KR100499713B1 - Anchor of a lng storage tank - Google Patents

Abstract

The present invention relates to an anchor of a liquefied natural gas storage tank, wherein a liquefied natural is installed inside the structure to connect a heat insulating wall and a sealing wall of a storage tank formed inside a structure for storing a liquefied natural gas, which is a liquid of cryogenic state. In the anchor structure for providing an anchor of the gas storage tank, interconnecting the unit structure of the storage tank for this purpose, the anchor of the liquefied natural gas storage tank according to the present invention is the bottom surface and the left and right partitions of the space formed inside the structure An anchor lower plate fixed to an anchor base plate having a rod support cap in which a fastening hole is formed and installed at regular intervals, an anchor rod fixed perpendicularly to the rod support cap, and an anchor portion inserted into and fixed to the anchor rod 2 The vehicle insulation wall and the anchor portion is fixed to the upper surface of the secondary insulation wall and the center is inserted into the anchor rod fixed Anchor part secondary sealing wall, Anchor part primary insulating wall is fixed to the upper surface of the anchor part secondary sealing wall and the center is inserted into the anchor rod and fixed to the upper end of the anchor rod and the anchor part primary The upper cap for fixing the heat insulating wall, and fixed to the side of the primary heat insulating wall side and the secondary sealing wall disposed adjacent, the secondary sealing wall adjacent to the anchor portion is separated from the primary heat insulating wall by a predetermined distance And a planar connection insulating wall fixed to an upper portion of an end of the anchor secondary sealing wall.

Description

Anchor for LNG Tanks {ANCHOR OF A LNG STORAGE TANK}

The present invention relates to an anchor of a liquefied natural gas storage tank installed inside the structure, and more particularly, to connect the insulating wall and the sealing wall of the storage tank formed inside the structure for storing the liquefied natural gas, which is a liquid in the cryogenic state. The present invention relates to an anchor of a liquefied natural gas storage tank installed inside the structure.

Generally, liquefied natural gas (Liquefied Natural Gas.LNG) is a liquefied natural gas, which is one of fossil fuels, and a liquefied natural gas storage tank is a land-type storage tank installed on the ground or buried in the ground depending on where it is installed. It is classified into a mobile storage tank installed in a vehicle or a vehicle.

The above-described liquefied natural gas has a risk of explosion when exposed to an impact, and is stored in a cryogenic state. The storage tank storing the liquefied natural gas has a structure in which impact resistance and liquid tightness are firmly maintained. Such tanks are somewhat different in that the structure of LNG storage tanks installed in automobiles and ships with flows should be prepared against mechanical stress caused by flows, compared to land tanks with little flow. . However, since the liquefied natural gas storage tank installed in the vessel provided with a countermeasure against mechanical stress can of course be used in a land-type tank, the present specification describes the structure of the liquefied natural gas storage tank installed in the vessel as an example.

First, the liquefied natural gas (Liquefied Natural Gas. LNG) storage tank installed inside the LNG carrier can be divided into an independent tank type and a membrane type. This is a classification according to whether the load of the cargo directly acts on the insulation, the details are as follows.

In Table 1, aka GTT NO 96-2 type and GTT Mark III type were renamed Gaz Transport (GT) and Technigaz (TGZ) in 1995 as GTT (Gaztransport & Technigaz), respectively, GT type was GTT NO 96 -2 type, TGZ type is renamed GTT Mark III type.

Classification of LNG Storage Tanks division Membrane Type Independent Tank Type GTT Mark III GTT NO 96-2 MOSS IHI-SPB Tank Material-Thickness SUS 304L-1.2 mm Invar steel-0.7 mm AI alloy steel (5083) -50 mm AI alloy steel (5083) 30 mm Heat dissipation material-thickness Reinforced Polyurethane Foam-250 mm Plywood Box + Perlite-530 mm Polyurethane Foam-250 mm Polyurethane Foam-200 mm

GTT's membrane type LNG carriers are equipped with a cofferdam in order to directly insulate the insulation and the hull and to avoid the risk of mechanical and thermal characteristics between the cargo tank and the cargo tank. In order to prevent low temperature brittleness of the inner hull of the cofferdam, it should be maintained at + 5 ° C or higher. For this purpose, heating means such as heating coils are generally installed to use a heat source such as steam or hot water. Insulation construction is completed by installing the chiefs in the hull first, then installing the chiefs and the insulation boxes, membranes and other materials completed on land. In the case of older tanks, the membrane method has a longer post-launch time compared to a longer working period before launch.

As shown in FIGS. 1 and 2, the NO 96-2 type of GTT's membrane type uses Invar steel (36% Ni) having a thickness of 0.5 to 0.7 mm, and a primary sealing wall 10. And the secondary sealing wall 15 has almost the same degree of liquid tightness and strength, so that the secondary sealing wall 15 alone can safely support the cargo for a considerable period of time upon leakage of the primary sealing wall 10. Also, the sealing walls 10 and 15 of GTT NO 96-2 type have a straight membrane, so welding is easier than that of Mark III type membrane, and the automation rate is high, but the overall welding site has a long GTT NO 96-2 type. .

In addition, the biggest difference between the existing GT type and the currently adopted GTT NO 96-2 type is the use of a double couple (17) instead of the U-shaped bar supporting the insulation box (insulation walls 11, 16). It is. The functions of the main parts of the heat dissipation section of the storage tank of GTT NO 96-2 type LNG carrier are shown in Table 2.

Main part of heat dissipation section of GTT NO 96-2 type storage tank division function Tongue It is installed in the insulation wall box, and it is connected by welding three layers between the membrane sheet and the membrane sheet, and connects the membrane wall box with the membrane. Joist It is installed between the insulation wall box and the insulation wall box to alleviate the horizontal displacement and prevent the occurrence of high stress. Primary and Secondary Insulation Wall (Perlite) Prevent heat from entering the storage tank. Primary Sealed Wall (Invar) The storage tank is primarily composed of the part where the cargo of -163 ℃ directly contacts with the primary sealing wall. Second Sealing Wall (Invar) As a secondary method, it prevents the leakage of cargo for a certain period of time when the primary membrane is broken.

On the other hand, Mark III type of GTT, as shown in Figure 3 and 4, is a stainless steel membrane (Membrane) with a 1.2 mm thick corrugation to the primary sealing wall 20, the shrinkage due to low temperature is Absorbed from the pleats, little stress is generated in the membrane. In addition, Balsa material, Glass Wool, Triplex, etc. are used as the material of the insulation walls 21 and 26. Mark Ⅲ type is equipped with the primary and secondary insulation walls (Insulation) (21, 26) onshore and is integrally mounted, so that the box-shaped primary and secondary insulation walls (21, 26) must be installed, respectively GTT NO Construction is relatively easy compared to 96-2 type.

The function of the main part of the heat dissipation section of the LNG carrier storage tank of the GTT Mark III type is shown in Table 3 below.

Main part of heat dissipation section of Mark III type storage tank division function Mastic Transfer the load from the storage tank to the hull. Plywood It is installed between the primary and secondary sealing walls and the primary and secondary insulating walls. The uniform arrangement of the insulating walls helps to receive a constant load on the sealing walls, and alleviates the displacement caused by the vertical load. Glass wool It is installed between the insulation wall box and the insulation wall box to alleviate the horizontal displacement and prevent the occurrence of high stress. Primary and Secondary Insulation Walls (Polyurethane Foam) Prevent heat from entering the storage tank. Secondary Triplex When the primary membrane, which is the primary sealing wall, is damaged, it has the function of preventing the leakage of cargo for a certain period of time. Glass cloth is attached to both sides of Al Foil. Primary sealing wall (SUS 304L) The primary membrane is a cargo tank directly touching -163 ℃. The cargo tank is composed primarily of corrugated structure to withstand thermal stress.

The corner part occupies an important part of the GTT NO 96-2 type storage tank structure and the GTT Mark III type storage tank structure having the above structure.

Here, the corner portion (edge portion) in the LNG storage tank is a region in which loads due to thermal deformation of each sealing wall (membrane) constituting the storage tank act asymmetrically, and is stored by dispersing such an asymmetrical load. It must be constructed structurally to relieve stress from the tank.

The membrane type liquefied natural gas storage tank described above is to reduce the BOG (boil of gas) which is a loss due to the vaporization of liquefied natural gas which is a cryogenic liquid yet, to simplify the structure of the complex insulation and sealing walls, and to simplify the manufacturing process. Although efforts have been made over the decades in terms of reducing the tank drying period, stress relief at the corners of the tank and sealing walls, there is still a need for further improvement.

Accordingly, the present invention is to invent the membrane-type LNG storage tank having a new structure different from the conventional membrane-type LNG gas storage tank to improve the various problems.

The planar structure installed on the bottom bottom surface of the storage tank has a plurality of structures, each planar structure is fixed by the anchor structure. On the other hand, the planar structure is deformed to the hull during the movement of the ship or by the current flow, and thus mechanical or thermal stress is generated, and the continuous technical development to solve this has been made.

In addition, in order to reduce the BOG (boil of gas) loss due to vaporization of cryogenic liquid LNG, simplify the structure, and simplify the manufacturing process, a membrane type LNG storage tank having a new structure different from the conventional membrane LNG storage tank has been proposed. In addition, the structure of the anchor structure for fixing the planar structure also requires a new structure.

Accordingly, the 'anchor structure of the liquefied natural gas storage tank installed inside the ship' has been proposed by the present applicant as a patent application No. 2004-103256, and the continuous development for improving the performance is being made.

The present invention solves the problems of the anchor of the liquefied natural gas storage tank according to the prior art, while simplifying the assembly structure and manufacturing process to shorten the drying period of the tank, the anchor portion more than the mechanical stress generated from the storage tank The purpose is to provide an anchor of a liquefied natural gas storage tank of a new structure for efficient resolution.

In order to achieve the above object, the anchor of the liquefied natural gas storage tank according to the present invention is a secondary insulating wall, the secondary sealing wall, and the primary insulating wall sequentially stacked in the internal space of the structure for storing the liquefied natural gas In the anchor for interconnecting the unit structure of the liquefied natural gas storage tank, the anchor base plate is installed in the bottom surface and the left and right partitions of the space formed inside the structure at regular intervals and the rod support cap is formed with a fastening hole is fixed An anchor lower plate, an anchor rod vertically fixed to the rod support cap, an anchor portion secondary heat insulation wall in which a center portion is inserted and fixed to the anchor rod, and fixed to an upper surface of the anchor portion secondary heat insulation wall and the anchor Anchor part secondary sealing wall to which the center is inserted and fixed to the rod, Anchor part is fixed to the upper surface of the anchor part secondary sealing wall and the center is inserted and fixed to the anchor rod A primary heat insulating wall, an upper cap fixed to an upper end of the anchor rod and fixing the anchor primary heat insulating wall, and fixed to an upper surface of the secondary sealing wall, and arranged adjacent to the anchor primary heat insulating wall. Located between the sides of the primary heat insulating wall, and includes a planar connection heat insulating wall fixed to the upper portion of the end of the neighboring secondary sealing wall and the anchor portion secondary sealing wall.

Here, the planar connection insulating wall may be fixed to the upper surface of the secondary sealing wall fixed to the upper side of the secondary insulating material adjacent to each of the adjacent primary insulating wall side. Further, the planar connection insulating wall may be fixed by an adhesive with the planar secondary sealing wall and anchor secondary sealing wall thereunder. In addition, a heat insulating material may be filled in the space portion between the planar connection insulation wall and the anchor portion primary insulation wall.

In addition, the heat insulating material may be glass wool. In addition, the secondary sealing wall is a resin material is applied to the upper surface and the lower surface and extends into the space portion formed by the adjacent heat insulating wall, the space portion is the upper connection member coupled to abut the end of the secondary sealing wall; The groove includes a lower connection member, and a concave-convex portion formed to be opposed to each other is formed on a coupling surface of the upper connection member and the lower connection member to compress the resin material applied to the upper surface and the lower surface of the secondary sealing wall. Can be formed. In addition, the resin material may be a curable resin. In addition, the uneven parts may be formed to face each other.

Accordingly, the present invention further improves the bonding structure of the secondary sealing wall around the anchor portion by the bonding between the planar connection insulating wall and the secondary sealing wall below, and the coupling structure of the vertical connecting members. As a result, the airtightness and safety are further increased.

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

The present invention is a liquefied natural gas storage tank, is installed in the structure to store the liquefied natural gas of a high pressure, cryogenic state. To this end, the liquefied natural gas storage tank has a structure in which impact resistance and liquid tightness are maintained firmly.

Liquefied natural gas storage tanks installed in automobiles and ships with cargo flow are different in that they have to be prepared for mechanical stress caused by the flow of cargo, compared to land tanks with little flow. However, since the liquefied natural gas storage tank installed in the vessel provided with a countermeasure against mechanical stress can of course be used in a land-type tank, the present specification describes the structure of the liquefied natural gas storage tank installed in the vessel as an example.

Liquefied natural gas storage tank according to the present invention is a secondary heat insulating wall is installed to interview the surface formed inside the hull of the ship, the secondary sealing wall formed on the upper surface thereof and the primary heat insulating wall formed on the upper surface thereof In the present invention, the tank structure is to be pre-fabricated in the tank inner space by producing a corner structure, a planar structure, respectively, as a pre-assembly outside the vessel.

That is, the pre-fabricated corner structure is first fixed inside the hull, and then a flat structure based on this is assembled. The fixing of the flat structure is performed by assembling the anchor structure at the assembly site of the tank.

5 is a cross-sectional view showing the internal structure of the corner structure constituting the liquefied natural gas storage tank according to the present invention, Figure 6 is a connection relationship of the corner structure of the liquefied natural gas storage tank installed in the ship according to the present invention It is the whole perspective view shown. 7 is a partially enlarged cross-sectional perspective view showing a corner structure of the liquefied natural gas storage tank installed in the ship according to the present invention.

The corner structure 100 is, as shown in Figures 5 to 7, the corner secondary insulation wall 53 is formed in a shape having a predetermined angle so as to interview each of the corner point where the hull surface of the ship meets. , And the corner secondary sealing wall 52 is attached and fixed to the upper surface thereof in the same form, and is pre-assembled in a structure in which the corner primary insulating wall 51 is formed on the upper surface thereof. Here, the corner portion primary insulation wall 51 and the corner portion secondary insulation wall 53 are preferably adhered to the upper and lower surfaces of the corner portion secondary sealing wall 52 by adhesive to be firmly fixed. Do.

The above-described connection between the corner support plate 50, the primary and secondary insulating walls 51 and 53, the secondary sealing wall 52 and the upper and lower supporting rods 70 and 60 will be described in more detail. Same as

The interior of the vessel for storing the liquefied natural gas (LNG) is formed with the bottom bottom surface 1 and the partition wall (2) integrally therewith to form a space in which the corner structure of the present invention can be installed.

As described above, at the point where the lower bottom surface 1 and the partition wall 2 meet at a predetermined angle, the L-shaped secondary insulating wall 53 which is in contact with the lower bottom surface 1 and the partition wall 2 is provided. Is formed. In the present invention, the use of the terms 'primary' and 'secondary' is a function of primarily sealing or insulating the liquefied natural gas based on the liquefied natural gas stored in the storage tank. It is used as a division criteria for functioning.

The secondary heat insulating wall 53 is formed of a secondary heat insulating material 58 of polyurethane foam material and a second heat insulating wall plate 56 of plywood material bonded to the lower surface thereof. The secondary insulation wall plate 56 is to be in contact with the lower bottom surface 1 and the partition wall 2 formed inside the hull.

When the secondary heat insulation wall 53 is formed, the secondary sealing wall 52 is positioned on the upper surface thereof. The secondary sealing wall 52 serves to block secondary 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 bonded to the lower surface of the secondary sealing wall 52 by an adhesive. The material of the secondary sealing wall 52 is preferably an aluminum sheet or a flexible sheet (aka 'Triplex').

As described above, when the secondary heat insulating wall 53 and the secondary sealing wall 52 are combined, the lower support rod 60 for fixing with the primary heat insulating wall 51 formed on the upper surface thereof. It penetrates the secondary heat insulation wall 53 and the secondary sealing wall 52.

That is, the secondary insulating wall 53 has a through hole through which the lower support rod 60 can pass at a predetermined interval, and the lower support rod is formed at a lower portion of the through hole formed in the secondary insulating wall plate 56. The rod support cap 61, which can be firmly fixed to the lower part of the 60, is inserted and supported by the secondary heat insulation wall plate 56.

The lower support rod 60 is inserted into the rod support cap 61 to penetrate the secondary heat insulation wall 53, and then the lower portion of the lower support rod 60 is fixed nut 62 in the support cap 61. ) Is firmly fixed.

In addition, an upper portion of the lower support rod 60 that penetrates the secondary insulation wall 53 passes through a secondary sealing wall 52 fixed to an upper surface of the secondary insulation wall 53. The sealing wall 52 is fixed on the lower support rod 60 by the support nut 63 and the sealing wall fixing nut 64 fastened to the lower support rod 60.

As described above, the upper end portion of the lower support rod 60 fixed through the secondary insulation wall 53 and the secondary sealing wall 52 is fixed through the lower portion of the primary insulation wall 51.

That is, the primary heat insulating wall 51 is attached and fixed to the secondary sealing wall 52 fixed to the upper surface of the secondary heat insulating wall 53, the configuration is the secondary sealing wall 52 and Primary insulation wall 51 to be attached and fixed by an adhesive or the like by interviewing The upper plate 55 and the primary insulation material 57 formed on the upper surface thereof and the upper portion of the primary insulation wall 51 attached and fixed to the upper surface thereof It is made of a plate 54. The upper and lower plates 54 and 55 of the primary insulation wall are made of plywood, and the primary insulation 57 is made of polyurethane foam.

At this time, the connection reinforcing rod 90 is positioned on the lower plate member 55 of the primary heat insulating wall 51 through which the lower support rod 60 penetrates. That is, the upper end portion of the lower support rod 60 fixed through the secondary insulation wall 53 and the secondary sealing wall 52 is located on the lower plate 55 of the primary insulation wall 51. Penetrating through the reinforcement 90 is to be fixed in a bolt-nut fastening method.

The lower portion of the plurality of (pair in the drawing) of the upper support rod 70 is fixed to the connecting reinforcement 90, the fixing method is fixed to the lower surface of the connecting reinforcement 90 in the same manner as welding The upper support rod 70 is inserted into the rod support cap 71 and then fixed to the fixing nut 72.

Accordingly, the upper end of the lower support rod 60 penetrating the secondary heat insulation wall 53 and the secondary sealing wall 52 and the lower end of the upper support rod 70 penetrating the primary insulation wall 51 are firmly secured. It is fixed.

In addition, the upper plate 54 of the primary heat insulating wall 51 is fixed and supported on the upper surface of the upper support rod 70, and the upper surface of the upper plate 54 of the primary heat insulating wall 51. The corner support plate 50 having a predetermined angle is positioned and supported to receive the asymmetrical load of the storage tank. Here, the corner support plate 50 is mechanically coupled so as to be slidably movable without bonding with the adhesive of the primary heat insulation wall 51 to enable contraction and extension by heat. The primary sealing wall 250 to be described later is located on the corner support plate 50.

In addition, 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) material, the corner secondary sealing wall 52 is the corner portion It is formed to protrude more than the cross-section of the primary insulating wall 51 and the corner secondary insulating wall 53 to be fastened to the neighboring secondary sealing wall 203 in a later process.

FIG. 8 is a partially cutaway perspective view illustrating a storage tank of liquefied natural gas installed in a ship according to the present invention. The planar structure 200 constituting the present invention is shown in FIG. It is introduced into the hull in a pre-assembled state, the structure of the planar structure 200 is made of a similar configuration to the corner structure 100, the upper portion of the planar primary insulation wall 204 of the plywood material An upper plate (not shown) is installed.

That is, the flat plate secondary heat insulating wall lower plate 201 in contact with the bottom surface (1) or the partition wall (2) formed inside the hull is provided, the flat portion 2 of the polyurethane foam (Polyurethane Foam) material on the top surface The primary insulating wall 202 is attached, and the upper side is again attached with a flat secondary sealing wall 203 made of aluminum sheet or flexible sheet, and the polyurethane foam is again attached to the upper side. ) Is made of a structure to which the planar portion of the primary insulating wall 204 and the plywood upper plate 205 is attached.

In addition, the planar secondary insulating wall lower plate 201 and the secondary sealing wall 203 is slightly protruded from the side of the primary and secondary insulating walls (202, 204) to the neighboring planar structure 200 or later in the process The corner structure 100 is to be mutually fixed and fixed, the corner portion of the opposite surface in contact with the corner structure 100 is formed in a stepped shape cut in part to be assembled and fixed by the anchor structure 150 of the present invention. The height of the planar structure 200 of the present invention having such a structure is manufactured to be equal to the height of the neighboring corner structure 100.

On the other hand, the planar structure 200 configured as described above forms a unit structure of the liquefied natural gas storage tank, each planar structure 200 is fixed by an anchor structure 150 for fixing it.

Hereinafter, a process of installing a liquefied natural gas storage tank and the tank structure according to the present invention will be described in detail with reference to Figs. 9 to 21, such a series of assembling process of manufacturing a liquefied natural gas storage tank of the present invention It is a way.

First, as shown in FIGS. 9 and 10, the bottom surface of the anchor base plate 110 of the anchor structure 150 for fixing the planar structure 200 continuously installed from the corner structure 100 to each other. It is fixed to (1) and the partition (2) surface at regular intervals. To this end, a group of stud pins 109 are installed on the inner surface of the hull at regular intervals. At this time, the stud pin 109 is sharply processed to the bottom surface 1 or the part in contact with the partition wall 2, and then welded in a pressurized state, the stud pin 109 to the inner wall surface of the hull Are welded.

Next, as shown in FIGS. 11 and 12, an anchor base plate 110 having a through hole corresponding to the stud pin 109 is inserted into the stud pin 109. In addition, a rod support cap is built in the anchor base plate 110, and the thickness thereof is the same as the thickness of the flat plate secondary insulation wall lower plate 201.

The rod support cap 120 includes a nut therein, or a nut structure is integrally formed. In the drawing, a central portion of the rod support cap 120 is nut processed. That is, the rod support cap 120 and the nut are the same as the rod support cap 61 and the fixing nut 62 shown in FIG.

Next, as shown in FIG. 12 and FIG. 13, the anchor base plate 110 and the upper portion of the anchor base plate 110 so as to cover the periphery of the flat plate secondary insulating wall lower plate 201. The anchor bottom plate 111 is coupled to. To this end, the anchor lower plate 111 has a through hole formed at a position corresponding to the stud pin 109, and the anchor base plate is fastened to the stud pin 109 passing through the anchor lower plate 111. The fixing of 110 is made.

As such, the planar structure 200 has the lower plate 201 coupled to the anchor base plate 110 at the lower end. Accordingly, the planar structure 200 can be moved horizontally but the upward movement is limited.

Next, the anchor support rod 112 is vertically fixed to the rod support cap 120 installed at the center of the anchor lower plate 111.

Here, the anchor support rod 112 may be heat transfer to the upper or lower, but in the design considering the diameter of the anchor support rod 112 and the heat transfer rate to other parts from the liquefied natural gas in the tank to the hull It is desirable to minimize heat transfer.

The anchor support rod 112 serves to primarily support the load generated from the primary sealing wall attached in a later process.

It is to fix the position of each planar structure 200 around the anchor lower plate 111 and the anchor support rod 112 of the present invention by the fixing method as described above. In this case, the planar structure 200 is inserted and fixed between the gap formed by the lower bottom surface 1 and the anchor lower plate 111.

As described above, when the planar structure 200 is inserted and fixed around the anchor lower plate 111 and the anchor support rod 112 forming the anchor structure of the present invention, as shown in FIGS. 14 and 15, The anchor secondary insulation wall 113 is inserted.

On the upper surface of the anchor secondary insulating wall 113, an anchor secondary sealing wall 114 having a circular corrugation 115 is positioned, and the anchor secondary sealing wall 114 supports the anchor. While being supported by the locking jaw 121 formed in the rod 112, it is firmly fixed by the fixing nut 123 is bolted to the support rod 112 after being inserted.

The wrinkle part 115 serves to absorb mechanical or thermal stress generated in the anchor part secondary sealing wall 114 to prevent breakage of the anchor part secondary sealing wall 114.

In addition, when the hull is curvedly deformed by the movement of the ship or by the current flow of the corrugated portion 115, there is a tendency to open the connection between the planar structure 200 is coupled to the inner surface. At this time, since the planar structure 200 of the storage tank according to the present invention is hung on the anchor support plate of the anchor structure, the sliding structure is moved to some extent in a state where the separation is prevented.

When stress is generated in the hull for the above reason, the corner structure 100 is fixed, but each planar structure 200 is capable of partial transverse movement during the deformation of the hull, so that the deformation of the hull insulated wall layer itself Can absorb.

In addition, the wrinkles 115 may be extended or contracted in the direction in which the planar structure 200 is slidably moved when the planar structure 200 is slid to absorb mechanical or thermal deformation applied to the insulation or the sealing wall. have.

The planar structure 200 is preferably introduced into the hull in a pre-assembled state outside the hull.

That is, the flat plate secondary insulation wall lower plate 201 is provided to the lower bottom surface 1 to be interviewed, the flat portion secondary insulation wall 202 of the polyurethane foam (Polyurethane Foam) is attached to the upper surface To this upper surface, a flat portion secondary sealing wall 203 made of an aluminum sheet or a flexible sheet (Triplex, preferably Rigid Triplex) is attached, and again, a polyurethane foam material is attached to the upper surface. The planar portion of the primary insulating wall 204 and the upper plate 205 of plywood material is attached.

In addition, a plane is formed on the side of each of the adjacent planar primary insulating walls 204 and the upper surface of the secondary sealing wall 203 fixed to the upper part of the planar secondary insulating wall 202 adjacent to the lower portion thereof. The secondary connection heat insulation wall 207 is installed. In addition, in the embodiment of the present invention, the planar connection insulating wall 207 is fixed to the upper surface of the secondary sealing wall 203 or the anchor secondary sealing wall 114 with an adhesive.

In this case, the planar connection insulating wall 207 may be formed with a gap (that is, 1 to 4mm) spaced apart from the side surface of the adjacent planar primary insulating wall 204 by a predetermined distance. When the hull is deformed, the planar structure 200 may provide a space in which the flow may flow to absorb the deformation amount.

In addition, the planar connection insulating wall 207 is positioned above each of the neighboring secondary sealing walls 203 so that the anchor portion secondary sealing wall 114 and the planar portion secondary sealing wall 203 Secure the ends.

Accordingly, since the planar connection insulating wall 207 is strongly adhered to the planar secondary sealing wall 203 or the anchor secondary sealing wall 114 with an adhesive, the primary sealing wall is damaged. Even if the LNG cannot reach the connecting portion of the flat secondary sealing wall 203 or the anchor secondary sealing wall 114, the leakage of liquefied natural gas, which may occur, is reliably blocked.

As described above, after each of the secondary sealing walls 114 and 203 is fixed by the fixing means, in the order shown in FIGS. 16 to 20, the anchor portion primary insulation wall ( 116 is inserted, and the anchor top plate 117 is inserted into the circular recess formed in the upper surface of the anchor portion primary insulation wall 116 to be fixed to the upper end of the anchor support rod 112.

Then, the anchor insulation plate 118 is attached and fixed to the upper surface again, and the circular anchor upper cap 119 is inserted and fixed again to the center portion. To this end, a predetermined slotting space is formed in the upper center of the anchor insulation plate 118, and the anchor upper cap 119 is located in the space. The anchor upper cap 119 includes a nut, or the nut structure is integrally formed so as to be coupled to the upper end of the anchor support rod 112 to complete the assembly of the anchor structure 150.

Through the assembly process described above, the insulating material may be filled in the space portion (the upper portion of the space portion formed by the secondary heat insulation wall) of the primary heat insulation wall 116 formed by the anchor structure and the planar structure 200 according to the present invention. . In this case, glass wool (Glass Wool. 125) is used as the insulating material to be filled in order to more easily cope with the thermal contraction of the primary insulating wall to relieve thermal stress.

After filling the heat insulating material such as glass wool in the space formed by the primary heat insulating wall, as shown in FIG. 21, the membrane-shaped primary sealing wall 250 having a pleated portion 251 on the upper surface thereof. ) Will be fixed. The material of the primary sealing wall 250 is mainly made of a stainless steel material excellent in corrosion resistance and thermal stability.

On the other hand, the material of the primary sealing wall 250 may be made of a material known from a conventional Mark III type tank or disclosed in a patent known by the applicant (Domestic Patent Application No. 2001-0010438 or 2001-0010152). It is possible to deform even in the shape.

In addition, the wrinkles 251 is formed in the longitudinal direction along the space portion formed by each assembly structure, a plurality of wrinkles 251 is formed around the wrinkles 251 around the center. The wrinkle part 251 is intended to easily solve the thermal deformation in response to the elastic contraction and expansion of the primary sealing wall 250 is the most severe occurs in direct contact with the stored liquefied natural gas. Further, the reason why the wrinkle part 251 is formed in the same length direction on the upper part of the space in which each primary heat insulating wall is formed is mutually dependent on thermal contraction and expansion of the primary heat insulating wall and the secondary sealing wall attached thereto. Correspondingly, the thermal stress of the storage tank structure can be easily solved.

22 and 23 are cross-sectional views showing an enlarged state diagram of the secondary sealing wall in the liquefied natural gas storage tank according to the present invention.

Here, the manner in which the secondary sealing wall 203 is fixed is fixed by the fixing means as shown in Figs. 22 and 23, this fixing method is applied to all of the secondary sealing wall of the present invention to mutually fixed It is done.

That is, as an example, as shown in Fig. 22, to the site where the respective secondary sealing wall 203 protruding into the space portion formed by the adjacent planar primary and secondary insulating walls 202 and 204 of the present invention are close to each other. An upper connection member 212 and a lower connection member 213 coupled to the ends of the secondary sealing wall 203 are installed.

In addition, the secondary sealing wall 203 is coated with a resin material 203a on the upper and lower surfaces, respectively, and extends into the space portion formed by the adjacent heat insulating walls.

At this time, although not particularly limited, if the lower connection member 213 and the upper connection member 212 are fixed as the direct connection screw 214, the secondary sealing wall 203 is firmly fixed. Further, for this purpose, the through portion for inserting the direct connection screw 214 is formed in the planar connection insulating wall 207.

Here, the direct screw 214 is a structure that is fastened by directly drilling the upper connection member 212 or the lower connection member 213, it is possible to work without forming a separate bolt fastening hole.

In addition, the direct screw 214 includes a flat washer or a spring washer to maintain the upper portion of the heat insulating material pressed in a predetermined pressure. In this case, the direct screw 214 is preferably fastened by reducing the volume of the heat insulating material, that is, the decrease in thickness by the expansion pressure of the LNG.

On the other hand, the engaging surface of the upper connecting member 212 and the lower connecting member 213 is formed with a groove portion for receiving the secondary sealing wall. In addition, irregularities 212a and 213a formed to face each other or to face each other are formed at both ends of the groove. The above-described upper connecting member 212 and lower connecting member 213 are resin materials 203a having the uneven parts 212a and 213a applied to the secondary sealing wall 203 when fixed by the direct connection screw 214. ) Is pressed.

At this time, the resin material 203a is accommodated in the groove portion between the uneven parts 212a and 213b and a gap between the secondary sealing wall 203 and the upper connection member 212 or the lower connection member 213. Seal it. Here, the resin material 203a is made of a curable resin, which is cured after being pressed.

In addition, the planar connection insulating wall 207 is coupled to the upper surface of the planar primary insulating wall 204 and the planar secondary sealing wall 203 by an adhesive, thereby preventing the leakage of gas.

Therefore, the sealing property of the secondary sealing wall 203 is improved against the leakage of gas due to breakage of the primary sealing wall 250 which may occur even if it is.

The present invention has been applied to the specific embodiments as shown in each of the above drawings, the present invention is not limited to these specific embodiments, but can be carried out in various modifications within the scope without departing from the spirit of the present invention. Do.

In addition, the present invention can of course be equally applicable to liquefied natural gas storage tanks installed on land as well as liquefied natural gas storage tanks installed inside the hull of a shelf.

As described above, the present invention simplifies the assembly of the anchor portion connecting the planar structure of the storage tank installed inside the ship for transporting the liquid liquefied natural gas of the ultra-low temperature state, while reducing the assembly process, the adjacent planar structure By more solidifying the connection of the anchor portion of the liquid tightness is maintained firmly. In particular, in the present invention, the coupling structure of the secondary sealing wall around the anchor portion is further improved by bonding by the adhesive between the planar connection insulating wall and the secondary sealing wall below, and the coupling structure of the vertical connecting members. There is an effect of further increasing the airtightness and safety.

1 and 2 are a cross-sectional view and a perspective view showing the structure of the conventional membrane-type liquefied natural gas storage tank GTT NO 96-2 type.

3 and 4 are a cross-sectional view and a perspective view showing the structure of a conventional membrane type liquefied natural gas storage tank type GTT Mark III.

Figure 5 is a cross-sectional view showing the internal structure of the corner structure constituting the liquefied natural gas storage tank according to the present invention.

6 is an overall perspective view showing the connection of the corner structure of the liquefied natural gas storage tank installed in the ship according to the present invention.

Figure 7 is a partially enlarged cross-sectional perspective view showing a corner structure of the liquefied natural gas storage tank installed in the vessel according to the present invention.

Figure 8 is a partially cutaway perspective view showing a storage tank of liquefied natural gas installed in the ship according to the present invention.

9 to 21 are views showing a process for installing a liquefied natural gas storage tank and the tank structure according to the present invention.

22 and 23 are cross-sectional views showing an enlarged state diagram of the secondary sealing wall in the liquefied natural gas storage tank according to the present invention.

♣ Explanation of symbols for main part of drawing ♣

50: corner support plate 51: corner portion primary insulation wall

52: corner secondary sealing wall 53: corner secondary insulating wall

54, 56 plate 57, 58: heat insulating material

60: lower support rod 61: rod support cap

70: upper support rod 80, 81: corner boundary jaw

90: connection reinforcement table 100: corner structure

109: stud pin

110: anchor base plate 111: anchor lower plate

113: anchor portion secondary insulating wall 114: anchor portion secondary sealing wall

115: pleat 119: anchor upper cap

150: anchor structure 200: planar structure

201: lower plate 202: planar secondary insulation wall

203: plane portion secondary sealing wall 204: plane portion primary insulation wall

205: top plate 207: plane connection insulation wall

211: heat insulating material 212: upper connecting member

203a: resin material 213: lower connecting member

213a: Uneven portion 214: Direct screw

250: primary sealing wall 251: wrinkles

Claims (8)

An anchor for interconnecting unit structures of a liquefied natural gas storage tank in which a secondary insulating wall, a secondary sealing wall, and a primary insulating wall are sequentially stacked in an internal space of a structure storing liquefied natural gas, An anchor lower plate installed on the bottom surface and the left and right partitions of the space formed in the structure at regular intervals and fixing the anchor base plate having the rod support cap in which the fastening hole is formed; An anchor rod fixed perpendicular to the rod support cap; Anchor portion secondary heat insulation wall is inserted into the anchor rod fixed to the center, An anchor part secondary sealing wall fixed to an upper surface of the anchor part secondary heat insulation wall and having a central portion inserted and fixed to the anchor rod; Anchor part primary heat insulation wall is fixed to the upper surface of the anchor secondary sealing wall and the center is inserted into the anchor rod, An upper cap fixed to an upper end of the anchor rod and fixing the anchor insulation wall; It is fixed to the upper surface of the secondary sealing wall, located between the side of the anchor insulating portion primary insulating wall and the adjacent primary insulating wall, the end of the neighboring secondary sealing wall and the anchor secondary sealing wall Anchor of the liquefied natural gas storage tank, characterized in that it comprises a planar connection insulating wall fixed to the upper portion of the. The method according to claim 1, The planar connection insulation wall anchor of the LNG storage tank, characterized in that fixed to the upper surface of the secondary sealing wall fixed to the upper side of each of the adjacent primary insulation wall adjacent to the secondary insulation. The method according to claim 1 or 2, The planar connection insulating wall anchors the liquefied natural gas storage tank, wherein the planar secondary sealing wall and the anchor secondary sealing wall are fixed by an adhesive. The method according to claim 1 or 2, Anchor of the liquefied natural gas storage tank, characterized in that the insulating portion is filled in the space portion between the planar connection insulation wall and the anchor primary insulation wall. The method according to claim 4, Anchor of the liquefied natural gas storage tank, characterized in that the insulating material is glass wool. The method according to claim 1 or 2, The secondary sealing wall extends into a space portion in which a resin material is applied to upper and lower surfaces and adjacent heat insulating walls are formed. The space portion includes an upper connection member and a lower connection member coupled to the end of the secondary sealing wall, The liquefied natural gas storage tank, characterized in that the concave-convex portions are formed on the coupling surfaces of the upper heat-resistant member and the lower connection member, respectively, and a groove portion is formed to compress the resin material applied to the upper and lower surfaces of the secondary sealing wall. Anchor. The method according to claim 6, The resin material is an anchor of a liquefied natural gas storage tank, characterized in that the curable resin. The method according to claim 6 or 7, Anchors of the liquefied natural gas storage tank, characterized in that the concave-convex portions are formed to face each other.