EP2570552A2 - Elément d'absorption acoustique pour des barièrres à abattement de bruit - Google Patents

Elément d'absorption acoustique pour des barièrres à abattement de bruit Download PDF

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Publication number
EP2570552A2
EP2570552A2 EP12184053A EP12184053A EP2570552A2 EP 2570552 A2 EP2570552 A2 EP 2570552A2 EP 12184053 A EP12184053 A EP 12184053A EP 12184053 A EP12184053 A EP 12184053A EP 2570552 A2 EP2570552 A2 EP 2570552A2
Authority
EP
European Patent Office
Prior art keywords
sound
noise abatement
absorbing element
axis
sheet
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Withdrawn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
EP12184053A
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German (de)
English (en)
Other versions
EP2570552A3 (fr
Inventor
Carolina Parenti
Nicola Parenti
Leonardo Maffi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2570552A2 publication Critical patent/EP2570552A2/fr
Publication of EP2570552A3 publication Critical patent/EP2570552A3/fr
Withdrawn legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
    • E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
    • E01F8/0047—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with open cavities, e.g. for covering sunken roads
    • E01F8/0052—Grate-style, e.g. as wall facing
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
    • E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
    • E01F8/0029—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with porous surfaces, e.g. concrete with porous fillers

Definitions

  • the present invention relates to a sound-absorbing element for noise abatement barriers. More in particular, the invention relates to an element for coating sound-absorbing panels used for making road, motorway and similar noise abatement barriers.
  • noise abatement barriers are increasingly used which are placed at the sides of the road in the stretches in the proximity of built-up or residential areas.
  • these barriers consist of prefab panels which may be of different shapes and types.
  • a highly widespread type consists of panels made of concrete coated with a plurality of sound-absorbing elements.
  • These elements generally consist of a sheet made of concrete, granulate or similar material, wherein the face facing the road stretch, i.e. that exposed to sound waves, is provided with a plurality of projections such as to define as many cavities or chambers thereinbetween, wherein a share portion of the incident sound energy is gradually deadened.
  • the deadening or absorbing effect of the sound wave energy is a function, among the others, of the dimensions of these cavities the effectiveness whereof, according to the theory of Helmholtz resonators, also depends on the wavelength of the sound to be deadened.
  • elements are known, the surface whereof has a plurality of side by side rectilinear notches or grooves having a decreasing section towards the interior of the element.
  • An element for sound-absorbing panels is also known from Italian patent N. 1372790 by the same applicant which on one side has a series of grooves with undercuts adapted to define a series of cavities (Helmholtz resonators) accessible by as many notches provided on the exposed outer face of the element.
  • Italian patent N. 1372790 by the same applicant which on one side has a series of grooves with undercuts adapted to define a series of cavities (Helmholtz resonators) accessible by as many notches provided on the exposed outer face of the element.
  • the object of the present invention is to propose a sound-absorbing element for noise abatement barriers which overcomes the drawbacks of the prior art.
  • Another object of the present invention is to provide a sound-absorbing element for noise abatement barriers which is lighter and allows the use of undersized support structures compared to known ones.
  • a sound-absorbing element for noise abatement barriers comprising a sheet with a first portion and a second portion lying one over the other, a plurality of tubular cavities in said second portion being arranged along at least one axis substantially parallel to a plane on which the element lies, at least one side perpendicular to said axis being shaped so that between two elements placed side by side along the axis there is a chamber designed to receive a portion of the sound waves coming to bear on the surface, such that said waves are able to spread through said tubular cavities.
  • Said sheet comprises a first portion 3 and a second portion 4 lying one over the other along a direction perpendicular to a plane G where the element lies on a panel P of a noise abatement barrier B ( figures 5 and 6 ).
  • said second portion is provided with one or more tubular cavities 5 arranged along at least one axis X substantially parallel to said plane where the element lies.
  • tubular cavities 5 extend between two opposite sides 4' and 4", of the second portion 4 of sheet 2, perpendicular to said axis X.
  • tubular cavities 5 are through and are provided with a first opening 5' arranged at a first side 4' of the second portion 4 of sheet 2, and with a second opening 5" arranged at a second opposite side 4" of said second portion 4 of sheet 2 ( fig. 3 ).
  • said tubular cavities 5 are configured for trapping the sound waves which, bouncing on the inner walls of said cavity, increasingly lose a part of their energy which is absorbed by the material.
  • At least one side of sheet 2 perpendicular to axis X is configured so that between two side by side elements along said axis there is a chamber 7 adapted to receive a portion of the sound waves directed towards the surface and allow the spreading thereof within said tubular cavities 5.
  • the first portion 3 of sheet 2 is provided, on at least one side 3' perpendicular to said axis X, with a projecting ledge 6 so as to keep the second portions 4 of two adjacent elements on the panel spaced apart, as shown in figure 5 .
  • said ledge 6 allows the first side 4' of one element to be kept spaced apart from a second opposite side 4" of an adjacent element along a direction parallel to axis X.
  • a chamber 7 is therefore defined between a first side 4' of a second portion of one element and a second side 4" of a second portion 2 of an adjacent element, adapted to receive a portion of the sound waves directed towards the exposed outer surface 8 of the second portion 4 of sheet 2.
  • the sound waves can spread into the tubular cavities 5 where, reflecting multiple times on the inner walls, they lose a part of their energy which is dispersed in the material.
  • a front edge 9 of ledge 6 is provided with a bevel which defines an inclined wall 10 arranged on the bottom of chamber 7.
  • the size of chamber 7 affects the capability of the same to trap a part of the sound waves directed towards the outer surface 8 of the element.
  • sides 4' and 4" are arranged substantially parallel to each other at a distance D.
  • a value of distance D corresponding to the height of ledge 6, which ensures good sound-absorbing performance, is in the range between 5 mm and 50 mm. According to some tests carried out by the applicant, maximum performance is achieved with a distance D of 15 mm.
  • angle a of the bottom wall 10 of chamber 7 affects the percentage of waves reflected within cavities 5.
  • An angle a which ensures good sound-absorbing performance is in the range between 40° and 70° of inclination relative to the plane G where the element lies on panel P.
  • At least one side 4' of the second portion 4 of the sheet is inclined relative to the lying plane G so as to create chamber 7.
  • first side 4' of one element and side 4" of an adjacent element are diverging from each other.
  • side 4" is substantially perpendicular to the lying plane G whereas the first side 4' is inclined by an angle b equal to or smaller than 90°.
  • said angle b is in the range between 45 ° and 90°.
  • both sides 4' and 4" may be inclined so as to be diverging and thus create chamber 7 which allows the sound waves to propagate within cavities 5.
  • the angle comprised between sides 4' and 4" of two adjacent elements is in the range between 0 and 45°.
  • an even further embodiment can be provided with both a ledge 6 on at least one of sides 3' of the first portion of the sheet, and at least one side 4' of the second portion 4 inclined by an angle b relative to the lying plane G.
  • the tubular cavities 5, according to the invention preferably have a constant trapezoid or triangular shaped section.
  • the pair of converging walls 12 (the trapezium or triangle sides), in fact, allows the wavelength field whereat cavities 5 produce an actual deadening effect to be widened.
  • said outer surface 8 has a plurality of first grooves 13 extending from the first side 4' to the second opposite side 4" of the second portion 4 of sheet 2.
  • said grooves allow the extension of the outer surface 8 to be increased, and on the other hand they allow the creation of further cavities wherein the sound waves reflect on their walls, dissipating a part of their energy.
  • the depth of said first grooves preferably substantially coincides with the thickness of the second portion 4 of sheet 2.
  • said first grooves are interposed between one tubular cavity 5 and a consecutive one.
  • further second grooves 14 are provided on the outer surface 8 with smaller dimensions, in particular depth, compared to the first ones.
  • recesses 16 with undercuts, in particular shaped as a dovetail, adapted to improve the grip of the concrete layer 17 that is interposed between the element and panel P.
  • the element thus configured ensures the maximum sound-absorbing class A4 even using less precious and expensive materials, such as foamed clay.
  • the panel may in any case be made of concrete mixed with other suitable materials such as wood, recycled plastic fragments, pebble, etc.
  • the elements requires a smaller volume of material with the same surface compared to known elements with a further saving in terms of money and weight.
EP12184053.2A 2011-09-13 2012-09-12 Elément d'absorption acoustique pour des barièrres à abattement de bruit Withdrawn EP2570552A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000021A ITPC20110021A1 (it) 2011-09-13 2011-09-13 Blocco fonoassorbente per barriere antirumore

Publications (2)

Publication Number Publication Date
EP2570552A2 true EP2570552A2 (fr) 2013-03-20
EP2570552A3 EP2570552A3 (fr) 2015-07-22

Family

ID=44936398

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12184053.2A Withdrawn EP2570552A3 (fr) 2011-09-13 2012-09-12 Elément d'absorption acoustique pour des barièrres à abattement de bruit

Country Status (2)

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EP (1) EP2570552A3 (fr)
IT (1) ITPC20110021A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2679170C1 (ru) * 2017-08-21 2019-02-06 Татьяна Анатольевна Финоченко Шумозащитный экран

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1372790A2 (fr) 2001-03-29 2004-01-02 Kidde IP Holdings Limited Extinction d'incendie ou d'explosion

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3827144A1 (de) * 1988-08-10 1990-02-15 Ulrich Dipl Ing Gerstner Schallabsorbierendes bauteil
CH678870A5 (fr) * 1988-09-16 1991-11-15 Hunziker & Cie Ag
ITPC20060023A1 (it) * 2006-04-24 2007-10-25 Paver Spa Blocco per pannelli fonoassorbenti e relativo metodo di produzione

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1372790A2 (fr) 2001-03-29 2004-01-02 Kidde IP Holdings Limited Extinction d'incendie ou d'explosion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2679170C1 (ru) * 2017-08-21 2019-02-06 Татьяна Анатольевна Финоченко Шумозащитный экран

Also Published As

Publication number Publication date
EP2570552A3 (fr) 2015-07-22
ITPC20110021A1 (it) 2013-03-14

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