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DTH drills are becoming increasingly used in foundation construction. The existing concerns for this are environmental impact of compressed air among existing structures, risking air leakage and over drilling.
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With high risk and sensitivity of DTH drilling in foundation works, the art of controlling the removal of debris from cutting is a challenge. 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.
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Concerns varies based on the sensitivity of ground conditions. 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 settlements. In sand, excessive flushing can unconsolidated the ground, decreasing the capacity of existing friction piles, which in turn might cause pile buckling and result in settlements of buildings.
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Ming presents the new generation of ECCS-MC system for drilling in Sensitive Ground Conditions.
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ECCS-MC system minimizes the air escaping to the surrounding ground as the high-pressure air never directly faces to the ground. The system is built on redirection of the air flow. The side air lift holes keep just enough for efficient flushing.
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How ECCS-MC system works:
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High-pressure air travels down from the DTH hammer to the center of main air holes of the ECCS-MC system.
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Most of the compressed air travels to the side air lift holes, and goes to the casing shoe and end of the casing. That prevents air and cuttings from going outside of the casing.
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Only a minimal amount of air goes to the holes between the wings and the bit to clear the cuttings back to the ground.
