HYBRID FOUNDATION STRUCTURE, AND METHOD FOR BUILDING SAME

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The present invention relates to a foundation structure vertically installed on the ground, and comprising : an upper support layer (10) formed on the ground in the vertical direction; and a lower support layer (20) formed so as to extend downward from the upper support layer (10) and such that the width thereof is less than that of the upper support layer (10). The disclosed upper support layer (10) and the lower support layer (20) are structures formed from soil solidified by means of feeding and mixing an earth- and soil-solidifying agent therein, and therefore are efficient and prevent overload due to boring equipment.