JP7607281B2 - Suspended ceiling structure - Google Patents

Description

The present invention relates to a suspended ceiling structure.

Conventionally, 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 has been disclosed that prevents the ceiling panels from cracking and falling by surface-joining a surface material having a cable to the underside of the ceiling panel and fastening the cable to the building frame (see Patent Document 1).

JP 2019-206829 A

However, with this conventional technology, the weight of the facing material is applied in addition to the weight of the ceiling panels, which can be counterproductive to weight reduction. Furthermore, even if such fall prevention technology is implemented, if the ceiling panels fall, they will fall with the facing material, which can actually result in more falling objects over a larger area. In addition, when this technology is applied as earthquake-resistant renovation work for existing suspended ceilings, there is an issue that the burden of the renovation work is large because new facing materials must be surface-joined to the ceiling panels.

The present invention was made in consideration of the above circumstances, and aims to provide a suspended ceiling structure that can be easily applied to renovate existing suspended ceilings and prevents ceiling panels from falling off due to shaking during an earthquake.

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 themselves, 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 configuration of (1) above, the anti-fall-off member involves expanding the width of the flange portion on which the ceiling panel 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 rough edge and the second rough edge, and the ceiling reinforcement member, the ceiling board, and the first rough edge or the second rough edge are fixed from the indoor side in that order when viewed from the ceiling side.

The present invention provides a suspended ceiling structure that can be easily applied to repair existing suspended ceilings and prevents ceiling panels from falling off due to shaking during an earthquake.

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. 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. 2A and 2B are diagrams for explaining the state of FIG. 1 as viewed from the extending direction of the rafters, in which FIG. 2A shows the state before vibration and FIG. 2B shows the state during vibration. FIG. 2 is a diagram illustrating an embodiment of the present invention viewed from the extension direction of the rafters. 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; FIG. 1 is a diagram showing an aspect of repair work for an existing suspended ceiling, showing cutting of ceiling panels. FIG. 13 is a diagram showing aspects of renovation work on an existing suspended ceiling, in which (a) shows an aspect in which a ceiling reinforcement member is installed in the ceiling space, and (b) shows an aspect in which the member is fixed with screws from the inside of the room. FIG. 13 is a diagram showing the repair work for an existing suspended ceiling, with anti-fall-off members installed.

(Embodiment)
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following, like elements are designated by like reference numerals throughout the description of the preferred embodiments.

First, the manner in which the ceiling panel P falls off the joist 40 during an earthquake will be described with reference to Figures 1 to 3. Figure 1 shows the manner in which the ceiling panel P falls off due to shaking during an earthquake, where the joist support 30 moves horizontally. Figure 2 shows the manner in which the ceiling panel P falls off due to shaking during an earthquake, where the joist 40 bends. Figure 3 is a schematic diagram of the case in Figure 1, 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 panel P placed on the flange portion.

As shown in FIG. 1, when the distance between adjacent rafters 40 increases due to the shaking of an earthquake, the ceiling panel 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 panel 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 installed on the wall B and the first rafter 40 adjacent to the center of the ceiling as seen from the mounting member 60 increases in a building with a suspended ceiling structure 1, and the ceiling panel P falls 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.

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.

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 from the direction in which the rafters 40 extend (the depth direction relative to the paper surface).

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 soffit support 30 (see FIG. 1 and FIG. 2), a soffit 40 attached to the soffit support 30 so as to cross it, 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 soffit 40 or between the soffits 40, a fall prevention member 70 arranged on the room side of each of the mounting member 60 and the first soffit 40 adjacent to the mounting member 60 in the direction of the ceiling center, and a ceiling reinforcement member 80 arranged on the ceiling back side between the first soffit 40 and the second soffit 40 adjacent to the first soffit 40 in the direction of the ceiling center.

First, the fall prevention member 70 will be described. The fall prevention member 70 involves expanding the width of the flange portion on which the ceiling board P is placed on each of the mounting member 60 and the first siding 40. Since the fall prevention member 70 is placed on the indoor side, it is preferable to use, for example, a flat plate with a straight cross section, 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 met.

The fall prevention member 70 is arranged to extend along each of the mounting member 60 and the first sill 40. The ceiling panel P, the flange portion of the mounting member 60 or the first sill 40 (for the first sill 40, the flange portion 41a on the left side of the figure among the flange portions 41), and the fall prevention member 70 are fixed with screws from the inside of the room in that order when viewed from the underside of the ceiling. As a result, the ceiling panel P on the outer periphery of the extension direction of the sill support 30 of the suspended ceiling structure 1 (horizontal to the page) is fixed to the mounting member 60 and the first sill 40, and is prevented from falling.

Next, the ceiling reinforcement member 80 will be described. The ceiling reinforcement member 80 structurally connects the first siding 40 and the second siding 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.

The ceiling reinforcement member 80 is arranged to extend between the first and second sills 40. The ceiling reinforcement member 80, the ceiling panel P, and the flange portion of the first or second sill 40 (the flange portion 41b on the right side of the figure for the first sill 40, and the flange portion 41a on the left side of the figure for the second sill 40) are fixed with screws from the inside of the room in that order when viewed from the ceiling. This prevents the adjacent sills 40 from separating in the extension direction of the sill 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 sill 40 can be suppressed, and the ceiling panel P is also prevented from falling off from this point.

The overall arrangement of the above-described fall prevention members 70 and ceiling 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. In addition, to touch on the configuration of the suspended ceiling structure 1 when viewed three-dimensionally, the suspended ceiling structure 1 is composed of hanging bolts 10 (see FIGS. 1 and 2) hanging from a structural body such as an upper floor floor slab, siding supports 30 suspended by the hanging bolts 10 via hangers 20 (see FIGS. 1 and 2), siding supports 40 attached via clips 50 (see FIGS. 3 and 4) so as to intersect with the siding supports 30, and a ceiling panel P fixed or placed on the siding supports 40.

Now, Figure 5 shows an example of a rectangular building in plan view on which a suspended ceiling will be installed, with the soffit supports 30 arranged horizontally (the long side of the building, same below) and the soffits 40 arranged vertically (the short side of the building, same below). Walls B are located around the perimeter of the building, and mounting members 60 are arranged vertically on the left and right outer perimeter walls B. Places L for installing lighting equipment, etc. are provided between the ceiling panels P at a specified vertical interval.

In this overall layout, the fall prevention members 70 are positioned so that they extend vertically along the four lines (shown by thick solid lines) 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.

On the other hand, the ceiling reinforcement member 80 is arranged to extend horizontally between the left and right first sills 40. Here, two lines (shown by dashed lines) are shown arranged horizontally. 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 requirements, the number of lines can be set to, for example, 3m apart.

In Figure 5, the lines of the ceiling reinforcement members 80 are shown as a continuous dashed line, but in actual placement, the unit is the section between adjacent rafters 40, as shown in Figure 4.

With reference to Figures 6 to 8, the procedure for the renovation work to attach the fall prevention members 70 and the ceiling reinforcement members 80 to the existing suspended ceiling structure 1 will be explained. Please refer to Figure 4 for the relative positions of each member and each part.

First, referring to the layout diagram of the existing suspended ceiling structure 1, cut the ceiling panel P in the direction in which the soffit support 30 extends near where the soffit support 30 extends (cut area C) as shown in FIG. 6.

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 points 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 when viewed from the ceiling side are fixed with screws 90 from the indoor side.

Then, as shown in FIG. 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 siding 40, respectively. Then, the overlapping points of the ceiling board P, the flange portion of the mounting member 60 or the flange portion 41a of the first siding 40, and the anti-fall-off members 70 are fixed from the indoor side using screws 90.

(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 the building, a ceiling panel P placed between the mounting member 60 and the soffit 40 or between the soffits 40, anti-fall-off members 70 arranged on the room side of each of the first soffits 40 adjacent to the mounting member 60 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 the first soffit 40 in the direction of the ceiling center when viewed from the first soffit 40, and therefore can be a suspended ceiling structure 1 that can be easily applied as a renovation work for an existing suspended ceiling and prevents the ceiling panel P from falling due to shaking during an earthquake.

Although the embodiments have been described above, the present invention is not limited to the specific embodiments and includes various modifications, which will be clear to those skilled in the art from the claims.

1... Suspended ceiling structure 10... Suspension bolt 20... Hanger 30... Rafter support 40... Rafter (first rafter, second rafter)
41 (41a, 41b))... flange portion 50... clip 60... mounting member 70... fall prevention member 80... ceiling underside reinforcement member B... wall surface P of building... ceiling panel C... cut area

Claims (5)

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;
A suspended ceiling structure characterized by comprising a ceiling reinforcement member arranged on the ceiling side between the first sill and the second sill adjacent to the first sill toward the center of the ceiling when viewed from the first sill. The suspended ceiling structure according to claim 1, characterized in that the anti-fall-off member involves expanding the width of the flange portion on which the ceiling board is placed in each of the mounting member and the first sill. A suspended ceiling structure as described in claim 1 or 2, characterized in that 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 inside of the room in that order when viewed from the inside of the ceiling. The suspended ceiling structure according to any one of claims 1 to 3, characterized in that the ceiling reinforcement member structurally connects the first siding and the second siding. A suspended ceiling structure as described in any one of claims 1 to 4, characterized in that the ceiling reinforcement member is arranged to extend between the first and second rough edges, and the ceiling reinforcement member, the ceiling board, and the first or second rough edges are fixed from the indoor side in that order when viewed from the ceiling side.