WO2024135681A1 - Floor panel, floor panel support structure, and floor panel supporter - Google Patents

Abstract

The floor panel according to the present disclosure has a core material (2), a lower plate (4), and an upper plate (3). The core material (2) has an upper surface (2a), a lower surface (2b), and a side surface (2c). The lower plate (4) has a lower plate covering part (4a) that covers the lower surface (2b) of the core material (2). The upper plate (3) comprises: an upper surface covering part (3a) that covers the upper surface (2a) of the core material (2); an upper plate side surface covering part (3b) that is bent continuously from the upper surface covering part (3a), and covers the side surface (2c); an upper plate side surface extending part (3c) extending downward continuously from the upper plate side surface covering part (3b); an upper plate side surface bent-back part (3d) that is bent back continuously from the upper plate side surface extending part (3c); and a joint part (30) that is bent along the lower plate covering part (4a) continuously from the upper plate side surface bent-back part (3d), and is joined onto the lower surface of the lower plate (4).

Description

Floor panel, floor panel support structure and floor panel support

The present invention relates to a floor panel, a floor panel support structure, and a floor panel support that are suitable for installation above a floor slab to form a double floor.

Offices and other places where a large amount of office equipment is used often have double flooring.
This type of double floor has a number of support legs erected on a floor slab, which support the corners of the floor panels to form a wiring space between the floor slab and the floor panels, and cables are routed through this wiring space.

The applicant previously proposed a floor panel for use in a double flooring system, which comprises a core material, an upper plate covering the upper surface of the core material, and a lower plate covering the lower surface of the core material, the core material having side surfaces rising vertically from the lower surface, the lower plate having a lower surface covering portion covering the lower surface of the core material, and a lower plate side surface covering portion which is bent continuously from the lower surface covering portion along the side surface to cover at least a part of the side surface, the upper plate having an upper surface covering portion covering the upper surface of the core material, an upper plate side surface covering portion which is bent continuously from the upper surface covering portion along the side surface to cover the side surface, and a joint which is bent continuously from the upper plate side surface covering portion along the lower surface covering portion to be joined to the lower surface of the lower plate, the joint being deformed by the upper plate and lower plate being pressed from below with a pressing tool to be joined to the lower plate or the core material.

This type of floor panel is formed by folding, not drawing, the upper and lower panels that cover the core material, so it can be manufactured as easily as origami if you have a development diagram, and there is less waste and discarded after processing, improving yield efficiency. Also, compared to drawing, bending can reduce the inner radius of the bent part, so when placing a pre-formed core material such as particle board in the recess of the lower panel, gaps are less likely to occur, improving the filling rate and increasing strength.

JP 2023-151106 A

In floor panels such as those described in Patent Document 1, the upper and lower panels are pressed together to deform the joint with the lower panel or core material, for example when burring is performed, which can cause distortion in the lower panel.
In particular, if an attempt is made to join all of the edges of a floor panel (for example, all four sides in the case of a square) at the same time in order to improve manufacturing efficiency, distortion will accumulate inward from all of the edges of the lower panel, causing the lower panel to bulge downward and lift off the core material.

The problem that this invention aims to solve is to provide a floor panel, floor panel support structure, and floor panel support that are strong, ensure the joint strength between the upper and lower panels, and suppress distortion of the lower panel.

The floor panel of aspect 1 according to the present disclosure comprises a core material, an upper plate covering the upper surface of the core material, and a lower plate covering the lower surface of the core material, the core material having a side surface rising vertically from the lower surface, the lower plate having a lower surface covering portion covering the lower surface of the core material, the upper plate comprising an upper surface covering portion covering the upper surface of the core material, an upper plate side surface covering portion which is continuous from the upper surface covering portion and folded along the side surface to cover the side surface, an upper plate side surface extension portion which is continuous from the upper plate side surface covering portion and extends downward, an upper plate side surface fold portion which is continuous from the upper plate side surface extension portion and folded along the upper plate side surface extension portion, and a joint portion which is continuous from the upper plate side surface fold portion and folded along the lower surface covering portion to be joined to the lower surface of the lower plate.

The floor panel of aspect 2 according to the present disclosure is characterized in that, in the above-mentioned aspect 1, the upper plate has a regulating recess formed on the upper surface of the upper plate, the lower plate has a regulating protrusion on the lower surface of the lower plate that can engage with the regulating recess, and the protruding length of the regulating protrusion is longer than the height of the reinforcing rib formed by the upper plate side extension portion and the upper plate side fold portion.

The floor panel of aspect 3 according to the present disclosure is characterized in that in aspect 2, the protruding length of the regulating protrusion is longer than the sum of the height of the reinforcing rib and the depth of the regulating recess.

The floor panel of aspect 4 according to the present disclosure is characterized in that in any one of aspects 1 to 3, the joint has a deformed joint that is deformed and joined to the lower plate by pressing the upper plate and the lower plate from below with a pressing tool.

The floor panel of aspect 5 according to the present disclosure is characterized in that, in any one of aspects 1 to 3, the joint has a deformed joint that is deformed by pressing the upper plate and the lower plate from below with a pressing tool, and is joined to the lower part of the core material by biting into the lower part of the core material.

The floor panel of aspect 6 according to the present disclosure is characterized in that, in any one of aspects 1 to 3, the joint has a through hole, and has a deformed joint that is deformed by pressing the upper plate and the lower plate from below the through hole with a pressing tool, and is joined to the lower part of the core material by biting into the lower part of the core material.

The floor panel support structure of aspect 7 according to the present disclosure has a structure in which a floor panel including a core material, an upper plate covering the upper surface of the core material, and a lower plate covering the lower surface of the core material is supported by a floor panel support, and in the floor panel, the core material has a side surface rising vertically from the lower surface, the lower plate has a lower surface covering portion covering the lower surface of the core material, the upper plate has an upper surface covering portion covering the upper surface of the core material, an upper plate side surface covering portion that is continuously bent from the upper surface covering portion along the side surface to cover the side surface, and a lower plate supporting the upper plate from the upper plate side surface covering portion. The floor panel support has an upper plate side extension extending downward from the upper plate side extension, an upper plate side fold back portion that is continuous from the upper plate side extension and folded back along the upper plate side extension, and a joint that is continuous from the upper plate side fold back portion and folded back along the lower surface covering portion and joined to the lower surface of the lower plate, and the floor panel support has a receiving base on which the floor panel is placed, the receiving base has a storage groove, and the upper plate side extension and the upper plate side fold back portion of the upper plate are stored in the storage groove.

The floor panel support structure of aspect 8 according to the present disclosure is characterized in that in aspect 7, the joint is housed in the housing groove.

The floor panel support of aspect 9 according to the present disclosure is a support for supporting a floor panel having a core material, an upper plate covering the upper surface of the core material, and a lower plate covering the lower surface of the core material, and in the floor panel, the core material has a side surface rising vertically from the lower surface, the lower plate has a lower surface covering portion covering the lower surface of the core material, the upper plate has an upper surface covering portion covering the upper surface of the core material, an upper plate side surface covering portion that is continuously bent from the upper surface covering portion along the side surface to cover the side surface, and the upper plate side surface covering The floor panel support has an upper plate side extension that extends downward from the covering portion, an upper plate side fold that is continuous from the upper plate side extension and folded back along the upper plate side extension, and a joint that is continuous from the upper plate side fold that is folded back along the lower surface covering portion and joined to the lower surface of the lower plate. The floor panel support has a receiving base on which the floor panel is placed, and the receiving base has a receiving groove that can receive the upper plate side extension and the upper plate side fold.

The floor panel support of aspect 10 according to the present disclosure is characterized in that in aspect 9, the accommodation groove is further capable of accommodating the joint.

In the floor panel of the present invention, the upper plate is formed with a reinforcing rib consisting of an upper plate side extension portion that extends downwardly continuously from the upper plate side covering portion, and an upper plate side fold portion that is continuous from the upper plate side extension portion and folded back along the upper plate side extension portion, thereby increasing the strength of the peripheral portion of the floor panel.
In addition, since the joint is pressed and supported from below by the folded portion of the upper plate side of the reinforcing rib, distortion of the lower plate can be suppressed and the joint strength between the upper and lower plates can be increased compared to a plate that is simply folded without providing a reinforcing rib.
Furthermore, it is possible to omit or reduce the number of locations where burring or the like is performed to press and deform the joint portion to join it to the core material or the lower plate, thereby further suppressing distortion of the lower plate.

In addition, if a regulating recess is formed on the top surface of the upper plate, a regulating protrusion that can engage with the regulating recess is formed on the bottom surface of the lower plate, and the protruding length of the regulating protrusion is made longer than the height of the reinforcing rib formed by the upper plate side extension and upper plate side fold, even if the panels are stacked without engaging the regulating protrusion and regulating recess, the reinforcing rib will not come into contact with the top surface of the lower floor panel, preventing damage to the joints and reinforcing rib.

In addition, if the protruding length of the regulating convex portion is made longer than the sum of the height of the reinforcing rib and the depth of the regulating concave portion, when the regulating convex portion and the regulating concave portion are engaged and stacked, the reinforcing rib will not come into contact with the top surface of the lower floor panel, preventing damage to the reinforcing rib or joint.

In addition, the bent joint of the upper plate is deformed and joined to the lower plate by pressing the upper and lower plates from below with a pressing tool, so there is no downward protrusion on the underside of the joint, and so even if the overlapping floor panels shift, they will not get caught and the joint will not be damaged. Also, no separate joining tool is required, making it easy to join.

In addition, the bent joint of the upper plate is deformed by pressing the upper and lower plates from below with a pressing tool, and it bites into the lower part of the core material and is joined to the lower plate, making the upper and lower plates less likely to peel off and creating a strong structure.

In addition, the bent joint of the upper plate has a through hole, and when the upper and lower plates are pressed from below the through hole with a pressing tool, the plate is deformed and bites into the lower part of the core material to be joined to the lower plate, making it easy to position the pressing tool and also facilitating efficient deformation and joining.

According to the floor panel support structure and floor panel support of the present invention, the receiving base on which the floor panel is placed is provided with a storage groove, and the upper plate side extension and upper plate side fold of the floor panel are stored in the storage groove, so the floor panel does not wobble on the receiving base, and there is no need to install cushioning material or the like on the upper surface of the receiving base to absorb the protruding length of the upper plate side extension and upper plate side fold that protrude downward.

In addition, the joints are housed in the housing grooves, which prevents the floor panel from rattling due to the joints overlapping below the bottom plate.

FIG. 2 is a plan view of the floor panel according to the first embodiment of the present invention. FIG. 2 is a bottom view of the floor panel according to the first embodiment of the present invention. 2 is a cross-sectional view taken along line AA of FIG. 1. This is a cross-sectional view taken along line B-B of FIG. 4 is a cross-sectional view of a main portion of the floor panel according to the first embodiment of the present invention during manufacture. FIG. 1 is a cross-sectional view of a main portion of a floor panel support structure according to a first embodiment of the present invention. 1 is a cross-sectional view of a main portion showing a storage groove formed along a nut portion in a floor panel support structure according to a first embodiment of the present invention. 3 is a cross-sectional view of a main portion showing a storage groove formed along a partition wall in the floor panel support structure according to the first embodiment of the present invention. FIG. 1 is a plan view of a main portion of a floor panel support structure according to a first embodiment of the present invention; FIG. 2 is a perspective view of a cradle according to the first embodiment of the present invention. FIG. 2 is a plan view of the receiving platform according to the first embodiment of the present invention. FIG. 5 is a plan view of a floor panel according to a second embodiment of the present invention. FIG. 6 is an enlarged plan view of a main portion of a floor panel according to a second embodiment of the present invention. This is a cross-sectional view taken along the line CC of FIG. FIG. 10 is a plan view of a floor panel according to a third embodiment of the present invention. FIG. 10 is a plan view of a floor panel according to a fourth embodiment of the present invention. FIG. 13 is a plan view of a floor panel according to a fifth embodiment of the present invention. FIG. 13 is a plan view of a floor panel according to a sixth embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
It goes without saying that the present invention is not limited to the embodiments.

[First embodiment]
A first embodiment of the present invention will now be described with reference to FIGS.

FIG. 1 is a plan view of the floor panel according to the first embodiment, FIG. 2 is an underside view of the floor panel, FIG. 3 is a cross-sectional view taken along line A-A in FIG. 1, FIG. 4 is a cross-sectional view taken along line B-B in FIG. 1, FIG. 5 is a cross-sectional view of the main parts of the floor panel during manufacture, FIG. 6A, FIG. 6B, and FIG. 6C are cross-sectional views of the main parts of the floor panel support structure, FIG. 7 is a plan view of the main parts of the floor panel support structure, FIG. 8 is an oblique view of the receiving base, and FIG. 9 is a plan view of the receiving base.

As shown in Figures 1 to 4, the floor panel 1 of this embodiment is a roughly square shape with sides 1a measuring approximately 500 mm in length and width, and comprises a core material 2, an upper plate 3 that covers the upper surface 2a of the core material 2, and a lower plate 4 that covers the lower surface 2b of the core material 2.

The four corners 1b of the floor panel 1 are formed with triangular chamfered portions 20, and a step portion 21 is formed on the upper surface of each corner 1b.
The step portion 21 is formed about 4 to 5 mm lower than the upper surface, which is the tread surface, of the floor panel 1 .
A rising portion 22 is formed continuing from the upper surface of the floor panel 1 to the step portion 21 .

The rising portion 22 is linear and parallel to the end face of the chamfered portion 20 in a plan view.
The rising portion 22 is also slightly inclined so as to gradually approach the end face of the chamfered portion 20 in the downward direction.

The core material 2 is made of a wood material, such as particle board, and has a thickness of, for example, about 20 mm.
In particular, the particle board used as the core material 2 can have a three-layer structure with dense hard layers on the front and back sides and a relatively coarse soft layer in the middle, which can efficiently ensure bending strength. The particle board is useful for floor panels that are expected to bear a relatively large load, such as office floors, because bending strength is required.
Furthermore, core material 2 made of wood such as particle board can contribute significantly to the positive use of domestic timber, against the backdrop of the establishment of the Law on the Promotion of the Use of Wood in Public Buildings, etc., and efforts such as the Minato Model Carbon Dioxide Fixation Certification System.

The core material 2 is a rectangular parallelepiped with an upper surface 2a and a lower surface 2b, and a side surface 2c that rises vertically from the lower surface 2b.

The core material 2 has a chamfered core section 2d, which has four corners 1b that are triangularly chamfered to form a straight line, a stepped core section 2e that is formed continuous with the chamfered core section 2d, and a rising core section 2f that is continuous with the stepped core section 2e and rises in a straight line on the upper surface 2a parallel to the chamfered core section 2d.

The upper plate 3 and the lower plate 4 are metal plates such as galvanized steel plates, and their thickness is approximately 0.3 mm, which is thinner than the thickness of the core material 2.

The lower plate 4 has a lower surface covering portion 4a that covers the lower surface 2b of the core material 2, and a lower plate side surface covering portion 4b that is continuous with the lower surface covering portion 4a and is bent along the side surface 2c to cover at least a part of the side surface 2c. In this embodiment, the lower plate side surface covering portion 4b is provided, but may not be provided.
At the corner 1b of the floor panel 1, the lower plate 4 does not extend beyond the lower surface 2b of the core material 2, and is not bent along the corner chamfered core portion 2d of the core material 2.

The length of one side of the upper plate 3 is longer than the sum of the length of one side of the core material 2 and twice the thickness of the core material 2.
The upper plate 3 comprises an upper surface covering portion 3a covering the upper surface 2a of the core material 2, an upper plate side surface covering portion 3b which is folded continuously from the upper surface covering portion 3a along the side surface and covers the side surface 2c, an upper plate side surface extension portion 3c which extends downward continuously from the upper plate side surface covering portion 3b, an upper plate side surface fold portion 3d which is folded continuously from the upper plate side surface extension portion 3c along the upper plate side surface extension portion 3c, and a joining portion 30 which is folded continuously from the upper plate side surface fold portion 3d along the lower surface covering portion 4a and joined to the lower surface of the lower plate 4.

The double folded upper plate side extension 3c and the upper plate side fold 3d form a reinforcing rib 32 that protrudes downward from the outer periphery of the underside of the floor panel 1.

The joint 30 is pressed against and supported by the underside of the lower plate 4 by the upper plate side fold portion 3d, which is folded back along the upper plate side extension portion 3c, thereby forming the joint.
Therefore, the joining strength can be increased compared to a case where the upper plate side covering portion 3b is simply bent and the joining portion is joined to the lower plate.

In addition, if the joint 30 is simply bent from the upper plate side covering portion 3b when joining the lower plate 4, a force is likely to act laterally (from the periphery of the floor panel 1 toward the center) on the underside of the lower plate 4, causing the lower plate 4 to distort and bulge downward. However, because the joint 30 is formed from the reinforcing rib 32, no force acts laterally on the underside of the lower plate 4, and only a pressing force acts from below, making the lower plate 4 less likely to distort and preventing downward bulging. This is particularly effective in cases where the lower plate 4 does not have the lower plate side covering portion 4b.

Furthermore, it is possible to omit or reduce the number of locations where burring or the like is performed to press and deform the joint portion 30 to join it to the core material 2 or the lower plate 4, and distortion of the lower plate 4 can be further suppressed.
The provision of the reinforcing ribs 32 increases the strength of the peripheral portion of the floor panel 1, in particular the resistance to bending.

The joint 30 is folded over (so-called hemming) so that the fold-over piece 30a is folded over further toward the top surface toward the outside of the floor panel 1.

At the corner 1b of the floor panel 1, the upper plate 3 is provided with a rising covering portion 3f which is continuous from the upper surface covering portion 3a and is bent along the rising core portion 2f of the core material 2 to cover the rising core portion 2f, a step covering portion 3e which is continuous from the rising covering portion 3f and is bent along the step core portion 2e to cover the step core portion 2e, a chamfered covering portion 3g which is continuous from the step covering portion 3e and is bent along the chamfered core portion 2d to cover the chamfered core portion 2d, and a corner joint portion 31 which is continuous from the chamfered covering portion 3g and is bent along the underside of the lower plate 4 to be overlapped and joined to the underside of the lower plate 4.

The chamfered portion 20 of the floor panel 1 is composed of the chamfered core portion 2d of the core material 2 and the chamfered covering portion 3g of the upper plate 3, the step portion 21 is composed of the step core portion 2e of the core material 2 and the step covering portion 3e of the upper plate 3, and the rising portion 22 is composed of the rising core portion 2f of the core material 2 and the rising covering portion 3f of the upper plate 3.

As described above, the upper plate 3 and lower plate 4 are formed by bending to cover the areas where the corners of the core material 2 are formed, so the filling rate of the core material 2 between the upper plate 3 and lower plate 4 can be increased, which is particularly effective when manufacturing floor panels 1 by covering an already formed core material 2 such as particle board.

The corner joint 31 is folded back (so-called hemming) in such a way that a fold-back piece 31 a is folded further toward the upper surface side toward the outside of the floor panel 1 .
At both ends (Figure 2) of the corner joint 31 of each corner 1b, in the folded-back portion, a through hole 12 is formed in the upper plate 3, and a through hole 13 corresponding to the through hole 12 is formed in the lower plate 4. A burring pin is driven into the lower portion of the core material 2 from below to deform the upper plate 3 and the lower plate 4, thereby biting into the lower portion of the core material 2 and joining the corner joint 31 to the lower plate 4 (forming a deformed joint) (Figure 4).

The corner joint 31 is joined to the lower plate 4 by pressing the upper plate 3 and the lower plate 4 from below, deforming them, so there is no downward protrusion on the underside of the corner joint 31, and even if the upper part of the stacked floor panel 1 shifts, it will not get caught and the corner joint 31 will not be damaged. In addition, no additional joining tools are required, and the joint can be easily joined.

In addition, the corner joints 31 are deformed when the upper plate 3 and the lower plate 4 are pressed from below, and they bite into the lower part of the core material 2 and are joined to the lower plate 4, so the upper plate 3 and the lower plate 4 are less likely to peel off, making for a strong structure.

Furthermore, the corner joint 31 has a through hole 12, and the upper plate 3 and the lower plate 4 are deformed and joined to the lower plate 4 by being pressed from below the through hole 12, making it easy to position the pressing tool and also facilitating efficient deformation and joining.

The upper plate 3 has a restriction recess 11 formed on the upper surface.
Specifically, on the upper surface of the floor panel 1, at the center positions of four divided areas divided by the vertical and horizontal center lines, a regulating recess 11 capable of engaging with a regulating protrusion 10 formed on the lower surface of the other floor panel 1 is formed. The recess shape of the regulating recess 11 is such that it can accommodate a part of the regulating protrusion 10.

As shown in FIG. 3 , a rear surface 110 of the restricting recess 11 is formed in close contact with a hole 111 provided in the upper surface 2 a of the core material 2 .
Specifically, by pressing from above the upper plate 3 with a pressing tool (not shown) at a position corresponding to the regulating protrusion 10, a regulating recess 11 in the upper plate 3 and a hole 111 in the core material 2 are formed, and the back surface 110 of the regulating recess 11 and the hole 111 in the core material 2 are brought into close contact with each other.

The back surface 110 of the regulating recess 11 is formed in close contact with the hole 111 provided in the upper surface 2a of the core material 2, so the regulating recess 11 is less likely to deform. In addition, the regulating recess 11 and the hole 111 can be formed simultaneously by pressing from above the upper plate 3, and there is no need to align the regulating recess 11 and the hole 111 during manufacturing.

The lower plate 4 has a regulating protrusion 10 on the underside thereof which can engage with a regulating recess 11 of the upper plate 3 of another floor panel 1 .
Specifically, at the center positions of four divided areas on the underside of the floor panel 1, which are divided by vertical and horizontal center lines that correspond to the regulating recesses 11, the lower plate 4 is protruded downward to form regulating protrusions 10.

The protruding length of the regulating convex portion 10 is longer than the height of the reinforcing rib 32 formed by the upper plate side extension portion 3c and the upper plate side fold portion 3d, and is longer than the sum of the height of the reinforcing rib 32 and the depth of the regulating recess 11.
Specifically, the protruding length of the regulating convex portion 10 from the underside of the flat portion of the lower plate 4 is longer than the distance from the underside of the flat portion of the lower plate 4 to the lower end of the reinforcing rib 32, and is further formed to be longer than the height of the reinforcing rib 32 plus the distance from the upper surface of the flat portion of the upper plate 3 to the bottom of the regulating recess 11.

If the protruding length of the regulating convex portion 10 is longer than the height of the reinforcing rib 32, even if the regulating convex portion 10 and the regulating concave portion 11 are not engaged when stacking, the reinforcing rib 32 will not come into contact with the upper surface of the lower floor panel 1, preventing damage to the joint 30 and the reinforcing rib 32.

In addition, if the protruding length of the regulating convex portion 10 is made longer than the sum of the height of the reinforcing rib 32 and the depth of the regulating recess 11, when the regulating convex portion 10 and the regulating recess 11 are engaged and stacked, the reinforcing rib 32 will not come into contact with the upper surface of the lower floor panel 1, preventing damage to the reinforcing rib 32 and the joint 30.

When multiple floor panels 1 are stacked before installation or during transport, the restricting protrusions 10 and restricting recesses 11 of the stacked floor panels 1 engage with each other to restrict movement, so there is no risk of the stacked floor panels 1 shifting.

In addition, even if the overlapping floor panels 1 shift, the joints 30 and reinforcing ribs 32 of the upper plate 3 overlap the underside of the lower plate 4, and the regulating protrusions 10 also protrude from the underside of the lower plate 4, so there is no need to worry about the regulating protrusions 10 hitting the tip surface of the joints 30 of the upper plate 3 and peeling off. The moving joints 30 and reinforcing ribs 32 move over the upper surface of the lower floor panel 1, where there are no regulating protrusions 10, and the joints 30 do not collide with the regulating protrusions 10, so it is possible to prevent the joints 30 from breaking and the upper plate 3 from peeling off from the lower plate 4.

Even when a plurality of floor panels 1 are stacked, the restricting recess 11 will not deform because the back surface 110 is supported in close contact with the upper surface of the hole 111.
Since a plurality of restricting protrusions 10 and a plurality of restricting recesses 11 (four of each in this embodiment) are formed, relative rotation between overlapping floor panels 1 can also be prevented.

The floor panel 1 is manufactured, for example, as follows.
The restricting protrusion 10 is formed on the lower plate 4 by pressing it with a pressing member (not shown).

Next, the lower surface 2b of the core material 2 is covered with the lower surface covering portion 4a of the lower plate 4. The lower surface 2b of the core material 2 and the lower surface covering portion 4a of the lower plate 4 may be bonded together with an adhesive or the like.
The lower plate side surface covering portion 4b of the lower plate 4 is bent along the side surface 2c of the core material 2. A sufficient amount of the core material 2 is present at the corner portion for the bending process.

Next, the upper surface 2a of the core material 2 is covered with the upper surface covering portion 3a of the upper plate 3. The upper surface 2a of the core material 2 and the upper surface covering portion 3a of the upper plate 3 may be bonded together with an adhesive or the like.
The outer peripheral edge of the upper plate 3 is folded back toward the rear surface to form folded back pieces 30a, 31a.

The upper surface covering portion 3a of the upper plate 3 is pressed from above with a pressing tool (not shown) to form the restricting recess 11 in the upper plate 3 and the hole portion 111 in the core material 2.

To form the corner 1b, the portion of the upper plate 3 that forms the corner 1b is pressed from above and bent, and the rising core portion 2f, step core portion 2e, and corner chamfered core portion 2d of the core material 2 are covered with the rising covering portion 3f, step covering portion 3e, and corner chamfered covering portion 3g of the upper plate 3. The rising core portion 2f of the core material 2 and the rising covering portion 3f of the upper plate 3, the step core portion 2e and step covering portion 3e, and the corner chamfered core portion 2d and corner chamfered covering portion 3g may be bonded together with an adhesive or the like.

The rising covering portion 3f of the upper plate 3 is bent along the rising core portion 2f of the core material 2, the stepped covering portion 3e is bent along the stepped core portion 2e, and the chamfered covering portion 3g is bent along the chamfered core portion 2d. Then, the corner joint portion 31, which has been folded over with the folded piece 31a, is bent along the underside covering portion 4a and overlapped on the underside of the lower plate 4. There is sufficient core material 2 at each corner portion due to the folding process.

In addition, the core material 2 is sufficiently present in areas where corners are formed in a plan view of the floor panel 1, such as the area where the side surface 2c of the core material 2 intersects with the corner-reduced core portion 2d and the area where the side surface 2c intersects with the raised core portion 2f.

The corner joint 31 is pressed from below with a pressing tool (not shown) to deform it, a process known as burring, and then joined to the lower plate 4. The through holes 12 in the upper plate 3 and the through holes 13 in the lower plate 4 may be formed simultaneously with the burring process, or may be formed beforehand.

The joining process between the corner joint 31 and the lower plate 4 and the process of forming the regulating recess 11 in the upper plate 3 may be performed in an overlapping manner. By overlapping the joining process between the corner joint 31 and the lower plate 4, which involves pressing from below, and the process of forming the regulating recess 11 in the upper plate 3, which involves pressing from above, the space of the processing machine can be used effectively and the number of steps can be reduced.

To form the edge 1a of the floor panel 1, as shown in Figure 5, the side pressing tool P1 is brought close to the side of the core material 2 to push and bend the part of the upper plate 3 that protrudes from the core material 2, and the end of the upper plate 3 is folded downward, so that the upper plate side covering part 3b of the upper plate 3 covers the side 2c of the core material 2 from outside the lower plate side covering part 4b.

The lower pressing tool P2 is brought close to the lower plate 4 from below and pressed against it, so that the portion extending downward from the upper plate side covering portion 3b is folded inwardly of the floor panel 1.
At this time, by leaving a gap L between the inner surface P1a of the side pressing tool P1 and the side surface P2a of the lower pressing tool P2, the portion extending downward from the upper plate side surface covering portion 3b enters the gap L, and an upper plate side surface extension portion 3c is formed, which extends continuously downward from the upper plate side surface covering portion 3b, and by pushing up with the lower pressing tool P2, the upper plate side surface fold portion 3d is folded back continuously from the upper plate side surface extension portion 3c along the upper plate side surface extension 3c, forming a reinforcing rib 32, and further, the upper end of the upper plate side surface fold portion 3d is folded continuously along the lower surface covering portion 4a, forming a joint 30.

The joint portion 30 is pressed firmly by the lower pressing tool P2 so as to come into close contact with the lower plate 4, and is joined to the lower plate 4 by being pressed and supported from below by the upper plate side fold portion 3d.
If a raised portion P2b is provided in a portion of the lower pressing tool P2 that does not press the joint 30, the raised portion P2b can also suppress the lower plate 4 from bulging downward.

The joining process between the joint 30 and the lower plate 4 and the process of forming the regulating recess 11 in the upper plate 3 may be performed in an overlapping manner. By overlapping the joining process between the joint 30 and the lower plate 4, which involves pressing from below, and the process of forming the regulating recess 11 in the upper plate 3, which involves pressing from above, the space of the processing machine can be used effectively and the number of steps can be reduced.

The process of forming the corners 1b and the process of forming the sides 1a may be performed simultaneously or one after the other. Also, only some of the processes of forming the corners 1b and the process of forming the sides 1a may be overlapped.

As shown in FIGS. 6A and 7, the floor support structure for supporting the floor panels 1 has a plurality of floor panels 1 arranged above a floor slab 5 and supported by floor panel supports 6.
A number of floor panel supports 6 are erected on the floor slab 5, and the corners 1b of the four floor panels 1 are butted together and supported by the floor panel supports 6. A wiring accommodation space 7 for arranging cables, etc. is formed between the floor slab 5 and the laid floor panels 1.

The floor panel support 6 includes a support leg 60 , a support base 61 , a pressure plate 62 , and a lock screw 63 .
The support leg 60 has a threaded shaft 600 and a base 602 that faces the lower end of the threaded shaft 600 and is placed on the floor slab 5 .

The support base 61 includes a cylindrical nut 610 that is screwed onto the upper portion of the screw shaft 600, a base 611 that protrudes from the outer periphery of the cylindrical nut 610, and a receiving base 612 that is attached to the base 611.

By rotating the cylindrical nut 610 on the screw shaft 600, the length of the floor panel support 6 can be adjusted, and the height of the support base 61 can be adjusted. After adjusting the height, it can be fixed in place with a locking screw 616 provided on the cylindrical nut 610.

The receiving base 612 is attached in advance by covering the base 611. The receiving base 612 is made of, for example, synthetic resin, and has a flat surface that is slightly larger than the base 611. The floor panel support 6 is made of, for example, metal, except for the receiving base 612.

As shown in Figures 8 and 9, a nut portion 614 protrudes from the center of the top surface of the receiving base 612, and four partition walls 615 are formed radially from the outer periphery of the nut portion 614, dividing the top surface of the receiving base 612 into four sections.

On the upper surface of the receiving base 612 , accommodation grooves 618 are formed along both side surfaces of each partition wall 615 and the outer circumferential surface of the nut portion 614 .
The depth of the accommodation groove 618 is greater than the protruding length from the lower surface of the lower surface covering portion 4 a to the lower end of the reinforcing rib 32 .

Figure 6B is a cross-sectional view of a key portion of the floor panel support structure showing a portion of the accommodating groove 618 formed along the nut portion 614, and Figure 6C is a cross-sectional view of a key portion of the floor panel support structure showing a portion of the accommodating groove 618 formed along the partition wall 615.
The width of the accommodation groove 618 formed along both side surfaces of the partition wall 615 is wider than the sum of the width of the joint portion 30 and the width of the reinforcing rib 32 (FIG. 6C).
The width of the receiving groove 618 formed along the outer peripheral surface of the nut portion 614 is wider than the distance from the intersection of the lines extending around two adjacent peripheries of the floor panel 1 to the inner end of the corner joint portion 31 (FIG. 6B).

A peripheral wall 617 is formed along the outer peripheral edge of the lower surface of the receiving base 612, and a plurality of hook portions 613 (four in the example shown in the figure) are provided at equal intervals in the circumferential direction on the lower end portion of the inner surface of the peripheral wall 617.
The receiving base 612 is placed on the upper surface of the base 611 and the hook portion 613 of the receiving base 612 is engaged with the lower surface of the base 611 , whereby the receiving base 612 is disposed on the upper portion of the support leg 60 .

The pressure plate 62 has a thickness approximately equal to the depth of the step 21 (the height of the rising portion 22), and the outer shape of the pressure plate 62 is a rectangle that is slightly smaller than the outer shape formed by the step portions 21 of the four floor panels 1.

A screw hole 620 for inserting the lock screw 63 is formed in the center of the pressure plate 62, and a recess 621 for fitting the head of the lock screw 63 is formed on the upper surface around the screw hole 620. In addition, multiple (e.g., four) engagement claws 631 are formed in the circumferential direction on the lower part of the neck of the lock screw 63, which come into contact with the underside of the screw hole 620 and engage with the pressure plate 62.

To construct the floor, as shown in FIG. 6A, a base 602 is fixed onto the floor slab 5 and a number of support legs 60 are erected thereon.
The distance between the central axes of the support legs 60 is set to be approximately equal to the length of one side of the floor panel 1. The length of the support legs 60 is adjusted in advance in accordance with the required height of the wiring accommodation space 7, and the height of the support base 61 is adjusted in advance.

Next, as shown in FIG. 7, on the upper surface of the receiving base 612, the corners 1b of the floor panels 1 are placed on each of the four compartments divided by the partition walls 615, and the four floor panels 1 are arranged with the corners 1b butted together.
As shown in FIGS. 6B and 6C, the reinforcing ribs 32, the joints 30 and the corner joints 31 of the floor panel 1 are received in the receiving grooves 618 of the receiving base 612.

The chamfered corners 20 of the four floor panels 1 form a rectangular through-hole into which the nut portion 614 is placed. The stepped portions 21 of the four butted floor panels 1 have a rectangular outer shape (Figure 7).

Next, as shown in FIGS. 6A and 7, a pressure plate 62 is fitted onto the step portion 21 having a rectangular external shape.
Since the rising portion 22 is inclined such that the upper portion is away from the step portion 21, the pressure plate 62 is guided by the rising portion 22 and easily fitted onto the step portion 21.

Thereafter, the lock screw 63 is screwed into the nut portion 614 through the screw hole 620 of the fitted pressure plate 62. The engagement claw 631 passes through the screw hole 620, the lock screw 63 engages with the pressure plate 62, and the pressure plate 62 presses the step portion 21. As a result, the corner portions 1b of the four floor panels 1 are clamped between the support base 61 and the pressure plate 62, and the panels are stably laid down.
Alternatively, the head portion of the lock screw 63 may be first inserted into the screw hole 620 of the pressure plate 62 to engage the engagement claw 631 with the screw hole 620 , and then the lock screw 63 may be screwed into the nut portion 614 .

The rising portion 22 is linear in plan view and is fitted with one side of the pressure plate 62 that is aligned with the corner 1b of the other floor panel 1 and presses against the step portion 21. Therefore, when the lock screw 63 is screwed in, the pressure plate 62 is restricted and does not spin freely, so that the floor panel 1 can be securely supported.

As shown in Figures 6B and 6C, the receiving base 612's storage groove 618 has a width and depth sufficient to accommodate the reinforcing ribs 32, joints 30, and corner joints 31 of the floor panel 1, so that the flat underside covering portion 4a of the floor panel 1 rests on the upper surface 612a of the receiving base 612 where the receiving groove 618 is not formed, and the floor panel 1 does not rattle.

In addition, the accommodation groove 618 engages with the reinforcing rib 32, the joint 30, and the corner joint 31, suppressing horizontal movement of the floor panel 1.

Furthermore, below the step covering portion 3e of the upper plate 3 that constitutes the step 21 is the step core portion 2e of the core material 2, and further below that are the corner joint portion 31 of the upper plate 3 and the lower plate 4, i.e., the core material 2 is present between the upper plate 3 and the lower plate 4 in the portion of the step 21 that is pressed by the pressure plate 62 and supported by the support base 61 and held in a sandwiched manner, increasing strength and improving deformation performance. In other words, as the core material 2 is built into the corner 1b of the floor panel 1 that is sandwiched between the support base 61 and the pressure plate 62, it is strong and does not easily deform even when a heavy load is applied.
In addition, at the corners 1b of the floor panel 1, the upper plate 3 is joined to the lower plate 4 by burring, so that it is unlikely to peel off even when subjected to a force in the shear direction.

The floor panel 1 may be supported from below at appropriate points, except for the corners 1b, by beams erected on the floor slab 5.

In addition, the pressure plate 62 has approximately the same thickness as the rising portion 22 of the step portion 21, and a recess 621 for fitting the head of the lock screw 63 is formed around the screw hole 620 of the pressure plate 62, so that the upper surface of the floor is finished smoothly.
Finally, a finishing material such as a carpet is placed on the upper surface of the laid floor panel 1.

Second Embodiment
A second embodiment of the present invention will be described below with reference to Figures 10 to 12. Note that a description of the same parts as in the first embodiment will be omitted, and differences will be mainly described.

In this embodiment, as shown in Figures 10 and 11, a substantially rectangular cutout portion 14 is formed in the center of a pair of opposing sides of the floor panel 1. The cutout portion 14 is used for pulling out the cable wired in the wiring storage space 7 above the floor panel 1, etc.

A notched step 15 is formed on the upper surface along the periphery of the notched portion 14 .
The cutout step 15 is formed about 4 to 5 mm lower than the upper surface of the floor panel 1 .
A notched rising portion 16 that is continuous with the notched step portion 15 is formed on the upper surface of the floor panel 1 .

As shown in Figure 12, the core material 2 is provided with a notched core portion 2g cut out in a rectangular shape corresponding to the notched portion 14, a notched step core portion 2h formed continuously from the notched core portion 2g, and a notched rise core portion 2i continuing from the notched step core portion 2h and rising parallel to the notched core portion 2g toward the upper surface 2a.
The portion of the lower plate 4 corresponding to the cutout portion 14 is cut out to be slightly larger than the cutout portion 14 and is formed so as not to cover the cutout core portion 2g.

The upper plate 3 is cut out in a rectangular shape corresponding to the cutout portion 14 and smaller than the cutout portion 14 .
The portion protruding from the cutout portion 14 of the upper plate 3 is formed by bending continuously from the upper surface covering portion 3a to form a notch rise covering portion 3h that covers the notch rise core portion 2i of the core material 2, a notch step covering portion 3i that is bent continuously from the notch rise covering portion 3h to cover the notch step core portion 2h, a notch covering portion 3j that is bent continuously from the notch step covering portion 3i to cover the notch core portion 2g, and a notch joint portion 33 that is bent continuously from the notch covering portion 3j along the underside of the lower plate 4 and is overlapped and joined to the underside of the lower plate 4.

The tip of the notched joint 33 is further folded over (so-called hemming) to fold the folded piece 33a onto the upper surface side.

At both ends of each side of the cutout 14 and at one location approximately in the middle of each side, the folded-back portion of the cutout joint 33 has a through hole 12 formed in the upper plate 3 and a through hole 13 corresponding to the through hole 12 formed in the lower plate 4. A burring pin is driven into the lower portion of the core material 2 from below to deform the upper plate 3 and the lower plate 4, and the corner joint 31 is joined to the lower plate 4.

At both circumferential ends of the cutout 14, the end of the cutout joint 33 and the end of the joint 30 of the side portion 1a facing the cutout 14 are overlapped, and the through hole 12 of the cutout joint 33 is aligned with the through hole 12 of the joint 30 to perform burring (forming a deformed joint).

[Third embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to Fig. 13. Note that a description of the same parts as in the first and second embodiments will be omitted, and differences will be mainly described.

This embodiment differs in that burring is performed not only on both ends of the corner joint 31 but also on both ends in the longitudinal direction of the joint 30 .
A through hole 12 is formed at both longitudinal ends of the joint 30, and a burring pin is driven from below into this through hole 12 and the through hole 13 of the lower plate to deform the joint, thereby joining both ends of the joint 30 of the upper plate 3 to the lower plate 4 and core material 2 (forming a deformed joint).

The reinforcing ribs 32 may or may not be formed at both longitudinal ends of the joint 30 to be burred.

[Fourth embodiment]
Hereinafter, the fourth embodiment of the present invention will be described with reference to Fig. 14. Note that a description of the same parts as those of the first to third embodiments will be omitted, and differences will be mainly described.

This embodiment has a configuration similar to that of the second embodiment, but differs in that, as shown in FIG. 14, burring is performed not only on both ends of the corner joints 31 but also on both ends of the joints 30 of the side portions 1a, and the joints 30 are deformed and joined to the lower plate 4 (forming a deformed joint).

[Fifth embodiment]
Hereinafter, the fifth embodiment of the present invention will be described with reference to Fig. 15. Note that a description of the same parts as those of the first to fourth embodiments will be omitted, and differences will be mainly described.

This embodiment has a configuration similar to that of the third embodiment, but differs in that, as shown in FIG. 15 , in addition to both ends of the corner joint 31 and both ends of the joint 30, burring is also performed at the longitudinal center of the joint 30 of the side portion 1 a.
A burring pin is driven from below into the through hole 12 of the joint 30 at the longitudinal center of the side portion 1a and into the through hole 13 of the lower plate 4, and the area around the through holes 12, 13 is deformed to join the joint 30 to the lower plate 4 (forming a deformed joint).

Sixth embodiment
Hereinafter, the sixth embodiment of the present invention will be described with reference to Fig. 16. Note that a description of the same parts as in the first to fifth embodiments will be omitted, and differences will be mainly described.

The sixth embodiment is similar to the fourth embodiment, but differs in that, as shown in FIG. 16, burring is performed on the center of the joint 30 in the longitudinal direction on a pair of opposing peripheries of the floor panel 1 where the cutout portion 14 is not formed, and the joint 30 of the upper plate 3 is deformed and joined to the lower plate 4 (forming a deformed joint).

[Other Modifications]
The present invention is not limited to the above-mentioned embodiment, and may also include the following, for example.

In this embodiment, the core material 2 is a wood material such as particle board, but it may also be lightweight concrete, etc.

In this embodiment, the floor panel 1 is rectangular, but it can also be other polygonal shapes, and the number of panels laid with the corners butted together will vary depending on the shape.

The structure of the floor panel supports 6 that support the corners of the floor panels 1 arranged abutting each other is not limited to that described in this embodiment.
As an example, the pressure plate may be snapped onto the upper end of the support leg 60 .

In this embodiment, through holes 12 are provided in the joints 30, corner joints 31, or notch joints 33 of the upper plate 3, and through holes 13 are provided in the lower plate 4, but this is not limited to the above. It is also possible to not provide through holes in either the upper plate 3 or the lower plate 4, and to deform the plates while forming through holes using a pressing tool to join them, or to provide a through hole in either the upper plate 2 or the lower plate 3, and then deform the plates to join them.

In this embodiment, the protruding length of the regulating protrusion 10 is longer than the sum of the thickness of the joint 30 and the depth of the regulating recess 11, but this is not limited to this. As long as the protruding length of the regulating protrusion 30 is longer than the thickness of the joint 30, it may be shorter than the sum of the thickness of the joint 30 and the depth of the regulating recess 11.

In this embodiment, the corner joint 31 and the notch joint 33 are joined to the lower plate 4 by burring processing, but they can also be joined to the lower plate 4 by pressing and deforming them with a lower pressing tool without driving in a burring pin.
In this case, reinforcing ribs 32 may be formed on the outer periphery of each of the corner joints 31 and the notch joints 33 in the same manner as the side portions.

In this embodiment, the reinforcing rib 32, the joint 30, and the corner joint 31 are accommodated in the accommodation groove 618, but it may be possible to accommodate only the reinforcing rib 32.

In this embodiment, the reinforcing ribs 32 are not formed at the corners 1b of the floor panel 1, but they may be used in conjunction with a process such as burring where the upper plate 3 and lower plate 4 are joined by pressing and deforming them.

The technical aspects of any of the embodiments, including the modified examples, may be applied to other embodiments to serve as examples.

LIST OF REFERENCE NUMERALS 1 floor panel 1a side 1b corner 10 restricting protrusion 11 restricting recess 110 back surface 111 hole 12, 13 through hole 14 notch 15 notch step 16 notch rising portion 2 core material 2a upper surface 2b lower surface 2c side surface 2d corner chamfered core 2e step core 2f rising core 2g notch core 2h notch step core 2i notch rising core 20 corner chamfered portion 21 step 22 rising portion 3 upper plate 3a upper surface covering portion 3b upper plate side covering portion 3c upper plate side extension portion 3d upper plate side folded portion 3e step covering portion 3f rising covering portion 3g corner chamfered covering portion 3h notch rising covering portion 3i Notch step covering portion 3j Notch covering portion 30 Joint portion 31 Corner joint portion 32 Reinforcement rib 33 Notch joint portion 4 Lower plate 4a Lower surface covering portion 4b Lower plate side surface covering portion 5 Floor slab 6 Floor panel support 60 Support leg 600 Screw shaft 602 Base 61 Support base 610 Cylindrical nut 611 Pedestal 612 Receiving base 613 Hook portion 614 Nut portion 615 Partition wall 616 Set screw 617 Peripheral wall 618 Storage groove 62 Pressing plate 620 Screw hole 621 Recess 63 Lock screw 631 Engagement claw 7 Wiring storage space P1 Side pressing tool P2 Lower pressing tool

Claims (10)

1. A floor panel comprising a core material, an upper plate covering an upper surface of the core material, and a lower plate covering a lower surface of the core material,
   The core material has a side surface that rises vertically from a lower surface of the core material,
   The lower plate has a lower surface covering portion that covers a lower surface of the core material,
   A floor panel characterized in that the upper plate comprises an upper surface covering portion covering an upper surface of the core material, an upper plate side surface covering portion which is continuous with the upper surface covering portion and folded along the side surface to cover the side surface, an upper plate side surface extension portion which extends downwardly continuous with the upper plate side surface covering portion, an upper plate side surface fold portion which is continuous with the upper plate side surface extension portion and folded back along the upper plate side surface extension portion, and a joint which is continuous with the upper plate side surface fold portion and folded along the lower surface covering portion to be joined to the lower surface of the lower plate.
2. The upper plate has a restriction recess formed on an upper surface of the upper plate,
   the lower plate has a restricting protrusion on a lower surface thereof that is engageable with the restricting recess,
   The floor panel according to claim 1, characterized in that the protruding length of the regulating protrusion from the lower surface of the lower plate is longer than the height of a reinforcing rib formed by the upper plate side extension portion and the upper plate side folded portion.
3. The floor panel according to claim 2 , wherein a protruding length of the regulating protrusion from the lower surface of the lower plate is longer than a sum of a height of the reinforcing rib and a depth of the regulating recess.
4. The floor panel according to any one of claims 1 to 3, characterized in that the joint has a deformed joint that is deformed by pressing the upper plate and the lower plate from below with a pressing tool and is joined to the lower plate.
5. The floor panel according to any one of claims 1 to 3, characterized in that the joint has a deformed joint that is deformed by pressing the upper plate and the lower plate from below with a pressing tool, and that bites into the lower part of the core material and is joined to the lower plate.
6. The floor panel according to any one of claims 1 to 3, characterized in that the joint has a through hole, and is deformed by pressing the upper plate and the lower plate from below the through hole with a pressing tool, and has a deformed joint that bites into the lower part of the core material and is joined to the lower plate.
7. A floor panel support structure in which a floor panel including a core material, an upper plate covering an upper surface of the core material, and a lower plate covering a lower surface of the core material is supported by a floor panel support,
   The floor panel is
   The core material has a side surface that rises vertically from a lower surface of the core material,
   The lower plate has a lower surface covering portion that covers a lower surface of the core material,
   The upper plate includes an upper surface covering portion that covers the upper surface of the core material, an upper plate side surface covering portion that is continuous with the upper surface covering portion and folded along the side surface to cover the side surface, an upper plate side surface extension portion that is continuous with the upper plate side surface covering portion and extends downward, an upper plate side surface fold portion that is continuous with the upper plate side surface extension portion and folded back along the upper plate side surface extension portion, and a joining portion that is continuous with the upper plate side surface fold portion and folded along the lower surface covering portion to be joined to the lower surface of the lower plate,
   The floor panel support includes:
   A support on which the floor panel is placed,
   The cradle has a receiving groove,
   A floor panel support structure, characterized in that the upper plate side extension portion and the upper plate side folded portion are accommodated in the accommodation groove.
8. The floor panel support structure according to claim 7, wherein the joint portion is accommodated in the accommodation groove.
9. A floor panel support for supporting a floor panel including a core material, an upper plate covering an upper surface of the core material, and a lower plate covering a lower surface of the core material,
   The floor panel is
   The core material has a side surface that rises vertically from a lower surface of the core material,
   The lower plate has a lower surface covering portion that covers a lower surface of the core material,
   The upper plate includes an upper surface covering portion that covers the upper surface of the core material, an upper plate side surface covering portion that is continuous with the upper surface covering portion and folded along the side surface to cover the side surface, an upper plate side surface extension portion that is continuous with the upper plate side surface covering portion and extends downward, an upper plate side surface fold portion that is continuous with the upper plate side surface extension portion and folded back along the upper plate side surface extension portion, and a joining portion that is continuous with the upper plate side surface fold portion and folded along the lower surface covering portion to be joined to the lower surface of the lower plate,
   The floor panel support includes:
   A support on which the floor panel is placed,
   A floor panel support device characterized in that the receiving base has an accommodation groove capable of accommodating the upper panel side extension portion and the upper panel side folded portion.
10. The floor panel support device according to claim 9, characterized in that the accommodation groove is further capable of accommodating the joint.

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