Wall structure

Abstract

To provide a wall structure capable of improving heat insulation performance and sound insulation performance.SOLUTION: A wall structure is constituted by assembling a plurality of double wall members 10 having 2 plate members 11 having at least 3 layers of a porous body layer formed of a porous body, a fiber layer reinforcing the porous body layer, and a skin layer forming a surface, and a plurality of elongated joint members 12 interposed between the 2 plate members 11 and integrating the 2 plate members 11 with a predetermined interval.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to wall structures. [Background technology]

[0002] Conventionally, commercially available disaster prevention tents and partitions have been made of vinyl, cloth, cardboard, etc. (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 58-69503 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-89396 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the products described in Patent Documents 1 and 2 do not have high thermal insulation or soundproofing performance. For this reason, there is a demand for higher performance products in environments where at least one of relatively high thermal insulation or soundproofing performance is required, such as when used outdoors as a tent, in an evacuation shelter where the use of heating is restricted, or when used as a partition in a workplace.

[0005] The present disclosure has been made to solve such conventional problems, and its purpose is to provide a wall structure that can improve thermal insulation performance and sound insulation performance. [Means for solving the problem]

[0006] In order to solve this problem, the wall structure of the present disclosure is constructed by assembling multiple double-wall materials, each of which has two plates having at least three layers: a porous body layer formed by a porous body, a fiber layer reinforcing the porous body layer, and a skin layer forming the surface; and multiple joint members that are elongated in the spacing direction and are interposed between the two plates to unite the two plates with a predetermined spacing between them. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a wall structure that can improve heat insulation performance and sound insulation performance. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a wall structure according to this embodiment. [Figure 2] FIG. 2 is a perspective view showing details of the double-walled material shown in FIG. [Figure 3] FIG. 3 is a cross-sectional view of each of the two plates shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view showing another example of each of the two plate materials shown in FIG. [Figure 5] FIG. 5 is a plan view of each of the two plate materials shown in FIG. [Figure 6] FIG. 6 is a perspective view showing details of the joint member shown in FIG. [Figure 7] FIG. 7 is a perspective view showing the details of the clip shown in FIG. [Figure 8] FIG. 8 is a configuration diagram showing the details of the clip shown in FIG. 2, and is a side view showing the inserted state of the clip. [Figure 9] FIG. 9 is a structural diagram showing details of the clip shown in FIG. 2, and is a top view. [Figure 10] FIG. 10 is a first perspective view showing the state in which the double-wall materials shown in FIG. 2 are assembled together. [Figure 11]FIG. 11 is a second perspective view showing the assembled state of the double-wall materials shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present disclosure will be described below in accordance with preferred embodiments. Note that the present disclosure is not limited to the embodiments described below and can be modified as appropriate without departing from the spirit of the present disclosure. In addition, in the embodiments described below, some configurations are omitted from illustration and description, but it goes without saying that publicly known or well-known technologies are applied as appropriate to the details of the omitted technologies within the scope of the content described below.

[0010] Fig. 1 is a perspective view showing a wall structure according to this embodiment. The wall structure 1 shown in Fig. 1 has improved thermal insulation and sound insulation performance, and is formed by assembling a plurality of double wall materials 10. Such a wall structure 1 is configured to include a plurality of double wall materials 10 and a hidden panel 20.

[0011] Figure 2 is a perspective view showing details of the double-walled material 10 shown in Figure 1. As shown in Figure 2, the double-walled material 10 is configured to include two plate materials 11, a plurality of joint members 12, and clips (first to fourth insertion members) 13. The two plate materials 11 are rectangular in plan view.

[0012] Fig. 3 is a cross-sectional view of each of the two plate materials 11 shown in Fig. 2. The two plate materials 11 shown in Fig. 3 have at least three layers: a porous material layer 11a formed of a porous material, fiber layers 11b and 11c that reinforce the porous material layer 11a, and a skin layer 11d that forms the surface.

[0013] The porous layer 11a is made of a foam material such as semi-rigid urethane foam. The fiber layers 11b and 11c are arranged to sandwich the porous layer 11a and reinforce the porous layer 11a to maintain its shape. The fiber layers 11b and 11c are made of a fiber material such as glass mat. In this embodiment, the fiber layers 11b and 11c are provided on both sides of the porous layer 11a, but this is not limiting and the fiber layers 11b and 11c may be provided on only one side, for example.

[0014] The skin layer 11d is the outermost surface of the board 11 and is provided on the first fiber layer 11b. The skin layer 11d is made of a breathable material selected from nonwoven fabric, woven fabric, knitted fabric, etc., and is positioned on the outer surface of the two boards 11 to function as a design surface.

[0015] Such a plate material 11 has the porous layer 11a, and therefore the numerous air layers present in the porous layer 11a improve the heat insulating performance and sound insulating performance.

[0016] Furthermore, the two plates 11 may each have a back layer 11e as shown in FIG. 3. The back layer 11e is provided on the second fiber layer 11c. The back layer 11e is made of a non-breathable material, such as a film material or a metal-deposited film. Therefore, even if the porous layer 11a, the fiber layers 11b and 11c, and the skin layer 11d are all breathable, the back layer 11e can stop the flow of air. This traps air between the two plates 11, contributing to improved thermal insulation.

[0017] Fig. 4 is a cross-sectional view showing another example of each of the two plate materials 11 shown in Fig. 2. The two plate materials 11 are not limited to those shown in Fig. 3, and may be, for example, those shown in Fig. 4. The two plate materials 11 shown in Fig. 4 are common to those shown in Fig. 3 in that they each include at least three layers: a porous layer 11a, fiber layers 11b and 11c, and a skin layer 11d.

[0018] Furthermore, the two plates 11 shown in FIG. 4 each include an infrared reflective layer 11f and a protective layer 11g. The infrared reflective layer 11f is provided on the second fiber layer 11c. The infrared reflective layer 11f is a vapor-deposited film formed by, for example, forming a vapor-deposited layer of metal (e.g., aluminum) on the surface of a base film. The infrared reflective layer 11f preferably has a total thickness including the base film and the vapor-deposited layer of, for example, 0.03 μm to 0.09 μm. Such an infrared reflective layer 11f can achieve an infrared reflection efficiency of approximately 80% to 95%, further improving heat insulation performance. In addition to reflecting infrared rays, the infrared reflective layer 11f thus configured also has an impermeability function.

[0019] The protective layer 11g is made of a transparent resin material and is provided on the infrared reflective layer 11f. The protective layer 11g is laminated so as to cover the surface of the vapor deposition layer of the infrared reflective layer 11f.

[0020] Referring again to Figure 2, the multiple joint members 12 are members for integrating two plate materials 11 with a predetermined gap between them. The joint members 12 are elongated in the spacing direction between the two plate materials 11, and clips 13 that penetrate the plate materials 11 are attached to both ends of the elongated shape, integrating the two plate materials 11.

[0021] At least one such joint member 12 is provided on each side of the two rectangular plate materials 11. In this embodiment, one joint member 12 is provided at each corner of the rectangle, with two joint members 12 arranged on each side. Therefore, the double-wall material 10 is formed by connecting two plate materials 11 at the corners with the joint members 12. It is preferable that the joint members 12 are long enough to allow the double-wall material 10 to stand on its own after it has been fabricated.

[0022] FIG. 5 is a plan view of each of the two plate materials 11 shown in FIG. 2. In FIG. 5, the up-down direction is the same as the vertical direction in which the double-wall material 10 shown in FIG. 1 is stacked vertically, and the width direction is the direction perpendicular to both the up-down direction and the spacing direction shown in FIG. 2. As shown in FIG. 5, the two plate materials 11 have through holes 11h formed at the corners corresponding to the joint members 12 provided at the corners. Furthermore, the two plate materials 11 have second through holes (through holes) 11i formed at positions adjacent to the center of the through holes 11h in the width direction. The second through holes 11i are filled with materials having the same layer structure as the two plate materials 11. In this embodiment, the second through holes 11i are assumed to be aligned vertically with the through holes 11h without any vertical misalignment. However, this is not limiting, and the second through hole 11i may have a slight vertical offset relative to the through hole 11h (specifically, an offset within the range of the width of the first plate portion 12a and the second plate portion 12b described later).

[0023] Such through holes 11h are formed by hollowing out spaces corresponding to the through holes 11h from the two plate materials 11. On the other hand, the second through holes 11i can be formed by inserting a cylindrical or C-shaped blade into the two plate materials 11 to make circular or approximately circular cuts without hollowing out the two plate materials 11.

[0024] Fig. 6 is a perspective view showing details of the joint member 12 shown in Fig. 2. As shown in Fig. 6, the joint member 12 is configured to include a first plate portion 12a, a second plate portion 12b, a first end wall 12c, and a second end wall 12d.

[0025] The first plate portion 12a and the second plate portion 12b are substantially rectangular plate portions that are elongated in the spacing direction (longitudinal direction of the elongated shape) of the two plate materials 11. The first plate portion 12a and the second plate portion 12b are connected at their sides at a 90° angle to form an L-shaped plate portion 12e that has a substantially L-shaped cross section. The first end wall 12c and the second end wall 12d are walls formed at both ends of the L-shaped plate portion 12e in the spacing direction.

[0026] The first plate portion 12a and the second plate portion 12b each have plate openings 12f and 12g, which include openings. The first end wall 12c and the second end wall 12d each have wall openings 12h and 12i, which include openings. The openings 12f to 12i are provided approximately in the center of each of the portions 12a to 12d. The wall openings 12h and 12i formed in the first end wall 12c and the second end wall 12d are configured to communicate with the through hole 11h when the joint member 12 is placed at the corner of the two plate members 11. Therefore, by inserting clips 13 into the communicating wall openings 12h and 12i and the through hole 11h, the two plate members 11 can be integrated via the joint member 12.

[0027] In particular, the wall openings 12h, 12i formed in the first end wall 12c and the second end wall 12d are coaxially aligned along the spacing direction. Therefore, after the two plates 11 are joined together, the joint member 12 can be rotated around the axis in the spacing direction, as shown by the arrow in Figure 6. This allows the joint member 12 to be oriented appropriately for connection to other joint members 12, or to be oriented in a way that makes it easier to insert the clip 13 during connection, as will be described later.

[0028] Furthermore, the plate openings 12f, 12g formed in the first plate portion 12a and the second plate portion 12b are used to connect the joint members 12 together and to assemble the double-walled material 10 at corners, as described below. In particular, when assembling the double-walled material 10 at corners, the plate openings 12f, 12g formed in the first plate portion 12a and the second plate portion 12b are brought into communication with the second through hole 11i. That is, the material with the same layer structure that was filled in the second through hole 11i is peeled off, and the exposed second through hole 11i and the plate openings 12f, 12g are brought into communication with each other.

[0029] 7 to 9 are configuration diagrams showing details of clip 13 shown in Fig. 2, with Fig. 7 being a perspective view, Fig. 8 being a side view showing the inserted state of clip 13, and Fig. 9 being a top view. Clip 13 shown in Fig. 7 is used to attach two plate materials 11 to joint member 12 as described above, and includes base portion 13a, shaft portion 13c, operating portion 13d, and umbrella portion 13e.

[0030] As shown in Fig. 8, base 13a is a portion that comes into contact with two plate materials 11 when clip 13 is attached to two plate materials 11, and is shaped like a roughly circular plate. Shaft 13c is a member that extends perpendicular to base 13a, which is shaped like a roughly circular plate. Shaft 13c passes through hole 13b formed in the center of base 13a, as shown in Fig. 7. Operating portion 13d is a circular plate provided at the base end of shaft 13c. Umbrella portion 13e is a member that is provided on the tip side of base 13a and covers part of the side of shaft 13c.

[0031] Here, as shown in Fig. 8, the shaft portion 13c has an expanded diameter portion 13f that is expanded laterally toward the tip end. Therefore, as shown in Fig. 8, when the operating portion 13d is pushed toward the tip end, the umbrella portion 13e elastically deforms laterally. Furthermore, the operating portion 13d is configured to maintain this state in the pushed-in state, and the umbrella portion 13e maintains its elastically deformed state laterally. Furthermore, when elastically deformed laterally, the umbrella portion 13e protrudes laterally beyond the diameter of the through-holes 11h and 11i. Therefore, the clip 13 is prevented from coming off by the umbrella portion 13e.

[0032] In addition, such a clip 13 can be released from the retained state by applying excessive force to move the operating portion 13d toward the base. Here, as shown in FIG. 9, the base portion 13a has grooves 13g formed at intervals of approximately 120°. Also, when the clip 13 is viewed from the side as shown in FIG. 8, the tip side surface 13h of the operating portion 13d can be seen through the grooves 13g. Therefore, for example, by using a flat-head screwdriver or the like to gouge the gap between the tip side surface 13h and the groove portion 13g, the retained state can be released.

[0033] The double-walled material 10 according to this embodiment is made up of the two plate materials 11, the joint member 12, and the clip 13 described above, and therefore can be more easily fabricated. That is, the worker first places the joint member 12 at the corner of the two plate materials 11. Next, the worker connects the wall openings 12h, 12i formed in the first end wall 12c and the second end wall 12d with the through holes 11h of the two plate materials 11. After that, the worker presses the clip 13 into the connecting portion. By performing this process at all four corners, the double-walled material 10 shown in FIG. 2 can be fabricated.

[0034] Figure 10 is a first perspective view showing the assembled state of the double-wall materials 10 shown in Figure 2. Note that in Figure 10, some components are shown with dashed lines for ease of viewing.

[0035] As described above, the joint members 12 are disposed at the corners of the two plate materials 11. Therefore, when the double-walled materials 10 are stacked one above the other as shown in Fig. 10, the joint members 12 come into contact with or are close to each other. Note that although the double-walled materials 10 are stacked one above the other in Fig. 10, the joint members 12 also come into contact with or are close to each other when they are arranged side by side.

[0036] In this state, an operator can rotate both joint members 12 in the appropriate direction to bring the plate openings 12f, 12g of the L-shaped plate portion 12e into a communicating state. Therefore, by inserting clips 13 into the communicating portions, the joint members 12 are connected to each other as shown in Figure 10. The clips 13 also connect all other contacting or adjacent joint members 12 to each other as described above. As a result, the double-wall materials 10 are assembled together as shown in Figure 10.

[0037] Figure 11 is a second perspective view showing the assembled state of the double-wall materials 10 shown in Figure 2. As with Figure 10, some components in Figure 11 are shown with dashed lines for ease of viewing.

[0038] The double-wall material 10 is assembled at the corner of the wall structure 1 using plate openings 12f, 12g formed in the first plate portion 12a and the second plate portion 12b. In this case, as shown in FIG. 11, one double-wall material 10a is positioned at a right angle to the other double-wall material 10b. Furthermore, one plate 11 of one double-wall material 10a has the same layer structure material filled in the second through hole 11i removed. Furthermore, the exposed second through hole 11i and the plate openings 12f, 12g are in communication with each other. Therefore, by inserting a clip 13 into the communication portion, the double-wall materials 10 are assembled together at the corner as shown in FIG. 11.

[0039] Referring again to Figure 1, the hidden plate 20 is a plate placed so as to close the gap formed by the two plates 11 of the double wall material 10. Holes are also formed in appropriate locations on this hidden plate 20. The holes in the hidden plate 20 are formed so as to communicate with plate openings 12f, 12g formed in the first plate portion 12a and the second plate portion 12b of the joint member 12 that constitutes the double wall material 10. For this reason, the hidden plate 20 can also be attached using clips 13.

[0040] 1, the concealing plate 20 is provided so as to cover only the side portions of the gap between the two plate materials 11 (see FIG. 2), and is not provided in the upper portion of the gap. However, this is not limiting, and the concealing plate 20 may be provided to cover the upper portion.

[0041] Next, a method for producing the wall structure 1 according to this embodiment will be described. To produce the wall structure 1, first, the required number of double wall materials 10 are produced. To produce one double wall material 10, a worker first prepares two plate materials 11, four joint members 12, and eight clips 13.

[0042] Next, the worker places the protective layers 11g of the two plate materials 11 facing each other and places the joint member 12 between the two plate materials 11. At this time, the worker places the joint member 12 at the corner of the two plate materials 11. This connects the wall openings 12h, 12i of the joint member 12 with the through holes 11h of the two plate materials 11. The worker then pushes the clip 13 into the connecting portion. This keeps the clip 13 in a prevented state unless it is dug with a flathead screwdriver or the like. The worker then performs the same operation on the other corners of the two plate materials 11. This completes the double-walled material 10. The worker then creates the required number of double-walled materials 10.

[0043] Next, the worker assembles the double-wall materials 10 together. First, when assembling the double-wall materials 10 that constitute parts other than the corners, the worker stacks the double-wall materials 10 vertically or side-by-side. If the orientation of the joint member 12 is incorrect, the worker rotates the joint member 12 to adjust the orientation so that the plate portions 12a and 12b of the L-shaped plate portion 12e face each other. In this facing state, the plate openings 12f and 12g formed in the L-shaped plate portion 12e communicate with each other. The worker then pushes the clip 13 into the communicating portion. The worker then performs the same operation on all of the joint members 12 to be connected. This completes the assembly of the double-wall materials 10. The worker then connects the double-wall materials 10 vertically to the required height and laterally to the required length.

[0044] Furthermore, the worker assembles the double-wall materials 10 together at the corners. At this time, the worker removes the material with the same layer structure that was embedded in the second through hole 11i of one of the plates 11 of one of the double-wall materials 10a. The worker then connects the second through hole 11i to the wall openings 12h, 12i of the joint member 12. Next, the worker pushes a clip 13 into the connected portion. At this time, for example, the worker pushes the clip 13 from the protective layer 11g side of one of the plates 11 of one of the double-wall materials 10a. At other locations where similar work is to be performed, the material with the same layer structure that was embedded in the second through hole 11i is removed, and clips 13 are pushed into the connected portion.

[0045] As described above, the double wall materials 10 are assembled to create the wall structure 1. As described above, the joint members 12 used in the wall structure 1 are the same shape (i.e., one type) in all of the following steps: creating the double wall material 10, assembling the top and bottom of the double wall material 10, assembling the sides of the double wall material 10, and assembling the corners of the double wall material 10. The clips 13 are also the same shape (i.e., one type) in all of the above steps. Therefore, the wall structure 1 according to this embodiment is different from assembling a typical tent, where multiple types of parts are appropriately assembled while referring to an instruction manual. In other words, the number of different parts is kept to a minimum, simplifying the construction of the wall structure 1.

[0046] Thus, according to the wall structure 1 of this embodiment, the two plate materials 11 each include a porous layer 11a, and therefore at least the plate materials 11 themselves have relatively high thermal insulation and sound insulation performance. Furthermore, the two plate materials 11 are joined together at a predetermined distance by the elongated joint member 12, forming a double-wall structure, which can further enhance thermal insulation and sound insulation by utilizing the air layer between them. By assembling and configuring double-wall materials 10 having such functions, a wall structure 1 can be provided that can improve thermal insulation and sound insulation performance.

[0047] Furthermore, since the two plate materials 11 are rectangular and at least one joint member 12 is provided on each side of the rectangle, the joint members 12 are provided so as to easily maintain a predetermined distance on each side, making it easier to stabilize the shape of the double-wall material 10.

[0048] Furthermore, since the joint members 12 of adjacent double wall materials 10 are connected to each other, the double wall materials 10 can be assembled together using members for maintaining a predetermined distance, making it easier to stabilize the shape of the wall structure 1 as a whole.

[0049] The joint member 12 also has a first end wall 12c and a second end wall 12d, each of which has a wall opening 12h, 12i formed therein. Therefore, by inserting clips 13 that penetrate the two plate materials 11 into the wall openings 12h, 12i of the first end wall 12c and the second end wall 12d, the two plate materials 11 can be integrated by the insertion process. The joint member 12 has a first plate portion 12a and a second plate portion 12b, each of which has a plate opening 12f, 12g formed therein. Therefore, by connecting the plate openings 12f, 12g of the joint members 12 of adjacent double-wall materials 10 and inserting clips 13, the adjacent double-wall materials 10 can be assembled by the insertion process.

[0050] Furthermore, the wall openings 12h, 12i formed in the first end wall 12c and the second end wall 12d are formed coaxially, so that the joint member 12 can rotate around the clip 13 when the two plate materials 11 are integrated together. This makes it possible to rotate the L-shaped plate portion 12e in an appropriate direction to connect the plates or to facilitate the insertion of the clip 13.

[0051] Furthermore, the joint members 12 used to connect adjacent double wall materials 10 vertically and laterally can also be used to connect them at corners, allowing for the use of standardized parts.

[0052] Furthermore, the two plate materials 11 are formed with through holes 11h for inserting clips 13 therethrough, so that the through holes 11h can be used as landmarks for assembling when the two plate materials 11 are integrated using the joint member 12. Furthermore, the second through holes 11i used when assembling the corner portions are filled with a material having the same layer structure, so that the filled material can be removed when necessary to make it easier to insert clips 13 while preventing deterioration in appearance.

[0053] The present invention has been described above based on the embodiments, but the present invention is not limited to the above embodiments, and modifications may be made within the scope of the spirit of the present invention, and if possible, publicly known or well-known technologies may be combined.

[0054] For example, in the above embodiment, one common type of clip 13 is used, but this is not limited thereto, and different types may be used for each insertion location. Furthermore, if the tip of the clip 13 is very sharp, the through-holes 11h and 11i may not be formed in the plate material 11. Furthermore, in the above embodiment, the clip 13 is described as a two-piece type in which the operating portion 13d is movable relative to the base portion 13a, but this is not limited thereto, and the clip may be a one-piece type, for example. Furthermore, even if it is a two-piece type, it may have a different shape from the shapes shown in FIGS. 7 to 9, for example, a different neck shape. In addition, the two plate materials 11 are not limited to being integrated by the clip 13, but may be integrated using screws, bolts, nuts, etc.

[0055] Although the joint members 12 are arranged at the corners of the two plates 11, they may be arranged at different positions, such as the center of each side, without being limited to the corners. Furthermore, the first plate portion 12a and the second plate portion 12b each have one plate opening 12f, 12g, but the number is not limited to one and they may have two or more. The same applies to the wall openings 12h, 12i.

[0056] Furthermore, in this embodiment, the plate material 11 may be a recycled product. For example, porous urethane is used in a variety of products. Therefore, the porous urethane that would become the porous layer 11a of a discarded product may be newly laminated with fiber layers 11b and 11c and a skin layer 11d to form the plate material 11. Furthermore, if the recycled product itself has at least a three-layer structure consisting of the porous layer 11a, the fiber layers 11b and 11c, and the skin layer 11d, it may be used as the plate material 11 as is. For example, if a vehicle ceiling material has this layer structure, when a sunroof opening is formed, the portion corresponding to the sunroof opening becomes waste material as is. Therefore, the waste material may be used as the plate material 11 as is, or may be cut to the required size.

[0057] In the above embodiment, it is assumed that the two plates 11 are made of the same material, but this is not a limitation, and the two plates 11 may be made of different materials. For example, one of the two plates 11 may have a four-layer structure including a porous layer 11a, two fiber layers 11b and 11c, and a skin layer 11d, while the other of the two plates 11 may have a six-layer structure further including an infrared reflective layer 11f and a protective layer 11g. [Explanation of symbols]

[0058] 1: Wall structure 10, 10a, 10b: Double wall material 11: Board material 11a: Porous layer 11b, 11c: fiber layer 11d: Epidermal layer 11h: Through hole 11i: 2nd through hole (through hole) 12: Joint material 12a: 1st plate part 12b: 2nd plate part 12c: 1st end wall 12d: Second end wall 12e:L-shaped plate part 12f,12g: Plate opening 12h,12i: Wall opening 13: Clip (first to fourth insertion members)

Claims

1. The double-walled material is constructed by assembling a plurality of double-walled materials, each of which has two plates each having at least three layers: a porous body layer formed by a porous body, a fiber layer reinforcing the porous body layer, and a skin layer forming the surface; and a plurality of joint members each having an elongated shape in the spacing direction, which are interposed between the two plates and unite the two plates with a predetermined spacing between them. A wall structure characterized by:

2. The double-walled material has two rectangular plate members, and at least one joint member is provided on each side of the rectangle.

2. The wall structure of claim 1.

3. When a plurality of double-walled materials are assembled, the joint members of the adjacent double-walled materials are in contact with or in close proximity to each other, and the joint members of both double-walled materials are connected to each other.

3. The wall structure according to claim 2.

4. The joint member has an L-shaped plate portion interposed between rectangular corners of the two plate materials, and having an L-shaped cross section formed by connecting side portions of a first plate portion and a second plate portion that are elongated in the spacing direction, and a first end wall and a second end wall formed at both ends of the L-shaped plate portion in the spacing direction, the first plate portion and the second plate portion each have a plate aperture portion including an aperture, the first end wall and the second end wall each have a wall aperture portion including an aperture; the first end wall is integrated with one of the two plate materials by inserting a first insertion member that penetrates the one of the two plate materials into a wall opening portion; the second end wall is integrated with the other plate member by inserting a second insertion member, which penetrates the other plate member, into the wall opening; The two joint members to be connected are connected by inserting the third insertion member into the plate openings of the two joint members so that the plate openings are in communication with each other.

4. The wall structure according to claim 3.

5. The wall openings formed in the first end wall and the second end wall are formed one each on the same axis along the spacing direction.

5. The wall structure according to claim 4.

6. The two double-walled members that form a corner portion when assembled are assembled by a fourth insertion member penetrating one plate member of one of the double-walled members and inserting the fourth insertion member into the plate opening portion of the first plate portion or the second plate portion of the other joint member.

5. The wall structure according to claim 4.

7. The two plate materials have through holes formed therein for inserting the first insertion member, the second insertion member, and the fourth insertion member therethrough, and the through hole for inserting the fourth insertion member therethrough is filled with a member having the same layer structure as the two plate materials.

7. The wall structure according to claim 6.

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