| 摘要 |
PROBLEM TO BE SOLVED: To suppress the generation of surplus soil containing a solidification material by a simple operation, in a ground improvement method in which a soil improvement body is constructed underground by making a drilling rod rotate to agitate and mix drilled soil and the solidification material together while discharging the solidification material liquid from the drilling rod including drilling blades and agitation blades.SOLUTION: A hollow frame body 9 is installed on a ground surface where drilling is started, and the inside of the frame body 9 is filled with banking 10. The ground is improved from a depth where non-improved soil exists thereabove at any point deeper than the ground surface downwards to form a deep part improvement body 6. Non-improved soil above the deep part improvement body 6 is improved from a non-improved section close to the deep part improvement body 6 upwards in a state that the banking 10 exists thereabove, thus forming a shallow part improvement body 7. |
