JP7108678B2 - Airtight materials and airtight structures of buildings - Google Patents

Description

TECHNICAL FIELD The present invention relates to an airtight material and an airtight structure of a building.

In recent years, in order to reduce the load on air conditioners (air conditioners), buildings are becoming more airtight. As a related technology, there is Patent Document 1.

Japanese Patent No. 5869928

By the way, gaps that reduce the airtightness of the building may be formed between the beams of the building and the ceiling-forming material. Therefore, in order to improve the airtightness of the building, it is desirable to reduce the gaps to suppress the intrusion of outside air.

The present invention has been devised in view of the actual situation as described above, and a main object thereof is to provide an airtight material capable of improving the airtightness of a building and an airtight structure of the building.

The present invention is an airtight member arranged between a beam and a ceiling forming member of a building to improve the airtightness of the building, the airtight member having a plurality of hollow portions inside which are partitioned by ribs extending parallel to each other. A face material-like base material formed of plastic cardboard, the base material defining a first direction corresponding to the longitudinal direction of the base material and a second direction orthogonal to the first direction, The rib of the plastic corrugated cardboard extends in the second direction, and the substrate includes an easily deformable portion for bending the substrate along a folding line substantially parallel to the first direction, and the easily deformable portion. a first portion positioned on one side in the second direction and brought into contact with the lower surface of the beam; and a first portion positioned on the other side in the second direction with respect to the easily deformable portion, and and a second portion for hanging from the lower surface of the beam toward the ceiling forming member, and the easily deformable portion includes a plurality of cut portions penetrating the base material on the bending line, and a plurality of cut portions between the cut portions. and a non-cut bending-rigidity-reduced portion positioned at the bending-rigidity-reduced portion, wherein the cut end face of the first portion facing the cut portion is the above-mentioned It is characterized in that it is formed on the second portion side of the bending line so as to be located on the second portion side of the bending line.

In the airtight material according to the present invention, in the second direction, the distance between the bending-rigidity-reduced portion and the bending line may be substantially equal to the thickness of the base material.

In the airtight material according to the present invention, the ceiling forming member includes a ceiling joist, and an edge of the second portion opposite to the first portion has an opening edge into which the joist can be fitted. good too.

In the airtight material according to the present invention, a slit may be formed around the edge of the opening to increase the area of the opening.

In the airtight material according to the present invention, the slit may extend along the first direction from the opening edge.

In the airtight material according to the present invention, the slits may be spaced apart in the second direction.

In the airtight material according to the present invention, the slits may be provided on both sides of the opening edge in the first direction.

In the airtight material according to the present invention, the first portion may be formed with a fixing portion for fixing to the lower surface of the beam.

The present invention is an airtight structure for a building, wherein the airtight material according to any one of the above is arranged between the beam and the ceiling forming material, the first portion being bent along the bending line, It abuts on the lower surface of the beam.

In the airtight structure of the building according to the present invention, the edge of the first portion opposite to the second portion may face the outside of the building.

In the airtight structure of the building according to the present invention, the second portion is formed with a contact portion capable of coming into contact with the upper surface of the ceiling forming member, and the second portion is provided on the side opposite to the first portion. The edge may face the outside of said building.

In the airtight structure of the building according to the present invention, the ceiling forming material may include a ceiling joist, and the joist may be fitted to an edge portion of the second portion opposite to the first portion. .

The airtight material of the present invention can improve the airtightness of a building by adopting the above configuration.

1 is a partial cross-sectional view showing an example of an airtight structure of a building in which airtight materials are arranged; FIG. FIG. 4 is a partial perspective view showing an example of an airtight material; FIG. 4 is a partial perspective view showing an example of a base material folded along a folding line; It is a partial perspective view which shows an example of the airtight material in which the joist was fitted. (a) to (c) are partial cross-sectional views showing an example of a construction method for an airtight structure of a building.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described based on the drawings. It should be understood that the drawings include exaggerated representations and representations that differ from the dimensional ratios of the actual structures in order to facilitate understanding of the content of the invention. In addition, throughout each embodiment, the same or common elements are denoted by the same reference numerals, and overlapping descriptions are omitted. Furthermore, the specific configurations shown in the embodiments and drawings are for understanding the content of the present invention, and the present invention is not limited to the illustrated specific configurations.

[Airtight structure of building]
FIG. 1 is a partial cross-sectional view showing an example of an airtight structure (hereinafter sometimes simply referred to as "airtight structure") 3 of a building 2 in which an airtight material 1 is arranged. In the airtight structure 3 of the present embodiment, the airtightness between the beams 7 and the ceiling forming members 8 is enhanced by disposing the airtight members 1 between the beams 7 and the ceiling forming members 8 of the building 2. .

[building]
The building 2 is exemplified by, for example, a house, a building, or the like. In the building 2 of the present embodiment, the lower floor portion (eg, first floor portion) 5 protrudes to the outdoor side 6 with respect to the upper floor portion (eg, second floor portion) 4, and the case where it is a so-called partial one-story building is exemplified. be done. In addition, the building 2 is not limited to such an aspect. It may be provided.

The building 2 includes beams 7 and ceiling forming members 8 .

[Beam]
The beams 7 of this embodiment are configured including roof beams 7A and floor beams 7B. In this embodiment, the roof beam 7A of the lower floor portion 5 and the floor beam 7B of the upper floor portion 4 are provided at substantially the same position in the vertical direction of the building 2 (the y-axis direction in FIG. 1). may be displaced from each other. A heat insulating material 9 is arranged on top of the ceiling forming material 8 between the roof beam 7A and the floor beam 7B.

[Ceiling forming material]
The ceiling forming member 8 includes a ceiling joist 11 and a ceiling finishing member 12. - 特許庁

[Nobori]
Although the joist 11 of the present embodiment is formed in a substantially rectangular cross section (shown in FIG. 4), it is not limited to such an aspect. The joists 11 of the present embodiment are arranged in a direction perpendicular to the longitudinal direction of the floor beam 7B (the depth direction (x-axis direction) in FIG. 1) (in FIG. 1, the direction from the indoor side to the outdoor side 6 (z direction). axial direction)). Furthermore, the joists 11 are provided in plurality at intervals in the longitudinal direction of the floor beam 7B.
[Ceiling finishing material]
The ceiling finishing material 12 is configured as a face material such as a gypsum board, for example.

[Fixing ceiling joists and ceiling finishing materials]
The joist 11 and the ceiling finishing material 12 are lifted toward the beam 7 (floor beam 7B) side during construction of the building 2 . The joists 11 are fixed to the beams 7 (floor beams 7B) via fixing members (not shown). On the other hand, the ceiling finishing material 12 is fixed to the lower surface of the joist 11 . In this embodiment, the floor beams 7B and the ceiling forming members 8 (the joist 11 and the ceiling finishing member 12) are separated from each other in the vertical direction (the y-axis direction in FIG. 1) (that is, the gap 10 is formed). is being used).

[Airtight material]
In the airtight structure 3 of the present embodiment, the airtight material 1 is arranged between the beam 7 and the ceiling forming material 8 (the ceiling joist 11 and the ceiling finishing material 12) (that is, the gap 10). FIG. 2 is a partial perspective view showing an example of the airtight material 1. As shown in FIG. FIG. 3 is a partial perspective view showing an example of the base material 14 folded along the folding line L1.

[Base material]
The airtight material 1 of this embodiment includes a base material 14 formed in the shape of a face material. The base material 14 of this embodiment is formed in an elongated shape. The substrate 14 has a first direction (the x-axis direction in the drawing) corresponding to the longitudinal direction of the substrate 14 and a second direction (the y-axis direction in the drawing) orthogonal to the first direction. It is Furthermore, in this embodiment, the thickness direction of the base material 14 (the z-axis direction in the figure) is defined.

[Plastic cardboard]
The base material 14 of this embodiment is formed of a plastic cardboard 15 . Inside the plastic cardboard 15, a plurality of hollow portions 18 partitioned by ribs 17 extending parallel to each other are provided between the pair of liners 16a and 16b. Such a plastic cardboard 15 is excellent in airtightness, durability and heat insulation.

The plastic cardboard 15 of this embodiment is made of polypropylene, but is not particularly limited. The rib 17 of this embodiment extends in the second direction (y-axis direction) before the first portion 21 is bent.

The base material 14 of this embodiment includes an easily deformable portion 20 , a first portion 21 and a second portion 22 .

[Easily deformable part]
As shown in FIG. 3, the easily deformable portion 20 is for folding the base material 14 along a folding line L1 (indicated by a dashed line in FIG. 2) substantially parallel to the first direction (x-axis direction). . In the present specification, the term “substantially parallel” means that an error in the manufacturing process is allowed, and specifically, an angle range of ±5° with respect to parallelism is allowed. The easily deformable portion 20 includes a plurality of cut portions 25 and non-cut portions with reduced bending rigidity 26 .

[Part 1]
As shown in FIG. 2, the first portion 21 is for contacting the lower surface 7s of the beam 7 (shown in FIG. 1). The first portion 21 is located on one side (upper side in the drawing) of the easily deformable portion 20 in the second direction (y-axis direction). As shown in FIG. 3, the first portion 21 is formed by bending the base material 14 along the bending line L1 (the easily deformable portion 20), thereby forming one side surface (one side liner) of the base material 14 in the thickness direction. 16a) can be abutted against the lower surface 7s of the beam 7; In the airtight structure 3 of the present embodiment, the edge of the first portion 21 opposite to the second portion 22 (hereinafter sometimes simply referred to as "first edge") 21s is the outdoor side 6 of the building (Fig. 1) is abutted against the lower surface 7s of the beam 7. As shown in FIG.

As shown in FIGS. 2 and 3, the first portion 21 of the present embodiment is formed with a fixing portion 28 for fixing to the lower surface 7s of the beam 7 (shown in FIG. 1). The fixing portion 28 of this embodiment is configured as an adhesive layer provided on the liner 16a on one side. Thereby, the first portion 21 can be stably fixed to the lower surface 7s of the beam 7 via the fixing portion 28 . The adhesive layer (fixed portion 28) is not particularly limited, but may be composed of a double-sided tape.

The fixing portion (adhesive layer) 28 is desirably provided at the manufacturing stage of the airtight material 1 . This eliminates the need to form the fixing portion 28 at the construction site of the building 2 (shown in FIG. 1), thereby improving workability.

[Part 2]
As shown in FIG. 1, the second portion 22 is for hanging from the lower surface 7s of the beam 7 toward the ceiling forming member 8 side. As shown in FIG. 2 , the second portion 22 is located on the other side (lower side in the drawing) of the easily deformable portion 20 in the second direction (y-axis direction).

[Cut part]
A plurality of cut portions 25 pass through the base material 14 (in this example, the pair of liners 16a and 16b, the ribs 17 and the hollow portion 18) on the folding line L1. The cutting portions 25 of this embodiment are spaced apart along the folding line L1. The cut portions 25 are desirably provided at both ends of the base material 14 in the first direction (x-axis direction). As a result, the easily deformable portion 20 can easily bend the base material 14 along the bending line L1.

[Bending rigidity decreased part]
The bending-rigidity-reduced portion 26 is located between the cut portions 25, 25 adjacent in the first direction (x-axis direction). The bent-rigidity-reduced portion 26 is exemplified by a ruled line (bent line) in which the base material 14 is thinly formed (in the z-axis direction in the drawing). Such bending-rigidity-reduced portions 26 help facilitate bending of the base material 14 . It should be noted that the bending-rigidity-reduced portion 26 is not limited to such ruled lines, and may be perforations (not shown) in which small holes are arranged in the liners 16a and 16b.

As shown in FIG. 2, the bending rigidity reduced portion 26 is formed closer to the second portion 22 than the bending line L1. This is because, as shown in FIG. 3, when the airtight material 1 bends the first portion 21 along the bending line L1, the cut end surface 21C facing the cut portion 25 of the first portion 21 is bent from the bending line L1. This is because the second portion 22 side (lower side in FIG. 3) is positioned. Thereby, the hollow portion 18 provided in the cut end surface 21</b>C of the first portion 21 can be closed by the second portion 22 .

As described above, in the airtight member 1 (airtight structure 3) of the present embodiment, the cut end surface 21C of the first portion 21 is closed by the second portion 22, so that the hollow portions on both sides (indoor and outdoor) of the airtight member 1 Circulation of air through 18 can be prevented. Thereby, in this embodiment, it becomes possible to improve the airtightness of the building 2 (that is, the airtightness between the beam 7 and the ceiling forming material 8). In addition, since the hollow portion 18 provided in the bending-rigidity-reduced portion 26 is closed (collapsed) by bending along the bending line L1, air circulation through the hollow portion 18 as described above is prevented. be able to.

As shown in FIG. 2, in the second direction (y-axis direction), the distance (shortest distance) D1 between the bending-rigidity-reduced portion 26 and the bending line L1 is substantially equal to the thickness W1 of the base material 14. is desirable. As a result, as shown in FIG. 3, the airtight member 1 (airtight structure 3) has a cut end surface 22C facing the cut portion 25 of the second portion 22 when the first portion 21 is folded along the folding line L1. , and the surface (liner 16a) on one side in the thickness direction of the first portion 21 can be substantially flush with each other. Therefore, the cut end surface 22C of the second portion 22 of the present embodiment can be prevented from protruding toward the lower surface 7s (shown in FIG. 1) of the beam 7 with respect to the first portion 21. The first portion 21 can be brought into contact with the lower surface 7s without a gap. Therefore, the airtight material 1 (airtight structure 3 ) can improve the airtightness of the building 2 .

In order to effectively exhibit the above effects, it is desirable to set the distance D1 to 0.8 to 1.2 times the thickness W1, as shown in FIG. Thereby, the distance D1 and the thickness W1 of the airtight material 1 can be substantially equal, and when the first portion 21 is folded along the folding line L1, the cut end surface 22C of the second portion 22 and the first The one side surface (liner 16a) of the portion 21 can be substantially flush. Note that when the fixed portion (adhesive layer) 28 is disposed on the first portion 21 as in the present embodiment, the thickness (not shown) of the fixed portion 28 and the thickness W1 of the base material 14 are may be set substantially equal to the distance D1.

As shown in FIG. 2, the total length L3 of the bending-rigidity-reduced portions 26 is preferably smaller than the total length L2 of the cut portions 25 in the first direction (x-axis direction). As a result, the easily deformable portion 20 can have a relatively small proportion of the bending-rigidity-reduced portion 26, so that the base material 14 can be easily folded along the folding line L1.

As shown in FIG. 3, in the airtight member 1 (airtight structure 3) of the present embodiment, the cut end face 21C of the first portion 21 and the second portion 22 are bent after the first portion 21 is bent along the bending line L1. The contact (frictional force) can resist the restoring force generated in the bending-rigidity-reduced portion 26 . Thereby, the airtight material 1 can be stably maintained in a folded state.

[Contact part]
As shown in FIGS. 2 and 3, the airtight member 1 of the present embodiment has a second portion 22 on which the upper surface 8s of the ceiling forming member 8 (in this example, the upper surface of the ceiling finishing member 12) is attached. 12s) is formed with an abutment portion 30 capable of abutting thereon.

The contact portion 30 of the present embodiment is formed by bending the second portion 22 at a first bending portion 31 that can be bent substantially parallel to the first direction (x-axis direction). 21 (hereinafter sometimes simply referred to as a "second edge") is formed on the side of 22s. As a result, the abutment portion 30 abuts at least a portion of one side surface (one side liner 16a) of the base material 14 in the thickness direction against the top surface 12s (shown in FIG. 1) of the ceiling finishing material 12. can be made Therefore, the airtight material 1 (airtight structure 3) can improve the adhesion with the ceiling finishing material 12, and the airtightness of the building 2 can be improved.

The first bent portion 31 can be appropriately formed as long as the second portion 22 can be bent. The first bent portion 31 of the present embodiment is formed by cutting (so-called half-cutting) the liner 16a and the rib 17 on one side. Such a first bent portion 31 allows the second portion 22 to be easily bent while maintaining the airtightness of the base material 14 by the liner 16b on the other side. In FIG. 2, the first bent portion 31 viewed from the liner 16b on the other side is indicated by a broken line.

As shown in FIG. 3, in the airtight structure 3 of this embodiment, the second portion 22 is positioned so that the second edge 22s of the second portion 22 faces the outdoor side 6 (shown in FIG. 1) of the building. It is brought into contact with the upper surface 8s (shown in FIG. 1) of the ceiling forming member 8. As shown in FIG. For this reason, it is desirable that the second edge 22s is provided with a closing portion 33 for closing the hollow portion 18 exposed at the second edge 22s. As a result, the airtight structure 3 (airtight material 1) can prevent air from circulating through the hollow portions 18 on both sides (indoor and outdoor) of the airtight material 1, so that the airtightness of the building 2 can be maintained. .

The closing portion 33 is not particularly limited as long as it can prevent the outside air A1 from entering from the second edge portion 22s. The closing part 33 of this embodiment is made of an adhesive tape having airtightness. Such a closing portion 33 can easily close the hollow portion 18 exposed at the second edge portion 22s at low cost.

[Opening edge]
As shown in FIG. 2, the airtight material 1 of this embodiment is provided with an opening edge 34 into which the joist 11 (shown in FIG. 1) can be fitted in the second edge 22s of the second portion 22. there is As a result, the airtight structure 3 (airtight material 1) is fitted along the unevenness of the ceiling forming member 8 formed by the ceiling joist 11 and the ceiling finishing material 12 by fitting the joist 11 into the opening edge 34. A second edge 22s of the two-part 22 can be arranged. Therefore, the airtight structure 3 (airtight material 1 ) can improve the airtightness of the building 2 .

The opening edge 34 of this embodiment includes a pair of first opening edges 34a, 34a and a second opening edge 34b joining the pair of first opening edges 34a, 34a. The pair of first opening edges 34a, 34a extends along the second direction (y-axis direction) from the second edge 22s toward the first portion 21 side. The second opening edge 34b extends along the first direction (x-axis direction) so as to join the ends of the pair of first opening edges 34a, 34a on the first portion 21 side. Thereby, the opening edge 34 is formed in a substantially rectangular shape in a front view similarly to the cross section of the joist 11 (shown in FIG. 4).

[slit]
The airtight member 1 of this embodiment has a slit 35 formed around the opening edge 34 to increase the opening area. The opening area is, for example, the area of the region (opening) surrounded by the opening edges 34 (a pair of first opening edges 34a, 34a and a second opening edge 34b) and a virtual line (not shown) of the second edge 22b. can be identified as

The slit 35 of this embodiment extends along the first direction (x-axis direction) from the opening edge 34 (first opening edges 34a, 34a in this example). The slit 35 of this embodiment penetrates the base material 14 . Furthermore, the slits 35 of this embodiment are spaced apart in the second direction (y-axis direction).

As shown in FIGS. 2 and 3, the slits 35, 35 adjacent in the second direction (y-axis direction) are provided with hollow portions 18 on the side of the opening edge 34 of the substrate 14 along the second direction. Thus, a bent piece 37 that can be bent in the thickness direction (z-axis direction) of the base material 14 is formed. By bending these bent pieces 37 , the airtight member 1 can increase the opening area of the opening edge 34 . Therefore, the airtight material 1 (airtight structure 3) has an error in, for example, the interval between the adjacent joists 11, 11 (the interval in the x-axis direction in FIG. 1) and the cross-sectional area of the joist 11 (shown in FIG. 4). Even if they occur, those errors can be absorbed, and the joist 11 can be securely fitted. FIG. 4 is a partial perspective view showing an example of the airtight material 1 in which the joist 11 is fitted.

The opening area may be set in advance to be smaller than the cross-sectional area of the joist 11 in the state (shown in FIG. 2) before the bent piece 37 (slit 35) is bent. As a result, as shown in FIG. 4, the airtight material 1 (airtight structure 3) is formed by appropriately bending the folding pieces 37 according to the size and arrangement position of the joists 11, thereby fitting the joists 11 and A gap between the base material 14 and the joist 11 can be made small. Therefore, the airtight material 1 can improve the airtightness of the building 2 .

A restoring force acts on the bent piece 37 to return it to the state before being bent. Thereby, since the airtight material 1 (airtight structure 3) can make the bending|folding piece 37 contact|adhere to the joist 11, the airtightness of the building 2 can be improved. The restoring force acts, for example, when the plastic corrugated cardboard 15 is bent between adjacent ribs 17 , 17 .

As shown in FIG. 4 , when both the bent piece 37 (slit 35 ) and the contact portion 30 are bent, the bent piece 37 of the contact portion 30 is positioned against the joist 11 by the other bent piece. 37 may be arranged (overlaid). Thereby, the airtight material 1 (airtight structure 3) can maintain the adhesion between the contact portion 30 and the upper surface 12s of the ceiling finishing material 12 while maintaining the adhesion between the joist 11 and the bent piece 37.

As shown in FIGS. 2 and 3, the slits 35 are preferably provided on both sides of the opening edge 34 in the first direction (x-axis direction) (first opening edges 34a, 34a in this example). As a result, the airtight material 1 (airtight structure 3) is formed with the bent pieces 37 on both sides of the opening edge 34, so that it can be It is possible to securely fit the joist 11 while improving the adhesion of the joint.

[Second bending part]
As shown in FIG. 2, in the airtight material 1 of the present embodiment, when the second portion 22 receives a force F directed toward the first portion 21 (shown in FIG. 5B), the second At least one second fold 36 is provided that deforms to reduce the dimension of the portion 22 in the second direction (y-axis direction). The force F is applied to the second portion 22 (opening edge 34) from the lifted ceiling forming member 8 (roofing 11) during construction of the building 2 (shown in FIG. 1).

The airtight member 1 (airtight structure 3) of the present embodiment is formed by the second bending portion 36 according to the dimension between the beam 7 and the ceiling forming member 8 (in this example, the ceiling joist 11). can be flexibly changed in the second direction (y-axis direction). Therefore, in this embodiment, the gap 10 between the beam 7 and the ceiling forming material 8 (ceiling finishing material 12 in this example) can be effectively reduced, and the airtightness of the building 2 can be improved. can.

The second bent portion 36 can be appropriately formed as long as it allows the deformation as described above. Similarly to the first bending portion 31, the second bending portion 36 of the present embodiment cuts the liner 16a and the rib 17 on one side (so-called , half-cut). In FIG. 2, the second bent portion 36 viewed from the other side of the liner 16b is indicated by a broken line.

The second bent portion 36 of the present embodiment extends along the first direction so as to join the opening edges 34 (second opening edges 34b) adjacent in the first direction (x-axis direction). It is not limited to a specific aspect. Also, a plurality of second bent portions 36 may be provided in the second direction (y-axis direction) of the second portion 22 . This makes it possible to reduce the dimension of the second portion 22 in the second direction more flexibly.

[Construction method for airtight structure]
Next, an example of the construction method of the airtight structure 3 will be described. 5A to 5C are partial cross-sectional views showing an example of a construction method for the airtight structure 3 of the building 2. FIG.

As shown in FIG. 5(a), in the construction method of this embodiment, first, the first part 21 of the airtight material 1 is fixed to the lower surface 7s of the beam 7 (floor beam 7B) to which the joist 11 is fixed. be done. A fixing portion (adhesive layer) 28 provided in the first portion 21 is used for fixing to the lower surface 7s of the floor beam 7B. Incidentally, when the fixing portion 28 is not provided, an adhesive or the like (not shown) may be applied.

Next, in the construction method of this embodiment, as shown in FIGS. 3 and 5B, the first portion 21 is folded along the folding line L1. Thereby, the cut end face 21C of the first portion 21 can be positioned closer to the second portion 22 than the folding line L1.

Next, as shown in FIGS. 4 and 5(b), the airtight material 1 is pulled downward while the joist 11 is fitted to the second edge 22s (opening edge 34) of the second portion 22. As shown in FIG. At this time, the bent piece 37 formed by the slit 35 is bent in the thickness direction (z-axis direction) according to the size and arrangement position of the joist 11 . As a result, the airtight material 1 (airtight structure 3) of the present embodiment is securely fitted with the joists 11 while increasing the adhesion to the joists 11 .

In FIG. 5(b), the second opening edge 34b (shown in FIG. 2) comes into contact with the upper surface of the joist 11 by pulling the airtight material 1 downward. Then, the second bent portion 36 bends (buckles) along the first direction (x-axis direction) so as to reduce the dimension of the second portion 22 in the second direction (y-axis direction).

Next, in the construction method of this embodiment, as shown in FIG. 5(c), the ceiling finishing material 12 is lifted toward the beam 7 (floor beam 7B). The upper surface 12 s of the ceiling finishing material 12 is brought into contact with the contact portion 30 of the second portion 22 . In the present embodiment, the contact portion 30 can be brought into close contact with the top surface 12s of the ceiling finishing material 12 by exerting a restoring force that causes the bent contact portion 30 to return to its original state.

In this embodiment, the ceiling finishing material 12 is fixed to the lower surface of the ceiling joist 11 while the contact portion 30 is kept in contact with the upper surface 12s of the ceiling finishing material 12 . As a result, an airtight structure 3 with a reduced gap 10 between the beam 7 and the ceiling forming member 8 is formed. Therefore, the airtight material 1 (airtight structure 3) of the present embodiment can reduce the gap 10 between the beam 7 and the ceiling forming material 8, so that the airtightness of the building 2 can be improved.

In the airtight structure 3 (airtight material 1) of the present embodiment, as shown in FIG. 3, the first portion 21 bent along the bending line L1 is formed on the lower surface 7s of the beam 7 (shown in FIG. 5(a)). 21 C of cut end surfaces of the 1st part 21 are closed by the 2nd part 22 by contact|abutting. As a result, it is possible to prevent air from circulating through the hollow portions 18 on both sides (indoor and outdoor) of the airtight material 1 . Further, the first portion 21 is in contact with the lower surface 7s of the beam 7 without any gap. Therefore, in this embodiment, it is possible to improve the airtightness of the building 2 (that is, the airtightness between the beam 7 and the ceiling forming member 8).

As shown in FIG. 5A, in the airtight structure 3 of the present embodiment, the airtight material 1 is arranged between the beam 7 and the ceiling forming material 8 (ceiling finishing material 12 in this example). , the first edge 21 s faces the exterior side 6 of the building 2 . As a result, as shown in FIG. 5C, the airtight structure 3 can guide outside air A1 entering from the outdoor side 6 to the airtight material 1 side toward the first portion (fixed portion 28). , the first portion (fixing portion 28) is pressed against the lower surface 7s side of the beam 7 (floor beam 7B). As a result, the airtight structure 3 is prevented from shifting the position of the first portion (fixed portion 28) due to the entry of the outside air A1, and from the outside air A1 from between the first portion (fixed portion 28) and the lower surface 7s of the floor beam 7B. Intrusion can be suppressed.

As shown in FIG. 5C, in the airtight structure 3 of this embodiment, the airtight material 1 is arranged between the beam 7 and the ceiling forming material 8 (ceiling finishing material 12 in this example). , the contact portion 30 is bent so that the second edge portion 22 s faces the outdoor side 6 of the building 2 . As a result, the airtight structure 3 can guide outside air A1 entering from the outdoor side 6 to the contact portion 30 side, similarly to the fixing portion 28 . Therefore, the airtight structure 3 can suppress the displacement of the contact portion 30 due to the entry of the outside air A1 and the entry of the outside air A1 from between the contact portion 30 and the ceiling forming member 8 .

As shown in FIG. 5B, in the airtight structure 3 of this embodiment, the airtight material 1 is arranged between the beam 7 and the ceiling forming material 8 (ceiling finishing material 12 in this example). , the bent piece 37 is bent so as to face the outdoor side 6 of the building 2. - 特許庁As a result, the airtight structure 3 can guide outside air A1 entering from the outdoor side 6 to the bent piece 37 side, similarly to the fixed portion 28 and the contact portion 30 . Therefore, the airtight structure 3 can suppress the displacement of the bent piece 37 due to the entry of the outside air A1 and the entry of the outside air A1 from between the bent piece 37 and the joist 11 .

The airtight member 1 (airtight structure 3) of the present embodiment is configured such that the second portion 22 is arranged in the second direction (y-axis direction) according to the dimension (dimension in the y-axis direction) between the beam 7 and the ceiling forming member 8. can be flexibly changed. Thereby, in this embodiment, the gap 10 between the beam 7 and the ceiling forming material 8 (ceiling finishing material 12 in this example) can be effectively reduced, and the airtightness of the building 2 can be improved. can be done.

[Airtight material (another example)]
As shown in FIG. 2, in the airtight material 1 of the previous embodiment, the second edge 22s of the second portion 22 is provided with an opening edge 34 into which the joist 11 can be fitted. It is not limited to a specific aspect. For example, when the ceiling joist 11 extends along the longitudinal direction of the floor beam 7B (the depth direction (x-axis direction) in FIG. 1) and the airtight material 1 does not need to fit the ceiling joist 11, the opening Edge 34 (and slit 35) may be omitted. Thereby, the airtight structure 3 can improve the airtightness of the building 2 while simplifying the structure of the airtight material 1 .

Although the particularly preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the illustrated embodiments and can be modified in various ways.

1 Airtight material 14 Base material 20 Easily deformable portion 21 First portion 22 Second portion 25 Cut portion 26 Bending rigidity reduced portion

Claims (12)

An airtight material arranged between a building beam and a ceiling forming material to improve the airtightness of the building,
Including a face material-like base material formed of plastic cardboard having a plurality of hollow parts inside which are partitioned by ribs extending parallel to each other,
the substrate defines a first direction corresponding to the longitudinal direction of the substrate and a second direction perpendicular to the first direction;
The rib of the plastic cardboard extends in the second direction,
The base material is
an easily deformable portion for bending the base material along a bending line substantially parallel to the first direction;
a first portion positioned on one side in the second direction with respect to the easily deformable portion and to be brought into contact with the lower surface of the beam;
a second portion positioned on the other side in the second direction with respect to the easily deformable portion and hanging from the lower surface of the beam toward the ceiling forming member;
The easily deformable portion includes a plurality of cut portions penetrating the base material on the bending line, and non-cut bending-rigidity-reduced portions positioned between the cut portions,
The bending-rigidity-reduced portion is arranged such that, when the first portion is folded along the folding line, the cut end surface of the first portion facing the cut portion is located closer to the second portion than the folding line. , formed on the second portion side of the bending line,
Airtight material. 2. The airtight material according to claim 1, wherein a distance between said bending rigidity reduction portion and said bending line in said second direction is substantially equal to the thickness of said base material. The ceiling forming material includes a joist,
The airtight material according to claim 1 or 2, wherein an edge portion of the second portion opposite to the first portion is provided with an opening edge into which the joist can be fitted. 4. The airtight member according to claim 3, wherein a slit is formed around the edge of the opening to increase the area of the opening. 5. The airtight material according to claim 4, wherein said slit extends from said opening edge along said first direction. The airtight material according to claim 4 or 5, wherein said slits are spaced apart in said second direction. The airtight material according to any one of claims 4 to 6, wherein the slits are provided on both sides of the opening edge in the first direction. The airtight member according to any one of claims 1 to 7, wherein the first portion has a fixing portion for fixing to the lower surface of the beam. The airtight material according to any one of claims 1 to 8 is arranged between the beam and the ceiling forming member,
The first portion is bent at the bending line and contacts the lower surface of the beam.
Airtight structure of the building. 10. The building airtight structure of claim 9, wherein the opposite edge of the first portion to the second portion faces the exterior of the building. The second portion is formed with a contact portion capable of coming into contact with the upper surface of the ceiling forming member,
11. The airtight structure of a building according to claim 9 or 10, wherein the edge of said second part opposite to said first part faces the outside of said building. The ceiling forming material includes a joist,
12. The airtight structure of a building according to any one of claims 9 to 11, wherein said joist is fitted to the edge of said second part opposite to said first part.

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