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T he strength of a container is in the framework. The framework consists of the following points:
» Corner posts
» Corner castings
» Outer frame
Corner posts
T he corner post is important, because this will support the weight of a container on top of it. If this corner post is damaged, the strength is not 100% anymore and can cause a complete container stack to collapse.
Corner castings (or sockets)
T he corner casting is the place where twistlocks or stacking cones are put, to connect more containers to each other or to make fast to the ship. These sockets are also used for putting lashing bars and for lifting a container with the crane spreader.
The sockets have to be in good condition. If not, it is possible that a twistlock, lashing bar or crane spreader cannot connect properly and cause problems or damage to the container and/or ship.
Outer frame
T he outer frame provides the strength for a container to endure forces onto the container caused by rolling and pitching of the ship. Also the steel plates of the container provide the strength. The outer frame is made up of the side rails of the container.
If there is damage to one of the points, the following can happen:
Warning: If one container in a stack fails because of damage, it can cause the whole stack to collapse!
Remember: For the safety of the ship and crew, it is important that during loading one checks the condition of the containers and reports any damages to containers to the OOW[4].
In image 26, you see the construction of a container.
Image 26: Container construction
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