KR101487674B1 - 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 a lower insulation board provided between a cargo hold inner wall and a main secondary barrier; And a top insulating board provided between the main secondary barrier and the primary barrier, wherein the bottom insulating board is provided in a shape having a step, and the main secondary barrier is provided with an inclined surface at a position where the step is formed.

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 (e.g., LNG) 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 secondary barrier includes a primary secondary barrier and an auxiliary secondary barrier.

The process of installing the barrier of a cargo hold typically comprises fixing a plurality of lower heat insulating boards having the same thickness on the inner wall of the cargo hold, installing a main secondary barrier on the upper part of the lower insulating board, As shown in FIG. At this time, the auxiliary secondary barrier is installed so as to cover the space between the main secondary walls in a state where the heat insulating boards integrally formed with the lower insulating board, the main secondary barrier, and the upper insulating board are disposed adjacent to each other on the inner wall of the cargo hold, After the connection board is installed between the insulation boards, a primary barrier can be installed on 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) . At this time, contraction expansion occurs in the secondary barrier due to thermal stress, which may weaken the durability of the cargo barrier wall.

Conventionally, a curved wrinkle portion is formed in an auxiliary secondary barrier covering a space between the primary secondary walls disposed on the upper portion of the lower heat insulating board so as to expand and shrink by thermal stress, thereby reducing thermal stress.

In this regard, Korean Patent Laid-Open Publication No. 2012-0117544 (published on October 24, 2012) discloses a technique relating to a heat insulating structure of a cargo hold including a connecting member having a wrinkle portion. Here, the connecting member corresponds to the secondary secondary barrier described above.

Korea Open Patent No. 2012-0117544 (Opened on 24th, 2012)

An embodiment of the present invention is to provide a cargo barrier structure capable of effectively reducing thermal stress due to cryogenic fluid in a cargo hold.

It is another object of the present invention to provide a cargo hold wall structure capable of effectively reducing thermal stress due to cryogenic fluid in a cargo hold through an auxiliary secondary barrier in the form of a flat plate and inclined surfaces of the primary secondary barrier connected to both sides of the auxiliary secondary barrier.

According to one aspect of the present invention, a lower insulation board provided between an inner wall of a cargo hold and a main secondary barrier; And an upper insulating board provided between the main secondary barrier and the primary barrier, wherein the lower insulating board is provided in a shape having a step, and the main secondary barrier has a slope at a portion where the step is formed A cargo hold barrier structure may be provided.

And an auxiliary secondary barrier welded to the upper surface of the adjacent main secondary barrier to cover the space between the adjacent main secondary barriers so that both side surfaces overlap each other.

The secondary secondary barrier may be arranged in a crossed shape in an intersecting space formed by the arrangement of the lower insulating boards to connect the other secondary secondary walls to each other.

The lower insulation board may form a welding damage preventing groove at a corresponding position on the weld between the primary secondary barrier and the secondary secondary barrier.

The lower heat insulating board includes a lower protective plate attached to the upper portion of the inner wall of the cargo hold, a lower thermal insulating member disposed on the upper protective plate, a first upper auxiliary panel disposed on the upper portion of the lower thermal insulating member, And a second upper sub-panel disposed between the impact absorbing layer and the primary secondary barrier, wherein the lower protective panel, the lower heat-insulating member, and the first upper sub-panel have the same first width And the impact absorbing layer and the second upper sub-panel may be provided at the same second width smaller than the first width.

The cargo barrier structure according to the embodiment of the present invention can effectively reduce the thermal stress due to the cryogenic fluid in the cargo hold.

In addition, the thermal stress due to the cryogenic fluid in the cargo hold can be effectively reduced through the flat auxiliary plate-shaped auxiliary secondary barrier and the inclined surfaces of the primary secondary barrier connected to both sides of the auxiliary secondary barrier.

In addition, welding damage preventing grooves are formed on the lower heat insulating board at positions corresponding to the welds of the primary secondary barrier and the secondary secondary barrier, so that during the welding operation between the primary secondary barrier and the secondary secondary barrier, It is possible to prevent the occurrence of damage to the substrate.

Also, since the same secondary secondary barrier is used in the space between the primary secondary barrier and the crossed space formed by the arrangement of the lower insulating boards, automatic welding can be easily performed.

In addition, a lower insulation board is manufactured by stacking a lower protection plate, a lower insulation member, a first upper auxiliary panel, an impact absorbing layer, and a second upper auxiliary panel, The auxiliary panel may be made of a plywood material, and the lower heat insulating member and the impact absorbing layer may be made of the same or different kinds of foam materials to enhance the heat insulating effect.

1 is a sectional view of a barrier structure of a vessel cargo hold according to an embodiment of the present invention.
2 is a perspective view of the lower insulation board shown in Fig.
3 is an enlarged cross-sectional view of a primary secondary barrier disposed on top of the lower insulating board shown in FIG. 1 and an auxiliary secondary barrier covering the space between the primary secondary barrier and welded to the primary secondary barrier will be.
FIG. 4 shows the form of the secondary secondary barrier shown in 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.

1, a barrier structure of a vessel cargo hold that stores a cryogenic fluid (e.g., liquefied natural gas (LNG)) in accordance with an embodiment of the present invention includes a cargo hold structure constructed and arranged between a cargo hold inner wall 12 and a main secondary barrier 121 A lower insulation board 110 and an upper insulation board 130 provided between the primary barrier 140 and the primary secondary barrier 121.

1 and 2, the lower insulation board 110 includes a lower protection plate 111, a lower insulation member 112, a first upper sub-panel 113, an impact absorbing layer 114, a second upper sub- 115).

The lower protection plate 111 can be fixed to the inner wall 12 of the cargo hold by a mastic 3, a stud bolt (not shown) or the like. The lower protection plate 111 may be made of a material such as plywood.

The lower heat insulating member 112 is disposed on the lower protective plate 111 and is made of polyurethane foam (PUF), reinforced polyurethane foam (RPUF, Reinforced PUF) or the like to protect the hull from the cryogenic fluid can do. The lower heat insulating member 112 may be bonded to the upper portion of the lower protective plate 111 by an adhesive (e.g., glue or the like). A filling member 6 such as a glass wool may be inserted and filled in the space between the lower heat insulating members 112 to maintain the heat insulating performance.

The first upper sub-panel 113 is disposed on the lower heat insulating member 112 and may be made of a material such as plywood. The first upper auxiliary panel 113 may form the welding damage prevention groove H1 longitudinally and laterally at a position where welding between the primary secondary barrier 121 and the secondary secondary barrier 122 is performed. The welding damage preventing groove H1 is provided to prevent damage to the first upper auxiliary panel 113 made of a plywood material at the time of welding work.

The shock absorbing layer 114 may be disposed on the first upper sub-panel 113 and may be formed of the same or different foam material as the lower heat-insulating member 112. The shock absorbing layer 114 protects the cargo barrier from sloshing shock by the liquefied gas stored in the cargo hold. The shock absorbing layer 114 may be made of, for example, a 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 thereto, and the shock absorbing layer 114 may be made of various materials capable of protecting the cargo barrier wall from the sloshing shock caused by the liquefied gas stored in the cargo hold.

The second upper auxiliary panel 115 is disposed between the impact absorbing layer 114 and the primary secondary barrier 121 and may be made of a material such as plywood.

The lower insulating board 110 may be provided in a shape having a step difference. To this end, the lower protective plate 111, the lower heat insulating member 112, and the first upper sub-panel 113 may be provided with the same first width. The shock absorbing layer 114 and the second upper sub-panel 115 may be disposed on the lower heat-insulating board 110 with a second width equal to or smaller than the first width.

1 and 3, the main secondary barrier 121 is provided to cover at least a part of the welding damage preventing groove H1 from the upper surface of the second upper auxiliary panel 115. The first upper auxiliary panel 113 As shown in FIG. The main secondary barrier 121 has an inclined surface 121a at the stepped portion described above. That is, the remaining portion of the primary secondary barrier 121 except for the inclined surface 121a can be made flat.

In order to cover the space between the main secondary walls 121, an auxiliary secondary barrier 122 is installed on the upper surface of the primary secondary barrier 121 so that a part of the side walls overlap each other. At this time, during the welding operation between the primary secondary barrier 121 and the secondary secondary barrier 122, the first upper auxiliary panel 113 made of plywood may be damaged by the welding heat. In order to prevent this, as described above, the welding damage preventing groove H1 is formed at a position corresponding to the welding portion between the primary secondary barrier 121 and the secondary secondary barrier 122, It is possible to prevent the auxiliary panel 113 from being damaged.

3 and 4A, the auxiliary secondary barrier 122 is provided in a flat plate shape and can be welded to the primary secondary barrier 121. Conventionally, a curved portion (also referred to as corrugation) in a curved shape is formed in the auxiliary secondary barrier to reduce thermal stress. However, in the embodiment of the present invention, since the main secondary barrier 121 has the inclined surface 121a, even if the auxiliary secondary barrier 122 bonded to the primary secondary barrier 121 is provided in a flat plate shape, Expansion can be made to reduce thermal stress. That is, the auxiliary secondary barrier 122 and the inclined surfaces 121a of the primary secondary barrier 121 connected to both sides of the auxiliary secondary barrier 122 have a U-shape and have the same role as the conventional wrinkle portion . The inclined surface 121a may be provided in a form including at least one flat or corrugated wrinkle.

4 (b), the auxiliary secondary walls 122 may be arranged in a cross shape in an intersecting space formed by the arrangement of the lower heat insulating boards 110. [ Automatic welding can be easily performed since the same auxiliary secondary wall 122 is used between the main secondary barrier 121 and the intersecting space formed by the arrangement between the lower insulating boards 110 through this. Conventionally, however, a separate joint barrier is required to connect the secondary secondary walls to each other. At this time, the joint barriers and the auxiliary secondary barriers have different shapes, and therefore, it is difficult to automatically weld them. This conventional problem can be solved through the embodiment of the present invention.

1, an upper insulating board 130 is provided between a primary secondary wall 121 and a primary barrier 140, and includes an upper insulating member 131 and an upper protective plate 132. The upper heat insulating member 131 is made of a polyurethane foam (PUF), a reinforced polyurethane foam (RPUF, Reinforced PUF) or the like to protect the hull from a fluid at a cryogenic temperature. The upper protection plate 132 may be made of a material such as plywood.

A connection board 150 is interposed between the upper insulation boards 130. The connection board 150 includes a connection member 151 interposed between the upper insulation members 131 and a connection protection board 152). The connection member 151 may be made of the same material as the upper heat insulating member 131 and the connection protecting plate 152 may be made of the same material as the upper protecting plate 132.

Meanwhile, the primary barrier 140 may be made of a metal material such as stainless steel (SUS) or the like, and may be installed on the upper insulating board 130 in various known forms and methods. do.

The secondary barrier 120 (121, 122) may be formed of a plurality of sheets made of a metal material such as stainless steel, aluminum, brass or zinc. As another example, a composite sheet composed of a metal sheet and a fiber reinforced composite material may be used.

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.

110: lower insulation board 111: lower protection board
112: lower heat insulating member 113: first upper auxiliary panel
114: shock absorbing layer 115: second upper auxiliary panel
120, 121, 122: Secondary barrier 120a:
130: upper insulation board 140: primary barrier
150: Connection board H1: Prevent welding damage

Claims (5)

A lower insulation board provided between the cargo hold inner wall and the main secondary barrier; And
And an upper insulating board disposed between the primary secondary barrier and the primary barrier,
Wherein the lower heat-insulating board is provided in a shape having a step,
Wherein the main secondary barrier is provided with an inclined surface at the stepped portion,
The lower insulation board
A lower protection plate attached to the upper portion of the inner wall of the cargo hold,
A lower heat insulating member disposed above the lower protecting plate,
A first upper auxiliary panel disposed above the lower heat insulating member,
An impact absorbing layer disposed above the first upper sub-panel,
And a second upper sub-panel disposed between the impact absorbing layer and the primary secondary barrier. The method according to claim 1,
Further comprising an auxiliary secondary barrier welded to the upper surface of the adjacent primary secondary barrier to cover a space between the adjacent primary secondary barriers. 3. The method of claim 2,
Wherein the secondary secondary barrier is cross-shaped in an intersecting space formed by the arrangement of the lower insulating boards to connect the other secondary secondary walls to each other. The method according to claim 1,
Wherein the lower insulation board has a welding damage preventing groove formed at a position corresponding to the weld between the primary secondary barrier and the secondary secondary barrier. The method according to claim 1,
Wherein the lower protection plate, the lower thermal insulation member and the first upper sub-panel are provided at the same first width and the shock absorbing layer and the second upper sub-panel are provided at the same second width, .

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