A prefabricated steel tube confined concrete column-RC beam composite node and installation method

Abstract

The present invention relates to the technical field of building structural components, and specifically to an assembled steel tube constrained concrete column-RC beam composite node and an installation method. It includes assembled steel tube constrained reinforced concrete columns and reinforced concrete beams. The assembled steel tube constrained reinforced concrete columns include reinforced concrete columns and steel tubes wrapped in the upper column of the node area, the node area steel tubes, and the lower column of the node area steel tubes, wherein the node area steel tubes include the upper steel tube of the node area, the lower steel tube of the node area, the first tension groove steel plate, and the second tension groove steel plate. The node area annular steel plate, an outwardly extending perforated partition, and the tension groove steel plate provide tension constraints for the upper and lower steel pipe ends, and the internal cross structure expands the concrete constraint area. The node strengthens the constraint effect of the node area steel tube on the concrete, increases the structural stability, and has high shear and axial compression bearing capacity, achieving the purpose of "strong node and weak component", and the installation method reduces the difficulty and complexity of on-site construction and improves construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of building structural components, and in particular to an assembled steel tube confined concrete column-RC beam composite node and an installation method thereof. Background Art

[0002] Steel tube confined concrete structure is a steel-concrete composite structure that makes full use of the complementarity of steel structure and concrete structure, effectively exerts the tensile strength and plasticity of steel and the compressive strength of concrete. Since the steel tube in the node area is disconnected from the steel tubes of the upper and lower columns to form a structural joint, the steel tube can fully exert its restraining effect on the concrete when subjected to a large longitudinal load. Steel tube confined reinforced concrete columns have outstanding advantages such as high bearing capacity, strong elastic-plastic deformation capacity, good energy dissipation performance, outstanding seismic performance, and template saving. It can be foreseen that it will be widely used in structures such as high-rise buildings, large-span structures, tall structures, large and heavy-loaded complex industrial plants, and achieve good economic and social benefits.

[0003] In recent years, with the development of the construction industry, the shortcomings of cast-in-place structures in terms of labor costs, environmental pollution, construction period and quality control have become increasingly prominent, and it has gradually become difficult to meet the actual needs of the current development of the construction industry. The beam-column node is an important force transmission part between components. The insufficient strength and poor ductility of the beam-column node are the weakest links in the structure and the main reason for the failure of such structures. In actual projects, a large number of steel tube confined concrete columns adopt a square cross-section structure. The middle part of the steel tube has weak restraint on the core concrete. When the vertical load is large, the steel tube loses its restraint on the concrete due to the large lateral deformation, and the middle steel tube at the end of the steel tube in the node area will be detached from the concrete. The node bearing capacity of the steel tube confined concrete of the ordinary structure is lower than that of the comparative short column, and the failure mode is manifested as shear failure in the node area or concrete crushing failure. In order to achieve the goal of the "strong node, weak component" mechanism, increase the restraint effect of the steel tube on the concrete, and strengthen the shear resistance and axial compression bearing capacity of the node, it is necessary to design a structure to achieve it.

[0004] Existing steel tube constrained reinforced concrete column-reinforced concrete beam nodes adopt steel tube semi-through nodes or steel tube ring reinforcement nodes. The opening of steel tube semi-through nodes reduces the restraining effect of the steel tube on the concrete in the node area, and it is difficult to place the overall position of the steel tube during construction. If the opening is too small, it will make it difficult to thread the longitudinal reinforcement of the beam. The steel tube ring reinforcement node has a large diameter of the column stirrups in the node area, a large workload of on-site welding of ring reinforcements, and dense stirrups in the node area. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in view of the shortcomings of the prior art, a prefabricated steel tube constrained concrete column-RC beam composite node and an installation method are provided, the node strengthens the restraining effect of the steel tube in the node area on the concrete, increases the structural stability, and has high shear and axial compression bearing capacity, thereby achieving the purpose of "strong node and weak component", and the installation method reduces the difficulty and complexity of on-site construction and improves construction efficiency.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A prefabricated steel tube confined concrete column-RC beam composite node, composed of a prefabricated steel tube confined reinforced concrete column 1 and a reinforced concrete beam 2, the prefabricated steel tube confined reinforced concrete column 1 includes a reinforced concrete column 3, the reinforced concrete column 3 is sequentially provided with a node area upper column steel pipe 4, a node area steel pipe 5, and a node area lower column steel pipe 6 from top to bottom, the node area steel pipe 5 is composed of a node area upper steel pipe 7, a node area middle section steel pipe, and a node area lower steel pipe 8 which are sequentially connected from top to bottom;

[0008] The middle section of the node area steel pipe includes an outwardly extending perforated partition plate 10, and the outwardly extending perforated partition plate 10 is externally sleeved with a node area annular steel plate 9. The top of the node area upper steel pipe 7 and the bottom of the node area lower steel pipe 8 are both provided with a first pair of tension groove steel plates 11 and a second pair of tension groove steel plates 12 arranged in a cross pattern.

[0009] Furthermore, structural seams are provided between the top and bottom of the node area steel pipe 5 and the upper end column steel pipe 4 and the lower end column steel pipe 6 in the node area, respectively.

[0010] Furthermore, beam section openings 20 are provided at the bottom of the upper steel pipe 7 in the node area and at the top of the lower steel pipe 8 in the node area.

[0011] Furthermore, a circular opening is opened in the middle of the extended perforated partition plate 10, a plurality of arc-shaped openings are opened on the inner side of the edge of the extended perforated partition plate 10, an extended steel plate is provided on the outer side of the edge of the extended perforated partition plate 10, and a plurality of circular holes are opened on the extended steel plate.

[0012] Furthermore, a plurality of T-shaped tenons 19 are evenly arranged on the inner wall of the annular steel plate 9 in the node area.

[0013] Furthermore, the bottom of the upper steel pipe 7 in the node area and the top of the lower steel pipe 8 in the node area are provided with a plurality of sixth grooves 18 matched with the T-shaped tenons 19; the sixth grooves of the upper steel pipe in the node area and the lower steel pipe in the node area are connected with the T-shaped tenons on the inner wall of the annular steel plate in the node area by mortise and tenon connection.

[0014] Furthermore, the first pair of tension groove steel plates 11 has a single second groove 14 on one side and two third grooves 15 on the other side;

[0015] A single fourth groove 16 matching the second groove 14 is formed on one side of the second tension groove steel plate 12 , and two fifth grooves 17 are formed on the other side.

[0016] Furthermore, the top of the upper steel pipe 7 in the node area and the bottom of the lower steel pipe 8 in the node area are both provided with a first groove 13 matched with the third groove 15 and the fifth groove 17 .

[0017] Furthermore, the extended steel plate outside the edge of the extended perforated partition 10 is connected to the reinforced concrete beam 2; the multiple longitudinal steel bars embedded in the reinforced concrete beam 2 pass through the beam section openings 20 opened at the bottom of the upper steel pipe 7 in the node area and the top of the lower steel pipe 8 in the node area and extend into the reinforced concrete column 3.

[0018] Compared with the prior art, the present invention has the following main advantages:

[0019] 1. The present invention realizes the overall connection of the node area by respectively performing mortise and tenon joints with the upper steel pipe and the lower steel pipe of the node area and welding the seams at the external connection points of the middle section steel pipe of the node area; the grooves of the first tension groove steel plate and the second tension groove steel plate are connected in the steel pipe column of the node area to form a field-shaped structure, which expands the constraint area of ​​the core concrete and increases the shear resistance and stiffness of the node. After the fifth groove of the tension groove steel plate and the first groove of the steel pipe are embedded in each other, the tension groove steel plate provides a tensile constraint force for the steel pipe, and the groove structure is conducive to installation, reducing the difficulty of construction;

[0020] 2. The present invention enhances the restraining capacity of the steel pipe on the core concrete through the annular steel plate in the node area, prevents the buckling of the steel pipe column corners of the upper steel pipe and the lower steel pipe in the node area, provides welding positions for the upper steel pipe and the lower steel pipe in the node area, and no convex corners appear indoors. The T-shaped tenon is connected with the sixth groove of the upper steel pipe and the lower steel pipe in the node area to increase the pull-out resistance of the steel pipe. The self-locking principle is used to enhance the integrity of the steel pipe in the node area and strengthen the bending stiffness of the node. At the same time, the upper and lower ends of the T-shaped tenon are used as the card slots of the extended hole partition, which increases the bearing capacity of the extended hole partition. The opening width of the sixth groove is slightly larger than the T-shaped tenon, which increases the installation tolerance.

[0021] 3. The circular opening in the middle of the extended perforated partition of the present invention is conducive to concrete pouring and tamping. The arc-shaped openings on the four sides and the circular openings in the four corners increase the cross-sectional area of ​​the concrete column at the extended perforated partition, and facilitate the threading of the column longitudinal reinforcement. The extended steel plate of the extended perforated partition has holes to enhance the bonding strength of the beam concrete interface, reduce the voiding and relative slippage of the steel and concrete interface, and the concrete aggregate passes through the hole to form a concrete tenon. Its normal pull-out effect also improves the tensile bearing capacity and fatigue of the node. There is only one partition in the core area, compared with the two partitions in the prior art. The beam-column node is more convenient for concrete pouring and vibration. The width of the extended steel plate part of the perforated partition is smaller than the width of the beam, which is convenient for arranging the stirrups with the beam. The slightly protruding part of the perforated partition increases the upper and lower contact area with the annular steel plate in the node area, which is conducive to the dispersion of the bearing capacity of the extended perforated partition. The extended perforated partition bears the axial force of the concrete and the axial force transmitted by the upper and lower steel pipes in the node area due to bonding friction. The extended steel plate part is conducive to the transmission of the shear force of the beam, increasing the shear bearing capacity of the node. In addition, the extended perforated partition strengthens the oblique compression support by constraining the core concrete of the node, expanding the range of the oblique compression rod.

[0022] 4. The installation method of the present invention is to pour concrete after the installation of the assembled steel tube restrained concrete column-RC beam composite node is completed, and the steel tube serves as a template. Only the upper and lower steel tubes of the node area column need to be rectangular cut; most of the components are prefabricated in the factory and only need to be assembled on site, which effectively solves the problem of complex construction of beam-column nodes. The assembled steel tube restrained concrete column-RC beam composite node has reasonable force transmission and strong bearing capacity, achieving the purpose of "strong column and weak beam", and has the advantages of convenient construction, good ductility and seismic performance, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an overall schematic diagram of the node structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the assembled steel pipe column of the present invention;

[0025] Figure 3 This is a schematic diagram of the steel pipe connection in the node area of ​​the present invention;

[0026] Figure 4 This is a schematic diagram of a steel pipe connection member in the middle section of a node area of ​​the present invention;

[0027] Figure 5 It is a schematic diagram of the upper steel pipe connection member of the node area of ​​the present invention;

[0028] Figure 6 It is a schematic diagram of the steel pipe connection member at the lower part of the node area of ​​the present invention;

[0029] Figure 7 It is a top view of the node structure of the present invention;

[0030] Figure 8 It is a side view of the assembled steel tube-confined reinforced concrete column-reinforced beam of the present invention.

[0031] In the figure: 1. Prefabricated steel pipe constrained reinforced concrete column; 2. Reinforced concrete beam; 3. Reinforced concrete column; 4. Steel pipe at the upper end column of the node area; 5. Steel pipe at the node area; 6. Steel pipe at the lower end column of the node area; 7. Upper steel pipe at the node area; 8. Lower steel pipe at the node area; 9. Annular steel plate at the node area; 10. Outwardly extending perforated partition; 11. First tension groove steel plate; 12. Second tension groove steel plate; 13. First groove; 14. Second groove; 15. Third groove; 16. Fourth groove; 17. Fifth groove; 18. Sixth groove; 19. T-shaped tenon; 20. Opening. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0034] 1. A prefabricated steel tube confined concrete column-RC beam composite node

[0035] like Figures 1 to 8 As shown, the present invention provides an assembled steel tube confined concrete column-RC beam composite node, which is composed of an assembled steel tube confined reinforced concrete column 1 and a reinforced concrete beam 2. The assembled steel tube confined reinforced concrete column 1 includes a reinforced concrete column 3, and the reinforced concrete column 3 is sequentially provided with an upper column steel pipe 4, a node area steel pipe 5, and a lower column steel pipe 6 in the node area from top to bottom. The node area steel pipe 5 is composed of an upper node area steel pipe 7, a middle section node area steel pipe, and a lower node area steel pipe 8 connected sequentially from top to bottom;

[0036] The middle section of the node area steel pipe includes an outwardly extending perforated partition plate 10, and the outwardly extending perforated partition plate 10 is externally sleeved with a node area annular steel plate 9. The top of the node area upper steel pipe 7 and the bottom of the node area lower steel pipe 8 are both provided with a first pair of tension groove steel plates 11 and a second pair of tension groove steel plates 12 arranged in a cross pattern.

[0037] Furthermore, structural seams are provided between the top and bottom of the node area steel pipe 5 and the upper end column steel pipe 4 and the lower end column steel pipe 6 in the node area, respectively.

[0038] Furthermore, beam section openings 20 are provided at the bottom of the upper steel pipe 7 in the node area and at the top of the lower steel pipe 8 in the node area.

[0039] Furthermore, a circular opening is opened in the middle of the extended perforated partition plate 10, a plurality of arc-shaped openings are opened on the inner side of the edge of the extended perforated partition plate 10, an extended steel plate is provided on the outer side of the edge of the extended perforated partition plate 10, and a plurality of circular holes are opened on the extended steel plate.

[0040] Furthermore, a plurality of T-shaped tenons 19 are evenly arranged on the inner wall of the annular steel plate 9 in the node area.

[0041] Furthermore, the bottom of the upper steel pipe 7 in the node area and the top of the lower steel pipe 8 in the node area are provided with a plurality of sixth grooves 18 matched with the T-shaped tenons 19; the sixth grooves of the upper steel pipe in the node area and the lower steel pipe in the node area are connected with the T-shaped tenons on the inner wall of the annular steel plate in the node area by mortise and tenon connection.

[0042] Furthermore, the first pair of tension groove steel plates 11 has a single second groove 14 on one side and two third grooves 15 on the other side;

[0043] A single fourth groove 16 matching the second groove 14 is formed on one side of the second tension groove steel plate 12 , and two fifth grooves 17 are formed on the other side.

[0044] Furthermore, the top of the upper steel pipe 7 in the node area and the bottom of the lower steel pipe 8 in the node area are both provided with a first groove 13 matched with the third groove 15 and the fifth groove 17 .

[0045] Furthermore, the extended steel plate outside the edge of the extended perforated partition 10 is connected to the reinforced concrete beam 2; the multiple longitudinal steel bars embedded in the reinforced concrete beam 2 pass through the beam section openings 20 opened at the bottom of the upper steel pipe 7 in the node area and the top of the lower steel pipe 8 in the node area and extend into the reinforced concrete column 3.

[0046] Optionally, the opening depth of the second groove and the fourth groove is half of the height of the pulling groove steel plate; the opening depth of the first groove is equal to the opening depths of the third groove and the fifth groove; the opening depth of the sixth groove is equal to the height of the T-shaped tenon, and the opening width of the sixth groove may be slightly larger than the width of the T-shaped tenon.

[0047] Optionally, the upper column steel pipe in the node area, the lower column steel pipe in the node area and the node area steel pipe are not connected, and a steel pipe structural seam of 10 mm to 20 mm is left in the middle.

[0048] Optionally, the node area upper column steel pipe, the node area steel pipe, and the node area lower column steel pipe are all square steel pipes.

[0049] Optionally, reinforced concrete beams are provided on the four end faces of the steel pipe in the node area.

[0050] Optionally, the concrete is ordinary concrete, high performance concrete or recycled concrete.

[0051] 2. Installation method of a composite node of prefabricated steel tube confined concrete column-RC beam

[0052] Based on the same inventive concept, the embodiment of the present application also provides a method for installing the above-mentioned assembled steel tube confined concrete column-RC beam composite node, which specifically includes the following steps:

[0053] S1, confirm the size: determine the size of the upper column steel pipe 4, the node area steel pipe 5, the lower column steel pipe 6 and the size of the beam section opening 20 according to the size of the reinforced concrete beam 2 and the reinforced concrete column 3;

[0054] S2, factory prefabrication: the upper steel pipe 7 and the lower steel pipe 8 of the node area are welded by four rectangular perforated steel plates; the first tension groove steel plate 11 and the second tension groove steel plate 12 are made by slotting rectangular steel plates; the extended perforated partition plate 10 is made by laser cutting of rectangular steel plates; the annular steel plate 9 of the node area is composed of four steel plates with a hole in the middle, and a T-shaped tenon 19 is welded on the inner wall of each steel plate;

[0055] S3, component assembly: the node area annular steel plate 9 is sleeved around the extended perforated partition plate 10 to form a middle section steel pipe of the node area; two sets of first pair of tension groove steel plates 11 and second pair of tension groove steel plates 12 are assembled in a cross shape and inserted into the top of the node area upper steel pipe 7 and the bottom of the node area lower steel pipe 8 respectively;

[0056] S4, connection between the assembled steel pipe restrained steel column and the beam reinforcement: install the lower steel pipe 8 in the node area to the bottom of the steel pipe in the middle section of the node area, and make the lower longitudinal reinforcement in the reinforced concrete beam pass through the beam section opening at the top of the lower steel pipe 8 in the node area, and tie the longitudinal reinforcement in the lower steel pipe column in the node area and the stirrups in the column; install the upper steel pipe 7 in the node area to the top of the steel pipe in the middle section of the node area, and make the upper longitudinal reinforcement in the reinforced concrete beam pass through the beam section opening at the bottom of the upper steel pipe 7 in the node area, and tie the longitudinal reinforcement in the upper steel pipe column in the node area and the stirrups in the column; weld the joints at the external connection between the upper steel pipe in the node area and the lower steel pipe in the node area;

[0057] (The field-shaped structural area formed by the tension groove steel plates is not provided with column stirrups)

[0058] S5, installing the upper column steel pipe in the node area and the lower column steel pipe in the node area to form an integrally assembled steel pipe restrained steel bar column;

[0059] S6, concrete pouring: After the prefabricated steel tube restrained reinforced concrete column and the beam reinforcement are connected and installed, concrete pouring of the column and beam at the node is carried out to form an integral prefabricated steel tube restrained reinforced concrete column 1 and reinforced concrete beam 2.

[0060] In summary, the present invention adopts an assembled steel tube confined concrete column-RC beam composite node and installation method:

[0061] 1. The overall connection of the node area is achieved by connecting the middle section of the steel pipe in the node area with the upper steel pipe and the lower steel pipe in the node area through mortise and tenon joints and welding the seams at the external connections; the grooves of the first tension groove steel plate and the second tension groove steel plate are connected in the steel pipe column in the node area to form a field-shaped structure, which expands the constraint area of ​​the core concrete and increases the shear resistance and stiffness of the node. After the fifth groove of the tension groove steel plate and the first groove of the steel pipe are embedded in each other, the tension groove steel plate provides tensile constraint force for the steel pipe, and the groove structure is conducive to installation, reducing the difficulty of construction;

[0062] 2. The annular steel plate in the node area enhances the restraint capacity of the steel pipe on the core concrete, prevents the buckling of the steel pipe column corners of the upper and lower steel pipes in the node area, provides welding positions for the upper and lower steel pipes in the node area, and no convex corners appear indoors. The T-shaped tenon is connected with the sixth groove of the upper and lower steel pipes in the node area to increase the pull-out resistance of the steel pipe. The self-locking principle is used to enhance the integrity of the steel pipe in the node area and strengthen the bending stiffness of the node. At the same time, the upper and lower ends of the T-shaped tenon are used as the card slots of the extended hole partition, which increases the bearing capacity of the extended hole partition. The opening width of the sixth groove is slightly larger than the T-shaped tenon, which increases the installation tolerance.

[0063] 3. The circular opening in the middle of the extended perforated partition is conducive to concrete pouring and tamping. The arc-shaped openings on the four sides and the circular openings in the four corners increase the cross-sectional area of ​​the concrete column at the extended perforated partition, and facilitate the threading of the column longitudinal reinforcement. The extended steel plate of the extended perforated partition has some openings to enhance the bonding strength of the beam-concrete interface, reduce the voiding and relative slippage of the steel-concrete interface, and the concrete aggregate passes through the hole to form a concrete tenon. Its normal pull-out effect also improves the tensile bearing capacity and fatigue of the node. There is only one partition in the core area, compared with the beam-column with two partitions in the prior art. The node is more convenient for concrete pouring and vibration. The width of the extended steel plate part of the perforated partition is less than the width of the beam, which is convenient for arranging the stirrups with the beam. The slightly protruding part of the perforated partition increases the upper and lower contact area with the annular steel plate in the node area, which is conducive to the dispersion of the bearing capacity of the extended perforated partition. The extended perforated partition bears the axial force of the concrete and the axial force transmitted by the upper and lower steel pipes in the node area due to bonding friction. The extended steel plate part is conducive to the shear force transmission of the beam, increasing the shear bearing capacity of the node, and the extended perforated partition strengthens the oblique compression support by constraining the core concrete of the node, expanding the range of the oblique compression rod;

[0064] 4. The installation method of the present invention is to pour concrete after the installation of the assembled steel tube restrained concrete column-RC beam composite node is completed, and the steel tube serves as a template. Only the upper and lower steel tubes of the node area column need to be rectangular cut; most of the components are prefabricated in the factory and only need to be assembled on site, which effectively solves the problem of complex construction of beam-column nodes. The assembled steel tube restrained concrete column-RC beam composite node has reasonable force transmission and strong bearing capacity, achieving the purpose of "strong column and weak beam", and has the advantages of convenient construction, good ductility and seismic performance, etc.

[0065] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite joint of a prefabricated steel tube confined concrete column and a RC beam, comprising a prefabricated steel tube confined reinforced concrete column (1) and a reinforced concrete beam (2), wherein the prefabricated steel tube confined reinforced concrete column (1) comprises a reinforced concrete column (3), characterized in that: The reinforced concrete column (3) is provided with a node area upper column steel pipe (4), a node area steel pipe (5), and a node area lower column steel pipe (6) in sequence from top to bottom, and the node area steel pipe (5) is composed of a node area upper steel pipe (7), a node area middle section steel pipe, and a node area lower steel pipe (8) which are connected in sequence from top to bottom; The middle section of the node area steel pipe comprises an outwardly extending perforated baffle plate (10), the outwardly extending perforated baffle plate (10) is sleeved with a node area annular steel plate (9), and the top of the node area upper steel pipe (7) and the bottom of the node area lower steel pipe (8) are both provided with a first pair of tension groove steel plates (11) and a second pair of tension groove steel plates (12) arranged in a cross pattern; A circular opening is provided in the middle of the outwardly extending perforated partition plate (10), a plurality of arc-shaped openings are provided on the inner side of the edge of the outwardly extending perforated partition plate (10), an outwardly extending steel plate is provided on the outer side of the edge of the outwardly extending perforated partition plate (10), and a plurality of circular holes are provided on the outwardly extending steel plate; A plurality of T-shaped tenons (19) are evenly arranged on the inner wall of the node area annular steel plate (9); The bottom of the node area upper steel pipe (7) and the top of the node area lower steel pipe (8) are both provided with a plurality of sixth grooves (18) adapted to the T-shaped tenons (19).

2. The assembled steel tube confined concrete column-RC beam composite node according to claim 1, characterized in that: Structural joints are provided between the node area upper end column steel pipe (4) and the node area lower end column steel pipe (6) and the top and bottom of the node area steel pipe (5), respectively.

3. The assembled steel tube confined concrete column-RC beam composite node according to claim 2, characterized in that: The bottom of the upper steel pipe (7) in the node area and the top of the lower steel pipe (8) in the node area are both provided with beam cross-section openings (20).

4. The assembled steel tube confined concrete column-RC beam composite node according to claim 3 is characterized in that: The first pair of tension groove steel plates (11) has a single second groove (14) on one side and two third grooves (15) on the other side; One side of the second tension groove steel plate (12) is provided with a single fourth groove (16) matched with the second groove (14), and the other side is provided with two fifth grooves (17).

5. The assembled steel tube confined concrete column-RC beam composite node according to claim 4, characterized in that: The top of the upper steel pipe (7) in the node area and the bottom of the lower steel pipe (8) in the node area are both provided with a first groove (13) that matches the third groove (15) and the fifth groove (17).

6. The assembled steel tube confined concrete column-RC beam composite node according to claim 5, characterized in that: The extended steel plate outside the edge of the extended perforated partition plate (10) is connected to the reinforced concrete beam (2); a plurality of longitudinal steel bars embedded in the reinforced concrete beam (2) pass through the beam section openings (20) opened at the bottom of the upper steel pipe (7) in the node area and at the top of the lower steel pipe (8) in the node area, and then extend into the reinforced concrete column (3).

7. A method for installing the assembled steel tube confined concrete column-RC beam composite node according to claim 6, characterized in that: The steps include: S1, confirming the size: determining the size of the node area upper column steel pipe (4), the node area steel pipe (5), the node area lower column steel pipe (6) and the size of the beam section opening (20) according to the size of the reinforced concrete beam (2) and the reinforced concrete column (3); S2, factory prefabrication: the node area upper steel pipe (7) and the node area lower steel pipe (8) are welded from four rectangular perforated steel plates; the first pair of tension groove steel plates (11) and the second pair of tension groove steel plates (12) are made by slotting rectangular steel plates; the extended perforated partition plate (10) is made by laser cutting of rectangular steel plates; the node area annular steel plate (9) is composed of four steel plates with a hole in the middle, and a T-shaped tenon (19) is welded on the inner wall of each steel plate; S3, component assembly: the node area annular steel plate (9) is sleeved around the extended perforated partition plate (10) to form a middle section steel pipe of the node area; two sets of first tension groove steel plates (11) and second tension groove steel plates (12) are assembled in a cross shape and inserted into the top of the node area upper steel pipe (7) and the bottom of the node area lower steel pipe (8) respectively; S4, connection between the assembled steel pipe restrained steel column and the beam reinforcement: installing the lower steel pipe (8) in the node area to the bottom of the steel pipe in the middle section of the node area, and allowing the lower longitudinal reinforcement in the reinforced concrete beam to pass through the beam section opening at the top of the lower steel pipe (8) in the node area, and tying the longitudinal reinforcement in the lower steel pipe column in the node area and the stirrups in the column; installing the upper steel pipe (7) in the node area to the top of the steel pipe in the middle section of the node area, and allowing the upper longitudinal reinforcement in the reinforced concrete beam to pass through the beam section opening at the bottom of the upper steel pipe (7) in the node area, and tying the longitudinal reinforcement in the upper steel pipe column in the node area and the stirrups in the column; welding the joints at the external connection between the upper steel pipe in the node area and the lower steel pipe in the node area; S5, installing the upper column steel pipe in the node area and the lower column steel pipe in the node area to form an integrally assembled steel pipe restrained steel bar column; S6, concrete pouring: After the assembled steel tube restrained reinforced concrete column and the beam reinforcement are connected and installed, concrete pouring is performed on the column and the beam at the node to form an integral assembled steel tube restrained reinforced concrete column (1) and reinforced concrete beam (2).

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