Transportation by sea
(Tool deployed : Pulling cylinders - single acting, spring return)
For the installation of offshore wind farms, the components, including monopiles (hereinafter: MP’s) are transported by sea on specially constructed heavy-lift vessels. Our customer designed the so-called seafastening construction for an installation company ensuring that the MPs remain securely in position, even in the most extreme circumstances.
Pre-stressing ensured with the aid of pulling cylinders
The MPs (weight: 600 ton p/pcs) rest on two support points and are secured to the deck with straps with the aid of a saddle construction. Four straps, each with a pre-stressed capacity of a minimum of 50 tons, must be anchored to each support point. The pre-stressing is ensured with the aid of an auxiliary construction with 2 large stud ends. Holmatro supplied the pulling cylinders, each with a capacity of 60 tons, for this purpose. In view of the fact that cylinders remain in the construction for a long period of time, they were made resistant to the conditions at sea. They were also fitted with special couplings suitable for offshore applications.