Theoretical Calculation and Parametric Study of Floating and Sinking Process of the Steel Tube with a Large Diameter

In order to study the influence of different condition parameters on the process of floating transportation of steel guard cylinder, taking the floating transportation and sinking of 3.9 m super-large diameter steel guard cylinder of a continuous rigid frame bridge pile in Suichang, Zhejiang Province as an example, the basic working principle of the floating transportation method of super-large diameter steel guard cylinder and the process of floating transportation and sinking in the construction process are studied. The water entry depth of the steel sheath under different equilibrium tilt angles is discussed and the corresponding theoretical calculation formula is given. When the balance tilt Angle is fixed, the influence of the water inlet velocity and water inlet area on the speed and water entry time of the steel sheath is studied, and the corresponding theoretical calculation formula is put forward respectively. The results show that the floating method of steel protecting tube sinking construction can effectively guarantee the accuracy of the liners of the large diameter into the water, improve the overall stability of the sinking process of the steel liners, reduce the risk of the steel liners capsized, for rational selection of the steel liners of the construction conditions to provide the corresponding theoretical support, and for the future similar steel protecting tube into the water sink to provide the corresponding reference.