Container Lashing
Containers are locked together using twistlocks (zakretne brave). They come in
many variations but their purpose is to lock the container stack together at the
corner posts.
With further development in the industry during the 1970s and 80s, the size of
containerships continued to grow, with 9-high stowage in holds and 4-high
stowage on deck becoming commonplace and the industry began to wake up to
the fact that standards in lashing were required. Ships were, at this stage, still
supplied with loading computers that continued to calculate a ship's stability,
shear forces, bending and, occasionally, torsion moments (zakretni moment,
torzija). Very few had the capability to calculate dynamic loads on container
frames and lashing systems caused by ship motions and wind forces. And so the
lashings were still applied throughout the stow in accordance with the
manufacturer's manual.