JP2017527751A - Barrier sheet used in liquefied gas cargo hold, liquefied gas cargo hold using the same, and manufacturing method thereof - Google Patents

Abstract

A liquefied gas cargo hold including a barrier sheet for sealing a heat insulation panel and a heat insulation panel structure is disclosed. The barrier sheet according to the embodiment of the present invention is used in a liquefied gas cargo hold to seal a heat insulation panel, and is arranged in a second direction different from the first direction and the first wrinkle portion arranged in the first direction. Including a crossing portion where the second wrinkle portion, the first wrinkle portion and the second wrinkle portion intersect, and the first wrinkle portion is biased in any one direction when the barrier sheet is equally divided in the second direction, The two wrinkle portions are located in one direction more than when the barrier sheet is equally divided in the first direction.

Description

  The present invention relates to a barrier sheet used for a liquefied gas cargo hold, a liquefied gas cargo hold using the same, and a method for manufacturing the same, and more specifically, a barrier sheet used for a liquefied gas cargo hold that seals a heat insulating panel, and The present invention relates to a liquefied gas cargo hold including an insulating panel structure and a manufacturing method for manufacturing the same.

  Liquid gas (Liquid Gas) is a liquid that is cooled or compressed into a liquid, and the consumption of liquefied gas such as LNG (Liquid Natural Gas) and LPG (Liquid Petroleum Gas) is rapidly increasing worldwide. It is.

  A liquefied natural gas (LNG), which is an example of a liquefied gas, is a colorless and transparent ultra-low temperature liquid in which natural gas mainly composed of methane is cooled to −162 ° C. and its volume is reduced to one-sixth. In order to use liquefied natural gas in an ultra-low temperature state for energy, efficient transportation schemes that can be transported in large quantities from production bases to underwriters of customers have been studied. As part of these efforts, a liquefied natural gas transport vessel capable of transporting a large amount of liquefied natural gas by sea was developed.

  A LNG transport vessel must be equipped with a cargo hold (Cargo) that can store and store liquefied natural gas liquefied in an ultra-low temperature state. However, the conditions required for such a cargo hold are very detailed. There were difficulties.

  That is, since liquefied natural gas has a vapor pressure higher than atmospheric pressure and has a boiling temperature of approximately −162 ° C., in order to safely store and store such liquefied natural gas, the cargo for storing it is stored. The warehouse must be made of materials that can withstand ultra-low temperatures, such as aluminum steel, stainless steel, and 35% nickel steel, and has a unique thermal insulation panel structure that is resistant to thermal stress and shrinkage and prevents heat penetration. Must be designed. The cargo hold of such a liquefied natural gas transport ship can be classified into a self-supporting type and a membrane type according to its structure.

  When liquefied gas leaks into the heat insulation panel, the cargo hold may be damaged due to rapid volume expansion due to temperature increase. Therefore, a membrane barrier is provided to seal the liquefied gas from the heat insulation panel. Membrane barriers must be designed with thermal stress and sloshing impact in mind.

  As an example of the membrane system, Korean Published Patent Publication No. 10-2012-0013233 (2012.2.114.) Discloses a liquefied natural gas storage tank and a manufacturing method thereof.

  Korean Published Patent Publication No. 10-2012-0013233 (2012.2.14.)

  An embodiment of the present invention aims to provide a liquefied gas cargo hold that is easy to manufacture and can save costs.

  According to one aspect of the present invention, the present invention relates to a barrier sheet that is used in a liquefied gas cargo hold and seals a heat insulating panel, and a first wrinkle portion arranged in a first direction and a second direction different from the first direction. A second wrinkle portion that is arranged, and a crossing portion where the first wrinkle portion and the second wrinkle portion intersect, and the first wrinkle portion is any one from a center line that divides the barrier sheet in the second direction. It is possible to provide a barrier sheet used for a liquefied gas cargo hold that is biased in the direction.

  In addition, the second wrinkle portion may be located in any one direction from a center line that bisects the barrier sheet in the first direction.

  In addition, the first wrinkle portion and the second wrinkle portion are arranged in parallel to the corner of the barrier sheet, and the intersection portion has a distance to one corner and a distance to another corner facing each other so that they are different from each other. Can be provided.

  Further, the distance from the through hole to the first wrinkle portion closest to the through hole may be the same as the distance from the nearest second wrinkle portion.

  According to another aspect of the present invention, a liquefaction formed by a planar portion and a corner portion includes a main barrier wall that encloses a liquefied gas storage space, and a heat insulating panel assembly that surrounds the main barrier wall and insulates the liquefied gas from the outside. In a gas cargo hold, a plurality of heat insulation panel assemblies installed on the flat surface part are a plurality of lower heat insulation panels installed adjacent to each other; an auxiliary barrier layered on the lower heat insulation panel to seal the lower heat insulation panel; and A plurality of upper insulating panels stacked adjacent to each other on the auxiliary barrier and provided larger than the area in the width direction of the lower insulating panel; between the adjacent upper insulating panels installed on the plane portion The boundary may correspond to the boundary between the adjacent lower thermal insulation panels.

  Also, the lateral width of the upper thermal insulation panel may be provided as an integral multiple of the lateral width of the lower thermal insulation panel.

  Further, the lower heat insulation panel may be provided so that the horizontal width and the vertical width are the same.

  In addition, the heat insulation panel assembly installed in the corner portion includes a lower heat insulation panel and an upper heat insulation panel, and between the lower heat insulation panel installed in the flat portion and the lower heat insulation panel installed in the corner portion. An insertion heat insulation panel that fills a space widened by an installation error is inserted, and either one of the upper heat insulation panel installed in the corner portion or the upper heat insulation panel installed in the adjacent flat portion is the insertion heat insulation panel. It can be provided with a longer width.

  The auxiliary barrier wall includes a first wrinkle portion, a second wrinkle portion, and a crossing portion where the first wrinkle portion and the second wrinkle portion intersect each other. The first wrinkle portion and the second wrinkle portion are formed. A part may be accommodated between the borders of the adjacent lower insulation panels.

  In addition, a chamfer that accommodates the wrinkle portion may be formed at a corner of the lower heat insulation panel.

  In addition, the lower heat insulation panel and the upper heat insulation panel are disposed adjacent to each other in the first direction and the second direction, respectively, and the auxiliary barrier wall swells in the lower part and can be wrinkled. An auxiliary barrier sheet including an intersecting portion where the first wrinkle portion and the second wrinkle portion are continuously connected is provided, and a boundary between corners of the adjacent lower heat insulating panels is the first wrinkle portion or the second wrinkle portion. A point where the corners of the four adjacent lower heat insulating panels are adjacent to each other may be provided so as to correspond to the wrinkled part.

  The first wrinkle portion and the second wrinkle portion are accommodated at a boundary between the adjacent lower heat insulation panels, and the corners of the lower heat insulation panel are changed to accommodate the first wrinkle portion and the second wrinkle portion. Fur can be included.

  And a panel fixing unit that passes through the auxiliary barrier sheet and connects the lower heat insulating panel and the upper heat insulating panel, and an auxiliary barrier connecting member that is installed on the lower heat insulating panel and is connected to the auxiliary barrier sheet. The panel fixing unit may be installed at the center of the lower heat insulating panel, and the auxiliary barrier connecting member may be installed off the center of the lower heat insulating panel so as not to interfere with the panel fixing unit.

  Further, the auxiliary barrier connecting member is disposed in the first direction or the second direction, and the lower heat insulating panel is disposed in a lattice shape adjacent to the first direction and the second direction, and corresponds to a corner of the auxiliary barrier sheet. Thus, a liquefied gas cargo hold provided with the auxiliary barrier connecting member can be provided.

  According to still another aspect of the present invention, in the method for manufacturing a liquefied gas cargo hold by installing a heat insulating panel on a flat portion of an outer wall including a flat portion and a corner portion, the lower heat insulating panel is disposed on the flat portion in a first direction. Are arranged in a grid so as to be adjacent to each other in the second direction, an auxiliary barrier is installed on the lower heat insulating panel, and an upper heat insulating panel is stacked on the auxiliary barrier, but the upper heat insulating panel is the first Of the liquefied gas cargo hold, which is arranged in a grid so as to be adjacent to each other in the second direction, and a boundary between the adjacent upper thermal insulation panels corresponds to a boundary between the adjacent lower thermal insulation panels. A manufacturing method may be provided.

  Further, although the auxiliary barrier wall is installed by continuously connecting a plurality of auxiliary barrier sheets, any one of the auxiliary barrier sheets may be installed so as to straddle over the four lower heat insulating panels having corners adjacent to each other.

  In addition, although the upper thermal insulation panel is installed on the two adjacent lower thermal insulation panels, the corner of the upper thermal insulation panel may be installed to correspond to the corner of the outer portion of the two lower thermal insulation panels. .

  In addition, before installing the auxiliary barrier, an auxiliary barrier connecting member is installed on the lower heat insulating panel, and the auxiliary barrier is installed by continuously connecting a plurality of auxiliary barrier sheets. The corners may be fixed on the auxiliary barrier connecting member, and the corners of the adjacent auxiliary barrier connecting sheets may be overlapped and fixed on the auxiliary barrier sheet fixed to the auxiliary barrier connecting member.

  Further, the auxiliary barrier sheet and the auxiliary barrier connecting member are made of metal, and a fixing method between the auxiliary barrier sheet and a fixing between the auxiliary barrier sheet and the auxiliary barrier connecting member may be performed by a welding method.

  Further, before installing the auxiliary barrier, a panel fixing unit is installed on the lower heat insulating panel, and the auxiliary barrier is installed so that the protruding member of the panel fixing unit is accommodated in the through hole of the auxiliary barrier. The through hole and the panel fixing unit can be sealed.

  In addition, a lower heat insulation panel and an upper heat insulation panel are installed in the corner portion, and the heat insulation is inserted in a space widened by an installation error between the lower heat insulation panel installed in the flat portion and the lower heat insulation panel installed in the corner portion. A panel is inserted, and the upper thermal insulation panel provided longer than the previously installed upper thermal insulation panel by the width of the insertion thermal insulation panel can be installed adjacent to the upper thermal insulation panel installed at the corner portion. .

  In addition, the lower thermal insulation panel installed on the flat part is disposed adjacent to the lower thermal insulation panel of a certain size, and the upper thermal insulation panel installed on the planar part is of a certain size. An upper heat insulation panel is placed adjacent to the space, and an insertion heat insulation panel is inserted into a space widened by an installation error between the lower heat insulation panel installed at the corner and the lower heat insulation panel installed at the flat surface, and the constant An upper thermal insulation panel wider than the upper thermal insulation panel by the width of the insertion thermal insulation panel can be installed adjacent to the upper thermal insulation panel installed at the upper corner.

  Since the barrier sheet used for the liquefied gas cargo hold according to the embodiment of the present invention and the liquefied gas cargo hold using the same can be connected continuously with a single-shaped barrier sheet, it is easy to manufacture and cost-effective. You can save.

  In addition, it is possible to shorten the work period by minimizing the welding amount in installing the auxiliary barrier.

  Moreover, since the single-shaped lower heat insulation panel and the upper heat insulation panel can be connected continuously, manufacturing is easy and time and cost can be saved.

  In addition, since a heat insulating panel having a size and weight that can be manually installed by an operator is used, manufacturing is easy and time and cost can be saved.

  In addition, by installing using a single-shaped upper thermal insulation panel, it is possible to remove the adhesive fixing method used to secure the connection panel inserted between adjacent upper thermal insulation panels. Easy to manufacture and saves time and money.

The perspective view which showed a mode that it assembled partially in order to show the structure of the liquefied gas cargo hold which concerns on the Example of this invention. Sectional drawing which shows the structure of the liquefied gas cargo hold which concerns on the Example of this invention. The disassembled perspective view which shows a mode that the auxiliary barrier was combined. The top view which shows an auxiliary | assistant barrier sheet. The enlarged view of FIG. The perspective view which shows a mode that the one auxiliary barrier sheet was couple | bonded. The perspective view which shows a mode that four auxiliary barrier sheets were couple | bonded. Sectional drawing which shows a mode that an upper heat insulation panel was couple | bonded. The perspective view which shows a mode that the main barrier was combined. The 1st direction sectional view for showing signs that an upper heat insulation panel and a lower heat insulation panel are arranged. The 2nd direction sectional view for showing signs that an upper heat insulation panel and a lower heat insulation panel are arranged.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  The embodiments introduced below are provided as examples to sufficiently convey the idea of the present invention to those who have ordinary knowledge in the technical field to which the present invention belongs. The present invention is not limited to the embodiments described below, and can be embodied in other forms. In order to clearly describe the present invention, portions not related to the description are omitted in the drawings, and in the drawings, the width, length, thickness, and the like of the components may be exaggerated for convenience. Like reference numerals refer to like elements throughout the specification.

  The liquefied gas cargo hold according to the embodiment of the present invention may be used for storing and / or transporting ultra-low temperature liquefied gas. The liquefied gas is a liquid obtained by cooling or compressing a gas, and includes liquefied natural gas (LNG), liquefied petroleum gas (LPG), dimethyl ether (DME), and the like. .

  A liquefied gas cargo hold is a carrier that carries liquefied gas cargo such as an LNG carrier, an LNG RV (Regification Vessel) carrier, an LPG carrier, or an ethylene carrier, and an FSRU (Floating Storage Reregulation Unit), FPSO Offloading) or liquefied gas cargo such as BMPP (Barge Mounted Power Plant) is stored or produced, or it is applied to floating facilities with vaporization equipment. The liquefied gas cargo hold includes not only equipment installed on the sea but also equipment installed on land and used for storing or producing liquefied gas.

  Hereinafter, a membrane type cargo hold among the liquefied gas cargo holds will be described as an example. FIG. 1 is a perspective view showing a partially assembled structure for showing a structure of a liquefied gas cargo hold according to an embodiment of the present invention. FIG. 2 shows a structure of a liquefied gas cargo hold according to an embodiment of the present invention. It is sectional drawing shown.

  Referring to FIGS. 1 and 2, a liquefied gas cargo hold surrounds a space capable of containing liquefied gas, and a main barrier 50 that directly contacts the liquefied gas, and a heat insulating panel assembly that surrounds the main barrier 50 and insulates the liquefied gas from the outside. And an outer wall 10 that surrounds and firmly supports the thermal insulation panel assembly.

  The main barrier wall 50 is for sealing the storage space in which the storage fluid is accommodated, and is required to be airtight (or watertight). Since the liquefied gas may be maintained at an ultra-low temperature below the boiling point, it is usually stored in a liquid state. However, the liquefied gas may partially evaporate due to a change in temperature or pressure, and in this case, the pressure inside the cargo hold increases greatly. When the main barrier wall 50 permeates due to such an increase in pressure, liquid or gaseous liquefied gas may flow into the heat insulation panel assembly. The inflowing liquefied gas rapidly expands in volume as the temperature rises, damaging the thermal insulation panel assembly. Since cargo hold damage requires enormous time and money to repair, the tightness of the barrier is very important.

  The main barrier wall 50 may be made of a metal material such as Invar alloy (INVAR), stainless steel (SUS), or aluminum alloy so that the physical and chemical states can be maintained even in an ultra-low temperature state. The main barrier wall 50 may be formed by connecting a plurality of main barrier wall 50 sheets, and may be joined to each other to maintain airtightness.

  As a method of welding the main barrier wall 50, various welding methods used in related technical fields can be used, including lap welding or butt welding. It is also possible to use an automatic welding apparatus that uses a method such as laser welding or plasma welding in order to obtain uniform quality by reducing work deviation while improving welding quality. Since the above lap welding, butt welding, laser welding, plasma welding, and the like are techniques widely known in the related technical field, detailed description will be omitted.

  The main barrier 50 is exposed to sudden contraction and expansion because it is in direct contact with the cryogenic storage fluid. The main barrier wall 50 may be destroyed due to accumulated fatigue while the thermal contraction and thermal expansion are repeated, or the welded part may be damaged when the thermal contraction occurs and the airtightness may be impaired. Due to such a problem, the main barrier wall 50 includes a wrinkle portion 51 (corrugation) in order to have a low in-plane stiffness. The wrinkle portion 51 is elastically deformed in response to the thermal stress, thereby reducing the thermal stress at the welding site.

  The main barrier wall 50 includes a first wrinkle portion 51-1 and a second wrinkle portion 51-2 which are arranged in different directions, and an intersection portion 52 where both the wrinkle portions 51 intersect. The thermal stress acting in the in-plane direction of the main barrier wall 50 can be eliminated by the wrinkle portions 51 in two directions. That is, the thermal stress acting in the length direction of the first wrinkle portion 51-1 is eliminated by the stretchability of the second wrinkle portion 51-2, and the thermal stress acting in the length direction of the second wrinkle portion 51-2 is It can be eliminated by the elasticity of the first wrinkle 51-1.

  Although the two-way wrinkle portion 51 arranged vertically is shown in the drawing, the wrinkle portion in three or more directions can be included if necessary. As an example, the creases in the three directions can be arranged at an angle of 60 degrees with respect to each other.

  The heat insulation panel assembly includes a heat insulation panel assembly installed on a flat surface portion and a heat insulation panel assembly installed on a corner portion. The corner portion connects planar portions arranged at different angles, and includes a corner portion where two different heat insulating panels are connected, and a vertex portion where three different heat insulating panels are connected. Below, it demonstrates based on the heat insulation panel assembly installed in a plane part.

  The heat insulation panels 20 and 30 are generally made of a lightweight material with excellent heat insulation performance, such as polyurethane foam (PUF) or reinforced polyurethane foam (R-PUF). In addition, the storage fluid can be insulated from the outside and maintained in an ultra-low temperature state. In general, the heat insulation panel assembly includes a double heat insulation structure including an upper heat insulation panel 30 and a lower heat insulation panel 20 for the purpose of improving heat insulation performance and facilitating repair.

  An inner hull may be used for the outer wall 10 to support the load of the storage fluid. A lower heat insulation panel 20 may be fixed to the outer wall 10.

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

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

  The auxiliary barrier 40 uses a metal material such as Invar alloy (INVAR), stainless steel (SUS), or aluminum alloy in the same manner as the main barrier 50, or uses a rigid triplex and a triple triplex. Can be used.

  Depending on the method of joining the auxiliary barrier 40 to the lower insulation panel 20, an adhesive manufacturing method and a welding manufacturing method are used. Although not shown in the drawings, in the adhesive manufacturing method, a rigid triplex is attached to the lower heat insulating panel 20 using an adhesive such as epoxy glue, and adjacent rigid triplexes are connected by a sample triplex. Finishing can be completed. At this time, the supple triplex can also be attached onto the rigid triplex by the adhesive.

  The liquefied gas cargo hold according to the embodiment of the present invention uses a welded manufacturing method in which adjacent auxiliary barriers 40 are joined by welding. In the welded manufacturing method shown in the drawing, the auxiliary barrier 40 is mechanically connected to the lower insulating panel 20 instead of being bonded and bonded, and the upper insulating panel 30 is also bonded to the auxiliary barrier 40 and bonded to the lower insulating panel 40 instead of being bonded. Mechanically coupled to the panel 20.

  Hereinafter, a liquefied gas cargo hold and a manufacturing method thereof according to an embodiment of the present invention will be described. The following description refers to FIGS. FIG. 3 is an exploded perspective view showing a state in which the auxiliary barrier is coupled, FIG. 4 is a plan view showing the auxiliary barrier sheet, FIG. 5 is an enlarged view of FIG. 3, and FIGS. 6 and 7 are auxiliary barrier sheets. It is a perspective view which shows a mode that these are couple | bonded. FIG. 8 is a cross-sectional view showing a state in which the upper heat insulating panel is joined, and FIG. 9 is a perspective view showing a state in which the main barrier is joined.

  First, the installation process of the lower heat insulation panel 20 is demonstrated.

  The lower heat insulation panel 20 may be coupled to the outer wall 10 through a lower first reinforcement panel 21 bonded to the bottom surface. A stud bolt 12 for joining the lower heat insulation panel 20 may be welded to the outer wall 10. Further, through holes 20 a and 21 a are formed in the lower heat insulation panel 20 and the lower first reinforcement panel 21 so that the stud bolt 12 can be penetrated. At this time, the diameter of the through hole 21 a formed in the lower first reinforcing panel 21 may be smaller than the diameter of the through hole 20 a formed in the lower heat insulating panel 20.

  The stud bolt 12 is inserted into a through hole 20 a formed at a corner portion of the lower heat insulation panel 20 and is coupled to a nut. The nut is coupled to the stud bolt 12 to restrain the lower first reinforcing panel 21. As a result, the lower heat insulating panel 20 to which the lower first reinforcing panel 21 is attached is coupled to the outer wall 10. At this time, a foam plug 20b can be inserted into the through hole 20a in order to maintain heat insulation performance.

  Further, between the lower first reinforcing panel 21 and the outer wall 10, a mastic having a bonding force and / or a level pad 13 for adjusting a step can be interposed. In particular, since the mastic 11 has adhesive force and elasticity at the same time, the outer wall 10 and the lower heat insulation panel 20 can be coupled and the shock transmitted between them can be reduced.

  The plurality of lower heat insulation panels 20 can be arranged adjacent to each other, and can be arranged in a grid as an example. Arranging in a lattice form means that the lower heat insulation panel 20 is disposed not only adjacent to the first direction (x-axis direction) but also adjacent to the second direction (y-axis direction). Means.

  A lower joint 23 may be inserted between adjacent lower heat insulation panels 20. The lower joint 23 may be a heat insulating material that can fill a gap between the lower heat insulating panels 20, and glass wool or the like may be used. The lower joint 23 may be inserted after the lower heat insulation panel 20 is installed, or may be installed in a state of being attached to the side of the lower heat insulation panel 20.

  Next, the process of installing the auxiliary barrier 40 on the lower heat insulation panel 20 will be described.

  A lower second reinforcing panel 22 may be stacked on the lower heat insulating panel 20 to install the auxiliary barrier 40. The lower second reinforcing panel 22 may use plywood or the like, and may be attached to the lower thermal insulation panel 20 using an adhesive such as epoxy glue.

  An auxiliary barrier connecting member 24 may be provided on the upper portion of the lower heat insulation panel 20. In particular, 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 is made of a metal material such as SUS and can be welded to the auxiliary barrier 40, and can be mechanically connected to the lower second reinforcing panel 22 by a rivet 24a or the like. The auxiliary barrier connecting member 24 may be accommodated in a groove 22 a formed in the lower second reinforcing panel 22 so as not to protrude from the upper surface of the lower second reinforcing panel 22.

  In addition, the auxiliary barrier connecting member 24 may be provided in a strip shape, and may be arranged in different directions to form an intersection. As an example, it may be provided in a strip shape in two directions orthogonal to each other. The auxiliary barrier connecting member 24 may be provided in parallel to the corner of the lower heat insulating panel 20 facing each other. Further, the auxiliary barrier connecting member 24 may be provided as a single strip or may be provided so that several strips are connected continuously.

  A panel fixing unit 25 for fixing the upper heat insulating panel 30 may be provided on the lower heat 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 a coupling portion 25a that is mechanically coupled to the lower second reinforcing panel 22 by a rivet 25c and the like, and a projecting member 25b that projects from the coupling portion 25a and is coupled to the upper heat insulating panel 30. Can do. The panel fixing unit 25 is accommodated in a groove 22 b formed in the lower second reinforcing panel 22 and can not protrude from the upper surface of the lower second reinforcing panel 22.

  The lower heat insulation panel 20 may have a square shape when seen in a plan view, and is preferably heavy and large enough to allow an operator to work manually. If the lower insulation panel 20 is large and heavy, it must be operated using mechanical equipment, which increases the cost and time required for the manufacturing process. Moreover, in the case of the lower heat insulation panel 20, since it is common to work in the state in which the mastic 11 was adhered to the bottom surface, when using mechanical equipment, the efficiency may be lowered.

  As an example, the lower thermal insulation panel 20 according to an embodiment of the present invention may use a reinforced polyurethane foam (R-PUF) having a size of about 1000 mm * 1000 mm, but may have a weight of about 20 kg. Therefore, two workers can work manually using a vacuum gripper or the like.

  The auxiliary barrier connecting member 24 is connected to the adjacent auxiliary barrier connecting member 24 (including one connected by a virtual extension line without being directly connected) to form one closed figure. In FIG. 1, eight lower heat insulating panels 20 are arranged adjacent to each other, and a rectangular closed figure is formed by an auxiliary barrier connecting member 24 provided on the lower heat 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 auxiliary barrier 40 sheet may be arranged and fixed so as to overlap the auxiliary barrier connecting member 24. As an example, the auxiliary barrier 40 sheet may be fixed to the auxiliary barrier connecting member 24 by a tack welding method.

  At this time, a through hole 40a through which the protruding member 25b of the panel fixing unit 25 can pass is formed in the auxiliary barrier 40 sheet. After the installation of the auxiliary barrier 40 is completed, the through hole 40a and the panel fixing unit 25 are finished by welding in order to ensure the airtightness of the auxiliary barrier 40.

  After one auxiliary barrier 40 sheet is fixed, another auxiliary barrier 40 sheet may be fixed to one adjacent side surface. At this time, one or more corners of the auxiliary barrier 40 sheet adjacent to the preinstalled auxiliary barrier 40 sheet are arranged so as to overlap the preinstalled auxiliary barrier 40 sheet, and the other corners are connected to the auxiliary barrier 40 sheet. It can be placed and fixed on the member 24. As an example, a tack welding method may be used for fixing the auxiliary barrier 40 sheet and the auxiliary barrier 40 sheet and fixing the auxiliary barrier 40 sheet and the auxiliary barrier connecting member 24.

  The installation process is continuously performed to fix all the auxiliary barrier 40 sheets on the lower heat insulation panel 20. However, since only the tack welding is performed between adjacent auxiliary barrier 40 sheets, permanent welding must be performed in order to maintain airtightness.

  Both corners of the adjacent auxiliary barrier 40 sheets are permanently welded by lap welding or butt welding, thereby ensuring airtightness. At this time, various welding methods used in related technical fields can be used. In addition, an automatic welding apparatus using a method such as laser welding or plasma welding can be used in order to obtain uniform quality by reducing work deviation while improving welding quality. Since the above lap welding, butt welding, laser welding, or plasma welding is a technique widely known in the related technical field, detailed description thereof will be omitted.

  On the other hand, the auxiliary barrier connecting member 24 is positioned below the weld line (or weld core) when welding the adjacent auxiliary barrier 40 sheets, thereby preventing the auxiliary barrier 40 sheet from being deformed by welding heat. it can. In particular, when plasma welding is used, it is possible to prevent deformation of the auxiliary barrier 40 sheet that may be generated by high heat. At this time, welding heat is transmitted to the auxiliary barrier connecting member 24 in the process of lap welding or butt welding the auxiliary barrier 40 sheets to each other so that the lower auxiliary barrier connecting member 24 and the auxiliary barrier 40 sheet located on the upper auxiliary barrier connecting member 24 are mutually connected. Sometimes it is welded.

  Since the upper heat insulation panel 30 is located between the auxiliary barrier 40 and the stored fluid, even if thermal deformation does not occur as much as the main barrier 50, some thermal deformation is unavoidable. In the case of an adhesive manufacturing method that actually bonds and joins the auxiliary barrier and the lower insulation panel, a problem has been reported in which the adhesive surface with the lower insulation panel is stressed due to shrinkage and expansion of the auxiliary barrier, resulting in poor adhesion quality. It is also done.

  The auxiliary barrier 40 may include a wrinkle portion 41 (corrugation) because it has a low in-plane stiffness. The wrinkle portion 41 reduces the thermal stress at the welded portion by elastically deforming its shape corresponding to the thermal stress.

  The auxiliary barrier 40 includes a first wrinkle portion 41-1 and a second wrinkle portion 41-2 that are arranged in different directions, and an intersecting portion 42 where both the wrinkle portions 41 intersect. Thermal stress acting in the in-plane direction of the auxiliary barrier 40 can be eliminated by the wrinkle portion 41 in two directions. That is, the thermal stress acting in the length direction of the first wrinkle portion 41-1 is eliminated by the stretchability of the second wrinkle portion 41-2, and the thermal stress acting in the length direction of the second wrinkle portion 41-2 is It can be eliminated by the stretchability of the first wrinkle portion (41-1).

  Although the two-way wrinkle portion 41 arranged vertically is shown in the drawing, the wrinkle portion in three or more directions can be included if necessary. As an example, the creases in the three directions can be arranged at an angle of 60 degrees with respect to each other.

  The wrinkle portion 41 provided on the auxiliary barrier 40 can bulge downward toward the lower heat insulation panel 20 and can be positioned at the boundary between two adjacent lower heat insulation panels 20. At this time, a chamfer is formed at the upper corner of the lower heat insulation panel 20 so that the wrinkle portion 41 can be accommodated, and interference with the wrinkle portion 41 can be avoided.

  The auxiliary barrier 40 sheet may be provided so as to straddle the plurality of lower heat insulating panels 20. The meaning of straddling the lower heat insulation panel 20 includes a case where it is completely covered and a case where only a part is covered. As an example, the drawing shows that one auxiliary barrier 40 sheet is provided so as to straddle the eight lower heat insulation panels 20.

  On the other hand, the corners of the auxiliary barrier 40 sheet are mounted so as to deviate from the center line of the lower heat insulation panel 20. The corners of the auxiliary barrier 40 sheet must be welded to the corners of the auxiliary barrier connecting member 24 and / or the adjacent auxiliary barrier 40 sheet so that they do not overlap with the panel fixing unit 25 located at the center of the lower insulating panel 20. Because. As described above, 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 protruding member 25b penetrates the auxiliary barrier 40 sheet.

  The length (L) of one side of the auxiliary barrier 40 sheet is the number (n-1) obtained by subtracting one from the number (n) of the lower insulating panel 20 covered by the auxiliary barrier 40 sheet. It may be slightly larger than that multiplied by (D). The exact side length (L) of the auxiliary barrier 40 sheet can be determined by the distance between the adjacent lower heat insulation panels 20 and the overlapping distance when the auxiliary barrier 40 sheet is lap welded. In the drawing, when the length of one side of the lower heat insulating panel 20 is a, the length of the long side of the auxiliary barrier 40 is slightly larger than 3a, and the length of the small side is slightly larger than a.

  The auxiliary barrier 40 sheet is provided with a crease 41 accommodated at the boundary between the lower heat insulation panels 20. The wrinkle portion 41 can be formed by a press method or the like. In the drawing, three wrinkle portions are formed on the long side of the auxiliary barrier 40 and one wrinkle portion is formed on the small side.

  Hereinafter, the auxiliary barrier 40 sheet will be described in more detail with reference to FIG. On the other hand, the main features of the auxiliary barrier 40 sheet described below can be applied to the main barrier 50 sheet as it is.

  The auxiliary barrier 40 sheet has a first wrinkle portion 41-1 arranged in the first direction, a second wrinkle portion 41-2 arranged in the second direction, a first wrinkle portion 41-1 and a second wrinkle portion 41-. It includes an intersection 42 where 2 intersect.

  The auxiliary barrier 40 sheet shown in FIG. 4 has three first wrinkle portions 41-1: 41-1a, 41-1b, 41-1c arranged in the first direction, and 1 arranged in the second direction. Pieces of second wrinkle portions 41-2.

  On the other hand, when the virtual first direction center line (P) extended in the first direction so as to divide the auxiliary barrier 40 sheet in both directions in the second direction is compared with the first wrinkle portion 41-1, the first wrinkle portion A virtual second direction center 41-1 is located in any one direction from the first direction center line (P) and extends in the second direction so as to divide the auxiliary barrier 40 sheet into both directions in the first direction. When comparing the line (Q) and the second wrinkle part 41-2, the second wrinkle part 41-2 may be located in any one direction from the second direction center line (Q).

  The second wrinkle portion 41-2 may be positioned so as to be biased in any one direction while being parallel to the second direction center line (Q). Therefore, the distance from the center of the second wrinkle portion 41-2 to the upper and lower corners is different from each other.

  The first wrinkle portion 41-1 can be positioned so as to be biased in any one direction while being parallel to the first direction center line (P). Therefore, the distance from the center of the first wrinkle portion 41-1 to the left and right corners is different from each other. On the other hand, the distance (d1) between the three first wrinkle portions 41-1a, 41-1b, 41-1c may be provided to be constant. At this time, the distance (d2) from the center of the first wrinkle portion 41-1a located on the left side to the left corner and the distance (d3) from the center of the first wrinkle portion 41-1c located on the right side to the right corner Can be different from each other.

  Also, the sum of the distance (d2) from the center of the first wrinkle portion 41-1a on the left side to the left corner and the distance (d3) from the center of the first wrinkle portion 41-1c on the right side to the right corner is It may be the same as the distance (d1) between the centers of the adjacent first wrinkle portions 41-1a, 41-1b, and 41-1c. At this time, when connecting adjacent auxiliary barrier 40 sheets, the distance from the center of the first wrinkle portion 41-1a located on the left side to the left corner (in consideration of the fact that they are connected so as to overlap each other at a fixed interval ( It is reasonable to measure d2) with an interval that overlaps. FIG. 4 shows a bent portion that is bent so that the auxiliary barrier 40 sheet can overlap the vicinity of the left corner (see FIG. 3), and the left corner from the center of the first wrinkle portion 41-1a located on the left side. It can be seen that the measurement was performed by subtracting the overlapping interval when measuring the distance (d2) until.

  On the other hand, the distance from the first wrinkle portion 41-1, the second wrinkle portion 41-2, or the intersecting portion 42 to any one corner of the auxiliary barrier 40 sheet and the distance to the other corner facing each other are provided to be different from each other. Can be.

  The 1st wrinkle part 41-1 and the 2nd wrinkle part 41-2 of the auxiliary barrier 40 sheet | seat are installed so that it may be accommodated in the boundary of the adjacent lower heat insulation panel 20. As shown in FIG. At this time, the first wrinkle portion 41-1 and the second wrinkle portion 41-2 of the auxiliary barrier 40 sheet are disposed so as to be biased in one direction and are arranged across the plurality of lower heat insulation panels 20, and are adjacent to each other in the same shape. This is because the auxiliary barrier 40 sheet is continuously installed to install the auxiliary barrier 40.

  Moreover, since the panel fixing unit 25 is located in the center part of the lower heat insulation panel 20, the auxiliary barrier 40 sheet is located in one direction of the lower heat insulation panel 20 while avoiding interference with the panel fixing unit 25. . As described above, the corners of the auxiliary barrier 40 sheet are positioned on the auxiliary barrier 40 connecting member 24.

  The distance from the through hole 40b through which the protruding member 25b of the panel fixing unit 25 passes is closest to the first wrinkle portion 41-1 and the second wrinkle portion 41-2. This is because the panel fixing unit 25 is located at the center of the lower heat insulation panel 20.

  In summary, the wrinkle portion 41 corresponding to the boundary between the lower heat insulation panels 20 covered by the auxiliary barrier 40 sheet is formed in the auxiliary barrier 40 sheet, and the intersecting portion 42 is defined with reference to the center of one side of the sheet. It is biased in the direction. Accordingly, the through hole 40a through which the protruding member 25b penetrates is also located in the opposite direction with respect to the center of one side of the sheet.

  Among the features detailed above, the panel fixing unit 25 is located at the center of the lower heat insulating panel 20, and the auxiliary barrier connecting member 24 is located parallel to the corner of the lower heat insulating panel 20. 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 lower heat insulating panels 20; Although the auxiliary barrier 40 is provided with a wrinkle portion 41 accommodated at the boundary between the adjacent lower heat insulation panels 20, the first wrinkle portion 41-1 and the second wrinkle portion 41- are formed at a portion where the four lower heat insulation panels 20 meet. 2 is provided, and the auxiliary barrier 40 is provided with a through hole 40a through which the protruding member 25b of the panel fixing unit 25 can pass. It facilitates fabrication that is, a feature which can shorten the production time.

  The lower first reinforcing panel 21 and the lower second reinforcing panel 22 are stacked according to the above-described features, and a plurality of lower heat insulating panels 20 in which the auxiliary barrier connecting member 24 and the panel fixing unit 25 are installed are installed on the outer wall 10. Since a plurality of auxiliary barrier 40 sheets can be fixed to the auxiliary barrier connecting member 24 and installed by welding the auxiliary barrier 40 sheets, the manufacturing process becomes very easy and simple. At this time, the convenience of manufacture can be increased also in the point that the sheet | seat provided in the mutually same shape can be used for the auxiliary | assistant barrier 40 sheet | seat.

  An automatic welding apparatus can be used for the permanent welding of the auxiliary barrier 40 sheet and the auxiliary barrier 40 sheet. In particular, an automatic welding apparatus can be used for welding of the wrinkled portion of the auxiliary barrier 40. At this time, in order to weld the auxiliary barrier 40 sheet having a small thickness and the auxiliary barrier 40 sheet manually, or to use the automatic welding apparatus, the two auxiliary barrier 40 sheets are brought into close contact with each other. Fit-up work is required. In particular, when using an automatic welding apparatus, fit-up work is important.

  The fit-up operation can be performed by a fit-up jig (Fit-Up Zig, not shown) fixedly installed on the lower heat insulation panel 20. The fit-up jig can be coupled to the projecting member 25b projecting to the panel fixing unit 25 or can be fixed on the auxiliary barrier 40 sheet by a suction type.

  The operator can bring the two auxiliary barrier 40 sheets into close contact with each other by pushing the auxiliary barrier 40 sheet covered thereon using the fit-up jig or lifting the auxiliary barrier 40 sheet laid below. At this time, in order to lift the auxiliary barrier 40 sheet laid below, an adsorption method, an adhesion method, or the like can be used.

  Usually, after fitting up the auxiliary barrier 40 sheet, tack welding is performed to fix the two auxiliary barrier 40 sheets together. The auxiliary barrier 40 sheets fixed to each other are easily welded by an automatic welding device. Particularly in the case of a wrinkle portion including a curved portion, an elaborate fit-up operation is required in order to improve the welding quality by the automatic welding apparatus.

  The automatic welding apparatus performs welding while moving along a rail installed so as to be fixed to the lower heat insulating panel 20. Therefore, in order to use an automatic welding apparatus, the operation | work which fixes and installs a rail around a welding line is required.

  In the method of manufacturing the liquefied gas cargo hold according to the embodiment of the present invention, the rail can be fixedly installed using the panel fixing unit 25 for fixing the lower heat insulating panel 20 and the upper heat insulating panel 30. As described above, the protruding member 25b that protrudes to fix the upper heat insulating panel 30 to the panel fixing unit 25 can be installed. The rail of the automatic welding apparatus may be coupled and fixed to the protruding member 25b of the panel fixing unit 25, and may be coupled to a coupling member (not shown) having a different shape provided separately in the panel fixing unit 25.

  Referring to FIG. 1, the panel fixing unit 25 may be provided at the center of the lower heat insulating panel 20, and the auxiliary barrier connecting member 24 may be provided at the side of the panel fixing unit 25. On the other hand, unlike the drawings, the auxiliary barrier connecting member 24 and the panel fixing unit 25 may contact each other without being separated.

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

  In the above description, there is a description that the auxiliary barrier 40 sheet is tack welded to the auxiliary barrier connecting member 24 and the adjacent auxiliary barrier 40 sheets are tack welded and fixed. When the main welding is performed along a line (welding line) where the two auxiliary barrier 40 sheets overlap or abut, the installation of the auxiliary barrier is completed. Rails can be installed near the weld line so that the automatic welding device can move along the weld line. At this time, when the rail and the welding line are provided in parallel, the welding quality can be improved and the working time can be shortened.

  The rail 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, the panel fixing unit 25 and the auxiliary barrier connecting member 24 are installed adjacent to each other, whereby the automatic welding apparatus installed on the rail can facilitate the work of performing welding along the weld line. After the automatic welding is completed, the rail is disassembled from the panel fixing unit 25.

  As described above, the through hole 40a is formed in the auxiliary barrier 40 sheet so that the protruding member 25b of the panel fixing unit 25 penetrates. 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 and the panel fixing unit 25 must be welded, and arc welding can be performed along the shape of the through hole 40a. .

  When the welding of the auxiliary barrier 40 is completed, a process of inspecting whether airtightness is ensured is performed. As an inspection process, a method of injecting an inspection gas between the auxiliary barrier 40 and the lower heat insulation panel 20 to check whether the inspection gas leaks to the outside can be used. When the inspection gas is detected outside as a result of the inspection, it is determined that the welded state of the portion is defective and re-welding is performed. On the other hand, if it is determined that the airtightness is secured as a result of the inspection, the process proceeds to the next process of installing the upper heat insulating panel 30.

  Next, a process of installing the upper heat insulation panel 30 will be described.

  The plurality of upper heat insulating panels 30 can be arranged adjacent to each other, and can be arranged in a grid as an example. Arranging in a lattice means that the upper heat insulating panel 30 is not only disposed adjacent to the first direction but also adjacent to the second direction.

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

  If the distance between the lower heat insulation panels 20 is ignored (generally very narrow), the upper heat insulation panel 30 may be provided in a shape that is approximately an integral multiple of the lower heat insulation panel 20. In this case, the corners of the upper heat insulation panel 30 coincide with the boundaries between the lower heat insulation panels 20. Therefore, since the upper heat insulation panel 30 can be installed similarly to the installation process of the lower heat insulation panel 20, the convenience of manufacture increases.

  In the event that the corner of the upper heat insulation panel 30 does not coincide with the boundary of the lower heat insulation panel 20 and the upper heat insulation panel 30 is fixed to the lower heat insulation panel 20, This is because a connecting panel (not shown) must be inserted into the gap between the two, and at this time, the connecting panel is fixed by adhesion, which causes a disadvantage in manufacturing.

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

  Through holes 30a and 31a are formed in the upper heat insulating panel 30 and the upper first reinforcing panel 31 so that the protruding member 25b can be penetrated. At this time, the diameter of the through hole 31 a formed in the upper first reinforcing panel 31 may be smaller than the diameter of the through hole 30 a formed in the upper heat insulating panel 30.

  In addition, the diameter of the through hole 31a formed in the upper first reinforcing panel 31 may be a size corresponding to the diameter of the protruding member 25b. This is to prevent the upper first reinforcing panel 31 from moving relative to the protruding member 25b.

  The projecting member 25b is inserted into a pair of through holes 30a formed in the central portion of the upper heat insulating panel 30 and coupled to the nut. The nut constrains the upper first reinforcing panel 31 by coupling to the projecting member 25b. As a result, the upper heat insulating panel 30 to which the upper first reinforcing panel 31 is attached is coupled to the lower heat insulating panel 20. At this time, the foam plug 30b can be inserted into the through hole 30a in order to maintain the heat insulating performance.

  The upper heat insulation panel 30 may be provided in a size and shape corresponding to the area where the two lower heat insulation panels 20 are disposed adjacent to each other. As an example, when the lower heat insulation panel 20 having a regular square (1 × 1) is provided in plan view as shown in the drawing, the length of one side of the upper heat insulation panel 30 is the length of the other side in plan view. Can be provided as a rectangle (1 × 2) that is twice as large as It goes without saying that the ratio of the shape and length of the specific heat insulating panels 20 and 30 can be changed depending on circumstances.

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

  If the shape and size of the upper heat insulation panel 30 is the same as that of the lower heat insulation panel 20, unlike the drawing, the upper heat insulation panel 30 can be separated from the upper heat insulation panel 30 by one panel fixing unit 25 located in the center. The lower heat insulation panels 20 are fixed to each other. However, in this case, the upper heat insulating panel 30 is allowed to rotate on the lower heat insulating panel 20.

  If the upper insulating panel 30 is allowed to rotate, inconvenience may occur in the manufacturing process. In particular, when the upper heat insulation panel 30 is installed on the side or ceiling, the upper heat insulation panel 30 rotates unintentionally, and efforts and time may be required to align them. Further, by allowing the upper heat insulating panel 30 to rotate, stress may be generated between the adjacent upper heat insulating panels 30, thereby reducing the durability of the cargo hold. Further, stress concentrates on the main barrier wall 20 fixed to the upper heat insulating panel 30, and there is a risk that damage may occur in the welded part.

  In the above, an example in which two or more lower heat insulation panels 20 are coupled to one upper heat insulation panel 30 to prevent the rotation of the upper heat insulation panel 30 has been described as an example. Although 30 and the one lower heat insulation panel 20 couple | bond together, the case where the panel fixing unit 25 is provided with two or more can be included.

  An upper second reinforcing panel 32 may be stacked on the upper heat insulating panel 30 to install the main barrier 50. The upper second reinforcing panel 32 may use plywood or the like, and may be attached to the upper heat insulating panel 30 using an adhesive such as epoxy glue.

  A main barrier connecting member 34 may be provided on the upper insulating panel 12. In particular, when the upper second reinforcing panel 32 is provided, the main barrier connecting member 34 can be coupled to the upper surface of the upper second reinforcing panel 32. The main barrier connecting member 34 is made of a metal material such as SUS and can be welded to the main barrier 50 and mechanically connected to the upper second reinforcing panel 32 by a rivet 34a or the like. The main barrier wall connecting member 34 is accommodated in a groove 32 a 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 main barrier connecting member 34 may be provided in a strip shape, and may be arranged in different directions to form an intersection. As an example, it may be provided in a strip shape in two directions orthogonal to each other. The main barrier connecting member 34 may be provided in parallel to the corner of the upper heat insulating panel 30 facing each other. In addition, the main barrier connecting member 34 may be provided as one strip or may be provided so that several strips are connected continuously.

  A barrier installation member 35 for installing the main barrier 50 may be provided on the upper heat insulation panel 30. In particular, when the main barrier connection member 34 is provided, the barrier installation member 35 may be provided on the upper portion of the main barrier connection member 34.

  In the above description, in order to weld the auxiliary barrier 40 sheet using the automatic welding apparatus, the rail must be installed, and the rail is installed in the panel fixing unit 25. Similarly, in order to weld the main barrier 50 sheet using an automatic welding apparatus, a barrier installation member 35 on which a rail can be installed is necessary.

  The barrier installation member 35 may be a stud bolt provided at an intersection where the two main barrier connection members 34 perpendicular to each other meet. The barrier installation member 35 may be welded onto the main barrier coupling member 34. The intersection where the two-way main barrier connecting members 34 provided with the barrier installation member 35 meet may be a four-sheet intersection where four main barrier 50 sheets meet around. When the corner portion of the main barrier wall 50 sheet is chamfered, even if four main barrier wall 50 sheets are welded and installed around the barrier wall installation member 35, they can not interfere with the barrier wall installation member 35. At this time, the corner portion of the main barrier wall 50 sheet must be hermetically sealed by being welded to the main barrier wall connecting member 34.

  The barrier installation member 35 is for installing the main barrier 50 and can be removed when the installation of the main barrier 50 is completed. This is because an operator may be handled as an obstacle when moving.

  Next, a process of installing the main barrier 50 will be described.

  The main barrier connecting member 34 is connected to the adjacent main barrier connecting member 34 (including not being directly connected but connected by a virtual extension line) to form one closed figure. In FIG. 1, four upper heat insulating panels 30 are arranged adjacent to each other, and a rectangular closed figure is formed by a main barrier connecting member 34 provided on the upper heat insulating panel 30.

  One main barrier wall 50 sheet constituting the main barrier wall 50 may have a shape corresponding to the shape of a closed figure formed by the main barrier wall connecting member 34, and the squares of the main barrier wall 50 sheet are respectively connected to the main barrier wall 50. It may be disposed and fixed so as to overlap the member 34. As an example, the main barrier 50 sheet may be fixed to the main barrier connecting member 34 by a tack welding method.

  After one main barrier wall 50 sheet is fixed, another main barrier wall 50 sheet can be fixed to one adjacent side surface. At this time, one of the squares of the main barrier 50 sheet adjacent to the preinstalled main barrier 50 sheet is arranged so as to overlap the preinstalled main barrier 50 sheet, and the other triangle is the main barrier connecting member 34. It can be placed and fixed on top. As an example, a tack welding method may be used for fixing the main barrier 50 sheet and the main barrier 50 sheet and fixing the main barrier 50 sheet and the main barrier connecting member 34.

  The installation process is continuously performed to fix all the main barrier 50 sheets on the upper heat insulation panel 30. However, since only the tack welding is performed between the adjacent main barrier 50 sheets, permanent welding must be performed in order to maintain airtightness.

  Both corners of the adjacent main barrier 50 sheets are permanently welded by lap welding or butt welding, thereby ensuring airtightness. At this time, as a welding method that can be used, it is needless to say that a method used for welding the auxiliary barrier can be used, and an automatic welding apparatus can also be used.

  On the other hand, the main barrier connecting member 34 is positioned below the weld line (or weld core) when welding the adjacent main barrier 50 sheets, thereby preventing the main barrier 50 sheet from being deformed by welding heat. it can. In particular, when plasma welding is used, it is possible to prevent deformation of the main barrier 50 sheet that may be generated by high heat. At this time, in the process of lap welding or butt welding the main barrier wall 50 sheets, welding heat is transmitted to the main barrier wall connecting member 34 so that the lower main barrier wall connecting member 34 and the main barrier wall 50 sheet located above the lower main barrier wall connecting member 34 are mutually connected. Sometimes it is welded.

  Automatic welding equipment can be used for the main welding of the main barrier 50 sheet and the main barrier 50 sheet. In particular, an automatic welding apparatus can also be used for welding the wrinkled portion of the main barrier 50. At this time, in order to weld the main barrier 50 sheet having a small thickness and the main barrier 50 sheet, and the operator proceeds welding manually or uses an automatic welding apparatus, the two main barrier 50 sheets are brought into close contact with each other. Fit-up work is required. In particular, when using an automatic welding apparatus, fit-up work is important.

  Since the fit-up operation can use the same method as the process of installing the auxiliary barrier 40, detailed description is omitted. A fit-up jig (not shown) can be coupled to a barrier installation member 35 installed on the main barrier connection member 34 or can be fixed on the main barrier 50 sheet by an adsorption method.

  The automatic welding apparatus performs welding while moving along a rail installed so as to be fixed to the upper heat insulating panel 30. Therefore, in order to use an automatic welding apparatus, the operation | work which fixes and installs a rail around a welding line is required.

  In the method of manufacturing the liquefied gas cargo hold according to the embodiment of the present invention, the rail can be fixedly installed using the barrier installation member 35 (as an example, a stud bolt) installed on the main barrier coupling member 34.

  Next, a method for welding the main barrier 50 sheet using the automatic welding apparatus will be described.

  In the above description, it has been described that the main barrier wall 50 sheet is tack welded to the main barrier wall connecting member 34 and the adjacent main barrier wall 50 sheets are tack welded and fixed. When the main welding is performed along a line (welding line) where the two main barrier 50 sheets overlap or abut, the installation of the main barrier is completed. Rails can be installed near the weld line so that the automatic welding device can move along the weld line. At this time, when the rail and the welding line are provided in parallel, the welding quality can be improved and the working time can be shortened.

  The rail is fixed to a plurality of barrier installation members 25 arranged in one direction and installed parallel to the welding line, so that the automatic welding apparatus installed on the rail can easily carry out welding along the welding line. can do. After the automatic welding is completed, the rail is disassembled from the barrier installation member 25.

  When the welding of the main barrier 50 is completed, a process of inspecting whether airtightness is ensured is performed. In the inspection process, a method may be used in which an inspection gas is injected between the main barrier wall 50 and the upper heat insulation panel 30 to check whether the inspection gas leaks to the outside. When the inspection gas is detected outside as a result of the inspection, it is determined that the welded state of the portion is defective and re-welding is performed.

  Next, the manufacturing method of the cargo hold which concerns on the Example of this invention with reference to FIG. 10 and FIG. 11 is demonstrated. FIG. 10 is a first direction cross-sectional view for illustrating a state in which the upper heat insulation panel 30 and the lower heat insulation panel 30 are disposed, and FIG. 11 is a second view for illustrating a state in which the upper heat insulation panel 30 and the lower heat insulation panel 20 are disposed. FIG.

  The outer wall 10 on which the heat insulating panel assembly is installed includes a plane portion (P) and a corner portion (C). Below, the heat insulation panel assembly installed in a plane part (P) is demonstrated.

  The lower heat insulation panel 20 may be fixed to a stud bolt 12 installed in advance on the outer wall 10. The lower heat insulation panel 20 may be installed with the lower first reinforcing panel 21 bonded to the bottom and the lower second reinforcing panel 22 bonded to the upper. The lower heat insulation panel 20 may have a substantially quadrangular prism shape, and a through hole 20a for coupling the stud bolt 12 may be formed in the square.

  The lower heat insulation panel 20 may be continuously installed adjacent to the first direction and the second direction. Further, the lower heat insulation panels 20 may be arranged in a lattice shape so as not to be mixed with each other. Therefore, the boundary of the adjacent lower heat insulation panel 20 can be connected continuously.

  The lower heat insulation panel 20 may have a square cross-sectional shape in the width direction. That is, the horizontal width and the vertical width can be the same. Therefore, the operator can install the lower heat insulation panel 20 regardless of the direction of the lower heat insulation panel 20. Also, the lower thermal insulation panel 20 may be provided in a single shape and size that are prefabricated. By using the standardized lower insulation panel 20, the convenience of manufacturing can be increased.

  The mastic 11 may be attached to the bottom of the lower first reinforcing panel 21, and the auxiliary barrier connecting member 24 and the panel fixing unit 25 may be installed on the upper portion of the lower second reinforcing panel 22. Therefore, the installation process of the lower heat insulation panel 20 can be completed simply by placing the pre-manufactured lower heat insulation panel 20 on the outer wall 10 and connecting it to the stud bolt 12, thereby simplifying the production process.

  The lower heat insulation panel 20 installed in the corner part (C) is manufactured so as to correspond to the shape of the corner part. A gap space (G) is generated between the lower thermal insulation panel 20 installed in the corner (C) and the lower thermal insulation panel 20 installed in the flat part (P) arranged adjacent to the lower thermal insulation panel 20 due to an installation error. there's a possibility that. An insertion heat insulating panel 26 can be inserted into the gap space (G). The inserted heat insulating panel 26 may not require a separate reinforcing panel, and may be fixed by press fitting or by adhesion.

  After the installation of the lower heat insulation panel 20 is completed, the auxiliary barrier 40 can be installed on the lower heat insulation panel 20. The auxiliary barrier 40 may be formed by continuously connecting a plurality of auxiliary barrier 40 sheets.

  One auxiliary barrier 40 sheet can cover the plurality of lower heat insulation panels 20. Preferably, it may be installed so as to cover four lower heat insulation panels 20 whose apexes are adjacent to one intersection. Further, the length of one side of the auxiliary barrier 40 sheet may be longer than the horizontal or vertical length of the lower heat insulation panel 20.

  As an example, as shown in FIG. 3, one auxiliary barrier 40 sheet may be installed across two lower heat insulation panels 20 in the first direction and four lower heat insulation panels 20 in the second direction. At this time, the length of the side in the first direction of the auxiliary barrier 40 sheet may be slightly longer than the length of the side in the width direction of the lower heat insulation panel 20, and the length of the side in the second direction is the width direction of the lower heat insulation panel 20. It may be slightly longer than 3 times the side length. The side length of the auxiliary barrier 40 sheet is provided a little longer because the lap welding can be used to join adjacent auxiliary barrier 40 sheets and the installation convenience when installing the adjacent lower heat insulating panel 20 is improved. This is because it can be installed with a slight gap space.

  The auxiliary barrier 40 sheet may be manufactured in a single shape and size, and may be installed so as to be continuously connected in the first direction and the second direction. However, in order to connect with the auxiliary barrier 40 installed in the corner (C), an auxiliary barrier 40 sheet manufactured in a separate size can be used.

  A panel fixing unit 25 may be provided at the center of the lower heat insulation panel 20. In order to simplify the manufacturing process, only one panel fixing unit 25 may be provided in one lower insulating panel 20, and the panel fixing unit 25 may prevent an imbalance of stress due to external force when coupled with the upper insulating panel 30. It can be located at the center of the lower heat insulation panel 20.

  On the other hand, a through hole 40a through which the protruding member 25b of the panel fixing unit 25 passes is formed in the auxiliary barrier 40 sheet. After the auxiliary barrier 40 sheet is installed, the auxiliary barrier 40 sheet is provided along the through hole 40a in order to maintain the airtightness of the auxiliary barrier 40. The panel fixing unit 25 can be welded and finished.

  The auxiliary barrier connecting member 24 may be disposed along the first direction and the second direction so as to correspond to the corners of the auxiliary barrier 40 sheet. In order to avoid interference with the panel fixing unit 25, the auxiliary barrier connecting member 24 may be disposed in any one direction from the center line (including the horizontal center line and the vertical center line) of the lower heat insulation panel 20.

  The upper heat insulating panel 30 may be fixedly coupled to the panel fixing unit 25. The upper heat insulating panel 30 may be installed with the upper first reinforcing panel 31 bonded to the bottom and the upper second reinforcing panel 32 bonded to the upper. The upper heat insulating panel 30 can be formed in a substantially quadrangular prism shape, and a through hole 30a for coupling with the panel fixing unit 25 can be formed at the center line.

  The upper heat insulation panel 30 may be continuously installed adjacent to the first direction and the second direction. Further, the upper heat insulating panels 30 may be arranged in a lattice shape so as not to be mixed with each other. Therefore, the boundary of the adjacent upper heat insulation panel 30 can be connected continuously.

  The width of the upper heat insulation panel 30 may be provided as an integral multiple of the width of the lower heat insulation panel 20. That is, the horizontal width and vertical width of the upper heat insulation panel 30 can be selected as an integer multiple of the horizontal width or vertical width of the lower heat insulation panel 20.

  As an example, FIG. 1 illustrates that the upper heat insulating panel 30 is provided with a rectangular shape in the same width direction as the widthwise sectional shape when two lower heat insulating panels 20 are continuously arranged. That is, the ratio of the horizontal width and the vertical width of the lower heat insulation panel 20 may be provided at a ratio of 1: 1, and the ratio of the horizontal width and the vertical width of the upper heat insulation panel 30 may be provided at a ratio of 1: 2. However, the length of the upper insulating panel 30 in the width direction may be provided longer in consideration of the length of the gap between the adjacent lower insulating panels 20.

  In addition, the upper thermal insulation panel 30 may be provided in a single shape and size manufactured in advance. By using the standardized upper insulation panel 30, the convenience of fabrication can be increased.

  A boundary between adjacent upper thermal insulation panels 30 may be provided to correspond to a boundary between adjacent lower thermal insulation panels 20. As an example, FIG. 1 illustrates the case where the corners of the upper heat insulating panel 30 correspond to the corners of the outer portions of two adjacent lower heat insulating panels 20. Here, the corner of the outer portion means a corner excluding the boundary between the two lower heat insulating panels 20.

  In the above description, it has been described that one panel fixing unit 25 can be installed in one lower heat insulating panel 20. Therefore, the upper heat insulation panel 30 combined with the two lower heat insulation panels 20 is combined with the two panel fixing units. Moreover, since the panel fixing unit 25 can be provided in the center part of the lower heat insulation panel 20, the through hole 30a of the upper heat insulation panel 30 can be provided on the center line.

  The main barrier wall connecting member 34 and the barrier wall installation member 35 may be installed on the upper portion of the upper second reinforcing panel 32. Accordingly, the pre-manufactured upper heat insulation panel 30 is disposed on the lower heat insulation panel 20 and the process of installing the upper heat insulation panel 30 is completed only by the process of coupling with the panel fixing unit 25, thereby simplifying the production process.

  The upper heat insulation panel 30 installed in the corner part (C) is manufactured so as to correspond to the shape of the corner part (C). Should the upper heat insulation panel 30 standardized to the upper heat insulation panel 30 installed in the plane part (P) arranged to be adjacent to the upper heat insulation panel 30 installed in the corner part (C), There is a possibility that a gap space (G) is generated between the two upper heat insulation panels 30 due to an installation error. In the above, the insertion heat insulation panel 26 can be inserted between the lower heat insulation panel 20 installed in the corner part (C) and the lower heat insulation panel 20 installed in the plane part (P) arranged adjacent to the lower heat insulation panel 20. I explained that. At this time, the width of the gap space (G) is calculated in advance for manufacturing the insertion heat insulating panel 26.

  The upper thermal insulation panel 30 installed in the plane part (P) arranged so as to be adjacent to the upper thermal insulation panel 30 installed in the corner part (C) is longer than the standard length of the upper thermal insulation panel 30 in the width direction. It is possible to use the upper heat insulating panel 30 which is manufactured to be longer than the insertion heat insulating panel 26 in the width direction. As with the lower heat insulation panel 20, the rigidity and durability of the upper heat insulation panel 30 to which the sloshing load acts directly can be maintained by not using the separate insertion heat insulation panel 26.

  After the installation of the upper heat insulation panel 30 is completed, the main barrier wall 50 may be installed on the upper heat insulation panel 30. The main barrier wall 50 may be formed by continuously connecting a plurality of main barrier wall 50 sheets.

  One main barrier 50 sheet can cover a plurality of upper heat insulation panels 30. Preferably, it may be installed so as to cover four upper thermal insulation panels 30 whose apexes are adjacent to one intersection. Further, the length of one side of the main barrier wall 50 sheet may be longer than the horizontal or vertical length of the upper heat insulating panel 30.

  As an example, as shown in FIG. 1, one main barrier wall 50 sheet may be installed so as to straddle two upper heat insulation panels 30 in the first direction and the second direction, respectively. At this time, the length of the side in the first direction of the main barrier wall 50 sheet may be slightly longer than the length of the side in the first direction width direction of the upper heat insulation panel 30, and the length of the side in the second direction is the upper heat insulation panel 30. It may be slightly longer than the length of the side in the width direction. The reason why the side length of the main barrier wall 50 sheet is a little longer is that the lap welding can be used to join the adjacent main barrier wall 50 sheets and the installation convenience when installing the adjacent upper heat insulating panel 30 is improved. This is because it can be installed with a slight gap space.

  The main barrier wall 50 sheet may be manufactured in a single shape and size, and may be installed so as to be continuously connected in the first direction and the second direction. However, in order to connect with the main barrier wall 50 installed in the corner portion (C), a main barrier wall 50 sheet manufactured in a separate size can be used.

  The main barrier connecting member 34 may be disposed along the first direction and the second direction so as to correspond to the corners of the main barrier 50 sheet. In order to avoid interference with the through-holes 30a, the main barrier wall connecting member 34 is a virtual center line extending in the second direction by connecting the center points of the upper heat insulation panel 30 in the second direction (the center points of the corners in the first direction in the drawing). Line) and can be arranged in any one direction. However, since the through hole 30a is not provided on the center line in the first direction, there is no problem that the main barrier connecting member 34 disposed in the first direction is provided so as to coincide with the center line in the first direction.

  Although the present invention has been described with reference to an exemplary embodiment illustrated in the accompanying drawings, this is merely illustrative, and a variety of those having ordinary skill in the art will now appreciate. It will be understood that variations and other equivalent embodiments are possible. Accordingly, the true scope of the present invention should be determined only by the appended claims.

10: outer wall 11: mastic 12: stud bolt 13: level pad 20: lower heat insulating panel 20a: through hole 20b: foam plug 21: lower first reinforcing panel 21a: through hole 22: lower second reinforcing panels 22a, 22b: groove 23: Lower joint 24: Auxiliary barrier connecting member 24a: Rivet 25: Panel fixing unit 25a: Connecting portion 25b: Protruding member 25c: Rivet 30: Upper heat insulating 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: Main barrier connecting member 34a: Rivet 35: Wall installation member 40: Auxiliary barrier 40a: Through hole 41: Wrinkle portion 42: Intersection 50: Main Barrier 51: Wrinkle 52: Intersection

Claims (22)

In the barrier sheet that is used in the liquefied gas cargo hold and seals the insulation panel,
A first wrinkle portion arranged in a first direction, a second wrinkle portion arranged in a second direction different from the first direction, and a crossing portion where the first wrinkle portion and the second wrinkle portion intersect,
The said 1st wrinkle part is a barrier sheet used for a liquefied gas cargo hold located in any one direction from the center line which divides the said barrier sheet into the said 2nd direction.   2. The barrier sheet used for a liquefied gas cargo hold according to claim 1, wherein the second wrinkle portion is located in any one direction from a center line that bisects the barrier sheet in the first direction. The first wrinkle portion and the second wrinkle portion are arranged in parallel to the corners of the barrier sheet,
The barrier sheet used for a liquefied gas cargo hold according to claim 2, wherein the intersection is provided such that the distance to any one of the corners and the distance to the other corner facing each other are different from each other. Further including a through hole,
The barrier sheet used for the liquefied gas cargo hold according to claim 2, wherein a distance from the through hole to the nearest first wrinkle portion is the same as a distance from the nearest second wrinkle portion. In a liquefied gas cargo hold formed by a plane part and a corner part, including a main barrier wall that surrounds the liquefied gas storage space and a heat insulating panel assembly that surrounds the main barrier wall and insulates the liquefied gas from the outside.
The heat insulation panel assembly installed on the flat part is:
Lower thermal insulation panels installed adjacent to each other;
An auxiliary barrier layer that is stacked on the lower heat insulating panel and seals the lower heat insulating panel; and a plurality of upper barrier layers that are stacked on the auxiliary barrier wall and disposed adjacent to each other and are larger than the area in the width direction of the lower heat insulating panel. An insulation panel;
A liquefied gas cargo hold in which a boundary between adjacent upper heat insulation panels installed in the flat portion corresponds to a boundary between the adjacent lower heat insulation panels.   The liquefied gas cargo hold according to claim 5, wherein a width of the upper heat insulation panel is provided as an integral multiple of a width of the lower heat insulation panel.   The liquefied gas cargo hold according to claim 5, wherein the lower heat insulation panel is provided so that the horizontal width and the vertical width are the same. The heat insulation panel assembly installed in the corner portion includes a lower heat insulation panel and an upper heat insulation panel,
Between the lower heat insulation panel installed in the flat part and the lower heat insulation panel installed in the corner part, an insertion heat insulation panel is inserted that fills a space widened by an installation error,
6. The liquefied gas according to claim 5, wherein one of the upper heat insulating panel installed in the corner portion and the upper heat insulating panel installed in the adjacent flat portion is provided longer than the insertion heat insulating panel. Cargo hold. The auxiliary barrier includes a first wrinkle portion and a second wrinkle portion that can swell and wrinkle at a lower portion, and an intersecting portion where the first wrinkle portion and the second wrinkle portion intersect,
The liquefied gas cargo hold according to claim 5, wherein the first wrinkle portion and the second wrinkle portion are accommodated between boundaries of the adjacent lower heat insulating panels.   The liquefied gas cargo hold according to claim 9, wherein a chamfer for accommodating the wrinkle portion is formed at a corner of the lower heat insulation panel. The lower thermal insulation panel and the upper thermal insulation panel are disposed adjacent to each other in the first direction and the second direction, respectively.
The auxiliary barrier wall is provided by continuously connecting auxiliary barrier sheets including a first wrinkle portion and a second wrinkle portion that swell and crease at a lower portion, and an intersection portion where the first wrinkle portion and the second wrinkle portion intersect. ,
A boundary between corners of the adjacent lower heat insulation panels is provided so as to correspond to the first wrinkle portion or the second wrinkle portion, and a point where corners of the four adjacent lower heat insulation panels are adjacent is the intersection. The liquefied gas cargo hold of Claim 5 provided corresponding to a part. The first wrinkle portion and the second wrinkle portion are accommodated at a boundary between the adjacent lower heat insulating panels,
The liquefied gas cargo hold according to claim 11, wherein a corner of the lower heat insulation panel includes a chamfer so as to accommodate the first wrinkle portion and the second wrinkle portion. A panel fixing unit that penetrates the auxiliary barrier sheet and connects the lower heat insulation panel and the upper heat insulation panel;
An auxiliary barrier connecting member installed on the lower insulating panel and coupled to the auxiliary barrier sheet;
The panel fixing unit is installed at the center of the lower heat insulation panel,
The liquefied gas cargo hold according to claim 11, wherein the auxiliary barrier connecting member is installed off the center of the lower heat insulation panel so as not to interfere with the panel fixing unit.   The auxiliary barrier connecting member is disposed in the first direction or the second direction, and the lower heat insulating panel is disposed in a lattice shape adjacent to the first direction and the second direction so as to correspond to the corners of the auxiliary barrier sheet. The liquefied gas cargo hold according to claim 13, wherein the auxiliary barrier connecting member is provided. In the method of manufacturing a liquefied gas cargo hold by installing a heat insulating panel on the flat portion of the outer wall including the flat portion and the corner portion,
The lower heat insulation panel is arranged in a lattice shape so as to be adjacent to the first direction and the second direction in the plane portion, and installed.
An auxiliary barrier is installed on the lower insulation panel,
Although the upper thermal insulation panel is laminated on the auxiliary barrier, the upper thermal insulation panel is arranged in a lattice shape so as to be adjacent to each other in the first direction and the second direction, and a boundary between the adjacent upper thermal insulation panels is adjacent to the adjacent barrier wall. A method for producing a liquefied gas cargo hold, which is arranged so as to correspond to a boundary between lower thermal insulation panels.   The auxiliary barrier sheet is installed by continuously connecting a plurality of auxiliary barrier sheets, but any one auxiliary barrier sheet is installed so as to straddle four lower heat insulating panels having corners adjacent to each other. 15. A method for producing a liquefied gas cargo hold according to 15.   The upper thermal insulation panel is installed on the two adjacent lower thermal insulation panels, but the corner of the upper thermal insulation panel is installed to correspond to the corner of the outer part of the two lower thermal insulation panels. Item 16. A method for producing a liquefied gas cargo hold according to Item 15. Before installing the auxiliary barrier, install an auxiliary barrier connecting member on the lower heat insulation panel,
Although the auxiliary barrier wall is installed by continuously connecting a plurality of auxiliary barrier sheets, the corners of the auxiliary barrier sheet are fixed on the auxiliary barrier connecting member, and the corners of the adjacent auxiliary barrier sheets are connected to the auxiliary barrier sheet. The method for producing a liquefied gas cargo hold according to claim 15, wherein the liquefied gas cargo hold is fixed while overlapping on the auxiliary barrier sheet fixed to a member.   The auxiliary barrier sheet and the auxiliary barrier connecting member are made of metal, and fixing between the auxiliary barrier sheet and fixing between the auxiliary barrier sheet and the auxiliary barrier connecting member is performed using a welding method. The manufacturing method of the liquefied gas cargo hold described in 2. Before installing the auxiliary barrier, install a panel fixing unit on the lower insulation panel,
The liquefied gas cargo hold according to claim 15, wherein the auxiliary barrier is installed such that a protruding member of the panel fixing unit is accommodated in a through hole of the auxiliary barrier, and the through hole and the panel fixing unit are sealed. Production method. Install a lower insulation panel and an upper insulation panel at the corner,
Insert the inserted heat insulation panel into the space that has spread by the installation error between the lower heat insulation panel installed in the flat part and the lower heat insulation panel installed in the corner part,
The liquefaction according to claim 15, wherein the upper heat insulating panel provided longer than the pre-installed upper heat insulating panel by the width of the insertion heat insulating panel is installed adjacent to the upper heat insulating panel installed at the corner portion. Gas cargo hold manufacturing method. The installation of the lower heat insulation panel installed in the flat portion is arranged adjacent to the lower heat insulation panel of a certain size,
The installation of the upper heat insulation panel installed on the flat surface portion is arranged adjacent to the upper heat insulation panel of a certain size,
Insert the heat insulating panel inserted into the space spread by the installation error between the lower heat insulating panel installed in the corner part and the lower heat insulating panel installed in the flat part,
The liquefied gas cargo according to claim 15, wherein an upper thermal insulation panel wider than the upper thermal insulation panel of a certain size by a width of the insertion thermal insulation panel is installed adjacent to an upper thermal insulation panel installed at an upper corner portion. Production method of the storehouse.

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