Research on the Key Technology of Stiffening Chord Installation of New Qiantang River Bridge
Taking the stiffening chord of the newly-built Qiantang River Bridge in the Shanghai Hangzhou Ningbo Reconstruction Project as an example,in view of the key and difficult points in the construction of stiffening chord of the steel truss bridge in the past,the key construction technology research on lifting,turning over,installation,closure and other key construction technologies of the special-shaped stiffening chord of the project was carried out.Through theoretical analysis and field test research,a set of steel truss stiffening chord construction technology was developed,providing valuable experience and technical research for the installation and construction of similar stiffening chord in the future.In the lifting and overturning processes of irregular stiffening strings,this article com-bined the design of software modeling during the research process,accurately calculated the center of gravity,sets lifting points,and reduced the safety risks of lifting and overturning.At the same time,the use of three-dimen-sional spatial positioning method has improved the installation accuracy of components such as stiffeners.Finally,three closure methods,namely temperature difference principle adjustment,lifting and landing principle adjust-ment,and jack micro adjustment,were used to cooperate in the closure of the stiffening string,the construction ef-ficiency was greatly improved.
Qiantang River Bridgemulti span long coupletsrigid Suspension bridgestiffener string installation
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