Method for integrally folding semi-submersible drilling platform

Abstract

The invention discloses a method for integrally folding a semi-submersible drilling platform. The method comprises the following steps of: preparing before folding, namely preparing hoisting equipment and an oriented positioning device; hoisting and folding on site, namely shipping a barge for a deck box into a dock, hoisting the deck box and positioning at a certain height position by using the hoisting equipment in the dock; shipping a lower hull into the dock and positioning below the deck box; dropping the deck box on the lower hull; positioning the deck box and the lower hull by using the oriented positioning device; sequentially welding the deck box and the lower hull which are positioned well; and unloading tensile force which is applied to a position corresponding to the deck box by the hoisting equipment one by one according to the welding process until all welding positions meet load bearing requirements. By the method, the folding operability is improved, and the cost of labor force is reduced; and the method is high in economical efficiency, is not limited by surging and has short folding time and high folding accuracy.

Description

technical field [0001] The invention relates to a method for integral closing of a drilling platform, in particular, a method for independently manufacturing the upper hull (deck box) and the lower hull (lower hull) of a semi-submersible drilling platform, and performing integral closing by hoisting the upper hull Methods. Background technique [0002] At present, the closing methods of semi-submersible drilling platforms mainly include: [0003] 1. Heavy-duty lifting method: that is, the loading method in the dock, using heavy cranes in the dock to build the hull modules layer by layer from bottom to top. The advantage of this method is that it does not rely on large-scale lifting equipment; its disadvantage is that the construction period is long, it takes a long time in the dock, it relies on multiple lifting equipment, it is expensive, and it needs to solve a large number of hoisting technical problems. [0004] 2. Floatover method: After the upper and lower hulls are ...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at above-mentioned problem, provides a kind of semi-submersible drilling platform whole closing method, this method can make semi-submersible drilling platform upper hull (deck box) and lower hull (lower hull) manufacture independently respectively, to solve the problem of heavy lifting method The construction of the drilling platform requires a long period of time, takes a long time in the dock, and is expensive, etc.; and solves the problem that the float-over construction of the drilling platform requires high water depth and sea surface calmness, and the size and load of the barge are limited by the size of the platform.

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