Mortise and tenon limiting type beam-column connecting joint for prefabricated assembly type steel structure and mounting method of mortise and tenon limiting type beam-column connecting joint

Abstract

The invention discloses a mortise and tenon limiting type beam-column connecting joint for a prefabricated assembly type steel structure, and belongs to the technical field of structural engineering.The mortise and tenon limiting type beam-column connecting joint comprises a column assembly, an I-beam assembly and a beam-column splicing assembly, and the beam-column splicing assembly comprises an upper flange splicing assembly, a web splicing assembly and a lower flange splicing assembly; the upper flanges of the column assembly and the I-beam assembly are fixedly connected through an upper flange splicing assembly, the webs are fixedly connected through a web splicing assembly, and the lower flanges are fixedly connected through a lower flange splicing assembly. According to the connecting joint, tight connection of the column assembly and the I-shaped beam assembly can be achieved, bolt connection and welding connection are not needed, component limiting is completed through the splicing assemblies and the limiting blocks, and therefore the assemblability of a column and an I-shaped beam in an actual construction site is achieved, the construction problem of connection of the column and the I-shaped beam is greatly solved, and the construction efficiency is improved. And through connection of different beam column splicing assemblies, installation is easier, and manpower waste is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of structural engineering, and particularly relates to the construction of steel structures, and specifically is a mortise and tenon limited beam-column connection node for prefabricated assembled steel structures and an installation method. Background Art

[0002] Prefabricated steel structure system is a building unit or component made according to unified and standard specifications of the Ministry of Construction. It is prefabricated in the factory and then transported to the construction site for assembly. Prefabricated steel structure mostly adopts bolt connection and welding connection. However, both of the above connection methods have certain disadvantages: for welding connection, there are problems such as heat-affected zone, welding deformation, welding stress, and difficulty in disassembly; and for bolt connection, there are problems such as high requirements for workers and labor consumption. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a mortise and tenon limited beam-column connection node for prefabricated assembled steel structures.

[0004] The present invention is achieved through the following technical solutions: A mortise and tenon limited beam-column connection node for a prefabricated assembled steel structure comprises a column component, an I-beam component and a beam-column splicing component.

[0005] The column assembly includes a first vertically arranged I-beam, a horizontally arranged steel corbel is welded and fixed at the weak-axis web of the first I-beam, a cantilever beam is welded and fixed at the position where the top of the steel corbel is connected to the first I-beam, a part of the upper flange of the cantilever beam is removed to make a part of the web protrude, a first web groove is opened on the top of the protruding part of the web, a first rectangular slot is opened in the middle of the protruding part of the web, and a first cross slot is symmetrically opened at the top of the steel corbel at both sides of the outer end of the cantilever beam.

[0006] The I-beam assembly includes a second I-beam, a portion of the upper flange of the second I-beam is removed to make a portion of the web protrude, a second web groove is opened at the top of the protruding portion of the web, a second rectangular slot is opened in the middle of the protruding portion of the web, and a second cross slot is symmetrically opened at the positions of the lower flange of the second I-beam on both sides of the web.

[0007] The beam-column splicing assembly includes an upper flange splicing assembly, a web splicing assembly and a lower flange splicing assembly; the first web groove on the cantilever beam in the column assembly and the second web groove on the second I-beam in the I-beam assembly are connected and fixed through the upper flange splicing assembly; the first rectangular slot hole on the cantilever beam in the column assembly and the second rectangular slot hole on the second I-beam in the I-beam assembly are connected and fixed through the web splicing assembly; the first cross slot hole on the cantilever beam in the column assembly and the second cross slot hole on the second I-beam in the I-beam assembly are connected and fixed through the lower flange splicing assembly.

[0008] Furthermore, the upper flange splicing assembly is provided with a group, which includes a connecting plate, two first U-shaped limit blocks and two first connecting rods; two rectangular grooves are symmetrically provided on the connecting plate, the connecting plate is clamped between the upper flange of the cantilever beam and the upper flange of the second I-beam, and the first web groove and the second web groove respectively pass through the two rectangular grooves on the connecting plate; one of the first U-shaped limit blocks has square through holes on both sides, and the other of the first U-shaped limit blocks has triangular through holes on both sides; one of the first U-shaped limit blocks is supported on the connecting plate and clamped In the first web groove, another first U-shaped limit block is supported on the connecting plate and clamped in the second web groove; a square limit block is provided at one end of the first connecting rod, and a triangular limit block is provided at the other end, and the middle section is a round rod section of the inscribed circle of the triangular limit block; the two first connecting rods are respectively connected between the two sides of the two first U-shaped limit blocks, wherein the square limit block on the first connecting rod is clamped in the square through hole of the first U-shaped limit block, and the triangular limit block on the first connecting rod is clamped in the triangular through hole of the first U-shaped limit block.

[0009] Furthermore, a web splicing assembly is provided with a group, which includes two L-shaped connectors, two limit plates and four triangular limit blocks; a limit groove is provided at the middle position of the short side end of the L-shaped connector, an insert block is vertically fixed at the middle position of the long side end of the L-shaped connector, a limit groove is provided on the insert block, and a slot is provided at the middle position where the long side of the L-shaped connector is connected to the short side; triangular through holes are provided at both ends of the limit plate; the two L-shaped connectors are clamped between the web of the cantilever beam and the web of the second I-beam, and the two L-shaped connectors are butt-jointed together with their heads and tails opposite to each other, wherein one L-shaped connector has The short side and the plug-in block of another L-shaped connector pass through the first rectangular slot on the web of the cantilever beam at the same time, the plug-in block of one L-shaped connector and the short side of another L-shaped connector pass through the second rectangular slot on the web of the second I-beam at the same time, and the plug-in block and slot of one L-shaped connector are respectively plugged in and passed through the slot and plug-in block of another L-shaped connector; a limit plate is inserted between the short side of one L-shaped connector and the limit slot of the plug-in block, and another limit plate is inserted between the short side of another L-shaped connector and the limit slot of the plug-in block, and four triangular limit blocks are respectively inserted in the four triangular through holes of the two limit plates.

[0010] Furthermore, the lower flange splicing assembly is provided with two groups, each group includes two second U-shaped limit blocks, a T-shaped limit block and two second connecting rods, wherein one of the second U-shaped limit blocks has triangular through holes on both sides, the other second U-shaped limit block has square through holes on both sides, and the T-shaped limit block has through holes on the upper and lower sides; a square limit block is provided at one end of the second connecting rod, and a triangular limit block is provided at the other end, and the middle section is a round rod section of the inscribed circle of the triangular limit block; the first cross-shaped slot on the steel corbel and the second I-beam After the second cross-shaped slots on are aligned, the two second U-shaped limit blocks are respectively clamped on both sides of the aligned cross-shaped slots, the T-shaped limit block is clamped between the two second U-shaped limit blocks, and the two second connecting rods are respectively connected between the two sides of the two second U-shaped limit blocks, wherein the square limit block on the second connecting rod is clamped in the square through hole of the second U-shaped limit block, the triangular limit block on the second connecting rod is clamped in the triangular through hole of the second U-shaped limit block, and the round rod segment on the second connecting rod is clamped in the through hole of the T-shaped limit block.

[0011] The present invention also provides a method for installing the above-mentioned mortise and tenon limited beam-column connection node for prefabricated assembled steel structure, comprising the following steps: S1. Column assemblies, I-beam assemblies and beam-column splicing assemblies are welded and assembled in the factory.

[0012] S2. Align the first cross-shaped slot on the steel corbel with the second cross-shaped slot on the second I-beam, and align the web of the cantilever beam with the web of the second I-beam.

[0013] S3. Install the upper flange splicing assembly: install the connecting plate on the protruding part of the web between the upper flange of the cantilever beam and the upper flange of the second I-beam, then install the two first U-shaped limit blocks on the connecting plate and fix them in the first web groove and the second web groove respectively, and finally fix the two first U-shaped limit blocks through the two first connecting rods to complete the installation of the upper flange splicing assembly.

[0014] S4. Install the web splicing assembly: install the first L-shaped connector at the first rectangular slot of the cantilever beam and the second rectangular slot of the second I-beam, and then buckle the second L-shaped connector on the first L-shaped connector to complete the splicing of the two L-shaped connectors; then insert the two limit plates on their corresponding L-shaped connectors respectively, and finally insert the triangular limit block into the triangular through hole of the limit plate to complete the installation of the web splicing assembly.

[0015] S5. Install the lower flange splicing assembly: clamp the two second U-shaped limit blocks in the cross-shaped slots where the steel corbel is aligned with the second I-beam, then insert the T-shaped limit block between the two second U-shaped limit blocks, and finally fix the two second U-shaped limit blocks and the T-shaped limit block through two second connecting rods to complete the installation of the lower flange splicing assembly.

[0016] The connection node of the present invention mainly includes a column assembly, an I-beam assembly and a beam-column splicing assembly. The connection node of the present invention can realize the tight connection of the column assembly and the I-beam assembly, and does not need to adopt bolt connection and welding connection. The component is limited by the splicing assembly and the limit block, thereby realizing the assemblability of the column and the I-beam at the actual construction site, greatly improving the construction problem of the connection between the column and the I-beam, and through the connection of different beam-column splicing assemblies, the installation is simpler and the waste of manpower is reduced.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1) The present invention uses beam-column splicing components to limit the components, thereby achieving beam-column connection and facilitating installation.

[0018] 2) The present invention uses connecting rods, limit blocks, limit plates, etc. as the node form of connecting columns and I-beams, realizes factory manufacturing of various components and on-site splicing and assembly, which can ensure the green and convenient construction process of the prefabricated steel structure system, improve on-site construction efficiency, and save construction time.

[0019] 3) The present invention uses a limit block to limit the plate to prevent the plate from moving; the structure can be disassembled and assembled by releasing the limit block, which has the advantages of easy disassembly and assembly.

[0020] 4) The present invention does not require bolt connection, has low requirements on workers, and saves labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the connection node of the present invention.

[0022] Figure 2 It is a schematic diagram of the explosion structure of the connection node of the present invention.

[0023] Figure 3 It is a schematic diagram of the structure of the column assembly in the connection node of the present invention.

[0024] Figure 4 It is a schematic structural diagram of an I-beam assembly in a connecting node of the present invention.

[0025] Figure 5 This is a schematic diagram of the installation and connection of the upper flange splicing assembly in the connection node of the present invention (a first U-shaped limit block is omitted in the view).

[0026] Figure 6 It is a schematic structural diagram of the connecting plate in the upper flange splicing assembly of the present invention.

[0027] Figure 7 It is a schematic structural diagram of the first U-shaped limiting block in the upper flange splicing assembly of the present invention.

[0028] Figure 8 It is a schematic structural diagram of the first connecting rod in the upper flange splicing assembly of the present invention.

[0029] Fig. 9 This is a schematic diagram of the installation and connection of the web splicing assembly in the connection node of the present invention (the second I-beam is omitted in the view).

[0030] Fig.10 It is a schematic structural diagram of an L-shaped connector in a web splicing assembly of the present invention.

[0031] Fig.11 It is a schematic structural diagram of the splicing of two L-shaped connectors in the web splicing assembly of the present invention.

[0032] Fig.12 It is a schematic structural diagram of a limit plate in a web splicing assembly of the present invention.

[0033] Fig.13 It is a schematic diagram of the structure of the lower flange splicing assembly in the connection node of the present invention.

[0034] Fig.14 It is a structural schematic diagram of a T-shaped limit block in the lower flange splicing assembly of the present invention.

[0035] In the figure: 1-column assembly, 2-I-beam assembly, 3-upper flange splicing assembly, 4-web splicing assembly, 5-lower flange splicing assembly, 6-connecting plate, 7-first U-shaped limit block, 8-first connecting rod, 9-L-shaped connecting member, 10-limiting plate, 11-triangular limit block, 12-second U-shaped limit block, 13-T-shaped limit block, 14-second connecting rod, 15-first web groove, 16-first rectangular slot, 17-first cross slot, 18-second web groove, 19-second rectangular slot, 20-second cross slot, 21-first I-beam, 22-steel corbel, 23-cantilever beam, 24-second I-beam, 25-square limit block, 26-limit slot, 27-insert block, 28-slot. DETAILED DESCRIPTION

[0036] The present invention is further illustrated by the following examples, but is not limited to the following examples.

[0037] In order to more clearly illustrate the technology and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention. Example 1

[0038] like Figures 1 to 14 As shown, this embodiment provides a mortise and tenon limited beam-column connection node for prefabricated assembled steel structure, including a column assembly 1, an I-beam assembly 2 and a beam-column splicing assembly, the structure of which is as shown in FIG. Figure 1 and Figure 2 shown.

[0039] For the column assembly 1, its structure is as follows Figure 3 As shown, the column assembly 1 includes a first I-beam 21 arranged vertically, a horizontally arranged steel corbel 22 is welded and fixed at the weak-axis web of the first I-beam 21, a cantilever beam 23 is welded and fixed at the top of the steel corbel 22 at the position where it is connected to the first I-beam 21, a part of the upper flange of the cantilever beam 23 is removed to make a part of the web protrude, a first web groove 15 is opened on the top of the protruding part of the web, the first web groove 15 is similar to a U-shaped groove, and the opening direction is toward the direction of the first I-beam 21; a first rectangular slot 16 is opened in the middle of the protruding part of the web; the top of the steel corbel 22 is symmetrically opened with first cross-shaped slots 17 at the positions on both sides of the outer end of the cantilever beam 23.

[0040] For the I-beam assembly 2, its structure is as follows Figure 4As shown, the I-beam assembly 2 includes a second I-beam 24, a portion of the upper flange of the second I-beam 24 is removed to allow a portion of the web to protrude, a second web groove 18 is provided at the top of the protruding portion of the web, a second rectangular slot 19 is provided in the middle of the protruding portion of the web, and second cross slots 20 are symmetrically provided at the lower flange of the second I-beam on both sides of the web.

[0041] For beam-column splicing components, the overall structure is as follows Figure 1 and Figure 2 As shown, the beam-column splicing assembly includes an upper flange splicing assembly 3, a web splicing assembly 4 and a lower flange splicing assembly 5; the first web groove 15 on the cantilever beam 23 in the column assembly 1 and the second web groove 18 on the second I-beam 24 in the I-beam assembly 2 are connected and fixed through the upper flange splicing assembly 3; the first rectangular slot 16 on the cantilever beam 23 in the column assembly 1 and the second rectangular slot 19 on the second I-beam 24 in the I-beam assembly 2 are connected and fixed through the web splicing assembly 4; the first cross slot 17 on the cantilever beam 23 in the column assembly 1 and the second cross slot 20 on the second I-beam 24 in the I-beam assembly 2 are connected and fixed through the lower flange splicing assembly 5.

[0042] For the upper flange splicing assembly 3, its structure is as follows Figures 5 to 8 As shown, the upper flange splicing assembly 3 includes a connecting plate 6, two first U-shaped limit blocks 7 and two first connecting rods 8; two rectangular grooves are symmetrically provided on the connecting plate 6, and the connecting plate 6 is clamped between the upper flange of the cantilever beam 23 and the upper flange of the second I-beam 24, and the first web groove 15 and the second web groove 18 respectively pass through the two rectangular grooves on the connecting plate 6; one of the first U-shaped limit blocks 7 has square through holes on both sides, and the other first U-shaped limit block 7 has triangular through holes on both sides; one of the first U-shaped limit blocks 7 is supported on the connecting plate 6 and clamped in the first web groove 1 5, wherein another first U-shaped limit block 7 is supported on the connecting plate 6 and clamped in the second web groove 18; a square limit block 25 is provided at one end of the first connecting rod 8, and a triangular limit block 11 is provided at the other end, and the middle section is a round rod section of the inscribed circle of the triangular limit block 11; the two first connecting rods 8 are respectively connected between the two sides of the two first U-shaped limit blocks 7, wherein the square limit block 25 on the first connecting rod 8 is clamped in the square through hole of the first U-shaped limit block 7, and the triangular limit block 11 on the first connecting rod 8 is clamped in the triangular through hole of the first U-shaped limit block 7.

[0043] For the web splicing assembly 4, its structure is as follows Figures 9 to 12As shown, the web splicing assembly 4 includes two L-shaped connectors 9, two limiting plates 10 and four triangular limiting blocks 11; a limiting groove 26 is provided at the middle position of the short side end of the L-shaped connector 9, and an insert block 27 is vertically fixed at the middle position of the long side end of the L-shaped connector 9, and a limiting groove 26 is provided on the insert block 27, and a slot 28 is provided at the middle position where the long side of the L-shaped connector 9 is connected to the short side; triangular through holes are provided at both ends of the limiting plate 10; the two L-shaped connectors 9 are clamped between the web of the cantilever beam 23 and the web of the second I-beam 24, and the two L-shaped connectors 9 are butt-jointed together with their heads and tails opposite to each other, wherein the short side of one L-shaped connector 9 is connected to the other L-shaped connector. 9's plug-in block 27 passes through the first rectangular slot 16 on the web of the cantilever beam 23 at the same time, the plug-in block 27 of one L-shaped connector 9 and the short side of the other L-shaped connector 9 pass through the second rectangular slot 19 on the web of the second I-beam 24 at the same time, and the plug-in block 27 and slot 28 of one L-shaped connector 9 are respectively plugged and passed with the slot 28 and plug-in block 27 of the other L-shaped connector 9; a limiting plate 10 is inserted between the short side of one L-shaped connector 9 and the limiting groove 26 of the plug-in block 27, and the other limiting plate 10 is inserted between the short side of the other L-shaped connector 9 and the limiting groove 26 of the plug-in block 27, and four triangular limiting blocks 11 are respectively inserted in the four triangular through holes of the two limiting plates 10.

[0044] There are two sets of lower flange splicing components 5, and their structures are as follows: Fig.13 and Fig.14 As shown, each group of lower flange splicing components 5 includes two second U-shaped limit blocks 12, a T-shaped limit block 13 and two second connecting rods 14, wherein one second U-shaped limit block 12 has triangular through holes on both sides, the other second U-shaped limit block 12 has square through holes on both sides, and the T-shaped limit block 13 has through holes on both sides; one end of the second connecting rod 14 is provided with a square limit block 25, and the other end is provided with a triangular limit block 11, and the middle section is a round rod section of the inscribed circle of the triangular limit block 11; the first cross slot 17 on the steel corbel 22 and the twentieth on the second I-beam 24 After the cross-shaped slots 20 are aligned, the two second U-shaped limit blocks 12 are respectively clamped on both sides of the aligned cross-shaped slots, the T-shaped limit block 13 is clamped between the two second U-shaped limit blocks 12, and the two second connecting rods 14 are respectively connected between the two sides of the two second U-shaped limit blocks 12, wherein the square limit block 25 on the second connecting rod 14 is clamped in the square through hole of the second U-shaped limit block 12, the triangular limit block 11 on the second connecting rod 14 is clamped in the triangular through hole of the second U-shaped limit block 12, and the round rod segment on the second connecting rod 14 is clamped in the through hole of the T-shaped limit block 13. Example 2

[0045] This embodiment provides a method for installing the mortise and tenon limited beam-column connection node for a prefabricated assembled steel structure as described in Embodiment 1, comprising the following steps: S1. The column assembly 1, the I-beam assembly 2 and the beam-column splicing assembly are welded and assembled in the factory.

[0046] S2. Align the first cross-shaped slot 17 on the steel corbel 22 with the second cross-shaped slot 20 on the second I-beam 24, and align the web of the cantilever beam 23 with the web of the second I-beam 24.

[0047] S3. Install the upper flange splicing assembly 3: install the connecting plate 6 on the protruding part of the web between the upper flange of the cantilever beam 23 and the upper flange of the second I-beam 24, then install the two first U-shaped limit blocks 7 on the connecting plate 6 and clamp them in the first web groove 15 and the second web groove 18 respectively, and finally fix the two first U-shaped limit blocks 7 through the two first connecting rods 8 to complete the installation of the upper flange splicing assembly 3.

[0048] S4. Install the web splicing assembly 4: install the first L-shaped connector 9 at the first rectangular slot 16 of the cantilever beam 23 and the second rectangular slot 19 of the second I-beam 24, and then buckle the second L-shaped connector 9 on the first L-shaped connector 9 to complete the splicing of the two L-shaped connectors 9; then respectively insert the two limit plates 10 on their corresponding L-shaped connectors 9, and finally insert the triangular limit block 11 into the triangular through hole of the limit plate 10 to complete the installation of the web splicing assembly 4.

[0049] S5. Install the lower flange splicing assembly 5: clamp the two second U-shaped limit blocks 12 into the cross-shaped slots where the steel corbel 22 is aligned with the second I-beam 24, then insert the T-shaped limit block 13 between the two second U-shaped limit blocks 12, and finally fix the two second U-shaped limit blocks 12 and the T-shaped limit block 13 through two second connecting rods 14 to complete the installation of the lower flange splicing assembly 5.

[0050] The above examples of the present invention are only examples for clarifying the present invention, and are not intended to limit the embodiments of the present invention, nor should any drawings be considered as limiting the claims involved. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. Without departing from the purpose of the invention, any structural form similar to the technical solution designed without creativity should be protected by the present invention.

Claims

1. A mortise and tenon limited beam-column connection node for prefabricated assembled steel structure, characterized in that: It comprises a column assembly (1), an I-beam assembly (2) and a beam-column splicing assembly; The column assembly (1) comprises a first I-beam (21) arranged vertically, a steel bracket (22) arranged horizontally is welded and fixed at the weak axis web of the first I-beam (21), a cantilever beam (23) is welded and fixed at the top of the steel bracket (22) at the position where it is connected to the first I-beam (21), a portion of the upper flange of the cantilever beam (23) is removed so that a portion of the web protrudes, a first web groove (15) is opened at the top of the protruding portion of the web, a first rectangular slot (16) is opened in the middle of the protruding portion of the web, and a first cross-shaped slot (17) is symmetrically opened at the top of the steel bracket (22) at positions on both sides of the outer end of the cantilever beam (23); The I-beam assembly (2) comprises a second I-beam (24), a portion of the upper flange of the second I-beam (24) is removed so that a portion of the web protrudes, a second web groove (18) is provided at the top of the protruding portion of the web, a second rectangular slot (19) is provided in the middle of the protruding portion of the web, and second cross-shaped slots (20) are symmetrically provided at the positions of the lower flange of the second I-beam located on both sides of the web; The beam-column splicing assembly comprises an upper flange splicing assembly (3), a web splicing assembly (4) and a lower flange splicing assembly (5); a first web groove (15) on a cantilever beam (23) in the column assembly (1) and a second web groove (18) on a second I-beam (24) in the I-beam assembly (2) are connected and fixed via the upper flange splicing assembly (3); a first rectangular slot hole (16) on a cantilever beam (23) in the column assembly (1) and a second rectangular slot hole (19) on a second I-beam (24) in the I-beam assembly (2) are connected and fixed via the web splicing assembly (4); and a first cross-shaped slot hole (17) on a cantilever beam (23) in the column assembly (1) and a second cross-shaped slot hole (20) on a second I-beam (24) in the I-beam assembly (2) are connected and fixed via the lower flange splicing assembly (5).

2. The mortise and tenon limited beam-column connection node for prefabricated assembled steel structure according to claim 1, characterized in that: The upper flange splicing assembly (3) is provided with a group, which includes a connecting plate (6), two first U-shaped limit blocks (7) and two first connecting rods (8); two rectangular grooves are symmetrically provided on the connecting plate (6); the connecting plate (6) is clamped between the upper flange of the cantilever beam (23) and the upper flange of the second I-beam (24); the first web groove (15) and the second web groove (18) respectively pass through the two rectangular grooves on the connecting plate (6); one of the first U-shaped limit blocks (7) has square through holes on both sides, and another of the first U-shaped limit blocks (7) has triangular through holes on both sides; one of the first U-shaped limit blocks (7) is supported on the connecting plate (6) and clamped in the first web groove (15), wherein another first U-shaped limit block (7) is supported on the connecting plate (6) and is clamped in the second web groove (18); a square limit block (25) is provided at one end of the first connecting rod (8), and a triangular limit block (11) is provided at the other end, and the middle section is a round rod section of the inscribed circle of the triangular limit block (11); the two first connecting rods (8) are respectively connected between the two sides of the two first U-shaped limit blocks (7), wherein the square limit block (25) on the first connecting rod (8) is clamped in the square through hole of the first U-shaped limit block (7), and the triangular limit block (11) on the first connecting rod (8) is clamped in the triangular through hole of the first U-shaped limit block (7).

3. The mortise and tenon limited beam-column connection node for prefabricated assembled steel structure according to claim 2, characterized in that: The web splicing assembly (4) is provided with a group, which includes two L-shaped connecting members (9), two limiting plates (10) and four triangular limiting blocks (11); a limiting groove (26) is provided at the middle position of the short side end of the L-shaped connecting member (9); an insert block (27) is vertically fixed at the middle position of the long side end of the L-shaped connecting member (9); a limiting groove (26) is provided on the insert block (27); a slot (28) is provided at the middle position where the long side of the L-shaped connecting member (9) is connected to the short side; triangular through holes are provided at both ends of the limiting plate (10); the two L-shaped connecting members (9) are clamped between the web of the cantilever beam (23) and the web of the second I-beam (24); the two L-shaped connecting members (9) are butt-jointed with their heads and tails opposite to each other, wherein the short side of one L-shaped connecting member (9) is connected to the insert block of the other L-shaped connecting member (9); The block (27) simultaneously passes through the first rectangular slot (16) on the web of the cantilever beam (23), the plug block (27) of one L-shaped connecting piece (9) and the short side of another L-shaped connecting piece (9) simultaneously pass through the second rectangular slot (19) on the web of the second I-beam (24), and the plug block (27) and the slot (28) of one L-shaped connecting piece (9) are respectively plugged and passed through the slot (28) and the plug block (27) of the other L-shaped connecting piece (9); a limiting plate (10) is inserted between the short side of one L-shaped connecting piece (9) and the limiting slot (26) of the plug block (27), and another limiting plate (10) is inserted between the short side of another L-shaped connecting piece (9) and the limiting slot (26) of the plug block (27), and four triangular limiting blocks (11) are respectively inserted into the four triangular through holes of the two limiting plates (10).

4. The mortise and tenon limited beam-column connection node for prefabricated assembled steel structure according to claim 3, characterized in that: The lower flange splicing assembly (5) is provided with two groups, each group comprising two second U-shaped limit blocks (12), one T-shaped limit block (13) and two second connecting rods (14), wherein one second U-shaped limit block (12) has triangular through holes on both sides, the other second U-shaped limit block (12) has square through holes on both sides, and the T-shaped limit block (13) has through holes on both upper and lower sides; one end of the second connecting rod (14) is provided with a square limit block (25), and the other end is provided with a triangular limit block (11), and the middle section is a round rod section of an inscribed circle of the triangular limit block (11); the first cross slot (17) on the steel bracket (22) and the first cross slot (17) on the second I-beam (24) are provided with a square limit block (25) on one end of the second connecting rod (14), and the second cross slot (17) on the second I-beam (24) are provided with a square limit block (25) on one end of the second connecting rod (14), and the second cross slot (17) on the second I-beam (24) are provided with a square limit block (25) on one end of the second connecting rod (14). After the two cross-shaped slots (20) are aligned, the two second U-shaped limit blocks (12) are respectively clamped on both sides of the aligned cross-shaped slots, the T-shaped limit block (13) is clamped between the two second U-shaped limit blocks (12), and the two second connecting rods (14) are respectively connected between the two sides of the two second U-shaped limit blocks (12), wherein the square limit block (25) on the second connecting rod (14) is clamped in the square through hole of the second U-shaped limit block (12), the triangular limit block (11) on the second connecting rod (14) is clamped in the triangular through hole of the second U-shaped limit block (12), and the round rod section on the second connecting rod (14) is clamped in the through hole of the T-shaped limit block (13).

5. A method for installing a mortise and tenon limited beam-column connection node for a prefabricated assembled steel structure as claimed in claim 4, characterized in that: The steps include: S1. The column assembly (1), the I-beam assembly (2) and the beam-column assembly are welded and assembled in the factory; S2. Align the first cross-shaped slot (17) on the steel corbel (22) with the second cross-shaped slot (20) on the second I-beam (24), and align the web of the cantilever beam (23) with the web of the second I-beam (24); S3. Installing the upper flange splicing assembly (3): installing the connecting plate (6) on the protruding portion of the web between the upper flange of the cantilever beam (23) and the upper flange of the second I-beam (24), then installing two first U-shaped limit blocks (7) on the connecting plate (6) and clamping and fixing them in the first web groove (15) and the second web groove (18), respectively, and finally fixing the two first U-shaped limit blocks (7) by two first connecting rods (8), thereby completing the installation of the upper flange splicing assembly (3); S4. Install the web splicing assembly (4): install the first L-shaped connecting piece (9) at the first rectangular slot (16) of the cantilever beam (23) and the second rectangular slot (19) of the second I-beam (24), then buckle the second L-shaped connecting piece (9) on the first L-shaped connecting piece (9) to complete the splicing of the two L-shaped connecting pieces (9); then insert the two limiting plates (10) on the corresponding L-shaped connecting pieces (9), and finally insert the triangular limiting block (11) into the triangular through hole of the limiting plate (10) to complete the installation of the web splicing assembly (4); S5. Install the lower flange splicing assembly (5): clamp the two second U-shaped limit blocks (12) into the cross-shaped slots aligned with the steel bracket (22) and the second I-beam (24), then insert the T-shaped limit block (13) between the two second U-shaped limit blocks (12), and finally fix the two second U-shaped limit blocks (12) and the T-shaped limit block (13) through two second connecting rods (14), thereby completing the installation of the lower flange splicing assembly (5).

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