JP7517178B2 - Building - Google Patents

Description

The present invention relates to buildings.

Conventionally, there is a building that includes a wall member and a beam that is provided on the wall member with a gap formed between the wall member and the beam, and that uses an airtight member to ensure airtightness between the wall member and the gap (for example, Patent Document 1).

Specifically, the wall member of the building has a first airtight member and a first insulating material provided on the outdoor side of the first airtight member. The building also has a second airtight member that is provided from the beam to the wall member in a side view to close the gap, and is connected to the first airtight member, and a second insulating material that is provided on the indoor side or outdoor side of the second airtight member at a position that overlaps with the gap in a side view. The first airtight member and the second airtight member ensure airtightness in the wall member and the gap.

JP 2015-10448 A

However, in the building described in Patent Document 1, the first airtight member provided in the wall member is placed in an indoor temperature environment. Therefore, in summer, the humid air that has entered the wall member from the outside is cooled on the outdoor surface of the first airtight member that is cooled by indoor air conditioning, and there is a risk of condensation forming in the wall member. Furthermore, in buildings, it is necessary to prevent condensation not only in the wall members, but also in the gaps between the wall members and the beams.

The present invention was made in consideration of these problems, and aims to provide a building that can suppress the occurrence of condensation in wall members and in gaps between wall members and beams.

After extensive investigation, the inventors have discovered that the above object can be achieved by the following invention.

The building according to one aspect of the present invention has a wall member having a first airtight member, a first insulating material provided on the indoor side of the first airtight member, a second airtight member provided on the indoor side of the first airtight member, and a second insulating material provided on the outdoor side of the first airtight member, a beam provided on the wall member with a gap formed between the beam and the wall member, a third airtight member provided from the beam to the wall member in a side view so as to close the gap and connected to the first airtight member in a state of ensuring airtightness, a third insulating material provided on the indoor side of the third airtight member at a position overlapping with the gap in a side view, a fourth airtight member provided from the beam to the wall member in a side view so as to close the gap on the indoor side of the third insulating material and connected to the second airtight member in a state of ensuring airtightness, and a fourth insulating material provided on the outdoor side of the third airtight member at a position overlapping with the gap in a side view.

According to the building of the present invention, it is possible to suppress the occurrence of condensation from the wall member to the gap between the wall member and the beam (hereinafter simply referred to as the "gap"). Specifically, in the above building, the first airtight member and the third airtight member are connected in a state in which airtightness is ensured, and the second airtight member and the fourth airtight member are connected in a state in which airtightness is ensured. As a result, an airtight line (hereinafter referred to as the "outer airtight line") is formed by the first airtight member and the third airtight member on the outside of the room from the wall member to the gap, and another airtight line (hereinafter referred to as the "inner airtight line") is formed by the second airtight member and the fourth airtight member on the inside of the room. These two airtight lines can ensure airtightness in the wall member and the gap.

In this specification, when two components are "connected in an airtight manner," this refers to a state in which the two components are directly connected and airtightness is ensured, and a state in which the two components are indirectly connected via another component and airtightness is ensured between the two components.

In addition, between the outer airtight line and the inner airtight line, a first insulating material and a third insulating material (hereinafter collectively referred to as "inner insulating materials") are provided in the wall members and gaps, and on the outdoor side of the outer airtight line, a second insulating material and a fourth insulating material (hereinafter collectively referred to as "outer insulating materials") are provided in the wall members and gaps.

Therefore, in the summer, in the above-mentioned building, the outer airtight line can prevent humid outside air from entering the space between the outer airtight line and the inner airtight line, and the inner insulation prevents the outer airtight line from being cooled by indoor air conditioning. Therefore, in the summer, the occurrence of condensation from the wall member to the gap can be prevented, and deterioration of the inner insulation due to condensation can be prevented.

Furthermore, in winter, the inner airtight line can prevent humid air from entering the space between the inner airtight line and the outer airtight line from inside the room, and the inner and outer insulation materials prevent the inner airtight line from being cooled by the low-temperature outside air. Therefore, in winter, it is possible to prevent condensation from forming in the gaps from the wall members, and to prevent deterioration of the inner and outer insulation materials due to condensation.

In cold regions, the minute amounts of moisture present between the inside and outside airtight lines can be cooled by the outside air and cause condensation, but in the above-mentioned building, the outside insulation can prevent the outside airtight lines from cooling, so condensation between the inside and outside airtight lines can also be effectively prevented.

In the above-mentioned building, the third airtight member may include an attachment portion attached to the beam, a connection portion connected to the first airtight member while ensuring airtightness, and a connecting portion connecting the attachment portion and the connection portion.

In this embodiment, the attachment portion and the connection portion are connected in the third airtight member, and a space can be defined below the attachment portion for placing the third insulating material or the fourth insulating material.

In the above-mentioned building, the connecting portion may have a first extension portion extending downward from the mounting portion, and a second extension portion extending from the tip of the first extension portion toward the inside or outside of the room and facing the underside of the beam.

In this embodiment, the third insulating material or the fourth insulating material can be stably positioned by fitting the third insulating material or the fourth insulating material between the beam and the second extension portion.

In the above-mentioned building, the connected portion may be formed from a material having greater elasticity than the attached portion and the connecting portion.

In this configuration, even if a dimensional error occurs in the gap between the beam and the wall member, the dimensional error can be absorbed by the elastic deformation of the connected portion, so that the third airtight member can be more reliably connected to the first airtight member.

In the above-mentioned building, the beam has a pair of flanges facing each other in the vertical direction and a web that connects the flanges to each other at a midpoint in the inward and outward directions, and the building may further include a restraining member that restrains the attached portion to the beam by sandwiching the attached portion and the flanges.

In this embodiment, the attachment portion of the third airtight member can be easily attached to the flange of the beam by using the restraining member.

The above-mentioned building may further include a fifth insulating material provided on the interior side of the beam.

In this configuration, in the summer, the beams can prevent humid outside air from entering the interior of the room, and the fifth insulation material can prevent the beams from being cooled by air conditioning on the interior side, thereby preventing condensation from forming on the exterior side of the beams.

The above-mentioned building may further include a beam member supported on the beam by the beam, and the fourth airtight member may cover the fifth insulating material on the indoor side of the fifth insulating material and be connected to the beam member.

In this embodiment, in winter, the fourth airtight member prevents humid air from entering the space between the beam and the fourth airtight member from inside the room, and the fifth insulating material prevents the fourth airtight member from cooling, thereby preventing condensation on the fourth airtight member in winter and deterioration of the fifth insulating material due to condensation.

The above-mentioned building may further include a sixth insulating material provided on the exterior side of the beam.

In this embodiment, in cold regions, a problem occurs in that the minute amount of humidity present in the space between the beam and the fourth airtight member is cooled by the outside air and condenses. However, in the above-mentioned building, the sixth insulation material can suppress cooling of the beam, so condensation between the beam and the fourth airtight member can also be effectively suppressed.

The present invention makes it possible to provide a building that not only keeps the interior airtight from outside air, but also prevents condensation from forming.

FIG. 1 is a partial cross-sectional view of the periphery of a wall member and a beam member of a building according to one embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line II-II of FIG. FIG. 3 is a side view of the second airtight member. FIG. 4 is a side view of the restraining member. 5A to 5C are side views of a second airtight member according to a modified example of an embodiment of the present invention, where FIG. 5A is a first modified example, FIG. 5B is a second modified example, and FIG. 5C is a third modified example.

Below, a building according to one embodiment of the present invention is described with reference to the drawings.

(Building Composition)
Fig. 1 is a partial cross-sectional view of the wall member and the beam member of the building according to the present embodiment, and Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. Fig. 3 is a side view of the second airtight member, and Fig. 4 is a side view of the restraining member. The building 1 has a column 6, a wall member 10, a beam 20, a beam member 5, a third airtight member 30, a third insulating material 40, a fourth airtight member 50, a fourth insulating material 60, a restraining member 70, a fifth insulating material 81, a sixth insulating material 82, a joist 3, and a ceiling panel 4.

Next, we will explain each element that makes up Building 1.

The columns 6 are provided at intervals in the horizontal direction (only one is shown in FIG. 2 ), and stand upright under the beam 20 with their upper ends positioned below the underside of the beam 20. The columns 6 are made of H-shaped steel, and their webs are positioned parallel to the wall member 10.

As shown in Figures 1 and 2, the wall member 10 has a first airtight member 11, a first insulating material 12 provided on the indoor side of the first airtight member 11, a second airtight member 13 provided on the indoor side of the first insulating material 12, a second insulating material 14 provided on the outdoor side of the first airtight member 11, an inner wall panel 15 provided on the indoor side of the second airtight member 13, and a frame body 16 that surrounds the top, bottom and side surfaces of the first insulating material 12.

The second insulation material 14 is made up of a number of insulation pieces, and is provided between two adjacent columns 6 and around each column 6. The insulation pieces constituting the second insulation material 14 are hard insulation materials made of extruded polystyrene foam or the like (hereinafter simply referred to as "hard insulation materials"). The insulation pieces constituting the second insulation material 14 may also be soft fiber-based insulation materials made of cellulose fiber, rock wool, glass wool or the like (hereinafter simply referred to as "soft insulation materials"). The insulation pieces constituting the second insulation material 14 may also be a combination of hard insulation materials and soft insulation materials.

The first airtight member 11 is fixed to the outer surface of the frame body 16 while covering the second insulating material 14 from the inside. The upper end of the first airtight member 11 is sandwiched between the inner surfaces of the pillars 6 and the upper end of the second insulating material 14 and the cross member at the top of the frame body 16. The first airtight member 11 is a resin sheet.

The frame body 16 is fixed to the beams 20 and floorboard material (not shown) via fixing members (not shown). Specifically, the frame body 16 has a pair of horizontal members that extend in the left-right direction and face each other in the up-down direction, and a pair of vertical members that extend in the up-down direction and face each other in the left-right direction so as to connect the right ends and left ends of the horizontal members.

The first insulating material 12 is fitted inside the frame body 16. The first insulating material 12 is a soft insulating material. The first insulating material 12 may be a hard insulating material, or both hard and soft insulating materials may be used.

The second airtight member 13 is fixed to the inner surface of the frame body 16 while covering the first insulating material 12 from the inside. Specifically, the second airtight member 13 is sandwiched between the frame body 16 and the inner wall panel 15, between the frame body 16 and the ceiling panel 4, and between the frame body 16 and the rafters 3. The second airtight member 13 is a resin sheet.

The rafters 3 are fixed to beams (not shown) via rafter supports (not shown). The ceiling panels 4 are fixed to the underside of the rafters 3 with fixing members such as nails or wood screws. The ceiling panels 4 are made of a board material such as gypsum board.

The inner wall panel 15 is fixed to the frame 16 under the ceiling panel 4 with the second airtight member 13 sandwiched between the frame 16 and the first insulating material 12. The inner wall panel 15 is a plate material such as gypsum board.

The beam 20 is provided on the wall member 10 with a gap 2 formed between the beam 20 and the wall member 10. The beam 20 is made of H-shaped steel and has a pair of flanges 22, 23 that face each other in the vertical direction, and a web 21 that connects the flanges 22, 23 to each other at a midpoint in the inward and outward directions.

The beam member 5 is supported by the beam 20 on the beam 20. Examples of the beam member 5 include a roof and flooring for the upper floors. In this embodiment, a flat roof is used as the beam member 5. Specifically, the beam member 5 is a plate-shaped member made of ALC (Autoclaved Lightweight Aerated Concrete) or the like.

The third airtight member 30 is provided from the beam 20 to the wall member 10 in a side view of the building 1 (viewed from the left and right direction in FIG. 1) so as to close the gap 2, and is directly connected to the first airtight member 11 while ensuring airtightness. As a result, the third airtight member 30, together with the first airtight member 11 and the beam 20, forms an outer airtight line.

As shown in Figures 1 and 3, the third airtight member 30 comprises an attachment portion 31 attached to the beam 20, a connection portion 32 directly connected to the first airtight member 11 while ensuring airtightness, a connecting portion 33 connecting the attachment portion 31 and the connection portion 32 so that the attachment portion 31 is located on the outdoor side of the connection portion 32, and an adhesive tape 31a provided on the upper surface of the attachment portion 31.

The mounting portion 31 extends along the underside of the beam 20 and is attached to the underside of the beam 20. Specifically, the mounting portion 31 extends from the connecting portion 33 described below toward the inside of the room. In this embodiment, the mounting portion 31 is attached to the underside of the beam 20 via adhesive tape 31a.

The connecting portion 33 has a first extension portion 33a extending downward from the outer end of the mounting portion 31, and a second extension portion 33b extending from the lower end of the first extension portion 33a toward the interior of the room and facing the lower surface of the flange 22 on the lower side of the beam 20. With this configuration, the gap 2 between the beam 20 and the wall member 10 is divided into a space that opens inward to fit the third insulating material 40, and a space outside the first extension portion 33a to provide the fourth insulating material 60. In the building 1 according to this embodiment, the first extension portion 33a is disposed directly below the web 21 of the beam 20 and parallel to the web 21.

The connected portion 32 is in close contact from above with the upper end of the first airtight member 11, which is sandwiched between the second insulating material 14 and the column 6 and the upper cross member of the frame body 16. The connected portion 32 is formed from a material that has greater elasticity than the attached portion 31 and the connecting portion 33. Specifically, the attached portion 31 and the connecting portion 33 are made of a molded iron plate, and the connected portion 32 is formed from a foamed resin that has greater elasticity than the iron plate.

The restraining member 70 restrains the attachment portion 31 to the beam 20 by clamping the attachment portion 31 of the third airtight member 30 and the portion 22a of the lower flange 22 of the beam 20 that extends toward the room side of the web 21. The restraining member 70 is provided at multiple points in the longitudinal direction (horizontal direction) of the beam 20 and the attachment portion 31.

As shown in FIG. 4, the restraining member 70 has a lower portion 71 that faces the attachment portion 31 of the third airtight member 30, an upper portion 72 that faces the upper surface of the portion 22a of the flange 22 that extends toward the indoor side, and a connecting portion 73 that connects the lower portion 71 and the upper portion 72 so that the distance between the lower portion 71 and the upper portion 72 is smaller than the total thickness dimension of the flange 22 and the attachment portion 31. The restraining member 70 of this embodiment is made of a formed metal plate.

The lower part 71 has a vertical part 71a extending vertically from the lower end of the connecting part 73, and an induction part 71b extending from the tip of the vertical part 71a in a direction away from the upper part 72 as it moves away from the connecting part 73. The upper part 72 has a proximity part 72a extending from the upper end of the connecting part 73 in a direction toward the lower part 71 as it moves away from the connecting part 73, and an induction part 72b extending from the tip of the proximity part 72a in a direction away from the lower part 71 as it moves away from the connecting part 73. The restraining member 70 can guide the flange 22 and the attached part 31 between the lower part 71 and the upper part 72 along the surfaces of both induction parts 71b and 72b. In addition, the distance between the vertical part 71a and the proximity part 72a is set to be smaller than the total thickness dimension of the flange 22 and the attached part 31. Therefore, by guiding the flange 22 and the mounting portion 31 between the lower portion 71 and the upper portion 72 as described above, the flange 22 and the mounting portion 31 can be clamped by the elastic force of the restraining member 70.

The third insulating material 40 is provided on the indoor side of the third airtight member 30 at a position overlapping the gap 2 in a side view of the building 1. Specifically, the third insulating material 40 is fitted between the mounting portion 31 and the flange 22 of the third airtight member 30 and the second extension portion 33b. The third insulating material 40 is made of a hard insulating material, similar to the second insulating material 14. The third insulating material 40 may be a soft insulating material, or may be a fire-resistant coating material having insulating properties. The third insulating material 40 may also use two or more of a hard insulating material, a soft insulating material, and a fire-resistant coating material.

The fourth airtight member 50 is provided from the beam 20 to the wall member 10 in a side view of the building 1 so as to close the gap 2 on the indoor side of the third insulating material 40, and is directly connected to the second airtight member 13 while ensuring airtightness. As a result, the fourth airtight member 50 forms an inner airtight line together with the second airtight member 13. Furthermore, the fourth airtight member 50 covers the fifth insulating material 81 on the indoor side of the fifth insulating material 81 described later, and is connected to the beam member 5. The fourth airtight member 50 may be made of a plate-shaped moisture-proof member or a sheet-shaped moisture-proof member. Furthermore, the fourth airtight member 50 may be made of urethane foam formed by spraying.

The fourth insulating material 60 is provided on the outdoor side of the third airtight member 30 at a position overlapping with the gap 2 in a side view of the building 1. Specifically, the fourth insulating material 60 is arranged on the outdoor side of the first extension portion 33a of the third airtight member 30 so as to connect the lower surface of the beam 20 and the upper surface of the second insulating material 14. The fourth insulating material 60 is made of a hard insulating material, like the second insulating material 14. The fourth insulating material 60 may be a soft insulating material, or may be a fire-resistant coating material with insulating properties. Furthermore, two or more of the hard insulating material, the soft insulating material, and the fire-resistant coating material may be used.

The fifth insulating material 81 is provided on the indoor side of the beam 20. Specifically, the fifth insulating material 81 is disposed in a space surrounded by the fourth airtight member 50, the beam 20, the beam member 5, and the third insulating material 40.

The sixth insulation material 82 is provided on the outdoor side of the beam 20. Specifically, the sixth insulation material 82 is disposed on the outdoor side of the web 21 of the beam 20.

The fifth insulating material 81 and the sixth insulating material 82 are made of soft insulating materials, similar to the first insulating material 12. The fifth insulating material 81 and the sixth insulating material 82 may be hard insulating materials or may be fire-resistant coating materials with thermal insulation properties. Furthermore, two or more of hard insulating materials, soft insulating materials, and fire-resistant coating materials may be used.

(Action, Effect)
In the building 1 according to this embodiment, the occurrence of condensation can be suppressed from the wall member 10 to the gap 2. Specifically, in the building 1, the first airtight member 11, the third airtight member 30, and the beam 20 are directly connected in a state in which airtightness is ensured, and the second airtight member 13 and the fourth airtight member 50 are directly connected in a state in which airtightness is ensured. As a result, an outer airtight line is formed on the outdoor side from the wall member 10 to the gap 2 by the first airtight member 11, the third airtight member 30, and the beam 20, and an inner airtight line is formed on the indoor side by the second airtight member 13 and the fourth airtight member 50. These two airtight lines can ensure airtightness in the wall member 10 and the gap 2.

In addition, between the outer airtight line and the inner airtight line, a first insulating material 12 and a third insulating material 40 (hereinafter collectively referred to as "inner insulating materials") are provided in the wall member 10 and the gap 2, and on the outdoor side of the outer airtight line, a second insulating material 14 and a fourth insulating material 60 (hereinafter collectively referred to as "outer insulating materials") are provided in the wall member 10 and the gap 2.

Therefore, in the summer, in the building 1, the outer airtight line can prevent humid outside air from entering the space between the outer airtight line and the inner airtight line, and the inner insulation can prevent the outer airtight line from being cooled by indoor air conditioning. Therefore, in the summer, the occurrence of condensation from the wall member 10 to the gap 2 can be prevented, and deterioration of the inner insulation due to condensation can be prevented.

Furthermore, in winter, the inner airtight line can prevent humid air from entering the space between the inner airtight line and the outer airtight line from inside the room, and the inner and outer insulation materials prevent the inner airtight line from being cooled by the low-temperature outside air. Therefore, in winter, the occurrence of condensation from the wall member 10 to the gap 2 can be prevented, and deterioration of the inner and outer insulation materials due to condensation can be prevented.

In addition, in cold regions, the minute amounts of humidity present between the inside and outside airtight lines can be cooled by the outside air and cause condensation, but in Building 1, the outside insulation material can prevent the outside airtight lines from cooling, so condensation between the inside and outside airtight lines can also be effectively prevented.

In the building 1, the third airtight member 30 is connected to the attachment portion 31 and the connection portion 32 such that the attachment portion 31 is located on the outdoor side of the connection portion 32, and a space can be defined on the indoor side below the attachment portion 31 for placing the third insulating material 40. Therefore, compared to when the third airtight member 30 extends vertically above the first airtight member 11, the third insulating material 40 can be placed with reduced impact on the indoor space.

In the building 1, the connecting portion 33 of the third airtight member 30 has a first extending portion 33a extending downward from the mounting portion 31, and a second extending portion 33b extending from the tip of the first extending portion 33a toward the interior of the room and facing the underside of the beam 20. Therefore, the third insulating material 40 can be stably positioned by fitting the third insulating material 40 between the beam 20 and the second extending portion 33b.

In the building 1, the connected portion 32 of the third airtight member 30 is formed from a material that has greater elasticity than the attached portion 31 and the connecting portion 33. Therefore, even if a dimensional error occurs in the gap 2 between the beam 20 and the wall member 10, the dimensional error can be absorbed by the elastic deformation of the connected portion 32, so that the third airtight member 30 can be more reliably connected to the first airtight member 11.

In the building 1, the use of the restraining member 70 makes it easy to attach the mounting portion 31 of the third airtight member 30 from the indoor side to the portion 22a of the web 21 of the flange 22 of the beam 20 that extends indoors.

In the building 1, in the summer, the beams 20 can prevent humid outside air from entering the interior side of the beams 20, and the fifth insulation material 81 can prevent the beams 20 from being cooled by air conditioning on the interior side, thereby preventing condensation from forming on the exterior side of the beams 20.

In addition, in winter, the fourth airtight member 50 prevents humid air from entering the space between the beam 20 and the fourth airtight member 50 from inside the room, and the fifth insulating material 81 prevents the fourth airtight member 50 from cooling, thereby preventing condensation on the fourth airtight member 50 and deterioration of the fifth insulating material 81 due to condensation in winter.

Furthermore, in cold regions, the humidity in the space between the beam 20 and the fourth airtight member 50 can be cooled by the outside air, causing condensation, but in the building 1, the sixth insulation material 82 can suppress the cooling of the beam 20, so condensation between the beam 20 and the fourth airtight member 50 can also be effectively suppressed.

(Example of variation)
In the building 1 of this embodiment, the first extension portion 33a of the third airtight member 30 is described as being positioned directly below the web 21 of the beam 20, but the position of the first extension portion 33a is not limited to this and may be positioned on the indoor side or outdoor side of the web 21, or on the outdoor side of the flange 22.

In addition, although the above description has been given of the case where the connected portions 32 of the first airtight member 11 and the third airtight member 30, and the second airtight member 13 and the fourth airtight member 50 are directly connected while maintaining airtightness, they may also be indirectly connected while maintaining airtightness.

For example, the connected portion 32 of the third airtight member 30 may not be directly connected to the first airtight member 11, but may be connected to a cross member at the top of the frame body 16. In this case, since the frame body 16 is made of a material that is airtight and moisture-proof, such as wood, the connected portion 32 is indirectly connected to the first airtight member 11 via the frame body 16 while ensuring airtightness.

Furthermore, for example, the fourth airtight member 50 may not be directly connected to the second airtight member 13, but may be connected to a cross member at the top of the frame body 16. In this case, the fourth airtight member 50 is indirectly connected to the second airtight member 13 via the frame body 16 while ensuring airtightness.

The shape of the third airtight member 30 can be changed as appropriate according to the position of the first airtight member 11, which changes according to the specifications of the wall member 10. Specifically, the third airtight member 30 may have the configurations and shapes according to the modified examples shown in Figures 5(a) to (c).

5(a) shows a third airtight member 310 according to a first modified example, which includes a mounting portion 311 attached to the beam 20, a connecting portion 312 facing the mounting portion 311 and connected to the first airtight member 11 while ensuring airtightness, a connecting portion 313 connecting the mounting portion 311 and the connecting portion 312, and an adhesive tape 311a provided on the upper surface of the mounting portion 311. The connecting portion 313 has a first extension portion 313a extending downward from the inner end of the mounting portion 311, and a second extension portion 313b extending from the lower end of the first extension portion 313a to the outside of the room. The third insulating material 40 is disposed on the indoor side of the first extension portion 313a, and the fourth insulating material 60 is disposed on the outdoor side of the first extension portion 313a. At this time, the fourth insulating material 60 can be fitted between the mounting portion 311 and the second extending portion 313b. On the other hand, the third airtight member 310 can also be arranged with the inside and outside facing in the opposite direction to that shown in FIG. 5(a).

5B shows a third airtight member 320 according to a second modified example, which includes a mounting portion 321 attached to the beam 20, a connecting portion 322 connected to the first airtight member 11 while maintaining airtightness, a connecting portion 323 connecting the mounting portion 321 and the connecting portion 322, and an adhesive tape 321a provided on the upper surface of the mounting portion 321. The connecting portion 323 has a first extension portion 323a extending downward from the inner end of the mounting portion 321, and a second extension portion 323b extending from the lower end of the first extension portion 323a to the indoor side. The third insulating material 40 is disposed on the indoor side of the first extension portion 323a, and the fourth insulating material 60 is disposed on the outdoor side of the first extension portion 323a. Furthermore, when the second extension portion 323b is positioned opposite the flange 22, the third insulating material 40 can be fitted between the second extension portion 323b and the flange 22.

5(c) shows a third modified example of a third airtight member 330, which includes a mounting portion 331 attached to the beam 20, a connecting portion 332 connected to the first airtight member 11 while maintaining airtightness, a connecting portion 333 connecting the mounting portion 331 and the connecting portion 332, and an adhesive tape 331a provided on the upper surface of the mounting portion 331. The connecting portion 333 has a first extending portion 333a extending downward from the outer end of the mounting portion 331, and a second extending portion 333b extending from the lower end of the first extending portion 333a to the outside of the room. The third insulating material 40 is disposed on the indoor side of the first extending portion 333a, and the fourth insulating material 60 is disposed on the outdoor side of the first extending portion 333a. When the second extension portion 333b is positioned opposite the flange 22, the fourth insulating material 60 can be fitted between the second extension portion 333b and the flange 22. The third airtight member 330 of the third modified example is the third airtight member 320 of the second modified example, which is arranged with the indoor side and the outdoor side reversed.

When the third airtight members 310, 320, 330 are restrained to the beam 20 using the restraining member 70, the third airtight member 310 according to the first variant and the third airtight member 320 according to the second variant can restrain the attached portions 311, 321 to the beam 20 by sandwiching the attached portions 311, 321 and the portion of the web 21 on the lower flange 22 of the beam 20 that extends to the outside of the room from the outside of the room. The third airtight member 330 according to the third variant can restrain the attached portion 331 to the beam 20 by sandwiching the attached portions 311, 321 and the portion 22a of the web 21 on the lower flange 22 of the beam 20 that extends to the inside of the room from the inside of the room. It should be noted that the restraining member 70 does not have to be used when attaching the third airtight member to the beam 20, including the above-mentioned embodiment.

Depending on the positional relationship between the wall member 10 and the beam 20 and the mounting position of the third airtight members 310, 320, 330 relative to the beam 20, it may be difficult to directly connect the connected parts 312, 322, 332 to the first airtight member 11. Even in such cases, the connected parts 312, 322, 332 can be indirectly connected to the first airtight member 11 while maintaining an airtight state.

For example, as shown in Figures 5(a) and (c), by interposing the sixth airtight member 18 between the connected parts 312, 332 and the first airtight member 11, the connected parts 312, 332 can be indirectly connected to the first airtight member 11 while ensuring airtightness. This allows the first airtight member 11, the sixth airtight member 18, and the third airtight members 310, 330 to form an outer airtight line.

On the other hand, as shown in FIG. 5(b), when the connected portion 322 of the third airtight member 320 is directly connected to the first airtight member 11 while ensuring airtightness, there is no need to interpose the sixth airtight member 18. Note that FIG. 5(b) assumes that the attached portion 321 is attached to the portion of the lower flange 22 that extends to the outside of the web 21.

In the third airtight member 30, the attached portion 31 and the connecting portion 33 are made of molded iron plate, but they may be made of a flexible material such as resin. In this case, too, it is preferable that the connected portion 32 has a greater elasticity than the attached portion 31 and the connecting portion 33.

Furthermore, the sixth insulation material 82 does not need to be provided in the building 1, and it is sufficient to provide it according to the insulation performance required for the building 1.

REFERENCE SIGNS LIST 1 Building 2 Gap 5 Beam member 10 Wall member 11 First airtight member 12 First insulating material 13 Second airtight member 14 Second insulating material 20 Beam 21 Web 22 Lower flange 23 Upper flange 30, 310, 320, 330 Third airtight member 31, 311, 321, 331 Attached portion 32, 312, 322, 332 Connected portion 33, 313, 323, 333 Connecting portion 33a, 313a, 323a, 333a First extension portion 33b, 313b, 323b, 333b Second extension portion 40 Third insulating material 50 Fourth airtight member 60 Fourth insulating material 70 Restraint member 81 Fifth insulating material 82 Sixth insulating material

Claims (8)

A building,
a wall member including a first airtight member, a first insulating material provided on the indoor side of the first airtight member, a second airtight member provided on the indoor side of the first insulating material, and a second insulating material provided on the outdoor side of the first airtight member;
a beam provided on the wall member with a gap formed between the beam and the wall member;
a third airtight member provided across the beam and the wall member in a side view so as to close the gap and connected to the first airtight member in a state in which airtightness is ensured;
A third insulating material is provided on the indoor side of the third airtight member at a position overlapping with the gap in a side view;
a fourth airtight member provided from the beam to the wall member in a side view so as to close the gap on the indoor side of the third insulating material and connected to the second airtight member in a state in which airtightness is ensured;
A fourth insulating material is provided on the outdoor side of the third airtight member at a position that overlaps with the gap in a side view. The building according to claim 1, wherein the third airtight member includes an attached portion attached to the beam, a connected portion connected to the first airtight member while ensuring airtightness, and a connecting portion connecting the attached portion and the connected portion. The building according to claim 2, wherein the connecting portion has a first extension portion that extends downward from the mounting portion, and a second extension portion that extends from the tip of the first extension portion toward the inside or outside of the room and faces the underside of the beam. The building according to claim 2 or 3, wherein the connected portion is made of a material having greater elasticity than the attached portion and the connecting portion. The beam has a pair of flanges facing each other in the vertical direction and a web connecting the flanges to each other at a middle position in the inward/outward direction,
The building according to claim 2 , further comprising a restraining member that restrains the attached portion to the beam by sandwiching the attached portion and the flange. The building according to any one of claims 1 to 5, further comprising a fifth insulating material provided on the interior side of the beam. The building further includes a beam member supported on the beam by the beam,
The building according to claim 6 , wherein the fourth airtight member covers the fifth insulation material on the indoor side of the fifth insulation material and is connected to the beam member. The building according to claim 6 or 7, further comprising a sixth insulating material provided on the exterior side of the beam.