| 简介 |
PROBLEM TO BE SOLVED : To provide a noise control structure capable of controlling noise efficiently in a building that has foundations with insulating means, floors without insulating means and concrete-on-earth under the floors. SOLUTION : Mat-type acoustic materials 7 are placed on concrete-on-earth 3 under the floors, that have the functions of humidity conditioning and de- smelling. Materials like cellulose fiber, etc., that are put in sacks for foundations made of cloth woven with charcoal together are preferably used, as the materials 7. |
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