Ceiling height changing structure and ceiling structure

Abstract

To partially lower a ceiling height without redoing the design and construction of an existing ceiling substrate in a system ceiling.SOLUTION: The ceiling height changing structure 30 includes a plurality of suspended ceiling materials 32,., 32 whose lower surfaces are decorative surfaces, and a suspension structure 31 which is attached to the bar material 6 of the system ceiling 20 and the plurality of suspended ceiling materials 32,., 32 to suspend the plurality of suspended ceiling materials 32,., 32 from the bar material 6. A plurality of suspended ceilings 32,., 32 are arranged so as to form a suspended ceiling-surface C1 for covering a section corresponding to the specific area of the ceiling-surface C2 of the system ceilings 20 under the system ceilings 20 by the facing surfaces of a plurality of the suspended ceilings 32,., 32.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a ceiling height adjustable structure and a ceiling structure equipped with the same. [Background technology]

[0002] Conventionally, system ceilings have been commonly used in offices, allowing for the efficient placement of lighting equipment, air conditioning equipment, and safety equipment (detectors, sprinklers, smoke exhaust equipment, inspection hatches, etc.) (see, for example, Patent Document 1 below). System ceilings are constructed by assembling multiple metal bars in a parallel or lattice pattern, and various types of equipment and ceiling materials are placed on a ceiling base suspended from a ceiling slab. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-173064 Summary of the Invention [Problem to be solved by the invention]

[0004] In some cases, a relatively large indoor space is divided into multiple areas according to the intended use. In such cases, it may be desirable to change the ceiling height of some areas so that the location of each area is easy for users to understand and the design of each area is suited to the intended use.

[0005] For example, in an office space, individual work areas with individual desks and chairs may be separated from common areas where multiple people gather for work such as meetings and consultations. It may be desirable to change (lower) the ceiling height of the common area so that the locations of the individual work areas and the common area are easier for users to understand, and so that the common area becomes a calm space suitable for use, for example, for meetings.

[0006] However, with system ceilings, the ceiling materials can be easily attached and detached, making it easy to change the ceiling material. However, even if the ceiling material is changed, the ceiling height remains the same because it is simply placed on the same ceiling substrate. Therefore, to change the ceiling height of part of a system ceiling, the ceiling substrate on which the ceiling material is placed must be redesigned and redone so that it is positioned lower in that area. Furthermore, whenever the position of an area is changed, the ceiling substrate must be redesigned and redone.

[0007] The present invention was made in consideration of these points, and its purpose is to make it possible to partially lower the ceiling height in a system ceiling without redoing the design and construction of the existing ceiling base. [Means for solving the problem]

[0008] In order to achieve the above-mentioned objective, in this invention, in a specific area of ​​the space below the system ceiling, multiple plate-like bodies are hung from bar material, and a suspended ceiling surface is formed below the system ceiling using the decorative surfaces on the undersides of the multiple hung plate-like bodies, thereby lowering the ceiling height in the specific area.

[0009] Specifically, the first invention is a ceiling height change structure for lowering the ceiling height of a specific area of ​​the space below a system ceiling having a ceiling substructure made of bar materials suspended from a ceiling slab arranged in parallel or a lattice pattern, and a plurality of system ceiling materials supported by their peripheral portions resting on the ceiling substructure, and is characterized in that it comprises a plurality of plate-shaped bodies whose undersides form decorative surfaces, and hanging devices attached to the bar materials and the plurality of plate-shaped bodies to suspend the plurality of plate-shaped bodies from the bar materials, and the plurality of plate-shaped bodies are arranged so that the decorative surfaces of the plurality of plate-shaped bodies form a suspended ceiling surface below the system ceiling that covers the portion of the ceiling surface of the system ceiling corresponding to the specific area.

[0010] In this invention, "the space below the system ceiling" simply refers to the space below the system ceiling, regardless of whether it is indoors or outdoors, and "ceiling height of a specific area" refers to the height from the floor to the suspended ceiling surface if it is indoors, and refers to the height from the ground to the suspended ceiling surface if it is outdoors.

[0011] In the first invention, a plurality of plate-like bodies are suspended from the bar members of a system ceiling using suspension devices, and the decorative surfaces of the plurality of plate-like bodies form a suspended ceiling surface below the system ceiling that conceals a portion of the ceiling surface of the system ceiling corresponding to a specific area. With this configuration, a suspended ceiling made up of a plurality of plate-like bodies is installed below the system ceiling in the specific area, creating a double-ceiling structure. People in the specific area cannot see the system ceiling surface above the suspended ceiling (a plurality of plate-like bodies), and instead perceive the suspended ceiling surface below the system ceiling as the ceiling surface. Thus, with the ceiling height adjustment structure according to the first invention, the ceiling height of a system ceiling can be partially lowered simply by suspending the suspended ceiling from the existing bar members, without having to redesign and install the existing ceiling base.

[0012] Furthermore, in the first invention, the suspended ceiling surface is formed at a lower position than the ceiling surface of the system ceiling, and by forming the suspended ceiling surface to correspond above and below the specific area, people below the system ceiling can easily find the specific area below by looking for the suspended ceiling surface formed at a lower position than the others. Therefore, according to the ceiling height adjustable structure of the first invention, the suspended ceiling surface is lowered by one step, making it possible for people below the system ceiling to easily find the location of the specific area.

[0013] The second invention is characterized in that, in the first invention, the space below the system ceiling is an office space having a personal work area where an individual works alone and a common area where multiple people work together, and the suspended ceiling surface is formed with one of the personal work area and the common area as the specified area.

[0014] In the second invention, one of the personal work area and the common area in the office space is designated as a specific area, and the ceiling surface of the system ceiling directly above it is obscured by the suspended ceiling surface and cannot be seen, while the ceiling surface of the system ceiling is visible in the other area. In other words, with the ceiling height adjustable structure of the second invention, the ceiling height of one of the personal work area and the common area in an office space where a system ceiling has been installed can be changed (lowered) without redoing the design and construction of the ceiling base of the existing system ceiling. Furthermore, by changing (lowering) the ceiling height of one of the personal work area and the common area in this way, people below the system ceiling can easily understand the location of the personal work area and the common area.

[0015] The third invention is characterized in that, in the first invention, an evacuation guideway is provided as the specific area in the space below the system ceiling, and the suspended ceiling surface is arranged so as to cover and conceal the part of the system ceiling corresponding to the evacuation guideway.

[0016] In the third invention, the ceiling surface of the system ceiling directly above the evacuation route as a specific area is obscured by the suspended ceiling surface and is therefore invisible, making the ceiling surface of the evacuation route appear to be composed of a suspended ceiling surface. Therefore, the ceiling height of the evacuation route (height from the floor or ground to the suspended ceiling surface) is lower than the ceiling height of other areas (height from the floor or ground to the ceiling surface of the system ceiling). In other words, according to the third invention, the ceiling height of the evacuation route as a specific area can be changed (lowered) without redoing the design and construction of the existing system ceiling's ceiling base. Furthermore, by making the ceiling height of the evacuation route as a specific area lower than that of other areas, people below the system ceiling can easily identify the location of the evacuation route.

[0017] A fourth invention is any one of the first to third inventions, characterized in that the plate-like body has a decorative surface with a design different from that of the system ceiling material.

[0018] Incidentally, in recent years, decorative applications using inkjet printing have become more common for ceiling materials, and the use of highly decorative ceiling materials with decorative surfaces printed with colors or patterns other than white, such as black or wood grain, is increasing. However, in system ceilings, bar materials made of white painted steel sheets are often used to match the white ceiling materials, and even if highly decorative ceiling materials are used, the design does not match the conventional white bar materials, and there is a risk that the aesthetic appearance of the ceiling will be impaired.

[0019] In the fourth invention, the plate-like bodies forming the suspended ceiling surface have a different design from the system ceiling material and decorative surface. Furthermore, since the multiple plate-like bodies are arranged so that the suspended ceiling surface covers a portion of the system ceiling surface that corresponds to a specific area, the design of the ceiling surface in the specific area differs from the design of the system ceiling surface. In other words, the ceiling height adjustment structure according to the fourth invention not only allows the ceiling height to be partially lowered by simply suspending the suspended ceiling on the existing bar material without having to redesign and install the existing ceiling base, but also allows the design of the ceiling surface to be partially changed without compromising the aesthetic appearance of the ceiling.

[0020] The fifth invention is characterized in that, in the fourth invention, the decorative surface of the plate-like body and the decorative surface of the system ceiling material have different designs due to differences in at least one of color, pattern, and shape.

[0021] In the fifth aspect of the present invention, the difference in design between the decorative surface of the plate-like body and the decorative surface of the system ceiling material is formed by a difference in at least one of color, pattern, and shape, making it easy to create a difference in design between the decorative surface of the plate-like body and the decorative surface of the system ceiling material.

[0022] A sixth invention is the fourth invention, characterized in that one of the plate-like body and the system ceiling material has a decorative surface with a wood grain pattern.

[0023] In the sixth invention, either the ceiling material of the suspended ceiling surface directly above the specific area of ​​the space or the ceiling material of the system ceiling directly above the area other than the specific area has a wood-grain pattern decorative surface, resulting in a wood-grain pattern on the ceiling surface. Ceiling materials generally have plain decorative surfaces without a pattern. If the design distinction between the suspended ceiling surface and the system ceiling surface were indicated by a color difference, it would be easy to distinguish, but the color difference would be too noticeable and could create a sense of incongruity in the design. By providing a wood-grain pattern decorative surface on one of the ceiling materials, either the plate-shaped body or the system ceiling material, as in the ceiling height adjustable structure of the sixth invention, a wood-grain ceiling surface is partially visible on the ceiling surface, and by changing the design of one of the suspended ceiling surface and the system ceiling surface from the other, the distinction is easily distinguished, while creating a ceiling surface with a natural design.

[0024] The seventh invention is characterized in that, in the fourth invention, one of the decorative surfaces of the plate-like body and the system ceiling material is a printed surface formed by inkjet printing.

[0025] In the seventh invention, either the decorative surface of the plate-like body that forms the suspended ceiling surface or the decorative surface of the system ceiling material that forms the ceiling surface of the system ceiling is a printed surface formed by inkjet printing, so that not only can patterns etc. be easily formed to create differences in design between the suspended ceiling surface and the ceiling surface of the system ceiling, but changes to patterns etc. can also be made easily.

[0026] Furthermore, while inkjet ceiling materials with inkjet-printed surfaces can produce excellent designs, they are relatively expensive, and using such expensive inkjet ceiling materials on the entire ceiling surface increases costs. However, as in the present invention, by effectively using this inkjet ceiling material only on a portion of the ceiling surface, such as on a suspended ceiling surface or on the ceiling surface of a system ceiling, in a natural and effective manner, the inkjet ceiling material can be used in combination with low-cost ceiling materials with patterns such as general paint, thereby reducing the cost of the entire ceiling surface. In particular, by using inkjet-printed ceiling materials for visibility in specific areas, there is a point in using them, even if they are expensive inkjet-printed.

[0027] Furthermore, inkjet printing can also be used to print letters and figures in addition to patterns, and printing these on the decorative surface of the ceiling material using inkjet printing has the advantage of making it possible to more specifically identify the purpose of a specific area, etc.

[0028] The eighth invention is a ceiling structure equipped with a system ceiling having a ceiling substructure made of bar materials suspended from a ceiling slab arranged in parallel or lattice pattern, and a plurality of system ceiling materials supported by having their peripheral portions rested on the ceiling substructure, characterized in that it is equipped with a ceiling height change structure according to any one of the first to third inventions for lowering the ceiling height of a specific area in the space below the system ceiling below that of other areas.

[0029] In the eighth invention, by applying the ceiling height changing structure according to any one of the first to third inventions to a ceiling structure equipped with a system ceiling, the same actions and effects as any one of the first to third inventions can be obtained. [Effects of the Invention]

[0030] As described above, according to the present invention, in a specific area of ​​the space below a system ceiling, multiple plate-like bodies are hung from bar material and a suspended ceiling surface is formed below the system ceiling using the decorative surfaces of the multiple hung plate-like bodies, thereby lowering the ceiling height in the specific area.Therefore, it is possible to partially lower the ceiling height in a system ceiling without redoing the design and construction of the existing ceiling substructure. [Brief explanation of the drawings]

[0031] [Figure 1] FIG. 1 is a plan view showing a part of a space in which a ceiling structure according to a first embodiment is installed. [Figure 2] FIG. 2 is a cross-sectional view of the space of FIG. [Figure 3] FIG. 3 is a cross-sectional view showing a part of the ceiling structure of the first embodiment. [Figure 4] FIG. 4 is an enlarged cross-sectional view showing the bar material and the hanging structure portion of FIG. [Figure 5] FIG. 5 is an exploded perspective view of the bar material and the hanging structure of FIG. [Figure 6] FIG. 6 is a perspective view showing a part of the ceiling structure of the first embodiment. [Figure 7] FIG. 7 is a view of the ceiling structure at the boundary between the individual work area and the shared area in the space of FIG. 1, seen from below. [Figure 8] FIG. 8 is a view of the ceiling structure of the second embodiment as viewed from below at the boundary between the evacuation guidance area and other areas in the space where the ceiling structure is constructed. DETAILED DESCRIPTION OF THE INVENTION

[0032] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following description of the embodiments is merely exemplary in nature and is not intended to limit the present invention, its applications, or uses.

[0033] First Embodiment of the Invention -Space configuration- Fig. 1 is a plan view of a space S in which a ceiling structure 10 according to embodiment 1 has been installed, and Fig. 2 is a cross-sectional view of the space S in which the ceiling structure 10 has been installed. In embodiment 1, the space S is an office space within a building, and in the following description, this office space will also be referred to as the "room." In the figure, F is the floor surface of the room, C1 is the ceiling surface of the system ceiling 20, W1 is an exterior wall having multiple windows w, W2 is a wall portion installed perpendicular to the exterior wall W1, and W3 is a partition wall installed parallel to the exterior wall W1, and these components define the room (office space).

[0034] In space S, a personal work area A1 occupies the majority of the space on the partition wall W3 side (left side in Figures 1 and 2), and a specific common area A2 is defined near the window on the exterior wall W1 side (right side in Figures 1 and 2). The personal work area A1 is an area where individuals work alone, while the common area A2 is an area where multiple people work together. Space S, which consists of office space, is divided into these two areas A1 and A2. The end of personal work area A1 on the common area A2 side is used as a passageway.

[0035] In the individual work area A1, excluding the aisle, multiple long tables D are arranged facing each other. At each long table D, multiple chairs c1 (three in Figures 1 and 2) are arranged facing the long table D with a gap between them. In addition, a personal computer PC is placed on each long table D corresponding to the chair c1.

[0036] Meanwhile, the common area A2 is equipped with a number of meeting tables T, ..., T, and a number of chairs c2, ..., c2, arranged facing each table T. A low cabinet LC, approximately the same height as the seat of the chair c2, is installed along the lower portion of the window w of the exterior wall W1, near the window in the common area A2. A cushion (not shown) is placed on the cabinet LC, so that when a person sits on the cushion, they face the table T by the window. In other words, the cabinet LC is configured to be used as a chair for the table T by the window. An ornamental plant P is placed on the end of the common area A2 on the wall W2 side perpendicular to the exterior wall W1. Furthermore, at the end of the common area A2 on the personal work area A1 side (left side in FIGS. 1 and 2), multiple cabinets HC (three in FIGS. 1 and 2) are arranged along the boundary of the area. The cabinet HC is about the eye level of a person sitting in the chair c2, and in this embodiment, a planter is embedded in the upper part and planted therein.

[0037] -Ceiling structure configuration- As shown in Figures 2 to 7, the ceiling structure 10 includes a system ceiling 20 and a ceiling height changing structure 30 that partially changes (lowers) the ceiling height of the space S below the system ceiling 20. The basic structure of the system ceiling 20 is conventionally well known.

[0038] [System ceiling] 3 and 4, a system ceiling 20 comprises a ceiling substrate 21 and a plurality of ceiling materials 22, ..., 22. In Fig. 3, 1 denotes a ceiling slab that constitutes the ceiling portion of the interior of the building, 2 denotes a suspension bolt whose upper end is embedded and fixed in the ceiling slab 1, and 3 denotes a hanger attached to the lower end of the suspension bolt 2 with nuts 4, 4.

[0039] <Ceiling underlayment> The ceiling substructure 21 is made up of a plurality of bar materials 6, ..., 6 arranged in a grid pattern. The ceiling substructure 21 is attached to the lower end of the hanger 3, and is suspended from the ceiling slab 1 by the suspension bolts 2 and the hanger 3. The plurality of bar materials 6, ..., 6 are called T-bars and have basically the same cross-sectional structure, and are made up of three types of bar materials 6 of different lengths. Specifically, the bar materials 6 are all long materials formed by bending and shaping, for example, a strip-shaped metal plate (hot-dip galvanized steel plate, etc.), and the only difference between the two is the structure of the connecting parts for connecting them to each other; they have the same longitudinal cross-sectional shape, which is roughly T-shaped (more specifically, a cross-sectional structure where the letter T is turned upside down).

[0040] Specifically, as shown in Fig. 4, each bar 6 is made of metal and has a T-shaped cross section. Each bar 6 has a hanging member 61 and a support member 62 attached to the lower end of the hanging member 61.

[0041] The hanging member 61 is a T-shaped cross-section member formed by bending a metal plate member and extending in a predetermined horizontal direction. The hanging member 61 has a fixing portion 63, a pair of connecting portions 64, 64, and a pair of locking portions 65, 65.

[0042] The fixing portion 63 is a generally cylindrical portion located at the upper end of the hanging member 61. The fixing portion 63 has an upper plate portion 63a, a pair of side plate portions 63b, 63b continuous with both ends of the upper plate portion 63a in the width direction, and a pair of bottom plate portions 63c, 63c extending obliquely upward (toward each other) from the lower ends of the pair of side plate portions 63b, 63b toward the inside in the width direction, and extends in a predetermined horizontal direction.

[0043] The pair of connecting portions 64, 64 are plate-like portions extending downward and continuing from the inner ends of the bottom plate portions 63c, 63c of the fixed portion 63. The connecting portions 64, 64 extend from one end to the other end in the longitudinal direction (the above-mentioned predetermined horizontal direction) of the fixed portion 63.

[0044] The pair of locking portions 65, 65 are plate-like portions that are continuous with the lower ends of the connecting portions 64, 64 and extend outward in the width direction (in directions moving away from each other in the horizontal direction). The locking portions 65, 65 extend from one end to the other end of the connecting portions 64, 64 in the longitudinal direction (the above-mentioned predetermined horizontal direction).

[0045] Support member 62 is a cylindrical member with a C-shaped cross section that opens downward and is formed by bending a metal plate-like member, and extends in a predetermined horizontal direction, similar to suspending member 61. Support member 62 has an upper plate portion 66 that extends in the width direction along below the pair of locking portions 65 of suspending member 61, a pair of engaging portions 67, a pair of side plate portions 68, and a pair of bottom plate portions 69.

[0046] The upper plate portion 66 extends in the width direction below the pair of locking portions 65 of the hanging member 61, and engaging portions 67 are continuous with both ends in the width direction. The engaging portions 67 are raised slightly upward from both ends of the upper plate portion 66, then extend inward in the width direction, and then bend back upward and extend outward in the width direction to a position outside the end of the upper plate portion 66 in the width direction. Side plate portions 68 are continuous with the ends of the engaging portions 67. The side plate portions 68 extend downward from both ends of the engaging portions 67, and bottom plate portions 69 are continuous with the lower ends of the side plate portions 68. The bottom plate portions 69 extend inward in the width direction (toward each other) from the lower ends of the side plate portions 68, and then bend back upward and extend outward in the width direction.

[0047] A small gap is formed between the upper plate portion 66 of the support member 62 and the pair of engaging portions 67, 67. The pair of locking portions 65, 65 of the hanging member 61 are inserted into this gap, thereby attaching the support member 62 to the hanging member 61. Each bar 6 has a T-shaped cross section formed by the hanging member 61 and the support member 62 as described above, and the fixing portion 63 of the hanging member 61 is attached to the lower end of the hanger 3, so that the bar is suspended from the ceiling slab 1 with the T-shaped cross section facing inverted.

[0048] The plurality of bar members 6 are arranged in the front-to-back direction (horizontal-vertical direction) and the left-to-right direction (horizontal-horizontal direction) to form a lattice pattern in a plan view, and these bar members 6 form a flush ceiling substrate 21. A plurality of rectangular storage openings are formed between the bar members 6, and ceiling equipment (not shown), such as lighting fixtures and air conditioners, are fixedly supported in some of these storage openings, while ceiling members 22 are supported by their respective peripheral edges or are suspended from the bar members 6, 6. In the first embodiment, the ceiling equipment and ceiling members 22 form a lattice-like system ceiling surface. In the first embodiment, the unit length of the ceiling substrate 21 of the system ceiling 20 is set to 600 mm, and the plurality of bar members 6 are arranged in the ceiling substrate 21 at 600 mm intervals in the front-to-back direction and the left-to-right direction.

[0049] <Ceiling materials> As shown in FIG. 3, each ceiling material 22 is made of rock wool and has a size (e.g., 590 x 590 mm) that corresponds to the size of the storage opening. The size and material of the ceiling material 22 are not particularly limited, and any size and material may be used. As shown in FIG. 4, each ceiling material 22 has a cutout step 22a formed by cutting out a rectangular cross section from the lower corner of the four peripheral edges. The ceiling material 22 is supported by the bar materials 6 in a state where it is resting on the bar materials 6 by placing the lower surface of each cutout step 22a on the upper surfaces of the engaging portions 67 of the support members 62 of the four bar materials 6 surrounding the storage opening.

[0050] The underside of each ceiling material 22, excluding the stepped portions 22a around the four periphery, is painted in plain white (without a pattern), and the underside, excluding the stepped portions 22a around the four periphery, is a decorative surface. A large number of randomly arranged recessed holes (not shown) for sound absorption are formed in the decorative surface of each ceiling material 22. Note that the design of the decorative surface of the ceiling material 22 is not limited to the above and may be any design.

[0051] [Ceiling height adjustable structure] 2 to 7, the ceiling height adjustable structure 30 includes a suspension structure (suspending device) 31 and a plurality of suspended ceiling materials 32, ..., 32. In a specific area of ​​the space S below the system ceiling 20, the ceiling height adjustable structure 30 suspends a plurality of suspended ceiling materials 32, ..., 32 from bar materials 6 using the suspension structure 31, thereby forming a suspended ceiling surface C2 below the system ceiling 20 that covers and conceals the ceiling surface C1 of the system ceiling 20, thereby partially lowering the ceiling height of the specific area. In this first embodiment, an example will be described in which the specific area is a common area A2.

[0052] <Suspended structure> As shown in Figures 3 to 6, the suspension structure 31 includes a plurality of suspension parts 33, ..., 33 and a suspended ceiling substrate 34. The suspension parts 33 are attached to the bar material 6, and the suspended ceiling substrate 32 is attached to the plurality of suspension parts 33, ..., 33, and a plurality of suspended ceiling materials 32, ..., 32 are attached.

[0053] (hanging part) As shown in FIGS. 4 and 5, the suspension part 33 includes two T-bolts 35a, 35a, two small nuts 35b, 35b, a suspension bolt member 36, a hanger 37, and two large nuts 38a, 38b.

[0054] The T-bolt 35a has a bolt head that is rectangular in plan view, resulting in a T-shape in side view. The T-bolt 35a is sized so that the bolt head rests on the pair of bottom plate portions 69, 69 of the support member 62 of the bar material 6. The small nut 35b is threaded onto the bolt portion (male thread portion) of the T-bolt 35a, thereby attaching the suspension bolt member 36 to the bottom of the bar material 6.

[0055] The suspension bolt member 36 has a plate portion 36a and a bolt portion 36b. The plate portion 36a is a long (approximately 200 mm) plate that is rectangular in plan view. The bolt portion 36b is connected to the underside of the plate portion 36a at the center in the longitudinal direction. Insertion holes h1, through which the bolt portions of the T-bolts 35a are inserted, are formed at positions a predetermined length (approximately 25 mm) away from both ends in the longitudinal direction. The bolt portion 36b is a w3 / 8 bolt and is fixed to the plate portion 36a by welding or the like. The suspension bolt member 36 is attached to the lower end of the bar 6 by passing two T-bolts 35a, 35a placed on a pair of bottom plate portions 69, 69 of the support member 62 of the bar 6 through the two insertion holes h1 and then screwing and tightening two small nuts 35b, 35b onto the corresponding T-bolts 35a.

[0056] Hanger 37 is a hanging hardware formed by bending a steel plate and includes mounting portion 37a, hanging portion 37b, and retaining portion 37c. Mounting portion 37a is a rectangular plate-like portion extending horizontally, with an insertion hole h2 formed in the center through which bolt portion 36b of hanging bolt member 36 is inserted. Hanging portion 37b is a rectangular plate-like portion extending downward from one side of mounting portion 37a. Retaining portion 37c is a U-shaped cross-section portion that extends downward from the lower end of hanging portion 37b, bends vertically, extends horizontally, and then bends vertically again to extend upward. Hanger 37 is attached to hanging bolt member 36 by passing bolt portion 36b of hanging bolt member 36, with large nut 38a threaded thereon, through insertion hole h2, and then threading and tightening large nut 38b onto bolt portion 36b of hanging bolt member 36. A joist support 39 of the suspended ceiling base 34, which will be described later, is inserted into the retaining portion 37c of the hanger 37. The joist support 39 is inserted into the retaining portions 37c of the hangers 37 of the multiple hanging parts 33, ..., 33, and is supported by the multiple hanging parts 33, ..., 33. The height of the hanger 37 can be changed by changing the height of the two large nuts 38a, 38b, and the installation height of the joist support 39 can be made uniform.

[0057] (Suspended ceiling base) As shown in Figure 6, the suspended ceiling base 34 includes a plurality of joist supports 39, ..., 39 and a plurality of joist supports 40, ..., 40. The suspended ceiling base 34 is formed in a lattice shape by arranging a plurality of joist supports 39, ..., 39 in parallel below the plurality of joist supports 39, ..., 39 that are supported by a plurality of hanging parts 33, ..., 33 and arranged in parallel, and connecting the plurality of joist supports 40, ..., 40 to the plurality of joist supports 39, ..., 39 so as to be perpendicular to the joist supports 39, ..., 39.

[0058] The joist support 39 is made of a channel (channel steel) formed by bending a single strip-shaped steel plate into a U-shaped cross section. As described above, the joist support 39 is inserted into the holding portions 37c of the hangers 37 of the multiple hanging parts 33, ..., 33 with the U-shaped opening facing the part that continues to the hanging part 37b of the holding portions 37c, and is fixed to the hangers 37 of the multiple hanging parts 33, ..., 33.

[0059] The siding 40 is made up of two types of channels (channel steel) of different widths, each made by bending a single strip of steel plate into a U-shaped cross section. The wide siding 40 and the narrow siding 40 have the same plate thickness and height, differing only in width. The width of the narrow siding 40 is half the length of the wide siding 40. The wide siding 40 and the narrow siding 40 are arranged alternately and parallel at a specified interval, and are fixed to multiple siding supporters 39,...,39 with the U-shaped opening facing upward.

[0060] <Suspended ceiling material> As shown in Figures 6 and 7, the suspended ceiling material 32 is made up of a rectangular plate-like body, and the underside is made up of a decorative surface. Any plate-like body can be used as the suspended ceiling material 32, but it is preferable to use a material that is lighter than the ceiling material 22 of the system ceiling 20 (for example, 2 kg / m 2) is preferably used. For example, panel materials (plate-shaped bodies) made of fiber materials such as glass wool, rock wool, ceramic wool, etc., panel materials (plate-shaped bodies) made of foamed resin such as urethane wrapped in an aluminum sheet or glass fiber sheet, and panel materials (plate-shaped bodies) made of foamed metal such as aluminum can be used as the suspended ceiling material 32. In particular, if the suspended ceiling material 32 is made of panel materials (plate-shaped bodies) made of a material with high sound absorption properties such as glass wool, a sound absorbing effect can also be expected.

[0061] The underside of each suspended ceiling material 32 is decorated with a design different from that of the decorative surface of the ceiling material 22 of the system ceiling 20. In the first embodiment, a black marble-like pattern (not shown) is printed on the underside of each suspended ceiling material 32 by inkjet printing, forming the underside as a decorative surface. The design of the decorative surface (underside) of the suspended ceiling material 32 is not limited to the above and may be any design, and may be the same design as that of the decorative surface of the ceiling material 22 of the system ceiling 20. However, from the viewpoint of making it easier to distinguish the specific area (common area A2 in the first embodiment) from other areas, it is preferable that the design be different from that of the decorative surface of the ceiling material 22 of the system ceiling 20. Furthermore, the means for decorating the underside of the suspended ceiling material 32 is not limited to inkjet printing and may be any means. For example, the underside of the suspended ceiling material 32 may be decorated by a painting method other than inkjet printing, or by attaching a decorative material.

[0062] 6, the suspended ceiling material 32 is fixed to the plurality of joists 40, ..., 40 by tapping screws 41 driven from below with the upper surface abutting against the underside of the plurality of joists 40, ..., 40 of the suspended ceiling base 34. The plurality of suspended ceiling materials 32, ..., 32 are arranged without gaps so that the end faces of adjacent suspended ceiling materials 32 abut against each other, and are fixed to the suspended ceiling base 34. By fixing the plurality of suspended ceiling materials 32, ..., 32 to the lower end of the suspended ceiling base 34 without gaps in this way, a suspended ceiling surface C2 that partially covers and hides the ceiling surface C1 of the system ceiling 20 is formed below the system ceiling 20 by the decorative surfaces (undersides) of the plurality of suspended ceiling materials 32, ..., 32.

[0063] -Application of ceiling height change structure- As shown in FIG. 2, in the first embodiment, the ceiling height adjustable structure 30 is applied to a common area A2, which is a specific area of ​​the space S below the system ceiling 20.

[0064] Specifically, a plurality of suspended ceiling materials 32, ..., 32 are suspended by a suspension structure 31 from the ceiling base 21 (bar materials 6) of the system ceiling 20 in the common area A2, and the plurality of suspended ceiling materials 32, ..., 32 are arranged so that their decorative surfaces (undersides) form a suspended ceiling surface C2 below the system ceiling 20 that covers the portion of the ceiling surface C1 of the system ceiling 20 that corresponds to the common area A2. More specifically, the plurality of suspended ceiling materials 32, ..., 32 are arranged vertically and horizontally without any gaps directly above the common area A2 so as to correspond above and below the common area A2, with the end faces of adjacent suspended ceiling materials 32 abutting each other.

[0065] It should be noted that "multiple suspended ceiling materials 32, ..., 32 are positioned directly above the common area A2" does not limit the multiple suspended ceiling materials 32, ..., 32 and the common area A2 to an exact vertical correspondence in terms of area, shape, etc., but refers to the degree to which their positional relationship is related.

[0066] In this way, when the ceiling height adjustable structure 30 is applied to the common area A2, the ceiling structure 10 in the common area A2 becomes a double ceiling structure comprising a system ceiling 20 and a suspended ceiling (plurality of suspended ceiling materials 32, ..., 32). Therefore, people in the common area A2 cannot see the ceiling surface C1 of the system ceiling 20 above due to the suspended ceiling, and instead perceive the suspended ceiling surface C2 below the system ceiling 20 as the ceiling surface. In this way, by applying the ceiling height adjustable structure 30 to the common area A2, the ceiling height of the common area A2 can be lowered below that of other areas (personal work area A1).

[0067] Furthermore, the ceiling height change structure 30 forms the suspended ceiling surface C2 at a position lower than the ceiling surface C1 of the system ceiling 20 so that it corresponds above and below to the common area A2, so that people in the space S (below the system ceiling 20) can easily find the suspended ceiling surface C2, which is formed at a lower position than the others, and can easily recognize that the area with a low ceiling height where the suspended ceiling surface C2 is provided is the common area A2, and can also easily recognize that the area with a high ceiling height where the suspended ceiling surface C2 is not provided is the personal work area A1.

[0068] 7, in this embodiment 1, the design of the decorative surface of the ceiling material 22 of the system ceiling 20 is different from the design of the decorative surface of the suspended ceiling material 32. As a result, the design of the ceiling surface above the personal work area A1 (ceiling surface C1 of the system ceiling 20) is different from the design of the ceiling surface above the common area A2 (suspended ceiling surface C2).

[0069] In addition, "the decorative surface of the ceiling material 22 and the decorative surface of the suspended ceiling material 32 have different designs" means that the designs differ due to differences in at least one of the color, pattern, and shape of the decorative surface of the ceiling material 22 and the decorative surface of the suspended ceiling material 32.

[0070] In this embodiment 1, the decorative surface of the ceiling material 22 of the system ceiling 20 is painted in plain white (no pattern) and has a large number of randomly arranged sound-absorbing recessed holes (not shown). On the other hand, the decorative surface of the suspended ceiling material 32 is printed with a black marble-like pattern (not shown) by inkjet printing. In other words, in this embodiment 1, the decorative surface of the ceiling material 22 of the system ceiling 20 and the decorative surface of the suspended ceiling material 32 are different in all of the color (white and black), pattern (presence or absence of marble-like pattern), and shape (presence or absence of recessed holes) of the decorative surface, resulting in different designs.

[0071] As described above, the ceiling surface C1 of the system ceiling 20 and the suspended ceiling surface C2 not only differ in installation height, but also in design. With this configuration, the suspended ceiling surface C2 is not only installed at a lower position than the ceiling surface C1 of the system ceiling 20, but also stands out in the space S because it has a striking black marble-like design in contrast to the plain white design of the ceiling surface C1 of the system ceiling 20. Therefore, people in the space S can easily find the suspended ceiling surface C2, which is installed at a lower position and has a striking design, and can easily recognize that the common area A2 is located below it, and conversely, can easily recognize that the personal work area A1 is located below the ceiling surface C1 of the system ceiling 20, which has a high ceiling height and an inconspicuous plain white design.

[0072] -Effects of the first embodiment- As described above, in the first embodiment, a plurality of suspended ceiling materials (plate-shaped bodies) 32, ..., 32 are suspended from the bar materials 6 of the system ceiling 20 by the suspension structure (suspending devices) 31, and the decorative surfaces of the plurality of suspended ceiling materials 32, ..., 32 form a suspended ceiling surface C2 below the system ceiling 20 that conceals a portion of the ceiling surface C1 of the system ceiling 20 that corresponds to the common area (specific area) A2. According to this configuration, in the common area A2, a suspended ceiling made up of the plurality of suspended ceiling materials 32, ..., 32 is provided below the system ceiling 20, forming a double ceiling structure. Then, people in the common area A2 cannot see the ceiling surface C1 of the system ceiling 20 above due to the suspended ceiling (plurality of suspended ceiling materials 32, ..., 32), and instead perceive the suspended ceiling surface C2 below the system ceiling 20 as the ceiling surface. Thus, according to the ceiling height changing structure 30 of this embodiment 1, in the system ceiling 20, the ceiling height can be partially lowered simply by hanging a suspended ceiling (multiple suspended ceiling materials 32, ..., 32) from the existing bar material 6, without having to redo the design and construction of the existing ceiling substructure 21.

[0073] Furthermore, in this embodiment 1, the suspended ceiling surface C2 is formed at a lower position than the ceiling surface C1 of the system ceiling 20, and therefore the suspended ceiling surface C2 is formed to correspond above and below the common area A2 (specific area), so that people below the system ceiling 20 can easily find the common area A2 (specific area) by looking for the suspended ceiling surface C2 formed at a lower position than the others. Therefore, according to the ceiling height adjustable structure 30 of this embodiment 1, the one-step lower suspended ceiling surface C2 allows people below the system ceiling 20 to easily find the location of the common area A2 (specific area).

[0074] Furthermore, in this embodiment 1, one of the personal work area A1 and the common area A2 in the office space, that is, the common area A2, is designated as a specific area, and the ceiling surface C1 of the system ceiling 20 directly above it is obscured by the suspended ceiling surface C2 and cannot be seen, while the ceiling surface C1 of the system ceiling 20 is visible in the other personal work area A1. In other words, according to the ceiling height adjustable structure 30 of this embodiment 1, the ceiling height of one of the personal work area A1 and the common area A2 (common area A2) in an office space where the system ceiling 20 is installed can be changed (lowered) without redoing the design and construction of the ceiling base 21 of the existing system ceiling 20. Furthermore, by changing (lowering) the ceiling height of one of the personal work area A1 and the common area A2 (common area A2) in this way, people below the system ceiling 20 can easily grasp the locations of the personal work area A1 and the common area A2.

[0075] Furthermore, in this embodiment 1, the ceiling material 32 (plate-like body) that forms the suspended ceiling surface C2 has a decorative surface design that is different from that of the ceiling material 22 (system ceiling material) of the system ceiling 20. Furthermore, since the multiple ceiling materials 32, ..., 32 are arranged so that the suspended ceiling surface C2 covers and conceals the portion of the ceiling surface C1 of the system ceiling 20 that corresponds to the specific area (common area A2), the design of the ceiling surface of the specific area (common area A2) is different from the design of the ceiling surface C1 of the system ceiling 20. In other words, according to the ceiling height adjustable structure 30 of this embodiment 1, in the system ceiling 20, not only can the ceiling height be partially lowered by simply suspending a suspended ceiling from the existing bar material 6 without having to redo the design and construction of the existing ceiling base, but the design of the ceiling surface can also be partially changed without damaging the aesthetic appearance of the ceiling.

[0076] Furthermore, in the present embodiment 1, the difference in design between the decorative surface of the suspended ceiling material 32 and the decorative surface of the ceiling material 22 of the system ceiling 20 is formed by the difference in color (black and white), pattern (marble pattern and no pattern), and shape (no recessed holes and with recessed holes). Therefore, the difference in design between the decorative surface of the suspended ceiling material 32 and the decorative surface of the ceiling material 22 of the system ceiling 20 can be easily formed.

[0077] The difference in design between the decorative surface of the suspended ceiling material 32 and the decorative surface of the ceiling material 22 of the system ceiling 20 may be formed by a difference in at least one of color, pattern, and shape, but by making all of the color, pattern, and shape different, as in this embodiment 1, the difference in design stands out, making the suspended ceiling surface C2 more noticeable.

[0078] Furthermore, in the present embodiment 1, one of the decorative surface of the suspended ceiling material 32 that forms the suspended ceiling surface C2 or the decorative surface of the ceiling material 22 of the system ceiling 20 that forms the ceiling surface C1 of the system ceiling 20 (the decorative surface of the suspended ceiling material 32) is a printed surface formed by inkjet printing. With this configuration, not only can patterns and the like be easily formed to create differences in design between the suspended ceiling surface C2 and the ceiling surface C1 of the system ceiling 20, but changes to the patterns and the like can also be made easily.

[0079] Furthermore, while inkjet ceiling materials with inkjet-printed surfaces can produce excellent designs, they are relatively expensive, and using this expensive inkjet ceiling material on the entire ceiling surface increases costs. However, as in the present embodiment 1, by effectively using this inkjet ceiling material only on a portion of the ceiling surface, namely, the suspended ceiling surface C2 (or only on the ceiling surface C1 of the system ceiling 20), without creating a sense of incongruity, the inkjet ceiling material can be used in conjunction with low-cost ceiling materials with patterns such as ordinary paint, thereby reducing the cost of the entire ceiling surface. In particular, by using the inkjet-printed ceiling material for visibility in a specific area (the common area A2 in the present embodiment 1), it becomes worthwhile to use the inkjet-printed ceiling material, even though it is expensive.

[0080] Furthermore, inkjet printing can be used to print patterns such as letters and figures in addition to marble-like and wood-grain patterns, and by printing these patterns on the decorative surface of the ceiling material using inkjet printing, there is also the advantage that the use of a specific area (common area A2 in this embodiment 1) can be more specifically identified.

[0081] As described above, according to the ceiling structure 10 equipped with the system ceiling 20 of this embodiment 1, by applying the above-mentioned ceiling height changing structure 30 to lower the ceiling height of a specific area (common area A2) in the space S below the system ceiling 20 below than other areas (personal work area A1), it is possible to partially lower the ceiling height in the system ceiling 20 without redoing the design and construction of the existing ceiling substructure 21, and further, the one-step lower suspended ceiling surface C1 makes it possible for people below the system ceiling 20 to easily grasp the location of the specific area (common area A2).

[0082] Second Embodiment of the Invention In the second embodiment, as shown in FIG. 8, a strip-shaped or other evacuation guidance area (evacuation guidance path) A3 is provided as a specific area in the space S below the system ceiling 20, and the ceiling height change structure 30 is applied to the evacuation guidance area A3, which is the specific area of ​​the space S.

[0083] Specifically, a plurality of suspended ceiling materials 32, ..., 32 are suspended by a suspension structure 31 from the ceiling base 21 (bar materials 6) of the system ceiling 20 in the evacuation guidance area A3, and the plurality of suspended ceiling materials 32, ..., 32 are arranged so that their decorative surfaces (undersides) form a suspended ceiling surface C2 below the system ceiling 20 that covers the portion of the ceiling surface C1 of the system ceiling 20 that corresponds to the evacuation guidance area A3. More specifically, the plurality of suspended ceiling materials 32, ..., 32 are arranged vertically and horizontally without any gaps directly above the evacuation guidance area A3 so as to correspond above and below the evacuation guidance area A3, with the end faces of adjacent suspended ceiling materials 32 abutting each other.

[0084] It should be noted that "multiple suspended ceiling materials 32, ..., 32 are positioned directly above the evacuation guidance area A3" does not limit the multiple suspended ceiling materials 32, ..., 32 to an exact vertical correspondence in terms of range, shape, etc. with the evacuation guidance area A3, but refers to the degree to which their positional relationship is related.

[0085] In this way, when the ceiling height adjustable structure 30 is applied to the evacuation guidance area A3, the ceiling structure 10 in the evacuation guidance area A3 becomes a double-ceiling structure comprising a system ceiling 20 and a suspended ceiling (plurality of suspended ceiling materials 32, ..., 32). Therefore, people in the evacuation guidance area A3 cannot see the ceiling surface C1 of the system ceiling 20 above it due to the suspended ceiling, and instead perceive the suspended ceiling surface C2 below the system ceiling 20 as the ceiling surface. In this way, by applying the ceiling height adjustable structure 30 to the evacuation guidance area A3, the ceiling height of the evacuation guidance area A3 can be lowered compared to other areas.

[0086] Furthermore, the ceiling height change structure 30 forms the suspended ceiling surface C2 at a position lower than the ceiling surface C1 of the system ceiling 20 so that it corresponds vertically to the evacuation guidance area A3, so that people in the space S (below the system ceiling 20) can easily find the suspended ceiling surface C2, which is formed at a lower position than the others, and can easily recognize that the area with a low ceiling height where the suspended ceiling surface C2 is provided is the evacuation guidance area A3.

[0087] 8, in the second embodiment, the design of the decorative surface of the ceiling material 22 of the system ceiling 20 is different from the design of the decorative surface of the suspended ceiling material 32. As a result, the design of the suspended ceiling surface C2 above the evacuation guidance area A3 is different from the design of the ceiling surface (ceiling surface C1 of the system ceiling 20) above the area other than the evacuation guidance area A3.

[0088] Furthermore, as shown in Fig. 8, in the second embodiment, graphics are written on the decorative surfaces of some of the suspended ceiling materials 32, and when a plurality of suspended ceiling materials 32, ..., 32 are installed, an arrow pattern is formed on the suspended ceiling surface C2 by the graphics written on the decorative surfaces of the plurality of ceiling materials 32. By adding such an arrow pattern, the evacuation direction is indicated. In the second embodiment as well, the decorative surface of the suspended ceiling surface C2 is formed by inkjet printing.

[0089] In this embodiment 2, the decorative surface of the ceiling material 22 of the system ceiling 20 is painted plain white (design without a pattern) and has a large number of randomly arranged sound-absorbing recessed holes (not shown). On the other hand, a plain gray background is printed by inkjet printing on the decorative surface of the suspended ceiling material 32, and on the decorative surface of some of the suspended ceiling materials 32, figures forming an arrow pattern are printed in a gray that is lighter than the background. In other words, in this embodiment 2 as well, the decorative surface of the ceiling material 22 of the system ceiling 20 and the decorative surface of the suspended ceiling material 32 are different in all of the color (white and black), pattern (presence or absence of arrow pattern), and shape (presence or absence of recessed holes) of the decorative surface, resulting in different designs.

[0090] As such, the ceiling surface C1 of the system ceiling 20 and the suspended ceiling surface C2 not only differ in installation height, but also in design. With this configuration, the suspended ceiling surface C2 is not only installed at a lower position than the ceiling surface C1 of the system ceiling 20, but also stands out in space S because it has a striking gray arrow pattern in contrast to the plain white design of the ceiling surface C1 of the system ceiling 20. Therefore, people in space S can easily find the suspended ceiling surface C2, which is installed at a lower position and has a striking design, and can easily recognize that the evacuation guidance area A3 is below it.

[0091] As described above, in the second embodiment, the ceiling surface C1 of the system ceiling 20 directly above the evacuation guidance area A3 (evacuation route) as a specific area is obscured by the suspended ceiling surface C2 and is therefore invisible, making it appear as if the ceiling surface of the evacuation guidance area A3 is composed of the suspended ceiling surface C2. Therefore, the ceiling height of the evacuation guidance area A3 (height from the floor or ground to the suspended ceiling surface) is lower than the ceiling heights of other areas (height from the floor or ground to the ceiling surface of the system ceiling 20). In other words, according to the second embodiment, the ceiling height of the evacuation guidance area A3 as a specific area can be changed (lowered) without redoing the design and construction of the ceiling base 21 of the existing system ceiling 20. Furthermore, by making the ceiling height of the evacuation guidance area A3 as a specific area lower than the other areas, people below the system ceiling 20 can easily determine the location of the evacuation guidance area A3.

[0092] Other Embodiments In the above-described first and second embodiments, the hanging device according to the present invention is configured with a hanging structure 31, and the hanging structure 31 is used to hang a plurality of suspended ceiling materials (plate-like bodies) 32, ..., 32 from the bar material 6. However, the hanging device according to the present invention is not limited to the above-described hanging structure 31. Any hanging device may be used as long as it can hang a plurality of suspended ceiling materials (plate-like bodies) 32, ..., 32 so that the decorative surfaces of the plurality of suspended ceiling materials (plate-like bodies) 32, ..., 32, form a suspended ceiling surface C2 below the system ceiling 20 that covers a portion corresponding to a specific area of ​​the ceiling surface C1 of the system ceiling 20. For example, wires may be attached to a plurality of locations (e.g., four corners) of each suspended ceiling material (plate-like body) 32, and the wires may be hooked onto S-shaped hooks or the like attached to the bar material 6, and the suspended ceiling materials 32 may be hung from the bar material 6 by these S-shaped hooks and wires. In such a case, the multiple suspended ceiling materials (plate-shaped bodies) 32, ..., 32 can be arranged so that the end faces of adjacent suspended ceiling materials abut or are close to each other, so that the ceiling surface C1 of the system ceiling 20 is covered by the multiple suspended ceiling materials (plate-shaped bodies) 32, ..., 32.

[0093] Furthermore, in the above-described first and second embodiments, some of the plurality of suspended ceiling materials 32 may be replaced with ceiling equipment (not shown), such as lighting fixtures and air conditioning equipment, to be installed in the system ceiling 20. For example, when a ceiling surface C2 formed by the plurality of suspended ceiling materials 32 is formed below the ceiling equipment installed in the system ceiling 20, the ceiling equipment fixed to the bar material 6 forming the access opening of the system ceiling 20 may be removed and attached to the suspended ceiling base 34 of the ceiling height adjustable structure 30 below, so that the ceiling equipment, such as a fire alarm or sprinkler, is installed so as to be exposed to the room on the ceiling surface C2 formed by the plurality of suspended ceiling materials 32 that conceals the ceiling surface C1 of the system ceiling 20. Note that the ceiling height adjustable structure 30 may be installed in a position that is not directly below the ceiling equipment so that the ceiling equipment is not hidden by the ceiling surface C2.

[0094] In addition, in the above embodiments 1 and 2, a separate lighting fixture may be provided in the space formed between the suspended ceiling consisting of a plurality of suspended ceiling materials 32, ..., 32 and the system ceiling 20, and light from the light source may be reflected by the ceiling surface C1 of the system ceiling 20 and made to enter below the suspended ceiling surface C2, and this indirect light may make the atmosphere of a specific area different from the atmosphere of other areas.

[0095] Furthermore, in the above-mentioned embodiments 1 and 2, the design of the decorative surface of the suspended ceiling material 32 is different from the design of the decorative surface of the ceiling material 22 of the system ceiling 20 in all respects of color, pattern, and shape, but the design of the decorative surface of the suspended ceiling material 32 is not limited to those of embodiments 1 and 2. The design of the decorative surface of the suspended ceiling material 32 only needs to be formed so as to differ from the design of the decorative surface of the ceiling material 22 of the system ceiling 20 in at least one of color, pattern, and shape, and may be a plain white design, similar to the ceiling material 22 of the system ceiling 20.

[0096] Furthermore, in the above-described first and second embodiments, the ceiling material 32, 22 on either the suspended ceiling surface C2 directly above the specific area of ​​the space S or the ceiling surface C1 of the system ceiling 20 directly above an area other than the specific area may have a wood grain pattern decorative surface. In this case, a wood grain pattern design is formed on one of the ceiling surfaces C1, C2. It is common to use a ceiling material with a plain decorative surface without a pattern. If the design distinction between the suspended ceiling surface C2 and the ceiling surface C1 of the system ceiling 20 were indicated by a color difference, it would be easier to see, but the color difference would be too noticeable and could create a sense of incongruity in the design. Therefore, as described above, by making one of the ceiling materials 32, 22 of the suspended ceiling material 32 and the ceiling material 22 of the system ceiling 20 a decorative surface with a wood grain pattern, a wood-like ceiling surface will appear partially on the ceiling surfaces C2, C1, and by changing the design of one of the suspended ceiling surface C2 and the ceiling surface C1 of the system ceiling 20 from the design of the other, it is possible to make the distinction easier to see, while still creating a ceiling surface with a design that does not look out of place.

[0097] Furthermore, in the first embodiment, the individual work area A1, rather than the common area A2, may of course be the specific area where the suspended ceiling surface C2 is formed.

[0098] Furthermore, in the above embodiments 1 and 2, a grid-type system ceiling 20 was described in which a plurality of bar materials 6, ..., 6 are arranged in the front-to-back and left-to-right directions and are arranged in a grid pattern in a plan view, but the system ceiling of the present invention may also be a line-type system ceiling in which a plurality of bar materials 6, ..., 6 are arranged in parallel in the front-to-back or left-to-right directions.

[0099] In the first and second embodiments, the bar material 6, the hanger 37, the siding support 39, and the siding 40 are formed by bending steel plates, but they may be made of any material that can ensure the strength required for each application. For example, the bar material 6, the hanger 37, the siding support 39, and the siding 40 may be made of extruded aluminum. [Industrial Applicability]

[0100] The present invention is useful for a ceiling height adjustable structure and a ceiling structure equipped with the same. [Explanation of symbols]

[0101] 1 Ceiling slab 6 Bar material 10 Ceiling structure 20 System ceiling 21 Ceiling underlayment 22 Ceiling materials (system ceiling materials) 30 Ceiling height change structure 31 Hanging structure (hanging device) 32 Suspended ceiling material A1 Individual work area A2 Common Area A3 Evacuation Guidance Area C1 Ceiling C2 Suspended ceiling surface

Claims

1. A ceiling height change structure for lowering the ceiling height of a specific area of ​​a space below a system ceiling, which has a ceiling substructure made of bar materials suspended from a ceiling slab and arranged in a parallel or lattice pattern, and a plurality of system ceiling materials supported by having their peripheral portions rest on the ceiling substructure, A plurality of plate-like bodies whose lower surfaces are decorative surfaces; a suspending tool attached to the bar material and the plurality of plate-like bodies to suspend the plurality of plate-like bodies from the bar material, The plurality of plate-like bodies are arranged so that decorative surfaces of the plurality of plate-like bodies form a suspended ceiling surface below the system ceiling that covers and conceals a portion of the ceiling surface of the system ceiling that corresponds to the specific area. A ceiling height adjustable structure.

2. The ceiling height adjustable structure according to claim 1, The space below the system ceiling is an office space having an individual work area where an individual works alone and a common area where multiple people work together, The suspended ceiling surface is formed with one of the individual work area and the common area as the specific area. A ceiling height adjustable structure.

3. The ceiling height adjustable structure according to claim 1, An evacuation route is provided as the specific area in the space below the system ceiling, The suspended ceiling surface is arranged so as to cover and conceal the portion of the system ceiling corresponding to the evacuation route. A ceiling height adjustable structure.

4. In the ceiling height adjustable structure according to any one of claims 1 to 3, The plate-like body has a different decorative surface design from the system ceiling material. A ceiling height adjustable structure.

5. The ceiling height adjustable structure according to claim 4, The decorative surface of the plate-like body and the decorative surface of the system ceiling material have different designs due to differences in at least one of color, pattern, and shape. A ceiling height adjustable structure.

6. The ceiling height adjustable structure according to claim 4, One of the plate-shaped body and the system ceiling material has a decorative surface with a wood grain pattern. A ceiling height adjustable structure.

7. The ceiling height adjustable structure according to claim 4, One decorative surface of the plate-like body and the system ceiling material is a printed surface formed by inkjet printing. A ceiling height adjustable structure.

8. A ceiling structure equipped with a system ceiling having a ceiling substrate in which bar materials suspended from a ceiling slab are arranged in parallel or in a grid pattern, and a plurality of system ceiling materials whose peripheral portions are supported by being placed on the ceiling substrate, The ceiling height adjusting structure according to any one of claims 1 to 3 is provided for lowering the ceiling height of a specific area in the space below the system ceiling compared to other areas. A ceiling structure characterized by:

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