STUDY ON ESTIMATION METHOD OF HEAVY FLOOR IMPACT SOUND INSULATION RANK WITH DRIVING-POINT IMPEDANCE IN MIDDLE OF CONSTRUCTION

Floor impact sound insulation performance is evaluated by sound pressure level of receiving room when the floor of the upper surface was impacted by the standard impact source. Therefore, it is necessary to make the sound receiving room for a closed space. We propose an estimation method of heavy floor impact sound insulation rank of concrete floor slab using measurable driving-point impedance only at the slab upper surface. First, we compared driving-point impedance in impact time or driving-point impedance in response time with heavy floor impact sound level. As a result, driving-point impedance in response time was better corresponded to heavy floor impact sound level. Next, in order to improve the correspondence, multiple regression analysis was performed to estimate factors affecting the floor impact sound level. We investigated a method of correcting by using parameters using this factor in predictive calculation by impedance method 2009. As a result, it was confirmed that by correcting driving-point impedance in response time with sound receiving room area and number of edge fixing, it is possible to grasp heavy floor impact sound insulation of concrete floor slab. By using this result, it becomes possible to satisfy the required performance at completion more reliably.