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Wednesday, January 25, 2017

Midship section



Container Ship

Purpose of Torsion Box in a container ship:

*       Problems may arise in these vessels due to the lack of torsional strength caused by the large hatches.
*       This problem is overcome to some extent by fitting torsion boxes on each side of the ship.
*       These boxes are formed by the upper deck, top part of the longitudinal bulkhead, sheer strake and upper platform, all of which are of thick material.
*       The boxes are supported inside by transverses and wash bulkheads in addition to the longitudinal framing.
*       These boxes are only effective if they are efficiently tied at their ends.
*       At the after end they extend into the engine room and are tied to deep transverse webs.
*       Similarly at the fore end, they are carried as far forward as the form of the ship will allow and are welded to transverse webs.
*       The longitudinal bulkheads below the box may have to be stepped inboard to suit the shape of the ship, the main longitudinal bulkhead being scarphed into the stepped section.
                                           

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