One of the most used types of docks is CMI LC. This type of pier uses a sheet pile (sheet pile or retaining wall) to withstand the forces due to the difference in elevation between the floor of the pier and the bottom of the pool. Sheet Pile Pier Structure is a type of structure that does not take into account the natural slope of the soil. This type of structure is usually constructed on a steeply sloping coastline where, in general, the land in the sea is then dredged to increase the depth of the harbor pool. The pile is still needed to withstand the lateral forces from the ship that is berth or to help the sheet pile withstand the lateral ground pressure.
This sheet pile structure can be planned using an anchor system or without an anchor. The anchoring system can be in the form of an anchor pole or a stone anchor. For water conditions where the waves are rather large, the Sheet Pile Pier Structure is not suitable because the waves will hit the walls and there will be water swings in the area where the ship is docked. While the deck on pile type is an open type structure that uses several series of piles as the foundation for the pier floor. All loads on the pier including berthing and mooring forces are received by the dock floor system and piles on this pier structure. Under the dock floor, the slope of the land is made according to its natural slope and is covered with reinforcement to prevent soil erosion due to water movement caused by ship maneuvers. To withstand the considerable lateral forces due to berthing and ship mooring, it is possible to install inclined piles.
Apart from sheet piles, the concrete wall diaphragm can also act as a barrier to lateral soil pressure. The structure of the Diaphragm Wall Pier consists of large reinforced concrete blocks arranged in such away. Placement of concrete blocks with a certain slope is intended to cause friction between the concrete blocks to one another to achieve a construction unit capable of carrying vertical (from the pier floor) as well as horizontal loads on the pier.