| 摘要 |
PROBLEM TO BE SOLVED: To prevent piles or a foundation slab from being destroyed or sunk unequally by constructing improvers reaching the bottom surface of the foundation slab by its end from the outer circumference of a foundation slab through the stirring and mixing operation of original ground soil and a solidifying agent. SOLUTION: Improvers 4 are constructed to be inclined with respect to perpendicularity in a manner not giving rise to collision with piles 2 so that its end comes to a foundation slab 1 or the bottom surface of the ground therearound through the stirring and mixing of ground soil and a solidifying agent from the ground at the outer periphery of the foundation slab 1. In this instance, an outer peripheral slab 5 being connected with each apex of the improvers 4 is constructed in contiguity with the foundation slab, and the improvers 4 are indirectly connected to the foundation slab. As such, inasmuch as the improvers 4 are caused to bear a part of the vertical load of an upper part structure and horizontal force exerting the foundation slab during earthquake, vertical upward reaction exerting the piles with the horizontal force, compression force and horizontal force being borne by the piles can be reduced. Therefore, this prevents the destruction and sinking of piles caused along with an effect of horizontal force can be prevented.
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