Beam-column connection node of modular steel structure building and construction method thereof

Abstract

The application relates to a beam-column connecting joint of a modular steel structure building, which comprises an upper left module column, an upper right module column, a lower left module column and a lower right module column. The upper left module column, the upper right module column, the lower left module column and the lower right module column are connected in the horizontal direction of the module unit through a column horizontal connecting kit and are connected in the vertical direction and the side direction of the module unit through a joint plate connecting kit. The beam-column connecting joint of the modular steel structure building solves the problem that, after a steel module building in the current modular steel structure building is additionally provided with a support, the support joint plate and the beam-column joint are at the same place, the traditional method is complex in structure and tedious in installation, the force transmission of the joint connecting area is complex, and the force transmission is unreliable. The beam-column connecting joint of the modular steel structure building is characterized in that the joint plate connecting kit is extended into the beam-column joint, one component is realized, and the beam-column joint connection and the support component and the overall frame connection are simultaneously used for two purposes.

Description

Technical Field

[0001] This invention belongs to the field of modular building technology, and relates to a beam-column connection node of a modular steel structure building and its construction method, particularly to a beam-column support connection node of a modular steel structure building with added lateral support members and its construction method. Background Technology

[0002] Modular steel structure buildings, as a more advanced form of prefabricated construction, can achieve a fully integrated, fully furnished form that combines structure, electromechanical systems, and piping. They typically use individual modules or spaces resembling shipping containers as basic units, prefabricated in a factory, transported to the construction site, and then hoisted into place. Benefiting from its highly industrialized production model, modular steel structure buildings are characterized by low carbon footprint, environmental friendliness, high construction efficiency, low labor costs, and short construction periods.

[0003] Due to the unique production and construction methods of modular buildings, the node connections between modules have characteristics different from traditional nodes: beam-column components are discontinuous, resulting in poor lateral resistance in modular buildings. Therefore, they are rarely used alone in high-rise buildings; instead, buckling-restrained braces (BRBs) are typically added to improve building performance. Buckling-restrained braces (BRBs) are bracing members with good energy dissipation and shear capacity. By rationally designing and adding BRBs to buildings, structural displacement can be reduced and structural stress performance improved, while also enhancing seismic performance. In modular buildings with added BRBs, the reliability of the node area largely determines the building's load-bearing capacity, stiffness, seismic performance, installation efficiency, and design methods.

[0004] In current modular construction, modular beams and columns are connected to form modular units via corresponding connectors. Meanwhile, buckling-restrained braces are fixed to the beams or columns externally at the beam-column joints using bolt groups or welding. While the aforementioned connection methods, both proposed and applied in engineering practice, have their advantages, they also present numerous challenges.

[0005] Firstly, the connection between modular beams and columns, and between modular units and buckling-restrained braces, requires two separate construction steps, resulting in a cumbersome process. Furthermore, the different connection methods lead to unclear stress distribution at the nodes, hindering precise design. The bulky node structure cannot accommodate subsequent replacement of damaged components, violating the principles of green and environmentally friendly design. Bolted connections require high construction precision and ample space, which is detrimental to rapid assembly and may even prevent construction altogether. The force transmission mechanism is relatively complex and not straightforward, resulting in a large workload during the initial design phase and making it difficult to accurately calculate the load-bearing capacity. Welded connections also require significant construction space, and the quality of welds in complex areas cannot be fully guaranteed on-site. Welding also causes significant residual deformation and welding stress, affecting the structural load-bearing capacity, machining accuracy, and dimensional stability. Additionally, stress concentration at the weld-to-workpiece interface can contribute to brittle fracture.

[0006] In summary, modular steel structure buildings have broad prospects. The node connections between modules are the force transmission hubs of modular steel structure buildings. The industry urgently needs to develop a reliable, high-strength, simple, easy-to-manufacture, easy-to-construct, economical and environmentally friendly inter-module node connection to be applied to the modular steel structure building industry, which is developing towards higher, wider and faster directions, and to help the construction industry transform and upgrade. Summary of the Invention

[0007] In view of this, in order to solve the problem that in current modular steel structure buildings, after the steel module building is supported, the support node plate and the beam-column node are in the same place. The traditional method is complicated in construction and cumbersome in installation, resulting in complicated force transmission and unreliable force transmission in the node connection area. The present invention provides a beam-column connection node for modular steel structure buildings and its construction method. By extending the node plate connector into the beam-column node, a single component can simultaneously serve the dual functions of beam-column node connection and connection of the support component to the overall frame.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A beam-column connection node for a modular steel structure building includes an upper left module column, an upper right module column, a lower left module column, and a lower right module column. The upper left module column, the upper right module column, the lower left module column, and the lower right module column are connected horizontally in the module unit through a column horizontal connection kit, and the module unit is connected vertically and laterally in the overall frame through a node plate connector.

[0010] The upper left, upper right, lower left, and lower right module columns all have open sides on opposite sides, with L-shaped side plates on both sides of the openings. A locking block is welded to the column surface opposite to the open side. The column horizontal connection kit includes two limiting locking columns connected by several connecting rods and several sets of locking components whose ends abut against the corresponding limiting locking columns. Two locking slots are provided on the side of the limiting locking column opposite to the corresponding module column. The locking slots engage with the L-shaped side plates on the corresponding module column, making adjacent module columns a combined column that shares the load.

[0011] The node plate connector includes a support plate, L-shaped clamping plates integrally formed and welded to both ends of the support plate, and a connecting plate welded and fixed to the end of the support plate. The support plate and the L-shaped clamping plates at both ends of the support plate cooperate to form an E-shape, and the resulting groove is used to clamp and fix with the L-shaped side plates of the upper and lower module columns.

[0012] Furthermore, the snap-fit ​​component includes a columnar snap-fit ​​post that abuts against the end of the limiting snap-fit ​​post, snap-fit ​​plates welded and fixed to both ends of the snap-fit ​​post, and a support post fixed between the snap-fit ​​plates. The support post is arranged opposite to the snap-fit ​​post, and the side of the snap-fit ​​plate away from the snap-fit ​​post is bent. The support post is welded and fixed to the free end of the snap-fit ​​plate. The bent shape formed by the snap-fit ​​plate is used to snap-fit ​​and fix with the corresponding snap-fit ​​block on the module post.

[0013] Furthermore, the middle part of the support column is constricted, and all support columns between each set of limiting clamps are rotatably connected with rotating rods. That is, the rotating rods are uniformly welded and fixed with clamping rings corresponding to the positions of the support columns, and the clamping rings are engaged with the constricted part of the corresponding support column.

[0014] Furthermore, two sets of stiffening plates perpendicular to each other are integrally welded onto the support plate between the L-shaped plates. Several grouting holes are evenly opened on the stiffening plate and the support plate, and grouting holes are also opened at the bottom of the connecting plate to facilitate the flow of grout.

[0015] Furthermore, frame-shaped positioning plates are welded and fixed on the L-shaped clamps at both ends of the support plate. After the node plate connector is clamped onto the L-shaped side plates of the upper and lower module columns, the positioning plates are placed precisely on the end face of the lower module column for positioning.

[0016] Furthermore, a snap-fit ​​plate is welded and fixed in the middle of the module beam at the top of the adjacent module unit. A lateral support is inserted between the snap-fit ​​plate and the positioning plate on the bottom module column of the corresponding module unit. Two limiting plates are integrally formed and welded to both ends of the lateral support. The slot formed by the two limiting plates is snapped and fixed with the corresponding snap-fit ​​plate and connecting plate.

[0017] The construction method for the beam-column connection nodes of this modular steel structure building includes the following steps:

[0018] S1, Factory prefabrication:

[0019] The modular columns, modular beams, column horizontal connection kits, node plate connectors, snap-fit ​​plates, and lateral support components in the modular unit are all manufactured in the factory according to the design drawings.

[0020] S2, Factory Welding:

[0021] Modular columns and modular beams are welded together to form modular units. Grouting sealing plates are welded to the beam ends and snap-fit ​​plates are welded to the upper part of the modular beams of adjacent modular units.

[0022] S3. On-site installation:

[0023] Place the column horizontal connection kit inside the left and right adjacent module columns, and snap the slot of the limiting card column into the L-shaped side plate of the left and right adjacent module columns. Rotate the rotating rod on the side of the support column in the snap-fit ​​component so that the bent shape formed by the card plate snaps into and fixes with the corresponding card block on the module column. The column horizontal connection kit realizes the horizontal fixed connection of the left and right adjacent module columns. Subsequently, through grouting, the left and right adjacent module columns become a whole.

[0024] After the node plate connector is snapped onto the L-shaped side plate of the upper and lower adjacent module columns, the connecting plate is located between the adjacent module beams. The stiffening plate, support plate and grouting holes on the connecting plate facilitate the flow of grout between the module beams, so that the module beams of the adjacent modules are connected as a whole.

[0025] The slots formed by the limiting plates at both ends of the lateral support are engaged and fixed with the corresponding snap-fit ​​plates and connecting plates, further supporting and fixing the modular unit structure.

[0026] The beneficial effects of this invention are as follows:

[0027] The modular steel structure beam-column connection node disclosed in this invention connects adjacent modular columns horizontally via a horizontal column connection kit, and connects the modular units vertically and laterally within the overall frame via node plate connectors. By extending the node plate connectors into the beam-column node, a single component simultaneously serves as both a beam-column connection and a supporting member connecting to the overall frame, simplifying force distribution and clarifying the force transmission path. Furthermore, the node plate connectors, deeply embedded within the beam-column node, provide a more reliable connection to the overall frame as lateral support members, simplifying the construction. The installation of both the horizontal column connection kit and the node plate connectors is relatively simple and does not require excessively high construction precision. After connecting the modular columns as a whole via the horizontal column connection kit and node plate connectors, grouting is used to fix adjacent modular units into a unified whole, thereby resisting axial forces, shear forces, and bending moments faced by the modular steel structure building. The node structure is simple, and the force transmission is reliable, solving the problems of high construction precision requirements, large construction space affecting interior decoration, complex force transmission in the node connection area, and unreliable force transmission in current modular steel structure building connections.

[0028] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0030] Figure 1 This is a structural schematic diagram of the beam-column connection node of the modular steel structure building of the present invention;

[0031] Figure 2 For the present invention Figure 1 Structural diagram of the beam-column connection node Figure 1 ;

[0032] Figure 3 For the present invention Figure 1 Structural diagram of the beam-column connection node Figure 2 ;

[0033] Figure 4 For the present invention Figure 1 Schematic diagram of the structure of the mid-node plate connector;

[0034] Figure 5 For the present invention Figure 1 Schematic diagram of the horizontal connection kit for the central column;

[0035] Figure 6 For the present invention Figure 5 Schematic diagram of the combined structure of the middle limit pin and the locking component;

[0036] Figure 7 For the present invention Figure 5 Schematic diagram of the middle limiting pin;

[0037] Figure 8 For the present invention Figure 5 Schematic diagram of the structure of the card connector;

[0038] Figure 9 For the present invention Figure 1 A schematic diagram of the installation structure of the middle card block.

[0039] Attached reference numerals: Upper left module column 1, locking block 11, L-shaped side plate 12, upper right module column 2, lower left module column 3, lower right module column 4, column horizontal connection kit 5, limiting locking column 51, locking groove 511, locking component 52, locking column 521, locking plate 522, support column 523, rotating rod 53, locking ring 531, node plate connector 6, support plate 61, L-shaped locking plate 62, connecting plate 63, stiffening plate 64, positioning plate 65, locking plate 7, lateral support component 8, beam end grouting sealing plate 9. Detailed Implementation

[0040] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0041] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0042] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0043] like Figures 1-9The beam-column connection nodes of the modular steel structure building shown are used to complete the horizontal and vertical connections between various module units (module unit is short for steel structure integrated module unit, which is prefabricated in the factory). These include upper left module column 1, upper right module column 2, lower left module column 3, and lower right module column 4. Upper left module column 1, upper right module column 2, lower left module column 3, and lower right module column 4 are connected horizontally in the module unit direction through column horizontal connection kit 5, and the module unit is connected vertically and laterally in the overall frame direction through node plate connector 6.

[0044] The upper left module column 1, upper right module column 2, lower left module column 3, and lower right module column 4 all have open sides, with L-shaped side plates 12 on both sides of the opening. Two rows of protruding locking blocks 11 are welded to the column surfaces opposite to the open sides. The column horizontal connection kit 5 includes two limiting locking columns 51 connected by several connecting rods and several sets of locking parts 52 whose ends abut against the corresponding limiting locking columns 51. Two locking slots 511 are opened on the side of the limiting locking column 51 opposite to the corresponding module column. The locking slots 511 and the locking parts of the L-shaped side plates 12 on the corresponding module column are locked. The connection allows adjacent module columns to form a combined column structure that shares the load. The snap-fit ​​component 52 includes a columnar snap-fit ​​post 521 that abuts against the end of the limiting snap-fit ​​post 51, snap-fit ​​plates 522 welded and fixed to both ends of the snap-fit ​​post 521, and support posts 523 fixed between the snap-fit ​​plates 522. The support posts 523 are positioned opposite to the snap-fit ​​posts 521. The side of the snap-fit ​​plate 522 away from the snap-fit ​​post 521 is bent. The support posts 523 are welded and fixed to the free end of the snap-fit ​​plate 522. The bent shape of the snap-fit ​​plate 522 is used to snap and fix the corresponding snap-fit ​​block 11 on the module column. The middle part of the support posts 523 is constricted. A rotating rod 53 is rotatably connected to all support posts 523 between each group of limiting snap-fit ​​posts 51. That is, snap-fit ​​rings 531 corresponding to the positions of the support posts 523 are evenly welded and fixed to the rotating rods 53. The snap-fit ​​rings 531 snap into the constricted part of the corresponding support post 523.

[0045] The entire column horizontal connection kit 5 is placed inside the module column. Taking the lower left module column 3 and the lower right module column 4 as an example, the column horizontal connection kit 5 is placed between the lower left module column 3 and the lower right module column 4. The slot 511 of the limiting clip 51 is engaged with the L-shaped side plate 12 of the lower left module column 3 and the lower right module column 4. The rotating rod 53 on the side of the support column 523 in the rotating clip 52 makes the bent shape formed by the clip plate 522 engage and fix with the corresponding clip block 11 on the module column. The column horizontal connection kit 5 realizes the fixed connection of the lower left module column 3 and the lower right module column 4 in the horizontal direction. Afterwards, through grouting, the lower left module column 3 and the lower right module column 4 become a whole.

[0046] The node plate connector 6 is used to realize the overall frame connection of the module unit in the vertical and lateral directions. The node plate connector 6 includes a support plate 61, L-shaped clamping plates 62 integrally formed and welded to both ends of the support plate 61, and a connecting plate 63 welded and fixed to the end of the support plate 61. The support plate 61 and the L-shaped clamping plates 62 at both ends of the support plate 61 cooperate to form an E-shape. The formed groove 511 is used to engage and fix with the L-shaped side plates 12 of the upper and lower module columns, which has the effect of limiting and fixing the node connector. Two sets of stiffening plates 64 perpendicular to the support plate 61 are integrally formed and welded on the support plate 61 between the L-shaped clamping plates 62. Several grouting holes are evenly opened on the stiffening plates 64 and the support plate 61. When the module column is grouted and fixed, the grouting holes help the grout flow. A frame-like positioning plate 65 is welded and fixed to the L-shaped clamping plates 62 at both ends of the support plate 61. After the node plate connector 6 is clamped onto the L-shaped side plates 12 of the upper and lower module columns, the positioning plate 65 is positioned precisely on the end face of the lower module column. The bottom of the connecting plate 63 also has grouting holes to facilitate grout flow. After the node plate connector 6 is clamped onto the L-shaped side plates 12 of the upper and lower module columns, the connecting plate 63 is located between adjacent module beams, facilitating the flow of grout between the module beams and connecting the module beams of adjacent modules into a whole. In this way, the corner of the entire module unit uses the node plate connector 6 as the main connecting component. The node plate connector 6 extends into the grouting area of ​​the upper and lower module units in the node area, fixing the surrounding module units into a whole through grouting, thereby resisting the axial force, shear force, and bending moment faced by the modular steel structure building.

[0047] A snap-fit ​​plate 7 is welded and fixed in the middle of the module beam (module ceiling beam) at the top of the adjacent module unit. A lateral support 8 is inserted between the snap-fit ​​plate 7 and the positioning plate 65 on the bottom module column of the corresponding module unit. Two limiting plates are integrally formed and welded to both ends of the lateral support 8. The slot 511 formed by the two limiting plates is snapped and fixed with the corresponding snap-fit ​​plate 7 and connecting plate 63. The lateral support 8 plays a role in further supporting and fixing the module unit structure and enhancing its stability.

[0048] A beam end grouting sealing plate 9 is welded and fixed to the module beam near the module column. The beam end grouting sealing plate 9 is welded to the predetermined position when the I-beam is prefabricated in the factory. The length of the beam end grouting sealing plate 9 is adapted to the length of the connecting plate 63 in the node plate connector 6. The grouting hole on the connecting plate 63 facilitates the flow of grout between the module beams, so that the module beams of adjacent modules are also connected into a whole. The beam end grouting sealing plate 9 has the effect of restricting the range of grout flow. In this way, the grouting area extends to the end of the module beam, increasing the rigidity of the module beam-column connection area.

[0049] The modular beam is an I-section beam with welded steel plates at the beam ends. The form of the beam is not fixed and other modular beams with different cross sections can be used, such as square steel tube beams, channel steel beams, etc.

[0050] The construction method for the beam-column connection nodes of this modular steel structure building includes the following steps:

[0051] S1, Factory prefabrication:

[0052] The modular columns, modular beams, column horizontal connection kits 5, node plate connectors 6, snap-fit ​​plates 7, and lateral support components 8 in the modular unit are all manufactured in the factory according to the design drawings;

[0053] S2, Factory Welding:

[0054] Modular columns and modular beams are welded to form modular units. The beam end grouting sealing plate 9 is welded to the modular beam, and the snap-fit ​​plate 7 is welded to the modular beam on the upper part of the adjacent modular unit.

[0055] S3. On-site installation:

[0056] Place the column horizontal connection kit 5 inside the left and right adjacent module columns, and snap the slot 511 of the limiting clip 51 onto the L-shaped side plate 12 of the left and right adjacent module columns. Rotate the rotating rod 53 on the side of the support column 523 in the snap-fit ​​52 so that the bent shape formed by the clip plate 522 is snapped and fixed with the corresponding clip block 11 on the module column. The horizontal connection of the left and right adjacent module columns is fixed in the horizontal direction through the column horizontal connection kit 5. Afterwards, the left and right adjacent module columns become a whole through grouting.

[0057] After the node plate connector 6 is snapped onto the L-shaped side plate 12 of the lower adjacent module column, the upper module unit is hoisted. The L-shaped side plate 12 of the upper module unit is snapped onto the corresponding node plate connector 6. The connecting plate 63 in the node plate connector 6 is located between the adjacent module beams. The grouting holes on the stiffening plate 64, the support plate 61 and the connecting plate 63 facilitate the flow of grout between the module beams, so that the module beams of the adjacent modules are connected as a whole.

[0058] The slots 511 formed by the limiting plates at both ends of the lateral support member 8 are engaged and fixed with the corresponding snap-fit ​​plate 7 and connecting plate 63, further supporting and fixing the module unit structure.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A beam-column connection node for a modular steel structure building, characterized in that, It includes an upper left module column (1), an upper right module column (2), a lower left module column (3) and a lower right module column (4). The upper left module column (1), the upper right module column (2), the lower left module column (3) and the lower right module column (4) are connected horizontally in the module unit through the column horizontal connection kit (5), and the module unit is connected vertically and laterally in the overall frame through the node plate connector (6). The upper left module column (1), upper right module column (2), lower left module column (3), and lower right module column (4) all have open sides on opposite sides, and the two sides of the opening are L-shaped side plates. A locking block (11) is welded on the column surface opposite to the opening side. The column horizontal connection kit (5) includes two limiting locking columns (51) connected by several connecting rods and several sets of locking parts (52) whose ends abut against the corresponding limiting locking columns (51). Two locking slots (511) are opened on the side of the limiting locking column (51) opposite to the corresponding module column. The locking slots (511) are engaged with the L-shaped side plates on the corresponding module column, so that adjacent modules The column becomes a combined column that shares the load. The snap-fit ​​component (52) includes a columnar snap-fit ​​(521) that abuts against the end of the limiting snap-fit ​​(51), a snap-fit ​​plate (522) welded and fixed to both ends of the snap-fit ​​(521), and a support column (523) fixed between the snap-fit ​​plates (522). The support column (523) is arranged opposite to the snap-fit ​​(521). The side of the snap-fit ​​plate (522) away from the snap-fit ​​(521) is bent. The support column (523) is welded and fixed to the free end of the snap-fit ​​plate (522). The bent shape formed by the snap-fit ​​plate (522) is used to snap-fit ​​and fix with the corresponding snap-fit ​​block (11) on the module column. The node plate connector (6) includes a support plate (61), an L-shaped clamping plate (62) integrally formed and welded to both ends of the support plate (61), and a connecting plate (63) welded and fixed to the end of the support plate (61). The support plate (61) and the L-shaped clamping plate (62) at both ends of the support plate are in an E-shape, and the formed groove is used to be clamped and fixed with the L-shaped side plates (12) of the upper and lower module columns.

2. The beam-column connection node of the modular steel structure building as described in claim 1, characterized in that, The middle part of the support column (523) is constricted. A rotating rod (53) is rotatably connected to all the support columns (523) between each set of limiting pins (51). A retaining ring (531) corresponding to the position of the support column is uniformly welded and fixed on the rotating rod (53). The retaining ring (531) is engaged at the constricted part of the corresponding support column (523).

3. The beam-column connection node of the modular steel structure building as described in claim 2, characterized in that, The support plate (61) between the L-shaped card plates (62) is integrally formed and welded with two sets of stiffening plates (64) perpendicular to the support plate (61). Several grouting holes are evenly opened on the stiffening plate (64) and the support plate (61). Grouting holes for easy flow of grout are also opened at the bottom of the connecting plate (63).

4. The beam-column connection node of the modular steel structure building as described in claim 3, characterized in that, A frame-shaped positioning plate (65) is welded and fixed on the L-shaped clamping plates (62) at both ends of the support plate (61).

5. The beam-column connection node of the modular steel structure building as described in claim 4, characterized in that, A snap-fit ​​plate (7) is welded and fixed in the middle of the module beam at the top of the adjacent module unit. A side support (8) is inserted between the snap-fit ​​plate (7) and the positioning plate (65) on the bottom module column of the corresponding module unit. Two limiting plates are integrally formed and welded at both ends of the side support (8). The slot formed by the two limiting plates is snapped and fixed with the corresponding snap-fit ​​plate and connecting plate.

6. The construction method for beam-column connection nodes of the modular steel structure building as described in claim 5, characterized in that, Includes the following steps: S1, Factory prefabrication: The modular columns, modular beams, column horizontal connection kits (5), node plate connectors (6), snap-fit ​​plates (7), and lateral support components (8) in the modular unit are all manufactured in the factory according to the design drawings; S2, Factory Welding: The modular columns and modular beams are welded together to form a modular unit. The beam end grouting sealing plate (9) is welded onto the modular beam, and the snap-fit ​​plate (7) is welded onto the modular beam on the upper part of the adjacent modular unit. S3. On-site installation: Place the column horizontal connection kit (5) inside the left and right adjacent module columns, and snap the slot (511) of the limiting card column (51) onto the L-shaped side plate (12) of the left and right adjacent module columns. Rotate the rotating rod (53) on the side of the support column (523) in the snap-fit ​​part (52) so that the bent shape formed by the card plate (522) is snapped and fixed with the corresponding card block (11) on the module column. The horizontal connection of the left and right adjacent module columns is fixed in the horizontal direction through the column horizontal connection kit (5). Afterwards, the left and right adjacent module columns become a whole through grouting. After the node plate connector (6) is attached to the L-shaped side plate (12) of the lower adjacent module column, the upper module unit is hoisted. The L-shaped side plate (12) of the upper module unit is attached to the corresponding node plate connector (6). The connecting plate (63) in the node plate connector (6) is located between the adjacent module beams. The grouting holes on the stiffening plate (64), support plate (61) and connecting plate (63) facilitate the flow of grout between the module beams, so that the module beams of the adjacent modules are connected as a whole. The slots (511) formed by the limiting plates at both ends of the lateral support member (8) are engaged and fixed with the corresponding snap-fit ​​plate (7) and connecting plate (63), further supporting and fixing the module unit structure.

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