Mammoet has begun replacing 19 crane girder beams as part of the modernisation of central production units at a thyssenkrupp Steel oxygen steel plant in Duisburg, Germany.
With crane girder beams measuring between 30 m and 45 m long, 5 m high and weighing up to 160 tonnes apiece, Mammoet used its Move3D engineering platform as part of its planning for the project at thyssenkrupp Steel’s facility. It was used to analyse obstacles and height restrictions as well as visualise all operations and crane positions for the duration of the work.
Construction was split into two phases, the first of which saw seven girder beams replaced. Mammoet selected two Liebherr cranes – an LTM 1750-9.1 and LTM 1650-8.1 – for the majority of the heavy lifting work. The removal, reinstallation and transport of the first five crane girder beams utilised this equipment along with six axle lines of SPMTs.
However, not all girder beams could be replaced in this way and Mammoet’s engineers therefore devised a customised gantry system for the remaining two beams that were difficult to access. The system comprised two towers on which skid tracks were placed in the transverse direction of the hall. A longitudinal beam was then installed on these two skid tracks, on which two strand jacks could be moved.
The strand jacks were attached to the first beam to lift it out of position and move it across the skid tracks towards the centre of the hall. The beam was pushed using the strand jacks and the skid track in the direction of the Liebherr LTM 1750-9.1, which took over the load at the first lifting point. The LTM 1750-9.1 together with one of the strand jacks then moved the unit until the load could be transferred from the LTM 1750-9.1 to the LTM 1650-8.1. The 750-tonne capacity crane was then able to swing back and pick up the beam at the other end from the second strand jack. The second beam followed in the same procedure.
With the first construction phase completed safely and on time, the second will now follow.
Last week, HLPFI reported that Mammoet had moved and installed equipment for a carbon capture and utilisation (CCU) plant in Germany.
