KR20130034074A - Floating production storage and offloading - Google Patents

Abstract

PURPOSE: A floating offshore structure is provided to effectively compensate for one of longitudinal and transverse motions due to the movement of a hull without highly increasing expenses. CONSTITUTION: A floating offshore structure(1) comprises a girder(100), a stool(200), and a motion compensating connection part(300). The girder forms the lower part of a truss structure(TC) arranged in the upper part of a hull(H). The stool is arranged under the girder to support the truss structure. The motion compensating connection part allows relative movements between the girder and the stool to compensate for one of longitudinal and transverse motions. The motion compensating connection part comprises one or more plate parts(310) and a connection member(350). The plate parts are extended from the girder and the stool in parallel. The connection member connects the plate parts.

Description

Floating offshore structures {FLOATING PRODUCTION STORAGE AND OFFLOADING}

The present invention relates to a floating offshore structure, and more particularly, during longitudinal movement of the hull, during longitudinal movement along the imaginary line connecting the bow and stern of the hull and in the longitudinal transverse direction. It relates to a floating offshore structure in which either directional motion is compensated.

Floating offshore structures such as LNG FPSO (Floating Production Storage and Offloading) produce natural gas by drilling the seabed while floating in the sea where the flow occurs, and by processing and liquefying the produced natural gas directly on the sea LNG storage tank Perform the operation inside the store.

In order to perform these operations, various facilities are required for the production, processing and liquefaction of natural gas, which are placed on the deck top of the floating offshore hull as having a heavy load.

The deck upper module, which is arranged on the deck top of the floating offshore hull, is usually manufactured in a modular form and installed in a plurality of stools provided on the hull.

A plurality of stools can flow in different directions due to the hull behavior caused by wind, waves, or tides. In view of this, the upper deck module and each stool can be flowed to some extent, but the load is supported. It is common to connect by a special bearing.

1 is a schematic representation of the optimized movements required in the design of a support for supporting a deck upper module in order to minimize the effects of stress fluctuations and displacements of the deck upper module due to hull motion. The large arrows here indicate the direction of travel of the ship.

In general, the movement of the vessel in sailing is surging (surging) about the horizontal axis in the longitudinal direction of the hull (H), rolling (rolling) about the horizontal axis in the longitudinal direction of the hull (H), hull (H) Swaying (swinging) moving along the horizontal horizontal axis of the ship, pitching of the hull (H) about the horizontal horizontal axis (pitching), vertical swing of the hull (H) in the vertical axis direction (heaving) And six-way motions such as yawing in the vertical axis direction of the hull H. FIG.

In order to minimize the influence of the stress fluctuation and displacement of the deck upper module F due to the movement of the ship, the four-direction support for supporting the deck upper module F, as shown in FIG. Is designed.

Specifically, the area A of FIG. 1 is designed to correspond to the longitudinal direction of the ship (hereinafter referred to as the “longitudinal direction” refers to a direction formed along an imaginary line connecting the bow and the stern of the hull), and the area B is a ship. It is designed to be constrained to the hull (H) so that there is no behavior in the longitudinal and transverse directions (hereinafter referred to as "lateral direction" in the longitudinal direction).

In addition, the region C of FIG. 1 is designed to correspond to the lateral movement of the hull H, and the region D is designed to correspond to the longitudinal and lateral movement of the hull H. FIG.

This design frees the deck upper module from displacement due to the behavior of the hull H and minimizes the stress variation caused by moment transfer between the hull H and the deck upper module F. FIG.

FIG. 2 is a view schematically illustrating a state in which a deck upper module is connected to a stool by a special device in region A of FIG. 1 according to an exemplary embodiment.

A special arrangement for connecting the deck upper module F and the stool 20 of the conventional medium and large floating offshore structures used in the area A of FIG. 1 described above, as shown in FIG. Bearing pads E are provided to allow longitudinal movement in the contact area of the module with the stool 20. Prior art related to such floating offshore structures is disclosed in Korean Patent Publication No. 10-1984-0007690 (December 20, 1984).

Elastomeric bearings are mainly used as bearing pads (E) of special devices. The elastomeric bearing is manufactured by alternately laminating an elastic body (elastomer) having a thickness of 0.7 to 2 mm and a metal shim of the same thickness alternately. As shown in FIG. 2, the deck upper module F It is disposed between the lower region of the stool and the stool 20.

Specifically, a first elastomer E1 (elastomer) is disposed between the girder 10 and the upper space of the stool 20, which form a lower portion of the deck upper module F, and the girder 10 and the stool 20. The second elastomer E2 is disposed between both side spaces of the second elastomer.

Such elastomeric bearings are made of reinforced rubber and are difficult to manufacture, and are composed of a first elastomer E1 and a second elastomer E2 and installed in the space between the girder 10 and the stool 20, respectively. Therefore, the set positions of the first elastomer E1 and the second elastomer E2 may be changed in the installation process.

In particular, in the case of the second elastomer E2, unlike the first elastomer E1, the second elastomer E2 is disposed between the lateral spaces of the girder 10 and the stool 20, so that the deck upper module F is installed at the sea floor. When transported to the installation site may be separated from the space by the behavior of the hull (H) there is a disadvantage that requires a separate gourd member (not shown) to prevent this.

In addition, the first elastomer (E1) serves to transfer the vertical load generated from the deck upper module to the hull (H), because the first elastomer (E1) is made of an elastic body due to the effect of the accumulated load The elastic modulus fluctuates, resulting in the initial calculated value and the error, making it difficult to calculate the exact vertical load transfer force.

Furthermore, since the elastomeric bearing is purchased from an overseas company, the purchase cost is increased, and according to one conventional embodiment, when the up-lift of the hull H occurs, the deck upper module F is removed from the hull H. In order to prevent the departure, as shown in Figure 2, because a separate restraint device 30 is required, there is a disadvantage that additional costs are required.

These problems occur in the same or similar manner when the deck upper module is connected to the stool by a special device in the area C of FIG.

Therefore, there is a need for the development of a new and advanced type of floating offshore structure that can satisfy the cost while efficiently compensating either the longitudinal motion or the lateral motion of the hull.

Korean Patent Publication No. 10-1984-0007690 (Albert Norman) 1984. 12. 20

Therefore, the technical problem to be achieved by the present invention, while using the cost-effective elastomeric bearing, which is the biggest problem of the conventional floating offshore structure, the one of the longitudinal motion and the lateral motion by the behavior of the hull efficiently It is to provide a floating offshore structure that can solve the uncompensated problem.

According to one aspect of the invention, a girder (girder) to form a lower portion of the truss structure disposed in the upper region of the hull; A stool disposed in the lower region of the girder to support the truss structure; And a virtual line connected to the girder and the stool, allowing a relative movement between the girder and the stool within a preset range to connect the stern with the bow of the hull on the girder side by oscillation of the stool side. Floating offshore structure may be provided that includes a connection for compensating for the movement of any one of the longitudinal movement is formed and the transverse movement in the horizontal direction of the longitudinal direction.

The exercise compensating connection part may include at least one plate part extending from the girder and the stool, respectively, and having exposed ends partially parallel to each other; And it may include a connecting member for connecting portions arranged in parallel with each other of the one or more plate.

The plate portion, one side is coupled to the lower side of the girder and the other side is provided with one or more first plates disposed adjacent to the upper side of the stool; And a second plate portion having one or more second plates coupled to an upper side of the stool and the other portion disposed adjacent to the lower side of the girder and disposed in parallel with the one or more first plates. .

The at least one first plate and the at least one second plate may be arranged side by side and alternately arranged with each other, and the at least one first plate and the at least one second plate may be arranged side by side without welding. Can be.

The at least one first plate and the at least one second plate in a region where the at least one first plate and the at least one second plate face each other may have a rounded shape.

A round hole is formed in one of the one or more first plates and the one or more second plates, and the other of the one or more first plates and the one or more second plates has a long hole at a position corresponding to the round hole. The one or more first plates and the one or more second plates may be interconnected by the connecting member.

The connecting member may be a pin that connects the circular hole and the long hole to allow the girder to move in one of the longitudinal direction and the transverse direction with respect to the stool when the hull swings.

The movement compensation connection portion compensates for the longitudinal movement, and the long hole may be formed along an imaginary line connecting the stern with the bow of the hull.

The movement compensation connection portion compensates for the lateral movement, and the long hole may be formed in a horizontal direction of a virtual line connecting the stern with the bow of the hull.

The reinforcement plate may further include a reinforcing plate to be fixed to the lower portion of the truss structure.

Embodiments of the present invention can efficiently compensate for the lateral motion of the longitudinal motion and the lateral motion due to the hull behavior while using the expensive elastomeric bearing which is the biggest problem of the conventional floating marine structure. By solving this problem, it is possible to provide a floating offshore structure having an efficient structure capable of compensating either the longitudinal motion or the lateral motion due to the hull behavior without increasing the cost.

1 is a view schematically showing the optimized movement required in the design of the support for supporting the deck upper module in order to minimize the influence of stress variation and displacement of the deck upper module due to the hull motion (Hull Motion).
FIG. 2 is a view schematically illustrating a floating marine structure according to an exemplary embodiment in which a deck upper module is connected to a stool by a special device in region A of FIG. 1.
3 is a schematic diagram illustrating a motion compensating connection for compensating for a state in which a floating marine structure is mounted on a hull and a longitudinal motion and a lateral movement of the floating marine structure according to an embodiment of the present invention; One drawing.
4 is a cross-sectional view taken along line IV-IV of FIG. 3.
FIG. 5 is a view schematically illustrating a state in which a circular hole is formed in the first plate and a long hole is formed in the second plate in the connection for motion compensation shown in FIG. 4.
6 is a view schematically showing a state of use of the floating offshore structure shown in FIG.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in order to avoid unnecessary obscuration of the present invention.

Floating offshore structure to which an embodiment of the present invention is applied is a floating production storage and unloading facility (FPSO), liquefied natural gas production and storage facility (LNG FPSO) or floating LNG storage regasification mainly dealing with oil (Oil) This includes both offshore structures such as LNG FSRUs as well as vessels such as LNG carriers or LNG Regasification Vessels (RVs).

3 is a schematic diagram illustrating a motion compensating connection for compensating for a state in which a floating marine structure is mounted on a hull and a longitudinal motion and a lateral movement of the floating marine structure according to an embodiment of the present invention; 4 is a cross-sectional view taken along line IV-IV of FIG. 3, and FIG. 5 is a state in which a circular hole is formed in the first plate and a long hole is formed in the second plate in the connection for motion compensation shown in FIG. 4. It is a schematic drawing. The large arrows shown in these figures indicate the direction of travel of the ship.

As shown in these drawings, the floating offshore structure 1 according to the present embodiment is arranged in the upper region of the hull H, the girder 100 and the lower region of the girder 100. It is connected to the stool 200, the stool, the girder 100 and the stool 200, and compensates for any one of the longitudinal motion and the lateral motion of the girder 100 side by the shaking of the stool 200 side. The exercise compensation connection unit 300 is provided. The term "longitudinal" refers to the direction formed along the imaginary line connecting the hull and the stern, and the term "lateral" refers to the longitudinal direction.

As shown in FIG. 3, the girder 100 forms a lower portion of the truss structure TC disposed in the upper region of the hull H, and the truss structure TC is placed on the upper portion of the hull H so as to be upper part. It forms a deck, which is provided in the form of a truss or lattice having a high bearing capacity against its own weight. In addition, the truss structure TC may be formed by connecting the plurality of truss structures TC in the vertical direction or the horizontal direction according to the required height and width.

As shown in FIG. 3, the stool 200 is disposed in the lower region of the girder 100, that is, installed in the hull H, and is connected to the girder 100 by the connection part 300 for motion compensation so that the truss structure ( TC) and serves to transmit the vertical load generated in the truss structure (TC) to the hull (H).

As shown in FIGS. 3 and 4, the exercise compensation connection part 300 is connected to the girder 100 and the stool 200, but performs relative movement between the girder 100 and the stool 200 within a preset range. Allow it to serve to compensate for any one of the longitudinal motion and the lateral motion of the girder 100 side by the swing of the stool 200 side. For convenience of description, in the present embodiment, the exercise compensating connector 300 performs the role of compensating for the longitudinal motion, but the scope of the present invention is not limited thereto. Proper installation of the valve may serve to compensate for lateral motion.

As described above, when the exercise compensating connector 300 compensates for the longitudinal motion in the present embodiment, the longitudinal motion of the girder 100 is preliminary by the motion compensating connector 300 when the hull H swings. Since it is possible within the set range, the shear force generated due to the longitudinal bending moment of the hull H is significantly reduced by the longitudinal rolling movement on the girder 100 side.

In addition, in the present embodiment, since the lateral movement of the girder 100 and the stool 200 is constrained by the connection part 300 for the motion compensation, the girder 100 side when the up-lift of the hull H is lifted. In order to prevent deviation from the hull H, there is an advantage of not requiring a separate restraint device 30 (see FIG. 2) as in the embodiment of the prior art.

Furthermore, the present embodiment can replace the elastomeric bearing (see FIG. 2) according to an embodiment of the prior art by the connection part 300 for motion compensation, thereby reducing the cost of using an expensive elastomeric bearing. There is an advantage.

In addition, the present embodiment is a vertical value of the correct value due to the first calculated value and the error due to the variation of the elastic modulus, which is a problem caused in one embodiment of the prior art by the motion compensation connection part 300 made of a rigid body, not an elastic body This can solve the problem of difficult calculation of load transfer force.

Now, the motion compensation connection part 300 will be described in detail. As shown in FIGS. 3 and 4, the exercise compensation connection part 300 extends from the girder 100 and the stool 200, respectively, so that an exposed end thereof is formed. At least one plate part 310 disposed in parallel with each other, and the connecting member 350 for interconnecting the at least one plate portion 310 arranged side by side.

One or more plate portions 310 of the motion compensation connection portion 300 are connected to each other by a connection member 350 to be described later, so that the vertical load generated from the girder 100 side is transmitted to the stool 200 side. 4, a first plate part 320 having one or more first plates 321 disposed at an upper side thereof and coupled to a lower side of the girder 100 and disposed at a lower side thereof adjacent to an upper side of the stool 200. And, the lower portion is coupled to the upper side of the stool 200 and the upper portion is positioned adjacent to the lower side of the girder 100 and arranged in parallel with one or more first plate 321, but with one or more first plate 321 The second plate portion 330 is provided with one or more second plates 331 alternately disposed.

In the present embodiment, one or more first plates 321 and one or more second plates 331 are arranged in parallel with each other, and are arranged alternately, one or more first plates 321 and one or more second plates 331. The mutually facing regions of are mutually welded and arranged side by side, in order to allow longitudinal (L, see FIG. 6) movement of the girder 100 side during the behavior of the hull H.

In addition, since one or more first plates 321 and one or more second plates 331 are welded to each other and disposed alternately with each other, one or more of the first plates 321 and one or more second plates 331 There is an advantage in that the work is simplified since there is no need for a joining operation such as a separate welding work in the areas arranged side by side.

Meanwhile, as shown in FIG. 3, the first plate 321 and the second plate 331 in a region where the first plate 321 and the second plate 331 face each other have a rounded shape. This is because the rounded shape is a shape that can have optimized rigidity while reducing manufacturing costs of the first plate 321 and the second plate 331.

That is, at least one first plate 321 coupled to the lower side of the girder 100 during the behavior of the hull H is connected to the at least one second plate 331 by the connection member 350, thereby at least one first plate. The 321 and the at least one second plate 331 are mutually concentrated in an area facing each other and disposed in parallel to each other, since the shape that can withstand the concentrated load and is satisfied in terms of cost is a rounded shape.

In the present embodiment, one or more first plates 321 and one or more second plates 331 are disposed in parallel with each other and in one region of the one or more first plates 321 facing each other, as shown in FIG. 5. The circular holes 321a may be formed respectively, and the one or more second plates 331 may have the long holes 331a formed at positions corresponding to the circular holes 321a, respectively.

Here, the long hole 331a formed in the second plate 331 may be elongated in the longitudinal direction L, as shown in FIG. 5.

Thus, in this embodiment, since the circular hole 321a is formed in the first plate 321 and the long hole 331a is formed in the second plate 331 in the longitudinal direction, thereby the girder when the hull H behaves. The longitudinal direction (L, see FIG. 6) movement of the (100) side is enabled by the long hole 331a formed in the longitudinal direction, but the lateral direction (T, see FIG. 6) movement of the girder 100 side is 2nd. Since the plate 331 is welded and fixed to the stool 200, it is constrained, and consequently only the longitudinal L movement on the side of the girder 100 is allowed. In this embodiment, although the circular hole 321a is formed in the first plate 321 and the long hole 331a is formed in the second plate 331 in the longitudinal direction, the scope of the present invention is not limited thereto. A circular hole (not shown) may be formed in the plate 331, and a long hole (not shown) may be formed in the first plate 321 in the longitudinal direction.

Meanwhile, in the present embodiment, one or more first plates 321 may have an upper end thereof coupled to the lower side of the girder 100 by welding, and the one or more second plates 331 may have a lower end of the stool 200. Can be joined in the manner of a welded joint to the top of it.

As shown in FIG. 3, the connection member 350 of the exercise compensation connection part 300 may include a first plate part 320 coupled to the lower side of the girder 100 and an upper part of the stool 200. The two plate portions 330 are connected to each other to allow the truss structure TC to move in the longitudinal direction L with respect to the stool 200 when the hull H swings.

In the present embodiment, the connecting member 350 has a circular hole formed in the first plate 321 to allow the truss structure TC to move in the longitudinal direction L with respect to the stool 200 when the hull H swings. It may be a pin that connects through the long hole 331a formed in the 321a and the second plate 331.

In this embodiment, when the connecting member 350 is a pin, the first plate 321 and the second plate 331 are parallel to each other due to the rolling movement of the pin when displacement occurs due to the longitudinal bending moment of the hull H. The frictional force in the areas facing each other is reduced, and as a result, the generation of shear force in the area is significantly reduced.

In the present embodiment, when the connecting member 350 is the pin 350, in order to prevent separation of the pin 350 connecting the first plate 321 and the second plate 331, the connection member 350 is connected in the present embodiment. A fixing member (not shown) may be further included to prevent separation of the pin 350, which is the member 350. For example, a male thread may be machined at both ends of the connecting member 350, and a hollow member having a female thread formed at the inner wall at both ends thereof may be screwed so that the hollow member functions as a fixing member, or Through-holes (not shown) may be installed in the longitudinal direction of the connecting member 350 in both ends, and a stopper (not shown) may be inserted into the through-holes to function as a fixing member.

Meanwhile, in the present embodiment, as shown in FIGS. 3 to 5, the lower part of the girder 100 and the upper part of the stool 200 are fixed to the lower part of the truss structure TC. It further includes a plurality of reinforcing plates 400 are respectively coupled to the side to reinforce the connection portion 300 for the motion compensation.

6 is a view schematically showing a state of use of the floating offshore structure shown in FIG. Hereinafter, a state of use of the floating offshore structure according to the present embodiment will be briefly described with reference to FIG. 6.

First, the present embodiment is to compensate for longitudinal movement (region A of FIG. 1) of the truss structure TC during the behavior of the hull H. As shown in FIG. 6, when the hull H behaves, The stool 200 coupled to H moves together with the hull H, and the movement of the hull H is offset by the motion compensation connection part 300 and transmitted to the truss structure TC.

That is, in the present embodiment, the movement of the hull H is not transmitted as it is to the truss structure TC by the connection part 300 for the motion compensation, but is canceled by the longitudinal L cloud movement of the truss structure TC so that the truss Delivered to the structure TC.

As a result, the truss structure TC is freed from the displacement due to the behavior of the hull H, and the stress variation caused by the moment transfer between the hull H and the truss structure TC is minimized.

Therefore, this embodiment can exhibit better performance without using expensive elastomeric bearings, unlike the embodiment of the prior art, and the girder 100 and the stool 200 by the motion compensation connection 300 Since the transverse direction (T) movement is constrained, the truss structure TC is prevented from being separated from the hull H during up-lift of the hull H, as in an embodiment of the prior art. Since there is no need for a restraining device (see FIG. 2), there is an efficient advantage in terms of manufacturing cost.

In the above-described embodiment, the long hole is formed along an imaginary line connecting the stern with the bow of the hull, and the connection for the motion compensation is longitudinal movement of the truss structure TC during the movement of the hull H (region A in FIG. 1). Although the above is described in the above, the long hole is formed in the transverse direction of the imaginary line connecting the stern with the bow of the hull, and the motion compensation connection part is properly installed in a position capable of compensating the lateral movement. The behavior of the hull H may compensate for the lateral movement of the truss structure TC (region C in FIG. 1).

As described above, the present invention is not limited to the described embodiments, and various modifications and changes can be made without departing from the spirit and scope of the present invention, which will be apparent to those skilled in the art. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

1: Floating offshore structure 100: Girder
200: Stool 300: connection for motion compensation
310: plate portion 320: first plate portion
321: first plate 321a: circular hole
330: second plate portion 331: second plate
331a: long hole 350: connecting member
400: reinforcement plate E: bearing pad
E1: first elastomer E2: second elastomer
H: Hull L: Longitudinal direction
T: Transverse TC: Truss Structure

Claims (10)

A girder forming a lower portion of the truss structure disposed in the upper region of the hull;
A stool disposed in the lower region of the girder to support the truss structure; And
It is connected to the girder and the stool, but allows a relative movement between the girder and the stool within a predetermined range to form a imaginary line connecting the bow of the hull and the stern of the hull by the swing of the stool side Floating offshore structure comprising a connection for compensating for the movement of any one of the longitudinal movement and the transverse transverse direction of the longitudinal direction. The method of claim 1,
The exercise compensation connection portion,
At least one plate portion extending from the side of the girder and the stool, the exposed ends being partially parallel to each other; And
Floating offshore structure including a connection member for connecting the portions arranged in parallel with each other of the one or more plate. The method of claim 2,
The plate portion,
A first plate part having one or more first plates coupled to a lower side of the girder and the other part disposed adjacent to an upper side of the stool; And
Floating maritime comprising a second plate portion having at least one second plate is coupled to the upper side of the stool and the other side is located adjacent to the lower side of the girder and arranged in parallel with the at least one first plate structure. The method of claim 3,
The one or more first plates and the one or more second plates are arranged side by side and alternately arranged, and the one or more first plates and the one or more second plates are welded to each other and arranged side by side Floating offshore structure, characterized in that. The method of claim 3,
And the at least one first plate and the at least one second plate in a region where the at least one first plate and the at least one second plate face each other have a rounded shape. The method of claim 3,
A round hole is formed in one of the one or more first plates and the one or more second plates, and the other of the one or more first plates and the one or more second plates has a long hole at a position corresponding to the round hole. And is formed so that the at least one first plate and the at least one second plate are interconnected by the connecting member. The method according to claim 6,
The connecting member is a floating offshore structure, characterized in that the pin is connected through the circular hole and the long hole to move the girder in any one of the longitudinal direction and the transverse direction with respect to the stool when the hull swings. . The method according to claim 6,
The movement compensation connection compensates for the longitudinal movement,
The long hole is a floating offshore structure, characterized in that formed along the imaginary line connecting the stern with the bow of the hull. The method according to claim 6,
The movement compensation connection portion compensates for the lateral movement,
The long hole is a floating offshore structure, characterized in that formed in the horizontal direction of the imaginary line connecting the stern with the bow of the hull. 10. The method according to any one of claims 1 to 9,
Floating offshore structure further comprises a reinforcing plate for reinforcing the movement compensation connection is fixed to the lower portion of the truss structure.

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