Jib system for a vehicle crane comprising a bracing apparatus and method for rigging and de-rigging a bracing apparatus of a vehicle crane

A method for transferring a bracing apparatus from a transport unit onto a jib of a vehicle crane having a jib system, comprising the steps of:

• providing the transport unit having the bracing apparatus received thereon in the region of the vehicle crane such that the bracing apparatus is arranged at least in regions below a front portion of the jib;
• coupling at least one transfer rocker to the bracing apparatus and the jib and coupling at least one tensile element to the bracing apparatus and the jib;
• coupling a lifting cable of the vehicle crane that is deflected on a roller head of the jib to a base frame of the bracing apparatus;
• displacing the bracing apparatus attached to the jib from a set-down position in the direction of a set-up position by retracting the lifting cable coupled to the base frame such that, in terms of an oscillating movement of the entire bracing apparatus attached to the jib via the tensile element, the base frame that is supported on the jib by the at least one transfer rocker is rotated on a circular path around the roller head;
• further retracting the lifting cable coupled to the base frame until an attachment part of the transfer rocker is supported on the roller head or a linear drive connected to the roller head, thus blocking the base frame from being able to rotate further on the circular path;
• changing the length of the linear drive that extends at least indirectly between the attachment part and the transfer rocker or the roller head such that an otherwise unbraked further pivot movement of the transfer rocker is then effected during the rotation of the base frame on the circular path on passing beyond a top dead center of the transfer rocker in dependence upon the change in the length of the linear drive;
• further changing the length of the linear drive in parallel with or without further retracting the lifting cable coupled to the base frame until the base frame of the bracing apparatus is fully placed on the jib;
• fixing the base frame of the bracing apparatus to a fastening region of the jib;
• and
• decoupling at least the transfer rocker from the bracing apparatus before, during or after fixing the base frame of the bracing apparatus to the fastening region of the jib.

A method for transferring a bracing apparatus from a jib of a vehicle crane comprising a jib system onto a transport unit in a vehicle crane system, comprising the steps of:

• coupling at least one transfer rocker to the bracing apparatus and/or the jib and coupling at least one tensile element to the bracing apparatus and/or the jib;
• releasing a base frame of the bracing apparatus from a fastening region of the jib before, during or after coupling of the bracing device to the jib;
• commencing a displacement of the bracing apparatus placed on the jib from a set-up position in the direction of a set-down position by changing the length of a linear drive that extends at least indirectly between an attachment part and the transfer rocker or a roller head, until the transfer rocker is pivoted beyond a top dead center of the transfer rocker;
• coupling a lifting cable of the vehicle crane deflected at the roller head of the jib to the base frame before, during or after pivoting of the transfer rocker by changing the length of the linear drive;
• slackening the lifting cable coupled to the base frame by removing a support of the attachment part of the transfer rocker at the roller head such that, in terms of an oscillating movement of the entire bracing apparatus attached to the jib via the tensile element, the base frame that is supported on the jib by the at least one transfer rocker is rotated on a circular path around the roller head;
• providing the transport unit in the region of the vehicle crane before, during or after the aforementioned measures such that it is arranged at least in regions below the bracing apparatus and/or a front portion of the jib;
• further slackening the lifting cable coupled to the base frame and/or luffing-down the jib until the bracing apparatus is placed at least partially on the transport unit;
• and
• decoupling the bracing apparatus from the jib.