Abstract: An improved vibrodriver for sinking a vertically elongated element of substantially uniform horizontal cross-section into or extracting such an element from the ground. The element is one of a plurality of like elements arranged side-by-side along a straight or curved line. The vibrodriver includes at least one pair of eccentrics with each eccentric or a portion thereof situated on a different side of the element. The vibrodriver has a waist which is narrower than the width of an element along the line; beyond the waist and toward its lateral ends the vibrodriver has at least one portion of each side thereof which is wider than the width of an element, thereby enabling the vibrodriver to be of relatively short horizontal length perpendicular to said line and yet to exert a substantial vertical vibratory force during the sinking or extraction of an element juxtaposed to at least one other element.