EP0538145B1 - Roof with integrated acoustical absorption - Google Patents

Description

• un support en tôle d'acier nervuré dont les nervures ont des flancs perforés et sont reliées par des plages;
• une barre rigide comportant un corps d'absorption acoustique qui emplit partiellement chaque nervure du support en en épousant la forme;
• une couche d'isolation thermique qui recouvre le support et est fixée sur les plages de celui-ci; et
• un revêtement d'étanchéité recouvrant la couche d'isolation thermique.

The present invention relates to a roof with integrated sound absorption, of the type comprising:

• a support made of ribbed sheet steel, the ribs of which have perforated sides and are connected by pads;
• a rigid bar comprising an acoustic absorption body which partially fills each rib of the support by conforming to its shape;
• a thermal insulation layer which covers the support and is fixed on the pads thereof; and
• a sealing coating covering the thermal insulation layer.

It applies to the coverage of noisy premises with high humidity such as swimming pools, stationery, breweries, bottling halls, weaving workshops, industrial dairies, etc.

Patent application FR-A-2 635 603 describes a roof of the aforementioned type in which the insulating layer is vapor permeable, and consequently, the ribs are closed by bridges forming a vapor barrier. The insulating panels are mechanically fixed to the areas of the ribbed steel sheets, and air circulation is ensured above the sound absorption bars to avoid condensation of water in them.

The invention aims to provide a roof of the same type which is easier to implement while having at least equal sound absorption performance.

To this end, the subject of the invention is a roof of the aforementioned type, characterized in that the thermal insulation layer consists of a vapor barrier material and is fixed to the areas of the support by bonding, and in that on the upper face of each bar is defined a chute, the upper part of the bar covering on each side an unperforated area of the support adjacent to the perforated area of the rib.

Other features are described in subclaims 2 to 9.

• la Figure 1 représente schématiquement, en coupe verticale, une toiture conforme à l'invention;
• les Figures 2 à 4 représentent respectivement, en coupe transversale, trois variantes de barres d'absorption acoustique pour la toiture de la Figure 1; et
• les Figures 5 à 7 sont des vues analogues de trois variantes d'un autre mode de réalisation de barre d'absorption acoustique pour une telle toiture.

Examples of embodiments of the invention will now be described with reference to the appended drawing, in which:

• Figure 1 shows schematically, in vertical section, a roof according to the invention;
• Figures 2 to 4 show respectively, in cross section, three variants of sound absorption bars for the roof of Figure 1; and
• Figures 5 to 7 are similar views of three variants of another embodiment of the sound absorption bar for such a roof.

• un support 1 en tôle d'acier nervuré comportant des nervures 2 à section trapézoïdale convergente vers le bas, ouvertes vers le haut, et des plages supérieures 3 reliant les bords supérieurs des nervures. Chaque nervure s'étend perpendiculairement à des poutres parallèles 4 de la charpente du local et est fixée sur celles-ci par des fixations mécaniques (non représentées). Le fond des nervures 2 est perforé et il en est de même de leurs flancs, à l'exception de leur zone marginale supérieure 5, qui s'étend par exemple sur une hauteur h de l'ordre de 10 à 20% de la hauteur H des nervures;
• dans chaque nervure 2, une barre rigide 6 d'absorption acoustique. Dans cet exemple, le barre 6 est homogène et constituée d'un matériau rigide acoustiquement absorbant tel que la laine de roche ou de la mousse synthétique. La barre 6 présente une section trapézoïdale sensiblement identique à celle de la nervure 2, mais sa face supérieure présente sur toute sa longueur une goulotte centrale 7 à section en V. La goulotte 7 confère ainsi à la barre une section transversale elle-même en forme de V, avec deux flancs 8 qui s'étendent du fond de la nervure jusqu'au niveau des plages 3 et, par conséquent, recouvrent la totalité de la région perforée des flancs de la nervure;
• une couche d'isolation thermique 9 formant pare-vapeur, en panneaux de verre cellulaire imprégnés de bitume chaud en sous-face et sur leurs chants. Ces panneaux sont collés sur les plages 3 au moyen du bitume présent sur leur sous-face;
• un revêtement d'étanchéité 10 recouvrant la couche 9 et constitué notamment d'une membrane bitumineuse collée sur la couche 9 au moyen de bitume chaud.

The roof shown in Figure 1 is intended to cover a noisy room with high humidity. She understands :

• a support 1 made of ribbed sheet steel comprising ribs 2 with trapezoidal section converging downwards, open upwards, and upper pads 3 connecting the upper edges of the ribs. Each rib extends perpendicular to parallel beams 4 of the frame of the room and is fixed on these by mechanical fasteners (not shown). The bottom of the ribs 2 is perforated and the same is true of their sides, with the exception of their upper marginal zone 5, which extends for example over a height h of the order of 10 to 20% of the height H of the ribs;
• in each rib 2, a rigid bar 6 of acoustic absorption. In this example, the bar 6 is homogeneous and made of a rigid acoustically absorbent material such as rock wool or synthetic foam. The bar 6 has a trapezoidal section substantially identical to that of the rib 2, but its upper face has over its entire length a central chute 7 with a V-section. The chute 7 thus gives the bar a cross section itself in shape V, with two flanks 8 which extend from the bottom of the rib to the level of the pads 3 and, therefore, cover the entire perforated region of the flanks of the rib;
• a thermal insulation layer 9 forming a vapor barrier, made of cellular glass panels impregnated with hot bitumen on the underside and on their edges. These panels are glued to the tracks 3 by means of the bitumen present on their underside;
• a sealing coating 10 covering the layer 9 and in particular consisting of a bituminous membrane bonded to the layer 9 by means of hot bitumen.

When the layer 9 is bonded to the pads 3 of the ribbed steel sheets, the excess bitumen due to the sliding and compression of the insulating panels is recovered in the trough 7 and does not infiltrate until the perforations of the sides of the ribs. The same advantage exists if the layer 9 is fixed to the pads 3 by means of an adhesive different from hot bitumen, for example a cold adhesive.

Furthermore, in service, the chute 7, which delimits with the layer 9 a closed air cavity, offers a low thermal resistance between the bar 6 and the layer 9, so that the condensation temperature of the water is only reached within this layer 9. Consequently, there is no condensation in the bar 6, and this is obtained without increasing the thickness of the insulating layer 9.

These two favorable results are obtained on the one hand without bridging operation of the ribs, thanks to the fact that the layer 9 itself forms vapor barrier, and on the other hand without reducing the acoustic absorption power of the roof, since most of the height of the sides of the ribs is perforated and covered by the sides 8 of the bar 6.

In addition, the generally V-shaped cross-section bar used has good mechanical strength, which allows the movement of personnel.

Figures 2 to 4 show three other possible sections for the bar 6, each of them bringing substantially the same advantages: in the variant of Figure 2, the chute 7 is flared so that its edges point towards the top of the flanks 8 from the bar. In the case of Figure 3, the chute 7 has a trapezoidal section, consisting of two lateral straight lines 11 roughly parallel to the sides 8 of the bar, connected by a horizontal bottom 12. The bar of Figure 4 differs from that of FIG. 2 by the curvilinear shape, concave upwards, of the chute 7.

As shown in FIG. 5, the bar 6 can, instead of being homogeneous as in FIGS. 1 to 4, be composite and made up of a rigid lower body 13 made of absorbent material, of shape combined with that of the rib 2, whose sides 8 cover all the perforations of this rib. This body is surmounted by an attached chute 14 made of a more thermally conductive material than the acoustically absorbent material, in particular metal, which rises to level of areas 3 of ribbed steel sheets. This chute 14, which is not necessarily fixed to the body 13, has a flat bottom 15 and two flared wings 16 which are applied against the non-perforated upper marginal part 5 of the sides of the ribs. The chute 14 thus creates, in service, a thermal bridge between the body 13 and the insulating layer 9, so that the condensations inside the body 13 are again eliminated.

In the variant of Figure 6, the wings 16 are extended by horizontal flanges 17 which cover the marginal part of the adjacent pads 3. Consequently, in this variant, it is not necessary for the body 13 to itself be rigid so that one can circulate on the roof.

In the variant of Figure 7, the chute 14 has a flared V-shaped section similar to that of Figure 2, and it has on each edge a wing 18 directed downwards, the two wings 18 converging one towards the other and applying to the non-perforated upper marginal parts 5 of the rib.

Claims (9)

1. Roof with integral acoustical absorption, of the type comprising:
      a support (1) of ribbed sheet steel, the ribs (2) of which have perforated sides and are connected by flat areas (3);
      a rigid bar comprising an acoustical absorption member (6;13) which partially fills each rib of the support, whilst following the shape thereof;
      a thermally insulating layer (9) which covers the support (1) and is fixed to the flat areas (3) thereof; and
      a leaktight cladding (10) covering the thermally insulating layer (9),
      characterised in that the thermally insulating layer (9) consists of a material forming a vapour barrier and is fixed to the flat areas (3) of the support by adhesion, and in that, on the upper surface of each bar, a chute (7;14) is defined, the upper part of the bar covering, on each side, an unperforated zone of the support (1) adjacent to the perforated zone of the rib (2).
2. Roof according to claim 1, characterised in that the sides (8) of the acoustical absorption member (6; 13) cover all the perforations of the rib (2).
3. Roof according to claim 1 or 2, characterised in that the chute (7;14) has a V-shaped, trapezoidal or curvilinear section.
4. Roof according to any of claims 1 to 3, characterised in that the bar (6) is homogeneous and consists of a rigid, acoustically absorbent material.
5. Roof according to claim 4, characterised in that the bar (6) has a generally V-shaped cross section, the sides (8) thereof extending upwards substantially to the level of the flat areas (3) of the support (1).
6. Roof according to any one of claims 1 to 3, characterised in that the bar (6) is composite, its acoustical absorption member (13) being surmounted by a chute (14), notably of a thermally conductive material, the flanks (16;18) of which are adapted to fit against an upper marginal part of the sides of the rib.
7. Roof according to claim 6, characterised in that the flanks (16) of the chute are extended by lateral flanges (17) which abut on the marginal parts of the adjacent fiat areas (3) of the support (1).
8. Roof according to any one of claims 1 to 6, characterised in that the sides of the ribs (2) are perforated over about 80 to 90% of their height, the upper part (5) of the sides being unperforated.
9. Roof according to claim 8, characterised in that the sides of the ribs (2) are perforated from their very bottom.

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