What are the four different types of piers?

1. Solid piers: These piers are made of solid materials such as concrete or stone and provide strong support for structures.

2. Caisson piers: Also known as drilled piers or drilled shafts, these piers are constructed by drilling a hole into the ground and filling it with concrete or another material.

3. Pile piers: Pile piers are constructed by driving piles (long, slender columns) into the ground to provide support for structures.

4. Floating piers: These piers are designed to float on the surface of the water and are commonly used for docks and marinas.

1. Gravity piers are the most common type of pier. They are made of large, heavy blocks of concrete or stone that are placed on the bottom of the sea or river. Gravity piers are stable because they are very heavy and they resist being moved by waves or currents.
2. Caisson piers are similar to gravity piers, but they are made of hollow boxes of concrete or steel that are filled with water or sand. Caisson piers are less expensive than gravity piers, but they are not as stable.
3. Sheet pile piers are made of steel sheets that are driven into the ground. Sheet pile piers are used to create a temporary barrier against water or to support a structure.
4. Pile piers are made of wooden or metal piles that are driven into the ground. Pile piers are used to support a structure or to create a foundation for a building.