Patent ID: 8925678
Filing Date: 2015-01-06
Classification: E01F,E04B

Abstract:
1. 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.