Commissioned by yacht builder Oceanco, De Kok Staalbouw supplied the steel structures for the dry dock roof, the heavy mezzanine floors, the swing-out crane tracks, and the caisson (or dry dock door).
The steel caisson is 32 metres long, 12.5 metres high, and 3 metres wide, weighs 290 tonnes, and was produced in our own production halls. The caisson was then loaded onto a pontoon in Vlissingen and transported by water to Alblasserdam. On arrival, a floating derrick crane lifted the caisson from the pontoon and lowered it into position in the dry dock.
The swing-out crane tracks are an extension of the fixed crane tracks in the hall. When the door is closed, these movable crane tracks are positioned parallel to the fixed crane track in the hall. When heavy parts are delivered by water, the crane tracks are swung outwards, and the overhead cranes can travel along them, to a position above the transport. The heavy parts can then be lifted vertically from the transport and brought into the hall. Apart from the steel structural components, we also supplied the complete mechanical, hydraulic, and electrical controls for these swing-out crane tracks.