Double floor structure

Abstract

To provide a double floor structure capable of suppressing a decrease in the heat insulation properties of a floor when the propagation of sound accompanying vibration of a floor base material is reduced.SOLUTION: A double floor structure 11 includes a floor material 12 placed on a base 91 at a distance from a wall body 92, and an outer peripheral heat insulation structure 13 placed along the outer periphery of the floor material 12. The outer peripheral heat insulation structure 13 has breathability. The floor material 12 includes a floor substrate 21 and an outer peripheral support member 22 that supports the outer peripheral end portion that is the outermost periphery of the floor substrate 21. The outer peripheral support member 22 has an edge joist member 23 on which the floor substrate 21 is placed. The edge joist member 23 includes multiple edge joist members 23 that are adjacent to each other along the outermost periphery of the floor substrate 21 and arranged at a distance from each other. The outer peripheral heat insulation structure 13 includes a plurality of edge joist heat insulation portions 31 each arranged between each of the edge joist members 23 and the wall body 92 in plan view, and an intermediate heat insulation portion 32 disposed to connect the plurality of edge joist heat insulation portions 31.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a double floor structure. [Background technology]

[0002] Conventionally, a double floor structure is known as a type of floor structure that is installed on a base such as a floor slab (see Patent Document 1). The floor material that constitutes the double floor structure has a floor base material and a support member that supports the floor base material while being spaced apart from the base material. This type of double floor structure has a space between the base material and the floor base material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-162513 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the double floor structure as described above, a gap may be provided between the outermost periphery of the floor material and the wall body. By providing a gap between the outermost periphery of the floor material and the wall body in this way, it is possible to suppress the pressure change of the air layer in the space between the floor base material constituting the floor material and the base. This makes it possible to reduce the propagation of sound caused by the vibration of the floor base material. However, air in the space above and below the floor base material moves through the gap between the floor material and the wall body, which may make it difficult to ensure the insulation of the floor. In other words, although providing a gap between the floor material and the wall body is advantageous in terms of reducing the propagation of sound caused by the vibration of the floor base material, there is a risk that it may be difficult to ensure the insulation of the floor.

[0005] The present invention has been made in consideration of these circumstances, and its purpose is to provide a double floor structure that can suppress the deterioration of the insulation properties of the floor when reducing the propagation of sound associated with vibration of the floor base material. [Means for solving the problem]

[0006] We will now explain various aspects of the double floor structure that solves the above problems. The double floor structure of aspect 1 is a double floor structure that is arranged along a wall on a base, and comprises a floor material that is arranged at a distance from the wall, and a breathable peripheral insulation structure that is arranged along the outer periphery of the floor material, wherein the floor material has a floor base material and a peripheral support member that supports the outer periphery end portion that is the outermost periphery of the floor base material, and the peripheral support member has an edge joist member on which the floor base material is placed and an outer periphery support leg that supports the edge joist member at a distance from the base material, and the edge joist member includes a plurality of edge joist members that are adjacent to each other along the outermost periphery of the floor base material and arranged at a distance from each other, and the peripheral insulation structure has a plurality of edge joist insulation sections that are arranged between each of the plurality of edge joist members and the wall in a planar view, and an intermediate insulation section that is arranged to connect the plurality of edge joist insulation sections.

[0007] According to this configuration, the peripheral insulation structure provided as described above can ensure insulation in the gap between the floor material and the wall body. In addition, since the peripheral insulation structure has air permeability, it can adjust the air pressure in the space below the floor base material.

[0008] In the double floor structure of aspect 2, in aspect 1, the outermost periphery of the floor base material has a straight portion and a curved portion in a planar view, and the peripheral insulation structure comprises a first insulation material, a second insulation material, and a third insulation material arranged separately in order along the same straight portion, the first insulation material and the third insulation material are respectively arranged between the multiple edge joist members and the wall body adjacent to each other in a planar view, the second insulation material has a first end and a second end which are both ends in a direction along the straight portion and is arranged so as to connect the first insulation material and the third insulation material, the lower surface of the first end is arranged so as to overlap the upper surface of the first insulation material, and the lower surface of the second end is arranged so as to overlap the upper surface of the third insulation material.

[0009] According to this configuration, by configuring the peripheral insulation structure with the first insulation material, the second insulation material, and the third insulation material arranged separately, it becomes possible to, for example, partially replace the insulation materials. At this time, since both ends of the second insulation material are arranged as described above, it is possible to improve the insulation properties of the connection parts between the first insulation material and the second insulation material and the connection parts between the second insulation material and the third insulation material.

[0010] The double floor structure of the third aspect may be the same as the first or second aspect, but further includes a lower insulation structure provided on the underside of the floor base material, and the lower insulation structure may include a breathable insulation layer. This configuration improves the insulation of the floor material.

[0011] In the double floor structure of the fourth aspect, in the third aspect, the lower insulation structure may not be disposed between the two adjacent edge joists along the outermost periphery of the floor base material, and a space may be provided between them. With this configuration, the space can further enhance the function of adjusting the air pressure in the space below the floor base material. Effect of the Invention

[0012] The present invention exhibits the effect of being able to suppress a decrease in the thermal insulation properties of a floor when the propagation of sound associated with the vibration of a floor base material is reduced. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view showing a double floor structure of an embodiment. [Diagram 2] FIG. 2 is an enlarged perspective view of a portion of the double floor structure. [Diagram 3] FIG. 3 is a plan view showing a double floor structure. [Figure 4] FIG. 4 is a bottom view showing the double floor structure. [Diagram 5] FIG. 5 is an enlarged bottom view showing a portion of the double floor structure. [Figure 6] FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. [Figure 7]FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. [Figure 8] FIG. 8 is an enlarged bottom view showing a portion of the double floor structure. [Figure 9] FIG. 9 is an enlarged side view showing a portion of the double floor structure. [Figure 10] FIG. 10 is an enlarged side view showing a portion of the double floor structure of the modified example. [Figure 11] FIG. 11 is an enlarged side view showing a portion of the double floor structure of the modified example. [Figure 12] FIG. 12 is an enlarged bottom view showing a portion of the double floor structure of the modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of a double floor structure will be described with reference to the drawings. In the drawings, for the sake of convenience, some of the configuration may be shown in an exaggerated or simplified manner. <Overall structure of double floor structure> As shown in FIG. 1, FIG. 6, and FIG. 7, the double floor structure 11 is provided on a base 91 along a wall 92. The base 91 may be, for example, a floor slab made of concrete. The double floor structure 11 includes a floor material 12 arranged apart from the wall 92, and a peripheral insulation structure 13 arranged along the periphery of the floor material 12. The double floor structure 11 of this embodiment further includes a lower insulation structure 14. The X-axis of the XYZ axis in the drawings represents the horizontal direction along one side of the floor material 12, the Y-axis represents the horizontal direction perpendicular to the X-axis, and the Z-axis represents the upward direction perpendicular to the XY plane. In addition, the base 91 and the wall 92 may be omitted in the drawings.

[0015] <Flooring> As shown in Figures 1 to 4, the flooring material 12 has a floor base material 21 and an outer peripheral support member 22 that supports the outer peripheral end portion, which is the outermost periphery of the floor base material 21. As shown in Figure 3, the outermost periphery of the floor base material 21 has a straight portion 21a and a curved portion 21b in a plan view. Examples of the shape of the floor base material 21 in a plan view include a quadrilateral shape such as a rectangular rectangle or a square. In the case of a floor base material 21 that is quadrilateral in a plan view, it has four straight portions 21a and four curved portions 21b.

[0016] Examples of materials for the floor base material 21 include wood-based materials. Examples of wood-based materials include particle board, structural plywood, and laminated lumber. The floor base material 21 can be formed by arranging a plurality of floor base materials 21, for example.

[0017] As shown in Figures 2, 6, and 7, the peripheral support member 22 has an edge joist member 23 on which the floor base material 21 is placed, and a peripheral support leg 24 that supports the edge joist member 23 at a distance from the base 91. The edge joist member 23 has a longitudinal direction that extends along the straight portion 21a of the floor base material 21. The edge joist member 23 includes a plurality of edge joist members 23 that are adjacent to each other along the outermost periphery of the floor base material 21 and spaced apart from each other. The edge joist member 23 of this embodiment includes two edge joist members 23 that are adjacent to each other along the same straight portion 21a and spaced apart from each other.

[0018] As shown in FIG. 6 and FIG. 7, the outer peripheral support leg 24 has an outer peripheral support tip portion 24a that contacts the base 91, and an outer peripheral support connecting portion 24b that connects the outer peripheral support tip portion 24a and the edge joist member 23. Examples of the material of the outer peripheral support tip portion 24a include rubber-based materials. Examples of the rubber-based materials include natural rubber, polyisoprene rubber, styrene-butadiene rubber, polybutadiene rubber, nitrile rubber, butyl rubber, ethylene propylene rubber, urethane rubber, and silicone rubber. One type of rubber-based material may be used, or two or more types may be used. The rubber-based material may contain reinforcing materials such as fillers and additives such as anti-aging agents. The outer peripheral support connecting portion 24b has, for example, a metal shaft-shaped member.

[0019] As shown in FIG. 4 and FIG. 9, the flooring material 12 has an inner support leg 25 that supports the inner side of the outer peripheral end of the floor base material 21. The inner support leg 25 has an inner support tip portion 25a and an inner support connecting portion 25b that connects the inner support tip portion 25a and the floor base material 21. The inner support tip portion 25a can be made of, for example, a rubber-based material, similar to the outer peripheral support tip portion 24a. The inner support connecting portion 25b may have a shaft-shaped member and a support base portion that connects the shaft-shaped member and the floor base material 21. The support base portion is made of, for example, a wood material. The floor base material 21 can be fixed to the support base portion of the inner support leg 25 by mechanical fixing means such as screws and nails, an adhesive layer, an adhesive layer, or the like. The support base portion of the inner support leg 25 can be arranged so as to connect a plurality of adjacent floor base materials 21. The number of the inner support legs 25 may be one or more.

[0020] <Periphery heat insulation structure> As shown in Figures 2, 6, and 7, the peripheral insulation structure 13 has a plurality of edge joist insulation sections 31 and intermediate insulation sections 32. The plurality of edge joist insulation sections 31 are provided between the wall body 92 and each of a plurality of edge joist members 23 that are adjacent to each other and spaced apart from each other along the outermost periphery of the floor base material 21 in a plan view. The intermediate insulation section 32 is provided so as to connect the plurality of edge joist insulation sections 31. The peripheral insulation structure 13 of this embodiment has four intermediate insulation sections 32 arranged corresponding to each straight portion 21a.

[0021] 2 and 8, the peripheral insulation structure 13 includes a first insulation material A1, a second insulation material A2, and a third insulation material A3 that are arranged separately in order along the same straight line portion 21a of the floor substrate 21. In the peripheral insulation structure 13 of this embodiment, the insulation structure having the first insulation material A1, the second insulation material A2, and the third insulation material A3 is provided at each position along four different straight line portions 21a.

[0022] The first insulation material A1 and the third insulation material A3 are respectively disposed between two adjacent edge joist members 23 and the wall body 92 in a plan view. That is, as shown in FIG. 2, the first insulation material A1 is disposed between the first edge joist member 23a and the wall body 92 in a plan view. Also, the third insulation material A3 is disposed between the second edge joist member 23b and the wall body 92 in a plan view. The first edge joist member 23a and the second edge joist member 23b are disposed adjacent to each other along the straight portion 21a. The first insulation material A1 and the second insulation material A2 constitute an edge joist insulation section 31.

[0023] As shown in Figures 2 and 8, the second insulating material A2 is arranged to connect the first insulating material A1 and the third insulating material A3. The second insulating material A2 has a first end A2a and a second end A2b, which are both ends in the direction along the straight portion 21a. The lower surface of the first end A2a of the second insulating material A2 is arranged to overlap the upper surface of the first insulating material A1. The lower surface of the second end A2b of the second insulating material A2 is arranged to overlap the upper surface of the third insulating material A3.

[0024] More specifically, the first end A2a is disposed between the edge joist member 23 and the wall body 92 in a plan view. That is, the first end A2a constitutes a part of the edge joist insulation part 31. The first end A2a is disposed between the floor base material 21 and the wall body 92 in a vertical cross-sectional view.

[0025] The second end A2b is disposed between the edge joist member 23 and the wall body 92 in a plan view. That is, the second end A2b constitutes a part of the edge joist insulation part 31. The second end A2b is disposed between the floor base material 21 and the wall body 92 in a vertical cross-sectional view.

[0026] In the second insulating material A2, an intermediate portion A2c between the first end portion A2a and the second end portion A2b constitutes an intermediate insulating portion 32. As shown in Fig. 5, the peripheral insulation structure 13 includes a fourth insulation material A4 that is arranged corresponding to the curved portion 21b of the floor base material 21. In this way, in the edge joist insulation section 31, a part along the curved portion 21b of the floor base material 21 may be composed of the fourth insulation material A4 that is separate from the first insulation material A1 and the third insulation material A3.

[0027] The peripheral insulation structure 13 has breathability. The first insulation material A1, the second insulation material A2, the third insulation material A3, and the fourth insulation material A4 of the peripheral insulation structure 13 can be made of, for example, a breathable fiber-based material. An example of the fiber-based material is a felt material. An example of the felt material is a felt material containing synthetic fibers having thermoplasticity, such as polyester fibers (PET fibers). The density of the fiber-based material is, for example, 10,000 g / m 3 More than 100000g / m 3 It is within the following range.

[0028] <Lower heat insulation structure> As shown in Figures 2, 4, 6, and 7, the lower insulation structure 14 is provided below the floor substrate 21. The lower insulation structure 14 is disposed at a distance from the base 91. The lower insulation structure 14 includes a plurality of lower insulation materials 41. The lower insulation structure 14 (lower insulation material 41) includes an insulating layer 41a having breathability. The insulating layer 41a can be made of, for example, a breathable fiber-based material, similar to the first insulation material A1 of the peripheral insulation structure 13. The lower insulation structure 14 of this embodiment further includes a resin sheet 41b laminated on the insulating layer 41a.

[0029] The resin sheet 41b is laminated on the lower surface of the heat insulating layer 41a, which is the side opposite to the floor base material 21. The resin sheet 41b can be bonded to the heat insulating layer 41a, for example, by a heat fusion layer (not shown) provided between the heat insulating layer 41a and the resin sheet 41b. Examples of the resin material of the resin sheet 41b include high-density polyethylene, low-density polyethylene, linear low-density polyethylene, polypropylene, etc. The layer structure of the resin sheet 41b may be a single-layer structure or a multi-layer structure. The thickness of the resin sheet 41b is, for example, in the range of 10 μm or more and 1000 μm or less.

[0030] As shown in Figures 2, 8, and 9, the lower insulation structure 14 is not disposed between two adjacent edge joists 23 along the outermost periphery of the floor base material 21. That is, as shown in Figures 8 and 9, a space SP1 is provided between two adjacent edge joists 23 along the outermost periphery of the floor base material 21.

[0031] <How to construct a double floor structure> Next, an example of a method for constructing the double floor structure 11 will be described. To construct the above-mentioned double floor structure 11, first, a plurality of peripheral support members 22 are placed on a base 91. In addition, the first insulation material A1 and the third insulation material A3, which become the edge joist insulation portion 31, are placed along the wall body 92. At this time, it is preferable that the first insulation material A1 and the third insulation material A3 are attached in advance to the edge joist member 23 of the peripheral support member 22. This allows the peripheral support member 22 and the first insulation material A1 and the third insulation material A3 to be placed simultaneously.

[0032] Next, the inner support leg 25, the lower insulation material 41, and the floor base material 21 are arranged. In detail, after the lower insulation material 41 is attached to the floor base material 21, the floor base material 21 is attached to the edge joist member 23 and the inner support leg 25.

[0033] Next, the second insulating material A2 is arranged along the wall body 92 so as to be connected to the first insulating material A1 and the third insulating material A3. The second insulating material A2 can be attached, for example, to the outer surface of the floor base material 21, the wall body 92, or the like.

[0034] Next, the fourth insulating material A4 is disposed between the edge joist member 23 and the wall body 92. The fourth insulating material A4 can be attached to the wall body 92, the edge joist member 23, etc., for example. Each member constituting the double floor structure 11 can be attached using, for example, an adhesive, an adhesive tape, etc. Each member constituting the double floor structure 11 may also be attached using mechanical fixing means such as screws, nails, etc.

[0035] In the double floor structure 11 arranged in this manner, a floor finishing material (not shown) can be placed on the floor substrate 21. Examples of floor finishing materials include flooring, cork boards, tiles, tatami mats, carpets, resin sheets, rubber sheets, and the like.

[0036] <Actions and Effects of the Present Embodiment> Next, the operation and effects of this embodiment will be described. (1) The double floor structure 11 is provided on a base 91 along a wall 92. The double floor structure 11 includes a floor material 12 arranged at a distance from the wall 92, and a breathable peripheral insulation structure 13 arranged along the periphery of the floor material 12. The floor material 12 has a floor base material 21 and a peripheral support member 22 that supports the outer peripheral end portion that is the outermost periphery of the floor base material 21. The peripheral support member 22 has an edge joist member 23 on which the floor base material 21 is placed, and a peripheral support leg 24 that supports the edge joist member 23 at a distance from the base 91. The edge joist member 23 includes a plurality of edge joist members 23 that are adjacent to each other along the outermost periphery of the floor base material 21 and are arranged at a distance from each other. The peripheral insulation structure 13 has a plurality of edge joist insulation parts 31 that are provided between each of the plurality of edge joist members 23 and the wall 92 in a plan view. The peripheral insulation structure 13 has an intermediate insulation section 32 that is arranged to connect multiple edge joist insulation sections 31.

[0037] According to this configuration, the peripheral insulation structure 13 provided as described above can ensure insulation in the gap between the floor material 12 and the wall body 92. In addition, since the peripheral insulation structure 13 has air permeability, it can adjust the air pressure in the space below the floor base material 21. Therefore, it is possible to suppress a decrease in the insulation properties of the floor when the propagation of sound associated with the vibration of the floor base material 21 is reduced.

[0038] (2) The outermost periphery of the floor base material 21 has a straight portion 21a and a curved portion 21b in plan view. The outer periphery insulation structure 13 includes a first insulation material A1, a second insulation material A2, and a third insulation material A3 that are arranged separately in order along the same straight portion 21a. The first insulation material A1 and the third insulation material A3 are respectively arranged between two adjacent edge joist members 23 and the wall body 92 in plan view. The second insulation material A2 has a first end A2a and a second end A2b, which are both ends in the direction along the straight portion 21a of the floor base material 21. The second insulation material A2 is arranged to connect the first insulation material A1 and the third insulation material A3. The lower surface of the first end A2a is arranged so as to overlap the upper surface of the first insulation material A1. The lower surface of the second end A2b is arranged so as to overlap the upper surface of the third insulation material A3.

[0039] In this case, by configuring the peripheral insulation structure 13 with the first insulation material A1, the second insulation material A2, and the third insulation material A3 arranged separately, it becomes possible to, for example, partially replace the insulation materials. At this time, since both ends of the second insulation material A2 are arranged as described above, it is possible to improve the insulation properties of the connection parts between the first insulation material A1 and the second insulation material A2 and the connection parts between the second insulation material A2 and the third insulation material A3.

[0040] (3) The double floor structure 11 has a lower insulation structure 14 provided under the floor base material 21. The lower insulation structure 14 has an insulating layer 41a having air permeability. In this case, for example, it is possible to improve the thermal insulation of the floor material 12.

[0041] (4) Between two adjacent edge joists 23 along the outermost periphery of the floor base material 21, a space SP1 is provided without disposing the lower insulation structure 14. In this case, the space SP1 provided between the multiple edge joists 23 can further improve the air pressure adjustment function in the space below the floor base material 21. Therefore, it is possible to further reduce the propagation of sound caused by the vibration of the floor base material 21.

[0042] (5) The lower insulation structure 14 further includes a resin sheet 41b laminated on the lower surface of the insulation layer 41a. In this case, the resin sheet 41b can, for example, prevent moisture from the base 91, etc. from migrating to the insulation layer 41a of the lower insulation structure 14. This makes it possible to keep the insulation layer 41a of the lower insulation structure 14 in a good condition.

[0043] <Example of change> The above embodiment may be modified as follows: The above embodiment and the following modifications may be combined with each other to the extent that no technical contradiction occurs.

[0044] By disposing the lower insulation structure 14 between two adjacent edge joists 23, the space SP1 can be omitted. The lower heat insulating material 41 constituting the lower heat insulating structure 14 has a resin sheet 41b, but this resin sheet 41b may be omitted.

[0045] The insulating layer 41a of the lower insulating structure 14 has air permeability, but this insulating layer 41a can be changed to an insulating layer that does not have air permeability. The lower heat insulating structure 14 may be omitted.

[0046] In the peripheral insulation structure 13, the underside of the first end A2a of the second insulation material A2 is arranged so as to overlap the upper surface of the first insulation material A1, and the underside of the second end A2b of the second insulation material A2 is arranged so as to overlap the upper surface of the third insulation material A3, but is not limited to this arrangement.

[0047] Although not shown in the drawings, for example, it is also possible to change to a peripheral insulation structure in which a second insulation material A2 is disposed below the first insulation material A1 and the third insulation material A3. 10, the first end A2a and the second end A2b of the second insulating material A2 may be omitted, and the first insulating material A1, the second insulating material A2, and the third insulating material A3 may be arranged so that their vertical positions are aligned, resulting in a peripheral insulating structure 13. In this manner, the second insulating material A2 may be arranged so as not to overlap the first insulating material A1 and the third insulating material A3.

[0048] Also, although not shown in the figures, the first end A2a and the second end A2b of the second insulating material A2 in the above embodiment may be omitted, and the first insulating material A1 and the third insulating material A3 may be connected only by the middle portion A2c of the second insulating material A2.

[0049] In the above-mentioned peripheral insulation structure 13, the thickness dimensions, which are dimensions along the vertical direction of the first insulation material A1, the second insulation material A2, and the third insulation material A3, are configured to be the same as each other, but are not limited to this. For example, the thickness dimension of the first insulation material A1 and the thickness dimension of the second insulation material A2 may be different from each other. Also, for example, the thickness dimension of the first insulation material A1 and the thickness dimension of the third insulation material A3 may be different from each other. For example, as shown in FIG. 11, the peripheral insulation structure 13 can be changed to one in which the thickness dimension of the second insulation material A2 is larger than the thickness dimensions of the first insulation material A1 and the third insulation material A3. The thickness dimension of the peripheral insulation structure 13 is preferably within a range of, for example, 5 mm or more and 60 mm or less.

[0050] In the peripheral insulation structure 13, the width dimension, which is the dimension in a direction perpendicular to the straight portion 21a in a plan view of the first insulation material A1, the second insulation material A2, and the third insulation material A3, can also be changed. That is, as shown in FIG. 8, in the peripheral insulation structure 13, the width dimension of the second insulation material A2 is smaller than the width dimensions of the first insulation material A1 and the third insulation material A3. Such a peripheral insulation structure 13 can be changed to a peripheral insulation structure in which the width dimension of the second insulation material A2 is the same as the width dimension of the first insulation material A1 or is larger than the width dimension of the first insulation material A1. The width dimension of the peripheral insulation structure 13 is preferably within a range of, for example, 5 mm or more and 30 mm or less.

[0051] The first insulating material A1, the second insulating material A2, and the third insulating material A3 may be changed to an integrated insulating material. The edge joist insulation part 31 may have a shape that protrudes upward from between the edge joist member 23 and the wall body 92 in a vertical cross-sectional view. The edge joist insulation part 31 may be arranged so as to extend from between the edge joist member 23 and the wall body 92 to between the floor base material 21 and the wall body 92 in a vertical cross-sectional view.

[0052] For example, the first insulating material A1, the second insulating material A2, and the third insulating material A3 can be arranged by shifting them upward or downward. For example, the first end A2a of the second insulating material A2 is arranged between the floor base material 21 and the wall body 92 in the vertical cross section, but it can also be arranged between the edge joist member 23 and the wall body 92 in the vertical cross section. Also, for example, the first end A2a of the second insulating material A2 can be arranged from between the edge joist member 23 and the wall body 92 to between the floor base material 21 and the wall body 92 in the vertical cross section. The second end A2b of the second insulating material A2 can also be arranged between the edge joist member 23 and the wall body 92 in the vertical cross section, or it can be arranged from between the edge joist member 23 and the wall body 92 to between the floor base material 21 and the wall body 92.

[0053] The first insulating material A1 or the second insulating material A2 can also be disposed between the floor base material 21 and the wall body 92 in a vertical cross-sectional view. The first insulating material A1 or the second insulating material A2 can also be disposed from between the floor base material 21 and the wall body 92 to between the edge joist member 23 and the wall body 92.

[0054] The fourth insulating material A4 and the first insulating material A1 may be changed to an integrated insulating material. Also, the fourth insulating material A4 and the third insulating material A3 may be changed to an integrated insulating material. As shown in Fig. 5, the edge joist member 23 supporting the curved portion 21b of the floor base material 21 and the edge joist member 23 adjacent to this edge joist member 23 are arranged with their ends butted together, but this is not limited to this. As shown in Fig. 12, the edge joist member 23 supporting the curved portion 21b of the floor base material 21 and the edge joist member 23 adjacent to this edge joist member 23 can also be arranged with their ends spaced apart. The floor material 12 of this modified example has two edge joist members 23 arranged along the two intersecting straight line portions 21a, and has a space SP2 provided between these two edge joist members 23.

[0055] The peripheral insulation structure 13 of this modified example includes a fifth insulation material A5 arranged to correspond to the curved portion 21b of the floor base material 21. In this way, the edge joist insulation portion 31 at a position corresponding to the curved portion 21b of the floor base material 21 can be composed of the fifth insulation material A5, which is separate from the first insulation material A1 and the third insulation material A3. The fifth insulation material A5 constitutes a part of the edge joist insulation portion 31 and the intermediate insulation portion 32.

[0056] Although the peripheral insulation structure 13 in the above embodiment has four intermediate insulation parts 32 arranged corresponding to the four straight line parts 21a, the number of intermediate insulation parts 32 may be one or more. For example, the peripheral insulation structure 13 can be modified so as to have one intermediate insulation part 32 arranged corresponding to only one straight line part 21a. Also, the peripheral insulation structure 13 can be modified so as to have multiple intermediate insulation parts 32 arranged along one straight line part 21a.

[0057] The heat insulating structure having the first heat insulating material A1, the second heat insulating material A2, and the third heat insulating material A3 is provided along each of the four straight line portions 21a of the floor base material 21, but this heat insulating structure can be provided corresponding to at least one straight line portion 21a. Even in this case, the same effect as that described in (2) above can be obtained.

[0058] The technical ideas that can be understood from the above-described embodiment and modified examples will be described below. A double floor structure comprising a lower insulation structure provided on the underside of the floor base material, the lower insulation structure comprising an insulating layer having breathability and a resin sheet laminated on the underside of the insulating layer. [Explanation of symbols]

[0059] 11…Double floor structure 12…Flooring 13...Periphery insulation structure 14…Lower insulation structure 21…Floor base material 21a…straight line part 21b...Bend 22...Outer peripheral support member 23...Edge joist member 23a...First edge joist member 23b...Second edge joist member 24...Outer support leg 24a...Outer support tip 24b...Outer circumference support connection part 25…Inner support leg 25a...Inner support tip 25b…Inner support connection part 31…Edge joist insulation section 32…Intermediate insulation section 41…Lower insulation material 41a…insulating layer 41b…Resin sheet 91…Foundation 92…Wall body A1~A5: 1st~5th insulation materials A2a...first end A2b…Second end A2c…middle part SP1,SP2…Space part

Claims

1. A double floor structure provided along a wall on a base, A floor material arranged in a spaced-apart state from the wall body; A ventilation-friendly outer periphery insulation structure is provided along the outer periphery of the flooring material, The flooring material has a floor base material and an outer peripheral support member that supports an outer peripheral end portion that is the outermost periphery of the floor base material, The outer peripheral support member is a joist member when the floor base material is placed, and a peripheral support leg that supports the edge beam member in a spaced-apart state from the base, The edge joist members include a plurality of edge joist members arranged adjacent to each other and spaced apart along the outermost periphery of the floor base material, The peripheral insulation structure is A plurality of edge joist insulation parts provided between each of the plurality of edge joist members and the wall body in a plan view; A double floor structure having an intermediate insulation section arranged to connect the multiple edge joist insulation sections.

2. The outermost periphery of the floor base material has a straight portion and a curved portion in a plan view, The peripheral insulation structure includes a first insulation material, a second insulation material, and a third insulation material that are separately arranged in order along the same straight line portion, The first insulation material and the third insulation material are respectively arranged between the plurality of edge joist members and the wall body adjacent to each other in a plan view, the second insulating material has a first end and a second end which are both ends in a direction along the straight portion, and is arranged to connect the first insulating material and the third insulating material; The lower surface of the first end portion is disposed so as to overlap with the upper surface of the first insulating material, The double floor structure according to claim 1 , wherein the lower surface of the second end portion is positioned so as to overlap the upper surface of the third insulation material.

3. The double floor structure according to claim 1 , further comprising a lower insulation structure provided under the floor base material, the lower insulation structure comprising an insulating layer having breathability.

4. The double floor structure according to claim 3, wherein a space is provided between two adjacent edge joists along the outermost periphery of the floor base material without the lower insulation structure being disposed therebetween.

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