KR101516552B1 - Cargo barrier structure - Google Patents

Abstract

A cargo hold barrier structure is disclosed. A cargo hold barrier structure according to an embodiment of the present invention includes an upper heat insulating board provided between a primary barrier and a secondary barrier; And a strip member interposed between the upper heat insulating board and the primary wall, wherein the strip member is movably disposed in the joining region of the upper heat insulating board in accordance with the contraction expansion of the primary wall.

Description

Cargo barrier structure {CARGO BARRIER STRUCTURE}

The present invention relates to a cargo hold barrier structure.

The barrier structure of a vessel cargo hold carrying a cryogenic fluid is typically a structure in which a primary barrier, an upper insulation board, a secondary barrier and a lower insulation board are sequentially combined. This is to prevent further leakage of the fluid in the secondary barrier if there is a small leakage of the cryogenic fluid in the primary barrier.

The process of installing a barrier in a cargo hold typically involves fixing a plurality of lower insulation boards having the same thickness on the inner wall of the cargo hold, installing a secondary barrier on the lower insulation board, installing an upper insulation board and a primary barrier on top of the secondary barrier . At this time, in a state where the lower heat insulating board, the secondary wall and the upper heat insulating board are joined to the inner wall of the cargo hold adjacent to each other, the space between the upper part of the main secondary wall and the upper heat insulating board A secondary barrier and a connection board may be installed, and a primary barrier may be provided above the upper insulation board.

In such a cargo hold wall, the heat insulating member included in the upper insulating board and the lower insulating board is composed of a heat insulating material such as a foam, but a significant amount of shrinking displacement occurs at a cryogenic temperature condition due to a coefficient of thermal expansion (CTE) . That is, thermal expansion due to the cryogenic fluid causes shrinkage expansion in the primary barrier and the like, which may weaken the durability of the cargo barrier walls. In this regard, Korean Patent Laid-Open Publication No. 2012-0120800 (published on November 2, 2012) discloses a technique relating to the insulation structure of a liquefied natural gas cargo hold.

Patent Document 1: Korean Patent Publication No. 2012-0120800 (published on November 2, 2012)

Embodiments of the present invention provide a cargo hold barrier structure that reduces thermal stresses due to cryogenic fluids and improves the durability of cargo hold barriers.

According to an aspect of the present invention, there is provided an upper insulating board provided between a primary barrier and a secondary barrier; And a strip member interposed between the upper insulating board and the primary barrier, wherein the strip member is movable in accordance with the contraction expansion of the primary barrier, May be provided.

Wherein the upper heat insulating board includes an upper heat insulating member in the form of a plurality of unit moving blocks and a shield plate disposed on the upper heat insulating member, wherein the joining region includes a first step portion on which both end portions of the strip member are seated, And a second stepped portion to which an auxiliary plate for supporting both ends of the strip member from above is fixed.

The auxiliary plate is provided in a planar shape and includes a side portion that supports both end portions of the strip member and a second portion that is fixed to the second step portion by a coupling member coupled to the through hole, .

A thread hole may be formed on one side of the auxiliary plate so as to fix the strip member by the fastening member so that the strip member does not slip downward from the coupling region when the strip member is installed in the longitudinal direction.

The upper heat insulating board includes an upper heat insulating member in the form of a plurality of unit moving blocks and a shield plate disposed on the upper heat insulating member. The joining region may be formed in the shield plate in such a manner that both ends of the strip member are inserted. have.

The strip member may include a bonding portion to which the primary barrier is bonded, and the bonding portion may be provided in a plane shape extending from the both end portions at a predetermined height so as to be located on the same plane as the upper end of the protection plate.

The joining region may be formed in at least one of a transverse direction and a longitudinal direction of the shroud, and the strip member may be disposed at a distance of two or more from the joining region.

The primary barrier may be welded to the top of the strip member.

A lower sub-panel disposed between the secondary barrier and a lower heat-insulating board disposed in an upper portion of the inner wall of the cargo hold, and a second sub-panel disposed movably in the depressed portion of the lower sub-panel and adapted to be moved along the contraction and expansion direction of the secondary barrier And a moving block in which at least a part of the upper peripheral portion is welded to the secondary barrier.

An upper auxiliary panel provided below the upper insulating board and an impact absorbing layer provided between the upper auxiliary panel and the secondary barrier.

A spacer which is coupled to the stud bolt and is disposed at an upper portion of the moving block and has a central portion penetrated therethrough; and a spacer disposed on the spacer bolt, A washer having a peripheral portion contacting an upper end of the upper sub-panel, and a nut fastened to the stud bolt and tightened to apply a force to the washer.

The cargo barrier structure according to an embodiment of the present invention can reduce the thermal stress caused by the cryogenic fluid, thereby improving the durability of the cargo barrier wall.

In addition, a strip member that is movable in accordance with the expansion and contraction of the primary barrier can be disposed to reduce the thermal stress caused by the cryogenic fluid, thereby improving the durability of the cargo barrier wall.

In addition, a moving block movable in accordance with expansion and contraction of the secondary barrier may be disposed to reduce thermal stress caused by the cryogenic fluid, thereby improving the durability of the cargo barrier wall.

FIG. 1 is a cross-sectional view illustrating a barrier structure of a ship cargo hold having a strip member according to an embodiment of the present invention. Referring to FIG.
2 is an enlarged sectional view of the portion A in Fig.
3 is a perspective view of the strip member of FIG. 1;
FIG. 4 is a cross-sectional view illustrating the shape of a coupling region formed on the protection plate of the upper heat insulating board on which the strip member of FIG. 1 is disposed.
FIG. 5 is a cross-sectional view showing another example of the installation of the strip member of FIG. 1;
FIG. 6 is a cross-sectional view illustrating a shape of a coupling region formed on a protection plate of an upper heat insulation board on which a strip member according to another example of FIG. 5 is disposed.
FIG. 7 is a cross-sectional view showing a form in which a thread hole is provided in an auxiliary plate for supporting both end portions of the strip member in FIG.
FIG. 8 is a plan view of a strip member according to an embodiment of the present invention.
FIG. 9 is a cross-sectional view showing a modification of the barrier structure of the ship holding vessel of FIG. 1, in which a thermal stress reduction unit is added together with a strip member.
10 is an enlarged cross-sectional view of the portion B in FIG.
11 is an exploded perspective view of the coupling unit of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

FIG. 1 is a cross-sectional view illustrating a barrier structure of a ship cargo hold having a strip member according to an embodiment of the present invention. Referring to FIG. 2 is an enlarged cross-sectional view of portion A of Fig. 3 is a perspective view of the strip member of FIG. 1. FIG. 4 is a cross-sectional view illustrating the shape of a coupling region formed in the protection plate of the upper heat insulating board on which the strip member of FIG. 1 is disposed.

1, a barrier structure of a vessel cargo hold that stores a cryogenic fluid (e.g., liquefied natural gas (LNG)) according to an embodiment of the present invention includes a lower insulation board 10, an upper insulation board 20, (30) and a strip member (100).

The lower insulation board 10 is provided between the cargo hold inner wall 2 and the secondary barrier 50 and includes a lower protection plate 11 and a lower insulation member 12. The lower protective plate 11 is fixed to the cargo hold inner wall 2 by a mastic 4, a stud bolt (not shown) or the like. The lower protection plate 11 may be made of a material such as plywood. The lower heat insulating member 12 is made of a polyurethane foam (PUF), a reinforced polyurethane foam (R-PUF), or the like to protect the hull from a fluid at a cryogenic temperature. The lower heat insulating member 12 can be bonded to the upper portion of the lower protective plate 11 by an adhesive (for example, glue or the like). A filling member 6 such as a glass wool can be inserted and filled in the space between the lower heat insulating members 12 to maintain the heat insulating performance.

The upper insulation board 20 is provided between the primary barrier 60 and the secondary barrier 50 and includes an upper insulation member 21 in the form of a plurality of unit moving blocks and a first protection plate (22). The upper heat insulating member 21 may be made of the same material as the lower heat insulating member 12 and the first protecting plate 22 may be made of a material such as plywood. The primary barrier 60 is made of a metal material such as stainless steel (SUS) or the like, and can be installed on the upper insulating board 20 in various known forms and ways, and thus a detailed description thereof will be omitted. In addition, the secondary barrier 50 includes a primary secondary barrier 51 and an auxiliary secondary barrier 52. The main secondary barrier 51 is laminated on the lower insulation board 10. The main secondary barrier 51 may be composed of a plurality of sheets made of a metal material such as stainless steel, aluminum, brass, zinc, or the like. Further, as another example, the primary secondary barrier 51 may be composed of a composite sheet composed of a metal sheet and a fiber-reinforced composite material. The auxiliary secondary barrier 52 may also be composed of a plurality of sheets made of a metallic material, like the primary secondary barrier 51.

The connecting board 30 is interposed between the upper heat insulating boards 20 on both sides and includes a connecting member 31 interposed between the upper insulating members 21 and a second protecting plate 32 disposed on the upper portion of the connecting member 31 do.

The strip member 100 is interposed between the upper insulating board 20 and the primary barrier 60, as shown in FIGS. The strip member 100 is disposed in a groove-shaped engagement region 22a (see Fig. 4) formed in the first protection plate 22 of the upper heat insulating board 20 so as to be movable in accordance with the contraction expansion of the primary barrier 60 . The primary barrier 60 is welded to the upper part of the strip member 100 and the strip member 100 moves according to the movement of the primary barrier 60 which expands and contracts due to thermal stress. This can alleviate the thermal stress and improve the durability of the cargo barrier walls. The primary barrier 60 may be provided in such a manner as to press the upper portion of the strip member 100 so that the strip member 100 moves together with the contraction expansion of the primary barrier 60. The strip member 100 may be made of, for example, stainless steel or the like.

2 and 3, when the strip member 100 is disposed at the both end portions 101 and the joining region 22a (see FIG. 4) where the strip member 100 is formed on the first protection plate 22, May be provided in a plate shape having a planar joint 102 extending at a predetermined height from both ends 101 so as to be located on the same plane as the upper end of the first protection plate 22. [ At this time, the primary barrier 60 is bonded to the upper surface of the joint portion 102.

2 and 4, the engaging region 22a of the first protection plate 22 on which the strip member 100 is disposed includes a first step portion D1 on which both end portions 101 of the strip member 100 are seated, And a second stepped portion D2 in which the auxiliary plate 110 supporting the both end portions 101 of the strip member 100 from above is disposed.

The auxiliary plate 110 has a through hole H1 to which a coupling member such as a rivet 7 and the like is coupled at one side portion of the strip member 100 supporting both ends 101 of the strip member 100 from above, Which is fixed to the second stepped portion D2 by the second stepped portion D2. The rivet 7 is coupled to the through hole H1 of the auxiliary plate 110 and the coupling groove 7a formed in the first protection plate 22 so that the auxiliary plate 110 and the first protection plate 22, 1 upper protective member 22 is joined to the upper heat insulating member 21.

Fig. 5 is a cross-sectional view showing another example of the strip member installation form of Fig. 1. Fig. 6 is a cross-sectional view illustrating the shape of a coupling region formed on the protection plate of the upper heat insulation board on which the strip member according to another example of FIG. 5 is disposed.

5 and 6, the coupling region 22a of the first protection plate 22 may be provided in a manner that both end portions 101 of the strip member 100 are inserted. That is, the first protection plate 22 can form the insertion grooves H3 on both sides of the region where the both end portions 101 of the strip member 100 are inserted. In this case, since the both end portions 101 of the strip member 100 are supported by the first protection plate 22, the above-described auxiliary plate 110 can be omitted. Similarly, the joining portion 102 may be provided in a plane shape extending from both ends 101 at a predetermined height so as to be positioned on the same plane as the upper end of the first protection plate 22. [ In FIGS. 5 and 6, the primary barrier 60 joined to the upper surface of the joint portion 102 is not shown for convenience of explanation.

FIG. 7 is a cross-sectional view showing a form in which a thread hole is provided in an auxiliary plate for supporting both end portions of the strip member of FIG. 4;

7 (a) and 7 (b), the above-described strip member 100 includes not only a through hole H1 for engaging with a coupling member including a rivet 7 but also a fixing bolt (not shown) The threaded hole H2 to which the fastening member including the fastening member is fastened can be formed. This is to fix (temporarily) the strip member 100 so that the strip member 100 does not slide down due to its own load when the cargo hold wall is installed in the longitudinal direction. After the strip member 100 is fixed in this way, the primary barrier 60 (see FIG. 2) is welded to the strip member 100. Then, the fixing bolt (not shown) fastened to the thread hole H2 is unfastened again. 6) of the first protective plate 22 into which the both end portions 101 of the strip member 100 are inserted, although not shown in this case, A threaded hole H2 may be formed upward. For reference, Fig. 7 (b) shows a state in which the rivet 7 is not fastened for convenience of explanation.

FIG. 8 is a plan view of a strip member according to an embodiment of the present invention.

8, a strip member 100 according to an embodiment of the present invention includes a first protection plate 22 and a second protection plate 22. The strip member 100 is formed in a coupling region 22a formed in at least one of a lateral direction and a longitudinal direction of the first protection plate 22, . As the primary barrier 60 contracts and expands due to thermal stress, the strip members 100 move in the transverse and longitudinal directions together, thereby reducing the thermal stress and improving the durability of the cargo barrier walls.

FIG. 9 is a cross-sectional view showing a modification of the barrier structure of the ship holding vessel of FIG. 1, in which a thermal stress reduction unit is added together with a strip member. 10 is an enlarged cross-sectional view of portion B of FIG. 11 is an exploded perspective view of the coupling unit shown in FIG.

Referring to FIG. 9, there is shown a heat exchanger provided between the lower heat insulating board 10 and the upper heat insulating board 20 along with the above-described strip member 100 to be movable in accordance with contraction and expansion of the secondary wall 400, A thermal stress reduction unit for reducing stress can be additionally disposed. At this time, the upper sub-panel 600 is disposed below the upper heat insulating member 21 and the lower sub-panel 200 is disposed above the lower heat insulating member 12. [ A secondary barrier 400 is disposed above the lower sub-panel 200 and a sloshing shock due to liquefied gas stored in the interior of the cargo hold is provided between the secondary barrier 400 and the upper sub- An impact absorbing layer 500 for protecting the cargo barrier walls from the impact absorbing layer 500 is disposed. In order to arrange the thermal stress reduction unit, a plug member 9 filled with a foam or the like and a cover 8 made of plywood or the like are disposed between the upper heat insulating members 21 on the upper portion of the thermal stress reduction unit . For convenience of explanation, the above-described primary barrier 60 is not shown.

Here, the sub-panels 200 and 600 may be made of plywood or the like. In addition, the secondary barrier 400 may be made of a metal material such as stainless steel (SUS) or the like. The impact absorbing layer 500 may be made of, for example, melamine foam as a foam material. Melamine foam is an open type foam based on amino resin type melamine resin, which not only absorbs impact but also has excellent heat insulation performance. However, the present invention is not limited to this, and the shock absorbing layer 500 can be made of various materials capable of protecting the cargo barrier wall from the sloshing shock caused by the liquefied gas stored inside the cargo hold.

10 and 11, the thermal stress reduction unit described above may include a moving block 300, a fixing piece 320, a coupling portion 800, and a spacer 900.

The movable block 300 is movably seated in the depressed portion of the lower sub-panel 200 and at least a portion of the upper periphery may be welded (see C in Fig. 10) to the secondary barrier 400 . This is because the movement block 300 moves in accordance with the expansion and contraction of the secondary barrier 400 to reduce the thermal stress caused by the cryogenic fluid to improve the durability of the cargo barrier.

The moving block 300 may be provided with a coupling hole, a coupling hole formed with a thread at the center thereof, and a circular shape having a step. For example, a stud bolt 810 may be used as a coupling member. The moving block 300 may be formed such that the diameter of the second step 302 formed on the first step 303 on the basis of the center line X is smaller than the diameter of the first step 303. [

The depressed portion of the lower sub-panel 200 on which the moving block 300 is mounted may be larger than the width of the moving block 300 so that the moving block 300 is seated and movable. The depressed portion of the lower sub-panel 200 may be formed to have a height corresponding to the moving block 300. The first depressed portion 210 and the second depressed portion 220, each having a circular step, . ≪ / RTI >

Here, the diameter of the second depression 220 may be greater than the diameter of the first depression 210. The height of the first depressed portion 210 is set to be greater than the height of the first stepped portion 303 of the moving block 300 so that the peripheral portion of the upper end of the first stepped portion 303, At least a part of which can be covered by the fixing piece 320 disposed in the second depression 220.

The fixing member 320 may be a circular plate having a through hole 320a and may be fixed to the lower sub-panel 200 by a joining member including a rivet 322 or the like. The upper end of the fixing piece 320 disposed on the second depression 220 and the second stepped portion 302 of the moving block 300 may be located on the same plane.

The engaging portion 800 includes a stud bolt 810, a washer 820, and a nut 830. The stud bolt 810 is engaged with the engaging hole 301 of the moving block 300. The washer 820 is coupled to the stud bolt 810 in the same manner as the spacer 900 to be described later and is disposed on the upper portion of the spacer 900 so that the peripheral portion thereof is in contact with the upper end of the upper sub- The nut 830 is disposed on the upper portion of the washer 820 and fastened to the stud bolt 810 so as to apply a predetermined pressure to the washer 820.

The spacer 900 is disposed on the moving block 300 to support the washer 820 and maintain a constant gap between the washer 820 and the moving block 300. This allows the block 300 to effectively perform the sliding motion in accordance with the thermal deformation of the secondary barrier 400. [ The spacer 900 may be formed, for example, in a cylindrical shape passing through a central portion. The height of the spacer 900 may be equal to or smaller than the height of the upper portion of the upper sub-panel 600 when the spacer 900 is disposed on the upper portion of the moving block 300 .

Hereinafter, a method of installing the thermal stress reduction unit on the basis of the contents of Figs. 9 to 11 will be described.

The movable block 300 is mounted on the depressed portion of the lower sub panel 200 and the peripheral portion of the upper end of the first step portion 303 of the movable block 300 is at least partially covered by the fixing piece 320 And fixes the fixing piece 320 to the second depression 220.

Next, the movable block 300 and the secondary barrier 400 are welded together. Here, an impact absorbing layer 500 and an upper sub-panel 600 are stacked on the secondary barrier 400.

Next, the stud bolt 810 is coupled to the engaging hole 301 of the moving block 300, and the spacer 900 and the washer 820 are fixed to the moving block 300 with the stud bolt (810).

Next, the nut 830 is fastened to the stud bolt 810 so as to apply a predetermined pressure to the washer 820. At this time, downward force is applied to one side portion of the upper sub-panel 600, the impact absorbing layer 500, and the secondary barrier 400 interposed between the washer 820 and the moving block 300. As a result, effective coupling between the heat insulating members 12 and 21, the auxiliary panels 200 and 600, the secondary barrier 400, and the impact absorbing layer 500 can be achieved. However, it is possible to tighten the nut 830 so that the movement of the mobile block 300 is not hindered by excessive force.

The foregoing has shown and described specific embodiments. However, it is to be understood that the present invention is not limited to the above-described embodiment, and various changes and modifications may be made without departing from the scope of the technical idea of the present invention described in the following claims It will be possible.

10: lower insulation board 20: upper insulation board
21: upper heat insulating member 22: first shield plate
30: connection board 50: secondary barrier
60: primary barrier 100: strip member
110: auxiliary plate 200: lower sub-panel
300: moving block 320:
400: secondary barrier 500: shock absorbing layer
800: coupling part 900: spacer

Claims (11)

An upper insulating board provided between the primary barrier and the secondary barrier; And
And a strip member interposed between the upper insulating board and the primary barrier,
Wherein the strip member is movably disposed in an engagement region of the upper heat insulating board in accordance with contraction expansion of the primary barrier,
Wherein the upper heat insulating board includes an upper heat insulating member in the form of a plurality of unit moving blocks and a protection plate disposed on the upper heat insulating member,
Wherein the coupling region comprises a first step formed on the protection plate and on which both ends of the strip member are seated and a second stepped portion on which an auxiliary plate supporting both ends of the strip member is fixed from above. delete The method according to claim 1,
The auxiliary plate is provided in a planar shape and includes a side portion for supporting both end portions of the strip member and a second side portion which is fixed to the second step portion by a coupling member coupled to the through hole, Cargo hold barrier structure. The method of claim 3,
And a thread hole for fixing the strip member by a fastening member is formed on one side of the auxiliary plate so that the strip member does not slide downward from the coupling region when the strip member is installed in the longitudinal direction. The method according to claim 1,
Wherein the upper heat insulating board includes an upper heat insulating member in the form of a plurality of unit moving blocks and a protection plate disposed on the upper heat insulating member,
Wherein the coupling region is formed in the shield plate in such a manner that both ends of the strip member are inserted. 6. The method according to any one of claims 1 to 5,
Wherein the strip member includes a bonding portion to which the primary barrier is bonded, and the bonding portion is formed in a plane shape extending from the both end portions at a predetermined height so as to be located on the same plane as the upper end of the protection plate. 6. The method according to any one of claims 1 to 5,
Wherein the coupling region is formed in at least one of a lateral direction and a longitudinal direction of the protection plate, and the strip member is disposed in the coupling region such that two or more of the strip regions are spaced apart from each other by a predetermined distance. 6. The method according to any one of claims 1 to 5,
Wherein the primary barrier is welded to an upper portion of the strip member. The method according to claim 1,
A lower sub-panel disposed between the secondary barrier and a lower heat-insulating board disposed above the inner wall of the hold,
Further comprising a moving block that is movably seated in the depressed portion of the lower sub-panel and is welded to the secondary barrier such that at least a portion of the upper periphery is welded to the secondary barrier to move along the contraction and expansion direction of the secondary barrier, rescue. 10. The method of claim 9,
An upper sub-panel provided below the upper heat-insulating board,
And a shock absorbing layer provided between the upper sub-panel and the secondary barrier. 11. The method of claim 10,
A stud bolt coupled to a coupling hole of the moving block,
A spacer which is coupled to the stud bolt and is disposed on the upper portion of the mobile block,
A washer which is coupled to the stud bolt and is disposed on the spacer, the periphery of which is in contact with the upper end of the upper sub-panel,
And a nut fastened to the stud bolt and tightened to apply a force to the washer.

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