There are four types: "surface layer improvement method" for hardening the ground with cement, "pipe pipe pile method" for driving metal pipe piles, "pillar improvement method" for embedding cement piles, and "high-speed method" for forming columnar crushed stone piles on the way. It is recommended to adopt the method suitable for the ground from the survey results of the parcel number.
When an earthquake occurs, conventional cement and other methods cause
damage, but crushed stone piles in the High Speed method do not cause damage.In
addition, the ground itself can be reinforced, so it has the effect of
mitigating resonance.In earthquakes, ground improvement using crushed stones
is optimized for earthquakes as it does not cause any major damage.
Drilling is performed by a drill, natural crushed stones are thrown in,
and crushed stones are pushed in by a drill tip, so that a number of crushed
stone piles are formed and the pile periphery is strengthened. Crushed
stone columns with high friction resistance in the horizontal direction
are constructed, and the whole ground is hardened by reinforcing them.It
also uses natural crushed stones, so it can be reused without the need
for removal.Crushed stone piles do not decay or rust, so the ground remains
liquefaction in soft ground is inevitable.Because the crushed stone columns
themselves pass water, they release water pressure in the ground, and the
effect of the piles driven in many places is enormous, so that liquefaction
caused by earthquakes can be prevented in advance.
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