EP0744496B1 - Noise reducer for wayside acoustical barriers - Google Patents

Noise reducer for wayside acoustical barriers Download PDF

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Publication number
EP0744496B1
EP0744496B1 EP96201207A EP96201207A EP0744496B1 EP 0744496 B1 EP0744496 B1 EP 0744496B1 EP 96201207 A EP96201207 A EP 96201207A EP 96201207 A EP96201207 A EP 96201207A EP 0744496 B1 EP0744496 B1 EP 0744496B1
Authority
EP
European Patent Office
Prior art keywords
noise reducer
pans
barrier
shell
shells
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.)
Expired - Lifetime
Application number
EP96201207A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0744496A1 (en
Inventor
Francesco Baroglio
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.)
GRUPPO RUSCALLA S.P.A.
Original Assignee
TUBOSIDER ITALIANA SpA
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Filing date
Publication date
Application filed by TUBOSIDER ITALIANA SpA filed Critical TUBOSIDER ITALIANA SpA
Publication of EP0744496A1 publication Critical patent/EP0744496A1/en
Application granted granted Critical
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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
    • 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
    • E01F8/0035—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with undulated surfaces

Definitions

  • This invention is concerned with a noise reducer for acoustical barriers, particularly for protecting dwelling areas from noise coming from highways and railways, although it can be applied for protection from noise generated in industrial yards, quarries, and the like.
  • Acoustical barriers as presently installed along urban and suburban stretches of highways or the like generally comprise panels of porous concrete or other material, which are erected to form a wall on the side of the highway, which wall partly absorbs and partly reflects the acoustical waves generated by the vehicles in transit.
  • the purpose of such barriers is eliminate or at least attenuate the noise level, or "acoustical pollution", which otherwise would reach the houses placed along the highway, propagating as a spherical acoustical wave from its source, i.e. from the passing vehicle, which is typically only slightly above the highway ground.
  • the barrier In order to provide an effective protection, the barrier should therefore extend upwardly to a height intercepting an imaginary line connecting the pavement of the highway to the highest stories of the buildings behind the barrier; the wave diffraction beyond the barrier edge is here disregarded. It is evident that, if buildings have four or five stories or more, the barrier should be several meters tall, say 8 to 10 meters or more, with unacceptable associated costs, and with an unpleasant impact on the environment.
  • acoustical barriers are mostly erected in heights not exceeding 2 to 3 meters, thus accepting an acoustical protection which is limited to the lower stories of the buildings which should be protected.
  • barriers which comprise a fence or wall having a sound-absorbing member arranged on its top.
  • EP-A-0 315 710 describes a sound-absorbing pipe to be fastened along the top of fences or side walls, and comprising a tubular, cylindrical member having a reticular wall and enclosing a lining of sound-absorbing material such as rock wool.
  • EP-A-0 560 200 describes an antinoise barrier comprising a plurality of perforated tubular members arranged side by side, and each having an interior lining of a sound-deadening material.
  • the wall of each tubular member is typically a perforated metal band that is helically coiled to form a tube.
  • tubular members lined with a sound-deadening material as provided by the prior art are, however, of a relatively expensive construction, and, moreover, they are quite cumbersome and take a large space when they are shipped or stored.
  • the main object of the invention is therefore to provide a noise reducer for use on top of sidewalls, barriers, etc., that can be manufactured by simple and cheap procedures, and without a need for dedicated, high-cost equipment.
  • Figs. 1, 2 and 3 show a first embodiment of the invention, as applied to a partly transparent barrier.
  • respective stakes 12 made of metal beams, say H-beams, are supported by means of flanges 11.
  • Prefabricated panels 14 of porous concrete are arranged between the stakes.
  • respective sheets 15 of transparent polymetacrylate are also arranged, and finally girders 16 fastened through flanges 17 extend between the tops of stakes 12.
  • a noise reducer is arranged along the top of the barrier, which noise reducer comprises spiral tubes 18 of perforated aluminum plate which is curved helically and is laterally swaged (as is known to a person skilled in the art), of about 300 mm diameter. Tubes 18 lie longitudinally on the top of the barrier and are fastened to the barrier by means of straps 19 having their opposite ends attached to stakes 12 or to girders 16 with bolts 20. The ends of spiral tubes 18 are joined to one another by means of bolted joints 21, which comprise respective enveloping plates or stubs of spiral tube of slightly larger diameter, not shown.
  • the plate of tubes 18 is riddled with holes of, say, 5 mm diameter, the percentage of riddling being 30 to 35%.
  • fiberglass 25 is placed within the tube as a lining arranged peripherally along its inside wall.
  • the fiberglass has a preferred density of about 80 kg/m 3 .
  • the barrier provides a noise reduction equivalent to a conventional barrier which is 1 to 1.5 m taller.
  • the noise reducer with 300 mm diameter has a effect equivalent to a barrier raising made conventionally with panels of porous concrete, in a degree of 3 to 4 times its diameter.
  • a 2-meter high acoustical barrier was subjected to tests in an anechoic room, with and without the noise reducer of 300-mm diameter as described above.
  • a loudspeaker was used which was encased in a perforated tube lying on the ground at 1.3 meters from the barrier and parallelly to it.
  • a measuring microphone was placed on the other side of the barrier at a height of 4 meters and at several horizontal distances D from the barrier.
  • a white-noise signal in the range 50 to 10,000 Hz was applied to the loudspeaker, at a arbitrary, high volume.
  • the overall sound levels L 50 to 10,000 Hz
  • the following results were obtained: D (meters) 3 4 5 6 L (dBA) conventional barrier 75.7 73.1 71.2 69.7 barrier with spiral noise reducer 71.2 68.8 67.3 66.5
  • the attenuation improvement brought about by the noise reducer of the invention is 3 to 4 dB, which amounts to a halving (or more) of the sound level with respect to the conventional barrier.
  • Fig. 4 shows a second embodiment of noise reducer according to the invention.
  • the reducer is similar to the first embodiment, and is mounted on the barrier in the same way, but it is formed from octagonal tubes of perforated aluminum plate rather than from spiral tubes.
  • each octagonal tubes is fabricated by bending two rectangular plates 22, 24 with four longitudinal bends, to obtain respective half-shells each comprising five pans angled at 45° to one another, so that the two end pans are parallel.
  • the half-shells 22, 24 are then frontally approached and their respective end pans are overlapped and then rivetted together to obtain the completed tube.
  • the tube is then internally lined with a layer of fiberglass 25 similar to the fiberglass of Fig. 3.
  • the plate of half-shells 22, 24 is perforated in its intermediate pans with holes of 3 mm diameter, with a percentage of perforation 25 to 30% of the overall surface.
  • the octagonal tube has the advantage that it can be manufactured with simple bending machines, and does not require the more expensive equipment for the manufacture of spiral tube. Moreover, in the octagonal tube the portion of the plate facing upwards may be left solid (i.e. non-perforated), so that fiberglass is partly protected from rain and snow.
  • Fig. 5 shows a third preferred embodiment of a noise reducer according to the invention.
  • the noise reducer comprises a tube of aluminum plate shaped as an irregular, elongated hexagon, having a narrow base pan, two wide, slightly diverging lateral pans, two narrow, sharply converging pans, and finally a horizontal, closing top pan. Only the lateral diverging pans are perforated, e.g. with 6-mm holes, with a perforation percentage of 30 to 35%.
  • the tube of Fig. 5 is made from two half-shells of metal plate, a lower half-shell 26 and an upper half-shell 28.
  • Upper half-shell 28 has bent edges 30 coupling with the edges of lower half-shell 26 and rivetted to them.
  • the lateral diverging pans are preferably provided with stiffening creases 32, and, moreover, a metal C-section 34 is internally rivetted to the upper half-shell, also for stiffening purposes.
  • the internal surfaces of the diverging pans are lined with respective fiberglass mattresses 36, similarly as described above.
  • the third embodiment of reducer gives similar results with those of the previous embodiments, in fact slightly better.
  • the hexagonal-tube reducer has the advantage of a practically complete protection of the fiberglass from the weather, due to to the upper half-shell extending over the entire width of the reducer.
  • the enhancement of its effectiveness is probably also aided by the reflected power fraction being deviated toward the ground by the inclination of the operative surfaces of the reducer.
  • Fig. 6 shows the fourth embodiment of the invention, which is similar to the second embodiment shown on Fig. 4, inasmuch as it comprises an octagonal tube 40 of perforated plate which is internally lined with fiberglass 42. However, this embodiment also comprises a tube 44 with non-perforated wall, placed floating in the space left empty by the fiberglass lining. Tube 44 may be a spiral tube with a thin wall (e.g. 0.5 mm) of galvanized steel, which is kept in position by the fiberglass mattress.
  • a thin wall e.g. 0.5 mm
  • tube 44 forms, together with outside tube 40, an annular space where the acoustic power is trapped and is damped progressively while it bounces between both tubes.
  • noise reducer according to the invention in its various forms an materials envisaged, can be manufactured without any special, expensive equipment being required, such as moulds and the like, but rather by use of only conventional, well available machines, such as benders, rivetters and the like.
  • the tubular members may be manufactured by other technologies and have other geometries.
  • the plates could curved rather than bent with sharp angles.
  • another sound-absorbing material might be used instead of fiberglass, such as rock wool or other.
  • the fastening means might also be different.
  • it might be advantagaous to attach the noise reducer to the underlying barrier by means of bolts crossing the base pan of the lower half-shell, and to assemble the upper half-shell onto it only after installation on the barrier.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Road Signs Or Road Markings (AREA)
  • Bridges Or Land Bridges (AREA)
  • Noise Elimination (AREA)
EP96201207A 1995-05-22 1996-05-02 Noise reducer for wayside acoustical barriers Expired - Lifetime EP0744496B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO950400 1995-05-22
IT95TO000400A IT1279551B1 (it) 1995-05-22 1995-05-22 Riduttore di rumore per barriere acustiche stradali

Publications (2)

Publication Number Publication Date
EP0744496A1 EP0744496A1 (en) 1996-11-27
EP0744496B1 true EP0744496B1 (en) 2000-01-05

Family

ID=11413568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96201207A Expired - Lifetime EP0744496B1 (en) 1995-05-22 1996-05-02 Noise reducer for wayside acoustical barriers

Country Status (5)

Country Link
EP (1) EP0744496B1 (it)
AT (1) ATE188524T1 (it)
DE (1) DE69605974D1 (it)
ES (1) ES2143712T3 (it)
IT (1) IT1279551B1 (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1005233C2 (nl) * 1997-02-10 1998-08-11 Spiral Ventures B V Inrichting voor het opvangen en behandelen van een zich verplaatsende luchtstroom, alsmede toepassingen daarvan.
NL1013311C2 (nl) * 1999-10-15 2001-04-18 Jansen Kunststoffen B V Geluidabsorberende module, geluidabsorberend scherm of wand en werkwijze voor de vervaardiging van de geluidabsorberende module.
IT201800002437A1 (it) * 2018-02-06 2019-08-06 2 Zeta Srl Elemento di barriera acustica e barriera acustica comprendente tale elemento di barriera

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2226910A5 (en) * 1973-04-20 1974-11-15 Elastomeres Plastiques Motorway sound-insulating panel - several aligned screens adjacent motorway
EP0315710B1 (en) * 1987-11-11 1993-02-10 Nitto Boseki Co., Ltd. Sound absorbing pipe
IT1259060B (it) * 1992-03-10 1996-03-11 Struttura di barriera antirumore

Also Published As

Publication number Publication date
EP0744496A1 (en) 1996-11-27
ES2143712T3 (es) 2000-05-16
DE69605974D1 (de) 2000-02-10
ITTO950400A0 (it) 1995-05-22
ITTO950400A1 (it) 1996-11-22
ATE188524T1 (de) 2000-01-15
IT1279551B1 (it) 1997-12-16

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