NOISE-REDUCING SCREEN Russian patent published in 2012 - IPC E01F8/00 

FIELD: construction.

SUBSTANCE: noise-reducing screen comprises bearing elements such as cross stands and longitudinal profiles, a noise-absorbing element arranged with the specified air gap in the cavity between a rear sound-reflecting panel and a face sound-transparent panel perforated with through holes. The noise-absorbing comprises a bearing base of sheet perforated or mesh type fixed to horizontal profiles and/or a base of the noise-reducing screen by mechanical fastening elements, lined at least at one of its sides with separated sound-absorbing panels representing a combination of ground fragments of porous fibrous or foamed open-cell materials, which are distributed in a certain manner and fixed fast on the surface of the bearing base, to produce air gaps between them. The value of the produced equivalent air gap between near end surfaces of separated sound-absorbing panels does not exceed where S_el - area of projection at the face surface of the bearing base that is least in area among near separated sound-absorbing panels fixed on it. Width of the air gap formed between face surfaces of separated sound-absorbing elements and the surface of the face perforated panel, face surfaces of separated sound-absorbing elements and the surface of the rear sound-reflecting panel is in the range Z=2…20h_sa, where h_sa - thickness of separated sound-absorbing panels determined by size of section perpendicular to the face surface of the bearing base, at least at the side of location of separated sound-absorbing panels, the surface of the noise-reducing element is lined with a layer of sound-transparent gas and moisture impermeable film or tissue. Individual design versions of a noise-absorbing screen are proposed.

EFFECT: invention will make it possible to increase degree of sound energy absorption due to fuller usage of multiple perimeter zones of sound-absorbing elements, inclusion of mechanisms for implementation of end face diffraction effects of sound energy absorption, due to minimisation of sound waves reflection effects from bearing bases of a noise-reducing screen with the specified extent of sound transparency.

14 cl, 15 dwg