Dredging and grappling

With our wide range of hydraulic and wire-mechanical grapplers, we can excavate all kinds of soil, both on land and at sea. We have box grapples and orange peel grapples with both wire and hydraulic closing mechanisms. Our grapples range in size from 1.5 to 6.5 cubic metres, weighing from 2 to 12.8 tonnes. Our grapples have the world’s largest biceps.

Crane Norway Group is a specialist in excavating the seabed for deepening quays, harbours and waterways. The work is carried out from boats, barges or from land and we can arrange for transport to dumping sites both by road and by sea. For underwater work, we generally use heavier and highly robust grapples that can withstand heavy loads and are able to dig even in hard layers.

Cranes and grapples allow for the efficient replacement of bogs, soil, rock, morainic material, clay and other uncompacted material in connection with road construction, excavation of sheet pile boxes and the erection of other structures. The typical working radius of the machine is up to 30 metres with unlimited depth. For excavation in virgin terrain, equipment adapted to the nature of the soil is used to optimise production.

Bulk materials from boats can be unloaded at quays. We often use larger and lighter grapples that are optimised for high production based on the weight of the bulk material. At the same time, the equipment has been adapted to prevent damage to the hull and the cargo compartment.

With a crane grapple, distance and depth are no challenge. Excavation can take place with great reach and to great depths. During grappling and dredging, cranes are subjected to high dynamic forces. Our sturdy belt cranes are perfectly suited for this type of material handling.