PURPOSE: To surely reduce the ground vibration in a wide area inputted via the ground.
CONSTITUTION: An earth retaining wall 2 made of a retaining wall is arranged at the portion of an underground railway tunnel 1 side, and a building 3 is constructed so that its underground wall 4 is faced to the earth retaining wall 2 at a preset interval. A vibration-proof wall 5 is arranged between the earth retaining wall 2 and the underground wall 4, and multiple vibration-proof materials 6 made of vibration-proof rubber are arranged between the vibration- proof wall 5 and the underground wall 4 of the building 3. Multiple dynamic dampers vertically faced with their axes are arranged in the vibration-proof wall 5. Multiple rigid steel balls are vertically connected with springs in the hollow body made of a steel pipe of the dynamic damper, and the steel balls are connected with springs horizontally faced with their axes on the inner periphery of the hollow body.
HASHIZUME HISAYOSHI
KAWAKAMI JUN
HIRAMATSU TOMOTAKA
TAKAGI MASAMI
NAGATAKI YOSHIAKI
