KR101644369B1 - Barriear sheet used for cargo and cargo for liguefied gas - Google Patents

Abstract

Disclosed is a liquefied gas holding window including a barrier sheet and an insulating panel structure used in a liquefied gas holding window for sealing an insulating panel. A barrier sheet used in a liquefied gas holding window according to an embodiment of the present invention is used in a liquefied gas holding window to seal a heat insulating panel and includes a flat portion and a wrinkled portion in the out-of-plane direction in the flat portion, And a corrugated reverse wrinkle portion.

Description

{BARRIEAR SHEET USED FOR CARGO AND CARGO FOR LIGUEFIED GAS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrier sheet and a liquefied gas holding window used in a liquefied gas holding window, and more particularly to a liquefied gas holding window including a barrier sheet and an insulating panel structure used in a liquefied gas holding window for sealing an insulating panel.

Liquefied gas is a liquid made by cooling or compressing gas, and consumption of liquefied gas such as Liquefied Natural Gas (LPG) or LPG (Liquefied Petroleum Gas) is rapidly increasing worldwide.

Liquefied natural gas (LNG), which is an example of liquefied gas, refers to a colorless transparent cryogenic liquid having a volume of methane-based natural gas cooled to -162 ° C and reducing its volume by one-sixth, In order to utilize natural gas as energy, efficient transportation methods have been examined that can be mass-shipped from the production base to the destination of the demand site. As part of this effort, a liquefied natural gas transport vessel capable of transporting large volumes of liquefied natural gas to sea was developed.

The liquefied natural gas transportation vessel must have a cargo which can store and store the liquefied natural gas liquefied at a cryogenic 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. Such a cargo hold of a liquefied natural gas transportation vessel can be divided 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. Therefore, a membrane barrier is provided to seal the liquefied gas from the heat insulating panel. 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 that is easy to install.

According to one aspect of the present invention, there is provided a barrier sheet used in a liquefied gas holding window for sealing a heat insulating panel, the barrier sheet comprising a flat portion and a corrugated portion in a out-of-plane direction in the flat portion, A barrier sheet for use in a liquefied gas holding window including a corrugated reverse wrinkle portion may be provided.

Wherein the corrugation comprises a first corrugation portion arranged in a first direction and a second corrugation portion arranged in a second direction different from the first direction and an intersection where the first corrugation portion and the second corrugation portion intersect, May be provided.

And a height from a floor of the corrugation to a floor of the reverse wrinkle portion is equal to or smaller than a height from the flat portion to a floor of the corrugation portion.

A barrier sheet for use in a liquefied gas holding window in which a first reverse wrinkle portion provided in the first wrinkle portion is arranged in a first direction and a second reverse wrinkle portion provided in the second wrinkle portion is arranged in a second direction is provided .

The reverse wrinkle portion may be provided with a barrier sheet used in a liquefied gas holding window provided between two adjacent intersections.

A barrier sheet for use in a liquefied gas holding window having an alphabetical " W " shape in cross-sectional shape in a direction perpendicular to the direction in which the wrinkles are arranged in the wrinkle portion having the reverse wrinkle portion may be provided.

Sectional shape in the direction perpendicular to the direction in which the wrinkles are arranged in the corrugated portion provided with the reverse corrugated portion may be a barrier sheet used in a liquefied gas holding window having a quadratic curved shape.

The first corrugated portion and the second corrugated portion may extend to the edge of the barrier sheet, and the reverse corrugated portion may be provided inside the corners of the barrier sheet.

According to another aspect of the present invention, there is provided a liquefied gas cargo hold including a heat insulating panel for insulating a liquefied gas from the outside and a barrier for sealing the heat insulating panel, wherein the barrier is provided with a plurality of barrier sheets connected, The sheet may include a flat portion and a corrugated portion which is corrugated in an out-of-plane direction in the flat portion, and the corrugated portion may be provided with a liquefied gas cargo window including corrugated reverse corrugations in a direction opposite to the out-of-plane direction.

Wherein the corrugation portion includes a first corrugation portion arranged in a first direction, a second corrugation portion arranged in a second direction different from the first direction, and an intersection portion where the first corrugation portion and the second corrugation portion intersect, 1, the first reverse wrinkle portion provided in the first wrinkle portion is arranged in the first direction, and the second reverse wrinkle portion provided in the second wrinkle portion is arranged in the second direction.

The reverse wrinkle portion may be provided with a liquefied gas cargo window provided between two adjacent intersections.

Wherein the insulating panel comprises a lower insulating panel and an upper insulating panel, the barrier having an auxiliary barrier sealing the lower insulating panel and provided with an auxiliary barrier sheet continuously connected to the upper insulating panel, and sealing the upper insulating panel, Wherein the corrugated portion of the auxiliary barrier is corrugated downward toward the lower thermal insulation panel and the inverted corrugation is corrugated upwardly toward the upper insulation panel, The height of the reverse wrinkle portion to the floor may be equal to or smaller than the height from the flat portion to the floor of the wrinkle portion.

The barrier sheet and the liquefied gas holding window used in the liquefied gas holding window according to the embodiment of the present invention can facilitate clamping in the manufacture and maintenance of the membrane barrier, thereby saving time and cost.

In addition, the surface stiffness of the membrane barrier can be increased and the resistance to sloshing load can be increased.

1 is a perspective view of a partially assembled liquefied gas holding window according to an embodiment of the present invention.
2 is a cross-sectional view showing the structure of a liquefied gas holding window according to an embodiment of the present invention.
3 is an exploded perspective view showing an assembled state of the auxiliary barrier.
4 is an enlarged view of Fig.
5 is a cross-sectional view showing an assembled state of the upper insulating panel.
Fig. 6 is a perspective view showing a state of engagement of the kitchen wall. Fig.
7 is a perspective view illustrating a corrugation of an auxiliary barrier according to an embodiment of the present invention.
Fig. 8 is a plan view of Fig. 7. Fig.
Fig. 9 is a sectional view of Fig. 8. Fig.
10 is an exemplary view showing a state in which a corrugation of an auxiliary barrier is clamped according to an 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.

The liquefied gas holding window according to an embodiment of the present invention can be used to store and / or transport cryogenic liquefied gas. The liquefied gas is made of liquid by cooling or compressing the gas, and includes liquefied natural gas (LNG), liquefied petroleum gas (LPG), dimethyl ether (DME) and the like .

Liquefied gas cargo holds are used to transport liquid gas such as LNG carrier, LNG RV (Regasification Vessel) carrier, LPG carrier or ethylene carrier, FSRU (Floating Storage Regulation Unit), FPSO (Floating Production Storage Offloading) Or Barge Mounted Power Plant (BMPP), or to marine floating plants with vaporization facilities. In addition, the liquefied gas cargo holds include not only the facilities installed on the sea, but also those used for facilities to store or produce liquefied gas installed on land.

Hereinafter, a membrane-type cargo hold of a liquefied gas holding cargo will be described as an example. FIG. 1 is a partially assembled perspective view illustrating a structure of a liquefied gas holding window according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating a structure of a liquefied gas holding window according to an embodiment of the present invention.

1 and 2, the liquefied gas holding window surrounds a space capable of accommodating the liquefied gas and includes a main wall 50 in direct contact with the liquefied gas, and a lid 40 surrounding the main wall 50, And an outer wall 10 which surrounds and firmly supports the heat insulating panel assembly.

The kitchen wall 50 is for sealing the storage space in which the storage fluid is received, and requires airtightness (or watertightness). Liquefied gas is usually stored in a liquid state because it can be kept at a cryogenic temperature below the boiling point. However, depending on the change of temperature or pressure, vaporization of some liquefied gas may occur, and the pressure inside the cargo hold increases greatly. When the kitchen wall 50 penetrates due to such an increase in pressure or the like, the liquid or gaseous liquefied gas can be introduced into the insulating panel assembly. As the temperature of the introduced liquefied gas increases, the volume rapidly expands and damages the heat insulating panel assembly. 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.

Metal material such as an invar alloy (INVAR), stainless steel (SUS), or an aluminum alloy can be used to maintain the physical and chemical conditions of the kitchen wall 50 even at a low temperature. The kitchen wall 50 may be formed by connecting a plurality of kitchen wall 50 sheets and may be welded to each other to maintain airtightness.

As a method of welding the kitchen wall 50, various welding methods used in the related art can be used and include lap welding or butt welding. An automatic welding apparatus using laser welding or plasma welding may also be used to improve uniformity of work quality while improving welding quality. Above-mentioned lap welding, butt welding, laser welding, plasma welding, etc. are well known in the related art, so a detailed description will be omitted.

Because the kitchen wall 50 is in direct contact with the cryogenic storage fluid, it is exposed to rapid contraction and expansion. The kitchen wall 50 may be damaged due to accumulation of fatigue due to repeated heat shrinkage and thermal expansion, or breakage of the welded portion when heat shrinkage occurs. Because of this problem, the kitchen wall 50 includes a corrugation 51 to have an in-plane stiffness. The corrugated portion 51 is elastically deformed in shape corresponding to the thermal stress, thereby reducing the thermal stress at the welded portion.

The kitchen wall 50 includes first and second wrinkles 51-1 and 51-2 arranged in different directions and an intersection 52 at which the two wrinkles 51 intersect . The thermal stress acting in the in-plane direction of the kitchen wall 50 can be solved by the two-directional wrinkles 51. That is, the thermal stress acting in the longitudinal direction of the first wrinkled portion 51-1 is canceled by the elasticity of the second wrinkled portion 51-2, and the thermal stress acting in the longitudinal direction of the second wrinkled portion 51-2 Can be solved by the stretchability of the first wrinkled portion 51-1.

Although the two-directional wrinkles 51 are vertically arranged in the figure, they may include three or more wrinkles as required. For example, the three corrugations may be arranged at an angle of 60 degrees with respect to each other.

The heat insulating panel assembly includes an insulating panel assembly installed on a plane portion and an insulating panel assembly installed on a corner portion. The corner portion connects the flat portions disposed at different angles and includes a corner portion to which two different heat insulating panels are connected and a vertex portion to which three different heat insulating panels are connected. Hereinafter, the heat insulating panel assembly provided on the flat surface will be described as a basis.

The heat insulating panels 20 and 30 can be generally made of a material having excellent heat insulation performance and light weight such as polyurethane foam (PUF) or reinforced polyurethane foam (R-PUF, Reinforced PUF) It can be kept at an ultra-low temperature state by being insulated from the outside. The heat insulating panel assembly generally has a double insulation structure including the upper heat insulating panel 30 and the lower heat insulating panel 20 for the purpose of improving the heat insulating performance and facilitating the repair.

An inner hull can be used for the outer wall 10 and supports the load of the storage fluid. The lower insulation panel 20 may be fixed to the outer wall 10.

The lower first reinforcing panel 21 can be coupled to the bottom surface so as to be firmly fixed to the outer wall 10. The lower first reinforcing panel 21 can be coupled to the outer wall 10 by various fixing members including the stud bolts 12, 10). ≪ / RTI > The lower first reinforcing panel 21 may be made of plywood or the like and may be attached to the bottom surface of the lower insulating panel 20 using an adhesive such as an epoxy glue or the like.

The insulating panel assembly may include an auxiliary barrier 40 interposed between the upper insulating panel 30 and the lower insulating panel 20. The auxiliary barrier 40 protects the lower insulation panel 20 when the kitchen wall 50 is infiltrated, thereby greatly reducing the time and cost required for the repair.

The auxiliary barrier 40 may be formed of a metal material such as an INVAR, stainless steel or aluminum alloy as in the case of the kitchen wall 50 or a rigid triplex and a support triple triplex) can be used.

The adhesive type manufacturing method and the welding type manufacturing method are used in accordance with the difference in the method of joining the auxiliary barrier 40 to the lower heat insulating panel 20. [ Although not shown in the drawing, in the adhesive type manufacturing method, a rigid triplex is attached by using an adhesive such as epoxy glue on the lower insulating panel 20, and the adjacent rigid triplex is connected with a support triplex, State can be completed. At this time, the shuffle triplex may also be attached to the rigid triplex by an adhesive.

A liquefied gas holding window according to an embodiment of the present invention is a welded manufacturing method in which adjacent auxiliary walls 40 are welded together. The welding method is such that the auxiliary barrier 40 is mechanically coupled instead of bonding to the lower insulating panel 20 and the upper insulating panel 30 is also bonded to the lower insulating panel 20 20).

Hereinafter, a liquefied gas holding window and a method of manufacturing the same according to an embodiment of the present invention will be described.

First, the installation process of the lower insulating panel 20 will be described with reference to FIG.

The lower heat insulating panel 20 may be coupled to the outer wall 10 through a lower first reinforcing panel 21 adhered to the bottom surface. The outer wall 10 may be welded with a stud bolt 12 for joining the lower insulating panel 20. Through holes 20a and 21a are formed in the lower heat insulating panel 20 and the lower first reinforcing panel 21 so that the stud bolts 12 can pass therethrough. The diameter of the through hole 21a formed in the lower first reinforcing panel 21 may be smaller than the diameter of the through hole 20a formed in the lower heat insulating panel 20. [

The stud bolt 12 is inserted into the through hole 20a formed in the corner of the lower heat insulating panel 20 and is engaged with the nut and the nut is engaged with the stud bolt 12 to thereby connect the lower first reinforcing panel 21 Restraint. As a result, the lower heat insulating panel 20 to which the lower first reinforcing panel 21 is attached is joined to the outer wall 10. At this time, the foam plug 20b may be inserted into the through hole 20a to maintain the heat insulating performance.

A mastic 11 having an adhesive force and / or a level pad 13 for adjusting a level difference may be interposed between the lower first reinforcing panel 21 and the outer wall 10. In particular, since the mastic 11 has both adhesive force and elasticity, it is possible to combine the outer wall 10 and the lower heat insulating panel 20 and alleviate the impact transmitted to each other.

The plurality of lower insulating panels 20 may be disposed adjacent to each other, and may be arranged in a lattice pattern, for example. The arrangement in the form of a lattice means that the lower insulating panels 20 are disposed not only adjacent to each other in the first direction but also adjacent to each other in the second direction.

And the lower joint 23 can be inserted between the adjacent lower heat insulating panels 20. The lower joint 23 may be a heat insulating material capable of filling a gap between the lower heat insulating panels 20, and a glass wool or the like may be used. The lower joint 23 may be inserted after the lower insulating panel 20 is installed or attached to the side of the lower insulating panel 20.

Next, the process of installing the auxiliary barrier 40 on the lower insulating panel 20 will be described with reference to FIGS. 3 and 4. FIG. Fig. 3 is an exploded perspective view showing a state of engagement of the auxiliary barrier, and Fig. 4 is an enlarged view of Fig.

A lower second reinforcing panel 22 may be laminated on the upper part of the lower insulating panel 20 for installing the auxiliary barrier 40. The lower second reinforcing panel 22 may be made of plywood or the like and may be attached to the lower insulating panel 20 using an adhesive such as an epoxy glue or the like.

An auxiliary barrier connecting member 24 may be provided on the upper part of the lower insulating panel 20. Particularly, when the lower second reinforcing panel 22 is provided, the auxiliary barrier connecting member 24 can be coupled to the upper surface of the lower second reinforcing panel 22. [ The auxiliary barrier connecting member 24 may be made of a metal such as SUS and welded to the auxiliary barrier 40 and may be mechanically coupled to the lower second reinforcing panel 22 by a rivet 24a or the like. The auxiliary barrier connecting member 24 may be received in the groove 22a formed in the lower second reinforcing panel 22 and may not protrude from the upper surface of the lower second reinforcing panel 22. [

In addition, the auxiliary barrier connecting members 24 may be provided in a strip shape and may be arranged in different directions to form intersections. For example, two strips orthogonal to each other. The auxiliary barrier connecting member 24 may be provided parallel to the edge of the opposing lower insulating panel 20. In addition, the auxiliary barrier connecting member 24 may be provided in one strip or may be provided such that a plurality of strips are continuously connected.

A panel fixing unit 25 for fixing the upper insulating panel 30 may be provided on the lower insulating panel 20. In particular, when the lower second reinforcing panel 22 is provided, the panel fixing unit 25 can be coupled to the upper surface of the lower second reinforcing panel 22. [ The panel fixing unit 25 includes an engaging portion 25a mechanically coupled to the lower second reinforcing panel 22 by means of a rivet 25c or the like, And may include projecting members 25b that engage with each other. The panel fixing unit 25 may be received in the groove 22b formed in the lower second reinforcing panel 22 and may not protrude from the upper surface of the lower second reinforcing panel 22. [

The lower insulating panel 20 may have a square shape when viewed from above, and it is preferable that the lower insulating panel 20 is of a weight and size sufficient for the operator to work manually. If the lower insulating panel 20 is large and heavy, it must be operated using mechanical equipment, which increases the cost and time required in the manufacturing process. In the case of the lower heat insulating panel 20, since the mastic 11 is normally attached to the bottom surface of the lower insulating panel 20, the efficiency may be lowered when using mechanical equipment.

For example, the bottom insulating panel 20 according to the embodiment of the present invention may use a reinforced polyurethane foam (R-PUF) having a size of about 1000 mm * 1000 mm, but the weight may be around 20 kg. Therefore, two workers can work manually by using a vacuum gripper or the like.

The auxiliary barrier connecting member 24 is connected (including by being connected by a virtual extension line without being directly connected) with the adjacent auxiliary barrier connecting member 24 to form one closed figure. It is shown in the figure that eight lower insulating panels 20 are disposed adjacent to each other and a rectangular closed shape is formed by an auxiliary barrier connecting member 24 provided on the lower insulating panel 20. [

One auxiliary barrier 40 sheet constituting the auxiliary barrier 40 may have a shape corresponding to the shape of the closed figure formed by the auxiliary barrier connecting member 24. [ The corners of the sheets of the secondary barrier 40 may be arranged and fixed so as to overlap the secondary barrier connecting members 24, respectively. In one example, the sheet of secondary barrier 40 may be secured to the secondary barrier connecting member 24 in a tack welding manner.

At this time, a through hole (40a) through which the projecting member (25b) of the panel fixing unit (25) can penetrate is formed in the seat of the auxiliary barrier (40). After the completion of the installation of the auxiliary barrier 40, the through hole 40a and the panel fixing unit 25 are welded to each other to secure the airtightness of the auxiliary barrier 40. [

After one auxiliary barrier 40 sheet is fixed, another auxiliary barrier 40 sheet may be fixed to the adjacent one side. At this time, at least one corner of the edge of the auxiliary barrier 40 sheet adjacent to the auxiliary barrier 40 sheet is arranged to overlap with the sheet of the auxiliary barrier 40 previously provided, and the other edge is disposed on the auxiliary barrier connection member 24 As shown in FIG. For example, the fixing of the auxiliary barrier 40 sheet and the auxiliary barrier 40 sheet and the securing of the auxiliary barrier 40 sheet and the auxiliary barrier connection member 24 can be performed using a tack welding method.

The above installation process is continuously performed to fix all the sheets of the auxiliary barrier 40 on the lower insulating panel 20. [ However, since it is still in a state of being in a state of being in contact with the gap between the adjoining auxiliary barrier 40 sheets, it is necessary to perform the main welding in order to maintain airtightness.

Both edges of the sheets of the auxiliary barrier wall 40 adjacent to each other are welded by lap welding or butt welding, thereby ensuring airtightness. As the welding method which can be used at this time, various welding methods used in the related art can be used. An automatic welding apparatus using laser welding or plasma welding may also be used to improve uniformity of work quality while improving welding quality. Above-mentioned lap welding, butt welding, laser welding, plasma welding, etc. are well known in the related art, so a detailed description will be omitted.

On the other hand, the auxiliary barrier connecting member 24 can be prevented from being deformed by the welding heat due to the welding heat (or welding seam) when the adjacent auxiliary barrier walls 40 are welded to each other . It is possible to prevent deformation of the auxiliary barrier 40 sheet, which may be caused by high temperature, particularly when plasma welding is used. At this time, in the process of overlap welding or butt welding of the sheets of the auxiliary barrier 40, the welding heat is transmitted to the auxiliary barrier connecting member 24, and the auxiliary barrier connecting member 24 and the auxiliary barrier 40, The sheets may be welded together.

Since the upper barrier panel 40 is located between the upper insulating panel 30 and the storage fluid, a certain amount of thermal deformation can not be avoided even if the thermal barrier is not greatly generated as the main wall 50. In the case of the adhesive type manufacturing method in which the auxiliary barrier and the lower insulating panel are bonded by bonding, stress is applied to the bonding surface with the lower insulating panel due to shrinkage and expansion of the auxiliary barrier.

The secondary barrier 40 may include a corrugation 41 to have an in-plane stiffness. The corrugated portion 41 is elastically deformed in shape corresponding to the thermal stress, thereby reducing the thermal stress at the welded portion.

The auxiliary barrier 40 includes first and second wrinkled portions 41-1 and 41-2 arranged in different directions and an intersection portion 42 where the two wrinkled portions 41 intersect with each other . The thermal stress acting in the in-plane direction of the auxiliary barrier 40 can be relieved by the two-directional folds 41. [ That is, the thermal stress acting in the longitudinal direction of the first wrinkled portion 41-1 is canceled by the elasticity of the second wrinkled portion 41-2, and the thermal stress acting in the longitudinal direction of the second wrinkled portion 41-2 Can be solved by the stretchability of the first wrinkled portion 411-.

Although the two-sided wrinkle portions 41 are shown vertically, they may include three or more wrinkles as required. For example, the three corrugations may be arranged at an angle of 60 degrees with respect to each other.

The corrugated portion 41 provided on the auxiliary barrier 40 can be convex downward toward the lower insulating panel 20 and can be located at the boundary between two adjacent lower insulating panels 20. [ At this time, a chamfer is formed in the corner of the upper portion of the lower insulating panel 20 so as to accommodate the corrugation portion 41, so that interference with the corrugated portion 41 can be avoided.

The auxiliary barrier 40 sheet may be provided so as to extend across the plurality of lower insulating panels 20. [ The meaning of being laid over the lower insulating panel 20 includes the case of completely covering and the case of covering only partly. For example, in FIG. 1, it is shown that one auxiliary barrier 40 sheet is provided over eight lower insulating panels 20.

On the other hand, the edges of the sheets of the auxiliary barrier 40 are seated so as to deviate from the center line of the lower insulating panel 20. The edge of the auxiliary barrier 40 sheet is required to be fixed to the panel fixing unit 25 located at the center of the lower insulating panel 20 because it must be welded to the edge of the auxiliary barrier connecting member 24 and / In order to prevent overlapping. It has been described above that the interference between the auxiliary barrier 40 sheet and the panel fixing unit 25 can be prevented by forming the through hole 40a through which the projecting member 25b penetrates the auxiliary barrier 40 sheet.

The length L of one side of the auxiliary barrier 40 sheet is smaller than the number n of the lower insulating panel 20 by subtracting one from the number n of the bottom insulating panels 20 covered by the auxiliary barrier 40 sheet. The length D of the one side of the light-emitting diode chip. The length L of the precise sides of the secondary barrier 40 sheet can be determined by the distance spaced between adjacent lower insulating panels 20 and the spacing that overlaps when the secondary barrier 40 sheets are welded together. In the drawing, when the length of one side of the lower insulating panel 20 is a, the length of the longer side of the auxiliary barrier 40 is slightly larger than 3a and the length of the smaller side is slightly larger than a.

The auxiliary barrier 40 sheet is provided with a corrugated portion 41 accommodated in a boundary between the lower insulating panels 20. The corrugated portion 41 may be formed by a press method or the like. In the figure, three corrugations are formed on the long side of the auxiliary barrier 40, and one corrugation is formed on the small side.

A folding portion 41 corresponding to the boundary between the lower insulating panels 20 on which the sheet of the auxiliary barrier 40 covers is formed and the crossing portion 42 is formed on the sheet As shown in FIG. The through hole 40a through which the protruding member 25b penetrates is also biased in the opposite direction with respect to the center of one side of the sheet.

The panel fixing unit 25 is positioned at the center of the lower heat insulating panel 20 and the auxiliary wall connecting member 24 is positioned parallel to the edge of the lower heat insulating panel 20, And that the auxiliary barrier 40 is provided in a shape corresponding to the closed figure of the auxiliary barrier connecting member 24 formed by connecting the plurality of the bottom insulating panels 20 And the auxiliary barrier 40 is provided with a corrugated portion 41 accommodated in the boundary of the adjacent lower insulating panel 20 and the first corrugated portion 41-1 and the second corrugated portion 41 are formed at the portion where the four lower heat insulating panels 20 meet. And the second barrier rib 40 is provided with a through hole 40a through which the protruding member 25b of the panel fixing unit 25 can penetrate, ) Is a feature that facilitates fabrication and shortens fabrication time.

The lower first reinforcing panel 21 and the lower second reinforcing panel 22 are stacked and the plurality of lower heat insulating panels 20 having the auxiliary wall connecting member 24 and the panel fixing unit 25 are installed, It is possible to arrange the auxiliary barrier ribs 40 on the outer wall 10 by fixing the plurality of auxiliary barrier ribs 40 to the auxiliary barrier rib connecting member 24 and welding the sheets of the auxiliary barrier 40 to each other, It becomes. At this time, the auxiliary barriers 40 can be manufactured in the same manner as the sheets provided in the same shape.

The main welding of the auxiliary barrier 40 sheet and the auxiliary barrier 40 sheet can use an automatic welding device. In particular, welding of the corrugations of the auxiliary barrier 40 can also be performed using an automatic welding apparatus. At this time, in order to manually weld the worker to weld the sheets of the auxiliary barrier 40 and the auxiliary barrier 40 of thin thickness, or to use the automatic welding apparatus, Fit-Up. In particular, the use of automatic welding equipment is important to the work of the foot.

Up work may be performed by a fit-up zig (not shown) fixedly installed on the lower insulating panel 20. [ Up jig can be fixed to the auxiliary barrier 40 sheet by being engaged with the stud bolt projecting to the panel fixing unit 25 or by a suction type.

The worker can close the sheets of the auxiliary barrier 40 by pressing the sheet of the auxiliary barrier 40 covering the upper part with the use of the pick-up jig or by raising the sheet of the auxiliary barrier 40 which is placed below. At this time, in order to raise the sheet of the auxiliary barrier wall 40 placed below, an adsorption method and a bonding method can be used.

Usually, after the sheet of the auxiliary barrier 40 is wiped, the abutting is performed to fix the sheets of the auxiliary barrier 40 to each other. The sheets of auxiliary barrier 40 secured to each other are easily weldable by automatic welding equipment. In particular, in the case of a wrinkle portion including a curved portion, a sophisticated work of finishing is required in order to improve the welding quality by the automatic welding device.

The automatic welding apparatus performs welding while moving along a rail which is fixed to the lower insulating panel 20. [ Therefore, in order to use the automatic welding device, it is necessary to fix the rail around the welding line.

In the method of manufacturing the liquefied gas holding window according to the embodiment of the present invention, the rails can be fixedly installed using the panel fixing unit 25 for fixing the lower insulating panel 20 and the upper insulating panel 30. It has been described that the protruding member 25b protruding for fixing the upper insulating panel 30 to the panel fixing unit 25 may be provided. The rails of the automatic welding apparatus may be fixedly coupled to the protruding members 25b of the panel fixing unit 25 and may be coupled to other shapes of coupling members (not shown) provided separately to the panel fixing unit 25 .

A panel fixing unit 25 may be provided at the center of the lower insulating panel 20 and an auxiliary barrier connecting member 24 may be provided at the side of the panel fixing unit 25. On the other hand, unlike the drawing, the auxiliary barrier connecting member 24 and the panel fixing unit 25 may be in contact without being separated from each other.

Next, a method of welding the sheet of the auxiliary barrier 40 using the automatic welding apparatus will be described.

It has been described that the sheet of the auxiliary barrier 40 is previously contacted to the auxiliary barrier connecting member 24 and the adjoining auxiliary barrier 40 sheets are contacted and fixed to each other. Now, by performing the main weld along a line (weld line) where the sheets of the two auxiliary walls 40 overlap or abut, the installation of the auxiliary barrier is completed. A rail can be installed near the weld line so that the automatic welding device can move along the weld line. In this case, when the rail and the weld line are provided in parallel, the welding quality can be improved and the working time can be shortened.

The rails can be fixed to a plurality of panel fixing units 25 arranged in one direction and installed parallel to the weld line. At this time, since the panel fixing unit 25 and the auxiliary barrier connecting member 24 are disposed adjacent to each other, the automatic welding apparatus installed on the rails can facilitate welding work along the weld line. After the automatic welding is completed, the rails are disassembled from the panel fixing unit 25.

The through hole 40a is formed so that the projecting member 25b of the panel fixing unit 25 penetrates through the sheet of the auxiliary barrier 40, as described above. In order to ensure the airtightness of the auxiliary barrier 40, the edge of the hole formed in the sheet of the auxiliary barrier 40 is welded to the panel fixing unit 25, and arc welding may be performed along the shape of the through hole 40a.

When welding of the auxiliary barrier 40 is completed, it is checked whether the airtightness is secured. As the inspection process, a method of injecting a test gas between the auxiliary barrier 40 and the lower insulating panel 20 and checking whether the test gas leaks to the outside can be used. If the inspection gas is detected from the outside as an inspection result, it is judged that the welding condition of the part is defective and re-welding is performed. On the other hand, if it is determined that the airtightness is ensured, the process for installing the upper insulating panel 30 proceeds to the next step.

Next, the process of installing the upper insulating panel 30 will be described with reference to FIG. 5 is a cross-sectional view showing an assembled state of the upper insulating panel.

The plurality of upper insulating panels 30 may be disposed adjacent to each other, and may be arranged in a lattice pattern, for example. It is meant that the upper insulating panels 30 are disposed adjacent to each other in the second direction as well as disposed adjacent to each other in the first direction.

An upper joint 33 may be inserted between the adjacent upper heat insulating panels 12. The upper joint 33 may be a thermal insulation material capable of filling a gap between the upper insulating panels 30, and a glass wool or the like may be used. The upper joint 33 may be installed after the upper insulating panel 30 is installed or attached to the side of the upper insulating panel 30.

If the distance between the lower insulating panels 20 is neglected (generally very narrow), the upper insulating panel 30 may be provided in an approximately multiples of the size of the lower insulating panel 20. In this case, the edge of the upper insulating panel 30 is aligned with the boundary between the lower insulating panels 20. Accordingly, the upper insulating panel 30 can be installed in a manner similar to the installation process of the lower insulating panel 20, thereby enhancing the convenience of manufacture.

If the corner of the upper heat insulating panel 30 does not coincide with the boundary of the lower heat insulating panel 20 but is staggered with the lower heat insulating panel 20, the upper heat insulating panel 30 is fixed to the lower heat insulating panel 20 A connecting panel (not shown) must be inserted into the gap between the upper insulating panels 30, and at this time, the connecting panel is fixed by bonding, which is inconvenient to manufacture.

The upper first reinforcing panel 31 may be coupled to the bottom surface so that the upper insulating panel 30 can be firmly fixed to the lower heat insulating panel 20. [ The upper first reinforcing panel 31 may be made of plywood or the like and attached to the bottom surface of the upper insulating panel 30 using an adhesive such as epoxy glue.

The upper insulating panel 30 and the upper first reinforcing panel 31 are formed with through holes 30a and 31a so that the projecting members 25b can pass through. The diameter of the through hole 31a formed in the upper first reinforcing panel 31 may be smaller than the diameter of the through hole 30a formed in the upper insulating panel 30.

The diameter of the through hole 31a formed in the upper first reinforcing panel 31 may be the same as the diameter of the protruding member 25b. The upper first reinforcing panel 31 is prevented from moving relative to the projecting member 25b.

The protruding member 25b is inserted into the through hole 30a formed at the center of the upper heat insulating panel 30 and joined with the nut and the nut is engaged with the protruding member 25b to form the upper first reinforcing panel 31 ). As a result, the upper heat insulating panel 30 to which the upper first reinforcing panel 31 is attached is joined to the lower heat insulating panel 20. At this time, the foam plug 30b may be inserted into the through hole 30a to maintain the heat insulating performance.

The upper insulating panel 30 may be provided in a size and shape corresponding to the area where the two lower insulating panels 20 are disposed adjacent to each other. For example, when the lower insulation panel 20 having a square (1 X 1) as viewed from above is provided as shown in the drawing, the upper insulation panel 30 has a rectangular shape having two sides of one side, (1 x 2). It is a matter of course that the ratio of the shape and length of the specific heat insulating panels 20 and 30 may be varied depending on the case.

The upper insulating panel 30 may be joined by one lower fixing panel 20 and one panel fixing unit 25 located at the center of the lower insulating panel 20. In this case, two panel fixing units 25 may be coupled to one upper insulating panel 30. By providing two fixing points on the upper heat insulating panel 30, rotation of the upper heat insulating panel is prevented.

If the shape and size of the upper insulating panel 30 are the same as those of the lower insulating panel 20 or the like, unlike the drawings, The upper and lower thermal insulation panels 30 and 20 are fixed to each other. However, in this case, the upper insulating panel 30 is allowed to rotate on the lower insulating panel 20.

If rotation of the upper insulating panel 30 is allowed, inconvenience may be caused in the manufacturing process. In particular, when the upper insulating panel 30 is installed on the side surface or the ceiling, the upper insulating panel 30 may rotate unintentionally, which may take time and effort to align them. Also, since the upper insulating panel 30 is allowed to rotate, stress may be generated between the adjacent upper heat insulating panels 30, thereby reducing the durability of the cargo window. Further, stress is concentrated on the main wall 20 fixed to the upper heat insulating panel 30, which may cause damage to the welded portion or the like.

In the above description, two or more lower heat insulating panels 20 are coupled to one upper heat insulating panel 30 to prevent rotation of the upper heat insulating panel 30. Alternatively, one upper insulating panel 30 And one lower insulating panel 20 are combined and a plurality of panel fixing units 25 are provided.

An upper second reinforcing panel 32 may be laminated on the top of the upper insulating panel 30 for installing the kitchen wall 50. The upper second reinforcing panel 32 may be made of plywood or the like and may be attached to the upper insulating panel 30 using an adhesive such as an epoxy glue or the like.

The upper wall of the upper insulating panel 12 may be provided with a kitchen wall connecting member 34. In particular, when the upper second reinforcing panel 32 is provided, the main body wall connecting member 34 can be coupled to the upper surface of the upper second reinforcing panel 32. The kitchen wall connecting member 34 is made of a metal such as SUS and can be welded to the kitchen wall 50 and mechanically coupled to the upper second reinforcing panel 32 by a rivet 34a or the like. The main body wall connecting member 34 may be received in the groove 32a formed in the upper second reinforcing panel 32 and may not protrude from the upper surface of the upper second reinforcing panel 32. [

In addition, the kitchen wall connecting members 34 may be provided in a strip shape and may be arranged in different directions to form intersections. For example, two strips orthogonal to each other. The kitchen wall connecting member 34 may be provided parallel to the edge of the facing upper insulating panel 30. In addition, the kitchen wall connecting member 34 may be provided in one strip or may be provided so that a plurality of strips are continuously connected.

A barrier wall member 35 for installing the kitchen wall 50 may be provided on the upper portion of the upper insulating panel 30. In particular, when the kitchen wall connecting member 34 is provided, the wall mounting member 35 may be provided on the upper portion of the kitchen wall connecting member 34.

It has been described above that a rail is to be installed for welding the seat of the secondary barrier 40 by using the automatic welding apparatus and a rail is provided for the panel fixing unit 25. [ Similarly, in order to weld a sheet of the kitchen wall 50 using an automatic welding apparatus, a barrier mounting member 35 capable of mounting a rail is required.

The barrier mounting member 35 may be a stud bolt provided at an intersection where the two-directional main body wall connecting members 34 are perpendicular to each other. The barrier mounting member 35 may be welded on the wall wall connecting member 34. [ The intersection where the two-way wall wall connecting member 34 provided with the barrier mounting member 35 meets may be a four-sheet intersection where four sheets of the kitchen wall 50 meet. The four sheets of the kitchen wall 50 may be welded around the barrier mounting member 35 when it is chamfered at the corner of the sheet of the kitchen wall 50 and may not interfere with the barrier mounting member 35. At this time, the corner portion of the seat of the kitchen wall 50 should be welded to the kitchen wall connecting member 34 to maintain airtightness.

The barrier mounting member 35 is for mounting the kitchen wall 50 and can be removed when the installation of the kitchen wall 50 is completed. This is because the operator can be treated as an obstacle when moving.

Next, the process of installing the kitchen wall 50 will be described with reference to FIG. Fig. 6 is a perspective view showing a state of engagement of the kitchen wall. Fig.

The main body wall connecting member 34 is connected to the adjacent main body wall connecting member 34 (including those connected by a virtual extension line without being directly connected thereto) to form one closed figure. In Fig. 1, four upper insulating panels 30 are arranged adjacent to each other, and a rectangular shaped closed figure is formed by a main body wall connecting member 34 provided on the upper insulating panel 30. In Fig.

One sheet of the kitchen wall 50 constituting the kitchen wall 50 may be in a shape corresponding to the shape of the closed figure formed by the kitchen wall connecting member 34, The four corners may be disposed and fixed so as to overlap with the respective wall wall connecting members 34, respectively. In one example, the seat of the kitchen wall 50 may be fixed to the kitchen wall connecting member 34 in a tack welding manner.

After one sheet of the kitchen wall 50 is fixed, another sheet of the kitchen wall 50 can be fixed to the adjacent one side. At this time, one corner of the four corners of the kitchen wall 50 sheet adjoining to the pre-installed kitchen wall 50 sheet is arranged to overlap with the pre-installed kitchen wall 50 sheet and the other three corners are connected to the kitchen wall connecting member 34 ) And can be fixed. The fixing of the seat of the kitchen wall 50 and the fixing of the seat of the kitchen wall 50 and the fixing of the seat wall and the kitchen wall connecting member 34 of the kitchen wall 50 may use a tack welding method.

The above installation process is continuously performed to fix all the sheets of the kitchen wall 50 on the upper heat insulating panel 30. [ However, since it is still in a state of being in contact with the gap between adjacent sheets of the kitchen wall 50, it is necessary to perform this welding in order to maintain airtightness.

Both edges of the adjacent sheet of the kitchen wall 50 are welded by lap welding or butt welding, thereby ensuring airtightness. As a welding method that can be used at this time, a method used for welding the auxiliary barrier can be used, and of course, an automatic welding device can be used.

On the other hand, the kitchen wall connecting member 34 is located below the welding line (or welding seam) when the adjacent sheets of the kitchen wall 50 are welded together, thereby preventing the sheet of the kitchen wall 50 from being deformed by the welding heat . It is possible to prevent deformation of the sheet of the kitchen wall 50, which may be caused by high temperature, particularly when plasma welding is used. At this time, in the process of overlap welding or butt welding of the sheets of the kitchen wall 50, the welding heat is transmitted to the kitchen wall connecting member 34 to connect the lower kitchen wall connecting member 34 and the kitchen wall 50 located thereon, The sheets may be welded together.

The main welding of the kitchen wall 50 sheet and the kitchen wall 50 sheet can utilize automatic welding equipment. In particular, welding of the corrugated portion of the kitchen wall 50 can also use an automatic welding apparatus. At this time, in order to manually weld the worker to weld the sheet of the kitchen wall 50 and the sheet of the kitchen wall 50 with a thin thickness or to use the automatic welding apparatus, Fit-Up. In particular, the use of automatic welding equipment is important to the work of the foot.

Since the same method as the process of installing the auxiliary barrier 40 can be used for the work of the fatigue, a detailed description will be omitted. The pick-up jig (not shown) may be fixed to the sheet of the kitchen wall 50 by being engaged with or adsorbing to the barrier-attaching member 35 provided on the kitchen wall connecting member 34.

The automatic welding apparatus performs welding while moving along the rails that are installed to be fixed to the upper insulating panel (30). Therefore, in order to use the automatic welding device, it is necessary to fix the rail around the welding line.

In the method of manufacturing the liquefied gas holding window according to the embodiment of the present invention, the rails can be fixed by using a barrier member 35 (for example, a stud bolt) provided on the main body wall connecting member 34.

Next, a method of welding the sheet of the kitchen wall 50 using the automatic welding apparatus will be described.

It has been described that the seat of the kitchen wall 50 is previously touched to the kitchen wall connecting member 34 and the adjacent sheets of the kitchen wall 50 are contacted and fixed to each other. Now, when the main welding is performed along the line (weld line) where the two kitchen wall 50 sheets overlap or abut, the installation of the kitchen wall is completed. A rail can be installed near the weld line so that the automatic welding device can move along the weld line. In this case, when the rail and the weld line are provided in parallel, the welding quality can be improved and the working time can be shortened.

The rails are fixed to a plurality of stud bolts arranged in one direction and are installed parallel to the welding line, so that the automatic welding apparatus installed on the rails can facilitate the work of welding along the welding line. After automatic welding is completed, the rail is disassembled from the stud bolt.

When the welding of the kitchen wall 50 is completed, it is checked whether the airtightness is secured. As the inspection process, a method of injecting a test gas between the kitchen wall 50 and the upper heat insulating panel 30 and checking whether the test gas leaks to the outside can be used. If the inspection gas is detected from the outside as an inspection result, it is judged that the welding condition of the part is defective and re-welding is performed.

The auxiliary barrier 40 sheet according to the embodiment of the present invention may include a reverse wrinkle portion 43 formed in the wrinkle portion 41. [ The reverse wrinkle portion 43 will be described with reference to Figs. FIG. 7 is a perspective view showing the corrugation 41 of the auxiliary barrier 40 according to the embodiment of the present invention, FIG. 8 is a plan view of FIG. 7, and FIG. 9 is a sectional view of FIG.

The sheet of auxiliary barrier 40 includes a planar portion and a corrugated portion 41 which is corrugated in an out-of-plane direction in the plane portion. The corrugated portion 41 has corrugated reverse corrugations 43: 43-1, 43-2.

Up work is important when welding the auxiliary barrier 40 sheets that meet each other previously. Particularly, when welding the corrugated portion 41 of the adjacent two auxiliary barrier walls 40, a more elaborate footwork is required as compared with welding the flat portion.

You can install a separate jig for your footwork, but the overall productivity may be deteriorated if the time and effort required to install and disassemble the jig is increased. The embodiment of the present invention can be used as a clamping unit in which a reverse jig 43 is formed in the corrugation 41 to provide a jig for fatigue. Therefore, it is possible to easily install and disassemble the fingering jig, so that the time and effort used to install and maintain the auxiliary barrier 40 can be reduced.

The first reverse wrinkle portion 43-1 provided in the first wrinkle portion 41-1 is arranged in the first direction and the second reverse wrinkle portion 43-2 provided in the second wrinkle portion 41-2 is arranged in the first direction, 2 may be arranged in a second direction. In addition, the reverse wrinkle portion 43 may be provided between two adjacent intersecting portions 42. It is possible to form the reverse wrinkle portion at the intersection portion 42. However, in consideration of the complicated shape of the intersection portion 42, the reverse wrinkle portion may be formed in the first wrinkle portion 41-1 and / or the second wrinkle portion 41-2 This is because it is easier to form the wrinkles 43.

Further, when the reverse wrinkle portion 43 is formed in the first wrinkle portion 41-1 and / or the second wrinkle portion 41-2, the fitting-up jig can be clamped closer to the weld line. That is, the reverse folded portion 43 can be formed at a portion near the edge of the sheet of the auxiliary barrier 40. However, at this time, it is preferable that the reverse wrinkle portion 43 is provided on the inner side of the edge. This is because the wrinkle shape of the welded portion becomes more complicated when the reverse wrinkle portion 43 is formed to extend to the edge, so that the difficulty of welding can be increased.

9 shows a cross-sectional shape in a direction perpendicular to the arranging direction of the corrugation 41 in the corrugated portion 41 provided with the reverse corrugated portion 43. Fig. Referring to the cross-sectional view, the shape of the inverted corrugation 43 is similar to the alphabet "W" shape. The shape of the reverse wrinkle portion 43 may be symmetrical with respect to the center line of the wrinkle portion 41. [

On the other hand, the shape of the reverse wrinkle portion 43 may be quadratic curved. The quadratic curve forms a convex quadratic curve between two convex downward quadratic curves. At this time, the curvature of the corrugated portion 41 and the curvature of the reverse corrugated portion 43 are not necessarily the same, but it is preferable that there is no discontinuity point from the corrugated portion 41 to the reverse corrugated portion 43. A discontinuity point means a point where the derivative can not be differentiated along a curve. If the discontinuity is included, the stress is concentrated at the discontinuity point and the risk of fatigue failure increases.

The height H2 from the floor of the wrinkle portion 41 to the floor of the reverse wrinkle portion 43 is set to be equal to or smaller than the height H1 from the flat portion to the floor of the wrinkle portion 41 ). That is, the reverse wrinkle portion 43 does not protrude upward from the upper surface of the flat surface portion. This is because the flat portion of the auxiliary barrier 40 supports the load of the upper heat insulating panel and interference occurs when the reverse wrinkle portion 43 protrudes. The height H2 from the floor of the corrugated portion 41 to the floor of the reverse corrugated portion 43 is smaller than the height H2 of the corrugated portion 43 in the planar portion in consideration of the case where the shape of the upper insulating panel or the auxiliary wall 40 is slightly changed. 41 (H1 > H2).

10 is an exemplary view showing a state in which the corrugation 41 of the auxiliary barrier 40 is clamped according to the embodiment of the present invention.

The clamping jig 100 can be used for the pick-up operation. The configuration of the clamping jig 100 is merely an embodiment, and it is also possible to use a configuration of another jig.

The clamping jig 100 includes a main body 110 to which a work arm (not shown) for work such as a foot-up is connected, a support arm 120 provided on one side of the main body 110, (130).

The support arms 120 are provided on the outer side of the main body 110 in pairs to support the inner side surfaces of the wrinkle portions 41. The shape of the outer surface of the support arm 120 may correspond to the inner surface shape of the corrugated portion 41, and an elastic body (rubber or sponge, etc.) capable of deforming the shape may be used. In addition, a frictional portion for increasing frictional force can be attached to the outside of the support arm 120. [

The clamping arms 130 are provided on the inner side of the main body 110 in a pair and grip the outer sides of the reverse wrinkles 43, respectively. The clamping arm 130 may form a link structure in which a pair of arms cross each other. That is, the smaller the crossover angle, the stronger the force can be. It is also possible to use an elastic body (rubber, sponge or the like) which can correspond to the outer shape of the reverse wrinkle portion 43 of the inner side surface of the clamping arm 130 and can deform the shape. Further, a frictional portion for increasing frictional force can be attached to the inside of the clamping arm 130.

The description of the corrugated portion 41 of the auxiliary barrier 40 has been given above. However, it should be noted that the characteristic of the reverse corrugated portion 43 can also be applied to the kitchen wall 50 unless otherwise specified. The corrugated portion 41 of the kitchen wall 50 is convex upward in the embodiment of the present invention. Alternatively, when the corrugated portion 41 of the kitchen wall 50 is convex downward, 43) may be required.

The reverse wrinkle portion can increase the surface rigidity of the wrinkle portion, thereby increasing the resistance due to the sloshing load. Deformation of the corrugated portion 51 may occur because the thermal stress as well as the sloshing impact of the liquid cargo are directly transmitted to the wall 50 of the kitchen. Hereinafter, the description will be made by way of example of the kitchen wall 50 to which the sloshing impact is directly transmitted.

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 damage the corrugated portion 51 of the cargo hold or the heat insulating panel assembly.

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. Particularly, the corrugated portion 51 of the kitchen wall 50 is protruded toward the storage space and may be vulnerable to sloshing shock because a space is formed therein.

Therefore, a method of inserting a reinforcing member (not shown) into the wrinkle portion to protect the wrinkle portion 51 from the sloshing impact has been proposed. 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.

The kitchen wall 50 according to the embodiment of the present invention may include a reverse wrinkle portion (not shown) in a direction opposite to the wrinkle portion 51 inside the wrinkle portion 51. [ When the corrugated portion 51 includes the reverse corrugated portion, the surface rigidity of the corrugated portion 51 increases, and the resistance of the kitchen wall 51 to the sloshing load increases as the surface rigidity increases.

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: outer wall, 11: mastic,
12: Stud bolt, 13: Level pad
20: lower insulation panel, 20a: through hole,
20b: foam plug, 21: lower first reinforcing panel,
21a: Through hole, 22: Lower second reinforcing panel,
22a, 22b: groove, 23: lower joint,
24: auxiliary barrier connecting member, 24a: rivet,
25: a panel fixing unit, 25a: a coupling portion,
25b: projecting member, 25c: rivet,
30: Upper insulation panel, 30a: Through hole,
30b: foam plug, 31: upper first reinforcing panel,
31a: through hole, 32: upper second reinforcing panel,
32a: groove, 33: upper joint,
34: Kitchen wall connecting member, 34a: Rivet,
35: barrier mounting member, 40: auxiliary barrier,
40a: through hole, 41: wrinkle portion,
42: intersection, 43, 44: reverse wrinkle,
50: a kitchen wall, 51: a wrinkle portion,
52: intersection, 100: jig for clamping,
110: main body, 120: support arm,
130: Clamping arm.

Claims (9)

To a barrier sheet used in a liquefied gas holding window to seal a heat insulating panel,
A flat portion and a corrugated portion in the out-of-plane direction in the flat portion,
The pleats
A first wrinkle portion arranged in a first direction, a second wrinkle portion arranged in a second direction different from the first direction, a second wrinkle portion arranged in a second direction different from the first direction, 2 < / RTI >
The first reverse folded portion provided in the first folded portion is arranged in the first direction,
The second reverse folds provided in the second folds are arranged in the second direction,
Wherein the inverted corrugation is used in a liquefied gas cargo hold provided between two adjacent intersections. The method according to claim 1,
Wherein a height from a floor of the wrinkle portion to a floor of the reverse wrinkle portion is equal to or smaller than a height from the flat portion to a floor of the wrinkle portion. delete delete The method according to claim 1,
Sectional shape in the direction perpendicular to the direction in which the wrinkles are arranged in the corrugated portion having the reverse corrugated portion is a quadratic curved shape. 6. The method of claim 5,
Sectional shape in the direction perpendicular to the direction in which the wrinkles are arranged in the corrugated portion having the inverted corrugated portion is an alphabetical " W " shape. The method according to claim 1,
Wherein the first wrinkle portion and the second wrinkle portion extend to an edge of the barrier sheet and the reverse wrinkle portion is used in a liquefied gas holding window provided inside the edge. 1. A liquefied gas holding window comprising a heat insulating panel for insulating a liquefied gas from the outside and a barrier for sealing the heat insulating panel,
Wherein the barrier is formed by connecting a plurality of barrier sheets,
Wherein the barrier sheet includes a flat portion and a corrugated portion in a out-of-plane direction in the flat portion,
Wherein the corrugation portion comprises a corrugated reverse corrugation portion in a direction opposite to the out-of-plane direction, a first corrugation portion arranged in a first direction, a second corrugation portion arranged in a second direction different from the first direction, Wherein the first and second corrugations intersect with each other,
The first reverse folded portion provided in the first folded portion is arranged in the first direction,
The second reverse folds provided in the second folds are arranged in the second direction,
Wherein the reverse wrinkle portion is provided between two adjacent intersections. 9. The method of claim 8,
Wherein the heat insulating panel includes a lower heat insulating panel and an upper heat insulating panel,
Wherein the barrier includes an auxiliary barrier sealing the lower insulating panel and provided with an auxiliary barrier sheet continuously connected thereto, and a main wall sealing the upper insulating panel, wherein the main wall is continuously connected with the main wall sheet,
The corrugated portion of the auxiliary barrier is corrugated downward toward the lower heat insulating panel and the reverse corrugated portion is corrugated upward toward the upper heat insulating panel,
Wherein a height from a floor of the corrugation to a floor of the reverse wrinkle portion is equal to or smaller than a height from the flat portion to a floor of the corrugation portion.

Images