Patent ID: 8632275

Claim:
An excavation machine comprising: a mast having a longitudinal direction; a kelly bar presenting a first end provided with an excavation tool, the excavation tool comprising two rotary tools designed to turn about parallel horizontal axes during excavation operations; and a carriage movable along the longitudinal direction of the mast and including a first holder member for holding the bar relative to the carriage, said carriage being suitable for moving the bar along the longitudinal direction of the mast, wherein the first holder member is pivotable relative to the carriage, and wherein the first holder member presents a locked state in which the bar is prevented from moving in translation relative to the carriage, and an unlocked state in which the bar is free to move in translation relative to the carriage, wherein the mast presents a first end that carries a second holder member suitable for receiving and holding the bar relative to the mast, said second holder member presenting a locked state in translation in which the bar is prevented from moving relative to the mast, and an unlocked state in which the bar is free to move relative to the mast by sliding in the second holder member.