Method for righting jacket by using single cantilever gin pole and double hooks

Abstract

The invention provides a method for righting a jacket by using a single cantilever gin pole and double hooks, which utilizes a single cantilever gin pole of a floating crane ship to finish the righting operation of the jacket. The method comprises the fives steps that a transport barge laterally stops at the tail part of the floating crane ship, and a lifting rigging and a righting rigging are connected; a main hook of the floating crane ship is used to lift a jacket, and the transport barge is dragged away from the floating crane ship; the main hook of the floating crane ship is lowered so that a part of the jacket is immersed into sea water; a gin pole of the floating crane ship is lowered to a predetermined angle, and the jacket is rotated to the position parallel to the gin pole of the floating crane ship by using a tug boat; and righting of the jacket is finished by lowering the main hook of the floating crane ship and raising an auxiliary hook of the floating crane ship. According to the method, the single cantilever gin pole is utilized to finish the lifting and righting of large-sized jackets, the marine construction period can be shortened, the requirement for reserve buoyancy by the jacket is lowered, the mounting weight of the jacket is reduced, and the engineering cost is greatly reduced.

Description

technical field [0001] The invention relates to a jacket straightening method, in particular to a jacket single-rod double-hook straightening method suitable for relatively deep seawater. Background technique [0002] Offshore oil exploration platforms are often used in offshore oil development projects, and their structures include jackets and topside modules. Among them, the jacket mainly plays the role of supporting the load of the upper block. The jackets in deep sea water are generally high in height, and the horizontal construction method is often used in the construction process. The jacket of this horizontal construction method needs to be straightened during the installation process. The existing methods for straightening the jacket usually include the following: one is to use the ballast system attached to the jacket, combined with the floating crane to complete the straightening of the jacket. The second is to use the small hole water filling method, combined wi...

AI Technical Summary

Problems solved by technology

[0003] Both of the above two methods require the jacket to be self-floating when it first enters the water. This requires the design of the jacket not only to meet the strength requirements, but also to meet the buoyancy requirements during the installation stage. Some jackets need to add additional buoys to meet the self-floating state. buoyancy requirements, thus increasing the weight of the jacket

In addition, both of the existing two methods need to configure the ballast system, which will inevitably generate additional expenses and increase the project cost

Furthermore, in the offshore installation stage, due to ballasting and removal of buoys, it will also lead to an increase in cost and construction period

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