Foldable derrick structure for a ship

Abstract

The present invention relates to a foldable derrick structure for a chip. The foldable derrick structure allows the chip to pass a shipping line with an above-water height limitation through folding the derrick thereby reducing time and cost in ship navigation. The derrick structure comprises the following components: a derrick which comprises an upper derrick component, a lower derrick component and a hinge coupler that couples the upper derrick component with the lower derrick component, while the upper derrick component is vertically divided into a first derrick component and a second derrick component; a first hydraulic cylinder which is set for the first derrick component; and a second hydraulic cylinder which is set for the second derrick component. The first derrick component and the second derrick component are driven by the first hydraulic cylinder and the second hydraulic cylinder for being rotated and folded relatively to the hinge coupler and the lower derrick component which is fixed to the ship and is supported by the ship.

Description

technical field [0001] The present disclosure relates to a foldable boom structure for a ship, and more particularly, to a structure that allows a ship (eg, a drilling ship, etc.) having a boom crane to easily lower the ship by folding the boom crane. The height in turn passes through the collapsible boom structure for ships in routes with height restrictions over water. Background technique [0002] In general, a drill ship refers to a ship that explores marine resources such as oil, gas, etc. in deep sea by drilling a seabed, and includes a fixed platform type, a semi-submersible type, a drill ship type, and the like. These ships are equipped with fixed derrick cranes on their decks, which are of complex shape and consist of beams and various drilling rigs. The boom crane is also referred to simply as a "boom". [0003] The boom is a kind of tower crane, which is installed close to the moon pool setting of the drilling ship and includes all drilling equipment. The boom ...

AI Technical Summary

Problems solved by technology

In this case, in order for the ship to pass such a route, it is necessary to remove the boom with a complicated structure, but it is actually difficult to remove the boom from the deck

In particular, for the part of the boom that is connected to the deck by welding, not only the boom cannot be disconnected from it, but even if the welded part can be disconnected from the boom, it is difficult to reduce the height of the boom

Therefore, drillships bypass such routes, thus requiring additional time and cost to sail to their destinations

[0005] In addition, since the boom has a height of 100m or more, the drill ship has a high center of gravity (COG) due to the boom, resulting in deterioration of floating stability during ship navigation

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