KR102596128B1 - Structure of moonpool - Google Patents

Abstract

The moonpool structure is disclosed. The moonpool structure according to an embodiment of the present invention is a moonpool structure formed on a hull, and includes a variable width module extending in the longitudinal direction of the hull and forming a first moonpool space whose width is variable; And a width fixing module that communicates with the first door pool space at at least one of the front and rear of the first door pool space and forms a second door pool space whose width is fixed.

Description

Structure of moonpool}

The present invention relates to a moonpool structure.

Recently, drillships, which are more like ships and can carry drilling equipment and sail under their own power, have been developed and are being used for seafloor drilling. Such drill ships must be developed to have optimal navigation performance as well as drilling performance due to the requirement to frequently move locations to develop small oil fields.

An opening (hereinafter referred to as a moonpool) is installed in the drill ship to send the drilling pipe downward. The moonpool is an essential structure for the purpose of the drill ship, but it is a very disadvantageous structure in terms of speed performance during navigation.

In other words, during the navigation and operation of the drill ship, violent flows inside the moonpool, including the sloshing phenomenon caused by seawater, occur inside the moonpool. Due to the violent flow inside the moonpool, the resistance to the drill ship increases, the speed of the drill ship decreases when moving, and this causes an increase in fuel consumption of the drill ship. During work, the safety of workers is threatened due to the violent flow inside the moonpool. The background technology of the present invention is disclosed in Korean Patent Publication No. 10-2016-0009198 (January 26, 2016, Moonpool Structure).

Embodiments of the present invention seek to provide a door pull structure that can reduce internal flow.

According to one aspect of the present invention, there is a door pool structure formed on a hull, comprising: a variable width module extending in the longitudinal direction of the hull and forming a first door pool space whose width is variable; And a door pull structure can be provided, including a width fixing module that communicates with the first door pull space at least one of the front and rear of the first door pull space and forms a second door pull space whose width is fixed.

The horizontal cross section of the second door pool space may have a polygonal or circular shape.

The variable width module may perform a width reduction operation so that the width of the first door full space is smaller than the width of the second door full space.

The variable width modules are arranged facing each other and spaced apart in the width direction of the hull to form the first door pool space, and are a pair of modules each movable in the width direction of the hull so that the width of the first door pool space is variable. Mobile wall body; A driving unit that provides driving force to move each movable wall unit; And it may include a connecting wall portion connecting each of the movable wall portions and the width fixing module.

The driving unit may include a cylinder member that expands and contracts.

Both ends of the connecting wall portion are hinged to each of the movable wall portions and the width fixing module, and may have a length adjustment structure in which the length is adjusted in response to movement of the movable wall portion.

According to an embodiment of the present invention, the width variable module can effectively reduce internal flow by varying the width of the first door pool space to be smaller than the width of the second door pool space.

1 is a diagram schematically showing a portion of a hull on which a moonpool structure is installed according to an embodiment of the present invention.
Figure 2 is a diagram showing a top view of the door pull structure according to an embodiment of the present invention.
Figure 3 is a diagram showing the width variable module of Figure 2 changing the width of the first door pool space.
Figure 4 is a diagram showing a modification of the second door full space of Figure 2.
Figure 5 is a diagram for explaining the structure of the door pull structure of Figure 2 to reduce internal flow.
Figure 6 is an enlarged view of A in Figure 2.
Figure 7 is an enlarged view of B in Figure 3.
FIG. 8 is a view showing the line CC of FIG. 6 viewed in the direction of the arrow.

Since the present invention can be modified in various ways and can have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all transformations, equivalents, and substitutes included in the spirit and technical scope of the present invention. In describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, identical or corresponding components will be assigned the same drawing numbers and overlapping descriptions thereof will be omitted. do. In addition, in the following description, the terms first, second, etc. are terms used to describe various components, and their meaning is not limited, and is used only for the purpose of distinguishing one component from other components. do.

Figure 1 is a diagram schematically showing a part of the hull on which the moonpool structure according to an embodiment of the present invention is installed, Figure 2 is a diagram showing the moonpool structure according to an embodiment of the present invention as seen from above, and Figure 3 is This is a diagram showing how the width variable module of Figure 2 changes the width of the first door pool space.

For reference, in FIGS. 1 to 3, the + 2 and 3, the hull (10 in FIG. 1) is shown omitted, and in FIG. 2, the variable width module 1100 is shown in a width reduction operation, and in FIG. 3, the width variable module 1100 is shown in a width expansion operation. The appearance is shown.

Referring to FIGS. 1 to 3, the moon pull structure 1000 according to an embodiment of the present invention includes a variable width module 1100 and a fixed width module 1200, and is formed on the hull 10.

The moonpool structure 1000 according to this embodiment can form a moonpool space 20 penetrating the hull 10 in the vertical direction (for example, the Z-axis direction when viewed in FIG. 1). At this time, the moonfull space 20 may be composed of a first moonfull space 21 and a second moonfull space 22.

For example, the hull 10 may constitute a drill ship (not shown). In this case, the moonpool space 20 formed by the moonpool structure 1000 may form a passage for sending drilling equipment (not shown), such as a drilling pipe, to the seafloor below the hull 10.

The variable width module 1100 forms the first door pool space 21. At this time, the first door pool space 21 is formed by penetrating the hull 10 in the vertical direction as shown in FIG. 1.

The first door pool space 21 extends in the longitudinal direction of the hull 10 (for example, the X-axis direction as seen in FIG. 2) as shown in FIG. 2. In this case, the horizontal cross-section of the first door pool space 21 may have a square shape.

The first door pool space 21 has a variable width. Here, the width refers to the distance between two points facing each other and spaced apart in the width direction of the hull 10 (for example, the Y-axis direction as seen in FIG. 2).

At this time, the width variable module 1100 may be formed to vary the width of the first door full space 21 as shown in FIGS. 2 and 3. This will be described later.

The width fixing module 1200 forms the second door full space 22. At this time, the second door pool space 22 may be formed by penetrating the hull 10 in the vertical direction as shown in FIG. 1.

The second door pool space 22 extends in the longitudinal direction of the hull 10 as shown in FIG. 2. The second door full space (22) communicates with the first door full space (21). At this time, the first moon pool space 21 and the second moon pool space 22 may form a moon pool space 20 that penetrates the hull 10 in the vertical direction.

The horizontal cross section of the second door pool space 22 may have various shapes.

In this embodiment, the horizontal cross-section of the second door pool space 22 may have a polygonal shape as shown in FIG. 2.

In this case, the width fixing module 1200 may include a plurality of plate-shaped fixing wall portions 1211, 1212, 1213, 1214, and 1215. The plurality of fixed wall parts (1211, 1212, 1213, 1214, and 1215) may be connected so that the side facing the first door pool space (21) is open and the horizontal cross-section is polygonal.

These plurality of fixed wall parts 1211, 1212, 1213, 1214, and 1215 may each be fixed and supported on the hull 10.

At this time, the second door full space 22 may be an internal space of a plurality of fixed wall parts 1211, 1212, 1213, 1214, and 1215 connected to each other. In other words, the plurality of fixed wall portions 1211, 1212, 1213, 1214, and 1215 may form the edge side of the second door pool space 22.

For example, the horizontal cross section of the second door pool space 22 may have an octagonal shape as shown in FIG. 2, but this is only an example and the horizontal cross section of the second door pool space 22 may have various polygonal shapes such as a square.

In another embodiment, the horizontal cross-section of the second door pool space 22' may have a circular shape as shown in FIG. 4. For reference, FIG. 4 is a diagram showing a modification of the second door full space of FIG. 2.

In this case, the width fixing module 1200' includes one fixed wall part 1216', and the one fixed wall part 1216' may be extended so that the horizontal cross-section is circular. At this time, the second door pool space 22' may be an internal space surrounded by the fixed wall portion 1216'.

Referring to Figures 2 and 3, the width of the second door full space 22 is fixed.

For example, among the plurality of fixed wall parts (1211, 1212, 1213, 1214, 1215) forming the second door pool space (22) having a polygonal horizontal cross-section, any pair of fixed wall parts (1211, 1215) facing each other ) extend parallel to each other in the longitudinal direction of the hull 10, as shown in FIG. 2, and may be spaced apart from each other in the width direction of the hull 10. At this time, the distance between the pair of fixed wall parts 1211 and 1215 may be the width of the second door pool space 22.

The second door pool space 22 may be formed on at least one of the front and rear sides of the first door pool space 21. In other words, the fixed width module 1200 may be disposed on at least one of the front and rear of the variable width module 1100 forming the first door pool space 21.

For example, the fixed width module 1200 may be placed in front and behind the variable width module 1100 as shown in FIG. 2 . At this time, the second door full space 22 may be formed in front and behind the first door full space 21.

In this case, the second door full space 22 disposed in front of the first door full space 21 and the second door full space 22 disposed behind the first door full space 21 have respective horizontal cross-sectional shapes. They are identical and can have the same width.

Alternatively, the fixed width module, although not shown, may be placed in front or behind the variable width module. At this time, the second door pool space may be formed in front or behind the first door pool space.

In this embodiment, the width variable module 1100 may be formed to vary the width of the first door full space 21 as shown in FIGS. 2 and 3. In this case, the variable width module 1100 can vary the width of the first door pool space 21 depending on the movement of the hull (10 in FIG. 1) or the work situation.

In more detail, the width variable module 1100 is such that when the hull 10 moves or performs a desired operation such as drilling, as shown in FIG. 2, the width of the first door pool space 21 is changed to that of the second door pool space 22. The width can be reduced so that it becomes smaller than the width. In other words, the width of the central portion (i.e., the first moon pool space 21) of the moon pool space 20 may be smaller than the width of both side portions (i.e., the second moon pool space 22).

In this case, the door pull structure 1000 according to this embodiment may have a structure in which the second door pull space 22 forms a horizontal cross-section with a relatively larger width than the first door pull space 21.

The moonpool structure 1000 having this structure can have the following effects.

Among the internal flows occurring in the door pool structure 1000, the internal flow moving from the first door pool space 21 to the relatively large second door pool space 22 (see solid arrow in Figure 5) is shown in Figure 5. Flow energy can be reduced by dispersing and moving in various directions along the edge side of the two-door pool space (22). For reference, FIG. 5 is a diagram illustrating the structure of the door pull structure 1000 of FIG. 2 to reduce internal flow.

In addition, among the internal flows occurring in the door pool structure 1000, the internal flow that moves from the relatively large second door pool space 22 to the first door pool space 21 (see the dotted arrow in FIG. 5) is shown in FIG. Likewise, in the process of moving from different directions of the second door pool space 22 to the first door pool space 21, the flow energy may be reduced by canceling each other out.

Therefore, in the door pull structure 1000 according to this embodiment, the width variable module 1100 changes the width of the first door pull space 21 to be smaller than the width of the second door pull space 22, thereby effectively reducing the internal flow. You can do it.

Alternatively, the variable width module 1100 may perform a width expansion operation to increase the width of the first door pool space 21 when preparing for an operation such as moving drilling equipment to the seabed, as shown in FIG. 3. At this time, the variable width module 1100 may expand the width of the first door full space 21 than the width of the first door full space 21 formed by the width reduction operation.

For example, the variable width module 1100 may operate to expand the width of the first door full space 21 to correspond to the width of the second door full space 22, as shown in FIG. 3.

In this case, the door pool structure 1000 according to the present embodiment expands the width of the first door pool space 21, thereby forming the moon pool space 20 formed by the first door pool space 21 and the second door pool space 22. Damage from collision with moving drilling equipment can be prevented. Furthermore, drilling equipment, etc. can move to the seafloor more quickly and effectively through the moonpool space 20.

In this embodiment, the variable width module 1100 may include a pair of movable wall parts 1111 and 1112, a driving part 1120, and a connecting wall part 1130, as shown in FIGS. 2 and 3.

A pair of movable wall parts 1111 and 1112 may each extend in the longitudinal direction of the hull 10 as shown in FIG. 2. For example, each movable wall part (1111, 1112) may be provided in the form of a plate.

A pair of movable wall parts 1111 and 1112 may be arranged to be spaced apart in the width direction of the hull 10 when facing each other. At this time, the first door full space 21 may be an internal space of a pair of spaced apart movable wall parts 1111 and 1112. In other words, the pair of moving wall parts 1111 and 1112 may form the edge sides of the first door full space 21, that is, the left and right sides of the first door full space 21.

A pair of movable wall units 1111 and 1112 can each move in the width direction of the hull 10. At this time, the pair of movable wall units 1111 and 1112 can be moved so that the width of the first door pool space 21 is variable.

In this case, the pair of movable wall units 1111 and 1112 can be moved to approach each other as shown in FIG. 2 . At this time, the pair of movable wall parts 1111 and 1112 can be reduced in width so that the width of the first door full space 21 is smaller than the width of the second door full space 22 (see bold arrow in FIG. 2). .

Alternatively, the pair of movable wall units 1111 and 1112 may be moved away from each other as shown in FIG. 3 . At this time, the pair of movable wall parts 1111 and 1112 can be operated to expand the width of the first door pool space 21 (see bold arrow in FIG. 3).

The driving unit 1120 may provide driving force for each movable wall unit 1111 and 1112 to move. In other words, each movable wall part 1111 and 1112 can move in the width direction of the hull 10 by the driving force of the driving part 1120.

For example, the driving unit 1120 may include a cylinder member 1121 that expands and contracts.

The cylinder member 1121 may be shaped to extend in the width direction of the hull 10. The cylinder member 1121 may have one end facing the movable wall units 1111 and 1112 supported by the movable wall units 1111 and 1112, and the other end supported by the ship body (10 in FIG. 1). In this case, the movable wall parts 1111 and 1112 may be movably supported with respect to the hull 10 through the cylinder member 1121.

The cylinder member 1121 expands and contracts in the width direction of the hull 10, and the movable wall parts 1111 and 1112 are supported by the cylinder member 1121 and can move in the width direction of the hull 10.

In this case, the cylinder member 1121 can be extended so that one end is away from the hull 10 as shown in FIG. 2 (see dotted arrow in FIG. 2). At this time, the movable wall parts 1111 and 1112 can be supported by the cylinder member 1121 that expands and reduces its width.

Alternatively, the cylinder member 1121 may be contracted so that one end becomes closer to the hull 10 as shown in FIG. 3 (see dotted arrow in FIG. 3). At this time, the movable wall parts 1111 and 1112 may expand their width while being supported by the cylinder member 1121 that contracts.

In addition, although the driving unit is not shown, it may be provided in various structures capable of providing driving force to each movable wall unit.

The connecting wall portion 1130 can connect each movable wall portion 1111 and 1112 and the width fixing module 1200. In this case, the connecting wall portion 1130 may connect the end of each movable wall portion (1111, 1112) and the end of the width fixing module 1200 close to the end.

In this embodiment, four connecting wall portions 1130 may be provided. In this case, the four connecting wall parts 1130 may be disposed on the front left, front right, rear right, and rear left, respectively, with respect to the first door pool space 21 when viewed in FIG. 2.

For reference, hereinafter, the connection wall section 1130 disposed on the front left side of the first door pool space 21 among the four connection wall sections 1130 will be described in detail, and the remaining three connection wall sections 1130 are There is a difference in the arrangement position from the connecting wall portion 1130 disposed on the front left of the first door pool space 21, but the structure and operating mechanism are substantially the same, so detailed description thereof will be omitted.

The connecting wall portion 1130 according to the present embodiment (i.e., the connecting wall portion 1130 disposed on the front left side with respect to the first door pool space 21 when viewed in FIG. 2) is adapted to the movement of the movable wall portion 1111. Correspondingly, the movable wall portion 1111 and the width fixing module 1200 can be connected.

At this time, the connecting wall portion 1130 has both ends hinged to the movable wall portion 1111 and the width fixing module 1200, respectively, and has a length adjustment structure whose length is adjusted in response to the movement of the movable wall portion 1111. You can. In this case, the connecting wall portion 1130 can effectively connect the moving movable wall portion 1111 and the fixed width fixing module 1200 when the movable wall portion 1111 operates to reduce or expand the width.

For example, the connecting wall unit 1130 may include a first connecting wall unit 1131, a second connecting wall unit 1132, and a length adjustment unit 1133, as shown in FIGS. 6 and 7. For reference, Figure 6 is a view showing an enlarged view of A in Figure 2, and Figure 7 is a view showing an enlarged view of B in Figure 3. In Figures 6 and 7, the movement of the movable wall portion 1111 is shown, respectively. It is shown that the length of the connecting wall portion 1130 is adjusted in response.

The first connection wall unit 1131 and the second connection wall unit 1132 may each be provided in the form of a plate extending between the movable wall portion 1111 and the width fixing module 1200.

As shown in FIG. 6, the first connecting wall unit 1131 is hinged at its end closer to the movable wall unit 1111, and the end farther from the movable wall unit 1111 and 1112 is fixed in width. It may extend toward module 1200.

As shown in FIG. 6, the second connection wall unit 1132 has an end close to the width fixing module 1200 hinged to the width fixing module 1200, and an end farthest from the width fixing module 1200 is a movable wall unit ( 1111). In this case, the second connecting wall unit 1132 is a fixed wall part ( 1211) can be hinged.

The first connection wall unit 1131 and the second connection wall unit 1130 may be arranged to face each other. At this time, the first connection wall unit 1131 and the second connection wall unit 1132 are connected to one side of the end farthest from the movable wall portion 1111 of the first connection wall unit 1131 and the second connection wall unit 1132. ) can be arranged so that one side of the far end of the width fixing module 1200 faces each other and overlaps.

The length adjustment unit 1133 can connect the first connection wall unit 1131 and the second connection wall unit 1132 in a sliding manner in response to the movement of the movable wall unit 1111.

For example, the length adjustment unit 1133 includes a guide rail 1133a formed on one side of the first connecting wall unit 1131 and a roller 1133b formed on one side of the second connecting wall unit 1132, as shown in Figure 8. ) may include. For reference, FIG. 8 is a view showing the line CC of FIG. 6 viewed in the direction of the arrow.

In this case, the guide rail (1133a) protrudes from one side of the first connection wall unit 1131 toward one side of the second connection wall unit 1132 and extends in the direction of extension of the first connection wall unit 1131. It can be.

The roller 1133b may be rotatably supported on a support shaft 1133c protruding from one side of the second connection wall unit 1132 toward one side of the first connection wall unit 1131. The roller 1133b can be accommodated in the guide groove of the guide rail 1133a to enable rolling movement.

The first connection wall unit 1131 and the second connection wall unit 1132 can slide against each other through the rolling movement of the roller 1133b in response to the movement of the movable wall unit 1111.

In this case, the first connection wall unit 1131 and the second connection wall unit 1132 can slide so as to spread out from each other when the movable wall unit 1111 moves to reduce its width as shown in FIGS. 2 and 6. At this time, the connecting wall portion 1130 may decrease in length when the movable wall portion 1111 operates to reduce its width.

Alternatively, the first connection wall unit 1131 and the second connection wall unit 1132 may slide so as to overlap each other when the movable wall unit 1111 operates to expand its width, as shown in FIGS. 3 and 7 . At this time, the connecting wall portion 1130 may increase in length when the movable wall portion 1111 operates to expand its width.

Meanwhile, although not shown, the first connection wall unit and the second connection wall unit may be watertightly connected to prevent water inside the first door pool space and the second door pool space from moving to the outside.

Meanwhile, although not shown, the connecting wall portion may be provided in various structures that can connect the movable wall portion and the width fixing module, such as an expansion member that expands and contracts in response to the movement of the movable wall portion.

Although the embodiments of the present invention have been described above, those skilled in the art can add, change, delete or add components without departing from the spirit of the present invention as set forth in the patent claims. The present invention may be modified and changed in various ways, and this will also be included within the scope of rights of the present invention.

10: Hull 20: Moonpool space
21: 1st door full space 22, 22': 2nd door full space
1000: Moonpool structure 1100: Variable width module
1111, 1112: movable wall part 1120: driving part
1130: Connecting wall part 1200, 1200': Width fixing module

Claims (4)

As a moonpool structure formed on the hull,
A variable width module extending in the longitudinal direction of the hull and forming a first door pool space whose width is variable; and
It includes a width fixing module that communicates with the first door pool space at at least one of the front and rear of the first door pool space and forms a second door pool space whose width is fixed,
The variable width module is,
a pair of movable wall parts that face each other and are spaced apart in the width direction of the hull to form the first moon pool space, and are each movable in the width direction of the hull so that the width of the first moon pool space is variable;
a driving unit that provides driving force to move each movable wall part of the pair of movable wall parts; and
A door pull structure comprising a connecting wall portion connecting each of the movable wall portions and the width fixing module. According to paragraph 1,
The variable width module is a door pull structure that operates so that the width of the first door pull space is smaller than the width of the second door pull space. delete According to paragraph 1,
The connecting wall portion is hinged at both ends to each of the movable wall portions and the width fixing module, and has a length adjustment structure whose length is adjusted in response to movement of the movable wall portion.

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