A detachable floor connection node for modular steel structure and a manufacturing method thereof

Abstract

The present invention discloses a detachable floor connection node for modular steel structure and a manufacturing method thereof. The connection node includes a modular ceiling, a modular floor and a ceiling beam connection assembly. The present invention sets a detachable floor connection structure at the joint between adjacent modular ceiling beams to enhance the horizontal connection between modular units, thereby solving the problem that the modular steel structure is deformed too much in the plane and the rigidity is insufficient in the floor plane due to the discontinuity of the floor when the modular units on the same floor are spliced; at the same time, the welding part of the connection structure is completed in the factory in advance, and high-strength bolts are used for on-site assembly after transportation to the site, without welding on site, and when the service life of the structure expires and needs to be disassembled, the adjacent modular units can be separated by unscrewing the high-strength bolts. The present invention can take into account the overall force performance of the modular steel structure while giving full play to the advantages of modular building assembly, and ensure the integrity, convenience of construction and disassembly of the modular steel structure.

Description

Technical Field

[0001] The invention belongs to the field of construction engineering, and in particular relates to a detachable floor connection node for a modular steel structure and a manufacturing method thereof. Background Art

[0002] The prefabricated steel structure system is a house unit or component made according to unified and standard building component specifications. It is prefabricated in the factory and then transported to the construction site for assembly. It has the advantages of energy saving and environmental protection, fast construction speed, and high degree of industrialization. The development of industrialized prefabricated steel structure system is an urgent requirement for my country's green building and building industrialization. Modular steel structure is a highly integrated prefabricated building. After the beams, plates, columns, walls and other components in the module units are prefabricated in the factory, the single room is assembled and decorated, and then transported to the project site for stacking and connecting the module units. It has the advantages of short production cycle, low cost, low labor intensity, high quality, green and environmental protection, etc. It is a concentrated embodiment of the advantages of building industrialization and has broad development prospects.

[0003] In order to give full play to the advantages of modular steel structures for rapid on-site installation, the connection nodes between modular units currently only exist at the corner column position, that is, the beam-column node of the traditional structure, and the horizontal force between layers is completely transmitted by the connection nodes. The connection between modular units is mostly connected by corner fittings, and no connection is set at other positions, resulting in discontinuity of the floor and roof panels between modular units of modular steel structures. Due to many factors such as dense urban population, strict control of construction environment and construction area, the demand for high-rise buildings is increasing. Adjacent units of existing modular steel structures are usually only connected at the corner column position, the floor plane is discontinuous, the number of hyperstatics is limited, and the stiffness in the structural plane is insufficient, resulting in poor overall seismic resistance of the structure, which cannot adapt to the development trend and application needs of high-rise modular steel structure buildings.

[0004] As the application scope of modular steel structures in China gradually expands, how to ensure rapid on-site assembly while strengthening the horizontal connection of modular units as much as possible and improving the rigidity of the modular building plane, so that its deformation under horizontal load and horizontal connection force are more uniform, is a key issue that needs to be solved in the high-rise development of modular steel structures. Therefore, the project needs to provide a fully bolted assembled connection node that is easy to construct, can effectively improve the rigidity of the modular steel structure floor plane, and has a low overall cost, so as to improve the stress performance and integrity of the modular steel structure. Summary of the invention

[0005] The present invention aims to overcome the problems of in-plane discontinuity and insufficient in-plane rigidity of existing modular steel structure floors, and to provide a detachable floor connection node and a construction method thereof for modular steel structures which are convenient to construct and have high bearing performance. On the premise of giving full play to the advantages of modular building assembly, the horizontal connection between module units is enhanced, the in-plane rigidity of modular steel structure floors is improved, the integrity of modular steel structures is improved, and the development of high-rise modular steel structures is fully adapted.

[0006] In one aspect, the present invention provides a detachable floor connection node for a modular steel structure, comprising a modular ceiling, a modular floor and a ceiling beam connection assembly; wherein:

[0007] The ceiling beam connection assembly includes a short beam, a beam connection plate, a horizontal connection cover plate and high-strength bolts. The short beam is pre-welded on the ceiling secondary beam, the beam connection plate is pre-welded between the ceiling beam and the short beam, bolt holes are reserved on the beam connection plate, and nuts are fixed with a fixing device at the reserved bolt holes on the inner side of the beam connection plate. The connection of the horizontal connection cover plate is formed between adjacent module ceiling beams that are horizontally butt-jointed, corresponding bolt holes are reserved at corresponding positions on the horizontal connection cover plate and the beam connection plate, and the horizontal connection cover plate and the beam connection plate are connected together by high-strength bolts.

[0008] Furthermore, the bolts are large hexagonal high-strength bolts, and the nuts on the inner side of the beam connecting plate are fixed to the inner reserved bolt holes by a fixing device by spot welding, thereby limiting the free rotation of the nuts and providing installation reaction force.

[0009] Furthermore, the beam connecting plates and the horizontal connecting cover plates are prefabricated in a steel plate factory after being designed with regular cross-sectional dimensions.

[0010] In another aspect, the present invention provides a method for manufacturing the above-mentioned detachable floor connection node for modular steel structure, comprising the following steps:

[0011] Step 1: The factory processes and manufactures modular ceilings, modular floor slabs and ceiling beam connection components, wherein the ceiling beam connection components include short beams, beam connection plates, horizontal connection cover plates, and high-strength bolts, wherein corresponding bolt holes are reserved on the beam connection plates and the horizontal connection cover plates, nuts are welded at the reserved bolt holes on the inner side of the beam connection plates, the short beams are pre-welded to the ceiling secondary beams, and the beam connection plates are pre-welded to the corresponding positions on the horizontally butted ceiling beams;

[0012] Step 2: Install the ceiling beam connection assembly. The horizontal connection cover plate is connected between the adjacent module ceiling beams that are horizontally butt-jointed. Corresponding bolt holes are reserved on the beam connection plate and the horizontal connection cover plate. The nuts are welded and fixed together at the reserved bolt holes on the inner side of the beam connection plate. During assembly, high-strength bolts are passed through the bolt holes of the beam connection plate and the horizontal connection cover plate to be connected. The position is fine-tuned to align the nut with the screw rod for preliminary tightening. Then, a torque wrench is used to perform the final unilateral tightening on the bolt head.

[0013] Step 3: After the module units are stacked, a ceiling beam connection assembly is arranged at the beam end and the mid-span respectively, which can easily combine the unconnected module unit floors.

[0014] Furthermore, when components of the structure need to be replaced during its service life or when it needs to be disassembled after its service life expires, the bolt rods are unscrewed and the structure is disassembled by loosening the bolts.

[0015] Furthermore, step 1 of the manufacturing method further includes the manufacturing of the beam connection plate and the horizontal connection cover plate, including: after designing a regular cross-sectional size, cutting a rectangular plate from a rectangular steel plate to prepare a beam connection plate and a horizontal connection cover plate respectively; setting corresponding bolt holes on the horizontal connection cover plate and on the corresponding module ceiling beam, and fixing nuts on the inner side of the beam connection plate at the reserved bolt holes with a fixing device by spot welding, and the beam connection plate and the horizontal connection cover plate are connected together with large hexagonal high-strength bolts.

[0016] The beneficial effects of the present invention include:

[0017] 1. By setting a detachable floor connection structure at the joints between adjacent module ceiling beams, the horizontal connection between module units is enhanced, which solves the problem of excessive deformation of the module steel structure in the plane and insufficient rigidity in the floor plane caused by discontinuous floor slabs when the module units on the same floor are spliced, thereby enhancing the overall robustness of the structure;

[0018] 2. All structural components are prefabricated, and the welding parts of the connection structure are completed in the factory in advance. After being transported to the site, they are assembled on site with high-strength bolts. The site is fully bolted, realizing no welding operations on site, which greatly improves the construction speed and quality;

[0019] 3. The connection structure is easy to disassemble. By unscrewing the high-strength bolts, the adjacent module units can be separated, which is convenient for post-earthquake repair and replacement of damaged components, and also convenient for disassembly after the service life of the structure expires, which conforms to the design concept of sustainable development of green buildings;

[0020] 4. The connection method of full bolt assembly connection using high-strength bolts is realized, which not only ensures the bearing performance of the connection, but also improves the performance and economy of use. It can improve the overall stress performance of the modular steel structure under the premise of giving full play to the advantages of modular building assembly, and ensure the integrity of the modular steel structure, the convenience of construction and the disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a three-dimensional decomposition structure of a structure according to an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of a three-dimensional structure of a ceiling according to an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the structure of a ceiling beam connection assembly according to an embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure decomposition of a ceiling beam connection assembly according to one embodiment of the present invention;

[0025] Figure 5 A schematic diagram of a beam connecting plate structure according to an embodiment of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of horizontally connected cover plates according to an embodiment of the present invention.

[0027] The attached drawings are marked with: 1. ceiling beam connection assembly, 11. short beam, 12. beam connection plate, 13. horizontal connection cover plate, 14. high-strength bolts, 15. horizontally connected ceiling beams, 16. ceiling secondary beams, 17. nuts, 18. bolt holes. DETAILED DESCRIPTION

[0028] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0029] In one embodiment of the present invention, Figure 1 to Figure 6 As shown, a detachable floor connection node for modular steel structure includes a modular ceiling 100, a modular floor slab 200 and a ceiling beam connection assembly 110; wherein:

[0030] The ceiling beam connection assembly 110 includes a short beam 11, a beam connection plate 12, a horizontal connection cover plate 13 and a high-strength bolt 14, wherein the short beam 11 is pre-welded on the ceiling secondary beam 16, and the beam connection plate 12 is pre-welded between the ceiling beam 15 and the short beam 11 that are horizontally butted, a bolt hole 18 is reserved on the beam connection plate 12, and a nut 17 is fixed by a fixing device at the reserved bolt hole 18 on the inner side of the beam connection plate 12, and the horizontal connection cover plate 13 is connected between adjacent module ceiling beams 15 that are horizontally butted, and corresponding bolt holes 18 are reserved at corresponding positions on the horizontal connection cover plate 13 and the beam connection plate 12, and the horizontal connection cover plate 13 and the beam connection plate 12 are connected together by high-strength bolts 14;

[0031] The high-strength bolts 14 are large hexagonal high-strength bolts, and the nuts on the inner side of the beam connecting plate 12 are fixed to the inner reserved bolt holes 18 by spot welding to limit the free rotation of the nuts and provide installation reaction force;

[0032] The beam connection plate 12 and the horizontal connection cover plate 13 are designed with regular cross-sectional dimensions and are cut from rectangular steel plates to form rectangular cover plates. Corresponding bolt holes 18 are reserved on the beam connection plate. The beam connection plate 12 is pre-welded and connected to the horizontally connected ceiling beam 15 in the factory.

[0033] The method for manufacturing the detachable floor connection node for modular steel structure comprises the following steps:

[0034] (1) According to the design requirements, the modular ceiling 100, the modular floor 200 and the ceiling beam connection assembly 110 are processed and manufactured in the factory. The ceiling beam connection assembly 110 includes a short beam 11, a beam connection plate 12, a horizontal connection cover plate 13, and a high-strength bolt 14. The beam connection plate 12 and the horizontal connection cover plate 13 are provided with corresponding bolt holes 18. The nuts 17 are welded at the bolt holes 18 on the inner side of the beam connection plate 12. The short beam 11 is pre-welded to the ceiling secondary beam 16, and the beam connection plate 12 is pre-welded to the corresponding position of the horizontally connected ceiling beam 15.

[0035] (2) Install the ceiling beam connection assembly 110. The horizontal connection cover plate 13 forms a connection between the adjacent module ceiling beams 15 that are horizontally connected. Corresponding bolt holes 18 are reserved on the beam connection plate 12 and the horizontal connection cover plate 13. Nuts 17 are welded and fixed together at the reserved bolt holes 18 on the inner side of the beam connection plate. During assembly, the high-strength bolts 14 are passed through the beam connection plate 12 and the horizontal connection cover plate 13 to connect. The position is fine-tuned so that the nut and the screw are aligned and initially tightened. Then, a torque wrench is used to perform the final unilateral tightening on the bolt head.

[0036] (3) When components of the structure need to be replaced during its service life or when it needs to be dismantled after its service life expires, the structure can be dismantled by loosening the bolts 14.

[0037] The above step (1) further includes the production of the beam connecting plate 12 and the horizontal connecting cover plate 13, including:

[0038] After the design of regular cross-sectional dimensions, rectangular plates are formed by cutting steel plates, and beam connection plates 12 and horizontal connection cover plates 13 are prepared respectively; corresponding bolt holes 18 are arranged on the beam connection plates 12 and the horizontal connection cover plates 13, and nuts 17 are fixed to the reserved bolt holes on the inner side of the beam connection plates 12 by a fixing device using a spot welding method, and the beam connection plates 12 and the horizontal connection cover plates 13 are connected together by large hexagonal high-strength bolts 14.

[0039] Although the preferred embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, those skilled in the art can make many forms without departing from the scope of protection of the present invention and the claims, all of which belong to the protection scope of the present invention.

Claims

1. A detachable floor connection node for modular steel structure, characterized in that: The invention comprises a module ceiling (100), a module floor (200) and a ceiling beam connection assembly, wherein: the ceiling beam connection assembly (110) comprises a short beam (11), a beam connection plate (12), a horizontal connection cover plate (13) and a high-strength bolt (14); the short beam (11) is pre-welded to a ceiling secondary beam (16); the beam connection plate (12) is pre-welded between a ceiling beam (15) and a short beam (11) that are horizontally butted; a bolt hole (18) is reserved on the beam connection plate (12); a nut (17) is fixed at the reserved bolt hole (18) on the inner side of the beam connection plate (12) by a fixing device; the horizontal connection cover plate (13) is connected between adjacent module ceiling beams (15) that are horizontally butted; corresponding bolt holes (18) are reserved at corresponding positions on the horizontal connection cover plate (13) and the beam connection plate (12); and the horizontal connection cover plate (13) and the beam connection plate (12) are connected together by high-strength bolts (14); The high-strength bolts (14) can be assembled and disassembled using an electric torque wrench, and when disassembly is required, the structure can be disassembled by loosening the high-strength bolts; The beam connection plate (12) and the horizontal connection cover plate (13) are prefabricated in a steel plate factory after being designed with regular cross-sectional dimensions.

2. The connection node according to claim 1, wherein: The high-strength bolts (14) are large hexagonal high-strength bolts, and the nuts on the inner side of the beam connection plate (12) are fixed to the inner reserved bolt holes (18) by a fixing device by spot welding, thereby limiting the free rotation of the nuts and providing installation reaction force.

3. The method for manufacturing and installing a detachable floor connection node for a modular steel structure according to claim 1 or 2, characterized in that: The following steps are involved: Step 1: The modular ceiling (100), modular floor (200) and ceiling beam connection assembly (110) are processed and manufactured in a factory. The ceiling beam connection assembly (110) includes a short beam (11), a beam connection plate (12), a horizontal connection cover plate (13) and a high-strength bolt (14), wherein corresponding bolt holes (18) are reserved on the beam connection plate (12) and the horizontal connection cover plate (13), nuts (17) are welded to the reserved bolt holes (18) on the inner side of the beam connection plate (12), the short beam (11) is pre-welded to the ceiling secondary beam (16), and the beam connection plate (12) is pre-welded to the corresponding position of the horizontally connected ceiling beam (15); Step 2: Install the ceiling beam connection assembly (110), connect the horizontal connection cover plate (13) between the adjacent module ceiling beams (15) that are horizontally connected, reserve corresponding bolt holes (18) on the beam connection plate (12) and the horizontal connection cover plate (13), weld nuts (17) together at the reserved bolt holes (18) on the inner side of the beam connection plate, and during assembly, pass high-strength bolts (14) through the bolt holes of the beam connection plate (12) and the horizontal connection cover plate (13) to connect, fine-tune the position so that the nut and the screw are aligned and tightened initially, and then use a torque wrench to finally tighten the bolt head on one side; Step 3: When the structure needs to be replaced during its service life or needs to be dismantled after its service life expires, the bolt rod is unscrewed and the high-strength bolt (14) is loosened to achieve structural dismantling.

4. The method according to claim 3, wherein step 1 further comprises the production of the beam connection plate (12) and the horizontal connection cover plate (13), comprising: After the regular cross-sectional dimensions are designed, a rectangular plate is formed by cutting a rectangular steel plate, and a beam connection plate (12) and a horizontal connection cover plate (13) are prepared respectively; corresponding bolt holes (18) are arranged on the horizontal connection cover plate (13) and the corresponding module ceiling beam, and nuts (17) are fixed to the inner reserved bolt holes on the inner side of the beam connection plate (12) by a fixing device in a spot welding manner, and the beam connection plate (12) and the horizontal connection cover plate (13) are connected together by large hexagonal high-strength bolts.

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