Airtight structure of buildings

Abstract

To simplify the installation work of airtight members at the joint between an opening and a floor material. [Solution] The airtight structure 1 of a building comprises an opening forming member that forms an opening A1 surrounded by a pair of horizontal surfaces and a pair of vertical surfaces facing horizontally, a floor support member 4d having a support surface 4d1 for supporting a floor material 5 and attached so that the support surface 4d1 is positioned below the upper surface 3a3a of a height adjustment member 3a3, and a second airtight member 7b having a second horizontally positioned portion 7ba that is positioned along the upper surface 3a3a, a second lower inner surface positioned portion 7bb that extends downward from the indoor side edge of the horizontally positioned portion 7ba and is positioned along the lower inner surface 3a3b, and a second support surface positioned portion 7bc that extends from the lower edge of the lower inner surface positioned portion 7bb toward the room and is positioned along the support surface 4d1.

Description

[Technical Field]

[0001] The present invention relates to an airtight structure in a building. [Background technology]

[0002] BACKGROUND ART For example, an airtight structure as described in Patent Document 1 has been known in the past.

[0003] The airtight structure described in Patent Document 1 includes a wall and an airtight sheet attached to the wall. The wall has an opening that opens in a predetermined direction and has a corner when viewed along the predetermined direction, an enclosing surface that surrounds the opening, and an outer surface that extends from one end of the enclosing surface in the predetermined direction away from the opening. The airtight sheet has predetermined fold lines that form a portion that follows one side of the corner of the enclosing surface, a portion that follows the other side of the corner, and a portion that follows the outer surface.

[0004] According to the airtight structure described in Patent Document 1, by folding the airtight sheet along the fold line, the airtight sheet can be provided continuously on one side and the other side of the corner, and further from these sides to the outer surface. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-108310 Summary of the Invention [Problem to be solved by the invention]

[0006] An opening in a wall may be fitted with fittings, and when a French window is installed, for example, the structure at the interface between the bottom of the French window and the flooring becomes complex.

[0007] Therefore, when adopting a configuration in which the airtight sheet is folded at a predetermined fold line as described in Patent Document 1, the number of folding points and folding directions increases, which poses a problem in that the installation work of the airtight sheet becomes complicated.

[0008] An object of the present invention is to provide an airtight structure for a building that can simplify the installation work of airtight members at the joint between an opening and a floor material. [Means for solving the problem]

[0009] In order to solve the above problems, the first invention provides an airtight structure for a building, comprising: an opening-forming member that forms an opening surrounded by a pair of horizontal surfaces that face vertically and a pair of vertical surfaces that face horizontally; a floor support member that has a support surface for supporting a floor material and is attached to the opening-forming member so that the support surface is positioned below the lower horizontal surface that is the lower of the pair of horizontal surfaces; a horizontal placement portion that is positioned along the lower horizontal surface; a lower inner surface placement portion that extends downward from the interior-side edge of the horizontal placement portion and extends downward from the interior-side edge of the lower horizontal surface of the opening-forming member and is positioned along the lower inner surface facing the room; and a support surface placement portion that extends from the lower edge of the lower inner surface placement portion toward the room and is positioned along the support surface.

[0010] In the present invention, at the joint between the floor support member and the floor surface material, the support surface is positioned below the lower horizontal plane, thereby forming a step between the opening-forming member and the floor support member for fitting the floor surface material. In this configuration, to create an airtight state from the opening-forming member to the floor support member, it is necessary to form an airtight line along a path from the lower horizontal plane, the surface of the opening-forming member facing the room, and the support surface. In the present invention, the airtight member has a shape that can be placed along the path of the airtight line, thereby simplifying the installation work of the airtight member to form an airtight line at the joint between the floor support member and the floor surface material.

[0011] The airtight structure of the building of the first invention further comprises a fixture attached to the opening-forming member from the outside of the room so as to be fitted into the opening, and it is preferable that the airtight member has a fixture placement section that extends upward from the outside edge of the horizontal placement section and is positioned along the surface of the fixture facing inside the room (second invention).

[0012] According to the second aspect of the present invention, since the airtight member has a fitting placement portion, it is possible to easily form a continuous airtight line from the fitting to the floor support member.

[0013] In an airtight structure for a building according to the second invention, the floor surface material has a lower surface material placed on the support surface and an upper surface material placed on the lower surface material so as to cover the lower surface material and the lower horizontal surface, and it is preferable that the vertical height dimension of the lower inner surface of the opening-forming member is set to a dimension equivalent to the thickness dimension of the lower surface material (third invention).

[0014] According to the third aspect of the present invention, the vertical dimension of the lower inner surface is set to a dimension equivalent to the thickness dimension of the lower surface material, so that by placing the lower surface material on a support surface, the upper surface of the lower surface material and the lower horizontal surface (the horizontally disposed portion of the airtight member) can be arranged on the same plane. By stacking an upper surface material on these lower surface material and lower horizontal surface, the airtight member can be covered to finish the floor surface.

[0015] In the airtight structure of a building according to the third invention, it is preferable that the building fixture has a covering portion attached to the opening-forming member with a vertical gap corresponding to the thickness dimension of the upper surface material formed between the upper surface material and the lower horizontal surface in order to cover the outdoor edge of the upper surface material from above (fourth invention).

[0016] According to the fourth invention, the airtight member can be covered by placing an upper surface material, and further, the edge of this upper surface material on the outdoor side can be covered with a covering portion so that the edge of the upper surface material can be contained within the fixture.

[0017] In the airtight structure of a building according to the third or fourth invention, it is preferable that the lower inner surface of the opening-forming member is arranged on the same plane as a lateral inner surface of the opening-forming member that extends horizontally from the lower inner surface beyond one vertical surface and faces the interior of the room (fifth invention).

[0018] According to the fifth aspect of the present invention, the lower and lateral inner surfaces of the opening-forming member are arranged on the same plane, so that the edge of the lower floor material on the outdoor side can be made straight, simplifying the shape of the lower floor material. This allows the lower floor material to be shared with floor materials installed in locations other than fittings in the building.

[0019] It is preferable that the airtight structure of a building of any one of the first to fifth inventions further comprises a foundation on which the opening-forming member is placed and which supports the opening-forming member, and that the airtight member has a foundation connection portion which extends downward from the interior-side edge of the support surface arrangement portion and is connected to the surface of the foundation facing the interior of the room (sixth invention).

[0020] According to the sixth aspect of the present invention, since the airtight member has a foundation connection portion, it is possible to easily form a continuous airtight line from the fixture to the foundation.

[0021] In an airtight structure for a building according to any one of the first to sixth inventions, the airtight member has a vertically-positioned portion that extends upward from an edge of the horizontally-positioned portion that is close to one of the pair of vertical surfaces and is arranged along the one vertical surface, and a horizontally-positioned inner surface portion that extends horizontally from an edge of the vertically-positioned portion on the indoor side and that extends horizontally from the lower inner surface of the opening-forming member beyond the one vertical surface and is arranged along the horizontal inner surface facing the room, and it is preferable that the lower inner surface portion has a lower inner surface main body portion connected to the horizontally-positioned portion and a lower inner surface extension portion that extends horizontally from the lower inner surface main body portion and is connected to the horizontally-positioned portion, and the support surface portion has the support surface main body portion connected to the lower inner surface portion and a support surface extension portion that extends horizontally from the support surface main body portion and is connected to the lower inner surface extension portion (seventh invention).

[0022] According to the seventh invention, since the airtight member has a vertically arranged portion, a horizontal inner surface arranged portion, a lower inner surface extension portion, and a support surface extension portion, the airtight member can be easily arranged over the opening and an area horizontally offset from the opening. [Effects of the Invention]

[0023] According to the present invention, the installation work of an airtight member at the joint between an opening and a floor surface material can be simplified. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a perspective, partially cross-sectional view showing a portion of the airtight structure of a building according to the present invention cut out and with the surface material disassembled. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] 2 is an exploded perspective view of the airtight member in the airtight structure of FIG. 1. FIG. [Figure 5] FIG. 5 is an enlarged perspective view of the corner airtight member of FIG. 4. [Figure 6] 5 is an enlarged and exploded perspective view of the opening airtight member of FIG. 4. FIG. [Figure 7] 2 is a cross-sectional view showing a procedure for constructing the airtight structure of FIG. 1, showing the state before the airtight member is attached. [Figure 8] 2 is a cross-sectional view showing a procedure for constructing the airtight structure of FIG. 1, showing a state in which an airtight member for an opening is attached. [Figure 9] 2 is a cross-sectional view showing a procedure for installing the airtight member of FIG. 1, and showing a state in which a heat insulating material, a beam, a joist, and a floor joist have been attached. FIG. [Figure 10] 1. FIG. 4 is a cross-sectional view showing a procedure for installing the airtight member of FIG. 1, and a cross-sectional view showing a state in which a floor surface material is attached. DETAILED DESCRIPTION OF THE INVENTION

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes embodiments of the present invention with reference to the accompanying drawings. Note that the following embodiments are examples that embody the present invention and are not intended to limit the technical scope of the present invention.

[0026] Fig. 1 is a perspective, partially cross-sectional view showing a cutout portion of the airtight structure for a building according to the present invention with the face material disassembled, and Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1.

[0027] Referring to Figures 1 and 2, the airtight structure 1 of a building comprises a foundation 2, an exterior wall portion 3 provided on a rising portion 2b of the foundation 2, a floor underlayment material 4 provided on a base portion 2a of the foundation 2, a floor surface material 5 provided on the floor underlayment material 4, a foundation insulation material 6 provided on the foundation 2, and an airtight member 7 provided from the foundation 2 to the exterior wall portion 3.

[0028] The foundation 2 supports the exterior wall portion 3, on which it is placed. Specifically, the foundation 2 includes a base portion 2a extending horizontally and a rising portion 2b rising vertically from the base portion 2a. The foundation insulation 6 includes a base insulation 6a provided along the upper surface of the base portion 2a, an inner insulation 6b provided on the base insulation 6a along the inner surface of the rising portion 2b, an outer insulation 6c provided along the outer surface of the rising portion 2b, and a soft insulation 6d provided between the inner insulation 6b and the underfloor material 4 and having greater flexibility than the inner insulation 6b.

[0029] The exterior wall portion 3 stands along and on the rising portion 2b of the foundation 2, and has an opening A1. Specifically, the exterior wall portion 3 has a structural wall portion 3a standing on the rising portion 2b of the foundation 2, an exterior wall base 3b standing on the rising portion 2b outside the structural wall portion 3a, and a French window (an example of a fixture) 3c attached to the structural wall portion 3a.

[0030] The structural wall portion 3a comprises a plurality of pillars 3a1 (only one is shown in Figures 1 and 2) erected on the rising portion 2b, a lower crosspiece 3a2 provided between the lower ends of a pair of pillars 3a1 facing each other across the opening A1, an upper crosspiece (not shown) provided between the upper ends of a pair of pillars 3a1 facing each other across the opening A1, a height adjustment member 3a3 provided on the lower crosspiece 3a2, an inner insulating material 3a4 provided between two adjacent pillars 3a1 on a position opposite the opening A1, and a plate material 3a5 fixed to the pillar 3a1 so as to cover the inner insulating material 3a4 from the outside. In this embodiment, a pair of pillars 3a1, a lower crosspiece 3a2, a height adjustment member 3a3, and an upper crosspiece (not shown) facing each other across the opening A1 correspond to opening forming members for forming the opening A1 surrounded by a pair of horizontal surfaces facing each other in the vertical direction and a pair of vertical surfaces facing each other in the horizontal direction (vertical surfaces 3a1a of the pillars 3a1).

[0031] The exterior wall base 3b is provided at a position horizontally offset from the opening A1. Specifically, the exterior wall base 3b includes vertical beams 3b1 that extend vertically and are attached to the pillars 3a1 via plates 3a5, and outer heat insulating materials 3b2 that are provided to the sides of the vertical beams 3b1 in an area offset from the opening A1.

[0032] The French window 3c is attached to a pair of pillars 3a1 and a lower rail 3a2 from the outside of the room so as to fit into the opening A1. Specifically, the French window 3c has a window frame 3c1 attached to the pillars 3a1 and the lower rail 3a2 of the structural wall 3a, a lower protrusion (an example of a covering portion) 3c2 protruding toward the room from the bottom of the window frame 3c1, side protrusions 3c3 (only one is shown in Figures 1 and 2) protruding toward the room from both horizontal ends of the window frame 3c1, and a pair of sliding doors 3c4 attached within the window frame 3c1 so as to be slidable relative to the window frame 3c1. The lower protrusions 3c2 extend horizontally along the outside edge of the floor surface material 5 (an upper surface material 5b, described later) to cover the edge from above. The side protrusions 3c3 form a storage space S1 between themselves and the vertical surface 3a1a of the pillar 3a1 facing the opening A1 to store the outside edge of the frame (not shown). Specifically, the side protrusions 3c3 face the surface of the pillar 3a1 facing the opening A1 and extend vertically. In this embodiment, the lower protrusions 3c2 are provided across a pair of adjacent side protrusions 3c3 (only one is shown in FIGS. 1 and 2).

[0033] The floor underlayment material 4 comprises a plurality of beams 4a (only one is shown in Figure 2) arranged on the base portion 2a of the foundation 2, joists 4b (only one is shown in Figure 2) arranged on each of the beams 4a, a plurality of joists 4c (only one is shown in Figure 2) arranged on the joists 4b, a floor support member 4d attached to the height adjustment member 3a3 of the exterior wall portion 3 and supporting the floor material 5 together with the joists 4c, and a floor insulation material 4e arranged on the indoor side of the floor support member 4d.

[0034] The multiple joists 4b extend in one horizontal direction (a direction perpendicular to the plane of FIG. 2) and are spaced apart in the other horizontal direction (the left-right direction in FIG. 2). Each joist 4b is supported by multiple beams 4a spaced apart in the longitudinal direction of the joist 4b. The multiple floor joists 4c extend in the horizontal direction perpendicular to the longitudinal direction of the joists 4b (the left-right direction in FIG. 2) and are spaced apart in the longitudinal direction of the joists 4b. Each floor joist 4c is supported by multiple floor joists 4b spaced apart in the longitudinal direction of the joists 4c.

[0035] The floor support member 4d has a support surface 4d1 for supporting the floor surface material 5, and is attached to the height adjustment member 3a3 so that the support surface 4d1 is located below the upper surface 3a3a of the height adjustment member 3a3. Specifically, the floor support member 4d has an opening edge portion 4d2 extending horizontally along the lower edge of the opening A1, and an outer opening portion 4d3 extending horizontally from the opening edge portion 4d2 toward an area outside the opening A1, and the support surface 4d1 is provided across the opening edge portion 4d2 and the outer opening portion 4d3. In this embodiment, the upper surface 3a3a of the height adjustment member 3a3 corresponds to the lower horizontal surface of a pair of horizontal surfaces (the lower surface of the upper rail and the upper surface 3a3a of the height adjustment member 3a3) that face each other in the vertical direction in the opening-forming member (the pair of pillars 3a1, the lower rail 3a2, the height adjustment member 3a3, and the upper rail (not shown)). The support surface 4d1 of the floor support member 4d is located at the same height as the upper surface of the floor joist 4c, and the floor support member 4d, together with the floor joist 4c, supports the floor surface material 5. The upper surface 3a3a of the height adjustment member 3a3 supports an upper surface material 5b (described later) of the floor surface material 5, but the upper surface material 5b is supported by the lower surface material 5a, so in this embodiment, it is the floor support member 4d and the floor joist 4c that support the lower surface material 5a that essentially support the floor surface material 5.

[0036] The floor insulation material 4e is provided between adjacent joists 4c on the indoor side of the floor support member 4d, between the soft insulation material 6d and the floor surface material 5. The floor insulation material 4e, soft insulation material 6d, inner insulation material 6b, and base insulation material 6a provide a continuous insulation covering the base portion 2a of the foundation 2 to the rising portion 2b.

[0037] The floor surface material 5 has a lower surface material 5a supported by floor joists 4c and floor support members 4d, and an upper surface material 5b laminated on the lower surface material 5a.

[0038] The lower surface material 5a is placed on the upper surface of the floor joist 4c and the support surface 4d1 of the floor support member 4d. Specifically, the lower surface material 5a has a portion provided on the opening edge portion 4d2 of the floor support member 4d and a portion provided on the opening outer portion 4d3. The vertical height dimension of the lower inner surface 3a3b, which extends downward from the indoor-side edge of the height adjustment member 3a3 and faces the room, is set to a dimension equivalent to the thickness dimension of the lower surface material 5a. Therefore, by placing the lower surface material 5a on the support surface 4d1 of the floor support member 4d, the upper surface of the lower surface material 5a and the upper surface 3a3a of the height adjustment member 3a3 are arranged on the same plane. The lower inner surface 3a3b of the height-adjusting member 3a3 is disposed on the same plane as the lateral inner surface 3a1b (the surface of the column 3a1 facing the room) that extends horizontally from the lower inner surface 3a3b beyond one of the vertical surfaces 3a1a in the outer wall portion 3 and faces the room, and the surface of the inner heat insulating material 3a4 that faces the room. In this embodiment, the lower surface material 5a has a substantially rectangular shape in a plan view, with side portions that extend across the lower inner surface 3a3b and the lateral inner surface 3a1b.

[0039] The upper surface material 5b is provided on the lower surface material 5a so as to cover the lower surface material 5a and the upper surface 3a3a (lower horizontal surface) of the height adjustment member 3a3. Specifically, the upper surface material 5b has an overlapping portion 5b1 arranged to overlap the common joist 4c and the floor support member 4d (lower surface material 5a), and a protruding portion 5b2 extending from the overlapping portion 5b1 into the opening A1 and covering the upper surface 3a3a of the height adjustment member 3a3. The overlapping portion 5b1 has a portion overlapping the opening edge portion 4d2 of the floor support member 4d and a portion overlapping the opening outer portion 4d3. As shown in FIG. 3, a vertical gap corresponding to the thickness of the protruding portion 5b2 of the upper surface material 5b is formed between the lower protruding portion 3c2 of the window frame 3c1 and the upper surface 3a3a of the height adjustment member 3a3. Therefore, by inserting the outdoor-side edge of the protruding portion 5b2 of the upper surface material 5b under the lower protruding portion 3c2 of the window frame 3c1, the outdoor-side edge of the protruding portion 5b2 of the upper surface material 5b can be covered by the lower protruding portion 3c2. In other words, in order to cover the outdoor-side edge of the upper surface material 5b from above, the French window 3c has a lower protruding portion 3c2 (an example of a covering portion) attached to the lower rail 3a2 with a vertical gap equivalent to the thickness of the upper surface material 5b formed between it and the upper surface 3a3a of the height-adjusting member 3a3.

[0040] Referring to FIG. 1, the airtight member 7 forms an airtight line that runs continuously from the exterior wall 3 through the floor support member 4d to the foundation 2. Specifically, the airtight member 7 includes a first airtight member 7a extending from a portion of the exterior wall 3 outside the opening A1 to the foundation 2, a second airtight member 7b extending from a portion of the exterior wall 3 outside the opening A1 to a portion within the opening A1 to the foundation 2, and a third airtight member 7c extending from a portion of the exterior wall 3 within the opening A1 to the foundation 2. The first airtight member 7a, the second airtight member 7b, and the third airtight member 7c are arranged side by side in the horizontal direction, and adjacent airtight members are connected to each other by airtight tape (not shown). The airtight members 7a to 7c are made of an airtight material (e.g., a polypropylene (PP) sheet, a polyethylene (PE) sheet, a polyester sheet, or an ethylene vinyl acetate (EVA) sheet).

[0041] As shown in FIG. 1, the first airtight member 7a includes a first support surface mounting portion 7a1, a first wall inner surface mounting portion 7a2, a first component inner surface mounting portion 7a3, a first component underside mounting portion 7a4, and a first foundation mounting portion 7a5. The first support surface mounting portion 7a1 is disposed on the support surface 4d1 of the floor support member 4d along the support surface 4d1. The first wall inner surface mounting portion 7a2 extends upward from the outdoor-side edge of the first support surface mounting portion 7a1 and is disposed along the horizontal inner surface 3a1b of the column 3a1 and the indoor-facing surface of the internal insulation member 3a4. The first component inner surface mounting portion 7a3 extends downward from the indoor-side edge of the first support surface mounting portion 7a1 and is disposed along the indoor-facing surface of the floor support member 4d. The first component underside mounting portion 7a4 extends outdoor from the lower edge of the first component inner surface mounting portion 7a3 and is disposed along the underside of the floor support member 4d. The first base placement portion 7a5 extends downward from the edge of the first member underside placement portion 7a4 on the outdoor side, and is placed along the inner surface of the base 2 (rising portion 2b).

[0042] Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1, showing the airtight structure 1 cut along a plane between the side protrusion 3c3 of the window frame 3c1 and the pillar 3a1. Fig. 4 is an exploded perspective view of the airtight member in the airtight structure of Fig. 1. Fig. 5 is an enlarged perspective view of the second airtight member 7b.

[0043] 2, 4, and 5, the second airtight member 7b includes a second horizontally disposed portion 7ba, a second lower inner surface disposed portion 7bb, a second support surface disposed portion 7bc, a second member inner surface disposed portion 7bd, a second member lower surface disposed portion 7be, a second foundation disposed portion 7bf, and a second fitting disposed portion 7bg. The second horizontally disposed portion 7ba is disposed along the upper surface 3a3a of the height-adjustable member 3a3. The second lower inner surface disposed portion 7bb extends downward from the room-side edge of the second horizontally disposed portion 7ba and is disposed along the lower inner surface 3a3b of the height-adjustable member 3a3. The second support surface disposed portion 7bc extends toward the room from the lower edge of the second lower inner surface disposed portion 7bb and is disposed along the support surface 4d1 of the floor support member 4d. The second member inner surface disposed portion 7bd extends downward from the room-side edge of the second support surface disposed portion 7bc and is disposed along the surface of the floor support member 4d facing the room. The second-component-underside-arrangement portion 7be extends from the lower edge of the second-component-internal-arrangement portion 7bd toward the exterior and is disposed along the underside of the floor support member 4d. The second-foundation-arrangement portion 7bf extends downward from the exterior-side edge of the second-component-underside-arrangement portion 7be and is disposed along the interior surface of the foundation 2 (rising portion 2b). The second-fitting-part-arrangement portion 7bg extends upward from the exterior-side edge of the second horizontal-arrangement portion 7ba and is disposed along the interior-facing surface of the window frame 3c1 of the French window 3c (the surface facing the interior in the area opposite the opening A1 of the side protrusion 3c3). The second-component-internal-arrangement portion 7bd, the second-component-underside-arrangement portion 7be, and the second-foundation-arrangement portion 7bf correspond to foundation-connecting portions that extend downward from the interior-side edge of the second support-surface-arrangement portion 7bc and are connected to the interior-facing surface of the foundation 2.

[0044] Furthermore, the second airtight member 7b has a second vertically disposed portion 7bh and a second horizontally disposed portion 7bi. The second vertically disposed portion 7bh extends upward from the edge of the second horizontally disposed portion 7ba that is closest to the vertical surface 3a1a of the column 3a1 and is disposed along the vertical surface 3a1a, and is connected to the second fitting disposed portion 7bg. The second horizontally disposed portion 7bi extends horizontally from the edge of the second vertically disposed portion 7bh on the indoor side and is disposed along the horizontally disposed surface 3a1b of the column 3a1 and the surface of the inner heat insulating material 3a4 that faces the room.

[0045] The second lower inner surface arrangement portion 7bb has a lower inner surface main body portion 7bb1 connected to the second horizontal arrangement portion 7ba, and a lower inner surface extension portion 7bb2 extending horizontally from the lower inner surface main body portion 7bb1 and connected to the second horizontal inner surface arrangement portion 7bi.

[0046] The second support surface arrangement portion 7bc has a support surface main body portion 7bc1 connected to the lower inner surface main body portion 7bb1, and a support surface extension portion 7bc2 extending horizontally from the support surface main body portion 7bc1 and connected to the lower inner surface extension portion 7bb2.

[0047] The second member inner surface arrangement portion 7bd has a member inner surface main body portion 7bd1 connected to the support surface main body portion 7bc1, and a member inner surface extension portion 7bd2 extending horizontally from the member inner surface main body portion 7bd1 and connected to the support surface extension portion 7bc2.

[0048] The second component lower surface arrangement portion 7be has a component lower surface main body 7be1 connected to the component inner surface main body portion 7bd1, and a component lower surface extension portion 7be2 extending horizontally from the component lower surface main body 7be1 and connected to the component inner surface extension portion 7bd2.

[0049] The second foundation arrangement portion 7bf has a foundation main body 7bf1 connected to the component lower surface main body 7be1, and a foundation extension portion 7bf2 extending horizontally from the foundation main body 7bf1 and connected to the component lower surface extension portion 7be2.

[0050] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1, showing the airtight structure 1 cut along a plane passing through the lower protruding portion 3c2 of the window frame 3c1.

[0051] 3 and 4, the third airtight member 7c includes a third horizontally disposed portion 7ca, a third lower inner surface disposed portion 7cb, a third support surface disposed portion 7cc, a third member inner surface disposed portion 7cd, a third member lower surface disposed portion 7ce, a third foundation disposed portion 7cf, and a third fitting disposed portion 7cg. The third horizontally disposed portion 7ca is disposed along the upper surface 3a3a of the height adjustment member 3a3. The third lower inner surface disposed portion 7cb extends downward from the room-side edge of the third horizontally disposed portion 7ca and is disposed along the lower inner surface 3a3b of the height adjustment member 3a3. The third support surface disposed portion 7cc extends toward the room from the lower edge of the third lower inner surface disposed portion 7cb and is disposed along the support surface 4d1 of the floor support member 4d. The third member inner surface disposed portion 7cd extends downward from the room-side edge of the third support surface disposed portion 7cc and is disposed along the surface of the floor support member 4d facing the room. The third-component-underside-arrangement portion 7ce extends from the lower edge of the third-component-internal-arrangement portion 7cd toward the exterior and is disposed along the underside of the floor support member 4d. The third-foundation-arrangement portion 7cf extends downward from the exterior-side edge of the third-component-underside-arrangement portion 7ce and is disposed along the interior surface of the foundation 2 (rising portion 2b). The third-fitting-part-arrangement portion 7cg extends upward from the exterior-side edge of the third horizontal-arrangement portion 7ca and is disposed along the interior-facing surface of the window frame 3c1 of the French window 3c (the surface facing the interior below the lower protrusion 3c2). The third-component-internal-arrangement portion 7cd, the third-component-underside-arrangement portion 7ce, and the third-foundation-arrangement portion 7cf correspond to foundation-connecting portions that extend downward from the interior-side edge of the third support-surface-arrangement portion 7cc and are connected to the interior-facing surface of the foundation 2.

[0052] FIG. 6 is an exploded perspective view of the third airtight member 7c. As shown in FIGS. 4 and 6, the third airtight member 7c in this embodiment is integrally formed by combining three members. Specifically, the third airtight member 7c has a first piece 7cA, a second piece 7cB, and a third piece 7cC. The first piece 7cA has a portion corresponding to a part of the third horizontally-mounted portion 7ca and a third fitting-mounted portion 7cg. The second piece 7cB has a portion corresponding to a part of the third horizontally-mounted portion 7ca and a third lower inner surface-mounted portion 7cb. The third piece 7cC has a third lower inner surface-mounted portion 7cb, a third support surface-mounted portion 7cc, a third member-inner surface-mounted portion 7cd, a third member-underside surface-mounted portion 7ce, and a third base-mounted portion 7cf. The first piece 7cA and the second piece 7cB are joined together with portions 7cA1 and 7cB1 corresponding to parts of the third horizontally disposed portion 7ca overlapping each other, and the second piece 7cB and the third piece 7cC are joined together with portions 7cb corresponding to parts of the third lower inner surface disposed portion 7cb overlapping each other.

[0053] In this embodiment, the third airtight member 7c is formed by joining the first piece 7cA, the second piece 7cB, and the third piece 7cC together, but it may be formed from a single member. Meanwhile, in this embodiment, the first airtight member 7a and the second airtight member 7b are formed from a single member, but they may be formed by joining multiple pieces. By preparing the second airtight member 7b and the third airtight member 7c having the above-mentioned configuration as a single member in advance, the construction work of the airtight structure 1 can be simplified using the second airtight member 7b and the third airtight member 7c.

[0054] The procedure for constructing the airtight structure 1 using the airtight members 7a to 7c will be described below.

[0055] First, prepare the structure shown in Figures 4 and 7. Specifically, in this structure, only the outer insulating material 6c of the foundation insulating material 6 is provided on the foundation 2, and the outer wall portion 3 is provided on the foundation 2. Furthermore, in the above configuration, only the floor support member 4d of the floor underlayment material 4 is attached to the lower rail 3a2.

[0056] Next, the first airtight member 7a is attached to the area outside the opening in the configuration shown in FIG. 4, as shown in FIG. 1. Specifically, the first support surface arrangement portion 7a1 is arranged along the support surface 4d1, the first wall inner surface arrangement portion 7a2 is arranged along the horizontal inner surface 3a1b of the column 3a1 and the surface of the inner heat insulating material 3a4 facing the room, and the first member inner surface arrangement portion 7a3 is arranged along the surface of the floor support member 4d facing the room. Furthermore, the first member undersurface arrangement portion 7a4 is arranged along the undersurface of the floor support member 4d, and the first foundation arrangement portion 7a5 is arranged along the surface of the foundation 2 (rising portion 2b) facing the room. Note that adhesive layers are provided on all or part of the surfaces of the first airtight member 7a facing the foundation 2, the outer wall portion 3, and the floor support member 4d, and the first airtight member 7a is bonded to the foundation 2, the outer wall portion 3, and the floor support member 4d via the adhesive layers. The adhesive layer may be provided by a double-sided tape or may be formed by an adhesive.

[0057] Next, the second airtight member 7b is attached over the area outside the opening and the area inside the opening in the configuration shown in Fig. 4. Specifically, as shown in Figs. 2 and 4, the second horizontally disposed portion 7ba is disposed along the upper surface 3a3a of the height adjustment member 3a3, the second lower inner surface disposed portion 7bb is disposed along the lower inner surface 3a3b of the height adjustment member 3a3, and the second support surface disposed portion 7bc is disposed along the support surface 4d1. Furthermore, the second member inner surface disposed portion 7bd is disposed along the surface of the floor support member 4d facing the room, the second member lower surface disposed portion 7be is disposed along the lower surface of the floor support member 4d, and the second base disposed portion 7bf is disposed along the surface of the base 2 (rising portion 2b) facing the room. The second fitting arrangement portion 7bg is arranged along the surface of the window frame 3c1 facing the interior of the room, the second vertical arrangement portion 7bh is arranged along the vertical surface 3a1a of the pillar 3a1, and the second horizontal inner surface arrangement portion 7bi is arranged along the horizontal inner surface 3a1b of the pillar 3a1. An adhesive layer is provided on all or part of the surface of the second airtight member 7b facing the foundation 2, outer wall portion 3, floor support member 4d, and window frame 3c1, and the second airtight member 7b is joined to the foundation 2, outer wall portion 3, floor support member 4d, and window frame 3c1 via the adhesive layer. The adhesive layer may be provided by double-sided tape or may be formed by adhesive.

[0058] Next, the third airtight member 7c is attached to the area within the opening in the configuration shown in FIG. 4. Specifically, as shown in FIGS. 4 and 8, the third horizontally disposed portion 7ca is disposed along the upper surface 3a3a of the height-adjusting member 3a3, the third member-inner-surface disposed portion 7cd is disposed along the lower inner surface 3a3b of the height-adjusting member 3a3, and the third support-surface disposed portion 7cc is disposed along the support surface 4d1. Furthermore, the third member-inner-surface disposed portion 7cd is disposed along the surface of the floor support member 4d facing the room, the third member-undersurface disposed portion 7ce is disposed along the lower surface of the floor support member 4d, and the third foundation disposed portion 7cf is disposed along the surface of the foundation 2 (rising portion 2b) facing the room. Furthermore, the third fitting disposed portion 7cg is disposed along the surface of the window frame 3c1 facing the room. An adhesive layer is provided on the entire or part of the surface of the third airtight member 7c facing the foundation 2, the outer wall 3, the floor support member 4d, and the window frame 3c1, and the third airtight member 7c is joined to the foundation 2, the outer wall 3, the floor support member 4d, and the window frame 3c1 via the adhesive layer. The adhesive layer may be provided by double-sided tape or may be formed by an adhesive.

[0059] Next, as shown in Fig. 9, inner insulation material 6b and soft insulation material 6d are installed on the foundation 2, and beams 4a are erected on the base portion 2a of the foundation 2, with joists 4b installed on the beams 4a. Furthermore, joists are installed on the joists 4b, and floor insulation material 4e is installed on the soft insulation material 6d.

[0060] Furthermore, as shown in FIG. 10, the lower surface material 5a is placed on the support surface 4d1 (first support surface arrangement portion 7a1, second support surface arrangement portion 7bc, and third support surface arrangement portion 7cc) of the floor support member 4d. Specifically, the lower surface material 5a is placed so as to fit into the step portion formed by the height adjustment member 3a3 and the floor support member 4d. Furthermore, the upper surface material 5b is placed on the lower surface material 5a so as to cover the lower surface material 5a and the upper surface 3a3a of the height adjustment member 3a3 (second horizontal arrangement portion 7ba and third horizontal arrangement portion 7ca). At this time, the upper surface material 5b is placed so that the outdoor edge of the upper surface material 5b is inserted between the lower protrusion 3c2 of the window frame 3c1 and the upper surface 3a3a of the height adjustment member 3a3. This allows the airtight structure 1 shown in FIGS. 2 and 3 to be constructed.

[0061] As described above, in the airtight structure 1, at the interface between the floor support member 4d and the floor surface material 5, the support surface 4d1 is positioned below the upper surface 3a3a (lower horizontal surface) of the height adjustment member 3a3, thereby forming a step between the opening-forming member (the pair of pillars 3a1, the lower crosspiece 3a2, the height adjustment member 3a3, and the upper crosspiece (not shown)) and the floor support member 4d. In this configuration, to create an airtight state from the opening-forming member to the floor support member 4d, it is necessary to form an airtight line along a path from the upper surface 3a3a, the surface of the opening-forming member facing the room (the lower inner surface 3a3b of the height adjustment member 3a3), and the support surface 4d1. In the present invention, the second airtight member 7b and the third airtight member 7c have a shape that allows them to be arranged along the path of the airtight line, thereby simplifying the installation work of the airtight members 7b and 7c to form an airtight line at the interface between the floor support member 4d and the floor surface material 5.

[0062] According to the above configuration, the second airtight member 7b and the third airtight member 7c have the second fixture placement section 7bg and the third fixture placement section 7cg, so that a continuous airtight line can be easily formed from the French window 3c to the floor support member 4d.

[0063] According to the above configuration, the vertical dimension of the lower inner surface 3a3b is set to a dimension equivalent to the thickness dimension of the lower surface material 5a, so that by placing the lower surface material 5a on the support surface 4d1, the upper surface of the lower surface material 5a and the upper surface 3a3a (horizontally disposed portions 7ba, 7ca) can be arranged on the same plane. By stacking the upper surface material 5b on the lower surface material 5a and the upper surface 3a3a, the airtight members 7b, 7c can be covered to finish the floor surface.

[0064] According to the above configuration, the airtight members 7b and 7c can be covered by placing the upper surface material 5b, and further, by covering the outdoor edge of this upper surface material 5b with the lower protrusion (an example of a covering portion) 3c2, the edge of the upper surface material 5b can be contained within the French window 3c.

[0065] According to the above-mentioned configuration, the lower inner surface 3a3b of the opening-forming member is arranged on the same plane as the surface of the column 3a1 facing the room and the surface of the inner heat insulating material 3a4 facing the inside, so that the edge of the lower surface material 5a on the outside of the room can be made straight, simplifying the shape of the lower surface material 5a. This makes it possible to share the lower surface material 5a with floor surface materials installed in positions other than the French window 3c in the building.

[0066] According to the above configuration, the airtight members 7b, 7c have foundation connection portions (second member inner surface mounting portion 7bd, second member underside mounting portion 7be, second foundation mounting portion 7bf, third member inner surface mounting portion 7cd, third member underside mounting portion 7ce, and third foundation mounting portion 7cf), so that a continuous airtight line can be easily formed from the French window 3c to the foundation 2.

[0067] According to the above configuration, the second airtight member 7b has a second vertically positioned portion 7bh, a second horizontal inner surface positioned portion 7bi, a lower inner surface extension portion 7bb2, and a support surface extension portion 7bc2, so that the second airtight member 7b can be easily positioned over the opening A1 and an area horizontally offset from the opening A1. [Explanation of symbols]

[0068] 1. Airtight structure 2 Basics 3a1 Pillar (an example of an opening forming member) 3a1b Lateral inner surface 3a2 Lower rail (an example of an opening forming member) 3a3 Height adjusting member (an example of an opening forming member) 3a3a Top surface (an example of the lower horizontal surface) 3a3b Lower inner surface 3c. French window (an example of a fixture) 3c2 Lower protrusion (example of covering part) 4d Floor support member 4d1 Support surface 5 Floor material 5a Lower layer material 5b Top layer material 7 Airtight materials 7b Second airtight member 7ba 2nd horizontal placement section 7bb 2nd lower inner surface placement part 7bb1 Lower inner main body part 7bb2 Lower inner surface extension 7bc 2nd support surface arrangement part 7bc1 Support surface body part 7bc2 Support surface extension 7bd Second member inner surface arrangement part (example of foundation connection part) 7be Second member underside placement part (example of foundation connection part) 7bf Second foundation arrangement section (example of foundation connection section) 7bg Second fitting arrangement section 7bh 2nd vertical placement part 7bi Second horizontal inner surface arrangement part 7c Third airtight member 7ca 3rd horizontal placement part 7cb 3rd lower inner surface placement part 7cc 3rd support surface arrangement part 7cd Third member inner surface placement part (example of foundation connection part) 7ce Third member underside placement part (example of foundation connection part) 7cf Third foundation arrangement section (example of foundation connection section) 7cg Third fitting arrangement section A1 opening

Claims

1. An airtight structure of a building, an opening forming member that forms an opening surrounded by a pair of horizontal surfaces that face each other in the vertical direction and a pair of vertical surfaces that face each other in the horizontal direction; a floor support member having a support surface for supporting a floor surface material, the support surface being attached to the opening forming member so as to be positioned below a lower horizontal plane that is located lower than the pair of horizontal planes; An airtight structure for a building comprising an airtight member having: a horizontally positioned portion arranged along the lower horizontal plane; a lower inner surface positioned portion extending downward from the indoor-side edge of the horizontally positioned portion and extending downward from the indoor-side edge of the lower horizontal plane of the opening-forming member and arranged along the lower inner surface facing the room; and a support surface positioned portion extending from the lower edge of the lower inner surface positioned portion toward the room and arranged along the support surface.

2. The airtight structure for a building according to claim 1 further comprises a fixture attached to the opening-forming member from the outside of the room so as to be fitted into the opening, An airtight structure for a building, wherein the airtight member has a fitting placement section that extends upward from the outdoor edge of the horizontal placement section and is positioned along the surface of the fitting facing the interior of the room.

3. The airtight structure of a building according to claim 2, The floor surface material has a lower surface material placed on the support surface and an upper surface material provided on the lower surface material so as to cover the lower surface material and the lower horizontal surface, An airtight structure for a building, wherein the vertical height dimension of the lower inner surface of the opening-forming member is set to a dimension equivalent to the thickness dimension of the lower surface material.

4. The airtight structure of a building according to claim 3, The building's airtight structure has a covering portion attached to the opening-forming member with a vertical gap corresponding to the thickness dimension of the upper surface material formed between the upper surface material and the lower horizontal plane, in order to cover the outdoor edge of the upper surface material from above.

5. The airtight structure of a building according to claim 3 or 4, An airtight structure for a building, wherein the lower inner surface of the opening-forming member is positioned on the same plane as a lateral inner surface of the opening-forming member that extends horizontally from the lower inner surface beyond one vertical surface and faces the interior of the room.

6. The airtight structure for a building according to any one of claims 1 to 4 further comprises a foundation on which the opening-forming member is placed and which supports the opening-forming member, The airtight structure of a building, wherein the airtight member has a foundation connection portion that extends downward from the indoor-side edge of the support surface arrangement portion and is connected to the indoor-facing surface of the foundation.

7. The airtight structure of a building according to any one of claims 1 to 4, The airtight member has a vertically disposed portion that extends upward from an edge of the horizontally disposed portion that is close to one of the pair of vertical surfaces and is disposed along the one vertical surface, and a horizontally inner surface disposed portion that extends horizontally from an edge of the vertically disposed portion that is on the room side and that extends horizontally from the lower inner surface of the opening forming member beyond the one vertical surface and is disposed along a horizontal inner surface that faces the room, the lower inner surface disposing portion has a lower inner surface main body portion connected to the horizontal disposing portion, and a lower inner surface extension portion extending horizontally from the lower inner surface main body portion and connected to the horizontal inner surface disposing portion, An airtight structure for a building, wherein the support surface arrangement portion has a support surface main body portion connected to the lower inner surface arrangement portion, and a support surface extension portion extending horizontally from the support surface main body portion and connected to the lower inner surface extension portion.

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