Research On The Key Technology Of Pile Foundation Construction Under Complicated Geologic Conditions Of Highway Reconstruction Project Wuxian

Since the planned economy,China's economic development has undergone enormous changes,especially since the reform and opening up,urbanization increased year by year,a substantial increase in the vehicle population has increased significantly,passage way the usual level crossing does not meet the modern society has long development needs.The rapid development of domestic infrastructure,the paper focused on the problem of urban viaduct construction proposed under the current complicated geological conditions,through the study and practice of urban viaduct construction summed up the key technologies under complicated geological conditions of a molding for the subsequent construction of the building of the city viaduct provide a favorable reference and direction.Karst features undermine the continuity of engineering geological conditions,difficulty karst formations Bored construction will be in here.Under normal circumstances,karst formations erosion,grooves or cave,mostly horizontal direction of development,it's a different size,shapes and sections of the trend sometimes peaks and valleys sometimes,or suddenly wide suddenly narrow,winding,and multivessel hole.Construction of knowledge through practice,karst cave formations perfect for the most unfavorable Bored construction.For different types of caves,take clay or stone tablets with filling,sealing curtain or layered pre-grouting,steel casing follow-up treatment measures,such as different technologies to solve the drilling process under conditions of Karst Geology easy hole collapse problems,improve a pile into the hole rate,cost savings,ensuring pile construction quality.The traditional construction techniques need to break the trailer coupling strength of concrete up to 70% before construction,the overall construction methods to enhance the broken trailer coupling without waiting pile of concrete strength of 70%,in the early trailer coupling can be removed and for a complete pile of no effect,reducingconstruction time and shorten the construction period.Because of China's land area is large,the geological conditions of different regions and different,and therefore the presence of various regions of their different construction problems,yet unable to form a set of trial and under complex conditions nationwide construction of key technologies,has not been studied for geological conditions need to continue to explore.