WOODEN SOUND INSULATION FLOOR

• Main Authors: HAYASHI TORU, TOMINAGA DAISUKE, YOSHIDA KOZO, KATSUYAMA YASUNOBU, MURO HIROKI, SAITO TOSHIO, MORI KIYOTERU, OKAZAKI MITSUTAKA, OKUMOTO TAKUYA, KOBAYASHI YUSUKE, AIDA YU, TAKASE YUJI
• Format: Patent
• Language: English; Japanese
• Published: 10.11.2022
• Subjects: BUILDING; CEILINGS; FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS; FIXED CONSTRUCTIONS; FLOORS; GENERAL BUILDING CONSTRUCTIONS; INSULATION OR OTHER PROTECTION OF BUILDINGS; ROOFS; WALLS, e.g. PARTITIONS

To provide a wooden sound insulation floor that can further minimize whole structural floor unit area mass than a case in which a material with greater specific gravity than cross laminated timber is used and that can reduce a heavy floor impact sound without using a material with poor workability compared to lumber.SOLUTION: A wooden sound insulation floor 100 comprises a sound insulation structural floor 10 that is fixed to a building skeleton 1 and extends horizontally, a weight double floor 20 that is supported on a top surface of the sound insulation structural floor and extends horizontally, and a suspended ceiling 30 that is independently suspended from the skeleton. The sound insulation structural floor 10 is composed of timber or a wooden material. In addition, a secondary natural frequency of a two mass point system consisting of the weight double floor 20 and the sound insulation structural floor 10 is set lower than an evaluating frequency of heavy floor impact sound cutoff performance. The sound insulation structural floor 10 has multiple small beams 12 where both ends are fixed to the building skeleton and that extend horizontally, and multiple small beam reinforcements 14 that are orthogonal to the small beams and extend horizontally and where both ends are fixed to the small beams. Unit area mass of the sound insulation structural floor 10 is set to be larger than or equal to twice and be smaller than or equal to two and a half times of the weight double floor 20.SELECTED DRAWING: Figure 1 【課題】直交集成板より比重が大きい材料を用いる場合より構造床全体の単位面積質量を小さくでき、かつ木材と比較して加工性の悪い材料を用いずに重量床衝撃音を低減することができる木造遮音床を提供する。【解決手段】木造遮音床１００が、建築物の躯体１に固定され水平に延びる遮音構造床１０と、遮音構造床の上面に支持され水平に延びる重量二重床２０と、躯体から単独に吊下げられた吊天井３０とを備える。遮音構造床１０は、木材又は木質材料からなる。また、重量二重床２０と遮音構造床１０からなる２質点系の２次固有振動数が、重量床衝撃音遮断性能の評価周波数より低く設定されている。遮音構造床１０は、建築物の躯体に両端が固定され水平に延びる複数の小梁１２と、小梁に直交して水平に延び両端が小梁に固定された複数の小梁補強材１４とを有する。遮音構造床１０の単位面積質量は、重量二重床２０の２倍以上、２．５倍以下に設定されている。【選択図】図１