KR20130099907A - Cargo barrier structure - Google Patents

Abstract

PURPOSE: A cargo barrier structure is provided to efficiently perform a welding work on a set position without an additional marking work. CONSTITUTION: A cargo barrier structure comprises an upper insulation board (110), a lower insulation board (160), and a lower auxiliary panel (150). The upper insulation board is formed between a first barrier and a second barrier (140). The lower insulation board is fixed to the inner top of a cargo. The lower auxiliary panel is inserted between the upper and lower insulation boards, and a first mounting groove is formed on the top surface thereof. The second barrier is formed in the first mounting groove.

Description

Cargo Barrier Structures {CARGO BARRIER STRUCTURE}

The present invention relates to a cargo hold barrier structure.

The barrier structure of a cargo hold for carrying 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. Secondary barriers include primary and secondary secondary barriers.

The barrier installation process of the cargo hold is usually fixed to the inner wall of the cargo hold a plurality of lower insulation boards having the same thickness, the main secondary barrier is installed on the upper upper insulation board, the upper insulation board and the primary barrier on the upper primary barrier It takes place in the process of installing. At this time, in a state where the lower insulation board, the main secondary barrier and the upper insulation board are integrally installed on the inner wall of the cargo hold adjacent to each other, an auxiliary secondary barrier is installed to cover the space between the main secondary barriers, After installing the connection board between the insulation board, the primary barrier can be installed on the upper insulation board.

The cargo barrier is composed of a thermal insulation material such as a foam in the upper insulation board and the lower insulation board, but a considerable amount of shrinkage displacement occurs in cryogenic conditions due to the coefficient of thermal expansion (CTE). Done. That is, shrinkage expansion occurs in the primary secondary barrier and the like due to thermal stress caused by the cryogenic fluid, which may weaken the durability of the cargo hold barrier. In order to solve this problem, Korean Laid-Open Patent Publication No. 2012-0136324 (published Dec. 18, 2012) (hereinafter referred to as “prior art”) arranges a moving block provided to be movable according to shrinkage expansion of a primary secondary barrier. A technique for improving the durability of cargo hold barriers by reducing thermal stress caused by cryogenic fluids has been disclosed.

However, in the process of welding the main secondary barrier and the moving block, the main secondary barrier may be released from its original position. In addition, in order to prevent such departure, there is an inconvenience that a separate marking operation for fixing the main secondary barrier should be performed.

Korea Patent Publication No. 2012-0136324 (2012.12.18 published)

An embodiment of the present invention includes an upper insulation board provided between the primary barrier and the main secondary barrier; Lower insulation board is fixed to the upper inner wall of the cargo hold; And a lower auxiliary panel interposed between the upper insulation board and the lower insulation board and having a first seating groove formed on an upper surface thereof so that the main secondary barrier is seated thereon.

And further comprising secondary secondary barriers welded to each other so that both sides overlap each other on an upper surface of the primary secondary barrier to cover a space between the primary secondary barriers, and the lower auxiliary panel includes the primary secondary barrier and the secondary secondary barrier. It is possible to form a welding damage prevention groove in a position corresponding to the welding portion of the.

At least a part of the upper periphery further includes a moving block welded to the main secondary barrier so as to move along the contracted expansion direction of the main secondary barrier, and the lower auxiliary panel has a second seat on which the moving block is seated. Grooves can be formed.

The moving block may be provided in a shape having a step, and the second seating groove may include a first recessed part in which a fixing piece for pressing the movable block is fixed, and a second recessed part in which the movable block is seated.

The lower sub-panel may form a third seating groove in which a fixing piece for fixing the stud bolt is seated so that the stud bolt is positioned in the through hole formed at the center portion of the main secondary barrier.

It may further include an upper auxiliary panel disposed below the upper insulation board, and an impact absorbing layer interposed between the upper auxiliary panel and the main secondary barrier.

According to an aspect of the present invention is installed on the upper portion of the support plate interposed between the lower auxiliary panel and the secondary barrier of the lower insulation board, the bolt coupling hole is coupled to the stud bolt fixed to the upper surface of the support plate in the center Lower fixation; A position adjusting part interposed between the lower fixing part and the secondary barrier such that the stud bolt is located at the center of the through hole of the secondary barrier; And a hollow portion formed inside, and an upper fixing portion fixed to an upper portion of the lower fixing portion in a form in which the stud bolt is inserted into the hollow portion.

In the cargo hold barrier structure according to the embodiment of the present invention, since the welding work is performed in a state in which the first seating recess is formed in the subsidiary panel and the main secondary barrier is seated in the first seating recess, a separate marking work is not performed. It is possible to efficiently perform the required welding work at the set position without having to.

In addition, by forming a welding damage prevention groove at a position corresponding to the welding portion of the main secondary barrier and the secondary secondary barrier in the lower auxiliary panel, the plywood material is formed by the heat of welding during the welding operation between the primary secondary barrier and the secondary secondary barrier. Damage to the lower subpanel can be prevented.

1 is a cross-sectional view of the barrier structure of the cargo hold according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of part A of the cargo hold barrier structure of FIG. 1 in which a thermal stress reduction unit is installed.
3 is an exploded perspective view of the thermal stress reduction unit shown in FIG.
4 is a plan view showing the stud bolt fixed to the moving block of the thermal stress reduction unit shown in Figure 2 exposed through the through hole of the secondary barrier.
FIG. 5 is a cross-sectional view illustrating a state in which a joining surface of the periphery of the through-hole of the secondary barrier shown in FIG. 4 and the fixing piece are joined by welding.
6 is a cross-sectional view illustrating a form in which a connection board is interposed between the upper insulation boards in the cargo hold barrier structure illustrated in FIG. 1.
FIG. 7 is a cross-sectional view illustrating a form in which a first seating groove and a weld damage preventing groove are formed in a lower auxiliary panel in the cargo hold barrier structure shown in FIG. 6.
FIG. 8 is a cross-sectional view of a portion of the lower subsidiary panel of FIG. 7 in which a second seating groove is formed for seating of the movable block.
FIG. 9 is a cross-sectional view of a portion of the lower auxiliary panel of FIG. 7 in which a third seating groove is formed for seating of the fixing piece.

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 numbers refer to like elements throughout.

1 is a cross-sectional view of the barrier structure of the cargo hold according to an embodiment of the present invention.

Referring to FIG. 1, the barrier structure of a cargo hold for storing cryogenic fluid (eg, liquefied natural gas (LNG)) according to an embodiment of the present invention includes an upper insulation board 110, an upper auxiliary panel 120, and an impact absorbing layer. 130, the lower auxiliary panel 150, the lower insulation board 160, and a thermal stress reduction unit.

The upper insulation board 110 is provided between the primary barrier 17 and the main secondary barrier 140, the upper insulation member 111 on which the primary barrier 17 is disposed, and the upper insulation member 111. The upper protection plate 112 of the lower portion. The upper insulation member 111 is made of a polyurethane foam material (PUF, Polyurethane Form), reinforced polyurethane foam (RPUF, Reinforced PUF) and the like can protect the hull from the fluid in the cryogenic state. The upper protection plate 112 may be made of a material such as plywood. The above-described primary barrier 17 is made of a metal material such as stainless steel (SUS), and may be installed on the upper insulation board 110 in various known forms and manners, and thus, detailed description thereof will be omitted.

The upper subpanel 120 may be disposed below the upper insulation board 110 and may be made of plywood or the like. In this case, the upper auxiliary panel 120 may be included in the upper insulation board 110 to be integrally provided.

The shock absorbing layer 130 is interposed between the upper auxiliary panel 120 and the main secondary barrier 140, and protects the cargo hold barrier from sloshing impact by liquefied gas stored in the cargo hold. The shock absorbing layer 130 may be made of melamine foam, for example, as a foam material. Melamine foam is an open foam based on melamine resin, which is an amino resin series, and can absorb shocks and provide excellent thermal insulation performance. However, the present invention is not limited thereto, and the shock absorbing layer 130 may be made of various materials that may protect the cargo hold barrier from sloshing shock caused by the liquefied gas stored inside the cargo hold.

The lower subpanel 150 is interposed between the upper insulation board 110 and the lower insulation board 160, and forms a first seating groove S1 (see FIG. 7) so that the main secondary barrier 140 is seated on an upper surface thereof. do. The lower subpanel 150 may be made of plywood or the like. The primary secondary barrier 140 described above may be formed of a plurality of sheets made of a metal material such as stainless steel, aluminum, brass, zinc, or the like. In addition, as another example, the primary secondary barrier 140 may include a composite sheet composed of a metal sheet and a fiber reinforced composite material.

The lower insulation board 160 includes a lower protection plate 161 and a lower insulation member 162 disposed between the lower auxiliary panel 150 and the lower protection plate 161. The lower protection plate 161 may be fixed to the cargo hold inner wall 12 by a mastic 14, a stud bolt 16, or the like. In addition, the lower protective plate 161 may be made of a material such as plywood. The lower insulation member 162 may be made of a polyurethane foam material, reinforced polyurethane foam, or the like to protect the hull from the fluid in the cryogenic state. The lower insulation member 162 may be bonded to the upper portion of the lower protective plate 161 by an adhesive (for example, glue). In addition, the filling member 13, such as glass wool, may be inserted and filled in the space between the lower insulation members 162 to maintain thermal insulation performance.

FIG. 2 is an enlarged cross-sectional view of part A of the cargo hold barrier structure of FIG. 1 in which a thermal stress reduction unit is installed. 3 is an exploded perspective view of the thermal stress reduction unit shown in FIG. 2.

2 and 3, the thermal stress reduction unit is provided to be movable in accordance with the contraction and expansion of the primary secondary barrier 140 to reduce the thermal stress caused by cryogenic fluid, moving block 170, fixed piece 175, a coupling unit 180, and a spacer 190. In order to arrange the thermal stress reduction unit, a plug member 19 filled with a form or the like and a cover 18 made of plywood or the like may be disposed between the upper thermal insulation members 111 on the upper portion of the thermal stress reduction unit. Can be.

The moving block 170 is movably seated in the second seating groove S2 formed in the lower sub-panel 150. [ In addition, the movable block 170 is welded with the periphery of the through hole (H1, see FIG. 4) of the upper secondary wall 140 so that at least a portion of the upper peripheral portion moves in the contracted expansion direction of the primary secondary barrier 140. Can be bonded by (W1). For example, the welding W1 may be performed by any one of laser welding, plasma welding, degradation welding, and ultrasonic welding. As a result, the movable block 170 moves according to the expansion and contraction of the primary secondary barrier 140, thereby reducing the thermal stress caused by the cryogenic fluid, thereby improving durability of the cargo hold barrier.

In addition, the moving block 170 is coupled to the coupling member, and provides a coupling hole (H2) formed with a screw thread in the center, it may be provided in a circular shape having a step. For example, the stud bolt 181 may be used as the coupling member. The moving block 170 may have a diameter smaller than the diameter of the first step portion 171 of the second step portion 172 formed on the first step portion 171 based on the center line X. .

The second seating groove S2 may be provided larger than the width of the moving block 170 so that the movable block 170 is seated and movable. The second seating groove S2 may be formed to have a height corresponding to the moving block 170 and may include a first depressed portion 151 where the fixing piece 175 for pressing the peripheral portion of the moving block 170 is disposed And a second depression 152 on which the moving block 170 is seated. That is, the first stepped portion 171 of the moving block 170 is positioned in the first recessed portion 151, the second stepped portion 172 is positioned in the second recessed portion 152, and the second recessed portion ( The fixing piece 175 disposed in the 152 is fixed while pressing the first step portion 171.

The fixing piece 175 may be provided as a circular plate having a through hole (H3), it may be fixed to the lower sub-panel 150 by a coupling member including a rivet (176). In addition, the upper end of the fixing piece 175 disposed in the second depression 152 and the second step portion 172 of the moving block 170 may be located on the same plane.

Coupling portion 180 includes a stud bolt 181, a washer 182 and a nut 183. The stud bolt 181 is coupled to the coupling hole (H2) of the moving block 170. The washer 182 is coupled to the stud bolt 181 similarly to the spacer 190 to be described later, and is disposed on the spacer 190 so that the periphery is in contact with the top of the upper auxiliary panel 120. The nut 183 is disposed above the washer 182 and is fastened (coupled) to the stud bolt 181 to apply a predetermined pressure to the washer 182.

The spacer 190 is disposed above the moving block 170 to support the washer 182 and to maintain a predetermined gap between the washer 182 and the moving block 170. This allows the block 70 to perform the sliding movement effectively in accordance with the thermal deformation of the main secondary barrier 140. The spacer 190 may be provided, for example, in a cylindrical shape through which the central portion passes. The width of the spacer 190 may be smaller than the second stepped portion 172, and the height of the spacer 190 may be disposed on the same plane as the upper end of the upper auxiliary panel 120 when the spacer 190 is disposed above the moving block 170. It can be manufactured to be located.

4 is a plan view showing the stud bolt fixed to the moving block of the thermal stress reduction unit shown in Figure 2 exposed through the through hole of the secondary barrier. 5 is a cross-sectional view illustrating a state in which a periphery of the through hole of the secondary barrier illustrated in FIG. 4 and a joint surface of the fixing piece are joined by welding.

2 and 4, the upper surface of the moving block 170 is joined to the periphery of the through-hole H1 of the main secondary barrier 140 by welding W1 to contract the expansion of the main secondary barrier 140. Move along. In addition, the stud bolts 81 fixed to the moving block 170 also move accordingly. When the through hole H1 and the moving block 170 of the primary secondary barrier 140 are provided in a circular shape corresponding to each other, the circular welding may be performed by an automatic welding device. That is, the fixing jig is installed in a state in which the stud bolt 81 fixed to the moving block 170 is positioned at the center of the through hole H1 of the main secondary barrier 140, and the automatic welding device is mounted on the fixing jig. Welding can be performed.

4 and 5, the stud bolt 91 located in the through hole H1 formed in the central portion of the main secondary barrier 140 may be fixed to the lower fixing piece 175a. Can be. In this case, the periphery of the through hole H1 of the main secondary barrier 140 may be joined by the fixing piece 175a and the welding W2. The fixing piece 175a may be provided as a circular plate, and is fixed to the third seating groove S3 of the lower auxiliary panel 150 to be fixed by a coupling member including a rivet 176.

6 is a cross-sectional view illustrating a form in which a connection board is interposed between the upper insulation boards in the cargo hold barrier structure illustrated in FIG. 1. And, Figure 7 is a cross-sectional view showing a form in which the first seating groove and the weld damage prevention groove is formed in the lower auxiliary panel in the cargo hold barrier structure shown in FIG.

Meanwhile, referring to FIGS. 4, 6, and 7, in the embodiment of the present invention, the moving block 170 and the main secondary barrier 140 are disposed in the state in which the main secondary barrier 140 is accurately disposed at a predetermined position. In order to efficiently perform the welding operation between the fixing piece 175a and the main secondary barrier 140, the lower auxiliary panel 150 forms a first seating groove S1 on which the main secondary barrier 140 is seated. do. The first seating groove S1 may be formed to correspond to the shape and size of the main secondary barrier 140. If, when the first mounting groove (S1) is not formed when the welding operation between the moving block 170 and the main secondary barrier 140, the fixed piece 175 and the main secondary barrier 140 is performed In the following, a marking operation for fixing the main secondary barrier 140 at a predetermined position should be performed so that an accurate welding operation can be performed prior to the welding operation. This is because even if the main secondary barrier 140 is positioned at the set position, the possibility of leaving the spot during the welding operation is high.

Therefore, since the first mounting groove (S1) is formed in the lower auxiliary panel 150, and the welding operation is performed in a state in which the primary secondary barrier 140 is seated in the first mounting groove (S1), a separate marking operation is performed. The welding operation can be efficiently performed at the correct position without this being performed.

In addition, in order to cover the space between the main secondary barrier 140, the secondary secondary barrier 140a is installed so that a part of both sides overlaps the upper surface of the main secondary barrier 140. The secondary secondary barrier 41 may be made of the same material as the primary secondary barrier 140. At this time, during the welding operation between the main secondary barrier 140 and the secondary secondary barrier 140a, damage may occur to the lower auxiliary panel 150 made of plywood material by the heat of welding. In order to prevent this, the lower auxiliary panel 150 may form a welding damage prevention groove S4 at a position corresponding to the welding portion of the main secondary barrier 140 and the auxiliary secondary barrier 140a.

Referring to FIG. 6, the connection board 200 is interposed between the upper insulation boards 110 at both sides, and the connection protection plate at the upper portion of the connection member 201 and the connection member 201 interposed between the upper insulation member 111. 202. The connection member 201 may be provided with the same material as the upper insulation member 111, and the connection protection plate 202 may be provided with the same material as the upper protection plate 112. Here, the connection auxiliary panel 120a provided with the same material as the upper auxiliary panel 120 is disposed below the connection board 200, and the connection auxiliary panel 120a may be integrally provided with the connection board 200. In addition, an absorption layer 130a formed of the same material as the impact absorbing layer 130 may be disposed between the connection auxiliary panel 120a and the auxiliary secondary barrier 41.

FIG. 8 is a cross-sectional view of a portion of the lower subsidiary panel of FIG. 7 in which a second seating groove is formed for seating of the movable block.

2, 4 and 8, as described above, the second mounting groove (S2) is formed in the lower sub-panel 150 may be the moving block 170 is seated. Here, the second seating groove S2 may include a first recessed part 151 and a second recessed part 152 formed in a stepped shape, and the first recessed part 151 may include the first recessed part of the movable block 170. The first step part 171 is positioned, and the second step part 152 is positioned with the second step part 172. As described above, the moving block 170 is seated in the second seating groove S2 and the main secondary barrier 140 is moved in the state in which the main seating barrier 140 is seated in the first seating groove S1. As the welding between the blocks 170 is performed, the main secondary barrier 140 may be prevented from being separated from the set position during the welding operation, and a more convenient and accurate welding operation may be performed.

FIG. 9 is a cross-sectional view of a portion of the lower auxiliary panel of FIG. 7 in which a third seating groove is formed for seating of the fixing piece.

2, 5 and 9, as described above, a third seating groove (S3) is formed in the lower sub-panel 150 to secure the fixing piece (175a) to which the stud bolts 91 are fixed. Can be. As described above, the fixing piece 175a is seated in the third seating groove S3 and the main secondary barrier 140 is fixed in the state in which the main secondary barrier 140 is seated in the first seating groove S1. By performing the welding between the pieces 175a, a more convenient and accurate welding operation can be performed.

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.

17: primary barrier 110: upper insulation board
120: upper auxiliary panel 130: shock absorbing layer
140: secondary barrier 140a: secondary secondary barrier
150: lower auxiliary panel 160: lower insulation board
170: moving block 175,175a: fixed piece
S1 ~ S3: Mounting groove S4: Welding damage prevention groove

Claims (6)

An upper insulation board provided between the primary barrier and the primary secondary barrier;
Lower insulation board is fixed to the upper inner wall of the cargo hold; And
And a lower auxiliary panel interposed between the upper insulation board and the lower insulation board and having a first seating groove formed on an upper surface thereof so that the main secondary barrier is seated. The method of claim 1,
And further comprising secondary secondary barriers welded to each other so that both sides of the upper side of the primary secondary barrier overlap each other to cover a space between the primary secondary barriers.
The lower subpanel has a cargo hold barrier structure in which a weld damage prevention groove is formed at a position corresponding to a welded portion between the main secondary barrier and the secondary secondary barrier. The method of claim 1,
At least a portion of the upper periphery further comprises a moving block welded to the main secondary barrier so as to be moved in the contracted expansion direction of the main secondary barrier,
Wherein the lower sub-panel has a second seating groove on which the moving block is seated. The method of claim 3,
The moving block is provided in a shape having a step, the second seating groove and the first recessed portion is fixed to the fixing piece for pressing the moving block;
A cargo hold barrier structure comprising a second recess in which the movable block is seated. The method of claim 1,
The lower subpanel has a cargo hold barrier structure having a third seating groove in which a fixing piece for fixing the stud bolts is seated so that the stud bolt is fixed to a through hole formed in a central portion of the main secondary barrier. The method according to any one of claims 1 to 5,
An upper auxiliary panel disposed below the upper insulation board;
A cargo hold barrier structure further comprising a shock absorbing layer interposed between the upper auxiliary panel and the primary secondary barrier.

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