JP7257844B2 - Seismic ceiling structure - Google Patents

Description

The present invention relates to an earthquake resistant ceiling structure.

2. Description of the Related Art Conventionally, suspended ceilings have been widely used as ceilings of buildings such as schools, hospitals, production facilities, gymnasiums, swimming pools, airport terminal buildings, office buildings, theaters, and cinema complexes. Such a suspended ceiling includes a plurality of ceiling joists arranged side by side with a predetermined interval in one horizontal direction, and a plurality of ceiling joists perpendicular to the ceiling joists and arranged side by side with a predetermined interval in the other horizontal direction. Multiple joist receiving materials are integrally connected to the joists, the lower end is connected to the joist receiving material, and the upper end is fixed to the upper structure (building frame) such as the floor materials of the upper floors. and a ceiling panel that is integrally attached to the lower surface of the ceiling joist with screws or the like to form the ceiling surface of the lower floor.

On the other hand, the suspended ceiling, in which the ceiling base of the joists and the ceiling joist receiving members and the ceiling panel are suspended and supported by suspension members, is subject to horizontal acceleration during an earthquake and causes lateral vibration. Since the ceiling panel behaves structurally separately from the building frame and tends to amplify rolling, there is a risk that the ceiling panel will collide with the building frame, such as walls, pillars, and beams, and be damaged and fall off. rice field.

In order to prevent such a suspended ceiling from falling off, it is known to install diagonal members as earthquake-resistant members or to place walls, etc. that bear the seismic force around the ceiling as described in Notification No. 791 of the Ministry of Land, Infrastructure, Transport and Tourism. It is
As another example, for example, as shown in Patent Document 1, a substantially bar-shaped tension member is provided below the ceiling panel and in the lateral direction along the ceiling panel, and this tension member is attached to both ends of the building. The ceiling panel and the building frame are connected by connecting and arranging to the building frame, and by connecting and fixing the intermediate portion between both ends to the ceiling panel and/or the ceiling panel and/or the ceiling panel from below the ceiling panel and/or the ceiling panel by connecting and fixing means. There are also known earthquake-resistant ceiling structures in which the ceiling panels have improved earthquake-resistant performance, and straight ceilings in which the ceiling is directly attached to a trellis composed of columns and beams, although they are not suspended ceilings.

JP 2013-177801 A

Suspended ceilings using board-based ceiling materials such as gypsum board and silica gel behave integrally as a rigid floor against acceleration in the in-plane direction of the ceiling panels because the in-plane rigidity of the ceiling panels is high. For this reason, it is possible to make the ceiling earthquake-resistant by installing diagonal members as earthquake-resistant members or by placing walls, etc. that bear the seismic force around the ceiling as described in Ministry of Land, Infrastructure, Transport and Tourism Notification No. 791. , Board-based ceiling materials such as gypsum board and silica glass have the property of lowering the base material strength due to moisture absorption. Ceiling finishing materials such as panels, spandrels, and bus ribs made of materials such as metal that do not change are often used.

In addition, even in the case of a structure such as Patent Document 1, in which tension members are placed on the lower surface of the ceiling panel to provide earthquake resistance, the structure of the earthquake-resistant ceiling is based on the in-plane rigidity of the board-type ceiling panel. It has the characteristic that the base material yield strength decreases due to moisture absorption.

Furthermore, since ceiling finishing materials such as panels, spandrels, and bus ribs made of materials such as metal lack in-plane rigidity, it is necessary to improve the cross-sectional performance of the ceiling base material for earthquake-resistant design. In other words, the ceiling base material is planned to be a grape trellis, but the steel trellis composed of posts, beams, diagonal members, etc. has problems such as high cost and increased load, and there is room for improvement in that respect. rice field.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a low-cost, lightweight earthquake-resistant ceiling structure for ceilings using ceiling panels with poor in-plane rigidity.

In order to achieve the above objects, an earthquake-resistant ceiling structure according to the present invention includes: a suspended ceiling unit that is suspended and supported by an upper structure of a building frame via a suspension member; a tension unit that bears the horizontal load of the unit, the tension unit comprising: tension members arranged extending in the horizontal and vertical directions; and first braces that constrain ends of the tension members to the building frame. and a tension member connecting plate that connects the tension members to each other at the intersection of the tension members arranged to extend in the horizontal and vertical directions, and the intersection of the tension members extending in the vertical and horizontal directions is a horizontal force It is characterized in that it can be set arbitrarily without installing a separate brace in the ceiling space between fixed spans as a constraint point for.

In the earthquake-resistant ceiling structure according to the present invention, the tension member that is joined to the upper part of the suspended ceiling unit is arranged so as to extend in the horizontal direction, and the tension member is attached to the upper structure via the first brace that restrains the end of the tension member. By joining the suspended ceiling unit to the building frame, the suspended ceiling unit behaves in the horizontal direction integrally with the building frame, and it is possible to suppress the amplification of the shaking of the suspended ceiling unit.
That is, in the earthquake-resistant ceiling structure according to the present invention, the horizontal inertial force of the ceiling that acts during an earthquake can be reliably transmitted to the building frame, and the ceiling can be attached to the building frame such as walls, pillars, and beams as in the past. It is possible to realize a ceiling structure with high load-bearing rigidity that prevents collisions.

In addition, in the present invention, both the tension unit and the suspended ceiling unit have a structure in which the vertical support is borne by the suspension members arranged in a short span, so the vertical bending load can be set small, and the horizontal load borne by the tension unit is large. can be efficiently propagated by the tensile force of the metal.
In the present invention, the distance between the restraint points against the horizontal force, which is the joint with the tension unit, can be set arbitrarily. The bending load is reduced, and it is possible to design an earthquake-resistant ceiling that uses low-cost, lightweight shaped steel for the suspended ceiling unit, including the earthquake-resistant members.

In addition, in the present invention, the braces are basically placed at the ends of the ceiling, so it is possible to increase the degree of freedom in the layout of the equipment in the ceiling space between fixed spans, and it is possible to flexibly respond to equipment repairs. A seismic ceiling can be realized.

Further, the earthquake-resistant ceiling structure according to the present invention may be characterized in that a second brace serving as intermediate stiffening is provided at an intermediate portion of the tensile member in the longitudinal direction.

In this case, it is possible to configure the tension member with a larger span by installing a second brace that serves as intermediate stiffening at the intermediate portion of the tension member.

Further, in the earthquake-resistant ceiling structure according to the present invention, the suspended ceiling unit has a ceiling base material and a ceiling plate, is vertically supported from the upper structure via the suspension member, and is supported by the tension unit. It may be supported in the horizontal direction by tightening with restraint points against horizontal forces.

Further, in the earthquake-resistant ceiling structure according to the present invention , the suspended ceiling unit includes a base material joining member that is joined to the tension unit, and the tension member is connected to the suspended ceiling unit via the tension member connecting plate. On the other hand, it may be joined to the base material joining member arranged so as to pass through the intersection of the member in the horizontal vertical direction and the member in the horizontal horizontal direction.

According to the earthquake-resistant ceiling structure of the present invention, it is possible to realize an earthquake-resistant ceiling structure with high load-bearing rigidity and a low-cost, lightweight ceiling structure with high load-bearing rigidity in a ceiling using a ceiling finishing material with poor in-plane rigidity. I can provide the ceiling.

1 is a perspective view of a seismic ceiling structure according to an embodiment of the present invention, with a suspended ceiling unit and a tension unit exploded; FIG. It is the side view which looked at the earthquake-resistant ceiling structure from the 2nd horizontal direction. FIG. 4 is a plan view of a state in which the ends of the tension member are connected to the tension member connecting plate, as seen from below; FIG. 4 is a side view of the tensile member connecting plate taken along the line AA shown in FIG. 3; FIG. 10 is a front view of an end brace of the tensioning unit; FIG. 6 is a view taken along the line BB shown in FIG. 5 and is a side view of the end brace; Fig. 10 is a front view of an intermediate brace of the tensioning unit; FIG. 8 is a view taken along line CC shown in FIG. 7 and is a side view of the end brace;

Hereinafter, an earthquake-resistant ceiling structure according to an embodiment of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, the earthquake-resistant ceiling structure 1 according to the present embodiment is used in buildings such as outdoor eaves, indoor swimming pools, and hot bath facilities in a humid environment. It can be applied to ceilings using ceiling finishing materials such as panels, spandrels, and bus ribs using materials, and can be applied not only to new buildings but also to renovation work to make existing buildings earthquake resistant.

The earthquake-resistant ceiling structure 1 is joined to the suspended ceiling unit 2 suspended from the upper structure 11 (see FIG. 2) of the building frame via the suspension member 4 (see FIG. 2), and the upper part of the suspended ceiling unit 2, a tensioning unit 3 for transmitting to the superstructure 11 the horizontal inertial forces of the ceiling that occur during an earthquake.
In this embodiment, the tension units 3 are arranged in a rectangular area that is elongated in one direction in plan view. The longitudinal direction is defined as a first horizontal direction X1, and the lateral direction is defined as a second horizontal direction X2.

The suspended ceiling unit 2 consists of a hanging member 4 and a joist receiving member 21 that is suspended and supported by the upper structure 11 via the hanging member 4, and a joist receiving member 21 attached to the upper surface of the joist receiving member 21 and joined to the tension unit 3. It is provided with a hem receiving orthogonal member 30 (base material joining member), a joist 22 attached to the lower surface of the joist receiving member 21, and a ceiling panel 23 (ceiling plate) attached to the lower surface of the joist 22. . A lower surface of the ceiling panel 23 forms a ceiling surface. Here, the hanging member 4, the joist receiving member 21, the joist 22, the joist receiving orthogonal member 30, and the joint metal fittings thereof constitute the ceiling substrate material.
That is, the suspended ceiling unit 2 is vertically supported by the upper structure 11 via the suspension member 4, and is horizontally suspended by being tightly connected to the tension member connecting plate 33 installed at the restraint point against the horizontal force of the tension unit 3. It is a configuration supported by

The joist receiving material 21 is, for example, a square steel pipe of 40×20×1.6, and extends horizontally along the first horizontal direction X1 and parallel to the second horizontal direction X2 with a predetermined interval. are installed in multiple places. The joist receiving material 21 is arranged so as to intersect with the joists 22 and is arranged in a state of supporting the plurality of joists 22 from above. The joist receiving member 21 is connected to the joist 22 by using an earthquake-resistant clip 38 (see FIG. 2), which is a joist connecting fitting, at a portion intersecting the joist 22 .

The joist 22 is, for example, a thin plate steel specified in JIS A 6517, horizontally extended along the second horizontal direction X2, and arranged in parallel with a predetermined interval in the first horizontal direction X1. It is

As shown in FIG. 2, the suspending member 4 is a suspending bolt which is formed in the shape of a cylindrical bar and has a male thread on its outer peripheral surface. The lower end side is connected to the joist receiving member 21 by using the earthquake-resistant hanger 41 which is a metal fitting for connecting the hanging member. Moreover, the plurality of hanging members 4 are arranged at a pitch of, for example, 1 m with respect to the ceiling joist receiving member 21 . The suspended ceiling unit 2 is configured so that the long-term load and the vertical inertial force during an earthquake are supported from the building frame by the suspension members 4 .

The ceiling panel 23 is made of, for example, an aluminum spandrel or the like having poor in-plane rigidity, and is formed with a weight of, for example, 25 kg or less per 1 m ² together with the weight of the ceiling accessory equipment. The ceiling panel 23 is installed on the lower surfaces of the plurality of ceiling joists 22 by screwing or the like. In addition, the ceiling panel 23 may be composed of a ceiling finishing material having poor in-plane rigidity of the ceiling surface such as a spandrel other than an aluminum spandrel, a panel, or a bus rib. It may be composed of a board-based ceiling panel.

As shown in FIGS. 1 and 2, the tension unit 3 is a joint member at the intersection of the tension members 31 arranged to extend in the first horizontal direction X1 and the second horizontal direction X2 and the tension members 31 in the vertical and horizontal directions. A tension member connecting plate 33 and braces 32 (32A, 32B) joined to the ends (outer ends 31b) of the tension members 31 and having upper ends fixed to the upper structure 11 are provided.

Also, the tension unit 3 is joined to the suspended ceiling unit 2 via the tension member connecting plate 33 . The tension member connecting plate 33 and the joist receiver orthogonal member 30 fixed by bolts or the like extend along the second horizontal direction X2 orthogonal to the joist receiver member 21 when viewed from above.

The lower surface of the tensile member 31 is arranged at approximately the same level (height) as the upper surface of the suspended ceiling unit 2, and for example, an aluminum extruded profile, a rectangular pipe, a lightweight structural steel, or the like can be used. 3 and 4 employ flat steel pipes. The tension member 31 is a member for propagating the horizontal inertial force acting on the suspended ceiling unit 2 during an earthquake to the upper structure 11 of the building frame, which is a support structure effective for bearing strength and rigidity. That is, the tension member 31 is joined to the joist receiving orthogonal member 30 of the suspended ceiling unit 2 via a tension member connection plate 33 installed at the intersection of the horizontal vertical member and the horizontal horizontal member.

The tension member 31 includes a plurality of (three in FIG. 1) first tension members 31A extending in the first horizontal direction X1 and a plurality of (eight in FIG. 1) second tension members 31B extending in the second horizontal direction X2. , are arranged vertically and horizontally in the same horizontal plane. Here, as shown in FIGS. 3 and 4, the first tension member 31A and the second tension member 31B are joined by a tension member connecting plate 33 at their respective intersections. As shown in FIG. 1, the tension member 31 has an outer end portion 31b located on the outer periphery of the tension member 31 constituting the tension unit 3 in top view, and is positioned outside the intersection point (the tension member connecting plate 33). ing.

The tension member connecting plates 33 are provided at the restraining points of the tension member 31 with respect to the suspended ceiling unit 2, for example, at a pitch of 2.5 m. The tension member connecting plate 33 has a square plate shape in a plan view, and the end portion of the tension member 31 is placed on the upper surface 33a and fixed with a drill screw 331 from the plate lower surface side.

As shown in FIGS. 1 and 2, the braces 32 (32A, 32B) are formed in a square shape that restrains the ends (central ends 31a) of the tension members 31 located on the outer periphery of the tension unit 3 when viewed from above. and a V-shaped intermediate brace 32B (second brace) installed in the intermediate portion of the first tension member 31A located in the middle of the tension unit 3 in top view. ) and

The braces 32A and 32B, as shown in FIGS. 5 to 8, are made of, for example, lip channel steel, and the upper end 32a is connected to the lower surface of the upper structure 11 by a first connecting metal fitting 34 and a second connecting metal fitting 36, respectively. The lower end 32b is joined to the tensile member 31 through the first brace joint plate 35. As shown in FIG. The connection fittings 34 , 36 are fixed to the upper structure 11 by anchor bolts 341 . The first connection metal fitting 34 is joined to the upper end 32 a of the brace 32 by a drill screw 342 , and the second connection metal fitting 36 is joined to the upper end 32 a of the brace 32 by a drill screw 362 . Thus, in this embodiment, the brace 32 and the upper structure 11 can be easily connected by the first connection metal 34 and the second connection metal 36 .

As shown in FIG. 5, the end brace 32A has a vertical member 321 extending in the vertical direction and a first diagonal member 322 extending obliquely upward from the lower end of the vertical member 321 . The vertical member 321 and the first diagonal member 322 are connected to the first brace joint plate 35 at their lower ends 32b, 32b, respectively, so that they are formed in a substantially L-shape when viewed from the side. are placed. The end brace 32A is arranged so that the first diagonal member 322 is positioned inside the vertical member 321 in the arrangement area of the tension unit 3 in plan view.

The first brace connection plate 35 is a plate-like member, and is arranged with its surface direction facing the vertical direction. It is fixed by the outer end portion 31 b of the material 31 and the drill screw 352 .

As shown in FIG. 7, the intermediate brace 32B has a pair of second diagonal members 323, 323 extending obliquely upward from the lower end symmetrically. The pair of second diagonal members 323 are arranged such that their respective lower ends 32b, 32b are joined to the second brace joining plate 37, thereby forming a substantially V-shape when viewed from the side. ing.

The second brace connection plate 37 is a plate-like member, and is arranged with its surface direction facing the vertical direction. It is fixed by the intermediate end portion 31 a of the tensile member 31 and the drill screw 372 .

Next, the operation of the earthquake-resistant ceiling structure 1 described above will be described in detail based on the drawings.
In the earthquake-resistant ceiling structure 1 according to this embodiment, as shown in FIGS. 1 and 2, the tensile members 31 joined to the upper part of the suspended ceiling unit are arranged so as to extend in the horizontal direction. By connecting the outer end portion 31b to the upper structure 11 via the square end brace 32A that restrains the outer end portion 31b, the suspended ceiling unit 2 moves in the horizontal direction integrally with the building frame. Amplification of shaking can be suppressed.
That is, in the earthquake-resistant ceiling structure 1 of this embodiment, the horizontal inertial force of the ceiling that acts during an earthquake can be reliably transmitted to the building frame, and the ceiling can be attached to walls, pillars, beams, etc. of the building as in the conventional art. It is possible to realize a ceiling structure with high load-bearing rigidity that prevents collisions with the frame.

In this embodiment, both the tension unit 3 and the suspended ceiling unit 2 have a structure in which the vertical support is borne by the hanging members 4 arranged in a short span, so the bending load in the vertical direction can be set small, and the tension unit 3 bears it. A large horizontal load can be efficiently transmitted by the tensile force of the metal.
In this embodiment, the distance between the restraint points against the horizontal force, which is the joint with the tension unit 3, can be arbitrarily set. The bending load due to force is reduced, and it is possible to design an earthquake-resistant ceiling in which the suspended ceiling unit 2 including the earthquake-resistant member is made of low-cost, light-weight shaped steel.

In addition, in this embodiment, the braces are basically placed at the ends of the ceiling, so the degree of freedom in equipment layout can be increased in the space above the ceiling with a certain span, and it is possible to flexibly respond to equipment renovations. A seismic ceiling can be realized.

In addition, in the present embodiment, by installing the intermediate brace 32A for intermediate stiffening at the intermediate portion of the tension member 31, the tension member 31 can be configured with a larger span.

As described above, the earthquake-resistant ceiling structure according to this embodiment can realize a ceiling structure with high load-bearing rigidity. A viable earthquake-resistant ceiling can be provided.

Although the embodiments of the earthquake-resistant ceiling structure according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the scope of the present invention.

For example, in the present embodiment, the tension member connection plate 33 that connects the tension members 31 is provided in the tension unit 3, but the configuration of the tension member connection plate 33 can be set as appropriate. In short, it is sufficient that the tension members 31 extending in the same direction are connected so as to be coaxially connected.

A plate-shaped brace joining plate 35 joins the lower ends of a pair of brace members in the brace 32 (the vertical member 321 and the first diagonal member 322 in the end brace 32A, and the pair of second diagonal members 323 in the intermediate brace 32B). are provided, other joining structures may be employed.

Furthermore, in the present embodiment, an intermediate brace 32B (second brace) serving as intermediate stiffening is provided at the intermediate portion in the length direction of the tensile member 31, but the provision of the intermediate brace 32B is limited. No, you can omit it. For example, if the length of the tension unit 3 is short and sufficient strength can be ensured, the intermediate brace can be omitted. That is, by installing the intermediate brace 32B as in this embodiment, it is possible to configure a large-span tension unit.

Furthermore, in the above-described embodiment, the end brace 32A adopts a brace that is substantially L-shaped when viewed from the side, and the intermediate brace 32B adopts a brace that is substantially V-shaped when viewed from the side. However, it is not limited to this, and for example, it is also possible to apply a brace formed in a substantially V shape to the end brace 32A.

In the present embodiment, the suspended ceiling unit 2 is composed of the joist receiving orthogonal member 30, the joist receiving member 21, the joist receiving member 22, and the metal joints thereof, but it is not limited to such a configuration. do not have. For example, it is possible to omit the underlying material such as the joist receiving orthogonal member 30 depending on the support span and member cross-sectional performance. can be adopted.

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the scope of the present invention.

1 Earthquake-resistant ceiling structure 2 Suspended ceiling unit 3 Tension unit 4 Suspension member 11 Upper structure 21 Ceiling joist receiving material 22 Ceiling joist 23 Ceiling panel (ceiling plate)
30 joist receiving orthogonal material (backing material joining member)
31 tension member 31a intermediate end 31b outer end 32 brace 32a upper end 32A end brace (first brace)
32B intermediate brace (second brace)
33 Tension member connecting plate 34 First connection metal fitting 35 First brace joint plate 36 Second connection metal plate 37 Second brace joint plate 38 Seismic clip 41 Seismic hanger X1 First horizontal direction X2 Second horizontal direction

Claims (4)

a suspended ceiling unit that is suspended and supported by a superstructure of a building frame via a suspension member;
a tension unit joined to the top of the suspended ceiling unit and bearing a horizontal load of the suspended ceiling unit;
The tension unit is
Tension members arranged horizontally and vertically and horizontally;
a first brace that constrains the end of the tensile member with the building frame;
a tension member connecting plate that connects the tension members to each other at the intersection of the tension members arranged to extend in the horizontal and vertical directions;
An earthquake-resistant ceiling structure characterized in that the intersections of the tensile members extending vertically and horizontally are provided as restraint points against horizontal force so that they can be arbitrarily set without installing separate braces in the ceiling space between fixed spans. . 2. An earthquake-resistant ceiling structure according to claim 1, wherein a second brace for intermediate stiffening is provided at an intermediate portion of said tensile member in the longitudinal direction. The suspended ceiling unit has a ceiling base material and a ceiling panel, and is vertically supported by the upper structure via the suspension member. The earthquake-resistant ceiling structure according to claim 1 or 2, wherein the ceiling structure is supported in a direction. The suspended ceiling unit comprises a substrate joining member joined to the tension unit,
The tension members are connected to the base material joining members arranged through the tension member connecting plates so as to pass through the intersection of the members in the horizontal vertical direction and the members in the horizontal horizontal direction with respect to the suspended ceiling unit. An earthquake-resistant ceiling structure according to any one of claims 1 to 3, characterized in that the ceiling structure is combined.

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