ZYB液压静力沉桩机液压振动沉桩研究

【作者】 李建强；

【导师】 胡均平；

【作者基本信息】 中南大学 ， 机械设计及理论， 2002， 硕士

【摘要】 在桩基础施工中,液压静力沉桩机以其低噪音、污染小和工作效率高的优良性能获得了广泛的应用,已经成为桩基础施工中一种重要的施工设备。随着不断的应用和开发,其性能也在不断地增加和完善。为了解决在施工过程中遇到砂层导致不能完成施工任务这一问题,在液压静力沉桩机上首次进行了对液压振动压桩系统的设计和研究工作。 液压振动系统的主要特点是在桩机液压系统中的压桩油路产生流体压力变化和波动,从而使沉桩力出现高频的周期变化,产生振动压桩的效果。 本文首先通过对压桩过程的描述和桩与液压静力沉桩机的力学分析,确立了液压振动压桩在桩的强度条件下和液压静力沉桩机工作要求下的压桩频率与压桩力幅值之间的关系;定量分析振动压桩时系统的频率特性,得出了ZYB200B型液压静力沉桩机振动压桩时压桩频率的取值范围和系统能得到的最佳频率值。然后根据液压振动系统设计了振动开关阀,并重点对液压振动系统中的溢流阀和振动开关阀进行了耦合分析和仿真研究,得出压桩油路中流体压力变化的模拟曲线,并根据模拟曲线分析得出流体压力的最高压力值、平均压力值和压桩频率间的相互关系。最后通过现场实验,证实液压振动系统能完成振动压桩工作,实验数据分析表明了压桩系统中流体的压力变化与理论分析相符。 该液压振动系统的设计研究,进一步提高了液压静力沉桩机的性能,促进了液压静力沉桩机向多功能化方向发展。更多还原

【Abstract】 In the pile-driving process, because of its excellent qualities of low noise, low pollution and high working efficiency etc, the HSPD(hydraulic static pile-driver) has already been used widely and has already become an important equipment in the construction work. With continual application and development, its qualities have also been increasingly perfect. In order to solve the problem that the task of the pile- driving process could not be finished because of sandy soil layer. So a new HVS(hydraulic vibrancy system) in the HSPD has been designed and developed .The main character of the HVS is that, by means of fluctuating oil pressure, the pile-driving force can be changed in a higher frequency, and therefore better vibrating effect can be gained.In this paper, on the basis of the description of the pile-driving process and the dynamic analysis of the pile and the HSPD, the relationship between the frequency and the pile-driving force has been established under the conditions of the pile strength and the HSDP working requirements. The frequency character of the ZYB200B HSPD system has been analyzed quantitatively in the vibrancy pile-driving process, therefore the frequency range and the best available frequency have been obtained. Then, according to HVS, the vibrant valve is designed. On the basis of coupling analysis and simulation study of the vibrant valve and the release valve, the simulation curve about the fluid pressure variation in the pile-driving oil pipe is obtained, by which the relationships among the highest pressure value, average pressure value and the pile-driving frequency are obtained. At last, according to the experiment on the worksite, it’s proved that the HVS can work very well. The experiment data prove that the variation of the fluid pressure conforms to the theoretic analysis.The achievements of the design and study about the HVS have further improved the qualities of the HSPD and promoted its developments in multi-functions.更多还原