Manufacturing method of liquefied gas storage tank and liquefied gas storage tank manufactured by the same and ship having liquefied gas storage tank

Abstract

The present invention relates to a method for manufacturing a liquefied gas storage tank, a liquefied gas storage tank manufactured thereby, and a ship. The method for manufacturing a liquefied gas storage tank, which forms a space closed by a wall comprising a flat block and a corner block, comprises: a first step of measuring the flatness of a first surface and a second surface that are connected to each other among the surfaces of the space in which the wall is formed; a second step of calculating the thickness of a first leveling wedge to be placed in a portion where the first surface and the second surface are connected; and a third step of calculating the thickness of a second leveling wedge to be placed in a portion that is not connected to the other surface from at least one of the first surface or the second surface, wherein the first surface and the second surface are connected to each other with a corner side in between, and the first leveling wedge includes a plurality of leveling wedges provided on both sides of the corner side.

Description

Technology Field

[0001] The present invention relates to a method for manufacturing a liquefied gas storage tank, a liquefied gas storage tank manufactured thereby, and a ship. Background Technology

[0002] To store and transport large quantities of substances such as hydrogen, oxygen, and natural gas, they are primarily converted into high-pressure, low-temperature liquefied gases through cryogenic liquefaction methods. In designing insulated vessels for storing and transporting these low-temperature liquefied gases, insulation technology that prevents the liquefied gas from boiling due to external heat intrusion is crucial.

[0003] Currently, commercially applied insulation methods include external insulation and internal insulation. Internal insulation methods have the advantage of not restricting the use of materials, such as low-temperature materials, because the temperature of the container casing can be controlled to be similar to the ambient temperature. Among such internal insulation methods, a membrane-type insulation system having a double barrier structure based on an intermediate barrier structure is known.

[0004] The membrane insulation system may have a double barrier structure comprising upper / lower insulation panels that are insulation members, a membrane metal panel that forms a primary barrier on the upper insulation panel, and a secondary barrier installed to be located between the upper / lower insulation panels.

[0005] A liquefied gas storage tank with a membrane insulation system as described above may have a structure in which the bulkhead structure of the hull forms the outer surface and a membrane insulation system with a double barrier structure is installed inside the bulkhead. Here, the liquefied gas storage tank may be manufactured by attaching a unit insulation laminate, in which a lower insulation panel, a secondary barrier, and an upper insulation panel are stacked, to the bulkhead, and then installing a primary barrier.

[0006] In addition, the unit insulation laminate can be divided into a flat block placed on the flat surface of the bulkhead and a corner block placed at the corner where the flat surfaces are connected.

[0007] Here, flat blocks and corner blocks need to be precisely installed in the bulkheads of the hull. The problem to be solved

[0008] The present invention was created to solve the problems of the prior art as described above, and one objective of the present invention is to provide a method for manufacturing a liquefied gas storage tank in which planar blocks and corner blocks can be precisely installed, and a liquefied gas storage tank and a ship manufactured thereby. means of solving the problem

[0009] A method for manufacturing a liquefied gas storage tank according to one aspect of the present invention comprises: a first step of measuring the flatness of a first surface and a second surface that are connected to each other among the surfaces of the space in which the wall is formed; a second step of calculating the thickness of a first leveling wedge to be placed in a portion where the first surface and the second surface are connected; and a third step of calculating the thickness of a second leveling wedge to be placed in a portion that is not connected to the other surface from at least one of the first surface or the second surface, wherein the first surface and the second surface are connected to each other with a corner side in between, and the first leveling wedge includes a plurality of leveling wedges provided on both sides of the corner side.

[0010] Specifically, the method may further include the step of installing the corner block using the first leveling wedge and installing the flat block using the second leveling wedge.

[0011] Specifically, the planar blocks may be installed adjacent to each other on at least one of the first surface and the second surface.

[0012] Specifically, the thickness of the second leveling wedge can be calculated such that the angle formed by the outer or inner surfaces of a plurality of adjacent planar blocks is within a reference value.

[0013] Specifically, the corner block may have a shape in which the outer surface fixed to the wall by a leveling wedge is bent to correspond to the angle formed by the connection of the first surface and the second surface.

[0014] Specifically, the corner block may have a shape in which one side is fixed to the first surface and the other side is fixed to the second surface, and is bent between the one side and the other side to correspond to the angle between the first surface and the second surface.

[0015] Specifically, the thicknesses of the first leveling wedge and the second leveling wedge can be calculated such that the angle formed between one side of the corner block and the outer or inner surface of the flat block adjacent to one side of the corner block is within a reference value.

[0016] Specifically, the second step can be performed simultaneously with the third step.

[0017] A liquefied gas storage tank according to one aspect of the present invention is manufactured through a method for manufacturing said liquefied gas storage tank.

[0018] A vessel according to one aspect of the present invention has the liquefied gas storage tank. Effects of the invention

[0019] The method for manufacturing a liquefied gas storage tank according to the present invention allows marking lines to be marked using a corrected center line on the surfaces of the hull space where the walls of the liquefied gas storage tank are formed, thereby enabling precise installation of flat blocks and corner blocks.

[0020] In addition, the method for manufacturing a liquefied gas storage tank according to the present invention can precisely calculate or correct the thickness of the leveling wedge, so that the angle formed by the corner blocks of the corner section and the angle formed by the surfaces of the hull space can be substantially the same.

[0021] In addition, the method for manufacturing a liquefied gas storage tank according to the present invention minimizes the need for modification work during the actual installation of the leveling wedge by considering two planes connected to each other with a corner in between, rather than considering only one plane when deriving the thickness of the leveling wedge. Brief explanation of the drawing

[0022] FIG. 1 is a perspective view of a liquefied gas storage tank according to the present invention. FIG. 2 is a partial cross-sectional view for explaining the planar structure of a liquefied gas storage tank according to a first embodiment of the present invention. Figure 3 is a partial cross-sectional view illustrating the corner structure of the liquefied gas storage tank shown in Figure 1. Figure 4 is an enlarged view of the EA1 area of ​​Figure 3. FIG. 5 is a drawing illustrating the state in which the center lines of each side of the space for installing the wall of a liquefied gas storage tank according to the first embodiment of the present invention are calculated. Figure 6 is a cross-sectional view of a space for wall installation shown in Figure 5. FIG. 7 is a flowchart illustrating a method for manufacturing a liquefied gas storage tank according to a first embodiment of the present invention. FIG. 8 is a drawing illustrating the state in which the center lines of each side of the space for installing the wall of a liquefied gas storage tank according to the second embodiment of the present invention are calculated. FIG. 9 is a cross-sectional view of a space for wall installation shown in FIG. 8. FIG. 10 is a flowchart for explaining a method for manufacturing a liquefied gas storage tank according to a second embodiment of the present invention. FIG. 11 is a flowchart illustrating a method for manufacturing a liquefied gas storage tank according to a third embodiment of the present invention. FIG. 12 is a drawing showing a leveling wedge, etc. of a liquefied gas storage tank according to the fourth embodiment of the present invention. FIG. 13 is a flowchart illustrating a method for manufacturing a liquefied gas storage tank according to a fourth embodiment of the present invention. Specific details for implementing the invention

[0023] The objects, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings. It should be noted that in assigning reference numerals to the components of each drawing in this specification, identical components are assigned the same number whenever possible, even if they are shown in different drawings. Furthermore, in describing the present invention, detailed descriptions of related prior art are omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of the invention.

[0024] In addition, the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; it should be understood that all modifications, equivalents, and substitutions included within the concept and technical scope of the present invention are included.

[0025] Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0026] In the present specification, the term "liquefied gas" may be used to encompass all gaseous fuels that are generally stored in a liquid state, such as LNG, LPG, ethylene, ammonia, etc., and for convenience, cases where they are not in a liquid state due to heating or pressurization may also be referred to as liquefied gas. This may also apply to evaporated gas. Furthermore, for convenience, the term "LNG" may be used to encompass not only NG (Natural Gas) in a liquid state but also LNG in a supercritical state, and the term "evaporated gas" may be used to include not only evaporated gas in a gaseous state but also liquefied evaporated gas.

[0027] In addition, the present invention includes a vessel equipped with a liquefied gas storage tank as described below. The vessel may be at least a vessel that uses liquefied gas as propulsion fuel / power generation fuel, and the concept includes all of the following: gas carriers, merchant vessels that transport cargo or people other than gas, FSRUs, FPSOs, bunkering vessels, offshore plants, etc.

[0028] Additionally, please note that the terms "inside" and "outside" described below are defined as the direction facing the center of the accommodation space being the inner direction.

[0030] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0031] FIG. 1 is a perspective view of a liquefied gas storage tank according to the present invention, FIG. 2 is a partial cross-sectional view for explaining the planar structure of a liquefied gas storage tank according to one embodiment of the present invention, FIG. 3 is a partial cross-sectional view for explaining the corner structure of the liquefied gas storage tank shown in FIG. 1, and FIG. 4 is an enlarged view of the EA1 area of ​​FIG. 3.

[0032] Referring to FIGS. 1 to 4, the liquefied gas storage tank (1) according to the present invention can be mounted on a hull (H). At this time, the liquefied gas storage tank (1) may be of the membrane type in which the bulkhead structure of the hull (H) forms the outer surface of the tank, or it may be of the independent type in which the liquefied gas storage tank (1) is installed within the internal space of the hull (H).

[0033] The type of the liquefied gas storage tank (1) is not specifically limited, and the location where the liquefied gas storage tank (1) is mounted on the hull (H) (inside the ship or outside the ship, such as on the upper deck) is also not limited. However, the liquefied gas storage tank (1) of the present invention may have a structure in which an insulation system is arranged in an inward direction.

[0034] For reference, in this specification, the liquefied gas storage tank (1) is described as being in the form of a membrane insulation system in which an insulation system is directly installed on the bulkhead of the hull (H). However, since the liquefied gas storage tank (1) may be provided as a standalone type, the expression "hull (H)" below may be interpreted as being replaced with the outer body of the liquefied gas storage tank (1).

[0035] The liquefied gas storage tank (1) has a receiving space. Liquefied gas can be received in the receiving space, and the liquefied gas can be LNG. Although the following description assumes that the liquefied gas is LNG, in addition to LNG, the liquefied gas in the present invention can include all substances (LPG, ethane, hydrogen, ammonia, etc.) that have a boiling point lower than room temperature, are forcibly liquefied for storage, and have a calorific value.

[0036] The receiving space of the liquefied gas storage tank (1) can be enclosed by a wall (100) to form a closed space. However, for the inflow and outflow of liquefied gas, a dome (200), etc. is installed on the upper surface of the wall (100). That is, the liquefied gas storage tank (1) may include a wall (100) and a dome (200).

[0037] The wall (100) may include planar and corner structures. For example, the transverse walls in the front-rear direction of the wall (100), the floor between the transverse walls, the vertical walls, and the ceiling may correspond to a planar structure. Additionally, for example, the structure where the transverse walls, floor, vertical walls, and ceiling of the wall (100) meet may correspond to a corner structure. Here, the corner structure may include an obtuse corner structure or a right corner structure.

[0038] The planar structure of the wall (100) can be formed by a combination of a plurality of planar blocks as shown in FIG. 2, and the corner structure of the wall (100) can be formed by a combination of a plurality of corner blocks as shown in FIG. 3. These plurality of planar blocks can be connected to a plurality of corner blocks at the corner portion of the wall (100).

[0039] As illustrated in FIGS. 2 and 3, the planar block and corner block of the wall (100) may be configured to include a primary barrier (10) in contact with the liquefied gas, a primary insulation wall (20) installed on the outside of the primary barrier (10), a secondary barrier (30) installed on the outside of the primary insulation wall (20), and a secondary insulation wall (40) disposed on the outside of the secondary barrier (30). The liquefied gas storage tank (1) may be supported on the hull (2) by an adhesive member (50), such as mastic, installed between the secondary insulation wall (40) and the hull (2), and a fixing member, such as a stud (90).

[0040] In the above, the primary barrier (10) may be composed of a flat primary barrier (10a) of a flat block and a corner primary barrier (10b) of a corner block, the primary insulation wall (20) may be composed of a flat primary insulation wall (20a) of a flat block and a corner primary insulation wall (20b) of a corner block, the secondary barrier (30) may be composed of a flat secondary barrier (30a) of a flat block and a corner secondary barrier (30b) of a corner block, and the secondary insulation wall (40) may be composed of a flat secondary insulation wall (40a) of a flat block and a corner secondary insulation wall (40b) of a corner block.

[0041] In the above, the primary barrier (10) may form a receiving space for accommodating liquefied gas, which is a cryogenic material. The primary barrier (10) may be made of a metal material to suppress brittle fracture caused by low-temperature liquefied gas. For example, the primary barrier (10) may be composed of stainless steel or INVAR, but is not limited thereto. The primary barrier (10) can prevent the liquefied gas from leaking to the outside together with the secondary barrier (30).

[0042] The primary barrier (10) can be fixedly connected to the upper part of the primary insulation wall (20) by an anchor strip (not shown) and installed so as to be in direct contact with the liquefied gas, which is a cryogenic material stored in the liquefied gas storage tank (1).

[0043] The primary barrier (10) may have a structure with folds or irregularities formed to prevent sloshing. As these primary barriers (10) are overlapped and sealed by welding or the like, the entire accommodation space (excluding the dome (200) portion) can be made into a closed space.

[0044] In addition, the first barrier (10) can function as a barrier to prevent leakage of liquefied gas. Also, since the second barrier (30) described later also serves as a barrier to prevent leakage of liquefied gas, the liquefied gas storage tank (1) of the present invention can have a structure that implements at least double leakage prevention.

[0045] In the above, the primary insulation wall (20) may have a structure in which primary plywood (20aa) and primary insulation material (20ab) are sequentially stacked on the outside of the primary barrier (10).

[0046] The primary plywood (20aa) can be installed between the primary barrier (10) and the primary insulation (20ab).

[0047] The primary insulation material (20ab) can be formed from a material with excellent thermal insulation performance and mechanical strength so as to block heat intrusion from the outside and withstand impact from the outside or impact caused by liquefied gas sloshing from the inside. The primary insulation material (20ab) can be formed from polyurethane foam between the primary plywood (20aa) and the secondary barrier (30).

[0048] In addition, in the primary insulation wall (20), the planar primary insulation wall (20a) and the corner primary insulation wall (20b) may have the same laminated structure.

[0049] The primary insulation wall (20) is designed to block heat intrusion from the outside and withstand impact from the outside or impact caused by liquefied gas sloshing from the inside, and can be installed in a closed space between the primary barrier (10) and the secondary barrier (30). Accordingly, the space where the primary insulation wall (20) is placed can form an insulation space, and the insulation space where the primary insulation wall (20) is placed can be referred to as the primary insulation space.

[0050] The secondary insulation wall (40) may have a structure in which secondary insulation material (40aa) and secondary plywood (40ab) are sequentially laminated on the outer side of the secondary barrier (30).

[0051] The secondary insulation material (40aa) can be formed from a material with excellent thermal insulation performance and mechanical strength so as to block heat intrusion from the outside and withstand impact from the outside or impact caused by liquefied gas sloshing from the inside. The secondary insulation material (40aa) can be formed from polyurethane foam between the secondary barrier (30) and the secondary plywood (40ab).

[0052] The secondary plywood (40ab) can be installed between the secondary insulation (40aa) and the hull (2). For example, the secondary insulation (40aa) can also be installed in contact with the secondary plywood (40ab).

[0053] In addition, in the secondary insulation wall (40), the planar secondary insulation wall (40a) and the corner secondary insulation wall (40b) may have the same laminated structure.

[0054] In the above, the secondary barrier (30) of the planar block and the corner block may include a planar connecting barrier (31a) or a corner connecting barrier (31b) that connects the planar secondary barrier (30a) or the corner secondary barrier (30b) that are adjacently placed when a plurality of planar blocks or a plurality of corner blocks are arranged adjacently.

[0055] The secondary insulation wall (40) is placed within the closed space between the secondary barrier (30) and the hull (2), and the space where the secondary insulation wall (40) is placed may be referred to as the secondary insulation space.

[0056] That is, the wall (100) is arranged to be stacked in the order of primary barrier (10) - primary insulation space (primary insulation wall (20)) - secondary barrier (30) - secondary insulation space (secondary insulation wall (40)) - bulkhead of the hull (2) as it goes from the inside to the outside, and the primary insulation space and the secondary insulation space can be finished by the dome (200) described later.

[0057] In this way, a receiving space for a liquefied gas storage tank (1) can be formed by a wall (100) having a double barrier and a double insulating wall (insulating space). The wall (100) can be formed to include a flat surface, a curved surface, an inclined surface, etc., to form a receiving space of various shapes.

[0058] A dome (200) is provided on a wall (100) that forms the upper surface of the accommodation space. The wall (100) that forms the accommodation space has an open upper surface for the inflow and outflow of liquefied gas or evaporated gas, and a dome (200) can be installed and finished in the open portion.

[0059] In particular, the liquefied gas storage tank (1) of the present invention can be applied to a ship, and the ship may include an inner deck forming the upper surface of the accommodation space and a trunk deck provided on the outside of the inner deck, and the dome (200) may be provided in a form that penetrates both the inner deck and the trunk deck.

[0060] The dome (200) can finish the insulation space formed in the wall (100). As previously described, the insulation space is independently provided on the inner and outer sides of the secondary barrier (30) in the wall (100), respectively, and the dome (200) can finish the primary insulation space and the secondary insulation space so as to separate them from each other.

[0061] The domes (200) may be provided in multiple numbers to independently handle the inflow and outflow of liquefied gas and evaporated gas, and the dome (200) for the inflow and outflow of liquefied gas may be referred to as a tank dome (210), and the dome (200) for the inflow and outflow of evaporated gas may be referred to as a vapor dome (220).

[0062] Here, a pump tower (400) may be provided extending downward from the vapor dome (220) for the inflow and outflow of liquefied gas, and the tank dome (210) may be positioned at a location spaced apart from the vapor dome (220) and may receive evaporated gas without the pump tower (400) and discharge it to the outside.

[0064] In the following, with reference to FIG. 2, a flat portion of the wall (100) of a liquefied gas storage tank (1) according to an embodiment of the present invention will be described.

[0065] As shown in FIG. 2, the flat portion of the wall (100) is made of a combination of a plurality of flat blocks, and the flat blocks can be placed on the flat portion on a first or second surface at different angles to form a storage space for accommodating liquefied gas.

[0066] The planar block may include a planar primary insulation wall (20a) positioned on the outside of the planar primary barrier (10a) and fixing a planar primary barrier (10a) made of metal material, a planar secondary barrier (30a) provided on the outside of the planar primary insulation wall (20a), and a planar secondary insulation wall (40a) positioned on the outside of the planar secondary barrier (30a).

[0067] The planar primary barrier (10a) is positioned on a flat portion of a first or second surface at different angles to form a receiving space for accommodating liquefied gas, which is a cryogenic material, and may be made of a metal material. For example, the metal material may be stainless steel, but is not limited thereto. The planar primary barrier (10a) can prevent the liquefied gas from leaking to the outside together with the planar secondary barrier (30a).

[0068] The flat primary barrier (10a) can be fixedly connected to the upper part of the flat primary insulation wall (20a) by a metal strip (not shown) and installed so as to be in direct contact with the liquefied gas, which is a cryogenic material stored in the liquefied gas storage tank (1).

[0069] This planar primary barrier (10a) can seal the planar primary insulation wall (20a) and the corner primary barrier (10b) shown in FIG. 3 when the planar block and the corner block shown in FIG. 3 are connected by being placed adjacently.

[0070] The planar primary insulation wall (20a) is designed to block heat intrusion from the outside and withstand impact from the outside or impact from liquefied gas sloshing from the inside, and can be installed between the planar primary barrier (10a) and the planar secondary barrier (30a).

[0071] The planar primary insulation wall (20a) may have a structure in which primary plywood (20aa) and primary insulation material (20ab) are sequentially stacked on the outside of the planar primary barrier (10a).

[0072] The planar primary insulation wall (20a) is part of the planar block together with the planar secondary barrier (30a) and the planar secondary insulation wall (40a), and the planar primary insulation wall (20a) forming the planar block may have a width smaller than the width of the planar secondary insulation wall (40a), which is another component of the planar block. As a result, parts of the planar secondary barrier (30a) may be exposed on both sides of the planar primary insulation wall (20a). When multiple planar blocks are arranged adjacently, connecting insulation walls (21, 21a) may be installed in the space between the adjacent planar primary insulation walls (20a), that is, in the space where the planar secondary barrier (30a) is exposed.

[0073] The connecting insulation wall (21, 21a) is positioned between adjacent planar primary insulation walls (20a) when planar blocks are placed adjacent to each other, and may be provided in a laminated form of connecting plywood (21ab) and connecting insulation material (21aa) that is identical or similar to the planar primary insulation wall (20a), and may have the same or similar thickness as the planar primary insulation wall (20a).

[0074] These connecting insulation walls (21, 21a) can be installed to block heat intrusion from the outside by sealing the space between adjacent planar secondary insulation walls (40a) together with the planar connecting barrier (31a) when a plurality of planar blocks are arranged adjacently.

[0075] Additionally, the connecting insulation wall (21, 21a) may also be provided between the corner block and the flat block. For example, in a section where the corner block and the flat block are placed adjacently, the connecting insulation wall (21, 21a) can seal the gap between the adjacent flat secondary insulation wall (40a) and the corner secondary insulation wall (40b) together with the flat connecting barrier (31a).

[0076] The planar secondary barrier (30a) can be installed between the planar primary insulation wall (20a) and the planar secondary insulation wall (40a), and together with the planar primary barrier (10a), it can prevent liquefied gas from leaking out.

[0077] The planar secondary barrier (30a) is part of the planar block together with the planar primary insulation wall (20a) and the planar secondary insulation wall (40a), and when the planar blocks are placed adjacently, the adjacent planar secondary barriers (30a) can be connected by a planar connecting barrier (31a).

[0078] The planar connecting barrier (31a) can connect adjacent planar secondary barriers (30a) that are exposed to the outside when planar blocks are placed adjacently, and a connecting insulation wall (21, 21a) can be installed on the top.

[0079] The planar secondary insulation wall (40a) can be designed to block heat intrusion from the outside together with the planar primary insulation wall (20a) and the connecting insulation wall (21, 21a) while withstanding impact from the outside or impact caused by liquefied gas sloshing from the inside. Additionally, the planar secondary insulation wall (40a) can be installed between the planar secondary barrier (30a) and the hull (2) and can be constructed including insulation material and plywood.

[0080] The planar secondary insulation wall (40a) may have a structure in which secondary insulation material (40aa) and secondary plywood (40ab) are sequentially laminated on the outside of the planar secondary barrier (30a).

[0082] In the following, with reference to FIG. 3, a corner portion of the wall (100) of a liquefied gas storage tank (1) according to an embodiment of the present invention will be described.

[0083] The corner portion of the wall (100) may be formed by a combination of multiple corner blocks. The structure of the wall (100) described below is explained as an example of an obtuse corner structure forming an angle of 135 degrees, but it may not be limited to that number.

[0084] As illustrated in FIG. 3, the corner block of the wall (100) is positioned at the corner portion where a first surface and a second surface of different angles meet to form a storage space for accommodating liquefied gas, and may include a corner primary insulation wall (20b) positioned on the outside of the corner primary barrier (10b) and a corner secondary barrier (30b) provided on the outside of the corner primary insulation wall (20b), and a corner secondary insulation wall (40b) positioned on the outside of the corner secondary barrier (30b). Here, the corner primary insulation wall (20b) may further include an inner fold portion (21b).

[0085] The corner primary barrier (10b) is positioned at the corner where the first or second surfaces of different angles meet to form a receiving space for accommodating liquefied gas, which is a cryogenic material, and may be made of a metal material. The corner primary barrier (10b) can prevent the liquefied gas from leaking out together with the corner secondary barrier (30b).

[0086] Although not shown in FIG. 3, the corner primary barrier (10b) can be fixedly connected to the corner primary insulation wall (20b) by a barrier fixing member installed in various ways, such as adhesive or bolting, at the upper part of the corner primary insulation wall (20b), so as to be installed to come into direct contact with the liquefied gas, which is a cryogenic material stored in the liquefied gas storage tank (1). Accordingly, the corner primary barrier (10b) mentioned below may be used to mean including the barrier fixing member, etc.

[0087] This corner primary barrier (10b) can seal the corner primary insulation wall (20b) and the flat primary barrier (10a) shown in FIG. 2 when the corner block and the flat block shown in FIG. 2 are arranged adjacently and connected, and can be fixed to the inner plywood of the inner first fixing part (22b) and the inner plywood of the inner second fixing part (23b), and can be arranged to be bent at a certain angle, for example, 135 degrees, on the inner surface of the inner bending part (21b).

[0088] The corner primary insulation wall (20b) is designed to block heat intrusion from the outside and withstand impact from the outside or impact from liquefied gas sloshing from the inside, and can be installed between the corner primary barrier (10b) and the corner secondary barrier (30b).

[0089] The corner primary insulation wall (20b) is provided on the inner side of the first and second sides, respectively, and may include an inner first fixing part (22b) and an inner second fixing part (23b) configured in a structure in which inner plywood, insulation material, and outer plywood are sequentially stacked on the outer side of the corner primary barrier (10b).

[0090] Here, the inner first fixing part (22b) is fixed to the outer first fixing part (41b) and provided on the inner side of the first surface, and the inner second fixing part (23b) is fixed to the outer second fixing part (42b) and provided on the inner side of the second surface.

[0091] Additionally, the corner primary insulation wall (20b) may include an inner folded portion (21b) made of an insulating material such as polyurethane foam, which is filled between the inner first fixing portion (22b) and the inner second fixing portion (23b).

[0092] The thickness of the inner plywood, insulation material, and outer plywood combined in this corner primary insulation wall (20b) may be the same as the thickness of the aforementioned flat primary insulation wall (20a).

[0093] In this embodiment, the inner first and second fixing parts (22b, 23b) for holding the barrier fixing member to which the corner primary barrier (10b) is fixed in the corner block are formed with a composition combining plywood and an insulating material, thereby improving the thermal insulation performance compared to one composed only of plywood, reducing weight, and reducing costs.

[0094] Each of the inner first and second fixing parts (22b, 23b), which are composed of a corner first insulation wall (20b), is fixed to each of the outer first and second fixing parts (41b, 42b), which are composed of a corner second barrier (30b) and a corner second insulation wall (40b), and the width of each of these inner first and second fixing parts (22b, 23b) may be smaller than the width of each of the outer first and second fixing parts (41b, 42b). As a result, when a plurality of corner blocks are arranged adjacently along the edge of the corner portion where the first and second surfaces of different angles face each other, an inner bending part (21b) may be formed in the space portion between the adjacent inner first and second fixing parts (22b, 23b), that is, the space portion where the corner second barrier (30b) is exposed.

[0095] The inner folded portion (21b) may be made of low-density polyurethane foam, and on the outer surface folded at a certain angle, for example, 135 degrees, a secondary barrier (30) in which a corner secondary barrier (30b) and a corner connecting barrier (31b) are laminated may be provided.

[0096] These inner bends (21b) can perform the function of blocking heat intrusion from the outside by sealing the space between the outer first and second fixing parts (41b, 42b) that are adjacently placed when a plurality of corner blocks are placed adjacently, together with the corner connecting barrier (31b).

[0097] The corner secondary barrier (30b) can be provided on the outer side of the corner primary insulation wall (20b). The corner secondary barrier (30b) can be installed between the corner primary insulation wall (20b) and the corner secondary insulation wall (40b), and together with the corner primary barrier (10b), it can prevent liquefied gas from leaking out.

[0098] The corner secondary barrier (30b) is part of the corner block together with the corner primary insulation wall (20b) and the corner secondary insulation wall (40b). When the corner blocks are placed adjacently, the adjacent corner secondary barriers (30b) between the outer first and second fixing parts (41b, 42b) can be connected by the corner connecting barrier (31b).

[0099] The corner connecting barrier (31b) can connect adjacent corner secondary barriers (30b) that are exposed to the outside when corner blocks are placed adjacently, and has an inner bend (21b) installed on its upper side to seal the space between the inner bend (21b) and the outer first and second fixing parts (41b, 42b) placed adjacently, thereby blocking heat intrusion from the outside. In this embodiment, the corner connecting barrier (31b) can be formed to extend not only between the inner first and second fixing parts (22b, 23b) but also to a length that overlaps at least the inner first and second fixing parts (22b, 23b).

[0100] At the point where the outer first and second fixing parts (41b, 42b) meet, the corner secondary barrier (30b) and the corner connecting barrier (31b) are stacked, and the secondary barrier (30) can be arranged to be bent.

[0101] The corner secondary insulation wall (40b) may be positioned on the outer side of the corner secondary barrier (30b). The corner secondary insulation wall (40b) may be designed to block heat intrusion from the outside together with the corner primary insulation wall (20b) and the inner bend (21b), while withstanding impact from the outside or impact caused by liquefied gas sloshing from the inside. Additionally, the corner secondary insulation wall (40b) may be installed between the corner secondary barrier (30b) and the hull (2), and may be composed of inner plywood, insulation material, and outer plywood.

[0102] The corner secondary insulation wall (40b) may include an outer first fixing part (41b) and an outer second fixing part (42b) which are fixed to the inner sides of the first and second sides, respectively, and are configured with a structure in which inner plywood, insulation material, and outer plywood are sequentially stacked on the outer side of the corner secondary barrier (30b).

[0103] Here, the outer first fixing part (41b) is fixed to the inner side of the first surface, and the outer second fixing part (42b) can be fixed to the inner side of the second surface.

[0104] The side facing the outer first fixing part (41b) fixed to the first surface and the outer second fixing part (42b) fixed to the second surface may be inclined in a direction (ED) that evenly divides the corner portion. In this embodiment, the corner portion is described as being evenly divided, but it is not limited to this and may not be even depending on the corner position, so it is obvious that it may be inclined in a direction (ED) that unevenly divides the corner portion.

[0106] Meanwhile, the corner block and the flat block may be provided with a certain gap when installed on the hull (2). A leveling wedge (60) may be placed at least below the corner block among the flat block and the corner block. For example, the leveling wedge (60) may be placed below the corner block to support the corner block.

[0107] The leveling wedge (60) can level the corner block and the flat block by aligning their heights evenly. The leveling wedge (60) may include at least one of an adhesive member (50), such as plywood, metal, and mastic, and may be formed to have a rigid shape.

[0108] The thickness of the leveling wedge (60) can be set by taking into account the flatness of the plane on which the corner block is installed.

[0110] In the following, a method for manufacturing a liquefied gas storage tank according to an embodiment of the present invention is described with reference to FIGS. 5 to 7.

[0111] FIG. 5 is a drawing illustrating the state in which the center lines of each side of the space for wall installation of a liquefied gas storage tank according to one embodiment of the present invention are calculated, FIG. 6 is a cross-sectional view of the space for wall installation shown in FIG. 5, and FIG. 7 is a flowchart illustrating a method for manufacturing a liquefied gas storage tank according to one embodiment of the present invention.

[0112] Referring to FIGS. 5 to 7, the method for manufacturing a liquefied gas storage tank (1) may include a step of calculating the center line of each side (S110), a step of calculating the leveling wedge thickness of the corner block (S120), a step of determining a virtual plane on which a virtual panel is installed (S130), a step of marking the line after center line correction (S140), a step of installing the corner block (S150), and a step of installing the flat block (S160).

[0113] In the step of calculating the center line of each face (S110), the center line of each face of the space where the wall (100) of the liquefied gas storage tank (1) is formed can be calculated using a Marking Out Program. Here, the Marking Out Program can scan the interior of the space where the wall (100) is formed and calculate and output center line information for each face. Here, the center line information can be output as data related to the distance (d) from the corner reference point of each face, as shown in FIG. 5, and the center lines of faces that are connected to each other can be connected to each other.

[0114] In the step (S120) for calculating the thickness of the leveling wedge of the corner block, the flatness of two surfaces connected to mutually facing sides of one surface of the space where the wall (100) is formed, for example, the first surface (AA), for example, the second surface (BB) and the third surface (CC), can be measured to calculate the thickness of the first leveling wedge (LW1) and the second leveling wedge (LW2) at the bottom of the corner block that are placed at the corner portions of the second surface (BB) and the third surface (CC). Here, the flatness may indicate that the surface is more uniform as the numerical value is smaller. Additionally, the first leveling wedge (LW1) may be placed at the corner portion of the second surface (BB), and the second leveling wedge (LW2) may be placed at the corner portion of the third surface (CC).

[0115] In the virtual plane determination step (S130) in which virtual panels are installed, as shown in FIG. 6, a state in which the first virtual panel (VP1) and the second virtual panel (VP2) are installed on the second surface (BB) and the third surface (CC) is assumed by considering the thickness of the first leveling wedge (LW1) and the second leveling wedge (LW2), and the first virtual plane (VS1) and the second virtual plane (VS2) can be determined as surfaces facing the interior of the space where the walls (100) of the first virtual panel (VP1) and the second virtual panel (VP2) are formed.

[0116] After center line correction, in the marking line display step (S140), the center line (CL) of the first surface (AA) can be corrected using the distance between the first virtual plane and the second virtual plane (VS2), which are the surfaces of the first virtual panel (VP1) and the second virtual panel (VP2) of the second surface (BB) and the third surface (CC), and a marking line (ML) can be displayed on the first surface (AA) using the corrected center line (CL).

[0117] That is, depending on the thickness of the first leveling wedge (LW1) and the second leveling wedge (LW2), the marking line (ML) according to the center line of the actual first surface (AA) and the corrected center line may be the same or different.

[0118] If the thickness of the first leveling wedge (LW1) and the thickness of the second leveling wedge (LW2) are the same, the center line of the first surface (AA) and the marking line (ML) can coincide.

[0119] However, if the thickness of the first leveling wedge (LW1) and the thickness of the second leveling wedge (LW2) are different from each other, the marking line (ML) cannot coincide with the center line (CL) of the first surface (AA).

[0120] For example, if the thickness of the first leveling wedge (LW1) is greater than the thickness of the second leveling wedge (LW2), the marking line (ML) may be offset from the center line (CL) of the first surface (AA) toward the third surface (CC). Additionally, if the thickness of the second leveling wedge (LW2) is greater than the thickness of the first leveling wedge (LW1), the corrected center line (CL) may be offset from the center line (CL) of the first surface (AA) toward the second surface (BB).

[0121] By repeating the steps of calculating the center line of each face as described above (S110), calculating the leveling wedge thickness of the corner block (S120), determining the virtual plane on which the virtual panel is installed (S130), and, after correcting the center line, displaying the marking line (S140), a marking line (ML) corresponding to the corrected center line can be displayed on each face of the space where the wall (100) is formed.

[0122] In the corner block installation step (S150), a corner block illustrated in FIGS. 1 to 4 can be installed in the corner portion where the surfaces of the space where the wall (100) is formed are connected.

[0123] In the flat block installation step (S160), the flat blocks shown in FIGS. 1 to 4 can be installed using marking lines marked on each side of the space where the wall (100) is formed based on the corrected center line, thereby completing the wall (100) of the liquefied gas storage tank (1).

[0125] As described above, the method for manufacturing a liquefied gas storage tank (1) according to the present embodiment can correct a center line calculated by a marking-out program using the thicknesses of a first leveling wedge (LW1) and a second leveling wedge (LW2) calculated through flatness measurement, and can mark a marking line on a plurality of surfaces constituting the space where a wall (100) is formed using the corrected center line.

[0126] Therefore, it is possible to install the planar blocks and corner blocks constituting the wall (100) more precisely.

[0128] Hereinafter, with reference to FIGS. 8 to 10, a method for manufacturing a liquefied gas storage tank according to a second embodiment of the present invention will be described. The following description will focus on the differences between this embodiment and the previous embodiment, and any parts omitted from the description will be replaced by the previous content. It should be noted that this applies to other embodiments as well.

[0129] FIG. 8 is a drawing illustrating the state in which the center lines of each side of the space for wall installation of a liquefied gas storage tank according to a second embodiment of the present invention are calculated, FIG. 9 is a cross-sectional view of the space for wall installation shown in FIG. 8, and FIG. 10 is a flowchart illustrating a method for manufacturing a liquefied gas storage tank according to a second embodiment of the present invention.

[0130] Referring to FIGS. 8 to 10, the method for manufacturing a liquefied gas storage tank (1) may include a flatness measurement step of surface D (S210), a third leveling wedge calculation step of surface D (S220), a flatness measurement step of surface E (S230), a fourth leveling wedge thickness calculation step of surface E (S240), a corner block installation step (S250), and a flat block installation step (S260).

[0131] In the flatness measurement step (S210) of surface D, the flatness of one of the surfaces constituting the space where the wall (100) of the liquefied gas storage tank (1) is formed, for example, the fourth surface (DD), can be measured. In the leveling wedge thickness calculation step (S220) of surface D, the thickness of the third leveling wedge (LW3) provided at the bottom of the corner block placed at the corner portion of the fourth surface (DD) can be calculated by taking into account the measured flatness of the fourth surface (DD).

[0132] In the flatness measurement step (S230) of surface E, the flatness of the fifth surface (EE) that is in contact with the fourth surface (DD) at a certain angle can be measured.

[0133] In the step (S240) for calculating the thickness of the fourth leveling wedge of surface E, the thickness of the fourth leveling wedge (LW4) provided at the bottom of the corner block placed at the corner of the fifth surface (EE) can be calculated by considering the flatness of the fifth surface (EE), the angle formed by the fourth surface (DD) and the fifth surface (EE), and the thickness of the third leveling wedge (LW3). As shown in FIG. 9, the angle (α) formed by the fourth surface (DD) and the fifth surface (EE) and the angle (α) formed by the corner blocks of the fourth surface (DD) and the fifth surface (EE) can be substantially the same due to the calculated thickness of the fourth leveling wedge (LW4).

[0134] Generally, the thickness of the fourth leveling wedge (LW4) can be calculated by considering the flatness of the fifth surface (EE). However, if the thickness of the fourth leveling wedge (LW4) is calculated by considering only the flatness of the fifth surface (EE), a difference may occur between the angle formed by the fourth surface (DD) and the fifth surface (EE) and the angle formed by the corner blocks of the fourth surface (DD) and the fifth surface (EE). Therefore, as in the present embodiment, the thickness of the fourth leveling wedge (LW4) must be calculated by considering the flatness of the fifth surface (EE), the angle formed by the fourth surface (DD) and the fifth surface (EE), and the thickness of the third leveling wedge (LW3).

[0135] By repeating the flatness measurement step (S210) of surface D, the third leveling wedge calculation step (S220) of surface D, the flatness measurement step (S230) of surface E, and the fourth leveling wedge thickness calculation step (S240) of surface E as described above, the thickness of the leveling wedge provided at the corner of each surface of the space where the wall (100) is formed can be calculated.

[0136] In the corner block installation step (S250), the corner block illustrated in FIGS. 1 to 4 can be installed at the corner portion where the surfaces of the space where the wall (100) is formed are connected, using the third leveling wedge (LW3) and the fourth leveling wedge (LW4).

[0137] In the flat block installation step (S260), the flat blocks illustrated in FIGS. 1 to 4 are installed on each side of the space where the wall (100) is formed, thereby completing the wall of the liquefied gas storage tank (1).

[0139] As described above, the method for manufacturing a liquefied gas storage tank (1) according to the present embodiment can calculate the thickness of the fourth leveling wedge (LW4) by considering together the flatness of the fifth surface (EE), the angle formed by the fourth surface (DD) and the fifth surface (EE), and the thickness of the third leveling wedge (LW3), and can make the angle formed by the fourth surface (DD) and the fifth surface (EE) substantially the same as the angle formed by the corner blocks.

[0140] Therefore, it is possible to install the flat blocks and corner blocks constituting the wall (100) of the liquefied gas storage tank (1) more precisely.

[0142] In the following, a method for manufacturing a liquefied gas storage tank according to a third embodiment of the present invention is described with reference to FIGS. 8, 9, and 11.

[0143] FIG. 11 is a flowchart illustrating a method for manufacturing a liquefied gas storage tank according to a third embodiment of the present invention.

[0144] Referring to FIGS. 8, 9 and 11, a method for manufacturing a liquefied gas storage tank (1) may include a flatness measurement step of surface D (S310), a third leveling wedge calculation step of surface D (S320), a flatness measurement step of surface E (S330), a fourth leveling wedge thickness calculation step of surface E (S340), a third leveling wedge and fourth leveling wedge thickness correction step (S350), a corner block installation step (S360), and a flat block installation step (S370).

[0145] In the flatness measurement step (S310) of surface D, the flatness of one of the surfaces constituting the space where the wall (100) of the liquefied gas storage tank (1) is formed, for example, the fourth surface (DD), can be measured.

[0146] In the third leveling wedge calculation step (S320) of the D-side, the thickness of the third leveling wedge (LW3) provided at the bottom of the corner block placed at the corner of the fourth-side (DD) can be calculated by considering the measured flatness of the fourth-side (DD).

[0147] In the flatness measurement step (S330) of surface E, the flatness of the fifth surface (EE) that is in contact with the fourth surface (DD) at a certain angle can be measured.

[0148] In the step (S340) for calculating the thickness of the fourth leveling wedge of the E-side, the thickness of the fourth leveling wedge (LW4) provided at the bottom of the corner block placed at the corner of the fifth-side (EE) can be calculated by considering the flatness of the measured fifth-side (EE).

[0149] In the third leveling wedge and fourth leveling wedge thickness correction step (S350), the thicknesses of the third leveling wedge (LW3) and the fourth leveling wedge (LW4) can be determined by correcting the calculated thicknesses of the third leveling wedge (LW3) and the fourth leveling wedge (LW4) calculated according to the flatness of the fourth surface (DD) and the fifth surface (EE). For example, the thickness of the third leveling wedge (LW3) can be determined by correction based on the angle formed by the fourth surface (DD) and the fifth surface (EE), and the calculated thickness of the fourth leveling wedge (LW4) according to the flatness of the fifth surface (EE). Additionally, the thickness of the fourth leveling wedge (LW4) can be determined by correction based on the angle formed by the fourth surface (DD) and the fifth surface (EE), and the calculated thickness of the third leveling wedge (LW3) according to the flatness of the fourth surface (DD).

[0150] As illustrated in FIG. 9, by the thickness of the corrected third leveling wedge (LW3) and fourth leveling wedge (LW4), the angle formed by the fourth face (DD) and the fifth face (EE) and the angle formed by the corner blocks of the fourth face (DD) and the fifth face (EE) may be substantially the same.

[0151] Generally, the thickness of the third leveling wedge (LW3) and the fourth leveling wedge (LW4) can be calculated by considering the flatness of the fourth surface (DD) and the fifth surface (EE). However, if the thickness of the third leveling wedge (LW3) and the fourth leveling wedge (LW4) is determined by considering only the flatness of the fourth surface (DD) and the fifth surface (EE), a difference may occur between the angle formed by the fourth surface (DD) and the fifth surface (EE) and the angle formed by the corner blocks of the fourth surface (DD) and the fifth surface (EE). Therefore, as in the present embodiment, the thickness of the third leveling wedge (LW3) and the fourth leveling wedge (LW4) must be corrected by considering the angle formed by the fourth surface (DD) and the fifth surface (EE) and the calculated thickness of the third leveling wedge (LW3) and the fourth leveling wedge (LW4) according to the flatness.

[0152] By repeating the flatness measurement step (S310) of surface D, the third leveling wedge calculation step (S320) of surface D, the flatness measurement step (S330) of surface E, the fourth leveling wedge thickness calculation step (S340) of surface E, and the third leveling wedge and fourth leveling wedge thickness correction step (S350) as described above, the thickness of the leveling wedge provided at the corner of each surface of the space where the wall (100) is formed can be determined.

[0153] In the corner block installation step (S360), the corner block illustrated in FIGS. 1 to 4 can be installed at the corner portion where the surfaces of the space where the wall (100) is formed are connected, using the third leveling wedge (LW3) and the fourth leveling wedge (LW4).

[0154] In the flat block installation step (S370), the flat blocks shown in FIGS. 1 to 4 are installed on each side of the space where the wall (100) is formed, thereby completing the wall of the liquefied gas storage tank (1).

[0156] As described above, the manufacturing method of the liquefied gas storage tank (1) according to the present embodiment can determine the thickness of the third leveling wedge (LW3) and the fourth leveling wedge (LW4) by correcting the angle formed by the fourth surface (DD) and the fifth surface (EE), and the calculated thickness of the third leveling wedge (LW3) and the fourth leveling wedge (LW4) according to the flatness of the fourth surface (DD) and the fifth surface (EE).

[0157] Accordingly, by making the angle formed by the fourth side (DD) and the fifth side (EE) substantially the same as the angle formed by the corner blocks, it is possible to install the planar blocks and corner blocks constituting the wall (100) more precisely.

[0159] FIG. 12 is a drawing showing a leveling wedge, etc. of a liquefied gas storage tank according to a fourth embodiment of the present invention, and FIG. 13 is a flowchart for explaining a method of manufacturing a liquefied gas storage tank according to a fourth embodiment of the present invention.

[0161] Referring to FIG. 12 and FIG. 13, the method for manufacturing a liquefied gas storage tank (1) according to the fourth embodiment of the present invention can collectively calculate the thickness of leveling wedges (LW1, LW2) for corner portions and flat portions by considering the structure of the first surface (AA) and the second surface (BB) that are connected to each other.

[0162] The first surface (AA) and the second surface (BB) can be in contact with each other to form a wall (100). At this time, the first surface (AA), etc., has a peripheral part that is connected to another surface and a central part that is the remainder. For example, one side of the peripheral part of the first surface (AA) is connected to one side of the peripheral part of the second surface (BB). Therefore, the peripheral part can be referred to as a corner part, etc. Also, the central part of the first surface (AA) is a part that is not connected to another surface and can be referred to as a flat part.

[0163] Leveling wedges (LW1, LW2) are provided on the first surface (AA) and the second surface (BB) to support corner blocks or flat blocks. As previously mentioned, the leveling wedges (LW1, LW2) have the function of ensuring that the heights of the corner blocks and flat blocks are leveled.

[0164] The first surface (AA) or the second surface (BB) is not a component manufactured as a single unit in one go, but is a part formed by joining multiple blocks that make up the hull together by welding. At this time, due to factors such as deformation or tolerances caused by welding, the first surface (AA) or the second surface (BB), etc., may not be a perfect flat surface without partial curvature.

[0165] Ideally, it is desirable to form a wall (100) by extending a vertical plane from a corner point without curvature, as shown by the reference line (RL) in FIG. 13. However, in reality, there is bound to be partial error in the inner and outer directions relative to the reference line (RL) in the first plane (AA), etc.

[0166] At this time, leveling wedges (LW1, LW2) are provided to compensate for these partial differences. That is, by installing a plurality of leveling wedges (LW1, LW2) having the same or different thicknesses on the first surface (AA), etc., the flat blocks and corner blocks fixed to the first surface (AA) are provided without a large step difference between them. This can ultimately ensure the sealing function of the primary barrier (10).

[0167] However, the process of determining the thickness of the leveling wedges (LW1, LW2) in this embodiment is explained below using a comparative example. It should be noted that the comparative example does not represent a known technology and may be included in an embodiment of the present invention.

[0168] For the comparative example, the error with respect to the reference line (RL), i.e., the flatness, is measured for the first surface (AA). Subsequently, the thickness of a plurality of leveling wedges (LW1, LW2) to be installed on the first surface (AA) can be calculated automatically or manually.

[0169] The comparative example can calculate the thickness of all leveling wedges (LW1, LW2) that must be installed in the central part of at least the first surface (AA) all at once, and based on this, determine the thickness of the leveling wedges (LW1, LW2) that must be installed in the peripheral part of the first surface (AA).

[0170] However, corner blocks are provided in the periphery of the first surface (AA), and a single corner block is not installed solely by the leveling wedges (LW1, LW2) provided in the periphery of the first surface (AA), but is also used for fixing by the leveling wedges (LW1, LW2) provided in the periphery of the second surface (BB).

[0171] Therefore, the determination of the thickness of the leveling wedges (LW1, LW2) for the peripheral portion of the first surface (AA) may take into account the peripheral portion of the second surface (BB). However, the thickness of the leveling wedges (LW1, LW2) for the central portion of the first surface (AA) may be determined without considering the second surface (BB). Therefore, after determining the thickness of the leveling wedges (LW1, LW2) for the peripheral portion of the first surface (AA), the thickness of the leveling wedges (LW1, LW2) already determined for the central portion of the first surface (AA) may need to be modified.

[0172] That is, according to the comparative example, after calculating the thickness of the leveling wedges (LW1, LW2) for the central part of the first surface (AA), the thickness of the leveling wedges (LW1, LW2) for the peripheral part of the first surface (AA) is determined, and subsequently, the thickness of the leveling wedges (LW1, LW2) for the central part of the first surface (AA) is directly modified on-site.

[0173] Therefore, the comparative example has a problem in that, when determining the thickness of the leveling wedges (LW1, LW2), the corner blocks installed across the first surface (AA) and the second surface (BB) are not properly considered, which necessitates modifying the thickness of the leveling wedges (LW1, LW2) calculated for the first surface (AA), thereby consuming a large amount of labor.

[0174] In contrast, the embodiment described below considers the leveling wedges (LW1, LW2) on which corner blocks are to be installed and the leveling wedges (LW1, LW2) on which flat blocks are to be installed in combination, and calculates the thickness of all leveling wedges (LW1, LW2) to be installed in the central and surrounding areas of the first surface (AA) all at once. Through this, the embodiment eliminates the need to adjust the thickness of the leveling wedges (LW1, LW2) that have already been calculated.

[0175] Specifically, the present embodiment measures the first surface (AA) and the second surface (BB) that are connected to each other (S410). In particular, the present embodiment can measure the flatness of the first surface (AA) and the second surface (BB) that are connected to each other among the surfaces of the space where the wall (100) is formed. Various equipment such as a laser or a camera can be used to measure the flatness, and the flatness may refer to the degree of curvature of the first surface (AA), etc., relative to the reference line (RL).

[0176] Subsequently, the present embodiment calculates the thickness of the first leveling wedge (LW1) at the portion connecting the first surface (AA) and the second surface (BB) (S420). That is, the present embodiment calculates the thickness of the first leveling wedge (LW1) to be placed at the corner portion as the portion connecting the first surface (AA) and the second surface (BB).

[0177] The first leveling wedge (LW1) may be provided at least in the periphery of the first surface (AA). It may also include being provided in the periphery of the second surface (BB). The first leveling wedge (LW1) may be for fixing a corner block to be installed in the corner portion formed by the first surface (AA) and the second surface (BB).

[0178] Since the first surface (AA) and the second surface (BB) are connected with one edge between them, the first leveling wedge (LW1) may include a plurality of leveling wedges (LW1, LW2) provided on both sides of the edge. For example, the first leveling wedge (LW1) includes one provided on the first surface (AA) on one side of the edge and one provided on the second surface (BB) on the other side of the edge.

[0179] The corner block installed by the first leveling wedge (LW1) has an outer surface fixed to the wall (100) that is bent to correspond to the angle formed by the connection of the first surface (AA) and the second surface (BB). Specifically, the corner block may have a shape in which one side is fixed to the first surface (AA) and the other side is fixed to the second surface (BB), and is bent to correspond to the angle between the first surface (AA) and the second surface (BB) between the one side and the other side.

[0180] In this embodiment, the thickness of the first leveling wedge (LW1) is calculated, and then the thickness of the second leveling wedge (LW2) for the first surface (AA) or the second surface (BB) is calculated (S430). In this embodiment, the thickness of the second leveling wedge (LW2) to be placed in a portion not connected to the other surface on at least one of the first surface (AA) or the second surface (BB), that is, in the central portion of the first surface (AA) or the central portion of the second surface (BB), can be calculated.

[0181] The second leveling wedge (LW2) may be installed on a flat portion. In contrast, the aforementioned first leveling wedge (LW1) may be referred to as being installed on a corner portion.

[0182] A flat block can be fixed to the central part of the first surface (AA) by a second leveling wedge (LW2). Multiple flat blocks are installed adjacent to each other on at least one of the first surface (AA) and the second surface (BB).

[0183] The thickness of the second leveling wedge (LW2) is calculated such that the angle formed by the outer or inner surface of a plurality of adjacent flat blocks is within a reference value. This allows the primary barrier (10), which is provided to connect the plurality of flat blocks, to have sufficient sealing power.

[0184] Furthermore, in this embodiment, the step of calculating the thickness of the first leveling wedge (LW1) and the step of calculating the thickness of the second leveling wedge (LW2) can be performed simultaneously. In this case, the thicknesses of the first leveling wedge (LW1) and the second leveling wedge (LW2) can be calculated such that the angle formed between one side of the corner block and the outer or inner surface of the flat block adjacent to one side of the corner block is within a reference value. At the same time, the thicknesses of the first leveling wedge (LW1) and the second leveling wedge (LW2) can be calculated such that the angle formed between the other side of the corner block and the outer or inner surface of the flat block adjacent to the other side of the corner block is within a reference value.

[0185] In the former case, it means that the thickness is calculated integrally for the first leveling wedge (LW1) provided in the peripheral part of the first surface (AA) and the second leveling wedge (LW2) provided in the central part of the first surface (AA). In the latter case, it means that the thickness is calculated integrally for the first leveling wedge (LW1) provided in the peripheral part of the second surface (BB) and the second leveling wedge (LW2) provided in the central part of the second surface (BB).

[0186] Accordingly, in this embodiment, for the first and second faces (AA, BB) including corner and central portions, the thickness of the first leveling wedge (LW1) to be provided in the corner portion of each face and the second leveling wedge (LW2) to be provided in the central portion of each face are calculated collectively, thereby allowing subsequent work such as adjusting the thickness of the leveling wedges (LW1, LW2) during installation work, as described in the comparative example, to be omitted.

[0187] In particular, to this end, the present embodiment may allow the step of calculating the thickness of the first leveling wedge (LW1) and the step of calculating the thickness of the second leveling wedge (LW2) to be performed simultaneously. Accordingly, the present embodiment calculates the thickness of the leveling wedges (LW1, LW2) at once for the first and second surfaces connected to each other with the corner side in between, for the corner portion and the flat portion.

[0188] The present embodiment further includes the step (S440) of installing a corner block using the first leveling wedge (LW1) after the thicknesses of the leveling wedges (LW1, LW2) have all been calculated. The corner block is provided on the edge and can be installed on the first leveling wedge (LW1) of the first surface (AA) and the second leveling wedge (LW2) of the second surface (BB).

[0189] In addition, the present embodiment further includes the step (S450) of installing a flat block using a second leveling wedge (LW2). The flat block can be fixed to each surface using a second leveling wedge (LW2) provided on the first surface (AA) or a second leveling wedge (LW2) provided on the second surface (BB).

[0191] The present invention is not limited to the embodiments described above, and it is obvious that new embodiments may include a combination of at least two of the above embodiments or a combination of at least one of the above embodiments and known technology.

[0192] Although the present invention has been described in detail through specific embodiments, this is for the purpose of specifically explaining the invention, and the invention is not limited thereto. It will be apparent that modifications or improvements can be made by those skilled in the art within the technical scope of the invention.

[0193] All simple variations or modifications of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be clarified by the appended claims. Explanation of the symbols

[0194] 1: Liquefied gas storage tank 1a: Bottom surface 2: Hull 10: Primary Barrier 10a: Planar primary barrier 10b: Corner primary barrier 20: Primary insulation wall 20a: Planar primary insulation wall 20b: Corner primary insulation wall 21, 21a: Connecting insulation wall 21b: Inner bent portion 22b: Inner first fixing portion 23b: Inner second fixation part 30: Secondary barrier 30a: Planar secondary barrier 30b: Corner secondary barrier 31a: Planar connection barrier 31b: Corner connection barrier 40: Secondary insulation wall 40a: Flat secondary insulation wall 40b: Corner secondary insulation wall 41b: Outer first fixing part 42b: Outer second fixing part 50: Adhesive member 60: Leveling Wedge LW1~LW4: Leveling Wedges 1~4

Claims

Claim 1 A method for manufacturing a liquefied gas storage tank forming a space closed by a wall comprising a flat block and a corner block, comprising: a first step of measuring the flatness of a first surface and a second surface that are connected to each other among the surfaces of the space in which the wall is formed; and a second step of calculating the thickness of a first leveling wedge to be placed at the corner portion where the first surface and the second surface are connected.The method includes a third step of calculating the thickness of a second leveling wedge to be disposed on a planar portion that is not connected to the other surface on at least one of the first surface or the second surface, wherein the first surface and the second surface are connected to each other with one corner side in between, and the first leveling wedge includes a plurality of leveling wedges provided on both sides of the corner side, and the thickness of the first leveling wedge and the second leveling wedge is calculated such that the angle formed between one side of the corner block and the outer or inner surface of the planar block adjacent to one side of the corner block is within a reference value in order to integrally calculate the thickness of the first leveling wedge provided on the peripheral portion of the first surface and the second leveling wedge provided on the central portion of the first surface, and at the same time, the angle formed between the other side of the corner block and the planar portion adjacent to the other side of the corner block is calculated such that the angle is within a reference value, and the thickness of the first leveling wedge provided on the peripheral portion of the second surface and the second leveling wedge provided on the central portion of the second surface is calculated such that the angle formed between the other side of the corner block and the planar portion adjacent to the other side of the corner block A method for manufacturing a liquefied gas storage tank, comprising: a step of installing the corner block using the first leveling wedge and installing the flat block using the second leveling wedge without adjusting the thickness of the leveling wedge already calculated for the first surface and the second surface, wherein the angle formed by the outer or inner surface of the block is calculated to be within the reference value, and the thickness of the second leveling wedge to be provided at the corner portion of each surface and the thickness of the second leveling wedge to be provided at the central portion of each surface are calculated collectively for the first surface and the second surface. Claim 2 delete Claim 3 A method for manufacturing a liquefied gas storage tank according to claim 1, wherein a plurality of planar blocks are installed adjacent to each other on at least one of the first surface and the second surface. Claim 4 delete Claim 5 A method for manufacturing a liquefied gas storage tank according to claim 1, wherein the corner block has an outer surface fixed to the wall by a leveling wedge that is bent to correspond to the angle formed by the connection of the first surface and the second surface. Claim 6 A method for manufacturing a liquefied gas storage tank according to claim 5, wherein the corner block has one side fixed to the first surface and the other side fixed to the second surface, and has a bent shape between the one side and the other side to correspond to the angle between the first surface and the second surface. Claim 7 delete Claim 8 delete Claim 9 A liquefied gas storage tank manufactured through the method of manufacturing the liquefied gas storage tank of any one of claims 1, 3, 5, and 6. Claim 10 A vessel having the above-mentioned liquefied gas storage tank of claim 9.

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