FI117209B - Noise Barrier Fence - Google Patents

Description

117209

The invention relates to a noise barrier which comprises: at least two metal plates parallel to the barrier barrier, at least a first metal plate of which is provided with sound-perforating holes and at least a second metal plate has no holes and the plates are at least partially spaced from the first ; porous sound-absorbing material in a first interior space between said metal plates; and said first interior having a bottom surface and an opposing upper edge.

Noise barriers are commonly used at the edges of roads to prevent traffic noise from moving to, for example, residential areas. Noise barriers can be very heavy, like concrete wall screens, which prevent sound from passing through its mass. Alternatively, the noise barriers may be more lightweight, having porous sound-absorbing wool, typically mineral wool, between two metal plates, with the road side torn and the road side facing closed. Traffic noises will then penetrate through the holes 20 of the roadside metal plate and will be damped therein, so that it will not be reflected when the opposite solid metal plate prevents the passage of the sound through the barrier. Because rain and condensation water will in any case penetrate between the metal sheets by wetting the sound absorbing mineral wool, this type of noise barrier must have some form of water and moisture removal. Otherwise, the mineral: * ·· 25 livestock will freeze in the winter, which may result in a complete loss of sound insulation and breakage of your rail ']. In addition, mineral wool, when damp, can start growing: · · lichen on the ground, moss, etc., which degrades sound insulation and eventually destroys. * ··. due to the corrosion of the entire barrier. One way to remove water between the metal plates of the teaiues is to arrange a torn tube at the bottom of the wall, which acts as a drainage route for up to 30 m, while preventing the mineral wool from sliding down. Namely, mineral wool reaching down or moving down would obstruct the drainage path.

: Another similar way of keeping the lower part of the metal barrier free of mineral wool between the metal plates is described in EP-1 148 175, according to which a mineral wool plate or a glass wool plate lower than the height of the noise barrier 35 element is glued um-! / to a metal plate at a distance from the bottom of the element. In this publication * **, the thickness of the mineral wool or glass wool plate is also smaller than the distance between the metal plates of the fence element, which allows the gap to be ventilated by the air gap of the perforated metal plate 2 117209. However, such an air gap increases the thickness of the fence element. EP-0 368 135, on the other hand, attempts to solve the problems by forming the rear panel of the noise barrier panel made of wood cement board, a porous sound-absorbing portion of two indefinitely water repellent glass wool layers 5 having a back density greater than the noise source side. The front of this ai-panel consists of a set of tilted lamellae instead of a single panel. In all these noise barrier solutions, water, despite its various countermeasures, presents a considerable problem, since glassy wool as well as mineral wool always get wet despite any known pretreatment. In this case, there will be the aforesaid mold and consequently corrosion of the metal sheets, i.e., rapid loss of sound insulation properties and structural damage of the entire noise barrier. In particular, due to the lamellae, the thickness of the noise barrier of EP-0 368 135 is even greater than that of the barrier element of EP-1 148 175, of course, when comparing structures having the same sound insulation capacity, which thickness is clearly not considered in any way harmful.

The object of the invention is to provide noise barriers in which the harmful effects of moisture are eliminated as effectively as possible. Another object of the invention is to provide such a noise barrier with a minimum overall thickness while providing sufficient or excellent sound insulation. A third object of the invention is to provide such a noise barrier which is capable of attenuating the sound coming from both directions.

The problems described above can be eliminated and the objectives defined above can be achieved by: *** a noise barrier according to the invention, characterized by: ·: · as defined in claim 1. characterizing part.

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The most important advantage of the invention is that the use of the sound absorbing wool ... 30 according to the invention can be very effectively counteracted by the harmful effects of moisture. In addition, a particular embodiment of the invention surprisingly provides a very thin noise bar structure which would not be possible using known solutions. This very thin structure, in turn, enables the dual advantage of a'aa, which attenuates noise from both opposing directions, to be another advantage of the invention. 35 noise fence implementation suitable for use e.g. railroad tracks between the two.! .* you. There is very little space between the track pairs of tracks, especially in populated areas, due to the size of the tracks and the kinematic gauge of the trains, but noise must be reduced on both sides of both tracks to be effective. . A third advantage of the invention is that such a thin double-sided noise fence is made so rigid and robust that it can withstand the air pressure strikes caused, for example, by passing trains at high speed. A further advantage of the invention is the rapid, simple and thus inexpensive manufacture of the noise barrier 5 according to the invention. for the flexible and compressible nature of the rope-tied wool of the invention.

The invention will now be described in detail in the accompanying drawings, which are incorporated by reference.

FIG. 1 shows a double-sided noise barrier according to the most preferred embodiment of the invention, in which the sound-absorbing material according to the invention is used, in axonometric view, partially cut away. In this embodiment, the metal-15 slip plates with openings are connected by mechanical fasteners to a central hole-free metal plate.

FIG. 2A illustrates the step of assembling the double-sided noise barrier of FIG. 1, prior to squeezing the perforated surface plates into a central perforated metal plate, in section III-III of FIG. 3, corresponding to direction I of FIG.

. . FIG. 2B illustrates the assembly of a double-sided noise barrier according to Fig. 1 with a · · · *; *; * step in which the perforated face plates are pressed against a central perforated metal plate V, i.e. the finished noise barrier according to Fig. 1; IV corresponding to direction II of Figure 1. One surface plate is mechanically attached to the center plate and the other surface plate is otherwise connected to the center plate.

*** »» ·· FIG. 3 shows a single-sided me-* * * fencing according to another embodiment of the invention in which the sound-absorbing material of the invention is used, in axonometric view, partially cut away. In this embodiment, the metal * surface plates with openings are connected to the second non-perforated metal surface plate *: * with a suitable design.

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The noise barriers and also the panels or elements from which the noise barriers can be assembled 35 typically comprise two metal plates parallel to the noise barrier, i. E. panel panels surface panels. Of these surface plates, which are mostly made of a plastic coated steel plate, the first metal plate 1 is provided with sound-perforating holes 11, which, when installed in the noise barrier, are positioned to indicate 4 117209 in the direction of the noise source. Of these surface plates, the second metal plate 2 has no holes, i.e., a solid or perforated plate, and is positioned on the side of the noise barrier which faces away from the noise source. These metal surface plates 1 and 2 are at least partially located at a first distance S1 from each other, forming a first interior space V1 therebetween. This first interior space V1 between the metal sheets contains a porous sound attenuation material 4a which absorbs sound entering the interior through holes 11 or corresponding openings in the first metal sheet 1. The closed second metal plate 2 again prevents the penetration of sound entering the interior. Because the noise barrier 10 as well as the panels 10 which are the structural elements of the fence necessarily have a certain height - essentially in the direction of gravity - the bottom surface 6 and the opposite upper edge 7 of the first interior space V1 are generally described. absorbent material and one of the opposed sheet surfaces of which is opaque and the other opaque. The opposing surface panels are attached to each other either at the edge region or at the center.

According to the invention, the porous sound-absorbing material 4a, i.e. the sound-absorbing material, is made of polyester fiber wool, the fibers of which are further treated with a post-treatment agent or agents which increase the hydrophobicity of the polyester surface. Polyester 20 already has a substantially higher or higher hydrophobicity by nature than glass wool and mineral wool base. In other words, with a clean polyester surface. . The contact angle of the water droplet ("contact angle") is quite large, whereby the water is a cause of the droplet and thus does not wet the polyester surface. Such material can also be: V water repellent. The greater the contact angle value ··: * ·· 25 the stronger or higher the hydrophobicity. In contrast, for example, the contact angle of a drop of water on a clean glass surface is again quite small, whereby the water spreads widely and wets the glass surface. The glass surface can thus be regarded as mainly a hydrated surface. The phenomenon, which is known to be the state of three states or phases, is also referred to as "wetting". Thus, the invention utilizes a sound insulation material made of polyester fiber having a water contact angle of [I ", high - i.e. poorly wetted by water - and this contact angle is further increased with suitable τ 'or suitable aftertreatment agent (s). Such a sound-absorbing material consisting of a highly hydrophobic polyester fiber, more particularly polyester fiber wool according to the invention, allows virtually any water which, for whatever reason, is forced on or in, by its own weight, to flow rapidly: ** and efficiently through. The water throughflow is made so effective that such porous sound attenuation material 4a in the first interior space V1 may be in contact with both the first metal sheet and the second metal sheet and extend within the interior to said bottom surface 6, i.e. the first metal plate 1 and the second metal plate 2 and the bottom surface 6 as well as, of course, the entire volume delimited by the upper edge 7. In particular, no air gap or air gap is required in the noise barrier 510, which has a sound absorption layer consisting of a hydrophobic polyester fiber wool according to the invention. When the intermediate space V1 of the metal surface plates 1 and 2 can be completely filled with the sound-insulating material, the same fence thickness can be improved or, alternatively, the same sound insulation can be obtained with a thinner fence. In a noise barrier 10 having a soundproofing layer consisting of a hydrophobic polyester fiber wool according to the invention, there is no need for horizontal drainage ducts at the bottom part, i.e. the bottom surface 6. Thus, it is not necessary to glue the damping material to the surface plates to leave a duct at the bottom of the fence, or to install a torn dewatering tube at the bottom of the fence to prevent the wool from falling down. The structure will become un-15 simple and effective. As for the other reasons, the upper edge 7 of the noise barrier can be operated as desired. Such a basic form of the noise barrier according to the invention, which is intended to attenuate noise M on one side, is shown in Figure 3.

A particular embodiment of the invention further comprises a third metal plate 3 provided with sound-perforating holes 11. This third metal surface plate 3 is located. . See, at least in part, a second distance S2 from the unpunched second metal sheet 2 · · · Y forming a second interior space V2. The second interior V2 has the lowest interior ·: Dividing bottom surface 6 and opposing upper edge 7, just as with the first interior ** mode V1. Further, according to the invention, the second interior space V2 is a sound-absorbing material 4b, i.e. a sound-absorbing material, and as such uses polyester fiber wool, the fibers of which are further treated with a post-treatment agent (s) to increase the hydrophobicity of the polyester surface. that is, the third metal plate 3, the second metal plate 2, and the sound damping material 4b 30 in the second interior space V2 form a structure of the same type, though of course, ·· *, necessarily identical to the first metal plate, second metal plate 2, and In the interior space V1, the third metal plate 3 and the sound-absorbing material 4b in the second interior space V2 are generally mirrored with respect to the second metal plate 2 as compared to the first metal plate 1 and the first interior space:% · φ thus, possibly the middle of the noise barrier, but at least between the sound-absorbing materials 4a and 4b, whose outer surfaces again have perforated first and third metal plates 1 and 3. Just as before the first such porous sound attenuation material 4b as discussed in relation to interior space V1 may contact both the third metal sheet and the second metal sheet and extend inside the area to said bottom surface 6, i.e., fill the volume of the third metal sheet 3 and second surface 6 and wholly. Such a further developed form of the noise barrier according to the invention is intended to attenuate the noise M on both sides, shown in Figures 1 and 2B.

10 The two-sided noise barrier 10 described above is made resistant to both thin and external loads such as pressure waves by using genuine plates as the first metal plate 1, the second metal plate 2, and the third metal plate 3a, as shown in Figures 1-2B. The waves of the corrugated plates may be trapezoidal, such as the middle metal plate 2 shown in the figures, or a sine wave, such as the first metal surface plate 1 shown in the figures, or a combination of opposite semicircular waves such as the third metal surface plate 3. Preferably, the corrugated sheets are steel sheet, for example galvanized and / or plastic coated and / or surface treated in any other desired manner. Corrugated sheets are generally known per se, so they are not described further here. The waveguides, more precisely their waveform, have a wavelength WA, WB, Wc which is perpendicular to both the generally known wavelength and the wavelength. The wavelength WB of the perforated second metal sheet 2 located between the first and second perforated metal sheet is transverse to the wavelength WA of the first metal sheet 1 and the wavelength Wc of the third metal sheet 2, as shown in FIGS. is displayed.

It is understood that the waves of the second corrugated metal sheet 2, which are not perforated, form alternating corrugated cavities Q2a and Q2b on opposite sides of the sheet, thus defined by the surface of the metal sheet and a plane or curtain surface passing through the waveforms. In this case, the Kos-30 is a double-sided noise barrier with ·· m »in the center. ··. there are effective wave cavities on both sides of the plate. Correspondingly, the waves of the first corrugated metal sheet 1 form the corrugated cavities Q1 and the waves of the second corrugated metal sheet 2 form the corrugated cavities Q2, thus defined by the surfaces of the metal plates and the planes or curtain surfaces passing through the ridges. However, these wave cavities Q1, Q2 are only on one side or inside of the plates, because these metal plates are surface plates with the opposite side or outside open to the environment. Thus, the word "corrugated" here refers specifically to the corrugated plate. The porous sound-absorbing materials 4a and 4b in the first interior space V1 and the second interior space V2 fill in one piece the cross-wave cavities Q1 and Q2a between the first and second metal sheets and the third and second metal sheets, respectively; Q3 and Q2b. In other words, the spaces between the surfaces of the first, second, and third metal sheets are substantially completely filled with sound-absorbing material. In this case, all sound-absorbing material layers of different density attached to or supported by the sound-absorbing material 4a and / or 4b and any other supporting layer or protective layer or tissue or film, etc., are considered to be sound-absorbing material 4a and 4b. In particular, all layers of polyester are part of the sound-absorbing material 10a4a and 4b.

The first metal plate 1 is secured to the second metal plate 2 from the first regions A1 of the waveform ridges 8a, 8b facing each other. Correspondingly, the third metal plate 3 is secured to the second metal plate 2 from the other areas A2 of the waveform ridges 9a, 9b facing each other 15. The metal plates 1 and 2 and the metal plates 3 and 2, respectively, are secured to one another by screws 12, rivets 13 such as pop rivets, or glue 14. The first metal plate 1 and the second metal plate 2 are spaced apart and the second metal plate 2 is spaced apart from the other regions A1 by up to 20 clearances S. This possible small clearance S is due to the preferred method of manufacturing the noise barrier according to the invention, which results in the clearance S having compressed sound-absorbing material 4a and / or 4b. Me-: ·: · * lattice can be made by stacking on top or side by side of all fence * ♦ *: algal sheet-like components, e.g. sound-absorbing materials 4a and 4b in flat-packed sheets as shown in Figure 2A. Then, when the first and: [[[the third metal sheet is compressed by force F toward each other,] the silicone material based on the polyester fiber according to the invention is interrupted by 1 · «·. ***; in the N directions of the vanes to the wave cavities Q1 and Q2a; Q3 and Q2b as it collapses from areas A1, A2 of wave paths 8a, 8b and / or 9a, 9b. This technique is based on the resilience of polyester fiber wool. This residue is made by the adhesive, rivets, or screws described above between the metal plates. It is obvious that similarly one-sided noise barriers can be made and that double-sided noise barriers can be asymmetric.

Contains at least polyvinyl alcohol and secondary alkyl sulfonate, whereby the ratio of * 'polyvinyl alcohol (PVA) to secondary alkyl sulfonate (SAS) is 30%. PVA + 70% SAS - 50% PVA + 50% SAS Preferably, the polyvinylalcohol is about 40% and the secondary alkyl sulfonate is about 60% The secondary alkyl sulfonate in the aftertreatment agent is preferably Triethanolamine C 6-20. , for example, polyfluorophosphate.

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Claims (13)

117209 g Noise barriers comprising: - at least two metal plates in the direction of the metal barrier (10), of which at least the first 5 metal plates (1) are provided with sound-perforating holes (11) and at least one metal plate (2) without holes; located at least partially at a first distance (S1) from each other to form a first interior space (V1) therebetween; - a porous sound-absorbing material (4a) in the first inner space 10 between said metal plates; - said first interior space having a bottom surface (6) and an opposite upper edge (7), characterized in that said porous sound absorbing material (4a) is made of polyester fiber wool which is in contact with the first interior space (V1) and the first metal plate (1). and a second metal sheet (2) and the fibers of which are further treated with a finishing agent or agents which increase the hydrophobicity of the polyester surface. Noise barrier according to Claim 1, characterized in that it further comprises: - a third metal plate (3) provided with a sound-transmitting reflector (11) and located at least partially at a second distance (S2) from the non-perforated second metal plate (2). forming between them a second interior space (V2) having a bottom surface (6) and an opposite upper edge (7); Said porous acoustic absorber material (4b) of said I, 25 - polyester fibrous wool, further comprising fibers treated with a finishing agent or 1 ', which increase the hydrophobicity of the polyester surface. • · • · ··· A noise barrier according to claim 1 or 2, characterized in that said porous sound-absorbing material (4a) in the first interior space (V1) extends to said bottom surface (6); and / or: - said porous sound-absorbing material (4b) in the second interior space (V2) is in contact with both the second metal plate and the third metal plate and extends in the interior space up to said bottom surface (6). • · ·: · ’35 Noise barriers according to claim 1 or 2, characterized in that f ": said first metal plate (1), said second metal plate (2) and said third metal plate (3) are corrugated plates. 7209 A barrier according to Claim 4, characterized in that the wavelength (WB) of the second perforated metal sheet (2) located between the first and second perforated metal sheet is transverse to the wavelength (Wa) of the first metal sheet (1) and 2) relative to wavelength (Wc). 5 6. A barrier according to claim 5, characterized in that the porous sound-absorbing materials (4a and 4b) in the first and second interior spaces (V1 and V2) fill in one piece with the intersecting wave cavities 10 (Q1 and Q2a) between the first and second metal sheets and the third and second metal sheets respectively. ; Q3 and Q2b). 7. A barrier according to claim 5 or 6, characterized in that the first metal plate (1) is secured to the second metal plate (2) from the first regions (A1) of wave paths (8a, 8b) facing each other, and the third metal plate (3) is attached. a second metal plate (2) from other regions (A2) of the waveform ridges (9a, 9b) facing each other. The barrier fence according to claim 7, characterized in that the first metal plate (1) and the second metal plate (2) are at most spaced from the first regions (A1) 20, and the third metal plate (3) and the second metal plate (2) respectively. are from each other (A1) at most of the clearance (S) from each other. . a; and that said clearance (S) has compressed sound-absorbing material (4a; 4b). «· * * · S« · *: 25 9. A barrier according to claim 7 or 8, characterized in that the first metal plate (1) and the second metal plate (2) and the third metal plate (3) and the second metal plate (2) respectively are fastened to one another by screws (12), rivets (13). ) or lli-bat (14). A male fence as claimed in any one of the preceding claims, characterized in that it is ···. wherein said aftertreatment of sound-absorbing polyester fiber wool comprises at least polyvinyl alcohol and a secondary alkyl sulfonate. • · · • · · front i ··· 11. A barrier agent according to claim 10, characterized in that the ratio of polyvinyl alcohol to secondary alkyl sulfonate is between 30% + 70% - ···. 50% + 50%. • i • »117209 12. A barrier material according to claim 10 or 11, characterized in that said secondary alkyl sulfonate in the treatment agent is Triethanolamine C 6-20. The non-woven fabric according to claim 10 or 11 or 12, characterized in that said after-treatment agent for polyester fiber wool further comprises a neurotransmitter; and that the neurotransmitter is polyfluorophosphate. 10