KR101684369B1 - A Marine Structure - Google Patents

Abstract

An offshore structure is disclosed in which a door pool is formed on the hull.
The offshore structure includes: a recess formed on the door frame; A first recess-forming member provided under the door frame to form the recess; A second recess forming member which moves up and down along the inner side wall of the door frame; And driving means for providing a driving force to move the second recess forming member up and down.

Description

{Marine Structure}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offshore structure, and more particularly, to an offshore structure configured to reduce seawater flow occurring in a recess.

Along with the development of submarine mining technology, drilling lines have been developed with drilling facilities suitable for marginal field or deep sea oil development. Conventional submarine drilling has been mainly used for a rig ship or a rigid platform for underwater drilling that can be sailed only by another tugboat and performs submarine drilling with anchorage at one point of the sea using a mooring device. In recent years, a drill ship, which is equipped with advanced drilling equipment and manufactured in the same form as a ship, has been developed and used for underwater drilling so that it can be sailed by its own power.

In such an offshore structure for underwater drilling, a moon pool is formed for accessing various equipment for drilling. The moon pool is a rectangular parallelepiped or cylindrical space formed so as to penetrate vertically between the deck and the bottom of the hull. to be. In addition, a marine structure having a two-tier structure has an auxiliary space formed in the drum for temporarily lowering drilling equipment such as BOP (Blow Out Preventer), which is called a recess.

However, in the conventional drill ship, there is a problem that the seamen working on the drilling equipment or deck installed on the upper part of the drain can be damaged by the seawater flow generated in the recess.

Hereinafter, referring to FIG. 1, a principle of generating a large sea water flow in the recess will be described.

1 is a partial side view of a conventional drill-in recess.

Sea waves generated by the wind are always present outside the hull 1 and seawater in the interior of the hatchery 2 receives the energy from the sea waves outside the hull 1 to generate the wave 5a.

Sea waves can be classified into deep-sea waves and deep-sea waves depending on the relationship between depth and wavelength. Sea waves in the case where the water depth is deeper than one-half of the wavelength is called deep water waves and the sea depth is shallower than one- Is called a deep sea wave.

The deep-sea waves are also called longwaves, and water particles are subjected to elliptical motion by the frictional force of the seabed since they are affected by the seabed. The propagation velocity of the shallow wave is irrelevant to the wavelength and is related only to the depth of water. Therefore, the progressive velocity of the shallow wave is slowed down as the depth becomes shallower. As the propagation speed of the deep sea wave slows down, the kinetic energy that is reduced changes to the potential energy, so that as the coastal wave approaches the coast, the wavelength becomes shorter and the wave height becomes higher.

For example, in the case of a tsunami that has a characteristic of shallow waves, if a tsunami occurs with an extremely long wavelength of 100 to 200 kilometers in the distant sea due to an earthquake, However, as the tsunami approaches the shore, the depth of the tsunami becomes shallower, slowing down the process, reducing the wavelength to several kilometers, and increasing the tsunami to tens of meters.

When the wave 5a generated in the interior space 2 has a characteristic of a deep sea wave, the depth of water in the recess 3 becomes shallow, so that the sea wave 5b in the recess 3, . The wave 5b in the recess 3 having a high crest causes a large seawater flow and the wave 5b in the recess 3 rides on the inside wall surface 2a of the interior space of the recess 3, (4) damage to crew members who are working on the hull (1).

Hereinafter, the interior wall surface 2a of the interior wall means the inner wall surface of the interior wall 2 connected to the recess 3. [

As a technique for mitigating the flow of seawater in a recess in a conventional door frame, there have been proposed a door frame resistance reducing device disclosed in Korean Patent Laid-Open No. 10-2010-0020613, Korean Patent Laid-Open No. 10-2011-0101821, Patent No. 10-2013-0075960 has a double-ended sliding door.

However, the conventional artillery resistance reduction device, the artillery resistance reduction device, and the two-stage artillery do not provide a solution to the fundamental cause of a large sea water flow, but only a structure for passively reducing the sea water flow There was a limit to preventing damage to the crew and damage to drilling equipment.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the prior art and to provide a method and apparatus for maintaining a two-stage structure of a door frame when the height of the door frame is not high, And an object of the present invention is to provide an offshore structure in which the work space of the recess moves upward and downward along the inner side wall of the door.

According to an aspect of the present invention, there is provided an offshore structure having a doorpost formed on a hull, comprising: a recess formed on the doorpost; A first recess-forming member provided under the door frame to form the recess; A second recess forming member which moves up and down along the inner side wall of the door frame; And driving means for providing a driving force to move the second recess forming member up and down.

Wherein the second recess forming member comprises: a horizontal portion horizontally formed parallel to the bottom surface of the hull so that the drilling equipment can be placed on the upper surface; And a vertical portion perpendicular to the bottom surface of the hull to move along the first recess forming member.

The marine structure may further include a guide member for guiding movement of the second recess forming member by the driving means.

Wherein the offshore structure comprises: a first conveying rail installed on an upper surface of the horizontal part to guide movement of the drilling equipment; And a second conveying rail installed on a top surface of the deck to guide movement of the drilling equipment, wherein when the upper surface of the horizontal part is at the same height as the upper surface of the deck, the first conveying rail is connected to the second conveying rail Can be connected.

The guide member may be a rail.

The driving means may be a hydraulic cylinder.

A plurality of the hydraulic cylinders may be installed in the first recess forming member.

The driving means may be a link assembly in which a plurality of link members are hinge-coupled.

The driving means may further include a hydraulic cylinder connected to one of the plurality of link members to elastically drive the link assembly.

The driving means may include a bolt member and a nut member.

The bolt member is connected to the second recess forming member, the nut member is rotatably installed in the first recess forming member, and the bolt member is moved up and down by rotating the nut member by a motor .

According to another aspect of the present invention, there is provided an offshore structure including a door frame on a hull, wherein the door structure is maintained in a double-ended structure so that a recess is formed in the door frame according to the degree of sea water flow in the door frame, The two-end structure of the door frame can be released so that the recess is not formed in the door frame.

According to another aspect of the present invention, there is provided a method of drying an offshore structure for preventing damage caused by seawater flow generated in a door frame, the method comprising: forming a first recess Installing a member; Providing driving means inside the first recess forming member; And installing a second recess forming member so as to be movable up and down by the driving means.

According to another aspect of the present invention, there is provided a method for preventing damages caused by seawater flowing in a door frame, wherein when the wave height of the wave in the door frame is high, And the second recess forming member is lowered when the wave height of the wave in the door frame is not high.

According to the marine structure of the present invention, when the sea water flow is large, the work space of the recess can be elevated to the same height as the deck, and even if the sea wave inside the marine interior has a characteristic of a deep sea wave, It is possible to prevent a phenomenon of generation of a waving wave.

Therefore, according to the present invention, it is possible to provide a space for storing and drilling the drilling equipment in the door frame, while eliminating the cause of generation of wave with high crest in the recess, It has the effect of preventing damage to the drilling equipment or the risk to the crew.

FIG. 1 is a side view schematically showing a drillhose formed with a recess in a door frame according to a conventional technique.
2 is a side view schematically showing a state where a second recess forming member included in an offshore structure according to a first preferred embodiment of the present invention is positioned below a door.
3 is a side view schematically illustrating a state in which the second recess forming member included in the offshore structure according to the first preferred embodiment of the present invention is located on the upper side of the door.
FIG. 4 is a side view schematically showing a state where a second recess forming member included in an offshore structure according to a second preferred embodiment of the present invention is located below the platform. FIG.
5 is a side view schematically illustrating a state in which a second recess forming member included in an offshore structure according to a second preferred embodiment of the present invention is positioned on the upper side of the door.
FIG. 6 is a side view schematically illustrating a state in which a second recess forming member included in a marine structure according to a third preferred embodiment of the present invention is located below the door. FIG.
FIG. 7 is a side view schematically illustrating a state in which a second recess forming member included in an offshore structure according to a third preferred embodiment of the present invention is located on the upper side of the door. FIG.
8 is a side view schematically illustrating an offshore structure according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The offshore structures of the following embodiments may be all offshore drilling offshore structures in which gate pools such as league lines, drill ships, etc. are formed. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

FIG. 2 is a side view schematically illustrating a state in which a second recess forming member included in an offshore structure according to a first preferred embodiment of the present invention is located below the door frame. FIG. 3 is a cross- FIG. 2 is a side view schematically showing a state in which a second recess forming member included in an offshore structure according to the present invention is located on the upper side of the door. FIG.

2 and 3, the offshore structure of the present embodiment comprises a platform 2 formed on the hull 1; A recess (3) formed in the interior (2) of the drum and capable of temporarily positioning the drilling rig (4); A first recess forming member 31 provided at the lower portion of the door frame 2 to form the recess 3; A second recess forming member (32) moving up and down along the interior wall surface (2a) of the interior surface of the interior wall (2a); And driving means (6) for providing a driving force to move the second recess forming member (32) up and down.

The door frame 2 is formed to penetrate the hull 1 in the vertical direction so that various drilling rigs 4 for the drilling operation at the seabed can enter and exit, and can have a rectangular parallelepiped shape or a cylindrical shape. A guiding member 7 such as a rail can be provided on the inside wall surface 2a of the interior wall of the embodiment so that the second recess forming member 32 can move along the second wall.

The recess 3 is formed in the interior of the interior 2 to provide a place where the drilling rig 4 such as a BOP can be temporarily lowered and generally the recess 3 is located below the aft- , The position where the recess 3 of the present invention is formed is not limited to the position below the aft-side sea level.

The first recess forming member 31 is provided under the door frame 2 to form the recess 3. The door frame 2 having the recess 3 is called a door pull structure of a two-stage structure. The first recess forming member 31 is provided so as to be in contact with the inside wall surface 2a of the interior of the interior of the first recess forming member 31. The first recess forming member 31 is provided with driving means 6, , A guide member 7 such as a rail can be provided so that the second recess forming member 32 can move along.

The second recess forming member 32 includes a horizontal portion 32a and a vertical portion 32b and the horizontal portion 32a is formed on the bottom surface of the hull 1 so that the drilling rig 4, And the vertical portion 32b is formed substantially perpendicular to the bottom surface of the hull 1 so as to move along the first recess forming member 31. [

One edge of the horizontal portion 32a is connected to the upper edge of the vertical portion 32b and the other edge of the horizontal portion 32a is moved upward and downward along the inner side wall surface 2a. A guide member 7 is formed on the inside wall surface 2a of the inside wall portion 2a so that the other side edge of the horizontal portion 32a can move along the guide member 7 formed on the inside wall surface 2a. The lower surface of the horizontal portion 32a is connected to the driving means 6 provided inside the first recess forming member 31. [

3 and 8, a first conveying rail 10a is provided on the upper surface of the horizontal portion 32a so that when the horizontal portion 32a rises and becomes approximately the same height as the deck 1a, The drilling rig 4 placed on the upper surface of the portion 32a can be easily moved from the horizontal portion 32a to the deck 1a and the drilling rig 4 placed on the deck 1a can be easily moved to the horizontal portion 32a can do. The second conveying rail 10b may be installed on the deck 1a so that when the horizontal portion 32a rises and becomes approximately the same height as the deck 1a, the first conveying rail 10a and the second conveying rail 10b, (10b) can be connected.

2 and 3, the upper edge of the vertical portion 32b is connected to one edge of the horizontal portion 32a, and the one surface of the vertical portion 32b contacts the first recess forming member 31 So that the vertical portion 32b can move along the first recess forming member 31 when the second recess forming member 32 moves up and down. The first recess forming member 31 may be provided with a guide member 7 and the vertical portion 32b may be moved along the guide member 7 formed in the first recess forming member 31. [

The horizontal portion 32a of the second recess forming member 32 moves along the inside wall surface 2a of the interior of the inside of the container and the vertical portion 32b of the second recess forming member 32 is moved along the inner wall surface 2a of the first recess forming member 31 ). The driving force for moving the second recess forming member 32 is provided by the driving means 6 provided inside the first recess forming member 31. [

The driving means 6 of the present embodiment is a hydraulic cylinder and is installed inside the first recess forming member 31, and a plurality of the driving means 6 can be installed. The upper end portion of the driving means 6 is connected to the lower surface of the horizontal portion 32a of the second recess forming member 32 and the second recess forming member 32 is connected to the lower surface of the horizontal portion 32a of the second recess forming member 32 by the driving force provided by the driving means 6 You can move up and down.

4 is a side view schematically illustrating a state in which a second recess forming member included in an offshore structure according to a second preferred embodiment of the present invention is positioned below the door frame, and FIG. 5 is a cross- FIG. 2 is a side view schematically showing a state in which a second recess forming member included in an offshore structure according to the present invention is located on the upper side of the door. FIG.

4 and 5, an offshore structure of the present embodiment includes a platform 2 formed on the hull 1, like the offshore structure of the first embodiment; A recess (3) formed in the interior (2) of the drum and capable of temporarily positioning the drilling rig (4); A first recess forming member 31 provided at the lower portion of the door frame 2 to form the recess 3; A second recess forming member (32) moving up and down along the interior wall surface (2a) of the interior surface of the interior wall (2a); And driving means (60) for providing a driving force to move the second recess forming member (32) up and down.

The marine structure of the present embodiment can include the guide member 7 in the inside wall surface 2a or the first recess forming member 31 like the marine structure of the first embodiment, The upper surface of the horizontal portion 32a of the second recess forming member 32 and the deck 1a may include the conveying rails 10a and 10b.

The second recess forming member 32 included in the offshore structure of the present embodiment is substantially parallel to the bottom surface of the hull 1 in the same manner as the second recess forming member 32 included in the offshore structure of the first embodiment A horizontal portion 32a formed horizontally; And a vertical portion 32b formed perpendicularly to the bottom surface of the hull 1.

However, the driving means 60 of the offshore structure of the present embodiment is a link assembly in which a plurality of link members are hinge-coupled.

One upper end portion 60a of the driving means 60 of this embodiment is connected to the lower surface of the horizontal portion 32a of the second recess forming member 32 so as to be rotatable around the hinge axis, The other upper end portion 60b of the second recess forming member 32 is connected to the lower surface of the horizontal portion 32a of the second recess forming member 32 so as to be movable in the horizontal direction and to rotate around the hinge axis. A hydraulic cylinder 8a may be provided inside the horizontal portion 32a of the second recess forming member 32. The other upper end portion 60b of the driving means 60 is connected to the hydraulic cylinder 8a, And the driving force may be provided by the cylinder 8a.

One side lower end portion 60c of the driving means 60 of this embodiment is connected to the first recess forming member 31 so as to be rotatable around the hinge axis in place and the other lower end portion 60d of the driving means 60, Is rotatably connected to the first recess forming member 31 so as to be movable in the horizontal direction and to rotate around the hinge axis. The other side lower end portion 60d of the driving means 60 is connected to the hydraulic cylinder 8b so that the driving force can be provided by the hydraulic cylinder 8b have.

6 is a side view schematically showing a state where a second recess forming member included in an offshore structure according to a third preferred embodiment of the present invention is positioned below the door frame, and FIG. 7 is a cross- FIG. 2 is a side view schematically showing a state in which a second recess forming member included in an offshore structure according to the present invention is located on the upper side of the door. FIG.

6 and 7, the offshore structure of the present embodiment is similar to the offshore structure of the first embodiment and the second embodiment, and includes a platform 2 formed on the hull 1; A recess (3) formed in the interior (2) of the drum and capable of temporarily positioning the drilling rig (4); A first recess forming member 31 provided at the lower portion of the door frame 2 to form the recess 3; A second recess forming member (32) moving up and down along the interior wall surface (2a) of the interior surface of the interior wall (2a); And driving means (600) for providing a driving force to move the second recess forming member (32) up and down.

In addition, the marine structure of this embodiment can include the guide member 7 in the inside wall surface 2a or the first recess forming member 31, like the marine structure of the first embodiment and the second embodiment As shown in Fig. 8, the upper surface of the horizontal portion 32a of the second recess forming member 32 and the deck 1a may include the transport rails 10a and 10b.

The second recess forming member 32 included in the offshore structure of the present embodiment has the same structure as the second recess forming member 32 included in the offshore structure of the first and second embodiments, A horizontal portion 32a formed substantially parallel to the surface; And a vertical portion 32b formed perpendicularly to the bottom surface of the hull 1.

However, the driving means 600 of the offshore structure of the present embodiment includes a bolt member 9a and a nut member 9b. The nut member 9b is provided so as to rotate in place without moving up and down on the inside wall surface 2a of the inside of the first recess forming member 31. The bolt member 9a is fixed to the nut member 9b and the screw So as to be movable up and down. That is, as the nut member 9b rotates, the bolt member 9a moves up and down.

The upper end of the bolt member 9a is connected to the lower surface of the horizontal portion 32a of the second recess forming member 32 so that the second recess forming member 32 is also vertically moved as the bolt member 9a moves up and down Lt; / RTI >

A motor 9d may be installed inside the hull 1 and a nut member 9b may be connected to the motor 9d through a connecting member 9c so as to be supplied with driving force from the motor 9d.

When the motor 9d rotates the connecting member 9c, the connecting member 9c is rotated by the nut member 9c so that the connecting member 9c and the nut member 9b can rotate together, And the bolt member 9a is moved up and down when the nut member 9b is rotated.

The marine structure of the present invention has a structure in which the horizontal portion 32a of the second recess forming member 32 is formed as shown in Figs. 2, 4, and 6 when the wave height of the wave 5a in the door frame 2 is not high, The two-sided structure of the door frame 2 is maintained, and the recess 3 is formed in the door frame 2.

3, 5, and 7, the horizontal portion 32a of the second recess forming member 32 is engaged with the deck 1a and the horizontal portion 32a of the second recess forming member 32. However, when the wave height of the wave 5a in the door frame 2 is high, The two-sided structure of the door frame 2 is released. Even if the wave 5a generated in the interior of the interior 2 has a characteristic of a shallow wave, the interior of the interior of the interior of the interior of the interior 2 Seawater flow may not occur.

9, the second recess forming member 32 is formed in such a manner that the upper surface of the horizontal portion 32a faces the sea level surface 32a, As shown in FIG.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is.

1: Hull 1a: Deck
2: the frame 2a: the inside frame of the frame
3: recess 31: first recess forming member
32: second recess forming member 32a: horizontal portion
32b: Vertical part 4: Drilling equipment
5a, 5b: wave 6, 60, 600: driving means
60a, 60b: upper end portions 60c, 60d: lower end portions
7: Guide member 8a, 8b: Hydraulic cylinder
9a: Bolt member 9b: Nut member
9c: connecting member 9d: motor
10a: first conveying rail 10b: second conveying rail

Claims (14)

As an offshore structure in which a door grass is formed on the hull,
A recess formed on the upper surface of the door frame;
A first recess-forming member provided under the door frame to form the recess;
A second recess forming member which moves up and down along the inner side wall of the door frame; And
And driving means for providing a driving force to move the second recess forming member up and down,
The driving means includes:
A link assembly in which a plurality of link members are hinge-coupled; And
A bolt member and a nut member; The marine structure. As an offshore structure in which a door grass is formed on the hull,
A recess formed on the upper surface of the door frame;
A first recess-forming member provided under the door frame to form the recess;
A second recess-forming member moving up and down along the inside wall surface of the interior surface of the door, and including a horizontal portion and a vertical portion;
Driving means for providing a driving force to move the second recess forming member up and down;
A first conveying rail installed on an upper surface of the horizontal part; And
And a second conveying rail installed on an upper surface of the deck,
The horizontal portion is formed horizontally in parallel with the bottom surface of the hull so that the drilling equipment can be placed on the upper surface,
The vertical portion is formed perpendicular to the bottom surface of the hull so as to move along the first recess forming member,
The first conveying rail is connected to the second conveying rail when the upper surface of the horizontal portion is flush with the upper surface of the deck,
Wherein the first conveying rail and the second conveying rail guide movement of the drilling rig. The method according to claim 1 or 2,
Further comprising a guide member for guiding movement of the second recess forming member by the driving means. The method according to claim 1,
The second recess forming member includes a horizontal portion horizontally formed in parallel with the bottom surface of the hull so that the drilling equipment can be placed on the upper surface,
A first conveying rail installed on an upper surface of the horizontal part to guide movement of the drilling equipment; And
And a second conveying rail installed on the upper surface of the deck to guide movement of the drilling equipment,
Wherein the first conveying rail is connectable with the second conveying rail when the top surface of the horizontal portion is flush with the top surface of the deck. The method of claim 3,
Wherein the guide member is a rail. delete delete delete The method according to claim 1 or 4,
When the drive means is the link assembly,
The driving means includes:
Further comprising a hydraulic cylinder connected to one of the plurality of link members to elastically drive the link assembly. delete The method according to claim 1 or 4,
When the driving means is the bolt member and the nut member,
The bolt member is connected to the second recess forming member,
Wherein the nut member is rotatably installed inside the first recess forming member,
And the bolt member is moved up and down by rotating the nut member by a motor. As a method for preventing damage due to seawater flow generated in the interior of a door,
The second recess forming member is raised to the same height as the deck when the wave height of the wave in the door frame is high,
The second recess forming member is lowered when the wave height of the wave in the door frame is not high,
The driving means of the second recess forming member includes:
A link assembly in which a plurality of link members are hinge-coupled; And
A bolt member and a nut member; / RTI > The method of claim 12,
When the second recess forming member is raised to the same height as the deck,
And a first conveying rail provided on the upper surface of the second recess forming member and a second conveying rail provided on the upper surface of the deck. delete

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