The Research Of Pile Anchor Supporting In A Deep Foundation Pit Engineering

Foundation pit construction is a key problem for the modern high-level,high-rise building foundation construction.The pile anchor supporting structure is the combination of the pile with prestressed anchor rod(rope),in order to further improve the stress of the supporting pile in engineering properties,to balance the action of lateral earth pressure,besides using anchor rod(rope)anchor will also set the crown beam and waist beam structure.This paper,taking a commercial high-rise building of the Yellow River in lanzhou city 20 meters deep foundation pit construction as the background,the near river groundwater rich areas of the deep foundation pit construction form of supporting pile anchor bracing system and waterproof and drainage measures are discussed in this paper.Combined with the case of deep foundation pit engineering construction,this paper made the following several aspects:1.Deep foundation pit supporting structure system,according to the characteristic of the foundation pit engineering project,the underground continuous wall and pile anchor bracing and composite soil nailing wall and so on several feasible solutions,contrast analysis from the perspective of technology and economy.2.Formulation of construction organization design: according to the country about the basic engineering design and construction of the latest rules,regulations and the construction site geological and structural characteristics,in reference to similar projects at home and abroad on the basis of construction experience,created the commercial high-rise building construction organization design scheme of deep foundation pit engineering and the groundwater treatment scheme in the construction of foundation pit.3.The foundation pit supporting structure is checked: including the strength and stability calculation of the pile anchor supporting structure,the strength of the ring beam,etc.This article with a building foundation pit engineering construction difficulty is one of the biggest section as an example,the classic method of the profile and elasticity method,the calculation of earth pressure model calculation results are illustrated,the differences of the two methods are discussed in this paper.4.Monitoring analysis of field test: for groundwater water level,the settlement of soil around the foundation pit,the supporting column of settlement,displacement,internal force of retaining structure of foundation pit soil field monitoring,and comparing the calculation results.The construction of the project for the theoretical calculation,design and construction of similar projects in the future,construction organization and accumulated experience worthy of learning,the project has been completed and put into use,construction quality acceptance standard,did not find any quality problem.Construction practice of the engineering cases show that the displacement of surrounding existing buildings demanding,groundwater is rich in adverse circumstances,such as the "tube well precipitation + pile anchor bracing + water stop water stop" comprehensive supporting system of deep foundation pit,high safety,the construction method is simple,the cost is moderate,is a worthy of promoting the construction of deep foundation pit supporting system.