Multi-layer Z-shaped folding modular integrated building and construction method thereof

Abstract

The invention discloses a multi-layer Z-shaped folding modular integrated building and a construction method thereof, and belongs to the technical field of modular buildings, the multi-layer Z-shaped folding modular integrated building comprises a first stand column, a second stand column, an integrated floor system, an integrated wall body, a sliding bracket, a hanging device and a lengthened corner fitting; the short edge beam of the integrated floor system is provided with a pressing groove and an opening curled edge, the sliding support is placed in the pressing groove, and the hanging device is embedded into the inner side of the curled edge. The lengthened corner fittings are differentially constructed at the top and bottom ends and in the middle floor system area, and the lengthened corner fittings at the two ends of the same short-direction edge beam face opposite directions, so that the first stand column rotates around the top of the column, the second stand column rotates around the bottom of the column, and the first stand column and the second stand column synchronously rotate in the same direction to form a Z-shaped folding mode; the multi-layer floor system is alternately connected with the first stand columns and the second stand columns to form a body. The lengthened corner piece meets the clearance requirement between all components during folding through end extension and the design of an L-shaped opening baffle. Folding-state transportation of the multi-story building and overall rapid unfolding construction on a construction site are achieved.

Description

Technical Field

[0001] This invention relates to the field of modular construction, and in particular to a multi-layer folding modular steel structure building and its construction method. Background Technology

[0002] Modular buildings, due to their core advantages such as high degree of industrial prefabrication, short construction cycle, no wet work on site, and green environmental protection, have been widely used in temporary barracks, emergency disaster relief buildings, cultural tourism and resort buildings, and affordable housing. Foldable modular buildings, as an upgraded category of modular buildings, significantly reduce the building volume during transportation through their foldable structural design. This solves the industry pain points of traditional modular buildings, such as a large number of transport units, high logistics costs, and low transfer efficiency, and has become a current research hotspot in the industry.

[0003] However, existing folding modular building technologies still have many technical shortcomings, mainly including: 1. Lack of multi-layer overall folding capability: Most existing folding modular buildings are single-layer folding units. Multi-layer buildings require on-site hoisting, splicing, and fixing layer by layer, making it impossible to achieve overall factory prefabrication, overall folding transportation, and overall synchronous unfolding of multi-layer buildings. 2. Insufficient structural performance and limited application scope: The corner nodes of existing folding structures are mostly simple hinge designs, only meeting the folding and rotation requirements. After unfolding, the node stiffness is insufficient, resulting in poor overall structural stability, lateral force resistance, and seismic performance. This cannot meet the usage requirements of high-seismic-intensity areas in Southwest my country, the Middle East, and Southeast Asia, limiting the applicable scenarios. 3. Complex construction procedures and high safety risks: The unfolding construction of existing folding structures requires high-altitude operations to complete node fixing, wall installation, and other procedures, posing high safety risks. The construction procedures are complex, and folding and unfolding are time-consuming, failing to meet the core requirements of "rapid assembly and immediate occupancy" in emergency rescue scenarios. In addition, the structures in existing modular buildings are mostly fixed by welding, making disassembly difficult, resulting in low efficiency during overall transportation and poor reusability.

[0004] To address the numerous shortcomings of existing technologies, this invention proposes a multi-layered Z-shaped folding modular integrated building and its construction method. It innovates from three core dimensions: folding mode, node structure, and construction method, thoroughly solving the pain points of existing technologies and promoting the technological upgrading and large-scale application of folding modular buildings. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a multi-layer Z-shaped folding modular integrated building and its construction method, in order to solve the problems of low construction efficiency and high overall cost caused by the current modular building's single-layer transportation and hoisting.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a multi-layer Z-shaped folding modular integrated building, including a first column, a second column, an integrated floor slab, an integrated wall, a sliding support, a hanging device, and an extended corner piece; Each integrated floor slab is equipped with an extended corner piece at its corner, and the first and second columns of each floor are connected to the corresponding extended corner pieces. The extended corner piece is a square tube structure, with one end extending a certain distance above the integrated floor slab and a hinge on the edge of the end face facing the inside of the building, and an L-shaped opening baffle on the other end. The integrated floor slab has a short-side beam with a groove on the top surface and an open rolled edge on the bottom section. The sliding support rests in the groove on the top surface of the short-side beam and can slide or roll horizontally along the groove. The hanging device is embedded in the opening below the short-side beam and suspended inside the rolled edge of the short-side beam, and can slide or roll horizontally along the rolled edge. The extended corner pieces at both ends of the same short-side beam face opposite directions and are respectively connected to the first column and the second column. Both ends of the first and second columns are provided with connecting ring plates; the first column rotates around the top of the column, and its top connecting ring plate is hinged to the end face of the extended corner piece, and its bottom connecting ring plate is hinged to the sliding support; the second column rotates around the bottom of the column, and its bottom connecting ring plate is hinged to the end face of the extended corner piece, and its top is hinged to the hanging device. During the folding and unfolding process, the first and second columns on the same floor rotate in the same direction and rotate synchronously to form a Z-shaped folding pattern; multiple integrated floor slabs are alternately connected to the first and second columns on each floor to form a multi-layer foldable building body; the integrated wall is fixedly connected to the first or second column on the same floor and rotates synchronously with the first or second column and folds as a whole.

[0007] Furthermore, both the first and second columns have L-shaped open sections with the same cross-sectional dimensions; their branch plates are provided with pressure ribs, and the protrusion height of the pressure ribs does not exceed the ring width of the connecting ring plate at the ends of the first and second columns.

[0008] Furthermore, the integrated floor slab is divided into end integrated floor slabs and middle integrated floor slabs according to its position in the building. The difference between the two lies in the different structures of the extended corner pieces. The integrated floor slab is rectangular in shape and consists of long side beams, short side beams, extended corner pieces, and a floor slab system. The long side beams and short side beams are welded to the side walls of the corresponding extended corner pieces. The extended corner pieces connected to both ends of the same long side beam face the same direction, while the extended corner pieces connected to both ends of the same short side beam face opposite directions.

[0009] Furthermore, the extended corner pieces are classified according to their structural form into a first extended corner piece at the end, a second extended corner piece at the end, a first extended corner piece in the middle, and a second extended corner piece in the middle.

[0010] Furthermore, the first extended corner piece at the end is a square tube structure throughout, with connecting ring plates on both the top and bottom ends; when the cross-sectional width of the first column and the second column is B, and the thickness of the integrated end floor is D1, the height of the square tube body is B+D1+(10~50)mm; the two ends of the first extended corner piece at the end are marked as end face a1 and end face b1, respectively, wherein end face a1 is flush with the surface of the integrated end floor, and a stiffening ring plate is provided inside the square tube at a distance D1 from end face a1; end face b1 extends out of the integrated end floor by B+(10~50)mm, and a hinge is provided on the edge of end face b1 facing the inside of the building; The second extended corner piece at the end is a square tube with an L-shaped opening baffle structure, and the extended end is an L-shaped opening baffle; the height of its square tube body is D1, and the two end faces are marked as a2 end face and b2 end face respectively, and both are provided with connecting ring plates; the a2 end face and the b2 end face are flush with the upper and lower surfaces of the integrated end floor slab respectively, and the b2 end face is connected to an L-shaped opening baffle as the extended end, and the height of the L-shaped opening baffle is B+(10~50)mm; The total height of the first and second extended corner pieces at the ends is the same, and their protruding ends face the same direction.

[0011] Furthermore, both the first and second extended corner pieces in the middle adopt a structure in which a square tube body is connected to an L-shaped opening baffle at one end. The height of the square tube body is B+D1+(10~50)mm, and both ends of the square tube are provided with connecting ring plates. The height of the L-shaped opening baffle is B+(10~50)mm. The total height of the first and second extended corner pieces in the middle is the same, and the extended ends of their L-shaped opening baffles face opposite directions. The top end of the square tube of the first extended corner piece in the middle is a3 end, and the bottom end is b3 end. The a3 end is flush with the top surface of the integrated floor slab in the middle and is connected to an L-shaped opening baffle. A stiffening ring plate is provided inside the square tube at a distance D1 from the a3 end. The b3 end extends out of the bottom surface of the integrated floor slab in the middle by B+(10~50)mm, and a hinge is provided on the edge of the b3 end facing the inside of the house. The top end of the square tube of the second extended corner piece in the middle is a4 end, and the bottom end is b4 end. The b4 end is flush with the bottom surface of the integrated floor slab in the middle and is connected to an L-shaped opening baffle. A stiffening ring plate is provided inside the square tube at a distance D1 from the b4 end upward. The a4 end extends upward beyond the top surface of the integrated floor slab in the middle by B+(10~50)mm, and a hinge is provided on the edge of the a4 end facing the inside of the house.

[0012] Furthermore, the integrated wall system adopts precast wall panels with light steel keel or precast lightweight concrete, and the interior of the wall system can be pre-installed with doors, windows and reserved openings; both ends of the integrated wall system are connected to a pair of first columns or a pair of second columns on the same floor; the integrated floor system is provided with strip-shaped retaining walls at the positions of the extended corner square tubes, and the height of the strip-shaped retaining walls is consistent with the extension height of the corresponding extended corner square tubes.

[0013] Furthermore, the bottom of the sliding support is provided with rollers, and the height of the sliding support is B+(20~30)mm, which is less than the net height of the corresponding extended corner piece extending out of the integrated floor slab.

[0014] Furthermore, the width of the hanging device is less than the inner net width of the short side beam of the integrated floor slab, and the lower end of the hanging device is hinged to the connecting ring plate at the top of the second column; the length of the hanging device extending beyond the bottom surface of the short side beam is B+(20~30)mm, and is less than the net height of the corresponding extended corner piece extending downwards from the integrated floor slab.

[0015] The present invention also provides a construction method for the aforementioned multi-layer Z-shaped folding modular integrated building, including unfolding construction steps and disassembly construction steps; The construction steps include: S1, All components of the multi-layer Z-shaped folding modular integrated building are processed and manufactured in the factory and pre-assembled into a fully folded state; in the fully folded state, the integrated floor slabs of adjacent floors are fixed by temporary locking devices. After the integrated building is transported to the construction site in an overall folded state, it is hoisted into place on the foundation at the designed location. S2, release the temporary locking device between the upper and lower integrated floor slabs of the top floor, lift the top integrated floor slab, so that the first and second columns of the top floor gradually rotate, driving the integrated wall of the top floor to rotate and unfold synchronously, while the remaining lower floors remain completely folded. S3, when the top-level first and second columns are in a fully upright state, the top and bottom ends of each first and second column are fastened to the connecting ring plates at the ends of the corresponding extended corner pieces with bolts. At the same time, the L-shaped opening baffles extending outward from the extended corner pieces are fastened to the side walls of the corresponding first or second columns with bolts to complete the fixing of the top-level structure. S4, release the temporary locking device between the upper and lower integrated floor slabs of the second floor, continue to lift the top integrated floor slab, the upper top structure that has been unfolded is lifted as a whole, so that the first and second columns of the second floor gradually rotate, driving the integrated wall of the second floor to rotate and unfold synchronously. S5, when the first and second columns of the second floor are fully upright, repeat the fastening operation of step S3 to complete the fixation of the second floor structure; S6, release the temporary locking device between the upper and lower integrated floor slabs of the bottom layer, continue to lift the top integrated floor slab, so that the first and second columns of the bottom layer gradually rotate, driving the bottom integrated wall to rotate and unfold synchronously. S7. When the first and second columns at the bottom are fully upright, repeat the fastening operation of step S3 to complete the unfolding construction of the multi-layer Z-shaped folding modular integrated building in this block. S8, hoist the multi-layer Z-shaped folding modular integrated building of the next block as a whole, repeat steps S2-S7 to complete the unfolding construction of the corresponding block; The dismantling and construction steps include: S9, for the multi-layer Z-shaped folding modular integrated building of the block to be dismantled, first release and remove the connecting bolts between the first column, the second column and the corresponding extended corner piece at the bottom, as well as the fastening bolts between the L-shaped opening baffle and the corresponding column side wall; S10, slightly raise the top integrated floor slab, so that the first and second columns of the bottom layer are in a suspended state, install the corresponding sliding supports and hanging devices, adjust the first and second columns to a slightly tilted state, and gradually lower the top integrated floor slab, so that the first and second columns and integrated wall of the bottom layer rotate and fold synchronously until the bottom layer structure is completely folded, and fix the corresponding upper and lower integrated floor slabs of the bottom layer with temporary locking devices. S11, release and remove the connecting bolts between the first and second columns of the second floor and the corresponding extended corner pieces, as well as the fastening bolts between the L-shaped opening baffle and the corresponding column sidewall; slightly lift the top integrated floor slab so that the first and second columns of the second floor are in a suspended state, install the corresponding sliding supports and hanging devices, adjust the first and second columns to a slightly tilted state, gradually lower the top integrated floor slab so that the second floor structure rotates and folds synchronously to a fully folded state, and fix the corresponding upper and lower integrated floor slabs of the second floor with temporary locking devices; S12, release and remove the connecting bolts between the first and second columns of the top floor and the corresponding extended corner pieces, as well as the fastening bolts between the L-shaped opening baffle and the corresponding column sidewall; slightly lift the integrated floor slab at the top, so that the first and second columns of the top floor are in a suspended state, install the corresponding sliding supports and hanging devices, adjust the first and second columns to a slightly tilted state, gradually lower the integrated floor slab at the top, so that the top structure rotates and folds synchronously to a fully folded state, and fix the corresponding upper and lower integrated floor slabs of the top floor with temporary locking devices; S13, at this point the multi-layered Z-shaped folding modular integrated building of this block is in a fully folded state, and the whole structure is hoisted and transferred to the transport vehicle. Repeat steps S9-S12 to complete the disassembly and folding construction of the remaining blocks.

[0016] Compared with existing technologies, the advantages of this invention are as follows: Through an innovative Z-shaped folding mode, the integrated wall system with pre-installed doors, windows, and decorative layers can be folded as a whole, without component compression or collision during the folding process, ensuring good component integrity and eliminating the need for wet work or protective installation procedures on-site. The extended corner pieces and L-shaped opening baffle design not only meet the clear space requirements of the components in the folded state, avoiding compression and collision between folded components, floor slabs, and wall panels, but also form corner reinforcement nodes after unfolding, significantly improving structural rigidity, overall stability, and seismic performance. Adopting a top-down, layer-by-layer unfolding and bottom-up, reverse folding operation mode, only two core processes are required on-site: lifting / lowering the top integrated floor slab and bolt tightening. No high-altitude work is required, enabling rapid construction, disassembly, and reuse of the building. The overall height after full folding is only 1 / 4 to 1 / 6 of the unfolded state, with a volume compression ratio ≥4:1, significantly reducing transportation volume and logistics costs. A small crane can complete the entire lifting operation. All nodes in the design adopt a fully bolted connection structure, which can be disassembled and transported for reuse as a whole, resulting in high turnover efficiency, no construction waste generation, and compliance with the requirements of green building and dual-carbon development. Attached Figure Description

[0017] Figure 1 This invention provides a schematic diagram of a multi-layered Z-shaped folding modular integrated building in its fully unfolded and partially folded states, as provided in an embodiment of the invention. Figure 2 for Figure 1 The diagram shows the structure of the first column and its connection with the integrated wall panel in the embodiment shown. Figure 3 for Figure 1 A schematic diagram of the top part folded and the bottom part completely folded in the embodiment shown. Figure 4 for Figure 1 A schematic diagram of the first extended corner piece at the end of the embodiment shown; Figure 5 for Figure 1 A schematic diagram of the second extended corner piece at the end of the embodiment shown; Figure 6 for Figure 1 A schematic diagram of the structure of the first extended corner piece in the middle of the embodiment shown; Figure 7 for Figure 1 A schematic diagram of the second extended corner piece in the middle of the embodiment shown; Figure 8 for Figure 1 The schematic diagram of the integrated floor slab structure in the central part of the embodiment shown is provided. Figure 9 for Figure 1 A schematic diagram of the assembly and disassembly of the sliding support and hanging device in the embodiment shown; Figure 10A schematic diagram of a three-story Z-shaped modular integrated building in its fully folded state; Figure 11 A schematic diagram illustrating the construction process of a three-story Z-shaped folding modular building. Explanation of the reference numerals in the figure: 1-First column; 11-Connecting ring plate; 12-Trapezoidal rib; 2-Second column; 3-Integrated floor slab; 31-End integrated floor slab; 32-Middle integrated floor slab; 33-Short side beam; 34-Long side beam; 35-Floor slab system; 36-Strip retaining wall; 4-Integrated wall system; 5-Sliding support; 6-Suspension device; 7-Extended corner piece; 71-First extended corner piece at the end; 72-Second extended corner piece at the end; 73-First extended corner piece in the middle; 74-Second extended corner piece in the middle; 75-Square tube; 76-Reinforcing ring plate; 77-L-shaped opening baffle; 8-Hinge. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. The described embodiments are only preferred embodiments of the present invention, and not all embodiments. 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.

[0019] Reference Figures 1 to 11 This embodiment provides a multi-layer Z-shaped folding modular integrated building, the core of which is a three-layer folding structure, including a first column 1, a second column 2, an integrated floor slab 3, an integrated wall 4, a sliding support 5, a hanging device 6, and an extended corner piece 7; Each integrated floor slab 3 has an extended corner piece 7 at its corner, and the first column 1 and the second column 2 of each floor are connected to the corresponding extended corner piece 7. The extended corner piece 7 is a square tube 75 with one end extending a certain distance above the integrated floor slab 3 and a hinge 8 on the edge of the end face facing the inside of the house. The other end is provided with an L-shaped opening baffle 77. The short-side beam 33 of the integrated floor slab 3 adopts a cross-sectional form with a pressure groove on the top surface and an open rolled edge on the bottom section, such as... Figure 9 As shown; the sliding support 5 rests in the groove on the top surface of the short side beam 33 and can slide horizontally along the groove; the hanging device 6 is embedded in the opening below the short side beam 33 and is suspended on the inner side of the rolled edge of the short side beam 33 and can slide horizontally along the rolled edge; the extended corner pieces 7 at both ends of the same short side beam 33 face opposite directions and are respectively connected to the first column 1 and the second column 2; Both ends of the first column 1 and the second column 2 are welded with connecting ring plates 11, such as... Figure 2 As shown; the first column 1 rotates around the top of the column, and its top surface connecting ring plate 11 is hinged to the end face hinge 8 of the extended corner piece 7, and the bottom end connecting ring plate 11 is hinged to the sliding support 5; the second column 2 rotates around the bottom of the column, and its bottom surface connecting ring plate 11 is hinged to the end face hinge 8 of the extended corner piece 7, and the top end is hinged to the hanging device 6. During folding and unfolding, the first column 1 and the second column 2 on the same floor rotate in the same direction and rotate synchronously to form a Z-shaped folding pattern; multiple integrated floor slabs 3 are alternately connected to the first column 1 and the second column 2 on each floor to form a multi-layer foldable building body; the integrated wall 4 is fixedly connected to the first column 1 or the second column 2 on the same floor and rotates synchronously with the first column 1 or the second column 2 and folds as a whole; the multi-layer integrated floor slabs 3 and the integrated wall 4 on both sides form a synchronously rotating Z-shaped staggered folding structure. When folding, the first column 1 and the second column 2 rotate towards each other along their respective hinge connections, and finally achieve horizontal stacking and folding. The integrated wall 4 is diagonally staggered and stored in the gap between the upper and lower integrated floor slabs 3; when unfolding, the upper and lower floor units are vertically pulled apart, and the integrated wall 4 rotates synchronously to a vertical state, forming a closed multi-layer vertical building space together with the upper and lower integrated floor slabs 3.

[0020] In this embodiment, the first column 1 and the second column 2 both have L-shaped open sections with the same cross-sectional dimensions, which is compatible with the existing mature production system. The branch plates are provided with trapezoidal ribs 12 (pressure ribs). The protrusion height of the trapezoidal ribs 12 does not exceed the ring width of the connecting ring plate 11 at the end of the first column 1 and the second column 2. Under the premise of keeping the amount of steel used basically unchanged, the stability, load-bearing capacity and bending stiffness of the column are greatly improved.

[0021] In this embodiment, the integrated floor slab 3 is divided into an end integrated floor slab 31 and a middle integrated floor slab 32 according to its position in the building. The difference between the two lies in the different structures of the extended corner pieces 7, such as... Figure 8 As shown; the integrated floor slab 3 is rectangular in shape and consists of a long side beam 34, a short side beam 33, extended corner pieces 7, and a floor slab system 35. The long side beam 34 and the short side beam 33 are both welded to the side wall of the corresponding extended corner piece 7. The extended corner pieces 7 connected to both ends of the same long side beam 34 have the same orientation, while the extended corner pieces 7 connected to both ends of the same short side beam 33 have opposite orientations.

[0022] In this embodiment, the elongated corner piece 7 is structurally divided into an end first elongated corner piece 71, an end second elongated corner piece 72, a middle first elongated corner piece 73, and a middle second elongated corner piece 74, as follows: Figures 4-7As shown. Let the cross-sectional width of the first column 1 and the second column 2 be B, and the thickness of the integrated floor slab 3 be D1. In this embodiment, B is taken as 150mm, which is suitable for prefabricated integrated wall panels 4 with a thickness of 150mm or less.

[0023] Specifically, the first extended corner piece 71 at the end is constructed as a square tube 75, with connecting ring plates 11 on both the top and bottom ends. The height of the square tube body is B+D1+(10~50)mm. The two ends of the first extended corner piece 71 at the end are marked as end face a1 and end face b1, respectively. End face a1 is flush with the surface of the integrated floor slab 31 at the end. A stiffening ring plate 76 is provided inside the square tube 75 at a distance D1 from end face a1. End face b1 extends out of the integrated floor slab 31 by B+(10~50)mm, and a hinge 8 is provided on the edge of end face b1 facing the inside of the house.

[0024] Specifically, the second extended corner piece 72 at the end is a square tube 75 with an L-shaped opening baffle 77 extending outwards. The extended end is an L-shaped opening baffle 77. The height of the square tube body is D1, and the two end faces are marked as end face a2 and end face b2, respectively, and both are provided with connecting ring plates 11. End face a2 and end face b2 are flush with the upper and lower surfaces of the integrated end floor slab 31, respectively. The L-shaped opening baffle 77 is connected at end face b2 as the extended end, and the height of the L-shaped opening baffle 77 is B + (10~50) mm. The total height of the first extended corner piece 71 at the end and the second extended corner piece 72 at the end is the same, and the extended ends of the two face the same direction.

[0025] Specifically, both the first elongated corner piece 73 and the second elongated corner piece 74 in the middle adopt the structure of connecting one end of the main body of the square tube 75 to the L-shaped opening baffle 77. The height of the main body of the square tube is B+D1+(10~50)mm, and both ends of the square tube 75 are provided with connecting ring plates 11. The height of the L-shaped opening baffle 77 is B+(10~50)mm. The total height of the first elongated corner piece 73 and the second elongated corner piece 74 in the middle is the same, and the extended ends of the L-shaped opening baffle 77 of the two are oriented in opposite directions.

[0026] Specifically, the top end of the square tube of the first extended corner piece 73 in the middle is end a3, and the bottom end is end b3. End a3 is flush with the top surface of the integrated floor slab 32 in the middle and is connected to an L-shaped opening baffle 77. Inside the square tube 75, at a distance D1 from end a3, there is a stiffening ring plate 76. End b3 extends out of the bottom surface of the integrated floor slab 32 by B+(10~50)mm, and the edge of end b3 facing the inside of the house is provided with a hinge 8.

[0027] Specifically, the top end of the square tube of the second extended corner piece 74 in the middle is end a4, and the bottom end is end b4. End b4 is flush with the bottom surface of the integrated floor slab 32 in the middle and is connected to an L-shaped opening baffle 77. Inside the square tube 75, at a distance D1 from end b4 upward, there is a stiffening ring plate 76. End a4 extends upward beyond the top surface of the integrated floor slab 32 in the middle by B+(10~50)mm, and the edge of end a4 facing the inside of the house is provided with a hinge 8.

[0028] In this embodiment, the integrated wall 4 adopts a light steel keel precast wall panel or a light concrete precast wall panel. The interior of the wall can be pre-installed with doors, windows and reserved openings to achieve full decoration prefabrication. The two ends of the integrated wall are connected to a pair of first columns or a pair of second columns on the same floor. The integrated floor slab 3 is provided with a strip-shaped retaining wall 36 at the position of the extended corner piece 7 square tube extension. The height of the strip-shaped retaining wall 36 is consistent with the extension height of the corresponding extended corner piece 7 square tube, which plays a limiting and protective role when folded.

[0029] In this embodiment, the bottom of the sliding support 5 is equipped with rollers, and the height of the sliding support 5 is B + (20~30) mm, which is less than the net height of the corresponding extended corner piece 7 extending out of the integrated floor slab 3, ensuring no interference during the sliding process. The width of the hanging device 6 is less than the net inner width of the short side beam 33 of the integrated floor slab 3, and the lower end of the hanging device 6 is hinged to the connecting ring plate 11 at the top of the second column 2; the length of the hanging device 6 extending beyond the bottom surface of the short side beam 33 is B + (20~30) mm, which is less than the net height of the corresponding extended corner piece 7 extending downwards out of the integrated floor slab 3. The combined design of the sliding support 5 and the hanging device 6 ensures the stability and self-guiding nature of the column rotation during the folding and unfolding process, avoids wall displacement, and improves the smoothness of construction.

[0030] In the fully folded state, temporary locking devices are respectively installed between the integrated floor slabs 3 of adjacent layers. The temporary locking devices can be composed of perforated connecting plates and fastening bolts, and can provide a certain tensile and compressive bearing stiffness and capacity. That is, the temporary locking devices can support part of the self-weight of the integrated floor slab 3 in the fully folded state, or provide a certain tie capacity to the floor slab below it when it is lifted layer by layer.

[0031] This embodiment also provides a construction method for the aforementioned multi-layer Z-shaped folding modular integrated building, including unfolding and disassembly construction steps: (a) Proceeding with the construction steps S1, all building components are processed and manufactured in the factory, and the doors, windows and decoration layers of the pre-installed integrated wall 4 are pre-assembled into a fully folded state; in the fully folded state, the integrated floor slabs 3 of adjacent floors are fixed with temporary locking devices. The overall height after folding is only 2m. After being transported to the construction site in the overall folded state, it is hoisted into place on the foundation at the designed location. S2, release the temporary locking device between the upper and lower integrated floor slabs 3 on the top floor, and lift the top integrated floor slab 3 with a crane, causing the first column 1 and the second column 2 on the top floor to rotate gradually, driving the integrated wall 4 on the top floor to rotate and unfold synchronously, while the remaining lower floors remain completely folded. Figure 3 As shown; S3, when the top first column 1 and the second column 2 are in a completely upright state, the top and bottom ends of each first column 1 and the second column 2 are respectively fastened to the connecting ring plate 11 at the end of the corresponding extended corner piece 7 by bolts. At the same time, the L-shaped opening baffle 77 extending outward from the extended corner piece 7 is fastened to the side wall of the corresponding first column 1 or second column 2 by bolts to complete the fixing of the top structure. S4, release the temporary locking device between the upper and lower integrated floor slabs 3 on the second floor, continue to lift the top integrated floor slab 3, the upper top structure that has been unfolded is lifted as a whole, so that the first column 1 and the second column 2 on the second floor gradually rotate, driving the integrated wall 4 on the second floor to rotate and unfold synchronously. S5, when the first column 1 and the second column 2 of the second floor are in a completely upright state, repeat the fastening operation of step S3 to complete the fixation of the second floor structure; S6, release the temporary locking device between the upper and lower integrated floor slabs 3 at the bottom, continue to lift the top integrated floor slab 3, so that the first column 1 and the second column 2 at the bottom gradually rotate, driving the integrated wall 4 at the bottom to rotate and unfold synchronously. S7, when the first column 1 and the second column 2 at the bottom are in a completely upright state, repeat the fastening operation of step S3 to complete the full unfolding construction of the three-story building in this block; S8, hoist the folded building of the next block as a whole, repeat steps S2-S7 to complete the splicing construction of the multi-block building; (II) Dismantling and Construction Steps S9, for the building of the block to be demolished, first release and remove the connecting bolts between the first column 1, the second column 2 and the corresponding extended corner piece 7 at the bottom, as well as the fastening bolts between the L-shaped opening baffle 77 and the corresponding column side wall; S10, slightly raise the top integrated floor slab 3 so that the first column 1 and the second column 2 of the bottom layer are in a suspended state, install the corresponding sliding support 5 and hanging device 6, adjust the first column 1 and the second column to a slightly tilted state, and gradually lower the top integrated floor slab 3 so that the first column 1, the second column 2 and the integrated wall 4 of the bottom layer rotate and fold synchronously until the bottom layer structure is completely folded, and fix the corresponding upper and lower integrated floor slab 3 of the bottom layer with a temporary locking device; S11, release and remove the connecting bolts between the first column 1 and the second column 2 on the second floor and the corresponding extended corner piece 7, as well as the fastening bolts between the L-shaped opening baffle 77 and the corresponding column sidewall; slightly lift the top integrated floor slab 3 so that the first column 1 and the second column 2 on the second floor are in a suspended state, install the corresponding sliding support 5 and the hanging device 6, adjust the first column 1 and the second column 2 to a slightly tilted state, gradually lower the top integrated floor slab 3 so that the second floor structure can be rotated and folded synchronously to a fully folded state, and fix the corresponding upper and lower integrated floor slabs 3 on the second floor with temporary locking devices; S12, release and remove the connecting bolts between the first column 1 and the second column 2 of the top floor and the corresponding extended corner pieces, as well as the fastening bolts between the L-shaped opening baffle and the corresponding column side wall, slightly raise the top integrated floor slab 3 so that the first column 1 and the second column 2 of the top floor are in a suspended state, install the corresponding sliding support 5 and the hanging device 6, adjust the first column 1 and the second column 2 to a slightly tilted state, gradually lower the top integrated floor slab 3 so that the top floor structure rotates and folds synchronously to a fully folded state, and fix the corresponding upper and lower integrated floor slabs 3 of the top floor with temporary locking devices; S13, at this point the building in this block is fully folded and hoisted and transported to a transport vehicle. Repeat steps S9-S12 to complete the dismantling of the remaining blocks.

[0032] This invention utilizes an innovative Z-shaped folding mechanism to achieve seamless folding of integrated wall panels with pre-installed doors, windows, and decorative layers. The folding process avoids component compression and collision, ensuring component integrity and eliminating the need for wet work or protective installation procedures on-site. The extended corner pieces and L-shaped opening baffle design not only meet the clearance requirements for components in the folded state, preventing compression and collision between folded components, floor slabs, and wall panels, but also create reinforced corner nodes after unfolding, significantly improving structural rigidity, overall stability, and seismic performance. Employing a top-down, layer-by-layer unfolding and bottom-up, reverse folding operation mode, only two core processes are required on-site: lifting / lowering the top integrated floor slab and bolt tightening. No high-altitude work is needed, enabling rapid assembly, disassembly, and reuse of the building. The overall height after full folding is only 1 / 4 to 1 / 6 of the unfolded state, with a volume compression ratio of ≥4:1, significantly reducing transportation volume and logistics costs. A small crane can complete the entire lifting operation. All nodes in the design adopt a fully bolted connection structure, which can be disassembled and transported for reuse as a whole, resulting in high turnover efficiency, no construction waste generation, and compliance with the requirements of green building and dual-carbon development.

[0033] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other modifications under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these modifications are within the scope of protection of the present invention.

Claims

1. A multi-layered Z-shaped folding modular integrated building, characterized by: Includes the first column, the second column, the integrated floor slab, the integrated wall system, the sliding support, the hanging device, and the extended corner fittings; Each integrated floor slab is equipped with an extended corner piece at its corner, and the first and second columns of each floor are connected to the corresponding extended corner pieces. The extended corner piece is a square tube structure, with one end extending a certain distance above the integrated floor slab and a hinge on the edge of the end face facing the inside of the building, and an L-shaped opening baffle on the other end. The integrated floor slab has a short-side beam with a groove on the top surface and an open rolled edge on the bottom section. The sliding support rests in the groove on the top surface of the short-side beam and can slide or roll horizontally along the groove. The hanging device is embedded in the opening below the short-side beam and suspended inside the rolled edge of the short-side beam, and can slide or roll horizontally along the rolled edge. The extended corner pieces at both ends of the same short-side beam face opposite directions and are respectively connected to the first column and the second column. Both ends of the first and second columns are provided with connecting ring plates; the first column rotates around the top of the column, and its top connecting ring plate is hinged to the end face of the extended corner piece, and its bottom connecting ring plate is hinged to the sliding support; the second column rotates around the bottom of the column, and its bottom connecting ring plate is hinged to the end face of the extended corner piece, and its top is hinged to the hanging device. During the folding and unfolding process, the first and second columns on the same floor rotate in the same direction and rotate synchronously to form a Z-shaped folding pattern; multiple integrated floor slabs are alternately connected to the first and second columns on each floor to form a multi-layer foldable building body; the integrated wall is fixedly connected to the first or second column on the same floor and rotates synchronously with the first or second column and folds as a whole.

2. The multi-layer Z-shaped folding modular integrated building according to claim 1, characterized in that: The first and second columns both have L-shaped open sections with the same cross-sectional dimensions; their limb plates are provided with pressure ribs, and the protrusion height of the pressure ribs does not exceed the ring width of the connecting ring plate at the end of the first and second columns.

3. The multi-layer Z-shaped folding modular integrated building according to claim 1, characterized in that: The integrated floor slab is divided into end integrated floor slabs and middle integrated floor slabs according to its position in the building. The difference between the two lies in the different structures of the extended corner pieces. The integrated floor slab is rectangular in shape and consists of long side beams, short side beams, extended corner pieces, and a floor slab system. The long side beams and short side beams are welded to the side walls of the corresponding extended corner pieces. The extended corner pieces connected to both ends of the same long side beam face the same direction, while the extended corner pieces connected to both ends of the same short side beam face opposite directions.

4. The multi-layer Z-shaped folding modular integrated building according to claim 2, characterized in that: The extended corner pieces are classified according to their structural form into a first extended corner piece at the end, a second extended corner piece at the end, a first extended corner piece in the middle, and a second extended corner piece in the middle.

5. The multi-layer Z-shaped folding modular integrated building according to claim 4, characterized in that: The first extended corner piece at the end is a square tube with connecting ring plates on both the top and bottom faces. When the cross-sectional width of the first column and the second column is B and the thickness of the integrated floor slab at the end is D1, the height of the square tube body is B+D1+(10~50)mm. The two ends of the first extended corner piece at the end are marked as end face a1 and end face b1, respectively. End face a1 is flush with the surface of the integrated floor slab at the end. A stiffening ring plate is provided inside the square tube at a distance D1 from end face a1. End face b1 extends out of the integrated floor slab at the end by B+(10~50)mm, and a hinge is provided on the edge of end face b1 facing the inside of the building. The second extended corner piece at the end is a square tube with an L-shaped opening baffle structure, and the extended end is an L-shaped opening baffle; the height of its square tube body is D1, and the two end faces are marked as a2 end face and b2 end face respectively, and both are provided with connecting ring plates; the a2 end face and the b2 end face are flush with the upper and lower surfaces of the integrated end floor slab respectively, and the b2 end face is connected to an L-shaped opening baffle as the extended end, and the height of the L-shaped opening baffle is B+(10~50)mm; The total height of the first and second extended corner pieces at the ends is the same, and their protruding ends face the same direction.

6. The multi-layer Z-shaped folding modular integrated building according to claim 4, characterized in that: Both the first and second extended corner pieces in the middle section adopt a structure in which a square tube body is connected to an L-shaped opening baffle at one end. The height of the square tube body is B+D1+(10~50)mm, and both ends of the square tube are provided with connecting ring plates. The height of the L-shaped opening baffle is B+(10~50)mm. The total height of the first and second extended corner pieces in the middle section is the same, and the extended ends of the L-shaped opening baffles of the two pieces face opposite directions. The top end of the square tube of the first extended corner piece in the middle is a3 end, and the bottom end is b3 end. The a3 end is flush with the top surface of the integrated floor slab in the middle and is connected to an L-shaped opening baffle. A stiffening ring plate is provided inside the square tube at a distance D1 from the a3 end. The b3 end extends out of the bottom surface of the integrated floor slab in the middle by B+(10~50)mm, and a hinge is provided on the edge of the b3 end facing the inside of the house. The top end of the square tube of the second extended corner piece in the middle is a4 end, and the bottom end is b4 end. The b4 end is flush with the bottom surface of the integrated floor slab in the middle and is connected to an L-shaped opening baffle. A stiffening ring plate is provided inside the square tube at a distance D1 from the b4 end upward. The a4 end extends upward beyond the top surface of the integrated floor slab in the middle by B+(10~50)mm, and a hinge is provided on the edge of the a4 end facing the inside of the house.

7. The multi-layer Z-shaped folding modular integrated building according to claim 1, characterized in that: The integrated wall system uses precast wall panels made of light steel keel or precast lightweight concrete. Doors, windows and reserved openings can be pre-installed inside the wall system. The two ends of the integrated wall system are connected to a pair of first columns or a pair of second columns on the same floor. The integrated floor system has strip retaining walls at the positions of the extended corner square tubes, and the height of the strip retaining walls is consistent with the extension height of the corresponding extended corner square tubes.

8. The multi-layer Z-shaped folding modular integrated building according to claim 1, characterized in that: The bottom of the sliding support is provided with rollers, and the height of the sliding support is B+(20~30)mm, which is less than the net height of the corresponding extended corner piece extending out of the integrated floor slab.

9. The multi-layer Z-shaped folding modular integrated building according to claim 1, characterized in that: The width of the hanging device is less than the inner net width of the short side beam of the integrated floor slab. The lower end of the hanging device is hinged to the connecting ring plate at the top of the second column. The length of the hanging device extending beyond the bottom surface of the short side beam is B+(20~30)mm, and is less than the net height of the corresponding extended corner piece extending downwards from the integrated floor slab.

10. A construction method for a multi-layer Z-shaped folding modular integrated building as described in any one of claims 1-9, characterized in that: This includes both the construction and dismantling steps. The construction steps include: S1, All components of the multi-layer Z-shaped folding modular integrated building are processed and manufactured in the factory and pre-assembled into a fully folded state; in the fully folded state, the integrated floor slabs of adjacent floors are fixed by temporary locking devices. After the integrated building is transported to the construction site in an overall folded state, it is hoisted into place on the foundation at the designed location. S2, release the temporary locking device between the upper and lower integrated floor slabs of the top floor, lift the top integrated floor slab, so that the first and second columns of the top floor gradually rotate, driving the integrated wall of the top floor to rotate and unfold synchronously, while the remaining lower floors remain completely folded. S3, when the top-level first and second columns are in a fully upright state, the top and bottom ends of each first and second column are fastened to the connecting ring plates at the ends of the corresponding extended corner pieces with bolts. At the same time, the L-shaped opening baffles extending outward from the extended corner pieces are fastened to the side walls of the corresponding first or second columns with bolts to complete the fixing of the top-level structure. S4, release the temporary locking device between the upper and lower integrated floor slabs of the second floor, continue to lift the top integrated floor slab, the upper top structure that has been unfolded is lifted as a whole, so that the first and second columns of the second floor gradually rotate, driving the integrated wall of the second floor to rotate and unfold synchronously. S5, when the first and second columns of the second floor are fully upright, repeat the fastening operation of step S3 to complete the fixation of the second floor structure; S6, release the temporary locking device between the upper and lower integrated floor slabs of the bottom layer, continue to lift the top integrated floor slab, so that the first and second columns of the bottom layer gradually rotate, driving the bottom integrated wall to rotate and unfold synchronously. S7. When the first and second columns at the bottom are fully upright, repeat the fastening operation of step S3 to complete the unfolding construction of the multi-layer Z-shaped folding modular integrated building in this block. S8, hoist the multi-layer Z-shaped folding modular integrated building of the next block as a whole, repeat steps S2-S7 to complete the unfolding construction of the corresponding block; The dismantling and construction steps include: S9, for the multi-layer Z-shaped folding modular integrated building of the block to be dismantled, first release and remove the connecting bolts between the first column, the second column and the corresponding extended corner piece at the bottom, as well as the fastening bolts between the L-shaped opening baffle and the corresponding column side wall; S10, slightly raise the top integrated floor slab, so that the first and second columns of the bottom layer are in a suspended state, install the corresponding sliding supports and hanging devices, adjust the first and second columns to a slightly tilted state, and gradually lower the top integrated floor slab, so that the first and second columns and integrated wall of the bottom layer rotate and fold synchronously until the bottom layer structure is completely folded, and fix the corresponding upper and lower integrated floor slabs of the bottom layer with temporary locking devices. S11, release and remove the connecting bolts between the first and second columns of the second floor and the corresponding extended corner pieces, as well as the fastening bolts between the L-shaped opening baffle and the corresponding column sidewall; slightly lift the top integrated floor slab so that the first and second columns of the second floor are in a suspended state, install the corresponding sliding supports and hanging devices, adjust the first and second columns to a slightly tilted state, gradually lower the top integrated floor slab so that the second floor structure rotates and folds synchronously to a fully folded state, and fix the corresponding upper and lower integrated floor slabs of the second floor with temporary locking devices; S12, release and remove the connecting bolts between the first and second columns of the top floor and the corresponding extended corner pieces, as well as the fastening bolts between the L-shaped opening baffle and the corresponding column sidewall; slightly lift the integrated floor slab at the top, so that the first and second columns of the top floor are in a suspended state, install the corresponding sliding supports and hanging devices, adjust the first and second columns to a slightly tilted state, gradually lower the integrated floor slab at the top, so that the top structure rotates and folds synchronously to a fully folded state, and fix the corresponding upper and lower integrated floor slabs of the top floor with temporary locking devices; S13, at this point the multi-layered Z-shaped folding modular integrated building of this block is in a fully folded state, and the whole structure is hoisted and transferred to the transport vehicle. Repeat steps S9-S12 to complete the disassembly and folding construction of the remaining blocks.

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