RING CRANES Ӏ PROFILE


The PTC210-DS can carry up to 4,000 tonnes of counterweight


Safety assessments were carried out at the start of the project. This was essential as surveys found that the dock itself consisted of two L-shaped concrete constructions with softer ground in the middle. A soil survey was conducted at


the proposed location of ring crane and, using this data, calculation models were created to predict the settlement of the soil under its weight. To verify these models, load


tests were carried out at both locations where the ring crossed areas without a dock floor.


LEG ROOM The new leg cranes comprised four main sections to be installed: the pedestal, the rotating platform, the A-Frame, and the 149m mainboom. To enhance stability and control


32 CRANES TODAY


during the mainboom lifts, an LR1800-1.0 crawler crane was used as an assist crane. Working together, the PTC210-DS lifted one end of the boom as the crawler crane lifted the other. Performing this operation


on a busy quay was a challenge that required effective space management. Mammoet’s Schiedam location serves many active projects in Belgium and the Netherlands on a daily basis. The site had to serve as a temporary laydown area for all components being added to the Wind Orca and Wind Osprey, including the large booms.


Lifting height proved another


test for the engineers. At different stages of the operation the vessels had to be raised to a height of 73 metres above the quay using their jacking legs.


Jacking up the vessels to


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