FR2639386A1 - Flexible sound-barrier - Google Patents

Abstract

It consists of the combination of a panel 19 of porous, absorbent and nonrigid material, such as synthetic foam or glass wool or rock wool of high density, of sufficient thickness to act as a silencer, on both faces of which a layer of absorbing and attenuating viscoelastic material 21 has been sprayed or adhesively bonded so as to create a double partition using the "mass-spring-mass" principle, the faces of the fibre panels consisting of a textile web 20 improving the bonding. It is intended for the building sector, and more particularly for office buildings.

Description

FLEXIBLE PHONIC BARRIER
The present invention relates to a flexible sound barrier.

It is intended for the building sector, and more particularly for office buildings.

In most of these buildings, the partitions are demountable partitions allowing the rearrangement of the premises quite easily. These partitions are mounted between floor and false acoustic ceiling. Above the false ceiling there is a void.

There is an increasing demand for acoustic performance for partitions, in order to avoid the perception of conversations or discomfort from office to office.

The noise passes on the one hand, through the partition, and on the other hand, by indirect transmission: it passes in the void of the false ceiling where it travels, to descend through the false ceiling in the neighboring office.

Acoustic ceilings, to be absorbent, must be porous, and are therefore weakly attenuating.

To avoid this indirect passage of noise, which greatly reduces the overall sound isolation between two offices, we put vertically, in extension of the partition separating two rooms, and above the false ceiling, a sound barrier. This sound barrier is a more ordinary and simple wall than the partition. Generally, a plasterboard or chipboard is used, or in more efficient cases, two plaster or chipboard, sandwiching a layer of glass wool or rock wool.

To be effective, the barrier must be perfectly adjusted, as well as all the cutouts for the through elements, such as, beams, ceiling framework with all the "T" spacers, passage of cables or ducts, etc ... Indeed, knowing that 2% of the surface in slots or holes causes a loss of sound attenuation from 20 to 22 dB (A), we see the importance of the precision of the cuts. However, it is not easy to take the dimensions with precision, make the approximate cuts, properly adjust the rigid panels, which leads either to too much broken through sound barriers, with poor performance, or very long and very expensive works.

The device according to the present invention eliminates all these drawbacks. In fact, it makes it possible to obtain flexible and compressible sound barriers, which can be satisfied with imprecise cuts, which are easy to implement, while providing an excellent seal against noise and, consequently, very good acoustic performance.

It consists of the combination of a panel of porous, absorbent and non-rigid material, such as synthetic foam or high density glass or rock wool, of sufficient thickness to act as a silencer, on both sides. from which a layer of shock absorbing and attenuating viscoelastic material has been projected or glued, so as to create a double partition according to the "mass-spring-mass" principle, the faces of the fiber panels being made up of a textile web improving the adhesion .

This gives a very light, flexible multi-layer panel, which can be fixed without accessories by elastic forcing between the ceiling and false ceiling, can be cut off with a blade (cutter), making it possible to make rough cuts, preferably smaller than the object passing through. , on which they will fit correctly, thanks to the elasticity of the material.

In the accompanying drawings, given by way of nonlimiting example of one of the forms of the invention
Figure 1 schematically shows the passage of noise between two adjacent rooms with false ceilings.

Figure 2 is a schematic section showing the structure of the sound barrier.

Figure 3 illustrates the implementation of the object of the invention.

Figure 1 shows two adjacent rooms 1, 2 separated by an acoustic partition 3 going from the floor G to the false ceiling 5. This leaves a void between the false ceiling and the ceiling 6 7. The annoying noise, to go from room 1 to the part 2 for example, can pass through the partition 3 along the arrow 17 or pass through the void 7 by following the path shown by the arrows 18.

To avoid this, a sound barrier 8 is put in place according to the invention, which is blocked by force between the false ceiling 5 and the ceiling 6, and consisting (fig 2) of a panel 19 of rock wool or glass. of appropriate density, the two faces of which consist of a textile web 20 on which is projected or glued on each side of the panel, a thin wall made of a viscoelastic material 21 damping and attenuating, so as to form a double insulating, flexible partition and elastic.

The fiber panel covered with textile sails can be replaced by a synthetic foam panel.

The viscoelastic material 21 can be of fire-resistant quality, which with a rock wool panel 19 with glass fleece surfaces can make the entire sound barrier non-combustible, and even fire-resistant.

Figure 3 shows an example, current implementation of the object of the invention. The elements 9, 13 of the framework of the false ceiling 5 pass through the sound barrier 8 by means of a simple knife line 10, 14 made at its base. The sound barrier is crossed by a pipe 11, for which the installer has made a cutter slightly smaller than the pipe, on which the barrier 8 is applied tightly thanks to its compressibility.

The suspension rods 15 of the false ceiling 5 located to the right of the partition 3 are introduced inside the sound barrier 8 by simply practicing in the latter a vertical slit at mid-thickness.

Thanks to its acoustic performance, and especially to its particularly easy and inexpensive implementation, the sound barrier object of the invention can be used advantageously in particular when good sound insulation is sought between rooms with false ceilings, but also in all cases where the planned sound barrier does not require mechanical resistance.

The positioning of the various constituent elements gives this device a maximum of useful effects which had not been obtained to date by similar effects.

However, the shapes and arrangements of the various elements, as well as the materials used for their manufacture, may vary within the limit of equivalents, without changing the general conception of the invention which has just been described.

Claims (1)

CLAIMS'S 1 Flexible sound barrier, intended to be placed in a vacuum (7d located between the ceiling (6) and, false ceiling (5), in particular between the offices (1, 2) equipped with removable partitions (3) and having for object a multi-layer panel with very good acoustic performance while allowing easy and inexpensive implementation, characterized by a panel (19) of porous material absorbing non-rigid noise but of high density, on both sides of which is glued or projected a thin wall (21) consisting of a viscoelastic shock absorbing and attenuating product, the whole forming a flexible and compressible mass-spring-mass system, which can be cut (10, 14, 16) with a knife blade, and fixed without installation accessories by elastic forcing between the ceiling (6) and false ceiling (5), the soundproofing being ensured by cutouts of dimensions slightly smaller than those of the through objects (9, 11, 13, 15), on which the sound barrier (8) will be applied in a sealed manner thanks to the elasticity of the materials constituting it. 2 "flexible sound barrier, according to claim 1, characterized in that the absorbent central panel (19) consists of rock or glass fibers covered on both sides with a textile veil (20) intended to facilitate the attachment of the viscoelastic material (21). 30 Flexible sound barrier according to claims 1 and 2, characterized in that the central panel (19) is made of non-combustible rock wool, with faces made of glass fleece (20), and that the walls (21) are viscoelastic fire-resistant material.