This past December, Sarens was involved in a major tunneling project in Rotterdam in The Netherlands. The project involved the construction of an 11km highway with a 2.2km tunnel. The tunnel was made on the spot and deepened into the landscape. 44 concrete dilatation beams had be placed below groundwater level in the 2.2 km long tunnel floor. Every dilatation beam was prefabricated on two fabrication areas on-site.
Sarens performed the loading, transport on a platform trailer, and triple-lift of 44 individual concrete dilatation beams. Each beam weighed 77T and was 33.1m long, 1m wide, and 57cm high.
The equipment used for the project were:
The team faced a number of challenges but with precise planning and execution the team was able to address them:
Because of the large lifting radius of the AC700, a crawler crane on the other side of the cofferdam had to take over part of the weight to reach the last meters. As a result the tandem lift was modified into a triple lift.
Finally, the dilatation beams were placed in their final location under water. According to the Sales Manager, Operations, Jeroen Blok, “Our very skilled and dedicated crane drivers executed the complex lifting job under water, in combination with the coordination of the lifting supervisor who had radio-contact with the divers too.” He adds, “The complexity of this project was greatly determined by the dimensions and weight of the prefabricated and vulnerable dilatation beams but our team completed the project with excellence.”