System ceiling

Abstract

To provide a T-bar and a system ceiling allowing construction work to be simplified further.SOLUTION: A first cross T-bar 3 is applied on a system ceiling 1. The first cross T-bar 3 comprises a long body, first joint parts 33 provided on both ends of the body in a longitudinal direction, and a plurality of second joint parts 34 provided on a side surface of the body and capable of being connected to first joint parts 43 of a second cross T-bar 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to S For more details on stem ceilings, T This relates to system ceilings including bars. [Background technology]

[0002] As a conventional example, the system ceiling described in Patent Document 1 is exemplified. The system ceiling described in Patent Document 1 has a first T-bar, a second T-bar, and a joiner that joins the first T-bar and the second T-bar. In the system ceiling described in Patent Document 1, the end of the second T-bar is joined to the side of the first T-bar via the joiner. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-3364 A Summary of the Invention [Problem to be solved by the invention]

[0004] Meanwhile, at construction sites of system ceilings, there is a demand for further simplification of construction work for the system ceiling and T-bars (first T-bar, second T-bar) described in Patent Document 1, which use joiners.

[0005] The object of the present disclosure is to further simplify the construction work. S The aim is to provide a stem ceiling. [Means for solving the problem]

[0007] A system ceiling according to one embodiment of the present disclosure includes: The plurality of types of T bars are provided. The plurality of types of T bars are providedThe system ceiling has a plurality of main T-bars installed in parallel at regular intervals, and a plurality of first cross T-bars connected to the plurality of main T-bars so as to intersect with the plurality of main T-bars. The system ceiling has a plurality of second cross T-bars connected to the plurality of first cross T-bars so as to intersect with the plurality of first cross T-bars and to be parallel to the plurality of main T-bars. The multiple types of T-bars, including the main T-bar, the first cross T-bar, and the second cross T-bar, have a long main body, first connecting parts provided at both ends of the main body in the longitudinal direction, and multiple second connecting parts provided on the side of the main body, the second connecting parts being provided at the ends of other T-bars that cross the T-bar and capable of being connected to connecting parts having the same structure as the first connecting parts. The main body has a long, flat main part. The second connecting parts have a semi-cylindrical insertion part protruding from the side of the main body and a protruding piece protruding from the side of the main body in the same direction as the insertion part. The first connecting part is provided on the side of the main body of the other T-bar that crosses the T-bar, and has a mating piece that is inserted into the insertion part of a connecting part having the same structure as the second connecting part. A groove is provided at the tip of the mating piece, and a protruding piece of a connecting part having the same structure as the second connecting part, provided on the side of the main body of the other T-bar that crosses the T-bar, is fitted into the groove. Effect of the Invention

[0008] The present disclosure S The stem ceiling has the advantage of further simplifying construction work. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a ceiling frame of a system ceiling according to an embodiment of the present disclosure, viewed obliquely from above. [Diagram 2] FIG. 2 is a perspective view of the ceiling frame as viewed obliquely from below. [Diagram 3] FIG. 3 is a perspective view of the above system ceiling as viewed from below. [Figure 4] FIG. 4 is a perspective view of a T-bar (first cross T-bar) according to an embodiment of the present disclosure. [Diagram 5] Fig. 5A is a front view of the first cross T-bar of the same, Fig. 5B is a bottom view of the same, and Fig. 5C is an enlarged view of the part surrounded by the dashed line in Fig. 5B. [Figure 6] FIG. 6 is a side view of the first cross T-bar. [Figure 7] FIG. 7 is a perspective view of the joint between the first cross T-bar and the main T-bar as viewed from above. [Figure 8] FIG. 8 is a perspective view of the joint between the first cross T-bar and the main T-bar as viewed from below. [Figure 9] FIG. 9 is a perspective view of the first cross T-bar and the main T-bar before they are joined together, as viewed from above. [Figure 10]FIG. 10 is a perspective view of the first cross T-bar and the main T-bar before they are joined together, as viewed from below. [Figure 11] FIG. 11 is a bottom view of the joint between the first cross T-bar and the main T-bar. [Figure 12] FIG. 12 is a bottom view of the joint between the first cross T-bar and the second cross T-bar. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The T-bar and system ceiling according to the embodiment of the present disclosure will be described in detail below with reference to the drawings. However, each figure described in the following embodiment is a schematic diagram, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. Note that the configuration described in the following embodiment is only one example of the present disclosure. The present disclosure is not limited to the following embodiment, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0011] (Overview of the system ceiling according to the embodiment) A system ceiling 1 according to the embodiment (hereinafter, abbreviated as system ceiling 1) has a plurality of T-bars connected in a lattice shape, and a plurality of ceiling panels 12 formed in a quadrilateral flat plate shape, each of whose four sides is supported by a plurality of T-bars, as shown in Figures 1 to 3. The system ceiling 1 also has a plurality of types of equipment, such as lighting fixtures 5 and air conditioning outlets (see Figure 3).

[0012] The multiple T-bars include multiple main T-bars 2, multiple first cross T-bars 3, and multiple second cross T-bars 4 (see Figures 1 and 2).

[0013] The multiple main T-bars 2 are supported by multiple suspension bolts 11 so as to be aligned parallel to one another at a fixed interval D1. Specifically, each main T-bar 2 is connected to each of the multiple suspension bolts 11 by multiple T-hangers 10 attached to each of the multiple suspension bolts 11 embedded in the ceiling slab of the building. Each of the multiple T-hangers 10 is screwed to a corresponding one of the multiple suspension bolts 11, and is attached to the main T-bar 2 so as to sandwich the upper end (main portion 21) of the main T-bar 2 from its width direction.

[0014] Each of the multiple first cross T-bars 3 intersects (is perpendicular to) the multiple main T-bars 2 and is supported by the two main T-bars 2 so as to be arranged parallel to each other with a constant interval D2 (D2=D1 / 2) therebetween.

[0015] Each of the multiple second cross T-bars 4 is connected to two first cross T-bars 3 so as to be parallel to the multiple main T-bars 2 and intersect (orthogonal) with the multiple first cross T-bars 3. Since the basic structure of these three types of T-bars is the same, the basic structure of the first cross T-bar 3 will be described as a representative of the three types of T-bars with reference to Figures 4 to 6.

[0016] The first cross T-bar 3 has a main body 30, a main portion 31, and a bottom portion 32 as a basic structure. The main body 30 is formed in a long flat plate shape. The main portion 31 is formed in a hollow rectangular prism shape with both ends in the longitudinal direction open. The main portion 31 is connected to the upper end of the main body 30 in the lateral direction (up and down direction) at the center of the lateral direction of the lower surface (see FIG. 6). The bottom portion 32 is formed in a hollow rectangular prism shape as a whole, and is connected to the lower end of the main body 30 in the lateral direction at the center of the lateral direction of the upper surface. However, a rectangular opening 320 is provided along the longitudinal direction of the bottom portion 32 at the center of the lateral direction of the lower surface of the bottom portion 32 (see FIG. 6). The ends 322 on both sides in the longitudinal direction of the bottom portion 32 are each formed in a trapezoid shape inclined at an angle of 45° toward the longitudinal tip of the bottom portion 32 and approaching the opening 320 (see FIG. 5B). In the following description, the body, main portion, bottom portion and opening of the main T-bar 2 will be referred to as body 20, main portion 21, bottom portion 22 and opening portion 220, respectively. Similarly, the body, main portion, bottom portion, opening portion and end portion of the bottom of the second cross T-bar 4 will be referred to as body 40, main portion 41, bottom portion 42, opening portion 420 and end portion 422 of bottom 42, respectively.

[0017] Each of the ceiling panels 12 is formed into a square (or rectangular) flat plate shape using a plate material such as gypsum board or wood (see FIG. 3). The four side surfaces of the ceiling panel 12 have steps along the thickness direction (up-down direction) of the ceiling panel 12. In the following description, the portion of the periphery of the ceiling panel 12 that is narrower in the thickness direction than the central portion of the ceiling panel 12 due to the steps of each side surface of the ceiling panel 12 is referred to as the peripheral portion. Each ceiling panel 12 is inserted into a square (or rectangular) hole surrounded by four T bars (one main T bar 2, two first cross T bars 3, and one second cross T bar 4), and is supported by the four T bars such that the peripheral portions of the edges of the four sides are placed on the bottoms of the four T bars surrounding the hole. In other words, the hole surrounded by the four T bars is blocked by the ceiling panel 12 (see FIG. 3). However, instead of the ceiling panel 12, lighting fixtures, air conditioning outlets, and other equipment may be inserted into the holes and supported by the four T-bars.

[0018] (Description of T-bar according to embodiment) The T-bar according to the embodiment of the present disclosure is a first cross T-bar 3 among three types of T-bars.

[0019] In addition to the basic structure described above, the first cross T-bar 3 has a pair of first connecting parts 33, one on each end of the main body 30 in the longitudinal direction, and a plurality of second connecting parts 34, which are provided on the side of the main body 30 and can be connected to the first connecting parts 33 (FIG. 4). However, the pair of first connecting parts 33 of the first cross T-bar 3 are each connected to the second connecting parts 24 (connecting parts having the same structure as the second connecting parts 34 of the first cross T-bar 3) of the main T-bar 2 (see FIGS. 7 and 8). Similarly, the plurality of second connecting parts 34 of the first cross T-bar 3 are each connected to the first connecting parts 43 (connecting parts having the same structure as the first connecting parts 33 of the first cross T-bar 3) of the second cross T-bar 4 (see FIG. 1).

[0020] The first connecting portion 33 has a rectangular fixing piece 330 and a fitting piece 331 protruding from one side of the fixing piece 330 in the thickness direction of the fixing piece 330. The first connecting portion 33 has a pair of eyelets 332 protruding from the surface of the fixing piece 330 in the thickness direction of the fixing piece 330 (see FIG. 6). The pair of eyelets 332 are formed into annular shapes by drawing (burring). A pair of through holes penetrating the main body 30 in the thickness direction is provided at both ends in the longitudinal direction of the main body 30. The fixing piece 330 is connected to the main body 30 by crimping the tips of the pair of eyelets 332, which are inserted one by one into the pair of through holes of the main body 30 (see FIG. 6).

[0021] The mating piece 331 is formed in a U-shape (see FIG. 6). A rectangular hole 333 penetrates the tip of the mating piece 331. A groove 334 is formed in the tip of the mating piece 331. The groove 334 is formed so as to open toward the tip of the mating piece 331.

[0022] However, the fixed piece 330 of one of the pair of first coupling parts 33 is coupled to one side surface of the main body 30, and the fixed piece 330 of the other first coupling part 33 is coupled to the opposite side surface of the main body 30 (see FIG. 6). Therefore, the mating pieces 331 of the pair of first coupling parts 33 protrude in opposite directions from the main body 30 (see FIG. 6).

[0023] The second coupling portion 34 has an insertion portion 340, a protrusion 341, and a protruding piece 342 (see FIG. 6). The insertion portion 340 is formed in a semi-cylindrical shape protruding from the side surface of the main body 30 in the thickness direction of the main body 30. The protrusion 341 is formed in a semi-cylindrical shape protruding from the side surface of the main body 30 in the same direction as the insertion portion 340. The protrusion piece 342 is cut and raised so as to protrude from the side surface of the main body 30 in the same direction as the insertion portion 340, for example, at an angle of 90°. The insertion portion 340, the protrusion 341, and the protrusion piece 342 are aligned in a straight line along the longitudinal direction of the main body 30, and are arranged so as to sandwich the protrusion 341 between the insertion portion 340 and the protrusion piece 342 (see FIG. 4). Furthermore, the second connecting portion 24 of the main T-bar 2 has the same structure (insertion portion 240, protrusion 241 and protruding piece 242) as the second connecting portion 34 of the first cross T-bar 3 (see Figures 7 and 8).

[0024] Here, in the first cross T-bar 3, two second joints 34 are provided at each of the longitudinal center position of the main body 30 and the position between the longitudinal end 322 and the longitudinal center of the main body 30 (see Figs. 4 and 5B). However, the two second joints 34 at the center position are provided on both sides in the thickness direction of the main body 30. Similarly, the two second joints 34 at the positions between the end 322 and the center are provided on both sides in the thickness direction of the main body 30 (see Figs. 4 and 5B).

[0025] Furthermore, two notches 321 are provided in the bottom 32 of the first cross T-bar 3 (see Fig. 4 and Fig. 5A-5C). Each notch 321 is formed by cutting out both sides of the opening 320 in the bottom surface (lower surface) of the bottom 32 into a trapezoidal shape inclined at an angle of 45°. However, one notch 321 is provided in the center position in the longitudinal direction of the bottom 32, and the remaining notch 321 is provided in a position between one end and the center position in the longitudinal direction of the bottom 32. In other words, the two notches 321 are each provided in a position corresponding to the second joint 34 in the longitudinal direction of the bottom 32.

[0026] (Installation procedure for the system ceiling according to the embodiment) Next, the construction procedure for the system ceiling 1 will be briefly described.

[0027] First, the worker performing the construction work connects the main part 21 of the main T-bar 2 to the hanging bolt 11 via the T-hanger 10, thereby constructing multiple main T-bars 2 so that they are lined up parallel to each other at a certain interval D1 (see Figures 1 and 2).

[0028] Next, the worker joins the first joint 33 of the first cross T-bar 3 to the second joint 24 of the main T-bar 2. Specifically, the worker inserts the mating piece 331 of the first joint 33 of the first cross T-bar 3 into the insertion portion 240 of the second joint 24 of the main T-bar 2 (see Figures 9 and 10). At this time, the worker engages the protrusion 241 of the second joint 24 with the hole 333 of the mating piece 331, and fits the protrusion 242 of the second joint 24 into the groove 334 of the mating piece 331 (see Figures 7 and 8). Thus, the mating piece 331 is prevented from coming off from the insertion portion 240 by the protrusion 241 of the second joint 24 engaging with the hole 333 of the mating piece 331. Furthermore, the projection 242 of the second coupling portion 24 is fitted into the groove 334 of the mating piece 331, whereby the first coupling portion 33 and the second coupling portion 24 are positioned.

[0029] Here, the bottom 22 of the main T-bar 2 is provided with a notch 221 of the same shape as the notch 321 provided in the bottom 32 of the first cross T-bar 3 (see FIG. 10). Therefore, when the second joint 24 of the main T-bar 2 and the first joint 33 of the first cross T-bar 3 are joined, the end 322 of the first cross T-bar 3 fits into the notch 221 in the bottom 22 of the main T-bar 2 (see FIG. 8). As a result, the opening 320 in the bottom 32 of the first cross T-bar 3 and the opening 220 in the bottom 22 of the main T-bar 2 are connected. Therefore, the first cross T-bar 3 can improve the appearance of the system ceiling 1 by connecting the openings 220, 320 of both the main T-bar 2 and the first cross T-bar 3, compared to when the openings 220, 320 are divided at the joint between the main T-bar 2 and the first cross T-bar 3.

[0030] Next, the worker attaches two second cross T-bars 4 to one first cross T-bar 3. That is, the worker places two second cross T-bars 4 between two main T-bars 2 by connecting one first connecting portion 43 of the second cross T-bar 4 to each of the two second connecting portions 34 of the first cross T-bar 3 (see FIG. 1).

[0031] Here, when the second joint 34 of the first cross T-bar 3 and the first joint 43 of the second cross T-bar 4 are joined, the end 422 of the second cross T-bar 4 engages with the notch 321 of the bottom 32 of the first cross T-bar 3 (see FIG. 12). As a result, the opening 320 of the bottom 32 of the first cross T-bar 3 and the opening 420 of the bottom 42 of the second cross T-bar 4 are connected. Therefore, the first cross T-bar 3 can improve the appearance of the system ceiling 1 by connecting the openings 420, 320 of both, compared to when the openings 420, 320 are divided at the joint between the second cross T-bar 4 and the first cross T-bar 3.

[0032] Finally, the worker fits the ceiling panel 12 and the lighting fixtures 5 (equipment) into the multiple holes in the ceiling frame, which is made by combining three types of T-bars (main T-bar 2, first cross T-bar 3, and second cross T-bar 4) in a lattice pattern (see Figure 3). This completes the installation of the system ceiling 1.

[0033] (Features of the T-bar and system ceiling according to the embodiment) One feature of the T-bar (first cross T-bar 3) according to the embodiment is that it has a long main body 30, first connecting portions 33 provided at both ends of the main body 30 in the longitudinal direction, and a number of second connecting portions 34 provided on the side of the main body 30 and connectable to the first connecting portions 33. The first connecting portions 33 of the first cross T-bar 3 have the same configuration as the second connecting portions 34 and are connected to the second connecting portions 24 provided on the main T-bar 2. In addition, the second connecting portions 34 of the first cross T-bar 3 are connected to the first connecting portions 43 provided on the second cross T-bar 4 and have the same configuration as the first connecting portions 33.

[0034] Therefore, the first cross T-bar 3 can be directly joined to the main T-bar 2 and the second cross T-bar 4, which further simplifies the construction work compared to the conventional configuration in which joiners are used for connection. The system ceiling 1 including the first cross T-bar 3 can also further simplify the construction work.

[0035] Here, two types of conventional system ceilings are provided: a grid type and a line type. A grid type system ceiling is configured by combining multiple T bars in a lattice pattern, and installing square ceiling panels and equipment such as lighting fixtures in the square holes separated by the T bars. On the other hand, a line type system ceiling is configured by installing multiple T bars in a row in the same direction, and installing ceiling panels and equipment such as lighting fixtures in rectangular holes separated by parallel T bars. Conventionally, only one type of system ceiling, either the grid type or the line type, could be constructed, and the types of equipment that can be installed (such as lighting fixtures and air conditioning outlets) are also limited.

[0036] On the other hand, the first cross T-bar 3 has a plurality of (two in the embodiment) second joints 34, and each of the second joints 34 can be joined to the first joint (the first joint 43 of the second cross T-bar 4). In the first cross T-bar 3, one second joint 34 is provided at the center position in the longitudinal direction of the main body 30, and the other second joint 34 is provided between the center position in the longitudinal direction and the end position in the longitudinal direction. Therefore, the system ceiling 1 using the first cross T-bar 3 can combine a grid type system ceiling with a line type system ceiling. As a result, the system ceiling 1 can use both equipment for the grid type system ceiling and equipment for the line type system ceiling, so that a variety of system ceilings can be provided while further simplifying the construction work.

[0037] (summary) The T-bar (first cross T-bar 3) according to the first embodiment of the present disclosure is used in a system ceiling (1). The T-bar according to the first embodiment has a long main body (30), first connecting parts (33) provided at both ends of the main body (30) in the longitudinal direction, and a plurality of second connecting parts (34) provided on the side of the main body (30) and connectable to the first connecting parts (first connecting parts 43 of the second cross T-bar 4).

[0038] The T-bar according to the first embodiment can further simplify construction work compared to the conventional configuration in which joiners are used for joining.

[0039] A T-bar according to a second aspect of the present disclosure can be realized in combination with the first aspect. In the T-bar according to the second aspect, it is preferable that one of the second coupling parts (34) is provided at the center in the longitudinal direction of the side surface of the main body (30).

[0040] The T-bar according to the second embodiment can realize a system ceiling (1) that combines a grid type system ceiling and a line type system ceiling.

[0041] A T-bar according to a third aspect of the present disclosure may be realized by combining with the first or second aspect. In the T-bar according to the third aspect, the main body (30) preferably has a long, flat main portion (31) and a bottom portion (32) provided at the lower end of the main portion (31) along the longitudinal direction of the main portion (31). The bottom portion (32) is preferably formed in a rectangular tube shape having a linear opening portion (320) along the longitudinal direction of the bottom portion (32). The longitudinal end portion (322) of the bottom portion (32) is preferably inclined in a direction approaching the opening portion (320) toward the longitudinal tip of the bottom portion (32). The bottom portion (32) preferably has a notch portion (321) connected to the opening portion (320) at a position corresponding to at least one of the plurality of second joint portions (34). The notch (321) is preferably formed in a shape and size that allows it to mate with the end portion (322).

[0042] When the T-bar according to the third embodiment is combined with other types of T-bars (the main T-bar 2 and the second cross T-bar 4), the opening (320) of the bottom (32) can be connected to the opening (opening 220, opening 420) of the bottom (bottom 22, bottom 42) of the other types of T-bars. As a result, the T-bar according to the third embodiment can improve the external appearance of the system ceiling (1) by connecting the opening (320) to the opening of the other types of T-bars.

[0043] A T-bar according to a fourth aspect of the present disclosure can be realized in combination with the third aspect. In the T-bar according to the fourth aspect, the notch (321) is preferably formed so that the width along the longitudinal direction of the bottom (32) increases with increasing distance from the opening (320).

[0044] The T-bar of the fourth embodiment can improve the ease of fitting the end of another type of T-bar (end 422 of the second cross T-bar 4) into the cutout portion (321), and the ease of fitting the end (322) into the cutout portion of another type of T-bar (cutout portion 221 of the main T-bar 2).

[0045] A system ceiling (1) according to a fifth embodiment of the present disclosure has a plurality of main T-bars (2) installed in parallel at regular intervals, and a plurality of first cross T-bars (3) connected to the plurality of main T-bars (2) so as to intersect with the plurality of main T-bars (2). The system ceiling (1) according to the fifth embodiment has a plurality of second cross T-bars (4) connected to the plurality of first cross T-bars (3) so as to intersect with the plurality of first cross T-bars (3) and to be parallel to the plurality of main T-bars (2). Each of the plurality of first cross T-bars (3) is a T-bar according to any one of the first to fourth embodiments.

[0046] The system ceiling (1) according to the fifth aspect can realize a system ceiling (1) that combines a grid type system ceiling and a line type system ceiling while further simplifying the construction work.

[0047] The system ceiling (1) according to the sixth aspect of the present disclosure can be realized by combining with the fifth aspect. In the system ceiling (1) according to the sixth aspect, each of the first cross T-bars (3) is preferably a T-bar according to the third or fourth aspect. It is preferable that the opening (220) of the bottom (22) of the main T-bars (2) is connected to the opening (320) of the bottom (32) of the first cross T-bar (3).

[0048] The system ceiling (1) according to the sixth aspect can improve the appearance.

[0049] A system ceiling (1) according to a seventh aspect of the present disclosure can be realized by combining with the sixth aspect. In the system ceiling (1) according to the seventh aspect, it is preferable that the first joint portion (33) of the multiple first cross T-bars (3) is joined to the second joint portion (34) of the main T-bar (2). In the system ceiling (1) according to the seventh aspect, it is preferable that the second joint portion (34) of the multiple first cross T-bars (3) is joined to the first joint portion (43) of the second cross T-bar (4).

[0050] The system ceiling (1) according to the seventh embodiment can combine a grid type system ceiling and a line type system ceiling. [Explanation of symbols]

[0051] 1 System ceiling 2 Main T-bar 3. First Cross T-Bar (T-Bar) 4. Second Cross T-Bar 22 Bottom 30 Main unit 31 Main Section 32 Bottom 33 1st joint 34 Second joint 43 1st joint 220 Opening 320 Opening 321 Notch 322 End

Claims

1. A system ceiling having multiple types of T-bars, The plurality of types of T bars are Multiple main T-bars are installed parallel to each other at regular intervals, a plurality of first cross T-bars coupled to the plurality of main T-bars so as to cross the plurality of main T-bars; a plurality of second cross T-bars that intersect with the plurality of first cross T-bars and are connected to the plurality of first cross T-bars so as to be parallel to the plurality of main T-bars; having The plurality of types of T bars including the main T bar, the first cross T bar, and the second cross T bar are With a long body, a first coupling portion provided at each end of the main body in a longitudinal direction; a plurality of second coupling parts provided on a side surface of the main body, the second coupling parts being provided on ends of other T bars intersecting with the T bar and capable of being coupled to coupling parts having the same structure as the first coupling parts; having The main body has a main portion that is an elongated flat plate, The second coupling portion has a semi-cylindrical insertion portion protruding from a side surface of the main body and a protruding piece protruding from the side surface of the main body in the same direction as the insertion portion, the first connecting portion is provided on a side surface of a body of another T-bar that intersects with the T-bar, and has a mating piece that is inserted into the insertion portion of a connecting portion having the same structure as the second connecting portion, A groove is provided at the tip of the mating piece, and a protruding piece of a coupling part having the same structure as the second coupling part is provided on the side of the main body of another T-bar that intersects with the T-bar and is fitted into the groove. System ceiling.

2. One of the plurality of second coupling portions is provided at the center of the side surface of the main body in the longitudinal direction. The system ceiling according to claim 1.

3. The main body further includes a bottom portion provided at a lower end of the main portion along a longitudinal direction of the main portion, The bottom portion is formed in a rectangular tube shape having a linear opening along a longitudinal direction of the bottom portion, The end portion of the bottom portion in the longitudinal direction is inclined toward the opening toward the tip of the bottom portion in the longitudinal direction, the bottom portion has a notch connected to the opening at a position corresponding to at least one of the plurality of second coupling portions; The notch is formed in a shape and size such that it can be engaged with an end of a body having the same structure as the body of another T-bar that intersects with the T-bar.

3. The system ceiling according to claim 1 or 2.

4. The cutout portion is formed so as to have a width along the longitudinal direction of the bottom portion that increases with increasing distance from the opening portion. The system ceiling according to claim 3.

5. The plurality of main T-bars have a body having the same structure as the main body, and the openings at the bottom of the plurality of main T-bars are connected to the openings at the bottom of the first cross T-bar.

5. The system ceiling according to claim 3 or 4.

6. The first connecting portions of the plurality of first cross T-bars are provided on the side of the main body of the main T-bar and are connected to a connecting portion having the same structure as the second connecting portion; The second connecting portions of the plurality of first cross T-bars are provided at the ends of the second cross T-bars and are connected to connecting portions having the same structure as the first connecting portions. The system ceiling according to claim 5.

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