Precise installation method and structure for butt joint of split type jacket foundation and upper module of large offshore electrical platform

Abstract

The invention provides a precise installation method and structure for butt joint of a split type jacket foundation and an upper module of a large offshore electrical platform. An auxiliary platform is arranged on the outer side of a preset position of a rear installation split jacket, a guide structure and a space arrangement measuring device are fixedly arranged on the auxiliary platform, the split jacket is installed after precise positioning, the rear installation split jacket and the auxiliary platform are temporarily welded, and the offshore installation and upper module butt joint precision of the split type jacket of the large offshore electrical platform is improved when the upper module is installed through a floating support by combining a connecting joint between the upper module of an adjustable conical plate and the jacket, and the butt joint precision is controlled within 10mm.

Description

technical field [0001] The invention relates to a precise installation technology for docking the foundation of a split jacket of a large-scale offshore electrical platform and an upper block, and is applicable to the field of offshore wind power generation. Background technique [0002] With the large-scale development of offshore wind power in my country, the output of offshore wind power is becoming more and more important, and its investment proportion is also increasing. Offshore wind power output generally has two schemes: AC and DC. For AC output, an offshore step-up station is required, and for DC output, an offshore converter station is required. With the continuous expansion of the scale of offshore wind farms, whether it is the continuation of the offshore booster station scheme or the flexible DC transmission scheme, the number and weight of the main electrical equipment have increased significantly, making the size of the offshore electrical platform greatly inc...

AI Technical Summary

Problems solved by technology

However, if the error in the LMU plane is too large, it will make it difficult for the main column of the upper block to be smoothly located in the receiver in the LMU structure, and the float-over cannot be completed, and the upper and lower connection structures need to be re-modified

What's more, under the motion of the ship, the main column of the upper block directly collides with the LMU whose position is deviated or a huge eccentric bending moment is generated when the load is transferred, causing the jacket to be damaged, and the floatover installation cannot be completed. The jacket needs to be repaired. In severe cases, the jacket needs to be rebuilt and the site re-planned. The routing of electrical cables will be changed, causing huge economic losses.

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