EP3150764A1 - Akustischer dämpfer fur gleise - Google Patents

Akustischer dämpfer fur gleise Download PDF

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Publication number
EP3150764A1
EP3150764A1 EP16190608.6A EP16190608A EP3150764A1 EP 3150764 A1 EP3150764 A1 EP 3150764A1 EP 16190608 A EP16190608 A EP 16190608A EP 3150764 A1 EP3150764 A1 EP 3150764A1
Authority
EP
European Patent Office
Prior art keywords
rail
acoustic attenuation
attenuation device
vibration
cavity
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.)
Granted
Application number
EP16190608.6A
Other languages
English (en)
French (fr)
Other versions
EP3150764B1 (de
Inventor
Andrea Lancia
Alessandro Lancia
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.)
PREGYMIX Srl
Original Assignee
PREGYMIX Srl
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Filing date
Publication date
Application filed by PREGYMIX Srl filed Critical PREGYMIX Srl
Publication of EP3150764A1 publication Critical patent/EP3150764A1/de
Application granted granted Critical
Publication of EP3150764B1 publication Critical patent/EP3150764B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
    • E01B19/003—Means for reducing the development or propagation of noise

Definitions

  • the present invention relates to an acoustic attenuation vibration-damping device for railways.
  • Noise pollution is a very important problem and it is particular relevant even and above all near railway lines.
  • the framework act on noise pollution N. 447 of 26 October 1995 provides the obligation to file with involved municipalities suitable plans for reducing and abating the noise caused by the passage of trains. The problem is much felt all over the world and many countries provide specific rules for reducing and abating this type of noise.
  • the object of the present invention is to intervene onto the latter component with the purpose of removing it or, at least, reducing considerably the level thereof.
  • FIGS. 1 and 2 show a perspective and section view, respectively, of a general part of a rail 100, for example a part comprised between two subsequent resting beams (not visible in figure), thereto a device 1 according to the present invention is applied.
  • the acoustic attenuation device 1 comprises a vibration-damping profile 2, having a substantially "C"-shaped cross-section, apt to be applied under said rail 100 between two subsequent resting beams, with a first contact surface 3 facing a base surface 4 of said rail 100.
  • the device 1 further comprises a closure plate 20 defining a cavity 5 internal to the vibration-damping profile 2.
  • anchoring means 30, 31 The device is fixed to the rail by means of anchoring means 30, 31.
  • anchoring means comprises two "C"-shaped locking flanges (30), preferably made of stainless steel, allowing to fix rigidly the device at side edges of the base of the rail 100 by means of suitable self-threading screws (31) which engage into the body of the vibration-damping profile 2.
  • the upper edges of the locking flanges 30 advantageously can be coated with a gasket made of rubber 32 which has the double function of improving the adherence of the flanges to the base of the rail and to prevent possible vibrations thereof.
  • the device implements a complex box-like structure (see Figure 1 ), which is to be applied in the lower portion of the rail in the parts comprised between subsequent beams.
  • the main component of the system is constituted by the vibration-damping profile 2 made of rubber with "C"-like section, made of polymeric substance, preferably of recycled rubber and, still preferably comprising non-vulcanized elastomeric granules with varied granulometry.
  • the rubber used in the production of the vibration-damping profile 2 then can derive from a recycling process and, in turn, it can be recycled; the life cycle of the product is then wholly environmentally friendly.
  • it comprises granules of different and non-vulcanized elastomers, it has the advantage of absorbing effectively the kinetic energy produced by the rail vibrations.
  • the closure plate 20 advantageously can have a plurality of holes 21.
  • such holes can be made with various diameters, tuned with the different frequencies to be attenuated.
  • the holes can have diameters varying from 0.3 mm and 0.8 mm.
  • the closure plate 20 by closing the structure of the device, implements an acoustic cavity 5.
  • the plate is capable of breaking the sound wavefront, absorbing and keeping inside the cavity 5 a portion of the sound energy and dissipating the remaining portion thereof outside.
  • the described elements are applied in the space between the beams under the rail, thereto they are fixed rigidly by means of the locking flanges made of steel.
  • the device typically can be produced in elements with length equal to the free space usually existing between two subsequent beams (typically variable between 30 cm and 40 cm) and with width substantially equal to the width of the base surface of a rail (typically equal to about 20 cm).
  • the mechanical features of the polymeric substance give the profile enough stiffness to absorb mechanical energy from the rail and at the same time adequate capability of shaping and adhering perfectly to the lower surface of the rail itself.
  • the subsequent figures 3 to 5 relate to a second and preferred embodiment of the present invention, by showing a perspective, section and exploded view, respectively, of a part of rail thereto a device 101 according to the present invention is applied.
  • a device 101 apart from what already described in relation to the first embodiment, comprises an intermediate element 6 apt to absorb at least a portion of the mechanical energy originated by the rail 100, arranged internal to the cavity 5.
  • such intermediate element 6 comprises a dampening layer 7, made of a material apt to absorb vibrations, interposed between a first and a second layer made of metallic material, respectively designated with numbers 8 and 9 in figure.
  • the first metallic layer 8 is implemented like a plate made of steel capable of giving more stiffness to the contact surface between rail and vibration-damping profile, so as to improve the capability of absorbing the mechanical energy originated by the rail and to discharge at least a portion thereof, by vibrating.
  • the dampening layer 7 constitutes a thickness of insulating material, preferably made of rubber, with function of dampening vibrations and partially absorbing the sound energy.
  • the second metallic layer 9 is implemented as a second metallic layer, analogous, for shape and sizes, to the first plate 8, but with the main function of discharging, by vibrating, the mechanical energy transmitted by the rail.
  • the thickness of insulating material made of rubber ( Figure 1 , d), interposed between the two plates of steel, has the function of dampening the vibrations induced onto the two plates made of steel, absorbing a portion of the sound energy and contributing, however, to break the sound wavefront.
  • the device 101 further comprises a sound-deadening element 10 placed inside said cavity 5.
  • the sound-deadening element 10 has the function of receiving the energy transmitted by the vibration of the plate 9. It has a high sound absorption coefficient and then contributes to keep the sound energy inside the cavity 5.
  • the sound-deadening element 10 can comprise a layer made of polyester fibre, preferably with a thickness so as to fill-in the cavity 5.
  • the first plate 8 improves the stiffness coefficient of the "C"-like element and it then increases the capability thereof of absorbing mechanical energy from the rail; it further guarantees, by vibrating, the function of partial discharging the sound energy.
  • the second metallic layer 9 guarantees both a partial discharge of the sound energy and a better transfer of the mechanical energy to the subsequent layer of sound-deadening material.
  • the above-mentioned components are kept together by the fastening screws 31, which do not prevent the metallic plates from vibrating and absorbing the mechanical energy, which then will be partially absorbed by the dampening and/or sound-deadening elements, and partially transferred outside.
  • the production process of the system is simple and the materials can be easily found on the market.
  • the vibration-damping structural profile made of rubber, for example, can be produced by moulding with injection press.
  • the present invention has been sofar described by referring to preferred embodiments thereof. It is to be meant that the technical solutions implemented in the preferred embodiments, herein described by way of example, could advantageously be combined differently therebetween, to create other embodiments belonging to the same inventive core and however all within the protection scope of the herebelow reported claims.
EP16190608.6A 2015-09-30 2016-09-26 Akustischer dämpfer fur gleise Not-in-force EP3150764B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUB2015A004061A ITUB20154061A1 (it) 2015-09-30 2015-09-30 Dispositivo di attenuazione acustica sotto-rotaia

Publications (2)

Publication Number Publication Date
EP3150764A1 true EP3150764A1 (de) 2017-04-05
EP3150764B1 EP3150764B1 (de) 2019-04-10

Family

ID=55085782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16190608.6A Not-in-force EP3150764B1 (de) 2015-09-30 2016-09-26 Akustischer dämpfer fur gleise

Country Status (2)

Country Link
EP (1) EP3150764B1 (de)
IT (1) ITUB20154061A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112030616A (zh) * 2020-07-21 2020-12-04 中南大学 一种基于共振原理的减振发电轨枕
CN112195690A (zh) * 2020-10-29 2021-01-08 中国铁建投资集团有限公司 隔离式减震垫的铺设方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0222277A1 (de) * 1985-11-13 1987-05-20 Hermann Ortwein Elastisch gelagerte Schiene für Schienenfahrzeuge
DE3722439A1 (de) * 1987-07-07 1987-12-23 Schwartz Heinz Vorrichtung zur reduzierung von schallenergie am verkehrssystem rad/schiene
DE3834329A1 (de) * 1987-10-10 1989-04-27 Phoenix Ag Schienenlager
EP1443148B1 (de) * 2003-01-23 2007-05-09 ThyssenKrupp GfT Gleistechnik GmbH Strassenbahnschienenanordnung
WO2015003634A1 (zh) * 2013-07-10 2015-01-15 铁道第三勘察设计院集团有限公司 一种轨道吸振器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0222277A1 (de) * 1985-11-13 1987-05-20 Hermann Ortwein Elastisch gelagerte Schiene für Schienenfahrzeuge
DE3722439A1 (de) * 1987-07-07 1987-12-23 Schwartz Heinz Vorrichtung zur reduzierung von schallenergie am verkehrssystem rad/schiene
DE3834329A1 (de) * 1987-10-10 1989-04-27 Phoenix Ag Schienenlager
EP1443148B1 (de) * 2003-01-23 2007-05-09 ThyssenKrupp GfT Gleistechnik GmbH Strassenbahnschienenanordnung
WO2015003634A1 (zh) * 2013-07-10 2015-01-15 铁道第三勘察设计院集团有限公司 一种轨道吸振器

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112030616A (zh) * 2020-07-21 2020-12-04 中南大学 一种基于共振原理的减振发电轨枕
CN112030616B (zh) * 2020-07-21 2021-08-24 中南大学 一种基于共振原理的减振发电轨枕
CN112195690A (zh) * 2020-10-29 2021-01-08 中国铁建投资集团有限公司 隔离式减震垫的铺设方法

Also Published As

Publication number Publication date
EP3150764B1 (de) 2019-04-10
ITUB20154061A1 (it) 2017-03-30

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