Auvergne-Rhône-Alpes
One of our last services in Lyon was recently the scene of a particularly impressive crane operation. This technical intervention involved the relocation and installation of a 21-tonne transformer and four cabinets, each weighing 400 kg, in the basement of the building. Let's take a look back at a very beautiful crane in negative which proves the know-how of our workers.
The work on the ALVA site required careful planning and extraordinary technical precision. Indeed, handling heavy loads in a confined environment poses unique challenges. The project team not only had to ensure the safety of the operation, but also avoid any disruption to the surrounding work and ensure the integrity of the existing structures.
The major challenge was to tap the crane to the bottom of the basement. This involved passing over the access ramp, a delicate maneuver that required perfect synchronization and advanced technical mastery. The term "negative crane", commonly used by professionals, describes this technique where loads are lowered rather than lifted, a method that, although complex, overcomes spatial constraints.
The preparation of this operation began several weeks in advance. A thorough site survey determined the optimal attachment points and operating angles. The crane used for this operation was carefully selected for its ability to perform precise movements in tight spaces. Every component, from cables to pulleys, has been inspected and calibrated to ensure that it could safely handle heavy loads.
On the day of the operation, the team of crane operators, made up of experienced professionals, coordinated each step with rigor. The installation of the crane required millimetre precision, and each movement was calculated to minimise the risks. Once the crane was in position, the tapping began.
The 21-tonne transformer was the first to be moved. The team had to use advanced techniques to ensure a controlled and gradual lowering of the load. Coordination between operators was crucial; Every crane command had to be executed with absolute precision to avoid any swaying or destabilization of the load.
The access ramp was a major obstacle. As the crane passed overhead, it had to maintain sufficient height to avoid contact with the surrounding structures, while gradually lowering the transformer to the basement. Once the load was close to the ground, the team used guides to steer the transformer to its final position in the plant room.
The four cabinets weighing 400 kg each were then moved in a similar way. Although lighter, their handling required just as much attention. The passage over the access ramp and the controlled lowering were repeated for each cabinet, with the same precision and rigor.
The negative crane operation carried out on this site in Lyon is a remarkable example of the technical competence and coordination of the BOVIS Group's teams. The logistical and technical challenges were overcome thanks to rigorous preparation and the expertise of the professionals involved.
Share on :