JP2015030988A

JP2015030988A - Suspended ceiling structure

Info

Publication number: JP2015030988A
Application number: JP2013159094A
Authority: JP
Inventors: 記彦櫻庭; Norihiko Sakuraba
Original assignee: Shimizu Construction Co Ltd; Shimizu Corp
Current assignee: Shimizu Construction Co Ltd; Shimizu Corp
Priority date: 2013-07-31
Filing date: 2013-07-31
Publication date: 2015-02-16
Anticipated expiration: 2033-07-31
Also published as: JP6264599B2

Abstract

PROBLEM TO BE SOLVED: To provide a suspended ceiling that can securely prevent a small piece etc., from falling while having superior earthquake performance and preventing a ceiling material (ceiling panel) from breaking and falling in a case of an earthquake.SOLUTION: A suspended ceiling structure C constituted by fitting a ceiling material 6 forming a ceiling surface to a ceiling substrate 7 suspended and supported from an upper structure 3 of a building skeleton through a suspension member 4 includes: a substantially bar-like tension material 11 which is arranged below the ceiling material 6 and laterally along the ceiling surface at predetermined intervals, and also arranged by being connected and fixed by connection and fixation means from below the ceiling material 6 to the ceiling material 6 and/or the ceiling substrate 7; and a fall prevention member 26 which is arranged while supported by the tension member 11 to cover the ceiling surface between adjacent tension materials 11.

Description

本発明は、吊り天井の構造に関する。 The present invention relates to a suspended ceiling structure.

従来、例えば学校、病院、生産施設、体育館、プール、空港ターミナルビル、オフィスビル、劇場、シネコン等の建物の天井として、吊り天井が多用されている（例えば、特許文献１、特許文献２参照）。そして、吊り天井（吊り天井構造）Ａには、例えば図４に示すように、水平の一方向Ｔ１に所定の間隔をあけて並設される複数の野縁１と、野縁１に直交し、水平の他方向Ｔ２に所定の間隔をあけて並設され、複数の野縁１に一体に接続して設けられる複数の野縁受け２と、下端を野縁受け２に接続し、上端を上階の床材等の上部構造（建物躯体）３に固着して配設される複数の吊りボルト（吊り部材）４と、野縁１と野縁受け２からなる格子状の天井下地７（野縁１の下面）にビス留めして一体に取り付けられ、天井面（天井部５）を形成する石膏ボードなどの天井パネル（天井材）６とを備えて構成したものがある。 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). . In the suspended ceiling (suspended ceiling structure) A, for example, as shown in FIG. 4, a plurality of field edges 1 arranged in parallel at a predetermined interval in a horizontal direction T <b> 1, and perpendicular to the field edge 1. , A plurality of field receivers 2 that are provided in parallel in the other direction T2 in the horizontal direction and are integrally connected to a plurality of field edges 1, a lower end is connected to the field receiver 2, and an upper end is A plurality of suspension bolts (suspending members) 4 fixedly disposed on an upper structure (building frame) 3 such as a flooring material on the upper floor, and a grid-like ceiling base 7 including a field edge 1 and a field edge receiver 2 ( There are some which are provided with a ceiling panel (ceiling material) 6 such as a gypsum board which is integrally attached by screwing to the lower surface of the field edge 1 and forms a ceiling surface (ceiling part 5).

また、例えば図５に示すように、クリーンルームのようにファンフィルターユニット等の大重量の設備機器を天井部５に設置する必要がある吊り天井（吊り天井構造）Ａには、水平の一方向Ｔ１に所定の間隔をあけて並設され、一方向Ｔ１に直交する他方向Ｔ２に延びる複数のＴバー（断面逆Ｔ型の支持部材）８と、上端を上部構造に固着し、下端側をＴバー８に接続して配設された複数の吊りボルト（吊り部材）４と、Ｔバー８などからなる天井下地７にビス留めして一体に取り付けられて天井面（天井部５）を形成する天井パネル（天井材）６とを備えて構成したものもある。 Further, as shown in FIG. 5, 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 5 as in a clean room has a horizontal direction T1. A plurality of T bars (supporting members having a reverse T-shaped cross section) 8 which are arranged in parallel with each other at a predetermined interval and extend in the other direction T2 orthogonal to one direction T1, and the upper end is fixed to the upper structure, and the lower end side is set to T A plurality of suspension bolts (suspension members) 4 connected to the bar 8 and a ceiling base 7 made of a T bar 8 or the like are screwed together to form a ceiling surface (ceiling portion 5). There is also a configuration including a ceiling panel (ceiling material) 6.

ここで、このように野縁１及び野縁受け２や、Ｔバー８等の天井下地７と天井パネル６を吊りボルト４で吊り下げ支持してなる吊り天井Ａは、その構造上、地震時に作用する水平力によって横揺れしやすい。そして、地震時に横揺れして、天井部５の端部５ａが壁や柱、梁などの建物構成部材（建物躯体）９に衝突し、天井パネル６に破損が生じたり、脱落が生じるおそれがあった。 Here, the suspended ceiling A formed by supporting the ceiling edge 7 and the ceiling panel 6 such as the field edge 1 and the field edge receiver 2 and the T-bar 8 with the suspension bolt 4 in this way is structurally resistant to an earthquake. It is easy to roll due to the acting horizontal force. Then, when the earthquake sways, the end portion 5a of the ceiling portion 5 may collide with a building component (building frame) 9 such as a wall, a column, or a beam, and the ceiling panel 6 may be damaged or fallen off. there were.

このため、従来、上部構造３などに上端側を接続し、下端側を吊りボルト４や、野縁１、野縁受け２、Ｔバー８などの天井下地７に接続して補強ブレース１０を設け、天井下地７及び天井パネル６からなる天井部５の地震時の横揺れを抑えるようにしている（図５参照）。 For this reason, a reinforcing brace 10 is conventionally provided by connecting the upper end side to the upper structure 3 and the like, and connecting the lower end side to the ceiling base 7 such as the suspension bolt 4, the field edge 1, the field edge receiver 2, and the T-bar 8. In addition, the rolling of the ceiling portion 5 composed of the ceiling base 7 and the ceiling panel 6 during an earthquake is suppressed (see FIG. 5).

一方、補強ブレース１０による耐震補強、耐震改修を行う際には、天井裏空間Ｈに作業員が入って取付作業を行うことが必要になる。このため、天井裏空間Ｈに配設された配線、配管、エアコン等の付帯設備などによって、補強できる範囲に制限が生じ、十分に対応できないケースがある。また、天井下地７などにＪＩＳ材ではない低強度の一般材が使用され、補強後の性能が不安定で十分な改修精度を確保できないケースや、点付け溶接部などがあることで対応できないケースもある。 On the other hand, when performing seismic reinforcement and seismic retrofit by the reinforcing brace 10, it is necessary for an operator to enter the ceiling space H and perform installation work. For this reason, there is a case in which the range that can be reinforced is limited by wiring, piping, an air conditioner, or the like arranged in the ceiling space H, and cannot be adequately handled. In addition, low-strength general materials that are not JIS materials are used for the ceiling base 7, etc., and the performance after reinforcement is unstable and sufficient repair accuracy cannot be ensured, or because there are spot welds etc. There is also.

これに対し、本願の出願人は、例えば図６に示すように、天井部５の下方に且つ天井部５に沿って横方向に、例えば溝形鋼などの断面略逆Ｕ字状で略棒状の引張材１１を配設し、この引張材１１の両端部をそれぞれ建物躯体３、９に接続し、中間部を天井部５の下方から天井材６及び／又は天井下地７にタッピングビス等の接続固定手段で接続固定してなる吊り天井構造Ｂを発明し、この発明について既に特許出願（特願２０１３−０１６０１９）を行っている。 On the other hand, the applicant of the present application, for example, as shown in FIG. Tensile material 11 is provided, both ends of the tensile material 11 are connected to the building housings 3 and 9, respectively, and an intermediate portion is provided from below the ceiling portion 5 to the ceiling material 6 and / or the ceiling base 7 such as tapping screws. The suspended ceiling structure B, which is connected and fixed by the connection fixing means, was invented, and a patent application (Japanese Patent Application No. 2013-016019) has already been filed for this invention.

このように溝形鋼などの略棒状の引張材（補強用グリッド部材）１１を天井部５の下方に且つ天井部５に沿って配設してなる吊り天井構造Ｂ（グリッドサポート工法）においては、地震時に、引張材１１によって天井部５を建物躯体３、９と一体に挙動させることができ、天井部５の揺れを抑制することが可能になる。 Thus, in the suspended ceiling structure B (grid support method) in which the substantially rod-shaped tensile material (reinforcing grid member) 11 such as channel steel is arranged below the ceiling portion 5 and along the ceiling portion 5, In the event of an earthquake, the ceiling member 5 can be made to behave integrally with the building housings 3 and 9 by the tension member 11, and the shaking of the ceiling member 5 can be suppressed.

また、引張材１１の中間部をビスなどの接続固定手段を用い、天井部５の下方から天井材６及び／又は天井下地７に固定するようにしたことで、引張材１１の設置時に天井裏空間Ｈ内での作業をほとんど不要にすることが可能で、施工性を大幅に向上させることができる。 Further, the intermediate part of the tension member 11 is fixed to the ceiling member 6 and / or the ceiling base 7 from below the ceiling part 5 by using a connection fixing means such as a screw, so that when the tension member 11 is installed, the ceiling The work in the space H can be made almost unnecessary, and the workability can be greatly improved.

これにより、既設の吊り天井構造Ａに引張材１１を取り付けて耐震性能の向上を図る耐震改修を行う場合であっても、天井裏空間Ｈ内での危険作業が不要で、天井裏空間Ｈ内に設けられている付帯設備、建物躯体３とのクリアランスの関係で施工できない範囲が生じるという不都合を解消することができ、必要工期の短縮、コストの低減を図ることが可能になる。 Thus, even when the tensile material 11 is attached to the existing suspended ceiling structure A to improve the earthquake resistance, a dangerous work in the ceiling space H is unnecessary, and the inside of the ceiling space H is not required. The inconvenience that there is a range in which construction cannot be performed due to the clearance with the incidental equipment provided in the building and the building housing 3 can be solved, and the required construction period can be shortened and the cost can be reduced.

また、耐震改修後もエアコン、照明などの天井部付帯設備のメンテナンスを容易に行なうことができる。さらに、天井下地７の野縁１、野縁受け２、Ｔバー８などにＪＩＳ材と一般材のどちらが使用されていても、また、新設、既設の吊り天井構造であっても、さらに天井材６がいかなる材質であっても対応可能で、確実に耐震性能の向上を図ることが可能になる。 In addition, maintenance of ceiling-related facilities such as air conditioners and lighting can be easily performed after the earthquake-resistant repair. Furthermore, whether the JIS material or the general material is used for the field edge 1, the field edge receiver 2, the T-bar 8, etc. of the ceiling base 7, and whether it is a newly installed or existing suspended ceiling structure, the ceiling material It is possible to cope with any material 6, and it is possible to reliably improve the seismic performance.

特開２００８−１２１３７１号公報JP 2008-121371 A 特開２００５−３５０９５０号公報JP 2005-350950 A

ここで、溝形鋼等を引張材（補強用グリッド部材）として天井面に格子状に設置した吊り天井構造では、例えば隣り合う引張材の間隔（ピッチ）を９００〜２４００ｍｍ程度にしており、これにより、地震時に天井部の横揺れを防止するとともに、天井パネルの落下を防止できるようにしている。 Here, in the suspended ceiling structure in which channel steel or the like is used as a tensile material (grid member for reinforcement) in a lattice shape on the ceiling surface, for example, the interval (pitch) between adjacent tensile materials is about 900 to 2400 mm. Therefore, it is possible to prevent the ceiling panel from rolling and to prevent the ceiling panel from falling during an earthquake.

しかしながら、このような引張材を設置して耐震性能を向上させた吊り天井構造は、天井材がある程度の大きさをもって連続していることを前提としており、例えば直貼岩綿吸音板等の小さな天井材を多数設置して天井面を形成した場合、このような小さな天井材を地震時に格子状の引張材で保持できずに脱落が生じるおそれがある。さらに、天井材の大小にかかわらず、地震時に天井材に破損が生じた際に、小片が脱落するおそれがある。 However, the suspended ceiling structure in which such a tensile material is installed to improve the earthquake resistance performance is based on the assumption that the ceiling material is continuous with a certain size. When a ceiling surface is formed by installing a large number of ceiling materials, such a small ceiling material cannot be held by a lattice-like tensile material at the time of an earthquake and may fall off. Furthermore, regardless of the size of the ceiling material, when the ceiling material is damaged during an earthquake, the small piece may fall off.

本発明は、上記事情に鑑み、優れた耐震性能を備えて地震時に天井材（天井パネル）の破損や脱落が生じることを防止しつつ、小片等の脱落をも確実に防止することを可能にした吊り天井構造を提供することを目的とする。 In view of the above circumstances, the present invention has excellent seismic performance and can prevent the breakage or dropout of a ceiling material (ceiling panel) during an earthquake, and also reliably prevent the fallout of small pieces and the like. An object of the present invention is to provide a suspended ceiling structure.

上記の目的を達するために、この発明は以下の手段を提供している。 In order to achieve the above object, the present invention provides the following means.

本発明の吊り天井構造は、吊り部材を介して建物躯体の上部構造に吊り下げ支持される天井下地に、天井面を形成する天井材を取り付けてなる吊り天井構造において、前記天井材の下方に且つ前記天井面に沿って横方向に所定の間隔をあけて配設されるとともに、前記天井材の下方から前記天井材及び／又は前記天井下地に接続固定手段で接続固定して配設される略棒状の引張材と、前記引張材で支持しつつ隣り合う引張材の間の前記天井面を被覆するように配設された脱落防止部材とを備えて構成されていることを特徴とする。 The suspended ceiling structure of the present invention is a suspended ceiling structure in which a ceiling material that forms a ceiling surface is attached to a ceiling base that is suspended and supported by an upper structure of a building frame via a suspension member. In addition, it is arranged at a predetermined interval in the lateral direction along the ceiling surface, and is connected and fixed to the ceiling material and / or the ceiling base from below the ceiling material by connection fixing means. A substantially rod-shaped tension member and a drop-off preventing member disposed so as to cover the ceiling surface between adjacent tension members while being supported by the tension member are characterized by being configured.

また、本発明の吊り天井構造においては、前記引張材と前記天井材の間に挟持されて前記脱落防止部材が支持されていることが望ましい。 In the suspended ceiling structure of the present invention, it is desirable that the drop-off preventing member is supported by being sandwiched between the tension member and the ceiling member.

さらに、本発明の吊り天井構造においては、前記脱落防止部材が、網目状あるいは格子状の部材であることがより望ましい。 Furthermore, in the suspended ceiling structure of the present invention, it is more desirable that the drop-off prevention member is a mesh-like or lattice-like member.

本発明の吊り天井構造においては、まず、天井下地と天井材からなる天井部に引張材を設置することにより、地震時に作用する水平力を引張材で受け、天井部の横揺れを抑止することが可能になる。 In the suspended ceiling structure of the present invention, first, by installing a tensile material on the ceiling part composed of the ceiling base and the ceiling material, the horizontal force acting during an earthquake is received by the tensile material, and the rolling of the ceiling part is suppressed. Is possible.

また、引張材の中間部をビスなどの接続固定手段を用い、天井部の下方から天井材及び／又は天井下地に固定するようにしているため、引張材の設置時に天井裏空間内での作業が不要（ほぼ不要）にすることができ、施工性を大幅に向上させることが可能になる。 In addition, since the middle part of the tensile material is fixed to the ceiling material and / or the ceiling base from below the ceiling using connection fixing means such as screws, work in the space behind the ceiling when installing the tensile material Can be made unnecessary (almost unnecessary), and the workability can be greatly improved.

これにより、既設の吊り天井構造に引張材を取り付けて耐震性能の向上を図る耐震改修を行う場合であっても、天井裏空間内での危険作業が不要で、天井裏空間内に設けられている付帯設備、建物躯体とのクリアランスの関係で施工できない範囲が生じるという不都合を解消することができ、必要工期の短縮、コストの低減を図ることが可能になる。 As a result, even when a tensile material is attached to an existing suspended ceiling structure to improve the earthquake resistance performance, dangerous work in the ceiling space is unnecessary, and it is installed in the ceiling space. It is possible to eliminate the inconvenience that there is a range in which construction cannot be performed due to the clearance with the attached facilities and the building frame, and it is possible to shorten the required construction period and reduce the cost.

また、耐震改修後もエアコン、照明などの天井部付帯設備のメンテナンスを容易に行なうことができる。さらに、天井下地の野縁、野縁受け、ＴバーなどにＪＩＳ材と一般材のどちらが使用されていても、新設、既設の吊り天井構造であっても、天井材がいかなる材質であっても対応可能で、耐震性能の向上を図ることが可能になる。 In addition, maintenance of ceiling-related facilities such as air conditioners and lighting can be easily performed after the earthquake-resistant repair. In addition, regardless of whether JIS materials or general materials are used for the field edge, field edge receiver, T-bar, etc. of the ceiling base, whether it is a new or existing suspended ceiling structure, the ceiling material can be of any material It is possible to improve the seismic performance.

さらに、本発明の吊り天井構造においては、このように天井部に引張材を設置するとともに、引張材で支持しつつ隣り合う引張材の間の天井面を被覆するように脱落防止部材を設置することにより、例えば直貼岩綿吸音板等の小さな天井材を多数設置して天井面を形成し、このような小さな天井材が隣り合う引張材の間に配設されて地震時に脱落した場合であっても、脱落防止部材でこれを受け止めることができる。また、天井材の大小にかかわらず、地震時に天井材に破損が生じた際に、この小片を脱落防止部材で受け止めることができる。 Furthermore, in the suspended ceiling structure of the present invention, the tension member is installed on the ceiling in this way, and the drop-off prevention member is installed so as to cover the ceiling surface between adjacent tensile members while being supported by the tension member. For example, when a large number of small ceiling materials such as directly-attached rock wool sound absorbing boards are installed to form a ceiling surface, such small ceiling materials are arranged between adjacent tensile materials and fall off during an earthquake. Even if it exists, this can be received by the drop-off preventing member. Moreover, regardless of the size of the ceiling material, when the ceiling material is damaged during an earthquake, the small piece can be received by the drop-off preventing member.

これにより、隣り合う引張材の間に脱落防止部材を設けることで、地震に伴い天井下に部材や小片などが脱落することを確実に防止できる。 Thereby, by providing a drop-off prevention member between adjacent tensile members, it is possible to reliably prevent a member, a small piece, or the like from dropping off under the ceiling due to an earthquake.

また、本発明の吊り天井構造においては、引張材と天井材の間に挟持して脱落防止部材を支持するようにすると、引張材を天井部に設置するとともに天井材の間に挟持させるようにして脱落防止部材を設置することができる。これにより、脱落防止部材を追加して構成した場合であっても、効率的にその設置作業を行うことができ、施工性の低下を招くことなく脱落防止部材を設置することが可能になる。 Further, in the suspended ceiling structure of the present invention, if the fall prevention member is supported by being sandwiched between the tension member and the ceiling member, the tension member is installed on the ceiling portion and is sandwiched between the ceiling members. A drop-off prevention member can be installed. Thereby, even if it is a case where it comprises and comprised a drop-off prevention member, the installation operation | work can be performed efficiently and it becomes possible to install a drop-off prevention member, without causing the fall of workability.

さらに、本発明の吊り天井構造においては、脱落防止部材が、例えばネットやワイヤメッシュ、ＦＲＰグリッド等の網目状あるいは格子状の部材であることにより、網目、格子目の大きさを適宜設定し、所望の大きさの小片等の脱落を防止することができる。また、網目、格子目を通じて天井面を露出させることができ、デザインの自由度を高めることが可能になる。 Furthermore, in the suspended ceiling structure of the present invention, the drop-off prevention member is a mesh-like or grid-like member such as a net, wire mesh, FRP grid, etc., so that the size of the mesh, grid is appropriately set, It is possible to prevent a piece having a desired size from falling off. In addition, the ceiling surface can be exposed through the meshes and lattices, and the degree of freedom in design can be increased.

本発明の一実施形態に係る吊り天井構造を示す天井面側から見た分解斜視図である。It is the disassembled perspective view seen from the ceiling surface side which shows the suspended ceiling structure which concerns on one Embodiment of this invention. 本発明の一実施形態に係る吊り天井構造を示す側断面図である。It is a sectional side view which shows the suspended ceiling structure which concerns on one Embodiment of this invention. 本発明の一実施形態に係る吊り天井構造の引張材を示す斜視図である。It is a perspective view which shows the tension | pulling material of the suspended ceiling structure which concerns on one Embodiment of this invention. 従来の吊り天井構造を示す天井面側から見た斜視図である。It is the perspective view seen from the ceiling surface side which shows the conventional suspension ceiling structure. 従来の吊り天井構造を示す天井裏側から見た斜視図である。It is the perspective view seen from the ceiling back side which shows the conventional suspended ceiling structure. 天井部に引張材を設置してなる吊り天井構造を示す天井面側から見た斜視図である。It is the perspective view seen from the ceiling surface side which shows the suspended ceiling structure which installs a tension material in a ceiling part.

以下、図１から図３（図４から図６）を参照し、本発明の一実施形態に係る吊り天井構造について説明する。ここで、本実施形態は、例えば学校、病院、生産施設、体育館、プール、空港ターミナルビル、オフィスビル、劇場、シネコン等の建物の天井として用いられる吊り天井の構造及び既設の吊り天井構造の耐震改修方法に関するものである。 Hereinafter, a suspended ceiling structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 (FIGS. 4 to 6). Here, the present embodiment is, for example, a structure of a suspended ceiling used as a ceiling of a building such as a school, a hospital, a production facility, a gymnasium, a pool, an airport terminal building, an office building, a theater, a cine-con, and an earthquake-resistant structure of an existing suspended ceiling structure. It is about repair method.

本実施形態の吊り天井（吊り天井構造）Ｃは、図１及び図２に示すように、野縁１と野縁受け２と吊り部材（吊りボルト）４と天井材６とを備えて構成されている。 A suspended ceiling (suspended ceiling structure) C according to the present embodiment includes a field edge 1, a field edge receiver 2, a suspension member (suspension bolt) 4, and a ceiling material 6, as shown in FIGS. ing.

野縁１は、例えば断面コ字状に形成された溝形鋼であり、水平に延設され、且つ水平の一方向の横方向Ｔ１に所定の間隔をあけ、平行に複数配設されている。 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. .

野縁受け２は、例えば断面コ字状に形成された溝形鋼であり、水平に延設され、且つ水平の他方向の横方向Ｔ２に所定の間隔をあけ、平行に複数配設されている。また、このとき、野縁受け２は、野縁１と交差するように配設されるとともに、複数の野縁１上に載置した状態で配設される。そして、各野縁受け２は、野縁１と交差する部分で、野縁接続用金具（クリップ）１２を使用することにより野縁１に接続されている。 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 field edge connection fitting (clip) 12 at a portion intersecting the field edge 1.

吊り部材４は、円柱棒状に形成されるとともに外周面に雄ネジの螺刻を有する吊りボルトであり、上端を上階の床材等の上部構造３（建物躯体）に固着、または鋼製の根太等に緊結して垂下され、下端側を、吊り部材接続用金具（ハンガー）１３を用いることにより野縁受け２に接続して複数配設されている。また、複数の吊り部材４は、所定の間隔をあけて分散配置されている。 The suspension member 4 is a suspension bolt that is formed in a cylindrical bar shape and has an external thread threaded on its outer peripheral surface, and its upper end is fixed to an upper structure 3 (building frame) such as an upper floor or is made of steel. A plurality of lower ends are connected and connected to the field edge receiver 2 by using a hanging member connecting metal fitting (hanger) 13. Further, the plurality of suspension members 4 are dispersedly arranged at a predetermined interval.

天井材（天井パネル）６は、２枚のボードを貼り付けて一体に積層形成したものであり、例えば天井付帯設備等の重量と併せて、１ｍ^２あたり２０ｋｇ程度の重量で形成されている。そして、この天井材６は、複数の野縁１の下面にビス留めなどして設置されている。なお、天井材６は、１枚および３枚以上のボードで構成されていてもよい。 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.

そして、この吊り天井Ｃでは、吊り部材４を介して建物の上部構造３に、野縁１と野縁受け２と天井材６とが吊り下げ支持されている。また、野縁１と野縁受け２によって天井下地７が形成され、この天井下地７と天井下地７に取り付けた天井材６によって天井部５、この天井部５によって下階の天井面がそれぞれ形成されている。 In the suspended ceiling C, 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 7 is formed by the field edge 1 and the field edge receiver 2, and the ceiling part 5 is formed by the ceiling base 7 and the ceiling material 6 attached to the ceiling base 7, and the ceiling surface of the lower floor is formed by the ceiling part 5, respectively. Has been.

一方、本実施形態の吊り天井Ｃにおいては、図１に示すように、天井部５と建物の上部構造３の間の天井裏空間Ｈの天井部５の外周端部５ａ側、すなわち、天井裏空間Ｈの壁、柱、梁等の建物構成部材（建物躯体）９側に、上端を上部構造３に接続して、束材１５が上下方向Ｔ３に延設（垂設）されている。また、この束材１５は、天井部５の外周端部５ａに沿う方向に所定の間隔をあけて複数設けられている。そして、これら複数の束材１５の下端に横方向Ｔ１、Ｔ２に延びる連結材１６が接続され、この連結材１６を介して複数の束材１５が一体に連結されている。なお、本実施形態では、これら束材１５や連結材１６として、例えばＨ形鋼、Ｉ形鋼、溝形鋼などの形鋼や角鋼管などの管材が使用されている。 On the other hand, in the suspended ceiling C of the present embodiment, as shown in FIG. 1, the outer peripheral end 5a side of the ceiling portion 5 of the ceiling space H between the ceiling portion 5 and the upper structure 3 of the building, that is, the ceiling back On the side of a building component (building frame) 9 such as a wall, a pillar, or a beam of the space H, an upper end is connected to the upper structure 3 and a bundle 15 is extended (hangs down) in the vertical direction T3. A plurality of the bundle members 15 are provided at predetermined intervals in the direction along the outer peripheral end portion 5 a of the ceiling portion 5. And the connection material 16 extended in the horizontal direction T1 and T2 is connected to the lower end of these some bundle material 15, and the some bundle material 15 is integrally connected via this connection material 16. FIG. In the present embodiment, as the bundle member 15 and the connecting member 16, for example, a shape member such as an H-shaped steel, an I-shaped steel, a grooved steel, or a tube material such as a square steel pipe is used.

また、本実施形態の吊り天井Ｃにおいては、図１及び図２に示すように、天井部５の下方に、且つ天井部５の下面（天井面）に沿って水平に、断面略逆Ｕ字状で略棒状の引張材（補強用グリッド部材）１１（１１ａ、１１ｂ）が配設されている。さらに、この引張材１１は、例えばアルミ押出形鋼、スチール部材などであり、一端部及び他端部を連結材１６に接続し、連結材１６を介して束材１５に接続して設けられている。 Moreover, in the suspended ceiling C of this embodiment, as shown in FIG.1 and FIG.2, the cross section is substantially reverse U character below the ceiling part 5, and horizontally along the lower surface (ceiling surface) of the ceiling part 5. A substantially rod-like tensile material (reinforcing grid member) 11 (11a, 11b) is disposed. Further, the tension member 11 is, for example, an aluminum extruded shape steel, a steel member, and the like. The one end and the other end are connected to the connecting member 16 and are connected to the bundle member 15 via the connecting member 16. Yes.

すなわち、本実施形態の引張材１１は、束材１５や連結材１６の支持体を介して建物躯体３、９に接続されている。さらに、引張材１１は、その中間部を天井部５の下方からタッピングビスなどの接続固定手段１７で天井材６（天井部５）及び野縁１に固定して設けられている。そして、本実施形態では、このような引張材１１が天井部５の下方で例えば９００〜２４００ｍｍピッチの格子状に配設されている。なお、引張材１１は、一端部及び／又は他端部を、取付具を用いて壁や柱、梁などの建物構成部材９に接続するようにしてもよい（建物躯体に直接的に接続するようにしてもよい）。 That is, the tension member 11 of this embodiment is connected to the building frames 3 and 9 via the support members of the bundle member 15 and the connecting member 16. Further, the tension member 11 is provided with its intermediate portion fixed to the ceiling member 6 (ceiling portion 5) and the field edge 1 from below the ceiling portion 5 by connection fixing means 17 such as a tapping screw. And in this embodiment, such a tension material 11 is arrange | positioned under the ceiling part 5 at the grid | lattice form of a pitch of 900-2400 mm, for example. In addition, you may make it connect the tension | tensile_strength material 11 to the building structural members 9, such as a wall, a pillar, and a beam, using a fixture (it connects directly to a building frame). You may do it).

また、本実施形態の吊り天井Ｃでは、図３に示すように、各引張材１１（１１ａ、１１ｂ）が、帯状の平板状に形成され、板面を上下方向Ｔ３に向けて配設される固定板部２１と、帯状の平板状に形成され、板面を横方向Ｔ１、Ｔ２に向け、固定板部２１の延設方向に沿って配設されるとともに、その上端を固定板部２１の下面に繋げて一体に形成された桁板部２２とを備えて構成されている。また、この引張材１１は、２つの桁板部２２を備え、これら桁板部２２が固定板部２１の幅方向中央を境に幅方向両側にそれぞれ所定の間隔をあけて並設されて、断面略逆Ｕ字状で略棒状に形成されている。 Moreover, in the suspended ceiling C of this embodiment, as shown in FIG. 3, each tension | tensile_strength material 11 (11a, 11b) is formed in strip | belt-shaped flat plate shape, and is arrange | positioned toward the up-down direction T3. The fixed plate portion 21 is formed in a belt-like flat plate shape, and is disposed along the extending direction of the fixed plate portion 21 with the plate surface directed in the lateral directions T1 and T2, and the upper end of the fixed plate portion 21 A girder plate portion 22 formed integrally with the lower surface is provided. The tension member 11 includes two girder plate portions 22, and these girder plate portions 22 are arranged in parallel at predetermined intervals on both sides in the width direction with respect to the width direction center of the fixed plate portion 21. It is formed in a substantially bar shape with a substantially inverted U-shaped cross section.

さらに、天井部５の下方に格子状に配設した際に、横方向の一方向Ｔ１に配設される一方の引張材１１ａは、上端から下方に凹む上側切欠部２３を備え、所定位置の固定板部２１を部分的に除去した状態で形成されている。また、一方向Ｔ１に直交する他方向Ｔ２に配設される他方の引張材１１ｂは、下端から上方に凹む下側切欠部２４を備え、所定位置の２つの桁板部２２を部分的に除去した状態で形成されている。 Furthermore, when arranged in a grid pattern below the ceiling 5, one tensile material 11 a disposed in one lateral direction T 1 includes an upper notch 23 that is recessed downward from the upper end, and is provided at a predetermined position. The fixing plate portion 21 is formed in a partially removed state. The other tension member 11b disposed in the other direction T2 orthogonal to the one direction T1 includes a lower notch portion 24 that is recessed upward from the lower end, and partially removes the two girder plate portions 22 at predetermined positions. It is formed in the state.

このように形成した一方の引張材１１ａと他方の引張材１１ｂは、これら一方の引張材１１ａと他方の引張材１１ｂの交差部２５で、上側切欠部２３に他方の引張材１１ｂを、下側切欠部２４に一方の引張材１１ａをそれぞれ嵌め合わせるようにして格子状に配設されている。また、このとき、各引張材１１は、天井部５の下方からビスなどの接続固定手段１７で固定板部２１を天井材６に、あるいは天井材６及び野縁１に固定して配設されている。 One tensile member 11a and the other tensile member 11b formed in this way are crossed portions 25 of the one tensile member 11a and the other tensile member 11b, and the other tensile member 11b is placed on the upper notch 23 and the lower side. One tensile member 11a is fitted in the notch 24 and arranged in a grid. Further, at this time, each tension member 11 is disposed from below the ceiling portion 5 by fixing the fixing plate portion 21 to the ceiling material 6 or the ceiling material 6 and the field edge 1 by connection fixing means 17 such as screws. ing.

そして、上記構成からなる本実施形態の吊り天井Ｃにおいては、天井部５の下方に配設された引張材１１が、一端部及び他端部を束材１５（取付具）を介して建物躯体の上部構造３や建物構成部材９に接続し、中間部を天井材６や野縁１に接続して配設されているため、地震時に、この引張材１１によって天井部５が建物躯体３、９と一体に挙動し、天井部５の揺れが抑制される。 And in the suspended ceiling C of this embodiment which consists of the said structure, the tension | tensile_strength material 11 arrange | positioned under the ceiling part 5 has one end part and the other end part through a bundle material 15 (attachment tool), and a building frame. Are connected to the ceiling member 6 and the field edge 1 so that the ceiling portion 5 is attached to the building housing 3 by the tension material 11 in the event of an earthquake. 9, and the shaking of the ceiling portion 5 is suppressed.

また、このとき、一方の引張材１１ａと他方の引張材１１ｂの交差部２５で、上側切欠部２３に他方の引張材１１ｂを、下側切欠部２４に一方の引張材１１ａをそれぞれ嵌め合わせ、一方の引張材１１ａと他方の引張材１１ｂを交差部２５で組み付けて配設するようにしているため、地震時に各引張材１１で確実に引張力が伝達され、天井部５の揺れが抑制される。 At this time, at the intersection 25 of one tensile material 11a and the other tensile material 11b, the other tensile material 11b is fitted to the upper notch 23, and the one tensile material 11a is fitted to the lower notch 24, respectively. Since one tensile member 11a and the other tensile member 11b are assembled and arranged at the intersection 25, the tensile force is reliably transmitted by each tensile member 11 at the time of an earthquake, and the shaking of the ceiling portion 5 is suppressed. The

一方、本実施形態の吊り天井Ｃにおいては、図１及び図２に示すように、格子状に配設された引張材１１と天井面（天井材６、天井部５）の間に、天井面の略全面を覆うようにして脱落防止部材２６が介設されている。 On the other hand, in the suspended ceiling C of the present embodiment, as shown in FIGS. 1 and 2, a ceiling surface is provided between the tension material 11 and the ceiling surface (ceiling material 6, ceiling portion 5) arranged in a lattice shape. A drop-off prevention member 26 is interposed so as to cover substantially the entire surface.

具体的に、本実施形態において、この脱落防止部材２６は、例えばネット、メッシュ、ＦＲＰグリッド等の網目状、格子状に形成されたものであり、引張材１１を天井部５に取り付ける際に、引張材１１と天井部５の間に挟持させるようにし、引張材１１で支持されて配設されている。 Specifically, in the present embodiment, the drop-off prevention member 26 is formed in a mesh shape or a lattice shape such as a net, a mesh, or an FRP grid, and when the tension member 11 is attached to the ceiling portion 5, It is sandwiched between the tension member 11 and the ceiling portion 5 and is supported and disposed by the tension member 11.

これにより、一方向Ｔ１、他方向Ｔ２に隣り合う引張材１１（１１ａ、１１ｂ）の間の天井部５、すなわち、一方向Ｔ１と他方向Ｔ２にそれぞれ延びる引張材１１（１１ａ、１１ｂ）で囲まれた方形枠内の天井部５（天井面）が、脱落防止部材２６によって覆われる。 Thereby, it is enclosed by the ceiling part 5 between the tension | tensile_strength material 11 (11a, 11b) adjacent to one direction T1 and the other direction T2, ie, the tension | tensile_strength material 11 (11a, 11b) each extended in one direction T1 and the other direction T2. The ceiling part 5 (ceiling surface) in the rectangular frame is covered with the drop-off prevention member 26.

なお、脱落防止部材２６は、必ずしも引張材１１と天井部５の間に挟持させて引張材１１に支持されていなくてもよく、隣り合う引張材１１の間の天井部５を覆うことが可能であれば、例えば直接引張材１１に固着して支持されていてもよい。
また、脱落防止部材２６は、必ずしも網目状、格子状に形成されていなくてもよい。例えば、膜状、シート状に形成されていても、繊維シートなどを樹脂で天井部５に貼設して形成されていてもよい。 The drop-off prevention member 26 does not necessarily have to be sandwiched between the tensile material 11 and the ceiling portion 5 and supported by the tensile material 11, and can cover the ceiling portion 5 between the adjacent tensile materials 11. If so, for example, it may be directly fixed to and supported by the tensile material 11.
Further, the drop-off prevention member 26 does not necessarily have to be formed in a mesh shape or a lattice shape. For example, it may be formed in a film shape or a sheet shape, or may be formed by sticking a fiber sheet or the like to the ceiling portion 5 with a resin.

そして、本実施形態の吊り天井Ｃにおいては、上記のように、天井部５に引張材１１を設置するとともに、引張材１１で支持しつつ隣り合う引張材１１の間の天井面を被覆するように脱落防止部材２６を設置することにより、例えば直貼岩綿吸音板等の小さな天井材６を多数設置して天井面を形成し、このような小さな天井材６が地震時に脱落するような場合であっても、脱落防止部材２６でこれが受け止められる。また、地震時に天井材６などに破損が生じた際、この小片が脱落防止部材２６で受け止められる。 And in the suspended ceiling C of this embodiment, while installing the tension | tensile_strength material 11 in the ceiling part 5 as mentioned above, it covers so that the ceiling surface between the adjacent tension | tensile_strength materials 11 may be covered with the tension | tensile_strength material 11. FIG. When the fall prevention member 26 is installed on the ceiling to form a ceiling surface by installing a large number of small ceiling materials 6 such as directly attached rock wool sound absorbing boards, and such small ceiling materials 6 fall off during an earthquake. Even so, the drop-off prevention member 26 receives this. Further, when the ceiling material 6 or the like is damaged during an earthquake, the small piece is received by the drop-off preventing member 26.

このため、引張材１１を設けることに加え、隣り合う引張材１１の間に脱落防止部材２６を設けることで、天井下に部材や小片などが脱落することがない。 For this reason, in addition to providing the tension member 11, by providing the drop prevention member 26 between the adjacent tension members 11, a member, a small piece, or the like does not fall under the ceiling.

したがって、本実施形態の吊り天井構造（吊り天井）Ｃにおいては、まず、天井下地７と天井材６からなる天井部５に引張材１１を設置することにより、地震時に作用する水平力を引張材１１で受け、天井部５の横揺れを抑止することが可能になる。 Therefore, in the suspended ceiling structure (suspended ceiling) C of the present embodiment, first, the tensile material 11 is installed on the ceiling portion 5 composed of the ceiling base 7 and the ceiling material 6, so that the horizontal force acting at the time of the earthquake is increased. 11, it is possible to suppress the rolling of the ceiling part 5.

また、引張材１１の中間部をビスなどの接続固定手段１７を用い、天井部５の下方から天井材６及び／又は天井下地７に固定するようにしているため、引張材１１の設置時に天井裏空間Ｈ内での作業が不要になり、施工性を大幅に向上させることが可能になる。 Further, since the intermediate portion of the tension member 11 is fixed to the ceiling member 6 and / or the ceiling base 7 from below the ceiling portion 5 using a connection fixing means 17 such as a screw, the ceiling is set when the tension member 11 is installed. The work in the back space H becomes unnecessary, and the workability can be greatly improved.

また、耐震改修後もエアコン、照明などの天井部付帯設備のメンテナンスを容易に行なうことができる。さらに、天井下地７の野縁１、野縁受け２にＪＩＳ材と一般材のどちらが使用されていても、新設、既設の吊り天井構造であっても、天井材６がいかなる材質であっても対応可能で、耐震性能の向上を図ることが可能になる。 In addition, maintenance of ceiling-related facilities such as air conditioners and lighting can be easily performed after the earthquake-resistant repair. Furthermore, regardless of whether JIS material or general material is used for the field edge 1 and field edge receiver 2 of the ceiling base 7, it may be a new or existing suspended ceiling structure, or the ceiling material 6 may be of any material. It is possible to improve the seismic performance.

また、本実施形態の吊り天井構造Ｃにおいては、このように天井部５に引張材１１を設置するとともに、引張材１１で支持しつつ隣り合う引張材１１の間の天井面を被覆するように脱落防止部材２６を設置することにより、例えば直貼岩綿吸音板等の小さな天井材６を多数設置して天井面を形成し、このような小さな天井材６が隣り合う引張材１１の間に配設されて地震時に脱落した場合であっても、脱落防止部材２６でこれを受け止めることができる。また、天井材６の大小にかかわらず、地震時に天井材６に破損が生じた際に、この小片を脱落防止部材２６で受け止めることができる。 Moreover, in the suspended ceiling structure C of this embodiment, while installing the tension | tensile_strength material 11 in the ceiling part 5 in this way, covering the ceiling surface between the adjacent tension | tensile_strength materials 11 while supporting with the tension | tensile_strength material 11. FIG. By installing the drop-off prevention member 26, for example, a large number of small ceiling members 6 such as directly attached rock wool sound absorbing plates are installed to form a ceiling surface, and such small ceiling members 6 are placed between adjacent tensile members 11. Even if it is disposed and dropped out during an earthquake, the dropout prevention member 26 can catch this. Regardless of the size of the ceiling material 6, when the ceiling material 6 is damaged during an earthquake, the small piece can be received by the drop-off preventing member 26.

これにより、隣り合う引張材１１の間に脱落防止部材２６を設けることで、地震に伴い天井下に部材や小片などが脱落することを確実に防止できる。 Thereby, by providing the drop-off preventing member 26 between the adjacent tensile members 11, it is possible to reliably prevent a member, a small piece, or the like from dropping off under the ceiling due to an earthquake.

さらに、本実施形態の吊り天井構造Ｃにおいては、引張材１１と天井材６の間に挟持して脱落防止部材２６を支持するようにすると、引張材１１を天井部５に設置するとともに天井材６の間に挟持させるようにして脱落防止部材２６を設置することができる。これにより、脱落防止部材２６を追加して構成した場合であっても、効率的にその設置作業を行うことが可能になる。すなわち、施工性の低下を招くことなく、脱落防止部材２６を設置することが可能になる。 Furthermore, in the suspended ceiling structure C of the present embodiment, when the support member 26 is supported by being sandwiched between the tension member 11 and the ceiling member 6, the tension member 11 is installed on the ceiling portion 5 and the ceiling member. The drop-off prevention member 26 can be installed so as to be sandwiched between the two. Thereby, even if it is a case where it comprises by adding the fall prevention member 26, it becomes possible to perform the installation operation | work efficiently. That is, the drop-off preventing member 26 can be installed without causing deterioration in workability.

また、脱落防止部材２６が、例えばネットやワイヤメッシュ、ＦＲＰグリッド等の網目状あるいは格子状の部材であることにより、網目、格子目の大きさを適宜設定し、所望の大きさの小片等の脱落を防止することができる。また、天井面を露出させることができ、デザインの自由度を高めることが可能になる。 Further, the drop-off prevention member 26 is a mesh-like or grid-like member such as a net, wire mesh, FRP grid, etc., so that the size of the mesh, the grid is appropriately set, and a small piece of a desired size, etc. Dropout can be prevented. In addition, the ceiling surface can be exposed, and the degree of freedom in design can be increased.

以上、本発明に係る吊り天井構造の一実施形態について説明したが、本発明は上記の一実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。 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.

例えば、本実施形態では、引張材１１が帯状で平板状の固定板部２１と固定板部２１の下面に一体形成した桁板部２２とを備えて略棒状に形成され、このように形成した一方の引張材１１ａと他方の引張材１１ｂを格子状に配設して吊り天井構造Ｃが構成されているものとした。
これに対し、鋼板、炭素繊維シートなどの板状部材（棒状部材）など、他の略棒状の引張材１１を用いて吊り天井構造Ｃを構成するようにしてもよい。また、棒状（板状）の引張材１１と帯状（テープ状）の引張材１１を組み合わせるなどして吊り天井構造Ｃを構成するようにしてもよい。 For example, in this embodiment, the tension member 11 is formed in a substantially rod shape with a belt-like flat plate-like fixing plate portion 21 and a girder plate portion 22 integrally formed on the lower surface of the fixing plate portion 21, and thus formed. The suspended ceiling structure C is configured by arranging one tensile member 11a and the other tensile member 11b in a lattice shape.
On the other hand, you may make it comprise the suspended ceiling structure C using other substantially rod-shaped tension | tensile_strength materials 11, such as plate-shaped members (bar-shaped member), such as a steel plate and a carbon fiber sheet. Further, the suspended ceiling structure C may be configured by combining the rod-shaped (plate-shaped) tensile material 11 and the belt-shaped (tape-shaped) tensile material 11.

また、本実施形態では、天井下地７が野縁１と野縁受け２を備えて構成されているものとしたが、本発明に係る天井下地は、必ずしも本実施形態のように限定しなくてもよく、例えば、吊りボルト（吊り部材）４に吊り下げ支持されて水平の一方向Ｔ１に所定の間隔をあけて並設されるとともに一方向Ｔ１に直交する他方向Ｔ２に延びる複数のＴバー（断面逆Ｔ型の支持部材）８を備えて構成した天井下地７であってもよい。すなわち、本発明は、特に天井下地の構成を限定する必要はない。 Further, in the present embodiment, the ceiling foundation 7 is configured to include the field edge 1 and the field edge receiver 2, but the ceiling foundation according to the present invention is not necessarily limited to the present embodiment. For example, a plurality of T bars that are suspended and supported by the suspension bolts (suspending members) 4 and arranged in parallel in one horizontal direction T1 at a predetermined interval and extend in the other direction T2 orthogonal to the one direction T1. It may be a ceiling base 7 configured with a (cross-section inverted T-shaped support member) 8. That is, the present invention does not need to limit the configuration of the ceiling foundation.

１野縁
２野縁受け
３上部構造（建物躯体）
４吊り部材（吊りボルト）
５天井部
５ａ端部
６天井材（天井パネル）
７天井下地
８Ｔバー
９建物構成部材（建物躯体）
１０補強ブレース
１１引張材
１１ａ一方の引張材
１１ｂ他方の引張材
１２野縁接続用金具（クリップ）
１３吊り部材接続用金具（ハンガー）
１５束材
１６連結材
１７接続固定手段
２１固定板部
２２桁板部
２３上側切欠部
２４下側切欠部
２５交差部
Ａ従来の吊り天井構造
Ｂ従来の吊り天井構造
Ｃ吊り天井構造
Ｈ天井裏空間
Ｔ１横方向（一方向）
Ｔ２横方向（他方向）
Ｔ３上下方向 1 Field edge 2 Field edge receiver 3 Superstructure (building frame)
4 Hanging members (hanging bolts)
5 Ceiling part 5a End part 6 Ceiling material (ceiling panel)
7 Ceiling base 8 T-bar 9 Building component (building frame)
DESCRIPTION OF SYMBOLS 10 Reinforcement brace 11 Tensile material 11a One tensile material 11b The other tensile material 12 Field connection fitting (clip)
13 Hanging member connection bracket (hanger)
15 Bundle material 16 Connection material 17 Connection fixing means 21 Fixing plate portion 22 Girder plate portion 23 Upper notch portion 24 Lower notch portion 25 Intersection A Conventional suspended ceiling structure B Conventional suspended ceiling structure C Suspended ceiling structure H Ceiling back space T1 lateral direction (one direction)
T2 lateral direction (other direction)
T3 vertical direction

Claims

In the suspended ceiling structure in which the ceiling material that forms the ceiling surface is attached to the ceiling base that is suspended and supported by the upper structure of the building frame via the hanging member,
It is arranged below the ceiling material and at a predetermined interval in the lateral direction along the ceiling surface, and connected and fixed to the ceiling material and / or the ceiling base from below the ceiling material by connection fixing means. A substantially rod-shaped tensile material disposed as
A suspended ceiling structure comprising: a drop-off preventing member disposed so as to cover the ceiling surface between adjacent tensile materials while being supported by the tensile material.

The suspended ceiling structure according to claim 1,
A suspended ceiling structure, wherein the drop-off preventing member is supported by being sandwiched between the tension member and the ceiling member.

The suspended ceiling structure according to claim 1 or 2,
The suspended ceiling structure, wherein the drop-off prevention member is a mesh-like or lattice-like member.