A construction method for a prefabricated multi-story concrete column frame connection node

Abstract

This invention provides a prefabricated multi-story concrete column frame connection node structure and construction method, including multi-story concrete columns, column-to-column connection nodes at the ends of the multi-story concrete columns, and multiple multi-story beam-to-column connection nodes connected to beams in the middle of the multi-story concrete columns. Both the column-to-column connection nodes and the beam-to-column connection nodes adopt the form of rectangular steel tube concrete assembly. The distance between the column-to-column connection node and the beam surface is 1.2~1.3m or half the net height of the column, whichever is smaller. The longitudinal reinforcement of the column is welded to the outer wall of the rectangular steel tube assembly. The multi-story beam-to-column connection node includes a node area, with the longitudinal reinforcement in the middle part of the column welded to the inner wall of the rectangular steel tube assembly, and the corner longitudinal reinforcement and the longitudinal reinforcement near the corners penetrating the rectangular steel tube assembly to connect the upper and lower story columns. The rectangular steel tube components for column-to-column and beam-to-column connection nodes can be standardized products and mass-produced in the factory in advance, improving production efficiency and quality. The steel-concrete composite stress form at the connection node position is conducive to improving node performance. The multi-story prefabrication form reduces the number of connection nodes and is conducive to improving the overall structure. The steel structure connection form at the connection node position can realize support-free construction, which is conducive to improving on-site construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of prefabricated buildings, and specifically to a prefabricated multi-story concrete column frame connection node structure and construction method. Background Technology

[0002] Prefabricated multi-story columns can reduce the number of formwork units produced in the factory, reduce the number of column-to-column splicing joints on the construction site, and improve the overall integrity of the structure. With the improvement of industrialization level and transportation and hoisting capabilities, the use of large-span prefabricated components is increasing.

[0003] In current technology, the longitudinal reinforcement of columns is lapped and welded to the outer wall of the steel pipe. Due to the diameter of the reinforcement and stirrups themselves, plus the required protective layer, the cross-section of the steel pipe is significantly weakened. Furthermore, the connection joint is a pure steel structure, increasing the thickness of the rectangular steel pipe, i.e., the amount of steel used. When the longitudinal reinforcement at the column corner is welded to the corner of the rectangular steel pipe, the weld seams on both sides of the reinforcement are under close stress. Moreover, when the rectangular steel pipe is formed by welding steel plates, the weld seams overlap, adversely affecting the welding quality between the longitudinal reinforcement and the steel pipe. Welding all the longitudinal reinforcement of the column to the steel pipe wall is extremely labor-intensive and easily causes stress concentration in the steel pipe wall, adversely affecting the performance of the rectangular steel pipe. At the nodes between upper and lower layers, the rectangular steel pipes are welded together by the longitudinal reinforcement, and the stress generated during welding is not easily released, affecting the performance of the longitudinal reinforcement.

[0004] Meanwhile, the bolt flange connection at the bottom of the cross-story column has issues such as flanges protruding from the column edge or failing to meet the protective layer requirements in order to meet the bolt edge distance and spacing requirements, which affects the use and durability.

[0005] Currently, column longitudinal reinforcement is welded to the outside of the steel pipe. This has several drawbacks: First, it is difficult to determine the dimensions before design, making it difficult to mass-produce rectangular steel pipe components in a standardized manner in the factory. Second, the different stresses of each building structure determine the different specifications of the column longitudinal reinforcement, making it difficult to weld the column longitudinal reinforcement to the steel connectors in advance, which greatly affects the later production and processing schedule and delivery cycle. Third, the beam-column connection node cannot be cast in the factory with the precast column at the same time, but can only be cast twice on the construction site, increasing the construction cycle and labor costs.

[0006] Therefore, how to reduce steel consumption and improve production and construction efficiency, while solving the problems of unreasonable structure and stress, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] The main objective of this invention is to provide a construction method and structure for a prefabricated multi-story concrete column frame connection node, thereby solving the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: it includes a multi-story concrete column, a column bottom rectangular steel pipe assembly is provided at the bottom of the multi-story 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 beams are provided in the middle of the multi-story concrete column.

[0009] The cross-story concrete column is equipped with longitudinal reinforcement bars in the middle of the column and longitudinal reinforcement bars at the corners of the column. The longitudinal reinforcement bars in the middle of the column are welded to the outer wall of the first rectangular steel pipe in the rectangular steel pipe assembly at the bottom of the column, welded to the outer wall of the second rectangular steel pipe in the rectangular steel pipe assembly at the top of the column, and welded to the inner wall of the third rectangular steel pipe in the rectangular steel pipe assembly in the middle of the column.

[0010] 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 passes through the rectangular steel pipe assembly in the middle of the column.

[0011] A web connecting plate is fixed on the rectangular steel tube assembly in the column on the side opposite to the beam. The beam end is an H-beam. The web of the H-beam is locked and fixed to the web connecting plate with bolts during installation.

[0012] Preferably, the column base 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 and second rectangular steel pipes are welded from four steel plates into a rectangle, and the first and second rectangular steel pipes have the same structure.

[0013] Preferably, the first rectangular steel pipe and the second rectangular steel pipe are provided with a plurality of corresponding protruding first flanges on their periphery, and the corresponding flanges are locked and fixed together by flange connecting plates and bolts;

[0014] The first rectangular steel pipe and the second rectangular steel pipe have double-sided lap welded longitudinal reinforcement bars in the middle of the first column on their outer walls. The corner longitudinal reinforcement bars of the four corners are lap welded on one side to the outside of the first rectangular steel pipe and the second rectangular steel pipe, and on the other side to the outer wall of the flange.

[0015] Preferably, a liner is fixed to the inner side of the top of the second rectangular steel pipe, and the liner protrudes from the top of the second rectangular steel pipe;

[0016] During installation, the liner plate rests against the inner wall of the first rectangular steel pipe;

[0017] The bottom of the first rectangular steel pipe abuts against the second rectangular steel pipe. Each side of the bottom of the first rectangular steel pipe is provided with a first bevel for welding and fixing with the second rectangular steel pipe.

[0018] Preferably, both the first rectangular steel pipe and the second rectangular steel pipe are fixed with internal partitions, and the cross-layer concrete column is pre-embedded with grouting pipes and vent pipes. One end of the grouting pipe and the vent pipe is flush with the forming surface of the cross-layer concrete column, and the other end is connected to the internal partition in the first upper column steel pipe.

[0019] The second rectangular steel pipe has a slurry outlet on its outer side, which is located above the inner partition plate inside the second rectangular steel pipe.

[0020] Preferably, the rectangular steel tube assembly in the column includes a third rectangular steel tube prefabricated in the cross-story concrete column, and an upper inner partition and a lower inner partition are fixed inside the third rectangular steel tube. The four corners of the upper inner partition and the lower inner partition are provided with arc-shaped through holes between them and the rectangular steel tube.

[0021] The inner walls of the two ends of the third rectangular steel pipe are welded with column mid-longitudinal reinforcement. The column mid-longitudinal reinforcement between the upper and lower column mid-longitudinal steel pipe assemblies is connected and fixed by bending or staggered lap splicing. The column mid-longitudinal reinforcement between the column mid-longitudinal steel pipe assembly and the column bottom rectangular steel pipe assembly or the column top rectangular steel pipe assembly is the same longitudinal reinforcement, which is welded to the third rectangular steel pipe and the first rectangular steel pipe or the second rectangular steel pipe in the column respectively.

[0022] The longitudinal reinforcement at the four corners of the column penetrates the rectangular steel pipe assembly in the column, and the longitudinal reinforcement at the corners of the column is located inside the arc-shaped through hole; the longitudinal reinforcement at the four corners of the column is lapped and welded to the outer wall of the first rectangular steel pipe and the second rectangular steel pipe.

[0023] Preferably, the web connecting plate is welded to the third rectangular steel pipe, the web of the H-beam at the beam end is welded or bolted to the web connecting plate, and the ends of the upper and lower flanges are welded to the outer wall of the third rectangular steel pipe.

[0024] Preferably, the third rectangular steel pipe is provided with grouting holes on its periphery, and the grouting holes are located between the upper inner partition and the lower inner partition;

[0025] The upper and lower inner partitions are provided with protruding inner partition flanges on their periphery. The inner partition flanges extend to the outer wall of the rectangular steel tube. The upper and lower flanges of the H-beam at the end of the beam are welded and fixed to the inner partition flanges.

[0026] A construction method for a prefabricated multi-story concrete column frame connection node is provided, and the method steps are as follows:

[0027] S1. The multi-story concrete columns are prefabricated in the factory. The rectangular steel tube components at the bottom of the column, the rectangular steel tube components in the middle of the column, and the rectangular steel tube components at the top of the column are assembled first. The longitudinal reinforcement bars in the middle of the column are welded to both ends of the rectangular steel tube components in the middle of the column according to the design floor height and the stirrups are tied.

[0028] Then, the rectangular steel pipe assemblies in the columns of each floor are placed in place and the longitudinal reinforcement in the middle of the column is lapped between the rectangular steel pipe assemblies in the columns. The longitudinal reinforcement at the corner of the column is passed through the rectangular steel pipe assemblies in the columns.

[0029] 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 lap-welded to the longitudinal reinforcement at the corners of the column and the longitudinal reinforcement in the middle of the column.

[0030] Finally, the formwork was erected and the rectangular steel pipe components inside the column and the outer protective layer of the rectangular steel pipe were poured together to form a multi-story concrete column.

[0031] S2. During installation, hoist the upper section of the cross-story concrete column so that the rectangular steel pipe assembly at the bottom of the upper section column is connected to the rectangular steel pipe assembly at the top of the lower section column. Then, install the flange connecting plate and lock it in place. Next, weld and fix the first rectangular steel pipe of the upper section column to the second rectangular steel pipe of the lower section column. Then, remove the flange connecting plate and finally fully weld the unwelded parts.

[0032] S3. For beam installation, the web connecting plate is welded to the third rectangular steel pipe, and the web of the H-beam at the beam end is welded or bolted to the web connecting plate. The upper and lower flanges of the H-beam are welded to the inner diaphragm flange or the third rectangular steel pipe.

[0033] S4. Finally, the exposed areas of the column-to-column connection nodes and cross-story beam-column connection nodes are filled with concrete or grout to form a protective layer for the nodes.

[0034] This invention provides a construction method and structure for a prefabricated multi-story concrete column frame connection node, with the following advantages:

[0035] 1. The distance between the column-to-column connection nodes and the beam surface is 1.2m-1.3m or half 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.

[0036] 2. The cross-story beam-column connection node includes the node area. 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 near the corner passes through the rectangular steel pipe to connect the upper and lower columns. This can form a standardized product and be mass-produced in the factory in advance to improve production efficiency and quality.

[0037] 3. The connection nodes, including the node domain, adopt a steel-concrete composite stress form, which is beneficial to improve the performance of the nodes. At the same time, the grouting holes and grouting pipes ensure the uniformity and density of the concrete pouring, reduce the need for secondary repairs, and further reduce construction costs.

[0038] 4. Multiple column connection nodes that connect to beams are provided in the middle of the cross-story concrete columns. This cross-story prefabrication method reduces the number of connection nodes, which helps to improve the integrity of the structure and construction efficiency.

[0039] 5. Solved the problems of bolt flange connections at column-to-column joints, where flanges easily protruded from the column edge or failed to meet the protective layer requirements in order to meet the bolt edge and spacing requirements, thus affecting use and durability.

[0040] 6. The connection nodes adopt a steel structure connection, which can eliminate the need for supports, reduce wet work, and improve on-site construction efficiency. Attached Figure Description

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0042] Figure 1 This is a schematic diagram of the cross-story concrete column structure of the present invention;

[0043] Figure 2 This is a view of the connection structure of the rectangular steel tube assembly at the column base of the present invention;

[0044] Figure 3 This is a view of the connection structure of the rectangular steel pipe assembly at the top of the column in this invention;

[0045] Figure 4 This is a schematic diagram of the connection between the upper and lower columns of the present invention;

[0046] Figure 5 This is an exploded view of the connection between the upper and lower columns of the present invention;

[0047] Figure 6 This is a front sectional view of the connection between the upper and lower columns of the present invention;

[0048] Figure 7 This is an exploded view of the connection between the rectangular steel pipe assembly in the column and the beam of the present invention;

[0049] Figure 8 This is a perspective view of the rectangular steel pipe assembly connection in the column of the present invention;

[0050] Figure 9 This is a perspective view of the connection between the longitudinal reinforcement at the column corner and the third rectangular steel pipe of the present invention;

[0051] Figure 10 This is a perspective view of the connection between the longitudinal reinforcement in the middle of the column and the third rectangular steel pipe in this invention;

[0052] In the diagram: 1. Concrete column spanning multiple floors; 101. Longitudinal reinforcement at the column corner; 102. Longitudinal reinforcement in the middle of the column; 103. Rectangular steel pipe assembly at the bottom of the column; 2. First rectangular steel pipe; 201. Bevel; 202. H-beam; 3. Rectangular steel pipe assembly in the middle of the column; 4. Lower inner diaphragm; 401. Web connecting plate; 402. Third rectangular steel pipe; 403. Grouting hole; 404. Upper inner diaphragm; 405. Inner diaphragm flange; 406. Rectangular steel pipe assembly at the top of the column; 5. Second rectangular steel pipe; 501. Liner; 502. Grouting hole; 503. Grouting pipe; 6. Vent pipe; 7. Flange; 8. Flange connecting plate; 9. Inner diaphragm; 10. Detailed Implementation

[0053] Example 1

[0054] like Figures 1-10As shown, a prefabricated multi-story concrete column frame connection node structure includes a multi-story concrete column 1, a column bottom rectangular steel pipe assembly 2 at the bottom of the multi-story concrete column 1, a column top rectangular steel pipe assembly 5 at the top, and multiple column middle rectangular steel pipe assemblies 4 connected to beams in the middle of the multi-story concrete column 1.

[0055] The cross-story concrete column 1 is provided with longitudinal reinforcement 102 in the middle of the column and longitudinal reinforcement 101 at the corner of the column. The longitudinal reinforcement 102 in the middle of the column is welded to the outer wall of the first rectangular steel pipe 201 in the rectangular steel pipe assembly 2 at the bottom of the column, welded to the outer wall of the second rectangular steel pipe 501 in the rectangular steel pipe assembly 5 at the top of the column, and welded to the inner wall of the third rectangular steel pipe 403 in the rectangular steel pipe assembly 4 in the middle of the column.

[0056] The longitudinal reinforcement 101 at the column corner is welded to the outer wall of the rectangular steel pipe assembly 2 at the bottom of the column and to the outer wall of the rectangular steel pipe assembly 5 at the top of the column. The longitudinal reinforcement 101 at the column corner passes through the rectangular steel pipe assembly 4 in the middle of the column.

[0057] A web plate connecting plate 402 is fixed on the rectangular steel pipe assembly 4 in the column on the side opposite to the beam. The beam end is an H-beam 3. When the web of the H-beam 3 is installed, it is locked and fixed to the web plate connecting plate 402 by bolts.

[0058] The connection nodes between the columns in this structure are selected from the smaller of a distance of 1.2m-1.3m from the beam surface or half the net height of the column. This design significantly enhances the integrity and seismic performance of the structure, and improves its stability and durability.

[0059] Suitable for permanent building projects requiring rapid assembly and earthquake resistance, prefabricated components can significantly reduce on-site work time and improve construction safety and project quality. Furthermore, the use of prefabricated components effectively controls costs, reduces material waste, and aligns with the trend towards green building.

[0060] Preferably, the column base rectangular steel pipe assembly 2 includes a first rectangular steel pipe 201 pre-embedded at the bottom of the precast concrete column, and the column top rectangular steel pipe assembly 5 includes a second rectangular steel pipe 501 pre-embedded at 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 into a rectangle, and the first rectangular steel pipe 201 and the second rectangular steel pipe 501 have the same structure.

[0061] The first rectangular steel pipe 201 and the second rectangular steel pipe 501 are provided with a plurality of corresponding protruding first flanges 6 on their periphery, and the corresponding flanges 8 are locked and fixed together by flange connecting plates 9 and bolts.

[0062] The first rectangular steel pipe 201 and the second rectangular steel pipe 501 are lap-welded on both sides of their outer walls. The first column middle longitudinal reinforcement 102 is lap-welded on one side of the four corner longitudinal reinforcements 101 on the outside of the first rectangular steel pipe 201 and the second rectangular steel pipe 501, and lap-welded on the outer wall of the flange 8 on the other side.

[0063] A liner 502 is fixedly provided on the inner side of the top of the second rectangular steel pipe 501, and the liner 502 protrudes from the top of the second rectangular steel pipe 501;

[0064] During installation, the liner 502 abuts against the inner wall of the first rectangular steel pipe 201;

[0065] The bottom of the first rectangular steel pipe 201 abuts against the second rectangular steel pipe 501. Each side of the bottom of the first rectangular steel pipe 201 is provided with a first bevel 202 for welding and fixing with the second rectangular steel pipe 501.

[0066] Both the first rectangular steel pipe 201 and the second rectangular steel pipe 501 are fixed with inner partitions 10. The cross-layer concrete column 1 is pre-embedded with grouting pipes 6 and vent pipes 7. One end of the grouting pipes 6 and vent pipes 7 is flush with the forming 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 pipe 201.

[0067] The second rectangular steel pipe 501 has a slurry outlet 503 on its outer side, which is located on the upper part of the inner partition 10 inside the second rectangular steel pipe 501.

[0068] When the upper and lower columns are joined, the rectangular steel pipe assembly 2 at the bottom of the column and the rectangular steel pipe assembly 5 at the top of the column are connected. During installation, the bottom of the first rectangular steel pipe 201 abuts 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. Then, it is fixed by bevel welding. The grouting pipe 6 and the vent pipe 7 ensure the discharge of gas and the uniform filling of materials during concrete pouring. This 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, construction time and costs can be significantly reduced while ensuring project quality.

[0069] Preferably, the rectangular steel tube assembly 4 in the column includes a third rectangular steel tube 403 prefabricated in the cross-story concrete column 1. An upper inner partition 405 and a lower inner partition 401 are fixed inside the third rectangular steel tube 403. Arc-shaped through holes are provided between the four corners of the upper inner partition 405 and the lower inner partition 401 and the rectangular steel tube 403.

[0070] The inner walls of the third rectangular steel pipe 403 at both ends are welded with column mid-length reinforcement 102. The column mid-length reinforcement 102 between the upper and lower column mid-length steel pipe assemblies 4 are connected and fixed by bending or staggered lap splicing. The column mid-length reinforcement 102 between the column mid-length steel pipe assembly 4 and the column bottom rectangular steel pipe assembly 2 or the column top rectangular steel pipe assembly 5 is the same longitudinal reinforcement, which is welded to the third rectangular steel pipe 4 and the first rectangular steel pipe 201 or the second rectangular steel pipe 501 respectively.

[0071] The corner longitudinal ribs 101 of the four corners of the column pass through the rectangular steel pipe assembly 4 in the column, and the corner longitudinal ribs 101 are located in the arc-shaped through hole; the corner longitudinal ribs 101 of the four corners of the column are lapped and welded to the outer wall of the first rectangular steel pipe 201 and the second rectangular steel pipe 501.

[0072] The web plate connecting plate 402 is welded to the third rectangular steel pipe 403. The web of the H-beam 3 at the end of the beam is welded or bolted to the web plate connecting plate 402, and the ends of the upper and lower flanges are welded to the outer wall of the third rectangular steel pipe 403.

[0073] The third rectangular steel pipe 403 is provided with grouting holes 404 on its periphery, and the grouting holes 404 are located between the upper inner partition 405 and the lower inner partition 401.

[0074] The upper inner partition 405 and the lower inner partition 401 are provided with protruding inner partition flanges 406 on their periphery. The inner partition flanges 406 extend to the outer wall of the rectangular steel pipe 403. The upper and lower flanges of the H-beam 3 at the end of the beam are welded and fixed to the inner partition flanges 406.

[0075] The longitudinal reinforcement bars at the midpoint of the rectangular steel tube assemblies 4 in the upper and lower columns are connected and fixed by bending or staggered lap splicing to ensure the continuity and strength of the structure. The longitudinal reinforcement bars at the column corners penetrate the third rectangular steel tube 403 and are positioned through arc-shaped through holes to ensure accurate placement of the reinforcement bars and structural stability. The web connecting plate 402 is fixed to the web of the H-beam 3 by bolts or welding. Simultaneously, the upper and lower flanges of the H-beam are welded to the outer wall or inner diaphragm flange 406 of the third rectangular steel tube 403 to ensure a firm connection between the beam and column. Concrete is injected into the third rectangular steel tube 403 through grouting holes to ensure the integrity and durability of the structure.

[0076] This improves the construction efficiency and safety of prefabricated buildings, making them particularly suitable for mid- to high-rise building projects requiring 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.

[0077] Example 2

[0078] like Figures 1-10 As shown in Example 1, a construction method for a prefabricated multi-story concrete column frame connection node structure is further illustrated, and the method steps are as follows:

[0079] S1. The cross-story concrete column 1 is prefabricated in the factory. The column base 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. The column middle rectangular steel pipe assembly 4 is welded with the column middle longitudinal reinforcement 102 at both ends according to the designed floor height and tied with the stirrup 103.

[0080] Then, the rectangular steel pipe assembly 4 in each column is placed in place and the longitudinal reinforcement 102 in the middle of the column is lapped between the rectangular steel pipe assemblies 4 in each column. The longitudinal reinforcement 101 at the corner of the column is passed through the rectangular steel pipe assembly 4 in each column.

[0081] Then, the column base rectangular steel pipe assembly 2 and the column top rectangular steel pipe assembly 5 are placed in place and lap-welded to the column corner longitudinal reinforcement 101 and the column middle longitudinal reinforcement 102.

[0082] Finally, the formwork was erected and the rectangular steel pipe assembly 4 in the column and the outer protective layer of the rectangular steel pipe 403 were poured together to form a multi-story concrete column 1.

[0083] S2. During installation, hoist the upper section of the cross-story concrete column 1 so that the rectangular steel pipe assembly 2 at the bottom of the upper section column is connected to the rectangular steel pipe assembly 5 at the top of the lower section column. Then, install the flange connecting plate 9 and lock it in place. Then, weld and fix the first rectangular steel pipe 201 of the upper section column to the second rectangular steel pipe 501 of the lower section column. Then, remove the flange connecting plate 9. Finally, fully weld the unwelded parts.

[0084] S3. For beam installation, the web plate connecting plate 402 is welded to the third rectangular steel pipe 403. The web of the H-beam 3 at the beam end is welded or bolted to the web plate connecting plate 402. The upper and lower flanges of the H-beam 3 are welded to the inner diaphragm flange 406 or the third rectangular steel pipe 403.

[0085] S4. Finally, the exposed areas of the column-to-column connection nodes and cross-story beam-column connection nodes are filled with concrete or grout to form a protective layer for the nodes.

[0086] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A prefabricated multi-story concrete column frame connection node structure, characterized in that: It includes a cross-story concrete column (1), a column bottom rectangular steel pipe assembly (2) at the bottom of the cross-story concrete column (1), a column top rectangular steel pipe assembly (5) at the top, and multiple column middle rectangular steel pipe assemblies (4) connected to beams in the middle of the cross-story concrete column (1). The cross-story concrete column (1) is provided with longitudinal reinforcement bars (102) in the middle of the column and longitudinal reinforcement bars (101) at the corners of the column. The longitudinal reinforcement bars (102) in the middle of the column are welded to the outer wall of the first rectangular steel pipe (201) in the rectangular steel pipe assembly (2) at the bottom of the column, welded to the outer wall of the second rectangular steel pipe (501) in the rectangular steel pipe assembly (5) at the top of the column, and welded to the inner wall of the third rectangular steel pipe (403) in the rectangular steel pipe assembly (4) in the middle of the column. The column corner longitudinal reinforcement (101) is welded to the outer wall of the column bottom rectangular steel pipe assembly (2) and to the outer wall of the column top rectangular steel pipe assembly (5). The column corner longitudinal reinforcement (101) passes through the column middle rectangular steel pipe assembly (4). A web plate connecting plate (402) is fixed on the rectangular steel pipe assembly (4) in the column on the side opposite to the beam. The beam end is an H-beam (3). When the web of the H-beam (3) is installed, it is locked and fixed to the web plate connecting plate (402) by bolts.

2. The prefabricated multi-story concrete column frame connection node structure according to claim 1, characterized in that: The column base 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. The first rectangular steel pipe (201) and the second rectangular steel pipe (501) have the same structure.

3. The prefabricated multi-story concrete column frame connection node structure according to claim 2, characterized in that: The first rectangular steel pipe (201) and the second rectangular steel pipe (501) are provided with multiple corresponding protruding first flanges (8) on their periphery, and the corresponding flanges (8) are locked and fixed together by flange connecting plates (9) and bolts; The first rectangular steel pipe (201) and the second rectangular steel pipe (501) are lap-welded on both sides of the outer wall of the first column middle longitudinal reinforcement (102). The corner longitudinal reinforcement (101) of the four corners is lap-welded on one side to the outside of the first rectangular steel pipe (201) and the second rectangular steel pipe (501), and lap-welded on the other side to the outer wall of the flange (8).

4. The prefabricated multi-story concrete column frame connection node structure according to claim 3, characterized in that: A liner (502) is fixedly provided on the inner side of the top of the second rectangular steel pipe (501), and the liner (502) protrudes from the top of the second rectangular steel pipe (501); During installation, the liner (502) abuts against the inner wall of the first rectangular steel pipe (201); The bottom of the first rectangular steel pipe (201) abuts against the second rectangular steel pipe (501). Each side of the bottom of the first rectangular steel pipe (201) is provided with a first bevel (202) for welding and fixing with the second rectangular steel pipe (501).

5. The prefabricated multi-story concrete column frame connection node structure according to claim 2, characterized in that: Both the first rectangular steel pipe (201) and the second rectangular steel pipe (501) are fixed with internal partitions (10). The cross-layer concrete column (1) is pre-embedded with grouting pipes (6) and vent pipes (7). One end of the grouting pipe (6) and the vent pipe (7) is flush with the forming surface of the cross-layer concrete column (1), and the other end is connected to the internal partition (10) inside the first rectangular steel pipe (201). The second rectangular steel pipe (501) has a slurry outlet (503) on its outer side, and the slurry outlet (503) is located on the upper part of the inner partition (10) inside the second rectangular steel pipe (501).

6. The prefabricated multi-story concrete column frame connection node structure according to claim 1, characterized in that: The rectangular steel tube assembly (4) in the column includes a third rectangular steel tube (403) prefabricated in the cross-story concrete column (1). An upper inner partition (405) and a lower inner partition (401) are fixed inside the third rectangular steel tube (403). Arc-shaped through holes are provided between the four corners of the upper inner partition (405) and the lower inner partition (401) and the rectangular steel tube (403). The inner walls of the third rectangular steel pipe (403) are welded with column mid-length reinforcement (102). The column mid-length reinforcement (102) between the upper and lower column mid-length steel pipe assemblies (4) are connected and fixed by bending or staggered lap splicing. The column mid-length reinforcement (102) between the column mid-length steel pipe assembly (4) and the column bottom rectangular steel pipe assembly (2) or the column top rectangular steel pipe assembly (5) is the same longitudinal reinforcement, which is welded to the third rectangular steel pipe (403) and the first rectangular steel pipe (201) or the second rectangular steel pipe (501) respectively. The corner longitudinal reinforcement (101) of the four corners of the column penetrates the rectangular steel pipe assembly (4) in the column, and the corner longitudinal reinforcement (101) is located in the arc through hole; the corner longitudinal reinforcement (101) of the four corners of the column is lapped and welded to the outer wall of the first rectangular steel pipe (201) and the second rectangular steel pipe (501).

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

8. The prefabricated multi-story concrete column frame connection node structure according to claim 6, characterized in that: The third rectangular steel pipe (403) is provided with grouting holes (404) on its periphery, and the grouting holes (404) are located between the upper inner partition (405) and the lower inner partition (401); The upper inner partition (405) and the lower inner partition (401) are provided with protruding inner partition flanges (406) on their periphery. The inner partition flanges (406) extend to the outer wall of the third rectangular steel pipe (403). The upper and lower flanges of the H-beam (3) at the end of the beam are welded and fixed to the inner partition flanges (406).

9. A construction method for a prefabricated multi-story concrete column frame connection node structure according to any one of claims 1 to 8, the method steps are as follows: S1. The cross-story 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 assembled first. The column middle rectangular steel pipe assembly (4) is welded with the column middle longitudinal reinforcement (102) at both ends according to the designed floor height and tied with the stirrups (103). Then, the rectangular steel pipe assemblies (4) in each column are placed in place and the longitudinal reinforcement (102) in the middle of the column is lapped between the rectangular steel pipe assemblies (4) in each column. The longitudinal reinforcement (101) at the corner of the column is passed through the rectangular steel pipe assemblies (4) in each column. Then the column base rectangular steel pipe assembly (2) and the column top rectangular steel pipe assembly (5) are placed in place and lap-welded to the column corner longitudinal reinforcement (101) and the column middle longitudinal reinforcement (102); Finally, the formwork was erected and cast together with the interior of the rectangular steel pipe assembly (4) and the outer protective layer of the third rectangular steel pipe (403) to form a cross-story concrete column (1). S2. During installation, hoist the upper span concrete column (1) so that the rectangular steel pipe assembly (2) at the bottom of the upper column is connected to the rectangular steel pipe assembly (5) at the top of the lower column. Then, install the flange connecting plate (9) and lock it in place. Then, weld the first rectangular steel pipe (201) of the upper column to the second rectangular steel pipe (501) of the lower column. Then, remove the flange connecting plate (9) and finally weld the unwelded parts through full penetration. S3. For beam installation, the web plate connecting plate (402) is welded to the third rectangular steel pipe (403). The web of the H-beam (3) at the beam end is welded or bolted to the web plate connecting plate (402). The upper and lower flanges of the H-beam (3) are welded to the inner diaphragm flange (406) or the third rectangular steel pipe (403). S4. Finally, the exposed areas of the column-to-column connection nodes and cross-story beam-column connection nodes are filled with concrete or grout to form a protective layer for the nodes.

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