Vibro Piers is a ground improvement technique that constructs short, stiff aggregate piers to reinforce fine grained soils. The pier location is initially predrilled for soils in which the hole will remain open. In soils that cave or collapse, a bottom feed vibrator can be employed. The downhole vibrator is lowered vertically to the designed tip of the pier typically with a standard crane. Aggregate (new crushed stone or recycled concrete) is then introduced into the hole and is compacted in lifts by repeated penetrations with the vibrator. The vibratory energy from the vibrator densifies the aggregate and any surrounding granular soil. The high modulus pier reinforces the treatment zone. The technique has been used to increase bearing capacity and decrease settlement for planned structures, embankments, tanks and towers.
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