阅读说明：本技术 用于液化天然气储罐的隔热壁固定装置 (Heat insulation wall fixing device for liquefied natural gas storage tank ) 是由 千秉熙 朴世伦 张东爀 于 2019-12-18 设计创作，主要内容包括：本发明公开一种用于液化天然气储罐的隔热壁固定装置。本发明涉及一种用于固定液化天然气储罐的主隔热壁和辅助隔热壁的固定装置,固定装置包括安装在凹槽中的基座插座,凹槽形成在辅助隔热壁的辅助隔热材料的上表面上,其中基座插座布置成使得其下端部分突出为阶梯形,从而允许基座插座的突出阶梯形部分支撑辅助隔热壁的上防护板的下表面部分。(The invention discloses a heat insulation wall fixing device for a liquefied natural gas storage tank. The present invention relates to a fixing device for fixing a main insulation wall and an auxiliary insulation wall of an liquefied natural gas storage tank, the fixing device including a base socket installed in a groove formed on an upper surface of an auxiliary insulation material of the auxiliary insulation wall, wherein the base socket is arranged such that a lower end portion thereof protrudes in a stepped shape, thereby allowing the protruding stepped portion of the base socket to support a lower surface portion of an upper shield plate of the auxiliary insulation wall.)

1. An insulated wall fixture for a liquefied natural gas storage tank, comprising:

a main insulating wall that mainly insulates the liquefied natural gas;

an auxiliary heat insulation wall disposed below the main heat insulation wall and secondarily insulating the liquefied natural gas, the auxiliary heat insulation wall including an auxiliary heat insulation material and an auxiliary upper protection plate disposed on the auxiliary heat insulation material; and

a fixture coupling the primary insulating wall to the secondary insulating wall, the fixture comprising:

a base socket having a lower circumference protruding in a stepped shape; and

a bolt coupled to the base socket,

wherein the base socket has a lower surface mounted on a groove formed on an upper surface of the auxiliary adiabatic material, and the lower circumference of the base socket supports a lower surface of the auxiliary upper shield plate.

2. The insulated wall fixture for an lng storage tank of claim 1, wherein:

the base socket includes a socket main body constituting a main body of the base socket and a socket flange protruding from the socket main body in the stepped shape;

the upper surface of the socket flange is flush with the upper surface of the auxiliary insulating material; and

the auxiliary upper shield plate is disposed across an upper surface of the auxiliary insulating material and an upper surface of the socket flange.

3. The insulated wall fixture for an lng storage tank according to claim 2, wherein an upper surface of the socket main body is flush with an upper surface of the auxiliary upper shield plate.

4. The heat insulating wall fixing apparatus for an liquefied natural gas storage tank according to claim 3, wherein the auxiliary heat insulating material is formed of polyurethane foam (PUF), and the auxiliary upper protection plate is formed of plywood.

5. The insulated wall fixture for an liquefied natural gas storage tank according to claim 4, wherein the base socket is coupled (bonding) to the auxiliary insulating material by bonding.

6. The insulated wall fixture for an lng storage tank of claim 3, further comprising:

an auxiliary sealing wall interposed between the main insulating wall and the auxiliary insulating wall; and

a blade protruding from a body of the bolt such that a lower surface of the blade is mounted on an upper surface of the socket body,

wherein an abutment region between the auxiliary sealing wall and the vane is provided on an upper surface of the socket body.

7. The insulated wall fixture for an liquefied natural gas storage tank according to claim 6, wherein the auxiliary sealing wall is welded to the blade in the abutting region therebetween.

8. An insulated wall securement device for securing a primary insulated wall to a secondary insulated wall in a liquefied natural gas storage tank, comprising:

a base socket mounted on a groove formed on an upper surface of the auxiliary adiabatic material of the auxiliary adiabatic wall, the base socket having a lower circumference protruding in a stepped shape such that a stepped portion of the base socket supports a lower surface of an upper shield plate of the auxiliary adiabatic wall.

9. The insulated wall fixture of claim 8, wherein:

an uppermost surface of the base socket is flush with an upper surface of the upper fender;

a stepped surface of the stepped portion protruding from the base socket is flush with an upper surface of the auxiliary adiabatic material; and

the base socket is formed with a fastening hole through which a bolt is coupled to the main heat insulation wall.

10. The insulated wall fixture of claim 9, wherein said bolts include vanes projecting therefrom to couple to a secondary sealing wall disposed between said primary insulated wall and said secondary insulated wall, and said secondary sealing wall is welded to said vanes on an uppermost surface of said base socket.

Technical Field

The present invention relates to an insulated wall fixing apparatus for an lng storage tank, and more particularly, to an insulated wall fixing apparatus of an lng storage tank that couples a main insulated wall provided for insulating lng to an auxiliary insulated wall.

Background

Natural gas is transported in a gaseous state via onshore or offshore gas pipelines, or in a liquid state (that is, in the form of Liquefied Natural Gas (LNG)) by LNG carriers to remote destinations. LNG is obtained by cooling natural gas to cryogenic temperatures (about-163 ℃) and has a volume of about 1/600 that is the volume of natural gas in the gaseous state. Thus, LNG is suitable for long distance sea transportation.

Structures for transporting or storing LNG (e.g., LNG carriers designed to carry LNG from sea to onshore consumer sites) are equipped with storage tanks (often referred to as "cargo tanks") that can withstand the cryogenic temperatures of the LNG.

Such an LNG storage Tank is divided into an Independent Tank (Independent Tank Type) and a Membrane Type Tank (Membrane Type) depending on whether or not a cargo load is directly applied to an adiabatic material. Generally, the membrane tanks are classified into GTT NO 96 tanks and MARK III tanks, and the independent tanks are classified into MOSS tanks and IHI-SPB tanks.

The NO 96 storage tank includes main and auxiliary closure walls composed of Invar (Ni content: 36%) film of 0.5 mm to 0.7 mm thickness and provided in the form of a thermally insulated box (perlite) manufactured by filling a plywood box (plywood box) with a thermally insulating material (e.g., perlite powder).

Since the main sealing wall and the auxiliary sealing wall of the NO 96 tank have almost the same liquid tightness and strength, it is possible to safely support the cargo for a considerable period of time only with the auxiliary sealing wall even when the main sealing wall is leaked.

In addition, since the heat insulating wall of the NO 96 tank is provided in the form of a wooden box filled with a heat insulating material, the NO 96 tank has high compressive strength and rigidity, and thus it can ensure a high level of weldability and welding automation as compared with the MARK III tank.

The MARK III tank includes a main sealing wall composed of a stainless steel (SUS) film of 1.2 mm thickness, an auxiliary sealing wall composed of a triple sheet (triplet), and a main insulating wall and an auxiliary insulating wall provided in the form of an insulating panel manufactured by bonding plywood to an upper surface or a lower surface of polyurethane foam (polyurethane foam).

The main containment wall of the MARK III tank has corrugations to absorb the thermal contraction caused by LNG at cryogenic temperatures. The wrinkles can prevent excessive stress from occurring on the film by absorbing deformation of the film.

The MARK III tanks have drawbacks in terms of installation/manufacture due to the low level of automation of the main sealing wall constituted by the pleated membrane. However, MARK III tanks are widely used because stainless steel films and triple thin sheets are cheaper and easier to construct than invar steel films and polyurethane foams have good thermal insulation properties.

The main insulation wall of the membrane-type storage tank is coupled to a fixing device (Securing device) provided on an upper surface of the auxiliary insulation wall to be fixedly installed on the upper surface of the auxiliary insulation wall.

Fig. 1 is a schematic view of a typical insulated wall fixture for an LNG storage tank.

Specifically, (a) of fig. 1 illustrates a mechanical coupling between a base socket (10) for forming a main insulation wall and an upper shield plate (20) of an auxiliary insulation wall through a coupling of rivets (Rivet), (b) of fig. 1 illustrates a coupling between the base socket (10) and the upper shield plate (20) of the auxiliary insulation wall through a Bonding (Bonding), and (c) of fig. 1 illustrates a coupling between the base socket (10) and the upper shield plate (20) of the auxiliary insulation wall through a Bonding after cutting a portion of a lower surface of the upper shield plate (20) of the auxiliary insulation wall. Here, reference numeral "30" denotes an insulation material (30) provided inside the auxiliary insulation wall.

Such a typical insulation wall fixing device requires a considerable portion of the upper shield plate (20) to be cut for fixing the base socket (10), thereby causing the strength of the upper shield plate (20) of the auxiliary insulation wall to be reduced.

Although not shown in the drawings, welding of the auxiliary sealing wall is performed to the base socket (10), thereby causing burn damage (burn damage) of the upper shield plate (20) due to welding heat. Therefore, there is a need to provide a solution to these problems.

Disclosure of Invention

Technical problem

An aspect of the present invention is to provide an adiabatic wall fixing apparatus of an LNG storage tank, which can improve the strength of a coupling region between a main adiabatic wall and an auxiliary adiabatic wall by improving a fixing apparatus for coupling the main adiabatic wall and the auxiliary adiabatic wall.

Technical solution

According to an aspect of the present invention, there is provided an adiabatic wall fixing apparatus of an LNG storage tank, including: a main insulating wall that mainly insulates the liquefied natural gas; an auxiliary heat insulation wall disposed below the main heat insulation wall and secondarily insulating liquefied natural gas, the auxiliary heat insulation wall including an auxiliary heat insulation material and an auxiliary upper protection plate disposed on the auxiliary heat insulation material; and a fixing device coupling the main insulation wall to the auxiliary insulation wall, the fixing device including: a base socket having a lower circumference protruding in a stepped shape; and a bolt coupled to the base socket, wherein the base socket has a lower surface mounted on a groove formed on an upper surface of the auxiliary insulation material, and a lower circumference of the base socket supports a lower surface of the auxiliary upper shield plate.

The base socket may include a socket body constituting a body of the base socket and a socket flange protruding from the socket body in a stepped shape, an upper surface of the socket flange being flush with an upper surface of the auxiliary adiabatic material, and an auxiliary upper shield plate may be provided to be disposed on the auxiliary adiabatic material and the upper surface of the socket flange.

The upper surface of the socket main body may be flush with the upper surface of the auxiliary upper guard plate.

The auxiliary insulation material may be formed of polyurethane foam (PUF) and the auxiliary upper protection plate may be formed of plywood.

The base socket may be bonded to the secondary insulation material.

The fixing device may further include: an auxiliary sealing wall interposed between the main heat insulating wall and the auxiliary heat insulating wall; and a blade protruding from a body of the bolt such that a lower surface of the blade is mounted on an upper surface of the socket body, wherein an abutment region between the auxiliary sealing wall and the blade is provided on the upper surface of the socket body.

The auxiliary sealing walls may be welded to the vanes in the adjoining regions therebetween.

According to another aspect of the present invention, there is provided an adiabatic wall fixing apparatus for fastening a main adiabatic wall to an auxiliary adiabatic wall in an LNG storage tank, the fixing apparatus including: and a base socket mounted on a groove formed on an upper surface of the auxiliary adiabatic material of the auxiliary adiabatic wall, wherein a lower end of the base socket protrudes in a stepped shape such that a stepped portion of the base socket supports a lower surface of an upper shield plate of the auxiliary adiabatic wall.

An uppermost surface of the base socket may be flush with an upper surface of the upper shield plate, a stepped surface of a stepped portion protruding from the base socket may be flush with an upper surface of the auxiliary adiabatic material, and the base socket may be formed with a fastening hole through which a bolt is coupled to the main adiabatic wall.

The bolt may include a vane projecting therefrom to couple to a secondary sealing wall disposed between the primary and secondary insulating walls, and the secondary sealing wall may be welded to the vane on the uppermost surface of the base socket.

Advantageous effects

In the adiabatic wall fixing apparatus of an LNG storage tank according to the present invention, the upper surface of the socket flange supports the upper shield plate of the auxiliary adiabatic wall, whereby the upper shield plate can bear a load applied thereto while maintaining its strength, and the cut region of the upper shield plate can be minimized, whereby the fixing apparatus can have higher strength than a typical adiabatic wall fixing apparatus.

In addition, according to the present invention, the welding of the auxiliary sealing wall is performed to the upper surface of the base socket, thereby preventing the burn damage of the auxiliary upper guard plate due to the welding heat.

In addition, the insulation wall fixing apparatus according to the present invention can improve productivity by reducing on-board (on board) labor.

Drawings

Fig. 1 is a schematic view of a typical insulated wall fixture for an LNG storage tank.

Fig. 2 is a schematic view of an insulation structure of an LNG storage tank according to the present invention.

Fig. 3 is a view of an auxiliary insulation panel of an LNG storage tank according to the present invention.

Fig. 4 is a view of a main insulation panel of an LNG storage tank according to the present invention.

Fig. 5 is a schematic view of an adiabatic wall fixing apparatus of an LNG storage tank according to the present invention.

Detailed Description

The above and other aspects, features and advantages of the present invention will become apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail. Throughout the specification, the same components will be denoted by the same reference numerals.

Herein, the terms "primary" and "secondary" are used to distinguish components that provide primary sealing or insulation to an LNG storage tank from components that provide secondary sealing or insulation to an LNG storage tank.

Further, as used herein to describe the components of the canister, the term "upper" or "above … …" refers to the inward direction of the canister regardless of the direction of gravity, and the term "lower" or "below … …" refers to the outward direction of the canister regardless of the direction of gravity.

Fig. 2 is a schematic view of an insulation structure of an LNG storage tank according to the present invention, fig. 3 is a view of an auxiliary insulation panel of the LNG storage tank according to the present invention, and fig. 4 is a view of a main insulation panel of the LNG storage tank according to the present invention.

Referring to fig. 2 to 4, the LNG storage tank according to the present invention has a structure in which an auxiliary adiabatic wall (200) and a main adiabatic wall (100) are sequentially stacked on an inner wall of a hull, the auxiliary adiabatic wall (200) is composed of a plurality of auxiliary adiabatic panels (210), and the main adiabatic wall (100) is composed of a plurality of main adiabatic panels (110).

The auxiliary sealing wall (400) may be interposed between the auxiliary adiabatic wall (200) and the main adiabatic wall (100), and the main sealing wall (not shown) may be disposed on an upper side of the main adiabatic wall (100). For ease of description, the main seal wall is not shown.

The main insulation panel (110) and the auxiliary insulation panel (210) may be manufactured as unit panels each having a hexahedral shape with a width-to-length ratio of about 1:3, preferably as unit panels (sandwich panels) having a size of about 1 × 3 m, but are not limited thereto.

The main insulation panel (110) may be a sandwich panel in which a plywood sheet (112), a plywood sheet (113) are bonded to the upper surface or the lower surface of the insulation material (111) formed of polyurethane foam (PUF), or to both the upper surface and the lower surface of the insulation material (111).

Likewise, the auxiliary insulation panel (210) may be a sandwich panel in which a plywood sheet (212), a plywood sheet (213) are bonded to the upper or lower surface of an insulation material (211) formed of Polyurethane Foam (RPUF), or to both the upper and lower surfaces of the insulation material (111).

Preferably, the primary insulation panel (110) and the secondary insulation panel (210) constituting the primary insulation wall (100) and the secondary insulation wall (200) are formed of rigid polyurethane foam (RPUF) having higher strength than general polyurethane foam so as to form the secondary sealant wall (400) with a flat invar film, as described below.

The auxiliary insulation panel (210) may be fastened to the inner wall of the hull by a cement, such as mastic (mastic), or bolts, and the auxiliary insulation panel (110) may be closely coupled to the upper side of the auxiliary sealing wall (400) by a fixing device (300) provided on the upper side thereof, wherein the auxiliary sealing wall (400) is interposed between the main insulation panel (110) and the auxiliary insulation panel (210).

The main sealing wall (not shown) directly contacts the LNG to seal the LNG, and may be composed of a plurality of stainless steel (SUS) films having wrinkles formed toward the inside of the tank to absorb contraction due to an extremely low temperature inside the tank.

The main sealing wall (not shown) may be constructed of a plurality of unit films and may be sealed by welding the plurality of unit films to anchor strips (anchor strips) on the main insulation panel (110) so as not to create a gap therebetween.

The auxiliary sealing wall (400) may be made of Invar steel (Invar) film.

The secondary sealant wall (400) may be constructed of a plurality of invar strakes, and may be sealed by welding the plurality of invar strakes to tongue (tongue) members on the secondary insulation panel (210) so as to avoid gaps therebetween. Invar strakes refer to a strip-shaped metal plate with a narrow width.

In the LNG tank according to the present invention, each of the main insulation wall (100) and the auxiliary insulation wall (200) is implemented in the form of an insulation panel (panel type) in which a plywood sheet is joined to an upper surface and/or a lower surface of polyurethane foam, and the auxiliary seal wall (400) is composed of a flat invar membrane.

Generally, flat invar films are not suitable for panel-type insulation systems where the insulation panels are formed of polyurethane foam because of their low coefficient of thermal shrinkage. To allow the application of flat invar films to panel-type insulation systems, the insulation walls supporting the films need to be constructed of insulation boxes exhibiting low thermal shrinkage and having high rigidity, as in typical NO 96-type storage tanks.

However, the LNG storage tank according to the present invention has a structure for reinforcing the auxiliary adiabatic wall (200), whereby the auxiliary adiabatic wall (200) may be constructed of an adiabatic panel formed of polyurethane foam, and the auxiliary seal wall (400) may be constructed of a flat invar film.

According to the present invention, in order to reinforce the auxiliary insulation wall (200), the corner portion of the storage tank is provided with a transverse connector (not shown) supporting both ends of the auxiliary sealing wall (400).

The cross connectors are grid structures provided along the edges of each of the front and rear walls of the tank. The lateral connector is welded at one end thereof to an anchoring bar provided at an inner wall of the hull to be fastened to a corner of the storage tank, while supporting both ends of each of the main and auxiliary sealing walls (400) at the other end thereof, thereby enabling load to be transferred to the hull when load is applied to the lateral connector.

The transverse connector is preferably formed of invar material having high rigidity, and a heat insulation box having high rigidity may be provided inside the transverse connector and between the transverse connector and the hull to support the transverse connector. Insulated boxes can be prepared by filling plywood boxes with perlite powder.

According to the invention, the auxiliary thermal insulation wall (200) supporting the auxiliary sealing wall (400) consisting of flat invar film can be constituted by an insulation panel having a lower rigidity than the insulation box, since the transverse connectors transfer part of the load applied to the sealing wall to the hull.

As a result, according to the present invention, a welding line (welding line) can be linearly formed when the auxiliary heat insulating wall (400) is installed on the auxiliary heat insulating wall (200), thereby enabling to improve productivity through automation of welding.

Further, according to the present invention, each of the main insulating wall (100) and the auxiliary insulating wall (200) is constituted by an insulating panel formed of polyurethane foam, thereby improving the insulating performance. Compared to a typical NO 96 type storage tank in which the adiabatic wall is provided in the form of an adiabatic tank, the LNG storage tank according to the present invention can reduce the thickness of the main adiabatic wall to about 40% or more than 40% and the thickness of the auxiliary adiabatic wall to about 20% or more than 20%, while ensuring the same adiabatic effect as the typical NO 96 type storage tank.

The LNG storage tank according to the present invention has a structure in which a secondary insulation panel (210) intersects a primary insulation panel (110) provided on the secondary insulation panel (210).

Referring to fig. 2, the main insulation panel (110) may be disposed to intersect the auxiliary insulation panels (210) such that a corner of each of the main insulation panels (110) is placed at the center of each of the auxiliary insulation panels (210), whereby each main insulation panel (110) is disposed to span the upper surfaces of four auxiliary insulation panels (210).

In order to achieve an intersection between the primary insulation panel (110) and the secondary insulation panel (210), a fixing device (300) adapted to fasten the primary insulation panel (110) to the secondary insulation panel (210) may be provided inside the edges on the upper surface of the secondary insulation panel (210), for example at the center of each of the upper surfaces of the secondary insulation panels (210).

Referring to fig. 3, one fixing device (300) may be disposed at the center of the auxiliary insulation panel (210), and the other fixing devices (300) may be arranged to be separated from the fixing device (300) at the center of the auxiliary insulation panel (210) by the same distance in the longitudinal direction.

The fixing means (300) is disposed on a center line (C) on the auxiliary insulation panel (210) in a width direction to minimize displacement of the auxiliary insulation panel (210) in the width direction due to stress applied to the auxiliary insulation panel (210), and the slit (214) may be formed at a position separated from the fixing means (300) in front and rear by the same distance to minimize displacement of the fixing means (300) in a longitudinal direction.

Furthermore, each of the main insulation panels (110) may be provided with a fixing portion (S) for coupling to a fixing device (300) at vertical edges on lateral sides of the main insulation panel (110) containing the four corners of the main insulation panel (110). The fixing portions (S) may be arranged at constant intervals in a longitudinal direction of the main insulation panel (110).

Each of the fixing portions (S) may be provided as a groove having a semicircular or sectorial cross section, and may be compressed by a bolt fastening a nut to the fixing device, wherein the bolt of the fixing device (300) is inserted into the fixing portion (S) to pass therethrough, whereby the main insulation panel (110) may be brought into close contact with the auxiliary insulation panel (210). This structure will be described in more detail below.

In this embodiment, three fixing devices (300) are provided on the auxiliary insulation panel (210), and eight fixing portions (S) are provided at the vertical edge of the main insulation panel (110).

According to this embodiment, the fixing portions (S) formed on the four main insulation panels (110) may be coupled together to the fixing device (300) disposed at the center of the auxiliary insulation panel (210), and the fixing portions (S) formed on the two main insulation panels (110) may be coupled together to the fixing device (300) separated from the center of each of the auxiliary insulation panels (210).

Thus, according to this embodiment, the adjacent main insulation panels (110) may share the fixing means (300) interposed therebetween, and eight points for supporting the main insulation panels (110) may be secured only by the three fixing means (300) provided to one auxiliary insulation panel (210).

That is, according to the present invention, a fixing portion (S) for coupling to a fixing device (300) is provided at a corner of a main insulation panel (110), whereby a point for supporting the main insulation panel (110) can be fixed as much as possible even with a small number of fixing devices (300), thereby improving stability of a support structure and productivity of the insulation panel.

Reference numeral "215" denotes an insertion groove 215 formed to receive a tongue member to which an invar strake constituting the auxiliary seal wall (400) is welded, and reference numeral "115" denotes an insertion groove 115 formed to receive a tongue member received in the insertion groove (215) and to which the edge of the invar strake is welded.

Reference numeral "114" denotes a plurality of slits 114 formed on the main insulation panel (110) to distribute stress concentration caused by heat shrinkage, and reference numeral "116" denotes an anchor tape 116 provided for welding the main seal wall.

Fig. 5 is a schematic view of an adiabatic wall fixing apparatus of an LNG storage tank according to the present invention. Hereinafter, the structure of the adiabatic wall fixing device (300) of the LNG storage tank according to the present invention will be described.

As shown in fig. 5, the main insulation wall (100) includes a main insulation material (111) and a main lower guard plate (113), and the auxiliary insulation wall (200) includes an auxiliary insulation material (211) and an auxiliary upper guard plate (212). As described above, both the main insulation material (111) and the auxiliary insulation material (211) may be formed of polyurethane foam (PUF), and both the main lower protection plate (113) and the auxiliary upper protection plate (212) may be formed of plywood sheets.

The auxiliary upper shield plate (212) of the auxiliary insulation wall (200) may be formed with a hole corresponding to a socket body (311) described below, and the main insulation wall (100) may be formed with a fixing portion (S) for coupling to a fixing device (300). The fixing portion (S) provides a space for receiving an upper portion of the fixing device (300).

Referring to fig. 5, the adiabatic wall fixing device (300) of the LNG storage tank according to the present invention includes a base socket (310), a bolt (320), and a locking nut (330), the base socket (310) being disposed on the auxiliary adiabatic wall (200), the bolt (320) being screwed to the base socket (310) and having an upper end inserted into a fixing portion (S), the fixing portion (S) being formed on the main adiabatic wall (100), the locking nut (330) being coupled to the bolt (320) inserted into the fixing portion (S).

The socket body (310) includes a socket body (311) and a socket flange (312), the socket body (311) constituting a body of the socket body (310), the socket flange (312) protruding from a lower circumference of the socket body (311) to be inserted into a space between a groove formed on an upper surface of the auxiliary adiabatic material (211) and the auxiliary upper shield plate (212).

The base socket (310) may be mounted on a groove formed on an upper surface of the auxiliary adiabatic material (211) by bonding a lower surface of the base socket (310) to an upper surface of the groove.

An upper surface of the socket main body (311) may be flush with an upper surface of the auxiliary upper shield plate (212), and an upper surface of the socket flange (312) may be flush with an upper surface of the auxiliary insulation material (211). That is, as shown in the drawings, the base socket (310) may have a cross section presented in a stepped shape by a socket main body (311) and a socket flange (312).

The socket flange (312) is inserted into a space between the groove formed on the upper surface of the auxiliary insulation material (211) and the auxiliary upper shield plate (212) such that the upper surface of the socket flange (312) supports the end of the auxiliary upper shield plate (212).

According to the present invention, the socket flange (312) allows the auxiliary upper shield plate (212) to bear a load applied from the fixture (300) by supporting the auxiliary upper shield plate (212), and the auxiliary upper shield plate (212) is not cut in a thickness direction, and thus can bear the load while maintaining its strength.

Accordingly, the insulation wall fixing apparatus according to the present invention can secure higher fastening strength than a typical fastening mechanism (see fig. 1), and strength reinforcement can be facilitated by adjusting the size or thickness of the base socket (310), the thickness of the auxiliary upper shield plate (212), and the like, as needed.

The base socket (310) may be formed of stainless steel (SUS).

The base socket (310) can be fastened to the upper side of the auxiliary insulating wall (200) by: placing a base socket (310) on a groove formed on an upper surface of the auxiliary adiabatic material (211); next, the base socket (31) is coupled to the auxiliary upper shield plate (212) such that the auxiliary upper shield plate (212) is placed on the upper surface of the auxiliary insulation material (211) and the upper surface of the socket flange (312).

That is, the insulation wall fixing apparatus (300) according to the present invention can be stored together with the base socket (310) provided on the auxiliary insulation wall (200), thereby improving productivity by omitting riveting and bonding operations in a ship-on board operation.

According to the present invention, the bolt (320) may be a ring stud and may include a blade (321) protruding from the body of the bolt (320) and mounted on the upper surface of the socket body (311).

The blade (321) extends from the body of the bolt (320) to be inclined downward therefrom such that a distal end of the blade (321) is placed on an upper surface of the socket body (311).

Here, the auxiliary sealing wall (400) may be coupled to the distal end of the vane (321) by welding. That is, as shown in the drawings, the auxiliary sealing wall (400) may be welded to the distal end of the vane (321) to be placed between the auxiliary heat insulation wall (200) and the main heat insulation wall (100).

According to the present invention, a contact region between the auxiliary sealing wall (400) and the blade (321) is formed on the upper surface of the socket body (311), and the auxiliary sealing wall (400) is welded to the blade (321) in the contact region therebetween.

Therefore, according to the present invention, the welding of the auxiliary sealing wall (400) is performed to the upper surface of the socket main body (311), thereby preventing the burn damage on the auxiliary upper shield plate (212) of the auxiliary insulation wall (210).

In addition, in a structure in which the bolt (320) is provided in the form of a stud bolt including the blade (321) as described above, the blade (321) is welded to the auxiliary sealing wall (400) to ensure watertightness between the base socket (310) and the bolt (320), whereby the bolt-fastening hole (h) of the base socket (310) may be formed in the form of a through-hole or a blind-hole.

If the bolt (320) is a typical bolt, watertightness cannot be ensured in the gap for fastening between the base socket (310) and the bolt (320). In this case, the bolt fastening hole (h) of the base socket (310) is preferably formed in a blind hole shape.

The adiabatic wall fixing device (300) of the LNG storage tank according to the present invention may further include a flat washer (340), the flat washer (340) being inserted into the bolt (320) through an upper portion of the bolt (320) and supported by the main lower shield plate (113) in the region of the fixing portion (S); and a spring washer (350) disposed on an upper surface of the flat washer (340) and supporting the locking nut (330).

Although some embodiments have been described herein, it is to be understood that these embodiments are provided for purposes of illustration only and are not to be construed as limiting the invention in any way, and that various modifications, changes, alterations, and equivalent embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be determined by the appended claims and their equivalents.