Sound absorbing wall structure

Abstract

To provide a sound absorption wall structure for a railroad incorporating a sound absorption material having a sound absorption coefficient that does not easily decrease even in a high moisture environment.SOLUTION: A sound absorption wall structure has a sound absorption panel 11 containing a sound absorption material in a frame fixed to a wall 20 erected along a railroad track or a support having a pair of flanges facing each other. The sound absorption material is composed of a filling containing at least fibers made of polyester resin and a skin material enclosing the filling. The skin is made of a nonwoven fabric containing fibers made of polypropylene resin. The sound absorption panel 11 is fixed to the wall 20 or the support via an L-shaped joint plate 21 or an S-shaped joint plate as an interposition member interposed between the wall 20 or the flange and a side wall 13 of the frame.SELECTED DRAWING: Figure 4

Claims

1. A sound-absorbing wall structure in which a sound-absorbing panel having a sound-absorbing material housed in a frame is fixed to a wall surface erected along a railway track or to a support having a pair of flanges facing each other, The sound absorbing material is The present invention comprises a filling material containing fibers made of at least a polyester resin, and a skin material containing the filling material, the filling material being contained in the skin material by an end of the skin material fused by an ultrasonic sealing method, and the skin material being made of a nonwoven fabric containing fibers made of a polypropylene resin, A first spunbond nonwoven fabric, a meltblown nonwoven fabric located on the first spunbond nonwoven fabric, a second spunbond nonwoven fabric located on the meltblown nonwoven fabric, and a third spunbond nonwoven fabric located on the second spunbond nonwoven fabric, the third spunbond nonwoven fabric having an average fiber diameter in the range of 30 to 50 μm and a basis weight in the range of 70 to 150 g / m2, A sound-absorbing wall structure, characterized in that the sound-absorbing panel is fixed to the wall surface or the support via an interposition member interposed between the wall surface or the flange and the frame.

2. The sound absorbing wall structure according to claim 1, 13. A sound-absorbing wall structure, wherein the intermediate member is a joint plate extending from the frame toward the wall surface or the flange.

3. The sound absorbing wall structure according to claim 1, 13. A sound-absorbing wall structure, wherein the intermediate member interposed between the flange and the frame is a leaf spring formed by bending a steel plate.

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