Building

Abstract

The present invention comprises members (2a, 3b, 8a) to be covered, an airtight sheet (7b), and a member (9) to be fitted that sandwiches a portion of the airtight sheet (7b). The airtight sheet (7b) includes: a shrink film (S2) that is sandwiched between surfaces (fc1, fc2, fc3) to be covered of the members (2a, 3b, 8a) to be covered and sandwiching surfaces (fs1, fs2, fs3) of the member (9) to be fitted; and a moisture-proof film (S1) that is disposed at a position separated from the sandwiching surfaces (fs1, fs2, fs3) and has a reference thickness dimension set on the basis of a preset airtightness. At least a portion of the shrink film (S2) constitutes a thin-walled part having a thickness dimension smaller than the reference thickness dimension.

Description

Building

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

[0002] As an airtight building, for example, a building equipped with an airtight sheet as described in Patent Document 1 is known. Specifically, in the building described in Patent Document 1, an airtight sheet is attached to a predetermined portion including between the rising portion of the heat-insulating foundation and the floor panel, and between the floor panel and the inner wall panel. The airtight sheet has a relatively thick thickness dimension such that the whole can satisfy a desired airtight performance.

[0003] In the building of Patent Document 1, a gap may occur between the portions sandwiching the airtight sheet, resulting in a decrease in heat insulation.

[0004] Japanese Patent Application Laid-Open No. 2018-90988

[0005] An object of the present disclosure is to provide a building capable of reducing a gap generated between members sandwiching an airtight sheet and improving heat insulation.

[0006] The inventors of the present invention conducted intensive experiments on the gap generated between the members sandwiching the airtight sheet. As a result, they newly found that wrinkles and bulges of the airtight sheet are formed at portions sandwiching the airtight sheet, such as between the rising portion of the heat-insulating foundation and the floor panel, and between the floor panel and the inner wall panel, due to the stiffness of the airtight sheet, etc., making it easy to form the above-mentioned gap.

[0007] A building according to an aspect of the present invention includes a covering target member having a surface to be covered, an airtight sheet that covers the surface to be covered and has airtightness, and a sandwiching member having a sandwiching surface that sandwiches a part of the airtight sheet between the surface to be covered and the sandwiching surface. The airtight sheet has a sandwiched portion sandwiched between the surface to be covered and the sandwiching surface, and an airtight main body portion disposed at a position deviated from the sandwiching surface and having a reference thickness dimension set based on a preset airtight performance. At least a part of the sandwiched portion constitutes a thin portion having a thickness dimension smaller than the reference thickness dimension.

[0008] If the entire airtight sheet has a standard thickness dimension, wrinkles or lifting may form in the clamped portion that is sandwiched between the object to be covered and the clamping member, potentially creating a gap between the object to be covered and the clamping member, thus reducing the thermal insulation performance. In contrast, in the building according to this disclosure, at least a portion of the clamped portion of the airtight sheet that is sandwiched between the object to be covered and the covering member is composed of a thin-walled portion with a thickness dimension smaller than the standard thickness dimension. By reducing the bulk of the airtight sheet sandwiched between the object to be covered and the clamping member, it is possible to suppress the formation of a gap in at least a portion between the object to be covered and the clamping member. As a result, even if a gap is formed, the thin-walled portion can suppress the passage of air through the gap, thus suppressing a decrease in the thermal insulation performance of the building.

[0009] Figure 1 is a side cross-sectional view of a building according to the first embodiment of this disclosure. Figure 2 is a side cross-sectional view showing the building shown in Figure 1 cut at the location where the support structure for the beam under-insulation, ceiling substrate, and interior wall substrate is visible. Figure 3 is a plan view showing the airtight member used in the building of Figure 1. Figure 4 is a front view of the airtight member shown in Figure 3. Figure 5 is a side view of the airtight member shown in Figure 3. Figure 6 shows two airtight components arranged side by side. Figure 7 is an enlarged cross-sectional view of the area around the recessed portion in Figure 1. Figure 8 is an enlarged cross-sectional view of a part of a building according to the second embodiment of this disclosure. Figure 9 is a front view of the airtight sheet of the second embodiment of this disclosure.

[0010] [First Embodiment] A building according to the first embodiment of this disclosure will be described with reference to the drawings. The following embodiments are concrete examples of this disclosure and do not limit the technical scope of this disclosure.

[0011] Figure 1 is a side cross-sectional view of a building 1 according to a first embodiment of the present disclosure. Figure 2 is a side cross-sectional view of the building 1 shown in Figure 1, showing the state when it is cut at a position where the support structure for the beam under-insulation, ceiling substrate, and interior wall substrate is revealed.

[0012] Referring to Figures 1 and 2, the building 1 according to the first embodiment comprises a structural frame 2, an exterior wall 3 supported by the structural frame 2, an interior wall base 4, an attachment mechanism 5 for attaching the interior wall base 4 to the inside of the exterior wall 3, a floor base material 6 that constitutes the floor of the upper floor (the second floor in this embodiment), and a plurality of airtight members 7 (see Figure 6) for forming an airtight layer along the exterior wall 3 from the floor base material 6.

[0013] The structural frame 2 includes a foundation 2a, an outer perimeter beam 2b extending horizontally along the outer perimeter of the building 1, and a first inner beam 2c (extending parallel to the outer perimeter beam 2b: see Figure 1) and a second inner beam 2d (extending perpendicular to the outer perimeter beam 2b: see Figure 2) extending inward from the outer perimeter beam 2b.

[0014] The foundation 2a has a horizontal section 2a1 that extends horizontally along the site of the building 1, and a support section 2a2 that rises from the periphery of the horizontal section 2a1 along the outer perimeter of the building 1. The support section 2a2 is for supporting the outer perimeter beam 2b via columns not shown in the figure.

[0015] The outer perimeter beam 2b is supported on the support portion 2a2 by a column (not shown) provided on the upper surface of the support portion 2a2. Specifically, the outer perimeter beam 2b is made of an H-shaped steel having a pair of flanges 2b1 and a web 2b2 connecting the central parts of both flanges 2b1. The outer perimeter beam 2b is also supported by the column (not shown) with both flanges 2b1 in a position aligned horizontally. A soft insulating material (for example, an insulating material made of glass wool) 2b3 is provided between the two flanges 2b1 of the outer perimeter beam 2b.

[0016] The first inner beam 2c, like the outer beam 2b, is made of an H-shaped steel having a pair of flanges 2c1 and a web 2c2 connecting the central parts of both flanges 2c1. As shown in Figure 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 Figure 2) and a web 2d2 connecting the central parts of the flanges 2d1.

[0017] The exterior wall 3 comprises an exterior wall panel 3a, a beam-under-insulation material 3b provided on the inside of the exterior wall panel 3a, and a flexible insulation material 3c provided between the exterior wall panel 3a and the beam-under-insulation material 3b.

[0018] The exterior wall panel 3a is attached to the support portion 2a2 of the foundation 2a and the flange 2b1 of the outer perimeter beam 2b via mounting brackets 3a1 and 3a2.

[0019] The under-beam insulation material 3b is installed below the outer perimeter beam 2b, more specifically, between the outer perimeter beam 2b and the foundation 2a. Specifically, the under-beam insulation material 3b is sandwiched between the lower surface of the flange 2b1 of the outer 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 material 3b through a hole 2b1a that penetrates the flange 2b1 vertically. With this positioning member 3b1, the under-beam insulation material 3b is positioned as follows: First, the inner surface 3b3 of the under-beam insulation material 3b facing the interior is positioned outside the inner surface 2a2b of the support portion 2a2 facing the interior, so that the upper surface 2a2a of the under-beam insulation material 3b remains inside the support portion 2a2 of the foundation 2a. Furthermore, the inner surface 3b3 of the beam-under-beam insulation material 3b is positioned inward from the interior end face of the flange 2b1, so that a mounting surface 3b4 remains on the upper surface of the beam-under-beam insulation material 3b inside the flange 2b1. The beam-under-beam insulation material 3b is a rigid insulation material made of foamed urethane or the like.

[0020] The flexible insulation 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. Furthermore, the flexible insulation material 3c is attached to the outer perimeter beam 2b at a distance from the outer wall panel 3a in order to form a ventilation passage between it and the outer wall panel 3a. The flexible insulation material 3c is made of, for example, glass wool.

[0021] The interior wall substrate 4 has an internal space for wiring and the like. Specifically, the interior wall substrate 4 has a plurality of studs 4a (only one shown in the figures) that extend vertically and are spaced apart horizontally (in the depth direction of the paper in Figures 1 and 2), and a plurality of interior wall surface materials 4b (only one shown in the figures) that are attached to the interior-facing inner surfaces of the plurality of studs 4a and are 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.

[0022] The mounting mechanism 5 is for attaching the interior wall base 4 to the inside of the exterior wall 3. Specifically, the mounting mechanism 5 includes 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.

[0023] As shown in Figure 2, the ceiling base 5a includes a plurality of hangers 5a1 (only one shown in Figure 2) attached to the flange 2d1 of the second inner beam 2d, a plurality of joist hangers 5a2 (only one shown in Figure 2) suspended from the second inner beam 2d by the hangers 5a1, a plurality of joists 5a3 (only one shown in Figure 2) attached to the lower surface of the joist hangers 5a2, and a ceiling surface material 5a4 attached to the lower surface of the joists 5a3.

[0024] Each joist support 5a2 extends parallel to the second inner beam 2d below the second inner beam 2d. Each joist 5a3 extends perpendicular to the joist support 5a2 in the horizontal plane. The ceiling panel 5a4 is fixed to the joists 5a3 by screws or the like (not shown) while being in close contact with the lower surfaces of the joists 5a3. Furthermore, the edge of the ceiling panel 5a4 adjacent to the outer perimeter beam 2b is in close contact with the area 5a3a on the lower surface of the joist 5a3, while leaving the area 5a3a adjacent to the outer perimeter beam 2b open.

[0025] An upper connecting member 5c is attached to the area 5a3a of the ceiling joist 5a3. The upper connecting member 5c opens downward and forms a groove that extends along the outer perimeter beam 2b in order to receive the upper ends of the studs 4a of the inner wall base 4 described above. Specifically, the upper connecting member 5c has a bottom portion 5c1 attached to the area 5a3a of the ceiling joist 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. Multiple upper ends of the studs 4a are inserted between the inner portion 5c2 and the outer portion 5c3 of the upper connecting member 5c.

[0026] Referring to Figure 1, the subfloor 5b comprises a plurality of posts 5b1 (only one is shown in Figure 1) erected on the horizontal portion 2a1 of the foundation 2a, a plurality of main beams 5b2 (only one is shown in Figure 1) provided on the posts 5b1 and extending in the horizontal direction, joists 5b3 provided on the main beams 5b2 and extending in a direction perpendicular to the main beams 5b2, and floor surface material 5b4 provided on the joists 5b3.

[0027] A lower connecting member 5d is attached to the region 5b4a adjacent to the outer perimeter beam 2b on the upper surface of the floor material 5b4. The lower connecting member 5d opens upward and forms a groove that extends along the outer perimeter beam 2b in order to receive the lower ends of the studs 4a of the inner wall base 4 described above. Specifically, the lower connecting member 5d has a bottom portion 5d1 attached to the region 5b4a of the floor material 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.

[0028] In this way, the upper and lower ends of the stud 4a are inserted into the upper connecting member 5c and the lower connecting member 5d shown in Figures 1 and 2, thereby attaching the inner wall base 4 to the inside of the outer wall 3.

[0029] The subfloor material 6 is supported by the outer perimeter beam 2b while being placed on the outer perimeter beam 2b. The subfloor material 6 includes floor surface material placed on the outer perimeter beam 2b and the inner beams 2c and 2d. In this embodiment, the floor surface material is made of, for example, lightweight cellular concrete such as ALC.

[0030] The airtight member 7 comprises a beam-transverse thermal material 7a provided on the interior side of the outer perimeter beam 2b, and an airtight sheet 7b fixed to the beam-transverse thermal material 7a.

[0031] Figure 3 is a plan view showing the airtight member 7 used in the building 1 shown in Figure 1. Figure 4 is a front view of the airtight member 7 shown in Figure 3. Figure 5 is a side view of the airtight member 7 shown in Figure 3. Figure 6 shows a state in which multiple airtight members 7 (two airtight members 7 are shown as an example in Figure 6) are arranged adjacent to each other.

[0032] Referring to Figures 3 to 6, the beam transverse thermal insulation material 7a is a rigid thermal insulation material made of foamed urethane or the like. The beam transverse thermal insulation material 7a has an upper surface 7a1 facing the lower surface 6a (see Figure 1) of the floor base material 6, an inner surface 7a2 perpendicular to the upper surface 7a1 and facing the interior side, an outer surface 7a3 facing the opposite side of the inner surface 7a2, and a side surface 7a4 perpendicular to the upper surface 7a1 and the inner surface 7a2.

[0033] The airtight sheet 7b has a clamped portion 7b1 sandwiched between the lower surface 6a of the floor base material 6 and the upper surface 7a1 of the beam transverse thermal material 7a, an extended portion 7b2 extending from the clamped portion 7b1 beyond the edge of the upper surface 7a1 of the beam transverse thermal material 7a adjacent to the interior, and a fixed portion 7b3 extending from the clamped portion 7b1 in the opposite direction to the extended portion 7b2 and fixed to the outer surface of the beam transverse thermal material 7a facing the exterior. Before application to the building 1, only the fixed portion 7b3 of the airtight sheet 7b is fixed to the beam transverse thermal material 7a, while the clamped portion 7b1 and the extended portion 7b2 are freed from the beam transverse thermal material 7a so that they can be displaced relative to the beam transverse thermal material 7a.

[0034] In this embodiment, an airtight sheet 7b having a fixed portion 7b3 provided along the outer surface 7a3 of the beam transverse heat material 7a has been described, but the airtight sheet 7b only needs to have at least a clamped portion 7b1 and an extended portion 7b2. In this case, the airtight sheet 7b only needs to be fixed to the beam transverse heat material 7a by at least one of the clamped portion 7b1 and the extended portion 7b2. Also, in this embodiment, a clamped portion 7b1 that covers the entire upper surface 7a1 of the beam transverse heat material 7a has been described, but the clamped portion 7b1 only needs to cover at least a part of the upper surface 7a1 of the beam transverse heat material 7a.

[0035] The extension portion 7b2 has a covering portion 7b2a having a width dimension that can cover the entire inner surface 7a2 in the width direction (left-right direction in Figures 3 and 4) perpendicular to the plane perpendicular to the upper surface 7a1 and side surface 7a4 of the beam transverse thermal material 7a, and an excess portion 7b2b extending from the covering portion 7b2a to one side in the width direction (to the right in Figures 3 and 4). Therefore, as shown in Figure 6, by arranging multiple airtight members 7 in the width direction such that the excess portion 7b2b of one airtight member 7 overlaps the covering portion 7b2a of one airtight member 7 from the indoor side, the inner surface of the inner wall surface material 4b can be covered over the entire width direction by multiple airtight sheets 7b.

[0036] Furthermore, as shown in Figure 1, the extension portion 7b2 has a vertical length that can cover the entire vertical surface 7a2 of the beam transverse thermal material 7a and the entire vertical surface 3b3 of the beam under-insulation material 3b. This prevents humid indoor air from entering the beam transverse thermal material 7a and beam under-insulation material 3b when the indoor temperature is higher than the outdoor temperature, such as in winter. Therefore, it is possible to prevent condensation from occurring on both insulation materials 3b and 7a when the beam transverse thermal material 7a and beam under-insulation material 3b are cooled by the outside air.

[0037] Furthermore, the extension portion 7b2 prevents condensation from occurring in the foundation insulation material 8 provided on the foundation 2a.

[0038] First, the foundation insulation material 8 provided on the foundation 2a will be described. The building 1 further includes foundation insulation material 8 provided on the interior side of the support portion 2a2 of the foundation 2a. The foundation insulation material 8 includes foundation internal insulation material 8a provided along the inner surface 2a2b of the support portion 2a2, lower insulation material 8b provided inside the foundation internal insulation material 8a along the horizontal portion 2a1, and upper insulation material 8c provided inside the foundation internal insulation material 8a on top of the lower insulation material 8b.

[0039] The foundation insulation material 8a is fixed on the horizontal portion 2a1 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 material 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. Due to the provision of the extension portion 8a2, a recess RE1 is formed between the support portion 2a2 (foundation 2a), the beam under insulation material 3b, and the foundation insulation material 8a, which opens upward and extends in the horizontal direction (depth direction of the paper in Figure 1).

[0040] The building 1 further includes a fitting member 9 that fits into the recess RE1. The fitting member 9 is fitted into the recess RE1 such that a portion of the extension 7b2 is sandwiched between it and the inner surface of the recess RE1. Through this fitting, the extension 7b2 is compressed under tension so as to be in close contact with the inner surface 7a2 of the beam transverse thermal insulation material 7a, the inner surface 3b3 of the beam lower insulation material 3b, and the inner surface of the recess RE1. Furthermore, the extension 7b2 is positioned along the inner surface 8a5 (see Figure 7) of the foundation internal insulation material 8a and attached to the foundation 2a in a state where it is connected to the upper surface of the horizontal section 2a1. Specifically, the extension 7b2 has a vertical length that allows it to be connected to the horizontal section 2a1. The lower insulation material 8b and the upper insulation material 8c are fixed to the foundation 2a in a state where the portion of the extension 7b2 positioned along the inner surface 8a5 of the foundation internal insulation material 8a is compressed between them. As described above, since the lower end of the extension portion 7b2 is connected to the upper surface of the horizontal portion 2a1 of the foundation 2a, it is possible to suppress the entry of humid indoor air into the foundation insulation material 8a, and to prevent condensation from occurring in the foundation insulation material 8a when the foundation insulation material 8a is cooled by the outside air. The fitted member 9 is an example of a clamping member of this disclosure.

[0041] Interpolating insulation material 10 is positioned to fill the space formed between the joist 5b3 and the fitted member 9. Additionally, buffer material 11 is positioned to fill the gap between the interpolating insulation material 10 and the foundation insulation material 8a and upper insulation material 8c. Furthermore, flooring material 5b4 is positioned on the upper surface 9a of the fitted member 9, the upper surface of the interpolating insulation material 10, and the upper surface of the joist 5b3. That is, the flooring material 5b4 is supported by the upper surface 9a of the fitted member 9, the upper surface of the interpolating insulation material 10, and the upper surface of the joist 5b3. In connection with this, since the flooring material 5b4 does not directly contact the airtight sheet 7b, damage to the airtight sheet 7b by screws or other fasteners fixing the flooring material 5b4 is suppressed.

[0042] Incidentally, when multiple folds are formed in the recess RE1, wrinkles and lifting are more likely to occur in the airtight sheet 7b when covering the airtight sheet 7b along the inner surface of the recess RE1 during construction. This lifting is a phenomenon in which the airtight sheet 7b separates from the surface it is covering. When wrinkles and lifting occur in the airtight sheet 7b within the recess RE1, wrinkles and lifting are more likely to occur not only in the recess RE1 but also in the airtight sheet 7b covering the area below the recess RE1. Specifically, wrinkles and lifting are more likely to occur in the airtight sheet 7b covering the upper surface 8a4 (see Figure 7) and the inner surface 8a5 (see Figure 7) of the foundation insulation material 8a. As a result, the airtight sheet 7b, which is sandwiched between the foundation insulation material 8a and the upper and lower insulation materials 8b, does not fit well, and gaps are more likely to form between the foundation insulation material 8a and the upper and lower insulation materials 8b. When the above-mentioned gap is formed, indoor air enters the gap, which reduces the thermal insulation performance of building 1.

[0043] In order to solve the above-described problems, in the present 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. The moisture-proof film S1 is arranged along the inner surface 7a2 of the beam cross heat insulating material 7a and the inner surface 3b3 of the beam lower heat insulating material 3b in the state shown in FIG. 1. On the other hand, the shrink film S2 is arranged between the concave portion RE1 and the fitting member 9, and between the foundation inner heat insulating material 8a, the upper heat insulating material 8c, and the lower heat insulating material 8b. Among the airtight sheet 7b, the portions sandwiched between the concave portion RE1 and the fitting member 9, and between the foundation inner heat insulating material 8a, the upper heat insulating material 8c, and the lower heat insulating material 8b are examples of the sandwiched portions of the present disclosure.

[0044] The shrink film S2 has heat shrinkability that causes it to shrink when heat is applied. Specifically, the shrink film S2 is composed of a material having heat shrinkability such as polyethylene, polypropylene, polyethylene terephthalate, vinyl chloride, etc. The moisture-proof film S1 may be composed of the same material as the shrink film S2 or a different material. The moisture-proof film S1 may have a thickness of about 200 μm, for example, and the shrink film S2 may have a thickness of about 60 μm, for example. Thus, the shrink film S2 has a thickness dimension smaller than the reference thickness dimension when the dimension in the thickness direction of the moisture-proof film S1 is taken as the reference thickness dimension. The portion of the airtight sheet 7b made of the shrink film S2 is an example of the thin portion of the present disclosure.

[0045] The above reference thickness dimension is set to a value that ensures a preset airtight performance. The above airtight performance is set to a value that provides the desired comfort that a person inside the building 1 feels comfortable. Therefore, the moisture-proof film S1 having the reference thickness dimension can obtain higher airtight performance than the shrink film S2. The portion of the airtight sheet 7b made of the moisture-proof film S1, that is, the portion covering the inner surface 3b3 of the beam lower heat insulating material 3b is an example of the airtight main body portion of the present disclosure.

[0046] FIG. 7 is an enlarged cross-sectional view of the periphery of the portion where the recess RE1 is formed in FIG. 1. Note that FIG. 7 shows the structure around the recess RE1 in a simulated manner, and the scale etc. does not necessarily match the cross-sectional view of FIG. 1.

[0047] As shown in FIG. 7, the recess RE1 is formed by the foundation 2a, the under-beam heat insulating material 3b, and the in-foundation heat insulating material 8a. The under-beam heat insulating material 3b extends upward from the upper surface 2a2a of the foundation 2a. The in-foundation heat insulating material 8a extends above the upper surface 2a2a of the foundation 2a while abutting on the inner surface 2a2b of the foundation 2a on the indoor side of the foundation 2a. Thereby, a recess RE1 that is surrounded by the upper surface 2a2a of the foundation 2a, the inner surface 3b3 of the under-beam heat insulating material 3b, and the outer surface 8a3 of the in-foundation heat insulating material 8a and opens upward is formed. The foundation 2a, the under-beam heat insulating material 3b, and the in-foundation heat insulating material 8a are an example of the members to be covered in the present disclosure, and the upper surface 2a2a of the foundation 2a, the inner surface 3b3 of the under-beam heat insulating material 3b, and the outer surface 8a3 of the in-foundation heat insulating material 8a are an example of the surfaces to be covered in the present disclosure.

[0048] Hereinafter, the surface of the upper surface 2a2a that forms the recess 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 sandwiches the airtight sheet 7b together with the fitting member 9. The surface of the inner surface 3b3 that forms the recess 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 sandwiches the airtight sheet 7b together with the fitting member 9. The surface of the outer surface 8a3 that forms the recess 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 sandwiches the airtight sheet 7b together with the fitting member 9. The first adjacent surface fc1 to the third adjacent surface fc3 are an example of a plurality of adjacent surfaces adjacent to each other in the present disclosure.

[0049] The first adjacent surface fc1 and the second adjacent surface fc2 are adjacent to each other but face different directions. Specifically, the first adjacent surface fc1 and the second adjacent surface fc2 are positioned perpendicular to each other. Also, the first adjacent surface fc1 and the third adjacent surface fc3 are adjacent to each other but face different directions. Specifically, the first adjacent surface fc1 and the third adjacent surface fc3 are positioned perpendicular to each other. The recess RE1 is formed by the first adjacent surfaces fc1 to the third adjacent surfaces fc3, the first adjacent surface fc1 forms the bottom surface of the recess RE1, and the inner surface 3b3 and the outer surface 8a3 form the mutually opposing surfaces of the recess RE1.

[0050] The fitted member 9 is fitted into the recess RE1 from above with the airtight sheet 7b positioned across the first adjacent surface fc1, the second adjacent surface fc2, and the third adjacent surface fc3 that form the recess RE1. At this time, the airtight sheet 7b is compressed between the first adjacent surface fc1 to the third adjacent surface fc3 that form the recess RE1 and the clamping surface fs of the fitted member 9 that fits into the recess RE1.

[0051] The clamping surface fs has a plurality of 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 surfaces fs1 to third opposing surfaces fs3 are examples of the plurality of opposing surfaces of this disclosure.

[0052] As shown in Figure 7, the recess RE1 is covered with a shrink film S2, indicated by the dashed line. Specifically, the shrink film S2 is placed 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. On the other hand, the portion above the recess RE1, i.e., the portion of the inner surface 3b3 of the under-beam insulation material 3b excluding the second adjacent surface fc2, is covered with a moisture-proof film S1.

[0053] The airtight sheet 7b has its vertical dimension L, as shown in Figure 4, adjusted so that the recess RE1 is covered with the shrink film S2. The dimension L should be long enough to cover at least the recess RE1 with the shrink film S2, and a portion above the recess RE1 (inner surface 3b3) may also be covered with the shrink film S2. Considering manufacturing costs, it is preferable that the dimension L is adjusted so that the shrink film S2 switches just before the recess RE1. This is because the shrink film S2 is more expensive than the moisture-proof film S1, and it is desirable to minimize the amount of shrink film S2 used.

[0054] Furthermore, in this embodiment, the portion below the recess RE1 is also covered with the shrink film S2. That is, the upper surface 8a4 and the inner surface 8a5 of the foundation insulation material 8a are covered with the shrink film S2. 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 the surface to be covered in this disclosure. The lower insulation material 8b and the upper insulation material 8c are examples of the sandwiching members in this 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 the sandwiching surfaces in this disclosure.

[0055] [Effects] The following describes the effects of covering the inner surface of the recess RE1 with the shrink film S2. As mentioned above, the shrink film S2 has a smaller thickness than the moisture-proof film S1. As a result, when the shrink film S2 is applied along the inner surface of the recess RE1, the shrink film S2 can be applied along the inner surface up to near the top (corner) of the recess RE1, compared to when the moisture-proof film S1 is applied. Therefore, the shrink film S2 can be made to be in close contact with the inner surface of the recess RE1, and wrinkles and lifting of the shrink film S2 are suppressed compared to the case of the moisture-proof film S1. Related to this, wrinkles and lifting are also suppressed in the shrink film S2 that covers the area below the recess RE1 (i.e., the upper surface 8a4 and inner surface 8a5 of the foundation insulation material 8a). As a result, the fit of the airtight sheet 7b sandwiched between the foundation insulation material 8a and the upper insulation material 8c and lower insulation material 8b is improved, and the formation of gaps between the foundation insulation material 8a and the upper insulation material 8c is suppressed. In connection with this, the deterioration of thermal insulation performance caused by indoor air entering the gap formed between the foundation insulation material 8a and the upper insulation material 8c is suppressed.

[0056] Furthermore, the inner surface 3b3 of the under-beam insulation material 3b is covered with a vapor barrier film S1 in areas where the airtight sheet 7b is not sandwiched. The inner surface 3b3 of the under-beam insulation material 3b faces the interior of the room and requires airtightness. By covering this area with the vapor barrier film S1, the airtightness of the room is increased, ensuring comfort inside the room. The shrink film S2 also has airtightness, but since most of the shrink film S2 is sandwiched and has a small surface area in contact with air, it is acceptable for its airtightness to be lower than that of the vapor barrier film S1.

[0057] Furthermore, since the shrink film S2 is heat-shrinkable, during installation, heat can be applied to the shrink film S2 with a heat gun or the like while it is covering the recess RE1 to cause it to shrink, thereby reducing the volume of the shrink film S2 and further reducing the wrinkles and lifting that form on the shrink film S2.

[0058] [Second Embodiment] The 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. Parts that are common to the first embodiment described above will be denoted by the same reference numerals and their descriptions will be omitted.

[0059] Figure 8 is an enlarged cross-sectional view of a part of the building 1 according to the second embodiment of this disclosure, and corresponds to Figure 7 in the first embodiment described above.

[0060] In the second embodiment as well, the recess RE1 shown in Figure 8 is formed. The recess RE1 is surrounded by the upper surface 2a2a of the foundation 2a, the inner surface 3b3 of the under-beam insulation material 3b, and the outer surface 8a3 of the foundation internal insulation material 8a, and opens upward. The recess RE1 is formed from a first adjacent surface fc1 that forms the bottom surface, a second adjacent surface fc2 that is adjacent to the first adjacent surface fc1 and positioned perpendicular to the first adjacent surface fc1, and a third adjacent surface fc3 that is adjacent to the first adjacent surface fc1 and positioned perpendicular to the first adjacent surface fc1. The second adjacent surface fc2 and the third adjacent surface fc3 face each other.

[0061] The fitted member 9 is fitted into the recess RE1 from above, with the airtight sheet 7c covering the inner wall of the recess RE1 (first adjacent surface fc1 to third adjacent surface fc3). As a result, the airtight sheet 7c is sandwiched between the recess RE1 and the fitted member 9.

[0062] In the second embodiment, the shrink film S2 is used only in the portion of the airtight sheet 7c that is sandwiched between the recess RE1 and the fitted member 9, while the moisture-proof film S1 is used in the other portions.

[0063] Figure 9 is a front view of the airtight sheet 7c of the second embodiment. As shown in Figure 9, the airtight sheet 7c has a region formed of shrink film S2 sandwiched between two regions formed of moisture-proof film S1. Here, the moisture-proof film S1 located on the upper side of the paper in Figure 9 is the part that covers the inner surface 3b3 of the under-beam insulation material 3b in Figure 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, when the airtight sheet 7c is covered in place of the airtight sheet 7b in Figure 1, its lower end is positioned directly in front of the recess RE1. 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 recess RE1. The vertical dimension L3 of the moisture-proof film S1, which is located at the bottom of the airtight sheet 7c in the vertical direction, is adjusted to a length such that the moisture-proof film S1 covers the upper surface 8a4 and inner surface 8a5 of the foundation insulation material 8a from the exit of the recess RE1, and its lower end reaches the upper surface of the horizontal section 2a1.

[0064] 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 in the first embodiment described above can be obtained. Specifically, by suppressing wrinkles and lifting of the shrink film S2 placed in the recess RE1, the occurrence of wrinkles and lifting of the moisture-proof film S1 covering the area below the recess RE1 is also suppressed. As a result, the fit of the moisture-proof film S1 sandwiched between the inner surface of the foundation insulation material 8a and the outer surface 8c1 of the upper insulation material 8c and the outer surface 8b1 of the lower insulation material 8b is improved, and the formation of a gap between the foundation insulation material 8a and the upper insulation material 8c can be suppressed.

[0065] Furthermore, since shrink film S2 is more expensive than moisture-proof film S1, the increase in manufacturing costs due to the use of shrink film S2 can be minimized by using it only in the areas that cause softening (recessed areas RE1).

[0066] Thus, the entire clamped portion (clamped portion) of the airtight sheet 7c does not necessarily need to be made of shrink film S2. The shrink film S2 may be used only in the recessed portion RE1 (part of the clamped portion), which is a part of the airtight sheet 7c where wrinkles and lifting are likely to occur.

[0067] As described above, the first and second embodiments have been presented as examples of the technology disclosed in this application. However, the technology in this disclosure is not limited thereto and can be applied to embodiments that have been modified, replaced, added, or omitted. Furthermore, it is possible to combine the components described in the above-mentioned embodiments to create new embodiments. Therefore, examples of modifications are given below.

[0068] [Modifications] In the above embodiment, the thickness dimension of the moisture-proof film S1 is exemplified as approximately 200 μm, and the thickness dimension of the shrink film S2 is exemplified as approximately 60 μm. However, the specific numerical values ​​in this disclosure are merely examples and may be appropriately changed depending on the materials of the moisture-proof film S1 and shrink film S2, the structure of the building, etc.

[0069] In the above embodiment, the recess RE1 was formed from first adjacent surfaces fc1 to third adjacent surfaces fc3 arranged perpendicular to each other, but this disclosure is not limited to adjacent surfaces arranged perpendicularly. That is, adjacent surfaces may be arranged at angles other than perpendicular (90 degrees).

[0070] In the above embodiment, a recess RE1 was formed, and the fitted member 9 was fitted with the inner surface of the recess RE1 covered with airtight sheets 7b and 7c. However, this disclosure does not necessarily require a recess RE1. For example, instead of a recess RE1, the building may have an L-shaped bent structure. That is, any building with a structure that requires bending or curving the airtight sheet to deform it is acceptable. In other words, any building with a structure that makes it easy for wrinkles or lifting to occur in the airtight sheet is acceptable. This makes it easier for wrinkles or lifting to occur in the airtight sheet, and gaps are more likely to occur in the parts that clamp the airtight sheet. By placing a clamped part with a thin wall portion in such a location, wrinkles and lifting are suppressed, and the occurrence of the gaps is suppressed.

[0071] In the second embodiment described above, the shrink film S2 covers up to the exit of the recess RE1, that is, just before the upper surface 8a4 of the foundation insulation material 8a, but the disclosure is not limited thereto. For example, some 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, some 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. In other words, 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 when a portion of the inner wall of the recess RE1 is covered with the shrink film S2, the formation of gaps is suppressed in the area covered with the shrink film S2 because wrinkles and lifting are suppressed. As a result, even if wrinkles or lifting occur in the area covered by the moisture-proof film S1, gaps may form, but the passage of air is suppressed in the area covered by the shrink film S2, thus preventing a decrease in the thermal insulation performance of the building 1.

[0072] (Effects, etc.) Based on the above, the building described herein has the following features and produces the following effects.

[0073] (Technical 1) The building of the present disclosure comprises a covering target member having a surface to be covered, an airtight sheet that covers the covering target surface and is airtight, and a clamping member having a clamping surface that clamps a part of the airtight sheet between itself and the covering target surface, wherein the airtight sheet has a clamped portion that is clamped between the covering 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 preset airtight performance, and at least a part of the clamped portion constitutes a thin-walled portion having a thickness dimension smaller than the standard thickness dimension.

[0074] According to the building of the above-described technology 1, at least a portion of the airtight sheet that is sandwiched between the object to be covered and the covering member is composed of a thin-walled portion having a thickness smaller than the standard thickness dimension. By reducing the bulk of the airtight sheet sandwiched between the object to be covered and the sandwiching member, it is possible to suppress the formation of gaps in at least a portion between the object to be covered and the sandwiching member. As a result, even if a gap is formed, the thin-walled portion can suppress the passage of air through the gap, thus suppressing a decrease in the thermal insulation performance of the building.

[0075] (Technology 2) In the building according to Technology 1 above, the surface to be covered has a plurality of adjacent surfaces that face different directions from each other and are adjacent to each other, the clamping surface has a plurality of opposing surfaces that face each of the plurality of adjacent surfaces, and the clamped portion may be provided in the airtight sheet over a range that spans the plurality of adjacent surfaces.

[0076] When a folded-over section is formed by multiple adjacent surfaces, wrinkles and lifting tend to form in the airtight sheet placed at the folded-over section. In contrast, according to the building of Technology 2 described above, a clamped section having a thin-walled portion is placed at the folded-over section, thereby suppressing wrinkles and lifting of the airtight sheet in the area where the thin-walled portion of the folded-over section is placed. As a result, it is possible to suppress the formation of wrinkles and lifting in the airtight sheet at the folded-over section and in the airtight sheet located below the folded-over section.

[0077] (Technology 3) In the building according to Technology 1 or Technology 2 above, the member to be covered has a recess formed by a plurality of adjacent surfaces adjacent to each other, the clamping member fits into the recess, and the part to be clamped is compressed between the member to be covered and the clamping member.

[0078] According to the building of the above technology 3, wrinkles and lifting tend to form in the airtight sheet that is compressed between the member to be covered and the clamping member in the recess. However, by placing the clamped portion having a thin-walled portion in the recess, it is possible to suppress the formation of wrinkles and lifting in the airtight sheet placed in the recess.

[0079] (Technology 4) In any of the buildings described in Technology 1 to Technology 3 above, the member to be covered comprises a foundation, an upright member extending upward from the upper surface of the foundation, and an insulating material extending upward from the upper surface of the foundation on the interior side of the foundation, wherein the foundation, the upright member, and the insulating material form an upwardly opening recess, the clamping member fits into the recess from above, and the building may further have a floor surface material supported on the upper surface of the clamping member.

[0080] According to the building of the above-described technology 4, the floor material is supported by clamping members installed on the airtight sheet, so it is possible to prevent the airtightness 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 screws driven into the floor material.

[0081] (Technology 5) In any of the buildings described in Technology 1 to Technology 4 above, the thin-walled portion may have thermal shrinkability.

[0082] According to the building of the above technology 5, by heating the thin-walled section during construction, the volume of the thin-walled section can be reduced, and wrinkles and lifting that form in the thin-walled section can be further reduced.

Claims

1. A building comprising: a member to be covered having a surface to be covered; an airtight sheet that covers the surface to be covered and is airtight; and a clamping member having a clamping surface that clamps a part of the airtight sheet between itself and the surface to be covered, wherein the airtight sheet has a clamped portion that is clamped between the surface to be covered 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 part of the clamped portion constitutes a thin-walled portion having a thickness dimension smaller than the standard thickness dimension.

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

3. The building according to claim 1 or 2, wherein the member to be covered has a recess formed by a plurality of adjacent surfaces adjacent to each other, the clamping member fits into the recess, and the part to be clamped is compressed between the member to be covered and the clamping member.

4. The building according to any one of claims 1 to 3, wherein the member to be covered comprises a foundation, an upright member extending upward from the upper surface of the foundation, and an insulating material extending upward from the upper surface of the foundation on the interior side of the foundation, wherein the foundation, the upright member, and the insulating material form an upwardly opening recess, the clamping member fits into the recess from above, and the building further comprises a floor surface material supported on the upper surface of the clamping member.

5. The building according to any one of claims 1 to 4, wherein the thin-walled portion is heat-shrinkable.

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