The Application Research Of Screw Drill Press Concrete Stake Technology In The Complex Foundation

With the development of our country's national economy, the complex foundation with rigid stake has been increasingly used in the high-rise building. Due to its features of high intensity of single stake, strong weight bearing capacity and little transmutation, normally it is used in the foundation treating of the high-rise building in the north of China. The screw drill press concrete stake technology has already been used in many complex foundation projects since it was developed. It preferably solved the difficulties of forming hole in weak layer. It can be widely used in different geology conditions with the characters of high speed of forming stake, short time used, high efficacy. Compared with the mud on wall form hole technology, clash stake technology or vibration sink pipe technology used in complex foundation stake forming, it has advantages of no vibration, no pollution, and no noise. In addition, since the concrete pressed into the drill stem sent vibration free concrete to the pump, so it is easy to ensure the quality of the stake body. Compared with the mud on wall and dry work form hole technology, the side obstruction and end obstruction of screw drill press concrete stake have all been accordingly improved, the weight bearing is better, and the transmutation of the complex foundation is less. Along with the application in the high-rise building of the complex foundation with rigid stake.this technology will have much wilder application prospects.Based on the screw drill press concrete stake technology, via the practical application of this technology in complex foundation form stake, this thesis goes deeply into the screw drill press concrete stake equipment and technology parameter in complex foundation, the weight bearing of the formed stake, the factors that affect the stake quality, and its practical application in the project and its social and economic benefits.The research reveals that in the complex foundation, the application of screw drill press concrete stake technology is feasible. It has notable effects in reducing the sedimentation of the complex foundation, ensuring the stake quality of the basic stake, improving the weight bearing capacity, saving costs, and cutting time limit. In addition, some references and suggestions on choosing design parameters of screw drill press concrete stake in complex foundation have been provided in this research.