Noise barrier structure with sound-absorbing and sound-redirecting properties, and high performance sound absorber for use in such structure
AssigneeUrbantech S.R.L.
InventorGiampaolo Tizzoni
Life of this patent
Estimating the term…
Abstract
A noise structure having a barrier made of a generally sound redirecting material defining a surface of the barrier, and a plurality of sound absorbing boxes connected to this surface, each box comprising a rear wall and an extensively perforated front wall, the walls defining a longitudinal channel at least partially occupied by a filling made of a sound absorbing material, in which the rear wall is a substantially flat plane wall assembled parallel to and spaced apart from the surface of the barrier and is in its turn extensively perforated.
Claims25
A noise structure comprising a barrier made of a generally sound redirecting material defining a barrier surface, and a plurality of sound absorbing boxes connected to said surface, each box having an elongated configuration according to a longitudinal axis and comprising a substantially flat rear wall and a front wall with an extensive distribution of holes, said walls defining a longitudinal channel which develops along said axis and is at least partially occupied by a filling made of a sound absorbing material, wherein said front and rear walls are both on a same side of the barrier as defined by said barrier surface, and that said rear wall is a generally flat wall mounted parallel to and spaced apart from said surface of the barrier and has in its turn an extensive distribution of holes, wherein at least a group of said sound absorbing boxes provides for at least two rows of boxes, each row comprising at least one box, the rows extending along respective parallel axis and being spaced apart on a plane parallel to said surface of the barrier orthogonally with respect to said axis, thus forming respective gaps, thereby a first region is delimited between the boxes of different rows, the surface of the barrier and the rear walls of the boxes, said first region defining a first Helmholtz resonator in a direction orthogonal to the surface of the barrier, the neck of the first resonator corresponding to a gap between two boxes of different rows.
A sound absorbing box comprising connection means for the connection to a surface of a noise barrier, the box having an elongated configuration according to a longitudinal axis and comprising a generally flat rear wall and a front wall with an extensive distribution of holes, said walls delimiting a longitudinal channel which develops along said axis and is at least partially occupied by a filling made of a sound absorbing material, wherein the rear wall is a generally flat wall having in its turn an extensive distribution of holes, said connection means being adapted to keep both said rear wall and said front wall on a same side of the barrier as defined by said barrier surface, with said rear wall parallel to and spaced apart from the surface of the barrier, said connection means comprising one or more studs projecting orthogonally from said rear wall and provided at the free end with an enlarged head adapted to be slidingly engaged in a linear track integral with said surface of the barrier or fastening wings that integrally develop from said front wall beyond said rear wall of said box, wherein said filling made of sound absorbing material comprises a base layer placed parallel and adjacent to said flat rear wall and a plurality of front layers superimposed one upon the other on respective planes orthogonal to said rear wall and parallel to said axis, such front layers having a rear end close to said base layer and a front end distanced from said front wall, the front ends being mutually staggered between two or more adjacent layers so as to determine a stepped front of said filling.
Dependencies are inferred from the claim text.