JP2019039157A - Ceiling structure - Google Patents

Abstract

To provide a ceiling structure capable of easily improving earthquake resisting performance in a building provided in a space under an elevated structure.SOLUTION: A ceiling structure includes an upper ceiling 2 suspended by a suspending member 1, a lower ceiling suspended by a suspending member 3 hanging from the upper ceiling 2, and a brace 6 fixed to the suspending member 3 and the lower ceiling. The upper ceiling 2 includes a folding plate 21 in which a peak portion 21a and a valley portion 21b are alternately provided, and an upper member 22 and a lower member 23 which sandwich the folding plate 21 from both upper and lower sides. The lower member 23 is fixed to the folding plate 21, the lower member 23 is formed with a through hole 23a, the suspending member 3 passes through the through hole 23a, and the upper part of the brace 6 is fixed to a part under the lower member 23 of the suspending member 3.SELECTED DRAWING: Figure 4

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, it was suspended from the slab, which is an elevated structure, that is, viaduct or bridge girder, from the viewpoint of improving comfort or securing the arrangement of piping, etc. A ceiling, that is, a suspended ceiling is 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 is leaked from the elevated structure. As a countermeasure, the ceiling structure often includes a double ceiling having an upper ceiling having a folded plate as a waterproof folded plate and a lower ceiling as a finished ceiling, that is, a decorative ceiling.

  Japanese Patent Laying-Open No. 2014-51792 (Patent Document 1) includes a roof structure in which a roof material is suspended from a frame, and includes a roof material that is attached to a roof material side member. The material side member has a support member that supports the roof material, and the support member has a bar screw that penetrates the roof material, and the bar screw can hang the decorative ceiling.

JP 2014-51792 A

  The suspended ceiling as the ceiling structure of the building provided in the space under the elevated structure was not previously subject to structural design. After that, when such a suspended ceiling fell when a major earthquake occurred, the Building Standards Act was revised in July 2013, and earthquake resistance provisions are provided for ceiling structures under certain conditions It became. However, in the seismic code established at this time, double ceilings are in principle not applicable. Therefore, it is desirable to further improve the seismic performance of the double ceiling under the railway overpass.

  In such a double ceiling, the lower ceiling is often suspended from an upper ceiling having a folded plate by a suspension member penetrating the folded plate. Further, in order to suppress the shaking of the lower ceiling during an earthquake or the like, the brace is often fixed to the suspension member and the lower ceiling. However, when the portion of the hanging member where the brace is fixed is separated downward from the portion of the hanging member that penetrates the folded plate, the portion of the hanging member that penetrates the folded plate Easily displaced in the horizontal direction. Therefore, when an earthquake occurs and a horizontal load is applied to the lower ceiling, the amount of displacement by which the lower ceiling is displaced in the horizontal direction increases, and it is difficult to easily improve the earthquake resistance of the ceiling structure.

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

  Of the inventions disclosed in the present application, the outline of typical ones will be briefly described as follows.

  The ceiling structure as one embodiment 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 suspension member suspended from the elevated structure, a first ceiling suspended by the first suspension member, a second suspension member suspended from the first ceiling, and a second suspension. A second ceiling suspended by the member; and a first brace fixed to the second suspension member and the second ceiling. The first ceiling includes 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 suspension 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 suspension member passes through the through hole or notch. And the upper part of the 1st brace is being fixed to the part below a lower member among the 2nd hanging members.

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

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

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

  As another aspect, the second suspension member may include a first suspension bolt fixed to the second ceiling, and a first connection member that connects the first suspension bolt to the upper member. . The pressing member may be a first nut screwed to the first suspension bolt. The first suspension bolt passes through the through hole or notch, the first connection member penetrates the peak portion, and the upper end portion of the first suspension bolt is fixed to the lower portion of the first connection member. The upper part may be fixed to the upper member on the peak part. The lower member may be pressed and fixed to the folded plate by the first nut. And the upper part of the 1st brace may be fixed to the part under the 1st nut among the 1st suspension bolts.

  Moreover, the said ceiling structure may be provided with the fixing member which fixes the upper part of a 1st brace to the part under a 1st nut among 1st suspension bolts as another one aspect | mode. The fixing member may be adjacent to the first nut in the first direction which is the vertical direction.

  As another aspect, the first ceiling may have a first upper angle iron and a first lower angle steel that sandwich the folded plate from both the upper and lower sides. The first upper angle steel is provided on a first horizontal plate extending in the second direction in a plan view and a first side end portion on one side in the width direction of the first horizontal plate, and the first horizontal plate A first vertical plate perpendicular to the plate. The first lower angle steel is provided below the second horizontal plate extending in the second direction in a plan view, and the second side end portion on one side in the width direction of the second horizontal plate, and the second horizontal plate And a second vertical plate perpendicular to the plate. 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 connected to the first fixing portion below the first fixing portion, and a first fixing portion that fixes the first horizontal plate by sandwiching the first horizontal plate from above and below, and You may include the 1st volt | bolt which penetrates a peak part, and the 2nd nut by which the upper part was screwed together by the 1st volt | bolt. And the lower part of the 2nd nut may be screwed together by the upper end part of the 1st suspension bolt.

  Moreover, as another aspect, the peak portion and the valley portion may extend in a third direction that intersects the second direction in plan view, and the second horizontal plate may be constrained in the second direction.

  As another aspect, the ceiling structure may include a second brace fixed to the first suspension member and the first ceiling. And the 1st suspension member may have the 2nd suspension bolt, and the upper part of the 2nd brace may be fixed to the upper part of the 2nd suspension bolt.

  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 suspension member may be fixed to the upper member on the mountain portion.

  As another aspect, the second suspension member may include a third suspension bolt fixed to the second ceiling and a second connection member that connects the third suspension bolt to the upper member. . The third suspension bolt passes through the through hole or notch, the second connection member penetrates the peak portion, the upper end portion of the third suspension bolt is fixed to the lower portion of the second connection member, and the second connection member The upper part may be fixed to the upper member on the peak part.

  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 the third horizontal plate extending in the fourth direction in a plan view, and on the third side end portion on one side in the width direction of the third horizontal plate, and the third horizontal plate And a third vertical plate perpendicular to the plate. The second lower angle steel is provided below the fourth horizontal plate extending in the fourth direction in the plan view and the fourth side end portion on one side in the width direction of the fourth horizontal plate, and the fourth horizontal plate And a fourth vertical plate perpendicular to the plate. 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 peak portion. The second connection member is provided on the mountain portion, and is provided connected to the second fixing portion below the second fixing portion, the second fixing portion fixing the third horizontal plate by sandwiching the third horizontal plate from above and below, and You may include the 2nd volt | bolt which penetrates a peak part, and the 3rd nut by which the upper part was screwed together by the 2nd volt | bolt. And the lower part of the 3rd nut may be screwed together by the upper end part of the 3rd suspension bolt.

  Moreover, as another aspect, the peak part and the valley part may extend in a fifth direction intersecting the fourth direction in plan view, and the fourth horizontal plate may be constrained in the fourth direction.

  As another aspect, the ceiling structure may include a third brace fixed to the first suspension member and the first ceiling. And the 1st suspension member may have the 4th suspension bolt, and the upper part of the 3rd brace may be fixed to the upper part of the 4th suspension bolt.

  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 embodiment of the present invention, seismic performance can be easily increased in a ceiling structure of a building provided in a space under an elevated structure.

It is sectional drawing which shows the ceiling structure of a comparative example. It is sectional drawing which shows the ceiling structure of a comparative example. 2 is a cross-sectional view showing a ceiling structure according to Embodiment 1. FIG. 2 is a cross-sectional view showing a ceiling structure according to Embodiment 1. FIG. 2 is a cross-sectional view showing a ceiling structure according to Embodiment 1. FIG. When the ceiling structure of the first embodiment and the ceiling structure of the comparative example are installed in a space under a structure that can be vibrated for testing instead of an 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 amount of displacement of the horizontal direction at the time. FIG. 6 is a cross-sectional view showing a ceiling structure according to a modification of the first embodiment. 6 is a cross-sectional view showing a ceiling structure of a second embodiment. FIG. FIG. 10 is a perspective view showing an example of a locking member included in an upper ceiling provided in the ceiling structure of the second embodiment. FIG. 10 is a perspective view showing another example of a locking member included in the upper ceiling provided in the ceiling structure of the second embodiment. FIG. 10 is a cross-sectional view showing a ceiling structure of a modification of the second embodiment.

  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 modifications while maintaining the gist of the invention are naturally included in the scope of the present invention. In addition, the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part as compared with the embodiments for the sake of clarity of explanation, but are merely examples, and the interpretation of the present invention is not limited thereto. It is not limited.

  In addition, in the present specification and each drawing, elements similar to those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description may be omitted as appropriate.

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

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

  As the ceiling structure of the building provided in the space under the elevated structure, it was suspended from the slab, which is an elevated structure, that is, viaduct or bridge girder, from the viewpoint of improving comfort or securing the arrangement of piping, etc. A ceiling, that is, a suspended ceiling is 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 is leaked from the elevated structure. As a countermeasure, the ceiling structure often includes a double ceiling having an upper ceiling having a folded plate as a waterproof folded plate and a lower ceiling being a finished ceiling. The ceiling structure of the first embodiment described below and the ceiling structure of the comparative example are also a ceiling structure provided with a double ceiling as a ceiling structure of a building provided in a space under the elevated structure.

  FIG.1 and FIG.2 is sectional drawing which shows the ceiling structure of a comparative example. 3 to 5 are sectional views showing the ceiling structure of the first embodiment. FIG. 2 is an enlarged view of a region AR101 surrounded by a two-dot chain line in the cross-sectional view shown in FIG. 4 and 5 show an enlarged area AR1 surrounded by a two-dot chain line in the cross-sectional view shown in 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. Show. In FIG. 5, illustration of the brace 6 and the fixing member 61 is omitted for easy understanding. 1 and 2 showing the ceiling structure of the comparative example, elements similar to those in FIGS. 3 to 5 showing the ceiling structure of the first embodiment are denoted by the same reference numerals, and detailed description is given. Are omitted as appropriate.

  First, of the ceiling structure of the first embodiment, the same part as the ceiling structure of the comparative example, that is, the same part of the ceiling structure of the comparative example as the ceiling structure of the first embodiment will be described.

  As shown in FIGS. 1 to 5, the ceiling structure of the first embodiment is similar to the ceiling structure of the comparative example. The hanging member 1, the upper ceiling 2, the hanging member 3, and the lower ceiling 4 , Brace 5 and brace 6. The suspension member 1 hangs down from the elevated structure 7. As the suspension member 1, for example, a suspension bolt 11 can be used. That is, the suspension member 1 has a suspension bolt 11. The upper ceiling 2 is suspended by a suspension member 1. The suspension member 3 hangs from the upper ceiling 2. The lower ceiling 4 is suspended by the suspension member 3. The brace 5 suppresses the shaking of the upper ceiling 2 such as when an earthquake occurs, and is fixed to the hanging member 1 and the upper ceiling 2. When the suspension member 1 has the suspension bolt 11, the upper portion of the brace 5 is fixed to the upper portion of the suspension bolt 11. The brace 6 suppresses the shaking of the lower ceiling 4 such as 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 railway overhead. Even in the case of being installed in the bridge, it is possible to take measures against leakage of a viaduct that is an elevated structure.

  The upper ceiling 2 includes a folded plate 21 in which peaks 21 a and valleys 21 b are alternately provided, and an upper member 22 provided on the folded plate 21. That is, the folded plate 21 has a plurality of peak portions 21a and a plurality of valley portions 21b that respectively extend in a certain direction (third direction) in plan view, and each of the plurality of peak portions 21a and a plurality of peak portions 21a. Each of the valley portions 21b is alternately arranged in a direction intersecting, preferably orthogonal to the direction in which the plurality of peak portions 21a and the plurality of valley portions 21b extend in a plan view (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 corrugated shape. Moreover, the strength of the upper ceiling 2 can be increased by using the folded plate 21 instead of a simple flat plate.

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

  Note that the ceiling structure of the first embodiment and the ceiling structure of the comparative example include braces 5 from the viewpoint of increasing the seismic performance by reducing the horizontal displacement of the lower ceiling 4 in the event of an earthquake, which will be described later. However, the brace 5 may not be provided.

  Moreover, the ceiling structure of the first embodiment is a member different from the suspension member 3 as in the ceiling structure of the comparative example, and presses and fixes the peak portion 21a of the folded plate 21 to the upper member 22. A fixing member 8 is provided.

  Next, portions of the ceiling structure of the comparative example that are 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 below the folded plate 21. The upper ceiling 2 has only the folded plate 21 and the upper member 22. Therefore, as will be described below, the seismic performance of the ceiling structure cannot be improved.

  As described above, the suspension member 3 penetrates the mountain portion 21a, and the upper portion of the suspension 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 that is an elevated structure leaks down through the through hole formed in the valley portion 21b. The waterproof performance of the folded plate 21 cannot be improved. Accordingly, since the suspension member 3 does not pass through the valley portion 21b by penetrating the mountain portion 21a, the waterproof performance of the folded plate 21 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 interference between the valley portion 21b of the folded plate 21 and the brace 6, the portion of the suspension member 3 penetrating the mountain portion 21a to which the upper portion of the brace 6 is fixed is Further, the suspension member 3 is separated downward from a portion penetrating the mountain portion 21a. Therefore, the portion of the hanging member 3 where the upper part of the brace 6 is fixed is likely to be greatly displaced in the horizontal direction with respect to the portion of the hanging member 3 that penetrates the peak portion 21a. Accordingly, 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 earthquake resistance of the ceiling structure. It 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 has a folded plate 21 and an upper member 22, A lower member 23 is provided below the folded plate 21. That is, the upper member 22 and the lower member 23 sandwich the folded plate 21 from 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 through the folded plate 21. The lower member 23 is pressed and fixed to the valley portion 21b of the folded plate 21.

  The suspension member 3 penetrates the lower member 23. Specifically, a through hole 23 a is formed in the lower member 23, and the suspension member 3 moves the lower member 23 through the through hole 23 a formed in the lower member 23. To penetrate. Further, the upper part of the brace 6 is fixed to a portion of the hanging member 3 below the lower member 23.

  Thereby, even when an earthquake occurs and a horizontal load is applied to the lower ceiling 4, the suspension member 3 is restrained in the horizontal direction within the range of the through hole 23 a formed in the lower member 23, and The lower member 23 is pressed by the folded plate 21 and restrained in the horizontal direction. Therefore, the portion of the hanging member 3 where 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 that penetrates the peak 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, thereby causing the horizontal direction of the lower member 23 (a direction in which a horizontal plate 25a described later extends (second direction)). The lower member 23 is restrained from being displaced in the horizontal direction. Therefore, the portion of the suspension member 3 to which the upper part of the brace 6 is fixed is not easily displaced in the horizontal direction. 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 can be reduced, and the earthquake resistance performance of the ceiling structure can be improved.

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

  Thereby, since the suspending member 3 is restrained substantially completely in the horizontal direction by the through-hole 23a, the portion of the suspending member 3 where the upper part of the brace 6 is fixed is compared with the suspending member 3 as compared with the comparative example. Of these, it can hardly be displaced in the horizontal direction with respect to the portion penetrating the peak 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 can be extremely reduced, and the earthquake resistance of the ceiling structure can be further enhanced. it can.

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

  Preferably, the valley 21 b 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, is valley. Since it leaks down through the through-hole formed in the part 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 any of the upper member 22 and 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, with reference to FIG. 3 thru | or FIG. 5, the suitable form of the ceiling structure of this Embodiment 1 is demonstrated.

  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. The pressing member 31 presses the lower member 23 against the folded plate 21. Accordingly, the folded plate 21 can be fixed by being sandwiched between the upper member 22 and the lower member 23 from both the upper and lower sides.

  Preferably, the suspension member 3 has a suspension bolt 32 and a connection member 33. The lower part of the suspension bolt 32 is fixed to the lower ceiling 4. The connection member 33 connects the suspension bolt 32 to the upper member 22. That is, the suspension bolt 32 is connected to the upper member 22 via the connection member 33. As the pressing member 31, for example, a nut 31 a screwed to the suspension bolt 32 can be used. The suspension bolt 32 passes through the lower member 23 by passing through a through hole 23 a formed in the lower member 23. The connecting member 33 penetrates the peak portion 21 a of the folded plate 21. The upper end portion of the suspension bolt 32 is fixed to the lower portion of the connection member 33 between the lower member 23 and the mountain portion 21a. The upper part of the connection member 33 is fixed to the upper member 22 on the peak portion 21a. The lower member 23 is pressed and fixed to the upper member 22 via the folded plate 21 by a nut 31a. The upper part of the brace 6 is fixed to a part of the suspension bolt 32 below the nut 31a. Further, in the present specification, the lower part means a part located below an 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 fixed between the upper member 22 and the lower member 23 from above and below by the nut 31a screwed to the suspension bolt 32 connected to the upper member 22 through the connecting member 33. can do. Note that the suspension bolt 32 may pass through a notch formed in the lower member 23.

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

  Consider the 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 suspension member 3 that is constrained in the horizontal direction is disposed in the through hole 21c formed in the peak portion 21a of the folded plate 21 of the suspension member 3, that is, the connection member 33. It is the part which was done. Therefore, in the comparative example, the portion of the suspension member 3, that is, the suspension bolt 32, where 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. Accordingly, 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 suspension bolt 32 where the upper part of the brace 6 is fixed increases. The seismic performance cannot be increased.

  On the other hand, in the ceiling structure of the first embodiment, the upper ceiling 2 has the lower member 23 and the suspension bolt 32 penetrates the lower member 23, so that the suspension bolt 32 penetrates the lower member 23. The portion is constrained in the horizontal direction. 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 horizontal load is applied to the lower ceiling 4, the amount of horizontal displacement of the portion of the suspension bolt 32 where the upper part of the brace 6 is fixed can be reduced. The seismic performance of the structure can be increased.

  In the present specification, the fixing member 61 is adjacent to the nut 31a in the vertical direction when the fixing member 61 contacts the nut 31a in the vertical direction, or in the vertical direction, the upper end portion of the fixing member 61. And the distance with the lower end part of the nut 31a means the case where it is below the diameter of the suspension bolt 32, for example.

  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 suspension 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 suspension bolt 32 is screwed can be used. The connecting member 63 connects the main body member 62 and the mounting bolt member 64. The attachment bolt member 64 attaches the bolt 65 to the upper part of the brace 6. A bolt 65 is provided at the end of the mounting bolt member 64 attached to the upper part of the brace 6 on the side opposite to the brace 6 side, and the bolt 65 is screwed into a screw hole 63 a 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 iron and an angle 25 as a lower angle steel sandwiching the folded plate 21 from both upper and lower sides.

  The angle 24 is orthogonal to the horizontal plate 24a extending in a certain direction (second direction) in plan view and the width direction of the horizontal plate 24a, that is, the direction (second direction) in which the horizontal plate 24a extends in plan view. 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 (second direction) in which the horizontal plate 24a extends. Further, the above-described upper member 22 is an angle 24. Such an angle 24 has a high strength against stress applied from a direction perpendicular to the extending direction of the angle 24. Therefore, the strength of the upper ceiling 2 can be increased by using the angle 24 as the upper member 22.

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

  Suitably, in the ceiling structure of the first embodiment, the connection 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 sandwiched from above and below. The bolt 33b is provided below the fixed portion 33a so as to be connected to the fixed portion 33a, and passes through the peak portion 21a by passing through a through hole 21c formed in the peak portion 21a of the folded plate 21. The upper part of the nut 33c is screwed to the bolt 33b. The lower part of the nut 33 c is screwed to the upper end part of the suspension bolt 32. At this time, the suspension bolt 32 passes through 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 connected to the upper member via the folded plate 21 by the nut 31a. 22, that is, pressed and fixed to a horizontal plate 24 a having an angle 24.

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

  The 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. Moreover, 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 from above and below. The bolt 83 b is provided below the fixing portion 83 a so as to be connected to the fixing portion 83 a and passes through the peak portion 21 a by passing through a through hole 21 c formed in the peak portion 21 a of the folded plate 21. The nut 83c is screwed to 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. By the nut 83c screwed to the bolt 83b, the peak portion 21a of the folded plate 21 can be pressed and fixed to the angle 24 that is the upper member 22.

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

  In such a case, one upper member 22 is in contact with each of the plurality of crests 21a arranged at intervals from each other via the fixing portion 33a, and one lower member 23 is spaced from each other. The folded plate 21 can be fixed by sandwiching the folded plate 21 from the upper and lower sides of the folded plate 21 with the upper member 22 and the lower member 23 in a state where the folded plate 21 is in contact with the plurality of valley portions 21b.

  In the folded plate 21, the rigidity when the side end portion on one side in the direction orthogonal to the direction in which the peak portion 21a and the valley portion 21b extend in the plan view is a fixed end is the peak portion 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, by fixing the folded plate 21 with the upper member 22 and the lower member 23 extending from the upper and lower sides of the folded plate 21 in the direction orthogonal to the direction in which the peak portion 21a and the valley portion 21b extend, respectively. In addition, the rigidity of the entire upper ceiling 2 can be increased when the side end portion on one side in the direction orthogonal to the direction in which the peak portion 21a and the valley portion 21b extend is a fixed end in plan view.

  As described above, the ceiling structure of the first embodiment may or may not include the braces 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 earthquake resistance as compared with the ceiling structure of the comparative example.

  However, when the ceiling structure of the first embodiment includes the braces 5, an earthquake occurs and the lower ceiling 4 has a horizontal direction compared to the case where the ceiling structure of the first embodiment does not include the braces 5. When a load is applied, 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 enhanced. The suspension member 1 is preferably a suspension bolt 11, and the upper portion of the brace 5 is preferably fixed to the upper portion of the suspension bolt 11.

  In the ceiling structure according to the first embodiment, the lower ceiling 4 may include a ceiling plate material 41, a field edge 42, and a field edge receiver 43. The field edge 42 is provided on the ceiling board material 41 and extends in a certain direction in plan view. The field edge receiver 43 is provided on the field edge 42 and extends in a direction intersecting with, preferably orthogonal to, the direction in which the field edge 42 extends in a plan view. In such a case, the lower part 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 a space under a structure that can be vibrated for testing instead of an actual elevated structure. It is a graph which shows an example of the load dependence of the amount of displacement of the horizontal direction when changing a load.

  Consider the 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 a space under a structure that can be vibrated for testing. .

  For example, the distance (distance DS1 in FIGS. 1 and 3) 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 is 1500 mm, and the lower ceiling is formed from the upper surface of the folded plate 21. The distance to the lower surface of 4 (distance DS2 in FIGS. 1 and 3) is 500 mm. The distance between the centers of the two suspension bolts 11 adjacent to each other in the extending direction of the upper member 22, that is, the angle 24 (see FIG. 4) (distance DS 3 in FIGS. 1 and 3) is 900 mm. The distance between the centers of the two suspension 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. 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 peak portion relative to the portion is 85 mm.

  Regarding the two ceiling structures having such a shape, the load dependency of the horizontal displacement of the lower ceiling when the load is applied to the structure in the horizontal direction and the load applied in the horizontal direction is changed. Measuring. At this time, as shown in FIG. 6, when the horizontal displacement in the ceiling structure of the comparative example is 100%, the horizontal displacement in the ceiling structure of the first embodiment is reduced to 71%. Yes. Therefore, the ceiling structure according to the first embodiment can reduce the amount of displacement of the lower ceiling in the horizontal direction when an earthquake occurs and a horizontal load is applied to the lower ceiling. It has become clear that the seismic performance can be improved.

<Modification 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 the nut 31a screwed to the suspension bolt 32 has been described. However, the pressing member 31 may not be a nut screwed to the suspension 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, the pressing member 31 is not screwed to the suspension bolt 32 and is screwed to a bolt different from the suspension bolt 32. An example will be described.

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

  As shown in FIG. 7, the ceiling structure of the present modification includes a fixing member 9 that is a member different from the suspension member 3 and that fixes the folded plate 21.

  The fixing member 9 includes a bolt 91 and a connection member 92. The connection member 92 connects the bolt 91 to the upper member 22. The pressing member 31 is a nut 93 that is screwed into the bolt 91. The bolt 91 passes through the lower member 23 by passing through a through hole 23 a formed in the lower member 23. The connecting member 92 passes through the peak portion 21 a by passing through the through hole 21 c formed in the peak portion 21 a of the folded plate 21. The upper end portion of the bolt 91 is fixed to the lower portion of the connection member 92 between the lower member 23 and the peak portion 21a. The upper part of the connection member 92 is fixed to the upper member 22 on the peak portion 21a. The lower member 23 is pressed and fixed to the upper member 22 via the folded plate 21 by a nut 93. 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 to the bolt 91 connected to the upper member 22 via the connecting member 92. be able to.

  The lower member 23 may be formed with a notch having a U shape in 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 connection member 92 includes a fixing portion 92a, a bolt 92b, and a nut 92c. The fixing portion 92a is provided on the peak portion 21a of the folded plate 21, and fixes the horizontal plate 24a sandwiched from above and below. The bolt 92 b is provided below the fixed portion 92 a and penetrates the peak portion 21 a of the folded plate 21. The nut 92c is screwed to 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 crest portion 21a of the folded plate 21 can be pressed and fixed to the angle 24 that is the upper member 22 by the nut 92c screwed into the bolt 92b.

  Also in this modified example, as in the first embodiment, the portion of the hanging member 3 where the upper portion of the brace 6 is fixed is the portion of the hanging member 3 that penetrates the peak portion 21a as compared to the comparative example. On the other hand, it becomes difficult to displace horizontally. 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 can be reduced, and the seismic performance of the ceiling structure can be enhanced.

  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 that fixes the upper portion of the brace 6 to the portion below the lower member 23 of the suspension bolt 32 is adjacent to the horizontal plate 25a of the angle 25 that 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 that 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. Similarly to the ceiling structure of the first embodiment, the ceiling structure of the second embodiment is also a building ceiling structure provided in a space under the elevated structure.

  Of 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. The description is omitted. That is, the ceiling structure of the second embodiment is also similar to the ceiling structure of the first embodiment. The suspension member 1, the upper ceiling 2, the suspension member 3, the lower ceiling 4, the brace 5, and the brace 6, but the description of portions 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 is omitted. The brace 5 suppresses the shaking of the upper ceiling 2 such as when an earthquake occurs, and is fixed to the hanging member 1 and the upper ceiling 2. When the suspension member 1 has the suspension bolt 11, the upper portion of the brace 5 is fixed to the upper portion of the suspension bolt 11.

  FIG. 8 is a cross-sectional view showing the ceiling structure of the second embodiment. FIG. 8 shows, in an enlarged manner, the region corresponding to the region AR1 surrounded by the two-dot chain 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 illustrating 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 a locking member included in an upper ceiling provided in the ceiling structure of the second embodiment. 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 in the same manner as the upper ceiling 2 provided in the ceiling structure of the first embodiment shown in FIG. 4. And an upper member 22. Regarding the folded plate 21 and the upper member 22 included in the upper ceiling 2 provided in the ceiling structure according to the second embodiment, the folded plate 21 and the upper member included in the upper ceiling 2 provided in the ceiling structure according to the second embodiment. 22 and the description thereof is omitted.

  Similarly 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 provided below the folded plate 21 in addition to the folded plate 21 and the upper member 22. The lower member 23 is provided. That is, the upper member 22 and the lower member 23 sandwich the folded plate 21 from 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 through the folded plate 21.

  On the other hand, in the ceiling structure according to the second embodiment, unlike the ceiling structure according to 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 peak portion 21 a 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 inclined surface portions 27d. The main body 27a has a trapezoidal shape having a lower base, an upper base shorter than the lower base, and two oblique sides arranged on 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 each of the two oblique sides of the main body portion 27a has two inclined surface portions. 27d are connected to each other. That is, the face door 27 has a trapezoidal shape that can close the gap between the peak portion 21 a of the folded plate 21 and the lower member 23.

  Also in the second embodiment, the suspension member 3 penetrates the lower member 23 as in the first embodiment. Specifically, a through hole 23 a is formed in the lower member 23, and the suspension member 3 moves the lower member 23 through the through hole 23 a formed in the lower member 23. To penetrate. Further, the upper part of the brace 6 is fixed to a portion of the hanging member 3 below the lower member 23.

  Also in the second embodiment, similarly to the first embodiment, the valley portion 21b of the folded plate 21 is preferably 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 suspension member 3 preferably includes a suspension bolt 32 and a connection member 33. The lower part of the suspension bolt 32 is fixed to the lower ceiling 4 (see FIG. 3). The connection member 33 connects the suspension bolt 32 to the upper member 22. That is, the suspension bolt 32 is connected to the upper member 22 via the connection member 33. The suspension bolt 32 penetrates the lower member 23. The connecting member 33 penetrates the peak portion 21 a of the folded plate 21. The upper end portion of the suspension bolt 32 is fixed to the lower portion of the connection member 33 between the lower member 23 and the mountain portion 21a. The upper part of the connection member 33 is fixed to the upper member 22 on the peak portion 21a. The upper part of the brace 6 is fixed to a part of the suspension 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 to the suspension bolt 32 can be used. Further, in the second embodiment, unlike the first embodiment, the folded plate 21 is not fixed between the upper and lower members 22 and 23 from the upper and lower sides by the nut 31a screwed to the suspension bolt 32. May be. In the second embodiment, it is only necessary to adjust the height position of the lower member 23 by supporting the lower member 23 by the nut 31a, and the folded plate is supported by the lower member 23 supported by the nut 31a. 21 may not be pressed.

  Similarly to the ceiling structure of the first embodiment, the ceiling structure of the second embodiment preferably includes a fixing member 61 that fixes the upper portion of the brace 6 to a portion of the suspension bolt 32 below the nut 31a. Yes. The fixing member 61 is adjacent to the nut 31a in the vertical direction. Also in the second embodiment, as in the first embodiment, the fixing member 61 includes 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, the upper ceiling 2 preferably includes an angle 24 as an upper angle iron and an angle as a lower angle steel sandwiching the folded plate 21 from both upper and lower sides. 25.

  The angle 24 is orthogonal to the horizontal plate 24a extending in a certain direction (fourth direction) in plan view and the width direction of the horizontal plate 24a, that is, the direction (fourth direction) in which the horizontal plate 24a extends in plan view. 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 (the fourth direction) in which the horizontal plate 24a extends. Further, the above-described upper member 22 is an angle 24. Such an angle 24 has a high strength against stress applied from a direction perpendicular to the extending direction of the angle 24. Therefore, the strength of the upper ceiling 2 can be increased by using the angle 24 as the upper member 22.

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

  Also in the second embodiment, similarly to the first embodiment, the connection 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 sandwiched from above and below. The bolt 33b is provided below the fixed portion 33a so as to be connected to the fixed portion 33a, and passes through the peak portion 21a by passing through a through hole 21c formed in the peak portion 21a of the folded plate 21. That is, the connection member 33, in other words, the suspension member 3 penetrates the peak portion 21a. The upper part of the nut 33c is screwed to the bolt 33b. The lower part of the nut 33 c is screwed to the upper end part of the suspension bolt 32. At this time, the suspension bolt 32 passes through 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 folded by the nut 31a to the folded plate 21. The upper member 22, that is, the horizontal plate 24 a of the angle 24 is pressed and fixed via the. Thereby, the suspension bolt 32 can be fixed to the angle 24 via the nut 33c, the bolt 33b, and the fixing portion 33a.

  The horizontal plate 25a as the lower member 23 may be formed with a notch having a U shape in plan view instead of the through hole 23a. The suspension member 3 passes through the notch. Also good.

  The 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 part of the suspension member 3 is fixed to the upper member 22 on the mountain portion 21a. Moreover, 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 the locking member 26. As shown in FIGS. 8 and 9, as the locking member 26, a face door 27 that closes a gap between the peak portion 21 a of the folded plate 21 and the horizontal plate 25 a as the lower member 23 can be used. As described above, the face door 27 includes the main body portion 27a, the lower bottom surface portion 27b, the upper bottom surface portion 27c, and the two inclined surface portions 27d. The face door 27 has a shape that can be fitted into the gap between the peak portion 21 a of the folded plate 21 and the lower member 23, and the gap between the peak portion 21 a of the folded plate 21 and the lower member 23. The gap between the crest portion 21a of the folded plate 21 and the lower member 23 can be closed by being fitted to.

  Further, unlike the ceiling structure of the first embodiment, the ceiling structure of the second embodiment includes a fixing member 28 that fixes the locking member 26 to the horizontal plate 25 a of the lower member 23. The fixing member 28 includes a bolt 28a, a nut 28b, and a nut 28c. The bolt 28 a passes through a through hole 23 a formed in the lower member 23 through a notch 27 e having a U shape in plan view, which is formed in the lower bottom surface portion 27 b of the face door 27 as the locking member 26. This penetrates the lower member 23. The lower bottom surface portion 27b of the face door 27 and the lower member 23 can be fixed by being sandwiched from both the upper and lower sides by nuts 28b and nuts 28c screwed to the bolts 28a. In addition, it replaces with a face door as the locking member 26, and the tight frame in which the peak part and the trough part were provided alternately is used, and the tight frame and the lower member 23 are sandwiched from both the upper and lower sides as the fixing member 28. A fixing member to be fixed can also be used.

  The suspension member 3 passes through a through hole 23 a formed in the lower member 23, the lower member 23 is fixed to the locking member 26, and the locking member 26 is restrained in the horizontal direction by the folded plate 21. . Thereby, even when an earthquake occurs and a horizontal load is applied to the lower ceiling 4, the suspension member 3 is restrained in the horizontal direction within the range of the through hole 23 a formed in the lower member 23, and The lower member 23 is locked by a 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 part of the brace 6 is fixed is different from the comparative example in that the mountain portion 21a is included in the hanging member 3. It becomes difficult to be displaced 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 regulating force that regulates the displacement of the locking member 26 acts between the locking member 26 and the folded plate 21, thereby The positional deviation in the horizontal direction (the direction in which the horizontal plate 25a extends (the fourth direction)) is restricted. Therefore, the portion of the suspension member 3 to which the upper part of the brace 6 is fixed is not easily displaced in the horizontal direction. 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 can be reduced, and the earthquake resistance performance of the ceiling structure can be improved.

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

  Although not shown in FIG. 8, a face door 29 as the locking member 26 shown in FIG. 10 may be arranged between the mountain portion 21 a in the vicinity of the connection 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 deleted so as not to interfere with the nut 33 c of the connection member 33.

  The ceiling structure of the second embodiment is a member different from the suspension member 3 as in the ceiling structure of the first embodiment, and presses the peak portion 21a of the folded plate 21 against the upper member 22. A fixing member 8 to be fixed may be provided. The fixing member 8 includes 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 from above and below. The bolt 83 b is provided below the fixing portion 83 a so as to be connected to the fixing portion 83 a and passes through the peak portion 21 a by passing through a through hole 21 c formed in the peak portion 21 a of the folded plate 21. The bolt 83 b passes through a notch 27 f formed in the upper bottom surface portion 27 c of the face door 27 that is the locking member 26. The nut 83c is screwed to 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 to the bolt 83b, the upper bottom surface portion 27c of the face door 27 can be pressed and fixed to the angle 24 that is the upper member 22 through the mountain portion 21a of the folded plate 21.

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

<Modification of ceiling structure>
In the ceiling structure of the second embodiment, the suspension bolt 32 is connected to the upper member 22 via the connection member 33. However, the suspension bolt 32 may not be connected to the upper member 22. In the following, an example in which the suspension 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 suspension member 3 is fixed to the lower member 23 will be described. This will be described as a modification of the second embodiment.

  FIG. 11 is a cross-sectional view showing a ceiling structure according to a modification of the second embodiment. 11 shows a cross section perpendicular to the same direction as the cross section shown in FIG. 8. Like the cross section shown in FIG. 8, the alternate long and two short dashes line in the cross sectional view shown in FIG. A region corresponding to the region AR1 surrounded by is enlarged.

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

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

  Also in this modified example, the upper ceiling 2 has a locking member 26 fixed to the lower member 23 and locked to the folded plate 21 as in the second embodiment. The locking member 26 is fixed to the upper member 22 via the folded plate 21. On the other hand, in the present modification, unlike the second embodiment, the hanging member 3 is fixed to the lower member 23. Note that the ceiling structure of this modification also includes a fixing member 28 that fixes the locking member 26 to the horizontal plate 25a of the lower member 23 and a peak portion 21a of the folded plate 21 in the same manner as the ceiling structure of the second embodiment. And a fixing member 8 that is pressed against and fixed to the upper member 22.

  Also in this modified example, the suspension member 3 is restrained in the horizontal direction within the range of the through hole 23a formed in the lower member 23 as in the second embodiment. Compared with the comparative example, the portion to which the upper portion is fixed is less likely to be displaced in the horizontal direction with respect to the portion of the suspension member 3 that penetrates the peak 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 can be reduced, and the seismic performance of the ceiling structure can be enhanced.

  In addition, although illustration is abbreviate | omitted in FIG. 11, even if the through-hole 23a or a notch is not formed in the horizontal board 25a, and the suspending member 3 has a connection member similar to the connection member 33 (refer FIG. 8). Well, the connection 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 you can. Further, a 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 a fixing portion similar to the fixing portion 33a and a bolt similar to the bolt 33b, a sheet A sheet stat similar to the stat 33d (see FIG. 8) may be used.

  In such a case, the suspension member 3 does not penetrate the peak portion 21a of the folded plate 21, and the upper portion of the suspension member 3 is not fixed to the upper member 22 on the peak portion 21a. However, since the suspension member 3 is fixed to the lower member 23, the suspension 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 horizontal load 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 earthquake resistance performance of the ceiling structure can be improved.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the invention is not limited to the embodiment, and various modifications can be made without departing from the scope of the invention. Needless to say.

  In the scope of the idea of the present invention, those skilled in the art can conceive various changes and modifications, and it is understood that these changes and modifications also belong to the scope of the present invention.

  For example, those in which the person skilled in the art appropriately added, deleted, or changed the design of the above-described embodiments, or those in which the process was added, omitted, or changed the conditions are also included in the present invention. As long as the gist is provided, it is included in the scope of the present invention.

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

1, 3 Hanging member 2 Upper ceiling 4 Lower ceiling 5, 6 Brace 7 Elevated structure 8, 9, 28, 61 Fixing member 11, 32 Hanging bolt 21 Folding plate 21a Mountain portion 21b Valley portion 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 portion 27b Lower bottom surface portion 27c Upper bottom surface portion 27d Slope portion 27e, 27f Notch 28a, 33b, 65, 83b, 91, 92b Bolt 28b, 28c, 31a, 31c, 33c, 83c, 92c, 93 Nut 31 Press member 31b Support member 33, 92 Connection member 33a, 83a, 92a Fixing portion 33d , 83d, 92d Seat stat 41 Ceiling plate material 42 Field edge 43 Field edge receiver 62 Body member 62a High nut 3 the coupling member 63a threaded hole 64 mounting bolt AR1 region DS1~DS4 distance

Claims (15)

In the ceiling structure of the building provided in the space under the elevated structure,
A first suspension member hanging from the elevated structure;
A first ceiling suspended by the first suspension member;
A second suspension member hanging from the first ceiling;
A second ceiling suspended by the second suspension member;
A first brace fixed to the second suspension member and the second ceiling;
With
The first ceiling is
A folded plate in which peaks and valleys are provided alternately;
An upper member and a lower member sandwiching the folded plate from above and below,
Have
The upper member is suspended by the first suspension member;
The folded plate is fixed to the upper member;
The lower member is fixed to the folded plate,
The lower member is formed with a through hole or notch,
The second suspension member passes through the through hole or the notch,
The upper part of the first brace is a ceiling structure fixed to a portion below the lower member of the second hanging member. The ceiling structure according to claim 1,
The lower member is pressed and fixed to the folded plate,
The second suspension member penetrates the mountain portion,
The upper part of the second suspension member is a ceiling structure fixed to the upper member on the mountain portion. The ceiling structure according to claim 2,
The trough 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 comprising a pressing member that presses the lower member against the folded plate. The ceiling structure according to claim 4,
The second suspension member is
A first suspension bolt fixed to the second ceiling;
A first connection member connecting the first suspension bolt to the upper member;
Have
The pressing member is a first nut screwed into the first suspension bolt;
The first suspension bolt passes through the through hole or the notch,
The first connection member penetrates the peak portion,
An upper end portion of the first suspension bolt is fixed to a lower portion of the first connection 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 part of the first brace is a ceiling structure that is fixed to a portion of the first suspension bolt below the first nut. In the ceiling structure according to claim 5,
A fixing member for fixing an upper portion of the first brace to a portion of the first suspension bolt below the first nut;
The fixing member is a ceiling structure adjacent to the first nut in a first direction which is a vertical direction. In the ceiling structure according to claim 5 or 6,
The first ceiling has a first upper angle iron and a first lower angle steel sandwiching 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 plan view;
A first vertical plate provided on a first side end portion on one side in the width direction of the first horizontal plate and perpendicular to the first horizontal plate;
Including
The first lower angle steel is
A second horizontal plate extending in the second direction in plan view;
A second vertical plate provided below a second side end portion on one side in the width direction of the second horizontal plate and perpendicular to the second horizontal plate;
Including
The first upper angle steel is the upper member,
The second horizontal plate is the lower member;
The first connecting member is
A first fixing portion that is provided on the mountain portion and fixes the first horizontal plate sandwiched from above and below;
A first bolt that is connected to the first fixing portion and is provided below the first fixing portion and penetrates the peak portion;
A second nut whose upper part is screwed to the first bolt;
Including
A ceiling structure in which a lower portion of the second nut is screwed to an upper end portion of the first suspension bolt. The ceiling structure according to claim 7,
The peak portion and the valley portion extend in a third direction intersecting the second direction in plan view,
The second horizontal plate is a ceiling structure constrained in the second direction. In the ceiling structure as described in any one of Claims 2 thru | or 8,
A second brace fixed to the first suspension member and the first ceiling;
The first suspension member has a second suspension bolt,
The upper part of the second brace is a ceiling structure fixed to the upper part of the second suspension bolt. 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 suspension member penetrates the mountain portion,
The upper part of the second suspension member is a ceiling structure fixed to the upper member on the mountain portion. The ceiling structure according to claim 10,
The second suspension member is
A third suspension bolt fixed to the second ceiling;
A second connecting member for connecting the third suspension bolt to the upper member;
Have
The third suspension bolt passes through the through hole or the notch,
The second connecting member penetrates the peak portion,
An upper end portion of the third suspension bolt is fixed to a lower portion of the second connection member,
The upper part of the second connection member is a ceiling structure fixed to the upper member on the mountain portion. The ceiling structure according to claim 11,
The first ceiling has a second upper angle steel and a second lower angle steel sandwiching 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 plan view;
A third vertical plate provided on a third side end portion on one side in the width direction of the third horizontal plate and perpendicular to the third horizontal plate;
Including
The second lower angle steel is
A fourth horizontal plate extending in the fourth direction in plan view;
A fourth vertical plate provided below a fourth side end portion on one side in the width direction of the fourth horizontal plate and perpendicular to the fourth horizontal plate;
Including
The second upper angle steel is the upper member,
The fourth horizontal plate is the lower member;
The first locking member is a face door that closes a gap between the fourth horizontal plate and the peak portion,
The second connecting member is
A second fixing portion provided on the mountain portion and fixing the third horizontal plate from above and below;
A second bolt that is connected to the second fixing portion and is provided below the second fixing portion and penetrates the peak portion;
A third nut whose upper part is screwed to the second bolt;
Including
A ceiling structure in which a lower portion of the third nut is screwed to an upper end portion of the third suspension bolt. The ceiling structure according to claim 12,
The peak portion and the valley portion extend in a fifth direction intersecting the fourth direction in plan view,
The fourth horizontal plate is a ceiling structure that is constrained in the fourth direction. The ceiling structure according to any one of claims 10 to 13,
A third brace fixed to the first suspension member and the first ceiling;
The first suspension member has a fourth suspension bolt,
The upper part of the third brace is a ceiling structure fixed to the upper part of the fourth suspension bolt. 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 suspension member is fixed to the lower member;
The ceiling structure, wherein the second locking member is fixed to the upper member via the folded plate.

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