Based on the type of structure, piers can be grouped into the following two types. The first one is the interlocking sheet piling. This type of pier uses a sheet pile (sheet piling 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. 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, this 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. The advantage of the Sheet Pile Pier Structure is that it does not require dredging under the deck. But the disadvantages or constraints of sheet pile pier structure are needed protection against corrosion, need to improve the land, and still need a sloping post. If you are looking for commonly used, easy to implement, and easier maintenance you could choose a deck on the pile. The deck on the pile (open type structure) uses a series of piles as the foundation for the pier floor. All loads on the pier floor, including forces due to berthing and mooring, are received by the dock floor system and piles on this wharf structure.
In general, the type of mast structure in the Deck On Pile Pier Structure is less sensitive to local vibrations such as underwater collisions due to the bow of the ship than other dock structures. But, the disadvantage of this particular type of structure is a sizable volume of dredging work is required, protection is required on the slope of the ground under the wharf floor, and it is necessary to install inclined piles when the lateral forces are sufficiently large.