Arctic heavy-tonnage carrier and ice-resistant pylon for connecting the ship underwater and above-water bodies

Abstract

The invention applies to shipbuilding dealing with the construction of Arctic heavy-tonnage carriers. The Arctic heavy-tonnage carrier comprises an underwater cargo hull and above-water body in the form of the main deck with a superstructure. The underwater hull is connected to the main deck with an ice-resistant pylon along which the ship load waterline passes and which is located in the fore body of the underwater hull directly behind the forepeak symmetrically related to the center plane of the ship hull. The upper deck of the underwater ship hull has in the area of the pylon a strengthened construction. The pylon structure is a bearing one for the main deck. The underwater hull can be made in the cross-sectional view to the shape of a round-angled rectangle the height of which is 10-12 m and a height-breadth ratio does not exceed 1:6. The underwater hull of said ship has along each side the aft arranged retractable mooring bollard. The ice-resistant pylon for connecting the ship underwater hull to above-water body is executed in the form of a strength longitudinally and transversely framed hull having in the plan view a long and symmetrical shape. The pylon breadth or diameter is significantly less than that of the ship load hull as well as the practical width of channel to be laid by the icebreaker. The pylon height provides the movement of the main deck above the ice surface and underwater hull—beneath the lower ice edge. The invention enables to increase the ship heavy ice-breaking capabilities when going after the icebreaker in the Arctic shelf areas with shallow waters as well as to decrease the ship navigation resistance in broken ice and decrease the height of ship underwater hull.

Description

FIELD OF THE INVENTION[0001]The invention relates to sea-going heavy-tonnage carrier intended for operation simultaneously with the ice-breaker in Arctic ice fields, including the shallow depths conditions in Arctic shelf.BACKGROUND OF THE INVENTION[0002]For economic efficiency of heavy-tonnage carriers they are constructed presently of rather large capacity and consequently with large principal dimensions, viz length, breadth, depth and draft. Such ships are intended mainly for navigation in ice-free water areas.[0003]Delivery of cargoes to Arctic regions in autumn and spring seasons is effected, when floating after the icebreaker, by surface ice-class ships with a displacement from 10 to 20 thous tons. In ice of small thickness (up to 1 m) such method of ice-breaking assistance, regardless of ship's slow speed, is considered as effective. However, when ship is going after the ice-breaker in ice of larger thickness such method of ice-breaking assistance becomes ineffective as the c...

AI Technical Summary

Benefits of technology

[0010]The major engineering result achieved at realization of invention consists in the reduction of area of ice belt of the carrier and decrease of resistance to ship navigation in broken ice, as well as reduction in underwater hull height.

Problems solved by technology

However, when ship is going after the ice-breaker in ice of larger thickness such method of ice-breaking assistance becomes ineffective as the carrier is nipped by arctic ice in the ice belt reducing thus significantly ship's speed down to her stop.

This reduces the choice of ways of cargo transportation and makes impossible the operation of such tankers in shallow depths conditions of Arctic shelf.

For arctic 2-3 m thick ice fields the ship ice-crushing devices will not be able to replace the high-power nuclear icebreaker.

Furthermore, when ship is floating after the icebreaker, the heavy arctic field ice bits will be found between the ship stanchions thus impeding the ship floating.

And in case of freezing of such ship in the ice field her release with the ice-breaker becomes impossible as the ship construction does not envisage the icebreaker approach so as to release the ship from the ice inside of her stanchions.

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