What is Vacuum Excavation?

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Vac-Ex unit

Vac-Ex Process

Vacuum excavation describes the method of safely excavating around buried utilities. The technology has existed for several decades but has been refined to have wider and more efficient applications throughout construction.

Service trenches, perimeter digs, or bespoke access solutions are just some of the possible applications. The vacuum excavation units can excavate up to 30 meter depth, 80 meters horizontally and have worked 50 meters vertically.

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Vac-Ex excavation of soil

How Vac-Ex Works

Breaking the ground – Compressed air is directed through an insulated AIR-EX lance to loosen, agitate, or aerate the ground initially. This loosened debris is then safely removed by the vacuum.

Removing the ground – The Vac-Ex unit generates a large amount of Air Flow & Vacuum through their Vacuum turbines. Air and debris travel through the Vacuum pipe into the Debris Chamber / Container. The Pressure drop inside the Container allows any air-borne particles to fall from the air stream. This partially clean air travels through a series of filters which further separate debris and dust. The ‘clean’ air is then finely filtered to 5 microns before being expelled through the baffles to the atmosphere.

Difficult ground – If the ground is more stubborn, high-pressure water is an excellent alternative. The resultant materials can then be removed using the same process above.

Transportation & Disposal – The Vac-Ex machines are sealed units, enabling the material to be transported without the risk of spillages or cross-contamination. Depending on the unit of choice, the resultant material can then be tipped to ground, bulk bag, wheelbarrow, skip and stockpile or into a controlled environment.

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