KR101766384B1

KR101766384B1 - Anchor structure, lng storage tank and producing method thereof

Info

Publication number: KR101766384B1
Application number: KR1020150174777A
Authority: KR
Inventors: 김영균; 윤인수; 이영범; 차규상; 김주신
Original assignee: 한국가스공사
Priority date: 2015-12-09
Filing date: 2015-12-09
Publication date: 2017-08-09
Also published as: KR20170068048A

Abstract

The present invention relates to an anchor structure capable of efficiently supplying nitrogen gas between a primary sealing wall and a secondary sealing wall, a liquefied natural gas storage tank including an anchor structure, and a method of manufacturing a liquefied natural gas storage tank. According to an embodiment of the present invention, there is provided an anchor structure for connecting an inner wall of a liquefied natural gas storage tank with a primary sealing wall and a secondary sealing wall, wherein nitrogen is supplied between the primary sealing wall and the secondary sealing wall An anchor member including a nitrogen supply nozzle for supplying nitrogen; And a heat insulating material formed around the anchor member, wherein the primary sealing wall is in direct contact with the liquefied natural gas and the secondary sealing wall is located under the primary sealing wall, and the anchor member is provided with the primary sealing wall And the secondary sealing wall is bonded to the anchor structure.

Description

TECHNICAL FIELD [0001] The present invention relates to a liquefied natural gas storage tank including an anchor structure, an anchor structure, and a liquefied natural gas storage tank,

The present invention relates to a liquefied natural gas storage tank including an anchor structure, an anchor structure, and a method for manufacturing a liquefied natural gas storage tank, and more particularly, to a method for efficiently supplying nitrogen gas between a primary sealing wall and a secondary sealing wall An anchor structure, an anchor structure, and a method for manufacturing a liquefied natural gas storage tank.

In general, Liquefied Natural Gas (LNG) is a liquefied natural gas, which is one of the fossil fuels. Liquefied natural gas storage tanks are installed on the ground or buried in land, And portable storage tanks installed in transportation means such as ships.

The above-mentioned liquefied natural gas has a danger of explosion when exposed to impact, and is stored at a very low temperature. The storage tank for storing the liquefied natural gas has a structure in which impact resistance and liquid tightness are maintained firmly.

In contrast to terrestrial storage tanks which have little flow, the liquefied natural gas storage tanks installed in ships with a flow must take measures against mechanical stress due to flow. However, since a liquefied natural gas storage tank installed in a vessel provided with a measure against mechanical stress can be used for a land storage tank as a matter of course, the structure of a liquefied natural gas storage tank installed in a ship will be described as an example.

First, an example of a liquefied natural gas storage tank according to the prior art will be described with reference to FIG.

1 is a view showing a part of an example of a liquefied natural gas storage tank according to the prior art.

1, the liquefied natural gas storage tank 10 is provided with secondary insulation walls 22, 42 and primary insulation walls 24, 44 sequentially on the bottom surface of the hull, Secondary sealing walls 23 and 43 are provided between the heat insulating walls 22 and 42 and the primary heat insulating walls 24 and 44 to seal them therebetween. Further, a primary sealing wall 50 is provided on the upper part of the primary heat insulating walls 24, 44.

The liquefied natural gas storage tank 10 constructed as described above includes a corner structure 20 provided at an inner corner portion thereof, an anchor structure 30 provided at a predetermined interval on the bottom surface thereof, And a planar structure 40 inserted between the structures 30 so as to be slidably installed. At this time, the corner structure 20, the anchor structure 30, and the planar structure 40 are assembled in the storage tank 10 after being previously manufactured as respective unit modules, and the primary sealing wall 50, (LNG) can be stored in the inner space by providing the insulating wall with liquid-tightness.

The corner structure 20, the anchor structure 30 and the planar structure 40 are fixed to the respective primary insulation walls 24, 34 and 44, the secondary insulation walls 22, 32 and 42, 23, and 43, which are collectively referred to as the heat insulating wall structures 20, 30, and 40.

On the other hand, each of the heat insulating wall structures (20, 30, 40) is formed integrally with the secondary sealing walls of the unit modules and the contact surfaces of the heat insulating walls by bonding with an adhesive. Typically, the secondary insulation walls 22 and 42 are made of a polyurethane foam, which is an insulating material, and a plate material attached to the lower part thereof. The primary heat insulating walls 24 and 44 are made of a polyurethane foaming material and a plate material adhered thereon with an adhesive. The primary heat insulating walls 24, 34, and 44 are installed on the secondary heat insulating walls 22, 32, and 42, respectively.

A flange 42a is formed at a lower end of the secondary heat insulating wall 42 of the planar structure 40 so as to be larger than the secondary heat insulating wall 42. [ The flange 42a is inserted into a groove formed in the lower end of the anchor structure 30, and is installed to be capable of sliding movement.

In the illustrated example, each anchor structure 30 has an anchor support rod 36, a lower fixing member 37, an anchor secondary insulation wall 32, and an anchor primary insulation wall 34, and the anchor 2 Secondary sealing walls (23, 43) are connected between the secondary insulation wall (32) and the anchor primary insulation wall (34). One end of the anchor support rod 36 is connected to the primary sealing wall 50 and the other end is connected to the inner hull wall 420 by the fixing member 37.

Meanwhile, the anchor structure 30 is welded to the upper end of the anchor support rod 36 by welding the primary seal wall 50.

The anchor structure 30 is located at the connection point of the adjacent planar structures 40 and interconnects the planar structures 40. The planar structure 40 includes a hull inner wall 420 or a partition wall 440 . Further, the fixing member 37 of the anchor structure 30 is provided around the anchor support rod 36. [

Next, another example of a liquefied natural gas storage tank according to the prior art will be described with reference to Figs. 2 and 3. Fig. 2 is a view showing an anchor member of a liquefied natural gas storage tank of another example according to the prior art, and Fig. 3 is a view showing a part of a liquefied natural gas storage tank of another example according to the prior art.

As shown in FIG. 2, the anchor member 110 of another example of the liquefied natural gas storage tank according to the prior art has a truncated conical shape in which the upper portion is formed flat. The truncated conical anchor member 110 has a body whose upper surface side is closed and whose lower surface side is open, and which becomes wider toward the inner surface of the storage tank.

A fixing portion 112 for fixing the anchor member 110 is formed on a lower surface of the conical body 111 of the anchor member 110 on the inner surface of the storage tank, that is, the inner wall or the surface of the partition.

A plurality of through holes 112a are formed in the fixing portion 112 at predetermined intervals so that a plurality of stud bolts fixedly mounted on the inner surface of the storage tank 10 are formed in the through holes 112a, (61) may be respectively inserted and fixed by the nuts (62).

A step is formed on the upper part of the conical body 111 of the anchor member 110 to form two bonding portions 113 and 114. The first bonding film 113 is welded to the first bonding film 113 And the second sealing film 52 is fixedly welded to the second bonding portion 114. As shown in Fig.

The liquefied natural gas storage tank according to the prior art of FIG. 1 has a structure of a heat insulating wall structure composed of primary and secondary heat insulating walls and primary and secondary sealing walls, so that the structure is complicated and a structure for connecting the secondary sealing walls It is complicated, and the operation of the heat insulating wall is not easy. In addition, there is a concern that the structure and installation work of the connecting portion of the anchor portion and the secondary sealing wall are complicated and the reliability of the sealing of the LNG is reduced in the secondary sealing wall.

In the liquefied natural gas storage tanks according to the prior art of Figs. 2 and 3, since the joints and the fixing portions of the anchor members are fixed, the active countermeasures due to the deformation of the hull and the stress concentration of the LNG- , There is a problem that the shape of the anchor member is complicated and the preparation thereof is deteriorated.

Registration No. 10-0499710 (registered on Jun. 28, 2005)

It is an object of the present invention to provide an insulation system capable of efficiently supplying nitrogen between a primary sealing wall and a secondary sealing wall and improving the ease of installation and preparation of the installation and of actively coping with hull deformation and receiving a load of LNG An anchor structure capable of eliminating stress concentration, a liquefied natural gas storage tank including an anchor structure, and a method for manufacturing a liquefied natural gas storage tank.

According to an aspect of the present invention, there is provided an anchor structure for connecting an inner wall of a liquefied natural gas storage tank with a primary sealing wall and a secondary sealing wall, the anchor structure including a primary sealing wall, An anchor member including a nitrogen supply nozzle for supplying nitrogen between the walls; And a heat insulating material formed around the anchor member, wherein the primary sealing wall is in direct contact with the liquefied natural gas and the secondary sealing wall is located under the primary sealing wall, and the anchor member is provided with the primary sealing wall And the secondary sealing wall is bonded to the anchor structure.

In particular, the nitrogen supply nozzle may include a corrugated tube.

Further, the anchor member may include an anchor support plate positioned at an upper portion of the heat insulating material; A first joint located at an upper portion of the anchor support plate and to which the secondary seal wall is bonded; And a second joint positioned above the first joint and to which the primary seal wall is bonded.

Further, the nitrogen supply nozzle may further include a bell tube cover surrounding the bell tube, and the bell tube cover may be welded to the anchor support plate.

The second joint may be configured to be slidable in a horizontal direction.

The first joint portion may include a first cap portion to which the secondary sealing wall is joined and a first flange portion that extends radially from a lower end of the first cap portion. The first flange portion abuts on the anchor support plate It may not be fixed to the anchor support plate.

The anchor member may further include an anchor support cap having a second cap portion and a second flange portion radially extending from a lower end of the second cap portion. The second flange portion covers the first flange portion, An edge of the flange portion can be fixed to the anchor support plate by welding.

In addition, the upper portion of the nitrogen supply nozzle may be filled with a grass wool.

Further, a supporting plate may be provided between the primary sealing wall and the secondary sealing wall to maintain a constant distance between the primary sealing wall and the secondary sealing wall.

According to an aspect of the present invention, there is provided a storage tank for storing liquefied natural gas, comprising: an insulating wall formed on an inner wall of the storage tank to form a heat insulating layer; A primary sealing wall contacting the liquefied natural gas and contacting the liquefied natural gas; A secondary sealing wall located below the primary sealing wall and sealing the liquefied natural gas when the primary sealing wall leaks; And an anchor structure for connecting an inner wall of the storage tank with the primary sealing wall and the secondary sealing wall, the anchor structure including a nitrogen supply nozzle for supplying nitrogen between the primary sealing wall and the secondary sealing wall, And an anchor member including the anchor member.

In particular, the nitrogen supply nozzle may include a corrugated tube.

The anchor structure may further include a heat insulating material formed around the anchor member, wherein the anchor member includes an anchor supporting plate positioned on the heat insulating material; A first joint located at an upper portion of the anchor support plate and to which the secondary seal wall is bonded; And a second joint positioned above the first joint and to which the primary seal wall is bonded.

The second joint may be configured to be slidable in a horizontal direction.

According to another aspect of the present invention, there is provided a method of manufacturing a liquefied natural gas storage tank, comprising: providing an insulating wall including an anchor structure on an inner wall of the storage tank; Fixing the secondary sealing wall to the first joint portion of the anchor structure and installing the secondary sealing wall on the upper surface of the heat insulating wall; Securing a second abutment on top of the first abutment; Wherein the anchor structure includes a nitrogen supply nozzle for supplying nitrogen between the primary sealing wall and the secondary sealing wall, and a second sealing wall for fixing the primary sealing wall to the second sealing portion, A method for manufacturing a liquefied natural gas storage tank is provided, including an anchor member.

In particular, the nitrogen supply nozzle may include a corrugated tube.

The second joint may be configured to be slidable in a horizontal direction.

According to the embodiment of the present invention, a nitrogen supply nozzle is provided in the anchor member to efficiently supply nitrogen between the primary sealing wall and the secondary sealing wall, and the upper portion of the nitrogen supply nozzle is a corrugated pipe, So that breakage of the nitrogen supply nozzle can be prevented.

The joining portion of the anchor member joined with the sealing wall can be slid horizontally to actively cope with the deformation of the hull, and the lower portion of the anchor support rod can be moved up and down, Stress concentration can be solved.

1 is a view showing a part of an example of a liquefied natural gas storage tank according to the prior art.
2 is a view showing an anchor member of a liquefied natural gas storage tank of another example according to the prior art.
3 is a view showing a part of a liquefied natural gas storage tank of another example according to the prior art.
4 is a cross-sectional view of an exemplary vessel equipped with a liquefied natural gas storage tank according to an embodiment of the present invention.
5 is a plan view of an anchor structure according to an embodiment of the present invention.
6 is a sectional view taken along the line A-A 'in Fig.
7 is a cross-sectional view taken along line B-B 'in FIG.
8 is a cross-sectional view of an anchor member according to an embodiment of the present invention.
9 is a view illustrating a process of assembling an anchor member according to an embodiment of the present invention.
10 is an enlarged view of a portion C in Fig.
11 is a flowchart illustrating a method of manufacturing a liquefied natural gas storage tank according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

First, referring to FIG. 4, a structure of a ship having a liquefied natural gas storage tank according to an embodiment of the present invention will be described. 4 is a cross-sectional view of an exemplary vessel equipped with a liquefied natural gas storage tank according to an embodiment of the present invention.

4, the liquefied natural gas storage tank according to the present invention may be installed in the ship 400, and the ship 400 may include an outer wall 410 forming an outer shape, And has a double structure of an inner wall 420 formed therein. The inner wall 420 and the outer wall 410 of the ship 400 are connected to each other by the connection rib 430 and may be integrally formed with the inner wall 420. In some cases, have. On the other hand, only the upper part of the ship 400 can be formed as a single deck, and its shape can be variously changed according to the size of the ship 400 or the storage capacity.

The inside of the inner wall 420 may be divided by at least one partition wall 440, and the partition 440 may form a copper dam.

Here, the sealing wall 480 may be formed so that the liquefied natural gas (LNG) stored in the storage tank is liquid-tight and in contact with the liquefied natural gas (LNG), and the corrugated portion is formed to correspond to the temperature change according to the line load of the cryogenic LNG. The sealing wall 480 is connected to the inner wall 420 or the partition wall 440 of the vessel 400 by a plurality of anchor structures 450. Therefore, the sealing wall 480 is not movable relative to the hull.

In addition, between the sealing wall 480 and the inner wall 420, the heat insulating wall structures 460, 450 and 470, which are modules constituting a layer of the heat insulating wall, are positioned. The heat insulating wall structures 460, 450 and 470 are located between the inner walls 420 or between the inner walls 440 and the sealing wall 480 to form a heat insulating wall for inspecting the storage tank 10.

The heat insulating wall structures 460, 450, and 470 are each formed of a module and include a corner structure 460 positioned at a corner portion, an anchor structure 450 having inner walls of the hull at regular intervals, a corner structure 460, And a planar structure 470 provided on a plane between the anchor structures 450.

As described above, in the present invention, the sealing wall 480 is mainly supported by the anchor structure 450 and the planar structure 470 supports only the load of the LNG received by the sealing wall 480 and has a direct coupling relation with the sealing wall 480 none.

The anchor structure 450 is installed on the inner wall 420 or the partition wall 440 of the storage tank and is fixed by an anchor member passing through the anchor structure 450.

The planar structure 470 is inserted between the anchor structure 450 or the corner structure 460 and is installed in the inner wall 420 of the tank by a plurality of connecting means. That is, the planar structure 470 is installed by fastening a flat bottom plate of the planar structure 470 with a nut to a stud bolt welded to the inner wall 420 of the hull. The planar structure 470 may be formed with a gap (1 to 4 mm) spaced apart from the side surface of the corner structure 460 or the anchor structure 450 by a predetermined distance, So that the deformation amount can be absorbed. Accordingly, the planar structure 470 can be slightly moved (slid) in the horizontal direction with respect to the bottom surface.

6, the planar structure 470 includes a planar bottom plate 471 that is in contact with the inner wall 420, a planar thermal insulation material 472 formed on the top of the planar bottom plate 471, And a flat upper plate 473 formed on the upper surface of the base plate.

Here, the flat bottom plate 471 and the flat top plate 473 are made of a plywood material, and the flat heat insulating material 472 is formed of a polyurethane foam.

A sealing wall 480 directly contacting the liquefied natural gas is provided on the upper part of the heat insulating wall structures 450 and 470. The sealing wall 480 is composed of a primary sealing wall 481 in direct contact with the LNG and a secondary sealing wall 482 under the primary sealing wall 481. The primary sealing wall 481, And the secondary sealing walls 482 are spaced apart from each other by a predetermined height. In this case, the primary sealing wall 481 and the secondary sealing wall 482 may be damaged by contact, so that the primary sealing wall 481 and the secondary sealing wall 482 may be damaged by the primary sealing A support plate may be provided to maintain a constant distance between the wall 481 and the secondary sealing wall 482.

The sealing wall 480 is formed with a plurality of corrugated portions for preventing shrinkage and damage during stretching. The corrugated portion is prevented from being damaged due to thermal deformation applied to the sealing wall 480 due to elongation or contraction due to the temperature change of the LNG under the line load. Further, the sealing wall 480 is fixed to the anchor member of the anchor structure 450 by welding.

6, the sealing wall 480 is formed as a double structure consisting of the primary sealing wall 481 and the secondary sealing wall 482, but it is also possible to stack three or more multi-layer structures.

Next, an anchor structure and an anchor member according to an embodiment of the present invention will be described with reference to Figs. 5 to 9. Fig. FIG. 5 is a plan view of the vicinity of an anchor structure and an anchor structure according to an embodiment of the present invention, FIG. 6 is a sectional view taken along line A-A 'in FIG. 5, and FIG. 7 is a sectional view taken along line B- FIG. 8 is a cross-sectional view of an anchor member according to an embodiment of the present invention, and FIG. 9 is a view illustrating a process of assembling an anchor member according to an embodiment of the present invention.

6, an anchor structure 450 according to an embodiment of the present invention includes an anchor member 610, a first anchor top plate 620, a second anchor top plate 630, a heat insulating material 640, A first anchor bottom plate 650, an anchor support bolt cap 660, a second anchor bottom plate 670, and an anchor member fixing nut 680.

The anchor member 610 is a member for fixing the sealing wall by connecting the inner wall of the liquefied natural gas storage tank with the sealing wall. The anchor member 610 according to the embodiment of the present invention includes a nitrogen supply nozzle for supplying nitrogen between the primary sealing wall and the secondary sealing wall. Supply nitrogen gas between the primary sealing wall and the secondary sealing wall to determine whether the primary sealing wall is leaking. At this time, nitrogen gas may be filled between the primary sealing wall and the secondary sealing wall, or nitrogen gas may be circulated. Then, nitrogen gas is sampled to determine whether methane is detected in the nitrogen gas, and it is determined whether or not the primary sealing wall is leaking.

In addition, the anchor member 610 according to the embodiment of the present invention is configured such that the joining portion in contact with the sealing wall can slide in the horizontal direction. Therefore, as the joining portion slides in the horizontal direction when the ship is shaken, it can actively cope with deformation of the hull.

8, the anchor member 610 includes a first joint 611, a second joint 612, an anchor support cap 613, an anchor support plate 614, a nitrogen supply nozzle 616, And a support rod 615.

The first bonding portion 711 is a portion to which the secondary sealing wall 482 is bonded and is composed of a cap portion to which the secondary sealing wall 482 is bonded and a flange portion radially extending from the lower end of the cap portion. The first joint portion 611 is placed on the anchor support plate 614 so that the flange portion of the first joint portion 611 contacts the anchor support plate 614 while the first joint portion 611 is fixed to the anchor support plate 614 . The anchor support cap 613 is placed on the first joint 611 and the edge of the anchor support cap 613 is fixed to the anchor support plate 614 by welding. The anchor support cap 613 is composed of a cap portion and a flange portion radially extending from the lower end of the cap portion, and the edge of the flange portion of the anchor support cap 613 is welded to the anchor support plate 614, and the flange portion of the anchor support cap 613 covers the flange portion of the first joint portion 611. Therefore, the first joint portion 611 can slide in the horizontal direction inside the anchor support cap 613. [ That is, as the first joining portion 611 slides in the horizontal direction when the ship is shaken, it can actively cope with deformation of the hull.

The second bonding portion 612 is located at the upper portion of the first bonding portion 611 as a portion to which the primary sealing wall 481 is bonded. The second joint 612 may be fixed to the upper portion of the first joint 611 by welding. In the process of manufacturing the liquefied natural gas storage tank, after the anchor structure 450 is formed in a state where the second joint portion 612 is not attached to the anchor member 610, the anchor structure 450 is disposed in the liquefied natural gas storage tank The secondary sealing wall 482 is fixed to the first bonding portion 711 by welding and then the second bonding portion 612 is fixed to the upper portion of the first bonding portion 611 by welding, The primary sealing wall 481 can be fixed to the second joint portion 612 by welding.

The nitrogen supply nozzle 616 supplies nitrogen between the primary sealing wall 481 and the secondary sealing wall 482.
6 and 8, the secondary sealing wall 482 is bonded to the upper portion of the first bonding portion 611 and the primary sealing wall 481 is bonded to the upper portion of the second bonding portion 612. [ The side periphery of the second bonding portion 612 located at the upper portion of the first bonding portion 611 is positioned between the primary sealing wall 481 and the secondary sealing wall 482. [ The nitrogen supply nozzle 616 extends to a space surrounded by the first bonding portion 611 and the second bonding portion 612. A hole is formed in the outer periphery of the side surface of the second bonding portion 612 located between the primary sealing wall 481 and the secondary sealing wall 482.
9, the nitrogen supply nozzle 616 includes a T-shaped pipe 910, a straight pipe 920, a corrugated pipe 940 and a corrugated pipe cover 950.

9, the straight pipe 920 and the anchor support rod 615 are welded to the T-shaped pipe 910 and the corrugated pipe cover base 930 is fitted to the T-shaped pipe 910. [ Then, a corrugated pipe 940 is attached to the T-shaped pipe 910 by welding. When the LNG is filled in the LNG storage tank near the LNG, the LNG shrinks due to the low temperature of the LNG, and the temperature rises when the LNG is emptied. Therefore, a portion close to the LNG is treated with the corrugated pipe 940 so as to be able to shrink and expand.

Then, the corrugated pipe 940 is covered with the corrugated pipe cover 950. At this time, the corrugated pipe cover 950 and the corrugated pipe cover pedestal 930 are welded. Then, after the anchor supporting plate 614 is inserted into the bell-tube cover 950, the anchor supporting plate 614 and the bell-tube cover 950 are welded. Since the corrugated pipe 940 is inconvenient to weld to the anchor supporting plate 614, the corrugated pipe 940 is covered with the corrugated pipe cover 950 and then the corrugated pipe 940 is welded to the corrugated pipe 940 (Not shown).

Referring to Figs. 6 and 7, a flexible hose is connected to the nitrogen supply nozzle 616, and nitrogen is supplied through the flexible hose.

Referring to FIG. 6, the upper portion of the nitrogen supply nozzle 616 is filled with a grass wool. That is, when the heat insulating material 640 is formed, the upper portion of the nitrogen supply nozzle 616 forms a groove, and the nitrogen supply nozzle 616 is inserted into the heat insulating material 640. Then, Fill it.

The anchor support rod 615 penetrates through the anchor structure 450 and is formed with a thread groove at the lower portion thereof so as to be engaged with the anchor member fixing nut 680 so that the anchor member 610 can be coupled to other components of the anchor structure 450 .

The heat insulating material 640 is integrally formed around the anchor member 610 by a polyurethane foam or a reinforced polyurethane foam or the like. A first anchor upper plate 620 and a second anchor upper plate 630 are attached to the upper end of the heat insulating material 640 and a first anchor lower plate 650 and a second anchor lower plate 630 are attached to the lower end of the heat insulating material 640 670 are attached. The first anchor top plate 620, the second anchor top plate 630, the first anchor bottom plate 650, and the second anchor bottom plate 670 may be plywood.

The anchor support bolt cap 660 is comprised of a second flange portion positioned between the first anchor bottom plate 650 and the second anchor bottom plate 670 and extending radially from the lower end of the second cap portion and the second cap portion. The second cap portion is formed with a through hole so that the anchor support rod 615 can pass through. The anchor support bolt cap 660 can be inserted between the first anchor bottom plate 650 and the second anchor bottom plate 670 to function as a metal reinforcement plate. The anchor support bolt cap 660 may be circular or rectangular in shape.

The anchor support rod 615 also penetrates through the first anchor upper plate 620, the second anchor upper plate 630, the heat insulating material 640, the first anchor bottom plate 650 and the second anchor bottom plate 670 Through holes are formed. Therefore, the anchor support rod 615 of the anchor member 610 is fixed to the first anchor upper plate 620, the second anchor upper plate 630, the heat insulating material 640, the first anchor bottom plate 650, The anchor member 610 and the second anchor lower plate 670 are inserted into the anchor member 660 and the second anchor lower plate 670 and then the screw groove of the lower portion of the anchor support rod 615 is engaged with the anchor member fixing nut 680, Elements.

10 is an enlarged view of a portion C in Fig. 10 is a view showing a portion where the anchor support rod 615 and the anchor member fixing nut 680 are coupled. 10, an anchor supporting bolt cap 660 is formed in a cap shape to be engaged with the anchor support rod 615, and the first anchor lower plate 650 and the second anchor lower plate 670 The hole is formed to be larger than the cross-sectional area of the anchor support rod 615, so that the anchor support rod 615 can move up and down. That is, the portion where the anchor support bolt cap 660 is engaged with the anchor support rod 615 is not tightened but in the shape of a cap, and the first anchor lower plate 650 and the second anchor lower plate 670 are spaced apart from the anchor support rod So that the lower portion of the anchor support rod can move up and down. When the liquefied natural gas storage tank is filled with a large amount of liquefied natural gas, pressure is applied to the anchor structure 450 due to the load of the liquefied natural gas, and the heat insulating material 640 of the polyurethane foam material shrinks. The support rod 615 does not contract. Therefore, in the embodiment of the present invention, the anchor support rod 615 can be moved up and down, thereby relieving the stress concentration of the adiabatic system that receives the load of the LNG.

Next, a method of manufacturing a liquefied natural gas storage tank according to an embodiment of the present invention will be described with reference to FIG. 11 is a flowchart illustrating a method of manufacturing a liquefied natural gas storage tank according to an embodiment of the present invention.

11, an insulation wall including an anchor structure 450 is installed on the inner wall 420 and the partition wall 440 of the liquefied natural gas storage tank (S1110). In step S1010, the anchor structure 450, the corner structure 460, and the planar structure 470 are fixed to the inner wall 420 and the partition wall 440 of the liquefied natural gas storage tank. At this time, stud bolts previously installed in the inner wall 420 of the liquefied natural gas storage tank and the partition wall 440 are inserted into the through holes of the anchor structure 450, the corner structure 460 and the planar structure 470 It can be fixed with a nut.

Then, the secondary sealing wall is fixed to the first bonding portion 611 of the anchor structure 450, and the secondary sealing wall is provided on the upper surface of the heat insulating wall (S1120). Then, the second joint portion 612 is fixed to the upper portion of the first joint portion 611 by welding (S1130), and the primary seal wall is fixed to the second joint portion 612 to install the primary seal wall (S1140 ).

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

420: inner wall
410: outer wall
430: connecting rib
440:
480: sealing wall
481: primary sealing wall
482: Secondary sealing wall
450: anchor structure
460: corner structure
470: planar structure
610: Anchor member
620: first anchor top plate
630: Second anchor top plate
640: Insulation
650: first anchor bottom plate
660: Anchor support bolt cap
670: second anchor bottom plate
680: Anchor member holding nut
611: first connection
612: second joint
613: Anchor support cap
614: Anchor support plate
615: Anchor support rod
616: Nitrogen supply nozzle

Claims

An anchor structure for connecting an inner wall of a liquefied natural gas storage tank with a primary sealing wall and a secondary sealing wall,
An anchor member including a nitrogen supply nozzle for supplying nitrogen between the primary sealing wall and the secondary sealing wall; And
And a heat insulating material formed around the anchor member,
Wherein the primary sealing wall is in direct contact with the liquefied natural gas and the secondary sealing wall is located under the primary sealing wall, the primary sealing wall and the secondary sealing wall are joined to the anchor member,
Wherein the anchor member includes a first bonding portion to which the secondary sealing wall is bonded and a second bonding portion that is located on the upper portion of the first bonding portion and to which the primary sealing wall is bonded,
Wherein the secondary sealing wall is bonded to the upper portion of the first bonding portion and the primary sealing wall is bonded to the upper portion of the second bonding portion and the side periphery of the second bonding portion located on the upper portion of the first bonding portion is bonded to the upper portion of the first bonding portion, A second sealing wall disposed between the car sealing wall and the secondary sealing wall,
Wherein the nitrogen supply nozzle extends to a space surrounded by the first joint and the second joint,
And an opening is formed on a side surface of the second joint portion.

The method according to claim 1,
Wherein the nitrogen supply nozzle comprises a corrugation pipe.

The method of claim 2,
Wherein the anchor member further comprises an anchor support plate positioned on the upper portion of the heat insulating material,
Wherein the first joint is located on an upper portion of the anchor support plate.

The method of claim 3,
Wherein the nitrogen supply nozzle further comprises a bell tube cover surrounding the bell tube, and the bell tube cover is welded to the anchor support plate.

The method of claim 3,
And the second joint is configured to be able to slide in a horizontal direction.

The method of claim 5,
Wherein the first joint portion comprises a first cap portion to which the secondary sealing wall is joined and a first flange portion radially extending from a lower end of the first cap portion, the first flange portion contacting the anchor support plate, Wherein the anchor structure is not secured to the support plate.

The method of claim 6,
Wherein the anchor member further comprises an anchor support cap composed of a second cap portion and a second flange portion radially extending from a lower end of the second cap portion,
Wherein the second flange portion covers the first flange portion and the edge of the second flange portion is fixed to the anchor support plate by welding.

The method according to claim 1,
Wherein an upper portion of the nitrogen supply nozzle is filled with a grass wool.

The method according to claim 1,
Wherein a supporting plate for maintaining a constant distance between the primary sealing wall and the secondary sealing wall is provided.

A storage tank for storing liquefied natural gas,
An insulating wall provided on an inner wall of the storage tank to form a heat insulating layer;
A primary sealing wall contacting the liquefied natural gas and contacting the liquefied natural gas;
A secondary sealing wall located below the primary sealing wall and sealing the liquefied natural gas when the primary sealing wall leaks; And
An anchor structure connecting the inner wall of the storage tank with the primary sealing wall and the secondary sealing wall;
/ RTI >
Wherein the anchor structure includes an anchor member including a nitrogen supply nozzle for supplying nitrogen between the primary sealing wall and the secondary sealing wall,
Wherein the anchor member includes a first bonding portion to which the secondary sealing wall is bonded and a second bonding portion that is located on the upper portion of the first bonding portion and to which the primary sealing wall is bonded,
Wherein the secondary sealing wall is bonded to the upper portion of the first bonding portion and the primary sealing wall is bonded to the upper portion of the second bonding portion and the side periphery of the second bonding portion located on the upper portion of the first bonding portion is bonded to the upper portion of the first bonding portion, A second sealing wall disposed between the car sealing wall and the secondary sealing wall,
Wherein the nitrogen supply nozzle extends to a space surrounded by the first joint and the second joint,
And a hole is formed on a side surface of the second joint portion.

The method of claim 10,
Wherein the nitrogen supply nozzle comprises a corrugated tube.

The method of claim 11,
Wherein the anchor structure further comprises a heat insulating material formed around the anchor member,
Wherein the anchor member further includes an anchor support plate positioned on the upper portion of the heat insulating material,
Wherein the first joint is located on top of the anchor support plate.

The method of claim 12,
Wherein the nitrogen supply nozzle further comprises a bell tube cover surrounding the bell tube, and the bell tube cover is welded to the anchor support plate.

The method of claim 12,
And the second joint is configured to be able to slide in a horizontal direction.

15. The method of claim 14,
Wherein the first joint portion comprises a first cap portion to which the secondary sealing wall is joined and a first flange portion radially extending from a lower end of the first cap portion, the first flange portion contacting the anchor support plate, A storage tank for storing liquefied natural gas that is not secured to a support plate.

16. The method of claim 15,
Wherein the anchor member further comprises an anchor support cap composed of a second cap portion and a second flange portion radially extending from a lower end of the second cap portion,
Wherein the second flange portion covers the first flange portion and the edge of the second flange portion is fixed to the anchor support plate by welding.

The method of claim 10,
Wherein the upper portion of the nitrogen supply nozzle is filled with a grass wool.

The method of claim 10,
Wherein a supporting plate for maintaining a constant distance between the primary sealing wall and the secondary sealing wall is provided.

A method of manufacturing a liquefied natural gas storage tank,
Providing an insulated wall including an anchor structure on an inner wall of the storage tank;
Fixing the secondary sealing wall to the first joint portion of the anchor structure and installing the secondary sealing wall on the upper surface of the heat insulating wall;
Securing a second abutment on top of the first abutment;
Securing the primary sealing wall to the second joint and installing the primary sealing wall;
Lt; / RTI >
Wherein the anchor structure includes an anchor member including a nitrogen supply nozzle for supplying nitrogen between the primary sealing wall and the secondary sealing wall,
Wherein the anchor member includes a first bonding portion to which the secondary sealing wall is bonded and a second bonding portion that is located on the upper portion of the first bonding portion and to which the primary sealing wall is bonded,
The secondary sealing wall is bonded to the upper portion of the first bonding portion and the primary sealing wall is bonded to the upper portion of the second bonding portion and the side periphery of the second bonding portion located on the upper portion of the first bonding portion is bonded to the upper portion of the first bonding portion, A second sealing wall disposed between the car sealing wall and the secondary sealing wall,
Wherein the nitrogen supply nozzle extends to a space surrounded by the first joint and the second joint,
Wherein a hole is formed on a side of the side of the second joint.

The method of claim 19,
Wherein the nitrogen supply nozzle comprises a corrugated tube.

The method of claim 20,
Wherein the anchor structure further comprises a heat insulating material formed around the anchor member,
Wherein the anchor member further comprises an anchor support plate positioned on the upper portion of the heat insulating material,
Wherein the first abutment is located on top of the anchor support plate.

23. The method of claim 21,
Wherein the nitrogen supply nozzle further comprises a bell tube cover surrounding the bell tube, wherein the bell tube cover is welded to the anchor support plate.

23. The method of claim 21,
And the second joint is configured to be able to slide in a horizontal direction.

24. The method of claim 23,
Wherein the first joint portion comprises a first cap portion to which the secondary sealing wall is joined and a first flange portion radially extending from a lower end of the first cap portion, the first flange portion contacting the anchor support plate, And is not secured to the support plate.

27. The method of claim 24,
Wherein the anchor member further comprises an anchor support cap composed of a second cap portion and a second flange portion radially extending from a lower end of the second cap portion,
Wherein the second flange portion covers the first flange portion and the edge of the second flange portion is fixed to the anchor support plate by welding.