JP7743886B2 - Heat-insulating and airtight structure and construction method for heat-insulating and airtight structure - Google Patents

Description

The present invention relates to a thermally insulated and airtight structure and a method for constructing such a structure.

A conventionally known heat-insulating and airtight structure for a building is one that includes a foundation insulation member that covers 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, which serves as the airtight member, is placed 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.

Japanese Patent Application Laid-Open No. 2014-221975

Here, airtight members may be installed 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 foundation and discloses airtight packing placed between the perimeter foundation and the foundation, it does not disclose the relationship between the airtight member of the perimeter foundation and the airtight member installed on the side walls.

The objective of the present invention is to provide an insulated and airtight structure and construction method that ensures the thermal insulation of the perimeter foundation while also ensuring the continuity of the airtight line extending from the side wall portion located above the perimeter foundation to the perimeter foundation.

A first invention is a thermally insulated and airtight structure for a building, comprising: a perimeter foundation; a side wall portion supported on an upper surface of the perimeter foundation; a floor member arranged on the indoor side of the side wall portion; a foundation insulation member covering the indoor side of the perimeter foundation; a side wall airtight member provided on the side wall portion 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 the side wall airtight member and the foundation airtight member to connect them, 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, and the side wall portion is the side wall airtight member is provided on the indoor side of the side wall main body so as to cover the side wall insulation member from the indoor side, and has a floor support structure provided indoors of the foundation insulation member and supporting the floor member from below, and an auxiliary support portion that protrudes indoors more than the side wall main body and is connected to the side wall main body or is supported on the upper surface of the outer periphery foundation, and supports a proximal end of the floor member that is located closer to the side wall than the floor support structure portion, and the intermediate connecting portion of the connecting airtight member is arranged to pass through the indoor side of the auxiliary support portion, and the intermediate connecting portion is arranged to pass through the indoor side of the auxiliary support portion with a portion of the intermediate connecting portion sandwiched between the proximal end and the auxiliary support portion .

According to the first invention, the foundation insulation member covering the indoor side of the perimeter foundation ensures thermal insulation in the perimeter foundation, while the side wall 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) from the side wall of the building to the perimeter foundation. That is, in this configuration, the upper connecting portion of the connecting airtight member is connected to the side wall 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. Therefore, the airtight line formed by the side wall airtight member and the airtight line formed by the foundation airtight member can be continuously connected via the connecting airtight member. This ensures thermal insulation in the perimeter foundation of the building while ensuring the continuity of the airtight line from the side wall of the building to the perimeter foundation. Note that "formed continuously and seamlessly" means that one connecting airtight member is itself formed continuously and seamlessly; for example, if multiple connecting airtight members are arranged along the extension direction of the outer perimeter base, there may be seams between each connecting airtight member.

Furthermore, according to the first aspect of the present invention, in winter or in cold regions, it is possible to prevent humid air from entering the side wall heat insulating member on the indoor side of the room, causing condensation.

Furthermore, according to the first aspect of the present invention, the provision of auxiliary support members allows for space-efficient placement of connecting airtight members while improving the vertical deflection strength of the proximal end of the floor member near the side wall. Specifically, when the foundation insulation member is placed on the indoor side of the outer perimeter foundation as in this configuration, the floor support structure must be placed 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 auxiliary support members. 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.

Furthermore, according to the first invention, 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.

The second invention is preferably the same as the first invention, further comprising 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.

According to the second invention, 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.

A third invention is a thermally insulated and airtight structure for a building, comprising: a perimeter foundation; a side wall portion supported on an upper surface of the perimeter foundation; a floor member arranged on the indoor side of the side wall portion; a foundation insulation member covering the indoor side of the perimeter foundation; a side wall airtight member provided on the side wall portion 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 the side wall airtight member and connecting them, 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 connected continuously and seamlessly to the upper connecting portion and the lower connecting portion, and the side wall portion is connected to the outer perimeter foundation so as to form a storage chamber. The structure comprises a side wall main body erected on a peripheral foundation and a side wall insulation member provided within the storage chamber, wherein the side wall airtight member is provided on the indoor side of the side wall main body so as to cover the side wall insulation member from the indoor side, and further comprises a floor support structure provided indoors of the foundation insulation member and supporting the floor member from below, and an auxiliary support portion protruding indoors of the side wall main body and connected to the side wall main body or supported on the upper surface of the peripheral foundation, the auxiliary support portion supporting the proximal end of the floor member located closer to the side wall than the floor support structure portion, and the intermediate connection portion of the connecting airtight member is arranged to pass between the auxiliary support portion and the side wall main body, the intermediate connection portion being sandwiched between the auxiliary support portion and the side wall main body, and the lower connection portion being sandwiched between the peripheral foundation and the foundation insulation member that constitute the first airtight member.

According to the third aspect of the present invention, not only is the intermediate connection portion of the connecting airtight member sandwiched between the auxiliary support portion and the side wall body, but the lower connection portion of the connecting airtight member is sandwiched between the outer periphery foundation and the foundation insulation member, thereby preventing the connecting airtight member from loosening or twisting and from coming into contact with surrounding components and being damaged.

A fourth invention is a thermally insulated and airtight structure for a building, comprising a perimeter foundation, a side wall portion supported on the upper surface of the perimeter foundation, a floor member arranged on the indoor side of the side wall portion, a foundation insulation member covering the indoor side of the perimeter foundation, a side wall airtight member provided on the side wall portion 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 the side wall airtight member and connecting them, 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 connected continuously and seamlessly to the upper connecting portion and the lower connecting portion, and the side wall portion is mounted on the perimeter foundation so as to form a storage chamber. and a side wall insulating member provided within the storage chamber, wherein the side wall airtight member is provided on the indoor side of the side wall main body so as to cover the side wall insulating member from the indoor side, and further comprises a floor support structure provided indoors of the foundation insulating member and supporting the floor member from below, and an auxiliary support portion protruding indoors further than 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 portion supporting a proximal end of the floor member located closer to the side wall than the floor support structure, wherein the intermediate connection portion of the connecting airtight member is arranged to pass through the indoor side of the auxiliary support portion, and the auxiliary support portion is arranged on the indoor side of the side wall main body so as to form a groove that extends vertically and opens horizontally to the indoor side, and the intermediate connection portion has a three-dimensional shape that fits closely to the inner surface of the groove.

According to the fourth aspect of the present invention, the grooves provided in the auxiliary support parts can be used to ensure the placement of water supply and drainage pipes, electrical cords, etc., while also ensuring airtightness in the grooves.

The fifth invention is that, in the first or second invention, the auxiliary support portion is arranged on the indoor side of the side wall portion main body so as to form a groove that extends in the vertical direction and opens horizontally to the indoor side, and it is preferable that the intermediate connection portion has a three-dimensional shape that fits closely to the inner surface of the groove.

According to the fifth aspect of the present invention, the grooves provided in the auxiliary support parts can be used to ensure the placement of water supply and drainage pipes, electrical cords, etc., while also ensuring airtightness in the grooves.

The sixth invention is a construction method for a thermally insulated and airtight structure according to the second invention, which includes a preparation step in which the 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.

According to the sixth aspect of the present invention, when the floor panel is installed, 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 connecting airtight member may be installed after the side wall 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 side wall airtight member, and the side wall airtight member and the foundation airtight member may be connected via the connecting airtight member.

The present invention provides an insulated and airtight structure and construction method that can ensure the continuity of the airtight line from the side wall of the building to the perimeter foundation while ensuring thermal insulation in the perimeter foundation of the building.

1 is a vertical cross-sectional view from the side wall portion of a building to which a heat-insulating airtight structure in embodiment 1 is applied, to the outer periphery foundation. FIG. 2 is a plan view of a corner of the floor panel in the first embodiment, viewed from above. 2 is an enlarged view showing an arrangement location of a connecting airtight member in FIG. 1 . FIG. FIG. 10 is a perspective view showing an example of an assembled state of the connecting airtight member. 3 is a flowchart showing a part of a construction method for a heat-insulating airtight structure in the first embodiment. FIG. 10 is a view corresponding to FIG. 1 and shows a second embodiment. FIG. 7 is an enlarged view showing an arrangement location of the connecting airtight member in FIG. 6 . FIG. 10 is a view corresponding to FIG. 1 and shows a third embodiment. 9 is an enlarged view showing an arrangement location of the connecting airtight member in FIG. 8 . FIG. 10 is a view equivalent to FIG. 4 showing a fourth embodiment. FIG. 11 is a view showing another embodiment. FIG. 12 is a perspective view illustrating the support unit in FIG. 11 .

(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. In this embodiment, an example in which the building 1 is a wooden building is described as an example, but the present invention is not limited thereto. The building 1 may 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.

[Overall structure of the building]
Referring to Figure 1, 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.

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 below). 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 to fill the vertical gap between the underfloor insulation member 34 and the basic insulation member 6. The cushion material 6b is made of an insulating material that is elastically deformable in the vertical direction, and has the function of absorbing any deviation in the vertical installation position of the underfloor insulation member 34 and ensuring the continuity of the insulation line between the basic insulation member 6 and the underfloor insulation member 34.

The earthen floor 5 is made of concrete material that extends horizontally along the ground on the indoor side of the perimeter foundation 2. A top floor insulation member 8 is placed over the entire top surface of the earthen floor 5. In this example, the top floor insulation member 8 is made of a hard insulation material such as extruded polystyrene foam, but it is not limited to this and may also be made of a fiber-based insulation material such as cellulose fiber, rock wool, or glass wool.

[Floor panel configuration]
The plurality of floor panels 3 are arranged adjacent to each other with no 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 member), and a plurality of joists 33 into a single panel.

The underfloor material 32 is a board material that serves as the 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 top surface of the underfloor material 32 with adhesive, nails, etc. The underfloor material 32 is fixed to the top surface of a plurality of joists 33. The plurality of joists 33 are prism members with a rectangular cross section that extend in the depth direction of the building (perpendicular to the plane of the paper in Figure 1) and are arranged at intervals (equally spaced in this example) from one another in the width direction of the building (left-right direction in Figure 1).

The multiple floor panels 3 are then placed on top of the joists 42 of the floor support structure 4, which will be described later. Of the multiple floor panels 3, the floor panel 3 located adjacent to the side wall 9 of the building 1 further has an underfloor insulation member 34 (see Figure 2).

Figure 2 is a plan view of the corner of a floor panel 3 having this underfloor insulation member 34, viewed from above. For ease of viewing, the floor finishing material 31 and underfloor material 32 located above the joists 33 are shown with imaginary lines (chain double-dashed lines) in this figure.

As shown in this figure, the floor panel 3 has a plurality of first underfloor insulation members 34a and second underfloor insulation members 34b as underfloor insulation members 34. The first underfloor insulation members 34a are respectively arranged between the ends of the plurality of common joists 33. The upper surface of each first underfloor insulation member 34a is fixed in abutment against the lower surface of the underfloor material 32. The second underfloor insulation member 34b extends along the side of the outermost common joist 33 over its entire longitudinal direction (transverse to the depth of the building). The upper surface of the second underfloor insulation 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 insulation members 34a and the second underfloor insulation members 34b, they will simply be referred to as underfloor insulation members 34.

As shown in FIG. 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 the peripheral portion of the underfloor material 32 that runs along the side wall portion 9.

[Configuration of 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 of which is shown in Figure 1) protruding from the upper surface of the earthen floor 5, and a plurality of joists 42 (only one of which is shown in Figure 1) supported from below by the plurality of beams 41.

The multiple joists 42 are each composed of square timbers with a rectangular cross section that extend across the width of the building (left-right in Figure 1), and are spaced apart (equally spaced in this example) across the depth of the building (perpendicular to the plane of Figure 1). The multiple joists 42 are thus arranged 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.

[Configuration of side wall portion]
The side wall 9 is disposed on the upper surface of the perimeter foundation 2 along its extension direction (in the example of Figure 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).

The exterior wall panels 92 are components that form the exterior wall surfaces of the building 1 and extend in the vertical direction. The exterior wall panels 92 are positioned slightly outward from the outer insulation members 93.

The outer insulating member 93 is placed 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 aforementioned fiber-based insulating material.

The base material 94 is arranged 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 skeleton of the side wall portion 9. In this example, this frame 98 has a base 97 consisting of a cross beam that extends along the upper surface of the perimeter foundation 2 in its extension direction (in the example of Figure 1, the depth direction of the building, 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, an upper cross beam (e.g., eaves beam) that connects the upper ends of the pair of main columns, and multiple intermediate columns 99 (e.g., partition columns and half columns; see Figure 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.

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

The side wall airtight member 96 is fixed to the indoor side of the frame 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.

The base 97, which forms the lower end of the frame 98, is fixed to the upper surface 2a of the outer periphery foundation 2 by multiple fixing brackets (not shown) interposed between its underside and the outer periphery foundation 2. The multiple fixing brackets are arranged at intervals along the length 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 multiple insulating materials 7a. The multiple insulating materials 7a are respectively arranged in the spaces between the multiple fixing brackets. The multiple insulating materials 7a constitute the foundation upper surface insulating members 7 described below. 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 mentioned above.

The auxiliary support portion 91 is formed 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 rectangular cross-section timber (base wood) that extends longitudinally (perpendicular to the plane of the paper in Figure 1) along the indoor side of the base 97 of the side wall main body 90, and is fixed to the base 97 with screws, adhesive, or the like. The auxiliary support portion 91 may also be formed integrally with the side wall main body 90.

[Interior panel configuration]
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 indoor ceiling surface. The lower end surface of the interior panel 15 abuts against a proximal end of a floor finishing material 31 provided on the floor panel 3, which is located closer to the side wall 9 than the floor support structure 4 .

[Details of the heat-insulating and airtight structure]
Next, a thermally insulated and airtight structure 100 for a building 1 according to this embodiment will be described with reference to Fig. 1. While 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, a similar thermally insulated and airtight structure is also applied in the depth direction of the building. In the following, for the sake of simplicity, only the thermally insulated and airtight structure 100 in the width direction of the building will be described.

The heat-insulating and airtight structure 100 is constructed by combining a heat-insulating structural section and an airtight structural section.

The thermal insulation structure includes the aforementioned 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.

The airtight structure includes a side wall airtight member 96, a base airtight member 20, and a connecting airtight member 10.

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 of the side wall 9. The side wall airtight member 96 is fixed with staples, tape, etc. to the indoor side 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.

In this example, the foundation airtight member 20 is made up of the perimeter foundation 2 itself. Because the perimeter foundation 2 is made of concrete, it has airtightness in both the interior and exterior directions of the building (in the example of Figure 1, the width direction of the building).

The connecting airtight member 10 extends across the side wall airtight member 96 and the base airtight member 20, connecting them together. The connecting airtight member 10 is composed 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.

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

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

The upper connection portion 10a is a rectangular plate extending in the depth direction of the building and is positioned so as to overlap the lower end of the side wall airtight member 96 (see Figure 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 with an adhesive surface on one side is positioned, for example, to cover the boundary between the upper edge of the upper connection portion 10a and the indoor side of the side wall airtight member 96. An airtight tape with adhesive surfaces on both sides is positioned, for example, at the overlapping surface between the upper connection portion 10a and the side wall airtight member 96.

The lower connection part 10b is a rectangular plate extending in the depth direction of the building and is positioned so as to abut against the foundation top surface insulation member 7 and the perimeter 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 part 10b is fixed by being sandwiched between the foundation top surface insulation member 7 and the cushion material 6b. The lower end of the lower connection part 10b is fixed by being sandwiched between the perimeter foundation 2 and the foundation insulation member 6. The lower connection part 10b may also be fixed to the indoor side surface 2b of the perimeter foundation 2 using airtight tape or the like.

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.

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

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

[Details of construction method for heat-insulated airtight structure]
Next, steps S1 to S5 related to the assembly procedure of the connecting airtight member 10 will be described in the construction method of the heat-insulated airtight structure 100. 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 is completed.

As shown in this diagram, steps S1 to S5 involved in the assembly procedure for 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 steps S1 to S5 are performed may be changed as appropriate, provided that this is physically possible.

Preparation process S1 is a process in which the construction of the foundation airtight member 20 is completed in advance before the assembly of the connecting airtight member 10 (see Figure 3), and the connecting airtight member 10, side wall airtight member 96, and floor panel 3 are prepared in advance. In this example, the foundation airtight member 20 is composed of the foundation 2 itself, so construction of the foundation airtight member 20 is completed simultaneously with construction of the foundation 2.

The base board installation process S2 is a process of fixing the base board that constitutes the auxiliary support portion 91 (see Figure 3) to the indoor side of the base 97, which is the lower edge of the frame body 98. Specifically, in the base board installation process S2, the base board is placed along the indoor side of the base 97 and fixed to the base 97 using nails or the like.

The connecting step S3 is a step of positioning the sidewall airtight member 96 so that it covers the inner insulating member 95 (an example of a sidewall insulating member) from the indoor side and fixing it to the indoor side of the sidewall main body 90, and connecting the lower end of the sidewall airtight member 96 (see Figure 3) to the upper end of the outer perimeter foundation 2, which is the foundation airtight member 20, using the connecting airtight member 10. Specifically, in the connecting step S3, the airtight sheet that constitutes the sidewall airtight member 96 is first positioned over the entire indoor side of the sidewall 9 from the top to the bottom, and the airtight sheet is fixed to the frame 98, which forms the skeleton of the sidewall main body 90, with staples, tape, or the like. Next, in the connecting step S3, the connecting airtight member 10 is engaged 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. The upper connecting portion 10a of the connecting airtight member 10 is then positioned so that it overlaps 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. The lower connecting portion 10b of the connecting airtight member 10 is then positioned so that it abuts 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.

The first post-connection process S4 is a process of sandwiching and fixing the lower connection portion 10b of the connecting airtight member 10 between the basic insulation member 6 and the peripheral foundation 2 by installing the insulation material that constitutes the basic insulation member 6 (see Figure 3). Specifically, the insulation material that constitutes the basic insulation member 6 is pressed against the indoor side surface 2b of the peripheral foundation 2 and fixed with an adhesive or the like. This sandwiches and fixes the lower connection portion 10b of the connecting airtight member 10 between the basic insulation member 6 and the peripheral foundation 2.

The second post-connection process S5 involves installing the floor panel 3 (see Figures 1 and 3) with the underfloor insulation member 34 at a predetermined position above the joists 42 of the floor support structure 4 (a pre-determined 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 foundation 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 foundation insulation member 6, and is slightly compressed in the vertical direction. As a result, even if there is a misalignment in the height of the floor panel 3, that misalignment is absorbed by the cushion material 6b.

[Action and effect]
As described above, the insulated airtight structure 100 of this embodiment 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 constituted by the peripheral foundation 2 itself, and a connecting airtight member 10 extending across the side wall airtight member 96 and the peripheral 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.

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 components—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. Therefore, 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. This ensures thermal insulation in the perimeter foundation 2 of the building 1 while ensuring the continuity of the airtight line from the sidewall 9 of the building 1 to the perimeter foundation 2.

In this embodiment, the side wall 9 comprises a side wall 9 main body erected on the outer periphery foundation 2 to form the storage chamber R, and an inner insulating member 95 provided within the storage chamber R, and a side wall airtight member 96 provided on the indoor side of the side wall 9 main body to cover the inner insulating member 95 from the indoor side.

This configuration prevents humid air from entering the interior of the room and causing condensation in winter or in cold regions.

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 91 that is located on the indoor side of the side wall main body 90, between a proximal end of the floor underlayment 32 that is closer to the side wall 9 than the floor support structure 4 and the upper surface of the outer perimeter foundation 2 and supports the proximal end, and the intermediate connection portion 10c of the connecting airtight member 10 is positioned so as to pass on the indoor side of the auxiliary support 91 or between the auxiliary support 91 and the side wall main body 90.

This configuration allows the auxiliary support portion 91 to be provided, improving the vertical flexural strength of the proximal end of the underfloor material 32 near the sidewall portion 9 while efficiently positioning the connecting airtight member 10. In other words, 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 flexural rigidity at the proximal end of the underfloor material 32. In contrast, this configuration prevents a decrease in flexural rigidity at the proximal end of the underfloor material 32 by supporting the proximal end of the underfloor material 32 with the auxiliary support portion 91. 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), allowing the connecting airtight member 10 to be positioned space-efficiently without interfering with the auxiliary support portion 91.

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

With this configuration, a portion of the intermediate connection portion 10c of the connecting airtight member 10 is sandwiched between the proximal end of the underfloor material 32 and the auxiliary support portion 91, 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 becoming damaged.

In this embodiment, the thermally insulated 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 positioned so that a portion of the intermediate connection portion 10c of the connecting airtight member 10 is sandwiched between the auxiliary support portion 91.

With this configuration, a portion of the intermediate connection portion 10c of the connecting airtight member 10 is sandwiched between the auxiliary support portion 91 and the underfloor insulation member 34, 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 becoming damaged.

The construction method for the insulated and airtight structure 100 in this embodiment also includes a preparation step 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 step S3 in which the side wall airtight member 96 is positioned 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 is connected to the upper end of the foundation airtight member 20 via the connecting airtight member 10; and a second post-connection step (panel installation step) in which, after the connection step 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.

With 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.

In this embodiment, in the connecting step S3, the side wall airtight member 96 is placed first, followed by the connecting airtight member 10, which then connects the side wall airtight member 96 to the foundation airtight member 20. However, this is not limited to this, and the side wall airtight member 96 may be placed first, followed by the connecting airtight member 10, which then connects the side wall airtight member 96 to the foundation airtight member 20. In other words, the order in which the side wall airtight member 96 and the connecting airtight member 10 are installed in the connecting step S3 does not matter.

(Embodiment 2)
Fig. 6 is a diagram equivalent to Fig. 1 showing embodiment 2, and Fig. 7 is an enlarged view showing the location of the connecting airtight member 11 in Fig. 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.

In other words, whereas in the first embodiment, the foundation airtight member 20 is composed of the outer perimeter foundation 2, in this embodiment, the foundation airtight member 20 is composed of 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 composed of, for example, a resin airtight sheet, polystyrene foam, phenol foam, etc.

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

Specifically, as shown in Figure 7, the connecting airtight member 11 has an upper connection portion 11a, a lower connection portion 11b, and an intermediate connection portion 11c.

The upper connection portion 11a is a rectangular plate extending in the depth direction of the building and is positioned so that it overlaps 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.

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 positioned 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.

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 protruding side end surface 91b of the auxiliary support portion 91, and an indoor 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 edge) of the indoor extension portion 11e is connected to the upper edge of the lower connection portion 11b.

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 the 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. Meanwhile, the indoor extension 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.

[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.

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 prevents 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.

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

In other words, in the first embodiment, the connecting airtight member 10 is arranged to pass through the indoor side of the auxiliary support part 91, whereas in this embodiment, the connecting airtight member 12 is arranged to pass through the outdoor side of the auxiliary support part 91 (in this example, between the auxiliary support part 91 and the base 97).

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

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 in embodiment 1. 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.

Like the lower connection part 11b in embodiment 1, the lower connection part 12b is positioned so as to overlap the indoor side surface 2b of the perimeter foundation 2, which is the foundation airtight member 20. The lower connection part 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.

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 leading 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.

[Action and effect]
In this embodiment, the insulated airtight structure 100 is equipped 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 connected continuously and seamlessly to the upper connection portion 12a and the lower connection portion 12b, thereby achieving the same effects as in embodiment 1.

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

This configuration allows for a simpler shape of the connecting airtight member 10 than when the connecting airtight member 12 passes through the indoor side of the auxiliary support portion 91. In other words, there is no need to bend the connecting airtight member 12 in a complex manner to avoid interference with components located on the indoor side of the auxiliary support portion 91 (such as the floor panel 3 or basic insulation member 6). Therefore, the shape of the connecting airtight member 12 can be simplified, reducing manufacturing costs.

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

With 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 insulation member 6, preventing loosening and twisting of the connecting airtight member 12. This prevents the connecting airtight member 12 from coming into contact with surrounding components and being damaged.

(Embodiment 4)
10 is a view equivalent to FIG. 4 showing a fourth embodiment. This embodiment differs from the first embodiment 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 that of the first embodiment is attached to the portion of the auxiliary support part 91 other than the groove K.

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

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

The upper connection portion 13a is a rectangular plate extending in the depth direction of the building and is positioned 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 non-ventilable manner.

The lower connection portion 13b is a rectangular plate extending in the depth direction of the building, extending vertically 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 to prevent air from passing through.

In the groove K, the intermediate connection portion 13c is formed so as to fit closely to the wall surface of the groove K. The intermediate connection portion 13c has a three-dimensional shape that corresponds to the shape of the inner wall surface of the groove K. Specifically, the intermediate connection 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.

[Action and effect]
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.

This configuration allows the groove K provided in the auxiliary support portion 91 to be used to ensure a routing path for electrical cords, etc., while also ensuring airtightness in the groove K.

Note that the specific embodiments described above primarily include inventions with the following configurations:

A first invention is a thermally insulated and airtight structure for a building, comprising: a perimeter foundation; a side wall portion supported on an upper surface of the perimeter foundation; a floor member arranged on the indoor side of the side wall portion; a foundation insulation member covering the indoor side of the perimeter foundation; a side wall airtight member provided on the side wall portion 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 the side wall airtight member and the foundation airtight member to connect them, 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, and the side wall portion is the side wall airtight member is provided on the indoor side of the side wall main body so as to cover the side wall insulation member from the indoor side, and has a floor support structure provided indoors of the foundation insulation member and supporting the floor member from below, and an auxiliary support portion that protrudes indoors more than the side wall main body and is connected to the side wall main body or is supported on the upper surface of the outer periphery foundation, and supports a proximal end of the floor member that is located closer to the side wall than the floor support structure portion, and the intermediate connecting portion of the connecting airtight member is arranged to pass through the indoor side of the auxiliary support portion, and the intermediate connecting portion is arranged to pass through the indoor side of the auxiliary support portion with a portion of the intermediate connecting portion sandwiched between the proximal end and the auxiliary support portion .

The second invention is preferably the same as the first invention, further comprising 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.

A third invention is a thermally insulated and airtight structure for a building, comprising: a perimeter foundation; a side wall portion supported on an upper surface of the perimeter foundation; a floor member arranged on the indoor side of the side wall portion; a foundation insulation member covering the indoor side of the perimeter foundation; a side wall airtight member provided on the side wall portion 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 the side wall airtight member and connecting them, 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 connected continuously and seamlessly to the upper connecting portion and the lower connecting portion, and the side wall portion is connected to the outer perimeter foundation so as to form a storage chamber. The structure comprises a side wall main body erected on a peripheral foundation and a side wall insulation member provided within the storage chamber, wherein the side wall airtight member is provided on the indoor side of the side wall main body so as to cover the side wall insulation member from the indoor side, and further comprises a floor support structure provided indoors of the foundation insulation member and supporting the floor member from below, and an auxiliary support portion protruding indoors of the side wall main body and connected to the side wall main body or supported on the upper surface of the peripheral foundation, the auxiliary support portion supporting the proximal end of the floor member located closer to the side wall than the floor support structure portion, and the intermediate connection portion of the connecting airtight member is arranged to pass between the auxiliary support portion and the side wall main body, the intermediate connection portion being sandwiched between the auxiliary support portion and the side wall main body, and the lower connection portion being sandwiched between the peripheral foundation and the foundation insulation member that constitute the first airtight member.

A fourth invention is a thermally insulated and airtight structure for a building, comprising a perimeter foundation, a side wall portion supported on the upper surface of the perimeter foundation, a floor member arranged on the indoor side of the side wall portion, a foundation insulation member covering the indoor side of the perimeter foundation, a side wall airtight member provided on the side wall portion 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 the side wall airtight member and connecting them, 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 connected continuously and seamlessly to the upper connecting portion and the lower connecting portion, and the side wall portion is mounted on the perimeter foundation so as to form a storage chamber. and a side wall insulating member provided within the storage chamber, wherein the side wall airtight member is provided on the indoor side of the side wall main body so as to cover the side wall insulating member from the indoor side, and further comprises a floor support structure provided indoors of the foundation insulating member and supporting the floor member from below, and an auxiliary support portion protruding indoors further than 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 portion supporting a proximal end of the floor member located closer to the side wall than the floor support structure, wherein the intermediate connection portion of the connecting airtight member is arranged to pass through the indoor side of the auxiliary support portion, and the auxiliary support portion is arranged on the indoor side of the side wall main body so as to form a groove that extends vertically and opens horizontally to the indoor side, and the intermediate connection portion has a three-dimensional shape that fits closely to the inner surface of the groove.

The fifth invention is that, in the first or second invention, the auxiliary support portion is arranged on the indoor side of the side wall portion main body so as to form a groove that extends in the vertical direction and opens horizontally to the indoor side, and it is preferable that the intermediate connection portion has a three-dimensional shape that fits closely to the inner surface of the groove.

The sixth invention is a construction method for a thermally insulated and airtight structure according to the second invention, and preferably includes the following steps: a preparation step in which the 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.

(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 embodiment, for example, can be adopted.

(1) In other words, in each of the above embodiments, the building 1 is described as being a wooden building, but this is not limited to this and may be, for example, a steel-framed building or a concrete building.

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

As shown in Figure 11, in a steel-framed building 1, the side wall 9 comprises an exterior wall panel 902, a base material 915, a frame 901, a heat insulating member 903, and a side wall airtight member 908, arranged in this order from the outdoor side to the indoor side. 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 the foundation airtight member 20, via a connecting airtight member 16.

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 outer perimeter foundation 2 via multiple fixing brackets (not shown) arranged at intervals in the depth direction of the building (perpendicular to the plane of the paper in Figure 11). The spaces between the multiple fixing brackets are each sealed with insulating material 910.

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

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 multiple seat plates 904 (only three are shown in FIG. 12) that form the seating surface of the upper insulation member 903a, multiple support blocks 905 (three in FIG. 12) that support each seat plate 904, and a base plate 906 to which the multiple support blocks 905 are fixed. The multiple seat plates 904, the multiple support blocks 905, and the base plate 906 are fixed to each other with 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 floor underlayment 32 (the end closer to the side wall 9 than the floor support structure 4).

The connecting airtight member 16 has 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, with the L-shape turned upside down. 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 previous embodiments.

(2) In each of the above embodiments, the floor support structure 4 is configured to include beams 41 and joists 42, but this is not limited to this and may further include, for example, joists 33. In this case, the floor panel 3 is configured from 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; for example, the joists 33 may be eliminated and the floor underlayment material 32 may be directly supported by the joists 42.

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

(4) Furthermore, in each of the above embodiments, cushion material 6b is placed between the basic insulation member 6 and the underfloor insulation member 34 as an extension of the basic insulation member 6. However, 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.

(5) The heat-insulating and airtight structure 100 of the present invention is sufficient 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; other components are not necessarily required.

K: Groove R: Space (container)
1: Building 2: Periphery foundation (foundation airtight member, first airtight member)
2a: Upper surface 3: Floor panel 4: Floor support structure 6: Foundation heat insulating member 6b: Cushion material (foundation heat insulating member)
9: Side wall portion 10: Connecting airtight member 10a: Upper connecting portion 10b: Lower connecting portion 10c: Intermediate connecting portion 11: Connecting airtight member 11a: Upper connecting portion 11b: Lower connecting portion 11c: Intermediate connecting portion 12: Connecting airtight member 12a: Upper connecting portion 12b: Lower connecting portion 12c: Intermediate connecting portion 13: Connecting airtight member 13a: Upper connecting portion 13b: Lower connecting portion 13c: Intermediate connecting portion 16a: Upper connecting portion 16b: Lower connecting portion 16c: Intermediate connecting portion 20: Foundation airtight member 21: Urethane layer (foundation airtight member, second airtight member)
3 2: Floor underlayment (floor component)
34: Underfloor heat insulating member 90: Side wall main body 91: Auxiliary support portion 94: Inner heat insulating member (side wall heat insulating member)
96: Side wall airtight member 100: Heat-insulating airtight structure 908: Side wall airtight member

Claims (6)

A thermally insulated and airtight structure of a building,
Perimeter foundation and
A side wall portion supported on the upper surface of the outer periphery foundation;
a floor member disposed on the indoor side of the side wall portion;
A foundation insulation member covering the indoor side of the outer 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 outer periphery foundation or a second airtight member covering the indoor side of the foundation insulation member;
a connecting airtight member that extends across the side wall airtight member and the basic airtight member to connect them together,
The connecting airtight member has an upper connection portion connected to the side wall airtight member, a lower connection portion connected to the basic airtight member, and an intermediate connection portion provided between the upper connection portion and the lower connection portion and continuously and seamlessly connected to the upper connection portion and the lower connection portion ,
The side wall portion includes a side wall portion main body erected on the outer periphery foundation so as to form a storage chamber, and a side wall portion heat insulating member provided within the storage chamber,
the side wall airtight member is provided on the indoor side surface of the side wall main body so as to cover the side wall heat insulating member from the indoor side,
a floor support structure provided indoors relative to the basic insulation member and supporting the floor member from below;
and an auxiliary support portion that protrudes indoors beyond the side wall portion main body and is connected to the side wall portion main body or is supported on the upper surface of the outer periphery foundation, and supports a proximal end portion of the floor member that is located closer to the side wall portion than the floor support structure portion,
The intermediate connection portion of the connecting airtight member is arranged to pass through the indoor side of the auxiliary support portion,
An insulated and airtight structure, wherein 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 . The heat-insulating and airtight structure according to claim 1 ,
An insulated and airtight structure further comprising an underfloor insulation member sandwiched between the basic insulation member and the proximal end portion and sandwiching a portion of the intermediate connection portion between the basic insulation member and the auxiliary support portion. A thermally insulated and airtight structure of a building,
Perimeter foundation and
A side wall portion supported on the upper surface of the outer periphery foundation;
a floor member disposed on the indoor side of the side wall portion;
A foundation insulation member covering the indoor side of the outer 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 outer periphery foundation or a second airtight member covering the indoor side of the foundation insulation member;
a connecting airtight member that extends across the side wall airtight member and the basic airtight member to connect them together,
The connecting airtight member has an upper connection portion connected to the side wall airtight member, a lower connection portion connected to the basic airtight member, and an intermediate connection portion provided between the upper connection portion and the lower connection portion and continuously and seamlessly connected to the upper connection portion and the lower connection portion,
The side wall portion includes a side wall portion main body erected on the outer periphery foundation so as to form a storage chamber, and a side wall portion heat insulating member provided within the storage chamber,
the side wall airtight member is provided on the indoor side surface of the side wall main body so as to cover the side wall heat insulating member from the indoor side,
a floor support structure provided indoors relative to the basic insulation member and supporting the floor member from below;
and an auxiliary support portion that protrudes indoors beyond the side wall portion main body and is connected to the side wall portion main body or is supported on the upper surface of the outer periphery foundation, and supports a proximal end portion of the floor member that is located closer to the side wall portion than the floor support structure portion,
the intermediate connection portion of the connecting airtight member is disposed so as to pass between the auxiliary support portion and the side wall portion main body,
the intermediate connection portion is sandwiched between the auxiliary support portion and the side wall portion main body,
An insulated and airtight structure, wherein the lower connection portion is sandwiched between the outer periphery foundation and the foundation insulation member that constitute the first airtight member. A thermally insulated and airtight structure of a building,
Perimeter foundation and
A side wall portion supported on the upper surface of the outer periphery foundation;
a floor member disposed on the indoor side of the side wall portion;
A foundation insulation member covering the indoor side of the outer 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 outer periphery foundation or a second airtight member covering the indoor side of the foundation insulation member;
a connecting airtight member that extends across the side wall airtight member and the basic airtight member to connect them together,
The connecting airtight member has an upper connection portion connected to the side wall airtight member, a lower connection portion connected to the basic airtight member, and an intermediate connection portion provided between the upper connection portion and the lower connection portion and continuously and seamlessly connected to the upper connection portion and the lower connection portion,
The side wall portion includes a side wall portion main body erected on the outer periphery foundation so as to form a storage chamber, and a side wall portion heat insulating member provided within the storage chamber,
the side wall airtight member is provided on the indoor side surface of the side wall main body so as to cover the side wall heat insulating member from the indoor side,
a floor support structure provided indoors relative to the basic insulation member and supporting the floor member from below;
and an auxiliary support portion that protrudes indoors beyond the side wall portion main body and is connected to the side wall portion main body or is supported on the upper surface of the outer periphery foundation, and supports a proximal end portion of the floor member that is located closer to the side wall portion than the floor support structure portion,
The intermediate connection portion of the connecting airtight member is arranged to pass through the indoor side of the auxiliary support portion,
the auxiliary support portion is disposed on the indoor side of the side wall main body so as to form a groove extending in the vertical direction and opening to the indoor side in the horizontal direction,
The intermediate connection portion has a three-dimensional shape that fits closely to the inner surface of the groove. The heat-insulating and airtight structure according to claim 1 or 2,
the auxiliary support portion is disposed on the indoor side of the side wall main body so as to form a groove extending in the vertical direction and opening to the indoor side in the horizontal direction,
The intermediate connection portion has a three-dimensional shape that fits closely to the inner surface of the groove. 3. A method for constructing a heat-insulating and airtight structure according to claim 2 ,
A preparation process in which the construction of the foundation airtight member is completed in advance, and 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 are prepared in advance;
a connecting step of fixing the side wall airtight member to the indoor side surface of the side wall main body so as to cover the side wall heat insulating member from the indoor side, 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;
A construction method for a thermally insulated and airtight structure, comprising: a panel installation process of installing the floor panel on the floor support structure after the connecting process so that the intermediate connection portion is sandwiched between the auxiliary support portion and the proximal end portion of the floor member and between the auxiliary support portion and the underfloor insulation member.