A kind of asymmetrically staggered symmetrical trapezoidal configuration corrugated paper wallboard structure, fabricated wall structure system

Abstract

This invention relates to an anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure and a prefabricated wall structure system. The anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure includes: multiple corrugated cardboard wall panels arranged horizontally and vertically, each panel being connected by two corrugated cardboard wall panel units. Each corrugated cardboard wall panel unit includes: two facing corrugated cardboard sheets, spaced apart and opposite each other, with the corrugation direction perpendicular to the height direction of the corrugated cardboard wall panel unit; two interlayer corrugated cardboard sheets disposed between the two facing corrugated cardboard sheets, with the corrugation direction parallel to the height direction of the corrugated cardboard wall panel unit; a middle layer corrugated cardboard sheet disposed between the two interlayer corrugated cardboard sheets, with the corrugation direction perpendicular to the height direction of the corrugated cardboard wall panel unit; and a connecting frame with multiple partitioned spaces along the horizontal and vertical directions for correspondingly installing and fixing the multiple corrugated cardboard wall panels. The anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure of the present invention has the characteristics of superior structural mechanical properties, standardized and modular components, simple manufacturing process, economy and environmental protection, and is especially suitable for the rapid construction of temporary emergency buildings in emergency situations such as natural disasters or man-made crises.

Description

Technical Field

[0001] This invention relates to the field of building structure technology, and in particular to a corrugated cardboard wall suitable for the construction of emergency buildings and temporary structures made of cardboard, specifically to a corrugated cardboard wall panel structure with an oppositely overlapping symmetrical trapezoidal structure and a prefabricated wall structure system. Background Technology

[0002] In emergency situations such as natural disasters or man-made crises, it is necessary to quickly construct temporary emergency buildings to meet the basic survival and safety needs of disaster victims and rescue personnel. Some short-cycle, frequently replaced structures such as exhibitions, decorative partitions, and architectural features also require temporary rapid construction systems and corresponding construction materials.

[0003] Cardboard-structured emergency buildings and temporary structures use corrugated cardboard as the base material to create structural components such as beams, slabs, columns, and walls, serving as the load-bearing system and enclosure structure of the buildings and structures. Corrugated cardboard, as a mature industrial product, boasts excellent processing performance, mechanical properties, and quality control standards. It also offers advantages such as being eco-friendly (recyclable, reusable, and biodegradable), readily available locally, low-cost, easy to process and assemble, lightweight, and safe. Therefore, using corrugated cardboard as the base material for constructing paper-structured emergency buildings and temporary structures offers advantages such as lightweight safety, economy, and eco-friendliness. Furthermore, to meet the rapid construction needs in emergency scenarios and achieve modular factory construction, designing standardized and modular structural components is essential.

[0004] Currently, the use of corrugated cardboard as a substrate for constructing emergency paper structures is still a blank in both domestic and international design research and practical construction fields. Although there are numerous design examples and practices for temporary structures such as temporary exhibitions, decorative partitions, and architectural features, there are no examples of corrugated cardboard composite wall panels that simultaneously meet the above requirements. Furthermore, existing corrugated cardboard generally has relatively weak load-bearing capacity, making it difficult to use as wall panels for emergency buildings. Therefore, it is essential to design a corrugated cardboard wall panel that meets the above requirements and is suitable for the construction of emergency buildings and temporary structures. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the main objective of the present invention is to provide an anisotropic overlapping symmetrical trapezoidal corrugated cardboard wall panel structure and a prefabricated wall structure system to solve one or more problems in the prior art.

[0006] The technical solution of the present invention is as follows:

[0007] This invention first provides a corrugated cardboard wall panel structure with an anisotropic overlapping symmetrical trapezoidal structure, comprising:

[0008] Multiple corrugated cardboard wall panels are arranged horizontally and vertically. Each corrugated cardboard wall panel is composed of at least two corrugated cardboard wall panel units connected together. Each corrugated cardboard wall panel unit includes:

[0009] Two pieces of corrugated cardboard are placed opposite each other with a gap between them. Each piece of corrugated cardboard has at least one corrugated layer. The corrugation direction of the corrugated layer is perpendicular to the height direction of the corrugated cardboard wall panel unit.

[0010] Two sandwich corrugated cardboard sheets are disposed between the two surface corrugated cardboard sheets. Each sandwich corrugated cardboard sheet has at least one corrugated layer, and the corrugation direction of the corrugated layer is parallel to the height direction of the corrugated cardboard wall panel unit.

[0011] A middle corrugated cardboard is disposed between two sandwich corrugated cardboard sheets. The middle corrugated cardboard sheet has at least one corrugated layer. The corrugation direction of the corrugated layer is perpendicular to the height direction of the corrugated cardboard wall panel unit, and the two sandwich corrugated cardboard sheets are mirror-symmetrical on both sides of the middle corrugated cardboard sheet.

[0012] The connecting frame has multiple partitioned spaces along the horizontal and vertical directions for correspondingly installing and fixing multiple corrugated cardboard wall panels to form an anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure.

[0013] As a further improvement to any of the above solutions, each corrugated cardboard wall panel unit also includes two sealing plates, each of which is disposed on both sides of the corrugated cardboard wall panel unit and is bonded to the surfaces of the two surface corrugated cardboard sheets.

[0014] As a further improvement to any of the above schemes, each of the sandwich corrugated cardboard pieces is bent into a wave shape with several positive and negative trapezoids connected together along the length direction of the corrugated cardboard wall panel unit, and the several positive and negative trapezoids of two sandwich corrugated cardboard pieces are mirror symmetrical.

[0015] As a further improvement to any of the above solutions, the connecting frame is composed of a first outer frame, a second outer frame, a first middle frame, and a second middle frame connected together. Two sets of the first outer frames are vertically arranged on the left and right edges of the multiple corrugated cardboard wall panels, and two sets of the second outer frames are horizontally arranged on the upper and lower edges of the multiple corrugated cardboard wall panels and connected to the two sets of the first outer frames. At least one set of the first middle frames is vertically connected between the two sets of the second outer frames, and at least one set of the second middle frames is horizontally connected between the two sets of the first outer frames. The first outer frame, the second outer frame, the first middle frame, and the second middle frame are connected to form multiple partition spaces, and the multiple corrugated cardboard wall panels are respectively clamped and fixed in the partition spaces.

[0016] As a further improvement to any of the above solutions, the first outer frame is a slotted frame, and its slot faces the corrugated cardboard wall panel; and / or, the second outer frame is a slotted frame, and its slot faces the corrugated cardboard wall panel; and / or, the first middle frame is an I-shaped frame, and its slot faces the corrugated cardboard wall panel; and / or, the second middle frame is an I-shaped frame, and its slot faces the corrugated cardboard wall panel.

[0017] As a further improvement to any of the above solutions, the first outer frame, the second outer frame, the first middle frame, and the second middle frame are connected and fixed by connecting plates. The connecting plates include connecting plate one, connecting plate two, connecting plate three, and connecting plate four. The connecting plate one is used to connect the first outer frame and the second outer frame, the connecting plate two is used to connect the second middle frame and the first outer frame, the connecting plate three is used to connect the first middle frame and the second outer frame, and the connecting plate four is used to connect the first middle frame and the second middle frame.

[0018] As a further improvement to any of the above solutions, it also includes multiple vertical reinforcing ribs, which are vertically spaced within the corrugations of the corrugated cardboard wall panel unit. The corrugations are filled with polyester foam, and each vertical reinforcing rib penetrates at least two of the corrugated cardboard wall panels vertically, with both ends connected and fixed to the connecting frame.

[0019] As a further improvement to any of the above solutions, two corrugated cardboard wall panel units forming each corrugated cardboard wall panel are interlocked laterally, wherein one corrugated cardboard wall panel unit has an interlocking protrusion glued to its vertical edge, and the other corrugated cardboard wall panel unit has an interlocking concave plate glued to its corresponding vertical edge, the interlocking protrusion and the interlocking concave plate being adapted for insertion and interlocking connection; and / or

[0020] Two corrugated cardboard wall panel units forming each corrugated cardboard wall panel are vertically interlocked. In each corrugated cardboard wall panel unit, one of the interlayer corrugated cardboard extends outward by a predetermined length along one side of the corrugated cardboard wall panel unit, while the other interlayer corrugated cardboard contracts inward by a predetermined length along one side of the corrugated cardboard wall panel unit to form a contraction space. The two corrugated cardboard wall panel units are connected by inserting the extended length of one interlayer corrugated cardboard into the contraction space of the other interlayer corrugated cardboard.

[0021] The present invention further provides an assembled wall structure system based on the above-mentioned anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure, characterized in that corrugated cardboard columns are provided at both ends of the anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure, and the corrugated cardboard columns are connected and fixed to the anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure through connecting components.

[0022] As a further improvement to any of the above solutions, the connection component includes:

[0023] Connecting square tubes, a plurality of the connecting square tubes being fitted at least at the top, bottom and middle of the corrugated cardboard column, and one side of each of the connecting square tubes abutting against the connecting frame of the anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure;

[0024] L-shaped connecting plates are symmetrically arranged on both sides of each connecting square tube that abuts against the connecting frame. One side of each L-shaped connecting plate is riveted to the connecting square tube, and the other side is riveted to the connecting frame.

[0025] The advantages of this invention over existing technologies are as follows: This invention proposes an anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure. This structure has the characteristics of superior structural mechanical properties, standardized and modular components, simple manufacturing process, economy and environmental protection, and high load-bearing capacity. Specifically, it has at least the following practical effects:

[0026] The anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure of the present invention uses corrugated cardboard as raw material, which has the advantages of being recyclable, low-carbon and environmentally friendly, and inexpensive.

[0027] The anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure of the present invention is composed of multiple corrugated cardboard wall panels connected by a connecting frame. Each corrugated cardboard wall panel includes two corrugated cardboard wall panel units. Each corrugated cardboard wall panel unit adopts a standard module, which is simple to manufacture. It is easy to make by hand or to be prefabricated in the factory, which meets the emergency and temporary characteristics of emergency buildings and temporary structures.

[0028] Each corrugated cardboard wall panel unit of this invention adopts an anti-directional overlapping structure. The corrugated directions of the symmetrically arranged surface corrugated cardboard, sandwich corrugated cardboard, and middle corrugated cardboard are transverse-longitudinal-transverse-longitudinal-transverse in sequence. The alternating use of transverse and longitudinal corrugated cardboard gives the wall panel good load-bearing capacity and deformation resistance in all directions, ensuring its superior mechanical properties under both vertical and horizontal loads.

[0029] Each corrugated cardboard wall panel unit of the present invention consists of a surface corrugated cardboard and a sandwich corrugated cardboard bent into a trapezoidal wave shape, mirror-symmetrical with the middle corrugated cardboard as the symmetrical plane, and is bonded together to form a closed honeycomb core. This ensures that the wall panel has both the mechanical characteristics of a honeycomb structure and a corrugated board structure, with high structural rigidity, high vertical load-bearing capacity, and stable deformation under vertical force.

[0030] The present invention utilizes an anisotropic, overlapping, symmetrical trapezoidal corrugated cardboard wall panel structure connected to corrugated cardboard columns to form a prefabricated wall structure system. This prefabricated wall structure system employs a dry construction method, eliminating the need for wet work during on-site installation and significantly shortening the construction cycle. It is also suitable for the construction of emergency buildings and temporary structures using cardboard structures, enabling both factory prefabrication and rapid on-site fabrication.

[0031] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description. Furthermore, implementation of any embodiment of the present invention does not imply the simultaneous possession or achievement of multiple or all of the aforementioned beneficial effects. Attached Figure Description

[0032] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0033] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0034] Figure 1 This is a schematic diagram of the anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure according to some embodiments of the present invention (two corrugated cardboard wall panel units are connected laterally);

[0035] Figure 2 for Figure 1 The top and side views are shown in the diagram, where (a) is the top view and (b) is the side view.

[0036] Figure 3 A schematic diagram of the anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure according to some embodiments of the present invention (two corrugated cardboard wall panel units are connected vertically);

[0037] Figure 4 for Figure 3 The top and side views are shown in the diagram, where (a) is the top view and (b) is the side view.

[0038] Figure 5The diagram shows the structure of a corrugated cardboard wall panel unit according to some embodiments of the present invention, wherein (a) is the elevation of the corrugated cardboard wall panel unit and (b) is the top surface of the corrugated cardboard wall panel unit;

[0039] Figure 6 This is an exploded view of the corrugated cardboard wall panel unit structure according to some embodiments of the present invention;

[0040] Figure 7 The diagram shows a partial structural schematic of a corrugated cardboard wall panel unit structure according to some embodiments of the present invention, wherein (a) is the surface corrugated cardboard structure, (b) is the middle corrugated cardboard structure, and (c) is the sealing board structure.

[0041] Figure 8 This is a schematic diagram illustrating the formation process of a sandwich corrugated cardboard structure according to some embodiments of the present invention;

[0042] Figure 9 This is a connection diagram of some embodiments of the present invention, showing how two adjacent corrugated cardboard wall panel units are connected laterally using a snap-fit ​​plate.

[0043] Figure 10 This is a schematic diagram illustrating the vertical connection of two adjacent corrugated cardboard wall panel units using an interlocking connection, according to some embodiments of the present invention.

[0044] Figure 11 for Figure 10 A schematic diagram of the front and side views of the connection, where (a) is the front view and (b) is the side view;

[0045] Figure 12 This is a schematic diagram of a partial structure of the connecting frame using connecting plates in some embodiments of the present invention;

[0046] Figure 13 for Figure 12 Detailed structural diagrams of the local area;

[0047] Figure 14 The diagram shows the structural components of the connecting frame in some embodiments of the present invention, wherein (a) is the first outer frame, (b) is the first middle frame, (c) is the second outer frame, and (d) is the second middle frame;

[0048] Figure 15 The diagram shows the hole structure of some embodiments of the present invention, wherein (a) is a hole provided in the second outer frame, and (b) is a hole provided in the second middle frame;

[0049] Figure 16 This is a schematic diagram of a prefabricated wall structure system according to some embodiments of the present invention (two corrugated cardboard wall panel units are connected laterally);

[0050] Figure 17This is a schematic diagram of a prefabricated wall structure system according to some embodiments of the present invention (two corrugated cardboard wall panel units are connected vertically).

[0051] Figure 18 This is a top view schematic diagram of a prefabricated wall structure system according to some embodiments of the present invention, wherein (a) is Figure 16 The top surface, (b) is Figure 17 The top surface;

[0052] Figure 19 This is a schematic diagram illustrating the connection of corrugated cardboard columns using connecting components and anisotropically overlapping symmetrical trapezoidal construction for corrugated cardboard wall panel structures, according to some embodiments of the present invention.

[0053] Marked in the image:

[0054] 100-Anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure;

[0055] 100a - Corrugated cardboard wall panel; 1 - Corrugated cardboard wall panel unit; 101 - Top layer corrugated cardboard; 102 - Middle layer corrugated cardboard; 102a - Predetermined length; 102b - Shrinkage space; 103 - Middle layer corrugated cardboard; 104 - Sealing plate; 2 - Snap-on plate; 201 - Snap-on convex plate; 2011 - Protrusion; 202 - Snap-on concave plate; 2021 - Groove; 3 - Connecting plate; 301 - Connecting plate one; 3011 - Rectangular plate one; 302 - Connecting plate two; 3021 - Rectangular plate two; 303 - Connecting plate three; 3031 - Rectangular plate three; 304 - Connecting plate four; 3041 - Rectangular plate four; 4 - Vertical reinforcing rib; 5 - Hole;

[0056] 100b - Connecting frame; 101b - First outer frame; 102b - Second outer frame; 103b - First middle frame; 104b - Second middle frame;

[0057] 200-Corrugated cardboard column;

[0058] 300 - Connecting assembly; 300a - Connecting square tube; 300b - L-shaped connecting plate;

[0059] In the various figures, the same or corresponding reference numerals indicate the same or corresponding parts. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0061] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0062] It should be understood that the terms "comprising / including," "consisting of," or any other variations are intended to cover non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements includes not only those elements but may also include, where necessary, other elements not expressly listed, or elements inherent to such a product, apparatus, process, or method. Without further limitation, an element defined by the phrases "comprising / including," "consisting of," does not exclude the presence of additional identical elements in the product, apparatus, process, or method that includes said element.

[0063] It should also be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device, component or structure referred to must have a specific orientation, be constructed or operated in a specific orientation, and should not be construed as a limitation of the present invention.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0065] This invention proposes an anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure. This anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure uses corrugated cardboard as the base material to make basic load-bearing components suitable for emergency buildings and temporary structures. This anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure meets the following requirements: reasonable structure, stable stress, safe and reliable, and realizes the standardization and modularization of structural components to suit the requirements of modular construction in factories.

[0066] The implementation of the present invention will be described in detail below with reference to preferred embodiments.

[0067] See Figures 1 to 15The anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure 100 proposed in this invention is formed by connecting multiple corrugated cardboard wall panels 100a using a connecting frame 100b. The multiple corrugated cardboard wall panels 100a are arranged horizontally and vertically, and each corrugated cardboard wall panel 100a includes two corrugated cardboard wall panel units 1, which are connected horizontally or vertically to form the aforementioned corrugated cardboard wall panel 100a. The connecting frame 100b has multiple partition spaces along the horizontal and vertical directions, and the multiple corrugated cardboard wall panels 100a are respectively clamped and fixed within these partition spaces.

[0068] See Figure 5 (a) and (b) in Figure 6 Each corrugated cardboard wall panel unit 1 is composed of two surface corrugated cardboard pieces 101, two interlayer corrugated cardboard pieces 102, and one middle corrugated cardboard piece 103 connected together. The two surface corrugated cardboard pieces 101 are spaced apart, and each surface corrugated cardboard piece 101 has at least one corrugated layer. (See [reference]). Figure 7 In (a), the corrugation direction of the corrugated layer is perpendicular to the height direction of the corrugated cardboard wall panel unit 1. Two interlayer corrugated cardboard 102 are disposed between two surface corrugated cardboard 101. The opposite sides of the two interlayer corrugated cardboard 102 are respectively bonded to the opposite surface corrugated cardboard 101. Each interlayer corrugated cardboard 102 has at least one corrugated layer. See [reference needed]. Figure 8 The corrugated direction of the corrugated layer is parallel to the height direction of the corrugated cardboard wall panel unit 1; the middle corrugated cardboard 103 is disposed between two sandwich corrugated cardboard 102 and is bonded to the two sandwich corrugated cardboard 102; the middle corrugated cardboard 103 has at least one corrugated layer, see [reference]. Figure 7 In (b), the corrugation direction of the corrugated layer is perpendicular to the height direction of the corrugated cardboard wall panel unit 1.

[0069] In this invention, each corrugated cardboard wall panel unit 1 adopts an anti-directional overlapping structure, resulting in superior load-bearing performance. Each corrugated cardboard wall panel unit 1 consists of two surface corrugated cardboard pieces 101, two interlayer corrugated cardboard pieces 102, and one middle layer corrugated cardboard piece 103, forming a composite wall panel. The corrugated cardboard pieces within this wall panel employ an anti-directional overlapping design of transverse-longitudinal-transverse-longitudinal-transverse. The alternating use of transverse and longitudinal corrugated cardboard ensures that the wall panel has good load-bearing capacity and deformation resistance in all directions, guaranteeing superior mechanical properties under both vertical and horizontal loads. This makes it particularly suitable for load-bearing walls in emergency buildings and temporary structures. More precisely, under vertical loads, the vertical corrugated board bears the main load, while the transverse corrugated board ensures the stability of the wall panel's deformation; under horizontal forces, the transverse corrugated board bears the main load.

[0070] In some embodiments, the surface corrugated cardboard 101 is preferably a five-layer corrugated cardboard to ensure that the surface layer has a certain out-of-plane strength and rigidity.

[0071] In some embodiments, the sandwich corrugated cardboard 102 is preferably five-layer or seven-layer corrugated cardboard. Since the wall is mainly subjected to vertical pressure, the sandwich folded trapezoidal structure and vertical corrugation allow five-layer or seven-layer boards to achieve higher load-bearing capacity.

[0072] In some embodiments, the middle layer corrugated cardboard 103 is preferably a three-layer corrugated cardboard. The middle layer is a connecting layer and bears less stress, while the three-layer design is economical.

[0073] In this invention, each corrugated cardboard wall panel unit 1 uses corrugated cardboard with different structural layers for each layer. The surface corrugated cardboard 101, the interlayer corrugated cardboard 102, and the middle corrugated cardboard 103 are preferably selected from two schemes: a five-layer-five-layer-three-layer combination or a five-layer-seven-layer-three-layer combination, in order to ensure economy under the premise of better structural stress.

[0074] In some embodiments, see Figure 5 Images (a) and (b) are shown in the diagram. Image (a) is an elevation view of corrugated cardboard wall panel unit 1, and image (b) is a top view of corrugated cardboard wall panel unit 1. Each corrugated cardboard wall panel unit 1 also includes two sealing plates 104. Each sealing plate 104 is located on the left and right sides of the corrugated cardboard wall panel unit 1 and is bonded to the left and right edges of the two surface corrugated cardboard sheets 101. The sealing plates 104 mainly serve to seal the sides of the wall panel, reduce the erosion of the internal structure of the wall panel by external factors, and ensure the flatness of the side of the wall panel.

[0075] See also Figure 7 In (c), the sealing plate 104 is [shaped] and is made of flat corrugated cardboard folded together. This allows it to be tightly fitted to the outer edge of the corrugated cardboard wall panel unit 1.

[0076] In some embodiments, the sealing board 104 is preferably a three-layer corrugated cardboard.

[0077] See Figure 5 In (a) and (b), each piece of interlayer corrugated cardboard 102 is bent into several interconnected trapezoidal waves along the length of the corrugated cardboard wall panel unit 1, and two wavy pieces of interlayer corrugated cardboard are symmetrically spliced ​​together to form a honeycomb core. This ensures that the corrugated cardboard wall panel unit 1 possesses both the mechanical characteristics of a honeycomb structure and a corrugated board structure, resulting in stable stacked compression deformation under vertical loads. The honeycomb structure has strong spatial stability, and the wall formed by a single row of honeycomb structures has greater rigidity and more stable deformation. At the same time, since the honeycomb direction of the honeycomb core is parallel to the height direction of the corrugated cardboard wall panel unit 1, it is beneficial to improve the vertical bearing capacity of the wall panel, enabling the wall panel to more effectively distribute and transfer forces when bearing vertical loads.

[0078] In this invention, in order to improve the vertical load-bearing capacity of the corrugated cardboard wall panel unit 1, the corrugated cardboard wall panel unit 1 is guaranteed to have at least 4 complete honeycomb structures in the length direction, that is, at least four positive and negative trapezoids are symmetrically spliced ​​to form four closed hexagons.

[0079] In specific implementation, see Figure 5 (a) and (b) in Figure 8 Each sandwich corrugated cardboard 102 is folded from a flat corrugated board parallel to the corrugation direction into a symmetrical trapezoidal structure with the hypotenuse of the trapezoid making an angle of 60° with the horizontal direction. The upper and lower horizontal sides of the trapezoid are respectively bonded to the top corrugated cardboard 101 and the middle corrugated cardboard 103. The two sandwich corrugated cardboard 102 are symmetrically bonded with the middle corrugated cardboard 103 as the axis of symmetry to form a honeycomb core.

[0080] In some embodiments, the honeycomb core is filled with a flame-retardant and mildew-resistant filler.

[0081] In some embodiments, each corrugated cardboard wall panel unit 1 is coated with a waterproof coating and a decorative coating so that the resulting anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure 100 has lightweight, high strength, waterproof and moisture-proof properties.

[0082] In some embodiments, see Figure 1 , Figure 2 In (a) and (b), two corrugated cardboard wall panel units 1 forming each corrugated cardboard wall panel 100a are arranged horizontally, and two adjacent corrugated cardboard wall panel units 1 are connected by snap-fit ​​plates 2.

[0083] See Figure 9 In (a) and (b), the snap-fit ​​plate 2 includes two interlocking plates, namely a snap-fit ​​protruding plate 201 and a snap-fit ​​concave plate 202. One side of the snap-fit ​​protruding plate 201 is bonded to the outer side of one side of a corrugated cardboard wall panel unit 1, such as the sealing plate 104, and the other side faces another corrugated cardboard wall panel unit 1 and is provided with multiple protrusions 2011 along the vertical direction. One side of the snap-fit ​​concave plate 202 is bonded to the outer side of another adjacent corrugated cardboard wall panel unit 1, such as the sealing plate 104, and the other side faces the snap-fit ​​protruding plate 201. The multiple protrusions 2011 of the snap-fit ​​protruding plate 201 are provided with multiple grooves 2021 along the vertical direction, which are suitable for fitting and inserting multiple protrusions 2011 to interlock and connect two adjacent corrugated cardboard wall panel units 1.

[0084] In some embodiments, see Figure 3 , Figure 4 In (a) and (b), two corrugated cardboard wall panel units 1 forming each corrugated cardboard wall panel 100a are arranged vertically, and adjacent corrugated cardboard wall panel units 1 are connected by interlocking. See also Figure 10 , Figure 11 In (a) and (b) of the diagram, the two interlayer corrugated cardboard 102s of each corrugated cardboard wall panel unit 1 are of different lengths. One interlayer corrugated cardboard 102 is longer than the height of the corrugated cardboard wall panel unit 1, and the other interlayer corrugated cardboard 102 is shorter than the height of the corrugated cardboard wall panel unit 1. The longer interlayer corrugated cardboard 102 extends outward by a predetermined length 102a along one side of the corrugated cardboard wall panel unit 1, while the shorter interlayer corrugated cardboard 102 contracts inward by a predetermined length along one side of the corrugated cardboard wall panel unit 1, forming a contraction space 102b at the contraction position. Two adjacent corrugated cardboard wall panel units 1 are formed by inserting the extension length 102a of each interlayer corrugated cardboard into the contraction space 102b of the other, thus forming the aforementioned corrugated cardboard wall panel 100a.

[0085] Specifically, when splicing two adjacent corrugated cardboard wall panel units 1, one of the wall panels needs to be flipped upside down to ensure that the extension length 102a of both wall panels is aligned with the shrinkage space 102b of the other, so as to achieve the interlocking function.

[0086] In some embodiments, one of the interlayer corrugated cardboard 102 in each corrugated cardboard wall panel unit 1 is longer than the surface corrugated cardboard 101 and the middle corrugated cardboard 103 by 100-150 mm, and the other interlayer corrugated cardboard 102 is shorter than the surface corrugated cardboard 101 and the middle corrugated cardboard 103 by 100-150 mm, which ensures both reliable interlocking length and the rigidity of the single-layer corrugated board.

[0087] The connecting frame 100b has multiple partitioned spaces along the horizontal and vertical directions to facilitate the corresponding installation and fixing of multiple corrugated cardboard wall panels 100a, forming a complete anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure 100. In this invention, the design of the horizontal and vertical partitioned spaces forms a stable grid structure, which can effectively distribute and bear the load, thereby enhancing the overall stability and load-bearing capacity of the wall, while also providing a constraint effect on the wall panel units similar to a frame structure.

[0088] In some embodiments, the connecting frame 100b of the present invention is an aluminum alloy frame.

[0089] See Figures 1 to 4 as well as Figure 12 , Figure 13The connecting frame 100b is formed by connecting a first outer frame 101b, a second outer frame 102b, a first middle frame 103b, and a second middle frame 104b. The first outer frame 101b has two members, vertically positioned along the left and right edges of the multiple corrugated cardboard wall panels 100a. The second outer frame 102b has two members, horizontally positioned along the upper and lower edges of the multiple corrugated cardboard wall panels 100a and connected and fixed to the two first outer frames 101b. The first middle frame 103b has at least one member, vertically positioned between the two second outer frames 102b and connected and fixed to them. The second middle frame 104b has at least one member, horizontally positioned between the two first outer frames 101b and connected and fixed to them. The first outer frame 101b, the second outer frame 102b, the first middle frame 103b, and the second middle frame 104b are connected to form multiple partitioned spaces, and multiple corrugated cardboard wall panels 100a are clamped and fixed in the partitioned spaces respectively.

[0090] In practice, each second outer frame 102b is broken along the position of the first middle frame 103b. Similarly, each second middle frame 104b is broken along the position of the first middle frame 103b. Through this discontinuous design, the entire connecting frame can be considered as composed of multiple modules (rectangular frames). This modular design makes the frame more flexible in assembly and disassembly, allowing for adjustments or replacements of modules as needed without requiring large-scale modifications to the entire frame.

[0091] As is easily understood, the first middle frame 103b is positioned between two adjacent columns of corrugated cardboard wall panels 100a, and its number is determined by the number of columns of corrugated cardboard wall panels 100a arranged vertically. The corrugated cardboard wall panels 100a can be arranged in two, three, or more columns vertically, depending on the required length of the corrugated cardboard wall panel structure 100 with its overlapping symmetrical trapezoidal structure in the specific construction. Correspondingly, the first middle frame 103b can be set as one, two, or more than one column. The specific number of first middle frames 103b is not limited in this invention and is determined by specific construction requirements.

[0092] The second middle frame 104b is positioned between two adjacent rows of corrugated cardboard wall panels 100a, and its number is determined by the number of rows of corrugated cardboard wall panels 100a arranged horizontally. The corrugated cardboard wall panels 100a can be arranged in two, three, or more rows horizontally, depending on the required height of the anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure 100 during specific construction. Correspondingly, one, two, or more than one row of the second middle frame 104b can be provided. The specific number of the second middle frame 104b is not limited in this invention and is determined by specific construction requirements.

[0093] In some embodiments, see Figure 14(a) The first outer frame 101b is a groove-shaped frame with a U-shaped groove. When the first outer frame 101b is installed, its groove faces the side of the corrugated cardboard wall panel 100a so that the side of the corrugated cardboard wall panel 100a can be snapped into the groove, thereby stabilizing the corrugated cardboard wall panel 100a.

[0094] The first outer frame 101b includes a web and two flanges, which are welded to the web along one side to form the aforementioned channel-shaped frame. The length of the web of the first outer frame is the same as the length of the two flanges.

[0095] In some embodiments, see Figure 14 In (b), the first middle frame 103b is I-shaped and has two U-shaped slots. During installation, both slots of the first middle frame 103b are set facing the side of the corrugated cardboard wall panel 100a, so that the sides of the adjacent corrugated cardboard wall panels 100a can be respectively engaged in the two slots, thereby stabilizing the corrugated cardboard wall panels 100a.

[0096] The first middle frame 103b includes a web plate and two flange plates, which are welded to the web plate along the middle to form the aforementioned I-shaped frame. The length of the web plate of the first middle frame is the same as the length of the two flange plates.

[0097] In some embodiments, see Figure 14 In (c), the second outer frame 102b is a groove-shaped frame with a U-shaped groove. During installation, the groove of the second outer frame 102b faces the side of the corrugated cardboard wall panel 100a so that the side of the corrugated cardboard wall panel 100a can be snapped into the groove, thereby stabilizing the corrugated cardboard wall panel 100a.

[0098] The second outer frame 102b includes a web and two flanges. The two flanges are welded to the web along one side to form the aforementioned grooved frame. The length of the second outer frame web is greater than the length of the two flanges, and the second outer frame web extends outward along both ends of the two flanges by a certain length. This length is the same as the width of the first outer frame flange, so as to facilitate insertion into the groove of the first outer frame 101b. The gap between the two can be minimized or even eliminated, ensuring the tightness and stability of the connection.

[0099] In some embodiments, see Figure 14 In (d), the second middle frame 104b is an I-shaped frame with two U-shaped slots. During installation, both slots of the second middle frame 104b are set towards the side of the corrugated cardboard wall panel 100a, so that the sides of the adjacent corrugated cardboard wall panels 100a can be respectively engaged in the two slots, thereby stabilizing the corrugated cardboard wall panel 100a.

[0100] The second middle frame 104b includes a web plate and two flange plates. The two flange plates are welded to the web plate along the middle to form the aforementioned I-shaped frame. The length of the web plate of the second middle frame is greater than the length of the two flange plates, and the web plate of the second middle frame extends outward along both ends of the two flange plates by a certain length. This length is the same as the width of the flange plates of the first outer frame, so as to facilitate insertion into the slots of the first outer frame. The gap between the two can be minimized or even eliminated, ensuring the tightness and stability of the connection.

[0101] In some embodiments, see continue to see Figure 12 , Figure 13 The first outer frame 101b, the second outer frame 102b, the first middle frame 103b, and the second middle frame 104b are connected and fixed by connecting plates 3. Connecting plates 3 include connecting plate one 301, connecting plate two 302, connecting plate three 303, and connecting plate four 304. Connecting plate one 301 connects the first outer frame 101b and the second outer frame 102b; connecting plate two 302 connects the second middle frame 104b to the first outer frame 101b; connecting plate three 303 connects the first middle frame 103b to the second outer frame 102b; and connecting plate four 304 connects the first middle frame 103b to the second middle frame 104b.

[0102] The connecting plate 301 includes two symmetrically arranged rectangular plates 3011. One end of each rectangular plate 3011 covers the end surface of the first outer frame 101b, and the other end covers the end surface of the second outer frame 102b. The two rectangular plates 3011 clamp the first outer frame 101b and the second outer frame 102b from front to back, and are connected and fixed to the first outer frame 101b, the second outer frame 102b and the corrugated cardboard wall panel 100a by riveting or using a continuous bolt.

[0103] The connecting plate 302 includes two symmetrically arranged rectangular plates 3021. One end of each rectangular plate 3021 covers the end surface of the second middle frame 104b, and the other end covers the middle surface of the first outer frame 101b. The two rectangular plates 3021 clamp the second middle frame 104b and the first outer frame 101b from front to back, and are connected and fixed to the second middle frame 104b, the first outer frame 101b, and the corrugated cardboard wall panel 100a by riveting or using a continuous bolt.

[0104] The connecting plate 303 includes two symmetrically arranged rectangular plates 3031. One end of each rectangular plate 3031 covers the end surface of the first middle frame 103b, and the other end covers the middle surface of the second outer frame 102b. The two rectangular plates 3031 clamp the first middle frame 103b and the second outer frame 102b from front to back, and are connected and fixed to the first middle frame 103b, the second outer frame 102b and the corrugated cardboard wall panel 100a by riveting or through bolts.

[0105] The connecting plate 4 304 includes two symmetrically arranged rectangular plates 4 3041. One end of each rectangular plate 4 3041 covers the middle surface of the first middle frame 103b, and the other end covers the end surface of the second middle frame 104b. The two rectangular plates 4 3041 clamp the first middle frame 103b and the second middle frame 104b and are connected and fixed to the first middle frame 103b, the second middle frame 104b and the corrugated cardboard wall panel 100a by riveting or through bolts.

[0106] In some embodiments, see continue to see Figure 1 , 3 16, 17. The anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure 100 proposed in this invention also includes multiple vertical reinforcing ribs 4. These vertical reinforcing ribs 4 are vertically arranged within the corrugations of the corrugated cardboard wall panel unit 1 and are vertically spaced along the length of the unit 1. Each vertical reinforcing rib 4 vertically penetrates one row of corrugated cardboard wall panels 100a, i.e., at least two panels 100a, and its two ends are connected and fixed to the connecting frame 100b. Since emergency buildings and temporary structures primarily bear vertical loads in most cases, the vertical reinforcing ribs 4, as vertical stiffeners, mainly serve to strengthen vertical connections and enhance the overall structure's integrity and stability. It should be noted that the number of vertical reinforcing ribs 4 shown in the figure is only schematic; the specific spacing and number of ribs are determined by the design based on the wall panel's length and load-bearing requirements.

[0107] Each vertical reinforcing rib 4 is, for example, placed within a channel formed by the symmetrical trapezoidal splicing of two sandwich corrugated cardboard sheets 102. Because the vertical reinforcing rib 4 is embedded within the vertical channel, it does not disrupt the flatness of the wall panel surface. This means that the wall panel can maintain its original flatness and smoothness during installation and use, without the need for additional decoration or treatment to conceal the presence of the vertical reinforcing rib 4, thus preserving the wall's aesthetics and texture.

[0108] Furthermore, the vertical reinforcing rib 4 is placed in the channel formed by the symmetrical trapezoidal splicing of two sandwich corrugated cardboard 102, and polyester foam is further filled in the channel to serve as the vertical stiffening rib of the wall panel.

[0109] In one specific embodiment, see Figure 15 In (a) and (b), the two second outer frames 102b and the second middle frame 104b of the connecting frame 2 each have multiple holes 5 pre-drilled for the multiple vertical reinforcing ribs 4, so as to facilitate the installation of the multiple vertical reinforcing ribs 4. The two ends of the multiple vertical reinforcing ribs 4 are welded with screws, and the two ends of the multiple vertical reinforcing ribs 4 pass through the holes 5 of the two second outer frames 102b and are fixed by nuts passing through the screws.

[0110] See Figures 16 to 19The present invention also proposes a prefabricated wall structure system, which includes the aforementioned anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure 100 and corrugated cardboard columns 200. Two corrugated cardboard columns 200 are provided, symmetrically arranged on the left and right sides of the anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure 100, and connected and fixed to the anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure 100 via connecting components 300.

[0111] The prefabricated wall structure system of this invention adopts a dry construction method, eliminating the need for wet work such as plastering and mortar leveling on site. It simply requires connecting the columns and wall structure using connecting components, significantly shortening the construction cycle. It is also suitable for the construction of emergency buildings and temporary structures using cardboard structures, enabling both factory prefabrication and rapid on-site fabrication.

[0112] See also Figure 19 The connecting component 300 includes a connecting square tube 300a and an L-shaped connecting plate 300b. Multiple connecting square tubes 300a are provided, and the multiple connecting square tubes 300a are at least sleeved on the top, bottom and middle of the corrugated cardboard column 200. One side of each connecting square tube 300a abuts against the connecting frame 100b of the corrugated cardboard wall panel structure 100 with opposite overlapping symmetrical trapezoidal structure. The L-shaped connecting plates 300b are symmetrically arranged on both sides of each connecting square tube 300a abutting against the connecting frame 100b. One side of the two L-shaped connecting plates 300b is connected to the connecting square tube 300a by riveting, and the other side is connected to the connecting frame 100b by riveting.

[0113] As is easily understood, riveting refers to the use of specialized riveting tools (such as a rivet gun) to apply force, causing plastic deformation in specific parts of the rivet, thereby forming a tight and strong connection between the joined components. During the riveting process, the shoulder of the rivet is subjected to tensile force while simultaneously exerting pressure on both the rivet and the base material. This pressure causes localized plastic deformation in both the rivet and the base material, thus achieving a tight connection between them.

[0114] Riveting is a relatively simple operation that does not require complex equipment or processes. Simply select the appropriate rivets and riveting tools, and follow the correct steps.

[0115] In one specific embodiment, the connecting square tube 300a is correspondingly disposed at the end positions of the second outer frame 102b and the second middle frame 102b of the connecting frame 100b, ensuring that the connecting square tube 300a is connected to the upper, middle and lower parts of the wall frame 100b.

[0116] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used in this invention is chosen to best explain the principles, practical applications, or technological improvements to the embodiments in the market, or to enable others skilled in the art to understand the disclosed embodiments.

[0117] While several specific implementation details are included in the foregoing discussion, these should not be construed as limiting the scope of the invention. Certain features described in the context of individual embodiments may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented individually or in any suitable sub-combination in multiple implementations.

Claims

1. A prefabricated wall structure system based on anisotropic overlapping symmetrical trapezoidal corrugated cardboard wall panel structure, characterized in that, The corrugated cardboard wall panel structure with an anti-directional overlapping symmetrical trapezoidal structure has corrugated cardboard columns at both ends, and the corrugated cardboard wall panel structure with the anti-directional overlapping symmetrical trapezoidal structure is connected and fixed to the corrugated cardboard columns by connecting components; the anti-directional overlapping symmetrical trapezoidal structure includes: Multiple corrugated cardboard wall panels are arranged horizontally and vertically. Each corrugated cardboard wall panel is composed of at least two corrugated cardboard wall panel units connected together. Each corrugated cardboard wall panel unit includes: Two pieces of corrugated cardboard are placed opposite each other with a gap between them. Each piece of corrugated cardboard has at least one corrugated layer. The corrugation direction of the corrugated layer is perpendicular to the height direction of the corrugated cardboard wall panel unit. Two sandwich corrugated cardboard sheets are disposed between the two surface corrugated cardboard sheets. Each sandwich corrugated cardboard sheet has at least one corrugated layer, and the corrugation direction of the corrugated layer is parallel to the height direction of the corrugated cardboard wall panel unit. Each sandwich corrugated cardboard sheet is bent into a wave shape with several positive and negative trapezoids connected together along the length direction of the corrugated cardboard wall panel unit, and the several positive and negative trapezoids of the two sandwich corrugated cardboard sheets are mirror symmetrical. A middle corrugated cardboard is disposed between two sandwich corrugated cardboard sheets. The middle corrugated cardboard sheet has at least one corrugated layer. The corrugation direction of the corrugated layer is perpendicular to the height direction of the corrugated cardboard wall panel unit, and the two sandwich corrugated cardboard sheets are mirror-symmetrical on both sides of the middle corrugated cardboard sheet. The connecting frame has multiple partition spaces along the horizontal and vertical directions for correspondingly installing and fixing multiple corrugated cardboard wall panels to form an anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure. Multiple vertical reinforcing ribs are vertically spaced within the corrugations of the corrugated cardboard wall panel unit. The corrugations are filled with polyester foam, and each reinforcing rib vertically penetrates at least two corrugated cardboard wall panels, with both ends connected and fixed to the connecting frame. The connection component includes: Connecting square tubes, a plurality of the connecting square tubes being fitted at least at the top, bottom and middle of the corrugated cardboard column, and one side of each of the connecting square tubes abutting against the connecting frame of the anti-directional overlapping symmetrical trapezoidal corrugated cardboard wall panel structure; L-shaped connecting plates are symmetrically arranged on both sides of each connecting square tube that abuts against the connecting frame. One side of each L-shaped connecting plate is riveted to the connecting square tube, and the other side is riveted to the connecting frame.

2. The prefabricated wall structure system according to claim 1, characterized in that, Each corrugated cardboard wall panel unit also includes two sealing plates, each of which is disposed on both sides of the corrugated cardboard wall panel unit and is bonded to the surfaces of the two surface corrugated cardboard sheets.

3. The prefabricated wall structure system according to claim 1, characterized in that, The connecting frame is composed of a first outer frame, a second outer frame, a first middle frame, and a second middle frame connected together. Two sets of the first outer frames are vertically arranged on the left and right edges of the multiple corrugated cardboard wall panels, and two sets of the second outer frames are horizontally arranged on the upper and lower edges of the multiple corrugated cardboard wall panels and connected to the two sets of the first outer frames. At least one set of the first middle frames is vertically connected between the two sets of the second outer frames, and at least one set of the second middle frames is horizontally connected between the two sets of the first outer frames. The first outer frame, the second outer frame, the first middle frame, and the second middle frame are connected to form multiple partition spaces, and the multiple corrugated cardboard wall panels are respectively clamped and fixed in the partition spaces.

4. The prefabricated wall structure system according to claim 3, characterized in that, The first outer frame is a slotted frame, and its slot faces the corrugated cardboard wall panel; and / or, the second outer frame is a slotted frame, and its slot faces the corrugated cardboard wall panel; and / or, the first middle frame is an I-shaped frame, and its slot faces the corrugated cardboard wall panel; and / or, the second middle frame is an I-shaped frame, and its slot faces the corrugated cardboard wall panel.

5. The prefabricated wall structure system according to claim 3, characterized in that, The first outer frame, the second outer frame, the first middle frame, and the second middle frame are connected and fixed by connecting plates. The connecting plates include connecting plate one, connecting plate two, connecting plate three, and connecting plate four. The connecting plate one is used to connect the first outer frame and the second outer frame, the connecting plate two is used to connect the second middle frame and the first outer frame, the connecting plate three is used to connect the first middle frame and the second outer frame, and the connecting plate four is used to connect the first middle frame and the second middle frame.

6. The prefabricated wall structure system according to claim 1, characterized in that, Two corrugated cardboard wall panel units that form each corrugated cardboard wall panel are connected by interlocking in the horizontal direction. One of the corrugated cardboard wall panel units has an interlocking protrusion glued to its vertical edge, and the other corrugated cardboard wall panel unit has an interlocking concave plate glued to its vertical edge. The interlocking protrusion and the interlocking concave plate are adapted to be inserted and interlocked.

7. The prefabricated wall structure system according to claim 1, characterized in that, Two corrugated cardboard wall panel units forming each corrugated cardboard wall panel are vertically interlocked. In each corrugated cardboard wall panel unit, one of the interlayer corrugated cardboard extends outward by a predetermined length along one side of the corrugated cardboard wall panel unit, while the other interlayer corrugated cardboard contracts inward by a predetermined length along one side of the corrugated cardboard wall panel unit to form a contraction space. The two corrugated cardboard wall panel units are connected by inserting the extended length of one interlayer corrugated cardboard into the contraction space of the other interlayer corrugated cardboard.

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