Hydraulic Static Pile Driver Partial Pile Mechanism And Countermeasures,

As the representation of concrete piles construction methods, hydraulic static pile driver technology has many advantages, such as high efficiency, low working intensity, less noise, no pollution, and so on. Particularly ,it shows more superiorities in constructions of the forelands and the alluvial plains where the hold-force layers stand deeply. However, the phenomenon of pile gradient appearing in the construction process has been constraining the development of the technology.Aiming at the phenomenon of piles' gradient under the condition of horizontal machine body, the thesis has done some analysis and research on it. Firstly, the paper interprets the harms and the causes about the phenomenon. Then ,according to the requirement of national construction criteria, pile intension and machine intension, the author works out the max permitted deviation of pile gradient. To solve the problem, a new hydraulic system is designed and a series of simulations and experiments are made to check the invention's effects. In addition, the paper also improves the mechanical structures and gives some technological process requirements about them.It is worthy of mentioning that the paper builds the permitted pile gradient deviation for the first time and invents a new pile system with special functions, such as buffer function ,flow and load compensate ability. The new system can avoid the flutter of machine body and improve the synchronism ability, which benefits the decrease of pile gradient. In short, The analysis and experiments show that the design is economical and useful, it will bring expected effects in the practical field.