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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The problem of crane overload protection of the hydraulic static pile driving machine is originally solved by a full hydraulic project through comparison and demonstration in advance in this paper.

本文针对这一实际工程问题在静力压桩机吊机过载机理分析的基础上，通过方案的比较论证，首创性地提出了液压静力压桩机吊机过载保护问题的全液压解决方案。

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