Acoustic shielding device for damping of disturbing traffic noise

Abstract

The invention relates to an acoustic screening device ( 1 ) for damping disturbing noise, especially such noise which arises from road traffic, rail traffic and the like, comprising a framework ( 2 ), preferably of concrete, and a noise absorber ( 3 ) arranged thereon, preferably fitted flat against the framework ( 2 ), and in which the noise absorber is configured as an exchangeable cassette ( 3 ) comprising a noise-absorbing mat ( 13 ). The invention is achieved by virtue of the fact that an air gap former ( 14 ) is arranged integrated in the cassette ( 3 ) behind the noise-absorbing mat ( 13 ) in such a way that an air gap ( 15 ) is formed between the noise-absorbing mat ( 13 ) and the framework ( 2 ), that the air gap former ( 14 ) is arranged to form a number of cells ( 16 ) or compartments between the noise-absorbing mat ( 13 ) and the framework ( 2 ), the cells ( 16 ) or the compartments being arranged to form substantially closed air volumes, and that the noise-absorbing mat ( 13 ) is arranged to be, at least to some degree, noise and air permeable.

1 . Acoustic screening device for damping disturbing noise, especially such noise which arises from road traffic, rail traffic and the like, comprising a framework, and a noise absorber arranged thereon, and in which the noise absorber is configured as an exchangeable cassette comprising a noise-absorbing mat, 
       characterized
 in that an air gap former is arranged integrated in the cassette behind the noise-absorbing mat in such a way that an air gap is formed between the noise-absorbing mat and the framework, 
 in that the air gap former is arranged to form a number of cells or compartments between the noise-absorbing mat and the framework, the cells or the compartments being arranged to form substantially closed air volumes, and 
 in that the noise-absorbing mat is arranged to be, at least to some degree, noise and air permeable. 
 
     
     
         2 . Acoustic screening device according to  claim 1 , characterized in that the noise absorber consists of a mat of rubber granulate. 
     
     
         3 . Acoustic screening device according to  claim 1 , characterized in that the rubber granulate is bound in the mat in such a way that air-permeable pores or channels are formed in the mat. 
     
     
         4 . Acoustic screening device according to  claim 1 , characterized in that the noise absorber is fitted against a substantially plane concrete surface. 
     
     
         5 . Acoustic screening device according to  claim 1 , characterized in that the air gap is 10-60 mm wide. 
     
     
         6 . Acoustic screening device according to  claim 1 , characterized in that the air gap is 30 mm wide. 
     
     
         7 . Acoustic screening device according to  claim 1 , characterized in that the front surface of the noise absorber is arranged substantially level with the front limit surface of the framework. 
     
     
         8 . Acoustic screening device according to  claim 1 , characterized in that the upper surface of the concrete framework is placed at a level which enables passengers to be quickly and easily evacuated from a train which has come to an unscheduled halt on the track. 
     
     
         9 . Acoustic screening device according to  claim 1 , characterized in that evacuation doors are arranged in the concrete framework so that staff present in the track region can be quickly and easily evacuated. 
     
     
         10 . Acoustic screening device of  claim 1  wherein the framework is a concrete framework. 
     
     
         11 . Acoustic screening device of  claim 1  wherein the noise absorber is fitted flat against the framework.