Introduction to Photovoltaic Reinforced Concrete Pile Column Foundation
The reinforced concrete pile column foundation is divided into two types: cast-in-place reinforced concrete pile columns and precast reinforced concrete pile columns.
The cast-in-place reinforced concrete pile column adopts a circular on-site poured short pile with a diameter of approximately 300mm as the foundation for anchoring the support structure. The pile penetration depth is about 2.0m, with 300–500mm exposed above the ground. The penetration depth is determined based on the mechanical properties of the soil layer. The top of the pile is embedded with steel plates or bolts to connect with the front and rear columns of the upper support structure.
The load-bearing mechanism of the cast-in-place reinforced concrete pile column is similar to that of a reinforced concrete bored pile. It resists the uplift force caused by environmental loads on the support structure through side friction between the pile and the surrounding soil. The downward load of the support structure is borne jointly by the side friction between the pile and the soil and the end-bearing force between the pile tip and the bearing layer.
The construction process of the cast-in-place reinforced concrete pile column involves drilling a hole in the soil layer, inserting reinforcement bars, and then pouring concrete into the hole. Its advantages include material savings, lower cost, and faster construction speed.
Precast reinforced concrete square piles are usually prefabricated in a factory, ensuring uniform shape and consistent pile quality while also offering strong corrosion resistance. Since precast piles are generally driven into the soil by hammering or static pressure, their construction efficiency is high, and the construction period is relatively short.
Moreover, as precast piles are displacement piles, they compact the surrounding soil, enhancing their resistance to uplift. This characteristic effectively prevents the photovoltaic support foundation from being pulled out under strong wind conditions.