Lightweight suspended ceiling structure

Abstract

To provide a suspended ceiling face formed of various designs, while avoiding to be a specific ceiling.SOLUTION: Double ceiling joists 21 and single ceiling joists 22 are combined and fitted with prescribed spaces and arranged to form a light-weight louver ceiling 12, as ceiling decorative materials 20 covering a ceiling face 11 forming a light-weight suspended ceiling structure 10. The double ceiling joists 21 are arranged to cover the entire ceiling face 11, with prescribed adjacent spaces in the longitudinal direction of the ceiling face 11. The single ceiling joists 22 are adjusted in length to form prescribed geometric shapes, and are arranged between adjacent double ceiling joists 21. Thus, the prescribed geometric shapes are formed and arranged in the ceiling face 11 covered with the double ceiling joists 21.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to a lightweight suspended ceiling structure, and more particularly to a lightweight suspended ceiling structure that can achieve high design flexibility by avoiding specific ceiling types. [Background technology]

[0002] It is a suspended ceiling, with a height exceeding 6m and a horizontal projection area of ​​200m². 2 The mass of the components that make up the ceiling surface is 2 kg / m 2 Ceilings that fall under any of the above categories and are installed in places where people regularly enter are classified as "specified ceilings" under the Building Standards Act. Specified ceilings are subject to confirmation applications, and the notification (Ministry of Land, Infrastructure, Transport and Tourism Notification No. 771 of 2013) sets out three criteria: (1) specification route, (2) calculation route, and (3) ministerial certification route, and one of these criteria must be met.

[0003] Regardless of the route taken, the strength of the ceiling substrate must be greater than that of a typical suspended ceiling, which increases costs and prolongs the application process. This applies not only to ceilings made of surface materials such as boards, but also to linear decorative materials such as louvers. In other words, when calculating the ceiling area, the area including not only the area of ​​the louvers themselves but also the gaps between the louvers must be 200m². 2 If it exceeds a certain limit, it will be treated as a specific ceiling.

[0004] To avoid the need for specific ceilings, the design must be excluded from the requirements mentioned above, but generally the following countermeasures are employed. (1) Construction method that does not use a suspended ceiling: The ceiling material is attached directly to the main steel frame, or a trellis steel frame is installed and the ceiling material is attached directly to that steel frame. This method avoids the requirement of a specific ceiling as it is a semi-structural seismic-resistant ceiling. (2) The mass of the ceiling material should be 2 kg / m 2 The following construction method is used: non-combustible membrane material, non-woven fabric panel, or other lightweight ceiling board (Patent Document 1).

[0005] In the lightweight suspended ceiling structure disclosed in Patent Document 1, the ceiling board is 0.88 kg / m 2 Inorganic, non-combustible foam insulation boards are used, and the unit area mass of the suspended ceiling is 1.87 kg / m². 2 This results in 2.0 kg / m 2 The following are described as being achievable. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Utility Model Registration No. 3210534 Publication [Overview of the project] [Problems that the invention aims to solve]

[0007] The methods described above for avoiding specific ceilings have the following problems: (1) In order to construct the trellis steel frame that constitutes the semi-structural earthquake-resistant ceiling, construction costs and construction period will increase. Also, since the trellis steel frame is manufactured in advance in a factory or similar facility in a predetermined shape, it is difficult to flexibly accommodate changes to the ceiling design. (2) Due to limitations in the anchoring structure of the membrane material, there are limited design variations, and differentiation is difficult as there are many examples of its use in existing facilities. Construction costs will also increase. In the lightweight suspended ceiling structure described in Patent Document 1, it is necessary to paint the ceiling boards after the installation work of the normal ceiling boards, which may increase construction costs and lengthen the construction period.

[0008] When designing a louvered ceiling instead of lightweight ceiling boards, square pipes made of common aluminum extruded profiles are often used as louvers. However, among the requirements for avoiding specific ceiling designations, the amount of ceiling material must be 2.0 kg / m 2 In order to satisfy the following conditions, the spacing between the louvers needs to be quite wide, which results in a problem where, when viewed from below, the ceiling surface becomes almost a skeleton, and parts of the structure, such as beams, are exposed, resulting in a tacky design.

[0009] Therefore, an object of the present invention is to solve the problems of the above-described conventional technology, use the field edge used as the ceiling base material as the ceiling decorative material as it is, reduce the weight of the ceiling, avoid handling as a specific ceiling, and adjust the mounting pitch and arrangement order of field edges with different widths to combine them to realize a ceiling surface with various designs. The present invention aims to provide a lightweight suspended ceiling structure.

Means for Solving the Problems

[0010] The present invention is characterized in that a ceiling base material suspended from a ceiling frame forms a louver ceiling. The ceiling trim consists of a combination of double and single joists, with the double joists arranged at predetermined intervals along the longitudinal direction of the ceiling surface to cover the entire ceiling surface, and the single joists, whose length is adjusted to form a predetermined geometric shape, arranged between adjacent double joists, so that the predetermined geometric shape is arranged within the ceiling surface covered by the double joists. The double and single joists are installed at predetermined intervals to cover the ceiling surface. It is characterized in that a louver ceiling is configured.

[0012] The ceiling surface preferably has a height from the floor surface of 6 m or more and a horizontal projected area of 200 m 2 or more.

[0013] The ceiling surface preferably adjusts the arrangement interval of the above-mentioned Double joists and single joists field edges so that its mass is 2.0 kg / m 2 or less.

[0014] The ceiling surface is preferably a louver light ceiling that reflects the light irradiated on the lower surface of the field edge.

[0015] The ceiling surface is preferably a louver ceiling that finishes the ceiling frame and the ceiling base material in a dark color and creates a contrast with the metallic glossy surface on the lower surface of the field edges arranged linearly in large numbers on the front surface thereof.

Effects of the Invention

[0016] By configuring the lightweight suspended ceiling structure of the present invention as described above, it is possible to avoid a specific ceiling because it is lightweight, the risk of the ceiling material falling during a major earthquake is small, and the design property of the ceiling surface can be enhanced.

Brief Description of the Drawings

[0017] [Figure 1] An overhead view showing an example of the arrangement of the soffits as an embodiment of the lightweight suspended ceiling structure of the present invention. [Figure 2] A perspective view schematically showing a part of the lightweight suspended ceiling structure shown in FIG. 1 provided in the atrium of the building and the atrium. [Figure 3] An overhead view of the lightweight suspended ceiling structure shown in FIG. 2. [Figure 4] A partial overhead view showing an enlarged view of the inside of the square frame shown in FIG. 3. [Figure 5] A ceiling plan view showing an example of the arrangement of each soffit shown in FIG. 1 and the soffit receiving members that hold each soffit. [Figure 6] A partial perspective view showing an enlarged view of the hanging and holding state of the soffit inside the parallelogram frame shown in FIG. 4.

Mode for Carrying Out the Invention

[0018] Hereinafter, as an embodiment of the lightweight suspended ceiling structure of the present invention, it will be described with reference to the accompanying drawings.

[0019] Figure 1 is a view from directly below (the center of the first floor of the atrium 1) of the ceiling surface 11, which is made up of a lightweight suspended ceiling structure 10 installed as the ceiling surface 11 of an atrium 1 that extends from the first to the third floor within the building shown in Figure 2. The building shown in this example is constructed as a shopping center, and has a plan shape in which store buildings 2 extend in two directions, forming a bend of approximately 115° at the center of the building's plan, with the atrium 1 located at the bend of the building. As shown in Figure 2, the atrium 1, where the circulation routes of the store buildings 2 extending in two directions intersect, has a plaza on the first floor. In addition, handrails 3 are installed on each floor surrounding the atrium 1, creating a corridor that allows customers moving between the stores on each floor to walk around while overlooking the atrium space. On one side of the atrium 1, a large digital signage 4 is installed, supported by a steel frame extending from the first floor to the ceiling. Behind it, an escalator 5 is installed to provide access between each floor (Figure 2). The images displayed on the digital signage 4 can be viewed from the first floor and over the handrails on each floor facing the atrium 1.

[0020] The ceiling shape of this open space 1 is a flat, roughly hexagonal shape, as shown in Figure 1, and its horizontal projection area is 200 m². 2 Beyond the ridge, a large digital signage 4 with a screen extending from the second floor level to the third floor level is installed on a part of one side of the central position where the protrusion is formed (Figure 2). In Figure 1, the installation positions of the digital signage 4 and the underlying steel frame supporting the digital signage 4 are drawn with dashed lines to help understand the positional relationship between the ceiling surface 11 and the digital signage 4.

[0021] A louvered ceiling 12, which is one embodiment of the lightweight suspended ceiling structure 10 of the present invention, is installed on the ceiling surface 11 of this open space 1. As the ceiling decorative material 20 that constitutes the ceiling surface 11 of the louvered ceiling 12, a double joist 21 that covers almost the entire surface of the ceiling surface 11 along the longitudinal direction of the ceiling surface 11 and a single joist 22 that is cut to a predetermined length and arranged to form a predetermined geometric shape that enhances the design of the louvered ceiling 12 are used.

[0022] As shown in Figure 1, the louvered ceiling 12 has double joists 21 arranged at equal intervals (@300 mm) along the longitudinal direction across the entire ceiling area, which is divided into a flat, roughly hexagonal shape. Furthermore, single joists 22 of a predetermined length are placed at intermediate positions between adjacent double joists 21. That is, where single joists 22 are placed, the spacing (adjacent) between the double joists 21 and the single joists 22 is 150 mm.

[0023] The furring strips used in this embodiment consist of off-the-shelf components made of 0.5 mm thick hot-dip galvanized steel sheets, designated as JIS 19 type CW (double furring strips) and CS (single furring strips 22). The web surfaces of the double furring strips 21 and single furring strips 22 are facing downwards and used as ceiling decorative material 20. Furthermore, the single furring strips 22 have a ceiling surface mass of 2.0 kg / m 2 The louvered ceiling 12 is arranged in combination with double joists 21 that are arranged across the entire surface of the ceiling 11, as shown below. This avoids the louvered ceiling 12 being treated as a specific type of ceiling.

[0024] In this embodiment, the louvered ceiling 12 is designed so that a predetermined geometric shape is formed on the ceiling surface 11 by using single joists 22 of a predetermined length between adjacent double joists 21, with double joists 21 arranged over almost the entire surface of the ceiling 11 as the background. For example, in this embodiment, as shown in Figure 1, the single joists 22 are first arranged to form a large, roughly isosceles triangle with a base of approximately 11m and a height of approximately 10m, with the installation position of the digital signage 4 being the base, at approximately the center of the ceiling surface 11. Furthermore, in order so that the overall design of the elongated ceiling surface 11 is symmetrical with respect to this roughly isosceles triangle section 12A, two trapezoidal sections 12B are provided on one side, extending from a position corresponding to the hypotenuse 12Aa of the roughly isosceles triangle section 12A to both ends in the longitudinal direction of the ceiling surface 11, forming a roughly trapezoidal shape 12B with two sides 12Ba and 12Bb parallel to the hypotenuse 12Aa of the roughly isosceles triangle section 12A. Dimensionally, the single joists 22 are arranged to form a roughly trapezoidal section 12B with a side length of approximately 3.0m in the longitudinal direction of the ceiling, approximately 5.0m away from the position corresponding to the hypotenuse 12Aa of the roughly isosceles triangle section 12A, and to form a roughly trapezoidal section 12C with a side length of approximately 1.2m in the longitudinal direction of the ceiling, along the edge of the ceiling surface 11. The ceiling mass of the louver ceiling 12 (Figure 1) designed to include these geometric shapes (12A, 12B, 12C) is 1.97 kg / m 2 So, 2.0 kg / m 2 The following applies, and it is avoided being treated as a specific ceiling.

[0025] Figure 3 is a top view showing an example of how double joists 21 and single joists 22, arranged in the design shown in Figure 1, are actually installed as a louvered ceiling 12 in a building, for example, as shown in Figure 2. Figure 4 is a top view showing an enlarged view of the square frame (IV) in Figure 3. In the installation examples shown in Figures 3 and 4, the entire area demarcated as the ceiling surface 11, including the underside of the upper floor slab, beams, and ceiling base material 30 (composed of various components such as suspension fittings, suspension bolts, hangers, clips, and joist supports, as described later), is painted in a dark, dark brown color as an example, and the double joists 21 and single joists 22 are attached to the joist supports 31 (Figures 5 and 6) as the ceiling base material 30 at predetermined intervals. Since the double joists 21 and single joists 22 are made of unpainted hot-dip galvanized steel sheets, as shown in Figures 2 to 4, the undersides of each joist, with their metallic sheen and multiple linear lines positioned in front of the dark background, are arranged in high contrast. Furthermore, by arranging the single joists 22 within the arrangement of the double joists 21, a ceiling surface 11 is obtained in which the geometric shapes of the roughly isosceles triangle section 12A and roughly trapezoidal sections 12B, 12C stand out. Needless to say, the geometric shapes formed by the single joists 21 can be various shapes other than the roughly isosceles triangles mentioned above, such as trapezoids, rectangles, squares, circles, ovals, ellipses, and randomly changing shapes.

[0026] Furthermore, in this embodiment, since the large screen of the digital signage 4 is located below the base of the roughly isosceles triangle section 12A, the various colors of the images displayed on the screen of the digital signage 4 are reflected by each of the metal joists that make up the ceiling surface 11. As a result, the ceiling surface 11 forming the roughly isosceles triangle section 12A, which is composed of double joists 21 and single joists 22, functions as a louvered light ceiling that utilizes reflected light to create a colorful effect.

[0027] Figure 5 is a plan view of the ceiling surface 11, showing an example of the arrangement of the double joists 21 and single joists 22 that constitute the ceiling surface 11 shown in Figure 1, and the joist supports 31 that support each joist. Each joist support 31 is made of a pre-fabricated component processed from a 1.2 mm thick hot-dip galvanized steel sheet as a C-shaped steel, and is arranged in sufficient numbers to hold each double joist 21 and single joist 22 in an even balance, parallel to the hypotenuse 12Aa of the approximately isosceles triangular section 12A shown in Figure 1. They are suspended from the upper floor slab surface (not shown) via suspension bolts 32, which will be described later.

[0028] Figure 6 is a schematic partial perspective view showing the suspension state of the double furring strips 21 and single furring strips 22 in the area enclosed by the parallelogram frame (VI) in Figure 5. As shown in the figure, the single furring strips 22, which are of a predetermined length and are aligned, are firmly fixed and held to two furring strip supports 31 suspended from the upper floor slab via known clips 33 and threaded suspension bolts 32 of a predetermined bolt diameter, so as to form a substantially trapezoidal shape at the end of the ceiling surface 11, with sides parallel to the sides of the slanted end of the ceiling surface 11. The double furring strips extending in the longitudinal direction of the ceiling surface 11 are also fixed and held to these furring strip supports 31 via known clips 34, similar to the single furring strips 22. Since these double furring strips 21, single furring strips 22, and the members supporting them are common materials used as ordinary ceiling underlayment, the installation can be completed by interior decorators with ordinary skills. This allows for cost reduction and shortened construction time. Furthermore, by varying the size and type of ceiling joists and arranging them in different ways, a variety of innovative designs become possible.

[0029] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are possible within the scope of each claim. In other words, embodiments obtained by combining technical means that have been appropriately modified within the scope of the claims are also included in the technical scope of the present invention. [Explanation of Symbols]

[0030] 1. Atrium 4. Digital Signage 10 Lightweight suspended ceiling structure 11 Ceiling surface 12 Louvered ceiling 20 Ceiling trim 21 Double rafters 22 Single veranda 30 Ceiling underlayment 31. Ceiling joist support 32 Suspension bolts

Claims

1. A lightweight suspended ceiling structure is characterized in that a combination of double and single joists is attached to a ceiling base material suspended from the ceiling frame, the double joists are arranged at predetermined adjacent intervals in the longitudinal direction of the ceiling surface so as to cover the entire ceiling surface, and the single joists, whose length is adjusted to form a predetermined geometric shape, are arranged between adjacent double joists, so that a predetermined geometric shape is arranged within the ceiling surface covered by the double joists, thereby forming a louvered ceiling that covers the ceiling surface.

2. The aforementioned ceiling surface has a height of 6m or more from the floor surface and a horizontal projection area of ​​200m². 2 The lightweight suspended ceiling structure according to claim 1, comprising the above-mentioned scale.

3. The aforementioned ceiling surface is configured such that the spacing between the double and single joists is adjusted to achieve a mass of 2.0 kg / m 2 The lightweight suspended ceiling structure according to claim 1 or 2, characterized in that it is as follows.

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