Field-free assembly type beam-column joint and construction method

Abstract

The application provides a field-welding-free assembled beam-column joint and a construction method, which comprises a beam-column intermediate connecting piece, the upper and lower ends of the beam-column intermediate connecting piece are respectively inserted with a steel pipe column provided with a first protruding block, the periphery of the beam-column intermediate connecting piece is inserted with a steel beam provided with a second protruding block, the adjacent steel beams are jointly connected with a limiting connecting assembly, at least one set of limiting support assemblies is arranged between the upper end of the beam-column intermediate connecting piece and each steel beam, and the adjacent limiting support assemblies are inserted with each other. The problems of large labor quantity in the joint installation process, insufficient stress bearing capacity, insufficient anti-seismic performance and insufficient stability performance of the structure in the use process are solved.

Description

Technical Field

[0001] This invention belongs to the field of steel structure node connection in prefabricated buildings, specifically relating to a prefabricated beam-column node without on-site welding and its construction method. Background Technology

[0002] In recent years, research in my country's civil engineering field has deepened, and the application of prefabricated structures in construction has become increasingly widespread. Prefabricated buildings play a crucial role in the development of building industrialization. Compared with traditional concrete structures, prefabricated steel structures offer advantages such as environmentally friendly materials, lighter weight, better seismic performance, more flexible structural layout, and the ability to achieve large-scale and standardized production. This significantly improves production efficiency, effectively saves labor, and substantially reduces environmental pollution problems such as construction waste and on-site noise, thus meeting the requirements of sustainable development.

[0003] However, the current development of prefabricated steel structures still faces numerous challenges. The industrial chain and economies of scale are not fully formed, market acceptance is insufficient, and structural performance suffers from inadequate stress-bearing capacity at joints, poor seismic resistance, and instability during use. Safety levels are also low, and on-site work is labor-intensive, significantly limiting the installation efficiency of beam-column joints and reducing structural safety. To address these issues, this patent proposes a prefabricated beam-column joint without on-site welding and its construction method. Summary of the Invention

[0004] The purpose of this invention is to provide a prefabricated beam-column joint without on-site welding and a construction method to solve the problems of high labor intensity during joint installation and insufficient stress bearing capacity, seismic performance and stability of the joint during use.

[0005] A prefabricated beam-column joint without on-site welding includes a beam-column intermediate connector. A steel pipe column with a first protrusion is inserted into each of the upper and lower ends of the beam-column intermediate connector. A steel beam with a second protrusion is inserted into each of the four sides of the beam-column intermediate connector. Adjacent steel beams are connected together by a limit connection assembly. At least one set of limit support assemblies is provided between the upper end of the beam-column intermediate connector and each steel beam. Adjacent limit support assemblies are interlocked.

[0006] Furthermore, the beam-column intermediate connector includes a sleeve, with steel pipe column connecting parts provided above and below the sleeve. The side of the steel pipe column connecting part is provided with a first insertion groove that mates with the first protrusion. A steel beam connecting part is provided on the side of the sleeve, between the two steel pipe column connecting parts. The steel beam connecting part includes an upper top plate and a lower bottom plate. The lower surface of the top plate and the upper surface of the bottom plate are both provided with a second insertion groove that mates with the second protrusion.

[0007] Furthermore, a third insertion groove is provided at the upper end of the steel pipe column connection part located at the upper part of the sleeve, and the limiting support component is provided with a third protrusion that cooperates with the third insertion groove.

[0008] Furthermore, the steel pipe column connection is composed of multiple L-shaped corner plates welded together, with a first insertion groove formed between adjacent corner plates.

[0009] Furthermore, the limiting connection assembly includes a transverse connecting plate, with two adjacent steel beams connected to each end of the transverse connecting plate, and a set of fastener assemblies connected to the upper and lower ends of the transverse connecting plate, each fastener assembly being connected to a sleeve.

[0010] Furthermore, the fastener assembly includes a fastener plate, the fastener plate is connected to an M-shaped adapter plate, the fastener plate is snapped into a transverse connecting plate, the middle recess of the M-shaped adapter plate is snapped into the edge of the sleeve, and the left and right wings of the M-shaped adapter plate are respectively connected to a steel beam.

[0011] Furthermore, the lower snap plate located at the bottom of the horizontal connecting plate is engaged with the middle part of the horizontal connecting plate, and the upper snap plate located at the top of the horizontal connecting plate is engaged with the horizontal connecting plate on the left and right sides of the lower snap plate.

[0012] Furthermore, there are multiple second protrusions, which are arranged in parallel to each other, and a connecting groove is formed between two adjacent second protrusions. The lower end of the limiting support component is inserted into the connecting groove.

[0013] Furthermore, the limiting support assembly includes a steel beam connecting plate, a diagonal brace, and a steel pipe column connecting plate connected in sequence. The steel beam connecting plate is inserted into the connecting groove, and the lower end of the steel pipe column connecting plate is provided with a third protrusion that cooperates with the third insertion groove.

[0014] Furthermore, two sets of limiting support components are provided on each side of the steel pipe column connection, and the two steel pipe column connection plates in the two sets of limiting support components are interlocked.

[0015] Furthermore, the steel pipe column connecting plate on the left side has a downward first connecting groove on its right side, and the steel pipe column connecting plate on the right side has an upward second connecting groove on its left side, with the two connecting grooves interlocking.

[0016] Furthermore, the lower right side of the first connecting groove is provided with a first protrusion that mates with the second connecting groove, and the upper left side of the second connecting groove is provided with a second protrusion that mates with the first connecting groove.

[0017] Furthermore, the steel beam is an H-shaped steel beam.

[0018] Furthermore, the thickness of the top plate and bottom plate is three times the thickness of the flange plate of the H-beam.

[0019] This invention also discloses a construction method for a prefabricated beam-column joint structure without on-site welding, the steps of which are as follows:

[0020] Step 1: Prefabricate steel pipe columns, steel beams, sleeves, top plates, bottom support plates, L-shaped corner plates, square steel plates, limit connection components, limit support components and corresponding matching bolts in the factory, and reserve bolt holes at the corresponding positions of the components;

[0021] Step 2: Weld the first protrusion to the steel pipe column and the second protrusion to the steel beam; weld the top plate and bottom plate to the side of the sleeve respectively; weld the two square steel plates to the upper and lower openings of the sleeve connector to close the sleeve; weld the eight L-shaped corner plates to the upper and lower ends of the sleeve; weld the steel pipe column connecting plate, diagonal brace, and steel beam connecting plate to form a limiting support; weld the transition corner plate to the transverse connecting plate; weld the M-shaped connecting plate, transverse plate, and buckle plate to form a fastener assembly.

[0022] Step 3: Transport the welded steel pipe columns with the first protrusion, the intermediate connecting parts between beams and columns, the steel beams with the second protrusion, and other accessories to the construction site.

[0023] Step 4: Vertically insert the first protrusion of the upper and lower steel pipe columns into the first insertion groove of the steel pipe column connection part, and connect the steel pipe columns to the steel pipe column connection part using through bolts;

[0024] Step 5: Insert the second protrusion of the steel beam horizontally into the second insertion slots on the top plate and the bottom plate, and connect the steel beam to the side of the top plate and the side of the bottom plate with through bolts;

[0025] Step 6: Insert the beam connecting plate of the limiting support into the connecting groove at the upper end of the steel beam, overlap the two column connecting plates of the adjacent limiting support through the first groove and the second groove, insert the third protrusion into the third slot at the upper end of the column connection, and connect the limiting support to the square steel pipe column and the steel beam with through bolts.

[0026] Step 7: Connect the limiting connection assembly to the sleeve and steel beam respectively with bolts to form an integral structure.

[0027] The beneficial effects of this invention are:

[0028] (1) The invention adopts the method of processing prefabricated components in the factory and then transporting them to the construction site for assembly. The construction process involves zero welding on site, which avoids various defects caused by improper on-site welding operations, eliminates safety hazards of on-site welding operations, and reduces the workload of workers on-site construction.

[0029] (2) The components of this invention adopt a connection method that combines concave-convex insertion and bolt connection, which simply and effectively connects steel pipe columns, steel beams, and intermediate beam-column connectors into a whole, improving the overall performance at the structural nodes and effectively enhancing the seismic performance of the structure.

[0030] (3) The steel beam bears the pressure and the force opposite to the pressure during earthquake through the top plate, bottom plate and connecting bolts. The connection between the second protrusion on the beam and the second insertion groove of the intermediate connector effectively restricts the horizontal displacement of the steel beam and bears the horizontal force on the beam.

[0031] (4) The invention adopts the method of directly connecting beams and columns with intermediate beam-column connectors, which simplifies the structural construction and installation process, shortens the structural installation time, and achieves the purpose of reducing the construction period.

[0032] (5) This invention utilizes the combined limiting connection component and limiting support component to improve the stability of the steel beam both inside and outside the plane, reduce the possibility of buckling deformation of the steel beam, and constrain the displacement between steel beams and between the steel beam and the intermediate connecting parts of the beam and column and the steel pipe column. By using the mutual restraint of components, the compressive and shear bearing capacity of the beam-column joint is effectively improved. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is an overall structural diagram of the invention;

[0035] Figure 2 This is a schematic diagram of the intermediate connecting component between beams and columns;

[0036] Figure 3 This is a schematic diagram of the upper steel pipe column structure;

[0037] Figure 4 This is a schematic diagram of the steel beam structure;

[0038] Figure 5 This is a schematic diagram of the limiting support structure installed on the front and rear sides;

[0039] Figure 6 This is a schematic diagram of the limiting support structure installed on the left and right sides;

[0040] Figure 7 This is a schematic diagram of the limiting connector structure;

[0041] Figure 8 This is a schematic diagram of the upper fastener assembly and the lower fastener assembly;

[0042] In the diagram, 1-Steel pipe column; 1.1-First protrusion; 1.2-First transverse through hole; 1.3-Second transverse through hole; 2-Steel beam; 2.1-Second protrusion; 2.2-Fifth transverse through hole; 2.3-Sixth transverse through hole; 3-Beam-column intermediate connector; 3.1-Sleeve; 3.1.1-Third transverse through hole; 3.2-Steel pipe column connector; 3.2.1-First insertion groove; 3.2.2-Third insertion groove; 3.2.3-Seventh transverse through hole; 3.3-Top plate; 3.3.1-Fourth transverse through hole; 3.4-Bottom plate; 4-Limiting support assembly; 4.1-Steel pipe column connecting plate; 4.1.1-Third protrusion block; 4.2-Diagonal brace; 4.3-Steel beam connecting plate; 5-Limiting connection assembly; 5.1-Turn corner plate; 5.2-Transverse connecting plate; 5.3-Curved plate; 5.4-M-shaped connecting plate; 5.5-Horizontal plate; 5.6-Lower buckle plate; 5.7-Upper buckle plate. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0044] In the description of this invention, it should be understood that the terms “inner,” “outer,” “left,” and “right” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] This invention discloses a prefabricated beam-column joint that requires no on-site welding, such as... Figure 1 As shown, the node includes a beam-column intermediate connector 3, steel pipe columns 1 located above and below the beam-column intermediate connector, and four steel beams 2 located around the beam-column intermediate connector. A limiting support assembly 4 is set between the steel beams and the beam-column intermediate connector, and a limiting connection assembly 5 connected to the beam-column intermediate connector is set between two adjacent steel beams. The limiting support assembly and the limiting connection assembly work together to improve the stability of the steel beams inside and outside the plane and reduce the possibility of buckling deformation of the steel beams.

[0046] like Figure 2As shown, the beam-column intermediate connector 3 includes a central sleeve 3.1, two steel pipe column connecting parts 3.2 welded to the upper and lower ends of the sleeve, a top plate 3.3 welded to the upper side of the sleeve, and a bottom plate 3.4 welded to the lower side of the sleeve.

[0047] The specific structure of the beam-column intermediate connector is as follows: Sleeve 3.1 is a hexahedral structure composed of six welded steel plates; the steel pipe column connector is a hollow tetrahedral cavity formed by eight L-shaped corner plates. A set of tetrahedral cavities is welded to both the upper and lower ends of the hexahedral structure. Adjacent corner plates on the same side of the cavity are not connected; the unconnected portion forms the first insertion groove 3.2.1. For example... Figure 3 As shown, the steel pipe column is a rectangular tube structure. T-shaped first protrusions 1.1 are welded to the lower four sides of the upper steel pipe column 1 and the upper four sides of the lower steel pipe column. These first protrusions are interlocked with first insertion slots 3.2.1. Multiple horizontal first transverse through holes 1.2 are machined on all four sides of the steel pipe column 1. The first transverse through holes on adjacent steel pipe column sides are not on the same horizontal line. Multiple second transverse through holes 1.3 are machined above the first transverse through holes. The second transverse through holes on adjacent steel pipe column sides are not on the same horizontal line. The first transverse through holes 1.2 are connected to corner plates, and the second transverse through holes 1.3 are connected to... Figure 5 The upper end of the steel pipe column connecting plate 4.1 of the middle limiting support component 4 is connected. The upper end face of the upper corner plate is machined with a trapezoidal third insertion groove 3.2.2, and the lower end of the steel pipe column connecting plate 4.1 of the limiting support component 4 is provided with a trapezoidal third protrusion 4.1.1, which is inserted into the third insertion groove 3.2.2. Both webs of the corner plate are machined with multiple horizontal seventh transverse through holes 3.2.3, and the holes on the two webs of the same corner plate are staggered. The through holes on the two corner plates on opposite sides of the four-sided cavity are coaxially arranged. When the steel pipe column 1 is inserted into the four-sided cavity, the bolt passes through the seventh transverse through hole 3.2.3 on the front corner plate of the steel pipe column, the first transverse through hole 1.2 on the steel pipe column, and the seventh transverse through hole 3.2.3 on the rear corner plate of the steel pipe column in sequence, connecting the steel pipe column and the corner plate into a whole.

[0048] A space is reserved between the top plate 3.3 and the bottom plate 3.4 for a steel beam connection. A third transverse through hole 3.1.1 is machined on the side wall of the sleeve within this space, and the sleeve is fixedly connected to the limiting connection assembly 5 through this third transverse through hole. A trapezoidal second insertion groove is machined on the lower end face of the top plate 3.3 and the upper end face of the bottom plate 3.4. Multiple fourth transverse through holes 3.3.1 are machined on the sides of the top and bottom plates. Figure 4As shown, steel beam 2 is I-shaped. Multiple parallel second protrusions 2.1 are welded to the upper surface of the upper flange and the lower surface of the lower flange of the I-beam. The cross-section of each second protrusion is trapezoidal, and a trapezoidal connecting groove is formed between adjacent trapezoidal second protrusions. Multiple horizontal fifth transverse through holes 2.2 are machined on the side of the second protrusions, and multiple horizontal sixth transverse through holes 2.3 are machined on the web of the I-beam. After the second protrusion 2.1 at the end of the steel beam is inserted into the second insertion groove, it is bolted through the fourth transverse through hole 3.3.1 and the fifth transverse through hole 2.2, and connected by a nut. The connecting groove formed at the other end of the second protrusion 2.1 connects with… Figure 5 After the steel beam connecting plate 4.3 of the middle limit support component 4 is inserted, it is bolted through the fifth transverse through hole 2.2 on the corresponding side and then fixed by nuts.

[0049] like Figure 5-6 As shown, the limiting support assembly includes a steel pipe column connecting plate 4.1, a diagonal brace 4.2, and a steel beam connecting plate 4.3 connected in sequence. The steel beam connecting plate 4.3 is inserted into the connecting groove. The lower end of the steel pipe column connecting plate 4.1 is provided with a third protrusion 4.1.1 that cooperates with the third insertion groove 3.2.2.

[0050] Two sets of limiting support assemblies 4 are provided on each side of the steel pipe column connection part 3.2, and the two steel pipe column connection plates in the two sets of limiting support assemblies are interlocked. That is, in the same plane, the steel pipe column connection plate on the left side has a downward first connecting groove on its right side, and a first protrusion that mates with the second connecting groove is provided at the lower end of the right side of the first connecting groove. The steel pipe column connection plate on the right side has an upward second connecting groove on its left side, and a second protrusion that mates with the first connecting groove is provided at the upper end of the left side of the second connecting groove. The two connecting grooves and the two protrusions are interlocked. The outer surfaces of the steel pipe column connection plates on the front and rear sides of the steel pipe column have trapezoidal protrusions, and the outer surfaces of the steel pipe column connection plates on the left and right sides of the steel pipe column have trapezoidal grooves. After the limiting support assembly 4 is installed and connected to the steel pipe column 1 and the steel pipe column connection part 3.2, the trapezoidal protrusions are inserted into the trapezoidal grooves, and then bolts are used to pass through the steel pipe column connection plates on the opposite sides, and nuts are used to tighten them. After the beam connecting plate is inserted into the connecting groove on the H-shaped steel beam, the bolt passes through the fourth transverse through hole 3.3.1 of the two connecting plates and the fifth transverse through hole 2.2 of the second protrusion on the steel beam, and is tightened with a nut.

[0051] like Figure 7-8As shown, the limiting connection assembly includes a transverse connecting plate 5.2, which is a steel pipe or shaped steel. A transition angle plate 5.1 is connected to each end of the transverse connecting plate, and each transition angle plate is connected to a corresponding steel beam 2. The same limiting connection assembly connects two intersecting steel beams in the horizontal plane through the two transition angle plates at both ends. A snap-fit ​​plate 5.7 is fastened and installed above the transverse connecting plate 5.2. This snap-fit ​​plate consists of two independent inverted U-shaped structural plates. A horizontal plate 5.5 is connected to the side of each inverted U-shaped structural plate, and the other ends of the two horizontal plates are connected to an M-shaped transition plate 5.4. The middle recess of the M-shaped transition plate engages with the edge where the two planes of the sleeve intersect. A curved plate 5.3 is connected to the left and right wings of the M-shaped transition plate, and the curved plates are connected to the steel beams through the transition angle plates.

[0052] A lower snap plate 5.6 is fastened and installed below the transverse connecting plate 5.2. This lower snap plate is a U-shaped structural plate. The lower snap plate is snapped up onto the part between the two upper snap plates on the transverse connecting plate. Each side of the U-shaped structural plate is connected to a horizontal plate 5.5. The other ends of the two horizontal plates are connected to another M-shaped adapter plate 5.4. The middle recess of the M-shaped adapter plate is engaged with the edge at the intersection of the two planes of the sleeve. The left and right wing plates of the M-shaped adapter plate are each connected to the lower part of the two curved plates 5.3 connected to the upper M-shaped adapter plate. The curved plates are connected to the steel beam through the transition angle plate.

[0053] This invention also discloses a construction method for a prefabricated beam-column joint structure without on-site welding, the steps of which are as follows:

[0054] Step 1: Prefabricate steel pipe columns, steel beams, sleeves, top plates, bottom plates, L-shaped corner plates, square steel plates, limit connection components, limit support components and corresponding matching bolts in the factory, and reserve bolt holes at the corresponding positions of the components;

[0055] Step 2: Weld the first protrusion to the steel pipe column and the second protrusion to the steel beam; weld the top plate and bottom plate to the side of the sleeve respectively; weld the two square steel plates to the upper and lower openings of the sleeve connector to close the sleeve; weld the eight L-shaped corner plates to the upper and lower ends of the sleeve; weld the steel pipe column connecting plate, diagonal brace, and steel beam connecting plate to form a limiting support; weld the transition corner plate to the transverse connecting plate; weld the M-shaped connecting plate, transverse plate, and buckle plate to form a fastener assembly.

[0056] Step 3: Transport the welded steel pipe columns with the first protrusion, the intermediate connecting parts between beams and columns, the steel beams with the second protrusion, and other accessories to the construction site.

[0057] Step 4: Vertically insert the first protrusion of the upper and lower steel pipe columns into the first insertion groove of the steel pipe column connection part, and connect the steel pipe columns to the steel pipe column connection part using through bolts;

[0058] Step 5: Insert the second protrusion of the steel beam horizontally into the second insertion slots on the top plate and the bottom plate, and connect the steel beam to the side of the top plate and the side of the bottom plate with through bolts;

[0059] Step 6: Insert the beam connecting plate of the limiting support into the connecting groove at the upper end of the steel beam and connect it with the through bolt. Connect the two column connecting plates of the adjacent limiting support through the first groove and the second groove. Insert the third protrusion into the third slot at the upper end of the column connection. Connect the limiting support to the square steel tube column with the through bolt.

[0060] Step 7: Connect the limiting connection assembly to the sleeve and steel beam respectively with bolts to form an integral structure.

[0061] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A prefabricated beam-column joint without on-site welding, characterized in that, The system includes a beam-column intermediate connector, wherein a steel pipe column with a first protrusion is inserted into each of the upper and lower ends of the beam-column intermediate connector, and a steel beam with a second protrusion is inserted into each of the four sides of the beam-column intermediate connector. Adjacent steel beams are connected together by a limit connection assembly. A limit support assembly is provided between the upper end of the beam-column intermediate connector and each steel beam, and adjacent limit support assemblies are interlocked. The beam-column intermediate connector includes a sleeve, with steel pipe column connecting parts provided above and below the sleeve. The side of the steel pipe column connecting part is provided with a first insertion groove that mates with the first protrusion. A steel beam connecting part is provided on the side of the sleeve, between the two steel pipe column connecting parts. The steel beam connecting part includes an upper top plate and a lower bottom plate. The lower surface of the top plate and the upper surface of the bottom plate are both provided with a second insertion groove that mates with the second protrusion. A third insertion groove is provided at the upper end of the steel pipe column connection part located at the upper part of the sleeve, and the limiting support component is provided with a third protrusion that cooperates with the third insertion groove; Two sets of limiting support components are provided on each side of the steel pipe column connection, and the two steel pipe column connection plates in the two sets of limiting support components are interlocked.

2. The prefabricated beam-column joint without on-site welding according to claim 1, characterized in that, The steel pipe column connection part is a hollow four-sided cavity composed of eight L-shaped corner plates welded together. A first insertion groove is formed between adjacent corner plates to cooperate with the first protrusion block. Multiple horizontal first transverse through holes are machined on all four sides of the steel pipe column, and multiple horizontal seventh transverse through holes are machined on both webs of the corner plates. When the steel pipe column is inserted into the hollow four-sided cavity, bolts pass through the seventh transverse through holes on the front corner plate of the steel pipe column, the first transverse through holes on the steel pipe column, and the seventh transverse through holes on the rear corner plate of the steel pipe column in sequence, connecting the steel pipe column and the corner plates into a whole.

3. The prefabricated beam-column joint without on-site welding according to claim 2, characterized in that, The limiting connection assembly includes a transverse connecting plate, with a transition angle plate connected to each end of the transverse connecting plate. Each transition angle plate is connected to a corresponding steel beam. The same limiting connection assembly is connected to two intersecting steel beams in the horizontal plane through the two transition angle plates at both ends. A set of fasteners is connected to the upper and lower parts of the transverse connecting plate, and each set of fasteners is connected to the sleeve.

4. The prefabricated beam-column joint without on-site welding according to claim 3, characterized in that, The fastener assembly includes an upper fastener plate and a lower fastener plate; A snap-on plate is fastened and installed above the horizontal connecting plate. The snap-on plate consists of two independent inverted U-shaped structural plates. Each inverted U-shaped structural plate has a horizontal plate connected to its side. The other ends of the two horizontal plates are connected to an M-shaped transition plate. The middle recess of the M-shaped transition plate is engaged with the edge of the sleeve where the two planes intersect. The left and right wings of the M-shaped transition plate are each connected to a curved plate. The curved plates are connected to the steel beam through transition angle plates. A lower snap-fit ​​plate is fastened and installed below the transverse connecting plate. This lower snap-fit ​​plate is a U-shaped structural plate. The lower snap-fit ​​plate is snapped up onto the part between the two upper snap-fit ​​plates on the transverse connecting plate. Each side of the U-shaped structural plate is connected to a horizontal plate. The other ends of the two horizontal plates are connected to another M-shaped adapter plate. The middle recess of the M-shaped adapter plate is engaged with the edge at the intersection of the two planes of the sleeve. The left and right wing plates of the M-shaped adapter plate are each connected to the lower part of the two curved plates connected to the upper M-shaped adapter plate. The curved plates are connected to the steel beam through the transition angle plate.

5. A prefabricated beam-column joint without on-site welding according to claim 4, characterized in that, There are multiple second protrusions, which are arranged in parallel to each other. A connecting groove is formed between two adjacent second protrusions, and the lower end of the limiting support component is inserted into the connecting groove.

6. A prefabricated beam-column joint without on-site welding according to claim 5, characterized in that, The limiting support assembly includes a steel beam connecting plate, a diagonal brace, and a steel pipe column connecting plate connected in sequence. The steel beam connecting plate is inserted into the connecting groove, and the lower end of the steel pipe column connecting plate is provided with a third protrusion that cooperates with the third insertion groove. Multiple fourth transverse through holes are machined on the sides of the top plate and bottom plate, and multiple fifth transverse through holes are machined on the side of the second protrusion. After the second protrusion at the end of the steel beam is inserted into the second insertion slot, bolts are used to pass through the fourth transverse through holes and the fifth transverse through holes, and then connected by nuts. After the connecting groove formed at the other end of the second protrusion is inserted into the steel beam connecting plate, bolts are used to pass through the fifth transverse through holes on the corresponding side, and then connected and fixed by nuts.

7. The construction method for a prefabricated beam-column joint without on-site welding according to claim 6, characterized in that, The steps are as follows: Step 1: Prefabricate steel pipe columns, steel beams, sleeves, top plates, bottom plates, limit connection components, limit support components and corresponding bolts in the factory, and reserve bolt holes at the corresponding positions of the components; Step 2: Weld the first protrusion to the steel pipe column, and the second protrusion to the steel beam; weld the top plate and bottom plate to the side of the sleeve respectively, and weld the eight L-shaped corner plates to the upper and lower ends of the sleeve; weld the steel pipe column connecting plate, diagonal brace, and steel beam connecting plate to form a limiting support assembly; weld the transition corner plate to the transverse connecting plate; and weld the M-shaped transition plate, transverse plate, and buckle plate to form a fastener assembly. Step 3: Transport the welded steel pipe columns with the first protrusion, the intermediate connecting parts between beams and columns, the steel beams with the second protrusion, and other accessories to the construction site. Step 4: Vertically insert the first protrusion of the upper and lower steel pipe columns into the first insertion groove of the steel pipe column connection part, and connect the steel pipe columns to the steel pipe column connection part using through bolts; Step 5: Insert the second protrusion of the steel beam horizontally into the second insertion slots on the top plate and the bottom plate, and connect the steel beam to the side of the top plate and the side of the bottom plate with through bolts; Step 6: Insert the steel beam connecting plate of the limiting support assembly into the connecting groove at the upper end of the steel beam and connect it with the through bolt. Insert the two steel pipe column connecting plates of the adjacent limiting support assembly into each other, and insert the third protrusion into the third insertion groove at the upper end of the steel pipe column connecting part. Connect the limiting support assembly to the steel pipe column with the through bolt. Step 7: Connect the limiting connection assembly to the sleeve and steel beam respectively with bolts to form an integral structure.

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