| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an earth drill machine in which tension applied to a derricking rope does not become excessive even when a gantry is self-propelled in an inclined state.SOLUTION: An earth drill machine 11 comprises: tension measurement means 69 for measuring tension KR of a derricking rope 22 communicating with a control part 90; and derricking winch stop means 65 for driving a derricking winch 23 and stopping the drive of the derricking winch 23 when the tension measured by the tension measurement means 69 becomes or exceeds predetermined tension when erecting a telescopic boom 16. Because tension applied to a pendant rope 221 never becomes or exceeds the predetermined tension, it is possible to prevent the pendant rope 221 from breaking.</p> |
