Pine wood piles are wooden piles made of pine wood. They are mainly used to treat soft foundations, river embankments, etc. The raw material is pine wood. Pine wood is rich in rosin, and rosin can well prevent corrosion by groundwater and bacteria, and has "water immersion" Therefore, pine piles are suitable for operations below the groundwater level. However, pine piles are not suitable for areas where the groundwater level changes greatly or where the groundwater is highly corrosive.

Soft soil foundations reinforced with pine piles are classified as composite foundations. Composite foundations are composed of natural foundation soil and pile bodies. Compared with other composite foundations, pine pile composite foundations are similar except for the different materials of the piles. Its reinforcement mechanism: the supporting role of the pile body: the pine pile composite foundation uses pine piles to replace the low-modulus, low-strength soil with the same volume as the pile body. When receiving external loads, the stress in the foundation is redistributed according to the pile-soil stress ratio .The stress gradually concentrates towards the pile body, and the stress borne by the soil around the pile is reduced accordingly. Most of the load is borne by the pine pile. Since the strength and deformation resistance of the pile are better than those of the soil, the bearing capacity of the composite foundation after formation is , the modulus is also better than that of the original soil, thereby achieving the effect of reducing deformation and improving bearing capacity.

Generally, pine wood piles are not treated with antiseptic treatment. They are just live wood pine trees picked from the mountains and immediately pounded into the mud. As the ancients said: "Pine wood will be dry for a thousand years and wet for a thousand years, and half a year if it is not dry or wet." Remember that in Qianjiang Haiding Yanguan During seawall management, clearing out the pine wood piles laid by the Qing Dynasty from the sea cement is no different from harvesting pine wood from the mountains now.

The customary anti-corrosion method for pine piles is to lightly carbonize the surface of the pine piles, scorch the surface layer with fire, and then apply asphalt on it. This method is generally not used now, but it is still a good idea for temporary construction. The method is simple, economical and effective, especially with an excavator and pine piles, making the construction more convenient.