To prevent an adverse effect upon structures in the neighboring area by arranging a cement slurry to maintain an uncured state in the N-1th improved body line constructed directly before constructing the Nth improved body line by mixing a curing delay agent with a cement slurry.
When constructing a large number of pile-shaped improved bodies by curing a cement slurry, a curing delay agent which forces to degrade the speed of curing, is mixed with the cement slurry to be injected into the ground. When constructing the N-1th improved body line L4, the curing speed is set so that the cement slurry may maintain an uncured state as for the N-1th improved body line L3 constructed directly before the execution of the work, thereby absorbing the ground expansion produced during the construction of the improved body lines by means of uncured cement slurry in the improved body line L3. It is, therefore, possible to prevent an adverse effect upon the surrounding ground or structures in the vicinity.
HONDA NOBUHIRO
KANEKI YOSHIZO
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