A segment of the 110-year old truss construction is dismantled.
VarioBase makes bridge building possible
The solution to the extremely narrow crane direction area is VarioBase – the variable support base from Liebherr. This innovative support system enables each individual crane support to be extended to an arbitrary length whilst the crane controller permanently calculates the maximum load capacity values.
Swiss crane contractor Senn completes the job with its LTM 1160-5.2 and LTM 1130-5.1 mobile cranes. Both feature VarioBase and can be erected without any problems on the narrow bridge for the night-time tandem hoists.
Load distribution plates specially made for this job were placed under the supports. These ensured that the support pressure was distributed perfectly on the bridge structure.
Senn AG positioned the cranes at the side on the edge of the road and extended their supports on the side away from the load: the supports were extended to only 19 percent of their possible extension length. On the installation side of the cranes there was sufficient space to extend the sliding struts to their maximum length.