Midship section

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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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