JP2017172212A - Ceiling decorative structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceiling decorative structure capable of installing a support material by an anchor, and capable of easily installing a ceiling decorative material from below between the support materials by simple operation, without impairing a ceiling aesthetic appearance, in a decorative structure installed to a ceiling backing such as RC.SOLUTION: Provided is a ceiling decorative structure for installing a ceiling decorative material 1 between adjacent support materials 2 and 2, by installing the support materials 2 having at least a web 21 and a lower flange 22 provided on its lower end at a predetermined interval to a ceiling backing, and the ceiling decorative material 1 comprises a decorative surface part 11 of becoming a decorative surface on the undersurface side, fitting-in parts 12 and 12 respectively extending downward from the left-right of the decorative surface part 11 and arranged above the lower flange 22 of the support material 2 in at least an installation state and engaging parts 13 and 13 extended to the lower end of the fitting-in parts 12 and 12, and the engaging parts 13 and 13 are fitted by arranging the ceiling decorative material 1 between the lower flanges 22 and 22 of the adjacent support materials 2 and 2 butted at an interval.SELECTED DRAWING: Figure 1

Description

  The present invention is a decorative structure that is attached to a ceiling foundation formed of RC (steel reinforced concrete) or the like, and does not impair the aesthetic appearance of the ceiling. It is related with the ceiling makeup | decoration structure which can be easily attached from below by simple operation.

  The ceiling (inner wall) such as a ceiling constructed by RC (steel reinforced concrete), etc., is a suspended ceiling in which anchor bolts are driven into the roof foundation in order to obtain design properties, and ceiling material support materials, ceiling materials, etc. are attached to the anchor bolts. The ceiling is finished by a method called

  However, the above-described method of driving the anchor and attaching various types of decorative materials in a stretched manner causes a complicated configuration from the viewpoint of earthquake resistance and the like, and also requires a lot of construction work.

  Therefore, the present invention is a decorative structure that is attached to a ceiling foundation such as RC, and does not impair the appearance of the ceiling, and the support material is attached with an anchor and the ceiling decorative material can be simply placed between the support materials from below. The purpose is to propose a ceiling decorative structure that can be easily attached by operation.

  The present invention has been proposed in view of the above, and a support material including at least a web and a lower flange provided at a lower end of the web is attached to a ceiling base at a predetermined interval, and the adjacent support materials A ceiling decorative structure with a ceiling decorative material attached therebetween, wherein the ceiling decorative material extends downward from the left and right sides of the decorative surface portion on the lower surface side, and is supported at least in the mounted state. Between the lower flanges of the adjacent support materials that have a fitting portion disposed above the lower flange of the material and an engaging portion that extends to the lower end of the fitting portion and that are abutted at a distance Further, the present invention proposes a ceiling decorative structure in which the ceiling decorative material is disposed and the engaging portion is fitted.

  The present invention also proposes a ceiling decorative structure characterized in that, in the ceiling decorative structure, the support member has a plurality of openings formed in the web.

  Further, in the ceiling decorative structure according to the present invention, the support material is formed by a lateral surface portion fixed to the ceiling base, a web that is folded at the left and right sides of the lateral surface portion, and a lower end of the web that is folded outward. A ceiling decorative structure is also proposed, which is a left-right symmetrical member having a lower flange.

  The present invention also proposes a ceiling decorative structure characterized in that, in the ceiling decorative structure, the ceiling decorative material is folded or folded at the front end and the rear end of the decorative surface portion.

  The present invention also proposes a ceiling decorative structure in which, in the ceiling decorative structure, the ceiling decorative material has a fixing portion extending downward at the lower end of the engaging portion.

  The present invention also proposes a ceiling decorative structure in which a decorative cover for covering the lower flange of the support material from the lower side is provided in the ceiling decorative structure.

In the ceiling decorative structure of the present invention, a support material is attached to a ceiling base such as RC (steel reinforced concrete) with an anchor or the like, and the ceiling decorative material is disposed between the lower flanges of adjacent support materials that face each other with a gap therebetween. In this configuration, the left and right insertion portions provided on the ceiling decorative material are respectively arranged inside the lower flanges of the adjacent support materials and the left and right engagement portions are fitted.
Therefore, in this ceiling decorative structure, there are few places where an anchor or the like is used, and the ceiling decorative material can be easily and reliably fixed to the attached support material.
The ceiling decorative material includes a unique decorative surface that is concave (convex upward) from the indoor side.

  In addition, when a plurality of openings are formed in the web of the support material, the opening is used as a site through which wiring or the like is passed, and a makeup for hiding the support material itself is used as an attachment site for a cosmetic material that hides an anchor positioned between the webs. It can be used as an attachment part of a material or as an attachment part of a device for an illumination lamp.

  Further, the support member is a bilaterally symmetric shape having a horizontal surface portion fixed to the ceiling base, a web that is folded at the left and right sides of the horizontal surface portion, and a lower flange that is formed by bending the lower end of the web outward. In the case of a member, since the ceiling decorative material to be attached between the above-mentioned support materials adjacent to each other is a symmetrical member as in the case of the support material, it is very efficient both in manufacturing and in installation. It will be a thing.

  Further, when the ceiling finishing material is folded or folded at the front end and the rear end of the decorative surface portion, the bending strength of the decorative surface portion is high, enabling weight reduction and high shape stability. .

  Further, when the ceiling decorative material has a fixing portion that extends downward at the lower end of the engaging portion, the fixing of the engaging portion becomes stronger and more reliable.

  Moreover, when the decorative cover which covers the lower flange of the support material from the lower side is provided, the beauty of the entire ceiling is improved in combination with the ceiling decorative material.

(A) Cross-sectional view showing a ceiling decorative structure in the first embodiment of the present invention, (b) a side cross-sectional view thereof, (c) an enlarged cross-sectional view showing a part of the ceiling decorative material used, (d) It is an expanded sectional view which shows the used supporting material. (A) Sectional drawing which shows the example of use of the opening part in the ceiling decorative structure of 1st Example, (b) The sectional side view, (c) The expanded sectional view which shows the structure which fixes the apparatus of the illuminating lamp used. d) It is an expanded sectional view which shows the used cosmetics. (A) It is sectional drawing which shows the state which attached the decorative cover in the ceiling decorative structure of 1st Example, (b) The sectional side view, (c) It is an expanded sectional view which shows the decorative cover used.

  The ceiling decorative structure of the present invention is such that a support material including at least a web and a lower flange provided at the lower end of the web is attached to a ceiling base at a predetermined interval, and a ceiling decorative material is attached between the support materials. is there.

The support member is attached to the ceiling base as described above, and includes at least a web and a lower flange provided at the lower end of the web.
This support material may have a left and right lower flange, which is an attachment part of the ceiling decorative material, or may have only one of the left and right. In addition, the support material may be formed by bending various metal plates or the like, or may be formed by extrusion molding or the like, and the manufacturing method is not particularly limited.

  In particular, as shown in the illustrated embodiment to be described later, a lateral surface portion in which the support material is fixed to the ceiling base, a web that is folded left and right of the lateral surface portion, a lower flange that is formed by bending the lower end of the web outward, If the ceiling decorative material to be attached between the above-mentioned supporting members adjacent to each other is a symmetrical member as in the case of the supporting material, the mounting construction is also performed in the production thereof. In this case, it becomes extremely efficient.

The web of the support material has the lower flange at the lower end, and may be provided on each of the left and right sides of one support material, or may be provided with a web only on one side. The former embodiment has a configuration having one lower flange extending outwardly on either the left or right side, and the latter embodiment has two lower flanges extending outwardly on both the left and right sides. It is a configuration.
It is desirable to form a plurality of openings in this web, but this opening contributes not only to reducing the weight of the member but also to the part through which the wiring is passed and the decorative material that hides the anchor located between the webs. It is used as an attachment part, an attachment part of a cosmetic material that hides the support material itself, an attachment part of a device for an illuminating lamp, and the shape thereof is not particularly limited to a circular shape or an elliptical shape.

As described above, since the support material is attached to the ceiling base, a lateral surface part fixed to the ceiling base is provided at the upper end of the web. For example, if the ceiling base is flat, the lateral surface part is also flat. What is necessary is just to form in a shape.
Further, the ceiling foundation refers to a lower surface formed of RC (steel reinforced concrete) or the like, and is generally substantially flat, but is not particularly limited, and is used for attaching the support material in advance. You may make it form a hole.

The ceiling decorative material has a decorative surface portion whose lower surface side is a decorative surface, and a fitting portion that extends downward from the left and right of the decorative surface portion and is disposed above the lower flange of the support material at least in an attached state; And an engaging portion provided at the lower end of the fitting portion.
Since the ceiling decorative material is attached between the adjacent supporting materials as described above, it can be formed as a bilaterally symmetric member as in the illustrated embodiment described later. In this case, there is a great advantage in both the production of the members and the attachment work (no error in the attachment direction).

  The ceiling finishing material may have a continuous shape in the length direction of the support material, but a plurality of fixed-length materials having a predetermined length may be arranged in parallel, and the design property is continuously maintained. As long as it is a material that can behave as described above, it may be composed of a single material such as a metal plate or a hard resin plate, or a combination of a board-like material and a porous material, for example. It may be composed of a plurality of materials. In addition, a board-like material may be combined with the metal plate or the like for the purpose of improving the strength, but as an aspect composed of a plurality of materials thereafter, a combination of a porous material and a board-like material is used. And

The aspect in which the ceiling decorative material is composed of a plurality of materials in which the porous material and the board-like material are combined bears all of the parts of the ceiling decorative material and the characteristics required by the ceiling decorative material. It can also be said that each material is not shared.
The decorative face portion can be improved in strength by relying exclusively on the board-shaped material, and the insertion portion and the engaging portion may be solely entrusted to the porous material. In other words, the board-like material is not particularly limited as long as it has the characteristics required for the decorative surface portion, and the porous material has the characteristics required for the insertion portion and the engagement portion. If it has, the material in particular will not be limited.

The decorative surface portion is a portion extending between the adjacent support materials, and in the illustrated embodiment described later, the side view is formed in a substantially flat shape (substantially horizontal shape), but the shape is not particularly limited. Absent.
Further, the decorative face portion is folded or lowered at the rear end and the front end depending on the material to be used, the plate thickness or length (depth direction in the drawing (for example, FIG. 1) described later), width (support material interval), and the like. It may be. That is, in that case, the bending strength of the decorative surface portion is increased, the weight can be reduced, and the shape stability is also increased. Note that a plurality of porous materials may be used as an aid for the decorative surface portion, the front end and the rear end in the length direction may be folded, and the board-shaped material may be held between the folded pieces.

As described above, the insertion portion extends downward from the left and right sides of the decorative surface portion, and is disposed at the upper side (inside) of the lower flange of the support material at least in the attached state. An engagement portion is provided. The engaging portion is elastically engaged with the tip of the lower flange in the attached state.
For example, the behavior when the ceiling decorative material is disposed so as to be pushed in from below is briefly described. By the operation of pushing from below, the left and right fitting portions are pushed up while being in contact with the tips of the lower flanges of the support material. Therefore, the ceiling decorative material is pushed up while receiving a stress that is reduced against elasticity. Then, the stress is released when the lower end of the insertion part that expands to the outermost side reaches the upper side of the lower flange of the support member (when the insertion part is pushed in), and the engagement provided at the lower end of the insertion part The portion is elastically engaged with the tip of the lower flange to obtain a stable arrangement state.
The shape of the fitting portion may be formed in any way, and is not particularly limited. However, the engaging portion provided at the lower end of the adjacent support member is connected to the tip of the lower flange of the support member from the outside. Since it engages, it is desirable that the lower end of the fitting portion is expanded outward.
In addition, the shape of the engaging portion may be appropriately set depending on the structure of the lower flange of the support material. However, for the lower flange not provided with the lip, the front end of the horizontal piece along the lower flange is folded back. What is necessary is just to form in the L-shape along a lower flange and a lip with respect to the lower flange provided with a lip.

As described above, in order to stably attach the ceiling decorative material to the lower flange of the support material, it is desirable to engage elastically.
The width between the left and right insertion parts (= maximum width of the ceiling decorative material) is longer than the gap between the lower flanges (= spaced space) adjacent to each other but will not be described. If there is no (otherwise the ceiling decorative material will be dropped), for example, if the expansion angle between the fitting part and the decorative surface part is formed to be wider than the angle of the mounted state, Elasticity also acts on the provided engaging portion. For example, even if the expansion angle between the fitting portion and the engaging portion is formed to be wider than the angle of the attached state, the elasticity is applied to the engaging portion. Therefore, it is desirable to adopt one or both of the modes for elastic engagement.

  In addition, you may make it provide the fixing | fixed part extended below in the lower end of the said engaging part. That is, by driving a fixing tool such as a screw from the fixing portion, the engagement portion is fixed more firmly and reliably.

Further, it is desirable to provide a decorative cover for covering the lower flange of the support material from below as in the illustrated embodiment described later. In this case, the beauty of the entire ceiling is improved in combination with the ceiling decorative material.
The decorative cover has a decorative surface that covers the lower flange of the support material from below, and is formed in an elongated shape that is continuous in the length direction of the support material. The decorative cover may be provided with a configuration that assists (strengthens) the attachment of the support material and the ceiling decorative material.

  The ceiling decorative structure of the present invention composed of these ceiling decorative material and support material is a configuration in which the ceiling decorative material is disposed between the lower flanges of the support material that are abutted at a distance. The engaging portion of the ceiling decorative material is fitted to the lower flange of the support material. In this ceiling decorative structure, for example, the ceiling decorative material can be easily and reliably fixed by a simple operation of pushing up toward the ceiling, and the ceiling decorative structure is concave (upward) when viewed from the indoor side. (Convex) with a unique decorative surface.

  The ceiling decorative structure according to the first embodiment of the present invention shown in FIG. 1 has a support material 2 provided with a web 21 and lower flanges 22, 22 provided at the lower end of the web 21 at a predetermined interval with respect to the ceiling base 3. The decorative surface portion 11 whose lower surface is a decorative surface between the adjacent support materials 2 and 2 and the lower flange of the support material 2 at least in the mounted state, extending downward from the left and right of the decorative surface portion 11. The ceiling decorative material 1 having the fitting portions 12 and 12 disposed above 22 and the engaging portions 13 and 13 extending to the lower ends of the fitting portions 12 and 12 is attached.

  As shown in the enlarged view of FIG. 1 (d), the support material 2 used for the ceiling decorative structure has a lateral surface portion 23 positioned substantially at the center and fixed to the ceiling base 3, and the left and right sides of the lateral surface portion 23 are folded. It is a left-right symmetrical member provided with the lowered webs 21 and 21 and lower flanges 22 and 22 provided at the lower ends of the webs 21 and 21.

  The horizontal surface portion 23 of the support material 2 is a fixing portion fixed to the ceiling base 3 by an anchor 2b, and the web 21 is a vertical portion in which a plurality of elliptical openings 211 are opened in the length direction. The lower flange 22 is formed in a horizontal plane by bending the lower end of the web 21 outward in a substantially horizontal shape, and a lip 221 as an upward piece is extended at the tip. Yes.

  Moreover, the ceiling decorative material 1 used for this ceiling decorative structure extends downward from the left and right sides of the decorative surface part 11 and the decorative surface part 11 as shown in FIG. 1 (c). At least in the attached state, the fitting parts 12, 12 disposed above the lower flanges 22, 22 of the support member 2, and the engaging parts 13, 13 extending to the lower ends of the fitting parts 12, 12; Are symmetrical members.

The decorative surface portion 11 of the ceiling decorative material 1 is a portion extending between the adjacent support materials 2 and 2, and is formed in a substantially flat shape (substantially horizontal shape) when viewed from the side. The end is folded (folded piece 111) to increase bending strength and shape stability.
Moreover, the said insertion part 12 is the shape which bent the left and right edge of the said decorative surface part 11 in the obtuse angle | corner, and inclined, Comprising: This insertion part 12 is the upper direction of the lower flange 22 of the said support material 2 in an attachment state. The engaging part 13 is extended in the lower end.

  As described above, the insertion portions 12 and 12 before being arranged are formed so as to expand more widely than the expansion angle in the arrangement state, but when the ceiling decorative material 1 is arranged to be pushed in from below, Since the left and right insertion parts 12 and 12 are pushed up while abutting against the lower flanges 22 and 22 of the supporting members 2 and 2, respectively, the insertion parts 12 and 12 are pushed up while receiving elastic deformation in the inner direction. It is done. Then, the stress is released when the lower ends of the insertion portions 12, 12 that are expanded outwardly reach the lower flanges of the support members 2, 2 (when the insertion portion 12 is pushed in), and the insertion portion The engaging portions 13 provided at the lower ends of the 12 and 12 are elastically engaged with the tip of the lower flange 22 to obtain a stable arrangement state.

Further, the engaging portion 13 extending to the lower end of the left fitting portion 12 of the ceiling decorative material 1 was formed in an L shape along the lower flange 22 and the upward lip 221 of the support material 2.
The engaging portions 13 and 13 are extended with vertical fixing portions 131 and 131 into which the screws 1b can be driven from the side.

  And the ceiling decorative material 1 before arrangement | positioning as mentioned above is shape | molded so that the insertion parts 12 and 12 on either side may expand more widely than the attachment state shown in figure, Therefore In the ceiling decorative material 1, a stress is exerted on the left and right insertion portions 12, 12 to elastically recover further outward, and the stress is also applied to the engagement portions 13, 13 extending at the lower ends thereof in the outward direction. It is working. Therefore, the engaging portion 13 is elastically engaged (pressure contact) with the upward lip 221 of the lower flange 22.

  Although it has already been described that the expansion angle of the insertion portions 12 and 12 with respect to the decorative surface portion 11 is larger than the angle of the arrangement state before the installation of the ceiling decorative material 1, You may make it shape | mold the expansion angle with the joint part 13 larger than the angle of an arrangement | positioning state, and you may make it use both together.

The ceiling decorative structure of the present invention constituted by such a member has a configuration in which the ceiling decorative material 1 is disposed between the lower flanges 22 and 22 of the support materials 2 and 2 which are abutted at a distance. The engaging portions 13 are engaged with the lower flange 22 (lip 221) of the support member 2 by being elastically engaged with each other.
Therefore, in this ceiling decorative structure, the ceiling decorative material 1 can be easily and reliably fixed to the support material 2 by a simple operation of pushing up toward the ceiling.

  Moreover, in the first embodiment, the ceiling decorative material 1 is formed symmetrically as described above. Therefore, the design and molding of the ceiling decorative material 1 can be easily performed, and an error in the mounting direction does not occur during the mounting operation.

In the first embodiment, since the front end and the rear end of the decorative surface portion 11 are folded down, the bending strength of the decorative surface portion 11 is high, the weight can be reduced, and the shape stability is also high. It was.
Further, the ceiling decorative material 1 is provided with fixing portions 131, 131 extending downward at the lower ends of the engaging portions 13, 13, and fixed with screws 1b. It became solid and reliable.
The plurality of openings 211 provided in the web 21 of the support material 2 not only contributes to the weight reduction of the support material 2 itself, but are also used as parts through which wiring is passed although not shown in FIG. be able to.

The ceiling decorative structure shown in FIG. 2 is the same as that of the first embodiment with respect to the ceiling decorative material 1 and the support material 2, and the web 21 has a plurality of oblong openings 211 formed therein. An example of a configuration in which the decorative material 4A for hiding the anchor 2b is attached to the opening 211 is described on the right side of FIG. 2 (a), and a lighting device 5A indicated by a two-dot chain line is attached to the left side of the same drawing. An example is described.
That is, the ceiling decorative structure shown in FIG. 2A shows an example in which the use of the plurality of openings 211 is different from that of the first embodiment.

FIG. 2D is an enlarged view of the configuration shown on the right side of FIG. 2A, but the decorative material 4A for hiding the anchor 2b for fixing the support material 2 is formed in a substantially Z-shape. The hooks 4b and 4b are attached.
The hook 4b is a piece material including a locking portion 41 whose upper end of the vertical piece is folded back and a coupling locking portion 42 whose lower end is folded back, and the decorative material 4A is a substantially horizontal flat makeup. Standing pieces rising from the bottom surface are formed on the left and right sides, and the upper end of each standing piece is a long material in which a wedge-shaped connection engaging portion 43 is formed.
Then, the engaging portions 41 of the hook metal fittings 4b are respectively hooked on the webs 21 and 21 of the support material 2 from the inner side, and the vertical piece is placed along the inner surface side of the web 21. The left and right connecting engaging portions 43, 43 of the locking member 2A are engaged with and integrally attached to the engaging locking portions 42, 42 of the hook metal fittings 2b, 2b. .

Although the structure shown on the left side of FIG. 2A is enlarged and shown in FIG. 2C, the member 5B for fixing the illumination lamp device 5A shown by a two-dot chain line is formed of a plurality of metal fittings. Has been.
The fixing member 5B is formed in a substantially U shape, and a vertical member 5d having a locking portion 51 at an upper end is integrally formed with a screw 5e on a main body 5c having a mounting portion 52 at a substantially center thereof. Although it is a fixed configuration and the illuminating lamp device 5A is shown in a male screw shape, in this case, the mounting portion 52 may be formed in a female screw shape.
Then, by facing the webs 21 and 21 of the support material 2 so as to push up the member 5B, the locking portions 51 and 51 are hooked from the inside to be positioned between the webs 21 and 21, respectively. What is necessary is just to attach the apparatus 5A of an illumination lamp to the part 52 integrally. Note that the illumination lamp device 5A may be hooked in a state of being attached to the fixing member 5B in advance.

The ceiling decorative structure shown in FIG. 3 is similar to the first embodiment with respect to the ceiling decorative material 1 and the support material 2, but shows an example of a configuration in which a decorative cover 6 for concealing the support material 2 itself is attached. The left side of FIG. 3 (a) shows a configuration in which the decorative cover 6 covers from the lower side of the configuration in which the illumination lamp device 5A shown in the left side of FIG. 2 (a) is fixed by the member 5B. Yes.
That is, the ceiling decorative structure shown in FIG. 3A also shows an example in which the use of the plurality of openings 211 is different from that of the first embodiment.

Although the decorative cover 6 is enlarged and shown in FIG. 3C, the left and right ends of the horizontal surface portion 61 whose lower surface side is a decorative surface are raised to provide vertical side surfaces 62 and 62, and the side surfaces are provided. The upper end of the part 62 is bent inward to form a locking horizontal piece 621. FIG. 3C shows the decorative cover 6 in an attached state, in which the side surfaces 62 and 62 are slightly inclined inward before the installation, and the locking horizontal pieces 621 and 621 are slightly below. It is formed so as to be inclined.
And it attaches so that the latching horizontal piece 621,621 of the said decorative cover 6 may cover from the outer side to the engagement piece 13,13 of the ceiling decorative material 1 in the said ceiling decorative structure. The arrangement procedure is not particularly limited. For example, either one of the left and right of the decorative cover 6 is attached to be hooked on the engaging portion 13 of the ceiling decorative material 1, and the decorative cover 6 is elasticated in that state. It may be attached while being stretched so as to be pulled sideways against.
In this configuration, the support cover 2 cannot be seen at all when viewed from the indoor side by the decorative cover 6, so that the beauty of the entire ceiling is improved in combination with the ceiling decorative material 1.

DESCRIPTION OF SYMBOLS 1 Ceiling decorative material 1b Screw 11 Decorative face part 111 Folding piece 12 Insertion part 13 Engagement part 131 Fixed piece 2 Support material 2b Anchor 21 Web 211 Opening part 22 Lower flange 221 Upward lip 23 Horizontal surface part 3 Ceiling base 6 Cosmetic cover

Claims (6)

A ceiling decorative structure in which a support material including at least a lower flange provided at the lower end of the web is attached to the ceiling base at a predetermined interval, and a ceiling decorative material is attached between the adjacent support materials,
The ceiling decorative material has a decorative surface portion whose lower surface side is a decorative surface, and a fitting portion that extends downward from the left and right of the decorative surface portion and is disposed above the lower flange of the support material at least in an attached state; An engaging portion extending to the lower end of the fitting portion,
A ceiling decorative structure, wherein the ceiling decorative material is disposed between the lower flanges of the adjacent supporting members that are abutted with each other at intervals, and the engaging portion is fitted.   The ceiling decorative structure according to claim 1, wherein the support member has a plurality of openings formed in the web.   The support material is a bilaterally symmetric member having a horizontal surface portion fixed to the ceiling base, a web that is folded at the left and right sides of the horizontal surface portion, and a lower flange that is formed by bending the lower end of the web outward. The ceiling decorative structure according to claim 1, wherein the ceiling decorative structure is provided.   The ceiling decorative material according to any one of claims 1 to 3, wherein the ceiling decorative material is folded or folded at the front end and the rear end of the decorative surface portion.   The ceiling decorative material according to any one of claims 1 to 4, wherein the ceiling decorative material has a fixing portion extending downward at a lower end of the engaging portion.   The ceiling decorative structure according to any one of claims 1 to 5, further comprising a decorative cover that covers the lower flange of the support material from below.

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