| 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. |
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