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Different kinds of hybrid structures have been applied
to harbor facilities along with the progress of design and
manufacturing technologies. Our company has been
implementing R&D projects on hybrid structures for harbor
facilities.
This paper reports two recent achievements.
1) Barge loading of a prefabricated steel shell to be
immersed at a site. A new loading technology was developed,
which enabled loading of a heavy prefabricated
structure onto a barge in a short period of time. The
technology enabled sliding of the shell welded with skids
on the skid supports. The contact surface of the support
was clad with Teflon boards to reduce friction while
pushing the shell onto the barge. This technology was
applied to the loading of the No.2 shell section for the
Naha submerged tunnel. The loading onto the barge was
successfully completed in about two hours.
2) Study on estimating the effect of wave pressure on
caisson footing. A hybrid caisson is featured with its
long footing. The current design practice does not consider
the effect of wave pressure on footing. An experimental
study with models of long footing was conducted
to estimate the effect. An empirical formula was
derived for accurately estimating the resultant pressure
acting on the footing. |
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