EP4276244A1 - Akustische barrierevorrichtung und akustische barriere für eisenbahnstrecken - Google Patents

Akustische barrierevorrichtung und akustische barriere für eisenbahnstrecken Download PDF

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Publication number
EP4276244A1
EP4276244A1 EP22382457.4A EP22382457A EP4276244A1 EP 4276244 A1 EP4276244 A1 EP 4276244A1 EP 22382457 A EP22382457 A EP 22382457A EP 4276244 A1 EP4276244 A1 EP 4276244A1
Authority
EP
European Patent Office
Prior art keywords
cover plate
sound
support body
acoustic barrier
acoustic
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Withdrawn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
EP22382457.4A
Other languages
English (en)
French (fr)
Inventor
Manuel VÁZQUEZ SUAREZ
Itziar ASPURU SOLOAGA
Álvaro SANTANDER PANTIOSO
Pilar FERNÁNDEZ ALCALÁ
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.)
Acustrain SL
Original Assignee
Acustrain SL
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 Acustrain SL filed Critical Acustrain SL
Priority to EP22382457.4A priority Critical patent/EP4276244A1/de
Priority to PCT/EP2023/062424 priority patent/WO2023217862A1/en
Publication of EP4276244A1 publication Critical patent/EP4276244A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • E01F8/0064—Perforated plate or mesh, e.g. as wall facing
    • E01F8/007—Perforated plate or mesh, e.g. as wall facing with damping material

Definitions

  • the present invention relates to acoustic barriers for railway lines that are positioned alongside the railway lines to reduce noise generated by a railway vehicle travelling on rails, to the environment near a railway line.
  • Railways are considered an environmental-friendly collective transport medium.
  • travelling railway vehicles generate noise, for example, due to the contact of the rotating wheels of the railway vehicles with the rails, vibrations of parts of the vehicles located at its lower portion and vibrations of the railway structure itself (e.g. rails, sleepers, ballast), which is considered acoustic pollution, especially in urban areas where the noise is felt particularly disturbing and may even lead to health problems at the medium to long term.
  • noise for example, due to the contact of the rotating wheels of the railway vehicles with the rails, vibrations of parts of the vehicles located at its lower portion and vibrations of the railway structure itself (e.g. rails, sleepers, ballast), which is considered acoustic pollution, especially in urban areas where the noise is felt particularly disturbing and may even lead to health problems at the medium to long term.
  • acoustic barriers To mitigate noise pollution caused by railway traffic, acoustic barriers have been developed.
  • the most common acoustic barriers are tall acoustic walls of a height of more than three meters which are comprised of contiguous modular wall devices placed alongside the railway lines.
  • the tall acoustic walls deflect upwards the noise generated by the travelling vehicle and attenuate the noise level emitted towards areas adjacent to the railway line from said noise.
  • these tall acoustic walls are disadvantageous inasmuch their installation requires e.g. providing strong foundations, occupying specific strips of land placement at a distance from the track bed which is sufficient to comply with legal regulations, relatively complex structures to provide sufficient stability and robustness.
  • the tall acoustic walls cause a negative visual impact as they obstruct the horizontal visibility of landscapes and building located at the other side.
  • EP1355006A1 discloses an acoustic barrier device of low height for railway lines which is shaped as a tile which, in its cross section, is tapered from its base towards its free and which has a concave rounded surface facing the railway line.
  • the tile-shaped acoustic barrier device disclosed in EP1355006A1 has a core filled with sound-absorbing material and an outer shell enveloping the core and it is fixed to the flange of the rails of the railways line by means of connecting plates.
  • a first aspect of the invention relates to an acoustic barrier device for railway lines which overcomes drawbacks and inconveniences of prior art acoustic barriers.
  • a second aspect of the invention relates to an acoustic barrier device for railway lines, comprising a support body comprising a vertical wall designed to face a railway line and at least one anchoring member for anchoring the support body alongside the railway line, which is designed to attenuate noise which is generated at the lower portion of the railway vehicle by the contact of the rotating wheels of the railway vehicle with the rails, vibrations of parts of the vehicle located at its lower portion and vibrations of the railway structure itself, by absorbing and deflecting sound waves such that they are spread mainly upwards along a sound path.
  • a third aspect of the invention relates to an acoustic barrier device which is easy to manufacture and easy to maintain and replace.
  • a fourth aspect of the invention relates to an acoustic barrier device having a reduced height allowing it to be installed proximate to the railway line at the same time that it does not substantially affect the visual appearance of the railway line.
  • a fifth aspect of the invention relates to an acoustic barrier device which may be installed to comply with legal requirements which allow the presence of auxiliary device in the track bed only up to predetermined heights.
  • a sixth aspect of the invention relates to an acoustic barrier for a railway line comprising a plurality of adjacent acoustic barrier devices complying one or more of the previously recited aspects.
  • the acoustic barrier device for railway lines comprises a support body comprising a vertical wall designed to face a railway line, at least one anchoring member for anchoring the support body to a track bed alongside the railway line, and sound dampening means to attenuate noise which is generated at the lower portion of the railway vehicle by the contact of the rotating wheels of the railway vehicle with the rails.
  • the sound dampening means comprises a cover plate with a plurality of through holes fixed to the support body, and at least one sound-absorbing sheet positioned between the vertical wall and the cover plate.
  • the cover plate and the sound absorbing sheet are preferably rectangular in shape.
  • the cover plate is preferably made of concrete and more preferably of a concrete having a density of at least 2000 kg/m 3 . In some embodiments the cover plate has a width between 50mm and 100mm.
  • the through holes are evenly distributed in the cover plate and occupy at least 40% of cover plate.
  • the through holes may have the cross section of a rectangle with rounded corners.
  • each of the through holes comprises a longitudinal axis which is oblique with respect to the vertical axis of the cover plate.
  • the through holes have a depth between 50 and 100 mm allowing the passage of a wide range of acoustic waves.
  • their depth 50 to 100 mm makes them act as the neck of a Helmholtz resonator depending on the thickness of the neck of the holes and the cavity space behind it, to combine it with the effect of perforated panels with chamber and absorbing material that allows to expand the effect of the resonance frequencies.
  • the holes in the cover plate allow noise to pass through to the sound absorbing foil so that behind the cover plate, reflections between the vertical wall of the support body of the mini-barrier and the cover plate are reduced and the noise levels coming through the holes themselves to the outside are again minimized allowing the desired absorption rate to be obtained.
  • the support body comprises a recessed surface defining a housing with a depth between 4 and 7 mm where the sound absorbing sheet is placed.
  • the sound absorbing sheet can be made of a sound-absorbing material with an absorption index a w greater than 0.8, for example mineral wool or glass fiber and a sound-absorbing DLalfa coefficient of at least 10 dBA according to UNE EN 1793.1. in the frequency range object of the study (100 Hz and 10 KHz).
  • the waves passing through the through holes are partly absorbed by this sound absorbing material.
  • the combined effect of the absorption in the recessed surface with the acoustic performance of the through holes of great depth (50 to 100 mm of depth) of the cover plate and the resonances in the holes allow to provide the acoustic barrier device with an acoustic isolation capacity DLr greater than 24 dB and an acoustic absorption capacity DLalfa higher than 4 dB according to UNE EN 1793.1. in the frequency range object of the study (100 Hz and 10 KHz).
  • the support body has a width greater than 0.15 m not allowing the noise to pass through the barrier and to produce a reverberant effect between the cover plate and the support body.
  • This support body can be manufactured in any material with an insulation higher than 30 dB (UNE 1793.2) and preferably made of concrete and more preferably of a concrete having a density of at least 2000 kg/m 3 .
  • the acoustic barrier device may further comprise coupling members to couple it to at least an adjacent barrier device.
  • the coupling members may be metal plates screwed to adjacent acoustic barrier devices at the backside of each acoustic barrier device.
  • the height of the support body when installed on a track bed is lower than 1.5 m.
  • the support body may advantageously comprise a bottom portion which is thicker than the vertical wall, and which protrudes behind from the vertical wall in a horizontal direction opposite to the support surface of the vertical wall.
  • the bottom portion provides a low center of gravity to the acoustic barrier device as well enough space to allow placing the anchor members.
  • the support surface comprises a rectangular recessed surface formed in the vertical wall surrounded by a rectangular frame formed by peripheral wall portions of the vertical wall.
  • the recessed surface is dimensioned to receive the sound absorbing sheet.
  • the rectangular recessed surface may comprise at least one partition wall extending vertically through the rectangular recessed surface such that each partition wall divides the recessed surface into two cavities, each for receiving one sound absorbing sheet. This allows to accurately place various sound absorbing sheets in the cavity provided by the recessed surface and the cover plate, and to replace only one sound absorbing sheet which has become deteriorated instead of a whole long single sheet.
  • the barrier device comprises an overhang at the top edges of the vertical wall of the support body and the cover plate, and which horizontally extends beyond the top edge of the cover plate.
  • the overhang can also be chamfered at 30° to 45° with respect to the horizontal.
  • the overhang generates a reverberant space formed by the barrier, the train and the support structure (platform or ballast). Acoustic waves are reflected between the train and the barrier device creating a reverberant space.
  • the overhang generates an acoustic diffraction effect when the waves leaving the reverberation chamber meet the edges of overhang. At these points of "collision” the wave breaks generating another wave train of lower intensity that acts with the previous one attenuating the noise that is transmitted to the environment.
  • the upper surface of the overhang can be flat with two diffraction axes.
  • the overhang comprises a non-flat geometry (to have more surface area) and thus more than two diffraction points.
  • the overhang can also comprise different materials that provide acoustic absorption, which in combination improves the effect of the barrier device.
  • the overhang may be formed by a top portion of the vertical wall of the support body, a top portion of the cover plate or by a separate cover member fixed to the top edges of the vertical wall and the cover plate.
  • the cover member may be removable such that, when it is removed, easy access to the sound absorbing sheet is possible and extraction thereof may be performed in an easy manner.
  • the overhang When the overhang is a top portion of the vertical wall of the support body or when the overhang is a separate cover member fixed to the top edges of the vertical wall and the cover plate, the overhang may comprise a lower axial recess dimensioned to receive the top edge of the cover plate.
  • the acoustic barrier for a railway line comprises a plurality of adjacent acoustic barrier devices comprising one or more features of the above described acoustic barrier device.
  • the acoustic barrier devices may be coupled to each other by coupling members and to the track bed of the railway line by anchoring members coupling only some of the acoustic barrier devices.
  • Figure 1 shows a railway vehicle -10- traveling on rails -11a- of a railway line -11- and an acoustic barrier device -1-.
  • the acoustic barrier device -1- is anchored to the track bed -11c- in a manner known per se which may be conventional ballast -11d-.
  • the acoustic barrier device -1- may be anchored to an anchor element, such as a conventional concrete plate or concrete block (not shown in the figures) in the track bed -11c-, in a manner also known per se in the art.
  • Noise generated at the lower portion of the railway vehicle -10- for example, by the contact of the rotating wheels of the railway vehicle -10- with the rails, vibrations of parts of the vehicle located at its lower portion and vibrations of the railway structure itself (e.g. rails, sleeper, ballast), is attenuated and sound waves are deflected by the presence of the acoustic barrier device -1- in an reverberation area -RA- to travel upwards in a sound path -SP-.
  • the structure and materials of the acoustic barrier device -1- is designed to provide an acoustic isolation capacity DLr greater than 24 dB and an acoustic absorption capacity DLalfa greater than 4 dBA.
  • the acoustic barrier device -1- comprises a support body -2- comprising a wall -2a-, and a sound dampening means comprising a rectangular cover plate -3- with a plurality of through holes -3a- fixed to the support body -2-, and at least one rectangular sound absorbing sheet -4- positioned between a surface -2b- of the wall -2a- and the cover plate -3-.
  • the sound dampening means are arranged on the wall -2- of the support body -2- to face the railway line -11-.
  • the through holes -3a- are evenly distributed in the cover plate -3- and occupy at least 40% of cover plate -3- and have a cross section of a rectangle with rounded corners.
  • each of the through holes -3a- comprises a longitudinal axis -L- which is oblique with respect to the vertical axis -V- of the cover plate -3-.
  • the acoustic barrier device -1- comprises coupling members to couple it to at least an adjacent barrier device -1-.
  • the support surface is a rectangular recessed surface -2b- formed in the vertical wall -2a- surrounded by a rectangular frame formed by peripheral wall portions -2c- of the vertical wall -2a-, the recessed surface -2b- being dimensioned to receive the sound absorbing sheet -4-.
  • the rectangular recessed surface -2b- comprises at least one partition wall -2d- extending vertically through the rectangular recessed surface -2b-, such that each partition wall -2d- divides the recessed surface -2b- into two cavities, each for receiving one sound absorbing sheet -4-.
  • the sound absorbing sheet -4- is made of a sound absorbing material such that the sound absorbing sheet -4- has a sound absorbing DLalfa coefficient of at least 10 dBA at a sheet thickness of 7 cm. At least a surface facing the cover plate -3- of the sound absorbing sheet -4- is covered by a sound-permeable protector sheet -9- ( figure 18 ) to protect the sound absorbing sheet -4- against environmental conditions and foreign agents.
  • the protector sheet -8- may be designed to envelope the whole sound absorbing sheet -4-.
  • Figures 3 , 6 , 10 , 12 , 14 and 18 show that the support body -2- comprises a bottom portion -2e- which is thicker than the vertical wall -2a-, and which protrudes behind from the vertical wall -2a- in a horizontal direction opposite to the support surface of the vertical wall -2a-.
  • the barrier device -1- comprises an overhang -5- at the top edges -2f, 3b- of the vertical wall -2a- and the cover plate -3-, and which horizontally extends beyond the top edge -3b- of the cover plate -3-.
  • the overhang -5- is formed by a top portion of the vertical wall -2a- of the support body -2-, comprises a lower axial recess -7- dimensioned to receive the top edge -3b- of the cover plate -3-.
  • the overhang -5- is formed by a top portion of the cover plate -3- and comprises a free rim portion -5a- and a deflector wall -6- vertically extending upwards from the rim portion -5a-.
  • the top edge -2f- of the vertical wall -2a- and the top edge -3b- of the cover plate -3- are fitted together by a separate cover member -8-.
  • the overhang -5- may be formed by the separate cover member -8- fixed to the top edges -2f, 3b- of the vertical wall -2a- and the cover plate -3-.
  • the afore-described acoustic barrier device -1- may be dimensioned as follows:
  • Figure 20 shows an acoustic barrier for a railway line -11-, wherein the acoustic barrier -12- comprises a plurality of adjacent acoustic barrier devices -1- having one or more of the properties of the above described acoustic barrier device -1-.
  • the acoustic barrier devices -1- are coupled to each other by coupling members and to the track bed of the railway line -11- by anchoring members (not shown in figure 20 ).
  • Figure 21 shows the acoustic waves reflected between the train and the barrier device.
  • Figure 22 shows the acoustic diffraction effect when the waves leaving the reverberation chamber meet the edges of overhang when the upper surface of the overhang - 5- is flat.
  • the overhang -5- can comprise a non-flat upper surface with different geometries - 51, 52, 53, 54- and thus having more than two diffraction axes.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
EP22382457.4A 2022-05-11 2022-05-11 Akustische barrierevorrichtung und akustische barriere für eisenbahnstrecken Withdrawn EP4276244A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22382457.4A EP4276244A1 (de) 2022-05-11 2022-05-11 Akustische barrierevorrichtung und akustische barriere für eisenbahnstrecken
PCT/EP2023/062424 WO2023217862A1 (en) 2022-05-11 2023-05-10 Acoustic barrier device and acoustic barrier for railway lines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22382457.4A EP4276244A1 (de) 2022-05-11 2022-05-11 Akustische barrierevorrichtung und akustische barriere für eisenbahnstrecken

Publications (1)

Publication Number Publication Date
EP4276244A1 true EP4276244A1 (de) 2023-11-15

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EP22382457.4A Withdrawn EP4276244A1 (de) 2022-05-11 2022-05-11 Akustische barrierevorrichtung und akustische barriere für eisenbahnstrecken

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EP (1) EP4276244A1 (de)
WO (1) WO2023217862A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2649132A1 (de) * 1976-10-28 1978-05-03 Albert Stewing Laermschutzwand
BE892899A (fr) * 1982-04-19 1982-08-16 Cbr Cementbedrijven Nv Ecran acoustique
FR2612217A1 (fr) * 1987-03-13 1988-09-16 Rousset Michel Ecrans anti-bruit en elements prefabriques
EP1355006A1 (de) 2002-04-08 2003-10-22 F.lli Dematteis S.r.l. Schalldämmungspaneel für Eisenbahnlinien
IT201700006516A1 (it) * 2017-01-23 2018-07-23 Pregymix S R L Dispositivo fonoisolante prefabbricato per la realizzazione di recinzioni ferroviarie

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2649132A1 (de) * 1976-10-28 1978-05-03 Albert Stewing Laermschutzwand
BE892899A (fr) * 1982-04-19 1982-08-16 Cbr Cementbedrijven Nv Ecran acoustique
FR2612217A1 (fr) * 1987-03-13 1988-09-16 Rousset Michel Ecrans anti-bruit en elements prefabriques
EP1355006A1 (de) 2002-04-08 2003-10-22 F.lli Dematteis S.r.l. Schalldämmungspaneel für Eisenbahnlinien
IT201700006516A1 (it) * 2017-01-23 2018-07-23 Pregymix S R L Dispositivo fonoisolante prefabbricato per la realizzazione di recinzioni ferroviarie

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WO2023217862A1 (en) 2023-11-16

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