Pullout test of screw pile foundation

Based on the bearing capacity characteristics of vertical pull-out screw pile foundation,the limiting embedded depth of first layer lamina(LED)and the limiting space between of laminas(LSB)are proposed according to Meyerhof bearing capacity theory of deep foundation and limiting equilibrium mechanics.

With more and more super-length concrete structure buildings with the pile foundation have been constructed, the temperature stress of super-length concrete structure has become one of vitally important research topics in structure design This paper elaborates the reason of cracking, and the related theory of pile lateral direction stiffness.

Application of bionic surface on blades of screw pile;

Pitch of screws and bearing capacity of screw piles under ultimate load;

The loading translation of screw pile on pullout test under inclined loading

Application of spiral pile into CSPC Nanhai project;

Present institution of research on various pile driver systems for preventing flood and rushing to deal with an emergency is described, and a new type of pile driver system, named spiral pile driver system for preventing flood and rushing to deal with an emergency is put forward and developed.

The paper mainly expounds the timbering and water cutting mechanism and the technology of pouring concrete piles drilled in long twisted bar when they are used in foundation excavations.