BASE ISOLATION STRUCTURE OF GROUND AND ITS FORMING METHOD

PURPOSE: To provide a base isolation structure applicable to both existing and new construction structures by forming a cone-shaped or truncated cone-shaped wall, charged with a filler having damping performance, in the periphery of the structure of its construction planned area. CONSTITUTION: In the periphery of a structure 10 in the ground 12 or along the periphery of a construction planned area of the structure 10, one or a plurality of holes 32..., 36, 36 are formed from on the ground 12 toward one point in the ground 12. Next, these holes 32, 36 are charged with a filler 34 having damping performance. By repeating this operation, a wall 14 of regulating a conical surface 18 or truncated conical surface is formed in the ground. Then, when generated an earthquake, its force, transmitted from the peripheral ground 22 to the internal ground 20, is damped to reduce dynamic stress in the internal ground 20. Accordingly, liquid-shaping the internal ground 20 and destructing the structure 10 can be prevented.