The dismantling process of the fixed pulley sliding platform under the deck

Abstract

The invention discloses a process for dismantling a fixed pulley sliding platform under the deck. The roller trolley and the track arranged on the sliding platform are used to transport the cutting pieces to the bottom of the deck hole, and the cutting pieces are transported to the deck through a hoist on the deck; It can effectively avoid the high-risk lowering and sling removal problem caused by the overall lowering to the seabed, and avoid the subsequent salvage operations caused by the lowering of the sliding platform to the bottom of the water. The skid platform only needs to use one winch, which shortens the preparation time of construction tools and eliminates the risk of coordination caused by the need for two winches to lower the overall lowering. The destruction of the electrical instrument pipeline, the demolition under the deck and the lifting and reverse transportation on the deck can be carried out simultaneously, which greatly shortens the construction time of the demolition and reserves sufficient time for the subsequent debugging of the fixed pulley.

Description

technical field [0001] The invention relates to the field of offshore petroleum engineering, in particular to a process for dismantling a fixed pulley sliding platform 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, a fixed pulley for lifting and guiding is usually installed at the bottom of the platform deck. The platform is installed by sliding, the platform is spliced ​​with 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 fixed pulley is installed. Since the sliding platform is suspended under the bottom deck, at an altitude of 60 meters above the water surface, and the platform is slender and rectangular, the method of removing the sliding platform a...

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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