JP2014224375A - Hanging ceiling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hanging ceiling structure that can reliably suppress lateral vibration of a ceiling in the earthquake, by surely exhibiting effect of reinforcement braces and improving earthquake resistance.SOLUTION: A hanging ceiling structure B includes: a ceiling base 9 formed by assembling steel materials 7, 8 in a lattice pattern extending in one direction T1 and other direction T2 of the level; suspending members 4 with upper ends connected to a superstructure of a building and lower ends connected to the ceiling base 9, and suspending and supporting the ceiling base 9; plate-like ceiling materials 6 mounted to the lower surface of the ceiling base 9 and forming a ceiling surface; and reinforcement braces each having the upper end directly or indirectly connected and obliquely installed to the superstructure, and having the lower end connected to the ceiling base 9 in the same way, respectively. Belt-shaped tensile stiffening members 12 are included which are fixed to the lower surface of the ceiling base 9 and interposed between the ceiling base 9 and the ceiling materials 6, and extended to intersect in one direction T1 and the other direction T2.

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, for example, as shown in FIGS. 5 and 6, a plurality of field edges 1 arranged in parallel in a horizontal direction T1 with a predetermined interval, and field edges 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 grid-like ceiling composed of a plurality of suspension bolts (suspending members) 4 fixedly attached to an upper structure (building frame) 3 such as a floor material on the upper floor, a field edge 1 and a field edge receiver 2 There is a configuration including a ceiling panel (ceiling material) 6 such as a gypsum board which is integrally attached by screwing to the base 9 (the lower surface of the field edge 1) and forms a ceiling surface (ceiling portion 5).

  For example, as shown in FIGS. 7 and 8, for example, a suspended ceiling (suspended ceiling structure) A in which a heavy equipment such as a fan filter unit needs to be installed on the ceiling as in a clean room is horizontal. A plurality of T bars (support members having a reverse T-shaped cross section) 7 that are arranged in parallel in one direction T1 at a predetermined interval and extend in another direction T2 orthogonal to one direction T1, and the upper end is fixed to the upper structure. A plurality of suspension bolts (suspending members) 4 arranged with the lower end side connected to the T-bar 7, extending in one horizontal direction T 1 so as to span the T-bar 7, and having a predetermined interval in the other direction T 2. Are attached to the ceiling-like ceiling base 9 composed of the T-bar 7 and the connection bar 8 by being screwed together and attached to the ceiling surface (ceiling part 5). And a ceiling panel (ceiling material) 6 forming There is also.

  In addition, the suspended ceiling A is likely to roll due to the horizontal force acting during an earthquake due to its structure, and the end of the ceiling 5 collides with a building component such as a wall, column, or beam due to this roll. However, the ceiling panel 6 may be damaged or fall off. Therefore, conventionally, as shown in FIGS. 6 and 8, the upper end side is connected to the upper structure 3 and the like, and the lower end side is connected to the suspension bolt 4, the field edge 1, the field edge receiver 2, the T bar 7, and the connection bar 8. A reinforcing brace 10 is provided by connecting to a ceiling base 9 formed by assembling a steel material such as a grid so as to suppress rolling of the ceiling portion 5 including the ceiling base 9 and the ceiling panel 6 during an earthquake.

JP 2008-121371 A JP 2005-350950 A

  On the other hand, in the suspended ceiling A as described above, the ceiling panel 6 exhibits surface rigidity, and the ceiling inertia force (horizontal force) at the time of an earthquake is transmitted to the reinforcing brace 10 through the ceiling panel 6 and the ceiling base 9 to roll. Can be suppressed.

  However, when the ceiling panel 9 formed by assembling the steel materials 1, 2, 7, and 8 in a grid pattern is constructed by penetrating and fixing a ceiling panel 6 such as a directly-attached rock wool sound absorbing board, which is lighter than gypsum board, with screws. Since this type of ceiling material 6 has a low screw joint strength, it is difficult to ensure the surface rigidity of the ceiling panel 6, and in-plane deformation occurs in the ceiling panel 6 at the time of an earthquake, and the ceiling inertia force is exerted up to the reinforcing brace 10. There was a risk of not being transmitted smoothly. That is, in this case, the effect of the reinforcing brace 10 is not sufficiently exhibited, and there is a possibility that the roll may occur and the ceiling panel 6 may be damaged or dropped off.

  In view of the above circumstances, the present invention provides a suspended ceiling structure that reliably improves the seismic performance by demonstrating the effect of a reinforcing brace and reliably suppresses rolling of the ceiling portion during an earthquake. With the goal.

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

  The suspended ceiling structure of the present invention has a ceiling base formed by extending a horizontal direction in one direction and the other direction and assembled with a steel material in a lattice shape, an upper end connected to the upper structure of the building, and a lower end connected to the ceiling base. A suspension member that supports the ceiling foundation in a suspended manner, a plate-like ceiling material that is attached to the lower surface of the ceiling foundation to form a ceiling surface, the upper end is the upper structure, and the lower end is the ceiling foundation, In a suspended ceiling structure including a reinforcing brace that is obliquely connected and connected directly or indirectly, the suspension ceiling structure is fixed to the lower surface of the ceiling base and is interposed between the ceiling base and the ceiling member. It is characterized by comprising a belt-like tensile stiffening member extending so as to intersect the direction and the other direction.

  In this invention, since the belt-like tension stiffening member is interposed between the ceiling base and the ceiling material so as to intersect in one horizontal direction and the other direction, the ceiling material (ceiling panel) The ceiling inertia force (horizontal force) can be transmitted from the ceiling base to the reinforcing brace by the tensile stiffness of the tensile stiffening member instead of (not only) the surface rigidity.

  Further, in the suspended ceiling structure of the present invention, it is desirable that the pair of tensile stiffening members arranged in an X shape is provided so that the intersecting portion substantially overlaps the lower end of the reinforcing brace in the vertical direction. .

In this invention, a plurality of tensile stiffening members are provided, and a pair of tensile stiffening members arranged in an X shape are provided so as to substantially overlap with the lower ends connecting the intersections to the ceiling base of the reinforcing brace. Thus, it is possible to transmit the ceiling inertia force during an earthquake to the reinforcing brace more reliably and effectively through the pair of tension stiffening portions arranged in the X shape.
Here, in the present invention, “so that the intersecting portion substantially overlaps the lower end connecting the ceiling base of the reinforcing brace” means “a pair of tension compensation so that the ceiling inertia force can be effectively transmitted to the reinforcing brace”. This means that the intersection of the rigid members is provided not only directly below the lower end of the reinforcing brace but also near the lower end.

  Furthermore, in the suspended ceiling structure of the present invention, it is more desirable that the tensile stiffening member is formed using at least one of steel material, resin material, fiber sheet, and FRP.

  In this invention, a steel sheet (steel material), a resin sheet (resin material), a fiber sheet formed using fibers having excellent tensile strength such as carbon fiber, aramid (trademark) fiber, glass fiber, FRP (fiber reinforced plastic) By forming a tension stiffening member using at least one of a plate and an FRP sheet, it is possible to reliably make the member excellent in tensile rigidity, and more reliably and effectively reduce the inertial force of the ceiling during an earthquake. It can be transmitted to the reinforcing brace.

  In the suspended ceiling structure of the present invention, since the belt-like tensile stiffening member is interposed between the ceiling base and the ceiling material so as to intersect in one horizontal direction and the other direction, the ceiling material ( The ceiling inertia force can be transmitted from the ceiling base to the reinforcing brace not by the surface rigidity of the ceiling panel but by the tensile rigidity of the tension stiffening member.

  As a result, for example, even when a suspended ceiling structure is constructed by screwing a ceiling material such as a lightweight directly-attached rock wool sound-absorbing board to the ceiling base, the ceiling in the event of an earthquake can be reliably and effectively transmitted through the tension stiffening member. Inertial force can be transmitted to the reinforcing brace, and the effect of the reinforcing brace can be sufficiently exerted to suppress rolling.

  Therefore, according to the suspended ceiling structure of the present invention, the belt-shaped tensile stiffening member is provided, so that the effect of the reinforcing brace can be reliably exerted to improve the seismic performance, and the rolling of the ceiling portion during the earthquake can be ensured. It is possible to suppress the breakage and dropout of the ceiling material.

It is a perspective view from the ceiling surface side which shows the suspended ceiling structure which concerns on one Embodiment of this invention. It is a top view of the suspended ceiling structure which concerns on one Embodiment of this invention. It is a figure which shows the modification of the suspended ceiling structure which concerns on one Embodiment of this invention, and is a top view view from the ceiling surface side. It is a figure which shows the modification of the suspended ceiling structure which concerns on one Embodiment of this invention, and is a top view view from the ceiling surface side. It is a perspective view from the ceiling surface side which shows the conventional suspended ceiling structure. FIG. 6 is a side view of the conventional suspended ceiling structure shown in FIG. 5. It is a perspective view from the ceiling surface side which shows the conventional suspended ceiling structure. It is a perspective view from the ceiling back side of the conventional suspended ceiling structure shown in FIG.

  Hereinafter, a suspended ceiling structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.

  As shown in FIGS. 1 and 2, the suspended ceiling structure B of the present embodiment is arranged in parallel at a predetermined interval in one horizontal direction T1 as in the conventional ceiling structure A shown in FIGS. A plurality of T bars (support members having a reverse T-shaped cross section) 7 extending in the other direction T2 orthogonal to one direction T1, and an upper end fixed to the upper structure and a lower end side connected to the T bar 7. A plurality of suspension bolts (suspending members) 4 extend in one horizontal direction T1 and are connected to the T-bar 7 so as to be connected to each other, and are disposed at predetermined intervals in the other direction T2. A plurality of inverted T-shaped connecting bars (T bars) 8 and a ceiling panel (ceiling member) 6 that is screwed to the ceiling base 9 and integrally attached to form a ceiling surface (ceiling part 5). It is configured. Further, the ceiling base 9 is composed of the T bar 7 and the connecting bar 8, that is, a steel material assembled in a lattice shape.

  Further, as shown in FIG. 2 (see FIG. 8), a reinforcing brace 10 is provided on the gusset plate 11 by screwing the lower end side to the T bar 7. At this time, in this embodiment, for example, a pair of reinforcing braces 10 are arranged side by side so as to exhibit a V shape in one direction T1, and the lower ends of the pair of V type reinforcing braces 10 arranged in parallel in this one direction T1. A pair of reinforcing braces 10 are arranged side by side in the other direction T2 with the intersection portion and the intersection portion of each other in the same position.

  In the present embodiment, a lightweight ceiling panel 6 such as a directly-attached rock wool sound absorbing board is fixed to the lower surface of the ceiling base 9 with a screw penetrating from the lower side to the ceiling panel 6 and the ceiling base 9. ing. In this way, the ceiling surface is formed by attaching the plurality of ceiling panels 6 to the ceiling base 9.

  On the other hand, in the suspended ceiling structure B of the present embodiment, as shown in FIGS. 1 and 2, a belt-like tensile stiffening member 12 is interposed between the ceiling base 9 and the ceiling panel 6. Yes. This belt-shaped tensile stiffening member 12 is a member having excellent tensile strength in the length direction. In this embodiment, for example, a belt-shaped steel plate such as a steel sheet having a thickness of about 0.4 mm and a width of about 30 mm is applied. It extends so as to intersect both the direction T1 and the other direction T2 (in the present embodiment, it intersects at an angle of 45 degrees).

  The tension stiffening member 12 is fixed to the lower surface of the ceiling base 9 with screws. Further, in the present embodiment, the pair of belt-like tensile stiffening members 12 are crossed and provided in an X shape, and the intersection 13 of the pair of tensile stiffening members 12 is a pair of V-shaped reinforcing braces in plan view. It is provided so as to be near or at the same position as the 10 intersection points. That is, a pair of tensile stiffening members 12 arranged in an X shape are provided so that the intersecting portion 13 substantially overlaps the lower end of the reinforcing brace 10 in the vertical direction T3. In addition, the intersection 13 of the pair of tensile stiffening members 12 may not necessarily be provided in the vicinity of the intersection of the pair of V-shaped reinforcing braces 10 in the plan view or at the same position as the intersection.

  In addition, in the belt-like tensile stiffening member, for example, a fiber sheet such as carbon fiber, aramid (trademark) fiber, glass fiber, a sheet-like member in which wires such as steel wire are bundled, a resin, a plate shape made of FRP, A sheet-like member or the like may be applied. That is, the strip-shaped tensile stiffening member 12 only needs to be excellent in tensile strength, and need not be limited to the strip-shaped steel plate. The tension stiffening member 12 is not necessarily arranged in an X shape, and one or more tension stiffening members 12 are placed on the lower surface of the ceiling base 9 in one direction T1 and the other direction T2. It is sufficient if it is provided so as to intersect. Further, at this time, the tensile stiffening member 12 may not have an intersecting angle of 45 degrees with respect to the one direction T1 and the other direction T2.

  As described above, in the suspended ceiling structure B of the present embodiment in which the belt-like tensile stiffening member 12 is interposed between the ceiling base 9 and the ceiling panel 6, screws such as a directly attached rock wool sound absorbing board are used. Even when the ceiling panel 6 having a low joint strength is used, the rigidity is secured by the tensile stiffening member 12 instead of the surface rigidity of the ceiling panel 6. For this reason, when an earthquake occurs, the tensile stiffening member 12 exhibits rigidity, so that in-plane deformation of the ceiling panel 6 is prevented, and the ceiling inertia force (horizontal force) is transmitted from the tensile stiffening member 12 to the ceiling. It is smoothly transmitted to the reinforcing brace 10 through the base 9.

  Therefore, in the suspended ceiling structure B of the present embodiment, the belt-like tensile stiffening member 12 is interposed between the ceiling base 9 and the ceiling panel 6 so as to intersect the horizontal one direction T1 and the other direction T2. Therefore, at the time of an earthquake, the ceiling inertia force can be transmitted to the reinforcing brace 10 not by the surface rigidity of the ceiling panel 6 but by the tensile rigidity of the tensile stiffening member 12.

  Thereby, for example, even when the suspended ceiling structure B is configured by screwing the ceiling panel 6 such as a lightweight directly-attached rock cotton sound absorbing board to the ceiling base 9, the tension stiffening member 12 is securely and effectively passed. The ceiling inertia force at the time of an earthquake can be transmitted to the reinforcement brace 10, the effect by the reinforcement brace 10 can fully be exhibited, and a roll can be suppressed.

  Therefore, according to the suspended ceiling structure B of the present embodiment, by providing the belt-like tensile stiffening member 12, the effect of the reinforcing brace 10 is reliably exhibited to improve the earthquake resistance, and the ceiling portion 5 in the event of an earthquake. Can be reliably suppressed, and the breakage and dropout of the ceiling panel 6 can be suppressed.

In other words, compared to gypsum board finished ceiling (approx. 20kg / m ² with 2 sheets, about 15kg / m ² with board-discarded rock wool sound absorbing board), it is a lightweight directly bonded rock absorbing board with low screw joint strength. Even if the ceiling panel 6 as described above is used, the provision of the tensile stiffening member 12 makes it possible to obtain excellent seismic performance.

  Further, in the suspended ceiling structure B of the present embodiment, a plurality of tensile stiffening members 12 are provided, and a pair of tensile stiffening members 12 arranged in an X shape crosses the crossing portion 13 of the ceiling base 9 of the reinforcing brace 10. Is provided so as to be substantially overlapped with the lower end connected to the ceiling, and through the pair of tensile stiffening portions 12 arranged in the X shape, the ceiling inertia force at the time of earthquake is more reliably and effectively applied to the reinforcing brace 10. It becomes possible to transmit.

  Furthermore, steel sheets (steel materials), resin sheets (resin materials), fiber sheets formed using fibers having excellent tensile strength such as carbon fibers, aramid (trademark) fibers, glass fibers, FRP (fiber reinforced plastic) plates, FRP By forming the tension stiffening member 12 using at least one type of sheet, it is possible to reliably make the member excellent in tensile rigidity, and to further reliably and effectively reinforce the ceiling inertia force during an earthquake. 10 can be transmitted.

  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, in the present embodiment, the T bar 7 and the connecting bar 8 are provided, and the ceiling base 9 is formed by assembling the T bar 7 and the connecting bar 8 in a lattice shape. For example, FIG. A ceiling base 9 in which the field edge 1 and the field edge receiver 2 shown in FIG. 6 are assembled in a lattice shape, and a ceiling material 6 that is attached to the field edge 1 of the ceiling base 9 by screwing to form a ceiling surface. The suspended ceiling structure B may be configured with a belt-like tensile stiffening member 12 interposed therebetween. Even in this case, it is possible to obtain the same effect as that of the present embodiment. In other words, the ceiling foundation according to the present invention may be arranged in a lattice shape in plan view, and there is no need to particularly limit other configurations.

Further, in the present embodiment, a pair of belt-like tensile stiffening members 12 are crossed and provided in an X shape on the lower surface of the ceiling base 9, and the intersection 13 of the pair of tensile stiffening members 12 is V in plan view. It demonstrated as what is provided so that it may become near the intersection part of a pair of reinforcement brace 10 of a type | mold, or the same position as an intersection part.
On the other hand, as shown in FIG. 3 and FIG. 4, a pair of tensile stiffening members 12 may be arranged in an X shape at positions corresponding to the installation positions of the plurality of reinforcing braces 10. That is, if it is possible to effectively transmit a horizontal force to the reinforcing brace 10, there is no need to particularly limit the installation position and number (number of sets) of the pair of tension stiffening members 12. It is possible to obtain the same effect as the embodiment.

1 Field edge (steel)
2 Field guard (steel)
3 Superstructure 4 Hanging bolt (hanging member)
5 Ceiling part 6 Ceiling panel (ceiling material)
7 T bar (steel)
8 Connection bar (steel)
9 Ceiling base 10 Reinforcement brace 11 Gusset plate 12 Tensile stiffening member 13 Intersection A Conventional suspended ceiling structure B Suspended ceiling structure T1 One direction T2 Other direction T3 Vertical direction

Claims (3)

A ceiling base that extends in one horizontal direction and the other in a horizontal direction and is assembled in a grid, and the upper end is connected to the superstructure of the building, the lower end is connected to the ceiling base, and the ceiling base is suspended and supported A suspension member, a plate-like ceiling member attached to the lower surface of the ceiling base to form a ceiling surface, an upper end connected to the upper structure, and a lower end connected to the ceiling base directly or indirectly, respectively. In the suspended ceiling structure provided with a reinforcing brace installed obliquely,
A belt-like tensile stiffening member that is fixed to the lower surface of the ceiling base and is interposed between the ceiling base and the ceiling material and extends so as to intersect the one direction and the other direction. A suspended ceiling structure characterized by being constructed. The suspended ceiling structure according to claim 1,
A suspended ceiling structure characterized in that a pair of tensile stiffening members arranged in an X shape are provided so that the intersecting portion thereof substantially overlaps the lower end of the reinforcing brace in the vertical direction. The suspended ceiling structure according to claim 1 or 2,
The suspended ceiling structure, wherein the tensile stiffening member is formed using at least one of a steel material, a resin material, a fiber sheet, and FRP.

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