Method for determining towing load of triangular truss-type pile leg of self-elevating drilling platform

Abstract

The invention discloses a method for determining towing load of a triangular truss-type pile leg of a self-elevating drilling platform. The method comprises the following steps: S1, designing or detecting relevant parameters of the triangular truss-type leg; S2, dividing into seven basic working conditions to respectively calculate the inertial load; S3, respectively acquiring load proportion factors under each working condition; and S4, acquiring the total inertial load, the total inertial load of a rolling condition and the total inertial load of a pitching condition, which respectively are the linear combination of each load. The method disclosed by the invention does not need a direct method to determine the inertial load, and omits the process of constructing a hydrodynamic model, constructing a quality model, analyzing the motion response and forecasting the motion response. The method disclosed by the invention acquires the inertial load by a simplified method, the whole process is concise and fast, and the result is reliable. The operation that the acquired load loaded to a structural analysis model is very convenient, and the working efficiency of analyzing the strength of the leg under the towing condition is greatly increased.

Description

technical field [0001] The invention relates to the technical field of ocean engineering, and more specifically, to a method for determining the towing load of drilling platform legs in the design stage. Background technique [0002] After the jack-up drilling platform is built in the shipyard, it needs to be towed to the operation site by a tugboat. This process is called towage. During the towing process, the legs of the triangular truss stand tall on the main hull. Due to the long length of the legs, the small acceleration of the platform can also cause a large inertial load on the legs, which may lead to Structural damage. Calculating and analyzing the inertial load acting on the pile legs under the towage condition and further evaluating the strength of the pile legs is one of the important tasks to ensure the safety of the pile legs and even the entire jack-up platform structure. [0003] Such as Figure 4 As shown, the self-elevating platform includes three legs, wh...

AI Technical Summary

Problems solved by technology

[0011] The direct determination method involves motion response analysis and motion response prediction. The process of obtaining inertial loads is relatively complicated. In addition, the calculation of wind loads and manual loading of loads make the entire calculation and analysis process very troublesome and low in work efficiency.

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