Study On Application Of Large Opening Reverse Construction Method In Foundation Pit Engineering

With the development of economy, accelerating urbanization, the development of large underground space has become a necessity, which effectively promoted the rapid development of deep foundation pit project. Because of deep foundation pit construction facing site intense, short construction period, complex geological conditions, surrounding facilities protection and many other problems, lead to the traditional reverse method in foundation pit engineering construction is getting more and more difficult. Major malignant in foundation pit accidents continue to occur, Construction production safety situation is getting worse. So studying the large opening reverse method application in foundation pit construction has important theoretical and practical significance.The paper summarizes the shortcomings of traditional reverse method in foundation pit construction practices, improves the construction technology of large opening reverse method in the process of technology innovation, and analyzes its advantages、disadvantages and scope. The key technology of a large opening reverse construction method:determine the opening position and size, positioning and vertical control technology of the temporary post, Liang Banzhu node processing, wall and floor roof waterproof technology construction process conducted in-depth research. This paper combine with the project of Wuhan Wangjiadun Rail Transit Center Station actually completed the large opening reverse construction method excavation and pile engineering construction program, and simultaneously measure dynamic monitoring in the construction, application of information feedback method to ensure the construction safety.Paper from two aspects of the theoretical research and engineering practice to study the large opening reverse method key technology in deep foundation pit engineering, it has a certain reference value to the design and congstruction of similar projects in the future.