KR20120135475A - Insulation structure for cargo hold of lng carrier - Google Patents

Abstract

PURPOSE: An insulation structure for a LNG(liquefied natural gas) storage tank is provided to prevent damage of an auxiliary secondary barrier by forming an inclined part on the top of the edge of a flat plate when the auxiliary secondary barrier is installed to be recessed downward. CONSTITUTION: An insulation structure for a LNG storage tank comprises a lower insulation structure(100) and an upper insulation structure(200). The upper insulation structure is laminated on the lower insulation structure. The lower insulation structure comprises a lower insulation board(110), a flat plate, a secondary barrier(140), and an auxiliary secondary barrier(150). The lower insulation board is fixed in an inner side of a storage tank. The flat plate is laminated and fixed on the lower insulation board. The secondary barrier is laminated and fixed on the flat plate. Both ends of the auxiliary secondary barrier are placed and fixed on the lower insulation board to connect the lower insulation board.

Description

Insulation structure for cargo hold of LNG carrier

The present invention relates to a heat insulating structure for a liquefied natural gas storage tank, and relates to a heat insulating structure for a liquefied natural gas storage tank that can secure the fixing force of the lower insulation board and the secondary barrier.

In general, natural gas is transported in a gaseous state through onshore or offshore gas pipelines, but is also transported in LNG carriers in the form of LNG. LNG is obtained by cooling natural gas to a cryogenic temperature of -163 ° C, the volume of which is reduced to about 1/600 of its volume in the gaseous state, and is therefore well suited for long distance transport by sea.

In order to transport LNG by using LNG carriers, LNG carriers are usually provided with a LNG storage tank capable of withstanding the cryogenic temperature of LNG. An interior of the storage tank is provided with an insulating structure.

The conventional heat insulating structure for the LNG storage tank is composed of a lower insulation board, an upper insulation board, a primary barrier attached to the upper insulation board, a secondary barrier attached to the lower insulation board.

Here, the lower insulation board of the conventional heat insulation structure is made of polyurethane foam (PUF), the secondary barrier is made of triplex, and the secondary barrier is bonded to the lower insulation board using an adhesive.

However, since the secondary barrier was simply adhered to the lower insulation board by using an adhesive, there was a disadvantage in that airtightness and safety of the secondary barrier could be deteriorated due to poor adhesion and lack of adhesion.

Secondary barriers were made of triplex and could not be welded. Secondary barriers should be made of stainless steel for welding. However, if the secondary barrier is made of stainless steel, it was difficult to attach to the lower insulation board. .

Embodiments of the present invention are to provide a heat insulating structure for the LNG storage tank that can secure the tightness and secure the tightness of the lower insulation board and the secondary barrier.

In addition, embodiments of the present invention is to provide a heat insulating structure for a liquefied natural gas storage tank that can be welded to the secondary barrier.

In addition, embodiments of the present invention to provide a thermal insulation structure for a liquefied natural gas storage tank to reduce the thermal stress caused by the thermal deformation of the secondary barrier and the secondary secondary barrier.

According to an aspect of the present invention, there is provided a plurality inside the liquefied natural gas storage tank to insulate the interior of the storage tank, the insulating structure comprising a lower insulating structure and an upper insulating structure laminated on the lower insulating structure, the The lower insulation structure includes a lower insulation board fixed to an inner surface of the storage tank, a flat plate laminated on the lower insulation board, a secondary barrier laminated and fixed on the flat plate, and a lower thermal insulation board adjacent to each other. Both side ends may be seated and fixed, respectively, and a heat insulating structure for a LNG storage tank including an auxiliary secondary barrier connecting the lower insulation board may be provided.

Here, the lower insulation structure may further include a joining plate which is interposed between the plate and the secondary barrier at a predetermined distance from the four edges of the plate inwardly spaced apart and fixed to the plate and the secondary barrier. have.

In addition, the plate may include a seating portion formed to be recessed so that the coupling plate can be inserted.

In addition, the secondary barrier may be welded to the joining member, and the auxiliary secondary barrier may be welded to the secondary barrier.

In addition, the secondary barrier is bonded to the plate with an adhesive, the plate may further include a first groove formed recessed along the inside of the mounting portion to accommodate the adhesive flowing toward the joining plate.

In addition, the plate may further include a plurality of second grooves formed in the inner portion of the first groove.

In addition, the inclined portion of a predetermined angle may be formed on the upper edge of the mutually opposite edges of the flat plates laminated on the lower insulating board adjacent to each other.

On the other hand, the lower insulation structure may be further mounted to the edge of the flat plate and the lower insulation board may further include a fixed support for fixing the lower insulation board to the storage tank.

Here, the fixing support is a fixing member which is open upward and has an empty cylindrical shape, the upper end of which is fixed to the flat plate, and the lower end of the fixing support is fixed to the lower insulating board and the bottom of the fixing member. It may include a bolt member that is fixed to the bottom surface and the inner surface of the storage tank through the lower insulation board.

Embodiments of the present invention can suppress thermal contraction and expansion of the secondary barrier by the plywood interposed between the secondary barrier and the lower insulation board.

In addition, embodiments of the present invention can be firmly fixed to the secondary barrier because the welding member is possible when the coupling member for fixing the flat plate and the secondary barrier layer stacked thereon is made of a metal material.

In addition, embodiments of the present invention can prevent damage to the secondary secondary barrier by forming an inclined portion at the upper edge of the plate when the secondary secondary barrier is recessed downward.

In addition, embodiments of the present invention includes a fixing support for fixing the lower insulation board to the inner surface of the storage tank in addition to the adhesive such as a mastic provided on the bottom surface of the lower insulation board to heat shrinkage of the secondary barrier and the secondary secondary barrier Due to this, the end of the lower insulation board can be prevented from being lifted up.

1 is a perspective view showing an insulating structure for a liquefied natural gas storage tank according to an embodiment of the present invention.
Figure 2 is a schematic exploded perspective view showing a lower insulating structure of the insulating structure shown in FIG.
3 is an exploded cross-sectional view of a lower insulating structure of the insulating structure shown in FIG.
Figure 4 is a cross-sectional view of the main portion showing a state in which the lower insulation structure of the thermal insulation structure shown in Figure 1 is installed in the storage tank.
5 is a view showing another embodiment of a lower insulating structure of the insulating structure shown in FIG.
Figure 6 is a sectional view showing the main part of the insulating structure for the LNG storage tank according to another embodiment of the present invention.
Figure 7 is a main cross-sectional view showing an insulating structure for a liquefied natural gas storage tank according to another embodiment of the present invention.

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

Insulating structure for the liquefied natural gas storage tank according to an embodiment of the present invention is to insulate the interior of the storage tank is provided with a plurality inside the liquefied natural gas storage tank, as shown in Figure 1 insulation for liquefied natural gas storage tank The structure includes a lower insulation structure 100 and an upper insulation structure 200.

The upper insulation structure 200 is stacked on the lower insulation structure 100, and although not specifically illustrated, includes an upper insulation board and a primary barrier attached to the upper insulation board. The primary barrier usually consists of a membrane and has a number of corrugations to allow for shrinkage and expansion due to thermal deformation. The primary barrier may be made of stainless steel, and in contact with the liquefied natural gas to support liquid tightness, the load such as hydraulic pressure is transferred to the inner surface of the storage tank through the upper insulation board and the lower insulation structure 100. do. Other structural features related to the upper insulation structure may be used that is conventionally used in the technical field to which the present invention belongs, a detailed description thereof will be omitted.

As shown in FIGS. 2 to 5, the lower insulation structure 100 includes a lower insulation board 110, a flat plate 120, a secondary barrier 140, and an auxiliary secondary barrier 150. The plate 130 may further include.

The lower insulation board 110 is fixed to the inner side of the storage tank. In this case, as illustrated in FIG. 4, an adhesive such as a mastic (mastic) applied to form a plurality of rows on the bottom surface of the lower insulation board 110. 10) can be fixed to the inner surface of the storage tank (not shown). A protective plate (not shown) may be provided between the inner surface of the storage tank and the lower insulation board 110 as necessary. In this case, the protective plate may be fixed to the inner surface of the storage tank by using a bolt or the like. And the lower insulation board 110 is made of polyurethane foam, when the protective plate is provided, the lower insulation board 110 may be attached by an adhesive on the protective plate. The lower insulation board 110 is attached to maintain a constant gap with each other, as shown in FIGS. 1 and 4, and although not specifically shown, the gap between the lower insulation boards 110 is a glass wool material. Flat Joint is inserted.

The flat plate 120 is provided between the lower insulation board 110 and the secondary barrier 140 to serve to suppress heat shrinkage and expansion of the secondary barrier 140, and thus, on the conventional lower insulation board. Deformation of the secondary barrier can be reduced compared to the secondary barrier is stacked. The flat plate 140 is laminated and fixed on the lower insulation board 110 and may be made of plywood. In this case, the flat plate 120 may be adhesively fixed to the upper surface of the lower insulating board (110). In addition, the secondary barrier 140 may be adhesively fixed to the upper surface of the flat plate 120.

On the other hand, the flat plate 120 also serves to fix the joining plate member 130 provided for the welding joint of the secondary barrier 140, a detailed description thereof will be described later.

2 to 4, the plate 120 may include a seating portion 124. Here, the seating portion 124 of the plate 120 may be formed in a recessed position spaced apart from the four edges of the upper surface of the plate 120 by a predetermined interval, coupled to the seating portion 124 of the plate 120 Dragon plate 130 may be inserted. The reason why the mounting portion 124 of the flat plate 120 is recessed is when the coupling plate 130 is inserted into and fixed to the seating portion 124 of the flat plate 120 as shown in FIGS. 4 and 5. The upper surface of the 120 and the upper surface of the coupling plate 130 to achieve the same horizontal plane, so that the secondary barrier 140 is laminated on the flat plate 120 and the coupling plate 130 is horizontal State is maintained.

The coupling plate 130 is interposed between the flat plate 120 and the secondary barrier 140, and specifically, the flat plate 120 is interposed at a predetermined distance from the four edges of the flat plate 120 inwardly. It may be fixed with the vehicle barrier 140. Joining plate 130 is formed to form the shape of one closed curve, or as shown in Figure 2 may be arranged a plurality of strips modularized to a certain size, such as the shape or arrangement is a technique One of ordinary skill in the art may arbitrarily and variously apply as needed.

The joining plate 130 and the secondary barrier 140 may be made of a metal material (eg, stainless steel) for welding. In this case, as shown in FIGS. 3 and 4, the rivet 132 may be used to fix the metal plate 130 for bonding to the flat plate 120, and the rivet 132 may be a flat plate 120. And it may be fixed to the lower insulation board (110).

As described above, when the mounting portion 124 is recessed in the flat plate 120, the coupling plate 130 is inserted into the mounting portion 124 of the flat plate 120 and fixed as shown in FIG. 4. The upper surface of the flat plate 120 and the upper surface of the joining plate 130 form the same horizontal plane, and the secondary barrier 140 is laminated on the flat plate 120 and the joining plate 130 to maintain a horizontal state. do.

The secondary barrier 140 is laminated and fixed on the flat plate 120, and as shown in FIGS. 3 and 4, when the joining plate 140 is provided on the seating portion 124 of the flat plate 120, the flat plate ( 120 and laminated on the bonding plate 130. The secondary barrier 140 acts as a buffer between the lower insulation board 110 and the upper insulation board 210 stacked thereon, and when the primary barrier is broken, the cryogenic liquid is in direct contact with the inner wall of the storage tank. It is to prevent the role. The secondary barrier 140 may be adhesively fixed to the flat plate 120 with an adhesive.

The secondary barrier 140 may be formed of a thin metal plate. In this case, welding is possible for firm fixing of the secondary barrier 140, and for this purpose, the joining plate 130 may be made of a metal material. Before welding the second barrier 140 to the joining plate 130, the second barrier 140 may be adhered to the flat plate 120 with an adhesive, and the edge of the second barrier 140 and the joining plate ( By welding the upper surface of 130, the secondary barrier 140 can be firmly fixed. For convenience of welding, as shown in FIGS. 3 and 4, the secondary barrier 140 may be formed in a size smaller than the plate 120 such that the edge thereof is positioned above the seating portion 124 of the plate 120. have. The welding method is not particularly limited and may be selected by a person of ordinary skill in the art according to the need.

As such, the secondary barrier 140 may be adhered to the upper surface of the flat plate 120 by an adhesive and welded to the bonding plate 130 at the same time. Since the joining plate 130 is fixed to the flat plate 120 and the lower insulation board 110 by rivets, and the secondary barrier 140 is welded to the joining plate 130, as a result, the secondary barrier ( 140 may be firmly fixed to the lower insulation board 110, and problems such as lack of adhesion due to the attachment of a conventional secondary barrier with an adhesive to the lower insulation board may be solved.

On the other hand, in the case of adhering the secondary barrier 140 after applying the adhesive on the upper surface of the plate 120, in the process of adhering the secondary barrier 140 on the plate 120, the upper surface of the plate 120 The adhesive may be pushed outward to contact the welding portion of the secondary barrier 140 and the joining plate 130, in order to prevent the flat plate 120 is mounted on the upper surface to prevent this It may have a first groove 126 recessed along the inner side of the (124). Therefore, when the secondary barrier 140 is bonded to the flat plate 120, the adhesive component pushed outward is filled in the first groove 126 of the flat plate 120, so that the secondary barrier 140 and the plate for bonding ( It does not extend to the welded portion (not shown) of 130).

In addition, a plurality of second grooves may be formed on the upper surface of the flat plate 120, and as shown in FIG. 5, the second grooves 123 may be formed in a lattice shape. The reason why the second groove 123 is formed on the flat plate 120 is to prevent the secondary barriers 140 adhered on the flat plate 120 from being thermally deformed with each other so that stress occurs at the bonding site when heat shrinkage occurs. to be.

As shown in FIGS. 1, 3, and 4, the secondary secondary barrier 150 is mounted on both side ends of the lower insulation boards 110 adjacent to each other, thereby connecting the lower insulation boards 110. It is to play a role. That is, the auxiliary secondary barrier 150 is attached to the upper surface of the secondary barrier 140 on the adjacent lower insulation board 110 so as to overlap the lower insulation board 110, and also the lower insulation board 110. And seal between the upper insulation board (210). The secondary secondary barrier 150 may be made of a metal material, for example, stainless steel, and may be welded to the secondary barrier 140 made of a thin metal plate.

This secondary secondary barrier may be formed in the shape of a flat plate, or may have corrugation. As shown in Figure 4, the corrugation (not shown) of the secondary secondary barrier 150 may be formed convex upwards, in which case the corrugation of the secondary secondary barrier 150 is adjacent to It is located above the gap of the lower insulation board (110).

The corrugation of the secondary secondary barrier 150 serves to reduce thermal stress due to thermal deformation of the secondary secondary barrier 150. That is, when the auxiliary secondary barrier 150 is bonded, the lower insulation board 110 is thermally expanded in the high temperature curing process and then shrinks as it is, and applies thermal stress to the secondary secondary barrier 150 in the process of returning to room temperature. In addition, corrugation reduces the thermal stress caused by such thermal deformation. In addition, even when the lower insulation board 110 is cooled and contracted by the cryogenic liquid, thermal stress due to thermal deformation may be reduced due to the corrugation of the secondary secondary barrier 150. Furthermore, when the secondary secondary barrier 150 and the secondary barrier 140 are joined by welding, a phenomenon in which the welded portion is broken due to shrinkage and expansion due to heat may occur, and this phenomenon may also occur in the secondary secondary barrier. This can be prevented by forming a corrugation at 150.

On the other hand, in another embodiment of the secondary secondary barrier may be applied to the secondary secondary barrier 150 of the shape in which the center portion is concave downward. As shown in FIG. 6, the corrugation of the downwardly concave auxiliary secondary barrier 150 is inserted into the gap between the adjacent lower insulating boards 110. In this case, each of the flat plates 120 stacked on the adjacent lower insulating boards 110 may have an inclined portion 128 that is formed to be inclined at a predetermined angle on the upper ends of the opposite edges. Since the corrugation of the secondary secondary barrier 150 is concave downward, when the upper edge of the plate 120 is angled, the secondary secondary barrier 150 may be damaged and the plate 120 may be prevented. ) The top of the edge is formed to be inclined. 6 shows that the inclined portion 128 of the flat plate 120 is straight, the inclined portion of the flat plate 120 may be round. Insulating structure for a liquefied natural gas storage tank according to another embodiment of the present invention shown in Figure 6 is that the secondary secondary barrier 150 is formed in a downward concave shape, the inclined portion 128 in the flat plate 120 Other technical features except that it is formed is substantially the same as the heat insulating structure for the liquefied natural gas storage tank according to an embodiment of the present invention described above.

Looking at the installation process of the insulating structure for the liquefied natural gas storage tank according to an embodiment of the present invention as described above as follows.

First, in order to install the lower insulation structure 100, an adhesive is applied to the bottom of the lower insulation board 110 formed of polyurethane foam and adhered to the inner surface of the storage tank, and then the adhesive on the upper surface of the lower insulation board 110. Is applied and the flat plate 120 is bonded. Then, after mounting a plurality of coupling plate 130 on the mounting portion 124 of the flat plate 120 using the rivet 132, the coupling plate 130, the flat plate 120 and the lower insulation board 110. ). Then, an adhesive is applied to the upper surface of the flat plate 120 and the secondary barrier 140 is bonded to each other, and the edge of the secondary barrier 140 and the upper surface of the joining plate 130 are welded together. Then, both sides of the secondary secondary barrier 150 is seated on the secondary barrier 140 attached on the lower insulation board 110 adjacent to each other, and the secondary secondary barrier 150 and the secondary barrier 140. Weld-bonded, thereby completing the fabrication of the lower insulation structure (100). Thereafter, the upper insulation structure 200 is laminated and fixed on the lower insulation structure 100. The upper insulation structure 200 is a conventional one is used, the detailed description thereof will be omitted.

FIG. 7 is a sectional view showing main parts of an insulating structure for a liquefied natural gas storage tank according to another embodiment of the present invention. As shown, the insulating structure for the liquefied natural gas storage tank is the lower insulation board 110, the flat plate 120, the coupling plate 130, the secondary barrier 140, the secondary secondary barrier 150 and the fixed support ( 160, but the other configuration except that it includes a fixed support 160 is substantially the same as the configuration of the thermal insulation structure shown in Figure 6, only the matters for the fixed support 160 will be described here and the remaining configuration Description of the description is omitted.

The fixed support 160 is provided to fix the lower insulation board 110 to the storage tank. The lower insulation board 110 is basically attached to the inner surface of the storage tank by an adhesive 10 such as mastic. However, for example, when the secondary barrier 140 and the secondary secondary barrier 150 are welded and joined, since the amount of heat shrinkage is large, the metal secondary barrier 140 and the secondary secondary barrier 150 are broken down. As a result, a phenomenon in which the end of the lower insulation board 110 is lifted upward may occur, and the fixed support 160 serves to prevent such a phenomenon.

The fixed support 160 may be mounted on the edge side of the flat plate 120 and the lower insulation board 110, and may include a fixing member 162, a bolt member 164, and foam members 165 and 166.

The fixing member 162 has an upper opening and an empty cylindrical shape, and various shapes such as a cylindrical shape or a square cylinder shape are possible and are not particularly limited. The upper end of the fixing member 162 is fixed to the flat plate 120 and the lower end is fixedly mounted to the lower insulating board 110 through the flat plate 120 to connect and support the flat plate 120 and the lower insulating board 110. . The fixing member 162 is disposed so that its upper end is located between the edge of the flat plate 120 and the joining plate 130, the wing portion for fixing with the flat plate 120 on the top of the fixing member 162 (Not shown) may be formed to protrude outward, and the wing portion of the fixing member 162 may be coupled to the flat plate 120 by a screw 163.

The bolt member 164 penetrates the bottom surface of the fixing member 162 and the lower insulation board 110 so that the lower end thereof is fixed to the inner surface of the storage tank so that the lower insulation board 110 is fixed to the inner surface of the storage tank. An example of the bolt member 164 may be a stud bolt.

The foam members 165 and 166 include a first foam member 165 and a second foam member 166. The first foam member 165 is inserted into and inserted into a groove (not shown) formed in the lower insulation board 110, and has a hollow into which the bolt member 164 may be inserted. The second foam member 166 fills the inner space of the fixing member 162 fixed to the flat plate 120 and the lower insulation board 110. As the first foam member 165 and the second foam member 166, for example, styrofoam or glass wool may be applied.

For reference, FIG. 7 illustrates that the inclined portion 128 is formed on the flat plate 120 and the fixed support 160 is applied when the corrugation of the auxiliary secondary barrier 150 is in a downward concave shape. Naturally, it can be applied even when the edges of the flat plate 120 as shown in FIGS. 3 and 4 are angled.

A process of installing the heat insulating structure for the LNG storage tank according to another embodiment of the present invention as described above will be described with reference to FIG. 7. First, the plate 120 is adhesively fixed to the lower insulation board 110, and a plurality of grooves (not shown) are formed at the edges of the plate 120 and the lower insulation board 110, and the outside of the storage tank. Can be pre-fabricated in bulk. Then, a plurality of bolt members 164 are fixedly spaced apart from each other at predetermined intervals on the inner surface of the storage tank.

Then, an adhesive is applied to the bottom of the lower insulation board 110 and adhered to the inner surface of the storage tank. In this case, the bolt member 164 penetrates the bottom of the lower insulation board 110 and is positioned inside the groove, and fixes the bottom of the lower insulation board with a nut (not shown). When the plywood is attached to the bottom of the lower insulation board 110, the bolt member 164 penetrates the plywood and is similarly fixed by the nut.

Then, the first foam member 165 is inserted into the groove of the lower insulation board 110, but the bolt member 164 is inserted into the hollow of the first foam member 165. In this case, an adhesive may be applied to the outer surface and the hollow inside of the first foam member 165. The first foam member 165 may be firmly fixed with a nut (not shown) pressing the upper end of the first foam member 165.

Then, the fixing member 162 of the fixing support 160 is inserted and fixed to be positioned above the first foam member 165, and the inside of the fixing member 162 is filled with the second foam member 166.

Then, the mounting plate 130 for mounting on the mounting portion 124 of the flat plate 120 is fixed with rivets 132, and then the secondary barrier 140 is bonded to the upper surface of the flat plate 120 and the secondary The barrier 140 is bonded to the joining plate member 130 by welding.

Then, the lower insulation structure 100 is completed by welding the two sides of the auxiliary secondary barrier 150 to the secondary barrier 140 on the lower insulation board 110 adjacent to each other.

Thereafter, the upper insulation structure 200 may be laminated and fixed on the lower insulation structure 100.

100: lower insulation structure 200: upper insulation structure
110: lower insulation board 120: flat plate
124: seating portion 126: groove portion
128: inclined portion 130: bonding plate
132 rivet 140 secondary barrier
150, 150: secondary secondary barrier 160: fixed support
162: fixing member 163: screw
164: bolt member 166: foam member

Claims (10)

In the liquefied natural gas storage tank is provided with a plurality to insulate the interior of the storage tank, the insulating structure comprising a lower insulating structure and an upper insulating structure laminated on the lower insulating structure,
The lower insulation structure,
A lower insulation board fixed to an inner surface of the storage tank;
A flat plate laminated on the lower insulation board;
A secondary barrier laminated and fixed on the plate; And
Both side ends are seated and fixed on the lower insulation board adjacent to each other, the insulating structure for a LNG storage tank comprising a secondary secondary barrier connecting the lower insulation board. The method of claim 1,
The lower insulation structure further includes a plate for coupling between the plate and the secondary barrier spaced apart from the four edges of the plate by a predetermined interval inwardly fixed to the plate and the secondary barrier liquefied natural gas storage Insulation structure for tanks. The method of claim 2,
The plate is a heat insulating structure for a LNG storage tank including a seating portion is formed recessed so that the coupling plate can be inserted. The method of claim 3,
The secondary barrier is welded to the coupling member, the secondary secondary barrier is a heat insulating structure for a LNG storage tank is welded to the secondary barrier. 5. The method of claim 4,
The secondary barrier is adhered to the plate by an adhesive, the plate further includes a first groove formed recessed along the inner side of the seating portion to accommodate the adhesive flowing toward the joining plate for the LNG tank Insulation Structure. The method of claim 5,
The flat plate is a heat insulating structure for a liquefied natural gas storage tank further comprises a plurality of second grooves formed in the inner portion of the first groove. The method of claim 2,
The lower insulation structure further comprises a fixed support for mounting to the edge of the flat plate and the lower insulation board fixed to support the lower insulation board to the storage tank. The method of claim 7, wherein
The fixed support is,
A fixing member having an upper opening and an empty cylindrical shape and having an upper end fixed to the flat plate and a lower end penetrating the flat plate to the lower insulating board;
Insulating structure for a liquefied natural gas storage tank including a bolt member is fixed to the inner surface of the storage tank through the bottom surface and the lower insulating board of the fixing member. The method according to any one of claims 1 to 8,
Insulating structure for liquefied natural gas storage tank in which the inclined portion of a predetermined angle is formed on the upper edge of the mutually opposite edges of the plates stacked on the lower insulating boards adjacent to each other. In the method of constructing the lower insulation structure of the insulation structure for liquefied natural gas storage tank according to claim 8,
Stacking and fixing the plate to the lower insulation board and forming a plurality of grooves at edges of the lower insulation board and the plate;
Fixing a plurality of bolt members to an inner surface of the storage tank;
The adhesive is applied to the bottom surface of the lower insulation board and adhered to the inner surface of the storage tank, but the bolt member penetrates the bottom portion of the lower insulation board to be positioned inside the groove, and then the bottom portion of the lower insulation board is fixed with a nut. Making a step;
Inserting and attaching a first foam member having a hollow into which the bolt member can be inserted into the groove of the lower insulation board and fixing an upper end of the first foam member with a nut;
Inserting and fixing the fixing member so as to be positioned above the first foam member;
Filling the inside of the fixing member with a second foam member;
Fixing the coupling plate to the plate;
Adhering the secondary barrier onto the plate and welding the secondary barrier to the joining plate; And
And installing the auxiliary secondary barrier on both sides of the auxiliary secondary barrier on the secondary barrier on the adjacent lower insulation board, and welding the secondary secondary barrier.

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