Analysis Of Deep Foundation Pit Supporting Design And Method Of Beijing 35 Middle School Engineering

Now the urban construction and the underground rail transit construction to a higher and deeper development, as the increased densi ty of buildi ngs, and the deepening depth of foundation pit(from several meters to 10 meters, some even reached more than 30 meters), the surroundi ng environment conditions of the foundation pit supporti ng would also be becoming more and more complex. How to select the reasonable structure of foundation pit supporti ng forms, and to excavate deep foundation pit in the narrow space safely without affecti ng the surrounding environment is the major problem facing the supporting design and construction.Based on the design and construction of foundation pit engi neering 35 middle school in Beijing, consideri ng the factors of cooling towers adjacent to subway station, the wi nd pavilion, Luxun's former residence, no ground subsidence causing and no surroundi ng structures safety affecting, we design the appropriate foundation pit supporti ng scheme, select the corresponding construction technology, and analyze the monitori ng data. Mai nly i ncludes the following contents:(1) By reviewed a large number of deep foundation pit supporti ng design and construction of relevant information domestic and overseas, we summarized the characteristics of the foundation pit supporti ng the mai n form and the supporting system in Beijing area under different engi neering geological conditions, which as a reference to the design and construction of foundation pit in this paper.(2) According to the design of the i nformation collection and the actual situation of the scene, based on the characteristics and difficulties of 35 middle school in Beijing foundation pit supporting project, we studied and analyzed the design i n the process of choosi ng the targeted supporting structure system, designed the supporti ng structure of slope protection pile plus prestressed bolt supporti ng and protecti ng piles plus steel support form with smaller deformation duri ng the process of construction, which to ensure the safety of the excavation and surrounding environment.(3) According to the design scheme, we studied the appropriate technology choosi ng in construction process, and each item difficulty encountered regularly in the construction process and the solving measures.(4) We designed the construction monitoring program, through analyzing the previous monitori ng data, determined the monitoring indicators i n the normal range of foundation pit, and proved the rationality of the design and construction.This article expounded the calculation process of complex surrounding environment of foundation pit supporti ng design scheme, the construction method and the sa fety monitoring measures, which hopes to provide a reference for similar foundation pit supporting design and construction.This article took a surroundi ng complex environment foundation pit supporti ng design for example, put forward the complete process o f design calculation, construction method and safety monitoring and control measures, which hopes the research to provide a reference for similar foundation pit supporting design and construction.