Suspended ceiling structure

Abstract

To provide a suspended ceiling structure that is easy to apply as a repair work for existing suspended ceilings and prevents ceiling panels from falling out due to shaking during earthquakes.SOLUTION: A suspended ceiling structure 1 includes: a joist receiver 30; a joist 40 attached so as to intersect the joist receiver 30; a mounting member 60 provided on a wall surface B of a building; a ceiling plate P placed between the mounting member 60 and the joist 40, or between the joists 40; a falling prevention member 70 arranged on the indoor side of each of the first joists 40 adjacent in the ceiling center direction when viewed from the mounting members 60 and the mounting members 60; and a ceiling reinforcement member 80 arranged on the back side of the ceiling over between the first joist 40 and the second joist 40 adjacent in the ceiling center direction when viewed from the first joist 40.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a suspended ceiling structure. [Background technology]

[0002] A suspended ceiling structure is known that is composed of hanging bolts hanging from a structural frame such as an upper floor floor slab, rafters supported by the hanging bolts, rafters attached so as to cross the rafters, and ceiling panels fixed to or placed on the rafters. In such suspended ceiling structures, various ideas have been proposed to prevent the ceiling panels from falling off the rafters during an earthquake. For example, a technology to prevent the ceiling panels from cracking and falling is disclosed in which a surface material having a cable is surface-joined to the underside of the ceiling panel and the cable is fastened to the building frame (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-206829 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, with this conventional technology, the weight of the facing material is applied in addition to the weight of the ceiling panels, which may work against the weight reduction, and even if such fall prevention technology is applied, when the ceiling panels fall off, they will fall together with the facing material, which may result in more falling objects over a larger area. Also, when applying this technology to earthquake-resistant renovation work for existing suspended ceilings, there is a problem that the burden of the renovation work is large because new facing materials must be surface-joined to the ceiling panels.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a suspended ceiling structure that is easily applicable to renovation work on existing suspended ceilings and prevents ceiling panels from falling due to shaking during an earthquake. [Means for solving the problem]

[0006] In order to achieve the above object, the following configuration is realized. (1) A first aspect of the present invention is a suspended ceiling structure comprising a soffit support, a soffit attached to the soffit support so as to cross it, a mounting member provided on a wall surface of a building, a ceiling panel placed between the mounting member and the soffit or between the soffits, anti-fall-out members arranged on the room side of the mounting member and each of a first soffit adjacent to the mounting member toward the center of the ceiling, and a ceiling reinforcement member arranged on the ceiling side between the first soffit and a second soffit adjacent to the first soffit toward the center of the ceiling. (2) In the above configuration (1), the anti-fall-off member entails expanding the width of the flange portion on which the ceiling board is placed in each of the mounting member and the first sill. (3) In the configuration of (1) or (2) above, the anti-falling member is arranged to extend along each of the mounting member and the first sill, and the ceiling board, the mounting member or the first sill, and the anti-falling member are fixed from the indoor side in that order when viewed from the under-ceiling side. (4) In any of the configurations (1) to (3) above, the ceiling reinforcement member structurally connects the first siding and the second siding. (5) In any of the configurations (1) to (4) above, the ceiling reinforcement member is arranged to extend between the first soffit and the second soffit, and the ceiling reinforcement member, the ceiling board, and the first soffit or the second soffit are fixed from the indoor side in that order when viewed from the ceiling side. Effect of the Invention

[0007] According to the present invention, it is possible to provide a suspended ceiling structure which is easily applicable to repair an existing suspended ceiling and which prevents ceiling panels from falling off due to shaking during an earthquake. [Brief description of the drawings]

[0008] [Figure 1] This is a diagram showing how ceiling panels can fall off due to shaking during an earthquake, and illustrates the case where this occurs due to horizontal movement of the joist support. [Diagram 2] This is also a diagram showing how ceiling panels can fall off due to shaking during an earthquake, and shows the case where this occurs when the ceiling joists are bent. [Diagram 3] FIG. 2 is a diagram for explaining FIG. 1 from the extending direction of the rafters, in which (a) shows the state before vibration and (b) shows the state during vibration. [Figure 4] FIG. 2 is a diagram illustrating an embodiment of the present invention viewed from the extension direction of the rafters. [Diagram 5] 1 is a diagram illustrating the overall layout of a suspended ceiling structure in a plan view according to an embodiment of the present invention; [Figure 6] FIG. 1 is a diagram showing an aspect of repair work for an existing suspended ceiling, showing cutting of ceiling panels. [Figure 7] FIG. 11 is a diagram showing the manner of repair work on an existing suspended ceiling, where (a) shows the manner in which a ceiling reinforcement member is installed in the ceiling space, and (b) shows the manner in which it is fixed with screws from the inside of the room. [Figure 8] FIG. 13 is a diagram showing the repair work for an existing suspended ceiling, with anti-fall-off members installed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (Embodiment) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description will be given of an embodiment of the present invention with reference to the drawings. In the description of the embodiment, the same elements are denoted by the same reference numerals.

[0010] First, the manner in which the ceiling board P falls off the joist 40 during an earthquake will be described with reference to Figs. 1 to 3. Fig. 1 shows the manner in which the ceiling board P falls off due to shaking during an earthquake, where the joist support 30 moves horizontally, Fig. 2 shows the manner in which the ceiling board P falls off due to shaking during an earthquake, where the joist 40 bends, and Fig. 3 is a schematic diagram illustrating the case of Fig. 1 as viewed from the extension direction of the joist 40 (depth direction relative to the paper). In this embodiment, the joist 40 is a member called a T-bar with a T-shaped cross section, and is arranged in an inverted T shape, with the ceiling board P placed on the flange portion.

[0011] As shown in FIG. 1, when the distance between adjacent rafters 40 increases due to the shaking of an earthquake, the ceiling board P falls off from the flange of the rafter 40. Also, as shown in FIG. 2, when the rafter 40 is bent (flexed) in the extension direction due to the shaking of an earthquake, the ceiling board P also rises up from the flange of the rafter 40 and falls off. FIG. 3 shows a schematic representation of a certain case in FIG. 1 in the horizontal direction (extension direction of the rafter 40 (depth direction relative to the paper)). The certain case shows a state in which the distance between the mounting member 60 provided on the wall B of a building in which a suspended ceiling structure 1 is provided and the first rafter 40 adjacent to the center of the ceiling as viewed from the mounting member 60 increases, causing the ceiling board P to fall off the mounting member 60 (see the state before vibration in FIG. 3(a) and the state during vibration in FIG. 3(b)). The mounting member 60 is a member called an L-angle with an L-shaped cross section.

[0012] In this way, when the ceiling board P is simply placed on the flange portion of the joist 40, it is difficult to prevent the ceiling board P from falling off due to earthquake shaking, especially when the ceiling board P is made of a material with low flexibility such as gypsum board or other synthetic material. Therefore, in this embodiment, as described below, the ceiling board P is configured to follow the shaking of the joist 40 and not fall off from the joist 40.

[0013] The suspended ceiling structure 1 according to this embodiment will be described with reference to Fig. 4. Fig. 4 corresponds to Fig. 3 and is a diagram illustrating the structure as seen from the extension direction of the joists 40 (the depth direction relative to the paper surface).

[0014] In this embodiment, as shown in Fig. 4, two means are provided to prevent the ceiling panel P from falling, namely, a fall prevention member 70 and a ceiling reinforcement member 80. That is, the suspended ceiling structure 1 includes a siding support 30 (see Figs. 1 and 2), a siding 40 attached to the siding support 30 so as to cross, a mounting member 60 provided on the wall surface B of the building, a ceiling panel P placed between the mounting member 60 and the siding 40 or between the sidings 40, a fall prevention member 70 arranged on the room side of each of the mounting member 60 and the first siding 40 adjacent to the mounting member 60 in the ceiling center direction, and a ceiling reinforcement member 80 arranged on the ceiling back side between the first siding 40 and the second siding 40 adjacent to the first siding 40 in the ceiling center direction.

[0015] First, the fall-off prevention member 70 will be described. The fall-off prevention member 70 involves expanding the width of the flange portion on which the ceiling board P is placed in each of the mounting member 60 and the first siding 40. Since the fall-off prevention member 70 is placed on the indoor side, for example, a flat plate with a straight cross section can be preferably used, taking into consideration the design after construction. However, it is not necessary to be limited to a flat plate, and the cross section may be two-dimensional as long as the required strength and design issues are satisfied.

[0016] The fall prevention member 70 is disposed so as to extend along each of the mounting member 60 and the first siding 40. The ceiling panel P, the flange portion of the mounting member 60 or the first siding 40 (for the first siding 40, the flange portion 41a on the left side in the figure of the flange portion 41), and the fall prevention member 70 are fixed with screws from the indoor side in that order when viewed from the underside of the ceiling. As a result, the ceiling panel P on the outer periphery in the extension direction of the siding support 30 of the suspended ceiling structure 1 (horizontal to the paper surface) is fixed to the mounting member 60 and the first siding 40, and is prevented from falling.

[0017] Next, the ceiling reinforcement member 80 will be described. The ceiling reinforcement member 80 structurally connects the first and second sidings 40 and 40. Because the ceiling reinforcement member 80 is placed on the ceiling side, there is no need to take into consideration the design after construction, and for example, a UL stud with a concave cross section can be suitably used. However, it is not necessary to be limited to a UL stud, and as long as the required strength is satisfied, the cross section may be one-dimensional.

[0018] The ceiling reinforcement member 80 is arranged to extend between the first and second sidings 40. The ceiling reinforcement member 80, the ceiling panel P, and the flange portion of the first or second siding 40 (the flange portion 41b on the right side of the figure for the first siding 40, and the flange portion 41a on the left side of the figure for the second siding 40) are fixed with screws from the indoor side in that order when viewed from the ceiling side. This prevents the adjacent sidings 40 from separating in the extension direction of the siding support 30 (horizontal to the paper surface) in the suspended ceiling structure 1, and prevents the ceiling panel P from falling off. Furthermore, as described later, by providing the ceiling reinforcement member 80 in multiple rows, the curvature (deflection) in the extension direction of the siding 40 can be suppressed, and the ceiling panel P is also prevented from falling off from this point of view.

[0019] The overall arrangement of the above-described fall prevention members 70 and ceiling back reinforcement members 80 in the suspended ceiling structure 1 will be described with reference to Fig. 5. Fig. 5 is a diagram illustrating the overall layout of the suspended ceiling structure 1 in a plan view. Note that the configuration of the suspended ceiling structure 1 when viewed three-dimensionally will be mentioned in advance. The suspended ceiling structure 1 is composed of hanging bolts 10 (see Figs. 1 and 2) hanging down from a structural body such as an upper floor floor slab, joist supports 30 suspended and supported by the hanging bolts 10 via hangers 20 (see Figs. 1 and 2), joist supports 40 attached via clips 50 (see Figs. 3 and 4) so ​​as to intersect with the joist supports 30, and a ceiling panel P fixed or placed on the joist 40.

[0020] 5 shows an example of a rectangular building in plan view on which a suspended ceiling is to be installed, in which (hereinafter, the vertical and horizontal directions are defined according to the direction of the symbols), siding supports 30 are arranged horizontally (the long side of the building, the same below), and sidings 40 are arranged vertically (the short side of the building, the same below). Walls B are located around the periphery of the building, and mounting members 60 are arranged vertically on the wall surfaces B on the left and right outer periphery. Places L for arranging lighting equipment, etc. are provided between the ceiling boards P at a predetermined interval in the vertical direction.

[0021] In this overall layout, the anti-fall-out members 70 are positioned so as to extend vertically along each of the left and right outer peripheral mounting members 60 and the left and right first sills 40 located toward the center of the ceiling when viewed from each mounting member 60, that is, along four lines (represented by thick solid lines).

[0022] Meanwhile, the ceiling reinforcement member 80 is arranged to extend horizontally between the left and right first joists 40. Here, the case where two lines (indicated by dashed lines) are provided horizontally is shown. The distance between these two lines can be set according to the conditions of the building in which the suspended ceiling structure 1 is installed, and although it is of course possible to have three or more lines, if there are no special design conditions, the number of lines can be set to, for example, 3m intervals.

[0023] In Figure 5, the lines of the ceiling reinforcement members 80 are shown diagrammatically as continuous dashed lines, but in actual arrangement, the unit is the section between adjacent rafters 40, as shown in Figure 4.

[0024] 6 to 8, the procedure for the renovation work of attaching the fall prevention members 70 and the ceiling reinforcement members 80 to the existing suspended ceiling structure 1 will be described. Please refer to FIG. 4 for the positional relationship of each member and each part.

[0025] First, referring to the layout diagram of the existing suspended ceiling structure 1, as shown in FIG. 6, the ceiling board P is cut in the extending direction of the joist support 30 near where the joist support 30 extends (cut area C).

[0026] Next, as shown in Fig. 7(a), a ceiling reinforcement member 80 is placed on the ceiling board P near the cut ceiling side so that both ends overlap the flange portions 41 of adjacent rafters 40. Then, as shown in Fig. 7(b), the overlapping portions of the ceiling reinforcement member 80, the ceiling board P, and the flange portions 41b of the first rafter 40 or the flange portions 41a of the second rafter 40 are fixed with screws 90 from the indoor side, as seen from the ceiling side.

[0027] 8, anti-fall-off members 70 are placed on the flange portion of the mounting member 60 and the flange portion 41a of the first rafter 40. Then, the overlapping portions of the ceiling panel P, the flange portion of the mounting member 60 or the flange portion 41a of the first rafter 40, and the anti-fall-off members 70 are fixed with screws 90 from the indoor side at the locations where they overlap when viewed from behind the ceiling.

[0028] (Effects of the embodiment) The suspended ceiling structure 1 of this embodiment comprises a soffit support 30, a soffit 40 attached so as to cross the soffit support 30, a mounting member 60 provided on the wall surface B of a building, a ceiling panel P placed between the mounting member 60 and the soffit 40 or between the soffits 40, an anti-fall-off member 70 arranged on the room side of each of the mounting member 60 and the first soffits 40 adjacent to each other in the direction of the ceiling center when viewed from the mounting member 60, and a ceiling reinforcement member 80 arranged on the ceiling side between the first soffit 40 and the second soffit 40 adjacent to each other in the direction of the ceiling center when viewed from the first soffit 40. Therefore, it can be easily applied as a renovation work for an existing suspended ceiling, and can be a suspended ceiling structure 1 that prevents the ceiling panel P from falling due to shaking during an earthquake.

[0029] Although the embodiments have been described above, the present invention is not limited to the specific embodiments and includes various modifications, which will be apparent to those skilled in the art from the description of the claims. [Explanation of symbols]

[0030] 1. Suspended ceiling structure 10...Hanging bolt 20…Hanger 30…Noenuke 40…Rough edge (first rough edge, second rough edge) 41 (41a, 41b))...Flange portion 50…Clip 60...Placement member 70...Fall prevention member 80…Ceiling reinforcement material B: Building wall P...Ceiling board C…Cut area

Claims

1. A suspended ceiling structure, comprising: With Nobori Uke, A siding attached to the siding support so as to intersect with the siding support; A mounting member provided on a wall surface of a building; A ceiling board placed between the mounting member and the rafters or between the rafters; A fall prevention member is arranged on the indoor side of each of the first sills adjacent to the placement member in the ceiling center direction as seen from the placement member; and a ceiling reinforcement member disposed on the ceiling space between the first wall and a second wall adjacent to the first wall in the ceiling center direction as viewed from the first wall. A suspended ceiling structure characterized by:

2. The fall-off prevention member is provided to enlarge the width of the flange portion on which the ceiling board is placed in each of the mounting member and the first sill.

2. The suspended ceiling structure according to claim 1.

3. The fall-prevention member is arranged to extend along the mounting member and the first sill, and the ceiling board, the mounting member or the first sill, and the fall-prevention member are fixed from the indoor side in that order when viewed from the ceiling back side.

3. A suspended ceiling structure according to claim 1 or 2.

4. The ceiling reinforcement member structurally connects the first and second roof sills.

4. A suspended ceiling structure according to claim 1, wherein the suspended ceiling structure is a ceiling structure having a first wall and a second wall.

5. The ceiling reinforcement member is arranged to extend between the first and second furring strips, and the ceiling reinforcement member, the ceiling board, and the first or second furring strips are fixed from the indoor side in that order when viewed from the ceiling side.

5. A suspended ceiling structure according to claim 1, wherein the suspended ceiling structure is a ceiling structure having a plurality of ceiling members.

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