Steel structure connecting joint, modular steel structure and mounting method of modular steel structure

Abstract

The invention discloses a steel structure connecting joint, which belongs to the technical field of module building engineering and is provided with at least two joint boxes capable of being separated. The connecting plate is arranged between the two node boxes; wherein the node box is provided with a hollow cavity, and a notch for installing a bolt is formed in the same side of the node box; the clamping and locking key is arranged in the hollow cavity; the node boxes are provided with key holes allowing the clamping and locking keys to penetrate through, the connecting plates are provided with lock holes allowing the clamping and locking keys to penetrate through, and after the clamping and locking keys rotate, the clamping and locking keys are coupled with locking pieces which are arranged in the radial direction and can stretch out and draw back, so that the clamping and locking keys and the node boxes are buckled to lock the two adjacent node boxes. The modular steel structure has the beneficial effects that the reliability of connecting joints is high, the overall mechanical property of the modular steel structure is high, and the installation efficiency between the modules is high.

Description

Technical Field

[0001] This invention relates to the field of modular building engineering technology, and in particular to a steel structure connection node, a modular steel structure and its installation method. Background Technology

[0002] Modular construction is a highly prefabricated building form. Modular steel structures are manufactured in factories, with modular units and node components produced before being transported to the site for overall assembly. As a highly efficient structural type in prefabricated construction, its factory prefabrication rate can reach 70%–95%. It is widely used in commercial and residential buildings, emergency medical facilities, military barracks, and residential renovations, offering significant advantages such as short construction cycles, controllable quality, and resource efficiency. To meet the growing demands of the modular construction engineering field, it is essential to ensure the overall mechanical performance of the modular steel structure.

[0003] Individual steel modules possess excellent mechanical properties, but modular steel structures differ from conventional steel frame structures. Modular steel structures are characterized by discrete units and nodes that simultaneously connect multiple beam and column components. To ensure that such structures maintain good overall performance under extreme loads such as earthquakes and explosions, it is necessary to design node forms that combine efficient assembly with superior mechanical properties, thereby improving the overall mechanical performance of the structure.

[0004] Currently, existing modular steel structure beam-column joints are weak and lack overall integrity, severely restricting the structure's ability to withstand stress and deformation. To ensure structural safety, it is necessary to increase the cross-section of components during the design phase, resulting in a significant increase in the amount of steel used. Considering the characteristics of modular steel structures with multiple beams and columns, the design of connection nodes must ensure good connection effects in both the horizontal and vertical directions.

[0005] Secondly, given the need for rapid construction of modular steel structures, the connection nodes must meet the requirements for quick installation. In existing technologies, traditional on-site welding of steel module nodes accounts for more than 20% of the construction period, and the welded steel modules affect construction efficiency and reusability. When steel modules are connected with a large number of bolts, strict control of the hole position deviation is often required, demanding high construction precision. Limited by the narrow installation gaps between steel modules, construction workers find it difficult to perform numerous precise operations during the construction of modular steel structures. Therefore, modular steel structures require simpler and more efficient installation methods. Therefore, in view of the above problems, it is necessary for the present invention to provide a steel structure connection node, a modular steel structure and its installation method. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of the existing technology and provide a steel structure connection node, a modular steel structure and its installation method. First, it solves the problems of poor reliability of the multi-module beam-column connection node and weak overall mechanical performance of the modular steel structure. Second, it addresses the problem of low efficiency in the installation between modules.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses a steel structure connection node, comprising: At least two separable node boxes; and A connecting plate is disposed between the two node boxes; The node box has a hollow cavity, and a notch for mounting bolts is provided on the same side of the node box; it also includes: The locking key is located inside the hollow cavity; The node box has a keyhole through which the locking key can pass, and the connecting plate has a locking hole for the locking key to pass through, and for a retractable locking member that is radially arranged after the locking key rotates to couple with the locking key, so that the locking key and the node box can be fastened and locked to two adjacent node boxes.

[0008] Furthermore, the locking key has multiple key ribs circumferentially formed, and at least one of the key ribs is fitted with the locking member in the middle. The two ends of the key rib adjacent to the locking member have slots for engaging with the node box. The slots have radially extending extensions near the ends of the key ribs for connecting two node boxes.

[0009] Furthermore, the keyhole is provided with a clearance groove to allow the extension section to pass through, and the clearance groove is offset from the positioning hole on the inner wall of the lock hole.

[0010] Furthermore, the bottom end of the locking key is provided with a wrench hole for connecting to a wrench.

[0011] Furthermore, the node box has a process hole on the notch side for communicating with the hollow cavity.

[0012] Furthermore, the node box includes four, and the connecting plate is constructed in a cross shape to space adjacent node boxes. Two horizontally adjacent node boxes are fixedly connected by bolts.

[0013] Furthermore, it also includes a tightening device that can be placed inside the hollow cavity for rotating the bolt inside the hollow cavity.

[0014] Furthermore, the tightening device includes a body, a sleeve rotatably connected to the body, and a transmission rod for driving the sleeve to rotate. The sleeve has a groove that mates with the bolt, and one end of the transmission rod extends to the outside of the node box.

[0015] This invention discloses a modular steel structure, comprising: vertically arranged modular columns, horizontally arranged floor beams, and the aforementioned steel structure connection nodes. The modular columns and the floor beams are fixedly connected to the node boxes by welding to form upper and lower modules.

[0016] This invention also discloses an installation method for a modular steel structure based on the above description, the method comprising the following steps: Step S1, Positioning of the lower module: Ensure that the gap width between two horizontally adjacent lower module columns is equal to the thickness of the connecting plate, and keep the upper surface of the slab beam horizontal; Step S2, horizontal connection of the lower module: insert the connecting plate into the gap; then, insert the horizontal bolt horizontally into the bolt hole through the process hole, and use a tightener and wedge caliper to apply the design preload to complete the horizontal connection of the two lower modules; Step S3, Horizontal connection of the upper modules: Hoist the two upper modules onto the lower module; Horizontally insert the bolts through the process holes and into the bolt holes, and apply the design pre-tightening force using a tightener and wedge calipers to complete the horizontal connection of the two upper modules; Step S4, connection of the upper module and the lower module: insert two vertical bolts into the bolt holes of the two sets of upper and lower modules respectively through the process holes and notches and tighten them; Step S5, Locking and Installing the Locking Key: With the locking parts in a compressed state, insert the locking key into the keyhole from top to bottom until the upper slot of the locking key engages with the upper node box bottom plate and the lower slot engages with the node box bottom plate respectively. Use an Allen wrench to rotate the locking key circumferentially so that its locking parts align with the positioning holes on the connecting plate and spring in, thus locking the locking key and the connecting plate. In the above technical solution, the present invention provides a steel structure connection node, a modular steel structure and its installation method, which have the following advantages: First, the steel structure connection node disclosed in this invention, when two node boxes are stacked and connected, a high-strength bolt and a locking key work together. When four node boxes are connected, the coordinated action of four high-strength bolts and two locking keys realizes multiple constraints and force transmission between the upper and lower, left and right modules. The node connection is reliable, the mechanical performance is excellent, and the mechanical performance of the modular steel structure is improved.

[0017] Secondly, the overall structure of the connection node is simple, easy to process and reusable. During installation, the connection can be completed simply by screwing the high-strength bolts and locking keys into the node box without any additional operations, which greatly simplifies the construction process and effectively reduces the cost and time of the preliminary preparation. The modular steel structure disclosed in this invention has the same beneficial effects as the connection node, which will not be elaborated here. In addition, the modular steel structure installation method of the present invention has clear steps, is easy to operate, can accurately control the bolt preload, is highly adaptable to the construction space, effectively overcomes the limitations of operation in narrow spaces, and thus greatly improves on-site installation efficiency, meeting the core requirements of rapid construction of modular buildings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the steel structure connection node disclosed in this invention; Figure 2 This is an exploded view of the steel structure connection node disclosed in this invention; Figure 3 This is a schematic diagram of the node box structure disclosed in this invention; Figure 4 This is a schematic diagram of the connecting plate structure disclosed in this invention; Figure 5a This is a schematic diagram of the locking key structure disclosed in this invention; Figure 5b This is a schematic diagram of the cross-sectional structure of the locking key disclosed in this invention; Figure 6 This is a schematic diagram of the worm gear wrench structure disclosed in this invention; Figure 7 This is a flowchart of the modular steel structure connection node installation method disclosed in this invention; Figure 8 This is a schematic diagram of step S1 of the modular steel structure connection node installation method disclosed in this invention; Figure 9 This is a schematic diagram of step S2 of the modular steel structure connection node installation method disclosed in this invention; Figure 10 This is a schematic diagram of step S3 of the modular steel structure connection node installation method disclosed in this invention; Figure 11 This is a schematic diagram of step S4 of the modular steel structure connection node installation method disclosed in this invention; Figure 12This is a schematic diagram of step S5 of the modular steel structure connection node installation method disclosed in this invention.

[0020] Explanation of reference numerals in the attached figures: 1. Node box; 1a. First node box; 1b. Second node box; 1c. Third node box; 1d. Fourth node box; 11. Keyhole; 12. Clearance groove; 13. Process hole; 2. Connecting plate; 21. Lock hole; 22. Positioning hole; 3. Locking key; 3a. First locking key; 3b. Second locking key; 31. Key rib; 32. Spring latch; 33. Upper slot; 34. Lower slot; 35. Extension section; 4. Vertical bolt; 4a. First vertical bolt; 4b. Second vertical bolt; 5. Horizontal bolt; 5a. First horizontal bolt; 5b. Second horizontal bolt; 6. Tightener; 61. Sleeve; 62. Drive rod; 7. Allen wrench; 8. Wedge calipers; 100, First floor slab beam; 200, Second floor slab beam; 300, First ceiling beam; 400, Second ceiling beam; 500, First module column; 600, Second module column; 700, Third module column; 800, Fourth module column. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] See Figure 1 , 2 As shown; The invention provides a steel structure connection node, comprising: at least two separable node boxes 1, a connecting plate 2 disposed between the two node boxes 1, and a locking key 3. When there are two node boxes 1, the two node boxes 1a and 1b are stacked vertically and connected by at least one locking key 3 and a bolt. The connecting plate 2 can be constructed in a straight line, separating node boxes 1a and 1b. The node box 1 has a hollow cavity to form an installation and operation space for fixing two adjacent node boxes 1. The node box 1 has a notch on the same side for installing bolts from the side. In this embodiment, all bolts are high-strength bolts. The locking key 3 is set in the hollow cavity. The node box 1 has a keyhole 11 through which the locking key 3 can pass. The connecting plate 2 has a locking hole 21 for the locking key 3 to pass through. After the locking key 3 rotates in the locking hole 21, the radially arranged telescopic locking member of the locking key 3 couples with the locking hole 21, thereby locking the locking key 3 with the node box 1 and locking the two adjacent node boxes 1 to prevent the two stacked node boxes 1 from separating.

[0023] See Figure 2 , 5a As shown in 5b: The locking key 3 has multiple key ribs 31 circumferentially formed, and at least one key rib 31 has a locking element installed in the middle. This locking element is a spring clip 32, or other telescopic rod structures in the prior art. The spring clip 21 is in an uncompressed state in the free state. When pressed by the chamfer of the connecting plate 2, the spring is compressed. The locking key 3 has an upper slot 33 and a lower slot 34 at both ends of the key rib 31 adjacent to the spring clip 32, respectively, for engaging with the node box 1. The slots have radially extending extensions 35 near the ends of the key rib 31. The extensions 35 are larger than the key hole 11 (e.g., Figure 5b As shown), after the locking key 3 rotates, the extension 35 abuts against the upper inner surface of node box 1a and the lower inner surface of node box 1b, respectively, thereby connecting the two node boxes.

[0024] In order for the locking key 3 to pass through the keyhole 11, the keyhole 11 is provided with a relief groove 12 to avoid the extension section 35 so that the locking key 3 can pass through. The relief groove 12 is offset from the positioning hole 22 on the inner wall of the lock hole 21.

[0025] To facilitate the rotation of the locking key 3 within the hollow cavity of the node box 1, the top and bottom edges of the locking key 3 are chamfered, and a wrench hole is provided at the bottom of the locking key 3 for connecting to a wrench. This wrench hole is an internal hexagonal hole. A process hole 13 is provided on the notch side of the node box 1 for communicating with the hollow cavity, so that the wrench can be inserted and the bolts and locking keys can be placed in.

[0026] In a specific embodiment, the first locking key 3a passes sequentially through the locking key holes reserved on the node box 1a, the connecting plate 2, and the second node box 1b. The spring buckle 32 on the first locking key 3a is initially in an uncompressed state. During the rotation of the first locking key 3a in the locking key hole, the spring buckle 32 is in a compressed state. When the spring buckle 32 on the first locking key 3a is engaged with the positioning hole 22 on the inner wall of the locking hole 21 on one side of the connecting plate 2, the spring buckle 32 on the first locking key 3a returns to an uncompressed state. The upper slot 33 on the first locking key 3a is tightly fitted with the upper surface of the bottom plate of the first node box 1a, and the lower slot 33 on the first locking key 3a is tightly fitted with the lower surface of the bottom plate of the second node box 1b.

[0027] See Figure 1 , 2 As shown: In another preferred embodiment, the node box 1 includes four, and the connecting plate 2 is constructed in a cross shape to space adjacent node boxes. Horizontally adjacent node boxes 1a and 1c, and node boxes 1b and 1d are all fixedly connected by horizontal bolts 5a and 5b. Specifically, the vertical bolts 4 and horizontal bolts 5 are preloaded on the outside of the node box using a tightening device 6 and a wedge caliper 8. See Figure 6 As shown: Preferably, the steel structure connection node also includes a tightening device 6, which can be placed inside the hollow cavity for rotating the vertical bolt 4 and the horizontal bolt 5 inside the hollow cavity.

[0028] The tightening device 6 includes a body, on which a sleeve 61 and a transmission rod 62 for driving the sleeve 61 to rotate are rotatably connected. The sleeve 61 has a groove for engaging with a bolt. One end of the transmission rod 62 extends to the outside of the node box 1. Specifically, the transmission rod 62 and the sleeve 61 are driven by a worm gear (e.g., Figure 6 (As shown in Figure b) When in use, the drive transmission rod 62 rotates, which in turn drives the sleeve 61 to rotate, thereby driving the bolt or nut to rotate, so as to achieve the purpose of tightening the bolt.

[0029] See Figure 1 , 2 As shown: The invention also discloses a modular steel structure, including: vertically arranged modular columns, horizontally arranged floor beams, and the above-mentioned steel structure connection nodes. The modular columns and floor beams are fixedly connected to the node box 1 by welding process to form a whole, thereby forming the upper / lower modules.

[0030] For specific embodiments, see Figure 1As shown, the first floor slab beam 100 and the second floor slab beam 200 have the same structure; the first ceiling beam 300 and the second ceiling beam 400 have the same structure; the first modular column 500 and the second modular column 600 have the same structure; and the third modular column 700 and the fourth modular column 800 have the same structure. The first node box 1a and the fourth node box 1d have the same structure; and the second node box 1b and the third node box 1c have the same structure. The four node boxes are arranged in a centrally symmetrical layout, that is, the first node box 1a and the second node box 1b are mirror images of each other, and the third node box 1c and the fourth node box 1d are mirror images of each other.

[0031] Preferably, both the modular columns and floor beams are made of square steel tubes, whose moment of inertia is 15% to 20% higher than that of H-beams of the same cross-section, which can improve the lateral stiffness of the nodes, and the closed cross-section facilitates the welding and fixing of the node boxes.

[0032] See Figure 7-12 As shown: The present invention also discloses an installation method based on the above-mentioned modular steel structure, the method comprising the following steps: Step S1, Positioning of the lower modules: Position the first and second lower modules, ensuring that the gap between the third module column 700 and the fourth module column 800 is equal to the thickness of the connecting plate 13, with an error of ±0.5mm, and that the upper surfaces of the first ceiling beam 400 and the second ceiling beam 400 are level. Figure 8 As shown; Step S2, horizontal connection of the lower modules: Insert the connecting plate 2 into the gap; then, pass the second horizontal bolt 5b sequentially through the bolt holes of the fourth node box 1d, the connecting plate 2, and the second node box 1b, and apply the designed preload using the tightening tool 6 and the wedge caliper 8 to complete the horizontal connection of the two lower modules, as shown. Figure 9 As shown.

[0033] Step S3, horizontal connection of the upper modules: The first and second upper modules are hoisted onto the lower module; the first horizontal bolt 5a is passed sequentially through the bolt holes of the third node box 1c, the connecting plate 2, and the first node box 1a, and pre-tightening force is applied to complete the horizontal connection of the two upper modules. Figure 10 As shown.

[0034] Step S4, connection of the upper and lower modules: Pass the first vertical bolt 4a sequentially through the bolt holes of the first node box 1a, connecting plate 2, and second node box 1b, and tighten them; pass the second vertical bolt 4b sequentially through the bolt holes of the third node box 1c, connecting plate 2, and fourth node box 1d, and tighten them, as follows. Figure 11 As shown.

[0035] Step S5, Locking and Installing the Locking Keys: Insert the first locking key 3a, with the spring clip 32 in a compressed state, into the locking key holes of the first node box 1a, the connecting plate 2, and the second node box 1b, until its upper slot 33 engages with the bottom plate of the first node box 1a and its lower slot 34 engages with the bottom plate of the second node box 1b respectively; use an Allen wrench 7 to insert into the wrench hole of the locking key and rotate the first locking key 3a circumferentially by about 90°, so that its spring clip 32 aligns with the positioning hole 22 on the connecting plate 2 and springs in, thus locking the first locking key 3a and the connecting plate 2; the second locking key 3b is locked in the same way at symmetrical positions, completing the vertical connection of the four modules at the top and bottom, as shown below. Figure 12 As shown.

[0036] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A steel structural connection joint, characterized by, The steel structure connecting node comprises: at least two detachable node boxes (1); and a connecting plate (2) arranged between the two node boxes (1); wherein the node box (1) has a hollow cavity, and an installation bolt opening is formed on the same side of the node box (1); further comprising: a locking key (3) arranged in the hollow cavity; the node box (1) is provided with a key hole (11) through which the locking key (3) can pass, and the connecting plate (2) is provided with a lock hole (21) through which the locking key (3) passes and is coupled with the radially arranged telescopic locking member after the locking key (3) is rotated, so that the locking key (3) is locked with the node box (1) to lock the adjacent two node boxes (1).

2. The steel structure connecting node according to claim 1, wherein: the locking key (3) is circumferentially provided with a plurality of key ribs (31), and at least one of the key ribs (31) is provided with the locking member at the middle portion, and the two ends of the key rib (31) adjacent to the locking member are provided with clamping grooves for clamping with the node box (1), and the clamping grooves are provided with radially extending extension segments (35) near the end portions of the key rib (31) for connecting the two node boxes (1).

3. The steel structure connecting node according to claim 2, wherein: the key hole (11) is provided with an avoiding groove (12) for avoiding the extension segment (35) to pass through, and the avoiding groove (12) is arranged away from the positioning hole (22) on the inner wall of the lock hole (21).

4. The steel structure connecting node according to claim 2, wherein: the bottom end of the locking key (3) is provided with a wrench hole for connecting with a wrench.

5. The steel structure connecting node according to claim 1, wherein: the node box (1) is provided with a process hole (13) on the side of the opening for communicating with the hollow cavity.

6. The steel structure connecting node according to any one of claims 1-5, wherein: the node box (1) comprises four node boxes, and the connecting plate (2) is configured in a cross-shaped structure for spacing the adjacent node boxes (1), and the horizontally adjacent two node boxes (1) are fixedly connected by bolts.

7. The steel structure connecting node according to claim 6, further comprising: a tightening device (6) arranged in the hollow cavity for rotating the bolt inside the hollow cavity.

8. The steel structure connecting node according to claim 7, wherein: the tightening device (6) comprises a body, a sleeve (61) rotatably connected to the body, and a transmission rod (62) for driving the sleeve (61) to rotate, the sleeve (61) is provided with a groove matched with the bolt, and one end of the transmission rod (62) extends to the outside of the node box (1).

9. A modular steel structure, characterized by The steel structure connecting node comprises: vertically arranged module columns, horizontally arranged floor beams, and the steel structure connecting node according to any one of claims 1-8, the module columns and the floor beams are fixedly connected with the node box (1) by welding process to form upper / lower modules.

10. An installation method for a modular steel structure according to claim 9, characterized in that: The method includes the following steps: Step S1, Positioning of the lower module: Ensure that the gap width between two horizontally adjacent lower module columns is equal to the thickness of the connecting plate (2), and keep the upper surface of the slab beam horizontal; Step S2, horizontal connection of the lower module: insert the connecting plate (2) into the gap; then, insert the horizontal bolt (5) horizontally through the process hole (13) into the bolt hole, and use the tightener (6) and wedge caliper (8) to apply the design preload to complete the horizontal connection of the two lower modules; Step S3, horizontal connection of the upper module: hoist the two upper modules onto the lower module; insert the horizontal and vertical (5) through the process hole (13) into the bolt hole, and use the tightener (6) and wedge caliper (8) to apply the design pre-tightening force to complete the horizontal connection of the two upper modules; Step S4, connection of the upper module and the lower module: insert two vertical bolts (4) into the bolt holes of the two sets of upper and lower modules respectively through the process hole (13) and the notch and tighten them; Step S5, Locking and locking of locking key (3): With the locking part in a compressed state, insert the locking key (3) into the key hole (11) from top to bottom until the upper slot (33) of the locking key (3) is engaged with the bottom plate of the upper node box (1) and the lower slot (34) is engaged with the bottom plate of the node box (1). Use an Allen wrench (7) to rotate the locking key (3) circumferentially so that its locking part is aligned with the positioning hole (22) on the connecting plate (2) and springs in. The locking key (3) and the connecting plate (2) are locked.

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