KR101617026B1 - Cargo for liquefied gas - Google Patents

Abstract

Disclosed is a liquefied natural gas holding window for reinforcing a barrier wrinkle and a barrier reinforcing member used therefor. A liquefied natural gas storage window according to an embodiment of the present invention includes an outer wall for supporting a load of a storage fluid, a thermal insulation panel structure for insulating the storage fluid from the outside, and a barrier for sealing a storage space in which the storage fluid is received, And a barrier reinforcement member provided on the outside of the barrier wrinkle portion to prevent the barrier wrinkle portion from being deformed by the impact of the storage fluid, wherein the barrier reinforcement member is configured to receive the barrier wrinkle portion And a reinforcing wrinkle portion bent toward the storage space.

Description

{CARGO FOR LIQUEFIED GAS}

The present invention relates to a liquefied gas hold, and more particularly to a liquefied gas hold that includes a barrier of different thickness.

The liquefied gas is a gas which is cooled or compressed to be made into a liquid. For convenience of transportation, the gas which is gas at room temperature is used as a liquid. One of the important uses in liquefied gas is liquefied natural gas. Liquefied natural gas refers to a colorless transparent cryogenic liquid that reduces methane-based natural gas to -162 ° C and reduces its volume by one-sixth.

As such liquefied natural gas is used as an energy source, an efficient transportation method that can transport the gas from the production base to the purchase site of the customer site has been examined in order to use this gas as energy. As a result of this effort, a large amount of liquefied gas A liquefied gas transport vessel capable of transporting liquefied natural gas to the sea was developed.

However, the liquefied gas transportation vessel is required to have a cargo that can store and store the liquefied gas liquefied at an extremely low temperature.

That is, since the liquefied natural gas has a higher vapor pressure than the atmospheric pressure and has a boiling temperature of about -162 ° C, in order to safely store and store such liquefied natural gas, For example, it should be made of aluminum steel, stainless steel, 35% nickel steel, etc. It should be designed with a unique insulation panel structure which is resistant to thermal stress and heat shrinkage and prevents heat penetration. The cargo hold of such a liquefied gas transportation vessel can be classified into a self-supporting type and a membrane type depending on its structure.

If the liquefied gas leaks to the inside of the heat insulating panel, it may cause damage to the cargo window due to rapid volume expansion due to temperature increase. Thus, a membrane barrier is provided to seal the liquefied gas inside the cargo hold. Membrane barrier should be designed considering thermal stress and sloshing impact.

Korean Patent Laid-Open Publication No. 10-2012-0013233 (Feb. 14, 2012) discloses a liquefied natural gas storage tank and a manufacturing method thereof.

Korean Published Patent Application No. 10-2012-0013233 (2012.02.14.)

An embodiment of the present invention is intended to provide a liquefied gas holding window capable of preventing the barrier wrinkle portion from being deformed by the impact of the storage fluid.

Further, it is an object of the present invention to provide a liquefied gas holding window with improved fatigue life.

According to an aspect of the present invention, there is provided an air conditioner comprising a barrier surrounding an accommodating space of a liquefied gas, and an insulating panel assembly surrounding the barrier and insulating the liquefied gas from the outside, the barrier including a pleat protruding toward the accommodating space And the barrier sheet is installed in a plurality of areas divided on the basis of the sloshing load distribution of the liquid cargo received in the cargo hold, and the barrier sheet is installed in the partitioned area The barrier sheet may be provided with a liquefied gas holding window having a different thickness.

The pleats may include a plurality of pleats arranged side by side and a thicker barrier sheet of the barrier sheet may be provided with a liquefied gas hold window having a narrower spacing between adjacent pleats than a thinner barrier sheet.

The barrier sheets having different thicknesses may be provided with liquefied gas holders which are connected in a state where a part of the edges are overlapped with each other.

The lid of the barrier sheet inserted downward of the overlapping barrier sheet may be provided with a liquefied gas holding window inserted and welded into the wrinkle portion of the barrier sheet to be covered.

The first barrier sheet as the thinner barrier sheet and the second barrier sheet as the thicker barrier sheet among the barrier sheets of the different thicknesses connected to each other are connected so that the second barrier sheet is upward in a state where a part of the edge is overlapped with each other, Wherein a distance between the adjacent wrinkles of the first barrier sheet is larger than an interval between the adjacent wrinkles of the second barrier sheet by an integral multiple of the distance between the adjacent wrinkles of the first barrier sheet, Wherein the folded portion of the end sheet is connected to a corrugation portion which is not connected to the corrugation portion of the first barrier sheet, and the corrugated portion of the end portion sheet is connected to the corrugated portion of the first barrier sheet, A liquefied gas holding window where wrinkling is terminated can be provided.

The lid of the overlapping barrier sheet may be provided with a liquefied gas holding window so as to correspond to the thickness of the barrier sheet inserted downward of the overlapped barrier sheet.

The first barrier sheet as the thinner barrier sheet and the second barrier sheet as the thicker barrier sheet among the barrier sheets of the different thicknesses connected to each other are respectively formed on the opposite edges of the first barrier sheet And the second barrier sheet is connected to the second barrier sheet so that a part of the edge of the second barrier sheet overlaps the first barrier sheet, and the corrugation of the second barrier sheet is disposed to be offset from the corrugation of the first barrier sheet. .

Wherein the plurality of regions partitioned by the sloshing load distribution can be divided into a low-middle region and a high-load region, and the low-middle region is provided with a barrier sheet having a thickness in the range of 1.0 to 1.4 mm, A liquefied gas holding window using a barrier sheet having a thickness in the range of 2.0 mm may be provided.

The liquefied gas holding window according to the embodiment of the present invention can prevent the deformation of the barrier due to the sloshing impact by increasing the thickness of the barrier where the sloshing impact is large.

In addition, in the case of a thick walled wall, it is possible to improve the fatigue life by narrowing the interval between the corrugated portions.

Also, it is possible to minimize the increase in weight and price of the cargo hold by varying the thickness of the barrier depending on the sloshing impact.

In addition, two barriers having different thicknesses and wrinkles can be connected.

1 is a cross-sectional view showing the structure of a liquefied gas holding window.
2 is a perspective view showing the kitchen wall and its intersection.
3 is a perspective view illustrating a barrier according to an embodiment of the present invention.
4 is an exploded perspective view of FIG.
5 is an enlarged view of a portion V in Fig.
6 is a sectional view taken along the line AA in Fig.
7 is a sectional view taken along the line BB of Fig.
Figs. 8 and 9 are experimental results showing deformation of the wrinkle portion according to the thickness variation. Fig. 8 shows the result of symmetrical hydraulic operation, and Fig. 9 shows the result of asymmetric hydraulic operation.
10 is a perspective view showing a welded portion of a barrier wall according to another embodiment of the present invention.

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 and 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 is a cross-sectional view showing the structure of a liquefied gas holding window.

1, a cargo hold of a liquefied gas transportation vessel surrounds a space capable of accommodating liquefied gas and includes a main wall 10 in direct contact with the liquefied gas, a lid 10 surrounding the main wall 10, And an outer wall 30 that surrounds and firmly supports the heat insulating panel assembly 20. The heat insulating panel assembly 20 includes a plurality of heat dissipating panel assemblies 20,

The outer wall 30 supports the load of the storage fluid, and an inner hull can be used. The heat insulating panel assembly 20 generally has a double structure including an upper heat insulating panel 21 and a lower heat insulating panel 22 for the purpose of improving the heat insulating performance and facilitating the repairing. An auxiliary barrier 23 may be provided between the lower insulating panel 22 and the lower insulating panel 22. The heat insulating panels 21 and 22 are generally made of a material having excellent heat insulation performance and light weight such as polyurethane foam (PUF) or reinforced polyurethane foam (RPUF, Reinforced PUF) Can be protected.

The airtightness (or water tightness) is a top priority in the kitchen wall 10 and the auxiliary barrier 23 and metal materials such as an invar alloy (INVAR), stainless steel (SUS), or aluminum alloy can be used, A rigid triplex and a supple triplex may be used.

The kitchen wall 10 is for sealing the storage space in which the storage fluid is received, and airtightness is required. Since the liquefied gas can be maintained at a cryogenic temperature below the boiling point, it is usually stored in a liquid state. However, depending on the change of temperature or pressure, vaporization of some liquefied gas may occur. In this case, the pressure inside the cargo hold increases greatly. When the kitchen wall 10 penetrates due to such an increase in pressure or the like, the liquid or gaseous liquefied gas can be introduced into the heat insulating panel assembly 20. [ As the temperature of the introduced liquefied gas increases, the volume of the liquefied gas expands and damages the heat insulating panel assembly 20. The damage to the cargo holds a significant amount of time and money in repairs, so the airtightness of the barrier is considered very important.

The auxiliary barrier 23 is provided between the lower insulating panel 22 and the upper insulating panel 21 so that the lower insulating panel 22 can be protected even when the wall 10 is penetrated. Therefore, since only the upper insulating panel 21 needs to be repaired, the time and cost required for repairs can be greatly reduced.

The lower heat insulating panel 22 is adhered to the outer wall by a mastic 31 or the like so that the impact can be alleviated at the time of bonding and the stress can be reduced by giving the heat insulating panel assembly 20 room for deformation . Further, the lower heat insulating panel 22 can be joined by various fixing members including the outer wall 30, the stud bolts 32, and the like.

The reinforcing panel 24 may be provided on the upper and lower portions of the heat insulating panels 21 and 22. The reinforcing panel 24 reinforces the adiabatic panel. The reinforcing panel 24 can be formed of plywood or the like, and is adhered to the adiabatic panel using an adhesive such as an epoxy glue.

The reinforcing panel 24d provided between the lower insulating panel 22 and the outer wall 30 of the reinforcing panel 24 can firmly couple the outer wall 30 and the lower insulating panel 22 to each other. The reinforcing panels 24a, 24b and 24c provided between the barriers 10 and 23 and the heat insulating panels 21 and 22 are provided with fitting members (not shown) for firmly mounting the barriers 10 and 23 Thereby facilitating the installation of the barriers 10 and 23 and further firmly securing the barriers 10 and 23. Conventionally, the heat insulating panels 21 and 22 and the barriers 10 and 23 are bonded using an adhesive. In this case, adhesion failure is likely to occur due to thermal stress. Therefore, the fixing of the barriers 10, 23 can be made more rigid when bonding the insulating panels 21, 22 and the barriers 10, 23 by using welding or mechanical bonding, have. Therefore, the reinforcing panels 24a, 24b, 24c can be provided so as to be able to install the coupling members for welding or mechanical coupling.

2 is a perspective view showing the kitchen wall and its intersection.

The kitchen wall 10 may be formed by combining a plurality of barrier sheets, and welding may be used as a joining method in order to maintain airtightness. The kitchen wall 10 includes first and second barrier ribs 11 and 12 arranged in different directions in order to facilitate contraction or extension due to thermal deformation while maintaining airtightness, And may include additional crossing portions 13.

Although two vertically arranged barrier ribs 11 and 12 are shown in FIG. 2, they may include three or more barrier ribs as required. For example, the three-directional barrier ribs may be disposed at an angle of 60 degrees with respect to each other.

The kitchen wall (10) is exposed to the cryogenic liquefied gas and directly exposed to the temperature change of the storage space. As the heat shrinkage and thermal expansion of the kitchen wall are repeated, the fatigue accumulates and may be destroyed or the welded portion may be damaged when heat shrinkage occurs. Because of this problem, the barriers have a corrugation to have a low in-plane stiffness. The bending of the barrier reduces the thermal stress at the welded part by deforming a certain amount when heat shrinkage occurs.

The kitchen wall 10 includes a flat portion 10b and barrier ribs 11 and 12 and an intersection 13. The wrinkles 11 and 12 may protrude toward the storage space and may have a shape such as a quadratic curve or a cubic curve. A round portion 10c may be formed at the intersection of the wrinkles 11 and 12 and the flat portion 10b. The rounded portion 10c means that the corner where two faces in different directions meet is processed as a curved surface without a discontinuous point. By providing the round portion 10c, the barrier ribs 11 and 12 can be safe from fatigue failure even if the thermal deformation continues.

A space 10a may be provided between the imaginary extension surface of the flat surface portion 10b and the folds 11 and 12, that is, below the folds 11 and 12. This space 10a can be used as a flow path of the inspection gas capable of checking the airtightness of the barrier 30. In addition, the shock absorbing member and the reinforcing member can be inserted.

The thermal stress acting in the plane direction of the barrier 30 can be relieved by the wrinkles 11 and 12 in both directions. That is, since the corrugated portions 11 and 12 have a room for deformation in the width direction, they can cope with thermal stress. The thermal stress acting in the longitudinal direction of the first barrier ribs 11 is relieved by the stretchability of the second barrier ribs 12 and the thermal stress acting in the longitudinal direction of the second barrier ribs 12 Can be solved by the elasticity of the one-walled wrinkle portion (11).

As described above, the barrier ribs 11 and 12 are included to prevent the kitchen wall 10 from being fatigued by thermal stress. However, since the thermal stress as well as the sloshing impact of the liquid cargo are directly transmitted to the kitchen wall 10, deformation of the wall corrugations 11 and 12 may occur.

Sloshing is a phenomenon in which a liquid substance contained in a cargo hold flows when a ship or floating structure moves in various sea states. If there is liquid in only a part of the interior of the cargo hold, the wall and the ceiling of the cargo hold will be severely impacted by the sloshing caused by the flow of the liquid, which is called sloshing impact. Such a sloshing impact may cause damage to the heat insulating panel assembly 20 (see Fig. 1) of the cargo hold.

The sloshing phenomenon is necessarily caused by the dynamic movement of the ship during the operation of the ship, and the cargo hold is to be designed to have sufficient strength to withstand the load by sloshing. In particular, the corrugations 11 and 12 of the barrier wall are protruded in a shape bent toward the storage space and may be vulnerable to sloshing shock because the space 10a is formed therein. Therefore, a method of inserting a barrier reinforcing member (not shown) into the inner portion 10a of the barrier rib to protect the barrier ribs 11 and 12 from the sloshing impact has been suggested. However, when the barrier reinforcement member is inserted, there is a problem that the increase in weight is not only large but also the construction and repair costs increase.

FIG. 3 is a perspective view showing a barrier according to an embodiment of the present invention, and FIG. 4 is an exploded perspective view of FIG. 5 is an enlarged view of a portion V in Fig. 3, Fig. 6 is a cross-sectional view taken along line A-A in Fig. 5, and Fig. 7 is a cross-sectional view taken along a line B-B in Fig.

A barrier according to an embodiment of the present invention may be formed by connecting a plurality of barrier sheets. Adjacent barrier sheets 100 and 200 can be welded together with their edges overlapping. The reason for using welding is to secure airtightness (or watertightness) so as to prevent the liquefied gas from entering the heat insulating panel assembly 20 (see FIG. 1). The welding method may be various welding methods used in the related art, and includes lap welding or butt welding. In addition, laser welding may be used to improve the quality of the weld while reducing work variations to obtain a uniform quality. Overlap welding, butt welding, or laser welding is a technique well known in the related art, so a detailed description will be omitted.

The barrier sheet according to the embodiment of the present invention may have different thicknesses. For example, a 1.2 mm thick barrier sheet 100 and a 1.8 mm thick barrier sheet 200 can be used. Conventional liquefied gas holders typically use a 1.2 mm thick barrier sheet. The thicker the barrier sheet, the better the bending stiffness. On the contrary, the fatigue life is reduced. Also, the thicker the barrier sheet, the greater the weight of the cargo hold, the loss of the loading capacity, and the higher the manufacturing cost of the cargo hold. In order to compromise these conflicting requirements, a 1.2 mm thick barrier sheet was used, but deformation of the wrinkles of the barrier could occur in the high load region where the sloshing impact is high.

The relationship between the bending rigidity D and the thickness t of the barrier sheet is shown in the following equation where E is the elastic modulus and v is the poisson ratio.

[Equation 1]

Since E and v are physical properties depending on the material, the bending stiffness (D) is related to the change of the thickness (t), and the bending stiffness (D) is proportional to the cube of the thickness (t). That is, the bending stiffness D can be greatly increased due to a slight increase in thickness.

Figs. 8 and 9 are experimental results showing deformation of the wrinkle portion according to the thickness variation. Fig. 8 shows the result of symmetrical hydraulic operation, and Fig. 9 shows the result of asymmetric hydraulic operation.

In FIG. 8, when a barrier sheet having a thickness of 1.2 mm is used, the deformation is performed within an acceptable range up to a pressure of 12 bar. However, it can be seen that deformation at a pressure of 14 bar is large and permanent deformation occurs in the corrugation.

In particular, when the asymmetric hydraulic pressure acts as shown in FIG. 9, it can be seen that the degree of deformation is very large even at a pressure of 12 bar which is safe in symmetrical hydraulic operation. In contrast, the 1.8 mm thick barrier sheet, which only increased the thickness by 0.6 mm, shows little deformation in the symmetrical hydrostatic pressure as well as in the asymmetric hydrostatic pressure at a pressure of about 14 bar.

However, since the sloshing impact applied to the inner wall of the cargo hold varies depending on the position, in the case where all the walls are 1.8 mm thick, the weight, volume, and cost side There is a loss in.

The barriers of the cargo hold according to the embodiment of the present invention can be divided on the basis of the load distribution considering the size of the cargo hold, the weight of the cargo to be stored, and the mobility of the cargo. In the embodiment of the present invention, the partition sheet is partitioned into two parts, i.e., the low-load area and the high-load area. A barrier sheet 100 having a thickness of 1.2 mm is provided in the lowered area, A barrier sheet 200 of 1.8 mm thickness was used. However, if necessary, it can be divided into three or more compartments. In this case, it is possible to use barrier sheets of various thicknesses. Generally, the high-load region that receives a large amount of sloshing load includes a lower chamfer portion in contact with the bottom surface of the cargo hold, a vertical surface in contact with the lower chamfer surface, a top chamfer portion in contact with the ceiling surface and a ceiling surface, .

As the thickness of the barrier sheet increases, the bending stiffness increases to prevent deformation due to the sloshing impact, but the degree of stress concentration increases and the fatigue life can be reduced. The relationship between the concentration of the stress and the thickness of the material can be found from the following equation concerning the stress concentration factor (K).

&Quot; (2) "

The barriers include corrugations to reduce thermal stresses, and the corrugations include first direction corrugations 110 and 210 and second direction corrugations 120 and 220, which are provided in different directions, An intersection (or a knot) is formed by the corrugation. The intersection may include many bends to reduce the stress (see intersection 13 in FIG. 2). At this time, when the thickness of the barrier sheet is increased, the radius of curvature of the inner surface of the curved portion becomes smaller when the outer surface of the curved portion forms the same size, and the stress concentration coefficient K increases accordingly. Therefore, as the thickness of the barrier sheet increases, the stress concentrated on the bent portion increases, which results in shortening the fatigue life of the barrier sheet.

The barrier sheets 100 and 200 according to the embodiment of the present invention narrow the gap between the same directional wrinkles that are parallel to each other in order to maintain the fatigue life while increasing the thickness. The narrower the gap between the wrinkles, the more the wrinkles can be provided in the barrier sheet of the unit area, and the greater the number of the wrinkles, the smaller the degree of thermal deformation of the wrinkles covers. Therefore, the narrower the gap between the pleats, the less the stress concentrated on the flexure.

Hereinafter, the coupling of the barrier sheets 100 and 200 according to the embodiment of the present invention will be described with reference to the drawings. The barrier sheets 100 and 200 of the present invention include a first barrier sheet 100 and a second barrier sheet 200 having different thicknesses t1 and t2 from each other and the second barrier sheet 200 includes a first barrier sheet 100, Thicker than the sheet 100 (t2 > t1). For example, the thickness t1 of the first barrier sheet 100 may range from 1.0 mm to 1.4 mm, and the thickness t2 of the second barrier sheet 200 may range from 1.6 mm to 2.0 mm. The first barrier sheet 100 and the second barrier sheet 200 each include first directional folds 110 and 210 and second directional folds 120 and 220 intersecting the first directional folds 110 and 210, The gap between the corrugations 110 of the barrier sheet is wider than the gap between the corrugations 210 of the second barrier sheet. The spacing between the corrugations of the two barrier sheets 100 can be set at an optimum spacing according to the experiment and the spacing between the corrugations 110 of the first barrier sheet as shown in the figure is the same as the width of the corrugations of the second barrier sheet 100 210, the wrinkles 210-1 are formed alternately when the two barrier sheets 100 are connected to each other, so that the construction can be facilitated.

The first barrier sheet 100 and the second barrier sheet 200 may be welded while the edges of the first barrier sheet 100 and the second barrier sheet 200 are partially overlapped. At this time, since the interval of the wrinkles 210 of the second barrier sheet is narrower than the interval of the wrinkles 110 of the first barrier sheet, the second barrier sheet 200 covers the first barrier sheet 100 The corrugated portion 210 of the second barrier sheet may not interfere with the flat portion of the first barrier sheet 100. [ In the figure, the interval of the corrugations 210 of the second barrier sheet is half the interval of the corrugations 110 of the first barrier sheet, so that the corrugations 110 of the first barrier sheet and the corrugations 210- 1 and the portion of the first barrier sheet that does not have the wrinkle portion 110 corresponding to the wrinkle portion 210-2 of the second barrier sheet alternately appear. That is, the first corrugated sheet 210-1, which is a corrugated portion that meets with the first direction corrugated portion 110 of the first barrier sheet among the corrugations 210 of the second barrier sheet, And a second wrinkle portion 210-2 which is a wrinkle portion that does not meet with the portion 110. [

Next, the engaging portion will be described with reference to the cross-sectional view of Fig. The end of the second barrier sheet 200 may be formed with a step corresponding to the thickness t1 of the first barrier sheet 100 so that the edge of the first barrier sheet 100 can be inserted. It is possible to prevent the second barrier sheet 200 from falling off the reinforcing panel 24a at the engaging portion when the step is formed. The first barrier sheet 100 may be divided into an exposure unit 101 and an overlapping unit 102 based on an area where the second barrier sheet 200 overlaps. Similarly, the second barrier sheet 200 includes the exposed portion 201 and the overlap portion 203. Since the exposed portion 201 and the overlap portion 203 form stepped portions, the second barrier sheet 200 has a connecting portion 202 ). Although the shape of the connecting portion 202 is shown as an inclined plane in the drawing, it may be a stepped shape.

The edge of the first barrier sheet 100 is inserted below the second barrier sheet 200 while the edge of the second barrier sheet 200 is folded below the first barrier sheet 100 It is a matter of course that a step corresponding to the thickness t2 of the second barrier sheet 200 may be formed at the end of the first barrier sheet 100. [

The corrugated portion 110 of the first barrier sheet and the first corrugated portion 210-1 of the second barrier sheet are welded in a state where the edges are partially overlapped with each other. At this time, the corrugated portion 110 of the first barrier sheet is inserted into the first corrugated portion 210-1 of the second barrier sheet 200. The first corrugated part 210-1 may be manufactured to have a radius that is as large as the thickness t1 of the corrugated part 110 of the first barrier sheet, 1 can be enlarged to have a radius that is as large as the thickness t1 of the corrugated portion 110 of the barrier sheet. The first folding portion 210-1 of the second barrier sheet 200 is formed to be stepped at the coupling portion.

The corrugated portion 110 of the first barrier sheet can be divided into the exposed portion 111 and the overlapped portion 112 based on a region where the first corrugated portion 210-1 of the second barrier sheet 200 overlaps. Similarly, the corrugated portion 210 of the second barrier sheet includes the exposed portion 211 and the overlapped portion 213. Since the exposed portion 211 and the overlapping portion 213 form a stepped portion, And includes a connection portion 212. Although the shape of the connecting portion 212 is shown as an inclined plane in the drawing, the connecting portion 212 may be a stepped shape.

3 and 4, the processing of the second wrinkle portion 210-2, which is not connected to the wrinkle portion 110 of the first barrier sheet of the wrinkle portion 210 of the second barrier sheet, will be described . Since the barrier wall has the highest airtightness, the opening of the wrinkle portion can not be left exposed in the accommodation space. The second wrinkle part 210-2 which is not connected to the wrinkle part 110 of the first barrier sheet among the wrinkle parts 210 of the second barrier sheet is connected to the wrinkle part 310 of the end sheet and is terminated .

The end sheet (300) is provided to cover both the first barrier sheet (100) and the second barrier sheet (200). At this time, due to the overlapping welding at the boundary between the first barrier sheet 100 and the second barrier sheet 200, a difference in height is generated by the thickness t2 of the second barrier sheet 200, 300 form a step along the shape of the second barrier sheet 200 overlaid on the first barrier sheet 100. The corrugated portion 310 of the end sheet is connected to the corrugated portion 210 of the second barrier sheet at one end and ends in the closed curved surface at the other end.

Next, the manner in which the end portion sheet 300 is engaged will be described with reference to the sectional view of FIG. A step corresponding to the thickness t2 of the second barrier sheet 200 may be formed at the end of the end sheet 300 so that the edge of the second barrier sheet 200 can be inserted. The end portion sheet 300 includes the exposed portion 301 and the overlap portion 303 with respect to the overlapping region of the second barrier sheet 200 and the exposed portion 301 and the overlap portion 303 And the connection portion 302 connecting the two steps. Although the connecting portion 302 is formed in an inclined plane in the drawing, the connecting portion 302 may have a stepped shape. In addition, due to the shape of the connection portion 302, a space is formed between the first barrier sheet 100 and the second barrier sheet 200 and the end sheet 300. This space must be removed to prevent the airtightness of the barrier from being maintained. Accordingly, the shape of the connecting portion 202 may be formed in a stepped shape to prevent such a space from being formed, or this space may be filled with welding.

The corrugated portion 310 of the end sheet and the second corrugated portion 210-2 of the second barrier sheet 200 are welded in a state in which the edges are partially overlapped with each other. At this time, the second corrugated portion 210-2 is inserted into the corrugated portion 310 of the end portion sheet. The corrugated portion 310 of the end portion sheet may be manufactured to have a radius that is as large as the thickness t2 of the corrugated portion 210 of the second barrier sheet or the end portion of the corrugated portion 310 of the end portion sheet 2 can be enlarged to have a radius that is as large as the thickness t2 of the corrugated portion 210 of the barrier sheet. In the drawing, the rear end is shown, so that the corrugated portion 310 of the end sheet is formed to be stepped at the engagement portion.

The corrugated portion 310 of the end sheet includes an exposed portion 311 and an overlap portion 313 based on a region overlapping the second corrugated portion 210-2 and the exposed portion 311 and the overlap portion 313 The connecting portion 312 connecting the two steps. Although the connecting portion 312 has a slope in the drawing, the connecting portion 312 may have a stepped shape.

10 is a perspective view showing a welded portion of a barrier wall according to another embodiment of the present invention.

The first barrier sheet 100 and the third barrier sheet 400 are connected to each other and the gap between the corrugations 110 of the first barrier sheet and the gap between the corrugations 110 of the third barrier sheet, (410) is not an integral multiple. 3, the wrinkles 110 and 210 of the barrier sheets 100 and 200 connected to each other are not connected to each other or connected to each other, 100, and 400 are connected to each other, connected or not connected to each other.

When the first barrier sheet 100 and the third barrier sheet 400 are overlapped, interference occurs in the other barrier sheets regardless of which barrier sheet is overlapped. In this case, in order to prevent the interference of the wrinkles, the wrinkles can be removed by an overlapping area. Overlap welding is performed after overlapping the other barrier sheets on the barrier sheet from which a part of the wrinkles is removed. Since the end portion of the wrinkle portion, which has been partially removed, is exposed to the accommodation space, it can be sealed using the end portion sheet 300 of FIG. 3 to maintain airtightness.

10 shows an embodiment in which the first barrier sheet 100 and the third barrier sheet 400 are overlapped and welded after the connecting sheet 500 is placed between the first barrier sheet 100 and the third barrier sheet 400, . That is, one side end of the connecting sheet 500 is overlapped with the edge of the first barrier sheet 100, the other side edge of the connecting sheet 500 is overlapped with the edge of the third barrier sheet 400, . At this time, in order to prevent the wrinkles 110 of the first barrier sheet and the wrinkles 410 of the third barrier sheet from interfering with the connection sheet 500, .

The corrugated portion 510 of the connection sheet has first folds 510-1 connecting the corrugated portion 110 of the first barrier sheet and the corrugated portion 410-1 of the third barrier sheet, And second and third wrinkles 510-2 and 410-3 connecting the wrinkles 110 of the first barrier sheet and the wrinkles 410-2 and 410-3 of the third barrier sheet, , And a fourth folding part 510-4 that terminates the end of the corrugation part 410-4 of one of the barrier sheets and terminates by performing a curved surface treatment. The degree of displacement of the corrugated portion 110 of the first barrier sheet and the second corrugated portion 410-2 of the third barrier sheet and the degree to which the corrugated portion 110 of the second barrier sheet and the third corrugated portion 410-3 may be different from each other. Therefore, the connecting sheet 500 may be provided with second and third wrinkles 510-2 and 510-3, which are inclined so as to correspond to the positions of the wrinkles to be connected to both ends in advance.

In this case, a method of connecting the fourth corrugated part 410-4 to both the corrugated part 110 of the first barrier sheet and the corrugated part 410 of the third barrier sheet can be used. However, It is possible to connect the corrugated portion 110 of the first barrier sheet and the corrugated portion 410 of the third barrier sheet like the first to third corrugations 510-3 in that heat stress is dispersed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Accordingly, the true scope of the invention should be determined only by the appended claims.

10: kitchen wall, 11: first barrier rib,
12: second barrier rib, 13: intersection,
20: an insulating panel assembly, 21: an upper insulating panel,
22: lower insulation panel, 23: auxiliary barrier,
24: reinforcement panel, 30: outer wall,
31: mastic, 32: stud bolt,
100: first barrier sheet, 101: exposed portion,
102: overlap portion, 110: first direction corrugated portion,
111: exposed portion, 112: overlapping portion,
120: second direction corrugated portion, 200: second barrier sheet,
201: exposed portion, 202: connecting portion,
203: overlapping portion, 210: first direction corrugated portion,
210-1: first wrinkle portion, 210-2: second wrinkle portion,
211: exposed portion, 212: connecting portion,
213: overlap portion, 220: second direction corrugated portion,
300: end portion sheet, 301: exposed portion,
302: connection portion, 303: overlap portion,
310: corrugated portion, 311: exposed portion,
312: connection portion, 313: overlap portion,
400: third barrier sheet, 410: first direction corrugated portion,
410-1: first wrinkle portion, 410-2: second wrinkle portion,
410-3: third wrinkle portion, 410-4: fourth wrinkle portion,
420: second direction corrugated part, 500: connecting sheet,
510-1: first wrinkle portion, 510-2: second wrinkle portion,
510-3: third wrinkle portion, 510-4: fourth wrinkle portion,

Claims (8)

And a heat insulating panel assembly surrounding the barrier and insulating the liquefied gas from the outside,
Wherein the barrier is formed by connecting a plurality of barrier sheets protruding toward the accommodation space and including a plurality of wrinkles arranged in parallel with each other, wherein adjacent barrier sheets are welded to maintain airtightness,
Wherein the barrier sheet is provided in a plurality of areas defined in the cargo hold,
Wherein the barrier sheets provided in the plurality of regions have different thicknesses,
Wherein the spacing between adjacent pleats of the thicker barrier sheet of the barrier sheet is less than the spacing between adjacent pleats of the thinner barrier sheet. delete The method according to claim 1,
Wherein the barrier sheets having different thicknesses are connected in a state in which a part of the edges are overlapped with each other. The method of claim 3,
Wherein the corrugated portion of the barrier sheet inserted downward of the overlapping barrier sheet is inserted and welded into the corrugated portion of the barrier sheet to be covered. The method according to claim 1,
The first barrier sheet being the thinner barrier sheet and the second barrier sheet being the thicker barrier sheet among the barrier sheets of different thicknesses connected to each other are connected so that the second barrier sheet is upward in a state where a part of the edges are overlapped with each other,
Wherein an interval between the adjacent wrinkles of the first barrier sheet is an integral multiple of an interval between the adjacent wrinkles of the second barrier sheet,
And an end sheet is welded to an end portion of the wrinkle portion of the second barrier sheet that is not connected to the wrinkle portion of the first barrier sheet to cover the edge of the second barrier sheet, Wherein the first barrier sheet is connected to the corrugation not connected to the corrugation and the corrugation ends at the end. The method of claim 3,
Wherein an engaging portion of the barrier sheet that covers the top of the overlapping barrier sheet is stepped to correspond to a thickness of the barrier sheet inserted downward of the overlapping barrier sheet. The method according to claim 1,
The first barrier sheet as the thinner barrier sheet and the second barrier sheet as the thicker barrier sheet among the barrier sheets of the different thicknesses connected to each other are respectively formed on the opposite edges of the first barrier sheet And a part of an edge of the second barrier sheet are overlapped,
Wherein the corrugation of the second barrier sheet is arranged to be offset from the corrugation of the first barrier sheet by a corrugation of the connection sheet. The method according to claim 1,
Wherein the thin barrier sheet among the barrier sheets having different thicknesses has a thickness in the range of 1.0 to 1.4 mm and the thicker barrier sheet among the barrier sheets having different thicknesses has a thickness in the range of 1.6 to 2.0 mm.

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