JP6041142B2 - Suspended ceiling structure - Google Patents

Description

  The present invention relates to a suspended ceiling structure.

  Conventionally, suspended ceilings are frequently used as ceilings of buildings such as schools, hospitals, production facilities, gymnasiums, pools, airport terminal buildings, office buildings, theaters, cinecones, etc. (see, for example, Patent Document 1 and Patent Document 2). . And in the suspended ceiling (suspended ceiling structure) A, as shown in FIGS. 1 and 2, for example, a plurality of field edges 1 arranged in parallel at a predetermined interval in a horizontal direction T1, and a field edge 1 A plurality of field receivers 2 that are arranged in parallel in the other horizontal direction T2 at predetermined intervals and are integrally connected to a plurality of field edges 1, and the lower ends are connected to the field receiver 2. A plurality of suspension bolts (suspending members) 4 that are fixedly attached to an upper structure (building frame) 3 such as a floor material on the upper floor and the lower surface of the field edge 1 are integrally attached by screwing or the like. And a ceiling panel (ceiling material) 6 that forms a ceiling surface (ceiling part 5).

  For example, as shown in FIG. 3, for example, a suspended ceiling (suspended ceiling structure) A in which a heavy equipment such as a fan filter unit is required to be installed on the ceiling as in a clean room, the horizontal direction A plurality of T bars (supporting members having a reverse T-shaped cross section) 7 that are arranged in parallel with T1 at a predetermined interval and extend in another direction T2 orthogonal to one direction T1, and an upper floor material (upper structure) on the upper end side ) And the like, and a plurality of suspension bolts (suspending members) 4 arranged with the lower end side connected to the T-bar 7 and the T-bar 7 adjacent to each other in one direction T1 are arranged over the ceiling. Some have a ceiling panel 6 that forms a surface (ceiling part 5).

  On the other hand, the suspended ceiling A configured as described above is easy to roll due to the horizontal force acting during the earthquake due to its structure, and the end of the ceiling portion 5 is wall, column, beam, etc. There is a possibility that the ceiling panel 6 may be damaged or fall off due to a collision with a building component. Therefore, conventionally, as shown in FIGS. 2 and 3, the upper end side is connected to the upper structure and the like, and the lower end side is the ceiling base 8 such as the suspension bolt 4, the field edge 1, the field edge receiver 2, and the T-bar 7. A reinforcing brace 9 is provided in connection with the ceiling, and the rolling of the ceiling portion 5 including the ceiling base 8 and the ceiling panel 6 is suppressed during an earthquake.

JP 2008-121371 A JP 2005-350950 A

  However, if a large-scale earthquake or the like occurs and an excessive external force acts on the reinforcing brace, and this reinforcing brace buckles, the yield strength will drop significantly and suddenly, and the ceiling panel and ceiling base may be damaged or dropped off. There is. For this reason, further improvement in earthquake resistance is desired for this type of suspended ceiling, and it is strongly desired to prevent the ceiling from falling off more reliably from the viewpoint of protecting human life.

  In view of the above circumstances, the present invention is a suspended ceiling that improves seismic performance and suppresses rolling of the ceiling part during an earthquake, and can reliably prevent falling off of the ceiling material during an earthquake. The purpose is to provide a structure.

  In order to achieve the above object, the present invention provides the following means.

  The suspended ceiling structure of the present invention includes a ceiling base suspended from and supported by a plurality of suspension members whose upper ends are connected to a building component on the back side of the ceiling, and a plate-like ceiling material that is attached to the ceiling base and forms a ceiling surface In the suspended ceiling structure comprising: a frame portion formed in a lattice shape, connected to the ceiling material and disposed along the ceiling surface, and one end on the end side of the frame portion And the other end is connected to a building component arranged on the outer side in the lateral direction of the outer peripheral end of the ceiling material, and a preset external force acts and the frame portion and the building component The fuse portion configured to release the connected state, and one end connected to the end portion side of the frame portion, and the other end connected to the building constituent member on the ceiling back side, the frame formed by the fuse portion And the building component With coupling state is released, characterized in that it is constituted by a suspension support portion for supporting hanging the frame portion.

  In the suspended ceiling structure of the present invention, it is desirable that the fuse portion is configured to break when a preset external force is applied, and to release the connection state between the frame portion and the building component. .

  Furthermore, in the suspended ceiling structure of the present invention, it is more preferable that the fuse portion includes a damper that absorbs and attenuates a horizontal force acting on the ceiling portion made of the ceiling base and the ceiling material.

  In the suspended ceiling structure of the present invention, the fuse portion is connected to the lattice-shaped frame portion by providing a lattice-shaped frame portion and a fuse portion that connects the frame portion and a building component such as a wall, a pillar, or a beam. Thus, an external force (such as a horizontal force during an earthquake) acting on the ceiling material and the ceiling portion can be transmitted to the building component, and the seismic performance of the suspended ceiling can be improved.

  Also, if the frame part receives a ceiling material or a ceiling part that has fallen due to a pre-set external force such as a horizontal force during an earthquake (an external force greater than a preset external force) acting on the fuse part or being damaged When a preset external force is applied to the part, the fuse part is broken, and the connection between the frame part and the building component by the fuse part is released. When the connection between the frame part and the building component by the fuse part is released in this way, the lattice-like frame part is supported by the suspension support part, and the frame part and the suspension support part are fail-safe. It functions as a net and can prevent the ceiling material from falling off.

  Therefore, according to the suspended ceiling structure of the present invention, by attaching the fuse part and the suspension support part to the lattice-like frame part, it is possible to configure both the earthquake-resistant mechanism and the fail-safe mechanism. It becomes possible to improve economy and improve seismic performance, and prevent ceiling materials from falling off (improve fail-safe performance).

  In addition, in the suspended ceiling structure of the present invention, when a preset external force is applied and the fuse part is broken and the connection state between the frame part and the building component is released, the structure of the fuse part is simplified. Therefore, it is possible to easily and reliably apply a preset external force and to release the connection state between the frame portion and the building component.

  In addition, in the suspended ceiling structure of the present invention, when the fuse part is configured with a damper, the horizontal force acting on the ceiling part during an earthquake can be absorbed and attenuated, and the rolling of the ceiling part is effectively prevented. It becomes possible to suppress. And by suppressing the rolling of a ceiling part by a fuse part in this way, it becomes difficult to produce a breakage | damage or drop | offset of a ceiling material or a ceiling part, and it becomes possible to improve an earthquake-proof performance reliably.

It is a perspective view which shows the suspended ceiling structure where the ceiling base was comprised by the field edge and the field edge receiver. It is a sectional side view which shows the suspended ceiling structure where the ceiling base was comprised by the field edge and the field edge receiver. It is a perspective view which shows the suspended ceiling structure by which the ceiling base | substrate was comprised with T bar. It is a sectional side view which shows the suspended ceiling structure concerning one Embodiment of this invention. It is a perspective view from the ceiling surface side which shows the suspended ceiling structure concerning one Embodiment of this invention. It is a sectional side view showing the suspended ceiling structure concerning one embodiment of the present invention, and is a sectional side view showing the state where seismic force is transmitted to the building component by the fuse part at the time of a normal earthquake. 1 is a side sectional view showing a suspended ceiling structure according to an embodiment of the present invention, and when a ceiling is dropped due to a large-scale earthquake or the like, a fuse part is broken, and a frame part and a suspension support part are fail-safe nets. It is a sectional side view which shows the state which is functioning as.

  Hereinafter, a suspended ceiling structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7. Here, the present embodiment relates to a suspended ceiling structure that has excellent seismic performance and excellent fail-safe performance against falling off the ceiling.

  The suspended ceiling (suspended ceiling structure) B of this embodiment is similar to the suspended ceiling A shown in FIGS. 1 and 2, the field edge 1, the field edge receiver 2, the suspension member (suspending bolt) 4, and the ceiling material 6. A reinforcing brace 9 is provided.

  The field edge 1 is, for example, a grooved steel having a U-shaped cross section, and extends horizontally, and is arranged in parallel at a predetermined interval in a horizontal direction T1 in one horizontal direction. .

  The field edge receiver 2 is, for example, a grooved steel having a U-shaped cross section, is horizontally extended, and is arranged in parallel with a predetermined interval in the horizontal direction T2 in the other horizontal direction. Yes. At this time, the field edge receiver 2 is disposed so as to intersect the field edge 1 and is disposed in a state of being placed on the plurality of field edges 1. Each field edge receiver 2 is connected to the field edge 1 by using a clip (field edge connection fitting) 10 at an intersection where it intersects the field edge 1.

  The suspension member 4 is a suspension bolt that is formed in a cylindrical bar shape and has an external thread threaded on the outer peripheral surface thereof, and its upper end is fixed to the upper structure 3 (the building component member 13 on the back side of the ceiling) such as an upper floor. Alternatively, the hanger (hanging member connecting bracket) 11 is used to connect the lower end side to the field receiver 2 by using a hanger (hanging member connecting bracket) 11. Further, the plurality of suspension members 4 are dispersedly arranged at a predetermined interval.

The ceiling material (ceiling panel) 6 is formed by laminating two boards and integrally stacking them. For example, the ceiling material (ceiling panel) 6 is formed with a weight of about 20 kg per 1 m ² together with the weight of a ceiling accessory. The ceiling material 6 is installed on the lower surfaces of the plurality of field edges 1 by screws or the like. The ceiling material 6 may be composed of one board and three or more boards.

  The reinforcing brace 9 is, for example, a grooved steel formed in a U-shaped cross section. The upper end side is connected to the upper structure 3 and the lower end side is connected to the suspension bolt 4, the field edge 1, the field edge receiver 2, and the like. Is provided. Note that the reinforcing brace 9 is not necessarily provided.

  In the suspended ceiling B, the field edge 1, the field edge receiver 2, and the ceiling material 6 are suspended and supported by the upper structure 3 of the building via the suspension member 4. Further, the ceiling base 8 is formed by the field edge 1 and the field edge receiver 2, the ceiling surface 6 of the lower floor is formed by the ceiling material 6 attached to the ceiling base 8, and the ceiling portion 5 is formed by the ceiling base 8 and the ceiling material 6. Is formed. Moreover, the rolling of the ceiling part 5 is suppressed by transmitting the external force which acts on the ceiling part 5 which consists of the ceiling base 8 and the ceiling material 6 to a building structural member (building frame) by the reinforcement brace 9 at the time of an earthquake.

  On the other hand, in the suspended ceiling B of the present embodiment, as shown in FIGS. 4 and 5, the suspension ceiling B is formed in a lattice shape, and is connected to the ceiling material 6 below the ceiling material 6 and the ceiling portion 5 and along the ceiling surface. One end is connected to the end portion of the frame portion 15 and the end portion of the frame portion 15, and the other end is arranged on the outside in the lateral direction T 1, T 2 of the outer peripheral end portion of the ceiling member 6 and the ceiling portion 5, for example. One end is connected to the end of the frame part 15 and the fuse part 16 connected to the building constituent member 13 such as the wall 12 and the beam 12 and the building constituent member 13 on the back side of the ceiling such as the upper structure 3 The suspension support portion 17 is provided with the other end connected thereto.

  The frame portion 15 extends a plurality of tensile materials 15a such as aluminum extruded shape steel, steel members, and wires in one direction T1 and the other direction T2 below the ceiling portion 5, and is disposed at a pitch of 900 to 1800 mm, for example. By doing so, it is formed in a lattice shape. The plurality of tensile members 15a are fixedly attached to the ceiling member 6 using screws or the like. The tensile material 15a may be a plate-like member, a rod-like member, a strip-like member, a tape-like member, or a sheet-like member using a steel plate, a carbon fiber sheet, or the like. When the ceiling surface (ceiling portion 5) itself has sufficient strength and measures are taken to prevent its falling, the fuse portion, which will be described in detail later, directly on the ceiling surface without using the frame portion 15. It is also possible to connect 16 and the suspension support part 17.

  The fuse portion 16 is disposed so as to be connected to one end portion side and the other end portion side of each tension member 15 a constituting the frame portion 15. The fuse portion 16 has one end connected to the end of the tension member 15a (frame portion 15), the other end of the ceiling member 6 and the column or wall disposed on the outer side in the lateral direction of the outer peripheral end of the ceiling portion 5. 12, connected to a building component 13 such as a beam. In this embodiment, the fuse part 16 is extended in the horizontal directions T1 and T2 along a ceiling surface, and has connected the tension | tensile_strength material 15a of the frame part 15, and the building structural member 13. FIG.

  Further, the fuse portion 16 is configured to release the connection state between the frame portion 15 and the building component 13 when a preset external force (force exceeding the set external force) is applied, such as during an earthquake. Specifically, in addition to using a material that breaks at a predetermined strength, a fuse portion 16 having various structures such as a friction mechanism and mechanical control is applied depending on the situation. Furthermore, the fuse part 16 of the present embodiment is configured to include a damper 16a that absorbs and attenuates a horizontal force acting on the ceiling part 5 due to an earthquake or the like. However, the damper 16a is not necessarily required.

  The suspension support portion 17 is provided so as to be connected to one end side and the other end side of each tension member 15 a constituting the frame portion 15. The suspension support portion 17 of the present embodiment is provided with one end connected to the end portion side of the frame portion 15 and the other end connected to the upper structure 3 such as a floor slab or beam on the upper floor of the building. Yes. This suspension support part 17 is formed using strip | belt-shaped members, such as a wire and a carbon fiber sheet, a tape-shaped member, a sheet-like member, etc., for example. That is, it is formed using a material that has a predetermined strength and is flexible to some extent. In the present embodiment, the suspension support portion 17 is provided so as to be connected to the upper structure 3 and the frame portion 15 of the building in a state in which a predetermined looseness is provided in advance.

  In addition, the other end of the suspension support portion only needs to be connected to the building component 13 on the back side of the ceiling. In addition to the floor slabs and beams on the upper floor, the building components such as walls, columns, and beams on the back side of the ceiling 13 may be connected. That is, the other end of the suspension support portion 17 is configured so that the frame portion 15 can be suspended and supported in a state where the connection state between the frame portion 15 and the building component 13 by the fuse portion 16 is released. What is necessary is just to be connected to the member 13. FIG.

  Next, the operation and effect of the suspended ceiling structure B of the present embodiment having the above configuration will be described.

  In the suspended ceiling structure B of the present embodiment, the grid-like frame portion 15 and the fuse portion 16 are provided, so that, as shown in FIG. External force (earthquake force, horizontal force) generated in the ceiling portion 5 is transmitted from the frame-shaped frame portion 15 to the building component 13 via the fuse portion 16. For this reason, not only the reinforcing brace 9 but also the lattice-like frame portion 15 and the fuse portion 16 function as an earthquake-resistant element and an earthquake-resistant mechanism for horizontally transmitting the seismic force, and the shaking of the ceiling portion 5 of the suspended ceiling structure B during an earthquake. Can be kept small.

  In the present embodiment, since the fuse portion 16 is configured to include the damper 16a, the external force acting on the suspended ceiling B during an earthquake is absorbed and attenuated by the damper 16a of the fuse portion 16, and the ceiling portion 5 is shaken. Furthermore, it can be kept small.

  On the other hand, as shown in FIG. 7, when a large-scale earthquake occurs, for example, a preset external force (a force exceeding the preset external force) acts on the fuse portion 16, or the ceiling base 8 or the ceiling material 6 is damaged. The frame part 15 and the building structure formed by the fuse part 16 are subjected to a preset external force acting on the fuse part 16 by receiving the ceiling member 6 and the like that have fallen off and dropped at the frame part 15 and the fuse part 16 is broken. The connected state of the member 13 is released.

  At this time, since the grid-like frame portion 15 and the suspension support portion 17 are provided, the frame portion 15 is suspended and supported by the suspension support portion 17. As a result, the frame portion 15 and the suspension support portion 17 function as a fail-safe net, and the falling off of the ceiling material 6 and the like is reliably prevented.

  Therefore, in the suspended ceiling structure B of the present embodiment, the grid-like frame portion 15 and the fuse portion 16 that connects the frame portion 15 and the building component 13 such as a wall, a column, and a beam are provided. External force (such as a horizontal force during an earthquake) acting on the ceiling material 6 and the ceiling portion 5 from the frame-shaped frame portion 15 through the fuse portion 16 can be transmitted to the building component 13, and the seismic performance of the suspended ceiling B can be improved. Can be improved. Thereby, for example, when a small and medium-scale earthquake occurs, the ceiling material 6 is not damaged, and the suspended ceiling structure B can be made excellent on BCP (Business Continuity Plan).

  In addition, the frame portion 15 receives the ceiling material 6 or the ceiling portion 5 that has fallen off when a preset external force such as a horizontal force at the time of an earthquake acts on the fuse portion 16 or breaks, and the fuse portion 16 is preset. When the external force acts, the fuse portion 16 is broken, and the connection between the frame portion 15 and the building component 13 by the fuse portion 16 can be released. Then, by releasing the connection state of the frame portion 15 and the building component 13 by the fuse portion 16 in this way, the lattice-like frame portion 15 is supported by being suspended by the suspension support portion 17. The suspension support portion 17 functions as a fail-safe net, and can prevent the ceiling material 6 and the like from falling off. Thereby, it is possible to prevent the ceiling material 6 from dropping off and threatening personal safety during an earthquake.

  In addition, the strength at which the fuse portion 16 breaks can be freely set according to the strength of the building component (building frame) 13 and the conditions such as BCP, and appropriate seismic performance is imparted to the assumed seismic force. Is possible.

  Further, for example, by adjusting the length of the suspension support portion 17 and the position of the suspension base, when the dropped ceiling material 6 is received and the frame portion 15 and the suspension support portion 17 function as a fail-safe net. In addition, the vertical displacement of the ceiling can be reduced. That is, it is possible to freely adjust and set the vertical displacement position when functioning like a fail-safe net depending on conditions such as equipment.

  Therefore, according to the suspended ceiling structure B of the present embodiment, the fuse portion 16 and the suspension support portion 17 are attached to the lattice-like frame portion 15 (single tension member 15a), so that the seismic mechanism and the fail-safe mechanism are provided. Both mechanisms can be configured, and it becomes possible to improve the seismic performance and prevent the ceiling material 6 from falling off (improve the fail-safe performance) by improving the structural rationality and economy.

  At this time, the proof strength level (the magnitude of the external force that releases the connection state by the fuse portion 16) from the seismic proof mechanism to the fail safe mechanism can be set freely and appropriately, and the degree of freedom in design and reliability It is possible to improve the seismic performance by improving the performance.

  In addition, it can be applied to new suspended ceilings B and post-installation to existing suspended ceilings B. It can be installed relatively easily regardless of whether it is newly installed or existing, and the seismic performance and fail-safe performance of suspended ceiling B can be improved. Can be given and improved.

  Further, in the suspended ceiling structure B of the present embodiment, when a preset external force acts and the fuse portion 16 is broken and the connection state between the frame portion 15 and the building component 13 is released, the fuse portion 16 The configuration can be simplified, and a preset external force can be applied easily and reliably, and the connection between the frame portion 15 and the building component 13 can be released.

  In addition, when the fuse portion 16 is configured to include the damper 16a, it is possible to absorb and attenuate external force acting on the ceiling portion 5 during an earthquake, and to effectively suppress the rolling of the ceiling portion 5. Become. And by suppressing the rolling of the ceiling part 5 with the fuse part 16 in this way, it is possible to prevent the ceiling material 6 or the ceiling part 5 from being damaged or dropped off, and it is possible to reliably improve the earthquake resistance. become.

  As mentioned above, although one embodiment of the suspended ceiling structure according to the present invention has been described, the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

  For example, a plurality of T bars 7 shown in FIG. 3, a plurality of suspension bolts (suspending members) 4, and a ceiling material 6 that is disposed so as to span the adjacent T bars 7 and forms a ceiling surface. The suspended ceiling structure B may be configured by providing a frame-type suspended ceiling having the same frame portion 15, fuse portion 16 and suspension support portion 17 as those of the present embodiment. That is, a ceiling part 5 is provided with a frame part 15, a fuse part 16, and a suspension support part 17 for a ceiling part 5 configured by attaching a ceiling material 6 that forms a ceiling surface to a ceiling base 8 supported by suspension. If B is configured, it is not particularly necessary to limit the configuration of the ceiling portion 5.

1 Field edge 2 Field edge receiver 3 Superstructure of building (building components, building frame)
4 Hanging bolt (suspending member)
5 Ceiling part 6 Ceiling panel (ceiling material)
7 T-bar 8 Ceiling base 9 Reinforcement brace 10 Clip 11 Hanger 12 Wall 13 Building component (building frame)
15 Frame part 15a Tensile material 16 Fuse part 16a Damper 17 Suspension support part A Conventional suspended ceiling (suspended ceiling structure)
B Suspended ceiling (suspended ceiling structure)
T1 Horizontal direction T2 Horizontal other direction T3 Vertical direction

Claims (3)

In a suspended ceiling structure comprising a ceiling base supported by being suspended by a plurality of suspension members connected to the building constituent member on the back side of the ceiling, and a plate-like ceiling material that is attached to the ceiling base to form a ceiling surface,
A frame portion formed in a lattice shape, below the ceiling material, and connected to the ceiling material and disposed along the ceiling surface;
One end is connected to the end portion side of the frame portion, and the other end is connected to a building component disposed on the outer side in the lateral direction of the outer peripheral end portion of the ceiling material, and a preset external force acts. A fuse part configured to release a connection state of the frame part and the building component;
One end is connected to the end portion side of the frame portion, and the other end is connected to the building component member on the ceiling side, and the connection state of the frame portion and the building component member by the fuse portion is released. A suspended ceiling structure comprising: a suspension support portion that supports the frame portion by suspension. The suspended ceiling structure according to claim 1,
The suspended ceiling structure, wherein the fuse portion is configured to be broken when a preset external force is applied and to release a connection state between the frame portion and the building component. The suspended ceiling structure according to claim 1 or 2,
The suspended ceiling structure, wherein the fuse portion is configured to include a damper that absorbs and attenuates a horizontal force acting on the ceiling portion including the ceiling base and the ceiling material.

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