Ceiling material

Abstract

To provide ceiling material capable of making appearance of joints of a ceiling surface good even when material with relatively small and light specific gravity is used.SOLUTION: Ceiling material made of a material sheet 1 in a specific shape including a paper board as material and attached on a frame body 2 supported on an upper structure of a building skeleton is provided with a main board part 10, a cylindrical part 20, and an engagement part 30. The main board part 10 is a part facing a floor. The cylindrical part 20 is formed along an outer periphery of the main board part 10 so as to fold a peripheral edge part of the material sheet 1 inward. The engagement part 30 is placed on the cylindrical part 20 to engage with the frame body 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ceiling material, and more particularly to a ceiling material as a finishing material that is supported on a frame that serves as a base for a suspended ceiling. [Background technology]

[0002] As a ceiling structure for a suspended ceiling, Patent Document 1 describes a ceiling structure in which a frame is suspended from the upper structure of a building skeleton, and ceiling materials (ceiling panels) are supported by the frame to form a ceiling surface. According to the ceiling structure described in Patent Document 1, a predetermined number of rectangular ceiling materials are attached to the frame so that they are lined up vertically and horizontally, making it possible to form ceiling surfaces of various sizes and shapes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-31707 Summary of the Invention [Problem to be solved by the invention]

[0004] Currently, according to the Building Standards Act Enforcement Ordinance, stricter technical standards are applied to "specified ceilings" to prevent them from falling or collapsing during earthquakes, etc. One of the requirements for a "specified ceiling" is that "the mass per unit area of ​​the ceiling surface components exceeds 2 kg / m2," and reducing the mass per unit area of ​​ceiling materials is extremely effective in reducing the risk of ceiling materials falling.

[0005] When reducing the unit area mass of a ceiling material, there is a limit to how much the thickness of the material board can be reduced, so it is effective to use a material with as low a specific gravity and as light as possible as the material for the ceiling material. However, materials with a relatively low specific gravity and light weight generally have large irregularities on the edge surfaces, and when rectangular ceiling materials are lined up vertically and horizontally to form a ceiling surface, there is a problem in that the appearance of the joints is not good.

[0006] The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a ceiling material that can improve the appearance of the joints on the ceiling surface even if a light material with a relatively low specific gravity is used as the material. [Means for solving the problem]

[0007] The ceiling material disclosed in the present application is formed from a material sheet (1) of a predetermined shape containing paperboard as a material, and is attached to a frame (2) supported on the superstructure of a building skeleton, and comprises a main board portion (10), a tubular portion (20), and an engaging portion (30). The main board portion (10) is the portion that faces the floor. The tubular portion (20) is formed along the outer periphery of the main board portion (10) by folding the peripheral edge of the material sheet (1) inward. The engaging portion (30) is attached to the tubular portion (20) and engages with the frame (2).

[0008] In the ceiling material disclosed in the present application, the engaging portion (30) includes a pair of arms (31) of a torsion coil spring. The pair of arms (31) extend from the inside to the outside of the cylindrical portion (20) so as to be engageable with an engaged hole (2a) formed in the frame body (2) in a state in which the tips of the arms (31) are biased so as to move away from each other around the coil axis (I) of the torsion coil spring.

[0009] In the ceiling material disclosed in the present application, the material sheet (1) includes a corrugated cardboard sheet formed from the paperboard and a metal foil plate attached to the corrugated cardboard sheet, and the paperboard contains 2 to 80 mass % of inorganic fibers. [Effects of the Invention]

[0010] According to the ceiling material of the present invention, even if a light material with a relatively low specific gravity is used as the material, the appearance of the joints on the ceiling surface can be improved. [Brief explanation of the drawings]

[0011] [Figure 1]1 is an external perspective view showing a ceiling material according to an embodiment of the present invention; [Figure 2] FIG. 2 is a plan view showing a material sheet for the ceiling material of FIG. 1. [Figure 3] FIG. 2 is an external perspective view showing a frame to which the ceiling material of FIG. 1 is attached. [Figure 4] 4 is an external perspective view showing the state in which the ceiling material of FIG. 1 is attached to the frame of FIG. 3. FIG. [Figure 5] 2 is a partially enlarged view showing how an engaging portion of the ceiling material in FIG. 1 engages with a frame body. [Figure 6] 1 is a cross-sectional view showing an example of a material for a material sheet used in the ceiling material of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] The ceiling material according to the embodiment of the present invention will be described in detail below with reference to the drawings. Note that the embodiment described below is a preferred example for carrying out the present invention, and therefore various technical limitations are imposed thereon. However, the present invention is not limited to this embodiment unless otherwise specified in the following description to the effect that the invention is limited thereto.

[0013] <Embodiment> Below, a ceiling material according to an embodiment of the present invention will be described with reference to Figs. 1 to 5. Fig. 1 is an external perspective view showing a ceiling material according to an embodiment of the present invention. Fig. 2 is a plan view showing a material sheet of the ceiling material of Fig. 1. Fig. 3 is an external perspective view showing a frame to which the ceiling material of Fig. 1 is attached. Fig. 4 is an external perspective view showing the ceiling material of Fig. 1 attached to the frame of Fig. 3. Fig. 5 is a partially enlarged view showing the engaging portion of the ceiling material of Fig. 1 engaging with the frame.

[0014] 1 and 2, the ceiling material of the embodiment is formed from a material sheet 1 of a predetermined shape that contains paperboard as a raw material, and includes a main board portion 10 that faces the floor, a tubular portion 20, and an engagement portion 30. In the embodiment, the material sheet 1 includes a corrugated cardboard sheet formed from paperboard.

[0015] The ceiling material of this embodiment is attached to a frame 2 as shown in Fig. 3. The frame 2 is lattice-shaped in a shape corresponding to the main board portion 10, and is supported on the upper structure of the building skeleton (not shown) via hanging members 3 such as hanging bolts. The frame 2 is also formed with engaged holes 2a, which are elongated through-holes that engage with the engaging portions 30.

[0016] In this embodiment, the main board portion 10 is rectangular, and the ceiling surface is formed by arranging the main board portions 10 vertically and horizontally. To enhance the design of the ceiling surface, the material sheet 1 may be printed with a wood grain or marble pattern, or a decorative sheet may be attached. Furthermore, to improve the sound absorption properties of the ceiling, at least the main board portion 10 of the material sheet 1 may be formed with a predetermined number of pores per unit area, each having a diameter of, for example, about 0.8 to 1.2 mm.

[0017] The tubular portion 20 is formed by folding the peripheral edge of the material sheet 1 inward along the outer periphery of the main plate portion 10. As shown in Fig. 2, the material sheet 1 of this embodiment is formed by extending a plate piece of a predetermined shape along four folds L1, L2, L3, and L4 so that the tubular portion 20 can be formed along the four sides of the outer periphery of the rectangular main plate portion 10. In this embodiment, the tubular portion 20 has a square tube shape and a rectangular cross-sectional shape.

[0018] An insertion piece T1 and an insertion slit S2 are also formed in the material sheet 1. The insertion piece T1 is inserted into the insertion slit S2 when the peripheral edge of the material sheet 1 is folded to form the tubular portion 20. By inserting the insertion piece T1 into the insertion slit S2, the shape of the tubular portion 20 can be maintained without using any adhesive or the like.

[0019] The engaging portion 30 is provided in the cylindrical portion 20 and engages with the frame 2. In this embodiment, the engaging portion 30 includes a pair of arms 31 of a torsion coil spring. The material sheet 1 is formed with four H-shaped insertion slits S1 for passing the pair of arms 31 therethrough, one set at each of four locations corresponding to the four sides of the outer periphery of the main plate portion 10.

[0020] In the embodiment, the cylindrical portions 20 on which the engaging portions 30 are installed are only a pair of opposing cylindrical portions 20 out of the four cylindrical portions 20 corresponding to the four sides of the outer periphery of the main plate portion 10. Therefore, in the embodiment, only two engaging portions 30 as shown by the solid lines in Fig. 1 may be installed on a pair of cylindrical portions 20, or only two engaging portions 30 as shown by the imaginary lines (dotted lines) in Fig. 1 may be installed on another pair of cylindrical portions 20 depending on the specific situation of the location where the ceiling material is installed. It is also possible to install all four engaging portions 30 on the four cylindrical portions 20.

[0021] 4 and 5 , the pair of arms 31 extend from the inside to the outside of the cylindrical portion 20 so as to be able to engage with the engaged holes 2a of the frame body 2 in a state where the tips of the arms 31 are biased so as to move away from each other about the coil axis I of the coil portion 32 of the torsion coil spring. More specifically, the coil portion 32 of the torsion coil spring is housed inside the cylindrical portion 20, and the pair of arms 31 extending from the coil portion 32 are inserted into a pair of insertion holes 41 of a square piece-shaped reinforcing member 40 made of paperboard, and further inserted into insertion slits S1 of the cylindrical portion 20, and extend upward from the top surface of the cylindrical portion 20.

[0022] 1 to 5, according to the ceiling material of the embodiment, the peripheral edge of the material sheet 1 is folded inward along the outer periphery of the main board portion 10 to form the tubular portion 20, so that the end face of the material (in this embodiment, a cardboard sheet) forming the material sheet 1 does not appear as the end face of the main board portion 10, improving the appearance of the joints on the ceiling surface formed by arranging the main board portions 10, and even if a material with a relatively low specific gravity and light weight is used as the material, the appearance of the joints on the ceiling surface can be improved. Furthermore, using a material with a relatively low specific gravity and light weight as the material reduces the risk of injury to people even if the ceiling material falls from the ceiling due to an earthquake, etc.

[0023] Furthermore, by installing the engaging portion 30 on the tubular portion 20, there is no need to provide a connecting portion with the engaging portion 30 on the main board portion 10. For example, even when the material sheet 1 is formed from a single cardboard sheet, the engaging portion 30 can be installed so that the connecting portion with the engaging portion 30 does not appear on the surface of the main board portion 10 facing the floor, thereby making it possible to maximize the weight of the ceiling material while improving the appearance of the ceiling surface.

[0024] Furthermore, according to the ceiling material of the embodiment, the tubular portion 20 is formed along the four sides of the rectangular main board portion 10, so that when the ceiling materials are arranged vertically and horizontally to form a ceiling surface, the appearance of both the vertical and horizontal joints can be improved, and the appearance of the ceiling surface can also be improved.

[0025] 1 to 5, according to the ceiling material of the embodiment, the engaging portion 30 includes a pair of arms 31 of a torsion coil spring, and the pair of arms 31 extend from the inside to the outside of the tubular portion 20 so as to be able to engage with the engaged holes 2a of the frame body 2 with their tips biased so as to move away from each other around the coil axis I. Therefore, by simply passing the pair of arms 31 through the engaged holes 2a, the biasing force of the torsion coil spring moves the ceiling material so that the tubular portion 20 and the frame body 2 naturally come into close contact with each other, and the ceiling material can be easily and reliably attached to the frame body 2.

[0026] Furthermore, according to the ceiling material of the embodiment, the engaging portion 30 engages with the frame body 2 by the elastic force of the spring, so that even if the lattice-shaped frame body 2 is deformed by an earthquake or the like, the effects of the deformation can be absorbed and the ceiling material can be held on the frame body 2 to prevent it from falling off, further increasing safety.

[0027] Furthermore, according to the ceiling material of the embodiment, the tubular portion 20 can be formed simply by folding the peripheral portion of the material sheet 1 inward and inserting the insertion piece T1 into the insertion slit S2, and when forming the tubular portion 20, the coil portion 32 of the torsion coil spring can be stored inside the tubular portion 20, and the ceiling material can be assembled from the material sheet 1 simply by inserting the pair of arm portions 31 into the insertion slit S1, etc.

[0028] Therefore, by transporting the material sheets 1 to the construction site as they are, rather than assembling the ceiling material at a manufacturing factory, and then assembling them into the ceiling material, the volume required for transportation can be significantly reduced. For example, in the prototype of the embodiment, the thickness after assembly into the ceiling material is approximately 33 mm, and the thickness of the material sheets 1 is approximately 5 mm. Even though the ceiling material has a smaller area than the material sheets 1, the volume of the ceiling material when stacked and transported is 3.8 times or more that of the material sheets 1, and by transporting the material sheets 1 as they are, transportation to the construction site can be made extremely easy.

[0029] Next, a preferred example of a material sheet used in the ceiling material of the present invention will be described with reference to Fig. 6. Fig. 6 is a cross-sectional view showing an example of a material for the material sheet used in the ceiling material of the present invention.

[0030] As shown in Figure 6, the material sheet 1 of this embodiment is formed from a material including a corrugated cardboard sheet formed from a corrugated sheet 1a and a pair of liners 1b, and a metal foil plate 1c. The corrugated sheet 1a and the pair of liners 1b are formed from paperboard containing inorganic fibers. The metal foil plate 1c is formed from, for example, aluminum foil and is attached to the corrugated cardboard sheet so as to cover the liner 1b on the side opposite the surface facing the floor of the main board portion 10.

[0031] The cardboard used as the material for corrugated cardboard sheets is preferably made by blending inorganic fibers such as glass fibers and binding them with a binder. Specifically, it is preferable that the cardboard contains 2 to 80% by mass of inorganic fibers and is blended with a binder to improve the strength between the fibers during manufacturing. Examples of inorganic fibers included in the cardboard include glass fibers, rock wool fibers, ceramic fibers, and glass wool. More specifically, the cardboard used as the material for corrugated cardboard sheets preferably contains an organic composition of 43 to 48% by mass of kraft pulp, 8 to 10% by mass of PVA resin, 1 to 3% by mass of acrylic adhesive, and 1 to 2% by mass of flame retardant, and an inorganic composition of 33 to 39% by mass of glass fibers and 5 to 8% by mass of aluminum silicate, with a density of approximately 102 g / m3.

[0032] As explained above with reference to Figure 6, according to the ceiling material of the embodiment, the material forming the material sheet 1 includes a cardboard sheet made of paperboard containing 2 to 80 mass% inorganic fiber and a metal foil plate 1c, which makes it possible to prevent the ceiling material from catching fire and improve the fire resistance of the ceiling.

[0033] The embodiments of the present invention have been described above with reference to the drawings (FIGS. 1 to 6). However, the present invention is not limited to the above embodiments, and can be embodied in various forms without departing from the spirit of the present invention (for example, (1) below).

[0034] (1) In the above embodiment, the cross-sectional shape of the tubular portion 20 is rectangular, but this is not limited thereto, and the cross-sectional shape of the tubular portion 20 may be triangular, a polygon with pentagons or more sides, a circle, etc. However, making the cross-sectional shape of the tubular portion 20 rectangular is preferable because it makes the tubular portion 20 less likely to deform in the vertical direction, makes the ceiling surface flush, improves the appearance of the ceiling surface, and also improves the storability of the coil portion 32 of the torsion coil spring. [Explanation of symbols]

[0035] 1...Material sheet 1a, 1b...Cardboard sheet 1c…Metal foil plate 2…Frame body 2a…Engaged hole 10…Main plate part 20...Cylindrical part 30...Engagement portion 31...Arm

Claims

1. A ceiling material formed from a material sheet (1) of a predetermined shape containing paperboard as a material, and attached to a frame (2) supported on the upper structure of a building skeleton, a main plate portion (10) facing the floor; a cylindrical portion (20) formed along the outer periphery of the main plate portion (10) by folding the peripheral edge portion of the material sheet (1) inward; An engagement portion (30) that is installed on the cylindrical portion (20) and engages with the frame body (2). A ceiling material comprising:

2. The ceiling material described in claim 1, wherein the engaging portion (30) is a pair of arms (31) of a torsion coil spring, and includes a pair of arms (31) extending from the inside to the outside of the tubular portion (20) so as to be able to engage with an engaging hole (2a) formed in the frame body (2) when the tips of the torsion coil spring are biased so as to move away from each other around the coil axis (I) of the torsion coil spring.

3. The material sheet (1) includes a cardboard sheet formed from the paperboard and a metal foil plate attached to the cardboard sheet, and the paperboard contains 2 to 80% by mass of inorganic fibers. The ceiling material according to claim 1 or 2.

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