Three Gorges Ship Lift For Ship Chamber Of Cable Force Adjustment

It is important to maintain the ship chamber horizontal and keep cable tensions in equilibrium during the running of the hoisting fully balancing type ship lifter.The distributions of displacements and cable tensions are unbalanced because of construction errors. A hydraulic balance system which has 48 oil cylinders is designed to eliminate the unsafe factor. Each oil cylinder includes a pressure holding and limiting device, an oil supply device and oil pipes. The complex equipment is very difficult to control, besides, the reliability should be taken into account.In this paper, a new rectification method replaces the hydraulic balance system to maintain the structure horizontal.The ship-chamber is elastic and its distortion decides the distribution of water load. However the displacements of the ship-chamber are unknowable and how to determine the water load is the key point. The non-linear problem that load is dependent on displacement is analyzed and an iterative method is investigated to solve it. After obtaining the whole loads we optimize cable tension by means of controlling cable length on the basis of influence matrix method.Practical examples are presented to illustrate the process and efficiency of the method. The results indicate that the proposed method here is reliable, convenient and accurate.The method this paper presented can be used as reference for the TGP ship lifter. At the same time, it provides a successful adjustment experience for suspending structures under the load related to displacement.