| abstract |
An object of the present invention is to absorb ambient noise of an apartment house, an office, a theater, a moving body, and the like. A sound absorbing structure according to the present invention includes a sheet-like low frequency sound absorbing material 2a placed on a floor surface 1 of an apartment house made of reinforced concrete, and a low frequency sound absorbing material 2a on an upper surface of the low frequency sound absorbing material 2a. A plate-shaped reinforcing layer 3 arranged in parallel and a sheet 4 placed on the upper surface of the reinforcing layer 3 and having a property of transmitting sound are provided. The low-frequency sound-absorbing material 2a is laminated on the lower surface side of the film 21 made of a material that exhibits excellent sound-absorbing characteristics in the low-frequency region, for example, a film 21 made of silicone rubber containing an inorganic compound disposed on the reinforcing layer side. And a porous body layer 22. The reinforcing layer 3 is made of stainless punching metal having an aperture ratio of about 40 to 70% and a thickness of about 4 mm, and the sheet 4 is made of, for example, a fabric carpet. [Selection] Figure 1 |