Prestressed hollow square piles: a new favorite in construction with excellent seismic performance

1. Basic overview of prestressed hollow square piles
Prestressed hollow square piles, as the name suggests, are a square pile body with a hollow interior. It is a composite structural material formed by applying tension to the steel bars inside the pile body in advance, pouring concrete and waiting for it to harden. This design not only reduces the deadweight of the pile body, but also greatly improves the overall mechanical properties of the material. The hollow structure enables the pile body to more effectively transmit and disperse the load while maintaining sufficient rigidity. It is an ideal basic choice for large-scale projects such as high-rise buildings, bridges, and ports.

2. Centrifugal process: shaping high-quality pile body
In the production process of prestressed hollow square piles, the centrifugal process plays a vital role. The centrifugal method refers to the use of centrifugal force generated by rotation to evenly distribute and compact the concrete in the mold, thereby effectively removing bubbles and excess water in the concrete and improving the density and uniformity of the concrete. This process ensures that the concrete structure inside the pile body is tight and defect-free, greatly improving its compressive strength. At the same time, the centrifugal method also makes the surface of the pile body smooth, reducing the friction between the pile body and the soil, which is conducive to the driving and bearing capacity of the pile.

3. Prestressing technology: strengthening seismic performance
Prestressing technology is another core advantage of prestressed hollow square piles. By pre-tensioning high-strength steel bars in the pile body and releasing this part of the prestress after the concrete hardens, the steel bars can exert the maximum tensile strength when the pile body is subjected to external loads, while the concrete mainly bears compressive stress. This "strengthening strengths and avoiding weaknesses" design optimizes the performance of the two materials. Especially when an earthquake occurs, prestressed hollow square piles can effectively absorb and disperse seismic energy, reduce structural deformation, and prevent pile body fracture or instability with their excellent elastic recovery ability and high strength, thereby greatly improving the seismic safety of the building.

4. Practical application of superior seismic performance
The excellent performance of prestressed hollow square piles in seismic performance makes them the preferred foundation form in earthquake-prone areas. For example, in the reconstruction projects after natural disasters such as the Wenchuan earthquake and the Yushu earthquake, prestressed hollow square piles were widely used in the pile foundations of the reconstruction schools due to their excellent earthquake resistance and construction efficiency, ensuring that these key facilities can be safer and more reliable in future earthquakes. In addition, in the construction of transportation infrastructure such as high-speed railways and urban subways, prestressed hollow square piles have also become a strong backing for the safe and stable operation of these major projects due to their good bearing capacity and stability.