| With the development of economy and society,the number of basic deep-water bridge foundation projects in China is increasing,and the construction difficulty is gradually increasing.The locked steel pipe pile cofferdam is a commonly used construction technology for cofferdam structures,compared with other The advantages of cofferdams are obvious.The traditional design method of this type of cofferdam is to analyze the mechanical components of the steel pipe pile cofferdams respectively.Through the analysis and design of the bearing capacity of each component,finally design a safe and stable Cofferdam structure.However,with the assumption of safety and the simplified model analysis,it is impossible to obtain a particularly accurate result to guide the construction of the overall structure of the cofferdam,and there are some potential problems.For a very large bridge project,a small deviation may cause serious consequences for the actual project.Therefore,the use of finite element software to simulate the construction process for mechanical analysis is of great guiding significance for design and construction.This paper combines the deepwater foundation capping project of the Honghete Bridge on the western link of the Hong Kong-Zhuhai-Macao Bridge,focusing on the application and advantages of the locked steel pipe pile cofferdam in the deep water foundation.The following work was done:(1)The characteristics of the deep-water foundation cofferdam are introduced in detail.According to the actual engineering hydrogeological conditions,the advanced nature of the 13# main pier of the Honghete Bridge using the locking steel pipe pile cofferdam is expounded and the main bridge pier lock is introduced in detail.Steel pipe pile cofferdam.(2)Through the study of the failure characteristics of steel pipe piles and the calculation method of cofferdam,the stability of steel pipe piles,the strength of diagonal braces,transverse braces,and the strength of cofferdams were checked.(3)Using ANSYS finite element software to establish a three-dimensional model of cofferdam,the steel pipe pile adopts Shell 63 unit,the cofferdam adopts Beam 188 unit,and the life and death unit is set in the inner support of each layer to simulate the actual construction process to the entire lock steel.The numerical simulation analysis of the pipe pile cofferdam is carried out.The deformation law of steel pipe pile,cofferdam,diagonal bracing and gusset under different working conditions is obtained by finite element calculation.The stress of steel pipe pile,cofferdam stress,diagonal bracing and transverse The data such as the support stress are numerically analyzed and compared,and the model is gradually improved.(4)By comparing the data obtained by the traditional calculation method and the finite element simulation construction process analysis method,it is found that the data obtained by the traditional calculation method has great safety tolerance,and several reasons are summarized.(5)By comparing the data obtained by finite element analysis and finite element simulation construction process analysis,it is found that the simulated construction process can more accurately predict the most dangerous stress point of the cofferdam structure during the construction process.In this paper,the actual engineering construction process is simulated,and the finite element analysis of the whole lock pipe steel pipe cofferdam is carried out by life and death.The variation law of the cofferdam structure is obtained,which provides a guiding basis for construction and design.According to ANSYS analysis,For the large-scale cofferdam structure problem,the numerical analysis using finite element software has a strong practical significance and can make a certain contribution to the actual project. |
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