<p><p><figure id='attachment_1579' style='max-width:640px' class='caption alignnone'><img class="wp-image-1579 size-full" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Photograph of a Vibro-Concrete Column vibratory rig." width="640" height="480" /><figcaption class='caption-text'> VCC vibratory rig. Photograph courtesy of James Collin.</figcaption></figure></p><p>VCCs use a vibrator to penetrate soft soils and to densify the bearing stratum to a limited degree. The column is constructed in a manner similar to aggregate columns but instead of feeding stone to the tip of the vibrator, concrete is pumped through an auxiliary tube to the bottom of the vibrator. Advantages include quick construction, environmentally friendly (no spoils), and greater column stiffness compared to aggregate columns. This technique is applicable to new embankments on unstable soils and roadway construction and widening.</p><p>