Ship Hull and a Method of Manufacturing Such a Hull

Abstract

A ship hull, especially intended for oil and chemical ships, passenger ships are fishing ships, comprising a hull made of steel or aluminium built on a supporting structure of frames, stringers and longitudinals, having improved buoyancy and energy absorbing capability, and a method of manufacturing such a ship. Between an outer hull (200) and an inner hull (202) a layer (204) of a cellular plastic material is applied having chiefly closed cells. The outer hull is made of a high strength steel, wherein at external strain the outer hull and the cellular plastic material are adapted to jointly constitute an energy absorbing deformation zone.

Description

FIELD OF THE INVENTION [0001] The invention relates to a ship hull having a double hull, particularly for oil and chemical ships, passenger ships and fishing ships, as well as a method of manufacturing such a hull. BACKGROUND OF THE INVENTION [0002] Ship hulls of today for merchant ships are without exception built as single or double hulls from plates on frames, stringers and longitudinals, regardless of the field of use. However, in order to obtain increased security, international rules has pushed the evolution towards double hulls. A typical distance between the outer hull and the inner hull is less than approximately 3 m. A framework is arranged between the hulls. [0003] Although double hulls have evidently resulted in significantly increased security at low energy ground impacts, the solution is far from optimal. The construction is significantly more expensive, and the lack of counter pressure from the water on the inner hull give rise to tension problems, whereas the signifi...

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Benefits of technology

[0009] Thus, it is an object of the present invention to provide a ship hull having improved deformation properties in t

Problems solved by technology

Although double hulls have evidently resulted in significantly increased security at low energy ground impacts, the solution is far from optimal.

The construction is significantly more expensive, and the lack of counter pressure from the water on the inner hull give rise to tension problems, whereas the significantly larger total plate area, which is approximately 2,5 times larger than for a single hull, give rise to increased corrosion problems and increased maintenance costs.

At mechanical stress on the outside of the outer hull, it is heavily deformed locally, resulting in cracks in the steel plate.

Moreover, the deformation is transferred by means of a framework between the hulls further on to the inner hull, which

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