A detachable connection node and construction method for modular steel structure building

Abstract

The present invention proposes a detachable connection node and construction method for modular steel structure buildings. The node is used to complete the horizontal and vertical connection between each module unit, including a module unit corner, a vertical node plate, a connecting plate, a vertical high-strength bolt and a lateral single-sided blind hole bolt; the module unit corner includes a module column and two module beams vertically connected to each other, a horizontal node plate, a tooth groove and a sealing plate; the teeth and grooves between the module columns are engaged with each other during on-site construction, and the vertical node plate and the side wall of the module column are connected through the lateral single-sided blind hole bolt during on-site construction to complete the horizontal connection of the module unit; the horizontal node plate and the connecting plate of the upper module unit and the horizontal node plate of the lower module unit are connected through the vertical high-strength bolt during on-site construction, and the positioning holes on the sealing plate and the positioning heads on the upper and lower surfaces of the connecting plate are inserted and positioned during on-site construction to complete the vertical connection of the module unit.

Description

Technical Field

[0001] The present invention relates to the technical field of steel structures, and in particular to a detachable connection node and a construction method for a modular steel structure building. Background Art

[0002] Solving problems such as environmental pollution, inefficient construction, high labor costs, and long construction periods in the traditional construction industry will be an inevitable choice for the current industry transformation.

[0003] As a higher-level form of prefabricated buildings, modular steel structure buildings can realize a new form of fully-decorated "structure-mechanical-electrical-pipeline" integration. They often use a single module or a single space shaped like a container as the basic unit. After being pre-manufactured in the factory, they are transported to the construction site and hoisted. Thanks to its highly industrialized production model, modular steel structure buildings are low-carbon and environmentally friendly, highly efficient in construction, low in labor costs, and short in construction period.

[0004] Due to the unique production and construction methods of modular buildings, the node connection between modules has different characteristics from traditional nodes: the beam and column components are interrupted and discontinuous. The current design of node connection between modules faces many difficulties: the gap reserved between modules is difficult to meet the construction space requirements for on-site welding and bolting operations; the mechanical properties of nodes with a small number of connecting components such as bolts are poor, and increasing the number will lead to cumbersome on-site splicing and conflict with panel installation; welding and grouting can effectively improve node stiffness, but the process is complicated, the construction quality is unstable, and it is not easy to disassemble; mechanical connection requires high processing and construction precision and is expensive.

[0005] In summary, modular steel structure buildings have broad prospects. The node connection between modules is the force transmission hub of modular steel structure buildings. The industry is in urgent need of developing a node connection between modules that is reliable in force, strong in strength, simple in structure, easy to manufacture, easy to construct, economical and environmentally friendly, so as to apply it to the modular steel structure building industry that is developing in a higher, wider and faster direction, and to help the transformation and upgrading of the construction industry. Summary of the invention

[0006] In order to solve the difficulties in the prior art, the present invention provides a detachable connection node and a construction method for a modular steel structure building.

[0007] To achieve the above object, the present invention is implemented through the following technical solutions:

[0008] In the first aspect, the present invention provides a detachable connection node (hereinafter referred to as "node") for modular steel structure buildings, wherein the detachable connection node is used to complete the horizontal and vertical connection between each module unit, and the detachable connection node includes a module unit corner, a vertical node plate, a connecting plate, a vertical high-strength bolt and a lateral single-sided blind hole bolt; the module unit corner is a corner of the module unit, and each module unit includes 8 module unit corners; the module unit corner includes a module column and two module beams vertically connected to each other, a horizontal node plate, a tooth groove and a sealing plate; the connection between the module column and the module beam adopts a factory welding method; the side of the module beam and the horizontal node plate are welded in advance in the factory; the tooth groove includes teeth and grooves, and the grooves are adjacent to the teeth. The gap between the modules, the outer side of the module column and the teeth are welded in the factory; the sealing plate is arranged at the column end of the module column, and the sealing plate has preset positioning holes; the upper and lower surfaces of the connecting plate are provided with positioning heads; in the horizontal direction, the teeth and grooves between adjacent module columns are engaged with each other during on-site construction, and the vertical node plate and the side wall of the module column are penetrated and connected by the lateral single-sided blind hole bolts during on-site construction to complete the horizontal connection of the module unit; in the vertical direction, the horizontal node plate of the upper module unit, the connecting plate and the horizontal node plate of the lower module unit are penetrated and connected by the vertical high-strength bolts during on-site construction, and the positioning holes on the sealing plate and the positioning heads on the upper and lower surfaces of the connecting plate are inserted and positioned during on-site construction to complete the vertical connection of the module unit.

[0009] Preferably, the module beams and the module columns are both made of cold-bent square steel tubes.

[0010] Preferably, the horizontal node plate is a rectangular steel plate with a thickness greater than the wall thickness of the module beam, and the horizontal node plate is perpendicular to the axial direction of the module column.

[0011] Preferably, the vertical node plate is a rectangular steel plate parallel to the axial direction of the module column.

[0012] Preferably, the sealing plate is arranged at one end where the module column contacts the connecting plate, the thickness of the sealing plate is equal to the wall thickness of the module column, and the outer wall of the sealing plate and the inner wall of the module column are tightly fitted by factory welding.

[0013] Preferably, the teeth in the tooth grooves are elongated steel bars connected to the side surfaces of the module columns that are not connected to the module beams along the axial direction of the module columns.

[0014] Preferably, the height of the teeth is set in the range of 200mm to 400mm; the tooth width on the side of the modular column is less than the groove width on the side of the adjacent modular column by no more than 1mm, so that the teeth and the grooves can fit tightly during on-site construction; the spacing between adjacent modular columns on the same layer is equal to the thickness of the teeth, and the teeth after biting fill the spacing between adjacent modular columns; the total length of the teeth after biting is equal to the side length of the modular column; the number of the teeth is at least 2.

[0015] Preferably, the connecting plate is perpendicular to the axial direction of the module column, the connecting plate is located between the upper module unit and the lower module unit, and the thickness of the connecting plate is equal to 1 to 2 times the wall thickness of the module column.

[0016] Preferably, the preset positioning hole on the sealing plate is a cross-shaped positioning hole, and the positioning heads on the upper and lower surfaces of the connecting plate are cross-shaped positioning heads. The cross-shaped positioning heads are welded or cast in advance on the upper and lower surfaces of the connecting plate in the factory, and the positioning heads have the same shape and size as the positioning holes.

[0017] In a second aspect, the present invention further provides a construction method for a detachable connection node applied to a modular steel structure building according to the first aspect, comprising the following steps:

[0018] (1) Factory manufacturing:

[0019] The module columns, module beams, horizontal node plates, vertical node plates, cover plates, teeth, connection plates, vertical high-strength bolts, and lateral single-side blind hole bolts in the detachable connection nodes are manufactured in a factory;

[0020] (2) Factory welding:

[0021] The module beam is welded to the module column, the outer side wall of the cover plate is welded to the inner side wall of the column end of the module column, the horizontal node plate is welded to the side wall of the module beam, and the teeth are welded to the outer side wall of the module column, thereby obtaining each module unit;

[0022] (3) On-site installation:

[0023] The manufactured module units, vertical node plates, connection plates, vertical high-strength bolts and lateral single-side blind hole bolts are transported to the construction site by means of a carrier, and then sorted and numbered;

[0024] First, position the lower module unit according to the position of the construction drawing, align the teeth and grooves in the module unit corners of the adjacent module units on the same floor, and then drop the module unit to complete the horizontal positioning of all the lower module units in sequence; use a crane to lift the connecting plate to the top of the module column top of the lower module unit, align the positioning head on the lower surface of the connecting plate, and then insert it into the positioning hole of the sealing plate at the column end of the module column of the lower module unit;

[0025] Lift the upper module unit with a crane, align the positioning holes of the sealing plate at the column ends of the module columns of the upper module unit with the positioning heads on the upper surface of the connecting plate positioned above the lower module unit, and then drop the module unit; then lift other adjacent module units on the same floor in turn, align the teeth and grooves between the adjacent module columns, and then drop the modules, and complete the positioning of all the upper module units in turn;

[0026] After the upper module unit and the lower module unit are positioned, the vertical high-strength bolts are passed through the bolt holes opened at the corresponding positions of the horizontal node plate of the upper module unit, the connecting plate, and the horizontal node plate of the lower module unit, and the vertical high-strength bolts are installed after being tightened to complete the vertical connection of each module unit; then, the vertical node plate is aligned with the bolt holes on the column side at the corresponding position of the module column of the same layer, and the lateral single-sided blind hole bolts are passed through the bolt holes in turn, and the lateral single-sided blind hole bolts are installed after being tightened to complete the horizontal connection of each module unit. After all the bolts are installed, the installation of the detachable connection node is completed;

[0027] (4) Node disassembly:

[0028] First, remove the lateral single-sided blind hole bolts and the vertical node plate in sequence, then remove the vertical high-strength bolts in sequence, and finally lift all the upper module units in sequence with a crane and place them on the ground or a transport vehicle, then lift the connecting plate, and then lift the lower module units and place them on the ground or a transport vehicle. Each layer is dismantled in sequence according to the above process to complete the dismantling of the entire building.

[0029] Compared with the prior art, the beneficial effects of the present invention include: the nodes of the present invention can ensure reliable force transmission between adjacent module units of steel structure buildings, and the nodes can be fully assembled on site without welding. The easy disassembly characteristics of the nodes can also enable low-carbon recycling of building modules. It has the advantages of reliable force, high strength, convenient manufacturing, convenient construction, simple structure, energy saving and environmental protection, etc. It can overcome the difficulty of small construction space and is suitable for the connection of the middle and side parts of module units. Specifically:

[0030] (1) The node of the present invention solves the problem of construction space conflict during node installation, and can be applied to both the edge of a module with a larger construction space and the middle of a module with a smaller construction space.

[0031] (2) The nodes of the present invention are constructed without drilling holes on the beam-column components (module columns and module beams), so the components are not weakened, and the vertical node plates and tooth grooves connected on the beam-column components also have a reinforcing effect.

[0032] (3) The node structure of the present invention is simple, the force transmission path is clear, and there is no need for on-site welding. On-site positioning relies on the positioning head, and on-site connection relies on the tooth groove, vertical high-strength bolts and single-sided blind hole bolts. After the module unit is lowered, the bolts can be installed in sequence. The construction process is simple. It solves the problem that the node structure is complex and not conducive to disassembly, and helps to achieve the low-carbon and zero-carbon goals of modular steel structure buildings throughout their life cycle.

[0033] (4) The node of the present invention relies on tooth grooves, single-sided blind hole bolts and vertical high-strength bolts to complete the horizontal and vertical connections between modules. The node can meet the mechanical performance requirements of bending, tension and shear resistance, and ensure the stiffness of the node under different stress conditions.

[0034] (5) In the preferred embodiment, the beam-column components of the node of the present invention are all made of cold-formed square steel tubes, which have symmetrical cross-sections, simple processing, high torsional rigidity, good bearing capacity, smooth appearance, and beautiful building facades.

[0035] (6) In the preferred embodiment, the tooth grooves of the node of the present invention fill the gaps between the module columns, and the space is fully utilized; the tooth grooves are arranged within the node domain (the total length of the teeth after engagement is equal to the side length of the module column), which strengthens the node domain and complies with the design concept of "strong node, weak component"; the tooth grooves can ensure the continuity of the axial force between the module beams, and solve the problem of axial force non-penetration caused by the interruption of the beam components of modular steel structure buildings; the tooth groove structure is simple, the processing is simple, and the cost is low.

[0036] (7) In the preferred embodiment, the square steel tubes, bolts and tooth grooves in the node of the present invention can be adjusted in type, size and quantity according to the situation; the node reserves space for adding stiffening ribs, stiffening plates, inner partitions, diagonal braces and other structures, which can meet the different requirements of actual engineering for node strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is an exploded view of a node in a specific embodiment of the present invention;

[0038] Figure 2 is a schematic diagram of a node after assembly in a specific embodiment of the present invention;

[0039] Figure 3It is a schematic diagram of the corner and node domain components of the module unit in a specific embodiment of the present invention;

[0040] Figure 4 yes Figure 3 Exploded diagram of

[0041] Figure 5 is a schematic diagram of a connecting plate in a specific embodiment of the present invention;

[0042] Among them, 1-module unit corner, 2-horizontal node plate, 3-vertical node plate, 4-sealing plate, 5-tooth groove, 6-connecting plate, 7-vertical high-strength bolt, 8-lateral single-sided blind hole bolt, 11-module column, 12-module beam, 13-bolt hole of module column, 21-bolt hole of horizontal node plate, 22-plate material of horizontal node plate, 41-positioning hole of sealing plate, 42-plate material of sealing plate, 51-teeth of tooth groove, 52-groove of tooth groove, 61-bolt hole of connecting plate, 62-positioning head of connecting plate, 63-plate material of connecting plate. DETAILED DESCRIPTION

[0043] In order to fully demonstrate the technical characteristics, innovative advantages and application effects of the present invention, the following will be combined with the attached Figures 1 to 5 And specific implementation methods are further introduced and explained.

[0044] In the description of the present invention, it should be noted that in order to simply and intuitively present the features of the present invention, the drawings are all simplified and in non-precise proportions.

[0045] It should be noted that the terms "upper", "lower", "horizontal", "vertical", "vertical", "end", "side" and the like indicating orientation or position relationship are for illustrating the orientation or position relationship shown in the drawings and specific embodiments, and are only used as a reference for the illustration and description of the present invention, and are not used as a specific orientation or position that the structure or component must have, and are not restrictive conditions of the present invention.

[0046] It should be noted that the terms "installation", "connection", "welding", "installation", etc. should be understood in a broad sense. For example, "welding" can be a weld connection formed by various welding methods, or it can be an effect equivalent to a welding connection achieved by other operations such as mechanical connection, bolt connection, hinge connection, and internal penetration. Therefore, it cannot be used as a restrictive condition for the implementation of the present invention. Any structural modification and equivalent changes in connection relationship should fall within the scope of the technical content displayed by the present invention. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] like Figure 1-5As shown, this embodiment provides a detachable connection node for modular steel structure buildings, which is used to complete the horizontal and vertical connection between various module units (module unit is the abbreviation of steel structure integrated module unit, which is prefabricated in the factory), including module unit corner 1, vertical node plate 3, connection plate 6, vertical high-strength bolt 7 and lateral single-sided blind hole bolt 8. The module unit corner 1 is a corner of the module unit, and each module unit includes 8 module unit corners; the module unit corner 1 includes a module column 11 and two module beams 12 connected vertically to each other, a horizontal node plate 2, a tooth groove 5 and a sealing plate 4. The connection between the module column 11 and the module beam 12 is welded in the factory. The side of the module beam 12 is welded to the horizontal node plate 2 in advance in the factory. The tooth groove 5 includes a tooth 51 and a groove 52. The groove 52 is the gap between the adjacent teeth 51. The outer side of the module column 11 is welded to the teeth 51 in the factory; the sealing plate 4 is arranged at the column end of the module column, and the sealing plate has a preset positioning hole 41; the upper and lower surfaces of the connecting plate 6 are provided with a positioning head 62; in the horizontal direction, the teeth 51 and the groove 52 between the adjacent module columns 11 are mutually connected during on-site construction. The vertical node plate 3 and the side wall of the module column 11 are interlocked by the lateral single-sided blind hole bolts 8 during on-site construction to complete the horizontal connection of the module unit; in the vertical direction, the horizontal node plate 2 of the upper module unit, the connecting plate 6 and the horizontal node plate 2 of the lower module unit are interlocked by the vertical high-strength bolts 7 during on-site construction, and the positioning holes 41 on the sealing plate 4 and the positioning heads 62 on the upper and lower surfaces of the connecting plate 6 are inserted and positioned during on-site construction to complete the vertical connection of the module unit.

[0048] In a preferred embodiment, both the module beam 12 and the module column 11 are made of cold-bent square steel tubes.

[0049] In a preferred embodiment, the horizontal node plate 2 is a rectangular steel plate with a thickness greater than the wall thickness of the module beam. The horizontal node plate 2 is perpendicular to the axial direction of the module column 11. The two side surfaces of the horizontal node plate 2 are connected to the side surfaces of the two module beams 12 by factory welding. One surface of the horizontal node plate 2 is flush with the surface of the module beam 12. Bolt holes 21 are provided on the surface of the horizontal node plate 2 (the bolt holes 21 on the horizontal node plate are of the same size as the bolt holes 61 on the connecting plate) for connection with vertical high-strength bolts 7 at the construction site. The number of bolt holes 21 is at least 4, but can be increased according to actual conditions such as structural stress.

[0050] In a preferred embodiment, the vertical node plate 3 is a rectangular steel plate parallel to the axial direction of the module column 11. The vertical node plate 3 connects adjacent module columns on the same floor to achieve horizontal connection between module units. Bolt holes are opened on the vertical node plate 3. Correspondingly, the size and hole spacing of the bolt holes are the same as those of the bolt holes 13 opened on the side of the module column 11, which are used for the lateral single-sided blind hole bolts 8 through-connection at the construction site. The number of bolt holes 13 is at least 4, but it can be increased according to actual conditions such as structural stress.

[0051] In a preferred embodiment, the sealing plate 4 is arranged at one end where the module column 11 contacts the connecting plate 6, the thickness of the sealing plate 4 is equal to the wall thickness of the module column 11, and the outer wall of the sealing plate 4 and the inner wall of the module column 11 are tightly fitted by factory welding.

[0052] In a preferred embodiment, the teeth 51 in the tooth grooves 5 are slender steel bars connected to the side of the module column 11 that is not connected to the module beam 12 along the axial direction of the module column 11, and the grooves 52 are gaps between adjacent teeth 51; preferably, the height of the teeth 51 is set within the range of 200 mm to 400 mm; the width of the teeth 51 is less than the width of the grooves 52 reserved on the sides of the adjacent module columns by no more than 1 mm, so as to ensure a tight fit between the teeth 51 and the grooves 52 during on-site construction; the reserved spacing between adjacent module columns on the same floor is equal to the thickness of the teeth 51, and the teeth 51 after biting fill the spacing between adjacent module columns; the total length of the teeth 51 after biting is equal to the side length of the module column 11; the number of teeth 51 is at least 2, which can be increased according to actual conditions such as the column cross-section form.

[0053] In a preferred embodiment, the connecting plate 6 is perpendicular to the axial direction of the module column 11, and is located between the upper module unit and the lower module unit, and its thickness is equal to 1 to 2 times the wall thickness of the module column 11; bolt holes 61 are opened on the connecting plate 6, and the size and hole spacing of the bolt holes 61 are the same as those of the bolt holes 21 on the horizontal node plate, so as to provide a through connection for the vertical high-strength bolts 7 at the construction site.

[0054] In a preferred embodiment, the sealing plate 4 is provided with a cross-shaped positioning hole 41 penetrating the sealing plate plate 42. The upper and lower surfaces of the plate 63 of the connecting plate 6 are provided with a cross-shaped positioning head 62, which is welded or cast on the plate 63 of the connecting plate 6 in advance in the factory. The shape and size of the positioning head 62 are the same as those of the positioning hole 41 of the sealing plate. The connecting plate positioning head 62 is inserted into the positioning hole 41 during on-site construction to realize the positioning function.

[0055] If the connection between the components of the node involves welding operations, they are all completed in advance in the factory, and zero welding construction is achieved on the construction site. The construction method of the detachable connection node applied to the modular steel structure building provided in the specific embodiment of the present invention includes the following steps:

[0056] (1) Factory manufacturing:

[0057] The module columns 11, module beams 12, horizontal node plates 2, vertical node plates 3, cover plates 4, teeth 51, connecting plates 6, vertical high-strength bolts 7, and lateral single-sided blind hole bolts 8 in the nodes are all manufactured in the factory according to the design drawings.

[0058] (2) Factory welding:

[0059] The module beam 12 is welded to the module column 11; the outer wall of the sealing plate 4 is welded to the inner wall of the module column 11; the horizontal node plate 2 is welded to the side wall of the module beam 12; the teeth 51 are welded to the outer wall of the module column 11, thereby obtaining each module unit.

[0060] (3) On-site installation:

[0061] The manufactured module units, vertical node plates, connection plates, vertical high-strength bolts and lateral single-side blind hole bolts are transported to the construction site by means of a carrier, and then sorted and numbered;

[0062] First, move the lower module unit ( Figure 1-2 In the example, 8 module units are included, of which 4 are located at the top, which are the upper module units, and the other 4 are located at the bottom, which are the lower module units. For simplicity, the figure only illustrates the module unit corners in the module units and other components that connect the module units horizontally and vertically) according to the position positioning of the construction drawings, after aligning the teeth 51 and the grooves 52 in the module unit corners 1 of the adjacent module units on the same floor, the module units are dropped to complete the horizontal positioning of all the lower module units in turn; the connecting plate 6 is lifted by a crane to the top of the module column 11 of the lower module unit, and the positioning head 62 on the lower surface of the connecting plate 6 is aligned and inserted into the positioning hole 41 of the sealing plate 4 at the column end of the module column 11 of the lower module unit;

[0063] Use a crane to lift the upper module unit, align the positioning hole 41 of the sealing plate 4 at the column end of the module column 11 of the upper module unit with the positioning head 62 on the upper surface of the connecting plate 6 positioned above the lower module unit, and then drop it; then lift other adjacent module units on the same layer in turn, align the teeth 51 and the grooves 52 between the adjacent module columns 11, and then drop them, so as to complete the positioning of all the upper module units in turn;

[0064] After the upper module unit and the lower module unit are positioned, the vertical high-strength bolts 7 are passed through the bolt holes opened at the corresponding positions of the horizontal node plate 2 of the upper module unit, the connecting plate 6, and the horizontal node plate 2 of the lower module unit, and the vertical high-strength bolts 7 are installed after being tightened to complete the vertical connection of each module unit; then, the vertical node plate 3 is aligned with the bolt holes 13 on the column side at the corresponding position of the module column 11 of the same layer, and the lateral single-sided blind hole bolts 8 are passed through the bolt holes 13 in turn, and the lateral single-sided blind hole bolts 8 are installed after being tightened to complete the horizontal connection of each module unit. After all the bolts are installed, the node installation is completed;

[0065] (4) Node disassembly

[0066] When the modular building reaches the service life requirement, the building can be dismantled, and the most critical thing is the removal of the nodes. In the specific implementation of the present invention, the node connection is only connected by bolts and positioning parts on site, so the dismantling is convenient and non-destructive. The specific dismantling steps are as follows: first remove the lateral single-sided blind hole bolts 8 and remove the vertical node plate 3 in sequence, and then remove the vertical high-strength bolts 7 in sequence. Then, all the upper module units are lifted by a crane in turn and placed on the ground or on a transport vehicle, and then the connecting plate 6 is lifted, and then the lower module units are lifted and placed on the ground or on a transport vehicle. Each layer is dismantled in turn according to the above process to complete the dismantling of the entire building.

[0067] In summary, the specific implementation of the present invention provides a detachable connection node and construction method for modular steel structure buildings. The node has a concise structure, a clear force transmission path, and a simple construction process, which solves the problem of construction space conflict during node installation. It can be applied to the edge and middle nodes of the module, solving the problem that the node structure is complex and not conducive to disassembly, and helps to achieve the low-carbon and zero-carbon goals of modular steel structure buildings throughout their life cycle. The node can meet the mechanical performance requirements of bending, tension and shear resistance, ensure the stiffness under different force conditions, and the reserved construction space can meet the different requirements of actual engineering for node strength.

[0068] In a preferred embodiment, the tooth-groove structure of the node can not only make full use of the reserved gaps between the module columns to maintain the penetration of the axial forces of the beams and columns, but the node also uses lateral and vertical bolts to ensure the multi-dimensional force reliability of the node domain, meet the needs of diversified structural development, achieve zero welding on site, and achieve the goal of low carbon and zero carbon throughout the life cycle of the building, helping my country's construction industry to transform and upgrade.

[0069] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A detachable connection node for modular steel structure building, characterized in that: The detachable connection node is used to complete the horizontal and vertical connection between each module unit, and the detachable connection node includes a module unit corner, a vertical node plate, a connection plate, a vertical high-strength bolt and a lateral single-side blind hole bolt; The module unit corner is a corner of the module unit, and each module unit includes 8 module unit corners; the module unit corner includes a module column and two module beams vertically connected to each other, a horizontal node plate, a tooth groove and a sealing plate; the module beam and the module column are both made of cold-formed square steel pipes; The connection between the module column and the module beam is welded in the factory; the side of the module beam is welded to the horizontal node plate in advance in the factory; the tooth groove includes teeth and grooves, the groove is the gap between adjacent teeth, the teeth are slender steel bars, connected to the side of the module column that is not connected to the module beam along the axial direction of the module column, and the outer side of the module column is welded to the teeth in the factory; the sealing plate is arranged at the column end of the module column, and the sealing plate is preset with a positioning hole; the upper and lower surfaces of the connecting plate are provided with positioning heads; wherein the height of the teeth is set within the range of 200mm to 400mm; the tooth width on the side of the module column is less than the groove width on the side of the adjacent module column by no more than 1mm, so that the teeth and the grooves can fit tightly during on-site construction; the spacing between adjacent module columns on the same layer is equal to the thickness of the teeth, and the teeth after biting fill the spacing between adjacent module columns; the total length of the teeth after biting is equal to the side length of the module column; the number of the teeth is at least 2; In the horizontal direction, the teeth and grooves between adjacent module columns are engaged with each other during on-site construction, and the vertical node plate and the side wall of the module column are connected through the lateral single-sided blind hole bolts during on-site construction to complete the horizontal connection of the module unit; In the vertical direction, the horizontal node plate of the upper module unit, the connecting plate and the horizontal node plate of the lower module unit are connected through the vertical high-strength bolts during on-site construction, and the positioning holes on the sealing plate and the positioning heads on the upper and lower surfaces of the connecting plate are inserted and positioned during on-site construction to complete the vertical connection of the module units.

2. The detachable connection node according to claim 1, characterized in that: The horizontal node plate is a rectangular steel plate, the thickness of which is greater than the wall thickness of the module beam, and the horizontal node plate is perpendicular to the axial direction of the module column.

3. The detachable connection node according to claim 1, characterized in that: The vertical node plate is a rectangular steel plate parallel to the axis direction of the module column.

4. The detachable connection node according to claim 1, characterized in that: The sealing plate is arranged at one end where the module column contacts the connecting plate. The thickness of the sealing plate is equal to the wall thickness of the module column. The outer wall of the sealing plate and the inner wall of the module column are tightly fitted by factory welding.

5. The detachable connection node according to claim 1, characterized in that: The connecting plate is perpendicular to the axial direction of the module column, and is located between the upper module unit and the lower module unit, and the thickness of the connecting plate is equal to 1 to 2 times the wall thickness of the module column.

6. The detachable connection node according to claim 1, characterized in that: The preset positioning holes on the sealing plate are cross-shaped positioning holes, and the positioning heads on the upper and lower surfaces of the connecting plate are cross-shaped positioning heads. The cross-shaped positioning heads are welded or cast in advance on the upper and lower surfaces of the connecting plate in the factory, and the positioning heads have the same shape and size as the positioning holes.

7. A construction method for a detachable connection node applied to a modular steel structure building, using the detachable connection node according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) Factory manufacturing: The module columns, module beams, horizontal node plates, vertical node plates, cover plates, teeth, connection plates, vertical high-strength bolts, and lateral single-side blind hole bolts in the detachable connection nodes are manufactured in a factory; (2) Factory welding: The module beam is welded to the module column, the outer side wall of the cover plate is welded to the inner side wall of the column end of the module column, the horizontal node plate is welded to the side wall of the module beam, and the teeth are welded to the outer side wall of the module column, thereby obtaining each module unit; (3) On-site installation: The manufactured module units, vertical node plates, connection plates, vertical high-strength bolts and lateral single-side blind hole bolts are transported to the construction site by means of a carrier, and then sorted and numbered; First, position the lower module unit according to the position of the construction drawing, align the teeth and grooves in the module unit corners of the adjacent module units on the same floor, and then drop the module unit to complete the horizontal positioning of all the lower module units in sequence; use a crane to lift the connecting plate to the top of the module column top of the lower module unit, align the positioning head on the lower surface of the connecting plate, and then insert it into the positioning hole of the sealing plate at the column end of the module column of the lower module unit; Lift the upper module unit with a crane, align the positioning holes of the sealing plate at the column ends of the module columns of the upper module unit with the positioning heads on the upper surface of the connecting plate positioned above the lower module unit, and then drop the module unit; then lift other adjacent module units on the same floor in turn, align the teeth and grooves between the adjacent module columns, and then drop the modules, and complete the positioning of all the upper module units in turn; After the upper module unit and the lower module unit are positioned, the vertical high-strength bolts are passed through the bolt holes opened at the corresponding positions of the horizontal node plate of the upper module unit, the connecting plate, and the horizontal node plate of the lower module unit, and the vertical high-strength bolts are installed after being tightened to complete the vertical connection of each module unit; then, the vertical node plate is aligned with the bolt holes on the column side at the corresponding position of the module column of the same layer, and the lateral single-sided blind hole bolts are passed through the bolt holes in turn, and the lateral single-sided blind hole bolts are installed after being tightened to complete the horizontal connection of each module unit. After all the bolts are installed, the installation of the detachable connection node is completed; (4) Node disassembly: First, remove the lateral single-sided blind hole bolts and the vertical node plate in sequence, then remove the vertical high-strength bolts in sequence, and finally lift all the upper module units in sequence with a crane and place them on the ground or a transport vehicle, then lift the connecting plate, and then lift the lower module units and place them on the ground or a transport vehicle. Each layer is dismantled in sequence according to the above process to complete the dismantling of the entire building.

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