building

Abstract

To provide a building capable of improving heat insulation by reducing gaps generated between members sandwiching an airtight sheet. [Solution] The device comprises a member to be coated (2a, 3b, 8a), an airtight sheet 7b, and a fitted member 9 that sandwiches a portion of the airtight sheet 7b, wherein the airtight sheet 7b has a shrink film S2 sandwiched between the surface to be coated of the member to be coated and the sandwiching surface of the fitted member 9, and a moisture-proof film S1 that is positioned away from the sandwiching surface and has a standard thickness dimension set based on a predetermined airtight performance, and at least a portion of the shrink film S2 forms a thin portion that has a thickness dimension smaller than the standard thickness dimension.

Description

[Technical Field]

[0001] The present disclosure relates to a building having an airtight sheet covering a surface to be covered of a covering member. [Background technology]

[0002] Known examples of airtight buildings include buildings equipped with airtight sheets, such as those described in Patent Document 1. Specifically, in the building described in Patent Document 1, airtight sheets are attached to predetermined locations, including between the rising portion of the insulated foundation and the floor panels, and between the floor panels and the interior wall panels. The airtight sheets have a relatively thick thickness that allows the entire structure to achieve the desired airtightness performance. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-90988 Summary of the Invention [Problem to be solved by the invention]

[0004] In the building of Patent Document 1, gaps were generated between the areas where the airtight sheets were sandwiched, which sometimes reduced the heat insulation properties.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide a building that can improve insulation by reducing the gaps that occur between the members that sandwich the airtight sheet. [Means for solving the problem]

[0006] The inventors of the present invention conducted extensive experiments on gaps that occur between the components that hold the airtight sheet, and discovered that the stiffness of the airtight sheet causes wrinkles and lifting in the airtight sheet at the areas where the airtight sheet is held, such as between the rising part of the insulated foundation and the floor panel, and between the floor panel and the interior wall panel, which makes it easy for gaps like those described above to form.

[0007] A building according to a first aspect for solving the above problem comprises a coating target component having a coating target surface, an airtight sheet that covers the coating target surface and has airtightness, and a clamping member having a clamping surface that clamps a portion of the airtight sheet between the coating target surface, wherein the airtight sheet has a clamped portion clamped between the coating target surface and the clamping surface, and an airtight main body portion that is positioned away from the clamping surface and has a standard thickness dimension set based on a predetermined airtight performance, and at least a portion of the clamped portion forms a thin-walled portion having a thickness dimension smaller than the standard thickness dimension.

[0008] If the entire airtight sheet has a standard thickness, wrinkles or lifting may form in the clamped portion sandwiched between the object to be coated and the clamping member, creating a gap between the object to be coated and the clamping member, potentially reducing the thermal insulation performance. In contrast, in the first aspect, at least a portion of the clamped portion of the airtight sheet sandwiched between the object to be coated and the covering member is made of a thin portion having a thickness smaller than the standard thickness. This reduces the bulk of the airtight sheet sandwiched between the object to be coated and the clamping member, thereby preventing the formation of a gap at least in part between the object to be coated and the clamping member. As a result, even if a gap does form, the thin portion prevents air from passing through the gap, thereby preventing a decrease in the thermal insulation performance of the building.

[0009] The building according to the second aspect preferably further comprises the following feature in addition to the building according to the first aspect: That is, in the building according to the second aspect, the surface to be coated has a plurality of adjacent surfaces that face in different directions and are adjacent to each other, the clamping surface has a plurality of opposing surfaces that respectively face the plurality of adjacent surfaces, and the clamped portion is provided in the airtight sheet in a range that spans the plurality of adjacent surfaces.

[0010] When a folded portion is formed by a plurality of adjacent surfaces, wrinkles and lifting tend to occur in the airtight sheet disposed at the folded portion. In contrast, according to the second aspect, by disposing a clamped portion having a thin portion at the folded portion, wrinkles and lifting are suppressed in the area where the thin portion of the folded portion is disposed. As a result, wrinkles and lifting can be suppressed in the folded portion and the airtight sheet disposed below the folded portion.

[0011] The building according to the third aspect is the building according to the second aspect, and desirably further comprises the following feature: That is, in the building according to the third aspect, a recess is formed in the component to be coated by a plurality of adjacent surfaces, the clamping member fits into the recess, and the clamped portion is clamped between the component to be coated and the clamping member.

[0012] According to the third aspect, the airtight sheet that is clamped between the member to be coated and the clamping member in the recess is prone to wrinkles and lifting, but by arranging a clamped portion having a thin portion in the recess, it is possible to prevent wrinkles and lifting from forming in the airtight sheet that is placed in the recess.

[0013] A building according to a fourth aspect is preferably a building according to any one of the first to third aspects, further comprising the following feature: That is, in a building according to the fourth aspect, the component to be covered has a foundation, a standing member extending upward from the upper surface of the foundation, and a heat insulating material extending above the upper surface of the foundation on the indoor side of the foundation, the foundation, the standing member, and the heat insulating material form a recess that opens upward, the clamping member fits into the recess from above, and the building further has a floor material supported on the upper surface of the clamping member.

[0014] According to the fourth aspect, since the floor material is supported by the clamping member provided on the airtight sheet, it is possible to prevent the airtight state of the airtight sheet from being destroyed by the floor material. For example, it is possible to prevent the airtight sheet from being damaged by a screw driven into the floor material.

[0015] The building according to the fifth aspect is the building according to any one of the first to fourth aspects, and preferably further comprises the following feature: That is, in the building according to the fifth aspect, the thin-walled portion has heat shrinkability.

[0016] According to the fifth aspect, by heating the thin-walled portion during construction, the volume of the thin-walled portion can be reduced, and wrinkles and lifting formed in the thin-walled portion can be further reduced. [Effects of the Invention]

[0017] According to the present disclosure, it is possible to provide a building that can improve thermal insulation by reducing the gaps that occur between the members that sandwich the airtight sheet. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a side cross-sectional view of a building according to a first embodiment of the present disclosure. [Figure 2] 2 is a side cross-sectional view showing the building shown in FIG. 1 cut at a position where the support structures for the under-beam insulation, ceiling substrate, and interior wall substrate appear. FIG. [Figure 3] FIG. 2 is a plan view showing an airtight member used in the building of FIG. 1. [Figure 4] FIG. 4 is a front view of the airtight member shown in FIG. [Figure 5] FIG. 4 is a side view of the airtight member shown in FIG. [Figure 6] This shows two airtight components arranged side by side. [Figure 7] 2 is an enlarged cross-sectional view showing the periphery of a portion where a recess is formed in FIG. 1. FIG. [Figure 8] FIG. 10 is an enlarged cross-sectional view of a portion of a building according to a second embodiment of the present disclosure. [Figure 9] FIG. 4 is a front view of an airtight sheet according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0019] [First embodiment] A building according to a first embodiment of the present disclosure will be described with reference to the drawings. Note that the following embodiment embodies the present disclosure and is not intended to limit the technical scope of the present disclosure.

[0020] Fig. 1 is a side cross-sectional view of a building 1 according to a first embodiment of the present disclosure. Fig. 2 is a side cross-sectional view showing the building 1 shown in Fig. 1 cut at a position where the support structures for the under-beam insulation material, ceiling substrate, and interior wall substrate appear.

[0021] Referring to Figures 1 and 2, the building 1 of the first embodiment comprises a structural body 2, an exterior wall 3 supported by the structural body 2, an interior wall subfloor 4, an attachment mechanism 5 for attaching the interior wall subfloor 4 to the inside of the exterior wall 3, a floor subfloor material 6 that forms the floor of the upper floor (the second floor in this embodiment), and a plurality of airtight members 7 (see Figure 6) that form an airtight layer from the floor subfloor material 6 along the exterior wall 3.

[0022] The structural body 2 has a foundation 2a, a perimeter beam 2b extending horizontally along the perimeter of the building 1, and a first inner beam 2c (extending parallel to the perimeter beam 2b: see Figure 1) and a second inner beam 2d (extending perpendicular to the perimeter beam 2b: see Figure 2) extending from the perimeter beam 2b to the inside of the perimeter beam 2b.

[0023] The foundation 2a has a horizontal portion 2a1 that extends horizontally along the site of the building 1, and a support portion 2a2 that rises from the peripheral edge of the horizontal portion 2a1 along the periphery of the building 1. The support portion 2a2 is used to support the outer periphery beams 2b via columns not shown in the figure.

[0024] The perimeter beam 2b is supported on the support portion 2a2 by columns (not shown) provided on the upper surface of the support portion 2a2. Specifically, the perimeter beam 2b is made of H-shaped steel having a pair of flanges 2b1 and a web 2b2 connecting the centers of the flanges 2b1. The perimeter beam 2b is supported by the columns (not shown) with both flanges 2b1 aligned horizontally. A soft insulating material (e.g., insulating material made of glass wool) 2b3 is provided between the flanges 2b1 of the perimeter beam 2b.

[0025] The first inner beam 2c, like the outer perimeter beam 2b, is made of an H-shaped steel having a pair of flanges 2c1 and a web 2c2 connecting the centers of the flanges 2c1. As shown in Fig. 2, the second inner beam 2d, like the first inner beam 2c, is also made of an H-shaped steel having a pair of flanges 2d1 (only one is shown in Fig. 2) and a web 2d2 connecting the centers of the flanges 2d1.

[0026] The exterior wall 3 comprises an exterior wall panel 3a, under-beam insulation 3b provided inside the exterior wall panel 3a, and soft insulation 3c provided between the exterior wall panel 3a and the under-beam insulation 3b.

[0027] The exterior wall panel 3a is attached to a support portion 2a2 of the foundation 2a and a flange 2b1 of the outer perimeter beam 2b via mounting brackets 3a1 and 3a2.

[0028] The under-beam insulation 3b is provided below the perimeter beam 2b, specifically between the perimeter beam 2b and the foundation 2a. Specifically, the under-beam insulation 3b is sandwiched between the underside of the flange 2b1 of the perimeter beam 2b and the support portion 2a2 of the foundation 2a, and is positioned horizontally relative to the flange 2b1 by a positioning member 3b1 (see Figure 2) or the like. The positioning member 3b1 is inserted into a recess 3b2 formed on the upper surface of the under-beam insulation 3b through a hole 2b1a that penetrates the flange 2b1 vertically. This positioning member 3b1 positions the under-beam insulation 3b as follows: First, the inner surface 3b3 of the under-beam insulation 3b facing the room is positioned outside the inner surface 2a2b of the support portion 2a2 facing the room, so that the upper surface 2a2a remains inside the under-beam insulation 3b on the upper surface of the support portion 2a2 of the foundation 2a. In addition, the inner surface 3b3 of the under-beam insulation material 3b is positioned inside the end surface of the flange 2b1 on the indoor side so that the mounting surface 3b4 remains inside the flange 2b1 on the upper surface of the under-beam insulation material 3b. The under-beam insulation material 3b is a hard insulation material made of foamed urethane or the like.

[0029] The flexible heat insulating material 3c is provided between the upper surface of the support portion 2a2 of the foundation 2a and the flange 2b1 of the outer perimeter beam 2b. The flexible heat insulating material 3c is attached to the outer perimeter beam 2b at a distance from the outer wall panel 3a to form a ventilation passage between the flexible heat insulating material 3c and the outer wall panel 3a. The flexible heat insulating material 3c is made of, for example, glass wool.

[0030] The interior wall base 4 has an internal space for wiring and the like. Specifically, the interior wall base 4 has a plurality of studs 4a (only one is shown in the figures) extending vertically and arranged at intervals in the horizontal direction (depth direction in the paper of FIGS. 1 and 2), and a plurality of interior wall surface materials 4b (only one is shown in the figures) attached to the inner surfaces of the studs 4a facing the interior and arranged horizontally (same as above). In this way, an internal space is formed between adjacent studs 4a and outside the interior wall surface materials 4b.

[0031] The mounting mechanism 5 is for mounting the interior wall base 4 to the inside of the exterior wall 3. Specifically, the mounting mechanism 5 has a ceiling base 5a that supports the upper end of the interior wall base 4, a floor base 5b that supports the lower end of the interior wall base 4, an upper connecting member 5c for connecting the ceiling base 5a and the upper end of the interior wall base 4, and a lower connecting member 5d for connecting the floor base 5b and the lower end of the interior wall base 4.

[0032] As shown in Figure 2, the ceiling substructure 5a has a plurality of hanging devices 5a1 (only one is shown in Figure 2) attached to the flange 2d1 of the second inner beam 2d, a plurality of siding supports 5a2 (only one is shown in Figure 2) suspended from the second inner beam 2d by the hanging devices 5a1, a plurality of sidings 5a3 (only one is shown in Figure 2) attached to the underside of the siding support 5a2, and a ceiling surface material 5a4 attached to the underside of the sidings 5a3.

[0033] Each joist support 5a2 extends parallel to the second inner joist 2d below the second inner joist 2d. Each joist 5a3 extends perpendicular to the joist support 5a2 on the horizontal plane. The ceiling surface material 5a4 is fixed to the joists 5a3 with screws (not shown) while being in close contact with the underside of the joists 5a3. The edge of the ceiling surface material 5a4 adjacent to the perimeter joist 2b is in close contact with an area other than the area 5a3a, leaving the area 5a3a adjacent to the perimeter joist 2b on the underside of the joists 5a3 open.

[0034] An upper connecting member 5c is attached to the area 5a3a of the rough siding 5a3. The upper connecting member 5c forms a groove that opens downward and extends along the perimeter beam 2b to receive the upper ends of the studs 4a of the interior wall base 4 described above. Specifically, the upper connecting member 5c has a bottom portion 5c1 attached to the area 5a3a of the rough siding 5a3, an inner portion 5c2 extending downward from the inner edge of the bottom portion 5c1, and an outer portion 5c3 extending downward from the outer edge of the bottom portion 5c1. The upper ends of multiple studs 4a are inserted between the inner portion 5c2 and the outer portion 5c3 of the upper connecting member 5c.

[0035] Referring to Figure 1, the floor substructure 5b comprises a plurality of beams 5b1 (only one is shown in Figure 1) erected on the horizontal portion 2a1 of the foundation 2a, a plurality of joists 5b2 (only one is shown in Figure 1) provided on the beams 5b1 and extending horizontally, joists 5b3 provided on the joists 5b2 and extending in a direction perpendicular to the joists 5b2, and a floor surface material 5b4 provided on the joists 5b3.

[0036] A lower connecting member 5d is attached to an area 5b4a on the upper surface of the floor panel 5b4 adjacent to the perimeter beam 2b. The lower connecting member 5d forms a groove that opens upward and extends along the perimeter beam 2b to receive the lower ends of the studs 4a of the interior wall base 4 described above. Specifically, the lower connecting member 5d has a bottom portion 5d1 attached to the area 5b4a of the floor panel 5b4, an inner portion 5d2 extending upward from the inner edge of the bottom portion 5d1, and an outer portion 5d3 extending upward from the outer edge of the bottom portion 5d1. The lower ends of multiple studs 4a are inserted between the inner portion 5d2 and the outer portion 5d3 of the lower connecting member 5d.

[0037] In this way, the inner wall base 4 is attached to the inside of the outer wall 3 by inserting the upper and lower ends of the stud 4a into the upper connecting member 5c and the lower connecting member 5d shown in FIGS.

[0038] The underfloor material 6 is placed on the perimeter beams 2b and supported by them. The underfloor material 6 includes a floor surface material placed on the perimeter beams 2b and inner beams 2c and 2d. In this embodiment, the floor surface material is made of lightweight aerated concrete such as ALC.

[0039] The airtight member 7 includes a beam crossing heat material 7a provided on the indoor side of the outer periphery beam 2b, and an airtight sheet 7b fixed to the beam crossing heat material 7a.

[0040] Fig. 3 is a plan view showing the airtight member 7 used in the building 1 of Fig. 1. Fig. 4 is a front view of the airtight member 7 shown in Fig. 3. Fig. 5 is a side view of the airtight member 7 shown in Fig. 3. Fig. 6 is a view showing a state in which a plurality of airtight members 7 (two airtight members 7 are illustrated in Fig. 6) are arranged adjacent to each other.

[0041] 3 to 6, the beam crossing thermal material 7a is a rigid thermal insulation material made of urethane foam, etc. The beam crossing thermal material 7a has an upper surface 7a1 facing the lower surface 6a (see FIG. 1) of the underfloor material 6, an inner surface 7a2 perpendicular to the upper surface 7a1 and facing the indoor side, an outer surface 7a3 facing the opposite side to the inner surface 7a2, and a side surface 7a4 perpendicular to the upper surface 7a1 and the inner surface 7a2.

[0042] The airtight sheet 7b has a clamped portion 7b1 sandwiched between the underside 6a of the floor underlayment 6 and the upper surface 7a1 of the beam crossing thermal material 7a, an extending portion 7b2 extending from the clamped portion 7b1 beyond the edge of the upper surface 7a1 of the beam crossing thermal material 7a adjacent to the interior of the room, and a fixed portion 7b3 extending from the clamped portion 7b1 in the opposite direction to the extending portion 7b2 and fixed to the outer surface of the beam crossing thermal material 7a facing the outside of the room. Before application to the building 1, the airtight sheet 7b is fixed to the beam crossing thermal material 7a only at the fixed portion 7b3, and the clamped portion 7b1 and the extending portion 7b2 are released from the beam crossing thermal material 7a so as to be displaceable relative to the beam crossing thermal material 7a.

[0043] In this embodiment, the airtight sheet 7b has been described as having a fixed portion 7b3 arranged along the outer surface 7a3 of the beam-crossing heating material 7a, but the airtight sheet 7b only needs to have at least a clamped portion 7b1 and an extending portion 7b2. In this case, the airtight sheet 7b only needs to be fixed to the beam-crossing heating material 7a by at least one of the clamped portion 7b1 and the extending portion 7b2. In addition, in this embodiment, the clamped portion 7b1 covering the entire upper surface 7a1 of the beam-crossing heating material 7a has been described, but the clamped portion 7b1 only needs to cover at least a portion of the upper surface 7a1 of the beam-crossing heating material 7a.

[0044] The extension portion 7b2 has a covering portion 7b2a having a width dimension capable of covering the entire inner surface 7a2 in a width direction (left-right direction in FIGS. 3 and 4) perpendicular to a plane perpendicular to the upper surface 7a1 and the side surface 7a4 of the beam crossing thermal material 7a, and an excess portion 7b2b extending from the covering portion 7b2a to one side in the width direction (rightward in FIGS. 3 and 4). Therefore, as shown in FIG. 6, by arranging multiple airtight members 7 in the width direction so that the covering portion 7b2a of one airtight member 7 overlaps the excess portion 7b2b of another airtight member 7 from the indoor side, the inner surface of the inner wall surface material 4b can be covered with multiple airtight sheets 7b across the entire width direction.

[0045] 1, the extension 7b2 has a length in the vertical direction that is sufficient to cover the entire vertical surface of the inner surface 7a2 of the beam-crossing thermal insulation material 7a and the entire vertical surface of the inner surface 3b3 of the under-beam thermal insulation material 3b. This prevents humid indoor air from entering the beam-crossing thermal insulation material 7a and the under-beam thermal insulation material 3b when the indoor temperature is higher than the outdoor temperature, such as in winter. This prevents condensation from forming on the thermal insulation materials 3b and 7a when the beam-crossing thermal insulation material 7a and the under-beam thermal insulation material 3b are cooled by outside air.

[0046] Furthermore, the extension 7b2 also prevents condensation from occurring in the foundation heat insulating material 8 provided on the foundation 2a.

[0047] First, we will explain the foundation insulation 8 installed in the foundation 2a. The building 1 further has a foundation insulation 8 installed on the indoor side of the support portion 2a2 of the foundation 2a. The foundation insulation 8 has an inner foundation insulation 8a installed along the inner surface 2a2b of the support portion 2a2, a lower insulation 8b installed inside the inner foundation insulation 8a along the horizontal portion 2a1, and an upper insulation 8c installed on the lower insulation 8b inside the inner foundation insulation 8a.

[0048] The foundation insulation 8a is fixed to the horizontal portion 2a1 while being in close contact with the inner surface 2a2b of the support portion 2a2 and the upper surface of the horizontal portion 2a1. The foundation insulation 8a has a contact portion 8a1 that is in close contact with the inner surface 2a2b of the support portion 2a2, and an extension portion 8a2 that extends from the contact portion 8a1 to a position above the upper surface 2a2a of the support portion 2a2. The provision of the extension portion 8a2 forms a recess RE1 that opens upward and extends horizontally (toward the depth of the paper in FIG. 1) between the support portion 2a2 (foundation 2a), the under-beam insulation 3b, and the foundation insulation 8a.

[0049] The building 1 has a mating member 9 that fits into the recess RE1. The mating member 9 fits into the recess RE1 so that a portion of the extension portion 7b2 is sandwiched between the mating member 9 and the inner surface of the recess RE1. This fitting causes the extension portion 7b2 to be clamped under tension so as to be in close contact with the inner surface 7a2 of the beam crossing thermal insulation 7a, the inner surface 3b3 of the under-beam thermal insulation 3b, and the inner surface of the recess RE1. Furthermore, the extension portion 7b2 is disposed along the inner surface 8a5 (see FIG. 7) of the foundation thermal insulation 8a and is attached to the foundation 2a while connected to the upper surface of the horizontal portion 2a1. Specifically, the extension portion 7b2 has a vertical length that allows it to be connected to the horizontal portion 2a1, and the lower thermal insulation 8b and the upper thermal insulation 8c are fixed to the foundation 2a with the portion of the extension portion 7b2 that is disposed along the inner surface 8a5 of the foundation thermal insulation 8a being clamped. In this way, since the extension portion 7b2 is connected to the upper surface of the horizontal portion 2a1 of the foundation 2a, it is possible to prevent humid indoor air from entering the foundation insulation material 8a, and it is possible to prevent condensation from occurring in the foundation insulation material 8a when the foundation insulation material 8a is cooled by outside air. The fitted member 9 is an example of a clamping member of the present disclosure.

[0050] Interpolation insulation 10 is arranged to fill the space formed between the floor joist 5b3 and the fitted member 9. Buffer material 11 is also arranged to fill the gaps between the interpolation insulation 10 and the foundation insulation 8a and the upper insulation 8c. A floor material 5b4 is also arranged on the upper surface 9a of the fitted member 9, the upper surface of the interpolation insulation 10, and the upper surface of the floor joist 5b3. That is, the floor material 5b4 is supported by the upper surface 9a of the fitted member 9, the upper surface of the interpolation insulation 10, and the upper surface of the floor joist 5b3. In relation to this, because the floor material 5b4 does not come into direct contact with the airtight sheet 7b, damage to the airtight sheet 7b by screws or the like used to secure the floor material 5b4 is suppressed.

[0051] However, if multiple folds are formed in the recess RE1, the airtight sheet 7b is likely to wrinkle or lift when it is applied along the inner surface of the recess RE1 during construction. This lifting occurs when the airtight sheet 7b deviates from the surface it is covering. If the airtight sheet 7b wrinkles or lifts within the recess RE1, wrinkles and lifting are likely to occur not only in the recess RE1 but also in the airtight sheet 7b covering the portion below the recess RE1. Specifically, wrinkles and lifting are likely to occur in the airtight sheet 7b covering the upper surface 8a4 (see Figure 7) of the foundation insulation material 8a and the inner surface 8a5 (see Figure 7) of the foundation insulation material 8a. This causes the airtight sheet 7b, which is sandwiched between the foundation insulation material 8a and the upper insulation material 8c and the lower insulation material 8b, to fit poorly, making it more likely for gaps to form between the foundation insulation material 8a and the upper insulation material 8c and the lower insulation material 8b. When the gap is formed, indoor air enters the gap, and the thermal insulation of the building 1 decreases.

[0052] To solve the above-mentioned problems, in this embodiment, as shown in FIG. 4, the airtight sheet 7b is composed of two parts: a moisture-proof film S1 and a shrink film S2. The moisture-proof film S1 and the shrink film S2 are connected to each other via a tape member TP. As shown in FIG. 1, the moisture-proof film S1 is arranged along the inner surface 7a2 of the beam-crossing thermal insulation material 7a and the inner surface 3b3 of the beam-underside thermal insulation material 3b. Meanwhile, the shrink film S2 is arranged between the recessed portion RE1 and the mating member 9, and between the foundation-interior thermal insulation material 8a and the upper thermal insulation material 8c and the lower thermal insulation material 8b. The parts of the airtight sheet 7b that are clamped between the recessed portion RE1 and the mating member 9, and between the foundation-interior thermal insulation material 8a and the upper thermal insulation material 8c and the lower thermal insulation material 8b, are examples of clamped parts of the present disclosure.

[0053] The shrink film S2 has heat-shrinkability, meaning that it shrinks when heated. Specifically, the shrink film S2 is made of a heat-shrinkable material such as polyethylene, polypropylene, polyethylene terephthalate, or vinyl chloride. The moisture-proof film S1 may be made of the same material as the shrink film S2, or a different material. The moisture-proof film S1 may have a thickness of, for example, about 200 μm, and the shrink film S2 may have a thickness of, for example, about 60 μm. In this way, when the thickness dimension of the moisture-proof film S1 is taken as the reference thickness dimension, the shrink film S2 has a thickness dimension smaller than the reference thickness dimension. The portion of the airtight sheet 7b made of the shrink film S2 is an example of a thin-walled portion of the present disclosure.

[0054] The standard thickness dimension is a value that ensures a predetermined airtightness. The airtightness is a value that provides the desired comfort that people inside the building 1 will find comfortable. Therefore, a moisture-proof film S1 having the standard thickness dimension can achieve higher airtightness than a shrink film S2. The portion of the airtight sheet 7b made of the moisture-proof film S1, i.e., the portion covering the inner surface 3b3 of the under-beam insulation 3b, is an example of an airtight main body portion of the present disclosure.

[0055] Fig. 7 is an enlarged cross-sectional view enlarging the periphery of the portion where the recess RE1 is formed in Fig. 1. Note that Fig. 7 shows a schematic view of the structure around the recess RE1, and the scale etc. does not necessarily match that of the cross-sectional view of Fig. 1.

[0056] As shown in FIG. 7, recess RE1 is formed by foundation 2a, under-beam insulation 3b, and in-foundation insulation 8a. Under-beam insulation 3b extends upward from upper surface 2a2a of foundation 2a. In-foundation insulation 8a abuts against inner surface 2a2b of foundation 2a on the indoor side of foundation 2a and extends above upper surface 2a2a of foundation 2a. This forms recess RE1 that opens upward and is surrounded by upper surface 2a2a of foundation 2a, inner surface 3b3 of under-beam insulation 3b, and outer surface 8a3 of in-foundation insulation 8a. Foundation 2a, under-beam insulation 3b, and in-foundation insulation 8a are examples of components to be covered in the present disclosure, and upper surface 2a2a of foundation 2a, inner surface 3b3 of under-beam insulation 3b, and outer surface 8a3 of in-foundation insulation 8a are examples of surfaces to be covered in the present disclosure.

[0057] Hereinafter, the surface of the upper surface 2a2a that forms the recessed portion RE1 is defined as the first adjacent surface fc1. The first adjacent surface fc1 is a surface that is covered with the airtight sheet 7b during construction and that sandwiches the airtight sheet 7b together with the fitted member 9. The surface of the inner surface 3b3 that forms the recessed portion RE1 is defined as the second adjacent surface fc2. The second adjacent surface fc2 is a surface that is covered with the airtight sheet 7b during construction and that sandwiches the airtight sheet 7b together with the fitted member 9. The surface of the outer surface 8a3 that forms the recessed portion RE1 is defined as the third adjacent surface fc3. The third adjacent surface fc3 is a surface that is covered with the airtight sheet 7b during construction and that sandwiches the airtight sheet 7b together with the fitted member 9. The first adjacent surface fc1 to the third adjacent surface fc3 are examples of the adjacent multiple adjacent surfaces of the present disclosure.

[0058] The first adjacent surface fc1 and the second adjacent surface fc2 are adjacent to each other and face in different directions. Specifically, the first adjacent surface fc1 and the second adjacent surface fc2 are arranged perpendicular to each other. Furthermore, the first adjacent surface fc1 and the third adjacent surface fc3 are adjacent to each other and face in different directions. Specifically, the first adjacent surface fc1 and the third adjacent surface fc3 are arranged perpendicular to each other. The recess RE1 is formed by the first adjacent surface fc1 to the third adjacent surface fc3, with the first adjacent surface fc1 forming the bottom surface of the recess RE1 and the inner surface 3b3 and the outer surface 8a3 forming the opposing surfaces of the recess RE1.

[0059] The fitted member 9 is fitted into the recess RE1 from above with the airtight sheet 7b arranged across the first adjacent surface fc1, second adjacent surface fc2, and third adjacent surface fc3 that form the recess RE1. At this time, the airtight sheet 7b is clamped and pressed between the first adjacent surface fc1 to third adjacent surface fc3 that form the recess RE1 and a clamping surface fs that is a surface of the fitted member 9 that fits into the recess RE1.

[0060] The clamping surface fs has multiple opposing surfaces (first opposing surface fs1 to third opposing surface fs3). The first opposing surface fs1 faces the first adjacent surface fc1. The second opposing surface fs2 faces the second adjacent surface fc2. The third opposing surface fs3 faces the third adjacent surface fc3. The first opposing surface fs1 to third opposing surface fs3 are an example of multiple opposing surfaces of the present disclosure.

[0061] 7, the recess RE1 is covered with a shrink film S2 indicated by the dashed line. That is, the shrink film S2 is disposed between the first adjacent surface fc1 and the first opposing surface fs1, between the second adjacent surface fc2 and the second opposing surface fs2, and between the third adjacent surface fc3 and the third opposing surface fs3. Meanwhile, the area above the recess RE1, i.e., the area of ​​the inner surface 3b3 of the under-beam insulation 3b excluding the second adjacent surface fc2, is covered with a moisture-proof film S1.

[0062] The vertical dimension L of the airtight sheet 7b shown in FIG. 4 is adjusted so that the recessed portion RE1 is covered with the shrink film S2. The dimension L need only be long enough to cover at least the recessed portion RE1 with the shrink film S2, and a portion above the recessed portion RE1 (the inner surface 3b3) may also be covered with the shrink film S2. Considering manufacturing costs, it is preferable to adjust the dimension L so that the shrink film S2 switches to the shrink film S2 just before the recessed portion RE1. This is because the shrink film S2 is more expensive than the moisture-proof film S1, and it is therefore desirable to minimize the amount of shrink film S2 used.

[0063] In this embodiment, the area below the recess RE1 is also covered with the shrink film S2. That is, the upper surface 8a4 of the foundation insulation material 8a and the inner surface 8a5 of the foundation insulation material 8a are covered with the shrink film S2. Furthermore, the shrink film S2 covering the inner surface 8a5 is sandwiched between the upper insulation material 8c and the lower insulation material 8b. In the above configuration, the inner surface 8a5 of the foundation insulation material 8a is an example of a surface to be covered in the present disclosure. The lower insulation material 8b and the upper insulation material 8c are examples of clamping members in the present disclosure. The outer surface 8b1 of the lower insulation material 8b and the outer surface 8c1 of the upper insulation material 8c are examples of clamping surfaces in the present disclosure.

[0064] [effect] The following describes the effects of covering the inner surface of the recessed portion RE1 with the shrink film S2. As described above, the shrink film S2 has a smaller thickness than the moisture-proof film S1. Therefore, when the shrink film S2 is applied along the inner surface of the recessed portion RE1, it can cover the inner surface up to the vicinity of the top (corner) of the recessed portion RE1, compared to when the moisture-proof film S1 is applied. Therefore, the shrink film S2 can be tightly fitted to the inner surface of the recessed portion RE1, which reduces wrinkling and lifting of the shrink film S2 compared to when the moisture-proof film S1 is applied. In relation to this, the shrink film S2 covering the area below the recessed portion RE1 (i.e., the upper surface 8a4 and inner surface 8a5 of the foundation insulation material 8a) also reduces wrinkling and lifting. As a result, the airtight sheet 7b sandwiched between the foundation insulation material 8a and the upper insulation material 8c and the lower insulation material 8b fits better, and the formation of gaps between the foundation insulation material 8a and the upper insulation material 8c is reduced. In connection with this, a decrease in the insulating performance due to indoor air entering the gap formed between the inside foundation insulating material 8a and the top insulating material 8c is suppressed.

[0065] Additionally, the areas where the airtight sheet 7b is not sandwiched, specifically the inner surface 3b3 of the under-beam insulation 3b, are covered with a moisture-proof film S1. The inner surface 3b3 of the under-beam insulation 3b faces the room and requires airtightness. By covering this area with the moisture-proof film S1, the airtightness of the room is increased, ensuring comfort inside. The shrink film S2 also has airtightness, but since most of it is sandwiched and its area in contact with the air is small, it does not matter if its airtightness is lower than that of the moisture-proof film S1.

[0066] Furthermore, since the shrink film S2 has heat shrinkability, when the recess RE1 is covered with the shrink film S2 during installation, heat can be applied to the shrink film S2 using a heat gun or the like to cause it to thermally shrink, thereby reducing the volume of the shrink film S2 and thereby further reducing the wrinkles and lifting that form in the shrink film S2.

[0067] [Second embodiment] A second embodiment of the present disclosure will be described below. The airtight sheet 7c used in the second embodiment has a different structure from the airtight sheet 7b of the first embodiment. The following description will focus on the structure that differs from the first embodiment. Note that parts that are common to the first embodiment described above will be given the same reference numerals and their description will be omitted.

[0068] FIG. 8 is an enlarged cross-sectional view of a part of the building 1 according to the second embodiment of the present disclosure, and corresponds to FIG. 7 in the first embodiment described above.

[0069] The second embodiment also has a recess RE1 as shown in Figure 8. The recess RE1 is surrounded by the upper surface 2a2a of the foundation 2a, the inner surface 3b3 of the under-beam insulation 3b, and the outer surface 8a3 of the in-foundation insulation 8a, and is open upward. The recess RE1 is formed by a first adjacent surface fc1 that forms the bottom surface, and second and third adjacent surfaces fc2 and fc3 that are adjacent to the first adjacent surface fc1 and are arranged perpendicular to the first adjacent surface fc1. The second adjacent surface fc2 and the third adjacent surface fc3 face each other.

[0070] The fitted member 9 is fitted into the recess RE1 from above in a state in which the airtight sheet 7c covers the inner walls (first adjacent surface fc1 to third adjacent surface fc3) of the recess RE1. As a result, the airtight sheet 7c is sandwiched between the recess RE1 and the fitted member 9.

[0071] In the second embodiment, the shrink film S2 is used only in the area of ​​the airtight sheet 7c that is sandwiched between the recess RE1 and the fitted member 9, and the moisture-proof film S1 is used in the other areas.

[0072] FIG. 9 is a front view of an airtight sheet 7c of the second embodiment. As shown in FIG. 9, an area of ​​the airtight sheet 7c formed by a shrink film S2 is sandwiched between two areas formed by a moisture-proof film S1. Here, the moisture-proof film S1 located at the top of the paper in FIG. 9 is the part that covers the inner surface 3b3 of the under-beam insulation material 3b in FIG. 1. Specifically, the vertical dimension L1 of the uppermost moisture-proof film S1 in the airtight sheet 7c is adjusted to a length such that its lower end is positioned just before the recessed portion RE1 when the airtight sheet 7c covers the airtight sheet 7b in FIG. 1 instead of the airtight sheet 7b. The vertical dimension L2 of the shrink film S2 is adjusted to a length such that the shrink film S2 covers the inner surface of the recessed portion RE1. The vertical dimension L3 of the moisture-proof film S1 located at the bottom of the airtight sheet 7c is adjusted to a length that allows the moisture-proof film S1 to cover the upper surface 8a4 and inner surface 8a5 of the foundation insulation material 8a from the exit of the recess RE1, and whose lower end reaches the upper surface of the horizontal portion 2a1.

[0073] As described above, even when the shrink film S2 is used only in the area where the recess RE1 is formed, the same effects as those of the first embodiment described above can be obtained. Specifically, by suppressing wrinkling and lifting of the shrink film S2 placed in the recess RE1, the moisture-proof film S1 covering the area below the recess RE1 is also suppressed from wrinkling and lifting. As a result, the moisture-proof film S1 sandwiched between the inner surface of the foundation insulation 8a and the outer surface 8c1 of the upper insulation 8c and the outer surface 8b1 of the lower insulation 8b fits better, and gaps can be suppressed from forming between the foundation insulation 8a and the upper insulation 8c.

[0074] Furthermore, since the shrink film S2 is more expensive than the moisture-proof film S1, by using the shrink film S2 only in the areas that cause wrinkles (recesses RE1), the increase in manufacturing costs due to the use of the shrink film S2 can be minimized.

[0075] In this way, the entire clamped portion (clamped portion) of the airtight sheet 7c does not necessarily have to be made of shrink film S2, and shrink film S2 may be used only in the recess RE1 (part of the clamped portion), which is a portion of the airtight sheet 7c where wrinkles and lifting are likely to occur.

[0076] As described above, the first and second embodiments have been described as examples of the technology disclosed in this application. However, the technology in this disclosure is not limited to these and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. It is also possible to combine the components described in the above multiple embodiments to create a new embodiment. Therefore, examples of modified embodiments are provided below.

[0077] [Variations] In the above embodiment, the thickness direction dimension of the moisture-proof film S1 is exemplified as approximately 200 μm, and the thickness direction dimension of the shrink film S2 is exemplified as approximately 60 μm, but the specific values ​​in this disclosure are merely examples and may be changed as appropriate depending on the materials of the moisture-proof film S1 and the shrink film S2, the structure of the building, etc.

[0078] In the above embodiment, the recess RE1 is formed by the first adjacent surface fc1 to the third adjacent surface fc3 that are arranged perpendicular to each other, but the present disclosure is not limited to the adjacent surfaces arranged perpendicular to each other. That is, the adjacent surfaces may be arranged at an angle other than perpendicular (90 degrees).

[0079] In the above embodiment, the recess RE1 is formed, and the fitted member 9 is fitted in a state where the airtight sheets 7b and 7c are covered on the inner surface of the recess RE1. However, the present disclosure does not necessarily require the recess RE1. For example, instead of the recess RE1, the building may have an L-shaped bent structure. That is, it is sufficient for the building to have a structure in which the airtight sheet needs to be bent or curved to deform the airtight sheet. In other words, it is sufficient for the building to have a structure in which the airtight sheet is prone to wrinkling or lifting. This makes the airtight sheet prone to wrinkling or lifting, and gaps are likely to occur in the areas where the airtight sheet is clamped. By arranging a clamped portion having a thin portion in such a location, wrinkling and lifting are suppressed, and the occurrence of the gaps is suppressed.

[0080] In the above embodiment, the shrink film S2 covers the outlet of the recess RE1, i.e., up to just before the upper surface 8a4 of the foundation insulation 8a, but the present disclosure is not limited thereto. For example, a portion or all of the area between the third adjacent surface fc3 and the third opposing surface fs3 in the recess RE1 may be covered with the moisture-proof film S1. Similarly, a portion or all of the area between the first adjacent surface fc1 and the first opposing surface fs1 in the recess RE1 may be covered with the moisture-proof film S1. That is, it is sufficient that at least a portion of the inner surface of the recess RE1, preferably at least the first opposing surface fs1, is covered with the shrink film S2. In this way, even if only a portion of the inner wall of the recess RE1 is covered with the shrink film S2, at least the area covered with the shrink film S2 is prevented from wrinkling or lifting, thereby preventing the formation of gaps. As a result, even if wrinkles or lifting occur in the area covered with the moisture-proof film S1, creating gaps, the passage of air is restricted in the area covered with the shrink film S2, thereby preventing a decline in the thermal insulation performance of the building 1.

[0081] (Effects, etc.) As described above, the building disclosed herein has the following features and provides the following effects.

[0082] (Technology 1) The building of the present disclosure comprises a coating target component having a surface to be coated, an airtight sheet that covers the surface to be coated and is airtight, and a clamping member having a clamping surface that clamps a portion of the airtight sheet between the surface to be coated, wherein the airtight sheet has a clamped portion clamped between the surface to be coated and the clamping surface, and an airtight main body portion that is positioned away from the clamping surface and has a standard thickness dimension set based on a predetermined airtight performance, and at least a portion of the clamped portion forms a thin-walled portion having a thickness dimension smaller than the standard thickness dimension.

[0083] According to the building of the above-mentioned Technology 1, at least a part of the sandwiched part of the airtight sheet sandwiched between the object to be covered and the covering member is composed of a thin part having a thickness dimension smaller than the standard thickness dimension, so that by reducing the bulk of the airtight sheet sandwiched between the object to be covered and the sandwiching member, it is possible to prevent the formation of a gap at least in a part between the object to be covered and the sandwiching member. As a result, even if a gap is formed, the thin part can prevent air from passing through the gap, so it is possible to prevent a decrease in the thermal insulation performance of the building.

[0084] (Technology 2) In the building of the above-mentioned Technology 1, the surface to be coated has a plurality of adjacent surfaces facing in different directions and adjacent to each other, the clamping surface has a plurality of opposing surfaces that respectively face the plurality of adjacent surfaces, and the clamped portion may be provided in the airtight sheet in a range spanning the plurality of adjacent surfaces.

[0085] When a folded portion is formed by a plurality of adjacent surfaces, wrinkles and lifting tend to occur in the airtight sheet disposed at the folded portion. In contrast, according to the building of the above-mentioned Technology 2, by disposing a clamped portion having a thin portion at the folded portion, wrinkles and lifting of the airtight sheet are suppressed in the area where the thin portion of the folded portion is disposed. As a result, wrinkles and lifting can be suppressed in the folded portion and in the airtight sheet disposed below the folded portion.

[0086] (Technology 3) In the building of the above-mentioned Technology 1 or Technology 2, a recess may be formed in the component to be coated by a plurality of adjacent surfaces adjacent to each other, the clamping member may fit into the recess, and the clamped portion may be clamped between the component to be coated and the clamping member.

[0087] According to the building of the above-mentioned Technology 3, the airtight sheet that is clamped between the covered object and the clamping member in the recess is prone to wrinkles and lifting, but by placing a clamped part having a thin part in the recess, it is possible to prevent wrinkles and lifting from forming in the airtight sheet placed in the recess.

[0088] (Technology 4) In a building according to any one of the above techniques 1 to 3, the component to be covered may have a foundation, a standing member extending upward from the top surface of the foundation, and an insulating material extending above the top surface of the foundation on the indoor side of the foundation, wherein the foundation, the standing member, and the insulating material form a recess that opens upward, the clamping member fits into the recess from above, and the building may further have a floor material supported on the top surface of the clamping member.

[0089] According to the building of the above-mentioned Technology 4, since the floor material is supported by the clamping member provided on the airtight sheet, it is possible to prevent the airtight state of the airtight sheet from being destroyed by the floor material. For example, it is possible to prevent the airtight sheet from being damaged by a screw driven into the floor material.

[0090] (Technology 5) In the building according to any one of the above-mentioned techniques 1 to 4, the thin-walled portion may have heat shrinkability.

[0091] According to the building of Technology 5, the volume of the thin-walled portion can be reduced by heating the thin-walled portion during construction, and wrinkles and lifting formed in the thin-walled portion can be further reduced. [Explanation of symbols]

[0092] 1: Buildings 2a: Foundation (covered components) 2a2a: Upper surface (surface to be covered, adjacent surface) 3b: Under-beam insulation (covered component) 3b3: Inner surface (surface to be covered, adjacent surface) 5b4: Floor material 7a: Beam cross-section heat insulating material (covered component) 7a2: Inner surface (surface to be coated) 7b: Airtight sheet 7c: Airtight sheet 8a: Foundation insulation (covered components, insulation) 8a3: Outer surface (surface to be covered, adjacent surface) 8a4: Top surface (surface to be coated) 8a5: Inner surface (surface to be coated) 8b: Lower insulation material (clamping member) 8b1: External surface (pinching surface) 8c: Upper insulation material (clamping member) 8c1: External surface (pinching surface) 9: Fitted member (clamped member) fc1: First adjacent surface (adjacent surface, surface to be covered) fc2: Second adjacent surface (adjacent surface, surface to be covered) fc3: Third adjacent surface (adjacent surface, surface to be covered) fs: Sandwiching surface fs1: First opposing surface (clamping surface, opposing surface) fs2: Second opposing surface (clamping surface, opposing surface) fs3: Third opposing surface (clamping surface, opposing surface) S1: Moisture-proof film (airtight body) S2: Shrink film (clamped part, thin part) RE1: Recess

Claims

1. A building, a coating target member having a coating target surface; An airtight sheet that covers the surface to be covered and has airtightness; a clamping member having a clamping surface that clamps a part of the airtight sheet between the clamping member and the surface to be covered, The airtight sheet has a clamped portion clamped between the surface to be covered and the clamping surface, and an airtight main body portion that is arranged at a position away from the clamping surface and has a reference thickness dimension set based on a predetermined airtight performance, A building, wherein at least a portion of the clamped portion constitutes a thin-walled portion having a thickness dimension smaller than the reference thickness dimension.

2. the surface to be coated has a plurality of adjacent surfaces facing in different directions and adjacent to each other, the clamping surface has a plurality of opposing surfaces that respectively face the plurality of adjacent surfaces, The building according to claim 1 , wherein the clamped portion is provided in the airtight sheet over a range spanning the plurality of adjacent surfaces.

3. a recess is formed in the coating target member by a plurality of adjacent surfaces, The clamping member is fitted into the recess, The building according to claim 2 , wherein the clamped portion is clamped between the object to be covered and the clamping member.

4. The covering target component has a foundation, a standing member extending upward from an upper surface of the foundation, and a heat insulating material extending above the upper surface of the foundation on the indoor side of the foundation, and a recess that opens upward is formed by the foundation, the standing member, and the heat insulating material, The clamping member is fitted into the recess from above, The building according to claim 1 , further comprising a flooring material supported on an upper surface of the clamping member.

5. The building according to claim 1 , wherein the thin-walled portion has heat shrinkability.

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