KR101940261B1 - 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, which is provided between a primary barrier and a secondary barrier, in which a first sub panel, a first heat insulating member and a first protective plate are sequentially stacked; A lower insulating board disposed between the inner wall of the hull and the secondary barrier, wherein the second insulating plate, the second insulating member, and the second auxiliary panel are sequentially stacked; A fixing piece disposed at a depression of the second sub-panel; A stud bolt coupled to the first sub-panel and the fixing piece; A ball washer fastened to the stud bolt; And a nut fastened to the stud bolt and tightened so as to apply a force to the ball washer, wherein a ball in contact with the first sub-panel is inserted into a plurality of coupling grooves formed in the ball washer.

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 comprises fixing a plurality of lower heat-insulating boards on the inner wall of the hull, installing a secondary barrier on the lower heat-insulating board, and installing an upper insulating board and a primary barrier on the secondary barrier . At this time, in a state where the lower heat insulating board, the secondary barrier, and the upper heat insulating board are coupled to the inner wall of the hull adjacent to each other adjacent to each other, the space between the upper part of the main secondary barrier 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) .

At this time, a washer is fastened to the stud bolts coupled to the upper and lower heat insulating boards, and then the nut is fastened to the stud bolts to tighten the washer so as to apply the force.

Thus, when the shrinkage displacement is caused by the cryogenic fluid, the upper auxiliary panel may be damaged by the nut because the washer is tightened by the nut in contact with the upper sub-panel of the upper sub-panel of the upper sub-panel.

In this connection, please refer to Korean Patent Publication No. 10-2016-0033818 (published on Mar. 29, 2016).

Korean Patent Publication No. 10-2016-0033818 (published on Mar. 29, 2016)

An embodiment of the present invention is to provide a cargo hold barriers structure capable of enhancing the performance of a barrier structure by preventing the auxiliary panel included in the upper heat insulating board from being damaged by a fastening member coupled to a stud bolt.

According to an aspect of the present invention, there is provided an upper insulating board, which is provided between a primary barrier and a secondary barrier, in which a first sub-panel, a first insulating member, and a first protecting plate are sequentially stacked; A lower insulation board disposed between the inner wall of the hull and the secondary barrier and having a second protection plate, a second insulation member, and a second sub-panel sequentially stacked; A fixing piece disposed at a depression of the second sub-panel; A stud bolt coupled to the first sub-panel and the fixing piece; A ball washer fastened to the stud bolt; And a nut fastened to the stud bolt and tightened so as to apply a force to the ball washer, wherein a plurality of coupling grooves formed in the ball washer are provided with a cargo barrier structure in which a ball in contact with the first sub- .

The ball washer includes a first ball washer having a first coupling groove formed in a penetrating shape to which the ball is coupled, a second ball washer coupled to the upper portion of the ball protruding from the first groove, And a second ball washer which forms a second defect groove at the lower end and transmits a force applied by the nut.

And an impact absorbing layer provided between the first sub-panel and the secondary barrier.

The hold structure according to an embodiment of the present invention can improve the performance of the barrier structure by preventing the auxiliary panel included in the upper heat insulating board from being damaged by the fastening member coupled to the stud bolt.

FIG. 1 is a cross-sectional view illustrating a barrier structure of a vessel cargo hold according to an embodiment of the present invention.
2 is an enlarged cross-sectional view of part A shown in Fig.
FIG. 3 is an enlarged cross-sectional view of the stud bolt of FIG. 2 in a state in which a ball washer is inserted into the stud bolt.
4 is a cross-sectional view showing another example of the ball washer 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.

1 to 3, 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 an upper insulation board 110, a lower insulation board 120, A fixing piece 130, a stud bolt 140, a ball washer 150, and a nut 160. [

The upper insulation board 110 is provided between the primary barrier 10 and the secondary barrier 20 and the first auxiliary panel 111 and the first insulation member 112 and the first protection plate 113 are sequentially Stacked structure.

The first sub-panel 111 and the first protection plate 113 may be made of a material such as plywood.

The first heat insulating member 112 may be made of a polyurethane foam (PUF), a reinforced polyurethane foam (R-PUF), or the like to protect the hull from the cryogenic fluid.

The primary barrier 10 is made of a metal material such as stainless steel (SUS) or the like, and may be installed on the upper insulating board 110 in various known forms and ways, and thus a detailed description thereof will be omitted. The secondary barrier 20 may be composed of a composite sheet composed of a metal sheet and a fiber-reinforced composite material.

Here, a strip member 40 may be interposed between the upper insulating board 110 and the primary barrier 10. The strip member 40 is disposed in a groove-shaped engagement region formed in the first protection plate 113 of the upper heat insulation board 110 movably in accordance with the contraction expansion of the primary barrier 10.

The primary barrier 10 is welded to the upper portion of the strip member 40 and the strip member 40 moves according to the movement of the primary barrier 10 which expands and contracts due to thermal stress. This can alleviate the thermal stress and improve the durability of the cargo barrier walls.

As another example, the primary barrier 10 may be installed in such a manner as to press the upper portion of the strip member 40 such that the strip member 40 moves together with the contraction expansion of the primary barrier 10. The strip member 40 may be made of, for example, stainless steel or the like.

The lower insulation board 120 is disposed between the inner wall 30 of the hull and the secondary barrier 20 and the second protection plate 121 and the second insulation member 122 and the second sub panel 123 are sequentially stacked .

The second protection plate 121 and the second sub-panel 123 may be made of a material such as plywood.

The second heat insulating member 122 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.

A filling member 60 such as a glass wool may be inserted and filled in the space between the lower heat insulating members 120 to maintain the heat insulating performance.

The fixing member 130 is disposed in the depression 123a of the second sub-panel 123. [ The fixing piece 130 may be provided as a circular plate having a groove 130a to which the stud bolt 140 is coupled.

The fixing member 130 is fixed to the depressed portion 123a of the second sub-panel 123 by an engaging member including a rivet R or the like coupled to the second sub-panel 123 and the second heat- As shown in FIG.

 The stud bolt 140 is coupled to the first sub-panel 111 and the fixing piece 130. The lower portion of the stud bolt 140 is coupled to the groove 130a of the fixing piece 130 and the stud bolts 140 facilitate the mechanical coupling between the upper and lower heat insulating boards 110 and 120 .

The ball washers 150 are fastened to the stud bolts 140 and the nuts 160 are fastened to the stud bolts 140 and tightened to apply force to the ball washers 150.

3, a ball B is inserted into a plurality of coupling grooves H formed in the ball washer 150 so as to be in contact with the first sub-panel 111. As shown in FIG. The ball B can reduce the friction between the ball washer 150 and the first sub-panel 111. [

Accordingly, when the shrinkage displacement occurs at the cryogenic temperature condition, the horizontal load acting on the stud bolt 140 can be reduced, and the stud bolt 140 can be made to receive mainly the vertical load.

The stud bolt 140 is weak against a horizontal load and strong against a vertical load, thereby eliminating the problem that the stud bolt 140 is bent by a horizontal load conventionally. In addition, friction between the ball washer 150 and the first sub-panel 111 can be reduced, thereby preventing the first sub-panel 111 from being damaged and enhancing the performance of the overall cargo hold barrier structure.

Referring to FIG. 4, as another example, the ball washers 150 described above may be provided in a detachable and engageable form. To this end, the ball washer 150 includes a first ball washer 151 formed with a first defect groove H1 in a penetrating shape to which the ball B is coupled, a second ball washer 151 coupled to the first ball washer 151, A second ball washer 152 for transmitting a force applied by the nut 160 is formed by forming a second defect groove H2 to be coupled to an upper portion of the ball B projected from the first defect groove H1, . ≪ / RTI >

Meanwhile, an impact absorbing layer 170 may be provided between the first sub-panel 111 and the secondary barrier 20. The shock absorbing layer 170 can protect the cargo hold barrier from sloshing shock caused by liquefied gas stored in the cargo hold.

The shock absorbing layer 170 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, it is not so limited, and the shock absorbing layer 170 may be made of various materials that can protect the cargo barrier from sloshing shocks caused by the liquefied gas stored within the cargo hold.

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: primary barrier 20: secondary barrier
30: inner wall of hull 40: strip member
110: upper insulating board 111: first auxiliary panel
112: first heat insulating member 113: first shield plate
120: lower insulation board 121: second protection board
122: second heat insulating member 123: second auxiliary panel
130: Fixing piece 140: Stud bolt
150: Ball washers 160: Nuts

Claims (3)

An upper insulating board provided between the primary barrier and the secondary barrier, the upper insulating board having a first sub-panel, a first insulating member, and a first protecting plate sequentially stacked;
A lower insulation board disposed between the inner wall of the hull and the secondary barrier and having a second protection plate, a second insulation member, and a second sub-panel sequentially stacked;
A fixing piece disposed at a depression of the second sub-panel;
A stud bolt coupled to the first sub-panel and the fixing piece;
A ball washer fastened to the stud bolt and disposed at an upper end of the first sub-panel; And
And a nut fastened to the stud bolt and tightened so as to apply force to the ball washer,
Wherein a ball contacting the upper end of the first sub-panel is inserted into a plurality of coupling grooves formed at a lower portion of the ball washer, and when a shrink displacement occurs at a cryogenic temperature condition, a horizontal load acting on the stud bolt, 1 Cargo barrier structure to reduce friction between sub-panels. The method according to claim 1,
Wherein the ball washer includes a first ball washer having a first coupling groove of a penetrating shape to which the ball is coupled,
A second ball washer coupled to the first ball washer and having a second defect groove formed at a lower end thereof coupled to an upper portion of the ball protruding from the first defect groove and transmitting a force applied by the nut; The cargo hold barrier structure. The method according to claim 1,
And a shock absorbing layer provided between the first sub-panel and the secondary barrier.

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