A large-scale modular building system

Abstract

The application discloses a kind of large-scale module building systems of dismountable, comprising: prefabricated roof module, bottom fixedly connected with the upper column of upper support section and first splicing section;Prefabricated ground module, fixedly connected with the lower column of lower support section and second splicing section;And the prefabricated steel column middle section between the two, including intermediate support section and the third splicing section at both ends.Three column bodies are all hollow box structure, and adjacent splicing section is all realized detachable connection by bolt.The side wall of each splicing section is provided with installation hand hole for bolt fastening operation, and the side wall thickness of each splicing section is greater than the side wall thickness of its corresponding support section.The application splits large-scale building into independent transportable module, breaks through the size limit of transportation, realizes on-site rapid assembly and non-destructive disassembly turnover;Meanwhile, through the local thickening design of targeted splicing section, the cross-section weakening caused by hand hole is made up, and a good balance between safety and economy is realized.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building technology, and in particular to a large-scale modular building system that can be disassembled and assembled. Background Technology

[0002] With the development of prefabricated buildings, their technological form has evolved from single components and two-dimensional components to three-dimensional integrated modules. Although existing three-dimensional modular buildings have improved integration, their box dimensions are usually strictly limited to a width of 4.5 meters, a height of 4.15 meters, and a length of 18 meters due to road transport regulations and vehicle specifications. Even with ultra-low-bed transport vehicles, the box height is difficult to exceed the 4.5-meter upper limit.

[0003] However, in practical engineering applications, buildings such as stadiums and large warehouses often require higher and larger internal clearance dimensions. The aforementioned bottleneck in transportation dimensions means that existing standard modular steel structures cannot meet the needs of large-scale spatial buildings. Currently, for such construction projects that exceed conventional transportation size limitations, the industry has not yet developed a mature modular solution, often forcing companies to abandon the advantages of modular construction and resort to traditional on-site assembly structures. This not only reduces construction efficiency but also fails to meet the environmental and economic requirements for rapid disassembly and recyclability of temporary buildings. Summary of the Invention

[0004] The main objective of this invention is to provide a detachable, large-scale modular building system to solve the above-mentioned technical problems.

[0005] The objective of this invention can be achieved by adopting the following technical solution: A large-scale modular building system that can be disassembled and assembled includes: A prefabricated roof module, the prefabricated roof module including a roof frame and an upper column fixedly connected to the bottom of the roof frame, the upper column including an upper support section and a first splicing section located at its bottom end; Prefabricated ground modules, the prefabricated ground modules including a ground frame and lower columns extending through the ground frame, the ground frame being fixedly connected to the lower columns, the lower columns including a lower support section and a second splicing section located at its top; and The precast steel column middle section is located between the precast roof module and the precast floor module. The middle section includes a central support section and two third splicing sections located at the top and bottom of the central support section, respectively. The third splicing section at the top and the first splicing section, as well as the third splicing section at the bottom and the second splicing section, are detachably connected by bolts. The upper column, the lower column, and the middle section of the precast steel column are all hollow box-shaped structures. The first splicing segment, the second splicing segment, and each of the third splicing segments are provided with mounting hand holes on their side walls, and the bolts are tightened through the corresponding mounting hand holes; the side wall thickness of the first splicing segment is greater than the side wall thickness of the upper support segment, the side wall thickness of the second splicing segment is greater than the side wall thickness of the lower support segment, and the side wall thickness of each of the third splicing segments is greater than the side wall thickness of the middle support segment.

[0006] Beneficial technical effects of the present invention: This invention effectively resolves the fundamental contradiction between the "demand for large-scale spaces" and the "restrictions on small-size transportation" by structurally dividing large-scale building units into three independently transportable prefabricated modules: a prefabricated roof module, a prefabricated floor module, and a prefabricated steel column section. This allows modular construction methods to be applied to large-scale spatial buildings that exceed conventional transportation size limitations. Each prefabricated module is prefabricated in the factory and transported to the site, where it can be quickly assembled with bolts to form a complete building unit. This transfers a large number of construction processes from the site to the factory, significantly improving construction efficiency. Furthermore, all modules are detachably connected with bolts, allowing for non-destructive separation and reuse of each prefabricated module by removing the bolts, meeting the environmental and economic requirements for rapid disassembly and recycling of temporary buildings. Furthermore, the upper column, lower column, and the middle section of the precast steel column all adopt a hollow box-shaped structure, which has good bidirectional bending and torsional resistance, meeting the structural load-bearing requirements of large-scale spatial buildings. The hollow cavity of the box-shaped structure provides operating space for bolt connections between splicing sections. Installation handholes are opened on the side walls of each splicing section to facilitate bolt tightening operations by construction personnel. The side wall thickness of the splicing section is greater than that of the corresponding support section, which compensates for the weakening effect of the installation handholes on the cross section, ensuring the structural strength and load-bearing reliability of the splicing area. At the same time, the thickness is only locally increased in the splicing section, effectively controlling the amount of steel used and achieving a balance between structural safety and economy. Attached Figure Description

[0007] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic cross-sectional view of a modular building unit in a building system provided in an embodiment of the present invention; Figure 2 This is a side view of a modular building unit in a building system provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of a prefabricated roof module in a building system provided by an embodiment of the present invention; Figure 4 This is a schematic diagram of a prefabricated ground module in a building system provided by an embodiment of the present invention; Figure 5 This is a schematic diagram of the middle section of a precast steel column in a building system provided by an embodiment of the present invention; Figure 6 This is a schematic diagram showing the connection between the first splicing segment and the third splicing segment located at the top in a building system provided in an embodiment of the present invention; Figure 7 This is a top view of the first splicing segment in the building system provided in an embodiment of the present invention; Figure 8 This is a schematic diagram showing the connection between the second splicing segment and the third splicing segment located at the bottom in a building system provided in an embodiment of the present invention; Figure 9 A schematic diagram of the connection node between the middle section and the lower section of two adjacent precast steel columns of two modular building units in the building system provided in this embodiment of the invention; Figure 10 This is a schematic diagram of the assembly of the lower column and the building foundation in a building system provided by an embodiment of the present invention; Figure 11 This is a schematic diagram of the assembly of two adjacent lower columns of two modular building units with the building foundation in a building system provided by an embodiment of the present invention; Figure 12 This is a schematic diagram of the splicing of two modular building units in a building system provided in an embodiment of the present invention.

[0009] Explanation of reference numerals in the attached figures: In the diagram: 1-Precast roof module, 11-Roof frame, 111-Roof beam, 12-Upper column, 121-Upper support section, 122-First splicing section, 131-Upper chord, 132-Lower chord, 133-Vertical member, 2-Precast ground module, 21-Ground frame, 22-Lower column, 221-Lower support section, 222-Second splicing section, 23-Precast concrete floor slab, 3-Middle section of precast steel column, 31-Intermediate support section, 32-Third splicing section, 4-Bolt, 41-Through hole, 5-Installation handhole, 6-Connecting steel plate, 7-Nut, 8-Stiffening plate, 9-Building foundation, 91-Embedded part, 92-Foundation connecting plate, A-Connection between the first splicing section and the third splicing section at the top, B-Connection between the second splicing section and the third splicing section at the bottom. Detailed Implementation

[0010] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0011] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0012] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0013] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0014] Please also refer to Figures 1-12This invention provides a detachable, large-scale modular building system, aiming to solve the technical problems of existing modular buildings being limited by road transport dimensions, making it difficult to construct large-scale spaces, and the low efficiency and difficulty in rapid disassembly and reusability of traditional on-site construction. Through structural decomposition design, this building system breaks down large-scale buildings that exceed transportation limitations into standard sub-units that can be prefabricated in factories and transported independently, effectively resolving the fundamental contradiction between "large-scale spatial requirements" and "small-size transportation limitations." The building system includes: a prefabricated roof module 1, which includes a roof frame 11 and an upper column 12 fixedly connected to the bottom of the roof frame 11. The upper column 12 includes an upper support section 121 and a first splicing section 122 located at its bottom end; a prefabricated ground module 2, which includes a ground frame 21 and a lower column 22 penetrating the ground frame 21. The ground frame 21 is fixedly connected to the lower column 22. The lower column 22 includes a lower support section 221 and a second splicing section 222 located at its top end; and a prefabricated steel column middle section 3, which is disposed between the prefabricated roof module 1 and the prefabricated ground module 2. The prefabricated steel column middle section 3 includes a middle support section 31 and two third splicing sections located at the top and bottom ends of the middle support section 31, respectively. The third splicing segment 32 at the top and the first splicing segment 122, as well as the third splicing segment 32 at the bottom and the second splicing segment 222, are detachably connected by bolts 4. The upper column 12, the lower column 22, and the middle section 3 of the precast steel column are all hollow box-shaped structures. The first splicing segment 122, the second splicing segment 222, and each of the third splicing segments 32 have mounting hand holes 5 on their side walls, and the bolts 4 are tightened through the corresponding mounting hand holes 5. The side wall thickness of the first splicing segment 122 is greater than the side wall thickness of the upper support segment 121, the side wall thickness of the second splicing segment 222 is greater than the side wall thickness of the lower support segment 221, and the side wall thickness of each of the third splicing segments 32 is greater than the side wall thickness of the middle support segment 31.

[0015] In this embodiment, as Figure 1 As shown, the building system includes a prefabricated roof module 1, a prefabricated floor module 2, and a prefabricated steel column section 3 positioned between the prefabricated roof module 1 and the prefabricated floor module 2. These three prefabricated modules can be prefabricated separately in the factory, transported to the construction site, and assembled using bolts 4 to form a complete modular building unit. Because each prefabricated module can be transported independently, this building system overcomes the bottleneck of conventional three-dimensional modular buildings limited by transportation dimensions, realizing the modular construction of large-scale spatial buildings.

[0016] like Figures 1-3As shown, the prefabricated roof module 1 includes a roof frame 11 and upper columns 12 fixedly connected to the bottom of the roof frame 11. The roof frame 11 is composed of steel components such as roof beams 111, forming a horizontal frame structure to bear the load of the roof system. The upper columns 12 are located at each column position of the roof frame 11, with the top of the upper columns 12 fixedly connected to the roof frame 11 and extending downward from the bottom of the roof frame 11. The prefabricated roof module 1 is a single prefabricated component. The roof frame 11 and the upper columns 12 are manufactured and fixedly connected in the factory. After being transported to the site, the upper columns 12 are spliced ​​with the middle section 3 of the prefabricated steel columns below.

[0017] The upper column 12 includes an upper support section 121 and a first splicing section 122 located at the bottom of the upper support section 121. The upper support section 121 is the main load-bearing part of the upper column 12, used to transfer the vertical load from the roof frame 11 to the lower column section. The first splicing section 122 is located at the bottom of the upper column 12 and is used to achieve a detachable splicing connection with the top of the precast steel column middle section 3.

[0018] like Figure 2 and Figure 4 As shown, the prefabricated ground module 2 includes a ground frame 21 and lower columns 22 that penetrate the ground frame 21. The ground frame 21 is composed of steel components such as ground beams, forming a horizontal frame structure to bear the load of the ground system. The lower columns 22 penetrate the ground frame 21, meaning that the lower columns 22 pass vertically through the horizontal plane where the ground frame 21 is located. Part of the lower columns 22 is located above the ground frame 21, and another part is located below the ground frame 21. The ground frame 21 is fixedly connected to the lower columns 22, which provide vertical support to the ground frame 21. The lower columns 22 are set at column positions corresponding to the upper columns 12. The prefabricated ground module 2 is a whole prefabricated component. The ground frame 21 and the lower columns 22 are manufactured and fixedly connected in the factory. After being transported to the site, the lower columns 22 are spliced ​​with the middle section 3 of the upper prefabricated steel columns.

[0019] The lower column 22 includes a lower support section 221 and a second splice section 222 located at the top of the lower support section 221. The lower support section 221 is the main load-bearing part of the lower column 22, used to transfer the vertical load from the superstructure downwards. The second splice section 222 is located at the top of the lower column 22 and is used to achieve a detachable splice connection with the bottom of the precast steel column middle section 3.

[0020] like Figure 2 and Figure 5As shown, the precast steel column middle section 3 is located between the precast roof module 1 and the precast ground module 2, serving as an intermediate column segment connecting the upper column 12 and the lower column 22. The precast steel column middle section 3 includes an intermediate support section 31 and two third splicing sections 32 located at the top and bottom of the intermediate support section 31, respectively. The intermediate support section 31 is the main load-bearing part of the precast steel column middle section 3, bearing the vertical load transfer between the upper column 12 and the lower column 22. The third splicing section 32 located at the top of the intermediate support section 31 is used to connect with the first splicing section 122 of the upper column 12, and the third splicing section 32 located at the bottom of the intermediate support section 31 is used to connect with the second splicing section 222 of the lower column 22. The precast steel column middle section 3, as an independent precast component, is manufactured in the factory and transported independently to the construction site for assembly.

[0021] The upper column 12, lower column 22, and the middle section of the precast steel column 3 are all hollow box-shaped structures. Specifically, the cross-sections of the upper column 12, lower column 22, and middle section of the precast steel column 3 are all rectangular hollow shapes, enclosed by four sidewall steel plates. The box-shaped structure has good bidirectional bending and torsional resistance, and the stress is uniform in all directions of the cross-section, which can meet the structural load-bearing requirements of large-scale building spaces.

[0022] like Figure 6 and Figure 8 As shown, the third splicing segment 32 at the top and the first splicing segment 122, as well as the third splicing segment 32 at the bottom and the second splicing segment 222, are detachably connected by bolts 4. During assembly, adjacent splicing segments are aligned and then secured together with bolts 4 to form a reliable structural connection node. When disassembly of a module is required, loosening and removing bolts 4 allows for separation between the prefabricated modules, thus enabling the entire building system to be detachable and reusable. The use of bolts 4 is a mechanical connection method, allowing for rapid on-site assembly and non-destructive disassembly, which is beneficial for the recycling and reuse of modules.

[0023] like Figures 6-9 As shown, installation handholes 5 are provided on the side walls of the first splicing segment 122, the second splicing segment 222, and each of the third splicing segments 32. The installation handholes 5 are located on the side walls of each splicing segment of the box-shaped column, and their size allows construction personnel to insert their hands and fastening tools into the inner cavity of the box-shaped column for operation. When tightening the bolts 4, construction personnel insert tools into the inner cavity of the corresponding splicing segment through the installation handholes 5 to tighten the bolts 4, completing the connection between the splicing segments; during disassembly, the bolts 4 are loosened and removed through the installation handholes 5. The installation handholes 5 improve the convenience of construction and the efficiency of assembly and disassembly.

[0024] The sidewall thickness of the first splicing segment 122 is greater than that of the upper support segment 121, the sidewall thickness of the second splicing segment 222 is greater than that of the lower support segment 221, and the sidewall thickness of each of the third splicing segments 32 is greater than that of the middle support segment 31. That is, the sidewall thickness of the upper column 12, the lower column 22, and the precast steel column middle segment 3 at each splicing segment is greater than the sidewall thickness of their corresponding support segments, forming a box-shaped column structure with variable wall thickness. The purpose of using a thickened sidewall design at the splicing segments is that, since installation manholes 5 are opened on the sidewalls of each splicing segment, the opening of these manholes 5 will weaken the cross-section of the box-shaped column to a certain extent. By increasing the sidewall thickness at the splicing segments, the cross-sectional weakening effect caused by the installation manholes 5 can be compensated for, ensuring that the structural strength and load-bearing capacity of the splicing area meet the design requirements, and ensuring that the entire steel column formed by connecting the upper column 12, the precast steel column middle segment 3, and the lower column 22 has reliable overall structural performance.

[0025] This embodiment of the detachable large-scale modular building system divides the complete large-scale modular building unit into three independent prefabricated components: a prefabricated roof module 1, a prefabricated floor module 2, and a prefabricated steel column midsection 3. Each prefabricated component can be manufactured separately in the factory and independently meets the requirements of transportation size restrictions. After transportation to the construction site, the prefabricated steel column midsection 3 is placed at the corresponding column position between the prefabricated roof module 1 and the prefabricated floor module 2. The first splicing section 122 is connected to the top third splicing section 32, and the second splicing section 222 is connected to the bottom third splicing section 32, using bolts 4, which allows for rapid assembly to form a complete large-scale modular building unit. In this building system, all prefabricated modules are detachably connected using bolts 4. When the building is finished or needs to be relocated, the bolts 4 can be removed to disassemble and separate the prefabricated modules, enabling the modules to be reused and reducing the construction cost throughout the entire life cycle.

[0026] In one embodiment, a transverse connecting steel plate 6 is provided between the bottom end plate of the first splicing segment 122 and the top end plate of the third splicing segment 32 located at the top end; the bolt 4 between the first splicing segment 122 and the third splicing segment 32 is sequentially inserted through the bottom end plate of the first splicing segment 122, the connecting steel plate 6 and the top end plate of the third splicing segment 32; both ends of the bolt 4 extend into the inner cavity of the first splicing segment 122 and the inner cavity of the third splicing segment 32 respectively, and are screwed and fixed with nuts 7.

[0027] In this embodiment, as Figure 6As shown, the first splicing segment 122 is a box-shaped cavity structure with a closed bottom. A bottom plate is provided at its bottom end, which, together with the four sidewall steel plates of the first splicing segment 122, forms a box-shaped cavity. The top of this box-shaped cavity communicates with the hollow inner cavity of the upper support segment 121. Similarly, the third splicing segment 32, located at the top, is a box-shaped cavity structure with a closed top end. A top plate is provided at its top end, which, together with the four sidewall steel plates of the third splicing segment 32, forms a box-shaped cavity. The bottom of this box-shaped cavity communicates with the hollow inner cavity of the middle support segment 31.

[0028] When the prefabricated roof module 1 is spliced ​​with the prefabricated steel column middle section 3, the bottom plate of the first splicing section 122 faces downwards, and the top plate of the third splicing section 32, located at the top, faces upwards, with the two aligned vertically. A transverse connecting steel plate 6 is provided between the bottom plate of the first splicing section 122 and the top plate of the third splicing section 32. The connecting steel plate 6 is horizontally positioned and sandwiched between the bottom plate of the first splicing section 122 and the top plate of the third splicing section 32. Figure 6 As shown, the bottom plate of the first splicing segment 122, the connecting steel plate 6, and the top plate of the third splicing segment 32 all have through holes 41 at corresponding positions, and the positions of the through holes 41 on each plate are aligned with each other.

[0029] Bolts 4, which connect the first splicing segment 122 and the third splicing segment 32 located at the top, are sequentially inserted through the bottom end plate of the first splicing segment 122, the connecting steel plate 6, and the top end plate of the third splicing segment 32. Specifically, bolts 4 pass through through holes 41 on the bottom end plate, the connecting steel plate 6, and the top end plate in a vertical direction, thereby fastening the three layers of plates through and through. The two ends of bolts 4 extend into the inner cavities of the first splicing segment 122 and the third splicing segment 32, respectively. That is, the upper end of bolts 4 passes through the bottom end plate and extends upward into the box-shaped inner cavity of the first splicing segment 122, and the lower end of bolts 4 passes through the top end plate and extends downward into the box-shaped inner cavity of the third splicing segment 32. Nuts 7 are screwed into the upper and lower ends of bolt 4 respectively. The two nuts 7 are located in the inner cavity of the first splicing section 122 and the inner cavity of the third splicing section 32 respectively. By tightening the nuts 7, the three layers of plates, namely the bottom plate, the connecting steel plate 6 and the top plate, are clamped and fixed.

[0030] During assembly, workers insert fastening tools into the box-shaped cavities of the first and third splicing sections 122 and 32 respectively through the installation handholes 5 on their side walls to tighten the nuts 7 at both ends of the bolts 4, thus completing the reliable connection between the first and third splicing sections 122 and 32. During disassembly, the nuts 7 are loosened through the installation handholes 5, and the bolts 4 are removed, allowing the first and third splicing sections 122 to be separated. The connecting steel plate 6 creates a double-shear connection for the bolts 4, improving the shear capacity of the splicing node. Simultaneously, the connecting steel plate 6 serves as an intermediate transition piece, aiding in the positioning and alignment of the upper and lower splicing sections during on-site assembly, and protecting the end plates from direct wear during repeated disassembly and assembly, thereby improving the connection reliability of the splicing node and the module's service life.

[0031] In one embodiment, a transverse connecting steel plate 6 is provided between the top plate of the second splicing segment 222 and the bottom plate of the third splicing segment 32 located at the bottom; the bolt 4 between the second splicing segment 222 and the third splicing segment 32 is sequentially inserted through the top plate of the second splicing segment 222, the connecting steel plate 6 and the bottom plate of the third splicing segment 32; both ends of the bolt 4 extend into the inner cavity of the second splicing segment 222 and the inner cavity of the third splicing segment 32 respectively, and are screwed and fixed with nuts 7.

[0032] In this embodiment, as Figure 8 As shown, the second splicing segment 222 is a box-shaped cavity structure with a closed top. A top plate is provided at the top, which, together with the four sidewall steel plates of the second splicing segment 222, forms a box-shaped cavity. The bottom of this box-shaped cavity communicates with the hollow inner cavity of the lower support segment 221. Similarly, the third splicing segment 32, located at the bottom, is a box-shaped cavity structure with a closed bottom. A bottom plate is provided at the bottom, which, together with the four sidewall steel plates of the third splicing segment 32, forms a box-shaped cavity. The top of this box-shaped cavity communicates with the hollow inner cavity of the middle support segment 31.

[0033] When the precast steel column section 3 is spliced ​​with the precast ground module 2, the bottom plate of the third splicing section 32 at the bottom faces downwards, and the top plate of the second splicing section 222 faces upwards, with the two aligned vertically. A transverse connecting steel plate 6 is provided between the top plate of the second splicing section 222 and the bottom plate of the third splicing section 32 at the bottom. The connecting steel plate 6 is horizontally positioned and sandwiched between the top plate of the second splicing section 222 and the bottom plate of the third splicing section 32. Figure 8 As shown, the top plate of the second splicing segment 222, the connecting steel plate 6, and the bottom plate of the third splicing segment 32 all have through holes 41 at corresponding positions, and the positions of the through holes 41 on each plate are aligned with each other.

[0034] Bolts 4, which connect the second splicing segment 222 and the third splicing segment 32 located at the bottom, are sequentially inserted through the top plate of the second splicing segment 222, the connecting steel plate 6, and the bottom plate of the third splicing segment 32. Specifically, bolts 4 pass vertically through through holes 41 on the top plate, the connecting steel plate 6, and the bottom plate, respectively, to secure the three layers of plates. Both ends of bolts 4 extend into the inner cavities of the second splicing segment 222 and the third splicing segment 32, respectively. That is, the lower end of bolts 4 passes through the top plate and extends downward into the box-shaped inner cavity of the second splicing segment 222, while the upper end of bolts 4 passes through the bottom plate and extends upward into the box-shaped inner cavity of the third splicing segment 32. Nuts 7 are screwed into the upper and lower ends of bolt 4 respectively. The two nuts 7 are located in the inner cavity of the third splicing section 32 and the inner cavity of the second splicing section 222 respectively. By tightening the nuts 7, the three layers of plates, namely the top plate, the connecting steel plate 6 and the bottom plate, are clamped and fixed.

[0035] During assembly, workers insert fastening tools into the respective box-shaped cavities through the installation handholes 5 on the side walls of the second and third splicing sections 222 and 32, respectively, to tighten the nuts 7 at both ends of the bolts 4, thus completing the reliable connection between the second and third splicing sections 222 and 32. During disassembly, the nuts 7 are loosened through the installation handholes 5, and the bolts 4 are removed, allowing the second and third splicing sections 222 to be separated. The connecting steel plate 6 creates a double-shear connection for the bolts 4, improving the shear capacity of the splicing node. Simultaneously, the connecting steel plate 6 serves as an intermediate transition piece, aiding in the positioning and alignment of the upper and lower splicing sections during on-site assembly, and protecting the end plates from direct wear during repeated disassembly and assembly, thereby improving the connection reliability of the splicing node and the module's service life.

[0036] In one embodiment, stiffening plates 8 are provided on the inner walls of the first splicing segment 122, the second splicing segment 222 and each of the third splicing segments 32, and the mounting hand hole 5 is located between the stiffening plate 8 and the corresponding bottom end plate or top end plate.

[0037] In this embodiment, as Figure 6 and Figure 8 As shown, stiffening plates 8 are provided on the inner walls of the first splicing segment 122, the second splicing segment 222, and each of the third splicing segments 32. The stiffening plates 8 are fixedly connected to the inner surface of the box-shaped side wall of each splicing segment, extending in the horizontal direction, and constraining and strengthening the box-shaped cross-section.

[0038] The mounting handhole 5 is located between the stiffening plate 8 and the corresponding bottom or top plate. Specifically: In the first splicing section 122, the stiffening plate 8 is set on the inner wall of the box-shaped inner cavity of the first splicing section 122, and the installation hand hole 5 is opened on the side wall area between the stiffening plate 8 and the bottom plate of the first splicing section 122, that is, the installation hand hole 5 is located below the stiffening plate 8, in the side wall position corresponding to the space between the stiffening plate 8 and the bottom plate.

[0039] In the second splicing section 222, the stiffening plate 8 is set on the inner wall of the box-shaped inner cavity of the second splicing section 222, and the installation hand hole 5 is opened on the side wall area between the stiffening plate 8 and the top plate of the second splicing section 222. That is, the installation hand hole 5 is located above the stiffening plate 8, at the side wall position corresponding to the space between the stiffening plate 8 and the top plate.

[0040] In each third splicing segment 32, a stiffening plate 8 is disposed on the inner wall of the box-shaped inner cavity of the third splicing segment 32, and a hand hole 5 is opened in the side wall area between the stiffening plate 8 and the corresponding top or bottom plate. For the third splicing segment 32 located at the top of the precast steel column middle section 3, the hand hole 5 is located in the side wall area between the stiffening plate 8 and the top plate; for the third splicing segment 32 located at the bottom of the precast steel column middle section 3, the hand hole 5 is located in the side wall area between the stiffening plate 8 and the bottom plate.

[0041] With the above configuration, the stiffening plate 8 divides the box-shaped inner cavity of each splicing section into two areas in the vertical direction: the area near the end plate (i.e., the space between the stiffening plate 8 and the corresponding end plate) serves as the installation space for the bolts 4. The installation handholes 5 are located on the side wall corresponding to this area. Construction workers can use the installation handholes 5 to insert tools into this area to tighten or loosen the bolts 4 that pass through the end plate and the nuts 7 screwed onto the ends of the bolts 4; the area away from the end plate maintains the complete box-shaped cross-section and is not affected by the opening of the installation handholes 5.

[0042] The stiffening plate 8, as a stiffening component inside the box-shaped column splicing section, enhances the local stability and load-bearing capacity of the box-shaped section at the splicing section. Together with the thickened sidewall of the splicing section, it compensates for the section weakening effect caused by the opening of the installation handhole 5, and further ensures the structural safety of the splicing area.

[0043] In one embodiment, the prefabricated roof module 1 further includes a roof truss fixedly installed on the top of the roof frame 11. The roof truss includes an upper chord 131, a lower chord 132, and a vertical bar 133 connecting the upper chord 131 and the lower chord 132. The lower chord 132 is fixedly connected to the roof beam 111 of the roof frame 11.

[0044] In this embodiment, as Figure 2 and Figure 3As shown, the prefabricated roof module 1 also includes a roof truss fixedly installed on top of the roof frame 11. The roof frame 11 includes roof beams 111 extending along the width of the module, and the roof beams 111 constitute the main load-bearing components of the roof frame 11. The roof truss is located above the roof beams 111 and together with the roof frame 11, constitutes the roof structure system of the prefabricated roof module 1.

[0045] The roof truss includes an upper chord 131, a lower chord 132, and vertical members 133 connecting the upper chord 131 and the lower chord 132. The upper chord 131 extends obliquely along the roof slope, forming the roof's profile and supporting the roof panels and additional roof loads. The lower chord 132 extends horizontally and is located at the bottom of the roof truss. The vertical members 133 are vertically positioned between the upper chord 131 and the lower chord 132, connecting them into a single truss structure and transmitting shear and axial forces between them. The vertical members 133 are spaced apart along the span of the truss; their specific number and spacing are determined based on the truss's span and load requirements.

[0046] The lower chord 132 is fixedly connected to the roof beam 111 of the roof frame 11. Specifically, the lower chord 132 is supported on the top of the roof beam 111 and fixedly connected to the roof beam 111, so that the roof truss and the roof frame 11 form an integral load-bearing structure. The roof load borne by the roof truss is transferred to the vertical member 133 through the upper chord 131, then to the roof beam 111 through the lower chord 132, and finally to the upper column 12 by the roof beam 111.

[0047] like Figure 1 and Figure 2 As shown, the roof truss is arranged along the length of the module and is positioned within the span between the corresponding columns of the roof frame 11. The roof truss, roof frame 11, and upper column 12 are prefabricated and fixedly connected in the factory to form the overall component of the prefabricated roof module 1. During transport, the roof truss is located above the roof frame 11, and the overall height of the module is limited by the height of the roof truss. However, since the height of the roof truss is relatively controllable, the prefabricated roof module 1 can meet the requirements of transport size restrictions. After the prefabricated roof module 1 is assembled with the prefabricated steel column middle section 3 and the prefabricated ground module 2 on the construction site, the roof truss forms a complete pitched roof structure at the top of the building, meeting the roof height and drainage slope requirements of large-scale architectural spaces.

[0048] In one embodiment, the connection between the first splicing segment 122 and the third splicing segment 32 located at the top is located at least 0.3m below the bottom surface of the roof beam 111 of the roof frame 11; the connection between the second splicing segment 222 and the third splicing segment 32 located at the bottom is located at least 1.5m above the bottom surface of the lower column 22.

[0049] In this embodiment, as Figure 2 As shown, in this building system, the splicing connection between the upper column 12 and the middle section of the precast steel column 3, and the splicing connection between the lower column 22 and the middle section of the precast steel column 3, must meet specific requirements in the vertical setting position of their respective connections.

[0050] The connection point A between the first splice segment 122 and the third splice segment 32 at the top is located at least 0.3m below the bottom surface of the roof beam 111 of the roof frame 11. That is, the splice joint formed by connecting the first splice segment 122 of the upper column 12 with the third splice segment 32 at the top of the precast steel column middle section 3 has a vertical position at least 0.3m below the bottom surface of the roof beam 111. Figure 2 and Figure 3 As shown, the upper column 12 extends downward from the bottom of the roof frame 11. The first splice section 122 is located at the lower end of the upper column 12, and the connection between it and the third splice section 32 maintains a vertical distance of not less than 0.3m between them and the bottom surface of the roof beam 111.

[0051] The purpose of setting the top splicing position is as follows: First, to ensure that the upper splicing node avoids the core area of ​​the beam-column node where the roof beam 111 and the upper column 12 intersect. This core area bears complex combined stresses when the building is under load. Setting the detachable splicing node outside the core area can avoid affecting the overall structure of the core area. Second, to leave a vertical space of not less than 0.3m below the bottom surface of the roof beam 111, providing sufficient space for the opening of the installation handhole 5 and the tightening of the bolts 4, and avoiding interference between the installation handhole 5 and the flange or other components of the roof beam 111.

[0052] like Figure 2 and Figure 4 As shown, the connection point B between the second splicing segment 222 and the third splicing segment 32 located at the bottom is located at least 1.5m above the bottom surface of the lower column 22. That is, the splicing node formed by the connection between the second splicing segment 222 of the lower column 22 and the third splicing segment 32 at the bottom of the precast steel column middle section 3 has a vertical position at least 1.5m above the bottom surface of the lower column 22.

[0053] The purpose of setting the bottom splicing position is as follows: First, it ensures that the lower splicing node avoids the core area of ​​the column foot node at the bottom of the lower column 22, thus guaranteeing the structural integrity and load-bearing reliability of the column foot area; Second, the setting height of not less than 1.5m ensures that the splicing node is within the height range that construction personnel can easily operate while standing on the ground. Construction personnel can tighten and loosen the bolts 4 through the installation handhole 5 without the need for climbing equipment, which significantly improves the convenience and safety of on-site assembly and disassembly operations.

[0054] By rationally setting the positions of the upper and lower splicing nodes, this embodiment achieves a good balance between structural safety and construction operability: setting the upper splicing node to be no less than 0.3m from the bottom surface of the roof beam 111 ensures sufficient installation and operation space while avoiding the core area of ​​the beam and column; setting the lower splicing node to be no less than 1.5m from the bottom surface of the lower column 22 ensures that construction personnel can work at a suitable height while avoiding the core area of ​​the column base, providing favorable construction conditions for the rapid disassembly and assembly and efficient turnover of the building system.

[0055] In one embodiment, the precast ground module 2 further includes a precast concrete floor slab 23 laid on the ground frame 21.

[0056] In this embodiment, as Figure 1 and Figure 4 As shown, the precast floor module 2 also includes a precast concrete floor slab 23 laid on the floor frame 21. The precast concrete floor slab 23 is a concrete flat plate component that is precast in a factory and cured to reach the design strength, and is used to form the floor structure of the building.

[0057] like Figure 4 As shown, the precast concrete floor slab 23 is laid above the ground beam of the ground frame 21, and the ground beam provides vertical support for the precast concrete floor slab 23. The precast concrete floor slab 23 directly bears the floor live load and additional dead load during the building's service phase, and transfers the load to the ground beams of the ground frame 21 below, and then from the ground beams to the lower column 22.

[0058] The precast concrete floor slab 23, together with the ground frame 21 and the lower column 22, is assembled in the factory to form the overall component of the precast ground module 2, which is transported and installed on site as a complete precast unit. After the precast ground module 2 is transported to the construction site, it can be installed by splicing it with the middle section 3 of the precast steel column through the second splicing section 222 at the top of the lower column 22, without the need to lay a floor slab on site.

[0059] The precast concrete floor slab 23 is directly assembled and transported with the ground frame 21 after being prefabricated in the factory, which can effectively reduce the amount of wet work on site and reduce noise and dust pollution on the construction site; it eliminates the need for on-site formwork, steel bar binding, concrete pouring and curing, and other processes, which significantly shortens the on-site construction period. At the same time, when the modules are disassembled and reused, the precast concrete floor slab 23 can be disassembled and reinstalled as a whole with the precast ground module 2, which meets the requirements of the building system to be disassembled and reused.

[0060] In one embodiment, the upper support section 121 of the upper column 12 and the first splicing section 122, the lower support section 221 of the lower column 22 and the second splicing section 222, and the middle support section 31 of the precast steel column middle section 3 and each of the third splicing sections 32 are respectively welded from box-shaped pipe sections of different wall thicknesses to form an integral variable wall thickness structure.

[0061] In this embodiment, as Figure 6 and Figure 8 As shown, the upper column 12 is welded in the factory from two box-shaped pipe sections with different wall thicknesses. The upper support section 121 uses a thinner-walled box-shaped pipe section, while the first splicing section 122 uses a thicker-walled box-shaped pipe section. Both box-shaped pipe sections have the same external cross-sectional dimensions but different sidewall thicknesses. During factory processing, the ends of the thin-walled box-shaped pipe section corresponding to the upper support section 121 are aligned with the ends of the thick-walled box-shaped pipe section corresponding to the first splicing section 122, and then welded together using butt welds to form an integral variable-wall-thickness structure for the upper column 12. After welding, the upper support section 121 and the first splicing section 122 become a continuous integral column component, and the weld between them ensures reliable force transmission; its structural performance is equivalent to that of a single integral column.

[0062] Similarly, the lower column 22 is welded in the factory from two box-shaped pipe sections with different wall thicknesses. The lower support section 221 uses a box-shaped pipe section with a thinner wall thickness, while the second splicing section 222 uses a box-shaped pipe section with a thicker wall thickness. The ends of the two pipe sections are aligned and welded together to form an integral variable wall thickness structure for the lower column 22.

[0063] The precast steel column middle section 3 is welded from three box-type pipe sections in the factory. The middle support section 31 uses a box-type pipe section with a thinner wall thickness, while the third splicing section 32 located at the top and bottom of the middle support section 31 uses box-type pipe sections with thicker walls. The top of the middle support section 31 is welded to the bottom of the top third splicing section 32, and the bottom of the middle support section 31 is welded to the top of the bottom third splicing section 32. The three pipe sections are welded together to form an integral variable wall thickness structure of the precast steel column middle section 3.

[0064] A monolithic variable-wall-thickness structure is formed by welding box-type pipe sections of varying wall thicknesses. Standardized box-type pipes of different wall thicknesses can be cut and processed in the factory. By selecting pipe sections of different wall thicknesses to meet the functional requirements of the support and splicing sections, a monolithic column component is formed after welding. In the factory welding environment, the welding quality is stable, reliable, and controllable. The monolithic structure ensures continuous force transmission between the support and splicing sections, resulting in good overall column integrity. The use of thicker-walled pipe sections in the splicing sections meets the cross-sectional reinforcement requirements after the installation manhole 5 is opened, while the use of thinner-walled pipe sections in the support sections effectively controls steel consumption and component weight, achieving a balance between structural safety and economy.

[0065] In one embodiment, the building foundation 9 is further included, wherein an embedded part 91 is provided in the building foundation 9, and a foundation connecting plate 92 is fixedly connected to the top of the embedded part 91; the bottom plate of the lower column 22 is detachably connected to the foundation connecting plate 92 by bolts 4; the building foundation 9 is a strip foundation or an independent foundation.

[0066] In this embodiment, as Figure 1 , Figure 2 and Figure 11 As shown, this building system also includes building foundation 9. Building foundation 9 is a concrete foundation structure poured on-site using conventional foundation construction methods. It is used to bear all the loads transmitted from the superstructure modular building structure and transfer them to the ground. Building foundation 9 is constructed in advance before the prefabricated modules arrive on site, providing a supporting foundation for the on-site assembly of the superstructure prefabricated modules.

[0067] The building foundation 9 is equipped with embedded parts 91. These embedded parts 91 are pre-embedded in the foundation concrete during the concrete pouring process. The lower anchoring section of the embedded part 91 is embedded within the foundation concrete, forming a reliable anchorage. A foundation connecting plate 92 is fixedly connected to the top of the embedded part 91. The foundation connecting plate 92 is a horizontally positioned steel plate, fixedly connected to the top of the embedded part 91, with its top surface protruding from the top surface of the building foundation 9 and remaining horizontal. Bolts 4 are fixedly installed on the foundation connecting plate 92, extending vertically upwards. The number and arrangement of the bolts 4 correspond to the pre-set through holes 41 on the bottom end plate of the lower column 22. After the concrete pouring and curing of the building foundation 9 are completed, the embedded parts 91, foundation connecting plates 92, and bolts 4 at each lower column 22 position are in place and ready for connection.

[0068] The building foundation 9 can be a strip foundation or an isolated foundation. When a strip foundation is used, it extends continuously along the length of the modular building unit, and each lower column 22 has its own corresponding embedded part 91, foundation connecting plate 92, and bolt 4 at its column position. When an isolated foundation is used, an independent foundation block is set below each lower column 22, and each isolated foundation has its own embedded part 91, foundation connecting plate 92, and bolt 4. The specific choice of foundation type can be determined comprehensively based on factors such as the actual geological conditions of the project, the load of the superstructure, and the usage requirements.

[0069] The bottom end of the lower column 22 is provided with a bottom plate, and the bottom plate has through holes 41 corresponding to the bolts 4 (not shown separately in the attached diagram). After the prefabricated ground module 2 is transported to the construction site, it is hoisted and positioned above the completed building foundation 9, aligning each lower column 22 with the foundation connecting plate 92 at its corresponding column position. The bottom plate of the lower column 22 is lowered onto the foundation connecting plate 92, and the bolts 4 extending upwards from the foundation connecting plate 92 pass through the through holes 41 on the bottom plate of the lower column 22, with the upper end of the bolts 4 extending into the inner cavity of the lower column 22. Then, nuts 7 are screwed into and tightened at the upper end of the bolts 4 extending into the inner cavity, clamping and fixing the bottom plate of the lower column 22 to the foundation connecting plate 92, thereby achieving a detachable connection between the prefabricated ground module 2 and the building foundation 9. After the prefabricated ground module 2 is fixed on the building foundation 9, the prefabricated steel column middle section 3 and the prefabricated roof module 1 are assembled in sequence to form a complete modular building unit. All loads of the upper modular building structure are transferred to the embedded parts 91 via the lower column 22, bolt 4 connection nodes and foundation connection plate 92, and finally transferred to the foundation by the building foundation 9.

[0070] Since the prefabricated ground module 2 is detachably connected to the building foundation 9 using bolts 4, when the building is completed and needs to be dismantled or relocated, the bolts 4 connecting the upper prefabricated roof module 1 and the middle section 3 of the prefabricated steel column are removed sequentially. Then, the nuts 7 at the upper end of the bolts 4 are loosened from the inner cavity of the lower column 22, and the prefabricated ground module 2 can be lifted off the building foundation 9 as a whole. After all the prefabricated modules are dismantled, they can be transported to a new site for reassembly and reuse, realizing the reuse of the modules. The building foundation 9, as a concrete structure constructed on-site, can be retained for the next module installation or dismantled in a conventional manner as needed.

[0071] Furthermore, such as Figure 10As shown, a hand hole is provided on the side wall of the lower column 22 near the foundation connection plate 92. The hand hole is located on the side wall of the bottom end of the lower column 22, close to the bottom end plate of the lower column 22, so that construction workers can insert fastening tools into the bottom area of ​​the inner cavity of the lower column 22 through the hand hole to tighten or loosen the nut 7 at the upper end of the bolt 4 that passes through the bottom end plate and extends into the inner cavity, thereby completing the connection or disassembly between the prefabricated ground module 2 and the building foundation 9.

[0072] The sidewall thickness of the area where the installation manhole is located is also greater than the sidewall thickness of the lower support section 221. That is, the area near the bottom plate of the lower column 22 features a thickened sidewall design. By increasing the sidewall thickness of the area where the installation manhole is located, the weakening effect of the installation manhole on the box-shaped cross-section at the bottom of the lower column 22 is compensated, ensuring that the structural strength and load-bearing capacity of the connection area between the bottom of the lower column 22 and the building foundation 9 meet the design requirements. Thus, the lower column 22 forms a structure with thickened sidewalls at both ends and thinner sidewalls in the middle.

[0073] In one embodiment, the building system includes multiple modular building units arranged side by side along the width direction, each of the modular building units including the prefabricated roof module 1, the prefabricated ground module 2, and the prefabricated steel column middle section 3.

[0074] In this embodiment, as Figure 11 and Figure 12 As shown, this building system includes multiple modular building units arranged side by side along the width direction. Each modular building unit includes a prefabricated roof module 1, a prefabricated floor module 2, and a prefabricated steel column section 3. That is, each modular building unit is a complete modular building unit assembled from the three prefabricated modules, namely the prefabricated roof module 1, the prefabricated floor module 2, and the prefabricated steel column section 3, as described in the aforementioned embodiment.

[0075] Multiple modular building units are arranged side-by-side along the width of the building, with their longitudinal axes parallel to each other, and adjacent modular building units are placed close together in the width direction. For example... Figure 12 As shown, each modular building unit has its own independent prefabricated roof module 1, prefabricated floor module 2, and prefabricated steel column middle section 3. Each modular building unit is connected by its own bolts 4 to complete the assembly of its three internal prefabricated modules. Figure 12 As shown, adjacent modular building units have their respective lower column 22 (or upper column 12) set close together at the boundary in the width direction.

[0076] By arranging multiple modular building units side-by-side along the width direction, the total span of the building system in the width direction expands as the number of modular building units increases. For example, when the width of a single modular building unit is 3m to 4.5m, two modular building units arranged side-by-side can form a building width of 6m to 9m, three modular building units arranged side-by-side can form a building width of 9m to 13.5m, and so on. The number of modular building units can be flexibly configured according to the spatial requirements of the actual building function. In the length direction of the building, all modular building units share the same length dimension, forming a regular rectangular building plan.

[0077] Each modular building unit is prefabricated in the factory and then transported independently to the construction site. During on-site construction, the modular building units are arranged sequentially along the width direction, and the prefabricated roof module 1, prefabricated floor module 2, and prefabricated steel column midsection 3 within each modular building unit are assembled with bolts 4. Because each modular building unit maintains independent detachable characteristics, during the building's use, when it is necessary to expand the building scale, new modular building units can be added to the side of the existing building in the width direction; when it is necessary to reduce the building scale, the modular building units at the edge of the width direction can be removed, realizing flexible expansion and reduction of the building space scale to adapt to changes in functional requirements at different stages of use.

[0078] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A detachable, large-scale modular building system, characterized in that, include: A prefabricated roof module, the prefabricated roof module including a roof frame and an upper column fixedly connected to the bottom of the roof frame, the upper column including an upper support section and a first splicing section located at its bottom end; Prefabricated ground modules, the prefabricated ground modules including a ground frame and lower columns extending through the ground frame, the ground frame being fixedly connected to the lower columns, the lower columns including a lower support section and a second splicing section located at its top; and The precast steel column middle section is located between the precast roof module and the precast floor module. The middle section includes a central support section and two third splicing sections located at the top and bottom of the central support section, respectively. The third splicing section at the top and the first splicing section, as well as the third splicing section at the bottom and the second splicing section, are detachably connected by bolts. The upper column, the lower column, and the middle section of the precast steel column are all hollow box-shaped structures. The first splicing segment, the second splicing segment, and each of the third splicing segments are provided with mounting hand holes on their side walls, and the bolts are tightened through the corresponding mounting hand holes; the side wall thickness of the first splicing segment is greater than the side wall thickness of the upper support segment, the side wall thickness of the second splicing segment is greater than the side wall thickness of the lower support segment, and the side wall thickness of each of the third splicing segments is greater than the side wall thickness of the middle support segment.

2. The detachable large-scale modular building system according to claim 1, characterized in that, A transverse connecting steel plate is provided between the bottom plate of the first splicing segment and the top plate of the third splicing segment located at the top; the bolts between the first splicing segment and the third splicing segment are sequentially inserted through the bottom plate of the first splicing segment, the connecting steel plate, and the top plate of the third splicing segment; the two ends of the bolts extend into the inner cavity of the first splicing segment and the inner cavity of the third splicing segment, respectively, and are screwed and fixed with nuts.

3. The detachable large-scale modular building system according to claim 2, characterized in that, A transverse connecting steel plate is provided between the top plate of the second splicing segment and the bottom plate of the third splicing segment located at the bottom; the bolts between the second splicing segment and the third splicing segment are sequentially inserted through the top plate of the second splicing segment, the connecting steel plate, and the bottom plate of the third splicing segment; both ends of the bolts extend into the inner cavity of the second splicing segment and the inner cavity of the third splicing segment, respectively, and are screwed and fixed with nuts.

4. The detachable large-scale modular building system according to claim 3, characterized in that, The inner walls of the first splicing segment, the second splicing segment, and each of the third splicing segments are provided with stiffening plates, and the mounting hand holes are located between the stiffening plates and the corresponding bottom end plates or top end plates.

5. The detachable large-scale modular building system according to claim 1, characterized in that, The prefabricated roof module also includes a roof truss fixedly installed on the top of the roof frame. The roof truss includes an upper chord, a lower chord, and a vertical member connecting the upper chord and the lower chord. The lower chord is fixedly connected to the roof beam of the roof frame.

6. The detachable large-scale modular building system according to claim 1, characterized in that, The connection between the first splicing segment and the third splicing segment located at the top is located at least 0.3m below the bottom surface of the roof beam of the roof frame; the connection between the second splicing segment and the third splicing segment located at the bottom is located at least 1.5m above the bottom surface of the lower column.

7. The detachable large-scale modular building system according to claim 1, characterized in that, The prefabricated ground module also includes a prefabricated concrete floor slab laid on the ground frame.

8. The detachable large-scale modular building system according to claim 1, characterized in that, The upper support section and the first splicing section in the upper column, the lower support section and the second splicing section in the lower column, and the middle support section and each of the third splicing sections in the middle section of the precast steel column are respectively welded from box-shaped pipe sections of different wall thicknesses to form an integrated variable wall thickness structure.

9. The detachable large-scale modular building system according to claim 1, characterized in that, It also includes a building foundation, in which embedded parts are provided, and a foundation connecting plate is fixedly connected to the top of the embedded parts; the bottom plate of the lower column is detachably connected to the foundation connecting plate by bolts; the building foundation is a strip foundation or an independent foundation.

10. The detachable large-scale modular building system according to claim 1, characterized in that, The building system includes multiple modular building units arranged side by side along the width direction. Each modular building unit includes the prefabricated roof module, the prefabricated floor module, and the prefabricated steel column middle section.

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