Research Of Hammer-bottom-driven Cast-in-place Pile With Pumping Pressure Concrete

Hammer-bottom-driven cast-in-place pile with pumping pressure concrete(JD-A pile). JD-A pile is a initiated new pile type. the shaft section of which is composed of high-performance reinforced concrete core.The main construction process includes the sink pipes(hammer-bottom-driven), pressure concrete(pumping pressure concrete) and insert reinforcing cage in three steps.Results of the tests have revealed that the new pile type have series of advantages, such higher capacity,The pile quality is stable and reliable,lower cost, shorten the construction period, small settlement,small degree of damage to the environment and so on. Compared with other types of piles also has high energy utilization rate and strong penetration ability. The theoretical design of one post, eliminating the need for direct cap, pile wall place an order can be realized without strip caps or raft, reduce the number of piles, can greatly save the cost of infrastructure targets, in line with the national energy saving, material saving and environmental protection industry policy. Along with the economic and technical indicators,So it is a new type of pile with bright future. The main work is as follows:To investigate the working principle and construction process of the pile, and combined with field prototype test, the test results were analyzed, compared with common pile types. Finally,the application prospect of the use of this type of pile condition was discussed,summarized and put forward feasible suggestions,in order for the project to provide a cost saving,environmental protection, convenient construction of the model pile.