Heat insulation airtight structure and construction method of heat insulation airtight structure

Abstract

A heat insulation airtight structure (100) comprises: a foundation heat insulation member (6) that covers an indoor side surface of an outer peripheral foundation (2); a side wall part airtight member (96) that is provided to a side wall part (9) and covers a room from the outdoor side; a foundation airtight member (20) formed by a first airtight member composed of an outer peripheral foundation (2) or a second airtight member that covers the indoor side surface of the foundation heat insulation member (6); and a connection airtight member (10) that extends across the side wall part airtight member (96) and the foundation airtight member (20) and connects the two. The connection airtight member (10) comprises: an upper connection part (10a) connected to the side wall part airtight member (96); a lower connection part (10b) connected to the foundation airtight member (20); and an intermediate connection part (10c) provided between the upper connection part (10a) and the lower connection part (10b) and continuously connected to the upper connection part (10a) and the lower connection part (10b) without a joint.

Description

Heat-insulating and airtight structure and construction method for heat-insulating and airtight structure

[0001] The present invention relates to a heat-insulating and airtight structure and a method for constructing the heat-insulating and airtight structure.

[0002] A conventional heat-insulating and airtight structure for a building includes a foundation insulation member covering the indoor side of the perimeter foundation and an airtight member (see Patent Document 1 below). The building's side walls and the edges of the floor members, which extend vertically, are supported on the top surface of the perimeter foundation via a base. An airtight packing is disposed between the top surface of the foundation insulation member and the base. The airtight packing is integrally attached to the upper end of a cover member that presses the foundation insulation member against the perimeter foundation.

[0003] Here, airtight members may be provided not only on the perimeter foundation but also on the side walls of the building. However, while Patent Document 1 focuses only on the airtightness of the boundary between the perimeter foundation and the base and discloses an airtight packing placed between the perimeter foundation and the base, it does not disclose the relationship between the airtight member of the perimeter foundation and the airtight member provided on the side walls.

[0004] Japanese Patent Application Laid-Open No. 2014-221975

[0005] The object of the present invention is to provide an insulated and airtight structure and its construction method that can ensure the thermal insulation of the perimeter foundation while ensuring the continuity of the airtight line from the side wall portion located above the perimeter foundation to the perimeter foundation.

[0006] A thermally insulated and airtight structure for a building according to one aspect of the present invention comprises a perimeter foundation, a side wall supported on the upper surface of the perimeter foundation, floor members arranged on the indoor side of the side wall, a foundation insulation member covering the indoor side of the perimeter foundation, a side wall airtight member provided on the side wall and covering the room from the outdoor side, a foundation airtight member consisting of either a first airtight member formed by the perimeter foundation or a second airtight member covering the indoor side of the foundation insulation member, and a connecting airtight member extending across and connecting the side wall airtight member and the foundation airtight member, wherein the connecting airtight member has an upper connecting portion connected to the side wall airtight member, a lower connecting portion connected to the foundation airtight member, and an intermediate connecting portion provided between the upper connecting portion and the lower connecting portion and connected continuously and seamlessly to the upper connecting portion and the lower connecting portion.

[0007] A construction method for a thermally insulated and airtight structure according to another aspect of the present invention includes a preparation step in which construction of the foundation airtight member is completed in advance and the connecting airtight member, the side wall airtight member, and a floor panel having the floor member and an underfloor insulation member fixed to the back surface of the floor member are prepared in advance; a connection step in which the side wall airtight member is positioned so as to cover the side wall insulation member from the indoor side and fixed to the indoor side of the side wall main body, and the lower end of the side wall airtight member is connected to the upper end of the foundation airtight member via the connecting airtight member; and a panel installation step in which, after the connection step, the floor panel is installed on the floor support structure so that the intermediate connection portion is sandwiched between the auxiliary support portion and the proximal end of the floor member and between the auxiliary support portion and the underfloor insulation member.

[0008] FIG. 1 is a vertical cross-sectional view from a side wall portion of a building to which a thermally insulated airtight structure according to the first embodiment is applied, extending to a perimeter foundation. FIG. 2 is a plan view of a corner of a floor panel according to the first embodiment, viewed from above. FIG. 3 is an enlarged view showing an arrangement location of a connecting airtight member in FIG. 1. FIG. 4 is a perspective view showing an example of an assembly state of the connecting airtight member. FIG. 5 is a flowchart showing a part of a construction method for the thermally insulated airtight structure according to the first embodiment. FIG. 6 is a view corresponding to FIG. 1 showing a second embodiment. FIG. 7 is an enlarged view showing an arrangement location of a connecting airtight member in FIG. 6. FIG. 8 is a view corresponding to FIG. 1 showing a third embodiment. FIG. 9 is an enlarged view showing an arrangement location of a connecting airtight member in FIG. 8. FIG. 10 is a view corresponding to FIG. 1 showing a fourth embodiment. FIG. 11 is a view corresponding to FIG. 1 showing another embodiment. FIG. 12 is a perspective view showing a support unit extracted from FIG. 11.

[0009] (Embodiment 1) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a vertical cross-sectional view from a side wall portion 9 to a perimeter foundation 2 of a building 1 to which a thermally insulated airtight structure 100 according to an embodiment of the present invention is applied. Note that in this embodiment, an example in which the building 1 is a wooden building will be described as an example, but this is not limited thereto. The building 1 may also be, for example, a steel-framed building or a concrete building. In the following description, the left-right direction in Fig. 1 is defined as the width direction of the building, and the direction perpendicular to the plane of the page in Fig. 1 is defined as the depth direction of the building. However, these directions are defined for convenience in describing the thermally insulated airtight structure 100 according to an embodiment of the present invention, and do not limit the configuration or construction method of the thermally insulated airtight structure 100.

[0010] [Overall structure of the building] Referring to Figure 1, the building 1 has a perimeter foundation 2 that supports the entire building from below, a plurality of floor panels 3 (only one is shown in Figure 1) that form the floor surface inside the room, a floor support structure 4 that supports the plurality of floor panels 3 from below, a dirt floor 5 on which the floor support structure 4 is installed, side wall sections 9 that are placed on the top surface of the perimeter foundation 2 and that separate the indoor space from the outdoor space, and interior panels 15 that are placed on the indoor side of the side wall sections 9.

[0011] The perimeter foundation 2 is composed of concrete poured into the ground and formed into a frame shape corresponding to the planar shape of the building 1. Figure 1 shows only the portion of the frame-shaped perimeter foundation extending in the depth direction of the building. A foundation insulation member 6 is fixed to the indoor side 2b of the perimeter foundation 2. The foundation insulation member 6 is positioned to cover the portion of the indoor side 2b of the perimeter foundation 2 above the floor top insulation member 8 (described later). In this example, the foundation insulation member 6 is composed of a hard insulation material such as extruded polystyrene foam, but is not limited to this and may be composed of, for example, a fiber-based insulation material. A cushion material 6b is provided on the upper end surface of the foundation insulation member 6 as an extension of the foundation insulation member 6. In this example, the foundation insulation member 6 and the cushion material 5b constitute the foundation insulation member of the present invention. The cushion material 6b is composed of insulation and abuts the lower surface of the underfloor insulation member 34. The lower end surface of the foundation insulation member 6 abuts the upper surface of the floor top insulation member 8. The cushion material 6b is arranged so as to fill the gap in the vertical direction between the underfloor insulation member 34 and the basic insulation member 6. The cushion material 6b is made of a heat insulating material that is elastically deformable in the vertical direction, and has the function of absorbing any deviation in the installation position of the underfloor insulation member 34 in the vertical direction and ensuring the continuity of the insulation line between the basic insulation member 6 and the underfloor insulation member 34.

[0012] The earth floor 5 is made of concrete material extending horizontally along the ground on the indoor side of the perimeter foundation 2. An earth floor top surface insulation member 8 is arranged over the entire top surface of the earth floor 5. In this example, the earth floor top surface insulation member 8 is made of a hard insulation material such as extruded polystyrene foam, but is not limited to this and may be made of a fiber insulation material such as cellulose fiber, rock wool, or glass wool.

[0013] [Configuration of Floor Panels] The plurality of floor panels 3 are arranged adjacent to each other without gaps in a plan view. Each floor panel 3 is configured by unitizing a floor finishing material 31, a floor underlayment material 32 (an example of a floor component), and a plurality of joists 33 into a single panel.

[0014] The underfloor material 32 is a board material that serves as a base for the floor finishing material 31, and is made of a building material such as plywood. The floor finishing material 31 is a so-called flooring material, and is fixed to the upper surface of the underfloor material 32 with adhesive, nails, etc. The underfloor material 32 is fixed to the upper surface of a plurality of joists 33. The plurality of joists 33 are prismatic members with a rectangular cross section that extend in the depth direction of the building (the direction perpendicular to the plane of the paper in FIG. 1 ), and are arranged at intervals (equally spaced in this example) from one another in the width direction of the building (the left-right direction in FIG. 1 ).

[0015] The floor panels 3 are then placed on the upper surfaces of the joists 42 of the floor support structure 4, which will be described later. Of the floor panels 3, the floor panel 3 arranged adjacent to the side wall 9 of the building 1 further has underfloor insulation members 34 (see FIG. 2).

[0016] 2 is a plan view of the corner of the floor panel 3 having the underfloor insulation member 34, viewed from above. In this figure, for ease of viewing, the floor finishing material 31 and the underfloor material 32 located above the joists 33 are shown with imaginary lines (two-dot chain lines).

[0017] As shown in this figure, the floor panel 3 has a plurality of first underfloor insulating members 34a and second underfloor insulating members 34b as underfloor insulating members 34. The first underfloor insulating members 34a are respectively arranged between the ends of the plurality of common joists 33. The upper surface of each first underfloor insulating member 34a is fixed in abutment against the lower surface of the underfloor material 32. The second underfloor insulating member 34b extends along the side of the outermost common joist 33 in its entire longitudinal direction (transverse to the depth of the building). The upper surface of the second underfloor insulating member 34b is fixed in abutment against the lower surface of the underfloor material 32. In the following description, when there is no need to distinguish between the first underfloor insulating members 34a and the second underfloor insulating members 34b, they will simply be referred to as underfloor insulating members 34.

[0018] 2, the underfloor material 32 has a supported surface portion 32a that protrudes further outdoors than the underfloor insulation member 34 in a plan view. The supported surface portion 32a is supported from below by an auxiliary support portion 91 provided on the side wall portion 9, which will be described later. The supported surface portion 32a is provided on a portion of the periphery of the underfloor material 32 that runs along the side wall portion 9.

[0019] [Configuration of the Floor Support Structure] Returning to Figure 1, the floor support structure 4 is located indoors relative to the foundation insulation member 6. Specifically, the floor support structure 4 has a plurality of beams 41 (only one is shown in Figure 1) protruding from the upper surface of the earthen floor 5, and a plurality of joists 42 (only one is shown in Figure 1) supported from below by the plurality of beams 41.

[0020] The multiple joists 42 are each made of square timbers with a rectangular cross section that extend in the width direction of the building (left and right direction in Figure 1), and are arranged at intervals (equally spaced in this example) from one another in the depth direction of the building (perpendicular to the plane of Figure 1). The multiple joists 42 are arranged so as to be perpendicular to the multiple joists 33 provided on each floor panel 3 in a plan view. Both longitudinal end faces of the multiple joists 42 face the foundation insulation member 6 with a small gap between them.

[0021] [Configuration of Side Wall] The side wall 9 is disposed on the upper surface of the perimeter foundation 2 along its extension direction (in the example of FIG. 1 , the depth direction of the building, which is perpendicular to the plane of the page). The side wall 9 has a side wall main body 90, an auxiliary support portion 91, and a side wall airtight member 96. The side wall main body 90 has exterior wall panels 92 arranged in this order from the outdoor side to the indoor side in the width direction of the building, an outer heat insulating member 93, a base material 94, and a frame body 98 that houses an inner heat insulating member 95 (an example of a side wall heat insulating member), and the side wall airtight member 96 is provided on the indoor side of the side wall main body 90 (more specifically, the frame body 98).

[0022] The exterior wall panels 92 are members that form the exterior wall surfaces of the building 1 and extend in the vertical direction. The exterior wall panels 92 are disposed slightly outwardly of the outer heat insulating members 93.

[0023] The outer insulating member 93 is disposed on the indoor side of the exterior wall panel 92. The outer insulating member 93 can improve the thermal insulation between the outdoor space and the indoor space. The outer insulating member 93 is made of a hard insulating material such as extruded polystyrene foam. However, the outer insulating member 93 may also be made of the above-mentioned fiber-based insulating material.

[0024] The base material 94 is disposed on the indoor side of the exterior wall panel 92 and is made of, for example, plywood. The base material 94 is fixed with nails or the like to the outdoor side of a frame 98 that forms the framework of the side wall portion 9. In this example, the frame 98 includes a base 97 made of cross beams extending along the upper surface of the perimeter foundation 2 in its extension direction (in the example of FIG. 1 , the building depth direction, which is perpendicular to the plane of the page), a pair of main columns (not shown) connected to both ends of the base 97 and extending in the vertical direction, upper cross beams (e.g., eaves beams) that connect the upper ends of the pair of main columns, and multiple intermediate columns 99 (e.g., partition columns and half columns; see FIG. 4 ) provided between the pair of main columns. The multiple intermediate columns are arranged at intervals from one another in the extension direction of the base 97.

[0025] The inner heat insulating member 95 is made of a plurality of heat insulating materials housed in a housing chamber R, which is a space between adjacent columns in the frame body 98. The heat insulating materials are made of the fiber-based heat insulating material. However, the inner heat insulating member 95 may also be made of a hard heat insulating material such as extruded polystyrene foam.

[0026] The side wall airtight member 96 is fixed to the indoor side surface of the frame body 98 so as to cover the entire indoor side of the side wall 9. Details of the side wall airtight member 96 will be described later.

[0027] The base 97, which constitutes the lower end of the frame 98, is fixed to the upper surface 2a of the outer periphery foundation 2 by a plurality of fixing brackets (not shown) interposed between its underside and the outer periphery foundation 2. The fixing brackets are arranged at intervals along the longitudinal direction of the base 97. The space between the underside of the base 97 and the upper surface 2a of the outer periphery foundation 2 is blocked by a plurality of insulating materials 7a. The insulating materials 7a are respectively arranged in the spaces between the fixing brackets. The insulating materials 7a constitute the foundation upper surface insulating members 7, which will be described later. In this example, each insulating material 7a is made of a hard insulating material such as extruded polystyrene foam, but the material is not limited to this and may be made of, for example, the fiber-based insulating material.

[0028] The auxiliary support portion 91 is formed so as to protrude indoors from the lower end of the side wall main body 90. In this example, the auxiliary support portion 91 is made of a square timber (base wood) with a rectangular cross section that extends in the longitudinal direction (perpendicular to the plane of the paper in FIG. 1 ) along the indoor side surface of a base 97 of the side wall main body 90, and is fixed to the base 97 by, for example, screws or adhesive. The auxiliary support portion 91 may also be formed integrally with the side wall main body 90.

[0029] [Configuration of Interior Panel] The interior panel 15 is made of a plate material such as gypsum board, and is arranged so that its inner surface faces the indoor space. The interior panel 15 is arranged vertically on the indoor side of the side wall airtight member 96. The upper end surface of the interior panel 15 abuts against the underside of a ceiling plate (not shown) that forms the ceiling surface of the room. The lower end surface of the interior panel 15 abuts against a proximal end of the floor finishing material 31 provided on the floor panel 3, which is located closer to the side wall 9 than the floor support structure 40.

[0030] [Details of the thermally insulated and airtight structure] Next, the thermally insulated and airtight structure 100 of the building 1 in this embodiment will be described with reference to Fig. 1. Note that Fig. 1 shows the thermally insulated and airtight structure 100 for ensuring thermal insulation and airtightness in the width direction of the building (the left-right direction in Fig. 1) as an example, but a similar thermally insulated and airtight structure is also applied in the depth direction of the building. In the following, for simplicity of explanation, only the thermally insulated and airtight structure 100 in the width direction of the building will be described.

[0031] The heat insulating and airtight structure 100 is constructed by combining a heat insulating structural part and an airtight structural part.

[0032] The thermal insulation structure includes the above-mentioned outer insulation member 93, inner insulation member 95, foundation top surface insulation member 7, underfloor insulation member 34, foundation insulation member 6, and floor top surface insulation member 8. The configuration of each of these insulation members has already been explained, so detailed explanation will be omitted.

[0033] The airtight structure includes a side wall airtight member 96 , a basic airtight member 20 , and a connecting airtight member 10 .

[0034] The side wall airtight member 96 is composed of, for example, a single airtight sheet. The side wall airtight member 96 is formed so as to cover the entire indoor side surface of the side wall 9. The side wall airtight member 96 is fixed with staples, tape, or the like to the indoor side surface of the frame 98 that forms the framework of the side wall 9. The material of the airtight sheet is not particularly limited, and various synthetic resin sheets such as polyethylene and polypropylene can be used.

[0035] In this example, the foundation airtight member 20 is formed by the outer perimeter foundation 2 itself. Since the outer perimeter foundation 2 is made of concrete, it has airtightness in the direction from the inside to the outside of the building (in the example of FIG. 1 , the width direction of the building).

[0036] The connecting airtight member 10 extends across and connects the side wall airtight member 96 and the base airtight member 20. The connecting airtight member 10 is made of, for example, a single airtight sheet. The material of the airtight sheet is not particularly limited, and various synthetic resin sheets such as polyethylene and polypropylene can be used.

[0037] The detailed shape of the linked airtight member 10 will be described with reference to Figures 3 and 4. Figure 3 is an enlarged view showing an arrangement location of the linked airtight member 10 in Figure 1. Figure 4 is a perspective view showing an example of an assembled state of the linked airtight member 10.

[0038] As shown in these figures, the connecting airtight member 10 has an upper connecting portion 10a, a lower connecting portion 10b, and an intermediate connecting portion 10c.

[0039] The upper connection portion 10a has a rectangular plate shape extending in the depth direction of the building and is arranged so as to overlap the lower end of the side wall airtight member 96 (see FIG. 3) from the indoor side. The upper connection portion 10a is connected to the side wall airtight member 96 using airtight tape or the like. The airtight tape may have an adhesive surface on only one side or on both sides. An airtight tape having an adhesive surface on one side is arranged, for example, to cover the boundary position between the upper edge of the upper connection portion 10a and the indoor side of the side wall airtight member 96. An airtight tape having adhesive surfaces on both sides is arranged, for example, at the overlapping surface between the upper connection portion 10a and the side wall airtight member 96.

[0040] The lower connection portion 10b has a rectangular plate shape extending in the depth direction of the building and is arranged so as to abut against the foundation top surface insulation member 7 and the peripheral foundation 2 (corresponding to the first airtight member that constitutes the foundation airtight member) from the indoor side. The upper end of the lower connection portion 10b is sandwiched and fixed between the foundation top surface insulation member 7 and the cushion material 6b. The lower end of the lower connection portion 10b is sandwiched and fixed between the peripheral foundation 2 and the foundation insulation member 6. The lower connection portion 10b may be fixed to the indoor side surface 2b of the peripheral foundation 2 using airtight tape or the like.

[0041] The intermediate connection portion 10c is provided between the upper connection portion 10a and the lower connection portion 10b and is continuously and seamlessly connected to the upper connection portion 10a and the lower connection portion 10b.

[0042] Specifically, intermediate connection portion 10c has a U-shaped cross section extending in the depth direction of the building, and engages (fits) with auxiliary support portion 91 of side wall portion 9 from the indoor side. More specifically, intermediate connection portion 10c functions as a covering portion that covers upper surface 91a, protruding side end surface 91b, and lower surface 91c of auxiliary support portion 91. The upper edge of intermediate connection portion 10c is connected to the lower edge of upper connection portion 10a, and the lower edge of intermediate connection portion 10c is connected to the upper edge of lower connection portion 10b.

[0043] 3, the portion of the intermediate connection portion 10c covering the upper surface 91a of the auxiliary support portion 91 is fixed by being sandwiched between the upper surface 91a and a supported surface portion 32a formed on the peripheral edge of the underfloor material 32. The portion of the intermediate connection portion 10c covering the protruding side end surface 91b of the auxiliary support portion 91 is fixed by being sandwiched between the end surface 91b and the underfloor insulation member 34. The portion of the intermediate connection portion 10c covering the lower surface 91c of the auxiliary support portion 91 is fixed by being sandwiched between the lower surface 91c and the cushion material 6b.

[0044] [Details of Construction Method of Heat-Insulated Airtight Structure] Next, steps S1 to S5 related to the procedure for assembling the connecting airtight member 10 in the construction method of the heat-insulated airtight structure 100 will be described. Figure 5 is a flowchart showing the general flow of this assembly procedure. In this example, the installation of the connecting airtight member 10 is performed after the installation of the floor support structure 4 inside the perimeter foundation 2 has been completed.

[0045] As shown in this figure, steps S1 to S5 involved in the assembly procedure of the connected airtight member 10 include a preparation step S1, a base board installation step S2, a connection step S3, a first post-connection step S4, and a second post-connection step S5 (corresponding to a floor panel installation step). Note that the order in which these steps S1 to S5 are performed may be changed as appropriate within the physically possible range.

[0046] The preparation step S1 is a step in which the construction of the foundation airtight member 20 is completed before the assembly of the connecting airtight member 10 (see FIG. 3), and the connecting airtight member 10, the side wall airtight member 96, and the floor panel 3 are prepared in advance. In this example, the foundation airtight member 20 is formed by the foundation 2 itself, and therefore the construction of the foundation 2 completes the construction of the foundation airtight member 20 at the same time.

[0047] The furring strip installation step S2 is a step of fixing the furring strips constituting the auxiliary support portion 91 (see FIG. 3) to the indoor side of the base 97, which is the lower side of the frame body 98. Specifically, in the furring strip installation step S2, the furring strips are placed along the indoor side of the base 97 and fixed to the base 97 using nails or the like.

[0048] The connecting step S3 is a step of arranging the side wall airtight member 96 so as to cover the inner insulating member 95 (an example of a side wall insulating member) from the indoor side and fixing it to the indoor side of the side wall main body 90, and connecting the lower end of the side wall airtight member 96 (see FIG. 3 ) to the upper end of the outer periphery foundation 2, which is the foundation airtight member 20, with the connecting airtight member 10. Specifically, in the connecting step S3, first, the airtight sheet constituting the side wall airtight member 96 is arranged over the entire indoor side of the side wall 90, from the upper end to the lower end, and the airtight sheet is fixed to the frame body 98, which is the skeleton of the side wall main body 90, with staples, tape, or the like. Next, in the connecting step S3, the connecting airtight member 10 is engaged with and fixed to the auxiliary support member 91 from the indoor side. More specifically, in the connecting step S3, the connecting airtight member 10 is positioned so that the intermediate connecting portion 10c of the connecting airtight member 10 engages (fits) with the outer surface of the auxiliary support portion 91. Then, the upper connecting portion 10a of the connecting airtight member 10 is positioned so as to overlap the side wall airtight member 96 from the indoor side, and the upper connecting portion 10a is connected to the side wall airtight member 96 in a breathable manner using airtight tape or the like. Furthermore, the lower connecting portion 10b of the connecting airtight member 10 is positioned so as to abut against the indoor side surface 2b of the perimeter foundation 2, and the lower connecting portion 10b is connected to the indoor side surface 2b of the perimeter foundation 2 in a breathable manner using airtight tape or the like.

[0049] The first post-connection process S4 is a process of installing the insulating material that constitutes the basic insulation member 6 (see FIG. 3 ) to sandwich and fix the lower connection portion 10b of the connecting airtight member 10 between the basic insulation member 6 and the periphery foundation 2. Specifically, the insulating material that constitutes the basic insulation member 6 is pressed against the indoor side surface 2b of the periphery foundation 2 and fixed with an adhesive or the like. In this way, the lower connection portion 10b of the connecting airtight member 10 is sandwiched and fixed between the basic insulation member 6 and the periphery foundation 2.

[0050] The second post-connection process S5 involves installing the floor panel 3 (see Figures 1 and 3) having the underfloor insulation member 34 at a predetermined position above the joists 42 of the floor support structure 4 (a predetermined position for forming the floor surface adjacent to the side wall 9), thereby sandwiching the connecting airtight member 10 between the outdoor end surface of the underfloor insulation member 34 and the auxiliary support portion 91 of the side wall 9. Specifically, in the second post-connection process, the worker places the cushion material 6b on the upper end surface of the basic insulation member 6 and then installs the floor panel 3. By placing the floor panel 3, as shown in Figure 3, the intermediate connection portion 10c of the connecting airtight member 10 is sandwiched and fixed between the outer end surface of the underfloor insulation member 34 of the floor panel 3 and the protruding end surface 91b of the auxiliary support portion 91. Furthermore, by installing the floor panel 3, the cushion material 6b is sandwiched between the underfloor insulation member 34 of the floor panel 3 and the basic insulation member 6, and is slightly compressed in the vertical direction. As a result, even if there is a deviation in the height position of the floor panel 3, the deviation is absorbed by the cushion material 6b.

[0051] [Effects] As described above, the heat-insulating airtight structure 100 of this embodiment comprises the perimeter foundation 2, the side wall portions 9 supported on the upper surface of the perimeter foundation 2, the floor underlayment 32 arranged on the indoor side of the side wall portions 9, the foundation insulation member 6 covering the indoor side of the perimeter foundation 2, the side wall airtight members 96 provided on the side wall portions 9 and covering the room from the outdoor side, the foundation airtight member 20 constituted by the perimeter foundation 2 itself, and the connecting airtight member 10 extending across the side wall airtight member 96 and the perimeter foundation 2 to connect them, the connecting airtight member 10 having an upper connecting portion 10a connected to the side wall airtight member 96, a lower connecting portion 10b connected to the foundation airtight member 20, and an intermediate connecting portion 10c provided between the upper connecting portion 10a and the lower connecting portion 10b and continuously and seamlessly connecting the upper connecting portion 10a and the lower connecting portion 10b.

[0052] With this configuration, the foundation insulation member 6 covering the indoor side of the perimeter foundation 2 ensures thermal insulation in the perimeter foundation 2, while the three members, the sidewall airtight member 96, the foundation airtight member 20, and the connecting airtight member 10, form a continuous airtight line (a line when the airtight surface is viewed from the side) from the sidewall 9 of the building 1 to the perimeter foundation 2. That is, with this configuration, the upper connecting portion 10a of the connecting airtight member 10 is connected to the sidewall airtight member 96, the lower connecting portion 10b is connected to the foundation airtight member, and the intermediate connecting portion 10c is continuously and seamlessly connected to the upper connecting portion 10a and the lower connecting portion 10b, so that the airtight line formed by the sidewall airtight member 96 and the airtight line formed by the foundation airtight member 20 can be continuously connected via the connecting airtight member 10. Thus, the thermal insulation in the perimeter foundation 2 of the building 1 can be ensured while ensuring the continuity of the airtight line from the sidewall 9 of the building 1 to the perimeter foundation 2.

[0053] In this embodiment, the side wall portion 9 has a side wall portion 9 main body erected on the outer periphery foundation 2 so as to form a storage chamber R, and an inner insulation member 95 provided within the storage chamber R, and a side wall portion airtight member 96 is provided on the indoor side of the side wall portion 9 main body so as to cover the inner insulation member 95 from the indoor side.

[0054] This configuration can prevent humid air from entering the interior of the room and causing condensation in the interior heat insulating member 95 in winter or in cold regions.

[0055] In addition, in this embodiment, the building 1 has a floor support structure 4 that is located indoors relative to the foundation insulation member 6 and supports the floor underlayment 32 from below, and an auxiliary support portion 91 that is located on the indoor side of the side wall main body 90, between a proximal end portion of the floor underlayment 32 that is closer to the side wall portion 9 than the floor support structure portion 4 and the upper surface of the outer foundation 2 and supports the proximal end portion, and the intermediate connection portion 10c of the connecting airtight member 10 is arranged so as to pass on the indoor side of the auxiliary support portion 91 or between the auxiliary support portion 91 and the side wall main body 90.

[0056] According to this configuration, the auxiliary support portion 91 improves the vertical deflection strength of the proximal end of the underfloor material 32 near the side wall portion 9, while allowing the connecting airtight member 10 to be positioned space-efficiently. That is, when the foundation insulation member 6 is positioned on the indoor side of the perimeter foundation 2 as in this configuration, the floor support structure 4 must be positioned indoors compared to when the foundation insulation member 6 is not provided. As a result, the support position of the underfloor material 32 by the floor support structure 4 moves relatively indoors. This increases the distance from the support position to the proximal end of the underfloor material 32, resulting in a problem of reduced deflection rigidity at the proximal end of the underfloor material 32. In contrast, in this configuration, the proximal end of the underfloor material 32 is supported by the auxiliary support portion 91, thereby preventing a decrease in deflection rigidity at the proximal end of the underfloor material 32. This prevents the proximal end of the underfloor material 32 from sinking downward due to aging deformation of the underfloor material 32 or loads (such as those from people or furniture) acting on the upper surface of the underfloor material 32. In this configuration, the intermediate connection portion 10c of the connecting airtight member 10 is positioned on the indoor side of the auxiliary support portion 91 (i.e., so as to bypass the auxiliary support portion 91), so that the connecting airtight member 10 can be positioned in a space-efficient manner without interfering with the auxiliary support portion 91.

[0057] In addition, in this embodiment, the intermediate connection portion 10c is arranged so that a portion of the intermediate connection portion 10c passes through the indoor side of the auxiliary support portion 91 with the portion being clamped between the proximal end of the floor underlayment 32 and the auxiliary support portion 91.

[0058] According to this configuration, a portion of the intermediate connection portion 10c of the connecting airtight member 10 is clamped between the proximal end portion of the floor underlayment 32 and the auxiliary support portion 91, thereby preventing the connecting airtight member 10 from loosening or twisting and preventing the connecting airtight member 10 from coming into contact with surrounding components and being damaged.

[0059] In this embodiment, the heat-insulating and airtight structure 100 further includes an underfloor insulating member 34. The underfloor insulating member 34 is sandwiched between the base insulating member 6 and the proximal end of the underfloor material 32, and is arranged so as to sandwich a part of the intermediate connection portion 10c of the connecting airtight member 10 between the auxiliary support portion 91 and the underfloor insulating member 34.

[0060] According to this configuration, a portion of the intermediate connection portion 10c of the connecting airtight member 10 is clamped between the auxiliary support portion 91 and the underfloor insulation member 34, thereby preventing the connecting airtight member 10 from loosening or twisting and preventing the connecting airtight member 10 from coming into contact with surrounding components and being damaged.

[0061] In addition, the construction method of the insulated airtight structure 100 in this embodiment includes a preparation process S1 in which the construction of the foundation airtight member 20 is completed in advance and the connecting airtight member 10, the side wall airtight member 96, the underfloor material 32, and the floor panel 3 having the underfloor insulation member 34 fixed to the back surface of the underfloor material 32 are prepared in advance; a connection process S3 in which the side wall airtight member 96 is positioned so as to cover the inner insulation member 95 (side wall insulation member) from the indoor side and fixed to the indoor side of the side wall main body 90, and the lower end of the side wall airtight member 96 and the upper end of the foundation airtight member 20 are connected via the connecting airtight member 10; and a second post-connection process (panel installation process) in which, after the connection process S3, the floor panel 3 is installed on the floor support structure 4 so that the intermediate connection portion 10c is sandwiched between the auxiliary support portion 91 and the proximal end of the underfloor material 32 and between the auxiliary support portion 91 and the underfloor insulation member 34.

[0062] According to this configuration, when the floor panel 3 is installed, the intermediate connection portion 10c of the connecting airtight member 10 is clamped between the auxiliary support portion 91 and the proximal end of the underfloor material 32, and between the auxiliary support portion 91 and the underfloor insulation member 34. This prevents the connecting airtight member 10 from loosening or twisting.

[0063] In this embodiment, in the connecting step S3, the side wall airtight member 96 is arranged and then the connecting airtight member 10 is arranged, and the side wall airtight member 96 and the foundation airtight member 20 are connected by the connecting airtight member 10, but this is not limited to this, and the side wall airtight member 96 may be arranged after the connecting airtight member 10 is arranged, and then the side wall airtight member 96 and the foundation airtight member 20 may be connected by the connecting airtight member 10. In other words, the order of installation of the side wall airtight member 96 and the connecting airtight member 10 in the connecting step S3 does not matter.

[0064] (Embodiment 2) Figure 6 is a diagram equivalent to Figure 1 showing embodiment 2, and Figure 7 is an enlarged view showing the arrangement location of the connecting airtight member 11 in Figure 6. In this embodiment 2, the configuration of the basic airtight member 20 and the configuration of the connecting airtight member 11 (reference numeral 10 in embodiment 1) are different from those of embodiment 1. Note that, except for this point, the other configurations are the same as those of embodiment 1, so the same reference numerals are used and detailed description thereof will be omitted.

[0065] That is, whereas in the first embodiment, the foundation airtight member 20 is formed by the peripheral foundation 2, in this embodiment, the foundation airtight member 20 is formed by a urethane layer 21 that covers the indoor side of the foundation insulation member 6. The urethane layer 21 is formed, for example, by spraying urethane foam onto the indoor side of the foundation insulation member 6. Note that the foundation airtight member 20 is not limited to the urethane layer 21, and may be formed, for example, by a resin airtight sheet, polystyrene foam, phenol foam, or the like.

[0066] The connecting airtight member 11 is formed to connect the urethane layer 21 covering the indoor side surface of the basic insulation member 6 and the side wall airtight member 96.

[0067] Specifically, as shown in FIG. 7, the connecting airtight member 11 has an upper connecting portion 11a, a lower connecting portion 11b, and an intermediate connecting portion 11c.

[0068] The upper connection portion 11a has a rectangular plate shape extending in the depth direction of the building, and is disposed so as to overlap the side wall airtight member 96 from the indoor side. The upper connection portion 11a is connected to the side wall airtight member 96 using airtight tape or the like.

[0069] The lower connection portion 11b extends downward from the tip edge (indoor side edge) of the indoor side extension portion 11e described below and is arranged so as to overlap the urethane layer 21 from the indoor side. The lower connection portion 11b is connected to the urethane layer 21 using airtight tape or the like.

[0070] The intermediate connection portion 11c is provided between the upper connection portion 11a and the lower connection portion 11b and is continuously and seamlessly connected to the upper connection portion 11a and the lower connection portion 11b. Specifically, the intermediate connection portion 11c has a covering portion 11d with an inverted L-shaped cross section that covers the upper surface 91a and the protruding-side end surface 91b of the auxiliary support portion 91, and an indoor-side extension portion 11e that extends horizontally from the lower end of the covering portion 11d toward the indoor side. The upper edge of the covering portion 11d is connected to the lower edge of the upper connection portion 11a, and the leading edge (indoor-side edge) of the indoor-side extension portion 11e is connected to the upper edge of the lower connection portion 11b.

[0071] The portion of the covering portion 11d that covers the upper surface 91a of the auxiliary support portion 91 is fixed by being sandwiched between the upper surface 91a and a supported surface portion 32a formed on the peripheral edge of the underfloor material 32. The portion of the covering portion 11d that covers the protruding side end surface 91b of the auxiliary support portion 91 is fixed by being sandwiched between the end surface 91b and the underfloor insulation member 34. On the other hand, the indoor side extending portion 11e is fixed by being sandwiched between the lower surface of the underfloor insulation member 34 and the upper surface of the cushion material 6b.

[0072] [Action and effect] As described above, in this embodiment, the insulated airtight structure 100 comprises a peripheral foundation 2, a side wall portion 9 supported on the upper surface of the peripheral foundation 2, a floor underlayment 32 arranged on the indoor side of the side wall portion 9, a foundation insulation member 6 covering the indoor side of the peripheral foundation 2, a side wall airtight member 96 provided on the side wall portion 9 and covering the room from the outdoor side, a foundation airtight member 20 consisting of a urethane layer 21 covering the indoor side of the peripheral foundation 2, and a connecting airtight member 11 extending across the side wall airtight member 96 and the foundation airtight member 20 to connect them, and the connecting airtight member 11 has an upper connecting portion 11a connected to the side wall airtight member 96, a lower connecting portion 11b connected to the foundation airtight member 20, and an intermediate connecting portion 11c provided between the upper connecting portion 11a and the lower connecting portion 11b and connected continuously and seamlessly to the upper connecting portion 11a and the lower connecting portion 11b. Therefore, the same effects as those of the first embodiment can be achieved.

[0073] In addition, in this embodiment, the foundation airtight member 20 is composed of a urethane layer 21 arranged to cover the indoor side of the foundation insulation member 6, which can prevent highly humid air on the indoor side of the outer foundation 2 from entering the foundation insulation member 6 and causing condensation in winter or in cold regions.

[0074] (Embodiment 3) Fig. 8 is a diagram equivalent to Fig. 1 showing embodiment 3, and Fig. 9 is an enlarged view showing the arrangement location of the connecting airtight member 12 in Fig. 8. In this embodiment 3, the configuration (arrangement path) of the connecting airtight member 12 (reference numeral 10 in embodiment 1) is different from that of embodiment 1. Note that, except for this point, the other configurations are the same as those of embodiment 1, so the same reference numerals are used and detailed description thereof will be omitted.

[0075] That is, in the first embodiment, the connecting airtight member 10 is arranged so as to pass through the indoor side of the auxiliary support portion 91, whereas in the present embodiment, the connecting airtight member 12 is arranged so as to pass through the outdoor side of the auxiliary support portion 91 (in this example, between the auxiliary support portion 91 and the base 97).

[0076] Specifically, as shown in FIG. 9, the connecting airtight member 12 has an upper connecting portion 12a, a lower connecting portion 12b, and an intermediate connecting portion 12c.

[0077] The upper connection portion 12a is arranged to overlap the side wall airtight member 96 from the indoor side, similar to the upper connection portion 11a of the first embodiment. The upper connection portion 12a is connected to the indoor side of the side wall airtight member 96 using airtight tape or the like in a non-ventilable manner.

[0078] The lower connection portion 12b is arranged to overlap the indoor side surface 2b of the perimeter foundation 2, which is the foundation airtight member 20, similar to the lower connection portion 11b of the first embodiment. The lower connection portion 11b is connected to the indoor side surface 2b of the perimeter foundation 2 using airtight tape or the like in a non-ventilable manner.

[0079] The intermediate connection portion 12c has an L-shaped cross section that is continuously connected to the lower end of the upper connection portion 12a. The upper edge of the vertical portion of the intermediate connection portion 12c is continuously connected to the upper connection portion 12a. The vertical portion of the intermediate connection portion 12c is sandwiched between the auxiliary support portion 91 and the base 97. The horizontal portion of the intermediate connection portion 12c extends horizontally from the lower edge of the vertical portion toward the indoor side. The horizontal portion of the intermediate connection portion 12c is sandwiched between the lower surface 91c of the auxiliary support portion 91 and the upper surface of the foundation top surface insulation member 7. The tip edge (indoor side edge) of the horizontal portion of the intermediate connection portion 12c is connected to the upper edge of the lower connection portion 12b.

[0080] [Effects] In this embodiment, the heat-sealed airtight structure 100 is provided with a connecting airtight member 12, which has an upper connection portion 12a connected to the side wall airtight member 96, a lower connection portion 12b connected to the outer periphery foundation 2 which is the foundation airtight member 20, and an intermediate connection portion 12c provided between the upper connection portion 12a and the lower connection portion 12b and continuously and seamlessly connected to the upper connection portion 12a and the lower connection portion 12b, so that the same effects as those of the first embodiment can be obtained.

[0081] In this embodiment, the intermediate connection portion 12 c of the connecting airtight member 12 is disposed so as to pass between the auxiliary support portion 91 and the side wall portion main body 90 .

[0082] With this configuration, the shape of the connecting airtight member 10 can be simplified compared to when the connecting airtight member 12 passes through the indoor side of the auxiliary support part 91. In other words, there is no need to bend the connecting airtight member 12 in a complex manner so as not to interfere with the components (such as the floor panel 3 and the basic insulation member 6) located on the indoor side of the auxiliary support part 91. Therefore, the shape of the connecting airtight member 12 can be simplified, and manufacturing costs can be reduced.

[0083] In addition, in this embodiment, the intermediate connection portion 12c of the connecting airtight member 12 is clamped between the auxiliary support portion 91 and the side wall portion main body 90, and the lower connection portion 12b is clamped between the outer base 2 (first airtight member) which is the base airtight member 20 and the base insulation member 6.

[0084] According to this configuration, not only is the intermediate connection portion 12c of the connecting airtight member 12 sandwiched between the auxiliary support portion 91 and the side wall main body 90, but the lower connection portion 12b of the connecting airtight member 12 is sandwiched between the outer periphery foundation 2 and the foundation heat insulation member 6, so that loosening and twisting of the connecting airtight member 12 can be prevented. Therefore, the connecting airtight member 12 can be prevented from coming into contact with surrounding components and being damaged.

[0085] (Embodiment 4) Fig. 10 is a view corresponding to Fig. 3 and shows embodiment 4. This embodiment differs from embodiment 1 in that the auxiliary support part 91 has a groove K, and the heat-sealed airtight structure 100 includes a connecting airtight member 13 used in this groove K. Note that a connecting airtight member 10 (not shown in Fig. 10) similar to embodiment 1 is attached to the portion of the auxiliary support part 91 other than the groove K.

[0086] As shown in Fig. 10, the groove K is formed in the longitudinal middle of the auxiliary support part 91. The groove K is formed so that the electrical wiring C can be inserted therethrough. The basic insulation member 6 is also formed with a groove portion 6a extending in the vertical direction that can receive the electrical wiring C. Note that the use of the groove K is not limited to the insertion of the electrical wiring C, and it may also be used for inserting piping, for example.

[0087] The connecting airtight member 13 has an upper connecting portion 13a, a lower connecting portion 13b, and an intermediate connecting portion 13c.

[0088] The upper connection portion 13a has a rectangular plate shape extending in the depth direction of the building, and is disposed so as to overlap the side wall airtight member 96 from the indoor side. The upper connection portion 10a is connected to the side wall airtight member 96 using airtight tape or the like in a breathable manner.

[0089] The lower connection portion 13b has a rectangular plate shape extending in the depth direction of the building and extends in the vertical direction so as to cover the upper end of the indoor side surface 2b of the perimeter foundation 2. The lower connection portion 13b is connected to the side wall airtight member 96 using airtight tape or the like in a manner that prevents air from passing through.

[0090] In the groove K, the intermediate connecting portion 13c is formed so as to be in close contact with the wall surface of the groove K. The intermediate connecting portion 13c has a three-dimensional shape corresponding to the shape of the inner wall surface of the groove K. Specifically, the intermediate connecting portion 13c has a pair of side surfaces 13d that cover a pair of opposing end surfaces of the groove K, and a connecting surface 13e that connects the base end edges of the pair of side surfaces 13d.

[0091] [Effects] In this embodiment, the auxiliary support portion 91 is arranged on the indoor side of the side wall main body 90 so as to form a groove K that extends in the vertical direction and opens horizontally to the indoor side, and the intermediate connection portion 13c of the connecting airtight member 13 has a three-dimensional shape that fits closely to the inner surface of the groove K.

[0092] According to this configuration, the groove K provided in the auxiliary support portion 91 can be used to ensure a routing path for an electric cord or the like, while ensuring airtightness in the groove K.

[0093] The above-described specific embodiments mainly include inventions having the following configurations.

[0094] A thermally insulated and airtight structure for a building according to one aspect of the present invention comprises a perimeter foundation, a side wall supported on the upper surface of the perimeter foundation, floor members arranged on the indoor side of the side wall, a foundation insulation member covering the indoor side of the perimeter foundation, a side wall airtight member provided on the side wall and covering the room from the outdoor side, a foundation airtight member consisting of either a first airtight member formed by the perimeter foundation or a second airtight member covering the indoor side of the foundation insulation member, and a connecting airtight member extending across and connecting the side wall airtight member and the foundation airtight member, wherein the connecting airtight member has an upper connecting portion connected to the side wall airtight member, a lower connecting portion connected to the foundation airtight member, and an intermediate connecting portion provided between the upper connecting portion and the lower connecting portion and connected continuously and seamlessly to the upper connecting portion and the lower connecting portion.

[0095] According to the above configuration, the foundation insulation member covering the indoor side of the perimeter foundation ensures thermal insulation of the perimeter foundation, while the sidewall airtight member, foundation airtight member, and connecting airtight member form a continuous airtight line (a line when the airtight surface is viewed from the side) extending from the sidewall of the building to the perimeter foundation. In other words, in this configuration, the upper connecting portion of the connecting airtight member is connected to the sidewall airtight member, the lower connecting portion is connected to the foundation airtight member, and the intermediate connecting portion is continuously and seamlessly connected to the upper and lower connecting portions. This allows the airtight line formed by the sidewall airtight member and the airtight line formed by the foundation airtight member to be continuously connected via the connecting airtight member. This ensures thermal insulation of the building's perimeter foundation while ensuring the continuity of the airtight line extending from the sidewall of the building to the perimeter foundation. Note that "continuously and seamlessly formed" means that each connecting airtight member is continuously and seamlessly formed. For example, if multiple connecting airtight members are arranged along the extension direction of the perimeter foundation, there may be joints between each connecting airtight member.

[0096] In the insulated and airtight structure of the building, the side wall portion has a side wall portion main body erected on the outer periphery foundation so as to form a storage chamber, and a side wall portion insulating member provided within the storage chamber, and it is preferable that the side wall portion airtight member is provided on the indoor side of the side wall portion main body so as to cover the side wall portion insulating member from the indoor side.

[0097] According to the above configuration, in winter or in cold regions, it is possible to prevent humid air from the indoor side of the room from entering the side wall heat insulating member and causing condensation.

[0098] The thermally insulated and airtight structure of the building preferably comprises a floor support structure that is located indoors of the foundation insulation member and supports the floor member from below, and an auxiliary support that protrudes indoors of the side wall main body and is connected to the side wall main body or is supported on the upper surface of the outer foundation, supporting the proximal end of the floor member that is located closer to the side wall than the floor support structure, and the intermediate connection portion of the connecting airtight member is preferably arranged to pass on the indoor side of the auxiliary support portion or between the auxiliary support portion and the side wall main body.

[0099] According to the above configuration, the auxiliary support portion improves the vertical deflection strength of the proximal end of the floor member near the side wall portion, while allowing the connecting airtight member to be positioned space-efficiently. Specifically, when the foundation insulation member is positioned on the indoor side of the outer perimeter foundation as in this configuration, the floor support structure must be positioned indoors compared to when the foundation insulation member is not provided. As a result, the support position of the floor member by the floor support structure moves relatively indoors. This increases the distance from the support position to the proximal end of the floor member, resulting in a problem of reduced deflection rigidity at the proximal end of the floor member. In contrast, this configuration prevents a decrease in the deflection rigidity of the proximal end of the floor member by supporting the proximal end of the floor member with the auxiliary support portion. This prevents the proximal end of the floor member from sinking downward due to aging of the floor member or loads acting on the upper surface of the floor member (loads from people, furniture, etc.). In this configuration, the intermediate connection portion of the connecting airtight member is positioned so that it passes on the indoor side of the auxiliary support portion or between the auxiliary support portion and the side wall portion main body (i.e., so that it bypasses the auxiliary support portion), so that the connecting airtight member can be positioned space-efficiently without interfering with the auxiliary support portion.

[0100] In the insulated and airtight structure of the building, it is preferable that the intermediate connection portion is arranged so that a portion of the intermediate connection portion passes through the indoor side of the auxiliary support portion with the portion sandwiched between the proximal end portion and the auxiliary support portion.

[0101] According to the above configuration, a portion of the intermediate connection portion of the connecting airtight member is clamped between the proximal end portion and the auxiliary support portion, thereby preventing the connecting airtight member from loosening or twisting and preventing the connecting airtight member from coming into contact with surrounding components and being damaged.

[0102] It is preferable that the insulated and airtight structure of the building further includes an underfloor insulation member that is sandwiched between the basic insulation member and the proximal end portion and that sandwiches a portion of the intermediate connection portion between the basic insulation member and the auxiliary support portion.

[0103] According to the above configuration, a portion of the intermediate connection portion of the connecting airtight member is clamped between the auxiliary support portion and the underfloor insulation member, thereby preventing the connecting airtight member from loosening or twisting and preventing the connecting airtight member from coming into contact with surrounding component members and being damaged.

[0104] In the insulated and airtight structure of the building, it is preferable that the intermediate connection portion is sandwiched between the auxiliary support portion and the side wall portion main body, and the lower connection portion is sandwiched between the outer foundation that constitutes the first airtight member and the foundation insulation member.

[0105] According to the above-mentioned configuration, not only is the intermediate connection part of the connecting airtight member sandwiched between the auxiliary support part and the side wall main body, but the lower connection part of the connecting airtight member is sandwiched between the outer periphery foundation and the foundation insulation member, which prevents the connecting airtight member from loosening or twisting and from coming into contact with surrounding components and being damaged.

[0106] In the insulated and airtight structure of the building, it is preferable that the auxiliary support portion is arranged on the indoor side of the side wall main body so as to form a groove that extends in the vertical direction and opens horizontally to the indoor side, and that the intermediate connection portion has a three-dimensional shape that fits closely to the inner surface of the groove.

[0107] According to the above configuration, the grooves provided in the auxiliary support parts can be used to ensure paths for arranging water supply and drainage pipes, electric cords, etc., while also ensuring airtightness in the grooves.

[0108] A construction method for a thermally insulated and airtight structure according to another aspect of the present invention preferably includes the following steps: a preparation step in which construction of the foundation airtight member is completed in advance, and the connecting airtight member, the side wall airtight member, and a floor panel having the floor member and an underfloor insulation member fixed to the back surface of the floor member are prepared in advance; a connection step in which the side wall airtight member is positioned so as to cover the side wall insulation member from the indoor side and fixed to the indoor side of the side wall main body, and the lower end of the side wall airtight member is connected to the upper end of the foundation airtight member via the connecting airtight member; and a panel installation step in which, after the connection step, the floor panel is installed on the floor support structure so that the intermediate connection portion is sandwiched between the auxiliary support portion and the proximal end of the floor member and between the auxiliary support portion and the underfloor insulation member.

[0109] According to the method, by installing the floor panel, the intermediate connection portion of the connecting airtight member is clamped between the auxiliary support portion and the proximal end of the underfloor member, and between the auxiliary support portion and the underfloor insulation member, respectively. This prevents the connecting airtight member from loosening or twisting. The order in which the side wall airtight member and the connecting airtight member are installed in the connecting process does not matter. That is, the side wall airtight member may be installed after the connecting airtight member, and the side wall airtight member and the foundation airtight member may be connected via the connecting airtight member. Alternatively, the connecting airtight member may be installed after the connecting airtight member, and the side wall airtight member and the foundation airtight member may be connected via the connecting airtight member.

[0110] Other Embodiments Although the heat-insulating airtight structure 100 according to the embodiment of the present invention has been described above, the present invention is not limited to this, and the following embodiments, for example, can be adopted.

[0111] (1) That is, in each of the above embodiments, the building 1 is a wooden building, but this is not limited to this, and it may be, for example, a steel-framed building or a concrete building.

[0112] Fig. 11 is a diagram equivalent to Fig. 1 showing an example of a heat-insulated airtight structure 100 applied to a steel-framed building 1, and Fig. 12 is a perspective view showing a support unit 907 extracted from Fig. 11. In Figs. 11 and 12, the same reference numerals are used for the same components as those in the first embodiment.

[0113] As shown in Figure 11, in a steel-framed building 1, the side wall 9 includes an exterior wall panel 902 arranged in this order from the outdoor side toward the indoor side, a base material 915, a skeleton 901, a heat insulating member 903, and a side wall airtight member 908. The side wall airtight member 908 is composed of an airtight sheet that covers the entire indoor side of the side wall 9. The side wall airtight member 908 is connected to the outer perimeter foundation 2, which serves as a foundation airtight member 20, via a connecting airtight member 16.

[0114] The skeleton 901 is made of C-section steel formed into a frame shape. The skeleton 901 is attached to the upper surface 2a of the perimeter foundation 2 via a plurality of fixing brackets (not shown) arranged at intervals in the depth direction of the building (the direction perpendicular to the paper surface of FIG. 11). The spaces between the fixing brackets are each sealed with a heat insulating material 910.

[0115] The heat insulating member 903 is composed of an upper heat insulating member 903a located above the underfloor material 32 and a lower heat insulating member 903b located below the underfloor material 32. The upper heat insulating member 903a is made of, for example, a fiber-based heat insulating material. The lower heat insulating member 903b is made of, for example, a hard heat insulating material such as extruded polystyrene foam.

[0116] The upper insulation member 903a is supported on the upper surface 2a of the perimeter foundation 2 by a support unit 907. As shown in FIG. 12 , the support unit 907 includes a plurality of seat plates 904 (only three are shown in FIG. 12 ) that form the seat surface of the upper insulation member 903a, a plurality of support blocks 905 (three in FIG. 12 ) that support each of the seat plates 904, and a base plate 906 to which the plurality of support blocks 905 are fixed. The plurality of seat plates 904, the plurality of support blocks 905, and the base plate 906 are fixed to one another with an adhesive or the like to form a single support unit 907. The support block 905 is supported on the upper surface of the perimeter foundation 2 and also functions as an auxiliary support member that supports the proximal end of the underfloor material 32 (the end closer to the side wall 9 than the floor support structure 4).

[0117] The connecting airtight member 16 includes an upper connection portion 16a arranged to overlap the side wall airtight member 908 from the indoor side, a lower connection portion 16b arranged to overlap the indoor side surface 2b of the perimeter foundation 2, and an intermediate connection portion 16c located between the upper connection portion 13a and the lower connection portion 13b and continuously connecting to the upper connection portion 16a and the lower connection portion 16b. The intermediate connection portion 16c has an inverted L-shaped cross section, which is an upside-down L. The intermediate connection portion 16c is formed to engage with two perpendicular surfaces consisting of the upper surface and the indoor side surface of the support block 905. The upper edge of the intermediate connection portion 16c is connected to the lower edge of the upper connection portion 16a. The lower edge of the intermediate connection portion 16c is connected to the upper edge of the lower connection portion 16b. This configuration achieves the same effects as the above-mentioned embodiments.

[0118] (2) In each of the above embodiments, the floor support structure 4 is configured to include the beams 41 and the joists 42, but is not limited to this and may further include, for example, the joists 33. In this case, the floor panel 3 is configured with the floor underlayment material 32 and the floor finishing material 31 without including the joists 33. Note that the joists 33 are not necessarily required, and for example, the joists 33 may be eliminated and the floor underlayment material 32 may be directly supported by the joists 42.

[0119] (3) In addition, in each of the above embodiments, each connecting airtight member 10 to 13 is molded into a predetermined shape in advance, but this is not limited to this. For example, the connecting airtight members 10 to 13 may be made of a soft sheet-like member whose shape is not fixed.

[0120] (4) In addition, in each of the above embodiments, a cushion material 6b is arranged between the basic insulation member 6 and the underfloor insulation member 34 as an extension of the basic insulation member 6, but the cushion material 6b may be eliminated and the upper end surface of the basic insulation member 6 may be abutted against the underside of the underfloor insulation member 34.

[0121] (5) The heat-insulating and airtight structure 100 of the present invention only needs to include at least the basic heat-insulating member 6, the side wall airtight member 96, the basic airtight member 20, and the connecting airtight member 10, and other components are not necessarily required.

Claims

1. A thermally insulated and airtight structure for a building, comprising: a perimeter foundation; side walls supported on the upper surface of the perimeter foundation; floor members located on the indoor side of the side walls; a foundation insulation member covering the indoor side of the perimeter foundation; a side wall airtight member provided on the side walls and covering a room from the outdoor side; a foundation airtight member consisting of either a first airtight member formed by the perimeter foundation or a second airtight member covering the indoor side of the foundation insulation member; and a connecting airtight member extending across and connecting the side wall airtight member and the foundation airtight member, the connecting airtight member having an upper connecting portion connected to the side wall airtight member, a lower connecting portion connected to the foundation airtight member, and an intermediate connecting portion provided between the upper connecting portion and the lower connecting portion and connecting the upper connecting portion to the lower connecting portion continuously and seamlessly.

2. A heat-insulating and airtight structure as described in claim 1, wherein the side wall portion has a side wall portion main body erected on the outer periphery foundation to form a storage chamber, and a side wall portion insulating member provided within the storage chamber, and the side wall portion airtight member is provided on the indoor side of the side wall portion main body so as to cover the side wall portion insulating member from the indoor side.

3. A thermally insulated and airtight structure as described in claim 2, comprising a floor support structure provided indoors of the foundation insulation member and supporting the floor member from below, and an auxiliary support protruding indoors of the side wall main body and connected to the side wall main body or supported on the upper surface of the outer foundation, the auxiliary support supporting the proximal end of the floor member located closer to the side wall than the floor support structure, wherein the intermediate connection part of the connecting airtight member is arranged to pass on the indoor side of the auxiliary support part or between the auxiliary support part and the side wall main body.

4. A heat-insulating and airtight structure according to claim 3, wherein the intermediate connection part is arranged so that a part of the intermediate connection part passes through the indoor side of the auxiliary support part with the part sandwiched between the proximal end part and the auxiliary support part.

5. A heat-insulating and airtight structure according to claim 4, further comprising an underfloor heat-insulating member that is sandwiched between the foundation heat-insulating member and the proximal end portion and that sandwiches a portion of the intermediate connection portion between the foundation heat-insulating member and the auxiliary support portion.

6. A heat-insulating and airtight structure according to claim 3, wherein the intermediate connection portion is sandwiched between the auxiliary support portion and the side wall portion main body, and the lower connection portion is sandwiched between the outer periphery foundation and the foundation insulation member that constitutes the first airtight member.

7. A heat-insulating and airtight structure according to any one of claims 3 to 5, wherein the auxiliary support part is arranged on the indoor side of the side wall main body so as to form a groove that extends in the vertical direction and opens horizontally to the indoor side, and the intermediate connection part has a three-dimensional shape that fits closely to the inner surface of the groove.

8. A construction method for a thermally insulated and airtight structure as defined in claim 5, comprising: a preparation step of completing construction of the foundation airtight member in advance and preparing in advance the connecting airtight member, the side wall airtight member, the floor member, and a floor panel having an underfloor insulation member fixed to the back surface of the floor member; a connection step of arranging the side wall airtight member so as to cover the side wall insulation member from the indoor side and fixing it to the indoor side surface of the side wall main body, and connecting the lower end of the side wall airtight member to the upper end of the foundation airtight member via the connecting airtight member; and a panel installation step of installing the floor panel on the floor support structure after the connection step so that the intermediate connection portion is sandwiched between the auxiliary support portion and the proximal end of the floor member and between the auxiliary support portion and the underfloor insulation member.

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