Reducing the initial displacement of piston of lift cylinder, or augmenting the piston diameter of lift cylinder, will reduce the displacement of the platform of hydraulic static pile driver.

• 降低压桩机升降油缸活塞的初始高度，或增大压桩机升降油缸活塞直径，均能减小压桩机加力压桩时压桩机的机身位移。