TUNNEL BLASTING SOUND REDUCTION DEVICE

• Main Authors: TSUTSUI TAKANORI, UCHIDA SUENOBU, IWANE YASUYUKI, KOBAYASHI MASATO
• Format: Patent
• Language: English; Japanese
• Published: 01.09.2016
• Subjects: ACOUSTICS; ACOUSTICS NOT OTHERWISE PROVIDED FOR; EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; MINING; MUSICAL INSTRUMENTS; PHYSICS; SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS; SHAFTS; SOUND-PRODUCING DEVICES; TUNNELS

PROBLEM TO BE SOLVED: To provide a tunnel blasting sound reduction device capable of providing a sufficient reduction effect against ultra-low frequency sound of 10 Hz or less.SOLUTION: The tunnel blasting sound reduction device according to the present invention can be moved in a longitudinal direction in a tunnel. The device has a plurality of sound tubes for reducing a sound emitted from a sound source. Each of the sound tube is a hollow tube which has a closed one end to form a closed portion and opened the other end to form an opened portion. The respective sound tubes have length corresponding to 1/4 wavelength of sounds with a plurality of different frequencies emitted from the sound source. The sound tubes are installed along the longitudinal direction of the tunnel and arranged so that the opened portion is provided at a position where a sound pressure level of a sound with a frequency resonating with the sound tube reaches a peak in the tunnel.SELECTED DRAWING: Figure 1 【課題】１０Ｈｚ以下の超低周波音に対し十分な低減効果を得られるトンネル発破音低減装置を提供する。【解決手段】本発明によるトンネル発破音低減装置は、トンネル内の縦断方向に移動可能であり、音源から発せられる音を低減させる音響管を有し、前記音響管は一端が閉塞された閉鎖部と、他端が開口した開口部となっている中空の管からなり、前記音源から発せられる複数の異なる周波数の音の１／４波長に対応した管長を有した複数が設けられ、それぞれの前記音響管が前記トンネルの縦断方向に沿って設置され、前記音響管が共鳴する周波数の音の前記トンネル内での音圧レベルがピークとなる位置に前記開口部を設けるように配置される【選択図】図１