도심공동주택 철도소음의 방음벽 차단성능에 관한 연구

Abstract

Abstract In this study, the noise of railway of Donghae Nambu line was examined as it is expected that the residential environment of apartment house, located at the field of railway side of B-si, H-gu, will be affected. To investigate the sound-insulation performance of the existing 5 m high-coloured soundproof wall, models of different height in soundproof wall were chosen and computer simulation with Cadna-A program was used to predict sound level for each floor of the selected apartment house. Through the comparison of expected noise of models before its installation and by height, the performance of each model for soundproofing was investigated and sound level of each floor after the installation of the 5 m-high soundproof wall was measured. Expected noise and measured one were compared. The results are as follows. 1. Under the simulation of existing soundproof wall being installed on the site and considering insertion loss of the wall, the setting of 5 m high wall turned out appropriate for soundproofing for lower floors(3~8F) having short distance length of the apartment house, while the higher floors of the apartment house were barely influenced by the noise of railway for both day and night, because they have distance length enough to block the noise.

2. When an 8m~12m high soundproofing wall was set up, the noise reduction of floors below 8th floor of the house was higher than the installation of the existing 5m high soundproof wall, but the performance of soundproof wall was limited to the lower floors, therefore, it could be concluded that the existing 5m high soundproofing wall would be efficiently used for the lower floors, when considering noise reduction efficiency. If soundproofing wall is installed at the higher ones than 8th floor, it will inevitably increase construction costs. 3. The comparison of sound level predicted by computer simulation and sound level actually measured shows the difference of 4.5~6.9 dB in the higher floors means that they might get more influenced from background noise than in lower floors, and which was in part due to the completion of the building and development of its surroundings. 4. The evaluation of noise from this research proved to satisfy the noise standard of railway, but it is also judged that maximum noise felt by residents of the apartment house and a boundary by PEAK value cannot be ignored. In addition to such experiment, based on existing standard, reasonable evaluation of noise requires continuously abundant simulation documents, traffic investigation in depth, noise environment investigation linked to railway-induced vibration, noise map and survey on dissatisfaction from residents.