| 摘要 |
<p>A mobile reach tower crane capable of improving general versatility by using in a normal crane operation and a tower crane operation, and of ensuring safety during work by defining various limitations in response to each operation mode. A main hook (21) is provided to a base boom (61) of a second boom (6), and an auxiliary hook (22) is provided to a upper-end boom (62) of the second boom (6). An operation mode B with use of the main hook (21) or an operation mode A with use of the auxiliary hook (22) can be chosen, in which limitations of the derrick angle, length of the boom, rated load, and boom revolving speed may be defined in each operation mode. <IMAGE></p> |
