Difference between Internal and External Piles
Piles, also known as桩，are essential components in the construction industry, providing stability and support to foundations and structures. They are typically used when the soil conditions are not suitable for traditional shallow foundations. There are two main types of piles: internal piles and external piles. This article aims to highlight the key differences between these two types of piles.
Internal Piles
Internal piles, also referred to as driven piles or driven shafts, are constructed by driving a pile into the ground using machinery. This method is commonly used in areas with poor soil conditions, such as expansive soils, soft clays, or when the groundwater table is high. The main characteristics of internal piles are as follows:
1. Construction Process: Internal piles are driven into the ground using a pile driver, which applies force to the pile until it reaches the desired depth or encounters a hard layer of soil.
2. Material: Internal piles can be made of various materials, including wood, steel, concrete, or a combination of these materials.
3. Load-bearing Capacity: Internal piles have a high load-bearing capacity, making them suitable for heavy structures.
4. Maintenance: Internal piles generally require minimal maintenance, as they are designed to withstand harsh environmental conditions.
External Piles
External piles, also known as bored piles or cast-in-situ piles, are constructed by excavating a hole in the ground and then filling it with concrete or another suitable material. This method is often used in areas where soil conditions are more favorable, or when the structure requires a more precise foundation. The main characteristics of external piles are as follows:
1. Construction Process: External piles are created by excavating a hole in the ground using a boring machine. The hole is then lined with steel or another reinforcing material before being filled with concrete.
2. Material: External piles are typically made of concrete, with steel reinforcement to enhance their load-bearing capacity.
3. Load-bearing Capacity: External piles have a moderate load-bearing capacity, making them suitable for medium-sized structures.
4. Maintenance: External piles may require more maintenance than internal piles, as the concrete may be subject to environmental factors such as freeze-thaw cycles.
Conclusion
In conclusion, the difference between internal and external piles lies in their construction methods, materials, load-bearing capacities, and maintenance requirements. Internal piles are driven into the ground and have a high load-bearing capacity, making them suitable for heavy structures. External piles are created by excavating a hole and filling it with concrete, with a moderate load-bearing capacity and potentially requiring more maintenance. The choice between the two types of piles depends on the specific project requirements and soil conditions.
