GROUND VIBRATION REDUCER

PURPOSE:To lower the propagation of ground vibrations without damaging stability at the time of an earthquake and stability to earth pressure by installing a cushioning material having excellent vibration reducing properties and high compression load bearing capacity onto the vertical surface of the buried footing section of a structure. CONSTITUTION:A ground vibration reducer 2 is mounted into space formed between the underground external wall 1A of a structure 1 and the ground G. The ground vibration reducer 2 is composed of cushioning materials 3 brought into contact properly with a plurality of surfaces in the underground external wall 1A and a shell-shaped plate member 4 supporting an external surface on the ground side so as to be connected and receiving the earth pressure of the ground. The cushioning material 3 is formed of an anisotropic elastic body, and a shear spring constant in the vertical direction is brought to one third of a compression spring constant in the horizontal direction. The cushioning material 3 is given the compression spring constant in the horizontal direction and compression load bearing capacity so as to resist earth pressure in the horizontal direction working at all times and reaction, etc., and a free design is enabled. Accordingly, the vertical component of ground vibrations transmitted over the structure 1 can be reduced largely.