VIBRATION ISOLATION AND SOUNDPROOF UNDERGROUND WALL AND EXECUTION THEREOF

PROBLEM TO BE SOLVED: To set a vibration isolation and soundproof underground wall by pilled-up weight of foaming plastic blocks down to a deep part in soil by reducing buoyancy of the foaming plastic blocks in combination with weight of concrete and the like, and performing settling without influence of muddy water in the ditch wall. SOLUTION: A foaming styrene unit block 3 is constituted of U-shaped foaming styrene 31 of required length in combination with weight material of concrete 32 and the like of its inside, and buoyancy thereof is reduced. An underground wall 1 is positioned in soil, the surface is made one wall body formed by foaming styrene, and sound and vibration in soil are isolated by the foaming styrene 31 of the wall body surface and the weight material of the inside.