Post-tensioning modular steel frame assembly joint easy to disassemble and assemble

Abstract

The utility model provides a post-tensioning modular steel frame assembly joint easy to disassemble and assemble, and belongs to the field of modular integrated assembly type houses. Comprising an upper module, a lower module, an inner connecting assembly, an energy dissipation friction plate, a through bolt hole, an inner sleeve, an outer adapter assembly, a beam end butt joint opening, a column end butt joint opening, a split bolt, an adapter opening, an inspection opening, a prestress pull rod, a shear key, a fastening nut, a module beam, a module column and an operation opening formed in the module column, and the prestress pull rod penetrates through the module column and the connecting assemblies. The inner sleeve is composed of a plurality of hollow square tube iron castings and is connected with the prestressed pull rod through a steel plug-in arranged in the module column, and the prestressed pull rod is fixed to the end of the column to achieve inter-column connection. The connecting structure has the advantages that the integrity of an existing modular assembly type building structure is improved, the joint assembly quality is improved, and the anti-seismic energy dissipation capacity and the progressive collapse resistance capacity are improved.

Description

Technical Field

[0001] The utility model belongs to the field of modular integrated prefabricated housing construction, and particularly relates to a post-tensioned modular prefabricated steel frame structure node which is easy to disassemble and assemble. Background Technique

[0002] Modular assembly buildings divide the overall three-dimensional space of a building into various module units. After prefabricating each unit in a factory in advance, only module assembly and decoration work need to be carried out on site. Modular assembly nodes have developed rapidly in China in recent years due to characteristics such as being prefabricable in advance and industrialized production, fast assembly speed, clear load transfer paths, high recycling rate, and environmental friendliness, and have been widely used, and have gradually become a new type of assembly node vigorously promoted by the country. However, since China's prefabricated buildings started relatively late compared with other developed countries, engineering applications have only remained at low-rise buildings or temporary buildings. Problems such as the assembly quality of connection nodes between modules, the seismic performance of connection nodes, the structural integrity, and the anti-progressive collapse ability in multi-story modular steel structure assembly nodes have become a series of difficult points that need to be solved urgently.

[0003] In engineering applications, module assembly units are mostly mass-produced in factories. During on-site construction, only the nodes between modules are needed to complete the splicing and assembly between units, effectively avoiding cumbersome construction processes such as concrete pouring, scaffolding erection, and formwork support. However, in order to balance the assembly efficiency and spatial operability at the construction site, the stiffness and bearing capacity of the nodes between modules are relatively weak compared with traditional buildings, and it is difficult to ensure the bearing performance and integrity after module assembly. In addition, high-rise modular prefabricated systems often have relatively high requirements for structural seismic resistance and lateral force resistance. Under strong winds and strong earthquakes, it is easy to occur the overall instability of the module columns in bending and torsion, shear failure at the beam ends, and horizontal sliding of the overall module units. Therefore, it is necessary to find a steel structure frame module assembly node so that the out-of-plane stiffness of the beam-column node participates in the integration of the overall structure stiffness, thereby effectively controlling the displacements and internal forces of each component in the node area.

[0004] Chinese Patent Application No. CN201910291883.9 discloses a modular steel structure node, which simultaneously fixes the vertical frame column and the frame beam through a space connector; when vertically splicing, the frame beams and frame columns of the two module units are respectively aligned vertically, and the frame columns are simultaneously fixedly connected to the same splicing plate; when horizontally splicing, one frame beam and frame column of two adjacent module units on the same floor are respectively aligned horizontally. This assembly node can achieve a high assembly rate and high splicing efficiency on the premise of meeting the mechanical properties of the node and the overall stability of the modular steel structure. However, due to the existence of the adapter in this structure, there is a large gap between the upper and lower module beams, resulting in a significant reduction in the shear strength of the beam-column connection node. Under the action of the top dead weight and strong earthquakes, shear failure may occur vertically in the beam end and mid-span regions.

[0005] Chinese patent application number CN202223219233.X discloses a modular integrated house, in which the upper module is placed on top of the lower module by a crane, and then the upper module is driven to move by a positioning pulley. When the positioning pulley moves to the inside of the first positioning groove, the upper floor contacts the lower roof, and the deadweight of the positioning pulley drives the connecting shaft to press the control switch. The hydraulic cylinder is controlled by the controller to start and push another positioning pulley to support the upper module. Similarly, the upper and lower modules can be aligned to improve the installation efficiency of the equipment. However, unit positioning only through the slide rail and the internal plug of the upper module column cannot meet the requirements of anti-slip and anti-side between modules. In the multi-layer assembly node, the structure faces the risk of the entire module unit slipping off and falling in the horizontal direction, and the node strength is obviously insufficient. Under the action of external load, it may cause obvious plastic deformation of the plug and failure of the connection node between modules. Summary of the invention

[0006] In view of the above problems, the purpose of the utility model is to provide a post-tensioned modular steel frame assembly node that can be quickly disassembled and assembled. In combination with the stress characteristics of modular prefabricated buildings, the docking assembly of each module unit is achieved through an inner sleeve and an outer adapter assembly, and the upper and lower connecting components are fixed with tension bolts. The pull rod is inserted into the lower module column in advance, and prestress is applied to it after docking with the upper module column.

[0007] The structural system has good integrity and a clear load transfer path. Most components and connection components are prefabricated in the factory in advance. Only simple bolt insertion is required during on-site construction, which can achieve rapid assembly and disassembly of the structure. The assembly node is fully assembled, avoiding tedious on-site welding procedures, with low noise and environmental friendliness. Due to the presence of the tie rod, the upper and lower modules can work together better and closely cooperate, meeting the design principle of "strong nodes, weak components" and having great engineering application value.

[0008] The technical solution adopted by the utility model is as follows:

[0009] A post-tensioned modular steel frame assembly node that can be quickly disassembled and assembled includes a connection component and a prestressed pull rod for docking frame modules. The connection component includes an inner connection component and an outer adapter component. A friction energy absorption plate is integrally formed at the connection between the upper and lower sleeves. After assembly, the energy absorption plate fits tightly with the outer adapter component and docking of the module beam and column components is achieved through the outer adapter connection end.

[0010] Preferably, the friction energy dissipation plate is integrally formed with the inner sleeve during the manufacturing process, and a plurality of bolt holes are provided on the friction plate so that it is tightly attached to the outer wall of the module beam during assembly.

[0011] Preferably, the inner sleeve is installed tightly against the inner wall of the module column and is connected to the module frame node through an external adapter assembly.

[0012] Preferably, the external adapter assembly is used for docking the upper and lower column nodes of the module unit, and includes a module column joint and two module beam joints. The module beam joint is an "L" - shaped structure, and an array of through - bolts is provided at the docking port of the module beam end.

[0013] Preferably, an operation opening is provided on the surface of the module beam joint for passing through the tension bolts after the module assembly is completed. Inspection openings are provided on both sides of the joint for checking whether the module beam is installed in place.

[0014] Preferably, bolt holes are correspondingly provided on the external adapter assembly, module beam and column members, internal connection assembly and energy - dissipating friction plate, and the overall connection of each component can be realized through through - bolts.

[0015] Preferably, a prestressed tension rod is arranged inside the module column, and the tension rod penetrates through the upper and lower two module columns.

[0016] Preferably, the prestressed tension rod penetrates through the upper and lower module column profiles, inner sleeves and shear keys, and is fixed by fastening nuts.

[0017] Optionally, the modular prefabricated joint structure can assemble the connection components accordingly according to different positions such as corner columns, edge columns and middle columns, and its structural form should be appropriately adjusted.

[0018] In summary, due to the adoption of the above - mentioned technical solutions, the beneficial effects of the present utility model are as follows:

[0019] (1) The inner sleeve and the external adapter assembly cooperate with each other, which can effectively prevent the occurrence of plastic hinges at the column ends under high - strength load conditions, and avoid flexural - torsional instability or column - end shear failure. A friction energy - dissipating plate is provided at the connection of the upper and lower sleeves, which is closely attached to the upper and lower module beams. When the upper and lower module beams undergo bending deformation or relative displacement with respect to the energy - dissipating plate, energy is dissipated.

[0020] (2) Under this joint system, the load transfer path from top to bottom is clear, the adapter is firm and reliable, so that the mechanical properties are easy to be guaranteed, effectively improving the flexural and shear resistance of the components and the overall lateral - displacement resistance of the module unit. In addition, due to the existence of the prestressed tension rod, not only the structural integrity and anti - progressive collapse ability are improved, but also the upper and lower module units can work better together, avoiding flexural - torsional instability of the module columns.

[0021] (3) This structure can realize rapid building assembly. The components are pre - fabricated in the factory in advance. At the same time, each module unit is small in volume and light in weight, which is convenient for storage and transportation. During on - site construction, only the module unit and the adapter need to be assembled on the ground, and then the full assembly is realized by hoisting, avoiding complex welding processes. The cross - sectional dimensions of the members in the structure are single, the module installation is convenient, and the cumulative error transmission is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0023] Figure 1 Schematic diagram of the node structure provided for this embodiment;

[0024] Figure 2 Schematic diagram of the disassembly of the module node assembly provided for this embodiment;

[0025] Figure 3 Schematic diagram of the internal connection component and the tie rod structure provided for this embodiment;

[0026] Figure 4 Schematic diagram of the installation process of the prestressed tie rod provided for this embodiment;

[0027] Figure 5 Schematic diagram of the external adapter component structure provided for this embodiment;

[0028] Description of the drawings: 1 - upper module; 2 - lower module; 3 - internal connection component; 301 - energy dissipation friction plate; 302 - through bolt hole; 303 - inner sleeve; 4 - adapter component; 401 - beam end docking port; 402 - column end docking port; 403 - tension bolt; 404 - adapter port; 405 - inspection port; 5 - prestressed tie rod; 501 - shear resistance end plate; 502 - fastening bolt; 6 - steel beam module; 7 - module column; 701 - installation port. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0031] In the description of the present utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application.

[0032] The following will Figures 1 - 5 make a detailed description of the present invention.

[0033] Embodiment

[0034] A post-tensioned modular steel frame assembly node that can be quickly disassembled and assembled includes an upper module 1 and a lower module 2. The internal connection component 3 includes an energy-dissipating friction plate 301 and an inner sleeve 303. When connecting, the inner sleeve 303 is inserted into the module column 7 through an outer sleeve adapter 404 and fits tightly with its inner wall. A tension bolt 403 for connecting the upper and lower modules is provided on the beam end connection port 401 of the outer connection component 4. A prestressed tie rod 5 is provided inside the module column and fixed on the shear end plate 501.

[0035] As Figure 1 and 2 shown, the upper load and the self-weight of the frame keel are transmitted downward through the external connection component 4 and the internal connection component 3. The presence of the inner sleeve 303 enables the node to have sufficient support strength. Additionally, under the action of horizontal loads, energy is dissipated through the relative displacement between the friction plate 301 and the upper and lower walls of the external connection component 4, providing sufficient lateral displacement resistance margin for the assembly node.

[0036] The new modular assembly node using the inner sleeve 303, the outer connection component 4 as splicing members, and the tension bolt 403 as a fastener can effectively improve the initial rotational stiffness and load-bearing performance of the node under flexural-shear forces. At the same time, the fastening effect of the tension bolt 403 and the "lever-pry" effect in the nested area of the inner and outer sleeves 303(4) also limit the stiffness development in the node area to a certain extent, so that the node stiffness is maintained within a reasonable range, thus meeting the specification requirements for semi-rigid connections.

[0037] The inner sleeve 303 is composed of several hollow square tube cast iron parts. The column-to-column connection is achieved by connecting the prestressed tie rod 5 through a steel insert placed inside the module column 7 and fixing it at the column end. An energy-dissipating friction plate 301 is provided to increase the damping coefficient to ensure that the structure has sufficient initial rotational stiffness and energy-dissipating capacity. At the same time, the "lever-pry" effect in the nested area of the inner and outer sleeves also limits the stiffness development to a certain extent, keeping the stiffness within a reasonable range, thus meeting the semi-rigid specification requirements.

[0038] As Figure 2 shown, the modular steel beam 6 and the modular column 7 are respectively inserted into the beam-end docking interface 401 and the column-end docking interface 402, and are connected to the core 303 on the internal connection component 3 through the connection port 404 reserved on the external transfer component 4. After installation, the core 303 is closely attached to the inner wall of the modular column 7.

[0039] The upper and lower surfaces of the energy-dissipating friction plate 301 are closely attached to the upper and lower surfaces of the beam-end docking interface 402 of the outer sleeve 4. An inspection port 405 is provided on the side of the beam-end docking interface 402 for observing whether the beam end is attached to the outer surface of the external transfer component 4, that is, observing whether the components are installed in place. Then, the internal and external components 303(4) and the modular beam 6 are connected by the tension bolts 403 to further improve the integrity between modules and the bending and shear resistance of the beam end.

[0040] As Figure 3 shown, the energy-dissipating friction plate 301 on the internal connection component 3 and the core 303 are integrally formed during manufacturing. During installation, the two ends of the inner sleeve 303 are respectively inserted into the upper and lower modular columns 7, and the energy-dissipating friction plate 301 is in contact with the external transfer component 4. Through-bolt holes 302 corresponding to the upper and lower external transfer components 4 and the modular steel beam 6 are formed thereon. The internal connection component 3 can be correspondingly spliced and combined according to different node positions such as corner columns, middle columns, and side columns, and the quantity and arrangement form of the sleeves and energy-dissipating plates are adjusted and prefabricated in advance during production.

[0041] The two ends of the inner sleeve 303 are respectively inserted into the upper and lower modular columns 7, and four limiting surfaces are formed on its inner wall. The modular column 7 generates bending deformation under the action of axial compressive load, and produces extrusion with the inner sleeve 303 to form a contact force. With the cooperation of the external transfer component 4, the stress of the column section under the original load state can be effectively reduced, thereby alleviating the phenomenon of local stress concentration and providing sufficient support strength for the modular column 7. The external transfer component 4 in the form of a sleeve also has good ductility performance. This structure can significantly improve the stress state at the beam end, promote the outward movement of the plastic hinge at the beam end, and thus achieve the ductile failure of the joint.

[0042] As Figure 4 shown, the external transfer component 4 is used to dock beam and column components, and the beam connection end 402 and the column connection end 403 are respectively reserved thereon. A transfer port 404 is provided on one side of the column connection end 403 close to the base. After the upper and lower modular beam and column components are connected to the external transfer component 4, the module unit assembly is finally realized through the internal transfer component 3.

[0043] As Figure 5As shown, the prestressed tie rod 5 passes through the upper and lower module columns 7 and the inner sleeve 303, and shear keys 501 are provided at the rod ends. During installation, the tie rod 5 passes through the shear end plates 501 and is fixed by nuts 502. The installer applies prestress to and fixes the tie rod 5 through the operation openings 701 provided on both sides of the module column 7. The shear keys 501 are integrally formed with the module column 7 during fabrication.

[0044] Before module assembly, the tie rod 5 is pre-passed through the lower module column. Through the operation opening 701, a fastening nut 502 is screwed onto the rod end and fixed to the lower shear end plate 501. After all components of the upper and lower modules are assembled, the tie rod 5 penetrates the internal transfer assembly 3 and the upper module column, and finally passes through the shear end plate 501 of the upper module column. Then, through the operation opening 701 of the upper module column, a fastening nut 502 is screwed onto the rod end and prestress is applied.

[0045] The tie rod 5 is arranged vertically in the upper and lower module columns 7 and the sleeve 303 and prestress is applied, so that the upper and lower module columns 7 are simultaneously subjected to vertical pre-compression, effectively improving the integrity between the upper and lower module columns, the seismic energy dissipation capacity of the columns, and the linear stiffness along the length direction of the columns. At the same time, due to the presence of the shear end plates 501, the premature appearance of plastic hinges at the column ends is avoided, thereby preventing the loss of bearing capacity.

[0046] Most components of the modular assembly joint of the present utility model are prefabricated in advance during factory production. During on-site construction, only the module units need to be hoisted to the designed positions for installation, which not only greatly improves the construction speed but also ensures convenient disassembly during later maintenance and replacement of local components, thereby extending the life cycle of the building assembly joint. Moreover, the support structure of this application adopts full assembly, and the construction process is green and environmentally friendly. Most welding procedures are completed during factory fabrication, and most of the construction assembly work involves bolt insertion, which is simple to operate.

[0047] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, various changes and modifications can be made to this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A post-tensioned modular steel frame assembly joint that is easy to disassemble and assemble, characterized in that, It includes an upper module (1) and a lower module (2), an internal connection component (3), an energy-dissipating friction plate (301), a through-bolt hole (302), an inner sleeve (303), an external adapter component (4), a beam-end docking port (401), a column-end docking port (402), a tie bolt (403), a transfer port (404), an inspection port (405), a prestressed tie rod (5), a shear key (501), a fastening nut (502), a module beam (6), a module column (7) and an operation port (701) provided thereon. The prestressed tie rod (5) penetrates through the module column (7) and each connection component. The inner sleeve (303) is composed of several hollow square ductile iron castings. The prestressed tie rod (5) is connected and fixed at the column end by a steel insert placed inside the module column (7) to achieve the inter-column connection. An energy-dissipating friction plate (301) is provided to increase the damping coefficient to ensure that the structure has sufficient initial rotational stiffness and energy-dissipating capacity. At the same time, the "lever-pry" effect in the nested area of the inner and outer sleeves restricts the stiffness development to a certain extent, keeping the stiffness within a reasonable range, thus meeting the semi-rigid code requirements.

2. The post-tensioned modular steel frame assembly joint according to claim 1, which is easy to disassemble and assemble, is characterized in that, The energy-dissipating friction plate (301) on the internal connection component (3) is integrally formed with the inner sleeve (303) during manufacturing and can be spliced and combined according to different node positions of corner columns, middle columns and side columns to adjust the number and arrangement form of the sleeves and energy-dissipating plates.

3. The easily disassembled and assembled post-tensioned modular steel frame assembly joint according to claim 2, characterized in that, The upper and lower ends of the inner sleeve (303) are respectively inserted into the upper and lower module columns (7), and four limiting surfaces and contact forces are formed on its inner wall to provide sufficient support strength for the module column (7).

4. The easily disassembled and assembled post-tensioned modular steel frame assembly joint according to claim 2, characterized in that, The energy-dissipating friction plate (301) is provided with through-bolt holes corresponding to the module beam (6) and the external adapter component (4). After installation, the surface of the energy-dissipating friction plate (301) is closely attached to the upper and lower surfaces of the external adapter component (4) to dissipate energy when the upper and lower module beams undergo bending deformation or dislocation relative to the friction plate.

5. The easily disassembled and assembled post-tensioned modular steel frame assembly joint according to claim 1, wherein, The external adapter component (4) is divided into a beam-end docking port (401) and a column-end docking port (402), and a transfer port (404) is provided at one end close to the module column for docking with the inner sleeve (303).

6. The easily disassembled and assembled post-tensioned modular steel frame assembly joint according to claim 5, characterized in that The beam-end docking port (401) is an "L"-shaped structure, and an inspection port (405) is provided on the side for observing whether the components are installed in place during the assembly process.

7. The easily disassembled and assembled post-tensioned modular steel frame assembly joint according to claim 1, wherein, The prestressed tie rod (5) penetrates through the upper and lower module columns (7) and the inner sleeve (303), and is fixed to the shear key (501) with a fastening nut (502).

8. The easily disassembled and assembled post-tensioned modular steel frame assembly joint according to claim 7, characterized in that, The prestressed tie rod (5) is pre-installed during the assembly process of the lower module (2). After the components of the upper module (1) are assembled, docking is carried out, and finally, nut fixing and prestress application are carried out through the operation ports (701) provided on both sides of the module column (7).

9. The easily disassembled and assembled post-tensioned modular steel frame assembly joint according to claim 8, characterized in that, The module column (7) is reserved with an operation port (701) during manufacturing and is integrally formed with the shear key (501).

10. The easily disassembled and assembled post-tensioned modular steel frame assembly joint according to claim 1, characterized in that, Both the internal connection component (3) and the external adapter component (4) are multiple and can be assembled in combination, and corresponding changes can be made according to the structural forms of corner columns, middle columns and side columns.

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