Building ceiling structure

Abstract

To provide a ceiling structure of a building capable of improving an appearance of a ceiling portion.SOLUTION: In a building 10, a window portion 32 is provided in an outer wall 30. The building 10 has, as a ceiling structure, a low ceiling portion and a high ceiling portion that is provided along the window portion 32 and is higher than the low ceiling portion. The low ceiling portion is constituted of a first ceiling panel material 35, and the high ceiling portion is constituted of a second ceiling panel material 37 above the first ceiling panel material 35. A fold-up space 39 as a high ceiling space is formed above the low ceiling portion by the high ceiling portion. A curtain rail 40 and a lighting apparatus 46 are arranged in the fold-up space 39. A curtain 41 is suspended and supported by the curtain rail 40.SELECTED DRAWING: Figure 3

Description

Technical Field

[0006] , ,

[0007] , ,

[0001] The present invention relates to a ceiling structure of a building.

Background Art

[0002] Conventionally, a ceiling structure in which a curtain rail is arranged on the ceiling portion of a building having a window portion is known. For example, Patent Document 1 describes a configuration in which a curtain box is arranged in an upper portion of a living space adjacent to the window portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, if the curtain box is visible from below the ceiling, the appearance of the ceiling portion may be impaired.

[0005] The present invention has been made in view of the above circumstances, and a main object thereof is to provide a ceiling structure of a building that can improve the appearance of the ceiling portion.

Means for Solving the Problems

[0006] In order to solve the above problems, a ceiling structure of a building according to a first invention is a ceiling structure of a building having a window portion, and includes a low ceiling portion and a high ceiling portion provided along the window portion and higher than the low ceiling portion, and a curtain rail is arranged in a high ceiling space formed above the low ceiling portion by the high ceiling portion.

[0007] According to the present invention, the curtain rail is placed in the high-ceiling space, which is formed above the low-ceiling section by the high-ceiling section. In other words, the high-ceiling space is used as a curtain box. Therefore, compared to a configuration in which the curtain box is placed in the upper part of the living space adjacent to the window, the appearance of the ceiling can be simplified. As a result, the appearance of the area around the ceiling can be improved.

[0008] The ceiling structure of the building of the second invention is characterized in that, in the first invention, the building has a main ceiling beam and a pair of secondary ceiling beams that are installed spanning between the main ceiling beams, a first ceiling surface material which is the ceiling surface material of the low ceiling section is supported on the lower side of the secondary ceiling beam, and a second ceiling surface material which is the ceiling surface material of the high ceiling section is supported on the upper side of the secondary ceiling beam, and the high ceiling space is formed in a space that extends in the same direction as the secondary ceiling beam and is below the second ceiling surface material and above the first ceiling surface material.

[0009] According to the present invention, a high ceiling space can be suitably formed by utilizing ceiling beams, which are structural elements of the ceiling, and by using ceiling surface materials (first ceiling surface material, second ceiling surface material) provided on their lower and upper surfaces. Furthermore, curtain rails can be positioned along the window area within a desired range without interfering with the ceiling beams.

[0010] The ceiling structure of the third invention is characterized in that, in the first invention, it is provided parallel to the window portion between the first ceiling surface material, which is the ceiling surface material of the low ceiling portion, and the second ceiling surface material, which is the ceiling surface material of the high ceiling portion, and has a side wall portion that partitions the high ceiling space, the first ceiling surface material protrudes toward the high ceiling space side from the side wall portion, and lighting equipment is arranged above the protruding portion.

[0011] According to the present invention, the high ceiling space serves not only as a space for arranging curtain rails but also as a space for arranging lighting equipment. In particular, since the first ceiling surface material protrudes further into the high ceiling space than the side wall, and lighting equipment is positioned above this protruding portion, indirect lighting by the lighting equipment becomes possible, and the indirect lighting is further highlighted by the illumination directed upwards towards the curtains.

[0012] The ceiling structure of the building of the fourth invention is characterized in that, in the third invention, a partitioned room is formed on the opposite side of the high ceiling space, separated by the first ceiling surface material and the second ceiling surface material, and the power supply device for the lighting equipment is located in the partitioned room.

[0013] In the present invention, by using a first ceiling surface material for the low ceiling area and a second ceiling surface material for the high ceiling area, a partitioned room can be formed on the opposite side of the high ceiling space, separated by a side wall, in the vertical direction. In this case, by using the partitioned room to arrange the power supply unit for the lighting equipment, the lighting equipment and power supply unit can be suitably arranged even if the high ceiling space is a narrow space.

[0014] The building ceiling structure of the fifth invention is characterized in that, in the first invention, it is provided parallel to the window portion between the first ceiling surface material, which is the ceiling surface material of the low ceiling portion, and the second ceiling surface material, which is the ceiling surface material of the high ceiling portion, and has a side wall portion that partitions the high ceiling space, and a partitioned room is formed on the opposite side of the high ceiling space with the side wall portion in between, partitioned by the first ceiling surface material and the second ceiling surface material, and a curtain drive device for opening and closing curtains suspended from the curtain rail is arranged in the partitioned room.

[0015] According to the present invention, a partitioned room is used as a space for arranging a curtain drive device to motorize the opening and closing of curtains. As a result, the appearance of the ceiling can be kept simple while improving the convenience of the residents.

[0016] Here, it is conceivable to create a large indoor space and then form relatively large windows in the exterior wall that separates this indoor space from the outside. In this case, it may be necessary to position curtain rails corresponding to the windows so as to cross the main ceiling beams of the building.

[0017] Therefore, the ceiling structure of the building of the sixth invention is characterized in that, in the first invention, the high ceiling space extends in a direction intersecting the main ceiling beam and is formed in a range that straddles the main ceiling beam, the main ceiling beam that intersects the high ceiling space has a penetration portion that penetrates the main ceiling beam in the width direction, and the curtain rail is arranged in the high ceiling space through the penetration portion.

[0018] According to the present invention, a through-hole is formed in the main ceiling beam that intersects with the high ceiling space, penetrating the beam in the width direction. The curtain rail is placed in the high ceiling space by passing through this through-hole. This makes it possible to position the curtain rail to accommodate relatively large window areas.

[0019] Alternatively, windows could be placed in two intersecting exterior walls, forming relatively large window sections across each exterior wall.

[0020] Therefore, the ceiling structure of the building of the seventh invention is characterized in that, in the first invention, the window portion is provided on two intersecting exterior wall portions, the high ceiling space extends along each of the exterior wall portions and is formed in a range that includes an outer corner or inner corner formed by each of the exterior wall portions, and the curtain rail is arranged from one side to the other of the wall portions via the outer corner or inner corner.

[0021] According to the present invention, a high ceiling space is formed corresponding to each intersecting exterior wall. This allows for the placement of curtain rails to accommodate relatively large windows. [Brief explanation of the drawing]

[0022] [Figure 1]Perspective view showing the outline of the unit building. [Figure 2] Perspective view of the building unit. [Figure 3] Vertical sectional view showing the second - floor part of the building. [Figure 4] Plan view of the second - floor part of the building. [Figure 5] Plan view of the second - floor part of the building according to another embodiment. [Figure 6] Cross - sectional view of the ceiling girder. [Figure 7] Plan view showing the structure of the building according to another embodiment.

Mode for Carrying Out the Invention

[0023] Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. Note that FIG. 1 is a perspective view showing the outline of the unit building.

[0024] As shown in FIG. 1, the building 10 includes a building main body 12 provided on a foundation 11 and a roof part 13 provided above it. The building main body 12 is a two - story building having a first - floor part 14 as a lower floor and a second - floor part 15 as an upper floor, and is composed of a plurality of building units 20 connected to each other. The building units 20 are pre - manufactured in a manufacturing factory and then transported to the construction site by a truck or the like.

[0025] FIG. 2 shows a perspective view of the building unit 20. As shown in FIG. 2, the building unit 20 includes four columns 21 arranged at its four corners, and four ceiling girders 22 and four floor girders 23 that connect the upper and lower ends of each column 21, respectively. And a rectangular parallelepiped - shaped skeleton (frame) is formed by these columns 21, ceiling girders 22, and floor girders 23. The columns 21 are made of square tube - shaped square steel. The ceiling girders 22 and floor girders 23 are made of channel steel with a U - shaped cross - section, and are installed such that their openings face each other.

[0026] Multiple ceiling joists 25 are spanned at predetermined intervals between opposing ceiling joists 22 on the long side of the building unit 20. Similarly, multiple floor joists 26 are spanned at predetermined intervals between opposing floor joists 23 on the long side of the building unit 20. The ceiling joists 25 and floor joists 26 are installed at equal intervals and in corresponding positions vertically. For example, the ceiling joists 25 are made of lip channel steel, and the floor joists 26 are made of square steel. The ceiling surface material is supported by the ceiling joists 25, and the floor surface material 27 is supported by the floor joists 26.

[0027] Next, the second floor 15 of building 10 will be described based on Figure 3. Figure 3 is a longitudinal cross-sectional view showing the second floor 15 of building 10.

[0028] Building 10 has an exterior wall 30 that separates the interior (inside building 10) from the exterior. The exterior wall 30 is attached to the frame of building unit 20. A ceiling beam 22 is shown here, and the upper end of the exterior wall 30 is attached to the ceiling beam 22.

[0029] A roof section 13 is provided above the second floor section 15. A roof support section 31 is provided on the upper flange of the main ceiling beam 22, and the roof section 13 is supported above the main ceiling beam 22 via the roof support section 31. In the roof section 13, the lower end in the direction of the slope protrudes outward from the exterior wall 30, forming an eaves section.

[0030] A window section 32 is formed in the exterior wall 30. The window section 32 is, for example, a sliding door, and a glass door 33 is provided in the window section 32. In this case, it is possible to bring sunlight into the living space 34, which is indoors, through this window section 32.

[0031] Here, it is conceivable to place a curtain box in the upper part of the living space 34 adjacent to the window 32. However, if the curtain box is visible from the living space 34, the appearance of the ceiling may be spoiled. Therefore, in this embodiment, the following configuration is provided in order to improve the appearance of the ceiling.

[0032] The ceiling of the second floor 15 has a low ceiling section and a high ceiling section that is located along the window section 32 and is higher than the low ceiling section. The high ceiling section creates a high ceiling space above the low ceiling section. The low ceiling section, high ceiling section, and high ceiling space will be described below.

[0033] As explained in Figures 1 and 2 above, the building unit 20 has multiple ceiling joists 25 spanning between a pair of opposing ceiling main beams 22. The vertical dimension (height dimension) of the ceiling joists 25 is smaller than the vertical dimension (height dimension) of the ceiling main beams 22, specifically about one-third of the vertical dimension of the ceiling main beams 22. The lower surface of the ceiling joists 25 is set at the same height as the lower surface of the ceiling main beams 22.

[0034] A first ceiling panel 35, which is the ceiling panel material for the low ceiling section, is supported on the underside of the ceiling beam 25. In this embodiment, a furring strip 36 is attached to the underside of the ceiling beam 25. The furring strip 36 is provided along the ceiling beam 25. The first ceiling panel 35 is attached to the underside of the furring strip 36 with screws or the like. For example, the first ceiling panel 35 is a gypsum board made of two layers stacked together. The ceiling surface formed by the first ceiling panel 35 corresponds to a ceiling surface of normal height.

[0035] A second ceiling panel 37, which is the ceiling panel material for the high ceiling section, is supported on the upper side of the ceiling joist 25. In this embodiment, a base material 38A is attached to the upper surface of the lower flange of the main ceiling beam 22, and a base material 38B is attached to the upper surface of the ceiling joist 25. The base material 38A is provided along the main ceiling beam 22, and the base material 38B is provided along the ceiling joist 25. The upper surfaces of each base material 38A and 38B are set at the same height, and the second ceiling panel 37 is attached to each base material 38A and 38B with screws or the like. For example, the second ceiling panel 37 is a gypsum board made of two layers stacked together.

[0036] In this case, a recessed space 39 is formed that extends in the same direction as the ceiling beam 25 and is located below the second ceiling panel 37 and above the first ceiling panel 35. This recessed space 39 corresponds to the "high ceiling space". A curtain rail 40 is placed in the recessed space 39. In this embodiment, a ceiling finishing material 42, such as wooden plywood, is attached to the lower surface of the second ceiling panel 37. The curtain rail 40 is attached to the second ceiling panel 37 via the ceiling finishing material 42.

[0037] The space below the curtain rail 40 within the recessed space 39 is designated as a space where the first ceiling panel 35 is not installed. In other words, the recessed space 39 is designated as a space connected to the living space 34. The curtain rail 40 is provided with a runner that moves along the curtain rail 40, and the upper end of the curtain 41 is connected to the runner. As a result, the curtain 41 is supported by the curtain rail 40 while suspended.

[0038] A side wall portion 43 is provided between the first ceiling surface material 35 and the second ceiling surface material 37, parallel to the window portion 32, and demarcating the recessed space 39. The side wall portion 43 is provided at an intermediate position between the ceiling joist 25 and the ceiling main beam 22 in the direction toward the window portion 32 from the ceiling joist 25. In this embodiment, the side wall portion 43 is provided at a position near the center between the ceiling joist 25 and the ceiling main beam 22. The side wall portion 43 is, for example, made of wooden plywood and extends along the ceiling joist 25.

[0039] The side wall portion 43 may be positioned on the side of the window portion 32 or on the opposite side of the window portion 32, rather than near the center between the ceiling joist 25 and the ceiling main beam 22. By adjusting the position of the side wall portion 43 in the direction from the ceiling joist 25 toward the window portion 32, the size of the folded-up space 39 can be set.

[0040] The first ceiling panel 35 extends beyond the side wall 43 towards the recessed space 39, and a top surface 45, which is made of wooden plywood, is attached to the upper surface of the protruding portion 44. The side wall 43 is fixed to the first ceiling panel 35 at its lower end via the top surface 45. The side wall 43 is also fixed to the second ceiling panel 37 at its upper end via the ceiling finishing material 42. The ceiling finishing material 42 only needs to be attached to the second ceiling panel 37 up to the position where the side wall 43 is provided. The top surface 45 only needs to be attached to the first ceiling panel 35 up to the position where the side wall 43 is provided.

[0041] On the opposite side of the folded-up space 39, separated by the side wall 43, a compartment 47 is formed, partitioned by the first ceiling panel 35, the second ceiling panel 37, and the side wall 43. The compartment 47 is a space isolated from the living space 34.

[0042] A ceiling insulation material 16 is provided in the space formed between the roof section 13 and the first ceiling panel 35 or the second ceiling panel 37. The ceiling insulation material 16 is a fibrous insulation material such as glass wool, and is provided so as to cover the first ceiling panel 35 and the second ceiling panel 37 from above.

[0043] Next, in addition to Figure 3, Figure 4 will be used to explain the retracted space 39 and the partitioned room 47. Figure 4 is a floor plan of the second floor 15 of the building 10.

[0044] In the recessed space 39, lighting fixtures 46, for example, having LEDs (light-emitting diodes) as light sources, are positioned above the overhanging portion 44 of the first ceiling surface material 35. In this embodiment, the lighting fixtures 46 are positioned above the overhanging portion 44 of the first ceiling surface material 35 by being attached to the side wall portion 43. Multiple lighting fixtures 46 are arranged at predetermined intervals (for example, at equal intervals) in the longitudinal direction of the side wall portion 43 (in other words, the longitudinal direction of the ceiling beam 25).

[0045] In the compartment 47, a power supply unit 48 is positioned above the first ceiling panel 35 to supply power to the lighting fixtures 46. The power supply unit 48 is an electrical device, for example, including a transformer. Each of the lighting fixtures 46 is connected to wiring 49. These wires 49 are routed into the compartment 47 through wiring holes formed in a side wall 43 (not shown) and connected to the power supply unit 48.

[0046] Furthermore, in the compartment 47, a curtain drive device 50 is provided to move the runner of the curtain rail 40 along the curtain rail 40. The curtain drive device 50 includes an electric motor, and the runner moves along the curtain rail 40 as the electric motor is driven. This allows the curtain 41 to be opened and closed electrically.

[0047] Alternatively, instead of arranging multiple lighting fixtures 46 at predetermined intervals along the longitudinal direction of the side wall 43, linearly extending lighting fixtures may be arranged along the longitudinal direction of the side wall 43. Furthermore, the lighting fixtures are not limited to those using LEDs as light sources; they may also be fluorescent lamps, incandescent lamps, etc.

[0048] Instead of being attached to the side wall portion 43, the lighting fixture 46 may be attached to the upper side of the protruding portion 44 of the first ceiling surface material 35. Specifically, the lighting fixture 46 may be attached to the upper portion 45.

[0049] The protruding portion 44 and the tip of the upper portion 45 of the first ceiling panel 35 may be covered with a cushioning member 51. For example, as shown in Figure 3, a sheet-like cushioning member 51 may be attached to the first ceiling panel 35 and the upper portion 45 with an adhesive or the like. The cushioning member 51 should be made of a flexible material such as rubber or synthetic resin to prevent the curtain 41 from rubbing against the first ceiling panel 35 and the upper portion 45 and damaging the curtain 41. This can reduce interference between the curtain 41 and the first ceiling panel 35 and the upper portion 45.

[0050] As described in detail above, the configuration of this embodiment provides the following excellent effects.

[0051] In this embodiment, the curtain rail 40 is placed in the folded-up space 39. In other words, the folded-up space 39 is used as a curtain box. Therefore, compared to a configuration in which the curtain box is placed in the upper part of the living space adjacent to the window, the appearance of the ceiling can be simplified. As a result, the appearance of the area around the ceiling can be improved.

[0052] According to this embodiment, the ceiling beam 25, which is a structural element of the ceiling, can be used to form a suitable recessed space 39 and partitioned room 47 using the first ceiling surface material 35 and the second ceiling surface material 37 provided on the lower and upper sides of the beam. Furthermore, the curtain rail 40 can be positioned along the window section 32 within a desired range without interfering with the ceiling beam 25.

[0053] In this embodiment, the folded-up space 39 serves not only as a space for arranging the curtain rail 40, but also as a space for arranging the lighting equipment 46. In particular, since the first ceiling surface material 35 protrudes further towards the folded-up space 39 than the side wall portion 43, and the lighting equipment 46 is positioned above this protruding portion 44, indirect lighting by the lighting equipment 46 is possible, and the illumination directed upwards from the curtain 41 makes the indirect lighting stand out.

[0054] With the first ceiling panel 35 and the second ceiling panel 37, a compartment 47 can be formed vertically on the opposite side of the folded-up space 39, with the side wall 43 in between. In this case, by using the compartment 47 to arrange the power supply unit 48 and wiring 49 associated with the lighting equipment 46, the lighting equipment 46 can be suitably arranged even if the folded-up space 39 is a narrow space.

[0055] The partitioned room 47 is used as the space for arranging the curtain drive device 50 to motorize the opening and closing of the curtain 41. As a result, the appearance of the ceiling can be kept simple while improving the convenience of the residents.

[0056] The second ceiling panel 37 (ceiling panel for the high ceiling section) is extended from above the coffered space 39 to above the compartment 47, and the ceiling insulation material 16 is placed above the second ceiling panel 37. In this configuration, not only the coffered space 39 but also the compartment 47 can be isolated from the ceiling insulation material 16, and sufficient space can be secured within the compartment 47 for the power supply unit 48, curtain drive unit 50, etc. In other words, unlike a configuration in which the power supply unit 48, curtain drive unit 50, etc. are simply placed in the space above the ceiling, it is possible to isolate the equipment from the ceiling insulation material 16.

[0057] The present invention is not limited to the embodiments described above, and may be implemented, for example, as follows.

[0058] (1) The folded-up space 39 and the partitioned room 47 may be formed across multiple building units 20, rather than being formed to fit within a single building unit 20.

[0059] Figure 5 is a plan view of two building units 20 arranged with their girder faces facing each other. In Figure 5, components identical to those shown in Figure 4 are denoted by the same reference numerals for convenience.

[0060] By connecting each building unit 20, a large living space 34 can be formed, and relatively large windows can be formed in the exterior wall that divides the living space 34 into indoor and outdoor areas. In this case, it may be necessary to position a curtain rail 40 corresponding to the window so as to cross the main ceiling beam 22 of the building unit 20. In this embodiment, the recessed space 39 and the partitioned room 47 are formed on the gable end of the building unit 20 in a direction that intersects the main ceiling beam 22 and spans a pair of opposing main ceiling beams 22a. In other words, the main ceiling beams 22a intersect the recessed space 39 and the partitioned room 47.

[0061] Figure 6 is a cross-sectional view obtained by cutting one of a pair of opposing ceiling beams 22a with a plane parallel to the girder surface of the building unit 20. The ceiling beam 22a has a penetration portion 52 that goes through it. The penetration portion 52 of the ceiling beam 22a is formed to penetrate below the center of the web of the ceiling beam 22a in the vertical direction. In other words, the penetration portion 52 of the ceiling beam 22a opens on the lower side of the ceiling beam 22a. The penetration portion 52 of the ceiling beam 22a is formed with a width sufficient to accommodate a curtain rail 40 and a curtain 41 in a direction parallel to the girder surface. The curtain rail 40 and ceiling finishing material 42 are placed in the recessed space 39 by passing through the penetration portion 52 of the ceiling beam 22a. In the above configuration, a portion of the pair of opposing ceiling beams 22a is missing, so it is desirable that structural reinforcement be carried out in the missing portion.

[0062] According to this embodiment, the main ceiling beam 22a that intersects with the folded-up space 39 has a through-hole 52 that penetrates the main ceiling beam 22a. The curtain rail 40 passes through the through-hole 52 and is placed in the folded-up space 39. This makes it possible to position the curtain rail 40 to accommodate relatively large window sections.

[0063] (2) The raised space (high ceiling space) may be formed continuously in an area that includes the outer corner or inner corner of the building 10. A specific configuration is shown in Figure 7. In Figure 7, the raised space 39 and the partitioned room 47 are formed along the gable and beam surfaces of the building unit 20. In Figure 7, the same reference numerals are used for components that are the same as those shown in Figure 4 for convenience.

[0064] In Figure 7, the first exterior wall 61 and the second exterior wall 62 of the building 10 extend in directions that intersect each other, and these exterior walls 61 and 62 form an external corner 63. Each exterior wall 61 and 62 is provided with a window. However, the window is not shown in this figure. The recessed space 39 extends along the first exterior wall 61 and the second exterior wall 62 and is formed in a range that includes the external corner 63. In other words, the recessed space 39 is formed continuously from the side of the first exterior wall 61 to the side of the second exterior wall 62 via the external corner 63. Accordingly, the curtain rail 40 can be positioned in the recessed space 39 from the side of the first exterior wall 61 to the side of the second exterior wall 62 via the external corner 63. The partitioned room 47 only needs to be formed along the recessed space 39.

[0065] According to the above configuration, the curtain rail 40 can be suitably positioned to accommodate relatively large windows. Furthermore, in a configuration where the curtain rail 40 is installed across two exterior walls 61 and 62, the corner pillars are hidden when the curtains are drawn (curtain closed), which creates the impression of a larger indoor space compared to when the corner pillars are visible.

[0066] Alternatively, instead of forming a folded-up space in an area including the outer corner 63 formed by the two outer walls 61 and 62, the folded-up space may be formed in an area including the inner corner formed by the two outer walls 61 and 62. In this case, the curtain rail should be positioned in the folded-up space, extending from one of the two intersecting outer walls to the other via the inner corner.

[0067] (3) The first ceiling panel 35 that separates the compartment 47 from the living space 34 may be provided with an opening / closing section that allows access to the compartment 47 from the living space 34 side.

[0068] (4) In the recessed space 39 (high ceiling space), lighting fixtures 46 may not be installed, and only curtain rails 40 may be provided.

[0069] (5) The ceiling portion of the first floor 14 of the building 10, that is, the space between the first and second floors, may be configured to have a raised space 39 (high ceiling space) in which a curtain rail 40 or the like may be provided.

[0070] (6) The building is not limited to a modular building, but may also be a building constructed using traditional wooden construction methods or a building constructed using steel frame construction methods. Even in these buildings, it is preferable to have a high ceiling section along the window area, and to have a configuration in which a curtain rail is placed in the high ceiling space formed by that high ceiling section. [Explanation of Symbols]

[0071] 10...Building, 32...Window area, 39...Recessed space, 40...Curtain rail.

Claims

1. In a building having windows, the ceiling structure includes a main ceiling beam and a secondary ceiling beam that is installed in a manner spanning between a pair of the main ceiling beams, It has a low ceiling section and a high ceiling section that is provided along the window section and is higher than the low ceiling section. A curtain rail is installed in the high-ceiling space formed above the low-ceiling section by the aforementioned high-ceiling section. The first ceiling panel, which is the ceiling panel for the low ceiling section, is supported on the lower side of the ceiling beam, and the second ceiling panel, which is the ceiling panel for the high ceiling section, is supported on the upper side of the ceiling beam. The ceiling structure of a building is characterized in that the high ceiling space includes a space that extends in the same direction as the ceiling beams and is located below the second ceiling surface material and above the first ceiling surface material.

2. A ceiling structure of a building having a window, It has a low ceiling section and a high ceiling section that is provided along the window section and is higher than the low ceiling section. A curtain rail is installed in the high-ceiling space formed above the low-ceiling section by the aforementioned high-ceiling section. Between the first ceiling surface material, which is the ceiling surface material for the low ceiling section, and the second ceiling surface material, which is the ceiling surface material for the high ceiling section, the side wall portion is provided parallel to the window section and partitions the high ceiling space. The first ceiling panel extends beyond the side wall portion towards the high ceiling space, and lighting equipment is positioned above the protruding portion. A building ceiling structure characterized in that a partitioned room is formed on the opposite side of the high ceiling space, separated by the first ceiling surface material and the second ceiling surface material, and the power supply unit for the lighting equipment is located in the partitioned room.

3. A ceiling structure of a building having a window, It has a low ceiling section and a high ceiling section that is provided along the window section and is higher than the low ceiling section. A curtain rail is installed in the high-ceiling space formed above the low-ceiling section by the aforementioned high-ceiling section. Between the first ceiling surface material, which is the ceiling surface material for the low ceiling section, and the second ceiling surface material, which is the ceiling surface material for the high ceiling section, the side wall portion is provided parallel to the window section and partitions the high ceiling space. A building ceiling structure characterized in that a partitioned room is formed on the opposite side of the high ceiling space, separated by the first ceiling surface material and the second ceiling surface material, and a curtain drive device for opening and closing curtains suspended from the curtain rail is arranged in the partitioned room.

4. A ceiling structure of a building having a window, It has a low ceiling section and a high ceiling section that is provided along the window section and is higher than the low ceiling section. A curtain rail is installed in the high-ceiling space formed above the low-ceiling section by the aforementioned high-ceiling section. The aforementioned high ceiling space extends in a direction intersecting the main ceiling beams and is formed in a range that straddles the main ceiling beams. The ceiling beam that intersects with the aforementioned high ceiling space has a through-hole formed therein that penetrates the ceiling beam in the width direction. The ceiling structure of a building is characterized in that the curtain rail is arranged in the high ceiling space through the penetration portion.

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