集合住宅における生活騒音の実態と TNEL による評価

Abstract

In designing multifamily dwellings which are adjacent each other through a party wall or floor, it is natural that the greatest importance should be attached to the prevention of internal noises. According to the answers to the questionaire put to people living in multifamily dwellings, most of the complaints centered around the sound coming from the above flat. As shown in Table 2, 3, 4, the majority of sound sources are impacts transmitted through the floor, e. g. jumping or running of children as well as plumbing noise in the lavatory and bath room above. On the other hand, A-weighted sound level which are commonly caused in the apartment house by the daily life of the neighbouring families having children were measured for 24-h period in the 13 vacant dwelling units shown in Table 8. On the basis of the measurement, the basic data on inhabitant noise were arranged, and as shown in Table 9, averaged peak sound levels, durations and numbers of impacts each 30 minutes were obtained for respective noise sources. In order to evaluate the inhabitant noise, Total Noise Exposure Level (TNEL) for indivisual noise sources were calculated (Table 10). According to the sound insulation grades of building, obtained TNEL data were classified into 3 groups and compared with the frequency of noise complaints in Table 11. As the result, TNEL_<30>' calculated by formula (2) showed a quite well agreement with the frequency of internal noise complaints pointed out by residents. From this view point, it is considered the evaluation of inhabitant noise using TNEL should have been one of the useful index in designing multifamily dwellings, and the 24-h average TNEL would have been reduced to 55 or so.