Self-locking node device and modular steel structure

Abstract

The present application discloses a self-locking node device and a modular steel structure, comprising: a lower corner piece, an insert rod and an upper corner piece. The lower corner piece has a threaded hole, the insert rod has a main body section, a stud and a knob fitting portion, the main body section is provided with a reverse tooth portion, the stud and the knob fitting portion are respectively connected to the two ends of the main body section, the stud can be threadedly connected to the threaded hole, and the main body section extends out of the lower corner piece. The upper corner piece has a first cavity, a tightening cylinder and an elastic member, the tightening cylinder is provided in the first cavity, the elastic member is located between the tightening cylinder and the inner wall of the first cavity, the tightening cylinder has a self-locking groove, and the inner wall of the self-locking groove is provided with a reverse tooth groove. When the upper corner piece is installed on the lower corner piece, the insert rod passes through the upper corner piece, the reverse tooth portion and the reverse tooth groove of the self-locking groove are engaged, and the knob fitting portion is located outside the self-locking groove. The self-locking node device of the present application is self-locking and detachable, and has a relatively simple structure, which improves the recycling rate of the steel structure module, reduces the construction difficulty, shortens the construction period, and reduces the cost.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and in particular to a self-locking node device and a modular steel structure. Background Art

[0002] Modular steel structures, as a highly integrated, prefabricated building format, can effectively reduce resource consumption, shorten construction timelines, and improve project quality, making them a worthy standardized building form. Modular construction involves prefabricating one or more building units in a factory and transporting them to the construction site for installation. Each prefabricated module can be a fully furnished room unit, complete with all necessary plumbing, including heating, plumbing, and lighting. Modular units can be used to form complete rooms, parts of larger rooms, or specialized service units such as toilets, elevators, and kitchens. Each modular unit is a complete structural system consisting of top and bottom beams and corner columns. Adjacent modules transfer loads and coordinate deformation through corner joints, allowing multiple units to form a cohesive structure of sufficient size. Therefore, joints are a crucial component of modular construction. Joint installation is a major task on the construction site. Convenient jointing procedures significantly speed up construction. Easily disassembled joints also increase module recyclability and reduce resource consumption.

[0003] Existing modular steel structure connection nodes can be divided into non-detachable nodes and detachable nodes. Non-detachable nodes require the destruction of the original building structure during demolition, making dismantling more difficult. Furthermore, the dismantled boxes cannot be recycled, resulting in a waste of resources. Currently available detachable nodes, which are not self-locking, often use bolt connections, making construction cumbersome and requiring extensive on-site work. Self-locking nodes, on the other hand, are complex, contain numerous precision-machined parts, and require high precision, hindering cost reduction.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The invention provides a self-locking node device and a modular steel structure.

[0006] The present invention adopts the following technical solutions:

[0007] The first object of the present application is to provide a self-locking node device, comprising:

[0008] a lower corner piece, the lower corner piece having a threaded hole;

[0009] An insertion rod having a main body section, a stud and a knob fitting portion, wherein the main body section is provided with an inverted tooth portion, the stud and the knob fitting portion are respectively connected to two ends of the main body section, the stud can be threadedly connected to the threaded hole, and the main body section extends out of the lower corner piece;

[0010] An upper corner piece, the upper corner piece having a first cavity, a tightening cylinder and an elastic member, the tightening cylinder being disposed in the first cavity, the elastic member being disposed in the first cavity and located between the tightening cylinder and the inner wall of the first cavity, the tightening cylinder having a self-locking groove, the inner wall of the self-locking groove being provided with an inverted tooth groove;

[0011] When the upper corner piece is installed on the lower corner piece, the insertion rod passes through the upper corner piece, the inverted tooth portion is engaged with the inverted tooth groove of the self-locking groove, and the knob matching portion is located outside the self-locking groove.

[0012] Optionally, the lower corner piece has a first top plate and a first bottom plate;

[0013] A second cavity is formed between the first top plate and the first bottom plate;

[0014] A first avoidance hole communicating with the second cavity is provided on the first top plate, and the threaded hole is provided on the first bottom plate;

[0015] One end of the plug-in rod stud extends through the first avoidance hole into the second cavity and is threadedly connected to the threaded hole. Optionally, the cross-sectional diameter of the stud is larger than the cross-sectional diameter of the main body section and the knob matching portion.

[0016] Optionally, the tightening cylinder includes at least two single pieces, and the single pieces are enclosed to form the self-locking groove.

[0017] Optionally, the tightening cylinder has a main body portion and an outwardly flared portion;

[0018] The main body is provided with the self-locking groove;

[0019] The outwardly expanded portion has a tapered groove communicating with the self-locking groove;

[0020] The elastic member is disposed between the main body and the inner wall of the first cavity.

[0021] Optionally, the elastic member has a through opening;

[0022] The elastic member is sleeved on the main body through the through opening.

[0023] Optionally, the upper corner piece has a second top plate and a second bottom plate;

[0024] The first cavity is formed between the second top plate and the second bottom plate;

[0025] The second bottom plate is provided with a second avoidance hole, and the second top plate is provided with a third avoidance hole;

[0026] When the upper corner piece is mounted on the lower corner piece, the insertion rod passes through the second avoidance hole and the third avoidance hole.

[0027] Optionally, the self-locking node device further includes a connecting plate, wherein at least two through holes are provided on the connecting plate;

[0028] The connecting plate is arranged between the upper corner piece and the lower corner piece;

[0029] When the upper corner piece is installed on the lower corner piece, the insertion rod is arranged to pass through the through hole.

[0030] Optionally, the connecting plate comprises a main body and a first protrusion and a second protrusion provided on both sides of the main body, and the through hole passes through the first protrusion, the second protrusion and the main body;

[0031] The lower corner piece has a first top plate, and the first top plate is provided with a first avoidance hole;

[0032] The upper corner piece has a second bottom plate, and the second bottom plate is provided with a second avoidance hole;

[0033] When the upper corner piece is mounted on the lower corner piece, the first protrusion is embedded in the first avoidance hole, and the second protrusion is embedded in the second avoidance hole.

[0034] The second object of the present application is to provide a modular steel structure, comprising:

[0035] A plurality of steel structure modules, each of the steel structure modules being stacked to form a multi-layer structure;

[0036] The above-mentioned self-locking node device, wherein the lower corner piece and the upper corner piece of the self-locking node device are respectively connected to two steel structure modules adjacent to each other in the longitudinal direction.

[0037] By adopting the above technical solution, the present invention has the following beneficial effects:

[0038] The self-locking node device of the present application is self-locking, detachable, and has a relatively simple structure, which improves the recycling rate of steel structure modules, reduces construction difficulty, shortens the construction period, and reduces costs.

[0039] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort. In the accompanying drawings:

[0041] Figure 1 It is a structural schematic diagram of the modular steel structure provided in an embodiment of the present application;

[0042] Figure 2 This is a schematic diagram of the partial structure of the modular steel structure provided in an embodiment of the present application;

[0043] Figure 3 is a cross-sectional view of a self-locking node device provided in an embodiment of the present application;

[0044] Figure 4 This is an exploded view of the upper corner piece of the self-locking node device provided in an embodiment of the present application;

[0045] Figure 5 This is an exploded view of the lower corner piece of the self-locking node device provided in an embodiment of the present application;

[0046] Figure 6 This is a structural diagram of a first type of connecting plate of a self-locking node device provided in an embodiment of the present application;

[0047] Figure 7 This is a structural diagram of a second type of connecting plate of a self-locking node device provided in an embodiment of the present application;

[0048] Figure 8 This is a structural diagram of a third type of connecting plate of a self-locking node device provided in an embodiment of the present application;

[0049] Figure 9 This is an exploded view of the tightening cylinder of the self-locking node device provided in an embodiment of the present application;

[0050] Figure 10 Schematic diagram of the three-dimensional structure of the insertion rod of the self-locking node device provided in an embodiment of the present application;

[0051] Figure 11 It is a structural diagram of the handle.

[0052] In the figure, 1. upper corner piece; 11. second top plate; 12. second bottom plate; 13. tightening cylinder; 131. main body; 1311. self-locking groove; 132. outward expansion part; 14. elastic member; 15. second peripheral wall shell; 2. connecting plate; 21. first protrusion; 22. second protrusion; 3. insertion rod; 31. main body section; 32. stud; 33. knob fitting part; 4. lower corner piece; 41. first top plate; 42. first bottom plate; 421. threaded hole; 43. first peripheral wall shell; 5. wrench; 51. rod body; 52. handle; 53. sleeve; 6. column.

[0053] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0055] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0056] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted" and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0057] Example 1

[0058] See also Figures 1 to 11As shown, an embodiment of the present application provides a self-locking node device, comprising: a lower corner piece 4, an insert rod 3 and an upper corner piece 1. The lower corner piece 4 has a threaded hole 421. The insert rod 3 has a main body section 31, a stud 32 and a knob fitting portion 33. The main body section 31 is provided with a reverse tooth portion. The stud 32 and the knob fitting portion 33 are respectively connected to the two ends of the main body section 31. The stud 32 can be threadedly connected to the threaded hole 421. The main body section 31 extends out of the lower corner piece 4. The upper corner piece 1 has a first cavity, a tightening cylinder 13 and an elastic member 14. The tightening cylinder 13 is provided in the first cavity. The elastic member 14 is provided in the first cavity and the elastic member 14 is located between the tightening cylinder 13 and the inner wall of the first cavity. The tightening cylinder 13 has a self-locking groove 1311, and the inner wall of the self-locking groove 1311 is provided with a reverse tooth groove. When the upper corner piece 1 is installed on the lower corner piece 4 , the insertion rod 3 passes through the upper corner piece 1 , the inverted tooth portion is engaged with the inverted tooth groove of the self-locking groove 1311 , and the knob fitting portion 33 is located outside the self-locking groove 1311 .

[0059] In this embodiment of the present application, during node installation, the stud 32 of the insertion rod 3 is first screwed into the threaded hole 421 of the lower corner fitting 4. The upper corner fitting 1 is then placed over the insertion rod 3. The insertion rod 3 passes through the upper corner fitting 1. The inverted teeth on the insertion rod 3 engage with the inverted teeth of the self-locking groove 1311. The knob mating portion 33 is located outside the self-locking groove 1311. At this point, the upper corner fitting 1 and the lower corner fitting 4 are installed. To disassemble, the knob mating portion 33 is tightened with a tool to disengage the insertion rod 3 from the lower corner fitting 4.

[0060] The elastic member 14 elastically presses against the tightening tube 13, and when the insertion rod 3 is inserted into the self-locking groove 1311, the tightening tube 13 is deformed. At this time, the elastic member 14 is in a compressed state, providing elastic force for the tightening tube 13 to reset, so that the tightening tube 13 is tightly sleeved on the insertion rod 3, and the tightening tube 13 and the insertion rod 3 maintain a stable tooth meshing relationship.

[0061] See also Figure 11 As shown, the cross section of the knob fitting portion 33 can be polygonal. For example, the knob fitting portion 33 can be a hexagonal bolt head, which is convenient for twisting the entire plug rod 3 by inserting the wrench 5 on the knob fitting portion 33, thereby achieving efficient disassembly and assembly of the self-locking node device.

[0062] The self-locking node device of the present application is self-locking, detachable, and has a relatively simple structure, which improves the recycling rate of steel structure modules, reduces construction difficulty, shortens the construction period, and reduces costs.

[0063] In one possible embodiment, the lower corner piece 4 has a first peripheral wall shell 43, a first top plate 41, and a first bottom plate 42. The first peripheral wall shell 43 has an upper opening and a lower opening. The first top plate 41 and the first bottom plate are respectively arranged at the upper and lower ends of the first peripheral wall shell 43, respectively closing the upper opening and the lower opening. A second cavity is formed between the first top plate 41 and the first bottom plate 42. A first avoidance hole communicating with the second cavity is provided on the first top plate 41, and the threaded hole 421 is provided on the first bottom plate 42. One end of the stud 32 provided on the insertion rod 3 passes through the first avoidance hole, extends into the second cavity, and is threadedly connected to the threaded hole 421.

[0064] See also Figure 11 As shown, the wrench 5 has a rod body 51, a handle 52 and a sleeve 53, and the sleeve 53 and the handle 52 are respectively located at the two ends of the plate body. When the insertion rod 3 needs to be removed, the sleeve 53 can be sleeved on the knob matching part 33 of the insertion rod 3 to facilitate the screwing of the insertion rod 3.

[0065] When multiple steel structural modules are stacked one above the other, the lower corner fittings 4 and upper corner fittings 1 of the self-locking joint device are typically connected to two adjacent steel structural modules in the longitudinal direction. The cross-sectional diameter of the stud 32 is larger than the cross-sectional diameters of the main body section 31 and the knob mating portion 33. The larger the cross-sectional diameter of the stud 32, the larger the diameter of the threaded hole 421 on the first base plate 42 of the lower corner fitting 4. The socket 53 of the handy wrench 5 can smoothly pass through the threaded hole 421 on the lower corner fitting 4 at the upper portion of the steel structural module, allowing it to be fitted over the stud 32 on the exterior of the upper corner fitting 1 at the lower portion of the steel structural module.

[0066] In a possible embodiment, the tightening cylinder 13 includes at least two single pieces, and the single pieces enclose and form the self-locking groove 1311 .

[0067] In this embodiment, the tightening cylinder 13 is constructed of at least two separate pieces. Under the elastic force of the elastic member 14, the individual pieces converge to clamp the passing insertion rod 3. During the insertion of the upper corner fitting 1 onto the insertion rod 3, the individual pieces separate under the action of the insertion rod 3. After assembly, the elastic members 14 push the individual pieces together and return them to their original positions. The teeth mesh and secure the individual pieces to the insertion rod 3. When the upper corner fitting 1 is subjected to an upward force, the upper corner fitting 1, restrained by the insertion rod 3, does not separate from the lower corner fitting 4.

[0068] In one possible embodiment, see Figure 3 As shown, the tightening cylinder 13 has a main body 131 and an outward expansion portion 132. The main body 131 is provided with the self-locking groove 1311, and the outward expansion portion 132 has a tapered groove communicating with the self-locking groove 1311. The elastic member 14 is provided between the main body 131 and the inner wall of the first cavity.

[0069] It should be noted that each single piece has a partial main body portion 131 and a partial outward expansion portion 132. When each single piece is in a closed state, the outward expansion portion 132 extends toward the circumferential side of the main body portion 131, and the outward expansion portion 132 encloses a tapered groove connected to the self-locking groove 1311. The design of the tapered groove has a guiding function, which is beneficial for the knob matching portion 33 of the insertion rod 3 to smoothly pass through the tapered groove and the self-locking groove 1311, so that the main body section 31 is inserted into the self-locking groove 1311.

[0070] In a possible implementation manner, the elastic member 14 has a through-hole, and the elastic member 14 is sleeved on the main body 131 through the through-hole.

[0071] Along the length of the insertion rod 3, the extension length of the elastic member 14 matches the main body 131, and the lower edge of the elastic member 14 abuts against the outer wall of the outward expansion portion 132. When the upper corner piece 1 is put on the insertion rod 3 and the insertion rod 3 is inserted into the self-locking groove 1311, the individual components are pushed apart and the entire tightening tube 13 is driven to move along the insertion direction of the insertion rod 3. The elastic member 14 abuts against the tapered outer wall of the outward expansion portion 132, which is conducive to squeezing and closing the individual components, so that the tightening tube 13 and the insertion rod 3 fit tightly and facilitate the stable engagement of the two. The elastic member 14 can be a rubber ring. The elastic member 14 can be replaced with other materials that can tighten the tightening tube 13. The shape of the tightening tube 13 can be adjusted according to the actual project to ensure that the various components of the tightening tube 13 can be normally separated and closed during installation.

[0072] In one possible embodiment, the upper corner fitting 1 comprises a second peripheral wall shell 15, a second top plate 11, and a second bottom plate 12. The second top plate 11 and the second bottom plate 12 are disposed at opposite ends of the second peripheral wall shell 15. The first cavity is formed between the second top plate 11 and the second bottom plate 12. The second bottom plate 12 is provided with a second avoidance hole, and the second top plate 11 is provided with a third avoidance hole. When the upper corner fitting 1 is mounted on the lower corner fitting 4, the insertion rod 3 passes through the second and third avoidance holes.

[0073] The self-locking node device also includes a connecting plate 2, which is provided with at least two through holes. The connecting plate 2 is provided between the upper corner piece 1 and the lower corner piece 4. When the upper corner piece 1 is installed on the lower corner piece 4, the insert rod 3 is provided through one of the through holes. The connecting plate 2 can be used to connect two or more adjacent self-locking node devices. For example, see Figure 8 The figure shows a connecting plate 2 for connecting two self-locking node devices. The connecting plate 2 is in the shape of a bar. Figure 7 The figure shows a connecting plate 2 for connecting three self-locking node devices, and the connecting plate 2 is L-shaped. Figure 6Shown is a connecting plate 2 connecting four self-locking node devices, and the connecting plate 2 is square.

[0074] In a possible embodiment, the connecting plate 2 has a main body and a first protrusion 21 and a second protrusion 22 provided on both sides of the main body, and the through hole passes through the first protrusion 21, the second protrusion 22 and the main body. The lower corner piece 4 has a first top plate 41, and the first top plate 41 is provided with a first avoidance hole. The upper corner piece 1 has a second bottom plate 12, and the second bottom plate 12 is provided with a second avoidance hole. When the upper corner piece 1 is installed on the lower corner piece 4, the first protrusion 21 is embedded in the first avoidance hole, and the second protrusion 22 is embedded in the second avoidance hole. The setting of the two protrusions can be respectively embedded in the avoidance holes of the first top plate 41 and the second bottom plate 12, which plays a limiting role and prevents the upper corner piece 1 and the lower corner piece 4 from shifting.

[0075] Example 2

[0076] A second embodiment of the present application provides a modular steel structure, comprising: a plurality of steel structure modules and the self-locking node assembly described in the first embodiment. The steel structure modules are stacked to form a multi-layer structure. The lower corner fittings 4 and upper corner fittings 1 of the self-locking node assembly are respectively connected to two longitudinally adjacent steel structure modules.

[0077] The steel structure module includes columns 6, the upper ends of which are connected to the lower corner fittings 4, and the lower ends of which are connected to the upper corner fittings 1. Columns 6 are hollow in structure. During assembly of this modular steel structure, the rods 3 are first connected to the inner shell of the threaded holes 421 of the lower corner fittings 4 at the top of the lower steel structure module. The connecting plate 2 is then placed over the rods 3, so that the first protrusions 21 of the connecting plate 2 engage with the first clearance holes in the lower corner fittings 4. The upper corner fittings 1 at the bottom of the upper steel structure module are then placed over the rods 3, so that the rods 3 pass through the upper corner fittings 1, thus completing the assembly of the steel structure module.

[0078] When disassembling the steel structure module, a wrench 5 is used to pass through the lower corner piece 4 and the column 6 at the top of the upper steel structure module in turn, and then is put on the knob fitting part 33 of the insertion rod 3 connected to the top of the lower steel structure module. Then, the knob fitting part 33 is rotated to separate the upper corner piece 1 and the lower corner piece 4, thereby completing the disassembly.

[0079] The modular steel structure's modules are self-locking when connected, reducing on-site workload and improving efficiency. They can be disassembled without damaging the original structure, and the disassembled modules can be reused.

[0080] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A self-locking node device, characterized in that: include: a lower corner piece, the lower corner piece having a threaded hole; An insertion rod having a main body section, a stud and a knob fitting portion, wherein the main body section is provided with an inverted tooth portion, the stud and the knob fitting portion are respectively connected to two ends of the main body section, the stud can be threadedly connected to the threaded hole, and the main body section extends out of the lower corner piece; An upper corner piece, the upper corner piece having a first cavity, a tightening cylinder and an elastic member, the tightening cylinder being disposed in the first cavity, the elastic member being disposed in the first cavity and located between the tightening cylinder and the inner wall of the first cavity, the tightening cylinder having a self-locking groove, the inner wall of the self-locking groove being provided with an inverted tooth groove; When the upper corner piece is installed on the lower corner piece, the insertion rod passes through the upper corner piece, the inverted tooth portion is engaged with the inverted tooth groove of the self-locking groove, and the knob matching portion is located outside the self-locking groove; The tightening cylinder includes at least two single pieces, and each of the single pieces encloses and forms the self-locking groove; The tightening cylinder has a main body and an outward expansion portion; The main body is provided with the self-locking groove; The outwardly expanded portion has a tapered groove communicating with the self-locking groove; The elastic member is disposed between the main body and the inner wall of the first cavity.

2. A self-locking node device according to claim 1, characterized in that: The lower corner piece has a first top plate and a first bottom plate; A second cavity is formed between the first top plate and the first bottom plate; A first avoidance hole communicating with the second cavity is provided on the first top plate, and the threaded hole is provided on the first bottom plate; One end of the insertion rod stud extends through the first avoidance hole into the second cavity and is threadedly connected to the threaded hole.

3. A self-locking node device according to claim 2, characterized in that: The cross-sectional diameter of the stud is larger than the cross-sectional diameters of the main body section and the knob mating portion.

4. A self-locking node device according to claim 1, characterized in that: The elastic member has a through opening; The elastic member is sleeved on the main body through the through opening.

5. A self-locking node device according to claim 1, characterized in that: The upper corner piece has a second top plate and a second bottom plate; The first cavity is formed between the second top plate and the second bottom plate; The second bottom plate is provided with a second avoidance hole, and the second top plate is provided with a third avoidance hole; When the upper corner piece is mounted on the lower corner piece, the insertion rod passes through the second avoidance hole and the third avoidance hole.

6. A self-locking node device according to claim 1, characterized in that: Also included is a connecting plate, wherein at least two through holes are provided on the connecting plate; The connecting plate is arranged between the upper corner piece and the lower corner piece; When the upper corner piece is installed on the lower corner piece, the insertion rod is arranged to pass through the through hole.

7. A self-locking node device according to claim 6, characterized in that: The connecting plate comprises a main body and a first protrusion and a second protrusion provided on both sides of the main body, and the through hole passes through the first protrusion, the second protrusion and the main body; The lower corner piece has a first top plate, and the first top plate is provided with a first avoidance hole; The upper corner piece has a second bottom plate, and the second bottom plate is provided with a second avoidance hole; When the upper corner piece is mounted on the lower corner piece, the first protrusion is embedded in the first avoidance hole, and the second protrusion is embedded in the second avoidance hole.

8. A modular steel structure, characterized in that: include: A plurality of steel structure modules, each of the steel structure modules being stacked to form a multi-layer structure; The self-locking node device according to any one of claims 1 to 7, wherein the lower corner piece and the upper corner piece of the self-locking node device are respectively connected to two steel structure modules adjacent to each other in the longitudinal direction.

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