KR20170033528A

KR20170033528A - Offshore structure installation vessel

Info

Publication number: KR20170033528A
Application number: KR1020150131351A
Authority: KR
Inventors: 김명환; 신상명; 정성훈; 조동호; 최정인
Original assignee: 삼성중공업 주식회사
Priority date: 2015-09-17
Filing date: 2015-09-17
Publication date: 2017-03-27

Abstract

An offshore structure installation ship is disclosed. According to an embodiment of the present invention, the offshore structure installation ship comprises: a hull; a work deck installed to be lifted to an upper portion of the hull; and a jacking system having a plurality of jacking units installed on the work deck and having a plurality of legs of which a lower portion is fixated to the hull, lifted by each jacking unit.

Description

Offshore structure installation vessel

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an offshore structure installation vessel, and more particularly, to an offshore structure installation vessel capable of performing installation work of a structure without lowering the legs of a jacking system on the sea floor,

When a structure such as a wind turbine is installed on the sea, the structure constructed on the land is loaded on the ship and moved to the working position of the sea.

Korean Patent Laid-Open Publication No. 10-2014-0015961 (published on 2014, published on 02.07.07) provides an example of an installation vessel for carrying and installing a wind turbine at sea. This installation ship moves to the working position with the components of the wind turbine loaded. After moving to the working position, the installation work is performed with the legs of the jacking system lowered to the seabed and the hulls raised from the sea level.

However, since such an installation vessel lifts the entire hull by using the jacking system in the course of the installation work, not only a heavy load is applied to the jacking system, but also the collapse of the sea floor supporting the legs of the jacking system The leg of the system could fall. Also, there is a limitation in lowering the legs of the jacking system, which makes it difficult to carry out the installation work in deep water.

Korean Patent Publication No. 10-2014-0015961 (published on 2014, 02.07.07)

An embodiment of the present invention is to provide a marine structure installation vessel capable of performing installation work of a structure without lowering the legs of the jacking system on the seabed and being able to move quickly in the sea.

According to an aspect of the present invention, there is provided a hull comprising: a hull; A working deck installed on the upper portion of the hull so as to be able to move up and down; And a jacking system having a plurality of jacking units provided on the working deck and a plurality of legs each of which is elevated by the jacking unit and whose lower portion is fixed to the hull.

The hull may include a ballast system for controlling diving and levitation, and a propulsion device for propulsion.

The upper part of the hull may float above the water surface during the operation of the ship, and the hull may be submerged during the installation work so that the work deck floats above the water surface.

The hulls may include a first hull and a second hull disposed side by side with each other spaced apart from each other, and a plurality of the legs may be connected to the first hull and a rest to the second hull.

Since the marine structure installation ship according to the embodiment of the present invention supports the legs of the jacking system installed on the working deck while the hull is submerged, the installation work of the structure can be performed without lowering the legs of the jacking system on the seabed. Therefore, it is possible to perform the installation work of the structure while minimizing the influence of the waves, and the installation work can be performed stably even in a place where the depth of the water or the seabed is weak.

In the embodiment of the present invention, when a marine structure is shipped or operated, the upper portion of the hull is floated above the water surface, so that it can be operated at high speed in the same way as an ordinary ship.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a ship for an offshore structure according to an embodiment of the present invention. FIG.
2 is a perspective view of a maritime structure installation ship according to an embodiment of the present invention, showing a state in which the operation deck is spaced apart from the hull by the operation of the jacking system.
FIG. 3 is a side view of a ship for installing an offshore structure according to an embodiment of the present invention. FIG. 3 shows a state in which a hull is submerged and a work deck floats on a water surface during installation work.
FIG. 4 is a side view of a ship for installing an offshore structure according to an embodiment of the present invention.
FIG. 5 shows another embodiment of a ship for installing an offshore structure according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

As shown in FIGS. 1 to 3, the ship for installing an offshore structure according to an embodiment of the present invention includes a hull 10 capable of diving below a water surface or floating on a water surface, A work deck 20 and a jacking system for connecting the hull 10 and the work deck 20 to support the work deck 20 in a liftable manner.

The jacking system comprises a plurality of jacking units 30 provided on the working deck 20 so as to be spaced apart from each other and a plurality of jacking units 30 installed on the jacking units 30 so as to be able to ascend and descend, And a plurality of legs (32) connecting the upper portion of the hull (10).

The jacking unit 30 includes a driving device for elevating each leg 32, although not shown in detail in the drawing. The driving device may include a pinion gear meshed with a gear provided in the leg 32 in the longitudinal direction, and a driving motor for rotating the pinion gear to implement lifting and lowering of the leg. Further, the driving device may be of a type in which the hydraulic binding apparatus clamps the legs 32 and moves the legs 32 in the vertical direction.

The plurality of legs 32 may be formed of a truss-like steel structure having a long length in the vertical direction as shown in the drawing, or may be provided in the form of a long pipe. Further, the lower end is fixed to the upper portion of the hull 10, and the middle portion can be coupled to the jacking unit 30 in a liftable manner. The operation deck 20 can be lifted along the legs 32 by the operation of the jacking unit 30 and separated from the hull 10 or lowered so that its lower surface is in contact with the upper surface of the hull 10.

As shown in Fig. 4, the hull 10 can be provided in a streamlined manner as in a conventional hull, and includes a propulsion device 12 (azum thruster, etc.) having a direction switching function for controlling propulsion and navigation direction do. The hull 10 also has a ballast system (not shown) for adjusting or buoying buoyancy in such a manner as to fill or discharge seawater in the ballast tanks therein.

As shown in Figs. 2 and 3, the hull 10 can be submerged through buoyancy control, and a neutral buoyancy state in which the buoyant force does not sink even in this state can be maintained. That is, the work deck 20 can be supported while the diving state is maintained, so that the work deck floats above the water surface 1.

The working deck 20 is provided to have a size enough to cover the entire upper surface of the hull 10 and is connected with the hull 10 when the hull 10 floats and maintains a state of tight contact with the hull 10, It forms a typical streamlined ship. At the upper part of the working deck 20, a residence 21 and a work crane 23 are provided, and components of a structure such as a wind turbine to be installed on the sea are mounted.

The following explains how to operate these marine structure ships.

1 and 4, when the marine structure is loaded on the working deck 20 or when the marine structure is operated in the marine environment after shipment, the upper side of the marine vessel 10 is floated above the water surface 1, The work deck 20 is lowered. That is, the upper surface of the hull 10 floats above the water surface, and the lower surface of the working deck 20 is kept in close contact with the upper surface of the hull 10.

In this state, the installation ship can ship many structures on the work deck 20 and can maintain a stable state. Also, since the hull 10 is floating on the water surface 1, it can be operated at a high speed in the sea and can be moved to the work position similarly to an ordinary vessel.

When the installation vessel reaches the working position, the operation deck 20 is raised by the operation of the jacking unit 30 as shown in FIGS. 2 and 3, and then the boat 10 adjusts the buoyancy I will sink through. That is, the ship 10 is submerged while maintaining the neutral buoyancy, and the work deck 20 remains floating on the water surface 1. Since the working deck 20 is supported by the plurality of legs 32 on the ship 10 under diving, the working deck 20 can be stably supported while minimizing the influence of the waves. The shaking can be minimized because the hull 10 in the submerged state and the work deck 20 located on the water surface are hardly influenced by waves. Therefore, stable installation work of the marine structure can be performed in this state.

In addition, since the ship 10 supports the work deck 20 in a diving state, the installation ship can perform the installation work irrespective of the depth of the work area. In other words, it does not have to lower the legs of the jacking system down to the seam as in a normal installation ship, so that the installation work can be stably performed even in a deep water or a weak ground.

Since the ship can be propelled even when the ship 10 is submerged as in the example of FIG. 3, it is possible to perform near shift or posture change in the work area.

FIG. 5 shows another embodiment of a ship for installing an offshore structure according to the present invention. The example of FIG. 5 is a form including a first hull 101 and a second hull 102 which are arranged side by side with each other. The legs 32 of the jacking system may be connected partly to the first hull 101 and the remainder may be connected to the second hull 102.

10: hull, 12: propulsion device,
20: working deck, 23: crane,
30: Jacking unit, 32: Leg.
.

Claims

hull;
A working deck installed on the upper portion of the hull so as to be able to move up and down; And
A plurality of jacking units provided on the working deck; and a jacking system having a plurality of legs each of which is raised and lowered by the jacking unit and whose lower portion is fixed to the hull.

The method according to claim 1,
The hull is a marine structure installation vessel including a ballast system for controlling diving and levitation and a propulsion device for propulsion.

3. The method according to claim 1 or 2,
The installation vessel
The upper part of the hull is floated above the water surface during operation,
An offshore structure installation vessel in which the hull is submerged during installation and the working deck remains floating above the surface of the water.

The method according to claim 1,
Wherein the hull comprises a first hull and a second hull disposed side by side with each other spaced apart from each other,
Wherein the plurality of legs are partly connected to the first hull and the remainder is connected to the second hull.