JP7743887B2 - Building and method for installing connected airtight members in the building - Google Patents

Description

The present invention relates to a building and a method for installing connected airtight members in the building.

Conventionally, buildings have been known that include a lower floor, an upper floor adjacent to the upper side of the lower floor, cross members arranged between the upper and lower floors, floor members for the upper floor having edges supported on the top surfaces of the cross members, and upper and lower floor wall members arranged on either side of the floor member, overlapping the edges of the floor member in a plan view.

For this type of building, various airtight structures have been proposed to ensure airtightness from upper to lower floors. For example, in the airtight structure shown in Figure 7 of Patent Document 1, dry wood (meaning wood with a moisture content of 20% or less) is used for the cross members, making them airtight components, and airtight film is placed along the interior sides of the lower and upper floor walls. The airtight film covering the lower floor walls is fastened to the interior sides of the cross members using a clamping material, and the airtight film covering the upper floor walls is fastened to the top surfaces of the floor members using airtight tape, etc.

Japanese Patent Application Laid-Open No. 2004-225420

However, in the airtight structure of Patent Document 1 mentioned above, the edge of the floor member is interposed between the airtight sheet covering the upper floor wall (upper floor airtight member) and the airtight sheet covering the lower floor wall (lower floor airtight member), which creates the problem of impairing the continuity of the airtight line (the line seen from the side of the airtight surface) at the edge of this floor member.

The present invention was made to solve the above-mentioned problems, and aims to ensure the continuity of the airtight line extending from the upper floor wall section to the lower floor wall section in a building that includes a cross member placed between the upper and lower floors, an upper floor floor member having an edge portion supported on the top surface of the cross member, and an upper floor wall section and a lower floor wall section that are placed on the upper and lower floor sides of the floor member, respectively, and that overlap the edge portion of the floor member in a plan view.

The first invention is a building having a lower floor and an upper floor adjacent to the upper side of the lower floor, comprising: a horizontal member arranged between the upper floor and the lower floor; a floor member of the upper floor having a plate-like shape and an edge portion supported on the upper surface of the horizontal member; a plurality of joists arranged at intervals from each other and supporting from below a portion of the floor member that is inside the edge portion; and a plurality of joists arranged on the upper floor side and the lower floor side, sandwiching the floor member, so as to overlap the edge portion of the floor member in a plan view. an upper floor wall portion and a lower floor wall portion arranged as shown in the figure, an upper floor airtight member arranged along the surface direction of the upper floor wall portion at a position overlapping the floor member in a plan view, a lower floor airtight member arranged along the surface direction of the lower floor wall portion at a position overlapping the floor member in a plan view, and a connecting airtight member formed continuously and seamlessly so as to extend at least from the upper side to the lower side of the edge portion of the floor member and connect the upper floor airtight member and the lower floor airtight member.

According to the first invention, in a building in which the edge portions of floor members are supported on the upper surfaces of cross members, the continuity of the airtight line from the upper floor wall portion to the lower floor wall portion can be ensured. In other words, in conventional buildings without connecting airtight members, the continuity between the upper floor airtight member and the lower floor airtight member is interrupted by the floor member being sandwiched between them. However, with the above-described configuration, by placing the connecting airtight member from the upper to lower sides of the edge portions of the floor members and connecting the upper floor airtight member and the lower floor airtight member via the connecting airtight member, the airtight line formed by the upper floor airtight member and the airtight line formed by the lower floor airtight member can be continuously connected via the connecting airtight member. This prevents the continuity between the upper floor airtight member and the lower floor airtight member from being interrupted by the floor member. Furthermore, with the above configuration, the connected airtight member itself is formed continuously and seamlessly, significantly reducing the labor required for construction compared to, for example, a case in which a connected airtight member is constructed by joining multiple components. Furthermore, in a building in which the edges of floor members are supported on the top surfaces of cross members as in the above configuration, the floor members function like braces in a steel-frame building, preventing lateral movement of the building and increasing stability. On the other hand, because horizontal lateral loads act on the edges of the floor members, when multiple components are joined together to form a connected member as described above, this lateral load may damage the connected airtight member. In contrast, with the above configuration, by forming a single connected airtight member continuously and seamlessly, fracture of the connected airtight member due to the lateral load can be suppressed. Therefore, the function of the floor members as braces can be maintained while preventing damage to the connected airtight member and ensuring the continuity of the airtight line from the upper floor wall to the lower floor wall. The airtight line is defined as a surface that blocks air flow in the interior and exterior directions of the building (thickness direction of each wall section) when viewed from the direction in which the cross member extends. Furthermore, "connected airtight members are formed continuously and seamlessly" means that one connected airtight member is itself formed continuously and seamlessly in the vertical direction; when multiple connected airtight members are used, they may be connected to each other with seams in the direction in which the cross member extends.

In a second invention, as in the first invention, it is preferable that the connecting airtight member has a covering portion that extends from the upper surface of the edge portion of the floor member via the outer end surface of the floor member to the underside of the edge portion and in the extension direction of the cross member, covering the edge portion; an upper connecting portion that extends upward from the indoor end of the upper part of the covering portion and is connected to the upper floor airtight member; and a lower connecting portion that extends downward from the indoor end of the lower part of the covering portion and is connected to the lower floor airtight member.

According to the second invention, the positioning of the connecting airtight member can be performed easily and accurately by engaging the covering portion of the connecting airtight member with the edge portion of the floor member. This prevents misalignment of the assembly position of the connecting airtight member, and ultimately prevents poor connections between the connecting airtight member and the airtight member of the upper floor, and between the connecting airtight member and the airtight member of the lower floor. Furthermore, with this configuration, by engaging the covering portion with the edge portion of the floor member, the connecting airtight member can be compactly positioned in the narrow space around the edge portion, thereby improving space efficiency.

A third invention is the first invention, further comprising a pair of cross members extending in opposite directions, and column members disposed between the pair of cross members and connected to each of the cross members, and the connecting airtight member includes a column airtight member attached to the connection portion of the column member with the cross member, and a pair of cross member airtight members extending along the pair of cross members and attached to each of the cross members, and it is preferable that the column airtight member and the pair of cross member airtight members connect the upper floor airtight member and the lower floor airtight member with a portion of the column airtight member and a portion of the pair of cross member airtight members overlapping each other in the interior and exterior directions of the building.

According to the third invention, the column airtight member and the cross member airtight member can form a continuous airtight line in the extension direction of the cross member. That is, in the area where the column member is located, the column airtight member forms a continuous airtight line in the vertical direction extending from the upper floor airtight member to the lower floor airtight member, and in the area where the cross member is located, the cross member airtight member forms a continuous airtight line in the vertical direction extending from the upper floor airtight member to the lower floor airtight member. These airtight lines are continuous in the extension direction of the cross member without being interrupted even at the boundary between the column airtight member and the pair of cross member airtight members, because a portion of the column airtight member and a portion of the pair of cross member airtight members overlap in the interior and exterior directions of the building. This makes it possible to maximize the airtightness of the building.

In a fourth aspect of the present invention, as in the third aspect, the column airtight member has a pair of side portions located on either side of the column member in the extension direction of the cross member, and a connecting portion extending along the indoor side surface of the column member to connect the pair of side portions, and the pair of side portions each have a side covering portion extending from the upper surface of the edge portion via the outer end surface of the floor member to the underside of the edge portion so as to cover the edge portion of the floor member, an upper side connecting portion extending upward from the indoor upper edge of the side covering portion and connected to the upper floor airtight member, a lower side connecting portion extending downward from the indoor lower edge of the side covering portion and connected to the lower floor airtight member, and a closing portion that closes the opening of the side covering portion facing the column member, and it is preferable that the pair of side portions are arranged so as to overlap the end of the cross member airtight member in the interior and exterior directions of the building.

According to the fourth aspect of the invention, the column airtight member can be attached to the column member from the indoor side by engaging the column member between a pair of side portions and abutting the connecting portion against the indoor side of the column member. Then, with the column airtight member attached to the column member, an upper floor airtight member is connected to the connecting portion above the floor member, and a lower floor airtight member is connected to the connecting portion below the floor member, ensuring continuity of the airtight line extending from the upper floor wall to the lower floor wall, even in the area where the column member is located. Furthermore, since the pair of side portions of the column airtight member are positioned so as to overlap the ends of the airtight members for each cross member in the interior/exterior direction of the building, the column airtight member and each cross member airtight member can form a continuous airtight line in the extension direction of the cross members.

In a fifth invention, in the third or fourth invention, it is preferable that each beam airtight member has a beam covering portion that extends from the upper surface of the edge portion of the floor member, via the outer end surface of the floor member, to the underside of the edge portion so as to cover the edge portion; an upper beam connecting portion that extends upward from the indoor side upper edge of the beam covering portion and connects to the upper floor airtight member; and a lower beam connecting portion that extends downward from the indoor side lower edge of the beam covering portion and connects to the lower floor airtight member.

According to the fifth invention, in the area where a pair of cross members are installed, the airtight members for each cross member ensure the continuity of the airtight line from the airtight member on the upper floor to the airtight member on the lower floor.

The sixth invention is a method for installing a connecting airtight member in a building according to the second invention, and preferably includes the following steps: a preparation step for preparing the building configuration having the cross member, the upper floor wall portion, the lower floor wall portion, the upper floor airtight member, the lower floor airtight member, and the connecting airtight member; a support fixing step for fixing joist supports that support the longitudinal ends of the joists that support the floor members to the indoor side of the cross member, sandwiching the lower floor airtight member; a joist installation step for supporting the longitudinal ends of the joists on the joist supports; and a floor member installation step for installing the floor members on the joists and cross member so that the edge portions of the floor members are covered by the covering portion.

According to the sixth aspect of the invention, in the support fixing process, the joist supports that support the joists are fixed to the indoor side of the cross member, sandwiching the lower floor airtight member between them. This eliminates the need for work such as cutting out the portion of the lower floor airtight member that corresponds to the joist support. This simplifies the work.

The seventh invention is a method for installing connecting airtight members in a building according to the second invention, and preferably includes the following steps: a preparation step for preparing the building configuration including the cross member, the upper floor wall portion, the lower floor wall portion, the upper floor airtight member, the lower floor airtight member, and the connecting airtight member; a support fixing step for fixing joist supports for supporting the ends of the joists that support the floor members to portions of the interior side of the cross member below the connecting airtight members; a cutting step for cutting away portions of the lower floor airtight members that correspond to the joist supports prior to the support fixing step; a joist installation step for supporting the longitudinal ends of the joists on the joist supports; and a floor member installation step for installing the floor members on the joists and the cross member so that the edge portions of the floor members are covered by the covering portions.

According to the seventh invention, in the cutting process, the portion of the lower floor airtight member corresponding to the joist support is cut away. Therefore, in the joist installation process, the joist support can be fixed by abutting it against the indoor side of the cross member without interposing a lower floor airtight layer between the joist support and the cross member. This allows the joist support to be firmly fixed to the cross member.

An eighth invention is a method for installing a connecting airtight member in a building, the building comprising a lower floor and an upper floor adjacent to the upper side of the lower floor, a cross member arranged between the upper floor and the lower floor, a floor member of the upper floor having an edge portion supported on an upper surface of the cross member, an upper floor wall portion and a lower floor wall portion arranged on the upper floor side and the lower floor side, respectively, with the floor member in between, and arranged so as to overlap the edge portion of the floor member in a plan view, an upper floor airtight member arranged along the surface direction of the upper floor wall portion at a position overlapping the floor member in a plan view, and a lower floor airtight member arranged along the surface direction of the lower floor wall portion at a position overlapping the floor member in a plan view. and a connecting airtight member formed continuously and seamlessly so as to extend from the upper side to the lower side of at least the edge portion of the floor member and connect the upper floor airtight member and the lower floor airtight member , the connecting airtight member comprising a covering portion extending from the upper surface of the edge portion of the floor member via the outer end surface of the floor member to the underside of the edge portion and extending in the extending direction of the cross member to cover the edge portion, an upper connecting portion extending upward from the indoor end of the upper portion of the covering portion and connected to the upper floor airtight member, and a lower connecting portion extending downward from the indoor end of the lower portion of the covering portion and connected to the lower floor airtight member. and a connecting portion, and the lower floor airtight member has a lower floor airtight main body portion made of an airtight sheet and a urethane foam layer connected to the upper end of the lower floor airtight main body portion, and the method includes a preparation process for preparing the building configuration having the horizontal member, the upper floor wall portion, the lower floor wall portion, the upper floor airtight member, the lower floor airtight main body portion of the lower floor airtight member, and the connecting airtight member, a support fixing process for fixing joist supports for supporting the ends of joists that support the floor members to parts below the connecting airtight member on the indoor side of the horizontal member, a joist installation process for supporting the longitudinal ends of the joists on the joist supports, and It is preferable that the method includes a lower floor airtight step of fixing the lower floor airtight main body portion of the floor airtight member to the lower floor wall portion so that the upper end position of the lower floor airtight main body portion of the floor airtight member is located lower than the joist support; a first connection step of connecting the lower end of the upper floor airtight member to the upper connection portion of the connecting airtight member; a second connection step of forming a foamed urethane layer by spraying foamed urethane so that the upper end of the lower floor airtight main body portion is connected to the lower connection portion of the connecting airtight member; and a floor member installation step of installing the floor member on the joists and cross members so that the edge portions of the floor member are covered by the covering portion.

According to the eighth invention, the upper end of the lower floor airtight main body and the lower connection part of the connecting airtight member are connected via a urethane foam layer (part of the lower floor airtight member) formed by spraying urethane foam. This makes it possible to easily connect the upper end of the lower floor airtight main body and the lower connection part of the connecting airtight member via the urethane foam layer while positioning the upper end of the lower floor airtight main body below the joist support. This eliminates the need for processes such as cutting out the portion of the lower floor airtight main body that corresponds to the joist support, making the work easier.

This invention ensures the continuity of the airtight line from the upper floor wall to the lower floor wall in a building that includes a cross member placed between the upper and lower floors, an upper floor floor floor member whose edge is supported on the top surface of the cross member, and an upper floor wall portion and a lower floor wall portion that are respectively placed on the upper floor side and the lower floor side of the floor member and that overlap the edge of the floor member in a plan view.

3 is an enlarged vertical cross-sectional view showing the boundary between the upper and lower floors of the building in the first embodiment. FIG. FIG. 10 is a perspective view showing a joist support attached to the indoor side of the cross member. 2 is an enlarged view of an arrangement portion of the connecting airtight member in FIG. 1 . FIG. FIG. 10 is an exploded perspective view illustrating the assembly structure of the connecting airtight member. 10 is a flowchart showing an example of a method for installing a connected airtight member. FIG. 10 is a view corresponding to FIG. 1 and shows a second embodiment. FIG. 10 is a view equivalent to FIG. 3 showing a second embodiment. FIG. 6 is a view equivalent to FIG. 5 showing a second embodiment. FIG. 10 is a view corresponding to FIG. 1 and shows a third embodiment. FIG. 10 is a view equivalent to FIG. 3 showing a third embodiment. FIG. 10 is a view equivalent to FIG. 5 showing a third embodiment. FIG. 10 is a view equivalent to FIG. 4 showing a fourth embodiment. An oblique view showing an airtight member for a pillar in embodiment 4.

(Embodiment 1)
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an enlarged longitudinal cross-sectional view showing a boundary between an upper floor 1U and a lower floor 1L in a side wall portion of a building 1 according to an embodiment of the present invention. In the following description, the left-right direction in FIG. 1 is defined as the width direction of the building, and the direction perpendicular to the paper surface is defined as the depth direction of the building. Note that these directions are defined for convenience in describing the structure of the building 1 according to an embodiment of the present invention, and do not limit the configuration of the building 1. Furthermore, in FIG. 1, as an example, the left side of the paper surface is illustrated as the indoor side, and the right side of the paper surface is illustrated as the outdoor side.

As shown in Figure 1, building 1 is a two-story wooden building with an upper floor 1U (the second floor in this example) and a lower floor 1L (the first floor in this example). Note that building 1 is not limited to being two stories high, and may be, for example, three or more stories high.

The building 1 comprises a cross member 50 arranged between the upper floor 1U and the lower floor 1L and extending in the depth direction of the building; a floor substructure 22 (an example of a flooring member) that divides the upper floor 1U and the lower floor 1L into upper and lower sections; a plurality of joists 7 (only one is shown in Figure 1) that support the floor substructure 22 from below; an upper floor wall portion 4 and a lower floor wall portion 5 that are arranged on the upper floor side and the lower floor side, respectively, with the edge of the floor substructure 22 sandwiched between them; and an exterior wall portion 6 located on the outdoor side of the upper floor wall portion 4 and the lower floor wall portion 5.

The cross member 50 is made of a rectangular timber extending in the depth direction of the building. The cross member 50 is connected via multiple columns to an upper cross member (so-called eaves beam) (not shown) that extends in the depth direction of the building and is provided at the upper end of the upper-floor wall 4. As shown in FIG. 4 (described later), the multiple columns include a pair of main columns 18 (only one of which is shown in FIG. 4) connected to both end surfaces of the cross member 50 in the extension direction, and multiple upper-floor intermediate columns 43 (only two of which are shown in FIG. 4) positioned above the cross member 50 between the pair of main columns 18. The upper-floor intermediate columns 43 are composed of so-called partition columns or half columns. The lower end of the upper-floor intermediate column 43 is formed with a notch 43a that accommodates the connecting airtight member 100 (described later) (more specifically, the outer surface of the covering portion 101 of the connecting airtight member 100). The notch 43a is formed in a rectangular shape that opens to the interior when viewed from the depth direction of the building. The upper surface of the cross member 50 has multiple engagement grooves 50a (only two are shown in Figure 4) that engage with the lower ends of each upper floor intermediate column 43. Each engagement groove 50a extends in a direction perpendicular to the extension direction of the cross member 50 (the width direction of the building) and has a U-shaped cross section that opens upward.

The cross member 50 is connected via multiple pillar members to a lower cross member (so-called base) (not shown) that is provided at the lower end of the lower floor wall portion 5 and extends in the depth direction of the building. These multiple pillar members include the pair of main pillars 18 and multiple lower floor intermediate pillars 53 (only two are shown in Figure 4) that are arranged between the pair of main pillars 18 below the cross member 50. The lower floor intermediate pillars 53 are composed of so-called partition pillars or half pillars.

Returning to Figure 1, the underfloor material 22 is made of a building material such as plywood. A floor finishing material 21 is fixed to the upper surface of the underfloor material 22. The floor finishing material 21 is a so-called flooring material, and is fixed to the upper surface of the underfloor material 22 with adhesive, nails, etc. The outer edge of the floor finishing material 21 coincides with the lower end of the upper floor interior panel 15 in a plan view. The edge portion (the outer edge side end) of the underfloor material 22 protrudes outside beyond the outer edge of the floor finishing material 21 and is supported on the upper surface of the cross member 50.

The multiple joists 7 are made of rectangular cross-section timbers that extend across the width of the building (left-right in Figure 1) and are spaced apart across the depth of the building (perpendicular to the plane of the paper in Figure 1). Both longitudinal ends of each joist 7 (only one end is shown in Figure 1) are connected to the indoor side of the cross member 50 via joist supports 8.

Figure 2 is a perspective view showing a joist support 8 attached to the indoor side of a cross member 50. As shown in this figure, the joist support 8 has a support body 81 with a U-shaped cross section that opens upward, and a pair of mounting plates 82 connected to both end edges of the support body 81. The support body 81 is fixed to the indoor side of the cross member 50 with mounting screws (not shown) that pass through the pair of mounting plates 82. Each joist 7 is positioned so that its longitudinal end engages with the inside of the support body 81 of the joist support 8. Both ends of each joist 7 are then connected to the cross member 50 via the joist support 8.

Returning to Figure 1, below the plurality of floor joists 7 are arranged ceiling panels 9 that form the ceiling surface of the lower floor 1L, and a plurality of joists 10 (only one is shown in Figure 1).

Each of the multiple siding members 10 consists of square timbers with a rectangular cross section that extend across the width of the building (left-right in Figure 1), and are spaced apart across the depth of the building (perpendicular to the plane of the paper in Figure 1). Each siding member 10 is supported by a corresponding joist 7 via a hanging beam (not shown). The ceiling panel 9 is fixed to the underside of each siding member 10.

The edge (outer edge) of the ceiling panel 9 is sandwiched between the upper end surface of the lower floor interior panel 16 and the lower end surface of the base panel 11, which is fixed to the indoor side of the base timber 12. The base timber 12 is a rectangular timber extending in the depth direction of the building and is fixed to the lower end of the indoor side of the cross member 50. The upper surface of the base timber 12 is covered by the base panel 13, which is arranged horizontally along the depth direction of the building. The lower end surface of the vertically arranged base panel 14 is connected to the outdoor outer end of the upper surface of the base panel 13. Note that the base panels 13, 14 are not necessarily required, and the building 1 may not have the base panels 13, 14.

The building 1 has an attic space O located between the underfloor material 22 and the ceiling panel 9. The attic space O contains an attic insulation layer 30. The attic insulation layer 30 includes a first attic insulation material 31 and a second attic insulation material 32. In this example, the first attic insulation material 31 and the second attic insulation material 32 are made of fibrous insulation materials such as cellulose fiber, rock wool, and glass wool, but are not limited to these and may also be made of rigid insulation materials such as extruded polystyrene foam.

The first ceiling insulation material 31 is positioned adjacent to the indoor side of the base panel 11. The lower end of the first ceiling insulation material 31 abuts the upper surface of the joist 10. The upper end of the first ceiling insulation material 31 is located at the same height as the upper surface of the base panel 13 and is connected to the lower end of the second ceiling insulation material 32. Note that the base panel 13 is not necessarily required, and the building 1 may not have the base panel 13. The second ceiling insulation material 32 is positioned adjacent to the lower floor airtight member 51 (described below) that covers the indoor side of the cross member 50. The lower end of the second ceiling insulation material 32 abuts the upper surface of the base panel 13. The upper end of the second ceiling insulation material 32 abuts the underside of the floor base material 22.

[Upper floor wall configuration]
The upper floor wall portion 4 has an upper floor wall framework portion 4F, an indoor side insulating layer 42, an upper floor airtight member 41, and an upper floor interior panel 15.

The upper floor wall framework 4F includes the above-mentioned upper end cross member (so-called eaves beam, not shown) located at the upper end of the upper floor wall 4, and a plurality of column members (in this example, main columns 18 and upper floor intermediate columns 43; see Figure 4) that connect the upper end cross member to the cross member 50.

The indoor-side insulation layer 42 is composed of multiple insulation materials arranged in the spaces between the multiple column members. The lower end of the indoor-side insulation layer 42 abuts the connecting airtight member 100 (described below) that covers the outer edge of the floor underlayment 22 (more specifically, the upper surface of the covering portion 101 of the connecting airtight member 100). The outdoor side of the indoor-side insulation layer 42 abuts the underlayment 63 of the exterior wall 6. In this example, the insulation materials that make up the indoor-side insulation layer 42 are composed of the fiber-based insulation material, but this is not limited to this and may also be composed of a hard insulation material such as extruded polystyrene foam.

The upper floor airtight member 41 is composed of, for example, a single airtight sheet. The upper floor airtight member 41 is arranged along the surface of the upper floor wall portion 4 at a position that overlaps the floor underlayment material 22 in a plan view. The upper floor airtight member 41 is formed over the entire upper floor wall portion 4 when viewed from the indoor side. The upper floor airtight member 41 is fixed to the indoor side of the upper floor wall framework portion 4F with staples, tape, etc. The material of the airtight sheet that constitutes the upper floor airtight member 41 is not particularly limited, and various synthetic resin sheets such as polyethylene and polypropylene can be used.

The upper floor interior panel 15 is made of a board material such as gypsum board, and is positioned so that its inner surface faces the interior space of the upper floor 1U. The upper floor interior panel 15 is positioned vertically on the indoor side of the upper floor airtight member 41. The upper end surface of the upper floor interior panel 15 abuts against the underside of the ceiling panel (not shown) of the upper floor 1U. The lower end surface of the upper floor interior panel 15 abuts against the upper surface of the edge portion (outer edge end) of the floor finishing material 21. The outdoor side of the lower end of the upper floor interior panel 15 is fixed to a base board 17 fixed to the upper surface of the floor underlayment 22.

[Construction of lower floor wall]
The lower floor wall portion 5 has a lower floor wall framework portion 5F, an indoor side insulating layer 52, a lower floor airtight member 51, and a lower floor interior panel 16.

The lower floor wall framework 5F includes the cross member 50 that extends in the depth direction of the building at the upper end of the lower floor wall 5, and a plurality of column members (in this example, main columns 18 and lower floor intermediate columns 53; see Figure 4) that connect the cross member 50 to the lower end cross member (the so-called base; not shown).

The indoor insulation layer 52 is composed of multiple insulation materials placed in the spaces between the multiple pillar members. In this example, the insulation materials are composed of the fiber-based insulation material, but this is not limited to this and may also be composed of a hard insulation material such as extruded polystyrene foam.

The lower floor airtight member 51 is composed of, for example, a single airtight sheet. The lower floor airtight member 51 is arranged along the surface of the lower floor wall portion 5 in a position that overlaps the floor underlayment material 22 in a plan view. The lower floor airtight member 51 is formed over the entire lower floor wall portion 5 when viewed from the indoor side. The lower floor airtight member 51 is fixed to the indoor side of the lower floor wall framework portion 5F with staples, tape, etc. The material of the airtight sheet that constitutes the lower floor airtight member 51 is not particularly limited, and various synthetic resin sheets such as polyethylene and polypropylene can be used.

The lower floor interior panel 16 is made of a board material such as gypsum board, and is positioned so that its inner surface faces the interior space of the lower floor 1L. The lower floor interior panel 16 is positioned vertically on the indoor side of the lower floor airtight member 51. As described above, the upper end surface of the lower floor interior panel 16 abuts against the underside of the ceiling panel 9 of the lower floor 1L. The lower end surface of the lower floor interior panel 16 abuts against the upper surface of the edge of the floor finishing material (not shown) of the lower floor 1L. The outdoor side of the lower end of the lower floor interior panel 16 is fixed to a base board (not shown) fixed to the upper surface of the floor underlayment material (not shown) of the lower floor 1L.

[Configuration of exterior wall]
The exterior wall portion 6 is located on the outdoor side of the upper floor wall portion 4 and the lower floor wall portion 5, and extends continuously in the vertical direction from the upper floor 1U to the lower floor 1L. The exterior wall portion 6 has an exterior wall panel 61, an outdoor side insulating layer 62, and a base material 63, which are arranged in this order from the outdoor side toward the indoor side.

The exterior wall panels 61 are components that form the exterior wall surfaces of the building 1 and extend in the vertical direction.

The outdoor insulation layer 62 is positioned with a small gap between it and the indoor side of the exterior wall panel 61. The outdoor insulation layer 62 can improve insulation in the direction from the inside to the outside of the building (in the example of Figure 1, the width direction of the building). The outdoor insulation layer 62 is made of a hard insulation material such as extruded polystyrene foam. However, the outdoor insulation layer 62 may also be made of the above-mentioned fiber-based insulation material.

The base material 63 is made of plywood or the like and is fixed to the indoor side of the upper floor wall frame 4F and the lower floor wall frame 5F using nails or the like. The outdoor insulation layer 62 abuts and is fixed to the outdoor side of the base material 63.

[Airtight building structure]
In the building 1, the upper floor airtight member 41 provided on the upper floor wall 4 and the lower floor airtight member 51 provided on the lower floor wall 5 are arranged to overlap the edge of the underfloor material 22 in a plan view, which may impair the continuity of the airtight line extending from the upper floor wall 4 to the lower floor wall 5 at the edge of the underfloor material 22. To avoid this problem, the building 1 of this embodiment is provided with a connecting airtight member 100 that connects the upper floor airtight member 41 and the lower floor airtight member 51.

[Configuration of connecting airtight member]
The linked airtight member 100 will be described in detail with reference to Figures 3 and 4. Figure 3 is an enlarged view of the location of the linked airtight member 100 in Figure 1, and Figure 4 is an exploded perspective view for explaining the assembly structure of the linked airtight member 100. Note that in Figure 3, the ceiling insulation layer 30 is omitted for ease of viewing.

As shown in Figure 3, the connecting airtight member 100 extends from the upper to lower edge (the outer edge) of the underfloor material 22 and is connected to the upper floor airtight member 41 and the lower floor airtight member 51. The connecting airtight member 100 itself is composed of a single airtight sheet that is formed continuously and seamlessly. The material of the airtight sheet is not particularly limited, and various synthetic resin sheets such as polyethylene and polypropylene can be used.

Specifically, the connecting airtight member 100 has a covering portion 101, an upper connecting portion 102, and a lower connecting portion 103.

The covering portion 101 extends in the depth direction of the building and has a U-shaped cross section that opens to the indoor side. The covering portion 101 engages (fits) with the edge of the floor finishing material 21 from the outdoor side.

The upper connection portion 102 consists of a rectangular plate portion connected along the entire upper edge of the indoor side of the covering portion 101 (see Figure 4). The upper connection portion 102 extends upward from the indoor upper edge of the covering portion 101 and overlaps the upper floor airtight member 41 from the outdoor side (see Figure 3). The upper connection portion 102 is connected to the upper floor airtight member 41 in a breathable manner using airtight tape (not shown). The airtight tape may have an adhesive surface on only one side or on both sides. An airtight tape with an adhesive surface on one side is positioned, for example, to cover the boundary between the lower edge of the upper floor airtight member 41 and the indoor side of the upper connection portion 102. An airtight tape with adhesive surfaces on both sides is positioned, for example, at the overlapping surface between the upper floor airtight member 41 and the upper connection portion 102.

The lower connection portion 103 consists of a rectangular plate portion connected along the entire lower edge of the indoor side of the covering portion 101 (see Figure 4). The lower connection portion 103 extends downward from the indoor side lower edge of the covering portion 101 and overlaps the lower floor airtight member 51 from the outdoor side (see Figure 3). The lower connection portion 103 is connected to the lower floor airtight member 51 in a breathable manner using airtight tape (not shown). The airtight tape may have an adhesive surface on only one side or on both sides. The airtight tape with an adhesive surface on one side is positioned, for example, to cover the boundary between the upper edge of the lower floor airtight member 51 and the indoor side of the lower connection portion 103. The airtight tape with adhesive surfaces on both sides is positioned, for example, at the overlapping surface between the lower floor airtight member 51 and the lower connection portion 103.

[Installation direction of connected airtight member]
Fig. 5 is a flowchart showing an example of a method for installing the linked airtight member 100. The method for installing the linked airtight member 100 will be described below with reference to the flow chart of Fig. 5 and the vertical cross-sectional view of Fig. 1 as appropriate.

The construction method includes a preparation process SA0, a connecting airtight member assembly process SA1, an indoor insulation layer placement process SA2, an upper floor airtight process SA3, a first connection process SA4, a lower floor airtight process SA5, a second connection process SA6, a support fixture fixing process SA7, a joist installation process SA8, and a floor member installation process SA9. In this example, these processes SA0 to SA9 are performed in this order, but the order is not limited to this and may be changed as appropriate to the extent physically possible.

In the preparation process SA0, the structure of the building 1 is prepared (constructed), including the cross members 50, upper floor wall sections 4, lower floor wall sections 5, upper floor airtight members 41, lower floor airtight members 51, and connecting airtight members 100. In other words, the preparation process SA0 is a process in which the construction of these members is completed in advance.

In the connecting airtight member assembly process SA1, the connecting airtight member 100 is assembled to the indoor-side, upper corner of the cross member 50 (see Figure 1). Specifically, as shown in Figure 1, the connecting airtight member 100 is installed on the top surface of the cross member 50 so that its covering portion 101 is open to the indoor side. At this time, two orthogonal surfaces formed by the underside of the covering portion 101 of the connecting airtight member 100 and the outdoor side of the lower connection portion 103 are engaged with the upper indoor-side corner of the cross member 50 (upper left in Figure 1). In other words, the underside of the covering portion 101 is abutted against the top surface of the cross member 50, and the outdoor side of the lower connection portion 103 is abutted against the indoor side of the cross member 50. This completes the assembly of the connecting airtight member 100 to the cross member 50.

In the indoor insulation layer placement process SA2, the insulation materials that make up the indoor insulation layer 42 of the upper floor 1U are placed in the spaces between the column members of the upper floor wall frame 4F. Also, the insulation materials that make up the indoor insulation layer 52 of the lower floor 1L are placed in the spaces between the column members of the lower floor wall frame 5F.

In the upper floor airtightness step SA3, the upper floor airtight member 41 is positioned along the surface direction of the upper floor wall portion 4 (in other words, parallel to the wall surface of the upper floor wall portion 4). At this time, the position of the upper floor airtight member 41 is adjusted so that the lower end of the upper floor airtight member 41 overlaps the upper connection portion 102 of the connecting airtight member 100 from the indoor side (an example of the building interior/exterior direction). The upper floor airtight member 41 is then fixed to the indoor side of the upper floor wall framework portion 4F using staples, tape, etc.

In the first connection step SA4, the lower end of the upper floor airtight member 41 and the upper connection portion 102 of the connecting airtight member 100 are connected in a non-airtight manner using airtight tape. The location where the airtight tape is applied has already been described.

In the lower floor airtightness step SA5, the lower floor airtight member 51 is positioned along the surface direction of the lower floor wall portion 5 (in other words, parallel to the wall surface of the lower floor wall portion 5). At this time, the position of the lower floor airtight member 51 is adjusted so that the upper end of the lower floor airtight member 51 overlaps the lower connection portion 103 of the connecting airtight member 100 from the indoor side (an example of the interior/exterior direction of the building). The lower floor airtight member 51 is then fixed to the indoor side of the lower floor wall framework portion 5F using staples, tape, etc.

In the second connection step SA6, the upper end of the lower floor airtight member 51 and the lower connection portion 103 of the connecting airtight member 100 are connected in a non-airtight manner using airtight tape. The location where the airtight tape is applied is as already explained.

In the support fixing process SA7, the joist support 8 is fixed to the indoor side of the cross member 50 at a position below the connecting airtight member 100, sandwiching the already installed lower floor airtight member 51 between them. Specifically, the pair of mounting plate portions 82 of the joist support 8 are abutted against the indoor side of the lower floor airtight member 51, and in this state the pair of mounting plate portions 82 are fixed to the cross member 50 together with the lower floor airtight member 51 with screws. This fixes the joist support 8 to the cross member 50, sandwiching the lower floor airtight member 51 between them.

In the joist installation process SA8, the longitudinal ends of each joist 7 are engaged with the support body 81 (see Figure 2) of the joist support 8, connecting the joists 7 to the cross member 50 via the joist support 8. When installation of the joists 7 is complete, the lower floor airtight member 51 is sandwiched between the longitudinal end face of the joist 7 and the indoor side of the cross member 50. Note that this sandwiched state is not shown in Figures 1 and 3, but this is because the thickness of the lower floor airtight member 51 and the connecting airtight member 100 are exaggerated and depicted as thicker than they actually are. In reality, the lower floor airtight member 51 is sandwiched between the end face of the joist 7 and the cross member 50.

In floor component installation process SA9, the edge of the underfloor material 22 is engaged with the covering portion 101 of the already installed connecting airtight member 100 from the indoor side, and the underside of the underfloor material 22 is supported on the upper surface of each joist 7. After installation of the underfloor material 22 is completed, the floor finishing material 21 is fixed to the upper surface of the underfloor material 22 with an adhesive or the like. The floor finishing material 21 and the underfloor material 22 may also be joined together in advance to form a single floor panel unit.

Floor finishing material 21, floor underlayment material 22, and joists 7 may also be pre-unitized to form a single floor panel. In this case, joist installation process SA8, in which the ends of the joists 7 that make up the floor panel are engaged with joist supports 8, and floor member installation process SA9, in which the edge of the floor finishing material 21 is engaged with the covering portion 101 of the connecting airtight member 100, are carried out simultaneously.

[Action and effect]
As described above, in this embodiment, the building 1 comprises an upper floor airtight member 41 arranged along the surface of the upper floor wall 4 at a position overlapping the floor underlayment 22 (an example of a floor member) in a plan view, a lower floor airtight member 51 arranged along the surface of the lower floor wall 5 at a position overlapping the floor underlayment 22 (an example of a floor member) in a plan view, and a connecting airtight member 100 formed continuously and seamlessly so as to extend from the upper side to the lower side of the edge of the floor underlayment 22 and connect the upper floor airtight member 41 and the lower floor airtight member 51 (see Figures 1 and 3).

With this configuration, the airtight line formed by the upper floor airtight member 41 and the airtight line formed by the lower floor airtight member 51 can be continuously connected via the connecting airtight member 100. This prevents the continuity of the airtight line extending from the upper floor wall 4 to the lower floor wall 5 from being interrupted by the underfloor material 22. Moreover, with this configuration, the connecting airtight member 100 itself is formed continuously and seamlessly, significantly reducing the labor required to install the connecting airtight member 100 compared to, for example, constructing a connecting airtight member by joining multiple components. Furthermore, in a building 1 in which the edge portions of the underfloor material 22 are supported on the top surfaces of the cross members 50 as in the above configuration, the underfloor material 22 functions like a brace in a steel-frame building, preventing lateral movement of the building 1 and increasing stability. On the other hand, because horizontal lateral loads act on the edges of the underfloor material 22, if a connecting member is constructed by joining multiple components as described above, there is a risk that this lateral load will damage the connecting airtight member. In contrast, with the above-described configuration, by forming a single connecting airtight member 100 continuously and seamlessly, it is possible to prevent the connecting airtight member 100 from breaking due to such lateral loads. This ensures the function of the underfloor material 22 as a brace while preventing damage to the connecting airtight member 100 due to the lateral load and ensuring the continuity of the airtight line from the upper floor wall 4 to the lower floor wall 5.

In addition, in this embodiment, the connecting airtight member 100 includes a covering portion 101 that extends from the upper surface of the edge portion of the underfloor material 22, via the outer end surface of the underfloor material 22, to the underside of the edge portion and in the extension direction of the cross member 50, covering the edge portion; an upper connecting portion 102 that extends upward from the indoor end of the upper indoor portion of the covering portion 101 and connects to the upper floor airtight member 41; and a lower connecting portion 103 that extends downward from the indoor end of the lower indoor portion of the covering portion 101 and connects to the lower floor airtight member 51 (see Figures 1 and 3).

With this configuration, the covering portion 101 of the connecting airtight member 100 can be engaged with the edge of the underfloor material 22, allowing the connecting airtight member 100 to be positioned easily and accurately. This prevents misalignment of the assembled connecting airtight member 100, and ultimately prevents poor connections between the connecting airtight member 100 and the upper floor airtight member 41, and between the connecting airtight member 100 and the lower floor airtight member 51. Furthermore, with this configuration, by engaging the covering portion 101 with the edge of the underfloor material 22, the connecting airtight member 100 can be compactly positioned in the narrow space around that edge.

Furthermore, according to the construction method for the connecting airtight member 100 of this embodiment, the lower end of the upper floor airtight member 41 is connected to the upper connection portion 102 of the connecting airtight member 100 in the first connection step SA4 (see FIG. 5), and the upper end of the lower floor airtight member 51 is connected to the lower connection portion 103 of the connecting airtight member 100 in the second connection step SA6. This allows the airtight line formed by the upper floor airtight member 41 and the airtight line formed by the lower floor airtight member 51 to be continuously connected via the connecting airtight member 100. This ensures the continuity of the airtight line from the upper floor wall portion 4 to the lower floor wall portion 5. Furthermore, according to the construction method, the joist support 8 is fixed to the indoor side of the cross member 50 with the lower floor airtight member 51 sandwiched therebetween in the support fixing step SA7, eliminating the need to perform work such as cutting off the portion of the lower floor airtight member 51 corresponding to the joist support 8. This makes it easy to install the lower floor airtight member 51.

(Embodiment 2)
6 and 7 are equivalent to FIGS. 1 and 3 and show a building 1 of embodiment 2. This embodiment 2 differs from embodiment 1 in that the portion of the lower floor airtight member 51 corresponding to the joist support 8 is removed, and the joist support 8 is attached directly to the indoor side of the cross member 50 without overlapping with the lower floor airtight member 51. In the following embodiments, the same components as those in embodiment 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

That is, as shown in Figures 6 and 7, a notch 51a is formed in the lower floor airtight member 51 in the portion corresponding to the joist support 8. The shape of the notch 51a matches the shape of the joist support 8 projected onto the cross member 50 when viewed from the width direction of the building. It is preferable to apply airtight tape to the boundary between the outer edge of this notch 51a and the joist support 8 to make it airtight. This ensures airtightness at the boundary between the notch 51a and the joist support 8. The joist support 8 is fixed to the indoor side of the cross member 50 with mounting screws, with a pair of mounting plate portions 82 abutting against the indoor side of the cross member 50.

Figure 8 is a flowchart showing an example of a method for installing the linked airtight member 100 in embodiment 2. Below, the method for installing the linked airtight member 100 will be explained, referring to the flow chart in Figure 8 and the longitudinal cross-sectional view in Figure 6 as appropriate.

The construction method includes a preparation step SB0, a connecting airtight member assembly step SB1, a support fixture fixing step SB2, a joist installation step SB3, a floor member installation step SB4, an indoor insulation layer placement step SB5, an upper floor airtightness step SB6, a first connection step SB7, a lower floor airtightness step SB8, and a second connection step SB9. In this example, these steps SB0 to SB9 are performed in this order, but the order of execution is not limited to this and may be changed as appropriate to the extent physically possible.

The preparation step SB0 and the connecting airtight member assembly step SB1 are similar to the preparation step SA0 and the connecting airtight member assembly step SA1 in embodiment 1, and therefore their description will be omitted.

In the support fixing process SB2, the joist supports 8 are fixed to the indoor side of the cross member 50. Specifically, the pair of mounting plate portions 82 of the joist supports 8 are abutted against the indoor side of the cross member 50, and in this state, the pair of mounting plate portions 82 are fixed directly to the cross member 50 with screws (without sandwiching the lower floor airtight member 51).

In the joist installation process SB3, the longitudinal ends of each joist 7 are engaged with the support body portion 81 (see Figure 2) of the joist support 8, thereby connecting the joists 7 to the cross member 50 via the joist support 8.

After the joist installation process SB3 is performed, the floor member installation process SB4, the indoor insulation layer placement process SB5, the upper floor airtightness process SB6, and the first connection process SB7 are performed in sequence. These processes SB4 to SB7 are similar to the floor member installation process SA9, the indoor insulation layer placement process SA2, the upper floor airtightness process SA3, and the first connection process SA4 in embodiment 1, so detailed descriptions of them will be omitted.

After the first connection step SB7 is performed, the lower floor airtight step SB8 is performed. In the lower floor airtight step SB8, the lower floor airtight member 51 is positioned along the surface direction of the lower floor wall portion 5 (in other words, parallel to the wall surface of the lower floor wall portion 5). Specifically, the position of the lower floor airtight member 51 is adjusted so that the upper end of the lower floor airtight member 51 overlaps the lower connection portion 103 of the connecting airtight member 100 from the inside of the building (an example of the inside/outside direction of the building). The lower floor airtight member 51 is then fixed to the indoor side of the lower floor wall framework portion 5F using staples, tape, etc.

Here, the lower floor airtightness step SB8 of this embodiment includes a cutting step SB81 in which the portion of the lower floor airtight member 51 that corresponds to the joist support 8 is cut out to form the cutout portion 51a in the lower floor airtight member 51. The lower floor airtightness step SB8 may further include a cutout portion airtightness step SB82 in which airtight tape is applied to the boundary between the cutout portion 51a of the lower floor airtight member 51 and the joist support 8. This ensures airtightness at the boundary (edge of the cutout portion) between the lower floor airtight member 51 and the joist support 8. The airtight tape may have an adhesive surface on only one side or on both sides.

After the lower floor airtightness step SB8 is performed, in the second connection step SC9, the upper end of the lower floor airtight member 51 and the lower connection portion 103 of the connecting airtight member 100 are connected using airtight tape to prevent air from passing through. The location where the airtight tape is applied has already been explained.

[Action and effect]
As described above, according to the construction method of the connecting airtight member 100 of this embodiment, in the first connecting step SB7, the lower end of the upper floor airtight member 41 is connected to the upper connecting portion 102 of the connecting airtight member 100, and in the second connecting step SB9, the upper end of the lower floor airtight member 51 is connected to the lower connecting portion 103 of the connecting airtight member 100, thereby continuously connecting the airtight line formed by the upper floor airtight member 41 and the airtight line formed by the lower floor airtight member 51 via the connecting airtight member 100. Therefore, the same effects as those of the first embodiment can be obtained. Moreover, according to the construction method, in the cutting step SB81 of the lower floor airtight step SB8, the portion of the lower floor airtight member 51 corresponding to the joist support 8 is cut off, so that the joist support 8 can be directly abutted against the indoor side of the cross member 50 and fixed thereto without interposing the lower floor airtight member 51 between the joist support 8 and the cross member 50. Therefore, the joist support 8 can be firmly fixed to the cross member 50.

(Embodiment 3)
9 and 10 are views equivalent to FIGS. 1 and 3 showing a building 1 of embodiment 3. In this embodiment 3, the lower floor airtight member 51 comprises a lower floor airtight main body 510 made of an airtight sheet or the like and a urethane foam layer 511 connected to its upper end, and differs from embodiment 1 in that the lower connection part 103 of the connecting airtight member 100 is connected to the urethane foam layer 511 (part of the lower floor airtight member 51).

That is, as shown in Figures 9 and 10, the lower floor airtight main body 510 is positioned so that its upper edge is located slightly below the joist support 8. Specifically, the upper edge of the lower floor airtight main body 510 extends linearly in the depth direction of the building along the indoor side of the cross member 50, at a position slightly below the joist support 8.

The urethane foam layer 511 is formed so as to straddle the indoor side of the upper end of the lower floor airtight main body 510 and the indoor side of the lower connection part 103 of the linked airtight member 100. The urethane foam layer 511 is formed so as to cover the indoor side of the cross member 50 and constitutes part of the lower floor airtight member 51. The urethane foam layer 511 is formed by spraying urethane foam after the joist supports 8 are installed, as described below. Figure 11 is a flowchart showing an example of a method for installing the linked airtight member 100 in embodiment 3. The method for installing the linked airtight member 100 will be described below with reference to the flowchart in Figure 11 and the longitudinal cross-sectional view in Figure 9 as appropriate.

The construction method includes a preparation process SC0, a connecting airtight member assembly process SC1, a support fixture fixing process SC2, a floor joist installation process SC3, a floor member installation process SC4, an indoor insulation layer placement process SC5, an upper floor airtight process SC6, a first connection process SC7, a lower floor airtight process SC8, and a second connection process SC9. In this example, these processes SC0 to SC9 are performed in this order, but the order of execution is not limited to this and may be changed as appropriate to the extent physically possible.

The details of each process SC0 to SC9 will be explained below, but because the processes from the linked airtight member assembly process SC1 to the first connection process SC7 are the same as the linked airtight member assembly process SC1 to the first connection process SC7 in embodiment 2, detailed explanations will be omitted. Only the preparation process SC0, lower floor airtight process SC8, and second connection process SC9 will be explained.

Preparation process SC0 is a process for preparing the structure of the building 1, which includes cross members 50, upper floor wall sections 4, lower floor wall sections 5, upper floor airtight members 41, lower floor airtight main bodies 510 of lower floor airtight members 51, and connecting airtight members 100. In other words, preparation process SC0 is a process for completing the construction of these components in advance.

In the lower floor airtightness step SC8, the lower floor airtight main body 510 is positioned along the surface of the lower floor wall 5 (in other words, parallel to the wall surface of the lower floor wall 5). At this time, the position of the lower floor airtight main body 510 is adjusted so that the upper edge of the lower floor airtight main body 510 is positioned slightly below the joist support 8. The lower floor airtight main body 510 is then fixed to the indoor side of the lower floor wall framework 5F using staples, tape, etc.

In the second connection step SC9, the urethane foam layer 511 is formed by spraying urethane foam onto the area spanning the lower connection portion 103 of the connecting airtight member 100 and the upper end of the lower floor airtight main body portion 510, as viewed from the indoor side of the cross member 50. This creates an impermeable connection between the lower connection portion 103 of the connecting airtight member 100 and the urethane foam layer 511, which is the upper end of the lower floor airtight member 51, and further creates an impermeable connection between the lower connection portion 103 and the lower floor airtight main body portion 510 via the urethane foam layer 511. To improve airtightness at the installation location of the joist support 8, an airtight sheet can be attached to the indoor side of the cross member 50 at least in the area corresponding to the installation location of the joist support 8 before the installation of the joist support 8. After connecting the lower floor airtight main body 510 and the lower connection part 103 of the connecting airtight member 100 via the airtight sheet, the urethane foam can be sprayed on. The area where the airtight sheet is attached may extend across the width of the cross member 50, for example, or may only cover the area corresponding to the installation location of the joist support 8.

[Action and effect]
As described above, according to the installation method of the connecting airtight member 100 of this embodiment, in the first connecting step SC7, the lower end of the upper floor airtight member 41 is connected to the upper connecting part 102 of the connecting airtight member 100, and in the second connecting step SC9, the upper end of the lower floor airtight member 51 (in this example, the urethane foam layer 511) is connected to the lower connecting part 103 of the connecting airtight member 100, thereby continuously connecting the airtight line formed by the upper floor airtight member 41 and the airtight line formed by the lower floor airtight member 51 via the connecting airtight member 100. Therefore, the same effects as those of embodiment 1 can be obtained. Moreover, according to the construction method, in the second connection step SC9, the lower floor airtight main body 510 and the lower connection part 103 of the connecting airtight member 100 are connected by spraying urethane foam, so that the upper end of the lower floor airtight main body 510 and the lower connection part 103 of the connecting airtight member 100 can be easily connected by spraying urethane foam with the upper end position of the lower floor airtight main body 510 positioned below the joist support 8. Therefore, there is no need to perform a step of cutting out the part of the lower floor airtight main body 510 that corresponds to the joist support 8, which makes the work easier.

(Embodiment 4)
Fig. 12 is a view equivalent to Fig. 4 showing embodiment 4. This embodiment 4 differs from the first embodiment in that the building 1 includes a column airtight member 120 and a pair of beam airtight members 110 (only one of which is shown in Fig. 12) as connecting airtight members.

Specifically, the building 1 comprises a main pillar 18 and a pair of cross members 50 (only one of which is shown in Figure 12) that extend in opposite directions across the main pillar 18 and are connected to the main pillar 18. In Figure 12, the cross member 50 is located only on the right side of the main pillar 18, but in reality, a cross member 50 (not shown) is also located symmetrically on the left side, and the same airtight structure as the right side is applied to this left cross member 50.

Each cross member airtight member 110 has the function of ensuring the continuity of the airtight line between the upper floor airtight member 41 and the lower floor airtight member 51 in the area where each cross member 50 is installed. The cross member airtight member 110 is configured similarly to the connecting airtight member 100 of embodiment 1. That is, the cross member airtight member 110 has a cross member covering portion 111, a cross member upper connecting portion 112, and a cross member lower connecting portion 113. The configurations of the cross member covering portion 111, cross member upper connecting portion 112, and cross member lower connecting portion 113 are similar to the configurations of the covering portion 101, upper connecting portion 102, and lower connecting portion 103 of embodiment 1, and therefore detailed description thereof will be omitted.

The column airtight member 120 has the function of ensuring the continuity of the airtight line between the upper floor airtight member 41 and the lower floor airtight member 51 in the area where the main column 18 is located.

Figure 13 is a perspective view showing a column airtight member 120. As shown in this figure, the column airtight member 120 has a pair of side portions 121 that face each other across the main column 18 (an example of a column member) in the depth direction of the building (the extension direction of the cross member 50), and a connecting portion 122 that connects the pair of side portions 121.

Each of the pair of side portions 121 has a side covering portion 121a, an upper side connecting portion 121b, a lower side connecting portion 121c, and a closing portion 121d.

The side covering portion 121a is formed with a U-shaped cross section that opens toward the interior so as to engage with the edge of the floor underlayment 22 (an example of a flooring component).

The upper side connection portion 121b extends upward from the indoor-side upper edge of the side covering portion 121a and connects to the upper floor airtight member 41. Specifically, the upper side connection portion 121b is positioned so as to overlap the upper floor airtight member 41 from the outside of the building (an example of the building's interior/exterior direction). The upper side connection portion 121b and the upper floor airtight member 41 are connected in a breathable manner using airtight tape or the like.

The lower side connection portion 121c extends downward from the lower edge of the indoor side of the side covering portion 121a and connects to the lower floor airtight member 51. Specifically, the lower side connection portion 121c is positioned so as to overlap the lower floor airtight member 51 from the outside of the building (an example of the building's interior/exterior direction). The lower side connection portion 121c and the lower floor airtight member 51 are connected in a breathable manner using airtight tape or the like.

The closing portion 121d is formed in the shape of a plate that closes the opening in the side covering portion 121a that faces the main column 18. Double-sided tape 123 is affixed to this closing portion 121d. When the column airtight member 120 is attached to the main column 18, the closing portion 121d is fixed to the side of the main column 18 via this double-sided tape 123.

The connecting portion 122 is a flat plate extending along the indoor side surface of the main pillar 18 and is formed to connect the inner edges of the pair of side portions 121. The connecting portion 122 is formed to be continuously connected to the side upper connection portion 121b and the side lower connection portion 121c to form a single flat plate. The connecting portion 122 is formed from the upper to lower sides of the underfloor material 22 when viewed from the indoor side. A pair of double-sided tapes 124 extending in the vertical direction is affixed to the contact surface of the connecting portion 122 with the main pillar 18. The connecting portion 122 is fixed to the indoor side surface of the main pillar 18 via this double-sided tape 124.

As shown in Figure 12, the column airtight member 120 is positioned so that the main column 18 engages between a pair of side portions 121 and the connecting portion 122 abuts the indoor side of the main column 18. The column airtight member 110 is positioned so that its longitudinal end overlaps one side portion 121 of the column airtight member 120 (the right side portion 121 in the example of Figure 12) from the indoor side (an example of the direction inside and outside the building) (see the two-dot chain line in Figure 12).

[Action and effect]
As described above, in this embodiment, the building 1 includes a pair of cross members 50 extending in opposite directions, and main columns 18 disposed between the pair of cross members 50 and connected to each of the cross members 50. The building 1 also includes, as connecting airtight members, column airtight members 120 attached to the connection portions of the main columns 18 with the cross members, and a pair of cross member airtight members 110 extending along the pair of cross members 50 and attached to each of the cross members 50. The column airtight members 120 and the pair of cross member airtight members 110 connect the upper floor airtight member 41 and the lower floor airtight member 51 (not shown in FIG. 12 ) in a state in which a portion of the column airtight member 120 and a portion of the pair of cross member airtight members 110 are overlapped with each other in the interior/exterior directions of the building.

With this configuration, the column airtight member 120 and the pair of cross member airtight members 110 can form a continuous airtight line in the extension direction of the cross member 50. That is, in the area where the main column 18 is located, the column airtight member 120 forms a continuous airtight line in the vertical direction extending from the upper floor airtight member 41 to the lower floor airtight member 51. In the area where the cross member 50 is located, the column airtight member 120 forms a continuous airtight line in the vertical direction extending from the upper floor airtight member 41 to the lower floor airtight member 51. These airtight lines are continuous in the extension direction of the cross member 50 without being interrupted at the boundary between the column airtight member 120 and the pair of cross member airtight members 110, because a portion of the column airtight member 120 (in this example, the side portion 121) and a portion of the pair of cross member airtight members 110 (in this example, the longitudinal ends) overlap in the interior and exterior directions of the building. This allows the airtightness of building 1 to be improved as much as possible.

Specifically, in this embodiment, the column airtight member 120 has a pair of side portions 121 located on both sides of the main column 18 in the extension direction of the cross member 50, and a portion 122 extending along the indoor side of the main column 18 to connect the pair of side portions 121. Each of the pair of side portions 121 has a side covering portion 121a that extends from the upper surface of the edge portion of the underfloor material 22, via the outer end surface of the underfloor material 22, to the underside of the edge portion so as to cover the edge; an upper side connecting portion 121b that extends upward from the indoor upper edge of the side covering portion 121a and is connected to the upper floor airtight member 41; a lower side connecting portion 121c that extends downward from the indoor lower edge of the side covering portion 121a and is connected to the lower floor airtight member 51; and a closing portion 121d that closes the opening of the side covering portion 121a facing the main column 18. The pair of side portions 121 are positioned so as to overlap the ends of the cross member airtight members 110 in the interior and exterior directions of the building.

With this configuration, the column airtight member 120 can be attached to the main column 18 from the indoor side by engaging the main column 18 between the pair of side portions 121 and abutting the connecting portion 122 against the indoor side of the main column 18. With the column airtight member 120 attached to the main column 18, an upper floor airtight member 41 can be connected to the portion of the connecting portion 122 above the underfloor material 22, and a lower floor airtight member 51 can be connected to the portion of the connecting portion 122 below the underfloor material 22, ensuring continuity of the airtight line from the upper floor wall portion 4 to the lower floor wall portion 5, even in the area where the main column 18 is located. Furthermore, the pair of side portions 121 of the column airtight member 120 are positioned so as to overlap the ends of each cross member airtight member 110 in the interior/exterior direction of the building, so that the column airtight member 120 and each cross member airtight member 110 can form a continuous airtight line in the extension direction of the cross member 50.

In addition, in this embodiment, each cross member airtight member 110 has a cross member covering portion 111 that extends from the upper surface of the edge portion of the underfloor material 22, via the outer end surface of the underfloor material 22, to the underside of the edge portion so as to cover the edge portion; an upper cross member connecting portion 112 that extends upward from the indoor side upper edge of the cross member covering portion 111 and connects to the upper floor airtight member 41; and a lower cross member connecting portion 113 that extends downward from the indoor side lower edge of the cross member covering portion 111 and connects to the lower floor airtight member 51.

With this configuration, in the area where a pair of cross members are installed, the airtight members for each cross member ensure the continuity of the airtight line from the airtight member on the upper floor to the airtight member on the lower floor.

Note that the specific embodiments described above primarily include inventions with the following configurations:

The first invention is a building having a lower floor and an upper floor adjacent to the upper side of the lower floor, comprising: a horizontal member arranged between the upper floor and the lower floor; a floor member of the upper floor having a plate-like shape and an edge portion supported on the upper surface of the horizontal member; a plurality of joists arranged at intervals from each other and supporting from below a portion of the floor member that is inside the edge portion; and a plurality of joists arranged on the upper floor side and the lower floor side, sandwiching the floor member, so as to overlap the edge portion of the floor member in a plan view. an upper floor wall portion and a lower floor wall portion arranged as shown in the figure, an upper floor airtight member arranged along the surface direction of the upper floor wall portion at a position overlapping the floor member in a plan view, a lower floor airtight member arranged along the surface direction of the lower floor wall portion at a position overlapping the floor member in a plan view, and a connecting airtight member formed continuously and seamlessly so as to extend at least from the upper side to the lower side of the edge portion of the floor member and connect the upper floor airtight member and the lower floor airtight member.

In a second invention, as in the first invention, it is preferable that the connecting airtight member has a covering portion that extends from the upper surface of the edge portion of the floor member via the outer end surface of the floor member to the underside of the edge portion and in the extension direction of the cross member, covering the edge portion; an upper connecting portion that extends upward from the indoor end of the upper part of the covering portion and is connected to the upper floor airtight member; and a lower connecting portion that extends downward from the indoor end of the lower part of the covering portion and is connected to the lower floor airtight member.

A third invention is the first invention, further comprising a pair of cross members extending in opposite directions, and column members disposed between the pair of cross members and connected to each of the cross members, and the connecting airtight member includes a column airtight member attached to the connection portion of the column member with the cross member, and a pair of cross member airtight members extending along the pair of cross members and attached to each of the cross members, and it is preferable that the column airtight member and the pair of cross member airtight members connect the upper floor airtight member and the lower floor airtight member with a portion of the column airtight member and a portion of the pair of cross member airtight members overlapping each other in the interior and exterior directions of the building.

In a fourth aspect of the present invention, as in the third aspect, the column airtight member has a pair of side portions located on either side of the column member in the extension direction of the cross member, and a connecting portion extending along the indoor side surface of the column member to connect the pair of side portions, and the pair of side portions each have a side covering portion extending from the upper surface of the edge portion via the outer end surface of the floor member to the underside of the edge portion so as to cover the edge portion of the floor member, an upper side connecting portion extending upward from the indoor upper edge of the side covering portion and connected to the upper floor airtight member, a lower side connecting portion extending downward from the indoor lower edge of the side covering portion and connected to the lower floor airtight member, and a closing portion that closes the opening of the side covering portion facing the column member, and it is preferable that the pair of side portions are arranged so as to overlap the end of the cross member airtight member in the interior and exterior directions of the building.

In a fifth invention, in the third or fourth invention, it is preferable that each beam airtight member has a beam covering portion that extends from the upper surface of the edge portion of the floor member, via the outer end surface of the floor member, to the underside of the edge portion so as to cover the edge portion; an upper beam connecting portion that extends upward from the indoor side upper edge of the beam covering portion and connects to the upper floor airtight member; and a lower beam connecting portion that extends downward from the indoor side lower edge of the beam covering portion and connects to the lower floor airtight member.

The sixth invention is a method for installing a connecting airtight member in a building according to the second invention, and preferably includes the following steps: a preparation step for preparing the building configuration having the cross member, the upper floor wall portion, the lower floor wall portion, the upper floor airtight member, the lower floor airtight member, and the connecting airtight member; a support fixing step for fixing joist supports that support the longitudinal ends of the joists that support the floor members to the indoor side of the cross member, sandwiching the lower floor airtight member; a joist installation step for supporting the longitudinal ends of the joists on the joist supports; and a floor member installation step for installing the floor members on the joists and cross member so that the edge portions of the floor members are covered by the covering portion.

The seventh invention is a method for installing connecting airtight members in a building according to the second invention, and preferably includes the following steps: a preparation step for preparing the building configuration including the cross member, the upper floor wall portion, the lower floor wall portion, the upper floor airtight member, the lower floor airtight member, and the connecting airtight member; a support fixing step for fixing joist supports for supporting the ends of the joists that support the floor members to portions of the interior side of the cross member below the connecting airtight members; a cutting step for cutting away portions of the lower floor airtight members that correspond to the joist supports prior to the support fixing step; a joist installation step for supporting the longitudinal ends of the joists on the joist supports; and a floor member installation step for installing the floor members on the joists and the cross member so that the edge portions of the floor members are covered by the covering portions.

An eighth invention is a method for installing a connecting airtight member in a building, the building comprising a lower floor and an upper floor adjacent to the upper side of the lower floor, a cross member arranged between the upper floor and the lower floor, a floor member of the upper floor having an edge portion supported on an upper surface of the cross member, an upper floor wall portion and a lower floor wall portion arranged on the upper floor side and the lower floor side, respectively, with the floor member in between, and arranged so as to overlap the edge portion of the floor member in a plan view, an upper floor airtight member arranged along the surface direction of the upper floor wall portion at a position overlapping the floor member in a plan view, and a connecting airtight member formed continuously and seamlessly so as to extend from the upper side to the lower side of at least the edge portion of the floor member and connect the upper floor airtight member and the lower floor airtight member. The connecting airtight member includes a covering portion extending from the upper surface of the edge portion of the floor member to the underside of the edge portion via the outer end surface of the floor member and extending in the extension direction of the cross member to cover the edge portion, an upper connecting portion extending upward from the indoor end of the upper portion of the covering portion and connected to the upper floor airtight member, and a connecting portion extending downward from the indoor end of the lower portion of the covering portion and connecting the lower floor airtight member to the lower floor airtight member. and a lower connecting portion connected to the floor airtight member, the lower floor airtight member having a lower floor airtight main body portion made of an airtight sheet and a urethane foam layer connected to the upper end of the lower floor airtight main body portion, and the method includes a preparation process for preparing the building configuration having the cross member, the upper floor wall portion, the lower floor wall portion, the upper floor airtight member, the lower floor airtight main body portion of the lower floor airtight member, and the connecting airtight member; a support fixing process for fixing joist supports for supporting the ends of joists that support the floor members to parts below the connecting airtight member on the indoor side of the cross member; a lower floor airtightness step of fixing the lower floor airtight main body portion to the lower floor wall portion so that the upper end position of the lower floor airtight main body portion of the lower floor airtight member is located lower than the joist support; a first connection step of connecting the lower end of the upper floor airtight member to the upper connection portion of the connecting airtight member; a second connection step of forming a urethane foam layer by spraying urethane foam so that the upper end of the lower floor airtight main body portion is connected to the lower connection portion of the connecting airtight member; and a floor member installation step of installing the floor member on the joists and cross members so that the edge portion of the floor member is covered by the covering portion.

(Other embodiments)
The above describes the building 1 and the method for installing the connecting airtight member 100 according to the embodiment of the present invention, but the present invention is not limited to this, and for example, the following modified embodiments can be adopted.

(1) In the above embodiments, the connecting airtight member 100 extends from above to below the edge of the underfloor material 22. However, the connecting airtight member 100 is not necessarily limited to a configuration that covers only the edge, and may be formed to cover the edge of the underfloor material 22 on the indoor side. In other words, it is sufficient that the connecting airtight member 100 is configured to extend at least from above to below the edge of the underfloor material 22.

(2) Furthermore, in the first to third embodiments, the workers performing each step of the method for installing the connected airtight member 100 are not limited to humans, but may be, for example, work robots.

(3) In addition, in the fourth embodiment, an example was described in which the column airtight member 120 was applied to the main column 18, but this is not limited to this. For example, the column airtight member 120 may be applied to a partition or half column that extends vertically across the cross member 50. In other words, the column airtight member 120 can be applied to any column member that extends vertically and intersects with the cross member 50.

(4) The present invention also includes any combination of the above embodiments.

1: Building 1L: Lower floor 1U: Upper floor 4: Upper floor wall 5: Lower floor wall 7: Joist 8: Joist support 18: Main column (column member)
22: Underfloor material (floor component)
41: Upper floor airtight member 50: Cross member 51: Lower floor airtight member 100: Connecting airtight member 101: Covering portion 102: Upper connecting portion 103: Lower connecting portion 110: Airtight member for cross member 111: Covering portion 112: Upper connecting portion 113: Lower connecting portion 120: Airtight member for column 121: Side portion 121a: Covering portion 121b: Upper connecting portion 121c: Lower connecting portion 121d: Blocking portion 122: Linking portion 510: Lower floor airtight main body portion 511: Urethane foam layer

Claims (8)

A building comprising a lower floor and an upper floor adjacent to the upper side of the lower floor,
A cross member disposed between the upper floor and the lower floor;
A floor member for an upper floor having a plate shape and an edge portion supported on the upper surface of the cross member;
a plurality of joists arranged at intervals from each other and supporting from below a portion of the floor member that is inside the end edge portion;
an upper floor wall portion and a lower floor wall portion disposed on the upper floor side and the lower floor side, respectively, with the floor member sandwiched therebetween, and provided so as to overlap the edge portion of the floor member in a plan view;
an upper floor airtight member provided along the surface direction of the upper floor wall portion at a position overlapping the floor member in a plan view;
a lower floor airtight member provided along the surface direction of the lower floor wall portion at a position overlapping the floor member in a plan view;
A building comprising a connecting airtight member that extends from the upper side to the lower side of at least the edge portion of the floor member and is formed continuously and seamlessly to connect the upper floor airtight member and the lower floor airtight member. 2. The building according to claim 1,
The connecting airtight member is
a covering portion that extends from the upper surface of the edge portion of the floor member through the outer end surface of the floor member to the lower surface of the edge portion and in the extending direction of the cross member, and covers the edge portion;
an upper connection portion extending upward from the indoor end of the upper portion of the covering portion and connected to the upper floor airtight member;
A building having a lower connection portion extending downward from the indoor end of the lower part of the covering portion and connected to the lower floor airtight member. 2. The building according to claim 1,
The structure further includes a pair of horizontal members extending in opposite directions from each other, and column members disposed between the pair of horizontal members and connected to each of the horizontal members,
The connecting airtight member includes a column airtight member attached to a connection portion of the column member with the cross member, and a pair of cross member airtight members extending along the pair of cross members and attached to each of the cross members,
A building in which the column airtight member and the pair of cross members airtight members connect the upper floor airtight member and the lower floor airtight member with a portion of the column airtight member and a portion of the pair of cross members airtight members overlapping each other in the interior and exterior directions of the building. 4. The building according to claim 3,
The column airtight member has a pair of side portions provided on both sides of the column member in the extension direction of the cross member, and a connecting portion extending along the indoor side surface of the column member so as to connect the pair of side portions,
A building in which the pair of side portions each have a side covering portion extending from the upper surface of the edge portion via the outer end surface of the floor member to the underside of the edge portion so as to cover the edge portion of the floor member, an upper side connecting portion extending upward from the indoor upper edge of the side covering portion and connected to the upper floor airtight member, a lower side connecting portion extending downward from the indoor lower edge of the side covering portion and connected to the lower floor airtight member, and a closing portion that closes the opening of the side covering portion facing the column member, and the pair of side portions are positioned so as to overlap the end of the airtight member for the cross member in the interior and exterior directions of the building. In the building according to claim 3 or 4,
Each airtight member for a cross member has a covering portion for a cross member that extends from the upper surface of the edge portion via the outer end surface of the floor member to the underside of the edge portion so as to cover the edge portion of the floor member, an upper connecting portion for a cross member that extends upward from the upper edge of the indoor side of the covering portion for a cross member and is connected to the upper floor airtight member, and a lower connecting portion for a cross member that extends downward from the lower edge of the indoor side of the covering portion for a cross member and is connected to the lower floor airtight member. 3. The method for installing the connected airtight member in a building according to claim 2,
a preparation process of preparing a structure of the building including the cross member, the upper floor wall portion, the lower floor wall portion, the upper floor airtight member, the lower floor airtight member, and the connecting airtight member;
a support fixing step of fixing a joist support supporting an end portion in the longitudinal direction of the joist supporting the floor member to the indoor side surface of the cross member, sandwiching the lower floor airtight member;
a joist installation process in which longitudinal ends of the joists are supported by the joist supports;
A method for installing a connecting airtight member, comprising: a floor member installation step of installing the floor member on the joists and cross members so that the edge portions of the floor member are covered by the covering portion. 3. The method for installing the connected airtight member in a building according to claim 2,
a preparation process of preparing a structure of the building including the cross member, the upper floor wall portion, the lower floor wall portion, the upper floor airtight member, the lower floor airtight member, and the connecting airtight member;
A support fixing process for fixing a joist support for supporting an end of a joist that supports the floor member to a portion below the connecting airtight member on the indoor side of the cross member;
a cutting step of cutting off a portion of the lower floor airtight member corresponding to the joist support prior to the support fixing step;
a joist installation process in which longitudinal ends of the joists are supported by the joist supports;
A method for installing a connecting airtight member, comprising: a floor member installation step of installing the floor member on the joists and cross members so that the edge portions of the floor member are covered by the covering portion. A method for installing a connected airtight member in a building, comprising:
The building comprises a lower floor and an upper floor adjacent to an upper side of the lower floor;
A cross member disposed between the upper floor and the lower floor;
A floor member of an upper floor having an edge portion supported on the upper surface of the cross member;
an upper floor wall portion and a lower floor wall portion disposed on the upper floor side and the lower floor side, respectively, with the floor member sandwiched therebetween, and provided so as to overlap the edge portion of the floor member in a plan view;
an upper floor airtight member provided along the surface direction of the upper floor wall portion at a position overlapping the floor member in a plan view;
a lower floor airtight member provided along the surface direction of the lower floor wall portion at a position overlapping the floor member in a plan view;
a connecting airtight member formed continuously and seamlessly so as to extend from the upper side to the lower side of at least the edge portion of the floor member and connect the upper floor airtight member and the lower floor airtight member;
The connecting airtight member is
a covering portion that extends from the upper surface of the edge portion of the floor member through the outer end surface of the floor member to the lower surface of the edge portion and in the extending direction of the cross member, and covers the edge portion;
an upper connection portion extending upward from the indoor end of the upper portion of the covering portion and connected to the upper floor airtight member;
a lower connection portion extending downward from the indoor end of the lower portion of the covering portion and connected to the lower floor airtight member;
The lower floor airtight member has a lower floor airtight main body made of an airtight sheet and a urethane foam layer connected to the upper end of the lower floor airtight main body,
a preparation process for preparing the building configuration including the cross member, the upper floor wall portion, the lower floor wall portion, the upper floor airtight member, the lower floor airtight main body portion of the lower floor airtight member, and the connecting airtight member;
A support fixing process for fixing a joist support for supporting an end of a joist that supports the floor member to a portion below the connecting airtight member on the indoor side of the cross member;
a joist installation process in which longitudinal ends of the joists are supported by the joist supports;
a lower floor airtight process of fixing the lower floor airtight main body portion to the lower floor wall portion so that the upper end position of the lower floor airtight main body portion of the lower floor airtight member is located below the joist support;
a first connecting step of connecting the lower end of the upper floor airtight member and the upper connecting portion of the connecting airtight member;
A second connection step of forming the urethane foam layer by spraying urethane foam so that the upper end of the lower floor airtight main body and the lower connection portion of the connecting airtight member are connected;
A method for installing a connecting airtight member, comprising: a floor member installation step of installing the floor member on the joists and cross members so that the edge portions of the floor member are covered by the covering portion.