Bored Pile And Ring Beam Bracing System In Deep Foundation Pit Support Design And Application

In recent years along with our country city to change the rapid development ofconstruction， lack of land resources has become increasingly, land prices rising, cityconstruction to aerial and underground development is an inevitable trend, in order to save thecity construction land, reasonable adjustment of land use structure, a large number ofhigh-rise, super high-rise building as bamboo shoots after a spring rain as springing up. Alongwith these high-rise, super high-rise buildings and underground space development andutilization, large deep foundation pit engineering continue to emerge, deep foundation pitengineering complexity and importance also is shown increasingly come out, be in the field ofcivil engineering is a hotspot and difficulty. Ring beam retaining structure began in1987，It isproved by practice in deep foundation pit in soft soil foundation using particular pile andannular inner support system has a lot of advantages，especially in super large deepfoundation works in the use of large diameter ring beam supporting the economic benefit ismore outstanding. Ring beam support system possesses the advantages of low investment,high security, strong stability, small deformation, convenient construction, short constructionperiod and many other advantages. Ring beam system can improve the utilization ratio ofconstruction machinery, to provide greater operating space, ensure the infrastructureconstruction of continuity, than other methods for a wide range, especially in the soft ground,the venue under the narrow conditions to better play its role. Therefore, it is suitable retainingstructure is designed according to the characteristics of the excavation engineering excavationengineering solved.In view of the present our country the development characteristics of deep foundation pitengineering, foundation Pit Support Technology, the deep foundation pit engineering in easyoccurrence problem and development trend, the design of deep foundation pit supportingprinciple and common support types and applicable conditions, based on the collection of thedeep foundation pit deformation stability related literature data base, summary of deepfoundation pit supporting structure research, the Tianjin airport area international trade centerproject of deep foundation pit support, sealing structure of, summarize for Binhai New Areaof soft soil site condition of deep foundation pit supporting, watertight plan, accumulation insoft soil area of large area of the excavation of deep foundation pit engineering design,construction experience,achieved a certain social economic benefit and practical significance,for the future in center city of deep pit engineering construction has accumulated someexperience.