Design and Construction of the Deep-water Double-walled Steel Cofferdam for Beijiang Super Major Bridge
Relying on the Beijiang Super Major Bridge project,the design and calculation of the deep-water double-walled steel cofferdam were carried out,and the precise sinking positioning technology was studied.Firstly,considering multi-ple factors comprehensively,Rhino software was used for modeling.A double-walled steel cofferdam with a height of 23.045 m and an outer diameter of 19.5 m was designed.The finite element analysis using Midas Civil was used to calculate that the stiffness,strength and stability of the double-walled steel cofferdam as a whole and its components met the specifica-tion requirements.Secondly,the construction process and rapid and accurate sinking positioning technology of deep-water doub-le-walled steel cofferdam were explored,and the accurate sinking limit device and accurate positioning construction method were developed.The effect of the construction method was verified in practical application,and the construction key points of bottom sealing concrete technology and cofferdam recovery technology were briefly expounded.Finally,through engineering practice,the reliability of finite element calculation and the feasibility of accurate sinking positioning technology were verified.The research results can provide reference for similar projects.
Beijiang Super Major Bridgedouble-walled steel cofferdamMidas Civilfinite element calculationpre-cise sinking positioning technology
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