<p><p><figure id='attachment_3615' style='max-width:475px' class='caption aligncenter'><img class="wp-image-3615 size-full" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Schematic diagram of vibro-concrete column construction." width="475" height="630" /><figcaption class='caption-text'> Diagram of vibro-concrete column installation.