JP2020165110A - Aseismatic ceiling structure - Google Patents

Abstract

To provide an aseismatic ceiling structure having a high degree of freedom of facility layout, while realizing a low cost and light weight ceiling structure with high bearing rigidity, even for a ceiling using a ceiling finishing material poor in in-plane rigidity.SOLUTION: An aseismatic ceiling structure has a suspended ceiling unit 2 suspended from an upper structure 11 of a building skeleton via a suspending member 4, and a tension unit 3 joined to an upper part of the suspended ceiling unit 2 and bearing a horizontal load of the suspended ceiling unit 2. The tension unit 3 has tension materials 31 extendedly arranged in a horizontal direction longitudinally and laterally, and end part braces 32B restraining end parts of the tension material 31 to the building skeleton. Crossing parts of the longitudinally and laterally extended tension materials 31 provide the aseismatic ceiling structure of a constitution provided in an optionally settable state without installing separate braces in an attic of a certain span as a restraining point against a horizontal force.SELECTED DRAWING: Figure 2

Description

The present invention relates to seismic ceiling structures.

Conventionally, suspended ceilings are often used as ceilings of buildings such as schools, hospitals, production facilities, gymnasiums, swimming pools, airport terminal buildings, office buildings, theaters, and cine-cons. Such suspended ceilings are arranged in parallel with a plurality of field edges arranged side by side at a predetermined interval in one horizontal direction, and a plurality of field edges orthogonal to the field edge and arranged side by side with a predetermined interval in the other horizontal direction. Multiple field edge receiving materials that are integrally connected to the field edge of the building, and the lower end is connected to the field edge receiving material, and the upper end is fixed to the upper structure (building frame) such as the floor material on the upper floor. It is configured to include a plurality of hanging bolts (hanging members) to be formed, and a ceiling panel that is integrally attached to the lower surface of the field edge by screwing or the like to form a ceiling surface on the lower floor.

On the other hand, the suspended ceiling formed by suspending and supporting the ceiling base of the field edge and the field edge receiving material and the ceiling panel with a hanging member is subject to horizontal acceleration acting during an earthquake and causes rolling. The ceiling panel behaves differently from the building skeleton due to its structure, and rolling tends to be amplified.Therefore, the ceiling panel may collide with the building skeleton such as walls, columns, and beams, and may be damaged and fall off. It was.

In order to prevent such suspended ceilings from falling off, it is known how to install diagonal members as seismic members and how to place walls that bear seismic force around the ceilings described in Notification No. 791 of the Ministry of Land, Infrastructure, Transport and Tourism. Has been done.
As another example, for example, as shown in Patent Document 1, a substantially rod-shaped tension material is provided below the ceiling panel and laterally arranged along the ceiling panel, and this tension material is used to build both ends of the building. The ceiling panel and the building skeleton are arranged by connecting to the skeleton and connecting and fixing the middle part between both ends to the ceiling panel and / or the field edge from below the ceiling panel by connecting and fixing means. There are known seismic ceiling structures that enhance the seismic performance of ceiling panels by synchronizing them, and straight ceilings that are not suspended ceilings but directly fasten to a vine shelf composed of columns and beams.

Japanese Unexamined Patent Publication No. 2013-177801

Suspended ceilings using board-based ceiling materials such as gypsum board and caucal board have high in-plane rigidity of the ceiling panel, and therefore behave integrally as a rigid floor with respect to in-plane acceleration of the ceiling panel. For this reason, it is possible to make the ceiling earthquake-resistant by installing an oblique member as an earthquake-resistant member or by arranging a wall or the like that bears the seismic force around the ceiling described in Notification No. 791 of the Ministry of Land, Infrastructure, Transport and Tourism. Board-based ceiling materials such as gypsum board and caucal board have the property that the base material strength decreases due to moisture absorption, and in the case of outdoor eaves ceilings, indoor pools, hot bath facilities, etc. in moist environments, the base material strength due to moisture absorption In many cases, panels made of materials such as metal that do not change, and ceiling finishing materials such as spandrel and bath ribs are used.

Further, even in the case of a structure as in Patent Document 1 in which a tension material is arranged on the lower surface of the ceiling panel to provide seismic resistance, the structure of the seismic ceiling is based on the in-plane rigidity of the board-based ceiling plate. It has the property that the strength of the base material decreases due to moisture absorption.

Furthermore, since ceiling finishing materials such as panels, spandrel, and bath ribs made of materials such as metal have poor in-plane rigidity, it is necessary to improve the cross-sectional performance of the ceiling base material and perform seismic design. In other words, the ceiling base material will be planned with a grape shelf, but the steel grape shelf composed of columns, beams, diagonal materials, etc. has problems such as high cost and increased load, and there is room for improvement in that respect. It was.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a low-cost and lightweight seismic-resistant ceiling structure for a ceiling using a ceiling plate having poor in-plane rigidity.

In order to achieve the above object, the seismic ceiling structure according to the present invention is joined to a suspended ceiling unit that is suspended and supported by an upper structure of a building skeleton via a suspension member and above the suspended ceiling unit. A tension unit that bears the horizontal load of the unit is provided, and the tension unit includes a tension material that extends vertically and horizontally and is arranged, and a first brace that restrains an end portion of the tension material from the building frame. The intersection of the tension members extending vertically and horizontally is provided as a restraint point against a horizontal force so as to be arbitrarily set without installing another brace behind the ceiling for a certain span. There is.

In the seismic ceiling structure according to the present invention, a tension material to be joined to the upper part of the suspended ceiling unit is arranged so as to extend in the horizontal direction, and the tension material extends the upper part via a first brace that restrains the end portion thereof. By joining to, the suspended ceiling unit behaves in the horizontal direction integrally with the building frame, and the amplification of the shaking of the suspended ceiling unit can be suppressed.
That is, in the seismic ceiling structure according to the present invention, the horizontal inertial force of the ceiling portion acting at the time of an earthquake can be reliably propagated to the building skeleton, and the ceiling portion is applied to the skeleton such as a building wall, pillar, or beam as in the conventional case. It is possible to realize a ceiling structure with high bearing capacity and rigidity to prevent collision.

Further, in the present invention, since the vertical support of both the tension unit and the suspended ceiling unit is borne by the suspension material arranged in a short span, the bending load in the vertical direction can be set small, and the large load in the horizontal direction borne by the tension unit can be set small. Can be efficiently propagated by the tensile force of the metal.
In the present invention, the distance between the restraint points for the horizontal force, which is the joint with the tension unit, can be arbitrarily set. Therefore, if the distance between the restraint points for the horizontal force is configured in a short span, the horizontal force borne by the ceiling base material is used. The bending load is reduced, and it is possible to design seismic ceilings in which the suspended ceiling unit including seismic members is made of lightweight and lightweight shaped steel at low cost.

Further, in the present invention, since the brace is basically arranged at the ceiling end, the degree of freedom in equipment layout can be increased for the ceiling behind a certain span, and it is possible to flexibly respond to equipment repair. Seismic ceilings can be realized.

Further, the seismic ceiling structure according to the present invention may be characterized in that a second brace serving as an intermediate stiffener is provided in an intermediate portion of the tension material in the length direction.

In this case, by installing a second brace that serves as an intermediate stiffener in the intermediate portion of the tensile material, the tensile material can be configured with a larger span.

Further, in the seismic ceiling structure according to the present invention, the suspended ceiling unit has a ceiling base material and a ceiling plate, is supported in the vertical direction from the upper structure via the suspended member, and is supported by the tension unit. It is supported in the horizontal direction by being tightly connected to the base material joining member installed at the restraint point against the horizontal force.

Further, in the seismic ceiling structure according to the present invention, the tension material uses a base material joining member installed at the intersection of a member in the horizontal vertical direction and a member in the horizontal and horizontal direction as a tension material connecting plate with respect to the suspended ceiling unit. It may be joined.

According to the seismic ceiling structure of the present invention, a ceiling structure having high withstand rigidity can be realized, and a low-cost, lightweight ceiling structure with high withstand rigidity can be realized in a ceiling using a ceiling finishing material having poor in-plane rigidity. Can provide a ceiling.

It is a perspective view which shows the seismic ceiling structure by embodiment of this invention, and is the figure which disassembled the suspended ceiling unit and the tension unit. It is a side view of the seismic ceiling structure seen from the second horizontal direction. It is a top view which looked at the state which connected the end of the tension material to the tension material connecting plate from the bottom. FIG. 3 is a view taken along the line AA shown in FIG. 3, which is a side view of the tension material connecting plate. It is a front view of the end brace of a tension unit. FIG. 5 is a view taken along the line BB shown in FIG. 5, which is a side view of the end brace. It is a front view of the intermediate brace of a tension unit. FIG. 7 is a view taken along the line CC shown in FIG. 7, which is a side view of the end brace.

Hereinafter, the seismic ceiling structure according to the embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the seismic ceiling structure 1 according to the present embodiment is, for example, in a building such as an outdoor eaves ceiling, an indoor pool, or a hot bath facility in a moist environment, such as a metal whose base material strength does not change due to moisture absorption. It can be applied to panels made of materials and ceilings made of ceiling finishing materials such as spandrel and bath ribs, and is applied not only to new buildings but also to renovation work to make existing buildings earthquake-resistant.

The seismic ceiling structure 1 is joined to the suspended ceiling unit 2 which is suspended and supported by the superstructure 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. It includes a tension unit 3 that transmits the horizontal inertial force of the ceiling generated at the time of an earthquake to the superstructure 11.
In the present embodiment, the tension unit 3 is arranged in a rectangular range that is long in one direction in a plan view. The longitudinal direction will be referred to as the first horizontal direction X1, and the lateral direction will be referred to as the second horizontal direction X2.

The suspended ceiling unit 2 has a field edge receiving member 21 that is suspended and supported by the superstructure 11 via the hanging member 4 and the hanging member 4, and a field that is attached to the upper surface of the field edge receiving member 21 and joined to the tension unit 3. It includes an edge receiving orthogonal member 30 (base material joining member), a field edge 22 attached to the lower surface of the field edge receiving material 21, and a ceiling panel 23 (ceiling plate) attached to the lower surface of the field edge 22. .. The lower surface of the ceiling panel 23 forms a ceiling surface. Here, the ceiling base material is composed of the above-mentioned hanging member 4, the field edge receiving material 21, the field edge 22, the field edge receiving orthogonal member 30, and the metal joints thereof.
That is, the suspended ceiling unit 2 is supported in the vertical direction from the superstructure 11 via the suspension member 4, and is tightly connected to the tension material connecting plate 33 installed at the restraint point with respect to the horizontal force of the tension unit 3 in the horizontal direction. It has a structure supported by.

The field edge receiving material 21 is, for example, a 40 × 20 × 1.6 square steel pipe, which is horizontally extended along the first horizontal direction X1 and parallel to the second horizontal direction X2 at a predetermined interval. A plurality of them are arranged in. The field edge receiving material 21 is arranged so as to intersect the field edge 22, and is arranged in a state where a plurality of field edges 22 are supported from above. The field edge receiving material 21 is connected to the field edge 22 by using a seismic clip 38 (see FIG. 2), which is a metal fitting for connecting the field edge, at a portion intersecting the field edge 22.

The field edge 22 is, for example, a thin sheet steel material specified in JIS A 6517, extends horizontally along the second horizontal direction X2, and is arranged in parallel in the first horizontal direction X1 with a predetermined interval. Has been done.

As shown in FIG. 2, the suspension member 4 is a suspension bolt formed in a cylindrical rod shape and having a male screw thread on the outer peripheral surface, and the upper end thereof is fixed to an upper structure 11 such as a floor material on an upper floor, or steel. The lower end side is connected to the field edge receiving member 21 by using a seismic hanger 41 which is a metal fitting for connecting a hanging member, and a plurality of the lower end sides are arranged. Further, the plurality of suspension members 4 are arranged with respect to the field edge receiving member 21, for example, at a pitch of 1 m. The long-term load in the suspended ceiling unit 2 and the inertial force in the vertical direction at the time of an earthquake are configured to be supported from the building frame by the suspended member 4.

The ceiling panel 23 has poor in-plane rigidity such as an aluminum spandrel, and is formed of, for example, a weight of 25 kg or less per 1 m ² together with the weight of ancillary equipment such as a ceiling. The ceiling panel 23 is installed on the lower surface of the plurality of field edges 22 by fastening with screws or the like. The ceiling panel 23 may be made of a ceiling finishing material having a poor in-plane rigidity of the ceiling surface such as a spandrel other than the aluminum spandrel, a panel, or a bath rib, or the ceiling surface may behave integrally with a large in-plane rigidity. It may be composed of a board-type ceiling panel.

As shown in FIGS. 1 and 2, the tension unit 3 is a joining member at the intersection of the tension members 31 extending vertically and horizontally in the first horizontal direction X1 and the second horizontal direction X2 and the tension members 31 in the vertical and horizontal directions. A certain tensile material connecting plate 33 and a brace 32 (32A, 32B) joined to an end portion (outer end portion 31b) of the tensile material 31 and whose upper end is fixed to the superstructure 11 are provided.

Further, the tension unit 3 is joined to the suspended ceiling unit 2 via the tension material connecting plate 33. The field edge receiving orthogonal member 30 fixed to the tension material connecting plate 33 by bolts or the like extends along the second horizontal direction X2 orthogonal to the field edge receiving member 21 when viewed from above.

The lower surface of the tension material 31 is arranged at substantially the same level (height) as the upper surface of the suspended ceiling unit 2, and for example, an aluminum extruded mold material, a flat pipe, a lightweight shaped steel, or the like can be used. In FIGS. 3 and 4, a flat steel pipe is adopted. 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 superstructure 11 of the building frame, which is a support structure effective for proof stress and rigidity. That is, the tensile member 31 is joined to the field edge receiving orthogonal member 30 of the suspended ceiling unit 2 via a tensile member connecting plate 33 installed at an intersection of a member in the horizontal vertical direction and a member in the horizontal and horizontal direction.

The tensile member 31 includes a plurality of first tensile members 31A extending in the first horizontal direction X1 (three in FIG. 1) and a plurality of second tensile members 31B extending in the second horizontal direction X2 (eight in FIG. 1). , Are arranged orthogonally to each other in the same horizontal plane vertically and horizontally. Here, as shown in FIGS. 3 and 4, the first tensile member 31A and the second tensile member 31B are joined by a tensile member connecting plate 33 at their respective intersections. As shown in FIG. 1, the tensile member 31 has an outer end portion 31b located on the outer peripheral portion of the tensile member 31 constituting the tensile member 3 when viewed from above, and is located outside the intersection (tensile member connecting plate 33). ing.

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

As shown in FIGS. 1 and 2, the brace 32 (32A, 32B) is formed in a V shape that restrains the end portion (central end portion 31a) of the tension member 31 located on the outer periphery of the tension unit 3 in a top view. V-shaped intermediate brace 32B (second brace) installed in the middle of the end brace 32A (first brace) and the first tensile member 31A located between the tension unit 3 in the top view. ) And.

As shown in FIGS. 5 to 8, for the braces 32A and 32B, for example, lip channel steel is used, and the upper end 32a has the first connecting metal 34 and the second connecting metal 36 with respect to the lower surface of the superstructure 11, respectively. The lower end 32b is joined to the tension member 31 via the first brace joint plate 35. The connecting hardwares 34 and 36 are fixed to the superstructure 11 by anchor bolts 341. The first connecting metal fitting 34 is joined to the upper end 32a of the brace 32 by a drill screw 342, and the second connecting metal fitting 36 is joined to the upper end 32a of the brace 32 by a drill screw 362. As described above, in the present embodiment, the brace 32 and the superstructure 11 can be easily connected by the first connecting metal fitting 34 and the second connecting metal fitting 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 provided so that their lower ends 32b and 32b are joined to the first brace joining plate 35 so as to be formed in a substantially V shape in a side view. Have been placed. The end brace 32A is arranged so that the first diagonal member 322 is located inside the vertical member 321 in the arrangement region of the tension unit 3 in the plan view.

The first brace joint plate 35 is a plate-shaped member, which is arranged with the surface direction facing the vertical direction, and the lower ends 32b and 32b of the vertical member 321 and the first diagonal member 322, respectively, and tension on one surface 35a. It is fixed by the outer end portion 31b 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 and 323 that extend symmetrically from the lower end to the diagonally upward direction. The pair of second diagonal members 323 are arranged so that their lower ends 32b and 32b are joined to the second brace joint plate 37 so as to be formed in a substantially V shape in a side view. ing.

The second brace joint plate 37 is a plate-shaped member, which is arranged with the surface direction facing the vertical direction, and the lower ends 32b and 32b of the pair of second diagonal members 323 and 323 on one surface 37a, respectively. It is fixed by the intermediate end portion 31a of the tension member 31 and the drill screw 372.

Next, the operation of the seismic ceiling structure 1 described above will be described in detail with reference to the drawings.
In the seismic ceiling structure 1 according to the present embodiment, as shown in FIGS. 1 and 2, the tension member 31 joined to the upper part of the suspended ceiling unit is arranged so as to extend in the horizontal direction, and the tension member 31 is the tension member 31. By joining to the superstructure 11 via the V-shaped end brace 32A that restrains the outer end 31b, the suspended ceiling unit 2 behaves in the horizontal direction integrally with the building frame, and the suspended ceiling unit 2 Amplification of shaking can be suppressed.
That is, in the seismic ceiling structure 1 of the present embodiment, the horizontal inertial force of the ceiling portion acting at the time of an earthquake can be reliably propagated to the building frame, and the ceiling portion is a wall, pillar, beam, etc. of the building as in the conventional case. It is possible to realize a ceiling structure with high bearing capacity and rigidity that prevents collision with the skeleton.

Further, in the present embodiment, since the vertical support of both the tension unit 3 and the suspended ceiling unit 2 is borne by the suspending material 4 arranged in a short span, the bending load in the vertical direction can be set small, and the tension unit 3 bears the vertical support. Large loads in the horizontal direction can be efficiently propagated by the tensile force of the metal.
In the present embodiment, the distance between the restraint points for the horizontal force, which is the joint with the tension unit 3, can be arbitrarily set. Therefore, if the distance between the restraint points for the horizontal force is configured in a short span, the ceiling base material bears the horizontal. The bending load due to the force becomes small, and it becomes possible to design a seismic ceiling in which the suspended ceiling unit 2 including the seismic member is made of lightweight and lightweight shaped steel at low cost.

Further, in the present embodiment, since the brace is basically arranged at the ceiling end, the degree of freedom in equipment layout can be increased for the ceiling of a certain span, and it is possible to flexibly respond to equipment repair. Seismic ceilings can be realized.

Further, in the present embodiment, the tensile member 31 can be configured with a larger span by installing the intermediate brace 32A which is an intermediate stiffener in the intermediate portion of the tensile member 31.

As described above, in the seismic ceiling structure according to the present embodiment, a ceiling structure having high withstand rigidity can be realized, and in a ceiling using a ceiling finishing material having poor in-plane rigidity, a low-cost, lightweight ceiling structure with high withstand rigidity can be realized. It is possible to provide a feasible earthquake-resistant ceiling.

Although the embodiment of the seismic ceiling structure according to the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately modified without departing from the spirit of the present invention.

For example, in the present embodiment, the tension unit 3 is provided with a tension material connecting plate 33 for connecting the tension materials 31 to each other, and the configuration of the tension material connecting plate 33 can be appropriately set. The point is that the tension members 31 extending in the same direction may be connected so as to be coaxially connected to each other.

Further, a plate-shaped brace joint plate 35 for joining the lower ends of a pair of brace members in the brace 32 (vertical member 321 and first diagonal member 322 in end brace 32A, pair of second diagonal member 323 in intermediate brace 32B). However, other joint structures can be adopted.

Further, in the present embodiment, the intermediate brace 32B (second brace) that serves as an intermediate stiffener is provided in the intermediate portion of the tension member 31 in the length direction, but the provision of the intermediate brace 32B is limited. It does not matter and may be omitted. For example, if the length of the tension unit 3 is short and sufficient strength can be secured, the intermediate brace can be omitted. That is, by installing the intermediate brace 32B as in the present embodiment, it is possible to form a large-span tensile unit.

Furthermore, in the above-described embodiment, a brace formed in a substantially V shape in a side view is adopted as the end brace 32A, and a brace formed in a substantially V shape in a side view is adopted as an intermediate brace 32B. However, the present invention is not limited to this, and for example, a brace formed in a substantially V shape can be applied to the end brace 32A.

Further, in the present embodiment, the suspended ceiling unit 2 is composed of a field edge receiving orthogonal member 30, a field edge receiving material 21, a field edge 22, and a metal joint thereof, but the structure is not limited to such a structure. Absent. For example, it is possible to omit the base material such as the field edge receiving orthogonal member 30 depending on the support span and the member cross-sectional performance. In this case, the tension material 31 is directly joined to the field edge receiving material 21. Can be adopted.

In addition, it is possible to replace the constituent elements in the above-described embodiment with well-known constituent elements as appropriate without departing from the spirit of the present invention.

1 Seismic ceiling structure 2 Suspended ceiling unit 3 Tensile unit 4 Suspended member 11 Superstructure 21 Field edge receiving material 22 Field edge 23 Ceiling panel (ceiling board)
30 Field edge support orthogonal material (base material joining member)
31 Tensile material 31a Intermediate end 31b Outer end 32 Brace 32a Upper end 32A End brace (1st brace)
32B middle brace (second brace)
33 Tension material connecting plate 34 1st connecting hardware 35 1st brace joint plate 36 2nd connecting hardware 37 2nd brace joint plate 38 Seismic clip 41 Seismic hanger X1 1st horizontal direction X2 2nd horizontal direction

Claims (4)

A suspended ceiling unit that is suspended and supported by the superstructure of the building frame via a suspension member,
A tension unit that is joined to the upper part of the suspended ceiling unit and bears the horizontal load of the suspended ceiling unit is provided.
The tension unit is
Tensile members that are arranged vertically and horizontally in the horizontal direction,
A first brace that restrains the end of the tension material from the building skeleton is provided.
The seismic-resistant ceiling structure is characterized in that the intersection of the tensile members extending vertically and horizontally is provided as a restraint point against a horizontal force so as to be arbitrarily set without installing another brace behind the ceiling for a certain span. .. The seismic ceiling structure according to claim 1, wherein a second brace that serves as an intermediate stiffener is provided at an intermediate portion in the length direction of the tensile material. The suspended ceiling unit has a ceiling base material and a ceiling plate, is supported in the vertical direction from the upper structure via the hanging member, and is horizontal by being tightly connected to a restraining point for a horizontal force of the tension unit. The seismic ceiling structure according to claim 1 or 2, wherein the seismic ceiling structure is supported in a direction. Any of claims 1 to 3, wherein the tension material is joined to the suspended ceiling unit by a base material joining member installed at an intersection of a member in the horizontal vertical direction and a member in the horizontal and horizontal direction. The seismic ceiling structure described in item 1.

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