Hybrid foundation structure, and method for building same

Abstract

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.

1 . A hybrid foundation structure comprising:
 an upper support layer  10  formed on the ground in the vertical direction;   a lower support layer  20  extended downward from the upper support layer  10  in order to have the narrower width compared to the width of the upper support layer  10 , and   the upper support layer  10  and the lower support layer  20  are formed by the injection of solidified soil which is the mixture of earth, sand, and a soil-solidifying agent.   
     
     
         2 . The hybrid foundation structure according to  claim 1 , wherein
 the lower support layer  20  is formed with deeper depth compared to the depth of the upper support layer  10 .   
     
     
         3 . The hybrid foundation structure according to  claim 1 , wherein
 the upper support layer  10  is formed with narrower width of the lower part compared to the width of the upper part.   
     
     
         4 . The hybrid foundation structure according to  claim 3 , wherein
 the upper support layer  10  is formed into a conical structure, and the upper support layer  20  is extended from the lower part of the upper support layer  10 .   
     
     
         5 . The hybrid foundation structure according to  claim 3 , wherein
 the upper support layer  10  and the lower support layer  20  are formed into a cylindrical structure, and a variable cross-section support layer  11  with a tapering variable cross-sectional structure is formed in the lower part of the upper support layer  10 .   
     
     
         6 . The hybrid foundation structure according to  claim 1 , wherein,
 when the ground is formed downward in the order of a weak stratum a and a support layer b,   the boundary part of the upper support layer  10  and the lower support layer  20  is formed to place in either the lower part of the weak stratum a or the upper part of the support layer b;   the lower support layer  20  is formed to place in the support layer b.   
     
     
         7 . The hybrid foundation structure according to  claim 1 , wherein,
 when the ground is formed downward in the order of a first weak stratum a 1 , a first support layer b 1 , a second weak stratum a 2 , and a second support layer b 2 ,   the boundary part of the upper support layer  10  and the lower support layer  20  is formed to place in either the lower part of the first weak stratum a 1  or the upper part of the first support layer b 1 ;   the lower part of the lower support layer  20  is formed to place in either the lower part of the second weak stratum a 2  or the upper part of the second support layer b 2 .   
     
     
         8 . The hybrid foundation structure according to  claim 1 , wherein
 a steel or concrete material core  21  is inserted into the lower support layer  20 .   
     
     
         9 . The hybrid foundation structure according to  claim 8 , wherein
 the core  21  is laid under the ground with its upper part penetrating through the center of the upper support layer  10 .