JPH05163795A - Ceiling structure - Google Patents

Abstract

PURPOSE:To promote close dimensional tolerances in a frame work of ceiling bars, to promote face rigidity and to reduce a number of execution processes. CONSTITUTION:Cross-shaped coupling metal fixtures 5 are suspended by suspension metal fixtures 4 mounted to hanger bolts 3 suspended from a ceiling slab 1. An intermediate section of the adjoing first ceiling bar 61 is held by the coupling metal fixtures 5 and, at the same time, a second ceiling bar 62 is held at a right angle. In the same way, a third ceiling bar 63 is held at a right angle by the coupling metal fixtures 5 holding the intermediate section of the second ceiling bar 62, a fourth ceiling bar 64 is held at a right angle by the coupling metal fixtures 5 holding the intermediate section of the third ceiling bar 63, and the first ceiling bar 61 is held at a right angle by the coupling metal fixtures 5 holding the intermediate section of the fourth ceiling bar 64 to form a ceiling panel building square space 7 in the same plane. According to the constitution, the ceiling bars 61-64 can continuously arrange a plurality of square spaces 7 in the same plane on the basis of the square space 7 as one of the sides of the adjoing square space 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling structure, and more specifically, a ceiling panel is installed between a plurality of ceiling bars suspended by suspending means suspended from a ceiling slab. The present invention relates to a so-called system type ceiling structure.

[0002]

2. Description of the Related Art Generally, in this type of ceiling structure,
In framing the ceiling bars, dimensional accuracy such as distance (positioning) and angle at intersections (intersections) between the ceiling bars, rigidity of the ceiling bars, and simplification of construction are important factors.

Therefore, conventionally, a ceiling bar is assembled in a lattice shape using a cross-shaped connecting fitting (see Japanese Utility Model Publication No. 2-14569), or a cross-shaped or T-shaped connecting fitting is used. A ceiling bar arranged in a grid or in a staggered manner has been developed (see Japanese Utility Model Publication No. 51-45863).

[0004]

However, the former, that is, the one disclosed in Japanese Utility Model Publication No. 2-14569, has a structure in which the ceiling bars are respectively attached to the four connecting pieces of the connecting fittings, so that the distance between the intersections is determined. Is troublesome,
Moreover, since the adjacent grid-shaped spaces are discontinuous, there is a problem in securing rigidity. Therefore, it becomes difficult to accurately position each intersection of the ceiling bar, and the surface rigidity of the ceiling cannot be made sufficient, and there is a problem that the construction requires skill and the like. On the other hand, the latter, that is, the one disclosed in Japanese Utility Model Publication No. 51-45863, can secure the rigidity by the straightness of the ceiling bar on the two opposite sides of the lattice-shaped space, but the straightness of the other two sides. Without
There is a problem in securing rigidity. Further, particularly in the case of the zigzag arrangement, two types of ceiling bars are required, so that there are problems that the number of constituent members increases and the management of the members is troublesome. Further, in this structure, since the connecting metal fittings are used only for connecting the ceiling bars to each other, a suspending means for suspending the ceiling bars to the suspension bolts hanging from the ceiling slab is required separately. Was becoming. Furthermore, in this type of ceiling structure, since the ceiling panel is installed on the lower flange portion of the ceiling bar, it is inevitable that the joint is exposed to the inside of the room, so a means for enhancing the aesthetics of the joint is required. Met.

The present invention has been made in view of the above circumstances, and it is intended to position the intersections of ceiling bars, ensure accurate dimensional accuracy such as angles, ensure surface rigidity, simplify construction, and improve aesthetics. It is intended to provide a structure.

[0006]

In order to achieve the above object, in the ceiling structure of the present invention, a ceiling panel is installed between a plurality of ceiling bars suspended by suspending means suspended from a ceiling slab. Assuming that the ceiling structure is composed of four ceiling bars, the intersections of the four ceiling bars are orthogonally connected to the intermediate side portions of the adjacent ceiling bars, and the end portions of the other adjacent ceiling bars are connected to the intermediate side portions thereof. It is characterized in that a plurality of rectangular spaces for arranging a ceiling panel on the same plane are formed by connecting them to each other in an orthogonal manner and a plurality of the rectangular spaces are arranged in the same plane.

In the present invention, the connecting means for connecting the ceiling bars may be used only for connecting the ceiling bars, but preferably the connecting means is suspended by the suspending means. It is better to connect them.

Further, it is preferable that a positioning guide portion for connecting to the connecting means is formed on an intermediate side portion of the ceiling bar.

The ceiling bar may be entirely formed of, for example, an aluminum member or a steel member, but in order to improve the aesthetics of the joints while maintaining the rigidity, the ceiling bar may be used. Comprises a base having a hollow rectangular cross section extending a hanging piece engaging with the connecting means at the lower part of the side wall surface, and a ceiling panel erection section having a reverse T-shaped cross section hanging from the lower surface of the base. It is preferable that at least the upper surface and both side wall surfaces of the hollow rectangular base portion are formed of steel members, and at least the ceiling panel installation flange of the ceiling panel installation portion is formed of an aluminum member. In this case, it is preferable to provide an opening groove along the upper surface of the hollow rectangular base portion so as to engage with the connecting means, because the connection with the connecting means becomes easier.

[0010]

According to the ceiling structure of the present invention configured as described above, the intersecting portions of the four ceiling bars are connected to the intermediate side portions of the respective adjacent ceiling bars in an orthogonal manner, and are also adjacent to each other. The ceiling bars of the other ceiling bar are connected to the middle side of the ceiling bars in an orthogonal manner to form a rectangular space for laying ceiling panels on the same plane, and each ceiling bar is continuously formed as one side of an adjacent rectangular space. By arranging a plurality of rectangular spaces on the same plane based on the rectangular space, the positioning accuracy of the intersections of the ceiling bars and the dimensional accuracy of the angles, etc. are accurate, the rigidity due to the straightness of the ceiling bars can be secured, and the construction is simple. Can be realized.

By connecting the ceiling bar with the connecting means suspended by the suspending means, the number of constituent members can be reduced and the construction can be simplified.

Further, by forming a positioning guide portion for connecting to the connecting means on the intermediate side portion of the ceiling bar, positioning of the intermediate portion of the ceiling bar is facilitated, and the ceiling bar and the connecting means are connected. Can be connected with high precision.

Further, the ceiling bar has a hollow rectangular base section having a hanging rectangular piece which engages with the connecting means at the lower portion of the side wall surface, and an inverted T-shaped ceiling section having a hanging section on the lower surface of the base section. By constructing with a panel erection part, at least the upper surface and both side wall surfaces of the hollow rectangular base part are formed of steel members, and at least the ceiling panel erection flange of the ceiling panel erection part is formed of an aluminum member It is possible to improve the aesthetics of the joint while maintaining the above. In addition, by installing an opening groove along the upper surface of the hollow rectangular base portion that engages with the connecting means, the hanging piece and the opening groove are used to ensure the attachment of the connecting means and to firmly connect the ceiling bars. In addition, the in-plane rigidity of the ceiling surface can be further increased.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First Embodiment FIG. 1 is an overall schematic plan view of the first embodiment of the ceiling structure of the present invention, FIG. 2 is an enlarged perspective view of the main part thereof, and FIG. 3 is III of FIG.
FIG. 4 is a sectional view taken along line III-III, and FIG. 4 is a perspective view of the basic frame structure of the ceiling bar according to the present invention.

In the ceiling structure of the present invention, a hanging metal fitting 4 which is a height-adjustable hanging means attached to a hanging bolt 3 hanging with an anchor 2 on a ceiling slab 1, and a lower portion of the hanging metal fitting 4 are provided. A cross-shaped connecting fitting 5 which is a connecting means to be attached, a plurality of ceiling bars 6 connected in an orthogonal manner by the connecting fitting 5, and a rectangular space 7 for ceiling panel installation formed by the plurality of ceiling bars 6. It is composed of a plurality of ceiling panels 8 installed inside. In addition, between the upper surface of the ceiling bar 6 at an arbitrary position and the ceiling slab 1, tension means 9 for preventing the horizontal movement of the ceiling bar 6 is stretched in an inclined shape.

In this case, the rectangular space 7 is, as shown in FIGS. 2 and 4, at the intersection of the four ceiling bars 6 forming the rectangular space 7, the intermediate side of one of the adjacent ceiling bars 6. The other ceiling bars 6 are connected to each other in an orthogonal manner, and the other adjacent ceiling bars 6 are connected to the middle side in an orthogonal manner to form the same planar rectangular shape. Are continuously assembled to form a ceiling skeleton by assembling a plurality of square spaces 7 that are adjacent to each other in the same plane. Also, the ceiling panel 8
Is a rectangular frame 32 for mounting equipment equipment 31, such as lighting and air-conditioning, which is laid across two parallel connecting bars 30, 30 which are laterally bridged between opposing ceiling bars 6, 6 in the rectangular space 7. It is formed in a trapezoidal shape that is installed between each side of and the ceiling bar 6. The ceiling panel 8 is, as shown in FIGS. 3 and 7 to 9, a trapezoidal metal surface plate 8a having a large number of small holes, and glass wool disposed on the back surface of the surface plate 8a. And a sound absorbing / sound absorbing material 8b, etc., and a hook portion 8d bent to the upper end of a standing edge 8c standing on the side of the surface plate 8a is locked to the locking projection 6e of the ceiling bar 6. Is installed on the ceiling bar 6.

As shown in FIG. 5, the hanging metal fitting 4 is connected to an upper horizontal piece 4b having a horizontal elongated hole 4a into which a screw portion 3a on the lower end side of the hanging bolt 3 is horizontally movably fitted. Lower horizontal piece 4c having a mounting hole 4g mounted and fixed on the upper surface of the metal fitting 5, and these upper horizontal piece 4b and lower horizontal piece 4c.
It has a structure in which a reinforcing rib 4f is bent on a side edge of a U-shaped body 4e composed of a vertical piece 4d for connecting and. The suspending metal fitting 4 configured in this manner has the upper horizontal piece 4 with the threaded portion 3a of the hanging bolt 3 inserted into the horizontal elongated hole 4a.
Upper nut 3b screwed to the upper and lower sides of b
And the lower nut 3c is fastened to the suspension bolt 3 so that its height can be adjusted.

As shown in FIGS. 5 to 10, the connecting fitting 5 has a boss portion 12 having a through hole 11 through which the fixing bolt 10 is inserted, and a radial direction divided into four equal parts from the boss portion 12. The ceiling bar holding portion 13 has an inverted U-shaped cross section and extends in a cross shape. In this case, the ceiling bar holding portion 13 holds the ceiling bar 6 by hanging downward from both side edges on the front end side, and holds the ceiling bar holding claw 14 at the lower end.
Is provided with a pair of holding pieces 15, 15 for angle regulation. The upper end side of the holding piece 15 is the ceiling bar holding portion 1.
Elasticity is ensured by suspending the side piece 16 of No. 3 with a cut 17 and hanging downward. In addition, the upper surface 6 of the ceiling bar 6 is on the horizontal surface side where the holding pieces 15 and 15 are located.
A burring portion 19 having a screw hole for attachment of a tightening screw 18 that projects toward a is provided. Further, on the base end side of the horizontal plane, a locking claw 20 for angle regulation that engages with an opening edge of a narrow opening groove 6b which is provided at the upper end of the ceiling bar 6 and which opens upward is bent downward. Has been done. The locking claw 20 is fitted in the narrow opening groove 6b of the ceiling bar 6 to maintain the straightness of the ceiling bar 6, and together with the holding piece 15, the ceiling bars 6 and 6 orthogonal to each other. Angle regulation can be performed.

On the other hand, the ceiling bar 6 is, as shown in detail in FIGS. 5 and 11, a base 6c having a hollow rectangular cross section and a ceiling panel erected with an inverted T-shaped cross section that hangs on the lower surface of the base 6c. It is composed of a part 6h. In this case, the base 6c
Is provided along the upper surface 6a with a narrow opening groove 6b which is engaged with the locking claw 20 of the connecting fitting 5 and which opens upward, and a hanging portion which engages with the ceiling bar holding claw 14 of the connecting fitting 5 at the lower part of the side wall surface. Piece 6
i extends, and the ceiling panel erection portion 6h includes the base portion 6h.
A vertical panel 6d that hangs from the center of the lower surface of c is provided with a ceiling panel erection flange 6f at the lower end of which a locking projection 6e is erected. By forming the ceiling bar 6 in this manner, surface rigidity and straightness can be enhanced by the hollow rectangular base portion 6c, and the hanging piece 6d and the narrow opening groove 6b can be used to easily and securely attach the connecting fitting 5. Can be A registration mark 6g, which is a positioning guide for connecting to the connecting fitting 5, is provided on the intermediate side surface of the base 6c. The alignment mark 6g is to be fitted to the edge of the end of the connecting fitting 5, and is formed of a triangular mark and a straight line here. However, the alignment mark 6g is not limited to this, and may be formed by, for example, drawing or cutting and raising. Good.

Next, the connecting fitting 5 constructed as described above.
A case where the ceiling bar 6 is connected to form the rectangular space 7 will be described with reference to FIGS. 2, 4, 5, and 7. Here, the four ceiling bars forming the rectangular space 7 are referred to as first to fourth ceiling bars, and reference numerals 61, 62,
63 and 64 will be described.

First, a hanging bolt 3 is hung on the ceiling slab 1 with an anchor 2 and the hanging bracket 4 is attached to the hanging bolt 3.
After attaching the upper and lower nuts 3b and 3c,
A fixing bolt 10 and a fixing nut 10 are provided on the lower surface of the hanging metal fitting 4.
The connecting fitting 5 is fixed with a (see FIG. 7).

Next, as shown in FIG. 4, the first ceiling bar 61 is inserted and held between the holding pieces 15 and 15 of the ceiling bar holding portions 13 and 13 of the connecting fitting 5 which face each other. At this time, the alignment mark 6g formed on the ceiling bar 61 is aligned with the end edge of the connecting fitting 5, and the first ceiling bar 61 is positioned.
The locking claw 20 is engaged in the narrow opening groove 6b at the intermediate portion of the second ceiling bar 6 between the holding pieces 15 and 15 of the ceiling bar holding portion 13 in the direction orthogonal to the first ceiling bar 61.
The second end portion is inserted and held, and the locking claw 20 is engaged in the narrow opening groove 6b, so that the first and second ceiling bars 61,
62 is held in a T-shape by the ceiling bar holding claws 14 in a temporarily fixed state. In this state, the first ceiling bar 61 and the second ceiling bar 61
The angle is regulated orthogonally to the ceiling bar 62.

Similarly, the third ceiling bar is held between the holding pieces 15 and 15 of the holding portion 13 of the connecting fitting 5 holding the middle portion of the second ceiling bar 62 in a direction orthogonal to the second ceiling bar 62. While inserting the end portion of 63, the locking claw 20 is engaged in the narrow opening groove 6b of the third ceiling bar 63, and the third fitting of the connecting fitting 5 for holding the intermediate portion of the third ceiling bar 63 is provided. Holding pieces 15, 15 of the holding portion 13 in a direction orthogonal to the ceiling bar 63
The holding piece 15 of the holding portion 13 in the direction orthogonal to the fourth ceiling bar 64 of the connecting fitting 5 that holds the intermediate portion of the fourth ceiling bar 64 by inserting the end portion of the fourth ceiling bar 64 between them, The end portion of the first ceiling bar 61 is inserted between 15 to form the rectangular space 7. At this time, the ceiling bars 61 to 64 are moved along the engagement between the locking claw 20 and the narrow opening groove 6b to move the ceiling bars 61 to 64.
After aligning a distance of up to 64, the tightening screw 18 is passed through the mounting screw holes of the burring portion 19 to the ceiling bars 61 to 6
By pressing on the upper surface 6a of 4, the bottom surface of the narrow opening groove 6b, the lower ends of the base portions 6c of the ceiling bars 61 to 64, that is, the hanging pieces 6i, are pushed down and are pressed and locked to the holding claws 14. Therefore, it is possible to perform the tightening and fixing without changing the levels of the ceiling bars 61 to 64 in the temporarily fixed state and the fixed state.

Based on the square space 7 formed as described above, similarly, the ceiling bars 6 are sequentially connected by the connecting fittings 5 to form a plurality of square spaces 7 in the same plane, and then each square space 7 is formed. Two parallel connecting bars 30 and 30 are horizontally installed between the ceiling bars 6 and 6 facing each other, and a rectangular frame 32 of equipment equipment 31 such as lighting equipment and air conditioning equipment is straddled in the middle of the connecting bars 30 and 30. The ceiling panel 8 is installed between the rectangular frame 32 and the ceiling bar 6 to complete the assembly work.

Therefore, the two sides of the rectangular space 7 can be formed by one kind of ceiling bar 6, so that the number of constituent members can be reduced and the in-plane rigidity can be improved. Moreover, since it is not necessary to connect the end portions of the ceiling bar 6 together, the number of construction steps can be reduced.

Although the equipment 31 is installed in the rectangular space 7 and the trapezoidal ceiling panel 8 is installed between the ceiling bar 6 and the equipment 31 in the above-mentioned embodiment, the case is not always required. It is not necessary to have a structure, and a rectangular ceiling panel may be installed between the opposing ceiling bars 6 and 6 without installing the equipment 31 in the rectangular space 7.

Second Embodiment FIG. 12 is an exploded perspective view of the connecting means of the suspending means, the connecting means and the ceiling bar in the second embodiment of the present invention. FIG. 13 shows the connecting means and the ceiling bar in the second embodiment. FIG. 14 is a cross-sectional view of a connected state of FIG. 14, FIG. 14 is a perspective view of a ceiling bar in the second embodiment,
FIG. 15 shows an exploded perspective view of the ceiling bar.

The ceiling structure in the second embodiment is a case where the appearance of the joint portion of the ceiling surface can be improved. That is, the ceiling bar 6 hangs on the lower portion of the side wall surface to the base portion 6c having a hollow rectangular cross section extending the hanging piece 6d that engages with the ceiling bar holding claw 15 of the connecting fitting 5, and the lower surface of the base portion 6c. It is composed of a ceiling panel erection part 6h having an inverted T-shaped cross section,
This is a case where the upper surface 6a and both side wall surfaces of the hollow rectangular base portion 6c are formed of a steel member 6m, and the ceiling panel installation portion 6h is formed of an aluminum (specifically, aluminum alloy) member 6n. In this case, steel member 6m
A concave opening groove 6j is provided along the upper surface 6a of the above, and the engaging bent portion 6p is provided inside the lower end of the hanging piece 6d extending to the lower portion of the side wall surface.
The aluminum member 6n is integrally formed with a hollow rectangular portion lower surface piece 6l having an engaging hanging claw 6k that engages with the engaging bent portion 6p at the upper end of the vertical piece 6d. In this case, at least the upper surface 6a and both side wall surfaces of the hollow rectangular base portion 6c are formed of steel members 6m, and at least the ceiling panel installation flange 6f of the ceiling panel installation portion 6h.
May be formed of an aluminum member 6n.

By constructing the ceiling bar 6 with the steel member 6m and the aluminum member 6n as described above, it is possible to improve the aesthetics of the joint portion while maintaining the rigidity. Further, the hanging groove 6j and the opening groove 6 are provided by providing the opening groove 6j along the upper surface 6a of the hollow rectangular base 6c.
It is possible to secure the attachment of the connecting fitting 5 by using j, to strengthen the connection between the ceiling bars, and to further enhance the in-plane rigidity of the ceiling surface.

In the above description, the case where the concave opening groove 6j is formed on the upper surface of the hollow rectangular base portion 6c has been described. However, the opening groove 6j does not necessarily have to be concave and similar to the first embodiment. The narrow opening groove 6b may be formed. Since the other parts of the second embodiment are the same as those of the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

[0032]

As described above, since the ceiling structure of the present invention is constructed as described above, the following effects can be obtained.

1) According to the ceiling structure of claim 1, 4
The intersecting portions of the ceiling bars of the book are connected to the intermediate side portions of the adjacent ceiling bars in an orthogonal manner, and the ends of the other adjacent ceiling bars are connected to the intermediate side portions thereof in an orthogonal manner to form the same plane. -Shaped ceiling panel erection square space is formed, and each ceiling bar is formed by arranging a plurality of square spaces that form one side of adjacent square spaces in the same plane, so that the square spaces are firmly connected to each other. The angle between sides and straightness can be reliably ensured, and the construction can be simplified.

2) According to the ceiling structure of claim 2, since the ceiling bar is connected by the connecting means suspended by the suspending means, the number of constituent members can be reduced and the construction can be further simplified. Can be achieved.

3) According to the ceiling structure of the third aspect, since the positioning guide portion for connecting to the connecting means is formed on the middle side portion of the ceiling bar, positioning is facilitated, Further, the dimensional accuracy can be improved.

4) According to the ceiling structure of claim 4, at least the upper surface and both side wall surfaces of the hollow rectangular base portion of the ceiling bar are formed of steel members, and at least the ceiling panel installation flange of the ceiling panel installation portion is formed. Since it is formed of an aluminum member, it is possible to improve the aesthetic appearance of the joint portion while maintaining the surface rigidity.

5) According to the ceiling structure of claim 5, since the opening groove for engaging with the connecting means is provided along the upper surface of the hollow rectangular base portion of the ceiling bar, the hanging piece and the opening are provided in addition to the above 4). The groove can be used to ensure the attachment of the connecting means to strengthen the connection between the ceiling bars and to further increase the in-plane rigidity of the ceiling surface.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an entire first embodiment of a ceiling structure of the present invention.

FIG. 2 is an enlarged perspective view showing a main part of a ceiling structure.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a perspective view showing a rectangular space for constructing a ceiling panel according to the present invention.

FIG. 5 is an exploded perspective view showing a connection state of the suspension means, the connection means, and the ceiling bar in the present invention.

FIG. 6 is a plan view showing a connecting state of the connecting means and the ceiling bar in the present invention.

7 is a sectional view taken along line VII-VII of FIG.

8 is a sectional view taken along the line VIII-VIII of FIG.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a bottom view of FIG.

FIG. 11 is a sectional perspective view showing a ceiling bar according to the present invention.

FIG. 12 is an exploded perspective view showing a connecting state of the hanging means, the connecting means and the ceiling bar of the second embodiment of the ceiling structure of the present invention.

FIG. 13 is a cross-sectional view showing a connected state of the connecting means and the ceiling bar of the second embodiment.

FIG. 14 is a perspective view showing a ceiling bar in the second embodiment.

FIG. 15 is an exploded perspective view of a ceiling bar in the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceiling slab 3 Suspension bolt 4 Suspension metal fitting (suspension means) 5 Coupling metal fitting (coupling means) 6 Ceiling bar 6a Upper surface 6b Narrow opening groove 6c Hollow rectangular base 6d Vertical piece 6e Engagement ridge 6f Ceiling panel installation flange 6g Alignment mark (guide for positioning) 6h Ceiling panel installation part 6i Hanging piece 6j Concave opening groove 6m Steel member 6n Aluminum member 7 Ceiling bar installation square space 8 Ceiling panel

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI Technical indication location 9127-2E E04B 5/58 B (72) Inventor Arihiro Nagatani 1-1-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside the Naka Technical Research Institute

Claims (5)

[Claims] 1. In a ceiling structure in which a ceiling panel is installed between a plurality of ceiling bars suspended by suspension means suspended from a ceiling slab, four intersections of the ceiling bars are adjacent to each other. It connects orthogonally to the middle side part of one ceiling bar, and connects the ends of the other adjacent ceiling bars to the middle side part thereof orthogonally to form a rectangular space for ceiling panel erection on the same plane. A ceiling structure comprising a plurality of the rectangular spaces arranged in the same plane. 2. The ceiling structure according to claim 1, wherein the ceiling bars are connected by connecting means suspended by suspending means. 3. The ceiling structure according to claim 2, wherein a positioning guide portion for connecting to the connecting means is formed on an intermediate side portion of the ceiling bar. 4. A ceiling bar, a base having a hollow rectangular cross-section extending from a lower portion of a side wall surface of a hanging piece engaging with the connecting means.
A cross section that hangs on the lower surface of this base portion is composed of an inverted T-shaped ceiling panel erection portion, and at least the upper surface and both side wall surfaces of the hollow rectangular base portion are formed of steel members, and at least the ceiling panel erection portion is formed. The ceiling structure according to claim 2, wherein the ceiling panel installation flange is formed of an aluminum member. 5. The ceiling structure according to claim 4, wherein an upper surface of the hollow rectangular base portion of the ceiling bar is provided with an opening groove engaged with the connecting means.