Composite beam and prefabricated column node connection structure and construction method of formed steel frame

Abstract

The present invention discloses a composite beam and prefabricated column node connection structure and construction method of a formed steel bar skeleton; each longitudinal steel bar of the lower prefabricated column passes through the node upward in the vertical direction, and is connected to the corresponding longitudinal steel bar in the upper prefabricated column through a sleeve extrusion joint above the node; each longitudinal steel bar of the first composite beam passes through the node in the horizontal direction, and is connected to the corresponding longitudinal steel bar in the second composite beam through a sleeve extrusion joint on the other side of the node; multiple longitudinal steel bars in the node range of the lower prefabricated column are provided with multiple stirrups in the core area of ​​the frame node in the vertical direction. During construction, the lower prefabricated column and the second composite beam are first put in place, then the first composite beam is put in place and the casting of the node, the first composite beam and the second composite beam is completed, and finally the upper prefabricated column is hoisted and the casting is completed. The present invention utilizes the characteristics of the industrialized production of formed steel bars and prefabricated concrete components to reduce the workload of the on-site steel bar threading and binding process, save manpower, and effectively reduce production costs.

Description

Technical Field

[0001] The invention relates to the technical field of composite beam and prefabricated column node construction, and in particular to a composite beam and prefabricated column node connection structure of a formed steel bar skeleton and a construction method. Background Art

[0002] Prefabricated concrete components are industrially produced in component factories. After production is completed and transported to the site, they can be directly hoisted into place, with high construction efficiency and low environmental impact.

[0003] However, at present, after the prefabricated parts of the composite beams and the prefabricated columns are hoisted into place, before the cast-in-place concrete is poured, there are still a lot of steel bar threading and binding operations that need to be completed on site, which delays the construction progress, increases labor costs, and seriously restricts the standardization, mechanization and industrialization development of the prefabricated and assembled building industry.

[0004] Shaped steel bars are steel products that are formed by mechanical processing according to the shapes, sizes and requirements specified in the design and construction drawings. Through the automation of steel bar processing in the factory, the quality and efficiency of steel bar processing are improved and the labor costs are reduced.

[0005] However, if formed steel bars are directly used to replace the steel cage structure in the prior art, many inconveniences will be caused during construction. For example, after the steel structure of the composite beam is replaced with a formed steel structure, it will cause obstructions and obstacles when the composite beam is hoisted and put into place, and the steel structure is also prone to collision.

[0006] Therefore, how to combine the formed steel bar skeleton with the prefabricated components has become a technical problem that the technicians in this field need to solve urgently. Summary of the invention

[0007] In view of the above-mentioned defects of the prior art, the present invention provides a composite beam and prefabricated column node connection structure and a construction method of a formed steel frame, the purpose of which is to have structural integrity and seismic resistance, and to meet the requirements basically equivalent to cast-in-place concrete structures. At the same time, the quality and precision of the components can be better guaranteed, and the on-site construction is convenient and easy to operate, which is in line with the development direction of building industrialization.

[0008] To achieve the above object, the present invention discloses a composite beam and precast column node connection structure of a formed steel frame, including a lower precast column, an upper precast column, a first composite beam and a second composite beam fixedly connected as one body at the node.

[0009] Wherein, each longitudinal steel bar of the lower prefabricated column passes through the node upward in the vertical direction, and is connected to the corresponding longitudinal steel bar in the upper prefabricated column through a sleeve extrusion joint above the node;

[0010] Each longitudinal steel bar of the first composite beam passes through the node in the horizontal direction, and is connected to the corresponding longitudinal steel bar in the second composite beam through a sleeve extrusion joint on the other side of the node;

[0011] The lower prefabricated column is provided with a plurality of frame node core area stirrups in the vertical direction on the plurality of longitudinal steel bars within the node range.

[0012] Preferably, the first composite beam comprises a first shaped steel frame, a first prefabricated beam portion and a cast-in-place layer on the top of the beam; the second composite beam comprises a second shaped steel frame, a second prefabricated beam portion and a cast-in-place layer on the top of the beam;

[0013] The first formed steel bar skeleton and the second formed steel bar skeleton are both spatial steel bar products;

[0014] The spatial steel reinforcement product comprises a plurality of longitudinal steel bars arranged in a horizontal direction and corresponding to the top and bottom of the beam respectively, and a plurality of closed stirrups arranged at intervals along the length direction of the plurality of longitudinal steel bars;

[0015] The first prefabricated beam part is a concrete part prefabricated in a factory corresponding to the first composite beam, covering the first formed steel skeleton except the cast-in-place layer at the top of the beam and the post-cast section at the end of the beam;

[0016] The second prefabricated part of the beam is a concrete part prefabricated in the factory corresponding to the corresponding second composite beam, covering the second formed steel skeleton except the cast-in-place layer on the top of the beam;

[0017] The upper surfaces of the first prefabricated beam part and the second prefabricated beam part are both provided with a rough surface for connecting to the cast-in-place layer on the top of the beam, and the end surfaces facing the node are both provided with a keyway for connecting to the post-cast section at the end of the beam;

[0018] The first composite beam and the second composite beam are connected via the beam end post-cast section.

[0019] More preferably, a plurality of closed stirrups are provided along the length direction on the plurality of longitudinal steel bars passing through the node to the other side of the node in the first formed steel bar skeleton.

[0020] More preferably, the distance between the sleeve extrusion joint connected to each longitudinal steel bar at the bottom of the beam corresponding to the first formed steel bar skeleton after passing through the node and the nearest closed stirrup is no more than 50 mm.

[0021] More preferably, the closed stirrup closest to the first formed steel bar skeleton in the second formed steel bar skeleton is a combined closed stirrup;

[0022] The combined closed stirrup includes an open stirrup corresponding to the second formed steel bar framework and having an upper opening in a "U" shape, and a stirrup cap arranged at the upper opening of the open stirrup;

[0023] After all the longitudinal steel bars of the first formed steel bar framework and the second formed steel bar framework are connected through the sleeve extrusion joints, the two ends above the open stirrup are bent inward at 90° to form hooks, and the stirrup cap is welded.

[0024] More preferably, each sleeve extrusion joint connecting the longitudinal steel bars at the bottom of the beam of the first formed steel bar framework and the second formed steel bar framework is located on one side of the combined closed stirrup close to the lower precast column;

[0025] Each sleeve extrusion joint connecting the longitudinal steel bars at the top of the beam of the first formed steel bar framework and the second formed steel bar framework is located on the other side of the combined closed stirrup away from the lower precast column.

[0026] More preferably, the maximum distance D2 between each sleeve extrusion joint connecting the longitudinal steel bars at the bottom of the beam of the first formed steel bar framework and the second formed steel bar framework and the outer wall of the corresponding side of the joint is 0.5 times the section height of the first composite beam or 0.5 times the section height of the second composite beam, but shall not be less than 300 mm;

[0027] The distance D1 between each sleeve extrusion joint connecting the longitudinal steel bars at the top of the beam of the first formed steel bar framework and the second formed steel bar framework and the outer wall of the corresponding side of the joint is determined according to the following requirements:

[0028] When the seismic design category is Class I, D1 is 2 times the section height of the first composite beam or 2 times the section height of the second composite beam, but shall not be less than 500 mm;

[0029] When the seismic design category is Class II to Class IV, D1 is 1.5 times the section height of the first composite beam or 1.5 times the section height of the second composite beam, but shall not be less than 500 mm.

[0030] Preferably, legs are provided on the part of the joint corresponding to the upper precast column;

[0031] The legs are used to support the upper precast column when each longitudinal steel bar of the lower precast column is connected to each longitudinal steel bar of the upper precast column.

[0032] The present invention also provides a construction method for the composite beam and the precast column joint connection structure of the formed steel bar framework, including the following steps:

[0033] Step 1, prefabricate a lower prefabricated column, an upper prefabricated column, a first beam prefabricated portion, and a second beam prefabricated portion;

[0034] Step 2, hoisting the lower prefabricated column and the second prefabricated beam into place;

[0035] Step 3, hoisting the first prefabricated beam, specifically: after inserting the stirrups of the post-casting section of the beam end on the plurality of the longitudinal steel bars where the first formed steel bar skeleton passes through the node, hoisting the first prefabricated beam into place from above the lower prefabricated column downward;

[0036] Step 4, after the first prefabricated part of the beam is in place, the stirrups of the core area of ​​each frame node and the stirrups of each post-cast section of the beam end are positioned and tied in sequence, all the longitudinal steel bars of the first and second formed steel skeletons are connected by sleeve extrusion joints, and then all the stirrups of the first and second formed steel skeletons located in the cast-in-place concrete part during construction are positioned and tied;

[0037] Step 5, pouring concrete of the cast-in-place layer on the top of the beam to form a first composite beam and a second composite beam, and simultaneously pouring concrete of the post-cast section at the end of the beam and the node to form the node;

[0038] Step 6, setting all column bottom post-casting stirrups on the longitudinal reinforcement of the lower prefabricated column passing through the node, and hoisting the upper prefabricated column;

[0039] Step 7: temporarily support the upper precast column by means of legs, position and tie all stirrups of the post-casting section, and use sleeve extrusion joints to connect all longitudinal reinforcements of the lower precast column and the upper precast column, and finally pour concrete.

[0040] Preferably, in step 3, during the process of hoisting the prefabricated part of the beam, when the longitudinal reinforcement at the lower portion of the first composite beam is located below the top end of the longitudinal reinforcement of the lower prefabricated column, and the longitudinal reinforcement at the upper portion of the first composite beam is located above the top end of the longitudinal reinforcement of the lower prefabricated column, a plurality of stirrups of the core area of ​​the frame node are sequentially inserted onto the longitudinal reinforcement of the lower prefabricated column from the top end of the longitudinal reinforcement of the lower prefabricated column between the longitudinal reinforcement at the lower portion and the longitudinal reinforcement at the upper portion of the first composite beam.

[0041] Beneficial effects of the present invention:

[0042] The present invention utilizes the characteristics of industrialized production of formed steel bars and precast concrete components, reduces the workload of on-site steel bar threading and binding, saves human resources, and effectively reduces production costs, providing an economically feasible technical means for further promoting the application of formed steel bar skeletons in precast concrete structures and the standardization, mechanization, and industrialization of the prefabricated building industry.

[0043] The present invention combines formed steel bars with precast concrete components. After being precast in a component factory, they are transported to the construction site. After being hoisted in place, the longitudinal steel bars of the beams and columns are reliably connected using sleeve extrusion joints. Only a small amount of stirrups in the core area of ​​the nodes and the post-casting section of the beams and columns need to be installed on the construction site to quickly cast and shape.

[0044] The connection method of the present invention is more reliable, the on-site construction is more convenient, and the practicability is better.

[0045] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A cross-sectional structural schematic diagram of an embodiment of the present invention is shown.

[0047] Figure 2 A schematic structural diagram of a prefabricated portion of a beam in an embodiment of the present invention is shown.

[0048] Figure 3 A schematic structural diagram of a second prefabricated portion of a beam in one embodiment of the present invention is shown.

[0049] Figure 4 A schematic structural diagram of a lower prefabricated column in an embodiment of the present invention is shown.

[0050] Figure 5 A schematic structural diagram of an upper prefabricated column in an embodiment of the present invention is shown.

[0051] Figure 6 A schematic structural diagram of a combined closed stirrup in one embodiment of the present invention is shown.

[0052] Figure 7 A schematic diagram showing the state of completing step 2 in one embodiment of the present invention is shown.

[0053] Figure 8 A schematic diagram showing the state of implementing step 3 in an embodiment of the present invention is shown.

[0054] Fig. 9 A schematic diagram showing the state of completing step 4 in one embodiment of the present invention is shown.

[0055] Fig.10 A schematic diagram showing the state of completing step 5 in one embodiment of the present invention is shown.

[0056] Fig.11 A schematic diagram showing the state of completing step 6 in one embodiment of the present invention is shown. DETAILED DESCRIPTION

[0057] Example

[0058] like Figures 1 to 5 As shown, the composite beam and precast column node connection structure of the formed steel frame includes a lower precast column 1, an upper precast column 11, a first composite beam 2 and a second composite beam 12 fixedly connected at the node.

[0059] Each longitudinal steel bar of the lower precast column 1 passes through the node upward in the vertical direction, and is connected to the corresponding longitudinal steel bar in the upper precast column 11 through a sleeve extrusion joint 5 above the node;

[0060] Each longitudinal steel bar of the first composite beam 2 passes through the node in the horizontal direction, and is connected to the corresponding longitudinal steel bar in the second composite beam 12 through a sleeve extrusion joint 5 on the other side of the node;

[0061] A plurality of frame node core area stirrups 10 are arranged in the vertical direction on the plurality of longitudinal steel bars within the node range of the lower prefabricated column 1 .

[0062] In practical applications, the lower prefabricated column 1, the upper prefabricated column 11, the first composite beam 2 and the second composite beam 12 are all prefabricated parts of the formed steel bar skeleton.

[0063] The present invention connects one end of the first composite beam 2 across the node between the beams and columns in the cast-in-place section between the first composite beam 2 and the second composite beam 12 on the other side of the node, effectively avoiding problems such as complex steel bar connection and steel bar collision in the core area of ​​the node. It has the advantages of simple on-site construction, strong operability, good structural integrity and seismic resistance of the connection, and is very suitable for promotion and application.

[0064] In some embodiments, the first composite beam 2 includes a first formed steel skeleton 3, a first prefabricated beam portion, and a beam top cast-in-place layer 6; the second composite beam 12 includes a second formed steel skeleton 4, a second prefabricated beam portion, and a beam top cast-in-place layer 6;

[0065] The first formed steel bar skeleton 3 and the second formed steel bar skeleton 4 are both spatial steel bar products;

[0066] The spatial steel reinforcement product includes a plurality of longitudinal steel bars arranged in the horizontal direction, corresponding to the top and bottom of the beam respectively, and a plurality of closed stirrups arranged at intervals along the length direction of the plurality of longitudinal steel bars;

[0067] The first prefabricated part of the beam is a concrete part prefabricated in the factory corresponding to the corresponding first composite beam 2, covering the first formed steel skeleton 3 except the cast-in-place layer 6 at the top of the beam and the post-cast section 7 at the end of the beam;

[0068] The second prefabricated part of the beam is a concrete part prefabricated in the factory corresponding to the corresponding second composite beam 12, covering the second formed steel skeleton 4 except the cast-in-place layer 6 on the top of the beam;

[0069] The upper surfaces of both the first precast beam part and the second precast beam part are provided with rough surfaces for connecting the cast-in-place layer 6 on the beam top, and the end faces facing the joint are provided with key grooves for connecting the post-cast section 7 at the beam end;

[0070] The first composite beam 2 and the second composite beam 12 are connected through the post-cast section 7 at the beam end.

[0071] In the present invention, the formed steel bar skeleton is applied to the precast concrete components. The first composite beam 2 and the cast-in-place layer 6 on the beam top are integrally fabricated in the precast component factory, and only a small amount of stirrups in the joint core area and the post-cast section of the beam-column need to be installed on the construction site.

[0072] The longitudinal steel bars of the first composite beam 2 and the cast-in-place layer 6 on the beam top are reliably connected by sleeve extrusion joints 5 on site, which can effectively solve the problems of time-consuming and laborious steel bar threading and binding in the cast-in-place layer of the composite beam on site, greatly reduce the on-site construction workload, and is conducive to further promoting the application of the formed steel bar skeleton in the precast concrete structure, and further promoting the standardization, mechanization and industrialization of the prefabricated building industry.

[0073] In some embodiments, multiple closed stirrups are provided along the length direction on multiple longitudinal steel bars where the first formed steel bar skeleton 3 passes through the joint to the other side of the joint.

[0074] In some embodiments, the distance between the sleeve extrusion joint 5 connected to each longitudinal steel bar corresponding to the bottom of the first formed steel bar skeleton 3 after passing through the joint and the nearest closed stirrup is not greater than 50 millimeters.

[0075] As Figure 6 shown, in some embodiments, the nearest closed stirrup of the second formed steel bar skeleton 4 to the first formed steel bar skeleton 3 is the combined closed stirrup 13;

[0076] The combined closed stirrup 13 includes an open stirrup 18 corresponding to the second formed steel bar skeleton 4 and having an upper end opening in a "U" shape, and a stirrup cap 16 provided at the upper end opening of the open stirrup 18;

[0077] After all the longitudinal steel bars of the first formed steel bar skeleton 3 and the second formed steel bar skeleton 4 are connected through the sleeve extrusion joints 5, the two ends above the open stirrup 18 are bent inward at 90° and welded to the stirrup cap 16.

[0078] In some embodiments, each sleeve extrusion joint 5 connecting the longitudinal steel bars at the bottom of the first formed steel bar skeleton 3 and the second formed steel bar skeleton 4 is located on the side of the combined closed stirrup 13 close to the lower precast column 1;

[0079] Each sleeve extrusion joint 5 connecting the longitudinal steel bars at the top of the first formed steel bar skeleton 3 and the second formed steel bar skeleton 4 is located on the other side of the combined closed stirrup 13 away from the lower precast column 1.

[0080] In some embodiments, the maximum distance D2 between each sleeve extrusion joint 5 connecting the longitudinal steel bars at the bottom of the first formed steel bar skeleton 3 and the second formed steel bar skeleton 4 and the outer wall on the corresponding side of the node is 0.5 times the cross-sectional height of the first composite beam 2 or 0.5 times the cross-sectional height of the second composite beam 12, but shall not be less than 300 mm;

[0081] The distance D1 between each sleeve extrusion joint 5 connecting the longitudinal steel bars at the top of the first formed steel bar skeleton 3 and the second formed steel bar skeleton 4 and the outer wall on the corresponding side of the node is determined according to the following requirements:

[0082] When the seismic resistance level is level 1, D1 is twice the cross-sectional height of the first composite beam 2 or twice the cross-sectional height of the second composite beam 12, but shall not be less than 500 mm;

[0083] When the seismic resistance level is level 2 to level 4, D1 is 1.5 times the cross-sectional height of the first composite beam 2 or 1.5 times the cross-sectional height of the second composite beam 12, but shall not be less than 500 mm.

[0084] Preferably, a leg 9 is provided on the portion of the node corresponding to the prefabricated column 11;

[0085] The legs 9 are used to support the upper precast column 11 when each longitudinal steel bar of the lower precast column 1 is connected to each longitudinal steel bar of the upper precast column 11 .

[0086] like Figures 7 to 11 As shown, the present invention also provides a construction method for a composite beam and prefabricated column node connection structure of a formed steel bar skeleton, comprising the following steps:

[0087] Step 1, prefabricate the lower prefabricated column 1, the upper prefabricated column 11, the first prefabricated part of the beam and the second prefabricated part of the beam;

[0088] Step 2: hoist the lower prefabricated column 1 and the second prefabricated beam into place;

[0089] Step 3, hoisting the prefabricated part of the beam, specifically: after inserting the stirrups 14 of the post-cast section of the beam end on the multiple longitudinal steel bars of the first formed steel bar skeleton 3 passing through the node, hoisting the prefabricated part of the beam from the top of the lower prefabricated column 1 downward into place;

[0090] Step 4, after the first prefabricated part of the beam is in place, the stirrups 10 in the core area of ​​each frame node and the stirrups 14 in the post-cast section of each beam end are positioned and tied in sequence, and all the longitudinal steel bars of the first formed steel skeleton 3 and the second formed steel skeleton 4 are connected by a sleeve extrusion joint 5, and then all the stirrups of the first formed steel skeleton 3 and the second formed steel skeleton 4 located in the cast-in-place concrete part during construction are positioned and tied;

[0091] Step 5, pouring concrete of the cast-in-place layer 6 on the top of the beam to form the first composite beam 2 and the second composite beam 12, and simultaneously pouring concrete of the post-cast section 7 at the end of the beam and the node to form a node;

[0092] Step 6: Arrange all column bottom post-casting stirrups 15 on the longitudinal reinforcements passing through the nodes of the lower precast column 1, and hoist the upper precast column 11;

[0093] Step 7: temporarily support the upper precast column 11 by the legs 9, position and tie all the stirrups of the post-cast section 8, and use the sleeve extrusion joint 5 to connect all the longitudinal steel bars of the lower precast column 1 and the upper precast column 11, and finally pour the concrete.

[0094] In certain embodiments, in step 3, during the process of hoisting a prefabricated portion of the hoisting beam, when the lower longitudinal reinforcement of the first composite beam 2 is located below the top of the longitudinal reinforcement of the lower prefabricated column 1, and the upper longitudinal reinforcement of the first composite beam 2 is located above the top of the longitudinal reinforcement of the lower prefabricated column 1, a plurality of frame node core area stirrups 10 are sequentially inserted onto the longitudinal reinforcement of the lower prefabricated column 1 from the top of the longitudinal reinforcement of the lower prefabricated column 1, between the lower and upper longitudinal reinforcements of the first composite beam 2.

[0095] In practical applications, concrete of the cast-in-place layer 6 and the post-cast section 7 at the beam end is poured to form the first composite beam 2 and the second composite beam 12, and concrete of the frame core area of ​​the node is poured simultaneously.

[0096] After the node concrete reaches the design strength, the stirrups in the post-cast section at the bottom of the column and the unextruded sleeve 17 are respectively inserted into the longitudinal reinforcement that needs to be connected to the upper precast column 11 at the lower precast column 1.

[0097] After the upper prefabricated column 11 is hoisted into place, the upper prefabricated column 11 is temporarily supported by the legs 9, and an operating space for connecting the longitudinal reinforcement is reserved.

[0098] When the upper precast column 11 is positioned by the legs 9, the stirrups of the post-cast section at the bottom of the column are positioned and tied, and the longitudinal reinforcement of the upper precast column 11 is connected to the longitudinal reinforcement of the lower precast column 1 through the sleeve extrusion joint 5. After the connection of the column longitudinal reinforcement is completed, the concrete of the post-cast section 8 at the bottom of the column is poured.

[0099] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. Composite beam of formed steel bar skeleton and precast column joint connection structure, including a lower precast column (1), an upper precast column (11), a first composite beam (2) and a second composite beam (12) fixedly connected into one body at the joint; It is characterized in that: Each longitudinal steel bar of the lower precast column (1) passes vertically upward through the joint, and is connected to the corresponding longitudinal steel bar in the upper precast column (11) through a sleeve extrusion joint (5) above the joint; Each longitudinal steel bar of the first composite beam (2) passes horizontally through the joint, and is connected to the corresponding longitudinal steel bar in the second composite beam (12) through a sleeve extrusion joint (5) on the other side of the joint; Multiple vertical frame joint core area stirrups (10) are arranged vertically on multiple longitudinal steel bars of the lower precast column (1) within the joint range; The first composite beam (2) includes a first formed steel bar skeleton (3), a first precast part of the beam and a cast-in-place layer (6) on the top of the beam; the second composite beam (12) includes a second formed steel bar skeleton (4), a second precast part of the beam and a cast-in-place layer (6) on the top of the beam; Both the first formed steel bar skeleton (3) and the second formed steel bar skeleton (4) are spatial steel products; The spatial steel product includes multiple longitudinal steel bars arranged horizontally corresponding to the top and bottom of the beam respectively, and multiple closed stirrups arranged at intervals along the length direction of the multiple longitudinal steel bars; The first precast part of the beam is the concrete part prefabricated in the factory corresponding to the corresponding first composite beam (2), covering the part of the first formed steel bar skeleton (3) except the cast-in-place layer (6) on the top of the beam and the post-cast section (7) at the beam end; The second precast part of the beam is the concrete part prefabricated in the factory corresponding to the corresponding second composite beam (12), covering the part of the second formed steel bar skeleton (4) except the cast-in-place layer (6) on the top of the beam; The upper surfaces of the first precast part of the beam and the second precast part of the beam are both provided with rough surfaces for connecting the cast-in-place layer (6) on the top of the beam, and key grooves for connecting the post-cast section (7) at the beam end are arranged on the end faces facing the joint; Multiple closed stirrups are arranged along the length direction on multiple longitudinal steel bars of the first formed steel bar skeleton (3) passing through the joint to the other side of the joint; The closest closed stirrup of the second formed steel bar skeleton (4) to the first formed steel bar skeleton (3) is a combined closed stirrup (13); The combined closed stirrup (13) includes an open stirrup (18) corresponding to the second formed steel bar skeleton (4) and having an open end in the shape of "凵" at the upper end, and a stirrup cap (16) arranged at the open end of the open stirrup (18); After all longitudinal steel bars of the first formed steel bar skeleton (3) and the second formed steel bar skeleton (4) are connected through the sleeve extrusion joint (5), the two ends above the open stirrup (18) are bent inward at 90° and welded to the stirrup cap (16).

2. The composite beam of formed steel bar skeleton and precast column joint connection structure according to claim 1, It is characterized in that, The distance between the sleeve extrusion joint (5) connected to each longitudinal steel bar at the bottom of the beam of the first formed steel bar skeleton (3) after passing through the node and the nearest closed stirrup is no more than 50 mm.

3. The composite beam and prefabricated column node connection structure of the formed steel bar skeleton according to claim 2, It is characterized in that Each of the sleeve extrusion joints (5) connecting the longitudinal steel bars at the bottom of the beam of the first formed steel bar skeleton (3) and the second formed steel bar skeleton (4) is located on a side of the combined closed stirrup (13) close to the lower prefabricated column (1); Each of the sleeve extrusion joints (5) connecting the longitudinal steel bars at the top of the beam of the first formed steel bar skeleton (3) and the second formed steel bar skeleton (4) is located on the other side of the combined closed stirrup (13) away from the lower prefabricated column (1).

4. The composite beam and prefabricated column node connection structure of the formed steel frame according to claim 3, It is characterized in that The maximum distance D2 between each sleeve extrusion joint (5) connecting the longitudinal steel bars at the bottom of the beam of the first formed steel bar skeleton (3) and the second formed steel bar skeleton (4) and the outer wall on the corresponding side of the node is 0.5 times the cross-sectional height of the first composite beam (2) or 0.5 times the cross-sectional height of the second composite beam (12), but shall not be less than 300 mm; The distance D1 between each sleeve extrusion joint (5) of the longitudinal steel bars connected at the top of the beam of the first formed steel bar skeleton (3) and the second formed steel bar skeleton (4) and the outer wall on the corresponding side of the node is determined according to the following requirements: When the seismic resistance level is level one, D1 is twice the cross-sectional height of the first composite beam (2) or twice the cross-sectional height of the second composite beam (12), but shall not be less than 500 mm; When the seismic resistance level is level 2 to level 4, D1 is 1.5 times the cross-sectional height of the first composite beam (2) or 1.5 times the cross-sectional height of the second composite beam (12), but shall not be less than 500 mm.

5. The composite beam and prefabricated column node connection structure of the formed steel bar skeleton according to claim 4, It is characterized in that A portion of the node corresponding to the upper prefabricated column (11) is provided with a support leg (9); The supporting legs (9) are used to support the upper prefabricated column (11) when each of the longitudinal steel bars of the lower prefabricated column (1) is connected to each of the longitudinal steel bars of the upper prefabricated column (11).

6. The construction method of the composite beam and prefabricated column node connection structure of the formed steel bar skeleton according to claim 1, It is characterized in that The steps include: Step 1, prefabricate a lower prefabricated column (1), an upper prefabricated column (11), a first beam prefabricated portion, and a second beam prefabricated portion; Step 2, hoisting the lower prefabricated column (1) and the second prefabricated beam into place; Step 3, hoisting the prefabricated beam part 1, specifically: after inserting the beam end post-casting section stirrups (14) on the plurality of longitudinal steel bars passing through the node of the first formed steel bar skeleton (3), hoisting the prefabricated beam part 1 downward from the top of the lower prefabricated column (1) into place; Step 4, after the first prefabricated part of the beam is in place, the stirrups (10) in the core area of ​​each frame node and the stirrups (14) in the post-casting section of each beam end are positioned and tied in sequence, and all the longitudinal steel bars of the first formed steel skeleton (3) and the second formed steel skeleton (4) are connected by a sleeve extrusion joint (5), and then all the stirrups of the first formed steel skeleton (3) and the second formed steel skeleton (4) located in the post-casting section (7) of the beam end are positioned and tied; Step 5, pouring concrete of the cast-in-place layer (6) on the top of the beam to form the first composite beam (2) and the second composite beam (12), and simultaneously pouring the post-cast section (7) at the end of the beam to form the node; Step 6, arranging all column bottom post-casting stirrups (15) on the longitudinal reinforcement of the lower prefabricated column (1) passing through the node, and hoisting the upper prefabricated column (11); Step 7: temporarily support the upper precast column (11) by means of the legs (9), position and tie all the stirrups of the post-casting section (8), and use the sleeve extrusion joint (5) to connect all the longitudinal steel bars of the lower precast column (1) and the upper precast column (11), and finally pour concrete.

7. The construction method of the composite beam and prefabricated column node connection structure of the formed steel bar skeleton according to claim 6, It is characterized in that In step 3, during the process of hoisting the first prefabricated part of the beam, when the longitudinal reinforcement at the lower portion of the first composite beam (2) is located below the top end of the longitudinal reinforcement of the lower prefabricated column (1), and the longitudinal reinforcement at the upper portion of the first composite beam (2) is located above the top end of the longitudinal reinforcement of the lower prefabricated column (1), a plurality of stirrups (10) of the core area of ​​the frame node are inserted into the longitudinal reinforcement of the lower prefabricated column (1) from the top end thereof, between the longitudinal reinforcement at the lower portion and the longitudinal reinforcement at the upper portion of the first composite beam (2).

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