Vibratory pile driving is to install a high-power vibratory pile driver on the top of the pile, and use vibration force to reduce the resistance of the foundation soil to the pile. The excavator pile driver vibrates the pile body with high acceleration, and transmits the vertical vibration generated by the machine to the pile body, so that the soil structure around the pile body changes due to vibration and reduces the strength. The soil around the pile body is liquefied to reduce the frictional resistance between the pile side and the soil body, and then the pile is sunk into the soil by the pressure of the excavator, the vibrating sinker and the weight of the pile body. The pile driving efficiency is very high in sand, and it can also be used for sinking and pulling out steel sheet piles and steel pipe piles.
The water jet driving method is also called the water jet driving method. It is an auxiliary method of hammering method and vibration method. Using high-pressure water flow, through the water jet pipe installed on the side of the pile or in the hollow pile, the soil around the pile tip is loosened to reduce the sinking resistance of the pile. Generally used in sandy soil layers with high efficiency. When the pile tip sinks to about 1 to 1.5 meters from the design elevation, water jetting should be stopped, and the pile should be sunk to the design elevation by hammering or vibration.