suspended ceiling

Abstract

To provide a hung ceiling which does not damage an appearance in an indoor space and which can prevent fall of a ceiling material by suppressing swing in an earthquake.SOLUTION: A hung ceiling comprises: a plurality of module plates in which a ceiling face is divided into arbitrary face shapes having a center of gravity in the face; and a hanging wire hanging the module plates from a structure skeleton of a building. At least one-point of the center of gravity of the module plate is hung by the hanging wire. A hanging length of the hanging wire is adjusted to be set such that a natural period of the module plate does not match a natural period of the structure skeleton, to avoid resonance with the building.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] This invention relates to a suspended ceiling that prevents ceiling materials from falling during an earthquake. [Background technology]

[0002] BACKGROUND ART Conventionally, as a means for preventing ceiling materials of a suspended ceiling from falling, nets or wires have been stretched below the ceiling surface (Patent Documents 1 to 3).

[0003] On the other hand, Patent Document 4 discloses a suspended ceiling with sound absorbing and acoustic reflecting functions to obtain an acoustic effect when a music concert is held in an indoor sports facility or the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2020-94408 [Patent Document 2] Japanese Patent Publication No. 2020-41422 [Patent Document 3] Japanese Patent Application Laid-Open No. 2016-169492 [Patent Document 4] Japanese Patent Application Publication No. 10-273950 Summary of the Invention [Problem to be solved by the invention]

[0005] The nets or wires stretched below the ceiling surface as in Patent Documents 1 to 3 are intended to catch ceiling materials, etc., in the process of falling, but are not intended to prevent the ceiling materials, etc., from falling. Moreover, not only must they have sufficient structural strength to withstand the weight of the ceiling materials, etc., as well as the impact force when they fall, but they also spoil the aesthetics of the indoor space after installation.

[0006] On the other hand, Figure 1 of Patent Document 4 discloses a structure in which a number of ceiling panel pieces 3 are each suspended by a suspension member (lifting device 8). Each ceiling panel piece 3 has a uniform thickness, and the suspension member is attached at a position off-center of the ceiling panel piece 3, but in the figure, the ceiling panel pieces 3 are suspended horizontally in an unnatural state. In any case, the figure does not disclose that each ceiling panel piece 3 is suspended at a single point at its center of gravity.

[0007] In contrast, Figure 3 of Patent Document 4 is positioned as prior art and shows a full-length suspended ceiling in which a single huge ceiling panel is suspended by numerous suspension members. The suspended ceiling in this figure has ceiling panels that amount to tens of thousands of square meters, so it is said that the building structure needs to be extremely robust. When viewed from the ceiling panel side, the position at which the suspension member is attached is also important, and the optimal position must be calculated taking into account the shape and rigidity of the entire ceiling panel. Calculating the attachment position of the suspension member becomes particularly difficult when the ceiling panel has a complex shape, such as an asymmetrical shape.

[0008] Furthermore, if a suspended ceiling resonates with the structural frame during an earthquake, the shaking of the suspended ceiling will be amplified, placing a large load on the hanging materials, and there is also the risk that the ceiling panels will shake violently and collide with walls, etc., but Patent Document 4 does not disclose any means for suppressing the shaking of the suspended ceiling from this perspective.

[0009] The present invention has been made to solve the above-mentioned problems, and its purpose is to disclose a suspended ceiling that does not impair the aesthetic appearance of the indoor space and can prevent the ceiling material from falling by suppressing shaking during an earthquake. [Means for solving the problem]

[0010] In order to achieve the above-mentioned objective, the present invention uses a means in which a ceiling surface is divided into a plurality of modular plates having arbitrary surface shapes with centers of gravity within the surface, and suspension wires for suspending each of the modular plates from the structural body of the building, and at least one point of the center of gravity of the modular plate is suspended by the suspension wires.

[0011] According to the above-mentioned method, the attachment position (lower fixing position) of the suspension wire relative to the module board is set as the center of gravity, so the module board can be suspended stably regardless of its shape. The finished product is also satisfactory, as long as the fasteners for the suspension wire are exposed to a certain extent on the underside of the module board. Furthermore, because the module board is suspended directly by the suspension wire, there is no need for ceiling support members such as joists and joist supports, as in the past, resulting in a lightweight suspended ceiling.

[0012] In addition, by setting the suspension length of the suspension wire from the upper fixed point to the lower fixed point to a length that does not match the natural period of the module plate with the natural period of the structural body, it is possible to prevent the module plate from resonating with the building during an earthquake and suppress the shaking of the module plate.

[0013] Furthermore, the means for varying the suspension length of the suspension wire makes it possible to change the natural period of the module plate as appropriate, so that the natural period of the module plate can be easily set to a value that does not match the natural period of the building, depending on the building.

[0014] In addition, by standardizing the hanging length of the suspension wires for all module boards, all module boards will basically exhibit the same sway, preventing interference with each other, and the natural periods of all module boards can be standardized to values ​​that do not match the natural period of the building.

[0015] Furthermore, even if the system includes a unit plate formed by connecting adjacent module plates and at least one point of the center of gravity of the unit plate is suspended by the suspension wire, stable suspension and a good finish can be achieved, just like with a module plate suspended alone.

[0016] On the other hand, by forming the surface of the module board facing the room with an acoustically reflective material, it is possible to construct a suspended ceiling having an acoustically reflective effect.

[0017] Depending on the shape and size of the module boards or unit boards, additional suspension wires may be attached to points other than the center of gravity, for example, so that each is suspended from three points. In this case, the effectiveness of preventing the ceiling from falling is increased by the number of additional suspension wires compared to suspension from a single point at the center of gravity, and even with three-point suspension, the natural period can be made the same as with suspension from a single point at the center of gravity by unifying the suspension lengths of all suspension wires. [Effects of the Invention]

[0018] According to the present invention, it is possible to provide a suspended ceiling that has a good finish without impairing the aesthetic appearance of the indoor space, is lighter than conventional suspended ceilings and therefore puts less strain on the suspension wires and structural frame, and moreover, easily avoids resonance with the building. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view showing a ceiling surface of a suspended ceiling according to an embodiment of the present invention; [Figure 2] Cross-sectional view [Figure 3] Enlarged cross-sectional view of the module board [Figure 4] 1, perspective view [Figure 5] 10A and 10B are plan views showing other examples of module board shapes; [Figure 6] FIG. 1 is a cross-sectional view showing another embodiment of the present invention. [Figure 7] FIG. 10 is a side view showing yet another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Figures 1 and 2 are perspective and cross-sectional views showing an entire suspended ceiling according to one embodiment of the present invention, in which the ceiling surface CF is composed of a collection of multiple modular plates 1. That is, in this embodiment, the ceiling surface CF is divided into a lattice pattern, and multiple modular plates 1 each having a rectangular surface shape are provided. These modular plates 1 are then suspended from the structural frame 3 of a building by suspension wires 2.

[0021] Because each module board 1 is suspended directly from the structural frame 3 via a suspension wire 2 without relying on a joist or other support, each module board 1 is independent of the others. In this invention, as shown in Figures 3 and 4, a suspension bracket 4 is attached to the center of gravity CG of a module board 1 of uniform thickness, and the lower end of the suspension wire 2 is fixed to this suspension bracket 4, with the upper end fastened to the structural frame 3. By suspending the module board 1 from a single point at the center of gravity CG in this way, each module board 1 is suspended horizontally. Furthermore, by standardizing the suspension length of all module boards 1 using the suspension brackets 4, a uniform ceiling surface CF can be formed, as if it were a single piece of material. Therefore, the suspended ceiling of this invention does not detract from the aesthetic appearance of the indoor space.

[0022] In this embodiment, since the hanging hardware 4 is attached to the module board 1 side, the hanging hardware 4 may be exposed on the underside of the module board 1, but since its size is small and it can be concealed with a sticker or the like, it does not significantly affect the aesthetic appearance of the indoor space.

[0023] Furthermore, the surface shape of the module board 1 can be determined arbitrarily, and can be selected from a variety of shapes, such as a rectangle (a), a triangle (b), an oval (c), a regular hexagon (d), and an L-shape (e), as shown in Figure 5. However, whichever surface shape is selected, the center of gravity CG must be within the plane. This is because a board with a center of gravity outside the plane cannot be suspended horizontally using a single point suspension.

[0024] In the suspended ceiling of the present invention, the natural period of the module board 1 is determined by the suspension length of the suspension wires 2. Therefore, by adjusting the suspension length, the natural period of the module board 1 can be set so that it does not match the natural period of the building's structural frame 3. By setting the natural period of the module board 1 so that it does not match the natural period of the structural frame 3 in this way, it is possible to prevent the module board 1 from resonating with the structural frame 3 during an earthquake, and the shaking of the module board 1 is suppressed. As a result, the load on the suspension wires 2 and the structural frame 3 is reduced, and the module board 1 is prevented from colliding with walls, etc., thereby reducing the risk of the ceiling collapsing. Furthermore, by standardizing the suspension length of each module board 1, the natural period of all module boards 1 also becomes the same, and therefore all module boards 1 will exhibit the same shaking during an earthquake, thereby suppressing mutual interference and collision.

[0025] Furthermore, setting the suspension length of the module panel 1 as long as the building will allow is advantageous in avoiding resonance with the building. This is because a longer suspension length also lengthens the natural period of the module panel 1, and even if the building, which has a smaller natural period, vibrates horizontally, the vibration of the module panel 1 can be almost completely eliminated. In this regard, it is preferable to provide an acoustically reflective material on the indoor surface of the module panel 1 and apply the suspended ceiling of the present invention to the acoustically reflective structure of a multipurpose hall.

[0026] 6 shows another embodiment of the present invention, in which (a) there is one upper fixed point on the structural body 3 side, while (b) there are three upper fixed points. In this case, in (a), the module plate 1 performs pendulum motion with the upper fixed point 5 as the fulcrum, but in (b), the upper fixed point 5 is restrained from swinging at three points, so the connecting point 6 of the three points becomes the actual upper fixed point, and the module plate 1 performs pendulum motion with this as the fulcrum. Therefore, when adjusting the suspension length L to set the natural period of the module plate 1, in (a) the length from the upper fixed point 5 to the lower fixed point 7 on the module plate 1 side is adjusted, while in (b) the length from the connecting point 6 to the lower fixed point 7 is adjusted.

[0027] In this way, in the present invention, the module board 1 is suspended at a single point at the center of gravity, but the means for fastening the suspension wire 2 to the structural body 3 does not have to be at a single point. Even when the suspension wire 2 is supported at three points on the structural body 3, as shown in Figure 6(b), the natural period of the module board 1 can be changed by appropriately adjusting the length from the connecting point 6 to the lower fixed point 7 as the suspension length L. Although the ceiling surface heights of (a) and (b) are different, the suspension length L is the same, so the natural periods of the module boards 1 in both cases match.

[0028] Figure 7 shows yet another embodiment of the present invention. The previous embodiments used flat modular panels 1 with a uniform thickness, allowing for the construction of flat ceilings, but this embodiment uses modular panels 10 that are mountain-shaped when viewed from the side, making it possible to construct suspended ceilings such as boat-shaped ceilings and roof-shaped ceilings.

[0029] In addition, in this embodiment, the center of gravity CG of the module board 10 is still suspended by the suspension wire 2, but two more suspension wires 2' are added at symmetrical positions to more firmly prevent the module board 10 from falling.

[0030] Furthermore, the hanging length L of all three hoisting wires 2 and 2' can be changed at any time by a winding device 11 or the like. The natural period is set based on the hanging length L of the hoisting wire 2 attached to the center of gravity CG, and the other two wires are also set to the same hanging length L, thereby maintaining the set natural period.

[0031] In this invention, the ceiling surface is divided into multiple modular plates, making it easy to calculate the center of gravity where the suspension wires are attached. The manner in which the ceiling surface is divided, i.e., the size and shape of the modular plates, can be determined arbitrarily. In this regard, it is also possible to connect adjacent modular plates to form a modular plate and suspend the modular plate from its center of gravity with suspension wires. This approach offers the advantages of enabling the construction of a ceiling surface that would be impossible with a single modular plate, as well as shortening the installation time since fewer suspension wires are required than if each modular plate were suspended individually. [Explanation of symbols]

[0032] CF ceiling surface CG center of gravity 1 module board 2 Lifting wire 3 Structural frame 4 Hanging hardware 5 Upper fixed point 7 Lower fixing point L hanging length

Claims

1. A suspended ceiling comprising a plurality of modular panels that divide the ceiling surface into arbitrary surface shapes each having a center of gravity within the surface, and suspension wires that suspend each of the modular panels from the structural body of a building, wherein only one point of the center of gravity of each modular panel is suspended by the suspension wires.

2. 2. The suspended ceiling according to claim 1, wherein the suspension length from the upper fixed point to the lower fixed point of the suspension wire is set to a length such that the natural period of the module board does not coincide with the natural period of the structural frame.

3. 3. A suspended ceiling according to claim 1 or 2, wherein the suspension length of the suspension wire is variable.

4. 3. A suspended ceiling according to claim 1 or 2, wherein the suspension lengths of the suspension wires are uniform for all module boards.

5. 5. The suspended ceiling according to claim 1, further comprising a unit plate formed by connecting adjacent modular plates, the unit plate being suspended by the suspension wires at only one point on the center of gravity.

6. 6. A suspended ceiling according to claim 1, wherein the surfaces of the module panels facing the interior of the room are made of an acoustically reflective material.

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