No.4 company of China Railway 21 Bureau and Ruo railway project department adopt new technology for Bored Pile Construction

On November 15, with the roar of machinery, the first "full casing follow-up" bored pile construction of Xiaowan super major bridge of No.4 company of China Railway 21 Bureau and Ruo railway project was fully and smoothly drilled

and if the railway is located in the hinterland of Taklimakan Desert, the main engineering construction site geology is complex and changeable, most of which are silty fine sand, silty soil layer and quicksand layer, etc. in addition to the difficulty of land acquisition and demolition, the temporary land can not be used, resulting in the narrow construction site and serious reduction of project progress. In addition, desert geology, drilling construction and its complexity, the traditional reverse circulation drilling pile construction is easy to collapse, making the original tight schedule even worse

in order to ensure the timely implementation of the erection period, the project department actively communicates and coordinates with the owner and the design institute. After repeated investigation, the "full casing follow-up" construction of rotary drilling has the advantages of quick hole forming effect, high quality, shortening the construction period and improving the economic benefits in the construction of large area foundation piles. The project department decisively decides to adopt a new process and formulate the "full casing follow-up" of rotary drilling Enter "construction scheme After several overnight commissioning and pile test efforts, the "full casing follow-up" construction was successfully drilled, which effectively ensured the orderly development of Heruo railway construction and laid a solid foundation for the next stage of work. (Chen Yali)