The Construction Technology Of Secant Boring Pile And The Prospects In Xi'an

With the ongoing urbanization and the development of underground works, led to the deep pit, the general direction of development has become an inevitable trend. Excavation of new forms to become a hot topic of current research. To the form of excavation ,security, economic and reasonable is main requirements. Secant Piling is one such new envelope. Through this study,hope to break the process currently used only in the soft soil limitations and to contribute to the promotion of the secant piling use for the future of Xian in China.This paper investigates large quantities engineering in other parts of the use of Secant Piling technology of slope support engineering. Take one Project in Shenzhen for example,which use the secant piles of deep excavation, and summarizes construction technology process, preparation of ultra-retarded concrete and mechanical selection of the more common Secant Piling.This paper summarize common form of the current slope support form in Xi'an,and take a certain subway deep foundation project in Xi'an as an example which use bored piledeep and to analyze the advantages in the sealing of secant piling technology.End of the article summarizes the process, super retarding concrete composition and selection of machinery and equipment in Xi'an.In equipment selection, casing drilling and rotary drilling rig used in conjunction,which both meets the quality and the speed requirements of the pile.This study also points out the shortcomings,hope to play a guiding role of the Secant Piles technology application in Xi'an area.