What are the characteristics of steel pipe piles

Steel pipe piles are widely used in various applications such as bearing piles and friction piles. Especially when used as bearing piles, they can be driven fully into relatively hard supporting layers, thus maximizing the load-bearing capacity of the entire cross-sectional strength of the steel. Even in deep, soft soil foundations exceeding 30m, steel pipe piles can be driven into relatively solid supporting layers and fully utilize their bearing capacity. In summary, the main characteristics of steel pipe piles are:

1. Steel pipe piles can withstand strong impact forces. Due to their ability to withstand strong impact forces, they have excellent penetration and embedment performance. Even if there are thin, hard interlayers in the foundation with a standard penetration test (SPT) blow number of approximately 30, they can be easily penetrated. They can penetrate solid supporting layers according to design requirements.

2. Steel pipe piles have high bearing capacity. Because the steel used as the parent material of steel pipe piles has high yield strength, as long as the pile is driven into a solid supporting layer, a large bearing capacity can be obtained.

3. Steel pipe piles have high horizontal resistance and strong resistance to lateral forces. Because of their high cross-sectional stiffness, steel pipe piles have a large resistance moment against bending moments, enabling them to withstand significant horizontal forces. Furthermore, large-diameter, thick-walled steel pipes can be used. Therefore, they are widely used in mooring piers, bridge abutments, and other applications that bear lateral forces.

4. Steel pipe piles offer high design flexibility. The wall thickness of each pipe can be varied as needed, and the outer diameter can be selected to meet design load requirements.

5. The length of steel pipe piles is easily adjustable. When the surface supporting the pile tip is uneven, prepared piles may be of varying lengths. Since steel pipe piles can be freely lengthened by welding or shortened by gas cutting, the length is easily adjusted, facilitating smooth construction.

6. Steel pipe piles have safe joints, making them suitable for long-length construction. Because steel pipe piles are easy to weld together, and the joint strength is equal to that of the base material, the required embedment depth can be determined.

7. Steel pipe piles are easily integrated with the superstructure. By pre-welding the reinforcing bars to the top of the pile, the steel pipe pile can easily integrate with the concrete of the upper foundation. It can also be directly welded to the superstructure, thus ensuring coordinated operation between the upper and lower structures.

8. Steel pipe piles require minimal soil removal during driving. Steel pipe piles can be driven with an open section, resulting in a relatively small soil removal cross-sectional area and high driving efficiency. This also provides the following advantages:

a: Minimal disturbance to the soil foundation.

b: No adverse impact on adjacent buildings (structures), allowing for very dense piling construction in small areas.

c: Ideal for high-rise buildings, foundations for large machinery and equipment, and harbor structures—projects where large loads are applied over small areas.

d: Easy to handle and stack. Steel pipe piles are lightweight, eliminating concerns about damage, and are easy to handle and stack.

e: Saves on project costs and shortens the construction period. Due to the many advantages of steel pipe piles mentioned above, fully utilizing these advantages in actual engineering projects can shorten the construction period. Steel pipe piles are best suited for rapid construction. Therefore, they offer high overall economic benefits and can relatively save on project costs.