Device for a movement and mutual assembly of segments of an excavation battery , like for example auger or rod segments, for making up said excavation battery and for connecting said excavation battery to a digging machine , said device comprising: - an upper joint integrally connectable in a removable manner to a driving tube or to a rotary head of said digging machine ; - a lower joint integrally connectable in a removable manner to a segment of said excavation battery to be made up, said lower joint having an inner passing duct with a necking in its intermediate portion; - a flexible element that connects said two joints being constrained with one own end to said upper joint and connected with the other own end to said lower joint so that said lower joint is slidable along said flexible element moving with respect to said upper joint between a disengaged extended position, in which said joints are separated and are capable of transferring only an axial pull through said flexible element , and an engaged contracted position, in which said joints are adjacent to and engaged with one another to transfer torque and axial forces from said driving tube to said excavation battery being formed; - a stop element that limits the sliding of said lower joint away from said upper joint along said flexible element , said stop element comprising a ballast constrained to the lower end of said flexible element and positioned below said necking , said ballast having a section greater than said necking and smaller than the inner passing duct of said lower joint ; - when the device is in the contracted position the stop element comes out of the inner duct of the lower joint and goes into a position below a lower edge of the said lower joint . - an upper joint integrally connectable in a removable manner to a driving tube or to a rotary head of said digging machine ; - a lower joint integrally connectable in a removable manner to a segment of said excavation battery to be made up, said lower joint having an inner passing duct with a necking in its intermediate portion; - a flexible element that connects said two joints being constrained with one own end to said upper joint and connected with the other own end to said lower joint so that said lower joint is slidable along said flexible element moving with respect to said upper joint between a disengaged extended position, in which said joints are separated and are capable of transferring only an axial pull through said flexible element , and an engaged contracted position, in which said joints are adjacent to and engaged with one another to transfer torque and axial forces from said driving tube to said excavation battery being formed; - a stop element that limits the sliding of said lower joint away from said upper joint along said flexible element , said stop element comprising a ballast constrained to the lower end of said flexible element and positioned below said necking , said ballast having a section greater than said necking and smaller than the inner passing duct of said lower joint ; - when the device is in the contracted position the stop element comes out of the inner duct of the lower joint and goes into a position below a lower edge of the said lower joint . <EOS>