Metallic floor panel

Abstract

To provide a metallic floor panel allowing a bottom plate and a top plate to be thinner and capable of suppressing generation of crimp failure.SOLUTION: A metallic floor panel 100 is provided with: a bottom plate 1 consisting of a metallic plate; and a top plate 2 consisting of a metallic plate and arranged above the bottom plate 1. The bottom plate 1 has a fixation part 10 fixed on the top plate 2. The fixation part 10 is fixed on the top plate 2 with adhesive 3 and fixed by crimping.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to metal floor panels. [Background technology]

[0002] Patent Document 1 discloses a metal floor panel. This floor panel includes a bottom plate and a top plate made of metal. The bottom plate and the top plate are integrated by plastically deforming a part of the plate into a hole and then crimping the plate to fix the plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-131732 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned floor panel, when the bottom plate or top plate is made thinner, there is a risk of crimping defects such as cracks occurring in the crimped parts, the crimped parts not being crushed to the appropriate thickness, etc. If crimping defects occur in this way, problems will occur such as the bottom plate and the top plate not being sufficiently fixed, or noise being generated when stepping on the poorly crimped part.

[0005] In view of the above circumstances, an object of the present disclosure is to provide a metal floor panel that can suppress the occurrence of crimping defects even if the bottom plate and top plate are made thin. [Means for solving the problem]

[0006] A metal floor panel according to one aspect of the present disclosure includes a bottom plate made of a metal plate, and a top plate made of a metal plate and disposed above the bottom plate. The bottom plate has a fixing portion fixed to the top plate. The fixing portion is fixed to the top plate by an adhesive and by crimping. Effect of the Invention

[0007] In one embodiment of the metal floor panel according to the present disclosure, the occurrence of crimping defects can be suppressed even if the bottom plate and top plate are made thin. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view of a metal floor panel according to a first embodiment of the present disclosure. [Diagram 2] FIG. 2 is a bottom view of the metal floor panel. [Diagram 3] FIG. 3 is a perspective view of a bottom plate of the metal floor panel. [Figure 4] 4A is a cross-sectional view taken along line AA in FIG. 1, and FIG. 4B is an enlarged view of part B in FIG. 4A. [Diagram 5] FIG. 5 is an enlarged view showing a part of the modified example of the metal floor panel of the same embodiment. [Figure 6] FIG. 6A is a plan view showing a metal floor panel according to a second embodiment of the present disclosure, and FIG. 6B is a cross-sectional view taken along line CC in FIG. 6A. [Figure 7] FIG. 7A is a plan view showing a first modified example of the metal floor panel, and FIG. 7B is a cross-sectional view taken along line DD in FIG. 7A. [Figure 8] FIG. 8A is a plan view showing modified example 2 of the metal floor panel of the same embodiment, and FIG. 8B is a cross-sectional view taken along line EE of FIG. 8A. [Figure 9] FIG. 9 is a plan view showing a third modified example of the metal floor panel of the same embodiment. [Figure 10] 10A is a cross-sectional view taken along line FF in FIG. 9, and FIG. 10B is a cross-sectional view taken along line GG in FIG. [Figure 11] FIG. 11 is a plan view of a metal floor panel according to a third embodiment of the present disclosure. [Figure 12] FIG. 12 is a bottom view of the metal floor panel. [Figure 13]FIG. 13A is a perspective view showing a reinforcing rib provided on the metal floor panel of the same, and FIG. 13B is a perspective view showing a modified example of the reinforcing rib of the same. [Figure 14] FIG. 14 is a cross-sectional view taken along line HH in FIG. [Figure 15] FIG. 15 is a plan view of a metal floor panel according to a fourth embodiment of the present disclosure. [Figure 16] FIG. 16 is a bottom view of the metal floor panel. [Figure 17] FIG. 17 is a cross-sectional view taken along line II in FIG. [Figure 18] FIG. 18A is a perspective view showing a bottom plate body of a bottom plate included in the metal floor panel, and FIG. 18B is a perspective view showing an edge material of the bottom plate. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (Embodiment 1) 1. Overview A metal floor panel 100 (hereinafter referred to as "panel 100") of embodiment 1 shown in Figures 1 to 4A and 4B comprises a bottom plate 1 made of a metal plate, and a top plate 2 made of a metal plate and disposed above the bottom plate 1. The bottom plate 1 has a fixing portion 10 fixed to the top plate 2. The fixing portion 10 is fixed to the top plate 2 with an adhesive 3 and by crimping.

[0010] In the panel 100 of embodiment 1 having the above configuration, the fixing portion 10 of the bottom plate 1 is fixed to the top plate 2 by adhesive 3 and crimping, so that the adhesive 3 can get into the crimped portion and the occurrence of crimping defects can be suppressed. In addition, in the panel 100 of embodiment 1, the bottom plate 1 and the top plate 2 can be fixed by adhesive 3 and crimping, so that the number of crimps required to fix the bottom plate 1 and the top plate 2 can be reduced compared to when fixing by crimping only. Therefore, in the panel 100 of embodiment 1, the occurrence of crimping defects can be suppressed and it is easy to manufacture.

[0011] 2.Details Next, the panel 100 of the first embodiment will be described in more detail. The panel 100 of the present embodiment is installed on the floor substrate of a building via a plurality of support legs (not shown) to form a raised floor. An underfloor space for arranging wiring or equipment is formed between the panel 100 thus installed and the floor substrate.

[0012] 1 and 2, the panel 100 is formed in a rectangular shape, more specifically, a square shape, in a plan view (viewed from above) and a bottom view (viewed from below). The panel 100 includes a bottom plate 1 and a top plate 2 disposed above the bottom plate 1.

[0013] 2-1.Bottom plate The bottom plate 1 shown in Figs. 2, 3 and 4A constitutes the lower surface of the panel 100. The bottom plate 1 is made of a metal plate, and is formed, for example, by press-forming the metal plate. As the metal plate, for example, a hot-dip galvanized steel plate is used. The thickness of the metal plate is, for example, 0.8 mm, and is preferably 0.6 mm or more and 0.9 mm or less. The thickness of the metal plate can be appropriately changed according to the strength required for the panel 100, the material of the metal plate, etc.

[0014] The bottom plate 1 is formed in the shape of a shallow rectangular box that opens upward. The bottom plate 1 has a fixing portion 10 that is fixed to the top plate 2. The bottom plate 1 includes a lower plate portion 11 that is located below and spaced apart from the top plate 2, an outer peripheral plate portion 12 that protrudes upward from the outer periphery of the lower plate portion 11, and a plurality of dimples 13 that are recessed upward from a portion of the lower plate portion 11. The fixing portion 10 includes an apex 120 of the outer peripheral plate portion 12 and apexes 130 of the plurality of dimples 13.

[0015] The lower plate portion 11 is rectangular in plan view or bottom view, more specifically, square in shape. The lower plate portion 11 is provided with a plurality of pedestals 14 that protrude upward and are recessed downward. Specifically, the lower plate portion 11 is provided with four pedestals 14 that are triangular in plan view or bottom view. Each of the four pedestals 14 is formed by bending a portion surrounded by the four sides and a pair of diagonals of the rectangular lower plate portion 11 so as to protrude upward. Each pedestal portion 14 is disposed such that one apex of the triangle is closest to the center of the lower plate portion 11 in plan view or bottom view, and the side opposite the apex is disposed along one of the four sides of the lower plate portion 11.

[0016] Each of the base portions 14 has an upper base portion 140 that is triangular in plan view or bottom view, and a peripheral wall portion 141 that extends downward from the outer periphery of the upper base portion 140. The upper base portion 140 is flat. The upper base portion 140 is located downwardly away from the top plate 2.

[0017] The lower plate portion 11 further includes four band-shaped portions 110 along the four sides of the lower plate portion 11, a central portion 111 located at the intersection of a pair of diagonals of the lower plate portion 11, four corner portions 112 located at both ends of the pair of diagonals of the lower plate portion 11, and four intermediate portions 113 located between the central portion 111 and the four corner portions 112.

[0018] The lower surfaces of the four band-shaped portions 110, the central portion 111, and the four corner portions 112 are at the same vertical position and constitute the lowermost surface of the lower plate portion 11. The four intermediate portions 113 are located slightly higher than the central portion 111 and the four corner portions 112, and are smoothly continuous with the central portion 111 and the four corner portions 112.

[0019] A plurality of dimples 13 recessed upward are formed in the lower plate portion 11. Each of the plurality of dimples 13 is hemispherical, protruding upward and opening downward. Each of the plurality of dimples 13 has a disk-shaped top portion 130 and a hemispherical peripheral wall portion 131. Each of the plurality of dimples 13 is formed by bending a portion of the lower plate portion 11 so that it protrudes upward. Each of the plurality of dimples 13 is formed by performing a drawing process on a portion of the lower plate portion 11.

[0020] The multiple dimples 13 include multiple first dimples 13a located on a pair of diagonals of the lower plate portion 11, and multiple second dimples 13b located in each of the four triangular portions surrounded by the pair of diagonals of the lower plate portion 11.

[0021] The first dimples 13a are provided at the center 111, the four corners 112, and the four intermediate portions 113 of the lower plate portion 11. Some of the first dimples 13a are provided so as to extend from the corners 112 to the intermediate portion 113. The second dimples 13b are provided at the upper bottom portion 140 of each of the four base portions 14. Six second dimples 13b are formed in the upper bottom portion 140 of each base portion 14. The four band-shaped portions 110 of the lower plate portion 11 do not have dimples 13 formed therein and are flat.

[0022] Each of the first dimple 13a and the second dimple 13b has a disk-shaped apex 130a, 130b fixed to the top plate 2 and a hemispherical peripheral wall 131a, 131b. The area of ​​the upper surface of each of the apex 130b of the second dimples 13b is larger than the area of ​​the upper surface of each of the apex 130a of the first dimples 13a. The diameter of the upper surface of the apex 130a is, for example, 18 mm, and the diameter of the upper surface of the apex 130b is, for example, 20 mm. The diameters of the upper surfaces of the apexes 130a, 130b are not limited to the above values ​​and can be set appropriately.

[0023] The first dimple 13a is longer in the up-down direction than the second dimple 13b. The inclination of the peripheral wall portion 131a of the first dimple 13a relative to the apex 130a is greater than the inclination of the peripheral wall portion 131b of the second dimple 13b relative to the apex 130b.

[0024] An outer peripheral plate portion 12 protruding upward is formed on the outer peripheral edge of the lower plate portion 11. As shown in Fig. 4B, the outer peripheral plate portion 12 has an outer peripheral piece portion 121 protruding upward from the outer peripheral edge of the lower plate portion 11, a flange piece portion 122 protruding from the upper edge of the outer peripheral piece portion 121 along a horizontal plane to the outside of the bottom plate 1, and a protruding piece portion 123 protruding downward from the outer peripheral edge of the flange piece portion 122. Each of the outer peripheral piece portion 121, the flange piece portion 122, and the protruding piece portion 123 is flat. The flange piece portion 122 constitutes the top portion 120 of the outer peripheral plate portion 12 (i.e., the fixing portion 10).

[0025] The total area of ​​the upper surface of the fixing portion 10 of the bottom plate 1, that is, the total area obtained by adding the area of ​​the upper surfaces of the apexes 130a, 130b of the multiple dimples 13a, 13b and the area of ​​the upper surface of the apex 120 (flange piece portion 122) of the outer peripheral plate portion 12, is, for example, about 12% of the area of ​​the lower surface of the top plate 2 (more specifically, the lower surface of the upper plate portion 20 described later). Note that this ratio is preferably 10% or more and less than 30%.

[0026] 2-2.Tabletop The top plate 2 shown in Fig. 1 and Fig. 4A constitutes the upper surface of the panel 100. The top plate 2 is made of a metal plate, and is formed, for example, by press-forming the metal plate. For example, a hot-dip galvanized steel plate is used as the metal plate. The thickness of the metal plate is, for example, 0.8 mm, and is preferably 0.6 mm or more and 0.9 mm or less. The thickness of the metal plate can be appropriately changed according to the strength required for the panel, the material of the metal plate, etc.

[0027] The top plate 2 is formed in the shape of a shallow rectangular box that opens downward, and includes an upper plate portion 20 and an outer peripheral plate portion 21 that protrudes downward from the outer periphery of the upper plate portion 20.

[0028] The upper plate portion 20 constitutes the upper surface of the top plate 2. The upper plate portion 20 has a rectangular shape in a plan view, more specifically, a square shape in a plan view. The upper plate portion 20 has a flat plate shape.

[0029] The outer peripheral plate portion 21 is made up of four parts protruding from each of the four sides of the upper plate portion 20, which is rectangular in plan view. The four parts are positioned at intervals from one another and are not continuous.

[0030] As shown in Fig. 4B, each of the four parts of the outer peripheral plate portion 21 includes a hanging piece portion 210 protruding downward from the outer peripheral edge of the upper plate portion 20, and a folded piece portion 211 protruding upward from the lower end portion of the hanging piece portion 210 along the inner surface of the hanging piece portion 210. Each of the hanging piece portion 210 and the folded piece portion 211 is flat. The hanging piece portion 210 constitutes the outer peripheral surface of the top plate 2.

[0031] 2-3.Adhesive The adhesive 3 bonds the fixing portion 10 of the bottom plate 1 (i.e., the top 120 of the outer peripheral plate portion 12 and the tops 130a, 130b of the multiple dimples 13a, 13b) to the top plate 2. The adhesive 3 is, for example, a moisture-curing adhesive. The adhesive 3 is applied, for example, by passing the bottom plate 1 through an elastic roll coater. The adhesive 3 is applied only to the fixing portion 10 (tops 120, 130a, 130b) of the bottom plate 1.

[0032] 2-4. Panel structure In the panel 100, the top plate 2 and the bottom plate 1 are fixed together by adhesive 3 and by crimping.

[0033] As shown in FIG. 4A and FIG. 4B, in the panel 100, the upper plate portion 20 of the top plate 2 is located above the lower plate portion 11 of the bottom plate 1. The hanging piece portion 210 of the outer peripheral plate portion 21 of the top plate 2 is located so as to follow the outer surface of the protruding piece portion 123 of the outer peripheral plate portion 12 of the bottom plate 1. The folded piece portion 211 of the outer peripheral plate portion 21 is located below the protruding piece portion 123. The upper surfaces of the apexes 130a, 130b of the multiple dimples 13a, 13b and the upper surface of the flange piece portion 122 (the apex portion 120 of the outer peripheral plate portion 12) are bonded to the lower surface of the upper plate portion 20 by the adhesive 3. The apexes 130a, 130b of the multiple dimples 13a, 13b of the bottom plate 1 and the flange piece portion 122 are each crimped and fixed to the upper plate portion 20. As a result, the top plate 2 and the bottom plate 1 are fixed by the adhesive 3 and crimping.

[0034] In this embodiment, the central portions of the tops 130a, 130b of each dimple 13a, 13b of the lower plate portion 11 and multiple locations in the circumferential direction of the flange piece portion 122, together with a portion of the upper plate portion 20 superimposed thereon, are plastically deformed into downwardly recessed hole shapes and are fixed by crimping.

[0035] The bottom plate 1 and the top plate 2 are formed with a plurality of crimped portions 15, 22 that are plastically deformed into holes. That is, the crimped portions 15, 22 are formed in the center of the tops 130a, 130b of the dimples 13a, 13b of the bottom plate 1, at each of a plurality of circumferential positions of the flange piece portion 122, and at the upper portion of each of the above-mentioned positions of the top plate 2. Each of the crimped portions 15, 22 is circular in plan view, and each of the crimped portions 22 of the top plate 2 is entirely in close contact with the corresponding crimped portion 15 of the bottom plate 1, and is fitted in a state in which the adhesive 3 is inserted between the crimped portions 15, 22. The crimped portions 15, 22 are formed on the bottom plate 1 and the top plate 2 by pressing the overlapped portions in a state in which the tops 130a, 130b of the dimples 13a, 13b of the bottom plate 1 and the top plate 2 are overlapped with the adhesive 3 interposed therebetween.

[0036] In the panel 100 of this embodiment, the bottom plate 1 is firmly joined to the top plate 2 by crimping and fixing at multiple locations on the tops 130a, 130b of each dimple 13a, 13b and the flange piece portion 122, and by fixing with adhesive 3.

[0037] It is preferable to provide an air hole in either the bottom plate 1, the top plate 2, or the space between the bottom plate 1 and the top plate 2, through which air can flow in to harden the adhesive 3.

[0038] 2-5. Panel manufacturing method The above-described panel 100 is manufactured, for example, through the following adhesive application step, top plate arrangement step, and crimping step in that order.

[0039] In the adhesive application step, the bottom plate 1 is passed through a roll coater, and adhesive 3 is applied to the fixing portion 10 of the bottom plate 1 (i.e., the upper surfaces of the apexes 130a, 130b of the multiple dimples 13a, 13b, and the upper surface of the flange piece portion 122 (apex 120)). The adhesive 3 is applied to the entire upper surface of each of the apexes 130a, 130b, 120.

[0040] Next, in the top plate arrangement process, the top plate 2 is placed on the bottom plate 1. As a result, the upper plate portion 20 of the top plate 2 is placed on the apexes 130a, 130b of each dimple 13a, 13b and the flange piece portion 122, and the outer peripheral plate portion 21 of the top plate 2 is arranged outside the outer peripheral plate portion 12 of the bottom plate 1. At this time, the lower surface of the upper plate portion 20 of the top plate 2 is bonded to the upper surfaces of the apexes 130a, 130b of each dimple 13a, 13b and the upper surface of the flange piece portion 122 via the adhesive 3.

[0041] Next, in the crimping process, the centers of the tops 130a, 130b of each of the dimples 13a, 13b of the bottom plate 1 and multiple locations of the flange piece portion 122 are crimped and fixed to the upper plate portion 20 of the top plate 2, thereby fixing the top plate 2 to the bottom plate 1. Here, the crimping is performed by so-called spot crimping, in which the overlapped top plate 2 and part of the bottom plate 1 are sandwiched between a punch and a die, and the parts of the top plate 2 and bottom plate 1 are plastically deformed into downwardly recessed hole shapes.

[0042] 2-6.Effects In the panel 100 of the present embodiment described above, the crimped portions 15 of the tops 130a, 130b of each dimple 13a, 13b of the lower plate portion 11 of the bottom plate 1 and the crimped portions 15 at multiple locations of the flange piece portion 122 are crimped and fixed to the crimped portions 22 of the upper plate portion 20 of the top plate 2 with adhesive 3 sandwiched between them.

[0043] As a result, in the panel 100 of this embodiment, even if a minute gap occurs between the crimped portions 15, 22 during press working, this gap can be filled with the adhesive 3. Furthermore, in the panel 100 of this embodiment, even if a crack occurs in the crimped portions 15, 22, it can be sealed with the adhesive 3. Furthermore, even if the adhesion between the crimped portions 15, 22 is insufficient, the adhesive force of the adhesive 3 can bring the crimped portions 15, 22 into close contact with each other.

[0044] Therefore, in the panel 100 of this embodiment, the occurrence of defective crimping can be suppressed. Also, in the panel 100 of this embodiment, the bottom plate 1 and the top plate 2 are fixed by crimping and by the adhesive 3, so the number of crimps can be reduced compared to when they are fixed only by crimping, and in this respect, the occurrence of defective crimping can also be suppressed. Therefore, in the panel 100 of this embodiment, noise that occurs when a defective crimped portion is stepped on from above can be suppressed.

[0045] Furthermore, in the panel 100 of this embodiment, even if the bottom plate 1 and the top plate 2 are made thin, crimping defects are unlikely to occur, so that the weight of the panel 100 can be reduced, and the material costs of the panel 100 can be reduced.

[0046] Furthermore, in the panel 100 of this embodiment, the bottom plate 1 and the top plate 2 are bonded partially (10 to 30%), so the amount of adhesive 3 applied can be reduced compared to when they are bonded entirely. Therefore, in the panel 100 of this embodiment, the curing time of the adhesive 3 can be reduced, and the manufacturing time of the panel 100 can be shortened.

[0047] In addition, in the panel 100 of this embodiment, the bottom plate 1 and the top plate 2 are fixed with the adhesive 3 and by crimping, so the bottom plate 1 and the top plate 2 can be more firmly joined than when they are fixed only by crimping. Therefore, in the panel 100 of this embodiment, deformation of the top plate 2 due to a static load or a local load during a rolling load can be easily suppressed.

[0048] 3. Variations Next, a description will be given of modifications of the panel 100 of the above-mentioned embodiment 1. The modifications shown below can be appropriately combined.

[0049] 5, the panel 100 may further include a core material 5 filled between the top plate 2 and the remaining portion of the bottom plate 1 excluding the fixing portion 10. The core material 5 is, for example, mortar. In this case, in the panel 100 of the modified example, even if cracks are formed in the crimped portions 15, 22 when the mortar is filled, the adhesive 3 can prevent the mortar from leaking out from the cracks.

[0050] The crimping portions 15, 22 do not have to be formed as part of the bottom plate 1 and the top plate 2, and may be separate members from the bottom plate 1 and the top plate 2. In other words, the top plate 2 and the bottom plate 1 may be crimped and fixed using a separate crimping member.

[0051] In addition, the bottom plate 1 is not limited to the shape shown in Fig. 3 etc. In other words, the shape of the lower plate portion 11 and the arrangement and shape of the multiple dimples 13 are not limited to the shape and arrangement shown in Fig. 3 etc. The bottom plate 1 only needs to have a fixing portion 10 that is fixed to the top plate 2 by adhesive 3 and crimping, and the fixing portion 10 is not limited to the apexes 130a, 130b of the multiple dimples 13a, 13b and the flange piece portion 122 (apex 120) described above.

[0052] Furthermore, the lower plate portion 11 is not limited to a rectangular shape when viewed from the bottom, and may be other shapes such as a circular shape or a polygonal shape when viewed from the bottom. The lower plate portion 11 may be provided in a flat plate shape as a whole, and the multiple dimples 13 may be provided to have the same shape and dimensions as one another. The areas of the upper surfaces of the tops 130 of the multiple dimples 13 may be the same as one another.

[0053] (Embodiment 2) Next, a panel 100 according to embodiment 2 shown in Figures 6A and 6B will be described. In the following, regarding the panel 100 according to embodiment 2, the same components as those in embodiment 1 will be denoted by the same reference numerals in the figures and will not be described again, and components different from embodiment 1 will be described in detail.

[0054] 1.Details In the panel 100 of the second embodiment, the top plate 2 has a plurality of bead portions 23 that protrude downward. Each of the plurality of bead portions 23 contacts two adjacent dimples 13 among the plurality of dimples 13. Each bead portion 23 is formed by performing bead processing on a portion of the upper plate portion 20 of the top plate 2.

[0055] In this embodiment, four bead portions 23 are formed on the upper plate portion 20 of the top plate 2. Each bead portion 23 is a groove extending in one direction. Each bead portion 23 is formed by curving a part of the upper plate portion 20 so that it protrudes downward and opens upward.

[0056] The four bead portions 23 are formed in the upper plate portion 20 above the centers of the upper bottom portions 140 of the four base portions 14. Each bead portion 23 contacts two second dimples 13b located on either side of the center of the upper bottom portion 140 of each base portion 14. Each bead portion 23 extends parallel to an adjacent one of the four sides of the upper plate portion 20 that is rectangular in plan view.

[0057] Each bead portion 23 contacts the outer surfaces of the hemispherical peripheral wall portions 131b of the two second dimples 13b, but does not contact the upper surfaces of the apexes 130b of the two second dimples 13b. The upper plate portion 20 of the top plate 2 is provided with a plurality of positioning protrusions 24 that protrude upward. The protrusions 24 are structured to prevent misalignment between the vertically arranged panels 100 when the multiple panels 100 are stacked vertically and transported.

[0058] In the panel 100 of embodiment 2 described above, a bead portion 23 that contacts two adjacent second dimples 13b of the bottom plate 1 is provided on the upper plate portion 20 of the top plate 2, so that when a downward load is applied to the upper plate portion 20, deflection is less likely to occur.

[0059] Furthermore, in the panel 100 of the second embodiment, the bead portions 23 are provided only in the upper plate portion 20 of the top board 2, in a location that is easily displaced by a downward load (the upper portion of the center of the base portion 14). Therefore, in the panel 100 of the second embodiment, the bending rigidity of the upper plate portion 20 can be improved while keeping the number of bead portions 23 to a minimum.

[0060] 2. Variations Next, modified examples of the panel 100 of the above-mentioned embodiment 2 will be described. The modified examples described below can be combined as appropriate. The panel 100 of embodiment 2 can also be combined as appropriate with the modified examples of the panel 100 of embodiment 1 described above.

[0061] The number and positions of the multiple bead portions 23 are not limited to those shown in FIG. 6A.

[0062] 7A and 7B, the bead portion 23 may extend across the apexes 130b of two adjacent second dimples 13b. In the first modification, the bottom of the bead portion 23 and the apex 130b of the second dimple 13b are fixed by crimping. That is, the crimped portion 22 is formed at the bottom of the bead portion 23.

[0063] In the first modified example, each of the multiple bead portions 23 is located only above the centers of the four upper bottom portions 140. The center portion of the top plate 2 and the top portion 130a of the first dimple 13a located therebelow are fixed with the adhesive 3 and by crimping without the bead portions 23 therebetween.

[0064] Here, in the panel 100 of the first modification, the upper central portions of the four upper bottom portions 140 of the top plate 2 are the weakest portions in terms of load-bearing performance (i.e., the portions most likely to deform when subjected to a downward load). The upper central portions of the four upper bottom portions 140 of the top plate 2 are the portions that are the largest in horizontal distance from the peripheral wall portion 141 and also the largest in distance between two adjacent second dimples 13b, and therefore are the weakest portions in terms of load-bearing performance of the panel 100.

[0065] In the panel 100 of variant 1, a bead portion 23 is provided in each of the four weakest portions, and the bead portions 23 are directly bonded and crimped to the apexes 130b of the two adjacent second dimples 13b, thereby effectively suppressing the amount of deformation in each weakest portion due to a downward load.

[0066] Furthermore, in the panel 100 of the first modification, the center of the top plate 2 is the weakest part in terms of rolling road performance (i.e., the part most likely to form the deepest ruts when a rolling road test is performed). In the panel 100 of the first modification, no bead portion 23 is provided in the center of the top plate 2, and the center of the top plate 2 and the apex 130a of the first dimple 13a located below it are directly bonded and crimped to each other, so that the amount of residual deformation in the weakest part can be effectively suppressed.

[0067] 8A and 8B, the multiple bead portions 23 may include, in addition to bead portion 23a formed in a portion of the upper plate portion 20 above the base portion 14, bead portion 23b formed in a portion of the upper plate portion 20 above the central portion 111 of the lower plate portion 11 of the bottom plate 1. Bead portion 23b is parallel to bead portion 23a and is located closer to the center of the upper plate portion 20 than bead portion 23a.

[0068] In this modified example, a bead portion 23b is formed on the upper plate portion 20 so as to contact one first dimple 13a arranged across the central portion 111 of the lower plate portion 11 and one intermediate portion 113 continuing from the central portion 111, and another first dimple 13a arranged across the central portion 111 of the lower plate portion 11 and another intermediate portion 113 continuing from the central portion 111.

[0069] The bead portion 23b is in contact with the outer surfaces of the hemispherical peripheral wall portions 131a of the two first dimples 13a, but is not in contact with the upper surfaces of the apexes 130a of the two first dimples 13a.

[0070] According to the panel 100 of the second modification, the bending rigidity of the panel 100 can be further improved by the bead portions 23a and 23b.

[0071] In addition, the multiple bead portions 23 may include, in addition to bead portions 23a and 23b, bead portions 23c and 23d formed in the upper plate portion 20 from an upper portion of the base portion 14 of the bottom plate 1 to an upper portion of a pair of diagonal portions of the bottom plate 1, as in variant example 3 shown in Figures 9, 10A and 10B.

[0072] The bead portion 23c is positioned in a straight line with the bead portion 23a. The bead portion 23d is positioned farther from the center of the upper plate portion 20 than the bead portions 23a and 23c.

[0073] In this modification, the plurality of bead portions 23 includes four pairs of two bead portions 23c positioned to sandwich a bead portion 23a therebetween, and also includes four pairs of two bead portions 23d arranged at right angles to each other.

[0074] Each of the bead portions 23c, 23d is formed on the top plate 2 so as to contact the first dimple 13a and the second dimple 13b. Each of the bead portions 23c, 23d contacts the outer surfaces of the hemispherical peripheral wall portions 131a, 131b of the two adjacent dimples 13a, 13b, but does not contact the upper surfaces of the apexes 130a, 130b of the two dimples 13a, 13b.

[0075] Each of the bead portions 23a, 23b does not contact the outer surfaces of the hemispherical peripheral wall portions 131 of the two adjacent dimples 13, but contacts the upper surfaces of the apexes 130 of the two dimples 13. The crimping portion 22 is formed at the bottom portion of the bead portions 23a, 23b.

[0076] The four bead portions 23b are continuous with each other and are arranged in a rectangular frame shape. The bead portion 23a and the two bead portions 23c located on either side of the bead portion 23a are not continuous with each other and are spaced apart from each other. The two bead portions 23d arranged at right angles are not continuous with each other and are spaced apart from each other.

[0077] According to the panel 100 of the third modified example, the bending rigidity in the directions along the four sides of the upper plate portion 20 of the table top 2 can be improved by the bead portions 23a, 23b, 23c, and 23d.

[0078] Furthermore, according to panel 100 of modified example 3, bead portions 23a, 23b are fixed to apexes 130 of two adjacent dimples 13 by crimping portions 22, so that bead portions 23a, 23b more reliably contact two adjacent dimples 13. Therefore, according to panel 100 of modified example 3, bead portions 23a, 23b can more reliably improve the bending rigidity of upper plate portion 20.

[0079] Furthermore, in panel 100 of modified example 3, bead portions 23a, 23b are fixed to apexes 130 of two adjacent dimples 13 by adhesive 3 and crimping portion 22. Therefore, in panel 100 of modified example 3, bead portions 23a, 23b are firmly fixed to two adjacent dimples 13, making it easier for bead portions 23a, 23b and the two adjacent dimples 13 to exert their bending suppression function.

[0080] Furthermore, in the panel 100 of the third modified example, the four bead portions 23b are continuous in a rectangular frame shape, so that the bending rigidity of the upper plate portion 20 can be easily improved in any direction.

[0081] The bead portions 23c and 23d may be fixed to the apexes 130 of two adjacent dimples 13 by the crimping portion 22, similar to the bead portions 23a and 23b.

[0082] (Embodiment 3) Next, a panel 100 of embodiment 3 shown in Figures 11 to 14 will be described. In the following, for the panel 100 of embodiment 3, the same components as those of embodiment 1 are denoted by the same reference numerals in the figures and will not be described again, and components different from embodiment 1 will be described in detail. Note that, although illustration of the crimping portions formed on the bottom plate 1 and the top plate 2 is omitted in Figures 11 to 14, crimping portions similar to the crimping portions 15, 22 of the panel 100 of embodiment 1 are formed on the bottom plate 1 and the top plate 2 in the panel 100 of this embodiment as well.

[0083] 1.Details The panel 100 of the third embodiment further includes a reinforcing rib 4 attached to the lower surface of the top plate 2. The reinforcing rib 4 is fixed to the top plate 2 with an adhesive 3 and is also fixed by caulking.

[0084] 13A shows an example of the reinforcing rib 4. The reinforcing rib 4 is made of a metal plate, and is formed, for example, by press-molding the metal plate. The metal plate may be, for example, a steel plate. The thickness of the metal plate is, for example, 1.2 mm. The thickness of the metal plate can be changed as appropriate according to the strength required for the panel 100, the material of the metal plate, and the like. The reinforcing rib 4 may be formed of the same material as the bottom plate 1 or the top plate 2.

[0085] The reinforcing rib 4 has a plate-shaped fixed portion 40 fixed to the upper plate portion 20 of the top plate 2, and a plate-shaped girder portion 41 extending downward from one end of the fixed portion 40. In this embodiment, the fixed portion 40 is a strip-shaped rectangular plate extending in one direction. The reinforcing rib 4 has the girder portion 41 protruding downward from an end of the fixed portion 40 in the width direction. In this embodiment, the reinforcing rib 4 has a pair of girder portions 41 protruding downward from both ends of the fixed portion 40 in the width direction.

[0086] Each of the pair of girder portions 41 is provided at a right angle to the fixed portion 40. Each of the pair of girder portions 41 has a length covering the entire length of the fixed portion 40 in the longitudinal direction. In this embodiment, each of the pair of girder portions 41 is provided in a trapezoidal shape. Each of the pair of girder portions 41 has a slope portion 410 at both ends in the longitudinal direction of the girder portion 41, the slope portion 410 being shorter in the vertical direction as it approaches the end. The shape of the slope portion 410 is set so as to avoid interference with the dimple 13 or the base portion 14. In the example shown in FIG. 13A, the pair of girder portions 41 have the same vertical length, but the vertical lengths may be different from each other to avoid interference with the base portion 14 or the dimple 13.

[0087] 11, the panel 100 of this embodiment includes a plurality of reinforcing ribs 4. The plurality of reinforcing ribs 4 include a plurality of first reinforcing ribs 4a arranged above the central portion 111 of the lower plate portion 11, and a plurality of second reinforcing ribs 4b arranged above the upper bottom portion 140 of the base portion 14 of the lower plate portion 11. The plurality of reinforcing ribs 4 further include a plurality of third reinforcing ribs 4c arranged so as to straddle above two adjacent base portions 14 of the lower plate portion 11, and a plurality of fourth reinforcing ribs 4d arranged above the four band-shaped portions 110 of the lower plate portion 11.

[0088] In this embodiment, the number of the first reinforcing ribs 4a is eight. The eight first reinforcing ribs 4a are positioned so as to surround the dimple 13 provided in the central portion 111 from all sides. Two first reinforcing ribs 4a are arranged parallel to each other between the central dimple 13 and each of the four base portions 14. The two first reinforcing ribs 4a are arranged parallel to one of the four sides of the upper plate portion 20 of the top plate 2. In this embodiment, of the two first reinforcing ribs 4a, the first reinforcing rib 4a on the base portion 14 side has a vertical length of the pair of girder portions 41 of the pair of girder portions 41 that is shorter than the vertical length of the girder portion 41 on the other side. As a result, the first reinforcing rib 4a on the base portion 14 side avoids interference of the girder portion 41 with the base portion 14.

[0089] In this embodiment, the multiple second reinforcing ribs 4b are four second reinforcing ribs 4b. Each of the four second reinforcing ribs 4b is located between multiple dimples 13 provided on the upper bottom portion 140 of the base portion 14. Each of the four second reinforcing ribs 4b is arranged parallel to one of the four sides of the upper plate portion 20 of the top plate 2. Each of the four second reinforcing ribs 4b is parallel to the two first reinforcing ribs 4a located between the central dimple 13.

[0090] In this embodiment, the plurality of third reinforcing ribs 4c are four third reinforcing ribs 4c. Each of the four third reinforcing ribs 4c is arranged so as to straddle the upper bottom portion 140 of two adjacent base portions 14, sandwiching the middle portion 113 of the lower plate portion 11, among the four base portions 14. Each of the four third reinforcing ribs 4c is located between a plurality of dimples 13 provided on each of the two adjacent base portions 14. Each of the four third reinforcing ribs 4c is located outside the four second reinforcing ribs 4b. Each of the four third reinforcing ribs 4c is arranged so as to form an angle of 45° with respect to one of the four sides of the upper plate portion 20 of the top plate 2. The four third reinforcing ribs 4c are arranged in a square shape in a plan view.

[0091] In this embodiment, the plurality of fourth reinforcing ribs 4d are four fourth reinforcing ribs 4d. Each of the four fourth reinforcing ribs 4d is disposed above one of the four band-shaped portions 110. Each of the four fourth reinforcing ribs 4d is located outside the four third reinforcing ribs 4c. Each of the four fourth reinforcing ribs 4d is disposed parallel to one of the four sides of the upper plate portion 20 of the top plate 2. The four fourth reinforcing ribs 4d are disposed in a square shape in a plan view. Each of the four fourth reinforcing ribs 4d is parallel to one of the four second reinforcing ribs 4b.

[0092] In the panel 100 of this embodiment, the thickness of the metal plates forming the bottom plate 1 and the top plate 2 is, for example, 0.6 mm. Also, in the panel 100 of this embodiment, the shape of the multiple dimples 13 provided on the lower plate portion 11 is different from the multiple dimples 13 of the first embodiment, as shown in Fig. 12. Also, the four intermediate portions 113 of the lower plate portion 11 are provided flush with the central portion 111 and the four corner portions 112.

[0093] A plurality of dimples 13c of the same shape are formed in the central portion 111 and intermediate portion 113 of the lower plate portion 11. Each of the plurality of dimples 13c has a disk-shaped top portion 130c and a corrugated peripheral wall portion 131c. The peripheral wall portion 131c is inclined with respect to the flat central portion 111 or intermediate portion 113 so that the opening area becomes smaller as it approaches the top portion 130c. In this embodiment, the lower end opening of the peripheral wall portion 131c is shaped like an octagonal star.

[0094] Dimples 13d having a different shape from dimples 13c are formed at corners 112 of lower plate 11. Dimples 13d have tops 130d and corrugated peripheral wall portions 131d. Peripheral wall portions 131d are substantially perpendicular to flat corners 112, and the opening area of ​​the upper end is slightly smaller than the opening area of ​​the lower end. The shape of the lower end of peripheral wall portion 131d is similar to the shape of the upper end of peripheral wall portion 131d.

[0095] A plurality of dimples 13e having a shape different from the dimples 13c are formed on the upper bottom portion 140 of the base portion 14. The plurality of dimples 13e have an apex 130e and a corrugated peripheral wall portion 131e. The peripheral wall portion 131e is substantially perpendicular to the flat upper bottom portion 140, and the opening area of ​​the upper end is slightly smaller than the opening area of ​​the lower end. The shape of the lower end of the peripheral wall portion 131e is similar to the shape of the upper end of the peripheral wall portion 131e. The shape of the apex portion 130e is substantially triangular, and each side of the triangle is curved in a wavy manner.

[0096] The peripheral wall 141 of the base 14 includes a corrugated portion. The peripheral wall 141 is generally triangular in bottom view, and each of the three sides includes a corrugated portion. The entire remaining portion of each side, excluding both ends in the length direction, is corrugated.

[0097] The outer peripheral piece portion 121 of the outer peripheral plate portion 12 of the bottom plate 1 includes a corrugated portion. The outer peripheral piece portion 121 is generally rectangular when viewed from the bottom, and each of the four sides includes a corrugated portion. The entire remaining portion of each side, excluding both ends in the length direction, is corrugated.

[0098] In the panel 100 of this embodiment, the tops 130c, 130d, and 130e of the dimples 13c, 13d, and 13e of the bottom plate 1 and the top 120 (flange piece portion 122) of the outer peripheral plate portion 12 are fixed to the upper plate portion 20 of the top plate 2 by adhesive 3 and crimping. The fixing portions 40 of the reinforcing ribs 4a, 4b, 4c, and 4d are fixed to the upper plate portion 20 by adhesive 3 and crimping. As a result, the reinforcing ribs 4a, 4b, 4c, and 4d protrude downward in a rib shape from the upper plate portion 20 of the top plate 2, and the bending rigidity of the upper plate portion 20 can be increased.

[0099] In the panel 100 of this embodiment described above, the bending rigidity of the upper plate portion 20 of the top plate 2 can be increased by the multiple reinforcing ribs 4, so that there is no need to provide a groove-shaped bead portion that opens upward in the upper plate portion 20, and it is easy to provide a flat upper surface of the upper plate portion 20.

[0100] Furthermore, in the panel 100 of this embodiment, the multiple reinforcing ribs 4 can be attached in the same manner as the bottom plate 1 is attached to the top plate 2 (that is, by using adhesive 3 and crimping), so that the reinforcing ribs 4 can be attached easily.

[0101] Furthermore, in the panel 100 of this embodiment, the arrangement of the multiple reinforcing ribs 4 can be made to correspond to the arrangement of the multiple fixing portions 10 (the multiple dimples 13 and the outer peripheral plate portion 21) of the bottom plate 1, making it easy to ensure the bending rigidity of the upper plate portion 20 of the top plate 2 throughout.

[0102] Furthermore, in the panel 100 of this embodiment, each of the multiple reinforcing ribs 4 is smaller than the bottom plate 1 and the top plate 2, so even if the thickness of the metal plate forming each reinforcing rib 4 is increased, an extreme increase in the amount of metal plate used can be suppressed.

[0103] Furthermore, in the panel 100 of this embodiment, the multiple reinforcing ribs 4 are separate components from the top plate 2, so that it is possible to use thick reinforcing ribs 4 while making the top plate 2 thinner, making it easier to ensure the bending rigidity of the upper plate portion 20 of the top plate 2.

[0104] Furthermore, in the panel 100 of this embodiment, each of the multiple reinforcing ribs 4 has a girder portion 41 having a slope portion 410, so that interference of the reinforcing rib 4 with the dimple 13 or base portion 14 can be avoided, making it easier to suppress the occurrence of problems caused by the installation of the reinforcing rib 4.

[0105] Furthermore, in the panel 100 of this embodiment, the reinforcing ribs 4 can be attached later to the portions of the upper plate portion 20 of the top plate 2 that need to be reinforced, thereby preventing the processing of the bottom plate 1 and the top plate 2 from becoming complicated.

[0106] Furthermore, in panel 100 of the present embodiment, peripheral wall portions 131c, 131d, and 131e of the multiple dimples 13c, 13d, and 13e each include a corrugated portion, which makes it easy to improve rigidity against downward loads.

[0107] Furthermore, in the panel 100 of this embodiment, the peripheral wall portions 141 of the multiple base portions 14 and the peripheral piece portions 121 of the peripheral plate portion 12 each include a corrugated portion, which makes it easier to improve rigidity against downward loads.

[0108] 2. Variations Next, modified examples of the panel 100 of the above-mentioned embodiment 3 will be described. The modified examples described below can be appropriately combined. Note that the panel 100 of embodiment 3 can also be appropriately combined with the modified examples of the panel 100 of the above-mentioned embodiments 1 and 2.

[0109] The bottom plate 1 is not limited to the shape shown in Fig. 12 and Fig. 14. The bottom plate 1 may have the same shape as the bottom plate 1 of the panel 100 of the first embodiment. In other words, the panel 100 of the first embodiment may be provided with a plurality of reinforcing ribs 4.

[0110] Furthermore, each of the multiple dimples 13e provided on the base portion 14 may have a shape similar to that of the dimples 13c, and may have a disk-shaped top portion 130e and a corrugated peripheral wall portion 131c.

[0111] Similarly, the multiple dimples 13d provided at the four corners 112 may have a shape similar to that of the dimples 13c, and may have a disk-shaped top portion 130d and a corrugated peripheral wall portion 131d.

[0112] Moreover, the reinforcing rib 4 is not limited to the shape shown in Fig. 13A. Each of the pair of girder portions 41 of the reinforcing rib 4 is not limited to a trapezoidal shape, and may be another shape such as a semicircular shape. Moreover, the reinforcing rib 4 may have only one of the pair of girder portions 41, as in the modified example shown in Fig. 13B.

[0113] Moreover, the arrangement of the multiple reinforcing ribs 4 included in the panel 100 is not limited to the arrangement shown in Fig. 11. Moreover, the panel 100 may include only a part of the multiple reinforcing ribs 4a, 4b, 4c, and 4d described above.

[0114] (Embodiment 4) Next, a panel 100 of embodiment 4 shown in Figures 15 to 18B will be described. In the following, for the panel 100 of embodiment 4, the same components as those of embodiment 1 are denoted by the same reference numerals in the figures and will not be described again, and components different from embodiment 1 will be described in detail. Note that, although illustration of the crimping portions formed on the bottom plate 1 and the top plate 2 is omitted in Figures 15 to 18B, crimping portions similar to the crimping portions 15, 22 of the panel 100 of embodiment 1 are formed on the bottom plate 1 and the top plate 2 in the panel 100 of this embodiment as well.

[0115] 1.Details 16 and 17, in the panel 100 of the fourth embodiment, the bottom plate 1 is provided with a rib-like structure protruding downward from the upper plate portion 20 of the top plate 2. The bottom plate 1 does not have any structure corresponding to the lower plate portion 11 and the multiple dimples 13 of the bottom plate 1 of the panel 100 of the first embodiment.

[0116] The bottom plate 1 comprises a bottom plate body 16 attached to the remaining part of the upper plate portion 20 of the top plate 2 excluding the outer periphery, and four edge members 17 attached to the outer periphery of the upper plate portion 20 of the top plate 2.

[0117] The bottom plate body 16 is formed by bending a strip-shaped metal plate. The thickness of the metal plate is, for example, 1.2 mm. As shown in Figures 16, 17, and 18A, the bottom plate body 16 has a base 160 along the upper plate portion 20 and a rib 161 that is continuous with the base 160 and protrudes downward from the base 160.

[0118] In this embodiment, the base 160 is composed of a pair of horizontal plate portions 162, 163 spaced apart in the horizontal direction. The rib 161 is composed of a pair of parallel vertical plate portions 164, 165 and a connecting plate 166 connecting the lower ends of the pair of vertical plate portions 164, 165.

[0119] A vertical plate portion 164 protrudes downward from the end of the horizontal plate portion 162 adjacent to the horizontal plate portion 163. A vertical plate portion 165 protrudes downward from the end of the horizontal plate portion 163 adjacent to the horizontal plate portion 162. The vertical plate portions 164, 165 are positioned horizontally spaced apart and parallel to each other. The lower ends of the vertical plate portions 164, 165 are connected by a flat connecting plate 166 that is parallel to the horizontal plate portions 162, 163. The connecting plate 166 is continuous with each of the vertical plate portions 164, 165 at right angles. The vertical plate portions 164, 165 and the connecting plate 166 are continuous in an approximately U-shape.

[0120] As shown in Figure 16, the bottom plate main body 16 includes eight trunk portions 16a, 16b extending in eight directions from the center of the upper plate portion 20 which is rectangular in a planar view, and multiple branch portions 16c, 16d, 16e, 16f, 16g extending from each of the eight trunk portions 16a, 16b.

[0121] The eight trunk portions 16a, 16b and the multiple branch portions 16c, 16d, 16e, 16f, 16g extend over the entire remaining portion of the upper plate portion 20 except for the outer periphery.

[0122] The eight stem portions 16a, 16b are arranged at 45° intervals around the center of the upper plate portion 20. The eight stem portions 16a, 16b include four stem portions 16a located on a pair of diagonal lines of the upper plate portion 20 and four stem portions 16b extending from the center of the upper plate portion 20 toward the four sides.

[0123] The branch portions 16c, 16d, 16e, 16f, and 16g include two first branch portions 16c extending in a straight line in opposite directions from a longitudinal middle portion of each trunk portion 16b, and two second branch portions 16d extending in a straight line in opposite directions from one longitudinal end portion (the end portion opposite the center) of each trunk portion 16b. Each of the two first branch portions 16c and the two second branch portions 16d extends at a right angle to the trunk portion 16b.

[0124] The branch portions 16c, 16d, 16e, 16f, and 16g include two first branch portions 16e extending in a straight line in opposite directions from a portion (closer to the center) of each trunk portion 16a, two second branch portions 16f extending in a straight line in opposite directions from an intermediate portion of each trunk portion 16a in the length direction and then extending parallel to the second branch portion 16d, and two third branch portions 16g extending in a straight line in opposite directions from a portion (farther from the center) of each trunk portion 16a in the length direction. The bases of the two first branch portions 16e and the two second branch portions 16f and the two third branch portions 16g each extend at a right angle to the trunk portion 16a.

[0125] Each of the trunk portions 16a, 16b and each of the branch portions 16c, 16d, 16e, 16f, and 16g has a base 160 and a rib 161. Each of the trunk portions 16a, 16b and each of the branch portions 16c, 16d, 16e, 16f, and 16g is arranged so that the bases 160 do not overlap each other in the vertical direction. The vertical lengths of the ribs 161 of each of the trunk portions 16a, 16b and each of the branch portions 16c, 16d, 16e, 16f, and 16g are the same.

[0126] Each of the four rim members 17 is formed by bending a strip-shaped metal plate. As shown in Fig. 17 and Fig. 18B, each of the four rim members 17 has a base 170 along the upper plate portion 20 and a rib 171 protruding downward from the base 170.

[0127] In this embodiment, the base 170 is a rectangular plate extending in one direction. The rib 171 is composed of a pair of vertical plate portions 172, 173 parallel to each other, and a connecting plate 174 connecting the lower ends of the pair of vertical plate portions 172, 173.

[0128] A vertical plate portion 172 protrudes downward from one end portion of the base 170 in the width direction. The vertical plate portions 172, 173 are positioned at a horizontal interval and are parallel to each other. The lower ends of the vertical plate portions 172, 173 are connected by a flat connecting plate 174 that is parallel to the base 170. The connecting plate 174 is continuous with the vertical plate portions 172, 173 at right angles. The vertical plate portions 172, 173 and the connecting plate 174 are continuous in a substantially U-shape. The connecting plate 174 is provided to be wider than the connecting plate 166.

[0129] In the panel 100 of this embodiment, the pair of horizontal plate portions 162, 163 of the base 160 of the bottom plate main body 16 and the bases 170 of the four rim members 17 are fixed to the upper plate portion 20 of the top plate 2 with the adhesive 3 and by crimping. That is, in this embodiment, the pair of horizontal plate portions 162, 163 and the base 170 are the fixing portion 10 of the bottom plate 1 that is fixed to the top plate 2. The pair of horizontal plate portions 162, 163 and the base 170 are arranged so as not to overlap each other in the vertical direction.

[0130] In the panel 100 of this embodiment described above, the bottom plate body 16 and the four rim members 17 each have ribs 161, 171 that protrude downward from the upper plate portion 20 of the top plate 2. Therefore, in the panel 100 of this embodiment, the bending rigidity of the upper plate portion 20 of the top plate 2 can be increased by the bottom plate 1 itself, and a reinforcing rib that is a member separate from the bottom plate 1 and the top plate 2 (i.e., the reinforcing rib 4 of the panel 100 of embodiment 3) is not required.

[0131] Furthermore, in the panel 100 of this embodiment, the bottom plate body 16 has a base 160 composed of a pair of horizontal plate portions 162, 163, and a rib 161 composed of a pair of vertical plate portions 164, 165 and a connecting plate 166. Therefore, in the panel 100 of this embodiment, when a downward load is applied to the upper plate portion 20 of the top plate 2, twisting is unlikely to occur in the rib 161, making it easy to suppress deformation of the upper plate portion 20 of the top plate 2.

[0132] Furthermore, in the panel 100 of this embodiment, the bottom plate body 16 is formed by bending a strip-shaped metal plate and is fixed to the entire upper plate portion 20 of the top plate 2, so that twisting is less likely to occur in the bottom plate body 16, making it easier to improve the bending rigidity of the upper plate portion 20.

[0133] 2. Variations Next, a description will be given of modifications of the panel 100 of the above-mentioned embodiment 4. Note that the modifications described below can be appropriately combined.

[0134] The bottom plate 1 only needs to have a rib-like structure protruding downward from the upper plate portion 20 of the top plate 2, and the structure of the bottom plate 1 is not limited to the structure shown in Fig. 18A. For example, the bottom plate main body 16 may have a base 160 consisting of one horizontal plate portion and a rib 161 consisting of one vertical plate portion.

[0135] In addition, the arrangement pattern of the bottom plate main body 16 in the bottom view is not limited to the arrangement pattern shown in Fig. 16. The bottom plate main body 16 only needs to be arranged so as to extend over the entire upper plate portion 20 of the top plate 2, and may be arranged in other arrangement patterns.

[0136] Furthermore, the bottom plate body 16 and the four rim members 17 do not have to be separate members, and may be provided integrally.

[0137] Furthermore, the connecting plate 166 of the rib 161 of the bottom plate body 16 is not limited to a flat plate shape, but may be a plate curved in an arc shape.

[0138] The bottom plate 1 may be composed of only the bottom plate body 16. In this case, the four rim members 17 may be formed by bending the outer peripheral plate portion 21 of the top plate 2.

[0139] (summary) As in the above-described first to fourth embodiments and their modifications, the panel 100 of the first aspect has the following configuration.

[0140] That is, the panel 100 of the first embodiment includes a bottom plate 1 made of a metal plate, and a top plate 2 made of a metal plate and disposed above the bottom plate 1. The bottom plate 1 has a fixing portion 10 fixed to the top plate 2. The fixing portion 10 is fixed to the top plate 2 with an adhesive 3 and is also crimped.

[0141] In the panel 100 of the first embodiment having the above configuration, the fixing portion 10 of the bottom plate 1 is fixed to the top plate 2 by crimping with the adhesive 3, so that the adhesive 3 can get into the crimped portion and the occurrence of crimping defects can be suppressed. In addition, in the panel 100 of the first embodiment, the bottom plate 1 and the top plate 2 can be fixed by the adhesive 3 and crimping, so that the number of crimps required to fix the bottom plate 1 and the top plate 2 can be reduced compared to when fixing by crimping only. Therefore, in the panel 100 of the first embodiment, the occurrence of crimping defects can be suppressed and it is easy to manufacture.

[0142] As in the above-mentioned first to third embodiments and their modifications, the panel 100 of the second aspect additionally includes the following configuration in addition to the configuration of the first aspect.

[0143] That is, in the panel 100 of the second embodiment, the bottom plate 1 has a lower plate portion 11 located below and spaced apart from the top plate 2, an outer peripheral plate portion 12 protruding upward from the outer periphery of the lower plate portion 11, and a plurality of dimples 13 recessed upward from a part of the lower plate portion 11. The fixing portion 10 includes an apex 120 of the outer peripheral plate portion 12 and apexes 130 of the plurality of dimples 13.

[0144] In the panel 100 of the second embodiment having the above configuration, the outer peripheral plate portion 12 and the multiple dimples 13 improve the rigidity of the bottom plate 1, and as a result, the bending rigidity of the top plate 2 is improved. In addition, in the panel 100 of the second embodiment, a part of the bottom plate 1 (the top 120 of the outer peripheral plate portion 12 and the tops 130 of the multiple dimples 13) is bonded to the top plate 2, so the amount of adhesive 3 applied can be reduced. Also, in the panel 100 of the second embodiment, it is only necessary to apply the adhesive 3 to the top 120 of the outer peripheral plate portion 12 that protrudes upward from a part of the bottom plate 1 and the tops 130 of the multiple dimples 13, so that the application of the adhesive 3 can be easily performed using a device such as a roll coater.

[0145] As in the above-described first to third embodiments and their modifications, the panel 100 of the third aspect additionally includes the following configuration in addition to the configuration of the second aspect.

[0146] That is, in the panel 100 of the third embodiment, the lower plate portion 11 is rectangular in bottom view. The multiple dimples 13 include multiple first dimples 13a located on a pair of diagonal lines of the lower plate portion 11, and multiple second dimples 13b located in each of four triangular portions surrounded by the pair of diagonal lines of the lower plate portion 11. The area of ​​the upper surface of each apex 130b of the multiple second dimples 13b is larger than the area of ​​the upper surface of each apex 130a of the multiple first dimples 13a.

[0147] In the third embodiment of the panel 100 having the above-mentioned configuration, the adhesive 3 can be used to more firmly fix the four triangular portions of the lower plate portion 11, which is rectangular when viewed from the bottom, surrounded by a pair of diagonal lines, to the top plate 2, making it easier to improve the bending rigidity of the top plate 2.

[0148] As in the above-described second embodiment and its modified example, the panel 100 of the fourth aspect additionally includes the following configuration in addition to the configuration of the second or third aspect.

[0149] That is, in the panel 100 of the fourth embodiment, the top plate 2 has a plurality of bead portions 23 that protrude downward. Each of the plurality of bead portions 23 contacts two of the plurality of dimples 13 that are adjacent to each other.

[0150] In the panel 100 of the fourth embodiment having the above configuration, the bead portion 23 in contact with two adjacent dimples 13 reinforces the portion of the top plate 2 between the multiple dimples 13, making it easier to improve the bending rigidity of the top plate 2.

[0151] As in the above-described second embodiment and its modified example, the panel 100 of the fifth aspect additionally includes the following configuration in addition to the configuration of any one of the second to fourth aspects.

[0152] That is, in the panel 100 of the fifth embodiment, the lower plate portion 11 is rectangular in bottom view. The multiple dimples 13 include multiple first dimples 13a located on a pair of diagonals of the lower plate portion 11 and multiple second dimples 13b located in each of four triangular portions surrounded by a pair of diagonals of the lower plate portion 11. The lower plate portion 11 has a base portion 14 that protrudes upward and is recessed downward in the four triangular portions. The base portion 14 has a triangular upper bottom portion 140 and a peripheral wall portion 141 that extends downward from the outer periphery of the upper bottom portion 140. The multiple second dimples 13b are provided on the upper bottom portion 140 and are located at intervals along the three end sides of the upper bottom portion 140. The top plate 2 has multiple bead portions 23 that protrude downward. Each of the plurality of bead portions 23 is located above the center of the upper bottom portion 140 and is in contact with two adjacent second dimples 13b among the plurality of second dimples 13b.

[0153] In the panel 100 of the fifth embodiment having the above-mentioned configuration, the portion above the center of the upper bottom portion 140 of the top plate 2 can be reinforced by the bead portion 23 spanning two adjacent second dimples 13b, and the amount of deformation due to a downward load applied to this portion can be suppressed. Here, the portion above the center of the upper bottom portion 140 of the top plate 2 is far from the peripheral wall portion 141 and the second dimples 13b, and is likely to be the weakest portion of the load-bearing performance of the panel 100. However, in the panel 100 of the fifth embodiment, the weakest portion of the load-bearing performance of the panel 100 can be reinforced by the bead portion 23, so that the entire panel 100 is likely to have excellent load-bearing performance.

[0154] As in the first modification of the second embodiment described above, the panel 100 of the sixth aspect additionally includes the following configuration in addition to the configuration of the fifth aspect.

[0155] That is, in the panel 100 of the sixth embodiment, the bottom of the bead portion 23 and the tops 130b of two adjacent second dimples 13b are fixed with the adhesive 3 and also fixed by caulking.

[0156] In the panel 100 of the sixth embodiment having the above configuration, the bead portion 23 and the two second dimples 13b can be fixed together with the bead portion 23 being supported from below by the apexes 130b of the two adjacent second dimples 13b. Therefore, in the panel 100 of the sixth embodiment, the weakest portion of the load-bearing performance of the panel 100 can be more reliably reinforced by the bead portion 23, and the entire panel 100 is likely to have excellent load-bearing performance.

[0157] As in the first modification of the second embodiment described above, the panel 100 of the seventh aspect additionally includes the following configuration in addition to the configuration of the fifth or sixth aspect.

[0158] That is, in the seventh embodiment of the panel 100, each of the multiple bead portions 23 is located only above the center of the upper bottom portion 140. The center of the top plate 2 and the top portion 130a of the first dimple 13a located therebelow are fixed with the adhesive 3 and are also fixed by crimping.

[0159] In the seventh embodiment of the panel 100 having the above-mentioned configuration, no bead portion 23 is provided in the central portion of the top plate 2, which is likely to be the weakest part in terms of rolling load performance. This makes it possible to effectively suppress the amount of residual deformation in this weakest part, and makes it easier for the entire panel 100 to have excellent rolling load performance.

[0160] As in the above-described third embodiment and its modified example, the panel 100 of the eighth aspect additionally includes the following configuration in addition to the configuration of any one of the first to seventh aspects.

[0161] That is, the panel 100 of the eighth embodiment further comprises a reinforcing rib 4 attached to the lower surface of the top plate 2. The reinforcing rib 4 is fixed to the top plate 2 with an adhesive 3 and is also fixed by caulking.

[0162] In the panel 100 of the eighth embodiment having the above-mentioned configuration, the reinforcing ribs 4 improve the bending rigidity of the top plate 2, and it is not necessary to form the bead portions 23 on the top plate 2, making it easy to provide a flat upper surface for the top plate 2.

[0163] As in the above-described first to fourth embodiments and their modifications, the panel 100 of the ninth aspect additionally includes the following configuration in addition to the configuration of any one of the first to eighth aspects.

[0164] That is, the panel 100 of the ninth embodiment further includes a core material 5 filled between the top plate 2 and the remaining portion of the bottom plate 1 excluding the fixing portion 10 .

[0165] In the panel 100 of the ninth embodiment having the above configuration, when filling the space between the bottom plate 1 and the top plate 2 with a core material 5 made of a fluid material such as mortar, even if a crack occurs in the crimped portion between the bottom plate 1 and the top plate 2, the adhesive 3 can prevent the core material 5 from leaking out from the crack. Therefore, the panel 100 of the ninth embodiment can easily have a structure in which the core material 5 is filled between the bottom plate 1 and the top plate 2.

[0166] The present disclosure has been described above based on the embodiments shown in the attached drawings, but the present disclosure is not limited to the above embodiments, and appropriate design changes are possible within the intended scope of the present disclosure. [Explanation of symbols]

[0167] 1 Bottom plate 10 Fixed part 11 Lower plate part 12 Outer periphery plate 120 Top 13 Dimples 13a First Dimple 13b Second dimple 130 Top 130a top 130b top 14 Base 140 Upper bottom 141 Peripheral wall section 2. Tabletop 23 Bead section 3. Glue 4 Reinforcing ribs 5 Core material 100 Metal Floor Panels

Claims

1. A bottom plate made of a metal plate; A top plate made of a metal plate and disposed above the bottom plate; The bottom plate is A fixing portion is fixed to the top plate, The fixing portion is fixed to the top plate by adhesive and by crimping. A metal floor panel.

2. The bottom plate has a lower plate portion located below and spaced apart from the top plate, an outer peripheral plate portion protruding upward from an outer peripheral edge of the lower plate portion, and a plurality of dimples recessed upward from a portion of the lower plate portion, the fixing portion includes a top portion of the outer peripheral plate portion and top portions of the plurality of dimples, 2. The metal floor panel of claim 1.

3. The lower plate portion is rectangular in bottom view, the plurality of dimples include a plurality of first dimples located on a pair of diagonal lines of the lower plate portion, and a plurality of second dimples located in each of four triangular portions surrounded by the pair of diagonal lines of the lower plate portion, an area of ​​an upper surface of a vertex of each of the plurality of second dimples is greater than an area of ​​an upper surface of a vertex of each of the plurality of first dimples; 3. The metal floor panel of claim 2.

4. The top plate has a plurality of bead portions protruding downward, Each of the plurality of bead portions is in contact with two adjacent dimples among the plurality of dimples.

4. A metal floor panel according to claim 2 or 3.

5. The lower plate portion is rectangular in bottom view, the plurality of dimples include a plurality of first dimples located on a pair of diagonal lines of the lower plate portion, and a plurality of second dimples located in each of four triangular portions surrounded by the pair of diagonal lines of the lower plate portion, The lower plate portion has a platform portion that protrudes upward and is recessed downward in the four triangular portions, The base portion has a triangular upper base and a peripheral wall portion extending downward from an outer periphery of the upper base, the second dimples are provided on the upper base and are spaced apart along three edges of the upper base, The top plate has a plurality of bead portions protruding downward, Each of the plurality of bead portions is located above a center of the upper bottom portion and is in contact with two adjacent second dimples among the plurality of second dimples.

3. The metal floor panel of claim 2.

6. a bottom portion of the bead portion and a top portion of each of the adjacent two second dimples are fixed to each other by the adhesive and by crimping; 6. The metal floor panel of claim 5.

7. Each of the plurality of bead portions is located only above a center portion of the upper base portion, The central portion of the top plate and the apex of the first dimple located therebelow are fixed with the adhesive and are also fixed by caulking.

7. A metal floor panel according to claim 5 or 6.

8. Further, a reinforcing rib is attached to the lower surface of the top plate, The reinforcing rib is fixed to the top plate by adhesive and by crimping.

4. A metal floor panel according to any one of claims 1 to 3.

9. The base plate further includes a core material filled between the top plate and a remaining portion of the base plate excluding the fixing portion. A metal floor panel according to any one of claims 1 to 3.

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