Brief Analysis of the Characteristics of Steel Pipe Piles

Steel pipe piles are widely used in various situations such as supporting piles and friction piles. Especially when used as supporting piles, because they can be fully driven into a harder supporting layer, the bearing function of the entire cross-sectional strength of the steel can be exerted. Even in a deep and soft soil foundation of more than 30m, steel pipe piles can be sunk into a more solid supporting layer and can fully exert their bearing capacity. In general, the main characteristics of steel pipe piles are:

1. Able to withstand strong impact forces. Because they can withstand strong impact forces, their penetration and penetration performance are excellent. If there is a hard interlayer with a small thickness and a standard penetration number IV = 30 buried in the foundation, it can be smoothly penetrated. It can penetrate a solid supporting layer according to design requirements.

2. Large bearing capacity. Since the steel used as the parent material of steel pipe piles has a high yield strength, as long as the piles are sunk into a solid supporting layer, a large bearing capacity can be obtained.

3. Large horizontal resistance and strong resistance to lateral force. Since the steel pipe pile has a large cross-sectional rigidity and a large resistance moment to the bending moment, it can withstand a large horizontal force. In addition, a large diameter thick-walled pipe can be used. Therefore, it can be widely used in mooring posts, abutments, and piers that withstand lateral forces.

4. The design is flexible. The wall thickness of each single pipe of the steel pipe pile can be changed as needed, and the outer diameter that meets the design load requirements can be selected as needed.

5. The pile length is easy to adjust. When the surface of the pile tip support layer is uneven, the prepared piles will appear long or short. Since the steel pipe pile can be freely welded to lengthen or gas cut to shorten, it is easy to adjust the length of the pile, so that the construction can be carried out smoothly.

6. The joints are safe and suitable for long-size construction. Since the steel pipe pile makes it easy to make a welded joint, the pile sections are spliced, and the strength of the joint is equal to that of the parent material, the burial depth that meets the needs can be determined.

7. It is easy to combine with the upper structure. By pre-welding the steel bar to the upper part of the pile, the steel pipe pile can be easily combined with the upper cap concrete. It can also be directly welded to the upper structure, thus ensuring that the upper and lower parts work together.

8. Minimum soil discharge during piling. Steel pipe piles can be driven in through an opening, the cross-sectional area of soil discharge is relatively small, and the driving efficiency is high. It also has the following characteristics:
a: Small disturbance to the soil foundation.
b: No adverse effect on adjacent buildings (structures), and very intensive piling construction can be carried out on a small site.
c: Most suitable for high-rise buildings, large machinery and equipment foundations, harbor structures, etc., which are projects with large loads in a small area.
d: Easy to carry and stack. Steel pipe piles are light in weight, so there is no need to worry about damage, and they are easy to carry and stack.
e: Save engineering costs and shorten the construction period.

Since steel pipe piles have many of the above characteristics, if these characteristics can be fully utilized in actual projects, the construction period can be shortened. Steel pipe piles are most suitable for rapid construction. Therefore, its comprehensive economic benefits are high and it can save engineering costs relatively speaking.