Pile-sinking force modeling and analysis of anti-pull impact pile driver

摘要

A "Rigid body - spring - rigid body - elastic rod - rigid body - spring - elastic rod" impact system dynamics model for an anti-pull impact pile driver is established based on the Newton mechanics and stress wave theory. In the developed model, the force, velocity, and stress curves are acquired by solving the dynamic equations. Influences of system dynamics parameters on the maximum pile-sinking force are discussed. Results show that mass and velocity of the impact hammer, stiffness of buffer spring and pile cap have significant impacts on maximum pile-sinking force, while mass of transmission box and platen have less effects. In engineering applications, maximum pile-sinking force can be controlled by rational allocation and design of pile cap and platen's stiffness. This work can provide some guidelines for the future product optimization design. As a result, impact performance pile drivers with much better can be designed.