JP2006300320A - Module for manufacturing storage tank for liquefied natural gas and tank utilizing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquefied gas storage tank capable of minimizing the loss of a liquefied natural gas due to vaporization by simplifying the tank for storing the liquefied natural gas in the form of a liquid in an ultra low temperature state, shortening an assembling step, maintaining advanced liquid tightness, and easily eliminating stress due to mechanical deformation in a module for manufacturing the liquefied natural gas storage tank and the tank utilizing the module. <P>SOLUTION: In this heat insulating module used for the liquefied natural gas storage tank, its lower end part is projected to easily assemble parts between the modules adjacent to each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a storage tank for liquefied natural gas installed in structures such as ships and land tanks and vehicles, and a method for manufacturing the same, and more particularly, to store liquid liquefied natural gas in an ultra-low temperature state. A module used in a storage tank for liquefied natural gas, which can reduce the stress caused by mechanical deformation more easily while reducing the conventional assembly process and maintaining high liquid-tightness by simplifying the tank structure This relates to a storage tank for liquefied natural gas using

  Generally, liquefied natural gas (Liquefied Natural Gas, LNG) is a liquefied form of natural gas, a fossil fuel, and storage tanks for liquefied natural gas are installed on the ground depending on where they are installed. They are sorted into land-based storage tanks that are landfilled or mobile storage tanks that are installed in transportation means such as automobiles and ships.

  Since the above-mentioned liquefied natural gas has a risk of explosion due to impact, it is stored in an ultra-low temperature state. Therefore, the storage tank for storing the liquefied natural gas has a structure that maintains a high degree of impact resistance and liquid tightness. is doing. In such storage tanks, the structure of liquefied natural gas storage tanks installed in automobiles and ships that are more fluid than terrestrial storage tanks with little flow is devised in preparation for mechanical stress due to flow. There is a slight difference in that you have to do. However, since the storage tank of liquefied natural gas installed in a ship whose countermeasures have been devised in preparation for mechanical stress can naturally be used as a land-type storage tank, the specification of the present invention includes The structure of the liquefied natural gas storage tank installed will be described as an example.

  First, liquefied natural gas (LNG) storage tanks installed inside LNG carriers can be divided into independent tank types and membrane types. This is a classification based on whether the load of cargo acts directly on the insulation, and the specific contents are as follows.

  In the following (Table 1), the so-called GTT NO 96-2 type and GTT Mark III type are 1995 Gaz Transport (GT) and Technigaz (TGZ) to GTT (Gaztransport & Technigaz) Since the names were changed, the GT type was renamed GTT NO 96-2 and the TGZ type was renamed GTT Mark III.

  The structure of the GT and TGZ tanks described above is as follows: US Pat. No. 6,035,795 (Patent Document 1), US 6,378,722 (Patent Document 2), US 5,586,513 (Patent Document 3), US Patent It is described in the publication US2003-0000949 (patent document 4), Korean patent publications KR2000-0011347 (patent document 5), KR2000-0011346 (patent document 6) and the like.

Classification of LNG storage tanks

  GTT's membrane-type LNG wire is manufactured by Cofferdam to avoid the dangers associated with mechanical / thermal properties between cargo tanks and cargo tanks when the insulation and hull are directly loaded. The air temperature inside these Cofferdams must be maintained at + 5 ° C or higher to prevent the low temperature brittleness of the hull plate on the Cofferdam side. For this purpose, a heating means such as a heating coil is installed to generally use a heat source such as steam or hot water. Installation of insulation material is completed by first installing the scaffolding on the hull, and then installing and installing the scaffolding material and the insulation box and membrane (Membrane) completed on the land in the Access House. . In the case of a spherical tank, the pre-launch work period is long, whereas the membrane system has a long period after launch.

  The NO 96-2 type of GTT membrane type uses Invar steel (36% Ni) with a thickness of 0.5 to 0.7 mm as shown in FIGS. The primary sealing wall (10) and the secondary sealing wall (15) maintain almost the same liquid tightness and strength, and when the primary sealing wall (10) leaks, the secondary sealing wall (15) only has a long period of time. Can keep the cargo safe. The GTT NO 96-2 type sealing wall (10, 15) has a straight membrane, so it is easier to weld and has a higher automation rate than the Mark III type corrugated membrane. GTT NO 96-2 is longer.

  Furthermore, the biggest difference between the existing GT type and the currently used GTT NO 96-2 type is Double Couple (instead of the U type bar (Bar) that supports the insulation box (insulation walls, 11 and 16). 17). The functions of the main parts of the GTT NO 96-2 LNG wire storage tank for the heat insulation cross section are as shown in (Table 2).

The main part of the heat-insulation section of GTT NO 96-2 storage tank

  On the other hand, GTT's Mark III type is a stainless steel membrane with a corrugated thickness of 1.2mm at the primary sealing wall (20) as shown in Figs. Since it is absorbed by the wrinkles of the part, a large stress is hardly generated in the membrane. Moreover, Glass Wool, Triplex, etc. are used as a material of a heat insulation wall (21, 26). The Mark III type has primary and secondary insulation walls (Insulation, 21 and 26) processed on land and mounted in one piece, so the box type primary and secondary insulation walls (21 and 26) must be installed respectively. The construction is relatively easy compared to GTT NO 96-2 type.

  The functions of the main parts related to the heat insulation cross section of the storage tank of GTT Mark III type LNG wire are as follows (Table 3).

The main part of the heat insulation section of the Mark III storage tank

  An important part of the GTT NO 96-2 type storage tank and the GTT Mark III type storage tank having the above-described structure is the corner part structure.

  Here, the corner part (Corner Part) in the storage tank of liquefied natural gas is an area where the load due to thermal deformation of each sealing wall (membrane) constituting the storage tank acts asymmetrically, and such asymmetric load is distributed. It must be structured structurally so that the stress generated from the storage tank can be eliminated.

  As a recent technology related to the corner portion in such an LNG storage tank, “Liquid-tightness having a corner structure improved as a tank installed in a ship support structure” started in Korean Patent Publication KR2000-0011347. And an insulation tank ”.

  As shown in FIG. 5, the structure of the corner portion started in the above-mentioned KR2000-0011347 is a pre-assembled composite at the 90 ° angle part formed by the hull inner surface (1) and the transverse bulkhead (2). The girder (30) is fixed, and the composite girder (30) has a built-in reinforcing wave (39, dotted line portion) formed in a hard W-shaped metal figure (31) at regular intervals. It consists of an insulating material (40).

  In these types of pre-assembled composite girder (30), the inner surface (1) of the hull and the part facing the transverse bulkhead (2) are respectively fixed by means of a polymer resin (34), and both branch surfaces are as described above. It is mechanically attached to the bearing structure of the hull by fixing means (32, 33) respectively supported by the transverse bulkhead (2) and the double hull inner surface (1).

  In addition, the bottom of the pre-assembled composite girder (30) has a gradient (42) so that a drainage space (41) is provided at a 90 ° angle where the hull inner surface (1) and the transverse bulkhead (2) are in contact. )It has become.

  The technology for assembling the corner of the LNG storage tank using the pre-assembled composite girder (30) described above is a relatively simple structure without damaging the double bulkhead paint body at a low installation cost. Although it has the effect of improving the resistance of the sealing wall due to mechanical shock, the pre-assembled composite girder (30), which is the basic unit constituting the corner of the storage tank, is made of a hard metal figure (31 ), So that the above-mentioned metal figure (31) is fixed to the hull inner surface (1) and the horizontal bulkhead (2) by manual fixing means (32, 33, bolt-nut). Assembling work is not ready.

  The structure of the corner portion of the membrane-type LNG storage tank described above is that the pre-assembled composite girder (30), which is a basic unit constituting the corner portion of the storage tank, has a hull inner surface (1) and a transverse bulkhead (2 ), And a stress concentration phenomenon occurs in the corner portion because a partial stress can be generated in the hull during the operation of the hull or due to waves. For this reason, efforts have been made to improve stress concentration for several decades, and further sustained improvement is necessary. In addition to the concentration of stress, continuous improvements have been made to reduce BOG (Boil-Off Gas), which is a loss due to vaporization of ultra-low temperature liquid LNG, simplification of the structure, and simplification of the manufacturing process.

United States Patent US 6,035,795 US6,378,722 US 5,586,513 United States Patent Publication US2003-000049 Republic of Korea Patent Publication KR2000-0011347 Republic of Korea Patent Publication KR2000-0011346

  The above-mentioned Membrane type liquefied natural gas storage tank is based on the reduction of BOG, which is the loss due to vaporization of ultra-low temperature liquid liquefied natural gas, simplification of the structure of complicated heat insulating and sealing walls, and simplification of the manufacturing process Improvement efforts have been made over several decades in terms of reducing the drying period of the tank and relieving stress at the corners and sealing walls of the tank, but there is a need for further improvement.

  Accordingly, the present invention seeks to improve the above-mentioned problems by inventing a membrane-type liquefied natural gas storage tank having a new structure different from the conventional membrane-type liquefied natural gas storage tank.

  In addition, a plurality of heat insulating walls are provided on the bottom surface of the conventional LNG storage tank, and each planar structure is fixed by an anchor structure. By the way, when the ship moves, the hull is deformed by waves and sloshing of the load, and mechanical stress is generated on the above-mentioned heat insulation wall. Technology development is underway.

  Therefore, the present invention proposes a membrane-type LNG storage tank with a new structure different from the conventional membrane-type LNG storage tank, which simplifies the assembly structure and manufacturing process and shortens the drying period of the tank. A new structure of liquefied natural gas storage tank and its manufacturing method for more efficiently relieving thermal / mechanical stress generated from storage and discharge of liquefied natural gas stored in storage tank The purpose is to provide.

  The present invention includes, for example, the following aspects.

  [1] As a heat insulation module used in a liquefied natural gas storage tank, the lower end protrudes to facilitate assembly between adjacent modules, for producing a liquefied natural gas storage tank Modules.

[2] The module includes a primary heat insulating wall;
A secondary sealing wall adhered to the lower portion of the primary heat insulating wall with an adhesive;
The module for manufacturing a storage tank for liquefied natural gas according to claim 1, wherein the module is composed of a secondary heat insulating wall bonded to the lower part of the secondary sealing wall with an adhesive.

  [3] The storage of liquefied natural gas according to [1], wherein the module is configured by a large number of planar structures positioned at a planar portion of the tank and a large number of corner structures positioned at a corner portion. Module for tank production.

  [4] The liquefied natural gas storage tank manufacturing method according to [3], wherein the planar structure forms a quadrangular prism, and one or more corner portions are partially cut. module.

[5] The module includes a primary heat insulating wall;
An upper plate attached to the upper part of the primary heat insulating wall;
A secondary sealing wall attached to a lower portion of the primary heat insulating wall;
A secondary heat insulating wall attached to a lower portion of the secondary sealing wall;
It consists of a lower plate attached to the lower part of the secondary heat insulating wall,
The module for manufacturing a liquefied natural gas storage tank according to [1], wherein the lower plate member is extended at one or more side surfaces of the secondary heat insulating wall to form a flange.

  [6] The module for producing a storage tank for a liquefied natural gas according to [5], wherein the primary or secondary heat insulating wall, the sealing wall, and a portion where the upper and lower plate members are in contact are bonded with an adhesive. .

  [7] The module for producing a liquefied natural gas storage tank according to [6], wherein the secondary sealing wall protrudes from one or more side surfaces of the primary and secondary heat insulation walls.

  [8] The module for manufacturing a storage tank for liquefied natural gas according to [7], wherein the secondary sealing wall is liquid-tightly connected to each other.

  [9] The module for producing a liquefied natural gas storage tank according to [8], wherein the heat insulating wall is polyurethane foam.

[10] Including two continuous sealing walls and two heat insulating walls, the primary sealing wall is in direct contact with the liquefied natural gas stored in the storage tank, and the primary heat insulating wall is provided below the primary sealing wall. In a liquefied natural gas storage tank arranged in the procedure of the secondary sealing wall and the secondary insulation wall,
The primary sealing wall is supported by an anchor portion mechanically fastened to the bottom surface of the tank,
It consists of many modules as described in one item of the above [1] to [9], and each of the modules is at least one of the primary sealing wall and the tank bottom surface between the primary sealing wall and the tank bottom surface. A storage tank for liquefied natural gas, which is installed so that it can be slid.

  [11] The storage tank for liquefied natural gas according to [10], wherein the module is manufactured in a preliminary assembly and is assembled based on the anchor portion to constitute a heat insulation system.

  [12] The storage tank for liquefied natural gas according to [11], wherein the primary sealing wall is fastened to an upper end portion of the anchor portion by welding.

  [13] The liquefied natural gas storage tank according to [12], wherein an upper end portion of the anchor portion is an end of an anchor support load installed in the anchor portion or an anchor upper cap fastened to the anchor support load. .

[14] The secondary sealing wall is extended to a side space formed by the heat insulating wall,
The end of the extended secondary sealing wall is fastened by an upper fixing plate and a lower fixing plate,
The liquefied natural gas storage tank according to [13], wherein the fastening surfaces of the upper fixing plate and the lower fixing plate include a groove formed so that an end of the secondary sealing wall can be inserted.

[15] A corner structure located at a corner inside the tank;
A module positioned for sliding movement on a plane inside the tank;
The liquefied natural gas storage tank according to [10], further comprising an anchor structure that is fastened to a bottom surface of the tank and attaches the module to the inside of the tank.

  [16] The module is a pre-assembly in which a flat secondary heat insulating wall, a flat secondary sealing wall formed on an upper surface thereof, and a flat primary heat insulating wall formed on an upper surface thereof are installed. The liquefied natural gas storage tank according to [15], wherein the storage tank is liquefied natural gas.

  [17] The corner structure has a secondary heat insulating wall of a corner portion formed in an L shape so as to be in contact with a corner point where two surfaces of the tank meet, and a secondary of the corner portion formed on the upper surface thereof. An L-shaped corner support plate is installed to receive the load of the storage tank on the sealing wall, the primary heat insulating wall of the corner portion formed on the upper surface, and the upper surface of the primary heat insulating wall of the corner portion. The liquefied natural gas storage tank according to [15], wherein the liquefied natural gas storage tank according to [15], wherein the liquefied natural gas storage tank is manufactured as a preliminary assembly and fixed by a protruding member at a corner portion formed on each inner surface of the tank.

  [18] The liquefied natural gas according to [16], wherein the corner support plate is installed so as to be slidable on the primary heat insulating wall of the corner portion so that the corner support plate can be contracted and extended by heat. Storage tank.

  [19] In the corner structure, the secondary heat insulation wall and the primary heat insulation wall are protruded through the secondary heat insulation wall and an upper end portion of the lower support load, and a lower end portion of the upper support load penetrates the primary heat insulation wall. The storage tank for liquefied natural gas according to one of [18], wherein the storage tank is mechanically fastened by a connection reinforcing base for connecting and fixing the two.

  [20] The storage of liquefied natural gas according to [19], wherein the upper support load penetrates the primary heat insulating wall and is fastened to the corner support plate to support the corner support plate. tank.

  [21] The storage tank for liquefied natural gas according to [20], wherein the upper support load is fastened to the corner support plate by welding.

  [22] The liquefied natural gas storage tank according to [21], wherein the primary sealing wall is fastened to an upper end portion of the anchor portion by welding.

  [23] In the module, the flange projecting at the lower end of the planar structure located in the planar portion of the tank is inserted into a gap formed between the lower portion of the anchor portion and the bottom surface of the tank, and upward The storage tank for liquefied natural gas according to any one of [10] to [22], wherein movement of the liquefied natural gas is limited but sliding is possible in the horizontal direction.

  As described above, the storage tank for liquefied natural gas according to the present invention simplifies the installation structure of the storage tank installed inside the ship that transports liquefied natural gas, which is a liquid at an ultra-low temperature, and shortens the assembly process. , Providing more reliable marine, vehicle, and onshore tanks, while maintaining the liquid-tightness of storage tanks and eliminating the stress of mechanical deformation caused by loading or loading of liquefied natural gas more easily Has the advantage of being able to.

  In particular, in order to facilitate the assembly between adjacent modules, the lower end portion protrudes, and the flange protruding at the lower end of the planar structure (module) located on the plane portion of the tank is formed between the lower portion of the anchor portion and the tank. It is inserted into a gap formed between the bottom surfaces and can be slid between the primary sealing wall and the tank bottom surface. This sliding has an effect that the heat insulation system inside the tank is not destroyed even when the ship is twisted by waves or the like and the ship is bent by the twist. It is easy to assemble.

  In the present invention, the lower end of the module used in the storage tank for liquefied natural gas protrudes in order to facilitate assembly between the modules. The flange projecting at the lower end of the planar structure (module) located on the planar portion of the tank is inserted into a gap formed between the lower portion of the anchor portion and the bottom surface of the tank, and the primary sealing wall and the bottom surface of the tank Sliding is possible. This structure has an effect that the heat insulation system inside the tank is not destroyed even when the ship is twisted by waves or the like and the ship is bent by the twist. It is easy to assemble.

According to one embodiment of the present invention,
A tank for loading liquefied natural gas;
A primary sealing wall in direct contact with the liquefied natural gas loaded in the tank described above;
A number of connecting means (ie anchor structures) that mechanically connect the tank described above and the primary sealing wall described above;
Consists of an intermediate wall structure located between the tank described above and the primary sealing wall described above,
A storage tank for liquefied natural gas is provided in which the intermediate wall structure is movable relative to at least one of the tank and the primary sealing wall.

  It is desirable that the intermediate wall structure described above can move in the horizontal direction with respect to at least one of the tank and the primary sealing wall described above. Here, the tank indicates a structure before the heat insulating wall and the sealing wall are installed. The intermediate wall structure described above has a large number of holes, and the connecting means passes through the holes.

According to another embodiment of the present invention, the intermediate wall structure described above is
A primary insulation wall directly in contact with the primary sealing wall as described above;
A secondary insulation wall in direct contact with the tank described above;
There is provided a storage tank for liquefied natural gas, characterized in that it is composed of a secondary sealing wall positioned between the primary heat insulating wall and the secondary heat insulating wall. The secondary sealing wall is characterized in that the intermediate wall structure and the connecting means are connected in a liquid-tight manner.

  In addition, the intermediate wall structure described above can be composed of a large number of modules (Modules), and the above-mentioned module is composed of a large number of planar structures positioned at the planar portion of the tank and a large number of corners positioned at the corner portion. Consists of a corner structure. The module described above is preferably manufactured as a pre-assembly. The corner structure is bonded to the tank with an adhesive (P) and can move only with respect to the primary sealing wall. The planar structure is called the primary sealing wall and tank. It is desirable to be able to move with respect to both. It is desirable to install the above-mentioned storage tank for liquefied natural gas on a ship. It is desirable that the upper end portion of the connecting means is connected to the primary sealing wall by welding.

  According to another embodiment of the present invention, the heat insulation module used in the storage tank for liquefied natural gas is characterized in that the lower end portion protrudes so that adjacent modules can be easily assembled. A module for manufacturing a liquefied natural gas storage tank is provided. The module described above includes a primary insulating wall; a secondary sealing wall bonded to the lower portion of the primary insulating wall with an adhesive (P); and an adhesive (P) bonded to the lower portion of the secondary sealing wall. It is desirable to be comprised with the secondary heat insulation wall. Further, the module described above has a quadrangular prism, and one or more corner portions are formed in a partially cut shape. It is desirable that the above-mentioned heat insulating wall is made of polyurethane foam (Polyurethane Foam).

Also, the module mentioned above is the primary insulation wall;
An upper plate attached to the upper part of the primary insulation wall as described above;
A secondary sealing wall attached to the lower part of the primary insulation wall as described above;
A secondary insulation wall attached to the lower part of the secondary sealing wall as described above;
It consists of the lower plate material attached to the lower part of the above-mentioned secondary heat insulation wall,
A module for manufacturing a storage tank for liquefied natural gas is provided in which the lower plate is extended from one or more side surfaces of the secondary heat insulating wall to form a flange. .

  It is desirable that the primary or secondary heat insulating wall and the sealing wall are bonded with an adhesive (P). The secondary sealing wall preferably projects from one or more side surfaces of the primary and secondary heat insulation walls. Moreover, the above-mentioned secondary sealing wall is connected to the modules in a liquid-tight manner.

  In the above-mentioned module, the flange protruding at the lower end of the planar structure located in the plane part of the tank is inserted into the gap formed between the lower part of the above-mentioned anchor part and the tank bottom surface, and upward Is limited, but sliding is possible in the horizontal direction. The gap formed between the lower portion of the anchor portion and the tank bottom surface means a gap formed between the anchor lower plate and the tank bottom surface described in the embodiment below.

According to another embodiment of the present invention, two continuous sealing walls and two heat insulating walls are included, and the primary sealing wall among the above-described sealing walls is a liquid natural gas stored in a storage tank. In a liquefied natural gas storage tank that is in direct contact with the primary insulation wall, the secondary sealing wall and the secondary insulation wall in the lower part,
The primary sealing wall is supported by an anchor portion mechanically fastened to the bottom surface of the tank,
The primary heat insulation wall, the secondary sealing wall, and the secondary heat insulation wall described above are composed of a plurality of planar structures (that is, modules) whose upper and lower surfaces are fastened in the planar portion of the tank. It is installed so as to allow some sliding (ie, horizontal movement) between the primary sealing wall and the bottom surface of the tank. However, the load on the cargo in the tank is equally received by the anchor part and the heat insulating wall, but the primary sealing wall is supported by welding only to the anchor part, so the heat insulating wall is slightly sliding with respect to the primary sealing wall. (Sliding) is possible.

  Each of the modules described above can be slid between at least one of the primary sealing wall and the tank bottom surface between the primary sealing wall and the tank bottom surface, but only the planar structure is the primary sealing wall and the tank bottom surface. Can slide on both.

  When the structure where the tank is installed is a double-shell ship, the above-mentioned “bottom surface (or inner surface) of the tank” naturally means the inner wall (inner shell) of the side and lower surface of the hull, the upper wall of the tank, and the horizontal bulkhead Means.

  Here, the term “sliding” refers to a tank insulation system consisting of primary and secondary insulation walls when the ship is twisted due to waves or the like and bent due to the twist in the case of a ship. However, each unit body of the heat insulating wall such as the following planar structure does not break the heat insulating system against the bending stress. It means you can move. The above-mentioned heat insulating wall unit means a primary heat insulating wall mainly formed as a pre-assembly in the present invention, a secondary sealing wall bonded thereto, and a unit of a secondary heat insulating wall bonded thereto.

  The primary heat insulating wall and the secondary heat insulating wall are bonded to the upper and lower surfaces of the secondary sealing wall with an adhesive (P) and formed into a pre-assembly. It is desirable to become. The prefabricated assembly according to the present invention includes a corner structure installed at the corner of the tank and a planar structure installed at the plane of the tank. The secondary heat insulating wall includes a heat insulating material made of polyurethane foam (Polyurethane Foam) and a plate material made of plywood (Plywood) bonded to the lower surface thereof. Furthermore, the above-mentioned primary heat insulating wall includes a heat insulating material made of polyurethane foam (Polyurethane Foam) and a plate material made of plywood (Plywood) bonded to the upper and lower surfaces thereof. The material of the secondary sealing wall may be an aluminum sheet or a flexible sheet (Triplex, preferably Rigid Triplex).

  On the other hand, the above-mentioned secondary sealing wall protrudes from the side surfaces of the above-mentioned primary heat insulating wall and secondary heat insulating wall, and the secondary of the adjacent pre-assembly is adjacent when assembling each unit body of the pre-assembly (planar structure). It is interconnected with the sealing wall or the secondary sealing wall of the anchor part. Here, the shape and material of the primary sealing wall described above are not particularly limited, and may be made of stainless steel as described in the patent published by the applicant and the patent published by TGZ described below. And wrinkle (Corrugation) can be formed. The side space formed between the secondary heat insulating walls is filled with a heat insulating material made of polyurethane foam (Polyurethane Foam). On the other hand, the side space formed between the primary heat insulating walls is filled with a heat insulating material made of glass wool.

  In addition, the secondary sealing wall extends to the space formed by the heat insulating wall (that is, between the side surfaces of the heat insulating wall), and the end of the secondary sealing wall is the upper fixing plate in the space. The fastening surfaces of the upper fixing plate and the lower fixing plate may include a groove formed so that the end of the secondary sealing wall can be inserted. Here, the above-mentioned groove can be formed to be bent, and the fastening body of the above-mentioned lower fixing plate and upper fixing plate has some bending in the longitudinal direction, and is slightly longer, so that the sealing wall by cooling is formed. The stress can be absorbed during contraction.

  According to another embodiment, the secondary sealing wall is coated with a resin material on the upper surface and the lower surface, and is extended to a side space formed by an adjacent heat insulating wall. Including the upper connecting member and the lower connecting member that are fastened so as to be in contact with the end of the secondary sealing wall, the upper and lower heat-resistant members and the lower connecting member are formed with uneven portions formed on the fastening surfaces. Thus, it is desirable that the resin material applied to the upper and lower surfaces of the secondary sealing wall is fastened while being squeezed. Such a fastening method further improves the sealing characteristics of the secondary sealing wall.

  According to another embodiment of the present invention relating to the connection of the secondary sealing wall, the corner structure fastened to the corner part inside the tank described above, and sliding on the plane inside the tank described above. It may include a planar structure that is positioned for movement and an anchor structure that is fastened to the tank and attaches the planar structure to the interior of the tank.

  Here, the above-described planar structure is a plane that is fixed at the same height as the secondary heat insulating wall of the above-mentioned corner portion, one of which is fixed by the protruding member of the corner portion to which the above-described corner structure is fixed. It is desirable to manufacture a pre-assembly comprising a secondary heat insulating wall of a part, a secondary sealing wall of a flat part formed on the upper surface thereof, and a primary heat insulating wall of a flat part formed on the upper surface thereof.

  In addition, the above-mentioned anchor structure has an anchor support load fixed to an anchor lower plate that is mechanically fixed to a corner portion where the above-described planar structure is fitted, and a center portion is inserted and fixed to the above-described anchor support load. The secondary heat insulating wall of the anchor portion installed at the same height as the secondary heat insulating wall of the flat surface portion, and the upper surface of the secondary heat insulating wall of the anchor portion with the center portion inserted into the anchor support load described above The secondary sealing wall of the anchor part that is mechanically attached to the secondary sealing wall of the adjacent flat part while being fixed to the upper part, and the upper part of the secondary sealing wall of the anchor part by inserting the center part into the anchor support load described above A primary insulating wall of the anchor portion fixed to the surface and an upper cap fixed to the upper end portion of the anchor supporting load, which is the upper central portion of the primary insulating wall of the anchor portion, may be included.

  In the above-described structure, the above-described anchor lower plate is configured to fix the lower plate material of the secondary heat insulating wall of the unit structure of the pre-assembly that contacts the anchor lower plate to the inner surface of the above-described tank. Further, the secondary sealing wall of the anchor portion described above can include a wrinkle portion formed on the outer peripheral surface portion. Here, the secondary sealing wall of the anchor part is connected to the secondary sealing wall of the pre-assembly that faces and protrudes from the section of the primary heat insulating wall of the anchor part. The primary heat insulating wall of the anchor part and the secondary heat insulating wall of the anchor part are respectively bonded to the upper and lower surfaces of the secondary sealing wall of the anchor part with an adhesive (P).

  Meanwhile, the secondary heat insulating wall of the anchor part may include a polyurethane foam (Polyurethane Foam) heat insulating material and a plywood bonded to an upper surface thereof. The primary heat insulating wall of the anchor part may include a polyurethane foam (Polyurethane Foam) heat insulating material and a plywood (Plywood) material bonded to the upper and lower surfaces thereof. The plywood plate material bonded to the lower end of the secondary heat insulating wall of the pre-assembly is fixed to the lower surface of the tank by an anchor lower plate that protrudes from the side surface and constitutes the anchor portion. Such fixing prevents the vertical movement of each heat insulating wall. Although the lateral direction is fixed, slight movement is possible.

  On the other hand, the above-mentioned corner structure is formed on the secondary heat insulating wall of the corner portion formed in an L shape so as to be in contact with the corner point where the two surfaces formed inside the above-mentioned tank meet, and the upper surface thereof In order to support the load of the storage tank on the secondary sealing wall of the corner portion and the primary heat insulating wall of the corner portion formed on the upper surface thereof, and the upper surface of the primary heat insulating wall of the corner portion described above, It can be manufactured in a pre-assembly having a large number of corner support plates, and can be fixed by the protruding members at the corners respectively formed on the inner surface of the tank.

  The corner support plate described above can be installed to allow some sliding movement in order to be able to contract and extend by heat. In addition, the primary heat insulating wall and the secondary heat insulating wall of the corner portion can be bonded to the upper and lower surfaces of the secondary sealing wall with an adhesive (P), respectively. At the same time, the primary heat insulation wall, the secondary heat insulation wall and the corner support plate described above can be manufactured in a pre-assembly.

  On the other hand, the above-mentioned corner portion preliminary assembly (corner structure) can be fixed by the protruding members of the corner portions formed on the inner surface of the tank. In addition, the secondary sealing wall may be formed to protrude from the side surfaces of the primary heat insulating wall and the secondary heat insulating wall. Further, a plate material is formed on the lower surface of the primary heat insulation wall and the secondary heat insulation wall described above, and the above plate material is fixed by the above protruding member formed so that the end portion protrudes from the above heat insulating material. It is fixed to the tank lower surface by a stand. The lower surface of the secondary heat insulating wall is preferably bonded to the tank wall surface with an adhesive (P).

  In addition, the secondary heat insulating wall and the primary heat insulating wall at the corner portion described above are the upper end portion of the lower support load protruding through the secondary heat insulating wall and the lower end of the upper support load penetrating the primary heat insulating wall. It can be mechanically fastened by a connection reinforcing stand for connecting and fixing the parts.

  In addition, the lower support load described above is inserted and fixed in a load support cap fixed to the lower surface of the secondary heat insulation wall, and after passing through the secondary heat insulation wall, the upper end portion thereof is connected and strengthened as described above. Can be fixed to the pedestal. In addition, the upper support load is inserted and fixed to the load support cap fixed to the connection reinforcing base while being fixed to the lower portion of the primary heat insulation wall, and passes through the primary heat insulation wall to pass the corner. The support plate can be supported. It is desirable that the supporting method is fastened by welding. The primary sealing wall is positioned on the corner support plate, and the primary sealing wall and the corner support plate are fastened by welding. With this structure, the primary sealing wall of the corner is stably supported by the lower support load fastened to the bottom of the tank, the upper support load fastened to the lower support load, and the corner support plate fastened to the upper support load. Is done. Moreover, since the above-mentioned corner support plate is comprised of a somewhat thicker plate, the primary sealing wall of the corner portion where asymmetric stress occurs can be stably supported. In addition, the above corner support plate is weak in direct fastening with the primary heat insulating wall of the corner portion, and can be somewhat slid (Sliding) with respect to the primary heat insulating wall. In addition, it is possible to overcome the mechanical stress due to the difference in expansion / contraction rate due to temperature change with the primary sealing wall.

  According to still another embodiment of the present invention, the above-described anchor structure includes an anchor support load fixed to an anchor lower plate mechanically fixed to a corner portion where the above-described planar structure meets, and the above-described anchor. A secondary heat insulating wall of the anchor portion, which is installed and fixed at the same height as the secondary heat insulating wall of the above-described flat portion, with the center portion inserted and fixed to the support load, and the anchor having the central portion inserted into the above-mentioned anchor support load. A secondary sealing wall of the anchor portion fixed to the upper surface of the secondary heat insulating wall of the portion and mechanically attached to the secondary sealing wall of the adjacent flat portion, and the anchor portion having the center portion inserted into the anchor support load described above A primary insulating wall of the anchor portion fixed to the upper surface of the secondary sealing wall of the main body, and an upper cap fixed to the upper end portion of the anchor supporting load that is the upper central portion of the primary insulating wall of the anchor portion. And wherein the door.

  The anchor lower plate described above serves to fix the lower plate material of the secondary heat insulating wall of the unit structure in contact with the inner surface of the tank. The secondary sealing wall of the anchor portion described above preferably includes a wrinkle portion on the outer peripheral surface portion. The primary heat insulating wall of the anchor part and the secondary heat insulating wall of the anchor part are preferably bonded to the upper and lower surfaces of the secondary sealing wall of the anchor part with an adhesive (P).

  As still another embodiment of the anchor portion, the above-described anchor structure has a built-in load support cap that is installed at fixed intervals on the bottom surface and the left and right partition walls of the space formed inside the above-described tank. Anchor lower plate for fixing the anchor base plate, an anchor support load fixed so as to be perpendicular to the load support cap, and a secondary insulation of the anchor portion whose center is inserted and fixed to the anchor support load. A wall, a secondary sealing wall of the anchor part fixed to the upper surface of the secondary heat insulating wall of the anchor part, the center part being inserted and fixed to the anchor supporting load, and a secondary sealing wall of the anchor part A primary heat insulating wall of the anchor portion that is fixed to the upper surface of the anchor portion and the center portion is inserted and fixed to the anchor support load described above, and fixed to the upper end portion of the anchor support load described above. The upper cap for fixing the primary heat insulating wall of the anchor portion of the anchor portion, and the side portion of the primary heat insulating wall and the upper surface of the secondary sealing wall that are arranged adjacent to each other, are spaced a predetermined distance from the primary heat insulating wall of the anchor portion described above. And the above-mentioned secondary sealing wall and the planar connecting heat insulating wall fixed to the upper part of the end of the secondary sealing wall of the anchor part. The above-mentioned flat portion of the heat insulating wall is fixed to the side surface of each adjacent primary heat insulating wall and the upper surface of the secondary sealing wall fixed to the upper portion of the adjacent secondary heat insulating wall. It is desirable that the heat insulating wall be fixed with an adhesive (P) to the secondary sealing wall of the above-described flat portion and the secondary sealing wall of the anchor portion. A space between the above-described planar heat insulating wall of the flat portion and the primary heat insulating wall of the anchor portion is filled with a heat insulating material. The above-mentioned connecting heat insulating wall of the flat part also has a role of fixing the secondary heat insulating wall whose end is located at the lower part thereof.

  The method for manufacturing a storage tank for liquefied natural gas according to the present invention includes two continuous sealing walls and two heat insulating walls, and the primary sealing wall among the above-described sealing walls is stored in the storage tank. In a method of manufacturing a storage tank facing natural gas and arranged in a procedure of a primary heat insulating wall, a secondary sealing wall, and a secondary heat insulating wall at a lower portion thereof, a corner portion formed inside the tank described above Each of the protruding members is formed, and the anchor base plate is attached and fixed to the inner surface of the tank at regular intervals, and the secondary heat insulating wall and the secondary sealing wall with the protruding member of the formed corner as a boundary. A step of adhering and fixing a corner structure pre-assembled with a primary heat insulating wall and a corner support plate, and fixing the fixed corner structure to the protruding member of the corner as a fixing base, and No Fixing the anchor lower plate to the upper part of the car base plate and fixing the anchor support load vertically to the central part, and the secondary heat insulating wall, the secondary sealing wall on one side of the fixing base to which the corner structure is fixed, One side part of the planar structure assembled in advance in the order of the primary heat insulating wall is inserted and fixed, and the corner part on the other side of the planar structure is formed into a space formed by the anchor base plate and the anchor lower plate. The step of inserting and fixing, and filling the space formed by the secondary heat insulating wall of the corner structure and the planar structure with a heat insulating material, and the secondary heat insulating wall and the anchor portion of the anchor portion on the anchor supporting load described above. Inserting the secondary sealing wall, fixing the secondary sealing wall of the corner structure and the secondary sealing wall of the planar structure adjacent thereto, and fixing the secondary sealing wall of the planar structure to each other In addition, the plane structure described above Fixing the secondary sealing wall of the above-mentioned anchor part in contact with the secondary sealing wall of the body, and inserting the primary thermal insulation wall of the anchor part into the above-mentioned anchor support load, and then attaching the anchor upper plate and the anchor thermal insulation plate material And fixing the anchor upper cap to the end of the anchor support load to complete the assembly of the anchor structure, and the primary structure formed by the corner structure, the planar structure, and the anchor structure. Filling the space between the insulating wall with a heat insulating material and attaching and fixing a primary sealing wall having wrinkles on the upper surface of the corner structure, the planar structure and the anchor structure.

  The step of fixing the anchor lower plate to the upper portion of the anchor base plate and vertically fixing the anchor support load to the center portion is performed at the center portion of the anchor lower plate which is bolted to the anchor base plate. The anchor support load described above can be fixed by bolting to the fixed load support cap.

  The step of filling the space formed by the secondary heat insulating walls of the corner structure and the planar structure with the heat insulating material can be filled with polyurethane foam as the heat insulating material.

  Further, the secondary sealing wall of the corner structure and the secondary sealing wall of the planar structure in contact with the corner structure are fixed, and the secondary sealing wall of the planar structure is fixed to each other. The step of mutually fixing the secondary sealing wall of the anchor part in contact with the secondary sealing wall includes a lower fixing plate positioned at the lower part of the secondary sealing wall and an upper fixing plate positioned so as to face the upper surface. And can be fixed by bolting. Here, the secondary sealing wall of the above-mentioned corner structure and the secondary sealing wall of the planar structure in contact therewith are fixed, and the secondary sealing wall of the above-mentioned planar structure is mutually fixed, and the above-described planar structure The step of mutually fixing the secondary sealing wall of the anchor part in contact with the secondary sealing wall is a lower fixing plate for bolting the secondary sealing wall and an upper fixing positioned so as to face the upper surface. It can be fixed to a curved surface shape by a curved surface portion formed on the plate.

  The LNG tanks of the present invention described above include automobiles with cargo flow, liquefied natural gas storage tanks installed on ships, land-type tanks with little flow, etc. It can be installed in the above-mentioned ship, land tank, vehicle and the like.

  In addition, the present invention simplifies the structure of the anchor portion that connects the planar structure of the storage tank installed inside the ship that transports liquefied natural gas, which is a liquid at an ultra-low temperature state, and shortens the assembly process, and the adjacent plane. The liquid tightness of the anchor portion is firmly maintained by binding the connection of the structures. At the same time, when the ship hull is twisted due to waves during the voyage of the ship, in the heat insulation system according to the present invention, the primary sealing wall is directly connected to the anchor part, but the direct connection with each heat insulation wall is weak. Each insulation wall can be slightly slid with respect to the primary sealing wall, and the above-mentioned hull can adapt to torsion, so that the insulation system does not break.

  In addition, the present invention simplifies the corner structure of the tank installed inside the tank for storing liquefied natural gas, which is a liquid in an ultra-low temperature state, shortens the assembly process, and highly maintains the liquid tightness of the corner portion, There is an advantage that a highly reliable ship can be provided by installing a thick plate material that can support the corner portion, thereby easily eliminating the stress caused by mechanical / thermal contraction and expansion of the storage tank.

  In addition, the present invention provides the fastening of the secondary sealing wall in the vicinity of the anchor portion by fastening with the adhesive (P) between the connecting heat insulating wall of the plane portion and the secondary sealing wall below it and the fastening structure of the upper and lower connecting members. The fastening structure is further improved, and the liquid-tightness and safety are further increased.

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

  The present invention stores liquefied natural gas in a high-pressure, ultra-low temperature state as a storage tank for liquefied natural gas. Therefore, the storage tank for liquefied natural gas has a structure in which impact resistance and liquid tightness are firmly maintained.

  The storage tank for liquefied natural gas installed in automobiles and ships with cargo flow must be devised for countermeasures against mechanical stress due to cargo flow compared to land-type tanks with little flow. There is a difference. However, since the storage tank of liquefied natural gas installed in a ship provided with countermeasures against mechanical stress can naturally be used in a land-type tank, the specification of the present invention is installed in the ship. The structure of a storage tank for liquefied natural gas will be described as an example.

  FIG. 39 is a cross-sectional view of an exemplary vessel 3900 with an LNG tank installed in accordance with one embodiment of the present invention. The ship 3900 is composed of a double-shell hull of a hull outer wall (outer shell) 3901 and a hull inner wall (inner shell) 3903 that form the outer shape of the ship. The hull inner wall and the hull outer wall are connected by 3905 and are integrally formed. Depending on the case, the hull inner wall 3903 may not exist.

  Also, the upper part of the ship 3900 may be formed on a single layer deck different from that shown in FIG. The interior of the hull inner wall 3903 may be divided by one or more partition walls 3907. Septum 3907 can also form a cofferdam as is known in conventional LNG.

  Each internal space 3911 can constitute a tank for loading a cryogenic liquid such as liquefied natural gas. As an example, a conceptual diagram in which a tank is installed in the second space from the left side of the ship 3900 will be described. The primary sealing wall 250 is in contact with the LNG 3913 as a sealing wall for primarily liquid-tightening LNG, and a wrinkle portion (Corrugation) is formed to cope with a temperature change caused by loading of LNG in an ultra-low temperature state as conventionally known. May be. The primary sealing wall 250 is connected to the ship inner wall 3903 or the bulkhead 3907 by a number of anchor structures or connecting means 3915. An intermediate wall structure 3917 is positioned between the primary sealing wall 250 and the hull inner wall 3903 constituting the tank. The intermediate wall structure 3917 (200a, 200b) is located between the hull inner bulkhead or the hull inner wall and the primary sealing wall 250. These are configured as modules, and are located at the corners. The structure 3917 (100) and the planar structure 3917 (200) located in the plane portion are configured.

  FIG. 39 enlarges the module from that in an actual LNG tank to aid understanding. The intermediate wall structures 3917 are actually quite many in number and are interconnected.

  FIG. 40 is an enlarged view of the circle 3923 shown in FIG. In the illustrated example, the intermediate wall structure 3917 (planar structures 200a, 200b and corner structure 100) includes primary heat insulating walls 204, 51, secondary heat insulating walls 202, 53, and secondary sealing walls 203, 52. . Each intermediate wall structure can have one or more additional functional layers. According to an embodiment of the present invention, the contact surfaces of the sealing walls and the heat insulating walls of the unit modules (200, 100) of the intermediate wall structure 3917 described above are bonded together with an adhesive (P) to be integrated. Form. In addition, a flange is formed at the lower end of the secondary heat insulating walls 202 and 52 below the intermediate wall structure 3917. Usually, the secondary heat insulating wall is made up of PUF (polyurethane foam) which is an insulating material and a plate attached to the lower part thereof, and this plate increases from the PUF (polyurethane foam) to form a flange. The primary insulation wall consists of a PUF and a plate attached with adhesive (P) on top of it.

  In the illustrated example, each anchor structure 3915 has anchor support loads 112a and 112b, lower fixing members 113a and 113b, and primary heat insulating walls (not shown) that are placed in the upper spaces 3929 and 3931. One end of the anchor support load 112a, 112b is connected to the primary sealing wall 250, and the other end is connected to the hull inner wall (3903). The connection relationship of the anchor structure will be described in detail in another embodiment below. The anchor structure 3915 connects the hull inner wall or bulkhead constituting the tank and the primary sealing wall 250.

  The anchor structure 3915 is located at a connection point between the modules 100, 200a, and 200b of the adjacent intermediate wall structures. The anchor structure 3915 is connected to connect the intermediate wall structures to the inner wall or bulkhead of the hull that forms a tank. To fix. In another embodiment, the corner structure and the planar structure in the intermediate wall structure can be fixed to the inner wall or bulkhead by means other than the anchor structure. This will be described in detail later. As yet another example, the anchor structure 3915 may be located in a hole formed in the wall of a single intermediate wall structure.

  The fixing members 113 a and 113 b of the anchor structure 3915 are installed around the anchor support load 112. The spaces 3929 and 3931 are filled with an insulating material such as PUF (polyurethane foam). A recess is formed in the lower part of the fixing members 113a and 113b, and a flange 3925 protruding from the lower part of the secondary heat insulating walls 202 and 53 is brought into close contact with the tank. With this structure, the planar structure 200 in the intermediate wall structure 3917 can move slightly with respect to the primary sealing wall at the lower part of the primary sealing wall 250, but the movement in the vertical direction is limited. . There may be some space between the lower recess 3927 of the fixing member 113a and the flange 3925 of the secondary heat insulating wall 202, and there is also some space between the fixing member 113a and the secondary heat insulating wall 202. In FIG. 40, the planar structure 200a can move horizontally from side to side. Of course, in FIG. 40, the planar structure 200a can also be moved horizontally in the front-rear direction (the above-described left-right direction). On the other hand, in the intermediate wall structure 3917, the surface of the corner structure 100 that is in contact with the tank is bonded and fixed with an adhesive (P). The primary sealing wall 250 can move somewhat with respect to the corner structure 100 described above. Of course, the primary sealing wall 250 is connected to the hull by the anchor structure. However, the primary sealing wall can be connected to the lower part of the anchor structure and the hull even if welded to the upper part of the anchor structure. If connected by a method other than welding, it is considered that the primary sealing wall can move somewhat with respect to the corner structure (or hull). Specific examples of this will be described in other examples below.

  In FIG. 40, the secondary sealing walls 52, 203 and 3933 are connected in a liquid-tight manner as shown in FIG. Also, the secondary sealing wall is connected in a liquid-tight manner between the multiple modules 100 and 200.

  A secondary sealing wall 3933 of the anchor structure is fixed to the anchor support load 112a of the anchor structure 3915 by a suitable fastening member, in the embodiment of FIG. 41, by two nuts 3936, 3937. The secondary sealing walls 52 and 203 of the adjacent intermediate wall structure are liquid-tightly connected by a suitable connecting member 212 and a screw 214. The surface where the connecting member 212 and the secondary sealing wall are in contact can be coated with an adhesive (P) to increase the liquid tightness. In order to increase liquid tightness, a bent portion 3935 can be formed on the upper and lower joint surfaces of the connecting member 212. A wrinkle 115 is formed around the secondary sealing wall 3933 of the anchor structure 3915 to absorb the expansion or contraction stress of the secondary sealing wall generated when the adjacent planar structure moves horizontally.

  In addition, the connection between the secondary sealing walls by the connecting member 212 is also applied to the connection between the sealing walls of the adjacent planar structures and the connection between the sealing walls of the planar structure and the corner structure.

  According to still another embodiment of the present invention, the liquefied natural gas storage tank has a secondary heat insulating wall installed adjacent to a surface formed inside the hull of the ship, and a second insulating wall formed on the upper surface thereof. And a primary heat insulating wall formed on the upper surface of the secondary sealing wall. In the present invention, such a tank is preliminarily manufactured as a pre-assembly outside the ship, and a corner structure and a planar structure are manufactured in advance, respectively. It is desirable to incorporate it into the interior space.

  In other words, after pre-fabricated corner structures are first fixed inside the hull, plane structures are assembled on the basis of these, and the anchor structures are assembled at the tank assembly site. It consists of.

  FIG. 6 is a cross-sectional view illustrating an internal structure of a corner structure constituting a storage tank for liquefied natural gas according to an embodiment of the present invention, and FIG. 7 illustrates liquefaction installed in a ship according to an embodiment of the present invention. It is the whole perspective view which illustrated the connection relation of the corner structure of the storage tank of natural gas. FIG. 8 is a partial enlarged cross-sectional perspective view illustrating a corner structure of a storage tank for liquefied natural gas installed in a ship according to an embodiment of the present invention.

  As shown in FIGS. 6 to 8, the corner structure (100) according to an embodiment of the present invention has the secondary heat insulating wall (53) at the corner so as to contact each corner point where the ship's hull surface matches. It is formed in L shape, and the secondary sealing wall (52) of the corner part is adhered and fixed to the same form on the upper (inside) surface, and the primary heat insulating wall (51) of the corner part is formed on the upper surface. As a structure to be assembled, it is pre-assembled. Here, the primary heat insulating wall (51) of the corner portion and the secondary heat insulating wall (53) of the corner portion are respectively bonded to the upper and lower surfaces of the secondary sealing wall (52) of the corner portion with an adhesive (P). It is desirable to adhere and fix firmly.

  The connection relationship between the corner support plate (50), the primary and secondary heat insulating walls (51, 53), the secondary sealing wall (52), and the upper and lower (outer) support loads (70, 60) described above. This will be described in more detail as follows.

  The interior of the vessel for storing liquefied natural gas (LNG) is horizontally integrated with the bottom bottom (1, the inner shell of the double-shell hull) and the bottom so as to form a space where the corner structure of the present invention can be installed. A partition wall (2) is formed, and the present invention relates to a corner structure installed at a point where the lower bottom surface (1) and the left or right or horizontal partition wall (2) meet at a predetermined angle. Therefore, the shape of the secondary heat insulating wall has a tank surface connection angle that differs depending on the tank pattern and the corner position, and therefore the pattern may be wider than the L-shape.

  As described above, an L-shaped secondary heat insulating wall (53) that is in contact with the lower bottom surface (1) and the partition wall (2) at a point where the lower bottom surface (1) and the partition wall (2) meet at a predetermined angle. ) Is formed. The use of the terms 'primary' and 'secondary' in the present invention has the function of primarily sealing or insulating the liquefied natural gas based on the liquefied natural gas stored in the storage tank, or the secondary This is used as a standard for classification of whether it has a function of sealing or insulating.

  The secondary heat insulation wall (53) is composed of a secondary heat insulation material (58) made of polyurethane foam and a plate material (56) of the secondary heat insulation wall made of plywood bonded to the lower surface thereof. Therefore, the plate material (56) of the secondary heat insulating wall comes into contact with the lower bottom surface (1) and the partition wall (2) formed inside the hull. US 4,747,513, WO 909909, US 5,501,359, US 5,586,513, JP2000-038190 (open), US6,035,795, JP2001-122386 (open) ), Etc., and the contents described in the above-mentioned patents are part of the specification of the present invention, and these techniques can also be used in the present invention.

  When the secondary heat insulating wall (53) is formed, the secondary sealing wall (52) is positioned on the upper surface thereof. The secondary sealing wall (52) has a function of secondarily blocking the leakage gas of the liquefied natural gas stored in the storage tank. The upper surface of the secondary heat insulating material (58) of the secondary heat insulating wall (53) is adhered to the lower surface of the above-described secondary sealing wall (52) with an adhesive (P). The material of the secondary sealing wall 52 is preferably an aluminum sheet or a flexible sheet (so-called 'Triplex').

  Although the above-mentioned reference patent US 6,035,795 describes Flexible Triplex, it is desirable to use a rigid Rigid Triplex in the present invention.

  As described above, when the secondary heat insulating wall (53) and the secondary sealing wall (52) are fastened, the lower support load (for fixing to the primary heat insulating wall (51) formed on the upper surface thereof ( 60) penetrates the secondary heat insulation wall (53) and the secondary sealing wall (52) described above.

  That is, in the secondary heat insulating wall (53), through holes (holes) through which the lower support load (60) can pass are formed at regular intervals, and the through holes formed in the secondary heat insulating wall plate material (56). A load support cap (CAP) (61) capable of firmly fixing the lower portion of the lower support load (60) is inserted in the lower portion of the hole and supported by the secondary heat insulating wall plate material (56).

  After the lower support load (60) is inserted into the load support cap (61) and passes through the secondary heat insulating wall (53), the lower portion of the lower support load (60) is formed on the load support cap (61). It is firmly fixed inside with a fixing nut (62).

  Further, the upper part of the lower support load (60) penetrating the secondary heat insulating wall (53) penetrates the secondary sealing wall (52) fixed to the upper surface of the secondary heat insulating wall (53). Thus, the secondary sealing wall (52) is fixed on the lower support load (60) by a support nut (63) and a sealing wall fixing nut (64) attached to the upper part of the lower support load (60). The

  As described above, the upper end of the lower support load (60) fixed through the secondary heat insulation wall (53) and the secondary sealing wall (52) is fixed through the lower part of the primary heat insulation wall (51). Is done.

  That is, the primary heat insulating wall (51) is attached and fixed in contact with the secondary sealing wall (52) fixed to the upper surface of the secondary heat insulating wall (53). A lower plate member (55) of the primary heat insulating wall (51) that is in contact with and fixed to the secondary sealing wall (52) by an adhesive (P), a primary heat insulating material (57) formed on the upper surface thereof, and an upper surface thereof It is comprised by the upper board | plate material (54) of the primary heat insulation wall (51) attached and fixed to. The upper and lower plate members (54, 55) of the primary heat insulating wall described above are made of plywood, and the primary heat insulating material (57) is made of polyurethane foam.

  At this time, on the lower plate member (55) of the primary heat insulating wall (51) through which the lower support load (60) passes, the connection reinforcing base (90) is fixed for fixing to the upper support load (70) described later. Will be ranked. That is, the upper end of the lower support load (60) fixed through the secondary heat insulation wall (53) and the secondary sealing wall (52) is the lower plate (55) of the primary heat insulation wall (51). It is fixed to the bolt-nut fastening system through the connection reinforcement stand (90) located on the top.

  The lower part of a number of upper support loads (70) (first in the drawing of the present invention) is fixed to the connection reinforcing table (90), and the fixing system is welded to the lower surface of the connection reinforcing table (90). In this method, the upper support load (70) is inserted into the load support cap (71) fixed in such a manner, and then fixed with the fixing nut (72).

  Accordingly, the upper end portion of the lower support load (60) penetrating the secondary heat insulating wall (53) and the secondary sealing wall (52) and the lower end portion of the upper support load (70) penetrating the primary heat insulating wall (51) are solid. Fixed to.

  In FIG. 6 (a), the upper support load (70) is supported by the primary heat insulating wall (51) and its upper plate (54) fixed, and the upper plate of the primary heat insulating wall (51). The L-shaped corner support plate (50) is positioned and supported on the upper surface of (54) so that the asymmetric load of the storage tank described above can be received. Here, the above-mentioned corner support plate (50) is mechanically slidable without being fastened by the adhesive (P) of the above-mentioned primary heat insulating wall (51) so that it can be contracted and extended by heat. To conclude. A primary sealing wall (250), which will be described later, is fastened and positioned on the corner support plate (50) by a method such as welding.

  FIG. 6B shows another embodiment relating to the fastening method of the upper support load 70 and the corner support plate 50. That is, the upper support load (70) passes through the primary heat insulating wall (51) and the upper plate member (54) thereabove and is directly fastened to the corner support plate (50) to support the corner support plate (50). At this time, there is a little space between the upper support load (70) and the primary heat insulating wall (51) of the corner portion, and between the corner support plate (50) and the primary heat insulating wall (51). Since there is no direct fastening by an adhesive (P) or the like, the corner support plate (50) can be slightly slid with respect to the primary heat insulating wall (51). Such sliding eliminates a difference in expansion / contraction rate due to a temperature change due to a difference in material between the primary heat insulating wall (51) and the corner support plate (50).

  In addition, due to such a structure, the primary sealing wall of the corner portion has a lower support load (60) fastened to the bottom of the tank, an upper support load (70) fastened to the lower support load (60), It is stably supported by the corner support plate (50) fastened to the upper support load (70) of the main body. Moreover, since the above-mentioned corner support plate (50) is comprised of a slightly thicker plate, the primary sealing wall of the corner portion where asymmetric stress occurs can be stably supported.

  The material of the secondary sealing wall (52) forming the corner structure (100) of the present invention is an aluminum sheet or a flexible sheet (Triplex), and the secondary sealing wall of the corner portion described above. (52) is formed so as to protrude more from the side surfaces of the primary heat insulating wall (51) and the secondary heat insulating wall (53) of the corner portion described above, and is a pre-assembly of the adjacent flat portion in a later step. It is attached to the secondary sealing wall (203).

  Referring to FIG. 9 of the perspective view illustrating the planar structure constituting the storage tank for liquefied natural gas according to the present invention, the planar structure (200) constituting the present invention is pre-assembled outside the hull. The planar structure (200) has a structure similar to that of the corner structure (100) described above, and is an upper part of the primary heat insulating wall (204) of the planar portion. Is provided with an upper plate material (205) made of plywood.

  That is, a lower plate member (201) is prepared on the secondary heat insulating wall (202) of the flat surface in contact with the inner surface (1) of the hull, and the secondary heat insulating wall (202 of the flat surface portion made of polyurethane foam material on the upper surface thereof. ) And a secondary sealing wall (203) of a flat portion made of an aluminum sheet or a flexible sheet (Triplex, preferably Rigid Triplex) is attached to the upper surface, and polyurethane is attached to the upper surface. A primary heat insulating wall (204) of a flat portion made of foam material and an upper plate material (205) made of plywood are attached.

  Further, the lower plate material (201) and the secondary sealing wall (203) of the secondary heat insulating wall of the above-described flat portion slightly protrude from the side surfaces of the primary and secondary heat insulating walls (202, 204), and are adjacent in the subsequent process. The planar structure (200) or the corner structure (100) to be fixed is fastened to each other, and the corner portion on the opposite surface adjacent to the corner structure (100) is the anchor structure (150) of the present invention. ) And is formed into a shape that is partially cut so as to be fixed. The planar structure (200) of the present invention having such a structure is manufactured to have the same height as that of the adjacent corner structure (100).

  10 is a perspective view in which a projecting member and a stud pin (109) are installed on the wall of the hull, FIG. 11 is a perspective view in which a corner structure is inserted into the projecting member in FIG. 10, and FIG. 13 is a perspective view in which a corner structure is fixed, FIG. 13 is a perspective view in which a planar structure in contact with the corner structure in FIG. 12 is arranged, and FIG. 14 is an anchor support load after the planar structure in FIG. 13 is fixed. FIG. 15 is a perspective view in which a secondary heat insulating wall of the anchor portion and a secondary sealing wall of the anchor portion are installed on the anchor support load of FIG. 14, and FIG. 16 shows a plurality of planar structures on the wall of the ship body. FIG. 17 is a perspective view in which the secondary sealing wall of the anchor portion illustrated in the planar structure of FIG. 16 is fixed. FIG. 18 is an anchor on the upper portion of the secondary sealing wall of the anchor portion in FIG. Is a perspective view in which a primary heat insulating wall is inserted, 19 is a perspective view in which an anchor upper plate (117) is placed in a groove on the primary heat insulating wall (116) of the anchor portion of FIG. 18, and FIG. 20 shows an anchor heat insulating plate on the upper surface of the primary heat insulating wall of the anchor portion of FIG. FIG. 21 is a perspective view in which the anchor heat insulating plate material of FIG. 20 is fixed with an anchor upper cap, FIG. 22 is a perspective view in which a primary heat insulating material is inserted, and FIG. 23 is a primary seal in FIG. It is the perspective view in which the wall was installed.

  Hereinafter, a storage tank for liquefied natural gas according to an embodiment of the present invention and a process of installing such a tank will be described in detail with reference to FIGS.

  The storage tank for liquefied natural gas according to the present invention includes a lower bottom surface (1, inner hull of a double hull) and left and right side walls or horizontal bulkheads (2 ).

  First, the protruding members (80, 81) at the corners to which the corner structure (100) can be fixed are fixed to the lower bottom part (1) and the horizontal partition wall (2). At this time, as a method of fixing the protruding members (80, 81) at the corner portion, a method by welding is appropriate, and the interval from the corner portion is such that the corner structure (100) after assembly can be inserted. To do. Thus, a predetermined gap is formed between the corner structure (100) inserted between the protruding members (80, 81) in the corner portion and the above-described protruding members (80, 81).

  When the corner structure (100) is mounted between the protruding members (80, 81) as shown in FIGS. 10 to 12, the fixed base (101) is mounted on the protruding members (80, 81). ) Will be fixed.

  As a method of fixing at this time, a method of bolting and fixing the above-mentioned fixing base (101) to the above-mentioned protruding members (80, 81) is adopted. The above-mentioned fixing base (101) is formed with protrusions that correspond to the gaps between the above-mentioned protruding members (80, 81) and the corner structure (100), and the above-mentioned corner structure is fixed when the above-mentioned fixing base (101) is fixed. It is desirable to fill the gap between the body (100) and the projecting members (80, 81) to prevent flow. The lower bottom portion (1) or partition wall (2) inside the hull described above and the lower surface of the corner structure (100) are fastened by bonding, and secondarily the protruding members (80, 81) described above inside. The corner structure (100) of the present invention is attached to and fixed to.

  In addition, as shown in FIG. 13, the anchor base plate (150) of the anchor structure (150) for mutually fixing the planar structure (200) continuously installed from the corner structure (100) described above. 110) is fixed to the lower bottom (1) and the partition (2) surface at regular intervals.

  For this purpose, a group of stud pins (109) are installed at regular intervals on the inner surface of the hull. At this time, the above-described stud pin (109) is sharpened at the portion that comes into contact with the lower bottom surface (1) or the partition wall (2), and then welded in a pressurized state, so that the above-described stud pin (109) ) Is welded to the hull wall.

  Next, a through hole corresponding to the stud pin (109) is formed in the stud pin (109), and the anchor base plate (110) to be inserted into the stud pin (109) is inserted. . At this time, the above-described anchor base plate (110) is fastened to the wall surface of the ship body by welding or bonding. The thickness of the anchor base plate (110) described above is the same as the thickness of the lower plate member (201) of the secondary heat insulating wall of the planar portion described above.

  In succession, as shown in FIG. 14, the anchor lower plate is placed on the upper portion of the anchor base plate (110) so as to cover the protruding portion of the lower plate member (201) of the secondary heat insulating wall of the flat portion. (111) is fastened. Therefore, a through hole is formed in the anchor lower plate (111) at a position corresponding to the stud pin (109), and the stud pin (109) penetrating the anchor lower plate (111) is formed. The anchor base plate (110) is fixed by fastening the nut.

  Thus, although the lower plate member (201) of the planar structure (200) is fixed by the fixed base (101) or the anchor lower plate (111), the upward movement is restricted. Some horizontal sliding is possible in the horizontal direction. That is, the anchor lower plate (111) prevents the planar structure (200) formed as a preliminary assembly from moving upward.

  Next, as shown in FIGS. 14 and 15, the anchor support load (112) is vertically fixed to the center portion of the anchor lower plate (111).

  For this purpose, a predetermined groove is formed at the center of the anchor lower plate (111). Further, the anchor base plate (110) is positioned below the anchor lower plate (111).

  At this time, a plurality of through holes corresponding to the stud pins (109) are formed in the anchor base plate (110), and the stud bases (109) are passed through the through holes. Install the plate (110). Next, the stud pin (109) penetrating the anchor base plate (110) is attached with a nut to fix the anchor base plate (110).

  Meanwhile, the load support cap (120) is installed in the groove of the anchor lower plate (111) through a hole formed in the center of the anchor base plate (110). The above-mentioned load support cap (120) includes a nut inside, or the structure of the nut is integrally formed. In the present invention, the central portion of the load support cap (120) is a nut. The anchor support load (112) is vertically fastened to the load support cap (120).

  Here, the load support cap (120) and the nut are similar to the load support cap (61) and the fixing nut (62) shown in FIG.

  Here, although the above-described anchor support load (112) may generate heat transfer at the top or the bottom, the diameter of the above-mentioned anchor support load (112) and the heat transfer rate as another component are considered at the time of design. Therefore, it is desirable to minimize heat transfer from the liquefied natural gas in the tank to the hull.

  Such an anchor support load (112) serves to primarily support a load generated from a primary sealing wall to be attached in a later process, and a pre-assembly (planar structure) of a heat insulating wall serves as a primary sealing wall. And because there is almost no direct connection with adhesive (P) etc., unlike the conventional heat insulation wall, some sliding is allowed for the primary sealing wall, so the tank structure safety against deformation of the hull etc. Will increase.

  Each planar structure (200) is fixed around the anchor lower plate (111) and the anchor support load (112) of the present invention by the fixing method as described above. At this time, the lower plate member (201) of the planar structure (200) is fixed in a gap formed by the inner surface (1) of the hull and the anchor lower plate (111).

  The above-described planar structure (200) is introduced into the hull in a state assembled in advance outside the hull, and the primary heat insulating wall (204) of the planar portion of such a planar structure (200) is provided. An upper plate (205) is bonded to the upper part.

  That is, a lower plate member (201) of a flat secondary heat insulating wall facing the inner surface (1) of the hull is prepared, and a secondary heat insulating wall (202) of a flat surface made of polyurethane foam is attached to the upper surface. Then, the secondary sealing wall (203) of the flat part made of aluminum sheet or flexible sheet (Triplex) material is attached to the upper face again, and the primary heat insulating wall of the flat part made of polyurethane foam material is attached to the upper face. (204) and an upper plate (205) made of a plywood material is attached to the upper surface thereof.

  In addition, the lower plate material (201) and the secondary sealing wall (203) of the secondary heat insulating wall of the above-described flat portion slightly protrude from the side surfaces of the primary and secondary heat insulating walls (202, 204), and are adjacent in the subsequent process. The planar structure (200) or the corner structure (100) is fixed to the secondary sealing wall by mutual fastening, and the corner portion on the opposite surface in contact with the corner structure (100) is the anchor structure of the present invention. It is assembled and fixed by the body (150) and is formed in a partially cut shape. The planar structure (200) according to the present invention having such a structure is manufactured to have the same height as the adjacent corner structure (100).

  In the present invention, the planar structure (200) pre-assembled in the present invention is fixed to the inner surface of the hull. Secondary insulation of the planar portion is provided on the other side of the fixing base for fixing the corner structure (not shown) to the protruding member. The lower plate member (201) of the secondary heat insulating wall of the flat portion protruding from the side surface of the wall (202) is inserted, and the two of the flat portion protruding from the opposite corner portion in contact with the corner structure (100) are inserted. A gap formed by a metal anchor base plate (110) fixed to the hull inner surface (1) and a plywood anchor lower plate (111) fixed to the upper surface of the lower heat insulating wall lower plate material (201). It is fixed by the method inserted in.

  As described above, when the above-described planar structure (200) is inserted and fixed around the anchor lower plate (111) and the anchor support load (112) forming the anchor structure of the present invention, FIGS. As shown in Fig. 8, the secondary heat insulating wall (113) of the anchor portion is inserted. The secondary sealing wall (114) of the anchor part in which a circular wrinkle part (115) is formed is positioned on the upper surface of the secondary heat insulating wall (113) of the anchor part. The sealing wall (114) is supported by a plate member (121) formed on the anchor support load (112), and is firmly fixed by a fixing nut (123) bolted to the support load (112) after insertion. .

  When the position of the planar structure (200) is fixed, as shown in FIGS. 15 to 22, the secondary heat insulating walls (53, 202) of the corner structure (100) and the planar structure (200) are obtained. ) Is filled with a heat insulating material made of polyurethane foam material, and the secondary heat insulating wall (113) of the anchor portion and the secondary sealing wall (114) of the anchor portion are inserted into the anchor support load (112). To come.

  The secondary heat insulating wall (113) of the anchor part is a heat insulating material made of polyurethane foam and a plate material made of plywood, and has a square cross section and is attached and fixed to the upper surface of the secondary sealing wall of the anchor part. (114) is made of aluminum sheets or flexible sheets (Triplex).

  When the LNG storage tank configured as described above is subjected to partial stress due to the phenomenon that the hull bends due to waves, etc. during the movement of the ship, the deformation of the hull will cause the insulation and the secondary sealing wall to The stress imposed is increased. Thus, in order to reduce the stress generated in the sealing wall, a circular wrinkle portion (115) is formed on the secondary sealing wall (114) of the anchor portion as shown in FIG. Better. That is, the wrinkle portion (115) extends or contracts in the sliding movement direction of the planar structure (200) when the planar structure (200) slides, and is applied to the heat insulating material or the sealing wall. Prevent mechanical or thermal deformation.

  Moreover, there exists a tendency for the connection between the above-mentioned planar structures (200) to be performed by the stress which arises in a heat insulation wall layer. At this time, since the planar structure (200) of the storage tank according to the present invention rests on the anchor lower support plate (111) of the anchor structure (150), the sliding tank is slightly slid in a state in which separation is prevented. It is possible to move.

  For the reasons described above, when stress is generated in the hull, the corner structure (100) remains fixed, but each planar structure (200) can partially slide in the horizontal direction when the hull is deformed. And the above-mentioned heat insulation wall layer itself can absorb the deformation of the hull.

  As described above, after the corner structure (100) and each planar structure (200) of the present invention are installed on the inner surface of the hull, heat insulation of polyurethane foam material is formed in the space formed by each secondary heat insulation wall. After the material (211) is inserted, the adjacent secondary sealing walls are connected and fixed by fixing means.

  That is, the secondary sealing wall (52) of the corner structure (100) and the secondary sealing wall (203) of the planar structure (200) adjacent to the corner structure (100) are fixed and the planar structure (200) is adjacent. The secondary sealing wall (203) is fixed to each other, and the secondary sealing wall (203) of the planar structure (200) and the secondary sealing wall (114) of the anchor part adjacent to each other are fixed to each other. Become.

  Further, the space formed by each primary heat insulating wall is filled with a heat insulating material (210) made of polyurethane foam.

  A primary sealing wall (250) is fastened to the top. The primary sealing wall is welded to the anchor portion (preferably Fillet weld), preferably to the anchor upper cap (119). The primary sealing wall is described in detail below.

  FIG. 24 is an enlarged cross-sectional view illustrating a means for attaching a secondary sealing wall in a liquefied natural gas storage tank according to the present invention, and FIG. 25 illustrates a means for attaching a secondary sealing wall in a liquefied natural gas storage tank according to the present invention. FIG. FIG. 26 is an enlarged partial sectional perspective view showing the fastening relationship of the anchor structure in the liquefied natural gas storage tank according to the present invention.

  Here, the fixing method is fixed by fixing means as shown in FIGS. 24 and 25, but such a fixing method is applied to all the secondary sealing walls in the present invention.

  That is, as shown in FIG. 24 as an example, the space portion formed by the primary and secondary heat insulating materials (57, 58) of the corner portion of the present invention and the primary and secondary heat insulating walls (204, 202) of the flat portion. In other words, the lower fixing plate (213) and the upper fixing plate (212) are arranged in the vicinity of the secondary sealing walls (52, 203) protruding in the gaps (that is, the gaps between the heat insulating walls). ) In the form of facing each other, and not limited to this, but if the lower fixing plate (213) and the upper fixing plate (212) are fixed by the fixing bolt (214), The next sealing wall (52, 203) is firmly fixed.

  Here, the lower fixing plate (213) and the upper fixing plate (212) use a metal material.

  Further, the lower fixing plate (213) and the upper fixing plate (212) described above connect and fix the secondary sealing walls (52, 203) in a curved shape, which is the above-described lower fixing plate (213). Further, the facing portions of the upper fixing plate (212) are formed on the curved uneven portions corresponding to each other. Thus, the sealing characteristic of the secondary sealing wall with respect to the leakage of LNG of the primary sealing wall which may occur by the end of the secondary sealing wall being connected by the curve is improved.

  Further, since the fastening body of the lower fixing plate (213) and the upper fixing plate (212) has some bending in the vertical direction, it is desirable that the fastening body has a slightly extra length, and the liquefied natural gas is stored in the storage tank. Even if the temperature is reduced after being put in, it is possible to easily eliminate the load associated with the mechanical / thermal contraction and expansion action, such as providing a margin for absorbing the stress even if the thermal contraction occurs.

  Also, such a fastening structure of the secondary sealing wall can provide a certain degree of freedom to the heat insulating wall by fastening the secondary sealing wall independently of each heat insulating wall and the hull. Damage to the heat insulating wall due to deformation of the inner surface can be prevented.

  As described above, the lower space formed by each corner structure (100) and planar structure (200) is filled with the heat insulating material, and each secondary sealing wall is fixed by the fixing means. Next, the anchor upper plate (117) is inserted into the groove on the upper part of the primary heat insulating wall (116) of the anchor portion, and the anchor heat insulating plate (118) is adhered and fixed again, and a circular anchor upper cap ( 119) is inserted and fixed. For this purpose, a predetermined groove is formed at the upper center of the above-mentioned anchor heat insulating plate (118), and the above-mentioned anchor upper cap (119) is located in the space. The anchor upper cap (119) includes a nut, and the structure of the nut is integrally formed and attached to the upper end of the anchor support load (112) to complete the assembly of the anchor structure (150). To come.

  FIG. 26 is an enlarged partial sectional perspective view illustrating the fastening relationship of the anchor structure in the storage tank for liquefied natural gas according to the present invention. The anchor structure (150) according to the present invention assembled through a series of processes is shown in FIG. It comes to have a fastening structure as shown.

  When the corner structure (100) and the planar structure (200) according to the present invention are installed on the inner surface of the hull through the assembly process described above and the assembly of the anchor structure (150) is completed, as shown in FIG. The space part formed by the primary heat insulating wall (204) formed by the corner structure (100), each planar structure (200) and the anchor structure (150) (upper part of the space part formed by the secondary heat insulating wall) Filled with insulation. Glass wool (Glass Wool) is used as the heat insulating material to be filled at this time, but this is because the thermal stress is more easily eliminated by responding more flexibly to the thermal contraction of the primary heat insulating wall. It is. In addition, there is an effect that the unit of the preliminary assembly can be moved to some extent in accordance with the torsion in the hull when the torsion phenomenon occurs in the hull.

  As described above, after filling the space portion of the primary heat insulating wall formed by each assembly structure with a heat insulating material such as glass wool, the membrane type having a wrinkle portion (251, Corrugation) on its upper surface. The primary sealing wall (250) is attached and fixed. As the material of the primary sealing wall (250), a stainless steel material having excellent corrosion resistance and thermal safety is mainly used.

  On the other hand, the material of the above-mentioned primary sealing wall (250) is known in the conventional Mark III type tank or presented in a patent known by the present applicant (Japanese Patent Application No. 2001-0010438 or 2001-0010152). It is possible to change the shape and shape of the material, and to modify them. Moreover, the primary sealing wall described in US3,299,598; US3,302,359; US3,510,278 etc. can also be used.

  In addition, the wrinkle portion (251) described above is formed in a vertical direction along the space portion formed by each assembly structure (100, 150, 200), and is formed around the wrinkle portion (251) as a peripheral portion. A large number of wrinkle portions (251) are formed. The wrinkle portion (251) described above has the most severe thermal contraction and expansion action of the primary sealing wall (250) in direct contact with the stored liquefied natural gas. It has been devised to eliminate it easily. In addition, the reason why the wrinkle part (251) is formed in the vertical direction is the same as the upper part of the space part formed by each primary heat insulating wall. This is because of the thermal contraction and expansion of the secondary sealing wall attached to the primary heat insulating wall. This is because the thermal stress applied to the storage tank can be easily eliminated in a mutually dependent manner.

  FIG. 27 is a partially cut perspective view of a storage tank for liquefied natural gas according to another embodiment of the present invention.

  According to another embodiment of the present invention, the liquefied natural gas storage tank described above is installed in a space formed inside a structure such as a ship for storing liquefied natural gas, as shown in FIG. The secondary heat insulation wall (292) is installed, and the secondary sealing wall (293) and the primary heat insulation wall (294) formed on the upper surface thereof are installed.

  Here, the above-mentioned primary heat insulating wall (294) includes a predetermined space portion formed at an upper portion between the end portions of the above-described secondary heat insulating wall (292). The connecting heat insulating wall (297) of the flat portion that is connected to the side surface of the primary heat insulating wall (294) and the upper surface of the secondary sealing wall (293) is installed.

  The primary heat insulating wall (276) of the anchor portion is installed at the center of the connecting heat insulating wall (297) of the flat surface portion, and the primary heat insulating wall (297) of the flat surface portion and the primary heat insulating wall of the anchor portion ( 276) is filled with a heat insulating material including glass wool.

  As described above, a manufacturing process of a liquefied natural gas storage tank according to another embodiment is as follows.

  FIGS. 28 to 36 are perspective views sequentially illustrating a process of assembling a storage tank for liquefied natural gas according to another embodiment of the present invention in the interior space of the hull.

  For the purpose of description of the present specification, the same reference numerals are used for the same constituent elements even if they are shown on different drawings. pay attention to.

  In the beginning, in another embodiment of the present invention, the process of fixing the planar structure or the corner structure is as described in the previous embodiment, and the same process is omitted in the other embodiments of the present invention.

  Through the above-described process, as shown in FIGS. 28 and 29, the above-described planar structure centering on the anchor lower plate (111) and the anchor support load (112) forming the anchor structure (150) of the present invention. When (200) is inserted and fixed, the secondary heat insulating wall (113) of the anchor portion is inserted.

  The secondary sealing wall (114) of the anchor part in which the circular wrinkle part (115) is formed is positioned on the upper surface of the secondary heat insulating wall (113) of the anchor part. The wall (114) is supported by a plate (121) formed on the anchor support load (112), and after being inserted, the wall (114) is firmly fixed by a fixing nut (123) that is bolted to the anchor support load (112). The

  In addition, referring to FIG. 30, it is fixed to the side surface of the primary heat insulating wall (294) of each planar portion arranged adjacent to the upper portion of the secondary heat insulating wall (292) of the planar portion located adjacent to the lower portion thereof. The upper surface of the formed secondary sealing wall (293) is provided with a flat connecting heat insulating wall (297). In the embodiment of the present invention, the flat connecting heat insulating wall (297) is the flat surface portion. Are fixed to the upper surface of the secondary sealing wall (293) or the secondary sealing wall (114) of the anchor portion with an adhesive (P). Accordingly, the planar structure (200) formed in the preliminary assembly is restricted from moving upward by the anchor lower plate (111) at the lower end of the anchor portion. On the other hand, since the wrinkle portion is formed around the secondary sealing wall (114) of the anchor portion, the planar structure (200) is laterally moved in a state where the upward movement is restricted by the anchor lower plate (111). Even if it moves slightly in the direction, the secondary sealing wall can absorb the movement.

  In this way, the connection heat insulating wall (297) and the secondary sealing walls (114, 293) of the above-described flat portion are more strongly fastened by the adhesive (P).

  At this time, the connecting heat insulating wall (297) of the flat part can form a gap (1 to 4 mm) spaced apart from the side surface of the primary heat insulating wall (294) of the adjacent flat part by a certain distance. The gaps formed in (1) provide a space in which the above-described planar structure (200) can flow when the above-mentioned hull is deformed to absorb the deformation.

  In addition, the connecting heat insulating wall (297) of the above-described flat part is positioned above the secondary sealing wall (293) of the adjacent flat part, and is connected to the secondary sealing wall (114) of the above-described anchor part and the two of the flat part. The end of the next sealing wall (293) is fixed. As a result, the connecting heat insulating wall (297) of the above-described flat portion is strongly bonded to the secondary sealing wall (293) of the following flat portion or the secondary sealing wall (114) of the above-described anchor portion with the adhesive (P). The Therefore, in the unlikely event that the primary sealing wall breaks, the liquefied natural gas reaches the connecting portion of the above-mentioned planar secondary sealing wall (293) or the secondary sealing wall (114) of the anchor portion. Therefore, leakage of liquefied natural gas can be reliably blocked.

  As described above, after each secondary sealing wall (114, 293) is fixed by the fixing means, the primary heat insulating wall (116) of the anchor portion is attached to the anchor support load (112) according to the procedure shown in FIGS. ) And an anchor upper plate (337) is inserted into the circular depression formed on the upper surface of the primary heat insulating wall (116) of the anchor portion to the upper end of the anchor support load (112). Fix it.

  Next, an anchor heat insulating plate (338) is further adhered and fixed to the upper surface, and a further circular anchor upper cap (339) is inserted and fixed to the center. For this reason, a predetermined groove is formed in the upper center of the anchor heat insulating plate (338), and the anchor upper cap (339) is positioned in the space. The above-mentioned anchor upper cap (339) includes a nut, or the structure of the nut is integrally formed and attached to the upper end of the above-mentioned anchor support load (112), thereby assembling the anchor structure (150). Work will be completed.

  Through the above-described assembly process, a heat insulating material is formed in the space portion (the upper portion of the space portion formed by the secondary heat insulating wall) of the primary heat insulating walls (276, 297) formed by the anchor structure and the planar structure (200) according to the present invention. Can be filled with. Glass wool (Glass Wool, 325) can be used as a heat insulating material to be filled at this time, and this is flexible and thermally corresponding to the thermal contraction of the primary heat insulating wall (276, 297). This is because the stress is more easily eliminated.

  After filling the space formed by the primary heat insulating walls (276, 297) with a heat insulating material such as glass wool (325), as shown in FIG. 36, the membrane having a wrinkle (251) on the upper surface thereof The primary sealing wall (250) of the mold is attached and fixed. As the material of the primary sealing wall (250), a stainless steel material having excellent corrosion resistance and thermal safety can be mainly used.

  Further, the material of the primary sealing wall (250) described above is known in the conventional Mark III type tank, and is presented in a patent known by the present applicant (Japanese Patent Application No. 2001-0010438 or 2001-0010152). The material can be made of any of the above materials, and the shape can be modified.

  37 and 38 are cross-sectional views showing enlarged views of a state in which a secondary sealing wall is attached in the liquefied natural gas storage tank according to the present invention.

  Here, the above-described method of fixing the secondary sealing wall (293) of the flat portion is fixed by the same fixing means as shown in FIGS. 37 and 38, and these fixing methods are all of the present invention. All are applied to fix the secondary sealing wall (293) of the flat part.

  That is, as illustrated in FIG. 37 as an example, in the present invention, the secondary sealing wall (293) of each planar portion protruding into the space formed by the primary and secondary heat insulating walls (292, 294) of the adjacent planar portion in the present invention. The upper connecting member (312) and the lower connecting member (313) that are fastened so that the end portion of the secondary sealing wall (293) of the above-described flat surface is in contact with a portion close to each other without a gap are installed.

  Further, the secondary sealing wall (293) of the above-described flat portion is applied with a resin material (293a) on the upper surface and the lower surface, respectively, and is extended to the space portion formed by the adjacent heat insulating wall.

  At this time, although not particularly limited, when the lower connecting member (313) and the upper connecting member (312) are fixed by the direct connection bolt (314), the secondary sealing wall (293) of the flat portion is firmly fixed. The Further, for this purpose, a through-hole (297a) for inserting the above-mentioned direct connection bolt (314) is formed in the above-mentioned connecting heat insulating wall (297) of the flat portion.

  Here, the fixing bolt or the fixing bolt (314) described above has a structure in which the upper connecting member (312) or the lower connecting member (313) is directly penetrated and fastened to form a separate bolt fastening hole. It is possible to work in a state where no For example, a direct drilling screw can be used.

  The fixing bolt (314) includes a flat washer (314a) or a spring washer (314b), and the upper portion of the heat insulating material is maintained in a compressed state. To come. Here, it is preferable that the fixing bolt (314) is attached in consideration of the volume of the heat insulating material due to the expansion pressure of LNG, that is, the thickness reduction amount.

  On the other hand, a groove for accommodating the secondary sealing wall (293) of the flat portion is formed on the fastening surface of the upper connecting member (312) and the lower connecting member (313). Moreover, the uneven | corrugated | grooved part (312a, 313a) formed so that it may mutually oppose or non-opposite is formed in the both ends of the above-mentioned groove | channel. When the upper connecting member (312) and the lower connecting member (313) are fixed by the fixing bolt (314), the uneven portions (312a, 313a) are applied to the secondary sealing wall (293) of the flat portion. The pressed resin material (293a) is squeezed.

  At this time, the above-described resin material (293a) is accommodated in the recesses between the above-described concavo-convex portions (312a, 313b), and the above-described planar sealing wall (293) and the above-described upper connecting member (312). Or the clearance gap between lower connection members (313) is sealed. Here, the above-mentioned resin material (293a) is made of a curable resin, and is cured after being squeezed.

  Therefore, the sealing characteristic of the secondary sealing wall (203) with respect to gas leakage due to the breakage of the primary sealing wall (250) that may occur may be improved.

  The present invention is applied to specific embodiments as illustrated in the above-described drawings, and the present invention is not limited to these specific embodiments, and variously within a range not departing from the technical idea of the present invention. It is also possible to carry out with modification.

  Further, the present invention can be applied not only to a liquefied natural gas storage tank installed in the hull, but also to a liquefied natural gas storage tank installed on land.

FIG. 1 is a cross-sectional view illustrating a conventional membrane-type liquefied natural gas storage tank GTT NO 96-2. FIG. 2 is a perspective view illustrating a GTT NO 96-2 type, which is a conventional membrane type liquefied natural gas storage tank. FIG. 3 is a sectional view illustrating a GTT Mark III type, which is a conventional membrane type liquefied natural gas storage tank. FIG. 4 is a perspective view illustrating a GTT Mark III type, which is a conventional membrane type liquefied natural gas storage tank. FIG. 5 is a cross-sectional view illustrating the structure of a corner portion of a conventional LNG storage tank. 6A and 6B are cross-sectional views illustrating the internal structure of a corner structure constituting a storage tank for liquefied natural gas according to an embodiment of the present invention. FIG. 7 is an overall perspective view illustrating the connection relationship of the corner structure of the storage tank for liquefied natural gas installed inside the ship according to the present invention. FIG. 8 is a partially enlarged cross-sectional perspective view illustrating a corner structure of a liquefied natural gas storage tank installed in a ship according to an embodiment of the present invention. FIG. 9 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into an interior space of a hull. FIG. 10 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into an interior space of a hull. FIG. 11 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into an interior space of a hull. FIG. 12 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into the interior space of a hull. FIG. 13 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into an interior space of a hull. FIG. 14 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into an interior space of a hull. FIG. 15 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into an interior space of a hull. FIG. 16 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into an interior space of a hull. FIG. 17 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into an interior space of a hull. FIG. 18 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into the interior space of a hull. FIG. 19 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into an interior space of a hull. FIG. 20 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into an interior space of a hull. FIG. 21 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into an interior space of a hull. FIG. 22 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into the interior space of a hull. FIG. 23 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to an embodiment of the present invention is incorporated into an interior space of a hull. FIG. 24 is an enlarged cross-sectional view illustrating a means for attaching a secondary sealing wall of a storage tank for liquefied natural gas according to an embodiment of the present invention. FIG. 25 is an enlarged perspective view illustrating a means for attaching the secondary sealing wall of the storage tank for liquefied natural gas according to an embodiment of the present invention. 26 (a) and 26 (b) are partial cross-sectional perspective views illustrating enlarged fastening relationships of anchor structures of a liquefied natural gas storage tank according to an embodiment of the present invention. FIG. 27 is a partially cut perspective view of a storage tank for liquefied natural gas according to another embodiment of the present invention. FIG. 28 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to another embodiment of the present invention is incorporated in the interior space of the hull. FIG. 29 is a perspective view sequentially illustrating a process of incorporating a storage tank for liquefied natural gas according to another embodiment of the present invention into the interior space of the hull. FIG. 30 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to another embodiment of the present invention is incorporated into the interior space of the hull. FIG. 31 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to another embodiment of the present invention is incorporated into the interior space of the hull. FIG. 32 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to another embodiment of the present invention is incorporated into the interior space of the hull. FIG. 33 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to another embodiment of the present invention is incorporated in the interior space of the hull. FIG. 34 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to another embodiment of the present invention is incorporated into the interior space of the hull. FIG. 35 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to another embodiment of the present invention is incorporated in the interior space of the hull. FIG. 36 is a perspective view sequentially illustrating a process in which a storage tank for liquefied natural gas according to another embodiment of the present invention is incorporated in the interior space of the hull. FIG. 37 is an enlarged cross-sectional view illustrating a state diagram for attaching the secondary sealing wall of the storage tank for liquefied natural gas according to the present invention. FIG. 38 is an enlarged cross-sectional view illustrating a state diagram for attaching the secondary sealing wall of the storage tank for liquefied natural gas according to the present invention. FIG. 39 is a cross-sectional view of a ship provided with a liquefied natural gas storage tank according to the present invention. 40 is a partially enlarged view of the heat insulation system of FIG. FIG. 41 is a diagram illustrating a connection state of the secondary sealing wall from the anchor portion.

Explanation of symbols

50 corner support plate 51 primary heat insulating wall of corner 52 secondary sealing wall of corner 53 secondary heat insulating wall of corner 54, 56 plate material 57, 58 heat insulating material 60 lower support load 61 load support cap (Cap)
70 Upper support load 80, 81 Projection member at corner 90 Connection reinforcement base 100 Corner structure 101 Fixing base 109 Stud Pin
DESCRIPTION OF SYMBOLS 110 Anchor base board 111 Anchor lower board 113 Secondary insulation wall of anchor part 114 Secondary sealing wall of anchor part 115 Wrinkle part 119 Anchor upper cap 150 Anchor structure 200 Planar structure 201 Lower board material 202 Secondary insulation wall of plane part 203 Secondary sealing wall of flat part 204 Primary heat insulating wall of flat part 205 Upper plate material 211 Heat insulating material 212 Upper fixing plate 213 Lower fixing plate 214 Fixing bolt 250 Primary sealing wall 251 Wrinkle part 3900 Ship 3901 Ship outer wall (outer shell)
3903 Hull inner wall (inner shell)
3907 Bulkhead 3915 Anchor structure 3917 Intermediate wall structure 3917 (100) Corner structure 3917 (200) Planar structure

Claims (23)

  A module for manufacturing a storage tank for liquefied natural gas, characterized in that, as a heat insulation module used in a storage tank for liquefied natural gas, a lower end portion thereof protrudes to facilitate assembly between adjacent modules. The module includes a primary insulation wall;
A secondary sealing wall adhered to the lower portion of the primary heat insulating wall with an adhesive;
The module for manufacturing a storage tank for liquefied natural gas according to claim 1, wherein the module is composed of a secondary heat insulating wall bonded to the lower part of the secondary sealing wall with an adhesive.   2. The liquefied natural gas storage tank manufacturing method according to claim 1, wherein the module includes a plurality of planar structures positioned at a plane portion of the tank and a plurality of corner structures positioned at a corner portion. Modules.   The module for manufacturing a storage tank for liquefied natural gas according to claim 3, wherein the planar structure forms a quadrangular prism, and one or more corner portions are partially cut. The module includes a primary insulation wall;
An upper plate attached to the upper part of the primary heat insulating wall;
A secondary sealing wall attached to a lower portion of the primary heat insulating wall;
A secondary heat insulating wall attached to a lower portion of the secondary sealing wall;
It consists of a lower plate attached to the lower part of the secondary heat insulating wall,
The module for manufacturing a storage tank for liquefied natural gas according to claim 1, wherein the lower plate member is extended at one or more side surfaces of the secondary heat insulating wall to form a flange.   6. The module for manufacturing a liquefied natural gas storage tank according to claim 5, wherein the primary or secondary heat insulating wall, the sealing wall, and a portion where the upper and lower plate members are in contact are bonded with an adhesive.   The module for manufacturing a liquefied natural gas storage tank according to claim 6, wherein the secondary sealing wall protrudes from one or more side surfaces of the primary and secondary heat insulation walls.   The module for manufacturing a storage tank for liquefied natural gas according to claim 7, wherein the secondary sealing wall is liquid-tightly connected to each other.   The module for manufacturing a storage tank for liquefied natural gas according to claim 8, wherein the heat insulating wall is polyurethane foam. The primary sealing wall is in direct contact with the liquefied natural gas stored in the storage tank, and includes a primary insulating wall and a secondary wall in the lower part. In liquefied natural gas storage tanks placed in the procedure of sealed walls and secondary insulation walls,
The primary sealing wall is supported by an anchor portion mechanically fastened to the bottom surface of the tank,
A plurality of modules according to claim 1, wherein each module slides between at least one of the primary sealing wall and the tank bottom surface between the primary sealing wall and the tank bottom surface. A storage tank for liquefied natural gas, characterized in that it is installed so that it can be sliding.   The liquefied natural gas storage tank according to claim 10, wherein the module is manufactured as a pre-assembly and is assembled based on the anchor portion to constitute a heat insulation system.   The liquefied natural gas storage tank according to claim 11, wherein the primary sealing wall is fastened to an upper end of the anchor portion by welding.   The liquefied natural gas storage tank according to claim 12, wherein the upper end of the anchor part is an end of an anchor support load installed in the anchor part or an anchor upper cap fastened to the anchor support load. The secondary sealing wall is extended to a side space formed by the heat insulating wall,
The end of the extended secondary sealing wall is fastened by an upper fixing plate and a lower fixing plate,
The liquefied natural gas storage tank according to claim 13, wherein the fastening surfaces of the upper fixing plate and the lower fixing plate include a groove formed so that an end of the secondary sealing wall can be inserted. A corner structure located at a corner inside the tank;
A module positioned for sliding movement on a plane inside the tank;
The liquefied natural gas storage tank according to claim 10, further comprising an anchor structure that fastens to a bottom surface of the tank and attaches the module to the inside of the tank.   The module is manufactured in a pre-assembly in which a flat secondary heat insulating wall, a flat secondary sealing wall formed on an upper surface thereof, and a flat primary heat insulating wall formed on an upper surface thereof are installed. The liquefied natural gas storage tank according to claim 15, wherein:   The corner structure has a secondary heat insulating wall of a corner portion formed in an L shape so as to be in contact with a corner point where the two surfaces of the tank meet, and a secondary sealing wall of a corner portion formed on an upper surface thereof. And a primary heat insulating wall of the corner portion formed on the upper surface thereof, and a spare L-shaped corner support plate installed on the upper surface of the primary heat insulating wall of the corner portion so as to receive the load of the storage tank. The liquefied natural gas storage tank according to claim 15, wherein the liquefied natural gas storage tank is manufactured as an assembly and fixed by protruding members at corner portions respectively formed on the inner surface of the tank.   The liquefied natural gas storage tank according to claim 16, wherein the corner support plate is installed to be slidable on the primary heat insulating wall of the corner so as to be contracted and extended by heat.   In the corner structure, the secondary heat insulating wall and the primary heat insulating wall are connected and fixed to the upper end portion of the lower support load protruding through the secondary heat insulating wall and the lower end portion of the upper support load passing through the primary heat insulating wall. 19. The storage tank for liquefied natural gas according to claim 18, wherein the storage tank is mechanically fastened by a connecting reinforcing base.   The liquefied natural gas storage tank according to claim 19, wherein the upper support load passes through the primary heat insulating wall and is fastened to the corner support plate to support the corner support plate.   21. The liquefied natural gas storage tank according to claim 20, wherein the upper support load is fastened to the corner support plate by welding.   The liquefied natural gas storage tank according to claim 21, wherein the primary sealing wall is fastened to the upper end of the anchor portion by welding.   In the module, the flange projecting at the lower end of the planar structure located in the planar portion of the tank is inserted into the gap formed between the lower portion of the anchor portion and the bottom surface of the tank, and the upward movement is 23. The storage tank for liquefied natural gas according to one of claims 10 to 22, wherein the storage tank is slidable in a horizontal direction although it is limited.

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