Elemex SystemThe Elemex System
- Foundation drilling and underpinning work are frequently carried out where existing foundations are sensitive to any kind of disturbance in their immediate surroundings. In those areas, DTH drilling gives one great challenge - controlling the removal of cuttings from the hole with compressed air. The flow of compressed air needs to be strong enough to transport the cuttings up to the surface, but must not escape into the surrounding ground or remove excessive soil. In clay, air from the DTH drilling can escape to surrounding working foundations and weaken the adhesion between soil and load-bearing elements. This brings a risk for sudden settlement. In sand, excessive flushing can unconsolidate the ground, decreasing the capacity of existing friction piles, which in turn might cause pile buckling and result in the settlement of buildings.
The new and reliable Elemex system for controlled flushing was invented by combining comprehensive field experience and testing with airflow simulation and analysis. Together with some of our most dedicated customers, Atlas Copco has designed this product to take on the most sensitive projects, and Elemex is already proving itself in the field.
Conventional DTH drilling systems push air straight into the ground, which is a feature derived from rock drilling applications where the rock face needs as much air as possible to be cleaned efficiently.
The unique concept behind the Elemex design is built on redirecting the airflow. Once the air reaches the bit face, it is blown against the extended ring bit walls, which redirect the flow across the face. This way the air pressure is decreased just enough to allow an efficient flushing of the bit face without escaping to the surrounding ground.