Joint unit and interior structure of building

Abstract

To provide a joint unit which suppresses the fall of dew condensation even under a high-humidity environment, and which facilitates the mounting construction of an interior decorative material, and an interior structure of a building using the joint unit.SOLUTION: The joint unit includes a first joint member fixed to a backing member formed on the ceiling inner surface and a second joint member engaged with the first joint member, the first joint includes a first engaging portion extending along the gap and a first plate-shaped portion extending from the first engaging portion along one surface of the interior decorative member on the ceiling inner surface side, and the second joint member extends along the gap. The second engagement part is engaged with the first engagement part, and the second plate-like part extends from the second engagement part along the other surface of the interior decorative material, and the gutter-like part is connected to one end side of the second plate-like part and forms a slit-like opening part between the second plate-like part and the gutter-like part on the other end side of the second plate-like part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a joint unit to be provided at the joint between interior decorative materials, and to a building interior structure using the same. [Background technology]

[0002] For example, in factories and workshops where food is processed and cooked (hereinafter simply referred to as food factories), large amounts of generated water vapor may condense on ceilings and sidewalls, causing condensation. Such condensation can lead to the growth of mold. There is also a concern that food may be contaminated by the condensed water droplets that have entrained airborne pollutants. To address these issues, interior decorative materials that can suppress condensation even in high-humidity environments are known.

[0003] For example, Patent Documents 1 to 5 disclose bathroom ceiling panels that can suppress the occurrence of condensation. These ceiling panels are said to be able to suppress the occurrence of condensation even in high-humidity environments by forming a hydrophilic coating on the outermost surface.

[0004] However, even if such ceiling panels are used in food factories where large amounts of water vapor are generated during cooking, there is a concern that if a large amount of condensation occurs that exceeds the amount that can be retained by the hydrophilic coating, the condensed water droplets will fall from the ceiling panel.

[0005] For this reason, for example, Patent Document 5 discloses a gutter device that also functions as a retaining edge for ceiling materials. This gutter device is said to be able to prevent condensation formed on the ceiling material from falling directly by receiving and draining excess condensation using a gutter body with a U-shaped cross section that receives condensation formed on the ceiling material at the edge of the ceiling material. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Unexamined Patent Publication No. 55-139258 [Patent Document 2] Japanese Patent Application Publication No. 55-139259 [Patent Document 3] Japanese Patent Application Laid-Open No. 2000-026634 [Patent Document 4] Patent No. 4373717 [Patent Document 5] Jpn. Jpn. Appl. KOKAI Publication No. 60-033217 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the conventional gutter device disclosed in Patent Document 5, the gutter body needs to be fixed directly to the ceiling substrate, which makes it difficult to install the ceiling material.

[0008] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a joint unit that suppresses the dripping of condensation even in high humidity environments and facilitates the installation and construction of interior decorative materials, as well as a building interior structure that uses the same. [Means for solving the problem]

[0009] The decorative material for interior use of the present invention has the following configuration. (1) A joint unit according to a first aspect of the present invention is a joint unit arranged on the inner surface of a ceiling of a building in an area including gaps between ends of multiple interior decorative materials arranged at an angle with respect to a horizontal plane, the joint unit having a first joint material fixed to a base material formed on the inner surface of the ceiling and a second joint material attached to the first joint material, the first joint material having a first attachment portion extending along the gap and a first plate-shaped portion extending from the first attachment portion along one surface of the interior decorative material that is on the inner surface of the ceiling, the second joint material having a second attachment portion extending along the gap and attaching to the first attachment portion, a second plate-shaped portion extending from the second attachment portion along the other surface of the interior decorative material, and a gutter-shaped portion connected to one end of the second plate-shaped portion and forming a slit-shaped opening between the second plate-shaped portion and the second plate-shaped portion at the other end of the second plate-shaped portion that is on the upper side in the angle of the inner surface of the ceiling.

[0010] (2) The joint unit according to the second aspect of the present invention is the first aspect, wherein one end and the other end of the second plate-shaped portion are each provided with a protrusion portion made of an elastic material that protrudes toward the other surface of the interior decorative material.

[0011] (3) A joint unit according to a third aspect of the present invention is the joint unit of the first or second aspect, further comprising a joint unit connection cover formed between adjacent joint units at the connection portion between the plurality of joint units and covering each of the gutter-shaped portions.

[0012] (4) A joint unit according to a fourth aspect of the present invention is any one of the first to third aspects, wherein the joint unit further has a molding member formed on the end of the interior decorative material, and the molding member has a clamping portion with a U-shaped cross section that clamps the end of the interior decorative material, a water receiving portion extending from the clamping portion and connected to the gutter-shaped portion of the second joint material, and a side wall abutment portion that contacts the side wall surface of the building that intersects with the inner surface of the ceiling.

[0013] (5) A fifth aspect of the present invention provides a joint unit according to the fourth aspect, wherein the clamping portion and the receiving member of the molding member are formed to be rotatable or bendable relative to each other.

[0014] (6) The interior structure of a building according to the sixth aspect of the present invention comprises the joint unit of the fourth or fifth aspect and the interior decorative material, and a plurality of the interior decorative materials are arranged along the inclined inner surface of the ceiling of the building, wherein the interior decorative materials have a rectangular plate-like outer shape and are arranged so that their longitudinal direction follows the inclination direction of the inner surface of the ceiling, the second joint material of the joint unit is formed across the ends of the plurality of the interior decorative materials so that its longitudinal direction is perpendicular to the inclination direction, the molding member is formed so that its longitudinal direction follows the intersection of the inner surface of the ceiling and the side wall surface of the building, and the gutter-shaped portion of the second joint material and the water-receiving portion of the molding member are connected so that liquid can flow through them.

[0015] (7) The interior structure of a building according to the seventh aspect of the present invention is the sixth aspect, in which a vertical gutter is further formed on the lower side of the molding member in the inclined direction, connected to the end of the water receiving portion and extending along the side wall surface.

[0016] (8) The eighth aspect of the present invention relates to the interior structure of a building in the sixth or seventh aspect, wherein the interior decorative material has at least a base layer containing aluminum and a hydrophilic layer containing a hydrophilic resin and having a thickness of 1.5 μm or more and 100 μm or less, which is disposed on one side of the base layer and overlaps the base layer. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic cross-sectional view showing an example of an interior decorative material that constitutes the interior structure of a building of the present invention. [Figure 2] 1 is a schematic diagram showing the interior structure of a building equipped with a joint unit according to one embodiment of the present invention and an interior decorative material. [Figure 3] FIG. 4 is an enlarged cross-sectional view of a main part showing the configuration of a joint unit. [Figure 4] FIG. 10 is an enlarged cross-sectional view of a main part showing a configuration in which a joint unit connection portion cover is further provided on the joint unit. [Figure 5] 10 is an enlarged cross-sectional view of a main part showing a configuration in which a molding member that constitutes a joint unit is further provided. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, a joint unit according to one embodiment of the present invention and a building interior structure using the same will be described with reference to the drawings. Note that the embodiment shown below is specifically described to provide a better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified. Furthermore, the drawings used in the following description may show essential parts enlarged for convenience in order to make the features of the present invention easier to understand, and the dimensional proportions of each component may not necessarily be the same as in reality.

[0019] In the following description, the term "perpendicular to" means that the angle between the components may be in the range of 85° to 95°, including 90°.

[0020] [Structure of interior decorative materials] First, an interior decorative material used in the interior structure of a building according to one embodiment of the present invention will be described. FIG. 1 is a schematic cross-sectional view showing an example of an interior decorative material that constitutes the interior structure of a building according to the present invention. The interior decorative material 10 comprises at least a base layer 11 and a hydrophilic layer 13 disposed on one surface 11a of the base layer 11. A decorative layer 12 may be disposed between the base layer 11 and the hydrophilic layer 13. Furthermore, it is preferable that a heat insulating layer 15 and a thin aluminum layer 16 are disposed on the other surface 11b of the base layer 11 in this order.

[0021] (base material layer) The substrate layer 11 is a thin plate made of aluminum or an alloy containing aluminum. The thickness of the substrate layer 11 may be, for example, in the range of 0.2 mm to 0.6 mm. The surface of the substrate layer 11 may be a smooth surface such as a mirror finish, or a rough surface.

[0022] (decorative layer) The decorative layer 12, which is optionally provided, is a decorative layer formed by baking a paint containing acrylic resin or polyester resin onto one surface 11a of the base layer 11. The decorative layer 12 can be formed in any desired color and design using the paint. This allows for a design effect that matches the atmosphere of the installation location when the interior decorative material 10 is viewed from the outside through the hydrophilic layer 13. The decorative layer 12 may have a thickness in the range of 10 μm to 40 μm, for example.

[0023] (hydrophilic layer) The hydrophilic layer 13 is made of a hydrophilic material, particularly an organic hydrophilic material. As the organic hydrophilic material, a film containing a binder having a hydrophilic group is preferred from the viewpoint of preventing falling water due to condensation, etc. Preferred examples of the hydrophilic group include a sulfonic acid group or a salt thereof, a hydroxyl group, a carboxy group or a salt thereof, a poly(oxyalkylene) group, and an ammonium salt.

[0024] Specific examples of organic hydrophilic materials that constitute the hydrophilic layer 13 include a film containing a polymer of a bifunctional (meth)acrylate having a sulfonic acid group or its salt; a film containing a polymer of a vinyl monomer having an N-methylol group or an N-alkoxymethylol group, a vinyl monomer having a sulfonic acid group, and an alkyl (meth)acrylate monomer; a film containing a polymer having a hydrophilic group and an alkoxysilyl group; and the like.

[0025] The thickness of the hydrophilic layer 13 may be in the range of 1.5 μm to 100 μm, preferably in the range of 1.5 μm to 10 μm, and more preferably in the range of 2.0 μm to 5.0 μm. If the thickness of the hydrophilic layer 13 is 1.5 μm or more, the generation of water droplets due to condensation or the like can be sufficiently suppressed. If the thickness of the hydrophilic layer 13 is 100 μm or less, for example, when forming the hydrophilic layer 13 from an ultraviolet curable resin, it is easy to apply the hydrophilic layer 13 to the decorative layer 12.

[0026] Furthermore, the contact angle (wettability), which is the standard for the hydrophilicity of the hydrophilic layer 13 in the present invention, is 45° or less. The contact angle is the angle between the tangent of a droplet and the solid surface, and if the contact angle is approximately 45° or less, it is considered that hydrophilicity is exhibited in the present invention.

[0027] In addition to the hydrophilic materials described above, the hydrophilic layer 13 may further contain an antifungal agent, an antibacterial agent, an antiviral agent, a matting material, etc. By including an antifungal agent, an antibacterial agent, or an antiviral agent, it is possible to inhibit the occurrence and proliferation of mold, bacteria, and viruses caused by moisture adhering to the hydrophilic layer 13. Furthermore, by including a matting material, it is possible to suppress the shine (gloss) of the surface of the hydrophilic layer 13 and further inhibit the adhesion of grease such as fingerprints, thereby maintaining the aesthetic appearance.

[0028] It is also preferable that the surface of the hydrophilic layer 13 has a fine uneven structure (rough surface) to increase the surface area and further improve the hydrophilic function.

[0029] (insulating layer) The heat insulating layer 15, which is optionally provided, is a functional layer that imparts heat insulating properties to the interior decorative material 10 of this embodiment, and is made of foamed resin (porous resin). Examples of foamed resin that makes up the heat insulating layer 15 include foamed polyurethane, foamed polystyrene, foamed polyethylene, phenolic foam, and foamed polyvinyl chloride. In this embodiment, foamed polyurethane is used as the heat insulating layer 15.

[0030] The thickness of the insulating layer 15 may be, for example, in the range of 5.0 mm to 20 mm, preferably in the range of 7.0 mm to 10 mm. By making the thickness of the insulating layer 15 in the above range, the insulating properties required for keeping the temperature inside the food factory can be ensured and peeling of the insulating layer 15 can be prevented.

[0031] (thin aluminum layer) The thin aluminum layer 16, which is optionally provided, may be a foil or sheet made of aluminum or an alloy containing aluminum. Such a thin aluminum layer 16 protects the back side of the interior decorative material 10. The thickness of the thin aluminum layer 16 may be, for example, in the range of 0.01 mm to 0.1 mm.

[0032] (Interior decorative materials) When the above-described interior decorative material 10 is applied to the interior structure 20 of the building of this embodiment, it may be formed into a rectangular plate shape with a long side L1 of approximately 1000 mm to 4000 mm and a short side L2 of approximately 100 mm to 300 mm.

[0033] [Joint unit, building interior structure] The interior structure 20 of a building according to one embodiment of the present invention is constructed using the interior decorative material 10 having the above-described configuration. In the following description of the interior structure 20 of a building of this embodiment, an example will be given in which the interior decorative material 10 is arranged and formed at an angle as a ceiling decorative panel along the inside of the sloping ceiling of the building, i.e., the inner surface of the ceiling on the indoor side.

[0034] FIG. 2 is a schematic diagram showing the interior structure of a building equipped with a joint unit according to one embodiment of the present invention and an interior decorative material. The interior structure 20 of a building in this embodiment comprises at least a base frame 21 fixed to the inner ceiling surface W1 of the building which is inclined at an angle θ to the horizontal, a plurality of interior decorative materials 10 arranged at an incline along the inner ceiling surface W1, and a joint unit 30.

[0035] Each interior decorative material 10 used in the building interior structure 20 of this embodiment is formed, for example, so that its outer shape is a long, narrow rectangular plate. In the building interior structure 20 of this embodiment, the interior decorative materials 10 are arranged so that their long sides L1 are aligned along the inclination direction U of the ceiling inner surface W1, and their short sides L2 are aligned along the horizontal direction S perpendicular to the inclination direction U, thereby covering the ceiling inner surface W1.

[0036] FIG. 3 is an enlarged cross-sectional view of a main part showing the configuration of the joint unit. The joint unit 30 of this embodiment has a first joint material 31 fixed to a base frame 21 formed intermittently on the ceiling inner surface W1, and a second joint material 35 engaged with this first joint material 31.

[0037] Such joint units 30 are formed along the short sides L2 of the interior decorative materials 10 in an area including the gaps P at the ends of the interior decorative materials 10. Note that one joint unit 30 is formed across the short sides L2 of multiple interior decorative materials 10.

[0038] The first joint material 31 has an approximately T-shaped cross section and has a first attachment portion 32 extending along the gap P between the short sides L2 of adjacent interior decorative materials 10, and a first plate-shaped portion 33 extending from this first attachment portion 32 along one surface 10a, which is the surface of the interior decorative material 10 facing the ceiling inner surface W1.

[0039] The first plate-shaped portion 33 is fixed to the base frame 21 on the inner surface of the ceiling W1 by, for example, nails or adhesive, and thereby the entire joint unit 30 is fixed to the inclined inner surface of the ceiling W1.

[0040] The first engaging portion 32 has an engaging groove 32a formed on the inner surface with a step or other stopper, into which a second engaging portion 36 of a second joint material 35 (described later) is inserted. The first engaging portion 32 and the first plate-shaped portion 33 that constitute the first joint material 31 may be integrally molded from, for example, hard polyvinyl chloride (PVC).

[0041] Additionally, end face abutment members 34 are formed on both outer surfaces of the first fastening portion 32, respectively, to contact the end face of the short side L2 along the thickness direction of the interior decorative material 10 and receive the interior decorative material 10. These end face abutment members 34 may be made of, for example, a rubber material or elastic resin having a U-shaped cross section.

[0042] The second joint material 35 has a second attachment portion 36 extending along the gap P between the short sides L2 of adjacent interior decorative materials 10, and a second plate-shaped portion 37 extending from this second attachment portion 36 along the other surface 10b of the interior decorative material 10.

[0043] The second plate-shaped portion 37 contacts adjacent interior decorative materials 10 at the ends on the short side L2 side so as to connect the other surfaces 10b of both materials.

[0044] The second engaging portion 36 has an engaging protrusion 36a with a step or other prevention mechanism formed on its outer surface, and is inserted into the engaging groove 32a of the first engaging portion 32 of the first joint material 31. This integrates the first joint material 31 and the second joint material 35, and the end portion on the short side L2 side of the interior decorative material 10 is clamped between the first plate-shaped portion 33 and the second plate-shaped portion 37 that face each other.

[0045] The second engaging portion 36 and the second plate-shaped portion 37 that constitute the second joint material 35 may be integrally molded from, for example, hard PVC.

[0046] In this embodiment, the fastening groove 32a, which is a female fastening member, is formed on the first joint material 31, which is on the upper side during installation, and the fastening ridge 36a, which is a male fastening member, is formed on the second joint material 35, which is on the lower side. However, it is also possible to configure the first joint material 31 to have a male fastening member and the second joint material 35 to have a female fastening member.

[0047] A gutter-shaped portion 38 is integrally formed on one end 37a of the second plate-shaped portion 37 of the second joint material 35. The gutter-shaped portion 38 forms a U-shaped cross section together with the second plate-shaped portion 37, and a slit-shaped opening 38s is formed between the gutter-shaped portion 38 and the second plate-shaped portion 37 on the other end 37b of the second plate-shaped portion 37. The opening 38s opens at the end of the short side L2 of the interior decorative material 10 that is disposed above the slope direction U of the ceiling inner surface W1, of the interior decorative materials 10 adjacent to each other via the joint unit 30.

[0048] Furthermore, one end 37a and the other end 37b of the second plate-shaped portion 37 are each provided with a protrusion 39 that protrudes toward the other surface 10b of the interior decorative material 10. Such protrusion 39 may have, for example, a generally triangular cross section and be made entirely of rubber or elastic resin. When the second joint material 35 is attached to the first joint material 31, such protrusion 39 bends in contact with the end of the other surface 10b of the interior decorative material 10 disposed therebetween, thereby preventing displacement of the joint unit 30 from the mounting portion.

[0049] FIG. 4 is an enlarged cross-sectional view of a main part showing a configuration in which a joint unit connecting portion cover is further provided on the joint unit. The joint unit 30 preferably further includes a joint unit connection cover 41 .

[0050] The joint unit connection cover 41 is disposed so as to cover the connection portions (seams) between the plurality of interior decorative materials 10 arranged along a horizontal direction S perpendicular to the inclination direction U.

[0051] The joint unit connection cover 41 comprises a cover body 42 that covers the gutter-shaped portions 38 of adjacent joint units 30 from below, and claw portions 43 that are integrally formed on both ends of the cover body 42. These claw portions 43 are attached to one end and the other end of the gutter-shaped portions 38 of the second joint material 35. This allows the joint unit connection cover 41 to be tightly fastened to the second joint material 35, making the connection portions (seams) between multiple interior decorative materials 10 invisible from below.

[0052] Such joint unit connection cover 41 may be integrally molded from, for example, soft PVC. In addition, by making the joint unit connection cover 41 the same color as the second joint material 35 described above, it is possible to achieve a unified appearance.

[0053] FIG. 5 is an enlarged cross-sectional view of a main part showing a configuration in which a molding member that constitutes a joint unit is further provided. The joint unit 30 may further include a skirting member 45 .

[0054] The molding member 45 is formed so that its longitudinal direction follows the intersection of the ceiling inner surface W1 and the side wall surface of the building. More specifically, for example, it is formed on the peripheral portion of a plurality of interior decorative materials 10 arranged along the ceiling inner surface W1, for example, on the peripheral portions on all four sides when a plurality of interior decorative materials 10 are arranged in a rectangular shape.

[0055] The skirting member 45 has a clamping portion 46 and a receiving member 49 . The clamping portion 46 is a C-shaped cross-section member that clamps the end of the interior decorative material 10, and has a first plate-shaped portion 46a that is fixed to the base frame 21 and contacts one side 10a of the interior decorative material 10, and a second plate-shaped portion 46b that faces the first plate-shaped portion 46a and contacts the other side 10b of the interior decorative material 10.

[0056] The receiving member 49 is integrally formed with a water receiving portion 47 extending from the clamping portion 46 and connected to the gutter-shaped portion 38 of the second joint material 35, and a side wall abutment portion 48 that contacts the side wall surface W2 of the building that intersects with the ceiling inner surface W1.

[0057] The clamping portion 46 and the receiving member 49 that make up the molding member 45 are formed to be rotatable relative to each other. In this embodiment, the clamping portion 46 and the receiving member 49 are each formed from hard PVC, and are connected to each other by a rotating portion 51 made of soft PVC. By forming such a rotating portion 51, it becomes possible to tilt the clamping portion 46, which supports the interior decorative material 10 that is inclined at an angle greater than a right angle with respect to the side wall abutting portion 48 that contacts the side wall surface W2 extending vertically, to any angle.

[0058] Furthermore, the receiving member 49 of the molding member 45 and the gutter-shaped portion 38 of the second joint material 35 are connected so as to allow liquid, such as condensed water, to flow therethrough without leaking.

[0059] Furthermore, it is preferable that a vertical gutter 52 is further formed in the portion of the molding member 45 that is below the inclination direction U on the ceiling inner surface W1, connected to the end of the receiving member 49 and extending along the side wall surface W2.

[0060] The operation and effect of the joint unit 30 of this embodiment configured as described above and the interior structure 20 of a building using the same will be described.

[0061] The building interior structure 20 of this embodiment can be suitably applied to, for example, food factories where large amounts of water vapor are generated by cooking, etc. The water vapor generated inside such buildings, such as food factories, rises and reaches the interior decorative material 10, where condensation occurs due to the temperature difference.

[0062] When the amount of condensation thus generated exceeds the amount that can be held by the hydrophilic layer 13, it flows down the surface of the interior decorative material 10 arranged along the inclined ceiling inner surface W1 in the inclined direction U as condensed water.

[0063] Then, when the condensation reaches the end of the short side L2 of the interior decorative material 10, it flows into the gutter-shaped portion 38 from the slit-shaped opening 38s formed on the upper side in the tilt direction of the second joint material 35. As a result, the condensation that flows down along the surface of the tilted interior decorative material 10 is caught by the gutter-shaped portion 38 when it reaches the end of the interior decorative material 10 without falling downward.

[0064] When a large amount of condensation water accumulates in the gutter-shaped portion 38, the condensation flows out along the extension direction of the gutter-shaped portion 38 toward the molding member 45. By providing joint unit connection covers 41 at the joints between the joint units 30 when the condensation water flows through the gutter-shaped portion 38, the condensation water can be prevented from dropping downward from the joints between the joint units 30, and the condensation water can flow smoothly from one gutter-shaped portion 38 to the other gutter-shaped portion 38.

[0065] The condensation water flowing through each joint unit 30, which serves as a flow path for condensation water and is formed in the gaps between the ends of the interior decorative material 10, is collected in the water receiving portion 47 of the rim member 45 formed on the peripheral portion of the ceiling inner surface W1.

[0066] The condensation water that flows down from the interior decorative material 10 and is collected in the water receiving portion 47 is discharged into a drain or the like via a vertical gutter 52 formed at the end of the water receiving portion 47 in the inclined direction.

[0067] As described above, with the joint unit 30 of this embodiment and the building interior structure 20 using it, even if a large amount of condensation occurs on the inclined interior decorative materials 10 covering the ceiling inner surface W1 and the condensed water flows down the surface of the interior decorative materials 10, it is collected by the gutter-shaped portion 38 of the second joint material 35 of the joint unit 30 and further passes through the water receiving portion 47 of the molding member 45 and is discharged into a drain or the like. Therefore, even in a high-humidity environment, water vapor can be prevented from condensing into droplets and falling downward. As a result, if applied to, for example, a food factory, which is an example of a building, food contamination due to water droplets falling on the food can be prevented and indoor comfort can be increased.

[0068] In this embodiment, the extension direction of the joint unit 30 is set along the horizontal direction S that is perpendicular to the inclination direction U, but the extension direction of the joint unit 30 can also be arranged so as to be inclined in a direction that is more inclined than the horizontal direction S. In this case, condensation water flowing through the gutter-shaped portion 38 of the second joint material 35 can be made to flow more smoothly toward the molding member 45.

[0069] Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. In the above-described embodiments, installation on the ceiling inner surface W1 was described, but installation on the side wall surface W2 as well, or installation on the side wall surface W2 alone, is also possible. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are within the scope and spirit of the invention, as well as the scope of the invention and its equivalents as set forth in the claims. [Explanation of symbols]

[0070] 10...Interior decorative materials 11...Base material layer 12...Decorative layer 13…Hydrophilic layer 14...Buffer layer 15...Insulating layer 16...Aluminum thin layer 20...Interior structure of building 21...Base frame 30...Joint unit 31...First joint material 32...First attachment point 33...First plate-shaped portion 34...End face abutment member 35...Second joint material 36...Second attachment part 37...Second plate-shaped portion 38...Gutter-shaped part 38s…opening 39…Protrusion portion 41...Joint unit connection cover 42...Cover body 45...Side fittings 46...Holding part 47...Water receiving part 49...Receiving member W1: Inside of ceiling

Claims

1. A joint unit that is arranged in an area including gaps between ends of a plurality of interior decorative materials that are arranged at an angle with respect to a horizontal plane on the inner surface of a ceiling of a building, The joint unit includes a first joint material fixed to a base material formed on the inner surface of the ceiling, and a second joint material attached to the first joint material, The first joint material has a first engaging portion extending along the gap and a first plate-shaped portion extending from the first engaging portion along one surface of the interior decorative material that is on the ceiling inner surface side, The second joint material is a joint unit having a second attachment portion that extends along the gap and engages with the first attachment portion, a second plate-shaped portion that extends from the second attachment portion along the other side of the interior decorative material, and a gutter-shaped portion that is connected to one end of the second plate-shaped portion and forms a slit-shaped opening between it and the second plate-shaped portion at the other end of the second plate-shaped portion that is above the slope of the inner ceiling surface.

2. 2. The joint unit according to claim 1, wherein one end and the other end of the second plate-shaped portion are provided with a protrusion made of an elastic material and protruding toward the other surface of the interior decorative material.

3. The joint unit according to claim 1 or 2, further comprising a joint unit connection cover formed between adjacent joint units at the connection portions between the plurality of joint units and covering each of the trough-shaped portions.

4. The joint unit further includes a molding member formed at an end of the interior decorative material, 3. The joint unit according to claim 1, wherein the molding member has a clamping portion with a U-shaped cross section that clamps the end of the interior decorative material, a water receiving portion that extends from the clamping portion and is connected to the gutter-shaped portion of the second joint material, and a side wall abutment portion that contacts the side wall surface of the building that intersects with the inner surface of the ceiling.

5. The joint unit according to claim 4, wherein the clamping portion and the receiving member of the molding member are formed so as to be rotatable or bendable relative to each other.

6. An interior structure of a building, comprising the joint unit according to claim 4 and the interior decorative material, wherein a plurality of the interior decorative materials are arranged along the inclined inner surface of the ceiling of the building, The interior decorative material has a rectangular plate-like outer shape and is arranged so that its longitudinal direction follows the inclination direction of the ceiling inner surface, The second joint material of the joint unit is formed across the ends of the plurality of interior decorative materials so that the longitudinal direction thereof is perpendicular to the inclination direction, The molding member is formed so that its longitudinal direction follows the intersection of the ceiling inner surface and the side wall surface of the building, An interior structure of a building, wherein the gutter-shaped portion of the second joint material and the water receiving portion of the molding member are connected to allow liquid to flow therethrough.

7. The interior structure of a building according to claim 6, wherein a vertical gutter connected to an end of the water receiving portion and extending along the side wall surface is further formed on the lower side of the molding member in the inclined direction.

8. 7. The interior structure of a building according to claim 6, wherein the interior decorative material has at least a base layer containing aluminum, and a hydrophilic layer containing a hydrophilic resin and having a thickness of 1.5 μm or more and 100 μm or less, which is disposed on one side of the base layer.

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