The original type is a bridge-shaped berthing facility in which stakes are driven into the sea to facilitate docking and disembarking of ships, and upper facilities such as concrete or iron plates are installed on it.
However, it gradually changed and instead of stakes, well vessels, air caissons, ordinary caissons, and pedestal structures were installed to make upright parts, and they were used by connecting it horizontally.
When the structure of the jetty is installed parallel to the naked eye, a revetment is created behind it and the rear becomes reclaimed land. This is called a shore bridge.