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United States Patent Application 20170275834
Kind Code A1
Clavier; Emilie ;   et al. September 28, 2017

ANTI-NOISE FACILITY FOR TRACKED TRANSPORT ROAD AND TRACKED TRANSPORT ROAD PROVIDED WITH SUCH A FACILITY

Abstract

The invention relates to anti-noise installation for a guided transport track having a U-shaped cross section, the two branches of which form the lateral walls (15, 16) of the track and the central zone of which, connecting the two branches, forms at least one runway (18) for a guided transport vehicle (50), characterised in that said installation comprises a plurality of acoustic panels (30, 31, 34, 35, 38, 39) arranged relative to one another so as to form at least one chamber (20) for confining the noise resulting from the passage of a vehicle (50) over at least one runway (18), which chamber can be provided around said noise source while extending as far as a free end of at least one branch of the U, each panel (30, 31, 34, 35, 38, 39) forming at least one portion of a partition of a noise-confinement chamber (20).


Inventors: Clavier; Emilie; (Paris, FR) ; Lapassat; Claire; (Paris, FR) ; Augis; Eric; (Toussieu, FR) ; Wouts; Ivan; (Paris, FR)
Applicant:
Name City State Country Type

SYSTRA

Paris

FR
Family ID: 1000002718910
Appl. No.: 15/509193
Filed: August 20, 2015
PCT Filed: August 20, 2015
PCT NO: PCT/FR2015/052240
371 Date: March 7, 2017


Current U.S. Class: 1/1
Current CPC Class: E01F 8/0011 20130101; E01F 8/0064 20130101; E01F 8/0005 20130101; E01B 19/003 20130101; E01B 2/003 20130101; E01F 8/0035 20130101
International Class: E01F 8/00 20060101 E01F008/00; E01B 2/00 20060101 E01B002/00; E01B 19/00 20060101 E01B019/00

Foreign Application Data

DateCodeApplication Number
Sep 10, 2014FR1458462

Claims



1. An anti-noise installation for a guided transport track having a U-shaped cross section forming a U, two branches of the U of which form lateral walls of the track and a central zone, connects the two branches and forms at least one runway for a guided transport vehicle the installation comprising: plurality of acoustic panels arranged relative to one another so as to form at least one chamber for confining a source of noise resulting from passage of a vehicle on at least one runway, said chamber provided around said noise source while extending as far as a free end of at least one of the branches of the U, each acoustic panel forming at least one portion of a partition of a noise-confinement chamber.

2. The anti-noise installation according to claim 1, wherein at least one acoustic panel is a cap mounted on free end of at least one of the branches of the U, in parallel with each runway, extending in the direction of the branch of the U facing the branch on which it is mounted, so as to form a top partition of a noise-confinement chamber.

3. The anti-noise installation according to claim 1, wherein at least one acoustic panel is a skirt carried by said vehicle perpendicularly to each runway, and wherein at least one acoustic panel is a bottom screen mounted on a runway facing said skirt, so as form a lateral partitions of at least one noise confinement chamber.

4. The anti-noise installation according to claim 1, wherein at least one acoustic panel is a lateral panel mounted in a vicinity of a lateral wall of the track, perpendicularly to each runway, so as to form a lateral partition of at least one noise-confinement chamber.

5. The anti-noise installation according to claim 1, wherein at least one acoustic panel is a lateral mat attached to the lateral wall of the track, forming a U-shaped branch, so as to form a lateral partition of at least one noise-confinement chamber.

6. The anti-noise installation according to claim 1, wherein at least one acoustic panel is an absorbent slab (34a, 34b, 34c), suitable for being attached to a runway (17, 18) so as to form a bottom partition of at least one noise-confinement chamber (20).

7. The anti-noise installation according to claim 1, wherein said acoustic panels are arranged to form at least one noise-confinement chamber compatible with said guided transport track on which the installation is mounted.

8. The anti-noise installation according to claim 1, wherein said acoustic panels are removably attached to one another.

9. The anti-noise installation according to claim 2, wherein said acoustic panels are arranged relative to one another so as to form at least two noise-confinement chambers provided in series between the noise source and a free end of at least one branch of the U.

10. The anti-noise installation according to claim 1 wherein comprises at least one acoustic panel comprises a central panel attached to the track between two runways of the guided transport track while extending perpendicularly to the two runways so as to form a lateral partition of at least one noise-confinement chamber.

11. The anti-noise installation according to claim 1, wherein each acoustic panel is either an absorbent panel or a blocking panel.

12. The anti-noise installation according to claim 11, wherein at least one absorbent panel is formed of a material selected from the group consisting of porous concrete, timber concrete, rubber concrete, rockwool, glass wool, steel, PVC, and EPDM.

13. A guided transport track having a cross section in the form of a splayed U, two branches of which form lateral walls of the track and a central zone of which, connecting the two branches, forms a runway for a guided transport vehicle, wherein the track comprises an anti-noise installation comprising: a plurality of acoustic panels arranged relative to one another so as to form at least one chamber for confining a source of noise resulting from the passage of a vehicle on at least one runway, said chamber provided around said noise source while extending as far as a free end of at least one of the branches of the U, each acoustic panel forming at least one portion of a partition of a noise-confinement chamber.
Description



1. TECHNICAL FIELD OF THE INVENTION

[0001] The invention relates to an anti-noise installation for a guided transport track , in particular for a viaduct having a U-shaped cross section. The invention also relates to a guided transport track, and in particular a viaduct, equipped with an installation according to the invention.

2. TECHNOLOGICAL BACKGROUND

[0002] Public guided transport such as metros and trains generate high noise levels that result in particular from the interactions between the wheels of the transport vehicles and the runways such as rails on which these vehicles travel.

[0003] This problem of noise is a particular nuisance when the tracks are laid out in urban areas, in the immediate vicinity of residential zones, in particular in the context of viaducts or overhead tracks.

[0004] One of the technical solutions frequently used on this type of track is that of installing acoustic barriers two to three metres high that border the track so as to trap the noise and limit the propagation thereof beyond the immediate vicinity. These barriers make it possible to counter the propagation of noise by reflecting the acoustic waves that reach the internal face of the barrier.

[0005] This solution does however have several drawbacks, including the fact that the field of vision of the nearby residents is obstructed due to the presence of particularly imposing acoustic barriers.

[0006] Apart from the visual impact, the acoustic barriers are ineffective, or even aggravate the noise situation for nearby residents living in buildings located higher than the viaduct, because of the multiple reflections off the vehicle bodies or the screens on the opposite track.

[0007] Furthermore, this solution requires a large amount of space and has significant wind resistance, which has a not insignificant impact on the forces to which the engineering structure is subjected, and weighs down the structure on which it is used. Thus it is only possible to equip engineering structures, and in particular viaducts, that have been oversized during construction with anti-noise barriers of this kind. Only oversized viaducts can subsequently withstand new stresses and therefore be equipped with these anti-noise barriers. Other structures are condemned to be noisy and therefore to be detrimental to the nearby residents and/or to make the surrounding areas unpropitious for residential accommodation.

[0008] Finally, the solution of anti-noise barriers provided along tracks does not make it possible, once the barriers have been installed along the track, to modify the performance level, unless the anti-noise barriers are replaced by new barriers.

[0009] It is therefore necessary to provide a novel solution for limiting the noise caused by the passage of guided transport vehicles on engineering structures of the viaduct or bridge type.

[0010] It is also necessary to provide a solution that makes it possible to adapt all types of viaduct, in particular viaducts that have not been oversized during construction.

[0011] It is also necessary to provide a solution that makes it possible to provide different performance levels according to the needs expressed by the nearby residents.

3. OBJECTIVES OF THE INVENTION

[0012] The invention aims to overcome at least some of the drawbacks of the known solutions for limiting the noise heard by those living alongside engineering structures, of the bridge or viaduct type, in particular viaducts having a U-shaped cross section, in particular in the form of a splayed U.

[0013] In particular, the invention aims to provide an anti-noise installation for a viaduct that does not impact on the visual field of the nearby residents.

[0014] The invention also aims to provide, in at least one embodiment, an anti-noise installation that can be adapted to various viaduct designs without major difficulty.

[0015] The invention also aims to provide, in at least one embodiment of the invention, an anti-noise installation that is easy to maintain.

[0016] The invention also aims to provide, in at least one embodiment of the invention, an installation that makes it possible to respond to various distinct performance levels.

[0017] The invention also aims to provide, in at least one embodiment, a viaduct equipped with an anti-noise installation according to the invention.

4. DISCLOSURE OF THE INVENTION

[0018] To do this, the invention relates to an anti-noise installation for a guided transport track having a U-shaped cross section, in particular in the form of a flared U, the two branches of which form the lateral walls of the track and the central zone of which, connecting the two branches, forms at least one runway for a guided transport vehicle, characterised in that said installation comprises a plurality of acoustic panels arranged relative to one another so as to form at least one chamber for confining a source of noise resulting from the passage of a vehicle on said runway, which chamber can be provided around said noise source while extending as far as a free end of at least one branch of the U, each acoustic panel forming at least one portion of a partition of a noise-confinement chamber.

[0019] The invention therefore makes it possible to form at least one noise-confinement chamber arranged around the source of the noise, which results from the passage of the wheels of a vehicle over the runway, for example wheels of a train on the rails, and the free end of the lateral walls of the U-shaped viaduct. A noise-confinement chamber is a chamber that has partitions suitable for optimally insulating the space containing the sources of noise from the space downstream thereof and thus for attenuating the noise. The invention proposes confining the sources of noise resulting from the dynamic interaction of the wheels of a vehicle with the runway by using the space available between these sources and the lateral walls of the U-shaped viaduct. Since space is limited, the invention proposes using a plurality of acoustic panels and arranging them relative with one another so as to form various partitions of at least one noise-confinement chamber without these exceeding the outer dimensions of the viaduct, such that the visual impact of the installation is limited.

[0020] The invention uses and optimises the U-shape of the viaduct by forming a noise-confinement chamber that lies entirely within the permitted space between the source of the noise and the free end of the branches of the U. In other words, each portion of the U-shaped viaduct is used to reduce the noise emissions. The invention therefore takes advantage of the specific shape of the viaduct for reducing the noise emissions by integrating various acoustic panels therein.

[0021] Furthermore, the confinement chamber is provided around the source of the noise, extending as far as the free end of the lateral walls. In other words, the acoustic panels do not extend beyond the viaduct. In particular, no acoustic panel projects beyond the free end of the lateral walls. All the acoustic panels are therefore provided between the lateral walls of the viaduct. The visual impact of an anti-noise installation is therefore zero for the nearby residents. A viaduct that is carefully designed and that has aesthetic curves is therefore not compromised by the arrangement of an anti-noise installation according the invention, unlike the noise-reduction barriers of the prior art.

[0022] According to the invention, the confinement chamber is formed by arranging a plurality of acoustic panels, each panel forming at least one portion of a partition of a confinement chamber. It is therefore particularly easy to adapt the shape and dimensions of the noise-confinement chambers to the dimensions of the vehicles travelling on the track by moving and/or modifying the shape and dimensions of one or more acoustic panels.

[0023] It is also particularly easy to adapt the shape and dimensions of noise-confinement chambers to the required performance level. For example, an installation according to the invention makes it possible to adapt the sound attenuation produced to a specific requirement by modifying the shape of the confinement chamber produced by the arrangement of the acoustic panels. The performance may also be determined by the type of acoustic panels used. Furthermore, depending on the dimensions of the vehicle travelling on the track, only some of the acoustic panels of the plurality of acoustic panels may be used.

[0024] The confinement chamber is preferably formed by the combination of the acoustic panels, the vehicle and the U-shaped viaduct. In other words, the acoustic panels are at least arranged so as to form partitions where the vehicle and the viaduct do not form walls preventing the propagation of the noise.

[0025] Advantageously, and according to the invention, each acoustic panel is either an absorbent panel or a blocking panel. An absorbent panel is an acoustic panel comprising a material suitable for absorbing at least some of the noise that reaches it. A blocking panel is an acoustic panel formed of a material suitable for blocking the propagation of the acoustic waves that reach it.

[0026] Advantageously, an installation according to the invention comprises at least one acoustic panel, referred to as a cap, suitable for being mounted on the free end of at least one branch of the U, in parallel with said runway, extending in the direction of the branch of the U facing the branch on which it is mounted, so as to form a top partition of a noise-confinement chamber.

[0027] Each cap forms an upper partition of at least one noise-confinement chamber. Each cap is arranged at the end of a lateral wall of the track towards the lateral wall of the opposite track, in parallel with the runway. In other words, each cap delimits the upper part of the chamber while not extending beyond the viaduct. An anti-noise installation according to the invention and according to this variant therefore does not create a visual impact for nearby residents. Each cap forms, together with the lateral wall of the U-shaped viaduct on which it is arranged, a cavity that traps the acoustic waves emitted by the noise source, which substantially reduces the noise transmitted to those living near the viaduct when vehicles pass over the transport track. The cap may have dimensions so as to extend as close as possible to the vehicle travelling on the track in order to limit to the maximum possible extent the leakage surface formed by the space between the free end of the cap and the vehicle.

[0028] Advantageously, an anti-noise installation according to the invention comprises at least one acoustic panel, referred to as a skirt, suitable for being carried by said vehicle perpendicularly to said runway, and at least one acoustic panel, referred to as a bottom screen, suitable for being mounted on said runway facing said skirt, so as form a lateral partition of at least one noise-confinement chamber.

[0029] An anti-noise installation according to this variant therefore makes it possible to form, by combining a skirt carried by the vehicle and a bottom screen mounted on the runway, a lateral partition of a localised noise-confinement chamber that moves when the vehicle moves. In particular, the chamber is only formed when the train is present on the viaduct. This lateral partition is not continuous, but has a space between the skirt and the bottom screen to enable the vehicle to travel on the track. This space between the bottom screen and the skirt determines the leakage surface towards the outside of the confinement chamber to which the formed partition belongs. This surface can therefore be parameterised by adapting the dimensions of the skirt and of the bottom screen to the dimensions of the vehicles travelling on the track.

[0030] Preferably, the installation comprises two skirts carried laterally on each side of the vehicle and a bottom screen mounted on the track facing each skirt.

[0031] Advantageously, an anti-noise installation according to the invention comprises at least one acoustic panel, referred to as a lateral panel, suitable for being mounted in the vicinity of a lateral wall of the track, perpendicularly to the runway, so as to form a lateral partition of at least one noise-confinement chamber.

[0032] In a variant or in combination, the installation comprises at least one acoustic panel, referred to as a lateral mat, suitable for being attached to the lateral wall of the track, forming a branch of the U, so as to form a lateral partition of at least one noise-confinement chamber.

[0033] A lateral mat can follow the shape of the lateral wall of the U-shaped track so as to form a lateral partition of a noise-confinement chamber.

[0034] Advantageously, an anti-noise installation comprises at least one acoustic panel, referred to as a slab, suitable for being attached to the runway so as to form a bottom partition of at least one noise-confinement chamber.

[0035] Advantageously and according to the invention, said acoustic panels, in particular the absorbent panels, are suitable for being arranged in various distinct configurations so as to form at least one noise-confinement chamber that is compatible with the design of said guided transport track on which the installation is used.

[0036] An installation according to this variant makes it possible to adapt the design of the confinement chambers formed by the arrangement of the acoustic panels, in particular the absorbent panels, to various types of track and to the specific constraints and requirements of each track.

[0037] Advantageously, an installation according to the invention further comprises means for removably attaching said acoustic panels, in particular the absorbent panels, so as to allow easy installation/removal of each acoustic panel, in particular of each absorbent panel.

[0038] According to this variant, the installation and removal of an acoustic panel on the track or on the vehicle is done by means of removable attachment means, which makes it easier to maintain an anti-noise installation according to the invention and which makes it possible to easily adapt the design of the chambers formed by the acoustic panels to the dimensions of the vehicles travelling on the track. These removable attachment means comprise, for example, means of the screw-and-nut type.

[0039] Advantageously and according to the invention, said acoustic panels are arranged relative to one another so as to form at least two noise-confinement chambers that can be provided in series between the noise source and a free end of at least one branch of the U.

[0040] According to this variant, the installation forms at least two noise-confinement chambers arranged in series between the noise source and the outside of the viaduct. In particular, the first confinement chamber leads into the second confinement chamber, which leads to the outside of the viaduct, at the cap. The first chamber comprises, for example, a bottom partition formed by slabs, lateral partitions formed by skirts and bottom screens, and a top partition formed by the vehicle. The second confinement chamber comprises, for example, a bottom partition formed by slabs, lateral partitions formed respectively by a skirt and a bottom screen (this partition is common with the first chamber), and by a lateral mat, and a top partition formed by a cap. The space between the skirt and bottom screen of the common partition forms a passage from the first chamber to the second chamber. The space between the free end of the cap and the vehicle forms a leakage surface of the second chamber.

[0041] An anti-noise installation according to the invention can be used in connection with a guided transport track comprising two adjacent runways. In this case, the anti-noise installation advantageously comprises at least one acoustic panel, referred to as a central panel, suitable for being attached to the track between the two runways while extending perpendicularly to the runways so as to form a lateral partition of at least one noise-confinement chamber.

[0042] Advantageously and according to the invention, at least one absorbent acoustic panel is formed of a material chosen from the group comprising porous concrete, timber concrete, rubber concrete, rockwool, rockwool, steel, PVC, EPDM or a combination of a plurality of these materials.

[0043] Each of these materials offers good acoustic and/or structural performance and can be used to form one or more absorbent acoustic panels of an anti-noise installation according to the invention.

[0044] The invention also relates to a guided transport track having a U-shaped cross section, in particular in the form of a flared U, the two branches of which form the lateral walls of the track and the central zone of which, connecting the two branches, forms a runway for a guided transport vehicle, characterised in that it comprises an anti-noise installation according to the invention.

[0045] The invention also relates to an anti-noise installation and a track equipped with an anti-noise installation, characterised in combination by all or some of the features mentioned above or below.

5. LIST OF FIGURES

[0046] Other aims, features and advantages of the invention will become apparent from reading the following description given solely by way of non-limitative example and which refers to the accompanying figures, in which:

[0047] FIG. 1 is a schematic perspective view of a guided transport track according to an embodiment, equipped with an anti-noise installation according to an embodiment of the invention;

[0048] FIG. 2 is a schematic cross-sectional view of FIG. 1;

[0049] FIG. 3 is a schematic perspective view of a guided transport track equipped with an anti-noise installation according to an embodiment of the invention;

[0050] FIG. 4 is a schematic cross-sectional view of FIG. 3;

[0051] FIG. 5 is a schematic cross-sectional view of a guided transport track equipped with an anti-noise installation according to an embodiment of the invention, in which caps and bottom screens are shown;

[0052] FIG. 6 is a schematic cross-sectional view of a guided transport track equipped with an anti-noise installation according to an embodiment of the invention, in which lateral mats are shown;

[0053] FIG. 7 is a schematic cross-sectional view of a guided transport track equipped with an anti-noise installation according to an embodiment of the invention, in which a central panel is shown;

[0054] FIG. 8 is a schematic cross-sectional view of a guided transport track equipped with an anti-noise installation according to an embodiment of the invention, in which caps, lateral panels, a central panel and bottom screens are shown;

[0055] FIG. 9 is a schematic cross-sectional view of a guided transport track equipped with an anti-noise installation according to an embodiment of the invention, in which absorbent slabs are shown;

[0056] FIG. 10 is a schematic cross-sectional view of a guided transport track equipped with an anti-noise installation according to an embodiment of the invention, in which lateral panels, bottom screens and a central panel are shown;

[0057] FIG. 11 is a schematic cross-sectional view of a guided transport track equipped with an anti-noise installation according to an embodiment of the invention, in which caps, lateral panels, bottom screens and a central panel are shown.

6. DETAILED DESCRIPTION OF AN EMBODIMENT OF THE INVENTION

[0058] In the figures, the scales and proportions are not strictly respected for purposes of illustration and clarity. Throughout the following detailed description given with reference to the figures, unless otherwise indicated, each element of the anti-noise installation is described as it is arranged when the installation is mounted on a guided transport track. This arrangement is in particular shown in FIGS. 2 and 4.

[0059] A guided transport track according to the invention intended to be equipped with an anti-noise installation according to the invention has a cross section in the shape of a U, the two branches of which form the lateral walls 15, 16 of the track and the central zone of which, connecting the two branches, forms runways 17, 18 for a guided transport vehicle 50. In the figures, the guided transport track is a track comprising two adjacent runways 17, 18 so that two vehicles can pass each other.

[0060] Throughout the remainder of the detailed description, only the anti-noise installation arranged in relation to the runway 18 will be described precisely, it being understood that the anti-noise installation may be symmetrical and have an identical design in relation to the runway 17.

[0061] The anti-noise installation according to the invention comprises a plurality of acoustic panels arranged relative to one another so as to form at least one chamber 20 for confining the noise resulting from the passage of a vehicle over a runway 18. This confinement chamber 20 is shown schematically by a dashed line in FIG. 2. The chamber 20 surrounds the noise-generating zone that is formed by the wheels 51 of the vehicle 50 and the rails 52 carried by the runway 18. This chamber 20 extends in the noise-formation zone as far as the free end of at least one lateral wall 16 of the track.

[0062] According to the embodiment in the figures, the acoustic panels are all absorbent panels. This being the case, according to other embodiments, one or the other of the absorbent panels described below may be replaced by a blocking panel.

[0063] An anti-noise installation according to the embodiment in the figures therefore comprises a plurality of absorbent panels and in particular: [0064] caps 30, 31 mounted on the free end of the lateral walls 15, 16, respectively, in parallel with the runways, extending in the direction of the opposite lateral walls; [0065] lateral panels 32, 33 mounted perpendicularly to the runways in the vicinity of each lateral wall 15, 16, respectively; [0066] a plurality of absorbent slabs 34 arranged on the runways 17, 18; [0067] a central panel 35 attached to the track between the two runways 17, 18, extending perpendicularly to the runways; [0068] a skirt 36a, 36b carried by the vehicle 50 perpendicularly to the runway 17; [0069] bottom screens 37a, 37b mounted on the runway 17 facing the skirts 36a, 36b; [0070] lateral mats 38, 39 arranged on the lateral walls 15, 16, respectively, of the track.

[0071] The invention makes it possible to form one or more noise-confinement chambers by using at least some of these various absorbent panels and arranging said panels relative to one another.

[0072] To do this, the invention aims to form at least one lateral partition for preventing noise from propagating laterally towards the end of the viaduct, and a top partition for preventing the propagation of noise outside the viaduct.

[0073] FIGS. 1 and 2 show a design of an anti-noise installation according to the invention, in which only a central panel 35, absorbent slabs 34, caps 30, 31 and mats 38, 39 are used to form a noise-confinement chamber 20.

[0074] FIGS. 3 and 4 show another design in which skirts 36a, 36b, bottom screens 37a, 37b, lateral panels 32, 33 and a central panel 35 are used to form a first noise-confinement chamber 22 and a second chamber 21 into which the chamber 22 leads. This design affords a substantial reduction in the noise by arranging two noise-confinement chambers 21, 22 in series.

[0075] Hereinafter, various embodiments of each absorbent panel will be described in relation to FIGS. 5 to 11.

[0076] In FIG. 5, only caps 30, 31 and bottom screens 37a, 37b are shown for purposes of illustration and clarity. The caps are formed according to this embodiment from porous concrete and may be crenelated on the bottom part 60 oriented towards the runway 17 so as to increase the absorbent surface area. According to other embodiments, the caps may be formed of extruded EPDM, or from folded sheet metal having a thickness of, for example, 0.8 mm.

[0077] Whatever the material used, each cap has holes 61 extending in parallel with the runway and suitable for receiving attachment means of the screw-and-nut type. According to an advantageous embodiment, each cap has a top surface having a slight slope, for example of approximately 3%, towards the runway, for allowing rainwater to run off.

[0078] The caps extend over a distance of, for example, 10 to 20 cm from the edge of the lateral wall on which they are mounted and extend along the track over a distance of, for example, 6 m.

[0079] FIG. 5 also shows bottom screens 37a, 37b intended to form, together with the skirts 36a, 36b, not shown in FIG. 5, at least one lateral wall of a noise-confinement chamber. The bottom screens 37a, 37b of the embodiment in FIG. 5 have a structure identical to that of the caps 30, 31 described in relation to FIG. 4.

[0080] In FIG. 6, only one lateral mat 39 is shown in detail for purposes of illustration and clarity. It is, for example, formed of timber concrete or rubber concrete and is applied directly against the lateral wall 16 of the viaduct. According to the embodiment in FIG. 6, the mat 39 also carries a rack 64 pegged directly in the concrete of the viaduct. This rack 64 is intended to carry electric cables used for the functioning of the guided transport and/or for the viaduct. In this case, the mat 39 may be held against the lateral wall by means of the attachment means of the rack 64. According to another embodiment, the lateral mat is directly attached to the lateral wall by attachment means of the nails-for-insulation type. The lateral mat 39 may be crenelated in order to maximise the absorbent surface area.

[0081] In FIG. 7, only one central panel 35 is shown in detail for purposes of illustration and clarity. It is, for example, formed by two panels made from porous concrete or timber concrete. It may further comprise an H-shaped steel profile that covers the edges of the two panels and thus mechanically holds these panels in place. The panel further comprises two plates welded to each longitudinal end of the central panel so as to allow attachment of the panel to the runway.

[0082] In FIG. 8, in addition to a central panel 35, a lateral panel 33, a bottom screen 37a and a cap 31 according to another embodiment of the invention are shown. The lateral panel 33 is a timber concrete panel surrounded by a protective metal sheet. The cap 31 is a cap made from timber concrete surrounded by a protective metal sheet. The bottom screen is made from timber concrete surrounded by a protective metal sheet. The protective metal sheet is, for example, a sheet 1.5 mm thick and the timber concrete has a thickness of, for example, 133 mm. Naturally, according to other embodiments, the thicknesses and materials may be chosen differently without calling into question the subject matter of the invention.

[0083] In FIG. 9, only absorbent slabs 34 are shown. These slabs form the bottom partitions of the confinement chambers. In FIG. 8, three types of slab are shown: an absorbent slab 34a made from rubber concrete or porous concrete, a first slab 34b in two parts for following the drainage slope of the track, and a second slab 34c in two parts for following the drainage slope of the track in the central zone of the track.

[0084] In FIG. 10, the central panel 35, the lateral panels 32, 33 and the bottom screens 37a are formed of PVC and rockwool. Panels of this kind are, for example, formed by two heat-welded PVC half-shells that surround the rockwool. For example, the rockwool is 10 cm thick and the half-shells have a thickness of a few mm. The half-shells are also perforated every 20 mm, each hole having a diameter of 10 mm. Naturally, according to other embodiments, the thickness of the materials and the frequency and size of the perforations may be different.

[0085] In FIG. 11, the central panel 35, the lateral panels 32, 33, the bottom screens 37a and the caps 30, 31 are formed of perforated sheet metal and rockwool. The perforated metal sheet has a thickness of, for example, 0.6 mm and the rockwool a thickness of 10 cm. Panels of this kind are, for example, formed by two heat-welded PVC half-shells.

[0086] The invention is not limited solely to the embodiments described. In particular, other types of material may be used to form the acoustic panels, in particular the absorbent panels.

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