Method for folding self-lifting-type platform truss-type pile legs

Abstract

The invention provides a method for folding self-lifting-type platform truss-type pile legs. The method comprises the following steps: multiple pile leg sections are arranged; at least one pile leg section is folded to a ship body to form a lower part pile leg section on the land; the ship body is launched to float on water and is moored at a dock; lower part pile leg sections and the ship body are kept at a static state in the vertical direction, and the remaining pile leg sections are sequentially folded to the lower part pile leg sections by utilizing a 2000 T crawler crane to form complete pile legs; and the sum of the heights of the pile leg sections which are hoisted and folded through the crawler crane is 15%-16% of the total height of the pile legs. According to the method, overwater hoisting and folding are performed by adopting the crawler crane; the cost for renting a large floating crane and for towing a ship for sailing is omitted, so that the cost is reduced; the crawler crane is flexible for moving, and the utilization rate is high; and pile insertion positioning is not needed, so that the folding cycle is shortened, and the folding efficiency is improved.

Description

Technical field [0001] The invention relates to the field of marine engineering construction, in particular to a method for closing a jack-up platform truss-type pile leg. Background technique [0002] Legs are the key structure of jack-up drilling platforms, and most jack-up drilling platforms choose truss-type legs. The installation of pile legs is mostly made by hoisting and closing multiple pile legs in sections by a hoisting mechanism. At present, the pile legs of large-scale truss-type leg platforms usually have the following methods. [0003] 1. Water towing installation method: In this method, the hull is inserted in the predetermined sea area, the hull is raised and lowered so that the closing opening is roughly flush with the surface of the hull, and the legs to be closed are towed from the hull to the closing opening for closing; The disadvantage of the method is that the hull needs to be raised and lowered, and construction cannot be performed on the platform during th...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for closing the truss-type pile legs of a self-elevating platform, which solves the problem of long closing period, low working efficiency of the closing process, shortened service life of the platform, and large-scale floating crane rental costs in the closing method of the existing platform pile legs. High, limited by land slewing cranes, seriously affected by sea conditions, long-distance offshore platform tugboat transportation costs a lot, and the safety factor is low

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