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

Title of Invention AIRTIGHT STRUCTURE OF BUILDING Technical Field

[0001] The present invention relates to an airtight structure of a building. Background Art

[0002] Conventionally, for example, an airtight structure recited in Patent Literature 1 is known.

[0003] The airtight structure recited in Patent Literature 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 portion at a viewpoint viewed along the predetermined direction, a surrounding surface surrounding the opening, and an outer surface extending from one end portion of the surrounding surface in the predetermined direction toward a direction away from the opening. The airtight sheet has a predetermined folding line for forming a portion along one surface of a 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 recited in Patent Literature 1, by bending the airtight sheet along the folding line, the airtight sheet can be provided continuously from one surface and the other surface at the corner portion, and further from these surfaces to the outer surface.

[0005] Although an opening provided in a wall may be provided with a fitting, for example, when a sweep-out window is provided, a structure at a portion where a lower portion of the sweep-out window and a floor surface material are engaged with each other becomes complicated.

[0006] Therefore, in a case of adopting a configuration of folding the airtight sheet at the predetermined folding line as recited in Patent Literature 1, there is a problem that the number of bent portions and directions of bending increase, and construction work of the airtight sheet becomes complicated. Citation List Patent Literature

[0007] Patent Literature 1: JP 2024-108310 A Summary of Invention

[0008] An object of the present invention is to provide an airtight structure of a building that enables simplification of construction work of an airtight member at a portion where an opening and a floor surface material are engaged with each other.

[0009] In order to solve the above problem, an airtight structure of a building according to one aspect of the present invention includes: an opening forming member that forms an opening surrounded by a pair of horizontal surfaces opposed to each other in a vertical direction and a pair of vertical surfaces opposed to each other in a horizontal direction; a floor support member having a support surface for supporting a floor surface material, the floor support member being 1 attached to the opening forming member such that the support surface is arranged below a lower horizontal surface located below out of the pair of horizontal surfaces; and an airtight member having: a horizontal arrangement portion to be arranged along the lower horizontal surface; a lower inner surface arrangement portion extending downward from an indoor-side edge portion of the horizontal arrangement portion, and being to be arranged along a lower inner surface facing an indoor side, the lower inner surface extending downward from an indoor-side edge portion of the lower horizontal surface in the opening forming member ; and a support surface arrangement portion extending from a lower edge portion of the lower inner surface arrangement portion toward the indoor side and being to be arranged along the support surface.

[0010] According to the present invention, it is possible to simplify construction work of the airtight member at a portion where the opening and the floor surface material are engaged with each other. Brief Description of Drawings

[0011] FIG. 1 is a perspective partial cross-sectional view illustrating, in an exploded manner, surface materials of a cut out part of an airtight structure of a building according to the present invention. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1. FIG. 4 is a perspective view illustrating an airtight member in an exploded manner in the airtight structure of FIG. 1. FIG. 5 is a perspective view illustrating a corner portion airtight member of FIG. 4 in an enlarged manner. FIG. 6 is a perspective view of an opening portion airtight member of FIG. 4 in enlarged and exploded manners. FIG. 7 is a cross-sectional view illustrating a procedure for constructing the airtight structure of FIG. 1, and illustrates a state before attachment of the airtight member. FIG. 8 is a cross-sectional view illustrating a procedure for constructing the airtight structure of FIG. 1, and illustrates a state in which the opening portion airtight member is attached. FIG. 9 is a cross-sectional view illustrating a procedure for constructing the airtight member of FIG. 1, and is a cross-sectional view illustrating a state in which a heat insulating material, a strut, a sleeper, and a joist are attached. FIG. 10 is a cross-sectional view illustrating a procedure for constructing the airtight member of FIG. 1, and is a cross-sectional view illustrating a state in which a floor surface material is attached. Description of Embodiment

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Note that the following embodiment is an example embodying the present invention and does not limit a technical scope of the present invention. 2

[0013] FIG. 1 is a perspective partial cross-sectional view illustrating, in an exploded manner, surface materials of a cut out part of an airtight structure of a building according to the present invention. In addition, FIG. 2 is a cross-sectional view taken along line II-1I in FIG. 1.

[0014] With reference to FIGS. 1 and 2, an airtight structure 1 of a building includes a foundation 2, an outer wall portion 3 provided on a rising portion 2b of the foundation 2, an underfloor base material 4 provided on a base portion 2a of the foundation 2, a floor surface material 5 provided on the underfloor base material 4, a foundation heat insulating material 6 provided on the foundation 2, and an airtight member 7 provided from the foundation 2 to the outer wall portion 3.                              '

[0015] The outer wall portion 3 is placed on the foundation 2 that supports the outer wall portion 3. Specifically, the foundation 2 includes the base portion 2a extending in a horizontal direction and the rising portion 2b rising from the base portion 2a in a vertical direction. The foundation heat insulating material 6 has a base heat insulating material 6a provided along an upper surface of the base portion 2a, an inner heat insulating material 6b provided along an inner surface of the rising portion 2b on the base heat insulating material 6a, an outer heat insulating material 6c provided along an outer surface of the rising portion 2b, and a soft heat insulating material 6d provided between the inner heat insulating material 6b and the underfloor base material 4 and having higher flexibility than the inner heat insulating material 6b.

[0016] The outer wall portion 3 is erected on the rising portion 2b along the rising portion 2b of the foundation 2 and has an opening Al. Specifically, the outer wall portion 3 has a structural wall portion 3a erected on the rising portion 2b of the foundation 2, an outer wall base 3b erected on the rising portion 2b outside the structural wall portion 3a, and a sweep-out window (an example of a fitting) 3 c attached to the structural wall portion 3 a.

[0017] The structural wall portion 3a includes a plurality of columns 3al (only one is shown in FIGS. 1 and 2) erected on the rising portion 2b, a lower crosspiece 3a2 provided between lower end portions of a pair of the columns 3al opposed to each other with the opening Al interposed therebetween, an upper crosspiece (not illustrated) provided between upper end portions of the pair of columns 3al opposed to each other with the opening Al interposed therebetween, a height adjustment member 3a3 provided on the lower crosspiece 3a2, an inner heat insulating material 3a4 provided between two columns 3al adjacent to each other at a position opposite to the opening Al, and a plate material 3a5 fixed to the column 3al so as to cover the inner heat insulating material 3a4 from the outside. In the present embodiment, the pair of columns 3al opposed to each other with the opening Al interposed therebetween, the lower crosspiece 3a2, the height adjustment member 3a3, and the upper crosspiece (not illustrated) correspond to an opening forming member for forming the opening Al surrounded by a pair of horizontal surfaces opposed to each other in the vertical direction and a pair of vertical surfaces (vertical surfaces 3ala of the column 3al) opposed to each other in the horizontal direction.

[0018] The outer wall base 3b is provided at a position deviated from the opening Al in the horizontal direction. Specifically, the outer wall base 3b includes a vertical crosspiece 3b 1 3 extending in the vertical direction and attached to the column 3al via the plate material 3a5, and an outer heat insulating material 3b2 provided on a side of the vertical crosspiece 3b 1 in an area deviated from the opening Al.

[0019] The sweep-out window 3c is attached to the pair of columns 3al and the lower crosspiece 3a2 from the outdoor side so as to be fitted into the opening Al. Specifically, the sweep-out window 3c has a window frame 3c 1 attached to the columns 3a 1 and the lower crosspiece 3a2 of the structural wall portion 3a, a lower protruding portion (an example of a covering portion) 3c2 protruding from a lower portion of the window frame 3c 1 toward the indoor side, side protruding portions 3c3 (only one is shown in FIGS. 1 and 2) protruding from opposite end portions of the window frame 3c 1 in the horizontal direction toward the indoor side, and a pair of sliding doors 3c4 slidably attached to the window frame 3cl in the window frame 3cl. The lower protruding portion 3c2 extends in the horizontal direction along an outdoor-side edge portion of the floor surface material 5 (an upper layer surface material 5b to be described later) in order to cover the edge portion from above. The side protruding portions 3c3 form a storage space SI for storing an outdoor side end portion of a frame (not illustrated) between the side protruding portion 3c3 and the vertical surface 3ala of the columns 3al facing the opening Al. Specifically, the side protruding portion 3c3 is opposed to the surface of the column 3al facing the opening Al and extends along the vertical direction. In the present embodiment, the lower protruding portion 3c2 is provided over a pair of side protruding portions 3c3 (only one is shown in FIGS. 1 and 2) adjacent to each other.

[0020] The underfloor base material 4 has a plurality of struts 4a (only one is shown in FIG. 2) provided on the base portion 2a of the foundation 2, sleepers 4b (only one is shown in FIG. 2) respectively provided on the struts 4a, a plurality of joists 4c (only one is shown in FIG. 2) provided on the sleepers 4b, a floor support member 4d attached to the height adjustment member 3a3 of the outer wall portion 3 and supporting the floor surface material 5 together with the joists 4c, and a floor heat insulating material 4e provided on an indoor side of the floor support member 4d.

[0021] The plurality of sleepers 4b extend in one direction in the horizontal direction (a direction orthogonal to a paper surface of FIG. 2) and are arranged at intervals in the other direction (a left-right direction of FIG. 2) in the horizontal direction. In addition, the respective sleepers 4b are supported by the plurality of struts 4a arranged at intervals in a longitudinal direction of the sleepers 4b. The plurality of joists 4c extend in a direction (the left-right direction in FIG. 2) orthogonal to the longitudinal direction of the sleepers 4b in the horizontal direction and are arranged at intervals in the longitudinal direction of the sleepers 4b. Furthermore, the respective joists 4c are supported by the plurality of sleepers 4b arranged at intervals in a longitudinal direction of the joists 4c.

[0022] The floor support member 4d has a support surface 4d 1 for supporting the floor surface material 5 and is attached to the height adjustment member 3a3 such that the support surface 4d 1 is arranged below an upper surface 3a3a of the height adjustment member 3a3. Specifically, the 4 floor support member 4d has an opening edge portion 4d2 extending in the horizontal direction along a lower edge portion of the opening Al, and an opening outer portion 4d3 extending from the opening edge portion 4d2 toward an area deviated from the opening Al in the horizontal direction, and is provided with the support surface 4d 1 over the opening edge portion 4d2 and the opening outer portion 4d3. In the present embodiment, the upper surface 3a3a of the height adjustment member 3a3 corresponds to a lower horizontal surface located below out of the pair of horizontal surfaces (a lower surface of the upper crosspiece and the upper surface 3a3a of the height adjustment member 3a3) opposed to each other in the vertical direction in the opening forming member (the pair of columns 3a 1, the lower crosspiece 3a2, the height adjustment member 3a3, and the upper crosspiece (not illustrated)). The support surface 4d 1 of the floor support member 4d is provided at the same height position as upper surfaces of the joists 4c, and the floor support member 4d supports the floor surface material 5 together with the joists 4c. The upper surface 3a3a of the height adjustment member 3a3 supports the upper layer surface material 5b, which will be described later, of the floor surface material 5. However, since the upper layer surface material 5b is supported by a lower layer surface material 5a, the floor support member 4d and the joists 4c that support the lower layer surface material 5a substantially support the floor surface material 5 in the present embodiment.

[0023] The floor heat insulating material 4e is provided between the joists 4c adjacent to each other on the indoor side of the floor support member 4d and between the soft heat insulating material 6d and the floor surface material 5. The floor heat insulating material 4e, the soft heat insulating material 6d, the inner heat insulating material 6b, and the base heat insulating material 6a cause continuous provision of the heat insulating material from the base portion 2a to the rising portion 2b of the foundation 2.

[0024] The floor surface material 5 has the lower layer surface material 5a supported by the joists 4c and the floor support member 4d, and the upper layer surface material 5b laminated on the lower layer surface material 5a.

[0025] The lower layer surface material 5a is placed on the upper surfaces of the joists 4c and the support surface 4d 1 of the floor support member 4d. Specifically, the lower layer 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. Note that a vertical height dimension of a lower inner surface 3a3b extending downward from an indoor-side edge portion of the height adjustment member 3a3 and facing the indoor side is set to a dimension corresponding to a thickness dimension of the lower layer surface material 5a. Therefore, by placing the lower layer surface material 5a on the support surface 4d 1 of the floor support member 4d, an upper surface of the lower layer surface material 5a and the upper surface 3a3a of the height adjustment member 3a3 are arranged on the same plane. In addition, the lower inner surface 3a3b of the height adjustment member 3a3 is arranged on the same plane as a lateral inner surface 3alb (a surface of the column 3al facing the indoor side) extending in the horizontal direction from the lower inner surface 3a3b beyond the one vertical surface 3ala and facing the indoor side and the same plane as a surface of the inner heat insulating material 3a4 facing the indoor side in the outer wall portion 3. In the present embodiment, the lower layer surface material 5a has a substantially rectangular shape in plan view having side portions extending over the lower inner surface 3a3b and the lateral inner surface 3alb.

[0026] The upper layer surface material 5b is provided on the lower layer surface material 5a so as to cover the lower layer surface material 5a and the upper surface 3a3a (the lower horizontal surface) of the height adjustment member 3a3. Specifically, the upper layer surface material 5b has an overlapping portion 5b 1 arranged to overlap the joists 4c and the floor support member 4d (the lower layer surface material 5a), and a protruding portion 5b2 extending from the overlapping portion 5b 1 into the opening Al and covering the upper surface 3a3a of the height adjustment member 3a3. The overlapping portion 5bl has a portion overlapping the opening edge portion 4d2 of the floor support member 4d and a portion overlapping the opening outer portion 4d3. Note that, as illustrated in FIG. 3, a vertical interval corresponding to a thickness dimension of the protruding portion 5b2 of the upper layer surface material 5b is formed between the lower protruding portion 3c2 of the window frame 3cl and the upper surface 3a3a of the height adjustment member 3a3. Therefore, by inserting an outdoor-side edge portion of the protruding portion 5b2 of the upper layer surface material 5b under the lower protruding portion 3c2 of the window frame 3cl, the outdoor-side edge portion of the protruding portion 5b2 of the upper layer surface material 5b can be covered with the lower protruding portion 3c2. In other words, in order to cover the outdoor-side edge portion of the upper layer surface material 5b from above, the sweep-out window 3c has the lower protruding portion 3c2 (an example of the covering portion) attached to the lower crosspiece 3a2 in a state where the vertical interval corresponding to the thickness dimension of the upper layer surface material 5b is formed between the lower protruding portion 3c2 and the upper surface 3a3a of the height adjustment member 3a3.

[0027] With reference to FIG. 1, the airtight member 7 is for forming an airtight line continuous from the outer wall portion 3 to the foundation 2 via the floor support member 4d. Specifically, the airtight member 7 has a first airtight member 7a extending from a portion of the outer wall portion 3 deviated from the opening Al to the foundation 2, a second airtight member 7b extending from a range between the portion of the outer wall portion 3 deviated from the opening Al and the portion in the opening Al to the foundation 2, and a third airtight member 7c extending from the portion of the outer wall portion 3 in the opening Al 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 the airtight members adjacent to each other are coupled by an airtight tape (not illustrated). Note that 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, and an ethylene vinyl acetate (EVA) sheet).

[0028] As illustrated in FIG. 1, the first airtight member 7a includes a first support surface arrangement portion 7al, a first wall inner surface arrangement portion 7a2, a first member inner 6 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 7al is arranged on the support surface 4dl along the support surface 4dl of the floor support member 4d. The first wall inner surface arrangement portion 7a2 extends upward from an outdoor-side edge portion of the first support surface arrangement portion 7al and is arranged along the lateral inner surface 3alb of the column 3al and the surface of the inner heat insulating material 3a4 facing the indoor side. The first member inner surface arrangement portion 7a3 extends downward from an indoor-side edge portion of the first support surface arrangement portion 7al and is arranged along a surface of the floor support member 4d facing the indoor side. The first member lower surface arrangement portion 7a4 extends to the outdoor side from a lower edge portion of the first member inner surface arrangement portion 7a3 and is arranged along a lower surface of the floor support member 4d. The first foundation arrangement portion 7a5 extends downward from an outdoor-side edge portion of the first member lower surface arrangement portion 7a4 and is arranged along the inner surface of the foundation 2 (the rising portion 2b).

[0029] FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, and illustrates the airtight structure 1 cut along a plane between the side protruding portion 3c3 of the window frame 3c 1 and the column 3al. FIG. 4 is a perspective view illustrating an airtight member exploded in the airtight structure of FIG. 1. FIG. 5 is a perspective view illustrating the second airtight member 7b in an enlarged manner.

[0030] With reference to FIGS. 2, 4, and 5, the second airtight member 7b includes 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 fitting 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 an indoor-side edge portion 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 from a lower edge portion of the second lower inner surface arrangement portion 7bb toward the indoor side and is arranged along the support surface 4dl of the floor support member 4d. The second member inner surface arrangement portion 7bd extends downward from an indoor-side edge portion of the second support surface arrangement portion 7bc and is arranged along the surface of the floor support member 4d facing the indoor side. The second member lower surface arrangement portion 7be extends to the outdoor side from a lower edge portion 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 an outdoor-side edge portion of the second member lower surface arrangement portion 7be and is arranged along the inner surface of the foundation 2 (the rising portion 2b). The second fitting arrangement portion 7bg extends upward from an outdoor-side edge portion of the second horizontal arrangement portion 7ba and is arranged along a surface of the window frame 3cl of the sweep-out window 3c facing the indoor side (a surface facing the indoor side in an area opposite to the opening Al of the side protruding 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 a foundation connection portion extending downward from the indoorside edge portion of the second support surface arrangement portion 7bc and connected to a surface of the foundation 2 facing the indoor side.

[0031] Furthermore, the second airtight member 7b has a second vertical arrangement portion 7bh and a second lateral inner surface arrangement portion 7bi. The second vertical arrangement portion 7bh extends upward from an edge portion close to the vertical surface 3ala of the column 3al in the second horizontal arrangement portion 7ba and is arranged along the vertical surface 3ala, and is connected to the second fitting arrangement portion 7bg. The second lateral inner surface arrangement portion 7bi extends in the horizontal direction from an indoor-side edge portion of the second vertical arrangement portion 7bh and is arranged along the lateral inner surface 3alb of the column 3al and the surface of the inner heat insulating material 3a4 facing the indoor side.

[0032] The second lower inner surface arrangement portion 7bb has a lower inner surface main body portion 7bbl connected to the second horizontal arrangement portion 7ba, and a lower inner surface extension portion 7bb2 extending in the horizontal direction from the lower inner surface main body portion 7bbl and connected to the second lateral inner surface arrangement portion 7bi.

[0033] The second support surface arrangement portion 7bc has a support surface main body portion 7bcl connected to the lower inner surface main body portion 7bbl, and a support surface extension portion 7bc2 extending in the horizontal direction from the support surface main body portion 7bcl and connected to the lower inner surface extension portion 7bb2.

[0034] The second member inner surface arrangement portion 7bd has a member inner surface main body portion 7bdl connected to the support surface main body portion 7bcl, and a member inner surface extension portion 7bd2 extending in the horizontal direction from the member inner surface main body portion 7bdl and connected to the support surface extension portion 7bc2.

[0035] The second member lower surface arrangement portion 7be has a member lower surface main body portion 7bel connected to the member inner surface main body portion 7bdl, and a member lower surface extension portion 7be2 extending in the horizontal direction from the member lower surface main body portion 7bel and connected to the member inner surface extension portion 7bd2.

[0036] The second foundation arrangement portion 7bf has a foundation main body 7bfl connected to the member lower surface main body portion 7bel, and a foundation extension portion 7bf2 extending in the horizontal direction from the foundation main body 7bf 1 and connected to the member lower surface extension portion 7be2. 8

[0037] FIG. 3 is a cross-sectional view taken along line Ill-Ill in FIG. 1, and illustrates a state in which the airtight structure 1 is cut along a plane passing through the lower protruding portion 3c2 of the window frame 3c 1.

[0038] With reference to FIGS. 3 and 4, the third airtight member 7c includes 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 fitting 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 an indoor-side edge portion 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 from a lower edge portion of the third lower inner surface arrangement portion 7cb toward the indoor side and is arranged along the support surface 4dl of the floor support member 4d. The third member inner surface arrangement portion 7cd extends downward from an indoor-side edge portion of the third support surface arrangement portion 7cc and is arranged along the surface of the floor support member 4d facing the indoor side. The third member lower surface arrangement portion 7ce extends to the outdoor side from a lower edge portion 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 an outdoor-side edge portion of the third member lower surface arrangement portion 7ce and is arranged along the inner surface of the foundation 2 (the rising portion 2b). The third fitting arrangement portion 7cg extends upward from an outdoor-side edge portion of the third horizontal arrangement portion 7ca and is arranged along the surface of the window frame 3c 1 of the sweep-out window 3c facing the indoor side (the surface facing the indoor side under the lower protruding portion 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 a foundation connection portion extending downward from the indoor-side edge portion of the third support surface arrangement portion 7cc and connected to the surface of the foundation 2 facing the indoor side.

[0039] FIG. 6 is a perspective view of the third airtight member 7c in an exploded manner. As illustrated in FIGS. 4 and 6, the third airtight member 7c in the present 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 the third fitting arrangement portion 7cg. The second piece 7cB has a portion corresponding to a part of the third horizontal arrangement portion 7ca, and the third lower inner surface arrangement portion 7cb. The third piece 7cC has the third lower inner surface arrangement portion 7cb, the third support surface arrangement portion 7cc, the third member inner surface arrangement portion 9 7cd, the third member lower surface arrangement portion 7ce, and the third foundation arrangement portion 7cf. The first piece 7cA and the second piece 7cB are joined to each other in a state where portions 7cAl and 7cBl corresponding to a part of the third horizontal arrangement portion 7ca are overlapped with each other. The second piece 7cB and the third piece 7cC are joined to each other in a state where the third lower inner surface arrangement portions 7cb thereof overlap each other.

[0040] Although in the present embodiment, the third airtight member 7c is formed by joining the first piece 7cA, the second piece 7cB, and the third piece 7cC to each other, the third airtight member 7c may be formed of a single member. On the other hand, although in the present embodiment, the first airtight member 7a and the second airtight member 7b are formed of a single member, these airtight members 7a and 7b may be formed by joining a plurality of pieces. By preparing the second airtight member 7b and the third airtight member 7c having the abovedescribed configuration as one member in advance, construction work of the airtight structure 1 can be simplified using the second airtight member 7b and the third airtight member 7c.

[0041] Hereinafter, a procedure for constructing the airtight structure 1 using the airtight members 7a to 7c will be described.

[0042] First, the structure illustrated in FIGS. 4 and 7 is prepared. Specifically, in this structure, the foundation 2 is provided with only the outer heat insulating material 6c of the foundation heat insulating material 6, 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 underfloor base material 4 is attached to the lower crosspiece 3a2.

[0043] Next, as illustrated in FIG. 1, the first airtight member 7a is attached to an area deviated from the opening in the configuration illustrated in FIG. 4. Specifically, the first support surface arrangement portion 7al is arranged along the support surface 4dl, the first wall inner surface arrangement portion 7a2 is arranged along the lateral inner surface 3alb of the column 3al and the surface of the inner heat insulating material 3a4 facing the indoor side, and the first member inner surface arrangement portion 7a3 is arranged along the surface of the floor support member 4d facing the indoor side. Furthermore, 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 of the foundation 2 (the rising portion 2b) facing the indoor side. An adhesive layer is provided on the whole or a part of a surface of the first airtight member 7a opposed to 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 over the area deviated from the opening and an area in the opening in the configuration illustrated in FIG. 4. Specifically, as illustrated 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 10 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 4d 1. Furthermore, the second member inner surface arrangement portion 7bd is arranged along the surface of the floor support member 4d facing the indoor side, 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 of the foundation 2 (the rising portion 2b) facing the indoor side. In addition, the second fitting arrangement portion 7bg is arranged along the surface of the window frame 3c 1 facing the indoor side, the second vertical arrangement portion 7bh is arranged along the vertical surface 3ala of the column 3al, and the second lateral inner surface arrangement portion 7bi is arranged along the lateral inner surface 3alb of the column 3al. An adhesive layer is provided on the whole or a part of a surface of the second airtight member 7b opposed to the foundation 2, the outer wall portion 3, the floor support member 4d, and the window frame 3cl, 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 3cl 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 in the opening in the configuration illustrated in FIG. 4. Specifically, as illustrated in FIGS. 4 and 8, the third horizontal arrangement portion 7ca is arranged along the upper surface 3a3a of the height adjustment member 3a3, the third member inner surface 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 4dl. Furthermore, the third member inner surface arrangement portion 7cd is arranged along the surface of the floor support member 4d facing the indoor side, the third member 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 surface of the foundation 2 (the rising portion 2b) facing the indoor side. In addition, the third fitting arrangement portion 7cg is arranged along the surface of the window frame 3cl facing the indoor side. An adhesive layer is provided on the whole or a part of a surface of the third airtight member 7c opposed to the foundation 2, the outer wall portion 3, the floor support member 4d, and the window frame 3c 1, 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 3c 1 via the adhesive layer. The adhesive layer may be provided by a double-sided tape or may be formed by an adhesive.

[0046] Next, as illustrated in FIG. 9, the inner heat insulating material 6b and the soft heat insulating material 6d are provided on the foundation 2, the struts 4a are erected on the base portion 2a of the foundation 2, and the sleepers 4b are installed on the struts 4a. Furthermore, the joists are provided on the sleepers 4b, and the floor heat insulating material 4e is provided on the soft heat insulating material 6d.

[0047] Furthermore, as illustrated in FIG. 10, the lower layer surface material 5a is installed on the support surface 4d 1 (the first support surface arrangement portion 7a 1, the second support surface arrangement portion 7bc, and the third support surface arrangement portion 7cc) of the floor support member 4d. Specifically, the lower layer surface material 5a is installed so as to be fitted in a step portion formed by the height adjustment member 3a3 and the floor support member 4d. Furthermore, the upper layer surface material 5b is installed on the lower layer surface material 5a so as to cover the lower layer surface material 5a and the upper surface 3a3a (the second horizontal arrangement portion 7ba and the third horizontal arrangement portion 7ca) of the height adjustment member 3a3. At this time, the upper layer surface material 5b is installed such that the outdoor-side edge portion of the upper layer surface material 5b is inserted between the lower protruding portion 3c2 of the window frame 3cl and the upper surface 3a3a of the height adjustment member 3a3. As a result, the airtight structure 1 as illustrated in FIGS. 2 and 3 can be constructed.

[0048] As described above, since in the airtight structure 1, the support surface 4dl is arranged below the upper surface 3a3a (the lower horizontal surface) of the height adjustment member 3a3 at a portion where the floor support member 4d and the floor surface material 5 are engaged with each other, the step is formed for fitting the floor surface material 5 between the opening forming member (the pair of columns 3al, the lower crosspiece 3a2, the height adjustment member 3a3, and the upper crosspiece (not illustrated)) and the floor support member 4d. 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 a path extending over the upper surface 3a3a, a surface of the opening forming member facing the indoor side (the lower inner surface 3a3b of the height adjustment member 3a3), and the support surface 4d 1. In the present invention, since the second airtight member 7b and the third airtight member 7c have shapes that can be arranged along the path of the airtight line, it is possible to simplify construction work of the airtight members 7b and 7c for forming an airtight line at the portion where the floor support member 4d and the floor surface material 5 are engaged with each other.

[0049] According to the above configuration, since the second airtight member 7b and the third airtight member 7c have the second fitting arrangement portion 7bg and the third fitting arrangement portion 7cg, it is possible to easily form an airtight line continuous from the sweep-out window 3c to the floor support member 4d.

[0050] According to the above configuration, since a dimension of the lower inner surface 3a3b in the vertical direction is set to a dimension corresponding to the thickness dimension of the lower layer surface material 5a, the upper surface of the lower layer surface material 5a and the upper surface 3a3a (the horizontal arrangement portions 7ba, 7ca) can be arranged on the same plane by arranging the lower layer surface material 5a on the support surface 4d 1. A floor surface can be finished with the airtight members 7b and 7c covered by laminating the upper layer surface material 5b on the lower layer surface material 5a and the upper surface 3a3a.

[0051] According to the above configuration, the airtight members 7b and 7c can be covered by arranging the upper layer surface material 5b, and furthermore, an edge portion of the upper layer surface material 5b can be accommodated in the sweep-out window 3c by covering the outdoor-side edge portion of the upper layer surface material 5b with the lower protruding portion (an example of the covering portion) 3c2.

[0052] According to the above configuration, since in the opening forming member, the lower inner surface 3a3b, the surface of the column 3al facing the indoor side, and a surface of the inner heat insulating material 3a4 facing the inside are arranged on the same plane, a shape of the lower layer surface material 5a can be simplified by making an outdoor-side edge portion of the lower layer surface material 5a straight. As a result, the lower layer surface material 5a and the floor surface material provided at a position except for the sweep-out window 3c in the building can be shared.

[0053] According to the above configuration, since the airtight members 7b and 7c have the foundation connection portion (the second member inner surface arrangement portion 7bd, the second member lower surface arrangement portion 7be, and the second foundation arrangement portion 7bf, and the third member inner surface arrangement portion 7cd, the third member lower surface arrangement portion 7ce, and the third foundation arrangement portion 7cf, respectively), it is possible to easily form a continuous airtight line from the sweep-out window 3 c to the foundation 2.

[0054] According to the above configuration, since the second airtight member 7b has the second vertical arrangement portion 7bh, the second lateral inner surface arrangement portion 7bi, the lower inner surface extension portion 7bb2, and the support surface extension portion 7bc2, the second airtight member 7b can be easily arranged over the opening Al and an area deviated from the opening Al in the horizontal direction.

[0055] Note that the above-described specific embodiment mainly includes the invention having the following configurations.

[0056] An airtight structure of a building according to one aspect of the present invention includes: an opening forming member that forms an opening surrounded by a pair of horizontal surfaces opposed to each other in a vertical direction and a pair of vertical surfaces opposed to each other in a horizontal direction; a floor support member having a support surface for supporting a floor surface material, the floor support member being attached to the opening forming member such that the support surface is arranged below a lower horizontal surface located below out of the pair of horizontal surfaces; and an airtight member having: a horizontal arrangement portion to be arranged along the lower horizontal surface; a lower inner surface arrangement portion extending downward from an indoor-side edge portion of the horizontal arrangement portion, and being to be arranged along a lower inner surface facing an indoor side, the lower inner surface extending downward from an indoor-side edge portion of the lower horizontal surface in the opening forming member ; and a support surface arrangement portion extending from a lower edge portion of the lower inner surface arrangement portion toward the indoor side and being to be arranged along the support surface.

[0057] Since in the airtight structure, the support surface is arranged below the lower horizontal 13 surface at a portion where the floor support member and the floor surface material are engaged with each other, the step is formed for fitting the floor surface material between the opening forming member and the floor support member. In this configuration, in order to form an airtight state from the opening forming member to the floor support member, it is necessary to form an airtight line along a path extending over the lower horizontal surface, the surface of the opening forming member facing the indoor side, and the support surface. In the airtight structure, since the airtight member has a shape that can be arranged along the path of the airtight line, it is possible to simplify construction work of the airtight member for forming the airtight line at the portion where the floor support member and the floor surface material are engaged with each other.

[0058] Preferably, the airtight structure further includes a fitting attached to the opening forming member from an outdoor side to be fitted into the opening, and the airtight member has a fitting arrangement portion extending upward from an outdoor-side edge portion of the horizontal arrangement portion and being to be arranged along a surface of the fitting facing the indoor side.

[0059] According to the airtight structure, since the airtight member has the fitting arrangement portion, a continuous airtight line from the fitting to the floor support member can be easily formed.

[0060] Preferably, in the airtight structure of a building, the floor surface material has: a lower layer surface material to be placed on the support surface; and an upper layer surface material to be provided on the lower layer surface material to cover the lower layer surface material and the lower horizontal surface, and a vertical height dimension of a lower inner surface of the opening forming member is set to a dimension corresponding to a thickness dimension of the lower layer-surface material.

[0061] According to the airtight structure, since the dimension of the lower inner surface in the vertical direction is set to the dimension corresponding to the thickness dimension of the lower-layer surface material, an upper surface of the lower layer surface material and the lower-horizontal surface (the horizontal arrangement portion of the airtight member) can be arranged on the same plane by arranging the lower layer surface material on the support surface. A floor surface can be finished with the airtight member covered by laminating the upper layer surface material on the lower layer surface material and the lower horizontal surface.

[0062] Preferably, in the airtight structure, the fitting has a covering portion attached to the opening forming member in a state where an interval in the vertical direction corresponding to a thickness dimension of the upper layer surface material is formed between the covering portion and the lower horizontal surface in order to cover an outdoor-side edge portion of the upper layer surface material from above.

[0063] According to the airtight structure, the airtight member can be covered by arranging the upper layer surface material, and the edge portion of the upper layer surface material can be accommodated in the fitting by covering the outdoor-side edge portion of the upper layer surface 14 material with the covering portion.

[0064] Preferably, in the airtight structure of a building, a lower inner surface of the opening forming member is arranged on the same plane as a lateral inner surface of the opening forming member, the lateral inner surface extending in the horizontal direction from the lower inner surface beyond one vertical surface and facing the indoor side.

[0065] According to the airtight structure, since in the opening forming member, the lower inner surface and the lateral inner surface are arranged on the same plane, a shape of the lower layer floor surface material can be simplified by making an outdoor-side edge portion of the lower layer floor surface material straight. As a result, the lower layer surface material and the floor surface material provided at a position except for the fitting in the building can be shared.

[0066] Preferably, the airtight structure of a building further includes a foundation on which the opening forming member is placed and which supports the opening forming member, and the airtight member has a foundation connection portion extending downward from an indoor-side edge portion of the support surface arrangement portion and being to be connected to a surface of the foundation facing the indoor side.

[0067] According to the airtight structure, since the airtight member has the foundation connection portion, it is possible to easily form a continuous airtight line from the fitting to the foundation.

[0068] Preferably, in the airtight structure of a building, the airtight member has: a vertical arrangement portion that extends upward from an edge portion close to one vertical surface of the pair of vertical surfaces in the horizontal arrangement portion and is to be arranged along the one vertical surface; and a lateral inner surface arrangement portion that extends in the horizontal direction from an indoor-side edge portion of the vertical arrangement portion and is to be arranged along a lateral inner surface extending in the horizontal direction from the lower inner surface of the opening forming member beyond the one vertical surface and facing the indoor side, the lower inner surface arrangement portion has: a lower inner surface main body portion connected to the horizontal arrangement portion; and a lower inner surface extension portion extending in the horizontal direction from the lower inner surface main body portion and connected to the lateral inner surface arrangement portion, and the support surface arrangement portion has: the support surface main body portion connected to the lower inner surface arrangement portion; and a support surface extension portion extending in the horizontal direction from the support surface main body portion and connected to the lower inner surface extension portion.

[0069] According to the airtight structure, since the airtight member has the vertical arrangement portion, the lateral inner surface arrangement portion, the lower inner surface extension portion, and the support surface extension portion, the airtight member can be easily arranged over the opening and an area deviated from the opening in the horizontal direction.

Claims

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

2. The airtight structure of a building according to claim 1, further comprising a fitting attached to the opening forming member from an outdoor side to be fitted into the opening, whereinthe airtight member has a fitting arrangement portion extending upward from an outdoor-side edge portion of the horizontal arrangement portion and being to be arranged along a surface of the fitting facing the indoor side.

3. The airtight structure of a building according to claim 2, whereinthe floor surface material has: a lower layer surface material to be placed on the support surface; and an upper layer surface material to be provided on the lower layer surface material to cover the lower layer surface material and the lower horizontal surface, anda vertical height dimension of a lower inner surface of the opening forming member is set to a dimension corresponding to a thickness dimension of the lower layer surface material.

4. The airtight structure of a building according to claim 3, wherein the fitting has a covering portion attached to the opening forming member in a state where an interval in the vertical direction corresponding to a thickness dimension of the upper layer surface material is formed between the covering portion and the lower horizontal surface in order to cover an outdoor-side edge portion of the upper layer surface material from above.

5. The airtight structure of a building according to claim 3 or 4, wherein a lowerinner surface of the opening forming member is arranged on the same plane as a lateral inner surface of the opening forming member, the lateral inner surface extending in the horizontal direction from the lower inner surface beyond one vertical surface and facing the indoor side.

6. The airtight structure of 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, whereinthe airtight member has a foundation connection portion extending downward from an indoor-side edge portion of the support surface arrangement portion and being to be connected to a surface of the foundation facing the indoor side.

7. The airtight structure of a building according to any one of claims 1 to 6, whereinthe airtight member has: a vertical arrangement portion that extends upward from an edge portion close to one vertical surface of the pair of vertical surfaces in the horizontal arrangement portion and is to be arranged along the one vertical surface; and a lateral inner surface arrangement portion that extends in the horizontal direction from an indoor-side edge portion of the vertical arrangement portion and is to be arranged along a lateral inner surface extending in the horizontal direction from the lower inner surface of the opening forming member beyond the one vertical surface and facing the indoor side,the lower inner surface arrangement portion has: a lower inner surface main body portion connected to the horizontal arrangement portion; and a lower inner surface extension portion extending in the horizontal direction from the lower inner surface main body portion and connected to the lateral inner surface arrangement portion, andthe support surface arrangement portion has: the support surface main body portion connected to the lower inner surface arrangement portion; and a support surface extension portion extending in the horizontal direction from the support surface main body portion and connected to the lower inner surface extension portion.

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