Mechanical Analysis And Experiments Of Two-way Helical Closed Screwed Drilling Machine

In geotechnical engineering field,Modern pile foundation can be divided into three categories: ordinary pile, partial-displacement pile and displacement pile according to the influence of the construction method of pile to soil. Displacement pile keep developing as one of development direction of modern pile foundation in recent years. Two-way Helical Closed Screwed Drilling Machine. is one of the latest research results of displacement pile.The drilling method of Two-way Helical Closed Screwed Drilling Machine achieved in the soft soil area, such as Shanghai district. But in hard soil area such as Beijing district, because of stratum large resistance, it needs further research and improvement in drilling rig design and how to reduce the drilling torque.For this purpose, some research were done based on the manufacturing bit of China promotes Beijing engineering technology Co., LTD. First, ordinary helical drilling machine is a kind of tools of bearing soil and transportation soil. The principles of it and deduced theoretical formula are analysed. According to the theoretical formula, the author analyzed the effect of spiral angle of spiral vane and the range of angle are obtained according to the theoretical formula. The conclusion is got from the research: sand and soil are relatively stationary when Two-way Helical Closed Screwed Drilling Machine is screwed drilling. Second, the author took the mechanical analysis of screwed tools with no spiral vane during drilling process and deduced the calculation formula of axial force and torque on the basis of the analysis. Furthermore, the mechanical analysis of spiral vane of screwed tools during drilling process and deduced the calculation formula of axial force and torque were done. Third, the theoretical formula is verified through the experiments. Finally, a series of conclusions are obtained which show practical significance to the improvement of Two-way Helical Closed Screwed Drilling Machine and drilling operation according to the contrast of the theory formulas and experimental data .t F...