What are Micro Piles?
Micro piles are small diameter piles that have the ability to be installed in any type of ground. They can be installed quickly and in practically any type of environment, particularly in restricted or hard to reach areas with low headroom, because of the adaptive drilling equipment. Micro piles do not rely on end-bearing capacity, with design loads as small as three tons and as high as 500 tons.
The micro pile integrates completely with the soil. It forms a foundation system of reinforced soil mass, in particular if placed in groups. The piles are drilled-grout-injected in one step, using the hollow bars as drill rods and grouting ducts with disposable special drill bits and rotary drilling methods.
The drill bits have jet openings allowing for pressure grout penetration while drilling into the soil. During drill advancement and grout injection through the hollow bars, with the aid of a flushing head, the drill cuttings are continuously flushed by the cement grout.
This method has a clear advantage because while the drill hole is stabilized, the ground cannot relax or cave around the drill location the soil around the area is being penetrated by the grout causing it to densify.