Fabricated cross-layer concrete column frame connecting joint structure and construction method

Abstract

The invention provides a fabricated cross-layer concrete column frame connecting joint structure and a construction method. The fabricated cross-layer concrete column frame connecting joint structure comprises a cross-layer concrete stand column, a column-column connecting joint is arranged at the end of the cross-layer concrete stand column, and a plurality of cross-layer beam column connecting joints connected with beams are arranged in the middle of the cross-layer concrete stand column. The column-column connecting joints and the beam-column connecting joints are in a rectangular steel pipe concrete combination form. According to the structure, the distance between a column-column connecting joint and a beam surface is 1.2-1.3 m or the smaller value of half of the clear height of a column is selected, and column longitudinal bars are welded to the outer wall of a rectangular steel pipe assembly; the cross-layer beam-column connecting joint comprises a joint area, longitudinal bars in the middle of the column are welded to the inner wall of the rectangular steel pipe assembly, and corner longitudinal bars and longitudinal bars close to the corner penetrate through the rectangular steel pipe assembly to be connected with the upper-layer column and the lower-layer column. The rectangular steel pipe assemblies of the column-column connecting joints and the beam-column connecting joints can form standardized products, batch production is achieved in advance in a factory, and the production efficiency and quality are improved; a steel-concrete combined stress form is adopted at the connecting node position, so that the node performance can be improved; the number of connecting nodes is reduced through the cross-layer prefabrication mode, and the integrity of the structure is improved; and the connecting node position adopts a steel structure connecting form, so that support-free construction can be realized, and the field construction efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the field of prefabricated buildings, and in particular to a prefabricated cross-layer concrete column frame connection node structure and a construction method. Background Art

[0002] Prefabricated cross-layer columns can reduce the number of templates produced in the factory, reduce the number of column-column joints at the construction site, and improve the integrity of the structure. With the improvement of industrialization level and transportation and hoisting capacity, the use of large-span prefabricated components is increasing.

[0003] In the current existing technology, the longitudinal reinforcement of the column is overlapped and welded to the outer wall of the steel pipe. Due to the diameter of the steel bar and the stirrup itself plus the required protective layer, the cross section of the steel pipe is greatly weakened, and the connection node is a pure steel structure, which increases the thickness of the rectangular steel pipe, that is, the amount of steel used. When the longitudinal reinforcement at the corner of the column is welded to the corner of the rectangular steel pipe, the welds on both sides of the steel bar are subjected to close forces, and when the rectangular steel pipe is formed by welding with steel plates, the welds will overlap, which will have an adverse effect on the welding quality of the longitudinal reinforcement and the steel pipe. The workload of welding all the longitudinal reinforcements of the column to the steel pipe wall is extremely large, and it is also easy to cause stress concentration on the steel pipe wall, which will have an adverse effect on the performance of the rectangular steel pipe; the rectangular steel pipes at the upper and lower nodes are welded together by the longitudinal reinforcements, and the stress generated by welding is not easy to release, which affects the performance of the longitudinal reinforcement.

[0004] At the same time, the bottom connection node of the cross-layer column is connected by bolt flange. In order to meet the requirements of bolt margin and spacing, the flange is easy to protrude from the edge of the column or fail to meet the requirements of the protective layer, affecting its use and durability.

[0005] In current technology, column longitudinal reinforcement is welded to the outside of steel pipes. First, it is difficult to determine the size before designing, which makes it difficult to standardize and mass-produce rectangular steel pipe components in factories in advance. Second, the different stresses of each building structure determine the different specifications of column longitudinal reinforcement, and it is also difficult to weld the column longitudinal reinforcement to steel connectors in advance, which greatly affects the later production and processing period and delivery cycle. Third, the beam-column connection node area cannot be cast at one time with the prefabricated column in the factory, but can only be cast twice at the construction site, which increases the construction period and labor cost.

[0006] Therefore, how to reduce the amount of steel used and improve production and construction efficiency, while solving the problems of unreasonable structure and force, has become a technical problem that technical personnel in this field need to solve urgently. Summary of the invention

[0007] The main purpose of the present invention is to provide an assembled cross-layer concrete column frame connection node structure and a construction method to solve the problems in the above-mentioned background technology.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: comprising a cross-layer concrete column, a column bottom rectangular steel pipe assembly is provided at the bottom of the cross-layer concrete column, a column top rectangular steel pipe assembly is provided at the top, and a plurality of column middle rectangular steel pipe assemblies connected to the beam are provided in the middle of the cross-layer concrete column; The cross-layer concrete column is provided with column middle longitudinal reinforcements around the four corners and column corner longitudinal reinforcements at the four corners. The column middle longitudinal reinforcement is welded to the outer wall of the first rectangular steel tube in the column bottom rectangular steel tube assembly, welded to the outer wall of the second rectangular steel tube in the column top rectangular steel tube assembly, and welded to the inner wall of the third rectangular steel tube in the column middle rectangular steel tube assembly. The longitudinal reinforcement at the column corner is welded to the outer wall of the rectangular steel pipe assembly at the bottom of the column and to the outer wall of the rectangular steel pipe assembly at the top of the column. The longitudinal reinforcement at the column corner runs through the rectangular steel pipe assembly in the middle of the column. A web connecting plate is fixedly arranged on the side of the rectangular steel pipe assembly in the column opposite to the beam. The end of the beam is an H-shaped steel. The web of the H-shaped steel is locked and fixed with the web connecting plate by bolts during installation.

[0009] Preferably, the column bottom rectangular steel pipe assembly includes a first rectangular steel pipe embedded in the bottom of the precast concrete column, and the column top rectangular steel pipe assembly includes a second rectangular steel pipe embedded in the top of the precast concrete column. The first rectangular steel pipe and the second rectangular steel pipe are welded into a rectangle by four steel plates, and the first rectangular steel pipe and the second rectangular steel pipe have the same structure.

[0010] Preferably, the first rectangular steel tube and the second rectangular steel tube are provided with a plurality of corresponding protruding first flanges on their circumferential sides, and the corresponding flanges are fixed by flange connecting plates and bolts; The first rectangular steel tube and the second rectangular steel tube are overlapped and welded with the first column middle longitudinal reinforcement on both sides of the outer walls. The column corner longitudinal reinforcements at the four corners are overlapped and welded on one side to the outer side of the first rectangular steel tube and the second rectangular steel tube, and overlapped and welded on the outer wall of the flange on the other side.

[0011] Preferably, a lining plate is fixedly provided on the inner side of the top of the second rectangular steel tube, and the lining plate protrudes from the top of the second rectangular steel tube; During installation, the lining plate abuts against the inner wall of the first rectangular steel tube; The bottom of the first rectangular steel pipe is against the second rectangular steel pipe, and each side of the bottom of the first rectangular steel pipe is provided with a first groove for welding and fixing with the second rectangular steel pipe.

[0012] Preferably, an inner partition is fixedly provided in the first rectangular steel tube and the second rectangular steel tube, a grouting pipe and an air outlet pipe are pre-buried in the cross-layer concrete column, one end of the grouting pipe and the air outlet pipe is flush with the forming surface of the cross-layer concrete column, and the other end is connected to the inner partition in the first upper column steel tube; A slurry outlet hole is arranged on the outer side of the second rectangular steel pipe, and the slurry outlet hole is located on the upper part of the inner partition plate in the second rectangular steel pipe.

[0013] Preferably, the rectangular steel tube assembly in the column comprises a third rectangular steel tube prefabricated in the cross-layer concrete column, an upper inner baffle and a lower inner baffle are fixedly arranged in the third rectangular steel tube, and arc through holes are arranged between the four corners of the upper inner baffle and the lower inner baffle and the rectangular steel tube; The inner wall circumferences of both ends of the third rectangular steel tube are welded with column middle longitudinal reinforcements, the column middle longitudinal reinforcements between the upper and lower column middle rectangular steel tube assemblies are connected and fixed by bending or staggered overlap, and the column middle longitudinal reinforcements between the column middle rectangular steel tube assembly and the column bottom rectangular steel tube assembly or the column top rectangular steel tube assembly are the same longitudinal reinforcements, which are respectively welded to the third rectangular steel tube and the first rectangular steel tube or the second rectangular steel tube in the column; The column corner longitudinal reinforcements at the four corners penetrate the rectangular steel pipe assembly in the column, and the column corner longitudinal reinforcements are located in the arc through holes; the column corner longitudinal reinforcements at the four corners are overlap-welded with the outer walls of the first rectangular steel pipe and the second rectangular steel pipe.

[0014] Preferably, the web connecting plate is welded to the third rectangular steel tube, the web of the H-shaped steel at the end of the beam is welded or bolted to the web connecting plate, and the upper and lower flange ends are welded to the outer wall of the third rectangular steel tube.

[0015] Preferably, a grouting hole is provided on the circumference of the third rectangular steel pipe, and the grouting hole is provided between the upper inner baffle and the lower inner baffle; The upper inner partition and the lower inner partition are provided with protruding inner partition flanges on the periphery, and the inner partition flanges extend to the outer wall of the rectangular steel pipe. The upper and lower flanges of the H-shaped steel at the ends of the beam are welded and fixed to the inner partition flanges.

[0016] A construction method for an assembled cross-layer concrete column frame connection node structure, the method steps are as follows: S1. The cross-layer concrete columns are prefabricated in the factory. The rectangular steel pipe components at the bottom of the column, the rectangular steel pipe components in the middle of the column and the rectangular steel pipe components at the top of the column are first assembled and formed. The two ends of the rectangular steel pipe components in the middle of the column are welded with the longitudinal reinforcement in the middle of the column and the stirrups are tied according to the designed floor height; Then, the rectangular steel tube components in the columns of each layer are placed in place and the longitudinal reinforcement in the middle of the columns between the rectangular steel tube components in each column are overlapped, and the longitudinal reinforcement at the column corners is passed through the rectangular steel tube components in each column; Then, the rectangular steel pipe assembly at the bottom of the column and the rectangular steel pipe assembly at the top of the column are placed in place, and are lap-welded to the longitudinal reinforcement at the corner of the column and the longitudinal reinforcement at the middle of the column; Finally, the formwork is supported and the inner part of the rectangular steel pipe component in the column and the outer protective layer of the rectangular steel pipe are integrally cast to form a cross-layer concrete column; S2. During installation, the upper cross-layer concrete column is hoisted so that the upper column bottom rectangular steel pipe assembly is butted with the lower column top rectangular steel pipe assembly, and then the flange connection plate is installed and positioned and locked, and then the first rectangular steel pipe of the upper column and the second rectangular steel pipe of the lower column are welded and fixed, and then the flange connection plate is removed, and finally the unwelded parts are fully penetrated and welded; S3, installation of beams, web connecting plates are welded to the third rectangular steel tube, webs and web connecting plates of H-shaped steel at the ends of beams are welded or bolted, upper and lower flanges of H-shaped steel are welded to the flanges of inner diaphragms or the third rectangular steel tube; S4. Finally, fill the exposed areas of the column-to-column connection nodes and the cross-layer beam-column connection nodes with concrete or grouting material to form a node protection layer.

[0017] The present invention provides an assembled cross-layer concrete column frame connection node structure and construction method, with the following beneficial effects: 1. The distance between the column-to-column connection node and the beam surface is 1.2m-1.3m or half of the column net height, which is a smaller value. This design significantly enhances the integrity and seismic performance of the structure and improves the stability and durability of the structure.

[0018] 2. The cross-layer beam-column connection node includes a node domain. The longitudinal reinforcement in the middle part of the column is welded to the inner wall of the rectangular steel pipe assembly. The longitudinal reinforcement at the corner and the longitudinal reinforcement near the corner pass through the rectangular steel pipe to connect the upper and lower columns. This can form a standardized product and can be mass-produced in the factory in advance to improve production efficiency and quality.

[0019] 3. The connection nodes and node domains adopt the steel-concrete combined force form, which is beneficial to improve the node performance. At the same time, the grouting holes and grouting pipes ensure the uniformity and density of concrete pouring, reduce the need for secondary repairs, and further reduce construction costs.

[0020] 4. A plurality of column connection nodes connected to the beams are arranged in the middle of the cross-layer concrete columns. This cross-layer prefabrication form reduces the number of connection nodes, which is beneficial to improving the integrity of the structure and the construction efficiency.

[0021] 5. Solved the problems of bolt flange connection at column-column connection node not meeting the bolt margin and spacing requirements, flange easily protruding from the column edge or not meeting the protective layer requirements, affecting the use and durability.

[0022] 6. The connection node area adopts steel structure connection form, which can achieve support-free, reduce wet operations, and help improve on-site construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the structure of the cross-layer concrete column of the present invention; Figure 2 This is a view of the connection structure of the column bottom rectangular steel pipe assembly of the present invention; Figure 3 This is a view of the connection structure of the column top rectangular steel pipe assembly of the present invention; Figure 4 It is a schematic diagram of the connection between the upper and lower columns of the present invention; Figure 5 This is an exploded view of the connection between the upper and lower columns of the present invention; Figure 6 It is a front cross-sectional view of the connection between the upper and lower columns of the present invention; Figure 7 This is an exploded view of the connection between the rectangular steel pipe assembly and the beam in the column of the present invention; Figure 8 is a perspective view of the connection of the rectangular steel pipe assembly in the column of the present invention; Fig. 9 is a perspective view of the connection between the longitudinal reinforcement at the corner of the column and the third rectangular steel pipe of the present invention; Fig.10 is a perspective view of the connection between the longitudinal reinforcement in the middle of the column and the third rectangular steel pipe of the present invention; In the figure: cross-layer concrete column 1; column corner longitudinal reinforcement 101; column middle longitudinal reinforcement 102; stirrups 103; column bottom rectangular steel pipe assembly 2; first rectangular steel pipe 201; groove 202; H-shaped steel 3; column middle rectangular steel pipe assembly 4; lower inner partition 401; web connecting plate 402; third rectangular steel pipe 403; grouting hole 404; upper inner partition 405; inner partition flange 406; column top rectangular steel pipe assembly 5; second rectangular steel pipe 501; lining plate 502; grouting hole 503; grouting pipe 6; outlet pipe 7; flange 8; flange connecting plate 9; inner partition 10. DETAILED DESCRIPTION

[0024] Example 1 like Figures 1 to 10 As shown, an assembled cross-layer concrete column frame connection node structure includes a cross-layer concrete column 1, a column bottom rectangular steel pipe assembly 2 is provided at the bottom of the cross-layer concrete column 1, a column top rectangular steel pipe assembly 5 is provided at the top, and a plurality of column middle rectangular steel pipe assemblies 4 connected to beams are provided in the middle of the cross-layer concrete column 1; The cross-layer concrete column 1 is provided with column middle longitudinal reinforcements 102 on all sides and column corner longitudinal reinforcements 101 at four corners. The column middle longitudinal reinforcements 102 are welded to the outer wall of the first rectangular steel tube 201 in the column bottom rectangular steel tube assembly 2, welded to the outer wall of the second rectangular steel tube 501 in the column top rectangular steel tube assembly 5, and welded to the inner wall of the third rectangular steel tube 403 in the column middle rectangular steel tube assembly 4; The column corner longitudinal reinforcement 101 is welded to the outer wall of the column bottom rectangular steel tube assembly 2 and to the outer wall of the column top rectangular steel tube assembly 5. The column corner longitudinal reinforcement 101 penetrates the column middle rectangular steel tube assembly 4. A web connecting plate 402 is fixedly provided on the side of the rectangular steel pipe assembly 4 in the column opposite to the beam. The end of the beam is an H-shaped steel 3. The web of the H-shaped steel 3 is locked and fixed to the web connecting plate 402 by bolts during installation.

[0025] The connection nodes between the columns of this structure are located at a distance of 1.2m-1.3m from the beam surface or half of the net height of the column, whichever is smaller. This design significantly enhances the integrity and seismic performance of the structure and improves the stability and durability of the structure.

[0026] It is suitable for permanent construction projects that require rapid assembly and are earthquake-resistant, which can significantly reduce on-site operation time and improve construction safety and project quality. In addition, by using prefabricated components, costs can be effectively controlled and material waste can be reduced, which is in line with the development trend of green buildings.

[0027] Preferably, the column bottom rectangular steel pipe assembly 2 includes a first rectangular steel pipe 201 embedded in the bottom of the precast concrete column, and the column top rectangular steel pipe assembly 5 includes a second rectangular steel pipe 501 embedded in the top of the precast concrete column. The first rectangular steel pipe 201 and the second rectangular steel pipe 501 are welded into a rectangle by four steel plates, and the first rectangular steel pipe 201 and the second rectangular steel pipe 501 have the same structure.

[0028] The first rectangular steel tube 201 and the second rectangular steel tube 501 are provided with a plurality of corresponding protruding first flanges 6 on their circumferential sides, and the corresponding flanges 8 are fixed by flange connecting plates 9 and bolts; The first rectangular steel tube 201 and the second rectangular steel tube 501 are overlap-welded with the first column middle longitudinal reinforcement 102 on both sides of the outer walls thereof. The column corner longitudinal reinforcement 101 at the four corners is overlap-welded on one side to the outer side of the first rectangular steel tube 201 and the second rectangular steel tube 501 , and on the other side to the outer wall of the flange 8 .

[0029] A lining plate 502 is fixedly disposed on the inner side of the top of the second rectangular steel tube 501, and the lining plate 502 protrudes from the top of the second rectangular steel tube 501; During installation, the lining plate 502 abuts against the inner wall of the first rectangular steel tube 201; The bottom of the first rectangular steel tube 201 is against the second rectangular steel tube 501 , and each side of the bottom of the first rectangular steel tube 201 is provided with a first groove 202 for welding and fixing with the second rectangular steel tube 501 .

[0030] The first rectangular steel tube 201 and the second rectangular steel tube 501 are both fixed with an inner partition 10, and the cross-layer concrete column 1 is pre-buried with a grouting pipe 6 and an air outlet pipe 7. One end of the grouting pipe 6 and the air outlet pipe 7 is flush with the molding surface of the cross-layer concrete column 1, and the other end is connected to the inner partition 10 in the first upper column steel tube 201; A slurry outlet hole 503 is provided on the outer side of the second rectangular steel tube 501 , and the slurry outlet hole 503 is located on the upper part of the inner partition plate 10 in the second rectangular steel tube 501 .

[0031] When the upper and lower columns are butted, the column bottom rectangular steel pipe assembly 2 and the column top rectangular steel pipe assembly 5 are realized. During the installation process, the bottom of the first rectangular steel pipe 201 is against the second rectangular steel pipe 501, and the upper and lower flanges 8 are connected and locked through the flange connecting plate 9 to ensure the verticality of the column, and then fixed by groove welding. The grouting pipe 6 and the air outlet pipe 7 ensure the discharge of gas and the uniform filling of materials during concrete pouring, which not only improves the construction efficiency and safety of prefabricated buildings, but also enhances the stability of the overall structure. Through detailed prefabrication and precise on-site installation, the construction time and cost can be significantly reduced, while ensuring the quality of the project.

[0032] Preferably, the rectangular steel pipe assembly 4 in the column includes a third rectangular steel pipe 403 prefabricated in the cross-layer concrete column 1, an upper inner partition 405 and a lower inner partition 401 are fixedly arranged in the third rectangular steel pipe 403, and arc through holes are arranged between the four corners of the upper inner partition 405 and the lower inner partition 401 and the rectangular steel pipe 403; The inner wall circumference of both ends of the third rectangular steel tube 403 is welded with the column middle longitudinal reinforcement 102, the column middle longitudinal reinforcement 102 between the upper and lower column middle rectangular steel tube assemblies 4 is connected and fixed by bending or staggered overlap, the column middle longitudinal reinforcement 102 between the column middle rectangular steel tube assembly 4 and the column bottom rectangular steel tube assembly 2 or the column top rectangular steel tube assembly 5 is the same longitudinal reinforcement, which is respectively welded to the third rectangular steel tube 4 and the first rectangular steel tube 201 or the second rectangular steel tube 501 in the column; The column corner longitudinal reinforcements 101 at the four corners penetrate the rectangular steel tube assembly 4 in the column, and are located in the arc through holes; the column corner longitudinal reinforcements 101 at the four corners are overlap-welded with the outer walls of the first rectangular steel tube 201 and the second rectangular steel tube 501.

[0033] The web connecting plate 402 is welded to the third rectangular steel tube 403 , the web of the H-shaped steel 3 at the end of the beam is welded or bolted to the web connecting plate 402 , and the upper and lower flange ends are welded to the outer wall of the third rectangular steel tube 403 .

[0034] The third rectangular steel tube 403 is provided with a grouting hole 404 on its circumference, and the grouting hole 404 is provided between the upper inner partition plate 405 and the lower inner partition plate 401; The upper inner partition 405 and the lower inner partition 401 are provided with protruding inner partition flanges 406 , which extend to the outer wall of the rectangular steel tube 403 , and the upper and lower flanges of the H-shaped steel 3 at the end of the beam are welded and fixed to the inner partition flanges 406 .

[0035] The longitudinal reinforcement in the middle of the column between the rectangular steel tube assemblies 4 in the upper and lower columns is connected and fixed by bending or staggered overlap to ensure the continuity and strength of the structure. The longitudinal reinforcement at the corner of the column runs through the third rectangular steel tube 403 and is positioned by circular arc through holes to ensure the accurate position of the steel bars and the stability of the structure. The web connecting plate 402 is fixed to the web of the H-shaped steel 3 by bolts or welding, and the upper and lower flanges of the H-shaped steel are welded to the outer wall of the third rectangular steel tube 403 or the inner partition flange 406 to ensure a firm connection between the beam and the column. Concrete is injected into the third rectangular steel tube 403 through the grouting holes to ensure the integrity and durability of the structure.

[0036] It improves the construction efficiency and safety of prefabricated buildings, and is particularly suitable for medium and high-rise building projects that require high seismic performance and rapid construction. Through precise prefabrication and efficient on-site installation, construction time and costs can be significantly reduced while ensuring project quality.

[0037] Example 2 like Figures 1 to 10 As shown, in combination with Example 1, a construction method of an assembled cross-layer concrete column frame connection node structure is further described, and the method steps are as follows: S1, the cross-layer concrete column 1 is prefabricated in the factory, the column bottom rectangular steel pipe assembly 2, the column middle rectangular steel pipe assembly 4 and the column top rectangular steel pipe assembly 5 are first assembled and formed, and the two ends of the column middle rectangular steel pipe assembly 4 are welded to the column middle longitudinal reinforcement 102 and tied with stirrups 103 according to the designed floor height; Then, the rectangular steel tube components 4 in the columns of each layer are placed in place and the column middle longitudinal reinforcements 102 between the rectangular steel tube components 4 in each column are overlapped, and the column corner longitudinal reinforcements 101 are passed through the rectangular steel tube components 4 in each column; Then, the column bottom rectangular steel pipe assembly 2 and the column top rectangular steel pipe assembly 5 are placed in place and connected with the column corner longitudinal reinforcement 101 and the column middle longitudinal reinforcement 102 by lap welding; Finally, the formwork is supported and the inner part of the rectangular steel pipe component 4 in the column and the outer protective layer of the rectangular steel pipe 403 are integrally cast to form a cross-layer concrete column 1; S2. During installation, the upper cross-layer concrete column 1 is hoisted so that the upper column bottom rectangular steel pipe assembly 2 is butted with the lower column top rectangular steel pipe assembly 5, and then the flange connecting plate 9 is installed and positioned and locked, and then the upper column first rectangular steel pipe 201 and the lower column second rectangular steel pipe 501 are welded and fixed, and then the flange connecting plate 9 is removed, and finally the unwelded parts are fully penetrated and welded; S3, installation of the beam, the web connecting plate 402 is welded to the third rectangular steel tube 403, the web of the H-shaped steel 3 at the end of the beam is welded or bolted to the web connecting plate 402, and the upper and lower flanges of the H-shaped steel 3 are welded to the inner diaphragm flange 406 or the third rectangular steel tube 403; S4. Finally, fill the exposed areas of the column-to-column connection nodes and the cross-layer beam-column connection nodes with concrete or grouting material to form a node protection layer.

[0038] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An assembled cross-layer concrete column frame connection node structure, characterized by: It comprises a cross-layer concrete column (1), wherein a column bottom rectangular steel pipe assembly (2) is provided at the bottom of the cross-layer concrete column (1), a column top rectangular steel pipe assembly (5) is provided at the top, and a plurality of column middle rectangular steel pipe assemblies (4) connected to beams are provided in the middle of the cross-layer concrete column (1); The cross-layer concrete column (1) is provided with column middle longitudinal reinforcements (102) at four sides and column corner longitudinal reinforcements (101) at four corners. The column middle longitudinal reinforcements (102) are welded to the outer wall of the first rectangular steel tube (201) in the column bottom rectangular steel tube assembly (2), welded to the outer wall of the second rectangular steel tube (501) in the column top rectangular steel tube assembly (5), and welded to the inner wall of the third rectangular steel tube (403) in the column middle rectangular steel tube assembly (4); The column corner longitudinal reinforcement (101) is welded to the outer wall of the column bottom rectangular steel tube assembly (2), and is welded to the outer wall of the column top rectangular steel tube assembly (5), and the column corner longitudinal reinforcement (101) passes through the column middle rectangular steel tube assembly (4); A web connecting plate (402) is fixedly provided on the side of the rectangular steel pipe assembly (4) in the column opposite to the beam, and the end of the beam is an H-shaped steel (3). When the web of the H-shaped steel (3) is installed, it is locked and fixed with the web connecting plate (402) by bolts.

2. According to claim 1, the assembled cross-layer concrete column frame connection node structure is characterized by: The column bottom rectangular steel pipe assembly (2) comprises a first rectangular steel pipe (201) pre-buried in the bottom of the precast concrete column, and the column top rectangular steel pipe assembly (5) comprises a second rectangular steel pipe (501) pre-buried in the top of the precast concrete column. The first rectangular steel pipe (201) and the second rectangular steel pipe (501) are welded from four steel plates to form a rectangle, and the first rectangular steel pipe (201) and the second rectangular steel pipe (501) have the same structure.

3. According to claim 2, the assembled cross-layer concrete column frame connection node structure is characterized by: A plurality of correspondingly protruding first flanges (6) are provided on the circumference of the first rectangular steel tube (201) and the second rectangular steel tube (501), and the corresponding flanges (8) are fixed by flange connecting plates (9) and bolts; The first rectangular steel tube (201) and the second rectangular steel tube (501) are overlap-welded with first column middle longitudinal reinforcements (102) on both sides of the outer walls thereof; the column corner longitudinal reinforcements (101) at the four corners are overlap-welded on one side to the outer sides of the first rectangular steel tube (201) and the second rectangular steel tube (501) and on the other side to the outer wall of the flange (8).

4. According to claim 3, the assembled cross-layer concrete column frame connection node structure is characterized by: A lining plate (502) is fixedly provided on the inner side of the top of the second rectangular steel tube (501), and the lining plate (502) protrudes from the top of the second rectangular steel tube (501); During installation, the lining plate (502) abuts against the inner wall of the first rectangular steel tube (201); The bottom of the first rectangular steel tube (201) is against the second rectangular steel tube (501), and each side of the bottom of the first rectangular steel tube (201) is provided with a first groove (202) for welding and fixing with the second rectangular steel tube (501).

5. According to claim 2, the assembled cross-layer concrete column frame connection node structure is characterized by: An inner partition plate (10) is fixedly provided in the first rectangular steel tube (201) and the second rectangular steel tube (501); a grouting pipe (6) and an air outlet pipe (7) are pre-buried in the cross-layer concrete column (1); one end of the grouting pipe (6) and the air outlet pipe (7) is flush with the molding surface of the cross-layer concrete column (1), and the other end is connected to the inner partition plate (10) in the first upper column steel tube (201); A slurry outlet hole (503) is provided on the outside of the second rectangular steel tube (501), and the slurry outlet hole (503) is located on the upper part of the inner partition plate (10) inside the second rectangular steel tube (501).

6. The assembled cross-layer concrete column frame connection node structure according to claim 1 is characterized by: The column rectangular steel tube assembly (4) comprises a third rectangular steel tube (403) prefabricated in the cross-layer concrete column (1), an upper inner partition (405) and a lower inner partition (401) are fixedly arranged in the third rectangular steel tube (403), and arc through holes are arranged between the four corners of the upper inner partition (405) and the lower inner partition (401) and the rectangular steel tube (403); The inner wall circumferences of both ends of the third rectangular steel tube (403) are welded with column middle longitudinal reinforcements (102); the column middle longitudinal reinforcements (102) between the upper and lower column middle rectangular steel tube assemblies (4) are connected and fixed by bending or staggered overlap; the column middle longitudinal reinforcements (102) between the column middle rectangular steel tube assembly (4) and the column bottom rectangular steel tube assembly (2) or the column top rectangular steel tube assembly (5) are the same longitudinal reinforcement, which is respectively welded to the third column middle rectangular steel tube (4) and the first rectangular steel tube (201) or the second rectangular steel tube (501); The column corner longitudinal reinforcements (101) at the four corners penetrate the rectangular steel pipe assembly (4) in the column, and the column corner longitudinal reinforcements (101) are located in the circular arc through holes; the column corner longitudinal reinforcements (101) at the four corners are overlap-welded with the outer walls of the first rectangular steel pipe (201) and the second rectangular steel pipe (501).

7. The assembled cross-layer concrete column frame connection node structure according to claim 1 is characterized by: The web connecting plate (402) is welded to the third rectangular steel tube (403), the web in the H-shaped steel (3) at the end of the beam is welded or bolted to the web connecting plate (402), and the ends of the upper and lower flanges are welded to the outer wall of the third rectangular steel tube (403).

8. The assembled cross-layer concrete column frame connection node structure according to claim 6 is characterized by: The third rectangular steel tube (403) is provided with grouting holes (404) on its circumference, and the grouting holes (404) are provided between the upper inner baffle (405) and the lower inner baffle (401); The upper inner baffle (405) and the lower inner baffle (401) are provided with protruding inner baffle flanges (406) on their circumferential sides. The inner baffle flanges (406) extend to the outer wall of the rectangular steel tube (403). The upper and lower flanges of the H-shaped steel (3) at the end of the beam are welded and fixed to the inner baffle flanges (406).

9. A construction method for an assembled cross-layer concrete column frame connection node structure according to any one of claims 1 to 8, wherein the method steps are as follows: S1, the cross-story concrete column (1) is prefabricated in a factory, the column bottom rectangular steel pipe assembly (2), the column middle rectangular steel pipe assembly (4) and the column top rectangular steel pipe assembly (5) are first assembled and formed, and the two ends of the column middle rectangular steel pipe assembly (4) are welded with the column middle longitudinal reinforcement (102) and tied with stirrups (103) according to the designed floor height; Then, the rectangular steel tube assemblies (4) in the columns of each layer are placed in place and the column middle longitudinal reinforcements (102) between the rectangular steel tube assemblies (4) in each column are overlapped, and the column corner longitudinal reinforcements (101) are passed through the rectangular steel tube assemblies (4) in each column; Then, the column bottom rectangular steel tube assembly (2) and the column top rectangular steel tube assembly (5) are placed in place and connected to the column corner longitudinal reinforcement (101) and the column middle longitudinal reinforcement (102) by lap welding; Finally, the formwork is supported and the interior of the rectangular steel pipe assembly (4) in the column and the outer protective layer of the rectangular steel pipe (403) are integrally cast to form a cross-layer concrete column (1); S2. During installation, the upper cross-layer concrete column (1) is hoisted so that the upper column bottom rectangular steel pipe assembly (2) is butted against the lower column top rectangular steel pipe assembly (5), and then the flange connection plate (9) is installed and positioned and locked, and then the upper column first rectangular steel pipe (201) and the lower column second rectangular steel pipe (501) are welded and fixed, and then the flange connection plate (9) is removed, and finally the unwelded parts are fully penetrated and welded; S3, installation of the beam, the web connecting plate (402) is welded to the third rectangular steel tube (403), the web of the H-shaped steel (3) at the end of the beam is welded or bolted to the web connecting plate (402), and the upper and lower flanges of the H-shaped steel (3) are welded to the inner diaphragm flange (406) or the third rectangular steel tube (403); S4. Finally, fill the exposed areas of the column-to-column connection nodes and the cross-layer beam-column connection nodes with concrete or grouting material to form a node protection layer.

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