Bulletin 2/2010 - Siempelkamp NIS

A design with many “special effects”
Since the building, including the wooden roof construction, was
existing at the time the contract started, one challenge was not
to exceed the maximum given wheel loads. For us that meant
considering the maximal allowable total weight of the crane
installation for every construction step and to save weight without
sacrifi cing the structural engineering of the grab crane. For a
better distribution of the wheel load onto the crane runway
girder, the crane was equipped with joint end carriages including
eight wheels per crane track side.
An important customer requirement was that no stored material
would remain on the side walls, front walls and dividing walls of
the storage depot after emptying of the compartments. Due to
the minimum approach dimensions resulting from this, the crane
bridge as well as the double-rail trolley had to be designed as
compact as possible. Approach dimensions of crane and trolley
that are optimally adjusted to the conditions in the building
allow for the dual scoop grab to cover and completely empty the
entire storage area in all four compartments.
The fi nished crane system prior to acceptance by Siempelkamp Krantechnik
SIEMPELKAMP | NUCLEAR TECHNOLOGY
The implementation of the optimized lifting height also called for
a special solution. Here, all necessary clearances during the move
of the grab over the dividing walls of the compartments and over
the customer‘s bulk storage bunkers had to be taken into
account. Because of the existing building height, this could only
be carried out with special measures, for example, by using a
compact special hook block for the grab.
Since the crane cannot be reached via lifting platforms during
normal operation when the depot is full, we have equipped the
crane bridge and trolley with maintenance catwalks and platforms.
The effect: All components are accessible for maintenance
and repair purposes; safe working conditions for the service
personnel are guaranteed. Optimizing the approach dimensions
resulted in extremely tight spaces for the inspection works on the
crane and trolley. One solution for this included traveling
platforms that can be brought in when needed. In this way the
crane approach dimensions could be optimized and at the same
time, maintenance and repair works on components can be
performed safely.