Airtight structure for building

Abstract

The present invention simplifies work for installing an airtight member at a portion where an opening and a floor surface material meet.　An airtight structure (1) for 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 each other in a horizontal direction; a floor support member (4d) that has a support surface (4d1) for supporting a floor surface material (5) and is attached such that the support surface (4d1) is positioned below an upper surface (3a3a) of a height adjustment member (3a3); and a second airtight member (7b) that has a second horizontal disposed part (7ba) disposed along the upper surface (3a3a), a second lower-inner-surface disposed part (7bb) extending downward from an indoor-side edge of the second horizontal disposed part (7ba) and disposed along a lower inner surface (3a3b), and a second support-surface disposed part (7bc) extending toward the room interior from a lower edge of the second lower-inner-surface disposed part (7bb) and disposed along the support surface (4d1).

Description

Airtight structure of a building

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

[0002] Conventionally, for example, an airtight structure described in Patent Document 1 has been known.

[0003] The airtight structure described in Patent Document 1 includes a wall and an airtight sheet provided on the wall. The wall has an opening that opens in a predetermined direction and has a corner at a viewing point along the predetermined direction, a surrounding surface that surrounds the opening, and an outer surface that extends in a direction away from the opening from one end of the surrounding surface in the predetermined direction. The airtight sheet has a predetermined folding line for forming a portion along one surface of the corner portion on the surrounding surface, a portion along the other surface of the corner portion, and a portion along the outer surface.

[0004] According to the airtight structure described in Patent Document 1, by folding the airtight sheet along the folding line, an airtight sheet can be continuously provided from one surface and the other surface at the corner portion to the outer surface.

[0005] A fitting may be provided in the opening provided in the wall. For example, when a sweep-out window is provided, the structure at the joint portion between the lower part of the sweep-out window and the floor covering becomes complicated.

[0006] Therefore, when adopting a configuration in which the airtight sheet is folded at a predetermined folding line as described in Patent Document 1, there is a problem that the number of folding portions and the folding directions increase, and the construction work of the airtight sheet becomes complicated. <00>

[0007] Japanese Unexamined Patent Application Publication No. 2024 - 108310

[0008] An object of the present invention is to provide an airtight structure of a building that can simplify the installation work of an airtight member at the joint portion between an opening and a floor covering.

[0009] To solve the above problems, an airtight structure for a building according to one aspect of the present invention comprises: an opening forming member that forms an opening surrounded by a pair of horizontal planes facing each other in the vertical direction and a pair of vertical planes facing each other in the horizontal direction; a floor support member that has a support surface for supporting a floor surface material and is attached to the opening forming member such that the support surface is positioned below the lower horizontal plane which is located below the pair of horizontal planes; an airtight member having a horizontal arrangement portion positioned along the lower horizontal plane; a lower inner surface arrangement portion that extends downward from the interior-side edge of the horizontal arrangement portion and is positioned along the lower inner surface of the opening forming member that extends downward from the interior-side edge of the lower horizontal plane and faces the interior; and a support surface arrangement portion that extends inward from the lower edge of the lower inner surface arrangement portion and is positioned along the support surface.

[0010] According to the present invention, the installation work of airtight members at the interface between the opening and the floor surface material can be simplified.

[0011] This is a perspective view of a part of the airtight structure of a building according to the present invention, with the facing material disassembled. This is a cross-sectional view taken along line II-II in Figure 1. This is a cross-sectional view taken along line III-III in Figure 1. This is a perspective view of the airtight member in the airtight structure of Figure 1, with the airtight member disassembled. This is a perspective view showing an enlarged view of the corner airtight member in Figure 4. This is a perspective view showing an enlarged view of the opening airtight member in Figure 4, with the airtight member disassembled. This is a cross-sectional view showing the procedure for constructing the airtight structure of Figure 1, showing the state before the airtight member is installed. This is a cross-sectional view showing the procedure for constructing the airtight structure of Figure 1, showing the state after the opening airtight member has been installed. This is a cross-sectional view showing the procedure for constructing the airtight member of Figure 1, showing the state after the insulation material, posts, girders, and joists have been installed. This is a cross-sectional view showing the procedure for constructing the airtight member of Figure 1, showing the state after the floor facing material has been installed.

[0012] Embodiments of the present invention will be described below with reference to the attached 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.

[0013] Figure 1 is a perspective cross-sectional view showing a portion of the airtight structure of a building according to the present invention, with the facing material disassembled. Figure 2 is a cross-sectional view taken along line II-II in Figure 1.

[0014] Referring to Figures 1 and 2, the airtight structure 1 of the building comprises a foundation 2, an exterior wall section 3 provided on the rising portion 2b of the foundation 2, a floor underlayment 4 provided on the base portion 2a of the foundation 2, a floor surface material 5 provided on the floor underlayment 4, a foundation insulation material 6 provided on the foundation 2, and an airtight member 7 provided extending from the foundation 2 to the exterior wall section 3.

[0015] The foundation 2 supports the exterior wall section 3. Specifically, the foundation 2 comprises a base section 2a extending horizontally and a rising section 2b rising vertically from the base section 2a. The foundation insulation material 6 comprises a base insulation material 6a provided along the upper surface of the base section 2a, an inner insulation material 6b provided along the inner surface of the rising section 2b on the base insulation material 6a, an outer insulation material 6c provided along the outer surface of the rising section 2b, and a soft insulation material 6d provided between the inner insulation material 6b and the floor underlayment 4, which has higher flexibility than the inner insulation material 6b.

[0016] The exterior wall section 3 is erected on the rising section 2b of the foundation 2 and has an opening A1. Specifically, the exterior wall section 3 includes a structural wall section 3a erected on the rising section 2b of the foundation 2, an exterior wall base 3b erected on the rising section 2b outside the structural wall section 3a, and a sliding window (an example of a joinery) 3c attached to the structural wall section 3a.

[0017] The structural wall section 3a comprises a plurality of columns 3a1 (only one is shown in Figures 1 and 2) erected on the rising section 2b, a lower rail 3a2 provided between the lower ends of a pair of columns 3a1 facing each other across the opening A1, an upper rail (not shown) provided between the upper ends of a pair of columns 3a1 facing each other across the opening A1, a height adjustment member 3a3 provided on the lower rail 3a2, an inner insulation material 3a4 provided between two adjacent columns 3a1 on the opposite side of the opening A1, and a plate material 3a5 fixed to the column 3a1 so as to cover the inner insulation material 3a4 from the outside. In this embodiment, a pair of columns 3a1, a lower rail 3a2, a height adjustment member 3a3, and an upper rail (not shown) facing each other across the opening A1 correspond to opening-forming members for forming the opening A1, which is surrounded by a pair of horizontal planes facing each other in the vertical direction and a pair of vertical planes facing each other in the horizontal direction (the vertical planes 3a1a of the columns 3a1).

[0018] The exterior wall substrate 3b is provided in a position away from the opening A1 in the horizontal direction. Specifically, the exterior wall substrate 3b comprises a vertical batten 3b1 that extends vertically and is attached to the column 3a1 via a plate 3a5, and an exterior insulation material 3b2 provided to the side of the vertical batten 3b1 in a region away from the opening A1.

[0019] The sliding window 3c is attached to a pair of columns 3a1 and a bottom rail 3a2 from the outside so as to fit into the opening A1. Specifically, the sliding window 3c has a window frame 3c1 attached to the columns 3a1 and the bottom rail 3a2 of the structural wall 3a, a lower projection (an example of a covering) 3c2 that protrudes inward from the bottom of the window frame 3c1, side projections 3c3 (only one is shown in Figures 1 and 2) that protrude inward from both horizontal ends of the window frame 3c1, and a pair of sliding doors 3c4 that are slidably attached to the window frame 3c1 within the window frame 3c1. The lower projection 3c2 extends horizontally along the edge of the floor surface material 5 (upper surface material 5b, described later) to cover the outside edge of the floor surface material from above. The side projection 3c3 forms a storage space S1 between itself and the vertical surface 3a1a of the column 3a1 facing the opening A1, for storing the exterior end of the picture frame (not shown). Specifically, the side projection 3c3 faces the surface of the column 3a1 facing the opening A1 and extends along the vertical direction. In this embodiment, the lower projection 3c2 is provided across a pair of adjacent side projections 3c3 (only one is shown in Figures 1 and 2).

[0020] The floor underlayment 4 comprises a plurality of posts 4a (only one is shown in Figure 2) provided on the base portion 2a of the foundation 2, a main beam 4b (only one is shown in Figure 2) provided on each of the posts 4a, a plurality of joists 4c (only one is shown in Figure 2) provided on the main beams 4b, a floor support member 4d attached to the height adjustment member 3a3 of the exterior wall portion 3 and supporting the floor surface material 5 together with the joists 4c, and a floor insulation material 4e provided on the interior side of the floor support member 4d.

[0021] Multiple main beams 4b extend in one horizontal direction (perpendicular to the plane of the paper in Figure 2) and are spaced apart in the other horizontal direction (left-right direction in Figure 2). Each main beam 4b is supported by multiple supports 4a spaced apart along the longitudinal direction of the main beam 4b. Multiple joists 4c extend in a direction perpendicular to the longitudinal direction of the main beams 4b in the horizontal direction (left-right direction in Figure 2) and are spaced apart along the longitudinal direction of the main beams 4b. Each joist 4c is supported by multiple main beams 4b spaced apart along the longitudinal direction of the joist 4c.

[0022] 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 such that the support surface 4d1 is positioned below the upper surface 3a3a of the height adjustment member 3a3. Specifically, the floor support member 4d has an opening edge portion 4d2 that extends horizontally along the lower edge of the opening A1, and an opening outer portion 4d3 that extends horizontally from the opening edge portion 4d2 toward a region outside the opening A1, and the support surface 4d1 is provided over the opening edge portion 4d2 and the opening outer portion 4d3. In this embodiment, the upper surface 3a3a of the height adjustment member 3a3 corresponds to the lower horizontal plane of a pair of vertically opposing horizontal planes (the lower surface of the upper plane and the upper surface 3a3a of the height adjustment member 3a3) in the opening forming member (a pair of columns 3a1, a lower rail 3a2, a height adjustment member 3a3, and an upper rail (not shown)). The support surface 4d1 of the floor support member 4d is provided at the same height as the upper surface of the joist 4c, and the floor support member 4d supports the floor surface material 5 together with the joist 4c. The upper surface 3a3a of the height adjustment member 3a3 supports the upper layer surface material 5b of the floor surface material 5, which will be described later. However, since the upper layer surface material 5b is supported by the lower layer surface material 5a, in this embodiment, the floor surface material 5 is substantially supported by the floor support member 4d and the joist 4c, which support the lower layer surface material 5a.

[0023] The floor insulation material 4e is installed on the interior side of the floor support member 4d between adjacent joists 4c and between the flexible insulation material 6d and the floor surface material 5. The floor insulation material 4e, flexible insulation material 6d, interior insulation material 6b, and base insulation material 6a provide continuous insulation from the base portion 2a to the rising portion 2b of the foundation 2.

[0024] The floor panel 5 comprises a lower panel 5a supported by joists 4c and floor support members 4d, and an upper panel 5b laminated on top of the lower panel 5a.

[0025] The lower panel 5a is placed on the upper surface of the joist 4c and the support surface 4d1 of the floor support member 4d. Specifically, the lower panel 5a has a portion provided on the opening edge portion 4d2 of the floor support member 4d and a portion provided on the outer portion 4d3 of the opening. The vertical height dimension of the lower inner surface 3a3b that extends downward from the interior edge of the height adjustment member 3a3 and faces the interior is set to a dimension corresponding to the thickness dimension of the lower panel 5a. Therefore, by placing the lower panel 5a on the support surface 4d1 of the floor support member 4d, the upper surface of the lower panel 5a and the upper surface 3a3a of the height adjustment member 3a3 are arranged on the same plane. Furthermore, the lower inner surface 3a3b of the height adjustment member 3a3 is arranged on the same plane as the lateral inner surface 3a1b (the interior-facing surface of the column 3a1) which extends horizontally from the lower inner surface 3a3b beyond one of the vertical surfaces 3a1a in the outer wall portion 3 and faces the interior, and the interior-facing surface of the inner insulation material 3a4. In this embodiment, the lower surface material 5a has a substantially rectangular shape in plan view, with side edges that extend across the lower inner surface 3a3b and the lateral inner surface 3a1b.

[0026] The upper layer facing material 5b is provided on top of the lower layer facing material 5a so as to cover the lower layer facing material 5a and the upper surface 3a3a (lower horizontal plane) of the height adjustment member 3a3. Specifically, the upper layer facing material 5b has an overlapping portion 5b1 that is positioned to overlap the joist 4c and the floor support member 4d (lower layer facing material 5a), and a protruding portion 5b2 that extends from the overlapping portion 5b1 into the opening A1 and covers the upper surface 3a3a of the height adjustment member 3a3. The overlapping portion 5b1 has a portion that overlaps with the opening edge portion 4d2 of the floor support member 4d and a portion that overlaps with the outer portion 4d3 of the opening. As shown in Figure 3, a vertical gap corresponding to the thickness dimension of the protruding portion 5b2 of the upper layer facing 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 edge of the protruding portion 5b2 of the upper panel 5b under the lower protruding portion 3c2 of the window frame 3c1, the outdoor edge of the protruding portion 5b2 of the upper panel 5b can be covered by the lower protruding portion 3c2. In other words, the sliding window 3c has a lower protruding portion 3c2 (an example of a covering portion) attached to the lower rail 3a2, such that a vertical gap corresponding to the thickness dimension of the upper panel 5b is formed between it and the upper surface 3a3a of the height adjustment member 3a3, in order to cover the outdoor edge of the upper panel 5b from above.

[0027] Referring to Figure 1, the airtight member 7 is intended to form a continuous airtight line from the outer 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 the portion of the outer wall 3 outside the opening A1 to the foundation 2, a second airtight member 7b extending from the portion of the outer wall 3 outside the opening A1 to the portion inside the opening A1 to the foundation 2, and a third airtight member 7c extending from the portion inside the opening A1 to the foundation 2. These first airtight member 7a, second airtight member 7b, and third airtight member 7c are arranged horizontally, and adjacent airtight members are connected by airtight tape (not shown). The airtight members 7a to 7c are made of an airtight material (for example, polypropylene (PP) sheet, polyethylene (PE) sheet, polyester sheet, ethylene vinyl acetate (EVA) sheet).

[0028] As shown in Figure 1, the first airtight member 7a comprises a first support surface arrangement portion 7a1, a first wall inner surface arrangement portion 7a2, a first member inner surface arrangement portion 7a3, a first member lower surface arrangement portion 7a4, and a first foundation arrangement portion 7a5. The first support surface arrangement portion 7a1 is arranged on the support surface 4d1 along the support surface 4d1 of the floor support member 4d. The first wall inner surface arrangement portion 7a2 extends upward from the exterior edge of the first support surface arrangement portion 7a1 and is arranged along the lateral inner surface 3a1b of the column 3a1 and the interior-facing surface of the inner insulation material 3a4. The first member inner surface arrangement portion 7a3 extends downward from the interior edge of the first support surface arrangement portion 7a1 and is arranged along the interior-facing surface of the floor support member 4d. The first member lower surface arrangement portion 7a4 extends outward from the lower edge of the first member inner surface arrangement portion 7a3 and is arranged along the lower surface of the floor support member 4d. The first foundation placement section 7a5 extends downward from the outdoor-facing edge of the first member lower surface placement section 7a4 and is positioned along the inner surface of the foundation 2 (rising section 2b).

[0029] Figure 2 is a cross-sectional view taken along line II-II in Figure 1, showing the airtight structure 1 cut across the plane between the side projection 3c3 of the window frame 3c1 and the column 3a1. Figure 4 is a perspective view showing the airtight members disassembled in the airtight structure of Figure 1. Figure 5 is an enlarged perspective view showing the second airtight member 7b.

[0030] Referring to Figures 2, 4, and 5, the second airtight member 7b comprises a second horizontal arrangement portion 7ba, a second lower inner surface arrangement portion 7bb, a second support surface arrangement portion 7bc, a second member inner surface arrangement portion 7bd, a second member lower surface arrangement portion 7be, a second foundation arrangement portion 7bf, and a second joinery arrangement portion 7bg. The second horizontal arrangement portion 7ba is arranged along the upper surface 3a3a of the height adjustment member 3a3. The second lower inner surface arrangement portion 7bb extends downward from the interior-side edge of the second horizontal arrangement portion 7ba and is arranged along the lower inner surface 3a3b of the height adjustment member 3a3. The second support surface arrangement portion 7bc extends inward from the lower edge of the second lower inner surface arrangement portion 7bb and is arranged along the support surface 4d1 of the floor support member 4d. The second member inner surface arrangement portion 7bd extends downward from the interior edge of the second support surface arrangement portion 7bc and is arranged along the interior-facing surface of the floor support member 4d. The second member lower surface arrangement portion 7be extends outward from the lower edge of the second member inner surface arrangement portion 7bd and is arranged along the lower surface of the floor support member 4d. The second foundation arrangement portion 7bf extends downward from the exterior edge of the second member lower surface arrangement portion 7be and is arranged along the interior surface of the foundation 2 (rising portion 2b). The second joinery arrangement portion 7bg extends upward from the exterior edge of the second horizontal arrangement portion 7ba and is arranged along the interior-facing surface of the window frame 3c1 of the sliding window 3c (the surface facing inward in the area opposite to the opening A1 of the side projection portion 3c3). The second member inner surface arrangement portion 7bd, the second member lower surface arrangement portion 7be, and the second foundation arrangement portion 7bf correspond to foundation connection 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.

[0031] Furthermore, the second airtight member 7b has a second vertical arrangement portion 7bh and a second horizontal inner surface arrangement portion 7bi. The second vertical arrangement portion 7bh extends upward from the edge of the column 3a1 that is close to the vertical surface 3a1a in the second horizontal arrangement portion 7ba and is arranged along the vertical surface 3a1a, and is connected to the second joinery arrangement portion 7bg. The second horizontal inner surface arrangement portion 7bi extends horizontally from the interior-side edge of the second vertical arrangement portion 7bh and is arranged along the horizontal inner surface 3a1b of the column 3a1 and the interior-facing surface of the inner insulation material 3a4.

[0032] The second lower inner surface arrangement portion 7bb includes a lower inner surface main body portion 7bb1 connected to the second horizontal arrangement portion 7ba, and a lower inner surface extension portion 7bb2 that extends horizontally from the lower inner surface main body portion 7bb1 and is connected to the second lateral inner surface arrangement portion 7bi.

[0033] The second support surface arrangement portion 7bc includes a support surface main body portion 7bc1 connected to the lower inner surface main body portion 7bb1, and a support surface extension portion 7bc2 that extends horizontally from the support surface main body portion 7bc1 and is connected to the lower inner surface extension portion 7bb2.

[0034] The second member inner surface arrangement portion 7bd includes a member inner surface body portion 7bd1 connected to the support surface body portion 7bc1, and a member inner surface extension portion 7bd2 extending horizontally from the member inner surface body portion 7bd1 and connected to the support surface extension portion 7bc2.

[0035] The second member lower surface arrangement portion 7be includes a member lower surface body 7be1 connected to the member inner surface body portion 7bd1, and a member lower surface extension portion 7be2 extending horizontally from the member lower surface body 7be1 and connected to the member inner surface extension portion 7bd2.

[0036] The second foundation arrangement section 7bf includes a foundation body 7bf1 connected to the member lower surface body 7be1, and a foundation extension section 7bf2 that extends horizontally from the foundation body 7bf1 and is connected to the member lower surface extension section 7be2.

[0037] Figure 3 is a cross-sectional view taken along line III-III in Figure 1, showing the airtight structure 1 cut through a plane passing through the lower protrusion 3c2 of the window frame 3c1.

[0038] Referring to Figures 3 and 4, the third airtight member 7c comprises a third horizontal arrangement portion 7ca, a third lower inner surface arrangement portion 7cb, a third support surface arrangement portion 7cc, a third member inner surface arrangement portion 7cd, a third member lower surface arrangement portion 7ce, a third foundation arrangement portion 7cf, and a third joinery arrangement portion 7cg. The third horizontal arrangement portion 7ca is arranged along the upper surface 3a3a of the height adjustment member 3a3. The third lower inner surface arrangement portion 7cb extends downward from the interior-side edge of the third horizontal arrangement portion 7ca and is arranged along the lower inner surface 3a3b of the height adjustment member 3a3. The third support surface arrangement portion 7cc extends inward from the lower edge of the third lower inner surface arrangement portion 7cb and is arranged along the support surface 4d1 of the floor support member 4d. The third member inner surface arrangement portion 7cd extends downward from the interior edge of the third support surface arrangement portion 7cc and is arranged along the interior-facing surface of the floor support member 4d. The third member lower surface arrangement portion 7ce extends outward from the lower edge of the third member inner surface arrangement portion 7cd and is arranged along the lower surface of the floor support member 4d. The third foundation arrangement portion 7cf extends downward from the exterior edge of the third member lower surface arrangement portion 7ce and is arranged along the interior surface of the foundation 2 (rising portion 2b). The third joinery arrangement portion 7cg extends upward from the exterior edge of the third horizontal arrangement portion 7ca and is arranged along the interior-facing surface of the window frame 3c1 of the sliding window 3c (the surface facing inward below the lower protrusion 3c2). The third member inner surface arrangement portion 7cd, the third member lower surface arrangement portion 7ce, and the third foundation arrangement portion 7cf correspond to foundation connection 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.

[0039] Figure 6 is an exploded perspective view of the third airtight member 7c. As shown in Figures 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 horizontal arrangement portion 7ca and a third joinery arrangement portion 7cg. The second piece 7cB has a portion corresponding to a part of the third horizontal arrangement portion 7ca and a third lower inner surface arrangement portion 7cb. The third piece 7cC has a third lower inner surface arrangement portion 7cb, a third support surface arrangement portion 7cc, a third member inner surface arrangement portion 7cd, a third member lower surface arrangement portion 7ce, and a third foundation arrangement portion 7cf. The first piece 7cA and the second piece 7cB are joined together with their portions 7cA1 and 7cB1, which correspond to a part of the third horizontal arrangement portion 7ca, overlapping each other. The second piece 7cB and the third piece 7cC are joined together with their portions 7cb, which are the third lower inner surface arrangement portions 7cb, overlapping each other.

[0040] In this embodiment, the third airtight member 7c is formed by joining together the first piece 7cA, the second piece 7cB, and the third piece 7cC, but it may also be formed from a single piece. On the other hand, in this embodiment, the first airtight member 7a and the second airtight member 7b are formed from a single piece, but they may also be formed by joining together multiple pieces. By preparing the second airtight member 7b and the third airtight member 7c having the above-described configuration as a single piece 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.

[0041] The following describes the procedure for constructing the airtight structure 1 using airtight members 7a to 7c.

[0042] First, prepare the structures shown in Figures 4 and 7. Specifically, in this structure, only the outer insulation material 6c of the foundation insulation material 6 is provided to 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.

[0043] Next, as shown in FIG. 1, the first airtight member 7a is attached to the area deviated from the opening in the configuration shown in FIG. 4. Specifically, the first support surface arrangement portion 7a1 is arranged along the support surface 4d1, the first inner wall surface arrangement portion 7a2 is arranged along the lateral inner surface 3a1b of the column 3a1 and the surface facing the interior of the inner heat insulating material 3a4, and the first member inner surface arrangement portion 7a3 is arranged along the surface facing the interior of the floor support member 4d. Further, the first member lower surface arrangement portion 7a4 is arranged along the lower surface of the floor support member 4d, and the first foundation arrangement portion 7a5 is arranged along the surface facing the interior of the foundation 2 (rising portion 2b). Note that an adhesive layer is provided on the whole or a part of the surface 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 joined to the foundation 2, the outer wall portion 3, and the floor support member 4d via the adhesive layer. The adhesive layer may be provided by a double-sided tape or may be formed by an adhesive.

[0044] Next, the second airtight member 7b is attached across the area deviated from the opening and the area within the opening in the configuration shown in FIG. 4. Specifically, as shown in FIGS. 2 and 4, the second horizontal arrangement portion 7ba is arranged along the upper surface 3a3a of the height adjustment member 3a3, the second lower inner surface arrangement portion 7bb is arranged along the lower inner surface 3a3b of the height adjustment member 3a3, and the second support surface arrangement portion 7bc is arranged along the support surface 4d1. Further, the second member inner surface arrangement portion 7bd is arranged along the surface facing the interior of the floor support member 4d, the second member lower surface arrangement portion 7be is arranged along the lower surface of the floor support member 4d, and the second foundation arrangement portion 7bf is arranged along the surface facing the interior of the foundation 2 (rising portion 2b). Also, the second fitting arrangement portion 7bg is arranged along the surface facing the interior of the window frame 3c1, the second vertical arrangement portion 7bh is arranged along the vertical surface 3a1a of the column 3a1, and the second lateral inner surface arrangement portion 7bi is arranged along the lateral inner surface 3a1b of the column 3a1. Note that an adhesive layer is provided on the whole or a part of the surface of the second airtight member 7b facing the foundation 2, the outer wall portion 3, the floor support member 4d, and the window frame 3c1, and the second airtight member 7b is joined to the foundation 2, the outer wall portion 3, the floor support member 4d, and the window frame 3c1 via the adhesive layer. The adhesive layer may be provided by a double-sided tape or may be formed by an adhesive.

[0045] Next, the third airtight member 7c is attached to the area inside the opening in the configuration shown in Figure 4. Specifically, as shown in Figures 4 and 8, the third horizontal arrangement portion 7ca is arranged along the upper surface 3a3a of the height adjustment member 3a3, the third internal arrangement portion 7cd is arranged along the lower inner surface 3a3b of the height adjustment member 3a3, and the third support surface arrangement portion 7cc is arranged along the support surface 4d1. Furthermore, the third internal arrangement portion 7cd is arranged along the interior-facing surface of the floor support member 4d, the third lower surface arrangement portion 7ce is arranged along the lower surface of the floor support member 4d, and the third foundation arrangement portion 7cf is arranged along the interior-facing surface of the foundation 2 (rising portion 2b). In addition, the third joinery arrangement portion 7cg is arranged along the interior-facing surface of the window frame 3c1. Furthermore, an adhesive layer is provided on all or part of the surface of the third airtight member 7c that faces the foundation 2, the outer wall portion 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 portion 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 formed by an adhesive.

[0046] Next, as shown in Figure 9, an inner insulation material 6b and a flexible insulation material 6d are provided for the foundation 2, and a post 4a is erected on the base portion 2a of the foundation 2, and a main beam 4b is installed on the post 4a. Furthermore, a joist is installed on the main beam 4b, and a floor insulation material 4e is installed on the flexible insulation material 6d.

[0047] Furthermore, as shown in Figure 10, the lower layer facing material 5a is installed on the support surface 4d1 of the floor support member 4d (first support surface arrangement section 7a1, second support surface arrangement section 7bc, and third support surface arrangement section 7cc). Specifically, the lower layer facing material 5a is installed so as to fit into the stepped portion formed by the height adjustment member 3a3 and the floor support member 4d. Furthermore, the upper layer facing material 5b is installed on the lower layer facing material 5a so as to cover the lower layer facing material 5a and the upper surface 3a3a of the height adjustment member 3a3 (second horizontal arrangement section 7ba and third horizontal arrangement section 7ca). At this time, the upper layer facing material 5b is installed so that the outdoor edge of the upper layer facing 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 makes it possible to construct the airtight structure 1 as shown in Figures 2 and 3.

[0048] As described above, in the airtight structure 1, at the mating portion between the floor support member 4d and the floor material 5, the support surface 4d1 is disposed below the upper surface 3a3a (lower horizontal plane) of the height adjustment member 3a3, whereby a step for fitting the floor material 5 between the opening forming member (pair of columns 3a1, lower crosspiece 3a2, height adjustment member 3a3, and upper crosspiece (not shown)) and the floor support member 4d is formed. In this configuration, in order to form an airtight state from the opening forming member to the floor support member 4d, it is necessary to form an airtight line along the path extending across the upper surface 3a3a, the surface of the opening forming member facing the interior of the room (lower inner surface 3a3b of the height adjustment member 3a3), and the support surface 4d1. In the present invention, since the second airtight member 7b and the third airtight member 7c have shapes that can be disposed along the path of the airtight line, the construction work of the airtight members 7b and 7c for forming an airtight line at the mating portion between the floor support member 4d and the floor material 5 can be simplified.

[0049] According to the above configuration, since the second airtight member 7b and the third airtight member 7c have the second fixture arrangement portions 7bg and the third fixture arrangement portions 7cg, an airtight line continuous from the sweep-out window 3c to the floor support member 4d can be easily formed.

[0050] According to the above configuration, since the vertical dimension of the lower inner surface 3a3b is set to a dimension corresponding to the thickness dimension of the lower floor material 5a, by disposing the lower floor material 5a on the support surface 4d1, the upper surface of the lower floor material 5a and the upper surface 3a3a (horizontal arrangement portions 7ba, 7ca) can be disposed on the same plane. By laminating the upper floor material 5b on these lower floor material 5a and upper surface 3a3a, the airtight members 7b and 7c can be covered to finish the floor surface.

[0051] According to the above configuration, the airtight members 7b and 7c can be covered by disposing the upper floor material 5b, and further, by covering the edge portion on the outdoor side of this upper floor material 5b with the lower protruding portion (an example of a covering portion) 3c2, the edge portion of the upper floor material 5b can be housed in the sweep-out window 3c.

[0052] According to the above configuration, in the opening forming member, the lower inner surface 3a3b, the interior-facing surface of the column 3a1, and the interior-facing surface of the inner insulation material 3a4 are arranged on the same plane. As a result, the exterior edge of the lower surface material 5a 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 flooring materials installed in the building at locations other than the sliding windows 3c.

[0053] According to the above configuration, since the airtight members 7b and 7c have foundation connection portions (second member inner surface arrangement portion 7bd, second member lower surface arrangement portion 7be, second foundation arrangement portion 7bf, third member inner surface arrangement portion 7cd, third member lower surface arrangement portion 7ce, and third foundation arrangement portion 7cf), a continuous airtight line can be easily formed from the sliding window 3c to the foundation 2.

[0054] According to the above configuration, since the second airtight member 7b has a second vertical arrangement portion 7bh, a second horizontal inner surface arrangement portion 7bi, a lower inner surface extension portion 7bb2, and a support surface extension portion 7bc2, the second airtight member 7b can be easily arranged over the opening A1 and the area horizontally away from the opening A1.

[0055] The specific embodiments described above mainly include inventions having the following configurations.

[0056] An airtight structure for a building according to one aspect of the present invention comprises: an opening forming member that forms an opening surrounded by a pair of vertically opposing horizontal planes and a pair of horizontally opposing vertical planes; a floor support member having a support surface for supporting a floor surface material, and attached to the opening forming member such that the support surface is positioned below the lower horizontal plane, which is located below the pair of horizontal planes; an airtight member having a horizontal arrangement portion positioned along the lower horizontal plane; a lower inner surface arrangement portion that extends downward from the interior-side edge of the horizontal arrangement portion and is positioned along the lower inner surface of the opening forming member that extends downward from the interior-side edge of the lower horizontal plane and faces the interior; and a support surface arrangement portion that extends inward from the lower edge of the lower inner surface arrangement portion and is positioned along the support surface.

[0057] In the aforementioned airtight structure, at the interface between the floor support member and the floor surface material, the support surface is positioned below the lower horizontal plane, thereby creating a step between the opening-forming member and the floor support member for fitting the floor surface material. In this configuration, in order to create an airtight state from the opening-forming member to the floor support member, it is necessary to form an airtight line along the path spanning the lower horizontal plane, the interior-facing surface of the opening-forming member, and the support surface. In the aforementioned airtight structure, since the airtight member has a shape that can be positioned along the path of the airtight line, the construction work of the airtight member for forming an airtight line at the interface between the floor support member and the floor surface material can be simplified.

[0058] The airtight structure further comprises a door or window attached to the opening forming member from the outside so as to fit into the opening, and preferably the airtight member has a door or window arrangement portion that extends upward from the outside edge of the horizontal arrangement portion and is arranged along the interior-facing surface of the door or window.

[0059] According to the aforementioned airtight structure, since the airtight member has a section for arranging the door or window, a continuous airtight line can be easily formed from the door or window to the floor support member.

[0060] In the airtight structure of the building, the floor material comprises 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, and it is preferable that the vertical height dimension of the lower inner surface of the opening forming member is set to a dimension corresponding to the thickness dimension of the lower surface material.

[0061] According to the airtight structure described above, the vertical dimension of the lower inner surface is set to a dimension corresponding to the thickness of the lower layer surface material. Therefore, by placing the lower layer surface material on the support surface, the upper surface of the lower layer surface material and the lower horizontal surface (the horizontally positioned part of the airtight member) can be placed on the same plane. By laminating the upper layer surface material on top of these lower layer surface material and lower horizontal surface, the airtight member can be covered and the floor surface can be finished.

[0062] In the aforementioned airtight structure, it is preferable that the joinery has a covering portion attached to the opening forming member such that a vertical gap corresponding to the thickness dimension of the upper surface material is formed between it and the lower horizontal plane, in order to cover the exterior edge of the upper surface material from above.

[0063] According to the airtight structure described above, the airtight member can be covered by arranging the upper surface material, and furthermore, the edge of the upper surface material can be housed within the door or window by covering the exterior edge of the upper surface material with the covering part.

[0064] In the airtight structure of the building, it is preferable that the lower inner surface of the opening-forming member is on the same plane as a horizontal inner surface that extends horizontally from the lower inner surface of the opening-forming member beyond one vertical plane and faces the interior of the room.

[0065] According to the airtight structure described above, since the lower inner surface and the lateral inner surface of the opening-forming member are arranged on the same plane, the outer edge of the lower floor surface material can be made straight, simplifying the shape of the lower floor surface material. This makes it possible to share the lower surface material with floor surface materials installed in locations other than doors and windows in a building.

[0066] The airtight structure of the building further comprises a foundation on which the opening-forming member is placed and which supports the opening-forming member, and the airtight member preferably has a foundation connection portion that extends downward from the interior-facing edge of the support surface arrangement portion and is connected to the interior-facing surface of the foundation.

[0067] According to the aforementioned airtight structure, since the airtight member has a foundation connection portion, a continuous airtight line can be easily formed from the joinery to the foundation.

[0068] The airtight structure of the building, wherein the airtight member has a vertical arrangement portion that extends upward from an edge near one of the pair of vertical surfaces in the horizontal arrangement portion and is arranged along the one vertical surface, and a horizontal interior arrangement portion that extends horizontally from the interior side edge of the vertical arrangement portion and is arranged along a horizontal interior surface that extends horizontally from the lower interior surface beyond the one vertical surface in the opening forming member and faces the interior, wherein the lower interior arrangement portion has a lower interior main body portion connected to the horizontal arrangement portion and a lower interior extension portion that extends horizontally from the lower interior main body portion and is connected to the horizontal interior arrangement portion, and the support surface arrangement portion has a support surface main body portion connected to the lower interior arrangement portion and a support surface extension portion that extends horizontally from the support surface main body portion and is connected to the lower interior extension portion.

[0069] According to the airtight structure described above, since the airtight member has a vertically positioned portion, a horizontally positioned portion, a lower inner surface extension portion, and a support surface extension portion, the airtight member can be easily positioned over the opening and the area horizontally away from the opening.

Claims

1. An airtight structure for a building, comprising: an opening forming member that forms an opening surrounded by a pair of vertically opposing horizontal planes and a pair of horizontally opposing vertical planes; a floor support member having a support surface for supporting a floor surface material, and attached to the opening forming member such that the support surface is positioned below the lower horizontal plane, which is the lower of the pair of horizontal planes; an airtight member having a horizontal arrangement portion positioned along the lower horizontal plane; a lower inner surface arrangement portion that extends downward from the interior-side edge of the horizontal arrangement portion and is positioned along the lower inner surface of the opening forming member that extends downward from the interior-side edge of the lower horizontal plane and faces the interior; and a support surface arrangement portion that extends inward from the lower edge of the lower inner surface arrangement portion and is positioned along the support surface.

2. The airtight structure of a building according to claim 1 further comprises a joinery attached to the opening forming member from the outside so as to be fitted into the opening, wherein the airtight member has a joinery arrangement portion that extends upward from the outside edge of the horizontal arrangement portion and is arranged along the interior-facing surface of the joinery.

3. An airtight structure for a building according to claim 2, wherein the floor surface material comprises 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, and the vertical height dimension of the lower inner surface of the opening forming member is set to a dimension corresponding to the thickness dimension of the lower surface material.

4. An airtight structure for a building according to claim 3, wherein the joinery has a covering portion attached to the opening forming member such that a vertical gap corresponding to the thickness dimension of the upper surface material is formed between it and the lower horizontal plane, in order to cover the exterior edge of the upper surface material from above.

5. An airtight structure for a building according to claim 3 or 4, wherein the lower inner surface of the opening-forming member is on the same plane as a horizontal 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. An airtight structure for a building according to any one of claims 1 to 5, further comprising a foundation on which the opening forming member is placed and which supports the opening forming member, wherein the airtight member has a foundation connection portion that extends downward from the interior-side edge of the support surface arrangement portion and is connected to the interior-facing surface of the foundation.

7. An airtight structure for a building according to any one of claims 1 to 6, wherein the airtight member comprises a vertical arrangement portion that extends upward from an edge near one of the pair of vertical surfaces in the horizontal arrangement portion and is arranged along the one vertical surface, and a horizontal interior arrangement portion that extends horizontally from the interior-side edge of the vertical arrangement portion and is arranged along a horizontal interior surface that extends horizontally from the lower interior surface beyond the one vertical surface in the opening forming member and faces the interior, the lower interior arrangement portion comprises a lower interior main body portion connected to the horizontal arrangement portion and a lower interior extension portion that extends horizontally from the lower interior main body portion and is connected to the horizontal interior arrangement portion, and the support surface arrangement portion comprises a support surface main body portion connected to the lower interior arrangement portion and a support surface extension portion that extends horizontally from the support surface main body portion and is connected to the lower interior extension portion, an airtight structure for a building.

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