JP6761387B2 - Ceiling structure - Google Patents

Description

The present invention relates to a ceiling structure of a building provided in a space under an elevated structure.

As the ceiling structure of the building provided in the space under the elevated structure, from the viewpoint of improving comfort or ensuring the arrangement of pipes, the slab which is an elevated structure, that is, a viaduct or a bridge girder is suspended. Ceilings, or suspended ceilings, are used. In addition, when the elevated structure is a railway elevated structure in which a railway is laid on the elevated structure, the ceiling structure of the building provided in the space under the elevated structure leaks water from the elevated structure. As a countermeasure, the ceiling structure is often provided with a double ceiling having an upper ceiling having a folded plate as a waterproof folded plate and a finished ceiling, that is, a lower ceiling as a decorative ceiling.

Japanese Patent Application Laid-Open No. 2014-51792 (Patent Document 1) includes a roofing material attached to a roofing material side member in a roof structure in which a roofing material is suspended from a skeleton, and the roofing material includes a folded plate and a roof. A technique is disclosed in which the material side member has a support member for supporting the roofing material, the support member has a bar screw penetrating the roofing material, and the bar screw can suspend a decorative ceiling.

Japanese Unexamined Patent Publication No. 2014-51792

Suspended ceilings as the ceiling structure of buildings provided in the space under the elevated structure were not previously the subject of structural design. After that, when such a large earthquake occurred, such a fall of the suspended ceiling occurred, so the Building Standards Law was amended in July 2013, and seismic regulations should be established for ceiling structures under certain conditions. It became. However, according to the seismic regulations established at this time, double ceilings are, in principle, out of the scope of application. Therefore, it is desirable to further improve the seismic performance of the double ceiling under the railroad overpass.

In such a double ceiling, the lower ceiling is often suspended from the upper ceiling having the folded plate by a hanging member penetrating the folded plate. Further, in order to suppress the shaking of the lower ceiling when an earthquake occurs, the brace is often fixed to the hanging member and the lower ceiling. However, when the part of the hanging member to which the brace is fixed is separated downward from the part of the hanging member that penetrates the folded plate, the portion of the hanging member that penetrates the folded plate It is easy to displace greatly in the horizontal direction. Therefore, when an earthquake occurs and a load in the horizontal direction is applied to the lower ceiling, the amount of displacement of the lower ceiling in the horizontal direction becomes large, and it is difficult to easily improve the seismic performance of the ceiling structure.

The present invention has been made to solve the above-mentioned problems of the prior art, and provides a ceiling structure capable of easily improving seismic performance in a building provided in a space under an elevated structure. The purpose is to provide.

A brief outline of the typical inventions disclosed in the present application is as follows.

The ceiling structure as one aspect of the present invention is a ceiling structure of a building provided in a space under an elevated structure. The ceiling structure includes a first hanging member hanging from an elevated structure, a first ceiling suspended by the first hanging member, a second hanging member hanging from the first ceiling, and a second hanging member. It includes a second ceiling suspended by a member, and a first brace fixed to the second hanging member and the second ceiling. The first ceiling has a folded plate in which peaks and valleys are alternately provided, and an upper member and a lower member that sandwich the folded plate from both the upper and lower sides. The upper member is suspended by the first hanging member, the folded plate is fixed to the upper member, and the lower member is fixed to the folded plate. A through hole or notch is formed in the lower member, and the second hanging member passes through the through hole or notch. The upper part of the first brace is fixed to the lower part of the second hanging member under the lower member.

Further, as another aspect, the lower member is pressed and fixed by the folded plate, the second hanging member penetrates the mountain portion, and the upper portion of the second hanging member is the upper member on the mountain portion. It may be fixed to.

Further, as another aspect, the valley portion may not be directly connected to either the upper member or the lower member.

Further, as another aspect, the ceiling structure may include a pressing member that presses the lower member against the folded plate.

Further, as another aspect, the second hanging member may have a first hanging bolt fixed to the second ceiling and a first connecting member for connecting the first hanging bolt to the upper member. .. The pressing member may be a first nut screwed into the first hanging bolt. The first hanging bolt passes through a through hole or notch, the first connecting member penetrates the mountain portion, and the upper end portion of the first hanging bolt is fixed to the lower part of the first connecting member, and the first connecting member The upper portion may be fixed to the upper member on the mountain portion. The lower member may be pressed and fixed to the folded plate by the first nut. Then, the upper portion of the first brace may be fixed to the portion of the first hanging bolt below the first nut.

Further, as another aspect, the ceiling structure may include a fixing member for fixing the upper part of the first brace to the portion of the first hanging bolt under the first nut. Then, the fixing member may be adjacent to the first nut in the first direction which is the vertical direction.

Further, as another aspect, the first ceiling may have a first upper angle steel and a first lower angle steel that sandwich the folded plate from both upper and lower sides. The first upper angle steel is provided on the first horizontal plate extending in the second direction in a plan view and the first horizontal end on one side in the width direction of the first horizontal plate, and is the first horizontal. A first vertical plate perpendicular to the plate may be included. The first lower angle steel is provided below the second horizontal plate extending in the second direction in a plan view and the second horizontal end on one side in the width direction of the second horizontal plate, and is in the second horizontal. A second vertical plate perpendicular to the plate may be included. The first upper angle steel may be an upper member, and the second horizontal plate may be a lower member. The first connecting member is provided on the mountain portion and is provided by being connected to the first fixing portion which sandwiches and fixes the first horizontal plate from above and below and the first fixing portion under the first fixing portion. It may include a first bolt penetrating the ridge and a second nut whose upper portion is screwed into the first bolt. Then, the lower portion of the second nut may be screwed into the upper end portion of the first suspension bolt.

Further, as another aspect, the mountain portion and the valley portion may extend in the third direction intersecting the second direction in a plan view, and the second horizontal plate may be constrained in the second direction.

Further, as another aspect, the ceiling structure may include a second brace fixed to the first hanging member and the first ceiling. The first hanging member may have a second hanging bolt, and the upper part of the second brace may be fixed to the upper part of the second hanging bolt.

Further, as another aspect, the first ceiling has a first locking member fixed to the lower member and locked to the folded plate, and the second hanging member penetrates the mountain portion. , The upper part of the second hanging member may be fixed to the upper member on the mountain portion.

Further, as another aspect, the second hanging member may have a third hanging bolt fixed to the second ceiling and a second connecting member for connecting the third hanging bolt to the upper member. .. The third hanging bolt passes through a through hole or notch, the second connecting member penetrates the mountain portion, and the upper end portion of the third hanging bolt is fixed to the lower part of the second connecting member, and the second connecting member The upper portion may be fixed to the upper member on the mountain portion.

Further, as another aspect, the first ceiling may have a second upper angle steel and a second lower angle steel that sandwich the folded plate from both the upper and lower sides. The second upper angle steel is provided on a third horizontal plate extending in the fourth direction in a plan view and a third horizontal end on one side in the width direction of the third horizontal plate, and is a third horizontal plate. A third vertical plate perpendicular to the plate may be included. The second lower angle steel is provided below the fourth horizontal plate extending in the fourth direction in a plan view and the fourth horizontal end on one side in the width direction of the fourth horizontal plate, and is the fourth horizontal. A fourth vertical plate perpendicular to the plate may be included. The second upper angle steel may be an upper member, and the fourth horizontal plate may be a lower member. The first locking member may be a face door that closes the gap between the fourth horizontal plate and the mountain portion. The second connecting member is provided on the mountain portion and is provided by connecting the second fixing portion that sandwiches and fixes the third horizontal plate from above and below and the second fixing portion under the second fixing portion. It may include a second bolt penetrating the ridge and a third nut whose upper portion is screwed into the second bolt. Then, the lower portion of the third nut may be screwed into the upper end portion of the third hanging bolt.

Further, as another aspect, the mountain portion and the valley portion may extend in the fifth direction intersecting the fourth direction in a plan view, and the fourth horizontal plate may be constrained in the fourth direction.

Further, as another aspect, the ceiling structure may include a first hanging member and a third brace fixed to the first ceiling. The first hanging member may have a fourth hanging bolt, and the upper part of the third brace may be fixed to the upper part of the fourth hanging bolt.

Further, as another aspect, the first ceiling has a second locking member fixed to the lower member and locked to the folded plate, and the second hanging member is fixed to the lower member. The second locking member may be fixed to the upper member via a folded plate.

By applying one aspect of the present invention, seismic performance can be easily improved in the ceiling structure of a building provided in the space under the elevated structure.

It is sectional drawing which shows the ceiling structure of the comparative example. It is sectional drawing which shows the ceiling structure of the comparative example. It is sectional drawing which shows the ceiling structure of Embodiment 1. FIG. It is sectional drawing which shows the ceiling structure of Embodiment 1. FIG. It is sectional drawing which shows the ceiling structure of Embodiment 1. FIG. When the ceiling structure of the first embodiment and the ceiling structure of the comparative example are installed in the space under the structure that can be vibrated for testing instead of the actual elevated structure, the load applied in the horizontal direction is changed. It is a graph which shows an example of the load dependence of the displacement amount in the horizontal direction at the time. It is sectional drawing which shows the ceiling structure of the modification of Embodiment 1. It is sectional drawing which shows the ceiling structure of Embodiment 2. FIG. It is a perspective view which shows an example of the locking member which the upper ceiling provided in the ceiling structure of Embodiment 2 has. It is a perspective view which shows another example of the locking member which the upper ceiling provided in the ceiling structure of Embodiment 2 has. It is sectional drawing which shows the ceiling structure of the modification of Embodiment 2.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate changes while maintaining the gist of the invention are naturally included in the scope of the present invention. Further, in order to clarify the description, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the embodiment, but this is just an example, and the interpretation of the present invention is used. It is not limited.

Further, in the present specification and each of the drawings, the same elements as those described above with respect to the above-described drawings may be designated by the same reference numerals, and detailed description thereof may be omitted as appropriate.

Further, in the drawings used in the embodiments, hatching (shading) added to distinguish the structures may be omitted depending on the drawings.

(Embodiment 1)
<Ceiling structure>
The ceiling structure of the first embodiment, which is one embodiment of the present invention, will be described with reference to the ceiling structure of the comparative example. The ceiling structure of the first embodiment and the ceiling structure of the comparative example are the ceiling structures of buildings provided in the space under the elevated structure.

The ceiling structure of the building provided in the space under the elevated structure is suspended from the viaduct, that is, the viaduct or the bridge girder, which is the elevated structure, from the viewpoint of improving comfort or ensuring the arrangement of pipes. Ceilings, or suspended ceilings, are used. In addition, when the elevated structure is a railway elevated structure in which a railway is laid on the elevated structure, the ceiling structure of the building provided in the space under the elevated structure leaks water from the elevated structure. As a countermeasure, the ceiling structure is often provided with a double ceiling having an upper ceiling having a folded plate as a waterproof folded plate and a lower ceiling having a finished ceiling. The ceiling structure of the first embodiment and the ceiling structure of the comparative example described below are also ceiling structures having a double ceiling as the ceiling structure of the building provided in the space under the elevated structure.

1 and 2 are cross-sectional views showing a ceiling structure of a comparative example. 3 to 5 are cross-sectional views showing the ceiling structure of the first embodiment. FIG. 2 shows an enlarged view of the region AR101 surrounded by the alternate long and short dash line in the cross-sectional view shown in FIG. 4 and 5 show an enlarged view of the region AR1 surrounded by the alternate long and short dash line in the cross-sectional view shown in FIG. FIG. 4 shows a cross section perpendicular to the direction perpendicular to the cross section shown in FIG. 3, and FIG. 5 shows a cross section perpendicular to the direction perpendicular to the cross section shown in FIG. 3 in the horizontal plane. Shown. In FIG. 5, the brace 6 and the fixing member 61 are not shown for the sake of simplicity. Further, among FIGS. 1 and 2 showing the ceiling structure of the comparative example, the same elements as those in FIGS. 3 to 5 showing the ceiling structure of the first embodiment are designated by the same reference numerals and will be described in detail. Is omitted as appropriate.

First, a portion of the ceiling structure of the first embodiment similar to the ceiling structure of the comparative example, that is, a portion of the ceiling structure of the comparative example similar to the ceiling structure of the first embodiment will be described.

As shown in FIGS. 1 to 5, the ceiling structure of the first embodiment includes the hanging member 1, the upper ceiling 2, the hanging member 3, and the lower ceiling 4, similarly to the ceiling structure of the comparative example. , Brace 5 and brace 6. The hanging member 1 hangs from the elevated structure 7. As the hanging member 1, for example, a hanging bolt 11 can be used. That is, the hanging member 1 has a hanging bolt 11. The upper ceiling 2 is suspended by a hanging member 1. The hanging member 3 hangs from the upper ceiling 2. The lower ceiling 4 is suspended by a hanging member 3. The brace 5 suppresses the shaking of the upper ceiling 2 when an earthquake occurs, and is fixed to the hanging member 1 and the upper ceiling 2. When the hanging member 1 has the hanging bolt 11, the upper part of the brace 5 is fixed to the upper part of the hanging bolt 11. The brace 6 suppresses the shaking of the lower ceiling 4 when an earthquake occurs, and is fixed to the hanging member 3 and the lower ceiling 4.

Since the ceiling structure of the first embodiment includes a double ceiling having such an upper ceiling 2 and a lower ceiling 4, as described above, the ceiling structure of the first embodiment is under the railroad overpass. Even when it is provided in, it is possible to take measures against water leakage of the viaduct, which is an elevated structure.

The upper ceiling 2 has a folded plate 21 in which peaks 21a and valleys 21b are alternately provided, and an upper member 22 provided on the folded plate 21. That is, the folded plate 21 has a plurality of ridges 21a and a plurality of valleys 21b extending in a certain direction (third direction) in a plan view, and each of the plurality of ridges 21a and a plurality of the ridges 21a. Each of the valleys 21b intersects with the direction in which the plurality of peaks 21a and the plurality of valleys 21b extend in a plan view, and is preferably arranged alternately in a direction orthogonal to each other (second direction). Such a folded plate 21 can be easily formed by bending a metal plate such as a galvalume steel plate (registered trademark) so as to have a wavy shape. Further, the strength of the upper ceiling 2 can be increased by using the folded plate 21 instead of the simple flat plate.

The upper member 22 is suspended by the hanging member 1. On the other hand, the hanging member 3 penetrates the mountain portion 21a of the folded plate 21, and the upper portion of the hanging member 3 is fixed to the upper member 22 on the mountain portion 21a. Specifically, a through hole 21c is formed in the mountain portion 21a of the folded plate 21, and the hanging member 3 passes through the through hole 21c formed in the mountain portion 21a of the folded plate 21. , Penetrates the mountain part 21a. Further, in the present specification, the upper part means a portion located above the intermediate position between the upper end position and the lower end position in the vertical direction.

From the viewpoint of reducing the horizontal displacement of the lower ceiling 4 in the event of an earthquake, which will be described later, to improve seismic performance, the ceiling structure of the first embodiment and the ceiling structure of the comparative example include a brace 5. It may be, but it may not be equipped with the brace 5.

Further, the ceiling structure of the first embodiment is a member different from the hanging member 3 like the ceiling structure of the comparative example, and the mountain portion 21a of the folded plate 21 is pressed and fixed to the upper member 22. It includes a fixing member 8.

Next, a portion of the ceiling structure of the comparative example that is different from the ceiling structure of the first embodiment will be described.

In the ceiling structure of the comparative example shown in FIGS. 1 and 2, unlike the ceiling structure of the first embodiment shown in FIGS. 3 to 5, a lower member 23 (see FIG. 3) is provided under the folded plate 21. The upper ceiling 2 has only a folded plate 21 and an upper member 22. Therefore, as described below, the seismic performance of the ceiling structure cannot be improved.

As described above, the hanging member 3 penetrates the mountain portion 21a, and the upper portion of the hanging member 3 is fixed to the upper member 22 on the mountain portion 21a. On the other hand, as described above, in the ceiling structure of the comparative example, the brace 6 is provided in order to suppress the shaking of the lower ceiling 4 as in the ceiling structure of the first embodiment.

When a through hole is formed in the valley portion 21b and the hanging member 3 penetrates the valley portion 21b, water leakage from the viaduct, which is an elevated structure, leaks downward through the through hole formed in the valley portion 21b. The waterproof performance of the folded plate 21 cannot be improved. Therefore, since the hanging member 3 does not have to penetrate the valley portion 21b by penetrating the mountain portion 21a, the waterproof performance of the folded plate 21 is taken as a measure against water leakage from the viaduct which is an elevated structure. Can be improved.

However, in the ceiling structure of the comparative example, in order to prevent the valley portion 21b of the folded plate 21 from interfering with the brace 6, the portion of the hanging member 3 penetrating the mountain portion 21a where the upper portion of the brace 6 is fixed is fixed. , The hanging member 3 is separated downward from the portion penetrating the mountain portion 21a. Therefore, the portion of the suspension member 3 to which the upper portion of the brace 6 is fixed is likely to be largely displaced in the horizontal direction with respect to the portion of the suspension member 3 that penetrates the mountain portion 21a. Therefore, when an earthquake occurs and a horizontal load is applied to the lower ceiling 4, the amount of displacement of the lower ceiling 4 in the horizontal direction becomes extremely large, and it is extremely difficult to easily improve the seismic performance of the ceiling structure. Is.

On the other hand, in the ceiling structure of the first embodiment shown in FIGS. 3 to 5, unlike the ceiling structure of the comparative example shown in FIGS. 1 and 2, the upper ceiling 2 is provided with the folded plate 21 and the upper member 22 in addition to the folded plate 21 and the upper member 22. It has a lower member 23 provided under the folded plate 21. That is, the upper member 22 and the lower member 23 sandwich the folded plate 21 from both the upper and lower sides. The folded plate 21 is fixed to the upper member 22, and the lower member 23 is pressed and fixed to the folded plate 21. That is, the lower member 23 is fixed to the upper member 22 via the folded plate 21. The lower member 23 is pressed and fixed to the valley portion 21b of the folded plate 21.

The hanging member 3 penetrates the lower member 23. Specifically, a through hole 23a is formed in the lower member 23, and the hanging member 3 allows the lower member 23 to pass through the through hole 23a formed in the lower member 23. Penetrate. Further, the upper portion of the brace 6 is fixed to the lower portion of the lower member 23 of the hanging member 3.

As a result, even when an earthquake occurs and a load in the horizontal direction is applied to the lower ceiling 4, the hanging member 3 is restrained in the horizontal direction within the range of the through hole 23a formed in the lower member 23. , The lower member 23 is pressed by the folded plate 21 and is restrained in the horizontal direction. Therefore, the portion of the hanging member 3 to which the upper portion of the brace 6 is fixed is less likely to be displaced in the horizontal direction with respect to the portion of the hanging member 3 penetrating the mountain portion 21a as compared with the comparative example. In other words, a frictional force acts between the lower member 23 and the valley portion 21b of the folded plate 21 in the horizontal direction of the lower member 23 (the direction in which the horizontal plate 25a described later extends (second direction)). The misalignment is regulated, and the lower member 23 is restrained so as not to be misaligned in the horizontal direction. Therefore, the portion of the hanging member 3 to which the upper portion of the brace 6 is fixed is less likely to be displaced in the horizontal direction. Therefore, when an earthquake occurs and a load in the horizontal direction is applied to the lower ceiling 4, the amount of displacement of the lower ceiling 4 in the horizontal direction can be reduced, and the seismic performance of the ceiling structure can be improved.

Although the diameter of the through hole 23a in a plan view is larger than the diameter of the hanging member 3, it is preferable that the diameter is as close as possible to the diameter of the hanging member 3.

As a result, the hanging member 3 is substantially completely restrained in the horizontal direction by the through hole 23a, so that the portion of the hanging member 3 to which the upper portion of the brace 6 is fixed is the hanging member 3 as compared with the comparative example. Of these, the portion penetrating the mountain portion 21a can hardly be displaced in the horizontal direction. Therefore, when an earthquake occurs and a load in the horizontal direction is applied to the lower ceiling 4, the amount of displacement of the lower ceiling 4 in the horizontal direction can be extremely reduced, and the seismic performance of the ceiling structure can be further improved. it can.

In the example shown in FIGS. 3 to 5, the hanging member 3 exemplifies a case where the hanging member 3 penetrates the lower member 23 by passing through the through hole 23a formed in the lower member 23. Will be explained. However, the lower member 23 may be formed with a notch having a U-shape in a plan view instead of the through hole 23a, and the hanging member 3 may pass through the notch. Even in such a case, as in the case where the through hole 23a is formed in the lower member 23, even when a load in the horizontal direction is applied to the lower ceiling 4, the hanging member 3 is within the notch range. Since the lower member 23 is restrained in the horizontal direction and the lower member 23 is pressed against the folded plate 21, the portion of the hanging member 3 to which the upper portion of the brace 6 is fixed is the suspension member 3 as compared with the comparative example. It becomes difficult to displace in the horizontal direction with respect to the portion penetrating the mountain portion 21a.

Preferably, the valley portion 21b of the folded plate 21 is not directly connected to either the upper member 22 or the lower member 23.

When the valley portion 21b of the folded plate 21 is directly connected to either the upper member 22 or the lower member 23, a through hole is formed in the valley portion 21b, and water leakage from the viaduct, which is an elevated structure, valleys. Since it leaks downward through the through hole formed in the portion 21b, the waterproof performance of the folded plate 21 cannot be improved. On the other hand, when the valley portion 21b of the folded plate 21 is not directly connected to either the upper member 22 or the lower member 23, a through hole is not formed in the valley portion 21b, so that the waterproof performance of the folded plate 21 is improved. be able to.

Next, a preferable form of the ceiling structure of the first embodiment will be described with reference to FIGS. 3 to 5.

Preferably, the ceiling structure of the first embodiment includes a pressing member 31 that presses the lower member 23 against the upper member 22 via the folded plate 21. Further, the pressing member 31 presses the lower member 23 against the folded plate 21. As a result, the folded plate 21 can be sandwiched and fixed by the upper member 22 and the lower member 23 from both the upper and lower sides.

Preferably, the hanging member 3 has a hanging bolt 32 and a connecting member 33. The lower part of the hanging bolt 32 is fixed to the lower ceiling 4. The connecting member 33 connects the hanging bolt 32 to the upper member 22. That is, the hanging bolt 32 is connected to the upper member 22 via the connecting member 33. As the pressing member 31, for example, a nut 31a screwed into the hanging bolt 32 can be used. The hanging bolt 32 penetrates the lower member 23 by passing through the through hole 23a formed in the lower member 23. The connecting member 33 penetrates the mountain portion 21a of the folded plate 21. The upper end of the hanging bolt 32 is fixed to the lower part of the connecting member 33 between the lower member 23 and the mountain portion 21a. The upper portion of the connecting member 33 is fixed to the upper member 22 on the mountain portion 21a. The lower member 23 is pressed and fixed to the upper member 22 by the nut 31a via the folded plate 21. The upper portion of the brace 6 is fixed to the portion of the hanging bolt 32 below the nut 31a. Further, in the present specification, the lower part means a part located below the intermediate position between the upper end position and the lower end position in the vertical direction.

In such a case, the folded plate 21 is sandwiched and fixed between the upper member 22 and the lower member 23 from both the upper and lower sides by the nut 31a screwed into the hanging bolt 32 connected to the upper member 22 via the connecting member 33. can do. The hanging bolt 32 may pass through the notch formed in the lower member 23.

Preferably, the ceiling structure of the first embodiment includes a fixing member 61 for fixing the upper part of the brace 6 to the portion of the hanging bolt 32 below the nut 31a. The fixing member 61 is adjacent to the nut 31a in the vertical direction (first direction).

Consider a case where the ceiling structure of the comparative example includes the fixing member 61 as in the ceiling structure of the first embodiment. However, in the comparative example, the portion of the hanging member 3 that is restrained in the horizontal direction is arranged in the through hole 21c formed in the mountain portion 21a of the folded plate 21 in the hanging member 3, that is, the connecting member 33. It is the part that was done. Therefore, in the comparative example, the portion of the suspension member 3, that is, the suspension bolt 32, to which the upper portion of the brace 6 is fixed is separated from the portion of the suspension member 3 that is restrained in the horizontal direction. Therefore, when an earthquake occurs and a horizontal load is applied to the lower ceiling 4, the amount of displacement in the horizontal direction of the portion of the hanging bolt 32 to which the upper part of the brace 6 is fixed becomes large, and the ceiling structure Seismic performance cannot be improved.

On the other hand, in the ceiling structure of the first embodiment, since the upper ceiling 2 has the lower member 23 and the hanging bolt 32 penetrates the lower member 23, it penetrates the lower member 23 of the hanging bolts 32. The part is constrained horizontally. Therefore, when the fixing member 61 is adjacent to the nut 31a in the vertical direction, the portion of the suspension bolt 32 where the upper portion of the brace 6 is fixed approaches the portion of the suspension member 3 that is restrained in the horizontal direction. .. Therefore, when an earthquake occurs and a load in the horizontal direction is applied to the lower ceiling 4, the amount of displacement in the horizontal direction of the portion of the hanging bolt 32 to which the upper part of the brace 6 is fixed can be reduced, and the ceiling. The seismic performance of the structure can be improved.

In the specification of the present application, the fixing member 61 is adjacent to the nut 31a in the vertical direction when the fixing member 61 comes into contact with the nut 31a in the vertical direction, or the upper end portion of the fixing member 61 in the vertical direction. This means that the distance between the nut 31a and the lower end of the nut 31a is, for example, the diameter of the hanging bolt 32 or less.

The fixing member 61 includes a main body member 62, a connecting member 63, and a mounting bolt member 64.

The main body member 62 fixes the fixing member 61 to the hanging bolt 32 with screws. As the main body member 62, for example, a hexagonal high nut 62a having a vertical screw hole into which the hanging bolt 32 is screwed can be used. The connecting member 63 connects the main body member 62 and the mounting bolt member 64. The mounting bolt member 64 mounts the bolt 65 on the upper part of the brace 6. A bolt 65 is provided at the end of the mounting bolt member 64 mounted on the upper part of the brace 6 on the side opposite to the brace 6 side, and the bolt 65 is screwed into the screw hole 63a formed in the connecting member 63. As a result, the brace 6 is fixed to the suspension bolt 32 via the mounting bolt member 64, the connecting member 63, and the main body member 62.

Preferably, in the ceiling structure of the first embodiment, the upper ceiling 2 has an angle 24 as an upper angle steel and an angle 25 as a lower angle steel that sandwich the folded plate 21 from both the upper and lower sides.

The angle 24 is orthogonal to the horizontal plate 24a extending in a certain direction (second direction) in a plan view and the width direction of the horizontal plate 24a, that is, the direction in which the horizontal plate 24a extends (second direction) in a plan view. Includes a vertical plate 24c provided on the side end 24b on one side in the direction and perpendicular to the horizontal plate 24a. The vertical plate 24c extends in the direction in which the horizontal plate 24a extends (second direction). Further, the above-mentioned upper member 22 is an angle 24. In such an angle 24, the strength against the stress applied from the direction perpendicular to the extending direction of the angle 24 is strong. Therefore, by using the angle 24 as the upper member 22, the strength of the upper ceiling 2 can be increased.

On the other hand, the angle 25 has a horizontal plate 25a extending in the same direction (second direction) as the horizontal plate 24a extending in the plan view and a horizontal plate 25a in the width direction of the horizontal plate 25a, that is, horizontal in the plan view. Includes a vertical plate 25c provided below the side end 25b on one side in a direction orthogonal to the extending direction (second direction) of the plate 25a and perpendicular to the horizontal plate 25a. The vertical plate 25c extends in the direction (second direction) in which the horizontal plate 25a extends. Further, the lower member 23 described above is a horizontal plate 25a having an angle of 25. In such an angle 25, the strength against the stress applied from the direction perpendicular to the extending direction of the angle 25 is strong. Therefore, by using the horizontal plate 25a having an angle 25 as the lower member 23, the strength of the upper ceiling 2 can be increased.

Preferably, in the ceiling structure of the first embodiment, the connecting member 33 includes a fixing portion 33a, a bolt 33b, and a nut 33c. The fixing portion 33a is provided on the mountain portion 21a of the folded plate 21, and fixes the horizontal plate 24a by sandwiching it from above and below. The bolt 33b is provided under the fixing portion 33a in connection with the fixing portion 33a, and penetrates the mountain portion 21a by passing through the through hole 21c formed in the mountain portion 21a of the folded plate 21. The upper part of the nut 33c is screwed into the bolt 33b. The lower portion of the nut 33c is screwed into the upper end portion of the hanging bolt 32. At this time, the hanging bolt 32 penetrates the horizontal plate 25a by passing through the through hole 23a formed in the horizontal plate 25a of the angle 25, and the horizontal plate 25a is the upper member via the folded plate 21 by the nut 31a. 22 is pressed and fixed to the horizontal plate 24a of the angle 24.

As a result, the hanging bolt 32 can be fixed to the angle 24 via the nut 33c, the bolt 33b, and the fixing portion 33a.

A seat stat 33d can be used as a member including the fixing portion 33a and the bolt 33b. In such a case, the fixing portion 33a is a fixing portion of the seat stat 33d, and the bolt 33b is a bolt of the seat stat 33d. is there. Further, a high nut can be used as the nut 33c.

In the ceiling structure of the first embodiment, the fixing member 8 has a fixing portion 83a, a bolt 83b, and a nut 83c. The fixing portion 83a is provided on the mountain portion 21a of the folded plate 21, and fixes the horizontal plate 24a by sandwiching it from above and below. The bolt 83b is provided under the fixing portion 83a in connection with the fixing portion 83a, and penetrates the mountain portion 21a by passing through the through hole 21c formed in the mountain portion 21a of the folded plate 21. The nut 83c is screwed into the bolt 83b. The fixing portion 83a is a fixing portion of the seat stat 83d, and the bolt 83b is a bolt of the seat stat 83d. The ridge portion 21a of the folded plate 21 can be pressed and fixed to the angle 24 which is the upper member 22 by the nut 83c screwed into the bolt 83b.

The mountain portion 21a and the valley portion 21b of the folded plate 21 intersect with the direction in which the horizontal plate 24a and the horizontal plate 25a extend in a plan view (second direction), and preferably extend in a direction orthogonal to each other (third direction). It is preferable to do so. At this time, the lower member 23 is constrained in the direction in which the horizontal plate 25a extends (second direction).

In such a case, one upper member 22 comes into contact with each of the plurality of mountain portions 21a arranged at intervals from each other via the fixed portion 33a, and one lower member 23 is spaced from each other. The folded plate 21 can be sandwiched and fixed by the upper member 22 and the lower member 23 from both the upper and lower sides of the folded plate 21 in a state of being in contact with a plurality of valley portions 21b arranged apart from each other.

In the folded plate 21, the rigidity when the side end on one side in the direction orthogonal to the extending direction of the peak 21a and the valley 21b in the plan view is a fixed end is the rigidity of the peak 21a and the valley in the plan view. It is lower than the rigidity when the side end portion on one side in the extending direction of the portion 21b is a fixed end. On the other hand, the folded plate 21 is sandwiched and fixed by the upper member 22 and the lower member 23 extending in the direction orthogonal to the extending direction of the mountain portion 21a and the valley portion 21b from both the upper and lower sides of the folded plate 21. In a plan view, the rigidity of the entire upper ceiling 2 can be increased when the side end on one side in the direction orthogonal to the extending direction of the mountain portion 21a and the valley portion 21b is used as a fixed end.

As described above, the ceiling structure of the first embodiment may or may not include the brace 5 fixed to the hanging member 1 and the upper ceiling 2. Even in such a case, the ceiling structure of the first embodiment can easily improve the seismic performance as compared with the ceiling structure of the comparative example.

However, when the ceiling structure of the first embodiment is provided with the brace 5, an earthquake occurs and the lower ceiling 4 is horizontal to the lower ceiling 4 as compared with the case where the ceiling structure of the first embodiment is not provided with the brace 5. The amount of displacement of the lower ceiling 4 in the horizontal direction when a load is applied can be reduced, and the seismic performance of the ceiling structure can be improved. Further, the hanging member 1 is preferably a hanging bolt 11, and the upper part of the brace 5 is preferably fixed to the upper part of the hanging bolt 11.

Further, in the ceiling structure of the first embodiment, the lower ceiling 4 may have a ceiling plate material 41, a field edge 42, and a field edge receiver 43. The field edge 42 is provided on the ceiling plate material 41 and extends in a certain direction in a plan view. The field edge receiver 43 is provided on the field edge 42, and extends in a direction intersecting, preferably orthogonal to, the direction in which the field edge 42 extends in a plan view. In such a case, the lower portion of the brace 6 may be fixed to the field edge receiver 43.

FIG. 6 is applied in the horizontal direction when the ceiling structure of the first embodiment and the ceiling structure of the comparative example are installed in the space under the structure that can be vibrated for testing instead of the actual elevated structure. It is a graph which shows an example of the load dependence of the displacement amount in the horizontal direction when a load is changed.

Consider a case where the ceiling structure of the first embodiment shown in FIGS. 3 to 5 and the ceiling structure of the comparative example shown in FIGS. 1 and 2 are installed in the space under the structure that can be vibrated for the test. ..

For example, the distance from the lower surface of the test structure (corresponding to the elevated structure 7) in the vertical direction to the upper surface of the folded plate 21 (distance DS1 in FIGS. 1 and 3) is set to 1500 mm, and the distance from the upper surface of the folded plate 21 to the lower ceiling The distance to the lower surface of No. 4 (distance DS2 in FIGS. 1 and 3) is 500 mm. The distance between the centers of the two hanging bolts 11 adjacent to each other in the extending direction of the upper member 22, that is, the angle 24 (see FIG. 4) (distance DS3 in FIGS. 1 and 3) is 900 mm, and the lower member 23, that is, the angle 25. The distance between the centers of the two hanging members 3 adjacent to each other in the extending direction of the horizontal plate 25a (see FIG. 4) (distance DS4 in FIGS. 1 and 3) is set to 800 mm. The width of the horizontal plate 24a of the angle 24 is 65 mm, the height of the vertical plate 24c of the angle 24 is 65 mm, and the thickness of each of the horizontal plate 24a and the vertical plate 24c of the angle 24 is 6 mm. Further, the width of the horizontal plate 25a of the angle 25 is 65 mm, the height of the vertical plate 25c of the angle 25 is 65 mm, and the thickness of each of the horizontal plate 25a and the vertical plate 25c of the angle 25 is 6 mm. Further, for each of the plurality of folded plate members forming the folded plate 21, the thickness of the galvalume steel plate (registered trademark) forming the folded plate 21 is set to 0.6 mm, and the height of the folded plate 21, that is, the valley in the vertical direction. The height of the mountain part with respect to the part is 85 mm.

For two ceiling structures having such a shape, the load dependence of the horizontal displacement amount of the lower ceiling when a load is applied to the structure in the horizontal direction and the load applied in the horizontal direction is changed. I'm measuring. At this time, as shown in FIG. 6, when the horizontal displacement amount in the ceiling structure of the comparative example is 100%, the horizontal displacement amount in the ceiling structure of the first embodiment is reduced to 71%. There is. Therefore, according to the ceiling structure of the first embodiment, it is possible to reduce the amount of displacement of the lower ceiling in the horizontal direction when an earthquake occurs and a load in the horizontal direction is applied to the lower ceiling. It has been clarified that seismic performance can be improved.

<Modification example of ceiling structure>
In the ceiling structure of the first embodiment, the case where the pressing member 31 that presses the lower member 23 against the upper member 22 via the folded plate 21 is a nut 31a screwed into the hanging bolt 32 has been described. However, the pressing member 31 does not have to be a nut screwed into the hanging bolt 32. In the following, although the pressing member 31 presses the lower member 23 against the upper member 22 via the folded plate 21, it is not screwed into the hanging bolt 32 and is screwed into a bolt different from the hanging bolt 32. An example of this will be described.

FIG. 7 is a cross-sectional view showing a ceiling structure of a modified example of the first embodiment. FIG. 7 shows a cross section perpendicular to the direction perpendicular to the cross section shown in FIG. 4, and a part of the cross section shown in FIG. 3 is enlarged and shown in the same manner as in FIG.

As shown in FIG. 7, the ceiling structure of this modified example is a member different from the hanging member 3, and includes a fixing member 9 for fixing the folded plate 21.

The fixing member 9 has a bolt 91 and a connecting member 92. The connecting member 92 connects the bolt 91 to the upper member 22. The pressing member 31 is a nut 93 screwed into the bolt 91. The bolt 91 penetrates the lower member 23 by passing through the through hole 23a formed in the lower member 23. The connecting member 92 penetrates the mountain portion 21a by passing through the through hole 21c formed in the mountain portion 21a of the folded plate 21. The upper end of the bolt 91 is fixed to the lower part of the connecting member 92 between the lower member 23 and the mountain portion 21a. The upper portion of the connecting member 92 is fixed to the upper member 22 on the mountain portion 21a. The lower member 23 is pressed and fixed to the upper member 22 by the nut 93 via the folded plate 21. In such a case, the folded plate 21 is sandwiched and fixed between the upper member 22 and the lower member 23 from both the upper and lower sides by the nut 93 screwed into the bolt 91 connected to the upper member 22 via the connecting member 92. be able to.

In addition, the lower member 23 may be formed with a notch having a U-shape in a plan view instead of the through hole 23a, and the bolt 91 may pass through the notch.

Preferably, in the ceiling structure of the present modification, the connecting member 92 includes a fixing portion 92a, a bolt 92b, and a nut 92c. The fixing portion 92a is provided on the mountain portion 21a of the folded plate 21, and fixes the horizontal plate 24a by sandwiching it from above and below. The bolt 92b is provided under the fixing portion 92a and penetrates the mountain portion 21a of the folded plate 21. The nut 92c is screwed into the bolt 92b. The fixing portion 92a is a fixing portion of the seat stat 92d, and the bolt 92b is a bolt of the seat stat 92d. The ridge portion 21a of the folded plate 21 can be pressed and fixed to the angle 24 which is the upper member 22 by the nut 92c screwed into the bolt 92b.

Also in this modification, as in the first embodiment, the portion of the hanging member 3 to which the upper portion of the brace 6 is fixed is the portion of the hanging member 3 that penetrates the mountain portion 21a as compared with the comparative example. On the other hand, it becomes difficult to displace in the horizontal direction. Therefore, when an earthquake occurs and a load in the horizontal direction is applied to the lower ceiling 4, the amount of displacement of the lower ceiling 4 in the horizontal direction can be reduced, and the seismic performance of the ceiling structure can be improved.

In this modification, the nut 31a (see FIG. 4) may not be screwed to the suspension bolt 32. At this time, the fixing member 61 for fixing the upper portion of the brace 6 to the lower portion of the lower member 23 of the hanging bolt 32 is adjacent to the horizontal plate 25a of the angle 25 which is the lower member 23 in the vertical direction.

(Embodiment 2)
In the ceiling structure of the first embodiment, the lower member 23 is restrained in the horizontal direction by being pressed by the folded plate 21. On the other hand, the lower member 23 may be restrained in the horizontal direction by fixing the lower member 23 to, for example, a locking member which is a face door and locking the locking member to the folded plate 21. Such an example will be described as the ceiling structure of the second embodiment. The ceiling structure of the second embodiment is also the ceiling structure of the building provided in the space under the elevated structure, like the ceiling structure of the first embodiment.

In the ceiling structure of the second embodiment, each part other than the upper ceiling 2 can be the same as each part provided in the ceiling structure of the first embodiment described with reference to FIG. 3 described above. The description will be omitted. That is, the ceiling structure of the second embodiment is also the same as the ceiling structure of the first embodiment, that is, the hanging member 1, the upper ceiling 2, the hanging member 3, the lower ceiling 4, the brace 5, and the brace. 6. However, the description of the portion other than the upper ceiling 2, that is, the hanging member 1, the hanging member 3, the lower ceiling 4, the brace 5, and the brace 6 will be omitted. The brace 5 suppresses the shaking of the upper ceiling 2 when an earthquake occurs, and is fixed to the hanging member 1 and the upper ceiling 2. When the hanging member 1 has the hanging bolt 11, the upper part of the brace 5 is fixed to the upper part of the hanging bolt 11.

FIG. 8 is a cross-sectional view showing the ceiling structure of the second embodiment. FIG. 8 shows an enlarged area corresponding to the region AR1 surrounded by the alternate long and short dash line in the cross-sectional view shown in FIG. 3 in the first embodiment in the ceiling structure of the second embodiment. FIG. 9 is a perspective view showing an example of a locking member included in the upper ceiling provided in the ceiling structure of the second embodiment. FIG. 10 is a perspective view showing another example of the locking member included in the upper ceiling provided in the ceiling structure of the second embodiment. The locking member shown in FIG. 10 has a shape in which the upper portion of the locking member shown in FIG. 9 is deleted.

As shown in FIG. 8, the upper ceiling 2 provided in the ceiling structure of the second embodiment is also a folded plate 21 like the upper ceiling 2 provided in the ceiling structure of the first embodiment shown in FIG. And the upper member 22. Regarding the folded plate 21 and the upper member 22 of the upper ceiling 2 provided in the ceiling structure of the second embodiment, the folded plate 21 and the upper member 22 of the upper ceiling 2 provided in the ceiling structure of the second embodiment. 22 can be the same, and the description thereof will be omitted.

Similar to the upper ceiling 2 provided in the ceiling structure of the first embodiment, the upper ceiling 2 provided in the ceiling structure of the second embodiment is also under the folded plate 21 in addition to the folded plate 21 and the upper member 22. It has a lower member 23 provided in the. That is, the upper member 22 and the lower member 23 sandwich the folded plate 21 from both the upper and lower sides. The folded plate 21 is fixed to the upper member 22, and the lower member 23 is fixed to the folded plate 21. That is, the lower member 23 is fixed to the upper member 22 via the folded plate 21.

On the other hand, in the ceiling structure of the second embodiment, unlike the ceiling structure of the first embodiment, the upper ceiling 2 has a locking member 26 fixed to the lower member 23 and locked to the folded plate 21. Have. As the locking member 26, a face door 27 that closes the gap between the mountain portion 21a of the folded plate 21 and the lower member 23 can be used. As shown in FIGS. 8 and 9, the face door 27 has a main body portion 27a, a lower bottom surface portion 27b, an upper bottom surface portion 27c, and two slope portions 27d. The main body 27a has a trapezoidal shape having a lower base, an upper base shorter than the lower base, and two hypotenuses arranged on both the left and right sides. A lower bottom surface portion 27b is connected to the lower bottom side of the main body portion 27a, an upper bottom surface portion 27c is connected to the upper bottom side of the main body portion 27a, and two slope portions are connected to each of the two hypotenuses of the main body portion 27a. 27d are connected respectively. That is, the face door 27 has a trapezoidal shape capable of closing the gap between the mountain portion 21a of the folded plate 21 and the lower member 23.

In the second embodiment as well, the hanging member 3 penetrates the lower member 23 as in the first embodiment. Specifically, a through hole 23a is formed in the lower member 23, and the hanging member 3 allows the lower member 23 to pass through the through hole 23a formed in the lower member 23. Penetrate. Further, the upper portion of the brace 6 is fixed to the lower portion of the lower member 23 of the hanging member 3.

Also in the second embodiment, similarly to the first embodiment, preferably, the valley portion 21b of the folded plate 21 is not directly connected to either the upper member 22 or the lower member 23.

Also in the second embodiment, similarly to the first embodiment, the hanging member 3 preferably has a hanging bolt 32 and a connecting member 33. The lower part of the hanging bolt 32 is fixed to the lower ceiling 4 (see FIG. 3). The connecting member 33 connects the hanging bolt 32 to the upper member 22. That is, the hanging bolt 32 is connected to the upper member 22 via the connecting member 33. The hanging bolt 32 penetrates the lower member 23. The connecting member 33 penetrates the mountain portion 21a of the folded plate 21. The upper end of the hanging bolt 32 is fixed to the lower part of the connecting member 33 between the lower member 23 and the mountain portion 21a. The upper portion of the connecting member 33 is fixed to the upper member 22 on the mountain portion 21a. The upper portion of the brace 6 is fixed to the portion of the hanging bolt 32 below the nut 31a.

The ceiling structure of the second embodiment includes a support member 31b instead of the pressing member 31 provided in the ceiling structure of the first embodiment. As the support member 31b, for example, a nut 31a screwed into the suspension bolt 32 can be used. Further, in the second embodiment, unlike the first embodiment, the folded plate 21 is not fixed by being sandwiched between the upper member 22 and the lower member 23 from both the upper and lower sides by the nut 31a screwed into the hanging bolt 32. You may. In the second embodiment, it is sufficient that the height position of the lower member 23 can be adjusted by supporting the lower member 23 by the nut 31a, and the folded plate is formed by the lower member 23 supported by the nut 31a. It is not necessary to press 21.

Similar to the ceiling structure of the first embodiment, the ceiling structure of the second embodiment preferably includes a fixing member 61 for fixing the upper portion of the brace 6 to the portion of the hanging bolt 32 below the nut 31a. There is. The fixing member 61 is adjacent to the nut 31a in the vertical direction. Further, also in the second embodiment, as in the first embodiment, the fixing member 61 has a main body member 62, a connecting member 63, and a mounting bolt member 64.

Also in the second embodiment, similarly to the first embodiment, preferably, the upper ceiling 2 has an angle 24 as an upper angle steel and an angle as a lower angle steel sandwiching the folded plate 21 from both the upper and lower sides. Has 25.

The angle 24 is orthogonal to the horizontal plate 24a extending in a certain direction (fourth direction) in a plan view and the width direction of the horizontal plate 24a, that is, the direction in which the horizontal plate 24a extends (fourth direction) in a plan view. Includes a vertical plate 24c provided on the side end 24b (see FIG. 5) on one side in the direction and perpendicular to the horizontal plate 24a. The vertical plate 24c extends in the direction in which the horizontal plate 24a extends (fourth direction). Further, the above-mentioned upper member 22 is an angle 24. In such an angle 24, the strength against the stress applied from the direction perpendicular to the extending direction of the angle 24 is strong. Therefore, by using the angle 24 as the upper member 22, the strength of the upper ceiling 2 can be increased.

On the other hand, the angle 25 has a horizontal plate 25a extending in the same direction (fourth direction) as the horizontal plate 24a extending in the plan view and a horizontal plate 25a in the width direction of the horizontal plate 25a, that is, horizontal in the plan view. A vertical plate 25c provided below the side end 25b (see FIG. 5) on one side in a direction orthogonal to the extending direction (fourth direction) of the plate 25a and perpendicular to the horizontal plate 25a. ,including. The vertical plate 25c extends in the direction in which the horizontal plate 25a extends (fourth direction). Further, the lower member 23 described above is a horizontal plate 25a having an angle of 25. In such an angle 25, the strength against the stress applied from the direction perpendicular to the extending direction of the angle 25 is strong. Therefore, by using the horizontal plate 25a having an angle 25 as the lower member 23, the strength of the upper ceiling 2 can be increased.

Also in the second embodiment, similarly to the first embodiment, the connecting member 33 preferably includes a fixing portion 33a, a bolt 33b, and a nut 33c. The fixing portion 33a is provided on the mountain portion 21a of the folded plate 21, and fixes the horizontal plate 24a by sandwiching it from above and below. The bolt 33b is provided under the fixing portion 33a in connection with the fixing portion 33a, and penetrates the mountain portion 21a by passing through the through hole 21c formed in the mountain portion 21a of the folded plate 21. That is, the connecting member 33, in other words, the hanging member 3, penetrates the mountain portion 21a. The upper part of the nut 33c is screwed into the bolt 33b. The lower portion of the nut 33c is screwed into the upper end portion of the hanging bolt 32. At this time, the hanging bolt 32 penetrates the horizontal plate 25a by passing through the through hole 23a formed in the horizontal plate 25a of the angle 25 as the lower member 23, and the horizontal plate 25a is made of the folded plate 21 by the nut 31a. Is pressed and fixed to the upper member 22, that is, the horizontal plate 24a of the angle 24. As a result, the hanging bolt 32 can be fixed to the angle 24 via the nut 33c, the bolt 33b, and the fixing portion 33a.

In addition, the horizontal plate 25a as the lower member 23 may be formed with a notch having a U-shape in a plan view instead of the through hole 23a, and the hanging member 3 passes through the notch. May be good.

A seat stat 33d can be used as a member including the fixing portion 33a and the bolt 33b. In such a case, the fixing portion 33a is a fixing portion of the seat stat 33d, and the bolt 33b is a bolt of the seat stat 33d. is there. At this time, the upper portion of the hanging member 3 is fixed to the upper member 22 on the mountain portion 21a. Further, a high nut can be used as the nut 33c.

On the other hand, as described above, in the second embodiment, unlike the first embodiment, the upper ceiling 2 has a locking member 26. As the locking member 26, as shown in FIGS. 8 and 9, a face door 27 that closes the gap between the mountain portion 21a of the folded plate 21 and the horizontal plate 25a as the lower member 23 can be used. As described above, the face door 27 has a main body portion 27a, a lower bottom surface portion 27b, an upper bottom surface portion 27c, and two slope portions 27d. The face door 27 has a shape that can be fitted in the gap between the mountain portion 21a of the folded plate 21 and the lower member 23, and the gap between the mountain portion 21a of the folded plate 21 and the lower member 23. By fitting to, the gap between the mountain portion 21a of the folded plate 21 and the lower member 23 can be closed.

Further, the ceiling structure of the second embodiment is different from the ceiling structure of the first embodiment, and includes a fixing member 28 for fixing the locking member 26 to the horizontal plate 25a of the lower member 23. The fixing member 28 has a bolt 28a, a nut 28b, and a nut 28c. The bolt 28a passes through a notch 27e having a U-shape in a plan view formed in the lower bottom surface portion 27b of the face door 27 as a locking member 26, and passes through a through hole 23a formed in the lower member 23. As a result, it penetrates the lower member 23. The lower bottom surface portion 27b of the face door 27 and the lower member 23 can be sandwiched and fixed from both the upper and lower sides by the nut 28b and the nut 28c screwed into the bolt 28a. As the locking member 26, a tight frame in which peaks and valleys are alternately provided is used instead of the face door, and as the fixing member 28, the tight frame and the lower member 23 are sandwiched from both the upper and lower sides. It is also possible to use a fixing member for fixing.

The hanging member 3 passes through a through hole 23a formed in the lower member 23, the lower member 23 is fixed to the locking member 26, and the locking member 26 is horizontally restrained by the folded plate 21. .. As a result, even when an earthquake occurs and a load in the horizontal direction is applied to the lower ceiling 4, the hanging member 3 is restrained in the horizontal direction within the range of the through hole 23a formed in the lower member 23. , The lower member 23 is locked to the locking member 26 fixed to the folded plate 21 and is restrained in the horizontal direction. Therefore, also in the second embodiment, as in the first embodiment, the portion of the hanging member 3 to which the upper portion of the brace 6 is fixed has a mountain portion 21a of the hanging member 3 as compared with the comparative example. It becomes difficult to displace in the horizontal direction with respect to the penetrating part. In other words, the locking member 26 is locked to the folded plate 21, and a regulatory force that regulates the misalignment of the locking member 26 acts between the locking member 26 and the folded plate 21, so that the lower member 23 Positional deviation in the horizontal direction (direction in which the horizontal plate 25a extends (fourth direction)) is regulated. Therefore, the portion of the hanging member 3 to which the upper portion of the brace 6 is fixed is less likely to be displaced in the horizontal direction. Therefore, when an earthquake occurs and a load in the horizontal direction is applied to the lower ceiling 4, the amount of displacement of the lower ceiling 4 in the horizontal direction can be reduced, and the seismic performance of the ceiling structure can be improved.

The bolt 28a may penetrate the lower bottom surface portion 27b of the face door 27 as the locking member 26 by passing through a through hole formed in place of the notch 27e.

Further, although not shown in FIG. 8, even if the face door 29 as the locking member 26 shown in FIG. 10 is arranged between the mountain portion 21a near the connecting member 33 and the lower member 23. Good. As shown in FIG. 10, the face door 29 has a shape in which the upper portion of the face door 27 is removed so as not to interfere with the nut 33c of the connecting member 33.

Further, the ceiling structure of the second embodiment is a member different from the hanging member 3 like the ceiling structure of the first embodiment, and the mountain portion 21a of the folded plate 21 is pressed against the upper member 22. A fixing member 8 for fixing may be provided. The fixing member 8 has a fixing portion 83a, a bolt 83b, and a nut 83c. The fixing portion 83a is provided on the mountain portion 21a of the folded plate 21, and fixes the horizontal plate 24a by sandwiching it from above and below. The bolt 83b is provided under the fixing portion 83a in connection with the fixing portion 83a, and penetrates the mountain portion 21a by passing through the through hole 21c formed in the mountain portion 21a of the folded plate 21. Further, the bolt 83b passes through the notch 27f formed in the upper bottom surface portion 27c of the face door 27 which is the locking member 26. The nut 83c is screwed into the bolt 83b. The fixing portion 83a is a fixing portion of the seat stat 83d, and the bolt 83b is a bolt of the seat stat 83d. With the nut 83c screwed into the bolt 83b, the upper bottom surface portion 27c of the face door 27 can be pressed and fixed to the angle 24 which is the upper member 22 via the mountain portion 21a of the folded plate 21.

The mountain portion 21a and the valley portion 21b of the folded plate 21 intersect with the direction in which the horizontal plate 24a and the horizontal plate 25a extend in a plan view (fourth direction), and preferably extend in a direction orthogonal to each other (fifth direction). It is preferable to do so. At this time, the lower member 23 is constrained in the direction in which the horizontal plate 25a extends (fourth direction).

<Modification example of ceiling structure>
In the ceiling structure of the second embodiment, the hanging bolt 32 is connected to the upper member 22 via the connecting member 33. However, the hanging bolt 32 does not have to be connected to the upper member 22. In the following, an example in which the hanging bolt 32 is not connected to the upper member 22, but is connected to the lower member 23, that is, an example in which the hanging member 3 is fixed to the lower member 23 is carried out. This will be described as a modification of the second embodiment.

FIG. 11 is a cross-sectional view showing a ceiling structure of a modified example of the second embodiment. FIG. 11 shows a cross section perpendicular to the direction perpendicular to the cross section shown in FIG. 8 and is a two-dot chain line in the cross section shown in FIG. 3 in the first embodiment, similarly to the cross section shown in FIG. The area corresponding to the area AR1 surrounded by is enlarged and shown.

As shown in FIG. 11, in the present modification, unlike the second embodiment, the hanging member 3 has the hanging bolt 32, but does not have the connecting member 33 (see FIG. 8). The lower part of the hanging bolt 32 is fixed to the lower ceiling 4 (see FIG. 3). The hanging bolt 32 penetrates the lower member 23 by passing through the through hole 23a formed in the horizontal plate 25a of the lower member 23. The lower member 23 can be sandwiched and fixed from both the upper and lower sides by the nut 31a and the nut 31c screwed into the hanging bolt 32. As a result, the hanging bolt 32 can be connected to and fixed to the lower member 23.

In addition, the horizontal plate 25a of the lower member 23 may be formed with a notch having a U-shape in a plan view instead of the through hole 23a, and the suspension bolt 32 may pass through the notch.

In this modified example as well, as in the second embodiment, the upper ceiling 2 has a locking member 26 fixed to the lower member 23 and locked to the folded plate 21. The locking member 26 is fixed to the upper member 22 via the folded plate 21. On the other hand, in this modification, unlike the second embodiment, the hanging member 3 is fixed to the lower member 23. In the ceiling structure of this modification, similarly to the ceiling structure of the second embodiment, the fixing member 28 for fixing the locking member 26 to the horizontal plate 25a of the lower member 23 and the mountain portion 21a of the folded plate 21 are provided. A fixing member 8 that is pressed and fixed to the upper member 22 may be provided.

In this modified example as well, as in the second embodiment, the hanging member 3 is horizontally restrained within the range of the through hole 23a formed in the lower member 23, so that the brace 6 of the hanging members 3 Compared to the comparative example, the portion where the upper portion is fixed is less likely to be displaced in the horizontal direction with respect to the portion of the hanging member 3 that penetrates the mountain portion 21a. Therefore, when an earthquake occurs and a load in the horizontal direction is applied to the lower ceiling 4, the amount of displacement of the lower ceiling 4 in the horizontal direction can be reduced, and the seismic performance of the ceiling structure can be improved.

Although not shown in FIG. 11, even if the horizontal plate 25a does not have a through hole 23a or a notch and the hanging member 3 has the same connecting member as the connecting member 33 (see FIG. 8). Often, the connecting member includes a fixing portion similar to the fixing portion 33a (see FIG. 8), a bolt similar to the bolt 33b (see FIG. 8), and a nut similar to the nut 33c (see FIG. 8). But it may be. Further, the fixing portion similar to the fixing portion 33a may be fixed by sandwiching the horizontal plate 25a from above and below, and as a member including the fixing portion similar to the fixing portion 33a and the bolt similar to the bolt 33b, the sheet A seat stat similar to the stat 33d (see FIG. 8) may be used.

In such a case, the hanging member 3 does not penetrate the mountain portion 21a of the folded plate 21, and the upper portion of the hanging member 3 is not fixed to the upper member 22 on the mountain portion 21a. However, since the hanging member 3 is fixed to the lower member 23, the hanging member 3 is restrained in the horizontal direction with respect to the lower member 23, and the lower member 23 is locked to the folded plate 21. Restrained horizontally. Therefore, when an earthquake occurs and a load in the horizontal direction is applied to the lower ceiling 4, the amount of displacement of the lower ceiling 4 in the horizontal direction can be reduced, and the seismic performance of the ceiling structure can be improved.

Although the invention made by the present inventor has been specifically described above based on the embodiment thereof, the present invention is not limited to the embodiment and can be variously modified without departing from the gist thereof. Needless to say.

Within the scope of the idea of the present invention, those skilled in the art can come up with various modified examples and modified examples, and it is understood that these modified examples and modified examples also belong to the scope of the present invention.

For example, a person skilled in the art appropriately adds, deletes, or changes the design of each of the above-described embodiments, or adds, omits, or changes the conditions of the process of the present invention. As long as it has a gist, it is included in the scope of the present invention.

The present invention is effective when applied to the ceiling structure of a building provided in the space under the elevated structure.

1, 3 Suspension member 2 Upper ceiling 4 Lower ceiling 5, 6 Brace 7 Elevated structure 8, 9, 28, 61 Fixing member 11, 32 Suspension bolt 21 Folded plate 21a Mountain part 21b Valley part 21c, 23a Through hole 22 Upper side Member 23 Lower member 24, 25 Angle 24a, 25a Horizontal plate 24b, 25b Side end 24c, 25c Vertical plate 26 Locking member 27, 29 Face door 27a Main body 27b Lower bottom 27c Upper bottom 27d Slope 27e, 27f Notch 28a, 33b, 65, 83b, 91, 92b Bolt 28b, 28c, 31a, 31c, 33c, 83c, 92c, 93 Nut 31 Pressing member 31b Support member 33, 92 Connecting member 33a, 83a, 92a Fixing part 33d , 83d, 92d Seat stat 41 Ceiling plate material 42 Field edge 43 Field edge receiver 62 Main body member 62a High nut 63 Connecting member 63a Screw hole 64 Mounting bolt member AR1 area DS1 to DS4 Distance

Claims (15)

In the ceiling structure of a building provided in the space under the elevated structure
The first hanging member hanging from the elevated structure and
The first ceiling suspended by the first hanging member and
The second hanging member hanging from the first ceiling and
The second ceiling suspended by the second hanging member and
The first brace fixed to the second hanging member and the second ceiling,
With
The first ceiling is
Folded plates with alternating mountains and valleys,
An upper member and a lower member that sandwich the folded plate from both the upper and lower sides,
Have,
The upper member is suspended by the first suspension member.
The folded plate is fixed to the upper member and
The lower member is fixed to the folded plate and
A through hole or notch is formed in the lower member.
The second hanging member passes through the through hole or the notch and passes through the through hole or the notch.
The upper part of the first brace is a ceiling structure fixed to a portion of the second hanging member below the lower member. In the ceiling structure according to claim 1,
The lower member is pressed and fixed to the folded plate, and is fixed.
The second hanging member penetrates the mountain portion and
The upper part of the second hanging member is a ceiling structure fixed to the upper member on the mountain portion. In the ceiling structure according to claim 2,
The valley portion is a ceiling structure that is not directly connected to either the upper member or the lower member. In the ceiling structure according to claim 2 or 3.
A ceiling structure including a pressing member that presses the lower member against the folded plate. In the ceiling structure according to claim 4,
The second hanging member is
The first hanging bolt fixed to the second ceiling and
A first connecting member that connects the first hanging bolt to the upper member,
Have,
The pressing member is a first nut screwed into the first hanging bolt.
The first hanging bolt passes through the through hole or the notch,
The first connecting member penetrates the mountain portion and
The upper end of the first hanging bolt is fixed to the lower part of the first connecting member.
The upper part of the first connecting member is fixed to the upper member on the mountain portion.
The lower member is pressed and fixed to the folded plate by the first nut.
The upper portion of the first brace is a ceiling structure fixed to a portion of the first hanging bolt below the first nut. In the ceiling structure according to claim 5,
A fixing member for fixing the upper part of the first brace to the portion of the first hanging bolt below the first nut is provided.
The fixing member has a ceiling structure adjacent to the first nut in the first direction which is the vertical direction. In the ceiling structure according to claim 5 or 6,
The first ceiling has a first upper angle steel and a first lower angle steel that sandwich the folded plate from both upper and lower sides.
The first upper angle steel is
A first horizontal plate extending in the second direction in a plan view,
A first vertical plate provided on the first side end portion on one side in the width direction of the first horizontal plate and perpendicular to the first horizontal plate, and
Including
The first lower angle steel is
A second horizontal plate extending in the second direction in a plan view,
A second vertical plate provided below the second side end on one side in the width direction of the second horizontal plate and perpendicular to the second horizontal plate, and
Including
The first upper angle steel is the upper member.
The second horizontal plate is the lower member and is
The first connecting member is
A first fixing portion provided on the mountain portion and fixing the first horizontal plate by sandwiching it from above and below.
A first bolt that is provided under the first fixing portion in connection with the first fixing portion and penetrates the mountain portion.
A second nut whose upper part is screwed into the first bolt,
Including
The lower part of the second nut is a ceiling structure screwed to the upper end of the first hanging bolt. In the ceiling structure according to claim 7.
The mountain portion and the valley portion extend in a third direction intersecting the second direction in a plan view.
The second horizontal plate has a ceiling structure that is constrained in the second direction. In the ceiling structure according to any one of claims 2 to 8.
A second brace fixed to the first hanging member and the first ceiling is provided.
The first hanging member has a second hanging bolt.
The upper part of the second brace is a ceiling structure fixed to the upper part of the second hanging bolt. In the ceiling structure according to claim 1,
The first ceiling has a first locking member fixed to the lower member and locked to the folded plate.
The second hanging member penetrates the mountain portion and
The upper part of the second hanging member is a ceiling structure fixed to the upper member on the mountain portion. In the ceiling structure according to claim 10,
The second hanging member is
With the third hanging bolt fixed to the second ceiling,
A second connecting member that connects the third hanging bolt to the upper member,
Have,
The third hanging bolt passes through the through hole or the notch.
The second connecting member penetrates the mountain portion and
The upper end of the third hanging bolt is fixed to the lower part of the second connecting member.
The upper portion of the second connecting member is a ceiling structure fixed to the upper member on the mountain portion. In the ceiling structure according to claim 11,
The first ceiling has a second upper angle steel and a second lower angle steel that sandwich the folded plate from both upper and lower sides.
The second upper angle steel is
A third horizontal plate extending in the fourth direction in a plan view,
A third vertical plate provided on the third side end of one side in the width direction of the third horizontal plate and perpendicular to the third horizontal plate, and
Including
The second lower angle steel is
A fourth horizontal plate extending in the fourth direction in a plan view,
A fourth vertical plate provided below the fourth side end on one side in the width direction of the fourth horizontal plate and perpendicular to the fourth horizontal plate, and
Including
The second upper angle steel is the upper member.
The fourth horizontal plate is the lower member, and is
The first locking member is a face door that closes a gap between the fourth horizontal plate and the mountain portion.
The second connecting member is
A second fixing portion provided on the mountain portion and fixing the third horizontal plate by sandwiching it from above and below.
A second bolt that is provided under the second fixing portion in connection with the second fixing portion and penetrates the mountain portion.
A third nut whose upper part is screwed into the second bolt,
Including
The lower part of the third nut is a ceiling structure screwed to the upper end of the third hanging bolt. In the ceiling structure according to claim 12,
The mountain portion and the valley portion extend in the fifth direction intersecting the fourth direction in a plan view.
The fourth horizontal plate has a ceiling structure that is constrained in the fourth direction. In the ceiling structure according to any one of claims 10 to 13.
A third brace fixed to the first hanging member and the first ceiling is provided.
The first hanging member has a fourth hanging bolt.
The upper part of the third brace is a ceiling structure fixed to the upper part of the fourth hanging bolt. In the ceiling structure according to claim 1,
The first ceiling has a second locking member fixed to the lower member and locked to the folded plate.
The second hanging member is fixed to the lower member and
The second locking member has a ceiling structure that is fixed to the upper member via the folded plate.

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