In the time of pressing the pile, the grout are inject into the soil. When the pile tip reaches the design depth, then continue to inject grout into the pile, so that the pile head expand.
在压桩过程中同时在桩侧注入浆液，桩尖达到设计深度后，浆液随着桩的沉入在桩端形成注浆扩大头。
A hydraulic vibratory system is developed for vibratory pile pressing. It can produce variable pressure with a specified frequency in hydraulic circuit for hydraulic static pile pressing machine.
为液压静力沉桩机液压系统的压桩油路中产生一定频率压力变化，实现振动压桩而研发了一套液压振动系统。
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