, structural stirrups 22, and support bars 23; the built-in steel pipes 20 are erected inside the structural stirrups 22, the studs 21 are fixedly connected to the outside of the built-in steel pipes 20, the support bars 23 are bound to the structural stirrups 23 to form a whole, the ring beam concrete is poured outside the structural stirrups 22, and the ring beam stirrups 19 are set on the upper side of the ring beam concrete 18.

[0045] Specifically, the upper column 5 of the steel-tube confined reinforced concrete column includes an upper column steel pipe 1, upper column concrete 2, column longitudinal reinforcement 3, and upper column stirrups 4. The column longitudinal reinforcement 3 and the upper column stirrups 4 form the upper column reinforcement cage. The upper column concrete 2 is poured inside the upper column steel pipe 1. The upper column steel pipe 1 and the upper column reinforcement cage together form the upper column 5 of the steel-tube confined reinforced concrete column. The lower column 17 of the steel-tube confined reinforced concrete column includes a lower column steel pipe 14, lower column concrete 15, column longitudinal reinforcement 3, and lower column stirrups 16. The lower column stirrups 16 and the ring beam stirrups 19 together form the lower column reinforcement cage. The lower column concrete 15 is poured inside the lower column steel pipe 14. The lower column steel pipe 14 and the lower column reinforcement cage together form the lower column 17. The column longitudinal reinforcement 3 passes through the built-in steel pipe ring beam node. The upper column reinforcement cage and the lower column reinforcement cage together form an integral, uninterrupted, continuous node area. The upper column 5 and the lower column 17 of the steel-tube confined reinforced concrete column are located on the upper and lower sides of the ring beam concrete 18, respectively.

[0046] Both the upper column steel pipe 1 and the lower column steel pipe 14 are hollow cylinders with open ends. Both the upper column steel pipe 1 and the lower column steel pipe 14 are arranged perpendicular to the foundation plane. The outer diameter of the upper column steel pipe 1 and the lower column steel pipe 14 should not be less than 300mm and the thickness should not be less than 3mm. The diameter, quantity and distribution of the column longitudinal reinforcement 3 are determined according to the design requirements. The diameter, quantity and distance of the upper column stirrups 4 and the lower column stirrups 16 are determined according to the design requirements.

[0047] The reinforced concrete first frame beam 9 includes reinforced concrete first frame beam concrete 6, reinforced concrete first frame beam longitudinal reinforcement 7, and reinforced concrete first frame beam stirrups 8; the reinforced concrete second frame beam 13 includes reinforced concrete second frame beam concrete 10, reinforced concrete second frame beam longitudinal reinforcement 11, and reinforced concrete second frame beam stirrups 12. The top surface of reinforced concrete first frame beam concrete 6 and reinforced concrete second frame beam concrete 10 are flush with the top surface of ring beam concrete 18; the diameter and number of longitudinal reinforcement 7 and longitudinal reinforcement 11 of reinforced concrete first frame beam are the same. The quantity and distribution are determined according to design requirements. The diameter, quantity, and spacing of the stirrups 8 and 12 of the reinforced concrete first frame beam are determined according to design requirements. Both the reinforced concrete first frame beam 9 and the reinforced concrete second frame beam 13 pass through the built-in steel pipe ring beam node 24. The longitudinal reinforcement 7 and the stirrups 8 of the reinforced concrete first frame beam form the reinforcement cage of the reinforced concrete first frame beam. The concrete 6 of the reinforced concrete first frame beam is poured outside the reinforcement cage of the reinforced concrete first frame beam to form the reinforced concrete first frame beam 9; the longitudinal reinforcement 11 and the steel... The stirrups 12 of the reinforced concrete second frame beam form the reinforcement cage of the reinforced concrete second frame beam. Concrete 10 of the reinforced concrete second frame beam is poured outside the reinforcement cage to form the reinforced concrete second frame beam 13. The bottom row of upper longitudinal reinforcement of the reinforced concrete first frame beam 9 is placed on the top row of upper longitudinal reinforcement of the reinforced concrete second frame beam 13. When there is only one internal steel pipe 20, the bottom row of upper longitudinal reinforcement of the reinforced concrete second frame beam 13 is placed on the internal steel pipe 20, and the top row of lower longitudinal reinforcement of the reinforced concrete second frame beam 13 is placed below the internal steel pipe 20. The bottom row of longitudinal reinforcement bars is placed on the top row of lower longitudinal reinforcement bars of the first reinforced concrete frame beam 9; when there are two built-in steel pipes 20, the bottom row of upper longitudinal reinforcement bars of the second reinforced concrete frame beam 13 is placed on the upper built-in steel pipe 20, the top row of lower longitudinal reinforcement bars of the second reinforced concrete frame beam 13 is placed below the upper built-in steel pipe 20, and the bottom row of lower longitudinal reinforcement bars of the second reinforced concrete frame beam 13 is placed on the lower built-in steel pipe 20. That is, all the lower longitudinal reinforcement bars of the second reinforced concrete frame beam 13 pass through the gap between the upper and lower built-in steel pipes 20, and the top row of lower longitudinal reinforcement bars of the first reinforced concrete frame beam 9 is placed below the lower built-in steel pipe 20.

[0048] The built-in steel pipe 20 is a hollow cylinder with open top and bottom ends. The built-in steel pipe 20 is embedded in the ring beam concrete 18. The built-in steel pipe 20 is arranged perpendicular to the foundation plane. The inner diameter of the built-in steel pipe 20 is equal to the inner diameter of the column stirrups, so as to replace the stirrups in the node area.

[0049] The thickness of the built-in steel pipe 20 shall not be less than the thickness of the column steel pipe; when the height difference between the sections of the reinforced concrete first frame beam 9 and the reinforced concrete second frame beam 13 is less than 1 / 4 of the section height of the reinforced concrete first frame beam 9 and less than 200mm, the number of built-in steel pipes 20 shall be one, as shown in the attached figure. Figure 1-8 As shown, the height of the built-in steel pipe 20 shall not exceed the distance from the bottom upper longitudinal reinforcement of the second reinforced concrete frame beam 13 to the top lower longitudinal reinforcement of the second reinforced concrete frame beam 13; when the height difference between the first reinforced concrete frame beam 9 and the second reinforced concrete frame beam 13 is greater than 1 / 4 of the height of the first reinforced concrete frame beam 9 or greater than 200mm, the number of built-in steel pipes 20 shall be two, as shown in the attached figure. Figure 9-12 As shown, the height of the upper steel pipe is not greater than the distance from the bottom row of upper longitudinal bars to the top row of lower longitudinal bars of the second reinforced concrete frame beam 13, and the height of the lower steel pipe is not greater than the distance from the bottom row of lower longitudinal bars to the top row of lower longitudinal bars of the first reinforced concrete frame beam 9. The distance between the upper and lower steel pipes is not less than the distance between the bottom row of lower longitudinal bars and the bottom row of lower longitudinal bars of the second reinforced concrete frame beam 13, so as to facilitate the passage of the lower longitudinal bars of the second reinforced concrete frame beam 13.

[0050] The studs 21 are cylindrical head studs for electric arc stud welding, welded to the outside of the inner steel pipe 20, with a nominal diameter of not less than 10 mm, and evenly arranged along the circumference; when there is one inner steel pipe 20, the studs 21 are arranged in no less than two rows vertically; when there are two inner steel pipes 20, the studs 21 welded on each inner steel pipe 20 are arranged in at least one row vertically.

[0051] The structural stirrups 22 are embedded in the ring beam concrete 18. The structural stirrups 22 are circular or square in shape, arranged vertically in no less than two rows, with a diameter of no less than 8 mm and a spacing of no more than 200 mm. The stirrups 23 have a diameter of no less than that of the structural stirrups 22, and there are no less than four of them. The stirrups 23 are bound to the structural stirrups 22 to form a whole. The whole formed by the stirrups 23 and the structural stirrups 22 is embedded in the ring beam concrete 18.

[0052] like Figures 1 to 4 As shown, in this embodiment, the built-in steel pipe ring beam node 24 is a cylindrical structure;

[0053] like Figure 5-8 As shown, in one embodiment of the present invention, the built-in steel pipe ring beam node 24 is a cubic structure;

[0054] As attached Figure 9-12In one embodiment of the present invention, the heights of the reinforced concrete first frame beam 9 and the reinforced concrete second frame beam 13 are different, and the height difference between the two satisfies the condition for setting two built-in steel pipes, so two built-in steel pipes are set.

[0055] In this invention, the upper column steel pipe 1, the inner steel pipe 20, and the lower column steel pipe 14 can be made of welded steel plates or seamless steel pipes. The materials of the upper column steel pipe 1, the inner steel pipe 20, and the lower column steel pipe 14 should preferably be Q355, Q390, Q420, or Q460 grade steel. The column longitudinal reinforcement 3, the reinforced concrete first frame beam longitudinal reinforcement 7, and the reinforced concrete second frame beam longitudinal reinforcement 11 are all made of hot-rolled ribbed steel bars, and the strength grade can be HRB400, HRB500, or HRBF400. The upper column stirrups 4, the reinforced concrete first frame beam stirrups 8, the reinforced concrete second frame beam stirrups 12, the lower column stirrups 16, the ring beam stirrups 19, the structural stirrups 22, and the stirrup reinforcement 23 are all made of hot-rolled ribbed steel bars, and the strength grade can be HRB335, HRB400, or HRBF400.

[0056] Specifically, the shape of the ring beam concrete 18 is a cylinder or a cube. The ring beam concrete (18) starts from the bottom of the upper column and ends at the top of the lower column. The height of the ring beam concrete (18) is not less than the height of the transverse frame beam. The diameter or side length of the ring beam concrete (18) is not less than (outer diameter of the built-in steel pipe 20 + 2 × length of the stud 21 + 2 × minimum protective layer thickness required for the stud 21).

[0057] Specifically, upper column concrete 2 is poured into upper column steel pipe 1, lower column concrete 15 is poured into lower column steel pipe 14, reinforced concrete first frame beam concrete 6 is poured into reinforced concrete first frame beam reinforcement cage, longitudinal frame beam concrete 8 is poured into reinforced concrete second frame beam reinforcement cage, and ring beam concrete 18 is poured into ring beam reinforcement cage. The top of reinforced concrete first frame beam concrete 6 and reinforced concrete second frame beam concrete 10 are flush with the top of ring beam concrete 18. After curing, a steel pipe confined reinforced concrete frame with built-in steel pipe is formed.

[0058] The strength of the upper column concrete 2, lower column concrete 15, and ring beam concrete 18 shall not be lower than C30 and micro-expansion concrete should be used; the strength of the reinforced concrete first frame beam concrete 6 and the reinforced concrete second frame beam concrete 10 shall not be lower than C25.

[0059] The basic on-site fabrication scheme for the steel pipe-confined reinforced concrete frame beam-column joint of the present invention is as follows:

[0060] (1) Prefabricate the upper column steel pipe 1, lower column steel pipe 14 and internal steel pipe 20; purchase studs 21 and weld them to the internal steel pipe 20; process and bend the reinforcing bars; after completion, place all materials on a leveled site for later use.

[0061] (2) Tie the column longitudinal reinforcement 3 and the lower column stirrup 16; hoist and fix the lower column steel pipe 14;

[0062] (3) Use the column reinforcement cage to fix the built-in steel pipe 20 with welded studs to the design position, and install the ring beam stirrups 19, structural stirrups 22 and support bars 23;

[0063] (4) Pass the longitudinal reinforcement 7 of the first reinforced concrete frame beam and the longitudinal reinforcement 11 of the second reinforced concrete frame beam through the gap between the top and bottom of the built-in steel pipe 20, install the stirrup 8 of the first reinforced concrete frame beam to the longitudinal reinforcement 7 of the first reinforced concrete frame beam, and install the stirrup 12 of the second reinforced concrete frame beam to the longitudinal reinforcement 11 of the second reinforced concrete frame beam to form a steel cage for the first reinforced concrete frame beam and the second reinforced concrete frame beam.

[0064] (5) Install the upper column stirrups 4 to form the column reinforcement cage;

[0065] (6) Formwork is erected for the reinforced concrete first frame beam concrete 6, reinforced concrete second frame beam concrete 10, and ring beam concrete 18. The upper column concrete 2, lower column concrete 15, reinforced concrete first frame beam concrete 6, reinforced concrete second frame beam concrete 10 and ring beam concrete 18 are poured. After curing and demolding, the beam-column joint of the present invention is formed.

Claims

1. A steel pipe-confined reinforced concrete ring beam joint, characterized in that, It includes a steel pipe confined reinforced concrete column (5), a steel pipe confined reinforced concrete column (17), an internal steel pipe ring beam node (24), a reinforced concrete first frame beam (9), and a reinforced concrete second frame beam (13). The upper column (5) and lower column (17) of the steel pipe confined reinforced concrete column are located on the upper and lower sides of the built-in steel pipe ring beam node (24), respectively; the longitudinal reinforcement (3) in the upper column (5) and lower column (17) of the steel pipe confined reinforced concrete column continuously penetrates the built-in steel pipe ring beam node (24) without interruption. Two sets of reinforced concrete first frame beams (9) and reinforced concrete second frame beams (13) are provided on the outer periphery of the built-in steel pipe ring beam node (24). The reinforced concrete first frame beams (9) and reinforced concrete second frame beams (13) are arranged perpendicularly to each other. The longitudinal bars (7) of the reinforced concrete first frame beam and the longitudinal bars (11) of the reinforced concrete second frame beam continuously pass through the node area without interruption. The built-in steel pipe ring beam node (24) includes ring beam concrete (18), ring beam stirrups (19), built-in steel pipe (20), studs (21), structural stirrups (22), and stirrups (23); the built-in steel pipe (20) can replace the stirrups in the traditional reinforced concrete beam-column node; the built-in steel pipe (20) is erected inside the structural stirrups (22), the studs (21) are fixedly connected to the outside of the built-in steel pipe (20), the stirrups (23) are bound to the structural stirrups (22) to form a whole, the ring beam concrete (18) is poured outside the structural stirrups (22), and the ring beam stirrups (19) only serve to form a skeleton, and are respectively set on the upper, middle and lower sides of the ring beam concrete (18); When the height difference between the first reinforced concrete frame beam (9) and the second reinforced concrete frame beam (13) is greater than 1 / 4 of the height of the first reinforced concrete frame beam (9) or greater than 200mm, the number of the built-in steel pipes (20) is two. The two built-in steel pipes (20) are respectively set as upper steel pipe and lower steel pipe in the height direction, so that the longitudinal reinforcement of the frame beams of different heights can pass through the node area.

2. The steel pipe-confined reinforced concrete ring beam joint according to claim 1, characterized in that, The upper column (5) of the steel pipe confined reinforced concrete column includes an upper column steel pipe (1), upper column concrete (2), column longitudinal reinforcement (3) and upper column stirrups (4). The column longitudinal reinforcement (3) and the upper column stirrups (4) form the upper column reinforcement cage. The upper column concrete (2) is poured into the upper column steel pipe (1). The upper column steel pipe (1) and the upper column reinforcement cage form the upper column (5) of the steel pipe confined reinforced concrete column. The lower column (17) of the steel pipe confined reinforced concrete column includes a lower column steel pipe (14), lower column concrete (15), column longitudinal reinforcement (3) and lower column stirrups (16). The lower column stirrups (16) and the column longitudinal reinforcement (3) form the lower column reinforcement cage. The lower column concrete (15) is poured into the lower column steel pipe (14). The lower column steel pipe (14) and the lower column reinforcement cage form the lower column (17) of the steel pipe confined reinforced concrete column.

3. A steel pipe-confined reinforced concrete ring beam joint according to claim 2, characterized in that, The thickness of the built-in steel pipe (20) shall not be less than that of the column steel pipe; when the height difference between the sections of the first reinforced concrete frame beam (9) and the second reinforced concrete frame beam (13) is less than 1 / 4 of the section height of the first reinforced concrete frame beam (9) and less than 200mm, the number of built-in steel pipes (20) shall be one, and its height shall not be greater than the distance from the bottom row of the upper longitudinal reinforcement of the second reinforced concrete frame beam (13) to the top row of the lower longitudinal reinforcement of the second reinforced concrete frame beam (13).

4. A steel pipe-confined reinforced concrete ring beam joint according to claim 3, characterized in that, The thickness of the built-in steel pipe (20) is not less than the thickness of the column steel pipe.

5. A steel pipe-confined reinforced concrete ring beam joint according to claim 2, characterized in that, The upper column steel pipe (1), the inner steel pipe (20), and the lower column steel pipe (14) can be made of steel plate or seamless steel pipe.

6. A steel pipe-confined reinforced concrete ring beam joint according to claim 1, characterized in that, When there is one internal steel pipe (20), the studs (21) are arranged in at least two rows in the vertical direction; when there are two internal steel pipes (20), the studs (21) on each internal steel pipe (20) are arranged in at least one row in the vertical direction.

7. A steel pipe-confined reinforced concrete ring beam joint according to claim 1, characterized in that, The shape of the structural stirrups (22) is circular or square, and the number of layers of structural stirrups (22) in the ring beam concrete (18) is not less than two.

8. A steel pipe-confined reinforced concrete ring beam joint according to claim 1, characterized in that, The diameter of the stirrup (23) shall not be less than the diameter of the structural stirrup (22), and the number of stirrups (23) shall not be less than four.

9. A steel pipe-confined reinforced concrete ring beam joint according to claim 1, characterized in that, The built-in steel pipe ring beam node (24) is a cylindrical or cubic structure.

10. A steel pipe-confined reinforced concrete ring beam joint according to claim 1, characterized in that, The inner diameter of the built-in steel pipe (20) is equal to the inner diameter of the column stirrup.

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