Process for dismantling fixed pulley sliding platform under deck

Abstract

The invention discloses a process for dismantling a fixed pulley sliding platform under a deck, the process comprises the following steps: transferring a cutting piece to the lower part of a deck hole by using a roller trolley and a track arranged on the sliding platform, and transferring the cutting piece to the deck through a winch on the deck; the fixed pulley sliding platform under the deck can be efficiently and safely segmented and cut off, the high-risk lowering sling dismantling problem caused by the scheme that the whole sliding platform is lowered to the seabed is effectively avoided, and the situation that the sliding platform is lowered to the water bottom to cause follow-up fishing operation is avoided; only one winch is needed for dividing and lifting the sliding platform, the machine preparation time of constructors is shortened, the matching risk caused by the fact that two winches are needed for overall lowering is eliminated, and the platform structure and an electric instrument pipeline are fully prevented from being damaged when the deck hole is used for lifting and transporting a cutting piece. Under-deck segmentation dismantling and on-deck lifting and transferring work can be carried out synchronously, the dismantling construction time is greatly shortened, and sufficient time is reserved for follow-up fixed pulley debugging.

Description

technical field [0001] The invention relates to the field of offshore oil engineering, in particular to a process for dismantling a sliding platform with fixed pulleys under the deck. Background technique [0002] During the construction of the truss-type semi-submersible platform, in order to lift and install the platform riser, it is usually necessary to install fixed pulleys for lifting and guiding at the bottom of the platform deck. The platform for mobile installation is spliced ​​by steel frame, and the vertical column on the sliding platform is welded with the main beam of the platform deck. In order not to affect the operation and debugging of the fixed pulley, the suspended fixed pulley sliding platform needs to be removed after the installation of the fixed pulley is completed. Since the skid platform is suspended under the bottom deck, at a height of 60 meters above the water surface, and the platform is thin and rectangular, it is very difficult to remove the wh...

AI Technical Summary

Problems solved by technology

Since the skid platform is suspended under the bottom deck, at a height of 60 meters above the water surface, and the platform is thin and rectangular, it is very difficult to remove the whole skid platform and use the platform crane to lower it to the bottom of the water. It is not only necessary to find two The opening position of the lowered steel wire rope must be free from obstacles in the vertical direction from the top deck to the bottom deck, which will seriously damage the platform structure. During the lowering of the sliding platform, there will be collisions with the auxiliary parts of the semi-submersible platform ship bypass; Subsequent salvage operations are required after reaching the bottom of the water, complex construction equipment and facilities need to be prepared, and the dismantling cycle is long, which affects the subsequent commissioning of the fixed pulley

High-altitude lowering operations are difficult and risky

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