KR20210012092A - Insulation Panel Securing Device of Liquefied Natural Gas Storage Tank - Google Patents

Abstract

The present invention relates to an LNG storage tank having a dual barrier structure, which includes a secondary insulation wall comprising a plurality of secondary insulation panels fixed to an inner wall of a vessel body, and a primary insulation wall comprising a plurality of primary insulation panels fixed to an upper part of the secondary insulation panels. A secondary fixing apparatus fixing the secondary insulation panels to the inner wall of the vessel body includes: a coupler rod having a lower part fixed to the inner wall of the vessel body and having an upper part extended to the inside of the LNG storage tank; a lower cleat having a penetrated space formed to store a coupler rod in the center and supported by a lower plate of the secondary insulation panels; a lower setting plate through which the coupler rod is inserted and supported by the lower cleat; a fixing nut engaged with the coupler rod to press the lower setting plate toward the inner wall of the vessel body; a lower spring washer interposed between the fixing nut and the lower setting plate; a middle cleat placed in an upper part of the lower setting plate; a middle setting plate supported by the middle cleat; an insulation block placed in an upper part of the middle setting plate; an upper setting plate supported by the insulation block; an upper fixing bolt penetrating the insulation block to fix the middle setting plate and the upper setting plate to each other; and an upper spring washer interposed between the upper fixing bolt and the upper setting plate. Therefore, the present invention is capable of effectively preventing the primary and secondary insulation panels from affecting each other.

Description

Insulation Panel Securing Device of Liquefied Natural Gas Storage Tank of LNG Storage Tank

The present invention relates to an insulation panel fixing device for an LNG storage tank, and more particularly, insulates using a mechanical fastening method in order to prevent the behavior or deformation of the hull from being transmitted to the insulation wall or the influence between the upper and lower insulation walls. It relates to an insulation panel fixing device of an LNG storage tank that fixes the panel.

Natural gas is transported in gaseous form through gas pipelines on land or sea, or stored in LNG carriers as liquefied natural gas (LNG) and transported to remote consumers. LNG is obtained by cooling natural gas to cryogenic temperatures (approximately -163°C), and its volume is reduced to about 1/600 compared to that of gaseous natural gas, so it is very suitable for long-distance transportation through sea.

Storage tanks that can withstand the cryogenic temperatures of LNG (commonly referred to as'cargo hold') are installed in structures for transporting or storing LNG, such as LNG carriers for loading and unloading LNG to land-requiring destinations by operating the sea with LNG.

LNG storage tanks can be classified into Independent Tank Type and Membrane Type, depending on whether the load of cargo directly acts on the insulation material. Usually, the membrane type storage tank is divided into GTT's NO 96 type and MARK Ⅲ type, and the independent tank type storage tank is divided into MOSS type and IHI-SPB type.

Among the membrane-type storage tanks, the NO 96-type storage tank includes primary and secondary sealing walls made of Invar (36% nickel steel) membranes with a thickness of 0.5 to 0.7 mm, and perlite in a plywood box. It includes primary and secondary insulation walls provided in the form of insulation boxes filled with insulation materials such as powder.

The NO 96 type storage tank has almost the same degree of liquid tightness and strength as the primary and secondary sealing walls, so when the primary sealing wall leaks, it can safely support the cargo with only the secondary sealing wall for a considerable period of time.

In addition, since the NO 96 type storage tank is a type of insulation wall filled with insulation material inside a wooden box, it can have high compressive strength and rigidity compared to the MARK Ⅲ type storage tank, and it is easy to weld and has high automation rate.

The MARK Ⅲ type storage tank has a primary sealing wall made of a 1.2mm thick stainless steel (SUS) membrane, a secondary sealing wall made of a triplex, and the upper or lower surface of a polyurethane foam. It includes primary and secondary insulation walls provided with insulation panels bonded with plywood plywood.

The primary sealing wall of the MARK III type storage tank has corrugated corrugations to absorb heat shrinkage caused by LNG in cryogenic conditions, and since these corrugated corrugations absorb the deformation of the membrane, there is no significant stress in the membrane.

However, in the MARK Ⅲ type storage tank, it is difficult to apply a corrugated stainless steel membrane for the secondary sealing wall because of the interference with the insulation walls arranged at the top and bottom, and the insulation panel that forms an insulation layer by a combination of polyurethane foam and plywood. Due to the characteristics of the NO 96 type storage tank, it is unreasonable to apply an Invar membrane with a small coefficient of heat shrinkage, so a triplex made of a composite material of glass cloth and aluminum foil is used instead of a metal membrane. This structure is NO 96 type. It has a disadvantage of lower stability than a storage tank.

In addition, the MARK Ⅲ type storage tank is disadvantageous in terms of installation/manufacturing due to low welding automation rate of the primary sealing wall with corrugation, but the cost of stainless steel membrane and triplex is cheaper than Invar membrane and construction is simple. Polyurethane foam is widely used with NO 96 type storage tanks because of its excellent insulation effect.

On the other hand, since the insulation box constituting the insulation wall of the NO 96 type storage tank is rigid, the lower insulation box is fixed to the hull using a fixing device.

However, since the insulation panel made of polyurethane foam has a more flexible structure than the insulation box, it is not easy to fix it to the hull using a fixing device. Therefore, in the conventional MARK Ⅲ type storage tank, the lower insulation panel is fixed to the hull by an adhesive method using a material called mastic.

In addition, the secondary sealing wall of the conventional MARK Ⅲ type storage tank uses a triplex instead of a metal membrane, and the upper and lower insulation panels are adhesively fixed through the triplex.

In such a conventional MARK Ⅲ type storage tank, since the insulation panel is fixed to the hull by an adhesive method, the local displacement due to the hull deformation is directly transmitted to the insulation panel, and accordingly, a local stress acts on the insulation panel.

In addition, the upper insulating panel constituting the primary insulating wall and the lower insulating panel constituting the secondary insulating wall are adhesively connected, so when an excessive sloshing load is applied, the adhesive surface is separated. There is a concern that the secondary sealing wall to prevent leakage of cryogenic LNG may be damaged or damaged.

The technical problem to be achieved by the present invention is to prevent the behavior or deformation of the hull from being transmitted to the insulating wall or the influence between the upper and lower insulating walls by fixing the insulating panel using a mechanical fastening method.

In order to achieve the above object, the present invention is a secondary insulation wall consisting of a plurality of secondary insulation panels fixed to the inner wall of the hull, and 1 consisting of a plurality of primary insulation panels fixed to the top of the secondary insulation panel. In the LNG storage tank having a double barrier structure including a secondary insulation wall, the secondary fixing device for fixing the secondary insulation panel to the inner wall of the hull, the lower end is fixed to the inner wall side of the hull, and the upper end is the upper end to store the LNG A coupler rod extending in the inner direction of the tank; A lower cleat formed to pass through a space in which the coupler rod is accommodated in the center and supported by a lower plate of the secondary insulating panel; A lower setting plate through which the coupler rod is inserted and supported by the lower cleat; A fixing nut fastened with the coupler rod to press the lower setting plate in a direction toward the inner wall of the hull; A lower spring washer interposed between the lower setting plate and the fixing nut; An intermediate cleat disposed on the lower setting plate; An intermediate setting plate supported by the intermediate cleat; An insulating block disposed on the intermediate setting plate; An upper setting plate supported by the insulating block; An upper fixing bolt penetrating the insulating block and fixing the intermediate setting plate and the upper setting plate to each other; And an upper spring washer interposed between the upper fixing bolt and the upper setting plate, providing an insulating panel fixing device for an LNG storage tank.

The insulation block may be made of a reinforced polyurethane foam (R-PUF) material.

The lower cleat and the intermediate cleat may be made of a wood material.

The lower setting plate, the intermediate setting plate, and the upper setting plate may be formed of a metal material.

The secondary fixing device may further include a lower fixing bolt penetrating the intermediate cleat and fixing the lower setting plate and the intermediate setting plate to each other.

Each corner of the secondary insulation panel is provided with a secondary fixing part for coupling with the secondary fixing device, and the corner parts of the four secondary insulation panels disposed adjacent to each other are simultaneously fixed in the secondary fixing device. Can be.

A portion of the secondary insulating panel where the secondary fixing part is formed is provided in a state in which the insulating material and the upper plate constituting the secondary insulating panel are removed and a portion of the lower plate is exposed, and the lower setting plates are adjacent to each other. It is possible to simultaneously press the exposed lower plates of the four secondary heat insulating panels arranged in such a way.

The lower cleat may have a lower surface bonded to the exposed lower plate of the secondary insulation panel by an adhesive, and an outer circumferential surface bonded to the insulation material constituting the secondary insulation panel by an adhesive.

The lower cleat is made of four divisions having the same cross-sectional area, and each of the divisions may be attached to a corner of the secondary insulation panel in the manufacturing step of the secondary insulation panel.

The intermediate cleat may be manufactured as an integral member.

The intermediate cleat may be formed such that a space accommodating the lower spring washer and the fixing nut penetrates at a center thereof.

The secondary fixing device may include an upper cleat made of wood disposed on the upper setting plate; And a steel strip member connecting the upper cleat and the upper plate of the secondary insulating panel.

The strip member may be simultaneously fixed to a step portion formed on a corner side of the secondary insulation panel and an upper surface of the upper cleat.

In addition, in another aspect of the present invention for achieving the above object, in the LNG storage tank of a double barrier structure in which a secondary insulation panel and a primary insulation panel are sequentially stacked on an inner wall of a ship, the secondary insulation panel is The secondary fixing device fixed to the inner wall of the hull includes: a lower setting plate coupled with a coupler rod fixed to the inner wall of the hull to press the lower plate of the secondary insulation panel; An intermediate setting plate disposed above the lower setting plate and fixed to each other by the lower setting plate and the lower fixing bolt; It includes an upper setting plate disposed on the upper side of the intermediate setting plate and fixed to each other by the intermediate setting plate and the upper fixing bolt, between the lower plate and the lower setting plate of the secondary insulation panel, and the lower setting plate A cleat made of wood material is disposed between the intermediate setting plates to be supported, and an insulating block made of reinforced polyurethane foam is disposed between the intermediate setting plate and the upper setting plate to be supported. It provides a device for fixing the insulation panel of the LNG storage tank as characterized.

Further comprising a fixing nut that is fastened with the coupler rod to press the lower setting plate in a direction toward the inner wall of the hull, and between the lower setting plate and the fixing nut, and between the upper setting plate and the upper fixing bolt, respectively It can have a double spring washer structure through a spring washer.

The secondary insulation panel is supported by a mastic or resin on the inner wall of the hull, but the mastic or resin is a kraft paper and the secondary insulation panel disposed on the inner wall of the hull It is applied between, the secondary insulation panel may be supported in a non-adhesive manner on the inner wall of the hull.

In the present invention, the fixing between the secondary insulation wall and the hull and the fixing between the primary insulation wall and the secondary insulation wall are made by a mechanical fastening method, and by making the secondary insulation wall supported by the inner wall of the hull in a non-adhesive manner, There is an effect of effectively preventing a behavior or deformation from being transmitted to the primary and secondary insulating walls, or from transmitting an influence between the primary and secondary insulating walls.

In addition, in the present invention, since the fixing device for fixing the primary insulation panel and the fixing device for fixing the secondary insulation panel are separated from each other, it is possible to reduce the amount of heat intrusion transferred from the hull to the storage tank by the fixing device, There is an effect of reducing the amount of boil-off gas generated in the storage tank.

In addition, the LNG storage tank according to the present invention has the effect of preventing local deformation due to the deformation of the hull from being absorbed by the spring washer under the secondary fixing device to prevent the behavior or deformation of the hull from being transmitted to the secondary insulating wall. , Since the load generated in the storage tank such as heat shrinkage and sloshing of the insulation panel by cryogenic LNG is absorbed by the upper spring washer and insulation block of the secondary fixing device, when deformation occurs in the secondary insulation panel, the secondary fixing device and Since there is an effect of preventing deformation of the secondary sealing wall due to the interaction of the secondary sealing wall, even if damage to the primary sealing wall occurs due to a specific accident, the secondary sealing wall can be maintained firmly.

On the other hand, even if it is an effect not explicitly mentioned herein, it is added that the effect described in the following specification and its provisional effect expected by the technical features of the present invention are treated as described in the specification.

1 is a diagram schematically showing a stacked structure of an insulation system constituting an LNG storage tank according to the present invention.
2 is a view showing a secondary insulation panel of the LNG storage tank according to the present invention.
3 is a view showing the primary insulation panel of the LNG storage tank according to the present invention.
4 is a view showing an embodiment in which the length and width of the primary and secondary insulation panels are provided in a 1:1 ratio in the LNG storage tank according to the present invention.
5 is a view showing an embodiment in which the length and width of the primary and secondary insulation panels are provided in a ratio of 1:2 in the LNG storage tank according to the present invention.
6 is a view showing that the secondary insulation panel is fixed to the inner wall of the hull by the secondary fixing device according to the present invention.
Figure 7 is a side view of the secondary fixing device according to the present invention, (a) shows a structure including all the components, (b) shows a structure in which the intermediate cleat and the insulating block are omitted.
8 is a view showing the coupling relationship between the components constituting the secondary fixing device according to the present invention.
9 is a view sequentially showing the installation sequence of the secondary fixing device according to the present invention.
10 is a view showing that the first insulating panel is fixed to the upper portion of the second insulating panel by the first fixing device according to the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the implementation of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in detail by describing a preferred embodiment of the present invention with reference to the accompanying drawings. The same reference numerals shown in each drawing indicate the same members.

In the present invention, the use of the terms'primary' and'secondary' refers to whether the LNG is primarily sealed or insulated based on the LNG stored in the storage tank, or the secondary is sealed or insulated. It was used as a classification standard for whether or not.

Also, by convention, the terms'upper' or'up' applied to an element of a tank refer to a direction toward the inside of the tank, regardless of the direction to gravity, and likewise, the term'lower' or'down' refers to gravity. Regardless of the direction, it refers to the direction toward the outside of the tank.

1 is a view schematically showing the stacked structure of the insulation system constituting the LNG storage tank according to the present invention, Figure 2 is a view showing the secondary insulation panel of the LNG storage tank according to the present invention, Figure 3 is the present invention It is a view showing the primary insulation panel of the LNG storage tank according to.

1 to 3, the LNG storage tank according to the present invention includes a secondary insulation wall 100 made of a plurality of secondary insulation panels 110 arranged on the inner wall of the hull H, and the secondary A primary insulation wall 300 comprising a secondary sealing wall 200 installed on the insulation wall 100 and a plurality of primary insulation panels 310 arranged on the secondary sealing wall 200, 1 It is provided in a double barrier structure in which the primary sealing walls 400 installed on the primary insulating wall 300 are sequentially stacked.

The primary insulation panel 310 is manufactured as a unit panel in the form of a hexahedron or more polyhedron, and a plurality of primary insulation panels 310 are arranged on the secondary sealing wall 200 in the transverse and longitudinal directions, The insulating wall 300 may be formed.

The secondary insulation panel 110 is also manufactured as a unit panel in the form of a hexahedron or higher polyhedron, and a plurality of secondary insulation panels 110 are arranged in the transverse and longitudinal directions on the inner wall of the hull H to provide secondary insulation. Wall 100 can be formed.

The primary and secondary insulation panels 310 and 110 are sandwiches in which plates are attached to the upper, lower, or both upper and lower surfaces of an insulating material such as polyurethane foam (PUF) or reinforced polyurethane foam (R-PUF). It can be provided as a sandwich panel. The plate serves to impart mechanical rigidity to the insulation panels 310 and 110, and may be made of a composite material such as plywood or glass reinforced plastic (GRP).

The secondary insulation wall 100 may be fixed by a secondary fixing device 600 (see FIGS. 6 to 9) provided on the inner wall of the hull H, and the primary insulation wall 300 is a secondary insulation wall 100 ) In close contact with the upper portion of the secondary sealing wall 200 by the primary fixing device 500 provided on the upper portion of the secondary insulating panel 110 with the secondary sealing wall 200 interposed therebetween. Can be fixed.

The primary and secondary sealing walls 400 and 200 may be formed of a metal membrane.

The primary and secondary sealing walls 400 and 200 may be formed by selectively employing any one of various metal materials strong in low temperature brittleness, such as Invar, stainless steel (SUS), aluminum alloy, etc. It may include both flat or corrugated metal membranes.

In the present invention, as a preferred embodiment, the primary sealing wall 400 is made of a corrugation membrane made of stainless steel, and the secondary sealing wall 200 is LNG made of a flat membrane made of Invar material. Provide storage tanks.

The primary sealing wall 400 is to be sealed by direct contact with LNG, and may be provided with a stainless steel membrane including a plurality of corrugated corrugations formed in the inner direction of the storage tank to absorb shrinkage due to cryogenic temperatures.

The primary sealing wall 400 may be formed of a plurality of unit membranes having a size corresponding to that of the unit panel of the primary insulation panel 310, and a plurality of unit membranes are provided on the top of the primary insulation panel 310. It can be installed on the upper part of the primary heat insulating wall 300 by welding to the anchor strip 316 without gap.

The secondary sealing wall 200 may be formed of a flat invar membrane. Specifically, a metal plate referred to as an invar strake is continuously welded to a tongue member installed on the upper portion of the secondary insulating panel 110, thereby forming the upper portion of the secondary insulating wall 100. Can be installed.

A through hole may be formed in the secondary sealing wall 200 so that a stud included in the primary fixing device 500 provided on the secondary insulating panel 110 passes through.

The LNG storage tank according to the present invention has a structure in which the secondary insulation panel 110 and the primary insulation panel 310 disposed thereon are intersected with each other.

The upper and lower thermal insulation panels, that is, the cross-arrangement between the primary thermal insulation panel 310 and the secondary thermal insulation panel 110, is formed on the side of the primary thermal insulation wall 300 and the secondary thermal insulation wall 100. This is to reduce the convection action inside the heat insulating layer and improve the heat insulating performance of the storage tank by preventing the gaps formed from being connected to each other.

In addition, the stability of the support structure of the insulation wall is improved through the cross-arrangement between the primary insulation panel 310 and the secondary insulation panel 110, and accordingly, a metal membrane is used as the sealing walls 400 and 200. It becomes possible.

Hereinafter, with continued reference to FIGS. 1 to 3, a more detailed look at the structure of the primary and secondary insulation panels 310 and 110 for cross-arrangement of the primary insulation panel 310 and the secondary insulation panel 110 Let's see.

The primary and secondary thermal insulation panels 310 and 110 may be manufactured as unit panels having a hexahedral shape in which a length is an integer multiple of a width. Hereinafter, it will be described as a preferred embodiment of the present invention that the width and length of the insulation panels 310 and 110 are provided in a ratio of 1:3, more preferably in a size of approximately 1m×3m.

First, referring to FIG. 2, the secondary insulation panel 110 is a plate 112 made of plywood or a composite material on the top, bottom, or both of the top, bottom, or top and bottom of the secondary insulation 111 made of polyurethane foam or reinforced polyurethane foam. 113) may be provided as a bonded sandwich panel.

A secondary fixing part (S2) for coupling with a secondary fixing device (600: see FIGS. 6 to 9) provided on the inner wall of the hull (H) is provided at the edge vertical corners including the four corners of the secondary insulation panel 110. It is prepared. In the drawing, it is shown that the secondary fixing parts S2 are arranged at 1m intervals so that eight secondary fixing parts S2 are provided in one secondary insulation panel 110, but the secondary insulation panel 110 The secondary fixing part S2 may be provided only at the four corners. That is, the secondary fixing part S2 is always provided at the four corners of the secondary insulation panel 110, and the remaining secondary fixing part S2 may be selectively applied as needed.

The secondary fixing part (S2) provided at the corner of the secondary insulation panel 110 is a groove having a fan shape in cross section, and the secondary fixing part (S2) provided at the remaining parts except for the four corners has a semicircle in cross section. It may be provided as a groove having a shape. However, the present invention is not limited thereto, and any shape may be provided as long as it is a structure that is easy to accommodate the configurations of the secondary fixing device 600 to be described later.

A portion of the secondary insulating panel 110 where the secondary fixing part S2 is formed is provided in a state in which the upper plate 112 and the secondary insulating material 111 are removed and the lower plate 113 is exposed.

To fix the secondary insulation panel 110 and the hull (H), a coupler rod included in the secondary fixing device 600 is inserted into the secondary fixing part (S2) and fastening a fixing nut, etc. It may be made by pressing the lower plate 113 of the top (S2).

The secondary insulation panel 110 is provided with a primary fixing device 500 for coupling with the primary insulation panel 310. At this time, the first fixing device 500 may be disposed inside the edge from the top of the second insulating panel 110.

More preferably, as shown in FIG. 2, one primary fixing device 500 is disposed in the middle of the secondary insulating panel 110, and front and rear from the primary fixing device 500 disposed in the center. As such, the remaining primary fixing devices 500 may be disposed at positions spaced apart by the same distance along the longitudinal direction of the panel.

The distance (d) from the primary fixing device 500 disposed in the middle of the secondary insulation panel 110 to the primary fixing device 500 disposed to be spaced forward and rearward is, the secondary insulation panel 110 It can be arranged to be twice the distance (1/2d) from the longitudinal edge of the adjacent primary fixing device 500.

The primary fixing device 500 may be disposed on the center line C in the width direction on the secondary insulating panel 110. Therefore, since the secondary heat insulating panel 110 receives the same degree of thermal stress from both sides of the primary fixing device 500 disposed at the center in the width direction, the primary fixing device 500 by the stress acting on the panel Is minimized to be displaced in the width direction.

In addition, a slit 114 may be formed on the secondary insulating panel 110 at a position spaced apart by the same distance in front and rear of each of the primary fixing devices 500. Since the primary fixing device 500 disposed between the pair of slits 114 receives the same amount of stress from both sides, the primary fixing device 500 is displaced in the longitudinal direction by the stress acting on the panel. Is minimized. The spacing between the slits 114 formed on the secondary insulating panel 110 may be uniformly formed.

Next, referring to FIG. 3, the primary insulation panel 310 is a plate 312 made of plywood or a composite material on the top, bottom, or both of the top, bottom, or top and bottom of the primary insulation 311 made of polyurethane foam or reinforced polyurethane foam. , 313) may be provided as a bonded sandwich panel.

A primary fixing part S1 for coupling with the secondary insulation panel 110 is provided at the edge of the vertical edge including the four corners of the primary insulation panel 310. The primary fixing parts S1 may be disposed at equal intervals along the circumference of the primary insulating panel 310. In the drawing, it is shown that the primary fixing parts S1 are arranged at 1m intervals so that eight primary fixing parts S1 are provided on one primary insulating panel 310.

The primary fixing part S1 may be provided as a groove having a semicircle or fan shape in cross section. However, the present invention is not limited thereto, and any form may be provided as long as it is a structure that is easy to accommodate the configurations of the primary fixing device 500 to be described later.

In the portion of the first heat insulating panel 310 where the first fixing portion S1 is formed, the upper plate 312 and the second heat insulating material 311 are removed, and the lower plate 313 is exposed.

The fixing between the primary insulation panel 310 and the secondary insulation panel 110 is performed by fastening a fixing nut or the like while the studs included in the primary fixing device 500 are inserted into the primary fixing part S1. It may be achieved by pressing the lower plate 313 of the primary fixing portion (S1).

The structure in which the secondary insulation panel 110 is fixed to the inner wall of the hull H by the coupling between the secondary fixing device 600 and the secondary fixing part S2, and the primary fixing device 500 and the primary fixing part The structure in which the primary insulation panel 310 is fixed to the upper portion of the secondary insulation panel 110 by the coupling between (S1) will be described in more detail later with reference to FIGS. 6 to 10.

Referring to FIG. 1 again, the primary insulation panel 310 may be disposed to be displaced from the secondary insulation panel 110 so that the corner is placed in the center of the secondary insulation panel 110, and thus one primary insulation The panel 310 is disposed so as to span the upper surfaces of the four secondary insulating panels 110 disposed below.

In the present invention, three primary fixing devices 500 are provided on the upper part of the secondary insulation panel 110, and 8 primary fixing parts S1 are provided at the vertical corners of the primary insulation panel 310. It is presented as a preferred embodiment.

According to this embodiment, in the primary fixing device 500 disposed in the center of the secondary insulation panel 110, the primary fixing portions S1 provided on the four primary insulation panels 310 are simultaneously fixed, In the primary fixing device 500 disposed to be spaced apart from the secondary insulation panel 110 to the center, the primary fixing portions S1 provided on the two primary insulation panels 310 are simultaneously fixed.

That is, two or more primary insulation panels 310 disposed adjacent to each other may share the primary fixing device 500 disposed therebetween, and in this embodiment, three or more secondary insulation panels 110 Just by providing the primary fixing device 500, it is possible to secure as much as 8 points of support points of the primary insulating panel 310.

On the other hand, in the present invention, since the distance (d) between the neighboring primary fixing devices 500 is 1/3 of the length of the secondary insulation panel 110, the width in the width direction of the secondary insulation panel 110 It can be seen that they are provided with the same length (1m) (there may be installation tolerances).

Accordingly, on the top of the secondary insulation wall 100 made by the secondary insulation panels 110 arranged along the transverse and longitudinal directions of the storage tank, a plurality of primary fixing devices 500 are provided at a unit interval (d) It is arranged in a grid with 1 m. That is, it can be understood that a plurality of primary fixing devices 500 are arranged in a tiled manner so as to have the same unit spacing (d) on the upper portion of the secondary insulating wall 100.

At this time, the size of the secondary insulation panel 110 is not limited to a 1:3 ratio. As described above, the secondary insulation panel 110 may be provided as a unit panel in the form of a hexahedron having an integer multiple of the width. For example, when the secondary insulation panel 110 is provided as a 1:1 ratio panel, By providing one primary fixing device 500 on the upper portion of the secondary insulation panel 110, when the secondary insulation panel 110 is provided as a 1:2 ratio panel, the secondary insulation panel 110 ) By providing the two primary fixing devices 500 on the upper side, the primary fixing devices 500 on the secondary insulating wall 100 may be grid-arranged so as to have a constant unit interval (d). .

In addition, in the present invention, a panel having a ratio of 1:3 as the primary insulation panel 310 disposed on the secondary insulation panel 110 is described as a preferred embodiment, but the width of the secondary insulation panel 110 and Any size can be freely applied as long as the length is the same and has an integer multiple of the width. That is, the length of the first heat insulating panel 310 does not necessarily have to be the same as the length of the second heat insulating panel 110.

The present invention can be arranged using various sizes of insulation panels 310 and 110 according to the complexity of the internal area of the storage tank, so that the installation work of the LNG storage tank can be made very flexible.

4 shows an embodiment in which both the primary insulation panel 310 and the secondary insulation panel 110 are provided in a 1:1 ratio, and FIG. 5 shows both the primary insulation panel 310 and the secondary insulation panel 110 Examples provided in a 1:2 ratio are each shown.

In the embodiment shown in FIG. 4, as provided with one primary fixing device 500 on one secondary insulation panel 110, four points of support of the primary insulation panel 310 are secured, and shown in FIG. 5 In the above-described embodiment, six points of support of the primary insulating panel 310 are secured by providing two primary fixing devices 500 on one secondary insulating panel 110.

Therefore, the LNG storage tank according to the present invention is said to have the effect of improving the stability of the insulating wall support structure by ensuring that the support points of the first insulating panel 310 are maximized even with a small number of the first fixing devices 500. can do.

In addition, according to the present invention, as the first insulation panel 310 and the second insulation panel 110 are intersected, the gap formed between the first insulation panel 310 and the gap formed between the second insulation panel are not connected in a straight line. Therefore, there is an effect of improving the thermal insulation performance by reducing the convection action inside the thermal insulation layer.

Reference numeral 115 is an insertion groove into which the tongue to which the invar strike constituting the secondary sealing wall 200 is welded is inserted, and reference numeral 315 is a protrusion of the tongue inserted into the insertion groove 115 and It is a receiving groove for receiving the bent portion of the secondary sealing wall 200 to be welded.

In addition, reference numeral 314 denotes a slit formed in the transverse direction and the longitudinal direction while having a predetermined interval on the upper portion of the primary heat insulating panel 310 to disperse the concentration of stress due to heat contraction.

Hereinafter, in the present invention, a structure in which the fixing between the secondary insulating wall and the hull and the fixing between the primary insulating wall and the secondary insulating wall is performed will be sequentially described.

Figure 6 is a view showing that the secondary insulation panel is fixed to the inner wall of the hull by the secondary fixing device according to the present invention, Figure 7 is a side view of the secondary fixing device according to the present invention, Figure 8 is a secondary according to the present invention A view showing the coupling relationship between the components constituting the fixing device, and FIG. 9 is a view sequentially showing the installation sequence of the secondary fixing device according to the present invention.

Referring to FIG. 6, it can be seen that in the LNG storage tank according to the present invention, the secondary insulation panel 110 is fixed by a secondary fixing device 600 provided on the inner wall of the hull. For reference, the left figure in FIG. 6 shows the upper cleat and the strip member from among the configurations of the secondary fixing device 600 for convenience of explanation.

As can be seen from the drawing, the secondary insulation panels 110 disposed adjacent to each other may be installed to share the secondary fixing device 600 disposed therebetween. Specifically, four secondary insulation panels 110 adjacent to one of the secondary fixing devices 600 fixing the corners of the secondary insulation panel 110 may be simultaneously fixed.

In Figure 7 the detailed structure of the secondary fixing device 600 according to the present invention is better represented. For reference, a secondary fixing device 600 including all configurations is shown in (a) of FIG. 7, and an intermediate cleat 632 and an insulating block 680 are provided for convenience of description in FIG. 7 (b). The omitted secondary fixing device 600 is shown.

Referring to Figure 7, the secondary fixing device 600 according to the present invention, a coupler base socket 610 installed on the inner wall of the hull; A coupler rod 620 whose lower end is fixed to the coupler base socket 610 and the upper end extends in the inner direction of the storage tank; A lower cleat 631 formed inside a space in which the coupler rod 620 is accommodated and supported by the exposed upper surface of the lower plate 113 of the secondary insulation panel 110; A lower setting plate 641 through which the coupler rod 620 is inserted and supported by the lower cleat 631; A fixing nut 660 that is fastened to the upper end of the coupler rod 620 and presses the lower setting plate 641 toward the inner wall of the ship body; An intermediate cleat 632 disposed on the lower setting plate 641; An intermediate setting plate 642 supported by an intermediate cleat 632; An insulating block 680 disposed on the intermediate setting plate 642; An upper setting plate 643 supported by the heat insulating block 680; And it includes an upper cleat 633 disposed on the upper setting plate 643.

The coupler base socket 610 may be installed on the inner wall of the hull by welding.

The coupler rod 620 is a space formed by a secondary fixing portion (S2) provided at the lower end portion is fixed to the coupler base socket 610 by bolt/nut fastening, and the upper end portion is provided on the secondary insulating panel 110 It protrudes.

The lower cleat 631 is installed to be supported on the upper surface of the lower plate 113 of the secondary fixing part S2. Here, the lower plate 113 of the secondary fixing portion S2 means a portion of the lower plate 113 of the secondary insulating panel 110 exposed by the formation of the secondary fixing portion S2.

The lower cleat 631 may be attached to the secondary fixing portion S2 formed at the corner of the secondary insulating panel 110. Specifically, the lower surface of the lower cleat 631 is connected by bonding to the lower plate 113 of the secondary fixing part S2, and the outer circumferential surface is formed to be rounded by the formation of the secondary fixing part S2. It may be bonded to the secondary insulation 111 of the insulation panel 110.

In the present invention, if the lower setting plate 641 directly touches the lower plate 113 of the secondary insulation panel 110, there is a risk of damage to the lower plate 113 when the panel is compressed by a sloshing load, etc. A lower cleat 631 made of wood is placed between the plate 641 and the lower plate 113 to protect the lower plate 113 of the secondary insulating panel 110.

A space capable of accommodating the coupler rod 620 and the coupler base socket 610 as necessary may be provided at the center of the lower cleat 631 to penetrate.

The lower setting plate 641 may be provided as a disk-shaped metal plate in which a hole through which the coupler rod 620 is inserted is formed, and is inserted into the coupler rod 620 and supported on the upper surface of the lower cleat 631.

The fixing nut 660 is coupled to the coupler rod 620 by a bolt/nut fastening method, and by pressing the lower setting plate 641 while the lower spring washer 651 is interposed between the lower setting plate 641 , The secondary insulation panel 110 may be firmly fixed to the inner wall of the hull.

At this time, the lower setting plate 641 pressurized by the fixing nut 660 simultaneously presses the lower plate 113 of the secondary insulation panel 110 disposed adjacent to each other, so that one secondary fixing device 600 is applied to the lower setting plate 641. By this, two or more secondary insulating panels 110 adjacent to each other may be fixed at the same time.

A lower spring washer 651 may be interposed between the lower setting plate 641 and the fixing nut 660. The lower spring washer 651 serves to reduce the influence transmitted from the hull to the secondary insulation panel 110 to reduce the load acting on the secondary insulation panel 110.

An intermediate cleat 632, an intermediate setting plate 642, an insulating block 680, an upper setting plate 643 and an upper cleat 633 are sequentially disposed on the lower setting plate 641.

Like the lower cleat 631, the middle cleat 632 and the upper cleat 633 may be manufactured using a wood material. The use of wood material as the cleats (631, 632, 633) is because it is more advantageous than a metal material in preventing heat penetration.

A space accommodating the lower spring washer 651 and the fixing nut 660 may be formed at the center of the intermediate cleat 632 to penetrate.

Like the lower setting plate 641, the intermediate setting plate 642 and the upper setting plate 643 may be provided with a disc-shaped metal plate.

In the secondary fixing device 600 according to the present invention, the lower setting plate 641, the intermediate cleat 632 and the intermediate setting plate 642 may be fixed by the lower fixing bolt 671, and the intermediate setting plate ( 642), the insulation block 680, and the upper setting plate 643 may be fixed by the upper fixing bolt 672.

The coupling relationship of the components by the lower fixing bolt 671 and the upper fixing bolt 672 is well shown in FIG.

8, in the combination of the lower setting plate 641-the intermediate cleat 632-the intermediate setting plate 642, the upper surface of the lower setting plate 641 disposed at the bottom of the lower fixing bolt 671 A first fastening hole (a1) (or fastening groove) having a threaded line may be formed so that the lower end may be fastened. In addition, in the intermediate cleat 632 disposed in the middle, a first through hole a2 through which the lower fixing bolt 671 can penetrate may be formed at a position corresponding to the first fastening hole a1, and the intermediate setting The plate 642 may include a hole through which the body of the lower fixing bolt 671 passes, but a first receiving groove a3 for receiving and supporting the head of the lower fixing bolt 671 may be formed.

Similarly, in the combination of the intermediate setting plate 642-the insulation block 680-the upper setting plate 643, the lower end of the upper fixing bolt 672 is fastened to the upper surface of the intermediate setting plate 642 disposed at the bottom. A second fastening hole (b1) (or fastening groove) having a threaded line may be formed, and a second through hole through which the upper fixing bolt 672 may pass through the heat insulating block 680 disposed in the middle ( b2) may be formed at a position corresponding to the second fastening hole b1, and the upper setting plate 643 includes a hole through which the body of the upper fixing bolt 672 passes, but the head of the upper fixing bolt 672 A second accommodation groove b3 for receiving and supporting the portion may be formed.

The head of the upper fixing bolt 672 may be supported by the bottom surface of the second receiving groove (b3), at this time, between the head of the upper fixing bolt 672 and the bottom surface of the second receiving groove (b3) The upper spring washer 652 may be interposed.

When the upper spring washer 652 is deformed by the load generated in the storage tank such as heat contraction and sloshing of the insulation panel by cryogenic LNG, the secondary insulation panel 110 and the It serves to absorb the occurrence of deformation in the secondary sealing wall 200 by the interaction with the secondary fixing device 600.

The insulation block 680 may be provided in a cylindrical shape, and may be made of a reinforced polyurethane foam (R-PUF) material to have some elasticity.

In the present invention, external force (deformation of the hull) acting from the lower portion of the secondary insulation panel 110 can be easily absorbed by the above-described lower spring washer 651, which acts from the top of the secondary insulation panel 110. It is difficult to absorb the load (deformation due to heat shrinkage, sloshing, etc.) only with the upper spring washer 652.

Accordingly, the present invention puts an insulation block 680 made of a reinforced polyurethane foam (R-PUF) material between the intermediate setting plate 642 and the upper setting plate 643, and the upper part of the secondary insulation panel 110 It is designed to flexibly respond to the load acting from

Cleats (631, 632, 633), setting plates (641, 642, 643) and insulation block (680) constituting the secondary fixing device 600 according to the present invention, the secondary fixing device 600 It may be provided as a member having a circular cross section so that it can be appropriately inserted into a space formed by two or more secondary fixing portions S2 disposed to face each other. However, it goes without saying that if the cross section of the secondary fixing part S2 is provided in a shape other than a fan shape or a semicircle, it may be provided in a different shape corresponding thereto.

Here, the setting plates 641, 642, 643 uniformly press the corners of two or more secondary insulation panels 110 disposed around one secondary fixing device 600, or a secondary insulation panel As a member that functions to uniformly support the load applied to the corner portion of (110), it is preferable to be provided as an integral member.

On the other hand, the cleats 631, 632, 633 may be integrally manufactured with a member having a cylindrical shape as a whole, or may be divided into two or more divided bodies having the same cross-sectional area. We need to look at which way it is better to make it.

As described above, the lower cleat 631 is bonded to the corner of the secondary insulating panel 110, and the present invention is a manufacturing step of the lower cleat 631 for the convenience of work. It can be attached to the corner of the secondary insulation panel (110).

At this time, if the lower cleat 631 is fabricated into four divided bodies having a fan-shaped cross section to correspond to the shape of the exposed lower plate 113 of the secondary fixing part S2, the manufacturing step of the secondary insulation panel 110 Since it is possible to directly attach the divided pieces to the corner of the panel and receive the delivery, there is an advantage that the difficulty of the operation is very low.

That is, the lower cleat 631 included in the secondary fixing device 600 for fixing the corner portion of the secondary insulation panel 110 in the present invention is divided into four divisions having a sector-shaped cross section having a central angle of 90°. It is preferable to be divided and manufactured, and the secondary insulation panel 110 may be attached to the panel before being fixed to the hull.

However, the present invention is not limited thereto, and the lower cleat 631 is provided as two divided bodies having a semicircular cross section or an integral member having a circular cross section, and the secondary insulation panel 110 is provided on the inner wall of the hull. In the process of fixing to the second fixing device 600, a method of inserting two divided bodies or lower cleats 631 provided integrally in a space formed by two or more secondary fixing parts S2 disposed around the secondary fixing device 600 Of course it is possible.

Since a space for accommodating the coupler base socket 610 and the coupler rod 620 must be provided at the center of the lower cleat 631, in the case where the lower cleat 631 is provided as an integral type, a hole in the center of the cleat 630 ( hole) may be formed, and when the lower cleat 631 is provided with two or more divided bodies, a rounded cut-out groove may be formed in a central portion of each divided body.

When the lower cleat 631 is provided with two or more divided bodies, a space between the adjacent divided bodies may be filled with an insulating material such as glass wool to insulate it.

In contrast, the intermediate cleat 632 is preferably provided as an integral member. In the case of the intermediate cleat 632, since it is not a base-attached structure, there is no practical advantage to be manufactured as a divided body, and it is better to be provided as an integral type in order to prevent heat intrusion.

The upper cleat 633 is preferably divided into two or more divided bodies like the lower cleat 631 in consideration of the convenience of installation of the strip member 690 to be described later. However, since the upper cleat 633 is also not a base-attached structure to the panel, it may not be considered that the actual benefit of the division production is as large as that of the lower cleat 631.

Secondary fixing device 600 according to the present invention, for solid support of the upper cleat 633 disposed on the upper setting plate 643, the upper cleat 633 and the upper portion of the secondary insulation panel 110 A strip member 690 connecting the plates 112 may be further included.

The strip member 690 is made of steel, and the upper part of the upper plate 112 and the upper cleat 633 of the secondary insulating panel 110 are covered at the corner side of the secondary insulating panel 110. Can be installed on.

For the arrangement of the strip member 690, the upper plate 112 on the corner side of the secondary insulation panel 110 may be formed to be stepped by the thickness of the strip member 690, and the end on which the strip member 690 is mounted. The vehicle surface forms the same plane as the upper surface of the upper cleat 633.

The strip member 690 is disposed to cover the stepped surface formed at the corner of the secondary insulation panel 110 and the upper surface of the upper cleat 633 at the same time, and the top surface of the strip member 690 having the arrangement completed is a secondary insulation panel ( 110) and the same plane.

The strip member 690 may be simultaneously fixed to the upper plate 112 and the upper cleat 633 of the secondary insulating panel 100 using an adhesive and a screw. The strip member 690 may have a plurality of fastening holes for fastening members such as screws.

9 shows a sequential process in which the secondary fixing device 600 according to the present invention is installed.

Referring to Figure 9 to describe a method of fixing the secondary insulation panel 110 using the secondary fixing device 600 according to the present invention, first, the secondary fixing part S2 is located around the coupler base socket 610 The secondary insulation panel 110 is disposed on the inner wall of the hull so as to be performed. At this time, the lower cleat 631 is attached to the secondary fixing portion S2.

Next, the coupler rod 620 is fastened to the coupler base socket 610, and after sequentially inserting the lower setting plate 641 and the lower spring washer 651 to the fixed coupler rod 620, the lower setting plate 641 ) By fastening the fixing nut 660 to the upper end of the coupler rod 620 so that it is pressed in the direction toward the inner wall of the hull, thereby fixing the secondary insulation panel 110 to the inner wall of the hull.

After the fixing nut 660 is fastened, the intermediate cleat 632 and the intermediate setting plate 642 are placed on the upper surface of the lower setting plate 641, and the lower setting plate (not shown in FIG. 9) 641), the intermediate cleat 632 and the intermediate setting plate 642 are fixed to each other.

Next, the heat insulating block 680 and the upper setting plate 643 are arranged on the upper surface of the intermediate setting plate 642, and the intermediate setting plate 642, the insulating block 680 and the upper part by the upper fixing bolt 672 The setting plates 643 are fixed to each other. At this time, an upper spring washer (not shown in FIG. 9) may be interposed between the head of the upper fixing bolt 672 and the upper setting plate 643.

Finally, after placing the upper cleat 633 on the upper setting plate 643, a strip member 690 that simultaneously covers the upper plate 112 and the upper cleat 633 of the secondary insulation panel 110 Install. At this time, the strip member 690 may be simultaneously fixed to the stepped surface formed on the upper plate 112 and the upper surface of the upper cleat 633 using an adhesive and a screw.

In the present invention, since local deformation due to hull deformation is absorbed by the lower spring washer 651 of the secondary fixing device 600, the effect of preventing the behavior or deformation of the hull from being transmitted to the secondary insulating wall 100 There is.

In addition, in the present invention, since the load generated in the storage tank such as heat shrinkage and sloshing of the insulation panel by cryogenic LNG is absorbed by the upper spring washer and the insulation block 680 of the secondary fixing device 600, the secondary There is an effect of preventing deformation in the secondary sealing wall 200 due to interaction with the secondary fixing device 600 when deformation occurs in the insulation panel 110.

Therefore, according to the present invention, even if damage to the primary sealing wall 400 occurs due to a specific accident, the secondary sealing wall 200 can be firmly maintained.

On the other hand, the secondary insulation panel 110 constituting the secondary insulation wall 100 in the LNG storage tank according to the present invention may be supported by a mastic or resin on the inner wall of the hull. The lower insulation panel and the hull are not directly joined by mastic like the MARK Ⅲ type storage tank of the present invention, but the present invention lays kraft paper (not shown) on the inner wall of the hull, and the kraft paper and the secondary insulation panel ( 110) can be applied to a method of applying mastic or resin.

That is, in the present invention, the secondary insulation panel 110 is separated from the inner wall of the hull by kraft paper (supported in a non-adhesive manner) to avoid direct influence due to the behavior or deformation of the hull, and accordingly, the behavior or deformation of the hull Transmission to the secondary insulating wall can be prevented more effectively.

10 is a view showing that the first insulating panel is fixed to the upper portion of the second insulating panel by the first fixing device according to the present invention.

In the present invention, it has been described above that the adjacent primary insulating panels 310 can be installed to share the primary fixing devices 500 disposed therebetween.

Referring to FIG. 10, the primary fixing device 500 according to the present invention includes a base socket 510 installed on the upper portion of the secondary insulation panel 110, and is screwed to the base socket 510 and has an upper end of 2 Studs 520 protruding to the top of the primary insulation panel 110, and the studs 520 are inserted through the setting plate 530 supported by the exposed upper surface of the lower plate 313 of the primary insulation panel 310 ), a fixing nut 540 that is fastened to the upper end of the stud 520 to press the setting plate 530, and a spring washer 550 interposed between the setting plate 530 and the fixing nut 540.

The base socket 510 includes a socket body 511 constituting a body, a groove formed on the upper portion of the secondary insulating material 111 and the upper portion of the secondary insulating panel 110 provided to protrude around the lower circumference of the socket body 511 It includes a socket flange 512 inserted into the space formed between the plates 112.

The base socket 510 may be seated in a groove formed on the upper portion of the secondary heat insulating material 111 and fixed by bonding.

The upper surface of the socket body 511 may form the same plane as the upper surface of the upper plate 112 of the secondary insulation panel 110, and the upper surface of the socket flange 512 is the same plane as the upper surface of the secondary insulating material 111 Can be achieved. That is, as shown in the drawing, the base socket 510 may be provided in a form in which the cross section is stepped by the socket body 511 and the socket flange 512.

The socket flange 512 is inserted into the space formed between the groove formed in the secondary insulating material 111 and the upper plate 112 of the secondary insulating panel 110 so that the upper surface supports the end of the upper plate 112 .

The stud 520 may be a collar stud including a wing portion 521. The secondary sealing wall 200 is connected to the end of the wing portion 521 by welding, and at this time, the end of the wing portion 521 is positioned within the upper surface of the socket body 511, so that the wing portion 521 and the secondary By allowing the sealing wall 200 to be welded on the upper surface of the socket body 511, it is possible to prevent burn damage to the upper plate 112 of the secondary insulating panel 110 during welding. .

The setting plate 530 may be provided in the form of a disk in which a hole through which the stud 520 is inserted is formed, and the first fixing part S1 provided on the primary insulation panel 310 by being inserted into the stud 520 It is supported on the upper surface of the lower plate 313. Here, the lower plate 313 of the primary fixing portion S1 means a portion of the lower plate 313 of the primary insulating panel 310 exposed by the formation of the primary fixing portion S1.

At this time, the setting plate 530 simultaneously presses the lower plate 313 of the primary insulation panel 310 disposed adjacent to each other, so that two or more primary insulation panels adjacent to each other in one primary fixing device 500 ( 310) can be fixed at the same time.

The fixing nut 540 is coupled with the stud 520 by a bolt/nut fastening method, and by pressing the setting plate 530 with the spring washer 550 interposed between the setting plate 530, primary insulation The panel 310 may be firmly fixed to the top of the secondary insulating panel 110.

The spring washer 550 serves to reduce the impact transmitted from the secondary insulation panel 110 to the primary insulation panel 310 to reduce the load acting on the primary insulation panel 310. In the present invention, the lower and upper spring washers of the secondary fixing device 600 as described above, as well as the spring washers 550 of the primary fixing device 500, reduce the load in a double or triple structure.

In the empty space remaining in the primary fixing part S1 after the coupling between the primary fixing device 500 and the primary fixing part S1 is made, the insulation function is performed while maintaining the integrity of the membrane on the upper part of the space. A heat insulating member (not shown) can be filled. The heat insulating member (not shown) may be provided as a reinforced polyurethane foam similar to the second heat insulating member 670 or may be provided as a composite of plywood and polyurethane foam.

As described above, in the LNG storage tank according to the present invention, fixing between the secondary insulating wall and the hull and fixing between the primary insulating wall and the secondary insulating wall are made by a mechanical fastening method.

In addition, unlike the conventional MARK Ⅲ type storage tank, the LNG storage tank according to the present invention can provide a secondary sealing wall with a metal membrane, and the fixing between the primary and secondary insulation walls is not adhesive, but mechanical. The effect is also effectively prevented from being transmitted between the insulating walls by using a fastening method.

Therefore, the present invention has the effect of reducing the stress acting on the metal membrane of the heat insulating panel and the secondary sealing wall due to local deformation caused by the hull deformation.

In addition, in the present invention, since the fixing device for fixing the primary insulation panel and the fixing device for fixing the secondary insulation panel are separated from each other in the LNG storage tank, the amount of heat intrusion transferred from the hull to the storage tank by the fixing device is reduced. It can be reduced, there is an effect of reducing the amount of boil-off gas (BOG) generated in the storage tank compared to other conventional insulation systems.

In addition, in the LNG storage tank according to the present invention, the secondary insulating wall is separated from the inner wall of the hull by kraft paper to avoid direct influence due to the behavior or deformation of the hull, and the lower and upper spring washers provided in the secondary fixing device and 1 Since the load reduction is double or tripled by the spring washers provided in the vehicle fixing device, it is possible to effectively prevent the behavior or deformation of the hull from being transmitted to the insulating wall.

It is apparent to those of ordinary skill in the art that the present invention is not limited to the disclosed embodiments, and that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the scope of the claims of the present invention.

100: secondary insulation wall
110: secondary insulation panel 111: secondary insulation
112: upper plate 113: lower plate
200: secondary sealing wall
300: primary insulating wall
310: primary insulation panel 311: primary insulation
312: upper plate 313: lower plate
400: primary sealing wall
500: primary fixing device
510: base socket
520: stud
530: setting plate
540: fixing nut
550: spring washer
600: secondary fixing device
610: coupler base socket
620: coupler rod
631: lower cleat 632: middle cleat
633: upper cleat
641: lower setting plate 642: middle setting plate
643: upper setting plate
651: lower spring washer
660: fixing nut
671: lower fixing bolt 672: upper fixing bolt
680: insulation block
690: strip member

Claims (16)

LNG storage of a double barrier structure including a secondary insulation wall comprising a plurality of secondary insulation panels fixed to the inner wall of the ship, and a primary insulation wall comprising a plurality of primary insulation panels fixed on the upper portion of the secondary insulation panel In the tank,
A secondary fixing device for fixing the secondary insulation panel to the inner wall of the hull,
A coupler rod having a lower end portion fixed to the inner wall side of the hull and an upper end portion extending in an inner direction of the LNG storage tank;
A lower cleat formed to pass through a space in which the coupler rod is accommodated in the center and supported by a lower plate of the secondary insulating panel;
A lower setting plate through which the coupler rod is inserted and supported by the lower cleat;
A fixing nut fastened with the coupler rod to press the lower setting plate in a direction toward the inner wall of the hull;
A lower spring washer interposed between the lower setting plate and the fixing nut;
An intermediate cleat disposed on the lower setting plate;
An intermediate setting plate supported by the intermediate cleat;
An insulating block disposed on the intermediate setting plate;
An upper setting plate supported by the insulating block;
An upper fixing bolt penetrating the insulating block and fixing the intermediate setting plate and the upper setting plate to each other; And
Comprising an upper spring washer interposed between the upper fixing bolt and the upper setting plate,
Insulation panel fixing device of LNG storage tank. The method according to claim 1,
The insulating block is characterized in that provided with a reinforced polyurethane foam (R-PUF) material,
Insulation panel fixing device of LNG storage tank. The method according to claim 2,
The lower cleat and the intermediate cleat are characterized in that it is provided with a wood material,
Insulation panel fixing device of LNG storage tank. The method of claim 3,
The lower setting plate, the intermediate setting plate and the upper setting plate are characterized in that provided with a metal material,
Insulation panel fixing device of LNG storage tank. The method of claim 3,
The secondary fixing device,
Further comprising a lower fixing bolt for mutually fixing the lower setting plate and the intermediate setting plate through the intermediate cleat,
Insulation panel fixing device of LNG storage tank. The method of claim 3,
Each corner of the secondary insulation panel is provided with a secondary fixing portion for coupling with the secondary fixing device,
The secondary fixing device, characterized in that the corner portions of the four secondary insulation panels disposed adjacent to each other are simultaneously fixed,
Insulation panel fixing device of LNG storage tank. The method of claim 6,
The portion in which the secondary fixing part is formed in the secondary insulation panel is provided in a state in which the insulation material and the upper plate constituting the secondary insulation panel are removed and a part of the lower plate is exposed,
Characterized in that the lower setting plates press the exposed lower plates of the four secondary insulating panels disposed adjacent to each other at the same time,
Insulation panel fixing device of LNG storage tank. The method of claim 7,
The lower cleat is characterized in that the lower surface is bonded to the exposed lower plate of the secondary insulating panel by an adhesive, and the outer circumferential surface is bonded to the insulating material constituting the secondary insulating panel by an adhesive,
Insulation panel fixing device of LNG storage tank. The method of claim 8,
The lower cleat is made of four divisions having the same cross-sectional area, and each of the divisions is base-attached to a corner of the secondary insulation panel in the manufacturing step of the secondary insulation panel,
Insulation panel fixing device of LNG storage tank. The method of claim 9,
The intermediate cleat is characterized in that it is made of an integral member,
Insulation panel fixing device of LNG storage tank. The method of claim 10,
The intermediate cleat is characterized in that formed so as to pass through a space in which the lower spring washer and the fixing nut are accommodated in the center,
Insulation panel fixing device of LNG storage tank. The method of claim 3,
The secondary fixing device,
An upper cleat made of wood disposed on the upper setting plate; And
Further comprising a steel (steel) strip member connecting the upper cleat and the upper plate of the secondary insulation panel,
Insulation panel fixing device of LNG storage tank. The method of claim 12,
The strip member is characterized in that it is simultaneously fixed to the upper surface of the upper cleat and the step portion formed on the upper side of the corner of the secondary insulating panel,
Insulation panel fixing device of LNG storage tank. In the LNG storage tank of a double barrier structure in which a secondary insulation panel and a primary insulation panel are sequentially stacked on an inner wall of a ship,
A secondary fixing device for fixing the secondary insulation panel to the inner wall of the hull,
A lower setting plate coupled with a coupler rod fixed to the inner wall of the hull to press the lower plate of the secondary insulation panel;
An intermediate setting plate disposed above the lower setting plate and fixed to each other by the lower setting plate and the lower fixing bolt;
And an upper setting plate disposed on the upper side of the intermediate setting plate and fixed to each other by the intermediate setting plate and an upper fixing bolt,
A cleat made of wood is disposed between the lower plate and the lower setting plate of the secondary insulation panel and between the lower setting plate and the intermediate setting plate to be supported,
Characterized in that to be supported by arranging an insulation block made of reinforced polyurethane foam material between the intermediate setting plate and the upper setting plate,
Insulation panel fixing device of LNG storage tank. The method of claim 14,
Further comprising a fixing nut fastened with the coupler rod to press the lower setting plate in a direction toward the inner wall of the hull,
Characterized in that it has a double spring washer structure by interposing a spring washer between the lower setting plate and the fixing nut, and between the upper setting plate and the upper fixing bolt,
Insulation panel fixing device of LNG storage tank. The method of claim 15,
The secondary insulation panel is supported by a mastic or resin on the inner wall of the hull, but the mastic or resin is a kraft paper and the secondary insulation panel disposed on the inner wall of the hull It is applied between, characterized in that the secondary insulation panel is supported in a non-adhesive manner on the inner wall of the hull,
Insulation panel fixing device of LNG storage tank.

Images