EP0603442A1 - Fire protecting assembly for suspended ceilings - Google Patents

Fire protecting assembly for suspended ceilings Download PDF

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Publication number
EP0603442A1
EP0603442A1 EP92440143A EP92440143A EP0603442A1 EP 0603442 A1 EP0603442 A1 EP 0603442A1 EP 92440143 A EP92440143 A EP 92440143A EP 92440143 A EP92440143 A EP 92440143A EP 0603442 A1 EP0603442 A1 EP 0603442A1
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EP
European Patent Office
Prior art keywords
plate
panel
panels
covering
framework
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP92440143A
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German (de)
French (fr)
Inventor
Gilbert Ponsing
Martin Fournols
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Clestra Hauserman SA
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Clestra Hauserman SA
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Publication date
Application filed by Clestra Hauserman SA filed Critical Clestra Hauserman SA
Priority to EP92440143A priority Critical patent/EP0603442A1/en
Publication of EP0603442A1 publication Critical patent/EP0603442A1/en
Withdrawn legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/001—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by provisions for heat or sound insulation
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/003—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation with movable parts, e.g. pivoting panels, access doors
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/30—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by edge details of the ceiling; e.g. securing to an adjacent wall

Definitions

  • the present invention relates to a fire protection installation for suspended ceilings of the type comprising horizontal framework elements and tilting panels facilitating access to the technical elements arranged between said suspended ceiling and the upper slab.
  • the aim is in particular to protect people from heat when a fire breaks out in the plenum defined between the false ceiling and the upper slab, the latter constituting the ceiling itself.
  • False ceilings prove to be particularly convenient to support all the technical elements and convey them in a point to another, there is the problem of confining a fire in the plenum in the event of a fire.
  • a static structure is easy to isolate, while a dynamic structure comprising a division into movable panels and framework elements requires a very specific insulation installation.
  • each panel of the LINDNER system is contiguous with at least one other panel, while crosspieces separate the panels in the false ceilings which are the subject of the invention.
  • the pivot axes of the panels are also different.
  • the axes are perpendicular to the longitudinal beams and there is the possibility of moving the tilted panels in a direction parallel to that of said beams.
  • the pivot axes of the type of false ceiling to which the invention applies are, on the contrary, preferably parallel to the axis of the longitudinal beams, although it is also possible to place them parallel to said sleepers.
  • the insulation problem to be solved is therefore very different because there is no static transverse structure on which to rely in the system of the prior art.
  • the tilting panels are simply covered with an insulating plate whose dimensions are those of the panel.
  • the vertical gaps between the panels therefore create a break in the insulating layer which cannot be filled by modifying in a way standard the configuration of the panels provided with their insulation, and that the presence of intumescent joints in said interstices is not enough to overcome.
  • the objective of the invention is therefore to provide an efficient horizontal fire barrier at a false ceiling, the arrangement of which is in particular as described in the patent filed on November 23, 1988 under No. 8815997 by the applicant .
  • These panels are tiltable to each side of the corridor and removable, by mounting on interface boxes placed at regular intervals on the support beams and cooperating with the ends of the removable crosspieces.
  • This arrangement allows easy handling of the false ceiling even after a fire.
  • the invention applies to this structure by adding a certain number of elements aimed at containing the progression of a fire, while of course retaining the functionalities already acquired with regard to the mobility of the panels.
  • Intumescent joints provide the spaces and / or gaps necessary for the relative mobility of the panels. If a fire breaks out, the volume of the joints increases so as to block the gaps. The fire barrier is therefore completely constructed.
  • each tilting panel is provided with a sheet of waterproof material placed on the internal face of the lower sheet of the panel.
  • This sheet is waterproof in order to keep the moisture of the sound and thermal insulation (for example rock wool) contained in the panel.
  • thermal insulation for example rock wool
  • the intumescent joints interposed between the outer edge of the lower face of the upper layer of the plate covering a framework element and the outer edge of the upper face of the plate covering a panel are placed on said covering plate said panel.
  • the invention also relates to a fire protection installation for the panels of the previously mentioned false ceiling arrangement, taken individually.
  • the aim is to be able to fit one or more accessories into the panels, such as lighting fixtures, fire prevention devices in the rooms, etc.
  • these accessories have a thickness greater than that of said panels, the horizontal fire barrier no longer exists.
  • an installation has therefore been developed which can be applied only to panels.
  • This installation is characterized in that it consists on the one hand of a stack of layers of thermally insulating material fixed on the insulating plate around each cavity formed in the panel to allow the embedding of an accessory, so extending said cavity to a height exceeding that of said accessory, and on the other hand, at least one horizontal plate fixed above said stack, of horizontal dimensions greater than those of the upper part of the cavity formed by the 'stacking of previous layers, so that an isolated raised housing is created for each accessory.
  • the partial cut A-A is carried out on one of the crosspieces (3) in contact with the side walls of the panel (1) perpendicular to the pivot axis.
  • FIG. 2 specifies the mounting of the fire-rated elements on the cross-member (3) and the adjoining panels (1).
  • the upper surfaces of the panels (1) and of the cross-member (3) are coated with an insulating plate or layer (4a, 4b) made of a solid material which is in the form of panels adaptable to the dimensions of the elements to be covered.
  • These plates are fire resistant and retain great dimensional stability during exposure to fire.
  • the materials chosen are, for example, compounds of calcium silicate and selected fibers which are autoclaved to obtain high stability, both chemical and dimensional, as well as low alkalinity.
  • these solid insulation panels are made from ceramics, or even using plaster ... In any case, they must be able to be worked easily with the machining tools commonly used in the field of wood, so that it can be brought to the dimensions of the panels and / or framing elements.
  • FIG. 2 shows that the insulating plate (4a) which surmounts the crosspiece (3) is of greater thickness than those (4b) which equip the upper surfaces of the tilting panels (1). This is explained by the existence of an additional layer (4c) of the same material, fixed on the plate (4a) and which must not have contact with the layers (4b), although largely exceeding both sides and d 'other of the plate (4a) so as to cover the interstices (5) existing between the tilting panels (1) and the crosspiece (3).
  • said interstices (5) are extended perpendicularly by horizontal interstices (6) which open onto the "ground" of the plenum, forming a sort of baffle at right angles.
  • Each of the branches of this baffle is equipped with an intumescent seal (7) pressed onto one or the other of the two facing walls parallel to the axis of the branch.
  • the lower sheet (8) of the tilting panel (1) is itself coated with an impermeable layer, in the form of a sheet (9) of waterproof material. This is surmounted by the flexible insulating core (10) thermally and phonically, conventionally installed in the panels (1), as well as in the crosspieces (3), in order to provide the insulation functions otherwise required for this type of false ceiling.
  • the panels (1) finally consist of an upper sheet (11) which supports the solid insulating plates (4b) of the fire barrier.
  • Figure 3 shows an example of installing a horizontal fire barrier on one of the walls to which the false ceiling is attached.
  • the layer of solid insulating plate (4a) placed on the support beam (13) positioned against the wall has a thickness greater than that of the corresponding layer (4b) of the tilting panel (1).
  • the difference between the two configurations consists in fact of adding a flexible thermal and phonic insulating layer (14) of the same type as the core (10) and which compensates for the absence of such a layer at the level of the support beam (13).
  • This layer (14) is now installed on the plate (4c).
  • the tilting panel (1) also includes a waterproof layer (9) on the internal face of the microperforated plate (8).
  • a waterproof layer (9) on the internal face of the microperforated plate (8).
  • tilting panels (1) they are produced for example using a lower sheet (8) of microperforated steel 0.8 mm thick, coated with a baked lacquer.
  • the upper sheet (11) also has a thickness of 0.8 mm and is electrogalvanized.
  • the insulating core is made of rock wool (flexible material) 45 mm thick and with a density of 40 kg / m3.
  • the whole of this core and of the two sheets which delimit the volume of the panel is for example riveted, forming a one-piece element of very great rigidity, eliminating any deformation during the opening and closing operations and guaranteeing the planimetry.
  • Figure 4 is an example, which shows a false ceiling area into which a light fixture is inserted. In this case, it suffices to add several layers of insulation (4b, 4c) so as to bypass the cavity (15) intended for the location of the luminaire. It is, in a way, the construction of a raised portion with only solid insulating material so as to create a perfectly insulating housing, with no continuity in fire protection, and without introducing a zone of weakness.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)

Abstract

1. Fire-break installation for suspended false ceilings, of the type comprising horizontal framework elements (2, 3) and panels (1) carried by this framework, at least some of these panels (1) being mounted so as to tilt about horizontal axes in order to allow access to the chamber defined between the ceiling proper and the said suspended false ceiling, characterised in that it is composed, in combination: - of plates or layers (4a, 4b, 4c) of thermally insulating material which cover the upper face of each of the said framework elements (2, 3) and, in a manner which is known, the upper face of each of the said panels (1), . the plate covering a framework element (2, 3) being formed by at least two superposed layers (4a, 4c) of the said insulating material, so that the lower face of the upper layer (4c) of this plate lies at a higher level than the upper face of the plate (4b) covering the panel (1), . the horizontal dimensions of the said upper layer (4c) being such that it extends laterally at least above the vertical space (5) separating the said panel (1) from the said neighbouring framework element (2, 3) and preferably beyond the said space (5) above a strip of the said panel (1) parallel to the said space (5), - and joints (7) made of expandable (swelling) materials, placed in each of the said vertical spaces (5) and/or interposed between the outer edge of the lower face of the said upper layer of the said plate (4c) covering a framework element (2, 3) and the outer edge of the upper face of the plate (4b) covering a panel (1). <IMAGE>

Description

La présente invention a trait à une installation coupe-feu pour plafonds suspendus du type comportant des éléments d'ossature horizontale et des panneaux basculants facilitant l'accès aux éléments techniques disposés entre ledit plafond suspendu et la dalle supérieure.The present invention relates to a fire protection installation for suspended ceilings of the type comprising horizontal framework elements and tilting panels facilitating access to the technical elements arranged between said suspended ceiling and the upper slab.

Il s'agit en fait d'assurer une barrière coupe-feu horizontale, pour répondre aux nouvelles exigences de sécurité en matière de protection contre les incendies. Le but est notamment de protéger les personnes contre la chaleur lorsqu'un feu se déclenche dans le plénum défini entre le faux-plafond et la dalle supérieure, cette dernière constituant le plafond proprement dit.This is actually to ensure a horizontal fire barrier, to meet the new safety requirements in terms of fire protection. The aim is in particular to protect people from heat when a fire breaks out in the plenum defined between the false ceiling and the upper slab, the latter constituting the ceiling itself.

Jusqu'ici, le concept de barrière coupe-feu s'appliquait essentiellement à des barrières verticales destinées à empêcher la propagation du feu d'une partie d'un bâtiment vers une autre partie, d'une pièce à l'autre, etc... particulièrement le long de couloirs et/ou par le biais d'escaliers. Cela tient notamment au fait que les plafonds suspendus ne sont pas encore très répandus et que les exigences en matière de sécurité n'étaient pas encore totalement fixées. Enfin, ceux qui existent ne servent pas forcément à véhiculer des gaines techniques, lesquelles constituent bien entendu un facteur d'accroissement important des risques d'incendie.Until now, the concept of fire barrier mainly applied to vertical barriers intended to prevent the spread of fire from one part of a building to another part, from one room to another, etc. .. particularly along corridors and / or by stairs. This is due in particular to the fact that suspended ceilings are not yet widespread and that the safety requirements were not yet fully set. Finally, those that exist do not necessarily serve to convey technical ducts, which of course constitute a significant factor in increasing the risk of fire.

Les faux plafonds s'avérant toutefois particulièrement commodes pour supporter tous les éléments techniques et les véhiculer d'un point à l'autre, se pose le problème du confinement d'un feu dans le plénum en cas d'incendie.False ceilings, however, prove to be particularly convenient to support all the technical elements and convey them in a point to another, there is the problem of confining a fire in the plenum in the event of a fire.

Les moyens techniques nécessaires à l'établissement d'une barrière destinée à freiner, voire empêcher la propagation du feu semblent à priori peu compatibles avec les moyens techniques à mettre en oeuvre pour permettre le basculement des panneaux entre les éléments d'ossature, basculement qui nécessite des jeux fonctionnels dont il faut tenir compte. Une structure statique est facile à isoler, alors qu'une structure dynamique comprenant un découpage en panneaux mobiles et éléments d'ossature nécessite une installation d'isolation très particulière.The technical means necessary to establish a barrier intended to slow down or even prevent the spread of fire seem a priori not very compatible with the technical means to be used to allow the tilting of the panels between the framework elements, tilting which requires functional games which must be taken into account. A static structure is easy to isolate, while a dynamic structure comprising a division into movable panels and framework elements requires a very specific insulation installation.

Le problème a déjà été rencontré dans l'art antérieur, mais il a été appliqué à un type de faux-plafond différent de celui que vise la présente invention. On connait une documentation technique diffusée par une société LINDNER qui commercialise en effet des faux-plafonds comportant des panneaux basculants et munis d'une isolation thermique.The problem has already been encountered in the prior art, but it has been applied to a type of false ceiling different from that aimed by the present invention. We know of technical documentation distributed by a LINDNER company which indeed markets false ceilings comprising tilting panels and provided with thermal insulation.

Cependant, au contraire du type de faux plafond visé par l'invention, celui-ci ne comporte des éléments d'ossature que suivant une unique direction. Il s'agit de poutrelles longitudinales entre lesquelles sont installés seulement lesdits panneaux.However, unlike the type of false ceiling targeted by the invention, it only includes framing elements in one direction. These are longitudinal beams between which only said panels are installed.

Par conséquent, chaque panneau du système LINDNER est contigu avec au moins un autre panneau, alors que des traverses séparent les panneaux dans les faux-plafonds objets de l'invention.Consequently, each panel of the LINDNER system is contiguous with at least one other panel, while crosspieces separate the panels in the false ceilings which are the subject of the invention.

Les axes de pivotement des panneaux sont également différents. Dans le système connu, les axes sont perpendiculaires aux poutrelles longitudinales et il y a possibilité de déplacer les panneaux basculés selon une direction parallèle à celle desdites poutrelles. Les axes de pivotement du type de faux-plafond auquel s'applique l'invention sont au contraire préférentiellement parallèles à l'axe des poutrelles longitudinales, bien qu'il soit aussi possible de les placer parallèlement auxdites traverses.The pivot axes of the panels are also different. In the known system, the axes are perpendicular to the longitudinal beams and there is the possibility of moving the tilted panels in a direction parallel to that of said beams. The pivot axes of the type of false ceiling to which the invention applies are, on the contrary, preferably parallel to the axis of the longitudinal beams, although it is also possible to place them parallel to said sleepers.

Le problème d'isolation à résoudre est donc très différent parce qu'il n'y a pas de structure transversale statique sur laquelle s'appuyer dans le système de l'art antérieur. Les panneaux basculants sont simplement recouverts d'une plaque isolante dont les dimensions sont celles du panneau. Les interstices verticaux entre les panneaux créent par conséquent une rupture dans la couche isolante qu'il n'est pas possible de combler en modifiant d'une façon standard la configuration des panneaux munis de leur isolation, et que la présence de joints intumescents dans lesdits interstices ne suffit pas à pallier.The insulation problem to be solved is therefore very different because there is no static transverse structure on which to rely in the system of the prior art. The tilting panels are simply covered with an insulating plate whose dimensions are those of the panel. The vertical gaps between the panels therefore create a break in the insulating layer which cannot be filled by modifying in a way standard the configuration of the panels provided with their insulation, and that the presence of intumescent joints in said interstices is not enough to overcome.

La présence des traverses statiques reliant les poutrelles longitudinales entre deux panneaux consécutifs modifie sensiblement les données du problème puisqu'on bénéficie d'un réseau statique bien plus important que dans le cadre du système LINDNER.The presence of the static sleepers connecting the longitudinal beams between two consecutive panels modifies the data of the problem appreciably since one benefits from a static network much more important than within the framework of the LINDNER system.

L'objectif de l'invention est donc de réaliser une barrière anti-feu horizontale efficiente au niveau d'un faux-plafond dont la disposition est notamment telle que décrite dans le brevet déposé le 23 novembre 1988 sous le N° 8815997 par la déposante.The objective of the invention is therefore to provide an efficient horizontal fire barrier at a false ceiling, the arrangement of which is in particular as described in the patent filed on November 23, 1988 under No. 8815997 by the applicant .

On rappelle que cette disposition de plafond comporte essentiellement :

  • d'une part, des éléments d'ossature, à savoir des poutrelles supports parallèles fixées ponctuellement par des suspentes à la dalle supérieure, des traverses amovibles et des organes de fixation aux murs, et
  • d'autre part, des panneaux basculants constitués principalement d'un assemblage d'une tôle inférieure, d'une âme isolant thermiquement et phoniquement et d'une tôle supérieure.
It is recalled that this ceiling arrangement essentially comprises:
  • on the one hand, framework elements, namely parallel support beams punctually fixed by lines to the upper slab, removable crossmembers and members for fixing to the walls, and
  • on the other hand, tilting panels mainly consisting of an assembly of a lower sheet, a thermally and phonically insulating core and an upper sheet.

Ces panneaux sont basculants vers chaque côté du couloir et démontables, par montage sur des boitiers interfaces placés à intervalles réguliers sur les poutrelles supports et coopérant avec les extrémités des traverses amovibles.These panels are tiltable to each side of the corridor and removable, by mounting on interface boxes placed at regular intervals on the support beams and cooperating with the ends of the removable crosspieces.

Cette disposition permet un maniement aisé du faux-plafond même après un incendie.This arrangement allows easy handling of the false ceiling even after a fire.

L'invention s'applique à cette structure par ajout d'un certain nombre d'éléments visant à contenir la progression d'un feu, en conservant bien entendu les fonctionnalités déjà acquises quant à la mobilité des panneaux.The invention applies to this structure by adding a certain number of elements aimed at containing the progression of a fire, while of course retaining the functionalities already acquired with regard to the mobility of the panels.

A cet effet, on utilise en combinaison :

  • ― des plaques ou couches de matériau isolante thermiquement recouvrant la face supérieure de chacun desdits éléments d'ossature et de façon connue la face supérieure de chacun desdits panneaux,
  • ― la plaque recouvrant un élément d'ossature étant formée d'au moins deux couches superposées dudit matériau isolant de telle manière que la face inférieure de la couche supérieure de cette plaque soit située à un niveau plus élevé que la face supérieure de la plaque recouvrant le panneau,
  • ― les dimensions horizontales de ladite couche supérieure étant telles qu'elle s'étende latéralement au moins par dessus l'espace vertical séparant ledit panneau dudit élément d'ossature voisin et de préférence au-delà dudit espace au-dessus d'une bande dudit panneau parallèle audit espace,
  • ― et des joints en matériaux intumescents placés dans chacun desdits espaces verticaux et/ou interposés entre le bord extérieur de la face inférieure de ladite couche supérieure de ladite plaque recouvrant un élément d'ossature et le bord extérieur de la face supérieure de la plaque recouvrant un panneau.
To this end, we use in combination:
  • Plates or layers of thermally insulating material covering the upper face of each of said framework elements and in known manner the upper face of each of said panels,
  • The plate covering a framework element being formed of at least two superposed layers of said insulating material so that the lower face of the upper layer of this plate is located at a higher level than the upper face of the covering plate the panel,
  • The horizontal dimensions of said upper layer being such that it extends laterally at least over the vertical space separating said panel from said neighboring framework element and preferably beyond said space above a strip of said panel parallel to said space,
  • - And seals made of intumescent materials placed in each of said vertical spaces and / or interposed between the outer edge of the lower face of said upper layer of said plate covering a framework element and the external edge of the upper face of the covering plate a sign.

Les joints intumescents ménagent les espaces et/ou interstices nécessaires à la mobilité relative des panneaux. Si un feu se déclenche, le volume des joints augmente de manière à obstruer les interstices. La barrière coupe-feu est par conséquent complètement constituée.Intumescent joints provide the spaces and / or gaps necessary for the relative mobility of the panels. If a fire breaks out, the volume of the joints increases so as to block the gaps. The fire barrier is therefore completely constructed.

L'existence et le positionnement des joints permettent en réalité les deux états fonctionnels du faux plafond :

  • barrière coupe-feu inactivée lorsque les joints ont leur volume initial. Les jeux mécaniques entre éléments du plafond sont autorisés et,
  • barrière coupe-feu activée, le gonflement des joints réalise la jonction entre les éléments horizontaux de la barrière, conduisant à un unique élément plan freinant la diffusion de la chaleur et du feu.
The existence and the positioning of the joints actually allow the two functional states of the false ceiling:
  • fire barrier inactivated when the joints have their initial volume. Mechanical clearances between ceiling elements are authorized and,
  • fire barrier activated, the swelling of the joints makes the junction between the horizontal elements of the barrier, leading to a single flat element slowing down the diffusion of heat and fire.

Afin d'améliorer encore l'isolation, chaque panneau basculant est muni d'une feuille en matériau étanche placée sur la face interne de la tôle inférieure du panneau.In order to further improve the insulation, each tilting panel is provided with a sheet of waterproof material placed on the internal face of the lower sheet of the panel.

Cette feuille est étanche en vue de garder l'humidité de l'isolant phonique et thermique (par exemple de la laine de roche) contenu dans le panneau. L'évaporation de l'eau qui ne manque pas de survenir en cas d'incendie est ainsi contenue et cela augmente l'effet refroidisseur de l'isolant.This sheet is waterproof in order to keep the moisture of the sound and thermal insulation (for example rock wool) contained in the panel. The evaporation of water which does not fail to occur in the event of a fire is thus contained and this increases the cooling effect of the insulation.

Selon une configuration possible, les joints intumescents interposés entre le bord extérieur de la face inférieure de la couche supérieure de la plaque recouvrant un élément d'ossature et le bord extérieur de la face supérieure de la plaque recouvrant un panneau sont placés sur ladite plaque recouvrant ledit panneau.According to a possible configuration, the intumescent joints interposed between the outer edge of the lower face of the upper layer of the plate covering a framework element and the outer edge of the upper face of the plate covering a panel are placed on said covering plate said panel.

Enfin, l'invention concerne également une installation coupe-feu pour les panneaux de la disposition de faux-plafond rappelée auparavant, pris individuellement.Finally, the invention also relates to a fire protection installation for the panels of the previously mentioned false ceiling arrangement, taken individually.

Le but recherché est de pouvoir encastrer dans les panneaux un ou plusieurs accessoires comme des luminaires, des dispositifs de prévention contre les incendies dans les pièces, etc. Lorsque ces accessoires ont une épaisseur supérieure à celle desdits panneaux, la barrière coupe-feu horizontale n'existe plus. Pour éviter un tel inconvénient, on a donc mis au point une installation applicable aux seuls panneaux.The aim is to be able to fit one or more accessories into the panels, such as lighting fixtures, fire prevention devices in the rooms, etc. When these accessories have a thickness greater than that of said panels, the horizontal fire barrier no longer exists. To avoid such a drawback, an installation has therefore been developed which can be applied only to panels.

Cette installation est caractérisée en ce qu'elle est constituée d'une part d'un empilement de couches de matériau isolant thermiquement fixé sur la plaque isolante autour de chaque cavité pratiquée dans le panneau pour permettre l'encastrement d'un accessoire, de manière à prolonger ladite cavité jusqu'à une hauteur excédant celle dudit accessoire, et d'autre part, d'au moins une plaque horizontale fixée au-dessus dudit empilement, de dimensions horizontales supérieures à celles de la partie supérieure de la cavité formée par l'empilement des couches précédentes, de sorte qu'un logement surélevé isolé est créé pour chaque accessoire.This installation is characterized in that it consists on the one hand of a stack of layers of thermally insulating material fixed on the insulating plate around each cavity formed in the panel to allow the embedding of an accessory, so extending said cavity to a height exceeding that of said accessory, and on the other hand, at least one horizontal plate fixed above said stack, of horizontal dimensions greater than those of the upper part of the cavity formed by the 'stacking of previous layers, so that an isolated raised housing is created for each accessory.

On va maintenant expliciter l'invention plus en détail, en se référant aux figures jointes en annexe, pour lesquelles :

  • La figure 1 représente une vue de dessus d'une configuration possible de plafond,
  • La figure 2 représente une coupe partielle A-A du plafond suspendu, muni de composants de la barrière coupe-feu selon l'invention, au niveau d'une traverse de liaison,
  • La figure 3 montre une seconde coupe partielle B-B du même plafond, avec une autre configuration de la barrière coupe-feu en bordure d'un mur, et
  • La figure 4 est encore une coupe partielle d'une zone de plafond suspendu avec un emplacement de luminaire.
We will now explain the invention in more detail, with reference to the attached figures, for which:
  • FIG. 1 represents a top view of a possible configuration of the ceiling,
  • FIG. 2 represents a partial section AA of the suspended ceiling, provided with components of the fire barrier according to the invention, at the level of a connecting cross member,
  • FIG. 3 shows a second partial section BB of the same ceiling, with another configuration of the fire barrier at the edge of a wall, and
  • Figure 4 is still a partial section of a suspended ceiling area with a fixture location.

La figure 1 schématise un exemple possible d'utilisation d'un plafond suspendu, le plus simple possible. On y retrouve les divers éléments mentionnés auparavant, à savoir :

  • les panneaux basculants (1),
  • les éléments d'ossature qui comprennent :
    • · des poutrelles supports longitudinales (2)
    • · des traverses de liaison (3).
Figure 1 shows schematically a possible example of using a suspended ceiling, the simplest possible. It contains the various elements mentioned above, namely:
  • the tilting panels (1),
  • framework elements which include:
    • · Longitudinal support beams (2)
    • · Connecting crosspieces (3).

Cette figure a pour simple objet de faire apparaître les endroits choisis pour effectuer les coupes partielles A-A et B-B. On remarque les discontinuités apparaissant aux frontières des éléments d'ossature et basculants, qui sont notamment prévues pour permettre les jeux mécaniques nécessaires au basculement des panneaux (1).The purpose of this figure is to show the places chosen to make the partial cuts AA and BB. We notice the discontinuities appearing at the borders of the framework and tilting elements, which are in particular provided to allow the mechanical clearances necessary for the tilting of the panels (1).

La coupe partielle A-A est effectuée sur une des traverses (3) au contact des parois latérales du panneau (1) perpendiculaires à l'axe de pivotement.The partial cut A-A is carried out on one of the crosspieces (3) in contact with the side walls of the panel (1) perpendicular to the pivot axis.

La figure 2 précise le montage des éléments coupe-feu sur la traverse (3) et les panneaux (1) contigus. Les surfaces supérieures des panneaux (1) et de la traverse (3) sont revêtues d'une plaque ou couche isolante (4a, 4b) réalisée en un matériau solide qui se présente sous forme de panneaux adaptables aux dimensions des éléments à recouvrir.FIG. 2 specifies the mounting of the fire-rated elements on the cross-member (3) and the adjoining panels (1). The upper surfaces of the panels (1) and of the cross-member (3) are coated with an insulating plate or layer (4a, 4b) made of a solid material which is in the form of panels adaptable to the dimensions of the elements to be covered.

Ces plaques résistent au feu et conservent une grande stabilité dimensionnelle pendant une exposition au feu. Les matériaux choisis sont par exemple des composés de silicate de calcium et de fibres sélectionnées qui sont autoclavés pour obtenir une grande stabilité, aussi bien chimique que dimensionnelle, ainsi qu'une faible alcalinité.These plates are fire resistant and retain great dimensional stability during exposure to fire. The materials chosen are, for example, compounds of calcium silicate and selected fibers which are autoclaved to obtain high stability, both chemical and dimensional, as well as low alkalinity.

Selon des variantes possibles, ces panneaux d'isolants solides sont fabriqués à partir de céramiques, ou encore à l'aide de plâtre... En tout état de cause, ils doivent pouvoir être travaillés facilement avec les outils d'usinage couramment utilisés dans le domaine du bois, de manière à pouvoir être mis aux dimensions des panneaux et/ou des éléments d'ossature.According to possible variants, these solid insulation panels are made from ceramics, or even using plaster ... In any case, they must be able to be worked easily with the machining tools commonly used in the field of wood, so that it can be brought to the dimensions of the panels and / or framing elements.

L'examen de la figure 2 montre que la plaque isolante (4a) qui surmonte la traverse (3) est d'épaisseur supérieure à celles (4b) qui équipent les surfaces supérieures des panneaux basculants (1). Cela s'explique par l'existence d'une couche supplémentaire (4c) du même matériau, fixée sur la plaque (4a) et qui ne doit pas avoir de contact avec les couches (4b), bien que dépassant largement de part et d'autre de la plaque (4a) de manière à recouvrir les interstices (5) existant entre les panneaux basculants (1) et la traverse (3).Examination of FIG. 2 shows that the insulating plate (4a) which surmounts the crosspiece (3) is of greater thickness than those (4b) which equip the upper surfaces of the tilting panels (1). This is explained by the existence of an additional layer (4c) of the same material, fixed on the plate (4a) and which must not have contact with the layers (4b), although largely exceeding both sides and d 'other of the plate (4a) so as to cover the interstices (5) existing between the tilting panels (1) and the crosspiece (3).

En coupe, lesdits interstices (5) sont prolongés perpendiculairement par des interstices (6) horizontaux qui débouchent sur le "sol" du plénum, formant une sorte de chicane à angle droit. Chacune des branches de cette chicane est équipée d'un joint intumescent (7) plaqué sur l'une ou l'autre des deux parois en regard parallèlement à l'axe de la branche.In section, said interstices (5) are extended perpendicularly by horizontal interstices (6) which open onto the "ground" of the plenum, forming a sort of baffle at right angles. Each of the branches of this baffle is equipped with an intumescent seal (7) pressed onto one or the other of the two facing walls parallel to the axis of the branch.

La tôle inférieure (8) du panneau basculant (1) est elle-même revêtue d'une couche imperméable, sous la forme d'une feuille (9) en matériau étanche. Celle-ci est surmontée de l'âme souple isolant (10) thermiquement et phoniquement, classiquement installée dans les panneaux (1), ainsi que dans les traverses (3), afin d'assurer les fonctions d'isolation par ailleurs requises pour ce type de faux plafond. Les panneaux (1) sont enfin constitués d'une tôle supérieure (11) qui supporte les plaques isolantes solides (4b) de la barrière coupe-feu.The lower sheet (8) of the tilting panel (1) is itself coated with an impermeable layer, in the form of a sheet (9) of waterproof material. This is surmounted by the flexible insulating core (10) thermally and phonically, conventionally installed in the panels (1), as well as in the crosspieces (3), in order to provide the insulation functions otherwise required for this type of false ceiling. The panels (1) finally consist of an upper sheet (11) which supports the solid insulating plates (4b) of the fire barrier.

Au niveau des rives de bordure, la configuration est un peu différente, puisqu'il y a des points de fixation aux murs. La figure 3 montre un exemple d'installation d'une barrière coupe-feu horizontale sur l'un des murs auquel est arrimé le faux plafond.At the edge banks, the configuration is a little different, since there are fixing points to the walls. Figure 3 shows an example of installing a horizontal fire barrier on one of the walls to which the false ceiling is attached.

Globalement, on retrouve des caractéristiques très similaires à ce qu'on vient de décrire : la couche d'isolant solide en plaque (4a) placée sur la poutrelle support (13) positionnée contre le mur a une épaisseur supérieure à celle de la couche correspondante (4b) du panneau basculant (1). D'où l'absence de contact avec la couche (4c) qui déborde de la plaque (4a) pour venir recouvrir l'interstice vertical (5) en ménageant un espace horizontal (6) entre les plaques (4b) et (4c).Overall, we find characteristics very similar to what we have just described: the layer of solid insulating plate (4a) placed on the support beam (13) positioned against the wall has a thickness greater than that of the corresponding layer (4b) of the tilting panel (1). Hence the absence of contact with the layer (4c) which overflows from the plate (4a) to cover the vertical gap (5) by providing a horizontal space (6) between the plates (4b) and (4c) .

Là également, on profite des deux branches de la chicane à angle droit ainsi créée pour installer des joints intumescents (7) qui courent par conséquent d'une part le long des faces latérales verticales des panneaux basculants (1) ou des éléments d'ossature (13) et d'autre part sur la surface inférieure des plaques (4c) en regard des plaques (4b) ou inversement sur la surface supérieure des plaques (4b) en regard des plaques (4c).Here too, we take advantage of the two branches of the right-angle baffle thus created to install intumescent seals (7) which therefore run on the one hand along the vertical lateral faces of the tilting panels (1) or of the framework elements. (13) and on the other hand on the lower surface of the plates (4c) facing the plates (4b) or vice versa on the upper surface of the plates (4b) facing the plates (4c).

La différence entre les deux configurations consiste en fait en l'ajout d'une couche isolante thermique et phonique souple (14) du même type que l'âme (10) et qui pallie l'absence d'une telle couche au niveau de la poutrelle support (13). Cette couche (14) est à présent installée sur la plaque (4c).The difference between the two configurations consists in fact of adding a flexible thermal and phonic insulating layer (14) of the same type as the core (10) and which compensates for the absence of such a layer at the level of the support beam (13). This layer (14) is now installed on the plate (4c).

Bien entendu, selon un mode de fabrication possible, le panneau basculant (1) comporte également une couche étanche (9) sur la face interne de la plaque microperforée (8). Parmi les matériaux possibles pour ladite feuille, on peut citer, sans que cela soit exhaustif, le polyéthylène, le papier, l'aluminium et la céramique.Of course, according to a possible manufacturing method, the tilting panel (1) also includes a waterproof layer (9) on the internal face of the microperforated plate (8). Among the possible materials for said sheet, there may be mentioned, without being exhaustive, polyethylene, paper, aluminum and ceramic.

En ce qui concerne les panneaux basculants (1), ils sont fabriqués par exemple à l'aide d'une tôle inférieure (8) en acier microperforé d'épaisseur 0,8 mm, revêtue d'une laque cuite au four. La tôle supérieure (11) a une épaisseur de 0,8 mm également et elle est électrozinguée.Regarding the tilting panels (1), they are produced for example using a lower sheet (8) of microperforated steel 0.8 mm thick, coated with a baked lacquer. The upper sheet (11) also has a thickness of 0.8 mm and is electrogalvanized.

L'âme isolante est quant à elle en laine de roche (matériau souple) de 45 mm d'épaisseur et d'une densité de 40 kg / m³. L'ensemble de cette âme et des deux tôles qui délimitent le volume du panneau est par exemple riveté, formant un élément monobloc d'une très grande rigidité, supprimant toute déformation lors des opérations d'ouverture et de fermeture et garantissant la planimétrie.The insulating core is made of rock wool (flexible material) 45 mm thick and with a density of 40 kg / m³. The whole of this core and of the two sheets which delimit the volume of the panel is for example riveted, forming a one-piece element of very great rigidity, eliminating any deformation during the opening and closing operations and guaranteeing the planimetry.

Ceci a son importance : dans les configurations basiques de ce type de plafond, c'est-à-dire sans adjonction d'un système coupe-feu, il est déjà important qu'il y ait simultanément :

  • une bonne accessibilité au plénum, permettant l'accès aux gaines techniques et
  • une isolation acoustique.
This is important: in the basic configurations of this type of ceiling, that is to say without the addition of a firebreak system, it is already important that there are simultaneously:
  • good accessibility to the plenum, allowing access to technical ducts and
  • acoustic insulation.

Il est évident que si chaque opération d'ouverture et/ou de fermeture peut provoquer des déformations des panneaux basculants (1), l'isolation phonique initialement exigée devient vite inopérante. D'où la rigueur qui y est apportée dans la conception des panneaux, usinés avec une grande précision et dont les tôles et l'âme sont sertis pour former un élément monobloc.It is obvious that if each opening and / or closing operation can cause deformation of the tilting panels (1), the sound insulation initially required quickly becomes ineffective. Hence the rigor which is brought to it in the design of the panels, machined with great precision and whose sheets and core are crimped to form a monobloc element.

Il faut souligner que cette conception initiale confère déjà aux panneaux basculants (1) une bonne résistance au feu. L'ensemble métal + laine de roche conduit par exemple à une protection codifiée MO.It should be emphasized that this initial design already gives the tilting panels (1) good fire resistance. The metal + rock wool combination leads, for example, to MO-coded protection.

La rigidité des panneaux (1), sans résoudre le problème de la réalisation d'une barrière coupe-feu horizontale, en est toutefois un préalable indispensable. En effet, des panneaux déformables seraient très préjudiciables à une structure coupe-feu, car il serait impossible d'assurer l'étanchéification par des joints intumescents, par exemple, sans préjuger d'autres problèmes dus à l'absence de planéité de ladite barrière horizontale.The rigidity of the panels (1), without solving the problem of making a horizontal fire barrier, is however a prerequisite. Indeed, deformable panels would be very detrimental to a fire-resistant structure, since it would be impossible to ensure sealing by intumescent joints, for example, without prejudging other problems due to the lack of flatness of said barrier horizontal.

C'est bien la combinaison des différents éléments décrits auparavant, rapportés sur la structure de faux plafond initiale, qui conduit à cette structure coupe-feu horizontale.It is the combination of the various elements described above, reported on the initial false ceiling structure, which leads to this horizontal fire structure.

Celle-ci s'adapte particulièrement bien à toutes sortes de configurations. La figure 4 en est un exemple, qui montre une zone de faux plafond dans laquelle est inséré un luminaire. Dans ce cas, il suffit de rajouter plusieurs couches d'isolant (4b, 4c) de manière à contourner la cavité (15) destinée à l'emplacement du luminaire. Il s'agit en quelque sorte de l'édification d'une portion surélevée avec uniquement du matériau isolant solide de façon à créer un logement parfaitement isolant, sans solution de continuité dans la protection contre l'incendie, et sans introduire une zone de faiblesse.It adapts particularly well to all kinds of configurations. Figure 4 is an example, which shows a false ceiling area into which a light fixture is inserted. In this case, it suffices to add several layers of insulation (4b, 4c) so as to bypass the cavity (15) intended for the location of the luminaire. It is, in a way, the construction of a raised portion with only solid insulating material so as to create a perfectly insulating housing, with no continuity in fire protection, and without introducing a zone of weakness.

Bien entendu, les diverses configurations décrites ci-dessus n'ont que valeur d'exemples, et ne doivent pas être considérées comme exhaustives de l'invention. Celle-ci comprend également les variantes possibles, notamment de forme et dans l'emploi des matériaux choisis.Of course, the various configurations described above are only examples, and should not be considered as exhaustive of the invention. This also includes the possible variants, in particular in form and in the use of the materials chosen.

Claims (7)

Installation coupe-feu pour faux-plafonds suspendus du type comportant des éléments d'ossature horizontale (2, 3) et des panneaux (1) portés par cette ossature, certains au moins de ces panneaux (1) étant montés basculants autour d'axes horizontaux pour permettre l'accès au plénum défini entre le plafond proprement dit et ledit faux-plafond suspendu, caractérisée en ce qu'elle se compose, en combinaison : ― de plaques ou couches (4a, 4b, 4c) de matériau isolant thermiquement recouvrant la face supérieure de chacun desdits éléments d'ossature (2, 3) et de façon connue la face supérieure de chacun desdits panneaux (1), · la plaque recouvrant un élément d'ossature (2, 3) étant formée d'au moins deux couches superposées (4a, 4c) dudit matériau isolant de telle manière que la face inférieure de la couche supérieure (4c) de cette plaque soit située à un niveau plus élevé que la face supérieure de la plaque (4b) recouvrant le panneau (1), · les dimensions horizontales de ladite couche supérieure (4c) étant telles qu'elle s'étende latéralement au moins par dessus l'espace vertical (5) séparant ledit panneau (1) dudit élément d'ossature voisin (2, 3) et de préférence au-delà dudit espace (5) au-dessus d'une bande dudit panneau (1) parallèle audit espace (5), ― et de joints (7) en matériaux intumescents placés dans chacun desdits espaces verticaux (5) et/ou interposés entre le bord extérieur de la face inférieure de ladite couche supérieure de ladite plaque (4c) recouvrant un élément d'ossature (2, 3) et le bord extérieur de la face supérieure de la plaque (4b) recouvrant un panneau (1). Firestop installation for suspended false ceilings of the type comprising horizontal framework elements (2, 3) and panels (1) carried by this framework, at least some of these panels (1) being mounted tilting about axes horizontal to allow access to the plenum defined between the ceiling proper and said suspended suspended ceiling, characterized in that it is composed, in combination: - plates or layers (4a, 4b, 4c) of thermally insulating material covering the upper face of each of said framework elements (2, 3) and in known manner the upper face of each of said panels (1), · The plate covering a framework element (2, 3) being formed of at least two superimposed layers (4a, 4c) of said insulating material so that the underside of the upper layer (4c) of this plate is located at a higher level than the upper face of the plate (4b) covering the panel (1), The horizontal dimensions of said upper layer (4c) being such that it extends laterally at least over the vertical space (5) separating said panel (1) from said neighboring framework element (2, 3) and preferably beyond said space (5) above a strip of said panel (1) parallel to said space (5), - and seals (7) made of intumescent materials placed in each of said vertical spaces (5) and / or interposed between the outer edge of the underside of said upper layer of said plate (4c) covering a framework element (2, 3) and the outer edge of the upper face of the plate (4b) covering a panel (1). Installation coupe-feu selon la revendication 1, caractérisée en ce que les panneaux (1) constitués de manière connue d'un assemblage d'une tôle inférieure (8), d'une tôle supérieure (11) et d'une âme souple (10) isolante phoniquement et thermiquement, comportent une feuille en matériau étanche (9) placée sur la face interne de la tôle inférieure (8).Fire protection installation according to claim 1, characterized in that the panels (1) constituted in a known manner by an assembly of a lower sheet (8), an upper sheet (11) and a flexible core ( 10) phonically and thermally insulating, comprise a sheet of impermeable material (9) placed on the internal face of the lower sheet (8). Installation coupe-feu selon la revendication 2, caractérisée en ce que la feuille en matériau étanche (9) est en polyéthylène, en aluminium, en papier ou en céramique.Fire protection installation according to claim 2, characterized in that the sheet of waterproof material (9) is made of polyethylene, aluminum, paper or ceramic. Installation coupe-feu selon l'une des revendications précédentes, caractérisée en ce que les joints intumescents (7) interposés entre le bord extérieur de la face inférieure de la couche supérieure de la plaque (4c) recouvrant un élément d'ossature (2, 3) et le bord extérieur de la face supérieure de la plaque (4b) recouvrant un panneau (1) sont placés au contact de ladite plaque (4c).Fire protection installation according to one of the preceding claims, characterized in that the intumescent joints (7) interposed between the outer edge of the lower face of the upper layer of the plate (4c) covering a framework element (2, 3) and the outer edge of the upper face of the plate (4b) covering a panel (1) are placed in contact with said plate (4c). Installation coupe-feu selon l'une quelconque des revendications précédentes, caractérisée en ce que les plaques ou couches (4a, 4b, 4c) de matériau isolant thermiquement recouvrant les éléments d'ossature (2, 3) et les panneaux (1) sont usinables avec les outils habituellement utilisés dans le domaine du bois.Fire protection installation according to any one of the preceding claims, characterized in that the plates or layers (4a, 4b, 4c) of thermally insulating material covering the framework elements (2, 3) and the panels (1) can be machined with the tools usually used in the field of wood. Installation coupe-feu selon la revendication 5, caractérisée en ce que lesdites plaques ou couches (4a, 4b, 4c) sont en silicate de calcium, en céramique ou en plâtre.Fire protection installation according to claim 5, characterized in that said plates or layers (4a, 4b, 4c) are made of calcium silicate, ceramic or plaster. Installation coupe-feu pour panneau (1) faisant partie des plafonds suspendus auxquels s'applique l'installation définie par l'ensemble des revendications précédentes, visant à y permettre l'encastrement d'au moins un accessoire d'épaisseur supérieure à celle dudit panneau (1), caractérisée en ce qu'elle est constituée d'une part d'un empilement de couches (4c) de matériau isolant thermiquement fixé sur la plaque isolante (4b) autour de chaque cavité (15) pratiquée dans le panneau (1) pour permettre l'encastrement d'un accessoire, de manière à prolonger ladite cavité (15) jusqu'à une hauteur excédant celle dudit accessoire, et d'autre part, d'au moins une plaque (4c) horizontale fixée au-dessus dudit empilement, de dimensions horizontales supérieures à celles de la partie supérieure de la cavité (15) formée par l'empilement des couches (4c) précédentes, de sorte qu'un logement surélevé isolé est créé pour chaque accessoire.Fire protection installation for panel (1) forming part of the suspended ceilings to which the installation defined by all of the preceding claims applies, intended to allow the installation of at least one accessory of thickness greater than that of said panel (1), characterized in that it consists on the one hand of a stack of layers (4c) of thermally insulating material fixed on the insulating plate (4b) around each cavity (15) formed in the panel ( 1) to allow the fitting of an accessory, so as to extend said cavity (15) up to a height exceeding that of said accessory, and on the other hand, at least one horizontal plate (4c) fixed to- above said stack, of horizontal dimensions greater than those of the upper part of the cavity (15) formed by the stack of the previous layers (4c), so that an isolated raised housing is created for each accessory.
EP92440143A 1992-12-21 1992-12-21 Fire protecting assembly for suspended ceilings Withdrawn EP0603442A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92440143A EP0603442A1 (en) 1992-12-21 1992-12-21 Fire protecting assembly for suspended ceilings

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Application Number Priority Date Filing Date Title
EP92440143A EP0603442A1 (en) 1992-12-21 1992-12-21 Fire protecting assembly for suspended ceilings

Publications (1)

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EP0603442A1 true EP0603442A1 (en) 1994-06-29

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3617891A1 (en) * 1986-05-28 1987-12-03 Lindner Akustikbau Ceiling element, in particular for a fire-retarding ceiling
DE3815444A1 (en) * 1988-05-06 1989-11-16 Promat Gmbh Fireproof counter-ceiling
DE8912602U1 (en) * 1989-10-24 1989-12-14 AMF-Mineralplatten GmbH Betriebs KG, 94481 Grafenau Mineral fibre ceiling panel
DE9004023U1 (en) * 1990-04-06 1990-06-21 DIG Deutsche Innenbau GmbH, 4330 Mülheim Kit for a coffered ceiling
DE9100673U1 (en) * 1991-01-22 1991-04-11 Promat GmbH, 40878 Ratingen Self-supporting suspended ceiling for fire protection purposes
DE9205288U1 (en) * 1992-04-16 1992-06-17 Promat GmbH, 40878 Ratingen Plate-shaped ceiling element for fire protection purposes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3617891A1 (en) * 1986-05-28 1987-12-03 Lindner Akustikbau Ceiling element, in particular for a fire-retarding ceiling
DE3815444A1 (en) * 1988-05-06 1989-11-16 Promat Gmbh Fireproof counter-ceiling
DE8912602U1 (en) * 1989-10-24 1989-12-14 AMF-Mineralplatten GmbH Betriebs KG, 94481 Grafenau Mineral fibre ceiling panel
DE9004023U1 (en) * 1990-04-06 1990-06-21 DIG Deutsche Innenbau GmbH, 4330 Mülheim Kit for a coffered ceiling
DE9100673U1 (en) * 1991-01-22 1991-04-11 Promat GmbH, 40878 Ratingen Self-supporting suspended ceiling for fire protection purposes
DE9205288U1 (en) * 1992-04-16 1992-06-17 Promat GmbH, 40878 Ratingen Plate-shaped ceiling element for fire protection purposes

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