振动打桩锤利用振动原理进行沉桩或拔桩。它的结构简单、工效高。用以沉制现浇混凝土灌注桩,具有造价低、质量有保证等特点,因而在基础施工中得到广泛的应用。按照有关标准,振动锤的出厂试验需在试验台上进行,以检测电机电流、温升及空载振幅等项技术指标。通常的试验台构造见图1。对于固定偏心力矩的振动锤,电机在起动过程中经常会出现共振现 Vibratory hammers use the vibration principle to sink or pull piles. Its structure is simple and its work efficiency is high. For cast-in-situ cast-in-place concrete cast-in-place piles, it has the characteristics of low cost, high quality, and is widely used in foundation construction. According to the relevant standards, the ex-factory test of the vibratory hammer must be performed on the test bench to check the technical indicators such as motor current, temperature rise and no-load amplitude. The structure of a typical test bench is shown in Figure 1. For vibrating hammers with fixed eccentric moments, the motor often appears resonance during start-up.