Model Zyb Hydraulic Static Pile Driver Pile Clamping Jaws Study

As high buildings' popularizing, pile foundation's construction must be improved. The promotion of construction asks for new pile equipments as well as for types and methods of pile. China has already set special pile machinery equipments as one of the key items during "ten-fives" period.Pretensioned spun high siieuglh coucrcic pile, a new generation of pile, has been used widely now. However, there are still many problems such as the dimension of the clamp system is not precision enough. There needs a new method to calculate the dimensions of pile for the stress in the pile is not well-distributed. The solution of the problem will supply the theory foundation for using PHC pile.After combining the working principle of the ZYB series hydraulic static pile-driver with the practical situation at the working site and studying the macroscopic force of the pile and microscopic strength of concrete, the author has designed a new set of clamps - adjusting clamps independently.This thesis has emphasized that the effective contact area between the pile and the clamp is not as the design dimension but restricted by the length of the clamp and the press force of the pile-driver. Also the stress' distributing and size in the pile is related with the length of clamps. So, the length of clamps is set as the key dimension in the thesis. After analyzing both the distribution of stress and strength of the pile, with the knowledge of elastic mechanics, contact mechanics and material mechanics, the thesis has offered a new sei of algorithm to calculate the length of the clamps. "MATLAB software is used to search the appropriate length of the clamp for the complicated calculation.