Construction technology of special-shaped concrete cable tower with slim waist and single column in marine environment
The five main towers of two cable-stayed bridges in Huangmaohai cross-sea passage all adopt slim waist single-column special-shaped concrete pylon,which has beautiful shape and simple structure.The structure and construction environment are complex,and it is difficult to design formwork and climbing frame with drastic cross-section changes.There are a large number of steel bars,low efficiency of high-altitude binding and high safety risk,and it is difficult to control the thickness of protective layer,which affects the durability of concrete in marine environment;C55 concrete has a series of construction problems,such as large cement consumption,high hydration heat,high cracking risk of plain concrete with 8cm protective layer,etc.Construction technology of reinforced block parts;A series of construction measures,such as optimizing the mix proportion,adding viscosity modifier and adding basalt fiber in the protective layer,have solved the related technical problems,ensured the construction quality,improved the construction efficiency,reduced the safety risk,and completed the construction of special-shaped concrete pylon quickly and with high quality,which provides reference for the construction of similar projects.