KR20160035271A - Heaving Reduction Device for Offshore Platform - Google Patents

Abstract

The present invention relates to a heaving reduction device for a semi-submersible offshore structure which is installed in a pontoon unit positioned below a surface of the sea or on the surface of the sea, installed in a lower portion of a plurality of column units. The heaving reduction device for an offshore structure comprises: a fixing member having a coupling groove formed on an outer surface in the longitudinal direction to be coupled to a side surface of the pontoon unit; and a heaving reduction plate where an insertion unit inserted into the coupling groove is provided to one end part. The heaving reduction plate is configured to be coupled to the fixing member to be fixated after the semi-submersible offshore structure reaches a target sea area in order to prevent drag caused by the heaving reduction plate during self-propulsion and reduce heave to improve operating stability when the offshore structure is moored at the target sea area.

Description

{Heaving Reduction Device for Offshore Platform}

More particularly, the present invention relates to a device for lifting and lowering a floating structure of a floating structure capable of being fixedly coupled to a fixed member after a semi-submergible floating structure arrives at a target sea area. .

As the use of various resources is rapidly increasing in accordance with industrialization, development of resources such as crude oil and natural gas is becoming a very important problem. Recently, special ships equipped with various exploration and drilling equipments such as drillships, semi-submersible drilling rigs and floating production storage and offloading units (FPSO) have been developed, And exploration and mining work for the production of various resources.

In order to drill oil and gas existing under the sea floor, a riser or a drill pipe for drilling oil or gas existing under the sea floor is fixed in a marine structure equipped with various drilling equipments And the drilling operation is carried out.

At this time, since the riser or the drill pipe is lowered thousands of meters below the sea floor, excessive movement of the marine structure due to the wave or sea condition causes damage to the riser or the drill pipe, The damage will occur.

As an example of a technique related to a device that minimizes the movement of the marine structure and enables stable operation of the marine structure under extreme wave conditions, a floating marine structure has been proposed in the following Patent Document 1, In Patent Document 2, a truss up-and-down rocking damping plate system of a marine structure has been proposed. In the following Patent Document 3, a semi-submergible marine structure has been proposed.

Korean Registered Patent No. 10-1185959 (Published on September 25, 2012) United States Patent Publication No. US 8444347 (registered on May 21, 2013) Korean Registered Patent No. 10-1358302 (Published on February 05, 2014)

Patent Document 1 proposes a floating type floating structure (cylindrical FPSO) provided with a damping member having a through-hole portion in a columnar body, but when moved by being pulled by a tug boat, .

Patent Document 2 proposes a method of lowering the upper and lower rocking damping plates of a floating structure, and Patent Document 3 proposes a method of lowering the top and bottom heave caused by an external environment such as a storm or a bird when moored on a water surface, And a semi-submergible marine structure capable of reducing propulsion resistance during the movement of the water surface.

However, Patent Documents 2 and 3 have a disadvantage in that the size of the upper and lower rocking damping plates is limited to less than the distance between the plurality of column portions, and the up-and-down rocking attenuation effect is not sufficient.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to enable the upper and lower rocking damping plates to be fixedly coupled to a stationary member after the semi-submergible floating structure arrives at a target sea area.

Another object of the present invention is to fold the upper and lower sway damping plates upward when the semi-submergible marine structure is moved to the target sea area, and to lower the upper and lower swaying damping plates to be submerged below the water surface .

According to an aspect of the present invention, there is provided an apparatus for lifting and lowering a semi-submerged floating structure provided on a pontoon portion provided below a plurality of column portions and positioned below a water surface or below a water surface, A fixing member having a coupling groove formed therein and coupled to a side surface of the pontoons; And an upper and lower rocking damping plate having an insertion portion inserted into the coupling groove at one end thereof, wherein the upper and lower rocking damping plates are fixedly coupled to the fixed member after the semi-submergible floating structure arrives at the target sea area .

Here, the coupling groove and the end face of the insertion portion may have a dove tail shape.

Here, the inner surface of the coupling groove and the outer surface of the insertion portion may be coated with an elastic body.

Here, the elastic body may be polyurethane or rubber.

In addition, the present invention provides an up-and-down sway reducing device for a semi-submerged floating structure installed in a pontoon portion provided below a plurality of column portions and positioned below a water surface or below a water surface, comprising: a support bracket installed on a side surface of the pontoons; An upper and lower damping plate provided at one end thereof with a rotation shaft rotatably coupled to the support bracket; Rotating means for rotating the upper and lower rocking plate about the rotation axis; An upper support plate protruding outward or inserted inward from a side surface of the pontoons; A lower support plate protruding outward or inserted inward from a side surface of the pontoons; And a driving unit for providing a driving force to move the upper support plate and the lower support plate to the left and right. When the upper and lower damping plates are lowered and leveled, the upper support plate has a lower surface contacting the upper surface of the upper and lower damping plate, And the lower support plate is protruded so that the upper surface of the lower support plate comes into contact with the lower surface of the upper and lower vibration damping plates.

Here, the rotating means may include: a rotating force transmitting means for transmitting a rotating force to the rotating shaft such that the up-down rocking damping plate is rotated upwards or downwards; And a rotation motor for supplying rotational force to the rotational force transmitting means.

Here, rack gears are formed on one side of the upper surface of the upper support plate in a direction perpendicular to the side surfaces of the pontoons, and rack gears are formed on one side of the lower surface of the lower support plate in a direction perpendicular to the side surfaces of the pontoons. have.

The driving unit may include a pinion gear meshed with the rack gear and protruding or inserting the upper support plate or the lower support plate from the side surface of the pontoon portion outwardly or inwardly; And a drive motor for rotating the pinion gear.

Here, the upper and lower rocking damping plates may have openings that pass through the upper and lower portions.

As described above, according to the up-and-down rocking reduction apparatus of a marine structure according to the present invention, after the semi-submergible marine structure arrives at the target sea area, the upper and lower rocking damping plates can be fixedly coupled to the stationary member, ), There is no drag due to the up-and-down rocking damping plate, and when the rock is moored in the target sea area, it is possible to reduce the vertical vibration and improve the operational stability.

In addition, when the semi-submergible floating structure is moved to the target sea area, the upper and lower sway damping plates can be folded to the upper side so that dragging due to the up-and-down damping plate does not occur. After arriving at the target sea area, It is possible to reduce the up-and-down motion and improve the operational stability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a device for lifting and lowering a floating structure according to an embodiment of the present invention;
Fig. 2 is a front view according to Fig. 1,
3 is a perspective view of the upper and lower sway reducing device of a marine structure according to another embodiment of the present invention,
FIG. 4 is a perspective view showing a state in which the upper and lower rocking damping plates are lowered and locked under the water surface in FIG. 3,
Figure 5 is a front view according to Figure 4;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the present invention is not limited to the embodiments.

Hereinafter, the configuration of the upper and lower pivotal reduction device 1 of a marine structure according to a preferred embodiment of the present invention will be described.

1 is a perspective view of an up-and-down sway reducing device of a marine structure according to an embodiment of the present invention, and Fig. 2 is a front view according to Fig.

According to an embodiment of the present invention, the upper and lower sway reducing apparatus 1 of the semi-submergible floating structure according to the present invention is characterized in that the coupling grooves 31 are formed on the outer side surface in the longitudinal direction, (30); And an up-and-down rocking attenuation plate (40) having an insertion portion (41) inserted into the coupling groove (31) at one end thereof.

The upper and lower sway reducing apparatus 1 of the semi-submerged floating structure according to the present invention is installed in the pontoons 20 provided below the plurality of columns 10 and positioned below the water surface or below the water surface.

The semi-submergible marine structure in this specification includes semi-submergible marine structures capable of propulsion such as semi-submersible drilling rig, for example, It is a concept that includes both floating production storage and offloading units (FPSO) and floating floating structures such as floating storage and regasification units (or FSRU).

1, the semi-submergible marine structure includes a working deck, a plurality of column portions 10 extending in a downward direction of the working deck, and a plurality of column portions 10 provided below the plurality of column portions 10, And a pontoon part 20 positioned below the water surface.

The operation deck is installed on the plurality of column portions 10 so that the plurality of column portions 10 are connected to each other. Depending on the use of the semi-submergible floating structure, various types of drilling pipes, mud modules, It provides a space where equipment and facilities can be loaded. In addition, work decks may be equipped with helicopter landing sites or residential facilities where crew members may reside.

The column portion 10 may have a polygonal columnar or cylindrical shape. The polygonal column in the present specification is a concept including all columnar shapes having a cross-sectional shape surrounded by a plurality of line segments on one plane such as a triangle, a square, and a pentagon.

The pontoon portion 20 of the semi-submergible marine structure is submerged in water and the plurality of column portions 10 protrude above the water surface to support the upper structure, And the operation area of the external force is reduced, thereby greatly improving the work performance of the structure in the wave.

The pontoon part 20 functions to balance the pontoon submerged marine structure so as to maintain its posture in the sea according to the load distribution of each situation when the semi-submergible marine structure is moored on the sea, And a ballast tank for reducing fluctuation of the hull.

In the present embodiment, the pontoons 20 may be disposed one on each side of the working deck, and on each of the pontoons 20, a plurality of column portions 10 arranged in a rectangle, A pair of column portions 10 may be provided. That is, the number of column portions 10 corresponding to half of the plurality of column portions 10 may be provided on each of the pontoons 20. For example, when a total of four column portions 10 are disposed, two column portions 10 may be provided on one pontoon portion 20. [

The fixing member 30 is coupled to the upper and lower damping plate 40 to fix the upper and lower damping plate 40. The fixing member 30 is coupled to the side surface of the pontoon unit 20, A coupling groove 31 is formed in the side surface on the opposite side of the surface to be welded.

It is preferable that the fixing member 30 is welded to the side surface of the pontoon portion 20 so as to be fixed thereto and the vertical length of the surface coupled to the side surface of the pontoon portion 20, Is longer than the vertical length of the surface on which the grooves 31 are formed, and thus has a trapezoidal cross section as a whole.

The coupling groove 31 is a portion to which the insertion portion 41 of the upper and lower rocking damping plate 40 is inserted and joined in the longitudinal direction.

The upper and lower rocking damping plates 40 function to maintain the posture of the semi-submergible floating structure moored or moored on the water surface and to reduce the top and bottom motion by being coupled with the fixing member 30, An insertion portion 41 is provided in the groove 31 in the longitudinal direction.

According to the present embodiment, when the semi-submergible floating structure is moved up and down, a vortex is generated at the corner portion of the up-and-down rocking plate 40 extending to the outside of the pontoon portion 20, The motion can be reduced.

2, the cross-section of the coupling groove 31 and the insertion portion 41 may be formed in a dove tail shape.

Therefore, if the insertion portion 41 of the upper and lower damping plate 40 is inserted into the coupling groove 31 of the fixing member 30 in the longitudinal direction, even if a force is applied to the upper and lower damping plate 40 by the wave The upper and lower rocking damping plates 40 are not separated from the fixing member 30 in the direction perpendicular to the longitudinal direction.

The inner surface of the engaging groove 31 and the outer surface of the inserting portion 41 may be coated with an elastic body so as to minimize damage due to an external force. Examples of such an elastic body include synthetic resins such as polyurethane, natural rubber, Various known materials can be used.

In this embodiment, the upper and lower rocking damping plates 40 are fixedly coupled to the fixing member 30 after the semi-submergible floating structure arrives at the target sea area.

That is, after the semi-submergible marine structure arrives at the target sea area, the upper and lower rocking damping plates 40 are inserted into the fixing member 30 in the longitudinal direction by a tug boat, a crane or the like.

In this way, the semi-submerged floating structure moves to the target sea area in a state where the upper and lower sway damping plates 40 are separated from the fixing member 30. In the self-propulsion, the upper and lower sway damping plates 40, The upper and lower rocking damping plates 40 are coupled to the stationary member 30 to be locked under the water surface when the rock is moored in the target sea area. As a result, it is possible to reduce the heave and improve the stability of the operation There is an advantage that can be made.

The upper and lower sway damping plates 40 may be formed with openings 48 passing through the upper and lower sides.

Therefore, when the semi-submergible floating structure moves upward and downward, seawater flows in and out through the plurality of openings 48 formed in the upper and lower rocking damping plates 40, causing additional vortexes to move up and down the upper and lower rocking damping plates 40 It is possible to increase the abatement effect, thereby further reducing the up-and-down movement of the semi-submergible floating structure

The upper and lower sway reducing device 1 of the semi-submergible floating structure according to the present invention may further include fastening means (not shown) for fastening the fastening member 30 and the upper and lower rocking damping plates 40.

The fastening means prevents the longitudinal movement of the upper and lower damping plate 40 in the state where the upper and lower damping plate 40 is coupled to the fixing member 30 so that the upper and lower damping plate 40 moves from the fixing member 30 For example, a bolt, a nut, or the like that passes through the fixing member 30 and the upper and lower damping plate 40 and is coupled to each other.

That is, after the upper and lower damping reducing plates 40 are inserted into the fixing member 30 in the longitudinal direction, bolts and nuts are fastened through the fixing member 30 and the upper and lower damping plates 40, 40 are prevented from being separated from the fixing member 30 in the longitudinal direction.

Hereinafter, the configuration of the upper and lower pivotal reduction device 1 of a marine structure according to another embodiment of the present invention will be described.

FIG. 3 is a perspective view of an up-and-down rocking reduction device of a marine structure according to another embodiment of the present invention, FIG. 4 is a perspective view showing a state in which the upper and lower rocking- Fig.

According to the present embodiment, the upper and lower sway reducing apparatus 1 of the semi-submerged floating structure according to the present invention comprises a support bracket 25; An upper and lower sway damping plate 40; Rotating means (50); An upper support plate (60); A lower support plate 70; And a driving unit 80.

The support bracket 25 serves to support the upper and lower damping plate 40 by rotatably coupling a rotary shaft 45 provided at one end of the upper and lower damping plate 40, As shown in FIG.

A rotary shaft 45 is provided at one end of the upper and lower damping plate 40 and a rotating means 50 for rotating the upper and lower damping plate 40 about the rotary shaft 45 is provided .

According to the present embodiment, the rotating means 50 includes a rotating force transmitting means 51 and a rotating motor 52 (see Fig. 5).

The rotational force transmitting means 51 has a function of transmitting the rotational force supplied from the rotational motor 52 to the rotary shaft 45 to rotate the upper and lower rocking damping plates 40 upwards or downwards and includes a general gear or a worm gear Or may comprise a chain and a sprocket.

In addition, a locking device (not shown) may be provided on the side of the working deck.

This locking device functions to prevent the upper and lower rocking plate 40 from being unintentionally rotated downward by fixing the upper end of the rocking plate 40 to the side surface of the working deck.

The upper support plate 60 has a function of preventing the upper and lower vibration damping plates 40 from being rotated upward by protruding outward from the side surface of the pontoon portion 20 when the upper and lower vibration damping plates 40 are lowered and leveled The upper and lower rocking damping plates 40 are inserted into the pontoon portion 20 so as to be rotated upward and folded.

The lower support plate 70 has a function of preventing the upper and lower vibration damping plates 40 from being downwardly protruded outward from the side surface of the pontoon portion 20 when the upper and lower vibration damping plates 40 are lowered and leveled And is inserted into the pontoon portion 20 so that the drag force can be minimized at the moment of semi-submergible floating structure.

That is, when the upper and lower rocking damping plates 40 are lowered and leveled, the upper support plate 60 protrudes to be in contact with the upper surface of the upper and lower rocking damping plates 40, and the lower support plate 70 protrudes, The lower surface of the upper and lower damping plate 40 is brought into contact with the lower surface of the upper and lower damping plate 40.

The outer surface of the lower surface of the upper support plate 60 and the upper surface of the lower support plate 70 and the portion of the upper and lower shake damping plates 40 that are in contact with the upper support plate 60 and the lower support plate 70, And various known materials such as synthetic resins such as polyurethane and natural rubber or synthetic rubber may be used as the elastic body.

The driving force for moving the upper support plate 60 and the lower support plate 70 left and right is set so that the upper support plate 60 and the lower support plate 70 protrude outward or inward from the side surface of the pontoon portion 20 A driving unit 80 is provided.

To this end, a rack gear 61 is formed on one side of the upper surface of the upper support plate 60 in a direction perpendicular to the side surface of the pontoons 20, and on the lower surface of the lower support plate 70, The rack gear 71 is formed in the vertical direction.

The driving unit 80 includes a pinion gear 81; And a drive motor 82.

The pinion gear 81 is meshed with the rack gears 61 and 71 so that the upper support plate 60 or the lower support plate 70 is protruded outward from the side surface of the pontoon portion 20, And is coupled to rotate integrally with the rotation shaft of the drive motor 82.

With this configuration, when the semi-submergible floating structure is moved to the target sea area, the upper and lower swaying damping plates (40) can be moved to the target sea area with the upper and lower sway reducing plates The upper and lower rocking damping plates 40 may be lowered to actuate the driving unit 80 so that the upper and lower support plates 60 and 70 protrude to lock the upper and lower rocking plate 40 below the water surface.

Therefore, when the semi-submergible marine structure is moved to the target sea area, the upper and lower swaying damping plates 40 are moved upward to the target sea area, After arriving at the target sea area, the upper and lower damping plates (40) are lowered to be submerged below the water surface, thereby reducing the up-and-down movement and increasing the stability of the operation.

The up-and-down rocking reduction device of a marine structure according to the present invention allows the up-and-down rocking damping plate to be fixedly coupled to a stationary member after the semi-submergible floating structure arrives at the target sea area, There is no drag caused by the plate, and when moored in the target area, there is an advantage that the heave can be reduced and the operational stability can be improved.

In addition, when the semi-submergible floating structure is moved to the target sea area, the upper and lower sway damping plates can be folded to the upper side so that dragging due to the up-and-down damping plate does not occur. After arriving at the target sea area, It is possible to reduce the up-and-down movement and increase the stability of the operation.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, such modifications or changes should be construed as being included within the scope of the present invention.

1: Upper and lower shake reduction device of marine structure
10: Column part
20: pontoon part 25: support bracket
30: fixing member 31: engaging groove
40: upper and lower rocking plate 41:
45: rotating shaft 48: opening
50: rotating means
51: Torque transmitting means 52:
60: upper support plate 61: rack gear
70: lower support plate 71: rack gear
80:
81: Pinion gear 82: Drive motor 82:

Claims (10)

An up-and-down sway reducing device for a semi-submerged floating structure installed at a pontoon portion (20) provided below a plurality of column portions (10) and located below a water surface or below a water surface,
A fixing member 30 having an engaging groove 31 formed on its outer surface in the longitudinal direction and coupled to a side surface of the pontoon portion 20; And
And an upper and lower rocking damping plate (40) having an insertion portion (41) inserted into the coupling groove (31) at one end thereof,
Wherein the upper and lower rocking damping plates (40) are fixedly coupled to the fixing member (30) after the semi-submergible floating structure arrives at a target sea area.
The method according to claim 1,
Wherein the coupling groove (31) and the insertion portion (41) have a dove tail shape.
3. The method according to claim 1 or 2,
Further comprising fastening means for preventing longitudinal movement of the upper and lower rocking plate (40) in a state where the upper and lower rocking plate (40) is coupled to the stationary member (30) Of the upper and lower shake reduction device.
The method of claim 3,
Wherein an inner surface of the coupling groove (31) and an outer surface of the insertion portion (41) are coated with an elastic body.
5. The method of claim 4,
Wherein the elastic body is polyurethane or rubber.
An up-and-down sway reducing device for a semi-submerged floating structure installed at a pontoon portion (20) provided below a plurality of column portions (10) and located below a water surface or below a water surface,
A support bracket 25 installed on a side surface of the pontoon 20;
(40) having a rotary shaft (45) rotatably coupled to the support bracket (25) at one end thereof;
Rotating means (50) for rotating the upper and lower rocking plate (40) about the rotating shaft (45);
An upper support plate 60 protruding outward or inserted inward from the side surface of the pontoons 20;
A lower support plate 70 protruding outward from the side surface of the pontoon 20 or inserted inward; And
And a driving unit (80) for providing driving force for moving the upper support plate (60) and the lower support plate (70) to the left and right,
The upper support plate 60 is protruded such that the lower surface of the upper support plate 60 contacts the upper surface of the upper and lower damping plate 40, (40) is in contact with the lower surface of the upper and lower damping plate (40).
The method according to claim 6,
The rotating means (50)
Rotating force transmitting means (51) for transmitting a rotating force to the rotary shaft (45) so that the upper and lower rocking damping plates (40) are rotated upward or downward; And
And a rotating motor (52) for supplying a rotating force to the rotating force transmitting means (51).
8. The method of claim 7,
A rack gear 61 is formed on one side of the upper surface of the upper support plate 60 in a direction perpendicular to the side surface of the pontoon 20,
Wherein a rack gear (71) is formed on one side of a lower surface of the lower support plate (70) in a direction perpendicular to a side surface of the pontoon part (20).
9. The method of claim 8,
The driving unit (80)
The pinion gears 61 and 71 are engaged with the rack gears 61 and 71 to project the upper support plate 60 or the lower support plate 70 outwardly from the side surfaces of the pontoons 20, 81); And
And a drive motor (82) for rotating the pinion gear (81).
10. The method according to claim 5 or 9,
Wherein the upper and lower rocking damping plates (40) are provided with openings (48) passing through the upper and lower portions.

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