Because the strength and deformation resistance of piles are better than those of soil, the bearing capacity and elastic modulus of molded composite foundations are also better than those of original soil, which can reduce deformation and improve bearing capacity. When constructing pine piles, use a hammer to press it laterally The original soil at the position of the pile hole is inserted into the pile hole to increase the compaction of the soil within a certain range around the pile and achieve a tightening effect. When the pine pile composite foundation is pressed into the soil between the structural piles, the soil between the piles is compacted, and the piles The bearing capacity of the soil increases and the compactness decreases. Do not promote "pine piles" as "fir piles" or other piles. Common wood is waterproof and quickly turns black, deformed and rotted in water. Especially do not use fir. Of course, there are other woods, such as mahogany, which can be "soaked for thousands of years.

It has the characteristics of high strength and low density, but is light in weight, high in strength, good in elasticity and toughness, and can withstand shock and vibration. Under proper maintenance conditions, the durability will be improved. The joint structure is simple and easy to process, and can be pressed Proceed as follows. Products of various shapes; pine wood has strong hygroscopicity and has swelling and shrinkage effects. When dry pine wood absorbs water, the volume of pine wood expands with the increase in water absorption. Due to the structural characteristics of pine wood, High tensile strength. Resistant to compression, bending and shearing; if pine wood piles are defective, it is easy to see from the outside, and defective wood is not used for important structures. Pilings are wooden piles made of pine wood and are mainly used for Treat soft foundations and riversides. The raw material is pine. Pine trees are rich in rosin, which can avoid corrosion by groundwater and bacteria. It is said that there are "pine trees soaked ten thousand years ago" here, so they are suitable for working under groundwater.

However, pine piles should not be used in places where the groundwater level fluctuates greatly or the groundwater is highly corrosive. The foundation treatment of the famous irrigation project-Ling Canal uses pine piles. The soft soil foundation reinforced by pine piles is a composite foundation. The composite foundation is made of natural foundation soil. Comparing the pine pile composite foundation with other composite foundations, in addition to the different materials of the pile body, there are some similarities. The strengthening mechanism is as follows: Pile body support function: The pine pile composite foundation uses pine wood to replace the pile volume. When the load acts on the same low elasticity and low strength soil, the stress of the foundation is redistributed according to the stress ratio of the pile to soil. The stress gradually concentrates on the pile body, and the stress of the soil around the pile body also decreases accordingly. Most of the load is caused by pine wood. Pile bear.