The correct answer is D. All the above.
Piles are usually driven by diesel operated hammer, drop hammer, or single acting steam hammer.
- Diesel operated hammer: A diesel operated hammer is a type of pile driver that uses a diesel engine to power a piston that strikes the top of the pile.
- Drop hammer: A drop hammer is a type of pile driver that uses a weight that is dropped from a height to strike the top of the pile.
- Single acting steam hammer: A single acting steam hammer is a type of pile driver that uses steam to power a piston that strikes the top of the pile.
Each type of pile driver has its own advantages and disadvantages. Diesel operated hammers are the most common type of pile driver because they are relatively inexpensive and easy to operate. Drop hammers are the most powerful type of pile driver, but they are also the most expensive and difficult to operate. Single acting steam hammers are less powerful than diesel operated hammers, but they are also less expensive and easier to operate.
The type of pile driver that is used will depend on the specific project. For example, if the project is located in a remote area, a diesel operated hammer may be the best option because it is self-contained and does not require a power source. If the project is located in an urban area, a drop hammer may be the best option because it is more powerful and can drive piles deeper into the ground.