Scaffold structure for insulation in liquefied natural gas cargo tanks

Abstract

The present invention relates to a scaffolding structure provided on an inner wall surface of a cargo hold in order to construct an inner thermal insulation layer of the cargo hold and a method of installing the same, the structure comprising: a plurality of standard modules enlarged in a modular form in an inner space of the cargo hold and having an upper portion or a lower portion, a plurality of struts coupled to the upper portion or the lower portion in order to form a plurality of floor surfaces; and a plurality of cantilever modules enlarged in a modular form in order to be coupled to one side of each of the plurality of standard modules and thus adjacent to the inner wall surface of the cargo hold.

Description

TECHNICAL FIELD

[0001] The present application relates to a scaffold structure, and more particularly, to a scaffold structure for insulation work in an LNG cargo hold, which is capable of installing or dismounting a scaffold structure inside an LNG cargo hold to reduce manual labor and working hours when constructing an insulation layer in the LNG cargo hold, and a method for installing and dismounting the same. BACKGROUND

[0002] With recent strengthening of regulations on environmental pollution of ships, environmentally friendly and efficient fuels such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG) have attracted increasing attention in the field.

[0003] Liquefied natural gas is a fuel obtained by cooling and liquefying methane extracted from a gas field through refining, and liquefied petroleum gas is a fuel obtained by compressing a gas consisting mainly of propane and butane, which are extracted together with oil from an oil field, into a liquid at room temperature.

[0004] Specifically, liquefied natural gas (hereinafter referred to as LNG) is obtained by cooling natural gas to an extremely low temperature (about -163°C), and is suitable for long-distance transportation at sea because the volume of LNG is about 1 / 600 of the volume of natural gas in a gaseous state.

[0005] An LNG carrier designed to transport LNG to a demand source on shore at sea, or an LNG regasification vessel (LNG RV) designed to transport LNG to a demand source on shore at sea and discharge LNG to a demand source on shore by regasifying LNG, is provided with an LNG cargo hold capable of withstanding the low temperature of LNG.

[0006] Like the LNG carrier and the LNG RV, such an LNG cargo hold is provided to an LNG-FPSO (floating production storage and offloading) that produces natural gas at sea in a liquefied state, stores the liquefied natural gas in the cargo hold, and, if necessary, unloads the LNG to an LNG carrier, or to an LNG-FSRU that stores LNG unloaded from the LNG carrier in a cargo hold at sea and, if necessary, regasifies the LNG and supplies the regasified LNG to a demand source on shore.

[0007] Depending on whether a thermal insulator for storing LNG in a low-temperature state is directly applied to the cargo, such an LNG cargo hold can be classified into a membrane type LNG hold and an independent type hold.

[0008] The membrane type holds are classified into a 96-hold and a Mark III hold, and the independent type cargo holds are classified into a MOSS hold as a spherical type hold and an SPB hold as a prismatic type hold.

[0009] Figure 1 is a schematic view of a typical cargo hold.

[0010] Reference Figure 1 The cargo hold 10 includes a bottom block 11 constituting a bottom of a hull and a bottom of the cargo hold 10, and a side shell block 12 coupled to both side ends of the bottom block 11 in a transverse direction of the bottom block 11 to constitute a side wall of the hull and the cargo hold 10.

[0011] A hold deck block 13 is coupled to an upper end of the side shell block 12 to seal an inner space of the cargo hold 10 while constituting a ceiling wall of the cargo hold 10.

[0012] Although not shown in the drawing, a separate partition wall block can be coupled to both side ends of the bottom block 11 in a longitudinal direction of the bottom block 11. With this structure, the cargo hold 10 can have a single closed inner space.

[0013] On the other hand, a separate insulation layer IL is formed on the inner wall of the cargo hold 10. To construct the insulation layer IL, a separate scaffolding structure 30 is installed inside the cargo hold 10.

[0014] Prior documents of the present invention include Korean Patent Publication No. 10-1083440, Korean Patent Publication No. 10-1526369, Korean Patent Publication No. 10-1526370, and similar Korean Patent Publications. SUMMARY

[0015] TECHNICAL PROBLEM

[0016] A conventional scaffolding structure is installed by connecting steel pipe members each having a rectangular or circular pipe shape to each other using bolts and nuts or a latch within a manual operation range of a worker.

[0017] For disassembly of such a structure, each of the scaffolding members constituting the scaffolding structure is disassembled, and the scaffolding floors are disassembled one by one from the uppermost floor to the lowermost floor using an elevator (car size: 3 x 1 square meters) installed inside the cargo hold. Since each of the scaffolding members constituting the scaffolding structure is a single-piece product having a considerable weight, installation or disassembly of each of the scaffolding members results in an increase in working time and working schedule, resulting in a decrease in work efficiency and an increase in the incidence of musculoskeletal disorders and various work accidents.

[0018] Further, due to the limitations of the size of the cabin of the elevator and the allowable weight of the cabin, there are many limitations on the size of the scaffold member, and a change in the design size of the cabin or the insulation system requires a change in the installation position of the scaffold structure and the arrangement of the scaffold member depending on the shape or size of the cabin, and it can be difficult to use the existing scaffold member.

[0019] Further, the typical scaffold structure can be subjected to twisting or bending, and provides many limitations on the installation and operation of the machine automation equipment. In particular, the scaffold disposed in the corner region can be subjected to sagging, resulting in a high risk of accidents caused by the falling of the worker or the scaffold member.

[0020] Embodiments of the present invention provide a scaffold structure for insulation operation in an LNG cargo hold and a method of installation and disassembly thereof, in which the scaffold structure is partially modularized to a larger size to allow the installation or disassembly of the scaffold structure inside the LNG cargo hold to reduce manual labor and working time when constructing an insulation layer in the LNG cargo hold.

[0021] Technical Solution

[0022] According to an aspect of the present invention, there is provided a scaffold structure installed in an internal space of a cargo hold for constructing an insulation layer in the cargo hold, the scaffold structure including: a plurality of standard modules modularized to a larger size in the internal space of the cargo hold and coupled to a plurality of pillars at an upper portion or a lower portion of the scaffold structure to form a plurality of floor surfaces; and a plurality of cantilever modules modularized to a larger size and coupled to one side of each of the plurality of standard modules to be adjacent to an inner wall of the cargo hold.

[0023] Each of the standard modules can include: a pair of main frames spaced apart from each other in one direction; a pair of connection frames coupled to opposite ends of the main frames to integrally connect the pair of main frames; and a plurality of connection members disposed between the pair of main frames to be spaced apart from each other in a longitudinal direction of the main frames and parallel to the connection frames.

[0024] Each of the main frames can include: a pair of vertical members having the same outer diameter as the pillars; a first horizontal member extending horizontally in a direction in which the pair of vertical members face each other; a second horizontal member having the same length as the first horizontal member and spaced apart downward from the first horizontal member, the second horizontal member being connected to outer peripheral surfaces of the pair of vertical members at opposite ends thereof; and a plurality of inclined members disposed between the first horizontal member and the second horizontal member.

[0025] Each of the main frames can include a pair of flange portions protruding from an outer peripheral surface of one of the pair of vertical members in a direction opposite to a direction in which the pair of vertical members face each other, each of the flange portions having a flange-shaped distal end, and a socket portion formed by enlarging a diameter of a distal end of each of the vertical members and having an inner diameter corresponding to an outer diameter of the strut to accommodate the strut inserted therein.

[0026] The scaffold structure can further include a diagonal brace diagonally connecting one of the plurality of standard modules constituting the plurality of floors to another standard module disposed above or below the one standard module.

[0027] The diagonal brace can be coupled to a corner of the scaffold structure at opposite ends thereof, at which the second horizontal member meets the vertical member and the bracket formed on the outer peripheral surface of the socket portion, respectively.

[0028] Each of the cantilever modules can include a pair of sub-frames spaced apart from each other in one direction, and a plurality of support members disposed between the pair of sub-frames to integrally connect the pair of sub-frames to each other and couple the pair of sub-frames to each other in a longitudinal direction of the sub-frames.

[0029] Each of the sub-frames can include an upper suspension member extending in a horizontal direction, a lower suspension member spaced downward from the suspension member, and a plurality of diagonal brace members disposed between the upper suspension member and the lower suspension member to connect the upper suspension member to the lower suspension member.

[0030] Each of the flange portions can include an upper protrusion protruding from an upper outer peripheral surface of the vertical member and coupled to one end of the upper suspension member, and a lower protrusion protruding from a lower outer peripheral surface of the vertical member to be spaced downward from the upper protrusion and coupled to one end of the lower suspension member.

[0031] One end of each of the upper suspension member and the lower suspension member can have a flange shape corresponding to a distal end of the upper protrusion or the lower protrusion.

[0032] The scaffold structure can further include a transport structure provided to an upper center of the cargo hold and transporting the plurality of standard modules and the plurality of cantilever modules to a lower portion of the cargo hold when the scaffold structure is disassembled, and a module landing portion disposed to face the center of the cargo hold from the standard modules on opposite side walls of the center of the cargo hold in a cross section of the cargo hold and provided to a landing area of the plurality of standard modules and the plurality of cantilever modules when the scaffold structure is disassembled using the transport structure.

[0033] The scaffold structure can further include: a plurality of longitudinal cantilever modules modularized to a larger size and coupled to another side of the standard modules to be adjacent to the inner wall of the cargo hold from a corner of the cargo hold; and a plurality of section members each disposed between the cantilever modules and the longitudinal cantilever modules to connect the cantilever modules to the longitudinal cantilever modules and placed to be adjacent to the corner of the cargo hold.

[0034] Each of the longitudinal cantilever modules can include: a pair of second sub-frames having a shorter length than the first sub-frames and spaced apart from each other; a middle abutment disposed in the middle of and extending parallel to the pair of second sub-frames; and a plurality of second support members disposed between the pair of second sub-frames and the middle abutment to connect the pair of second sub-frames to the middle abutment so as to support the scaffold boards.

[0035] The scaffold structure can further include: at least one reinforcement truss disposed at a corner of the cargo hold and coupled to the standard modules and the cantilever modules to prevent the main frame from bending and twisting; and a sag prevention column coupled to one side of the plurality of section members or the cantilever modules to prevent the plurality of section members from sagging.

[0036] According to another aspect of the present invention, there is provided a method of installing a scaffold structure in an internal space of a cargo hold for constructing an insulation layer in the cargo hold, the method including: installing a plurality of standard modules at a position spaced apart from an inner wall of the cargo hold, each of the plurality of standard modules being modularized to a larger size; coupling a strut to the standard modules at an upper portion or a lower portion of the scaffold structure to form a plurality of floors; and installing a plurality of cantilever modules at one side of the plurality of standard modules to be adjacent to the inner wall of the cargo hold, each of the plurality of cantilever modules being modularized to a larger size.

[0037] The method can further include: installing a plurality of longitudinal cantilever modules at another side of the plurality of standard modules to be adjacent to the inner wall of the cargo hold from a corner of the internal space of the cargo hold, each of the plurality of longitudinal cantilever modules being modularized to a larger size; and installing a plurality of section members between the cantilever modules and the longitudinal cantilever modules to connect the cantilever modules to the longitudinal cantilever modules and adjacent to the corner of the cargo hold.

[0038] The method can further include: coupling at least one reinforcement truss to the standard modules and the cantilever modules so as to prevent the standard modules and the cantilever modules from being deformed by bending and twisting at a corner of the cargo hold; and coupling a sag prevention column to one side of the plurality of section members or the cantilever modules to prevent the plurality of section members from sagging.

[0039] Advantageous effects

[0040] Embodiments of the present invention provide a scaffold structure which is partially modularized to a larger size to allow installation or disassembly of the scaffold structure inside an LNG cargo tank to reduce manual labor and working hours when constructing an insulation layer in the LNG cargo tank.

[0041] Further, each of the standard modules and the cantilever modules modularized to the larger size can be conveniently disassembled by workers using separate disassembly devices, thereby preventing musculoskeletal diseases of the workers while reducing the risk of various accidents by minimizing manual labor and heavy lifting during the process of installing or disassembling the scaffold structure.

[0042] Further, each of the plurality of standard modules and the plurality of cantilever modules has a truss structure, thereby ensuring convenient assembly and installation by reducing the weight of the scaffold structure while improving structural stability of the scaffold structure against vertical bending or torsional deformation.

[0043] Further, when applied to cargo tanks having different sizes, the scaffold structure can allow changing the length of a plurality of distance adjustment parts in order to ensure continuous use of the standard modules and the cantilever modules modularized to certain sizes by inner fill adjustment units each connecting one of the plurality of cantilever modules to another cantilever module adjacent thereto, thereby ensuring application of the scaffold structure to other ships.

[0044] Further, the scaffold structure can further include a sag prevention column or a reinforcing truss in a corner region of the cargo tank in which the scaffold structure can be subjected to torsion or bending, thereby preventing sagging of deformation of the scaffold structure at a distal end thereof. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a schematic view of a typical cargo tank.

[0046] Figure 2 is a schematic view of a scaffold structure for insulation work in an LNG cargo tank according to an embodiment of the present invention.

[0047] Figure 3 is a schematic cross-sectional view of a cargo tank provided with a conveyance structure for disassembling a scaffold structure according to an embodiment of the present invention.

[0048] Figure 4 is Figure 3 is a modified perspective view of the conveyance structure shown in

[0049] Figure 5 is a schematic cross-sectional view of a cargo tank showing a rotation prevention unit further added to the conveyance structure shown in Figure 3

[0050] Figure 6 is Figure 5 ​Modified perspective view of the transport structure shown in

[0051] Figure 7 To show the use Figure 5 View of the method of disassembly of the scaffold structure shown in

[0052] Figure 8 Perspective view of the scaffold structure for the insulation operation in an LNG cargo tank according to an embodiment of the application.

[0053] Figure 9 To Figure 8 Schematic side view of the scaffold structure shown in

[0054] Figure 10 To Figure 8 Enlarged view of zone A of

[0055] Figure 11 To Figure 8 Enlarged view of zone B of

[0056] Figure 12 To Figure 8 Enlarged view of zone C of

[0057] Figure 13 To Figure 8 Perspective view of the standard module shown in

[0058] Figure 14 To Figure 13 Side view of the scaffold structure shown in

[0059] Figure 15 To show some of the processes in the method of disassembly of the scaffold structure according to an embodiment of the application.

[0060] Figure 16 To Figure 3 Schematic cross-sectional view of the scaffold structure taken along the line X-X' of

[0061] Figure 17 Perspective view of the scaffold structure of Figure 16 installed at a corner of the internal space of the cargo tank.

[0062] Figure 18 To Figure 17 Bottom perspective view of the scaffold structure shown in

[0063] Figure 19 To Figure 18 Enlarged view of zone D of

[0064] BRIEF DESCRIPTION OF THE DRAWINGS

[0065] 10: cargo tank;

[0066] 10a: side opening;

[0067] 11: bottom block;

[0068] 12: side housing block;

[0069] 13: Container deck block;

[0070] 30: Scaffolding structure;

[0071] 100: standard module;

[0072] 110: main frame;

[0073] 111: vertical component;

[0074] 112: first horizontal component;

[0075] 113: second horizontal component;

[0076] 114: tilting component;

[0077] 115: socket part;

[0078] 117: transverse flange portion;

[0079] 117a: upper protrusion;

[0080] 117b: lower protrusion;

[0081] 130: connection frame;

[0082] 150: connecting parts;

[0083] 170: Safety guardrail;

[0084] 200: cantilever module;

[0085] 210: subframe;

[0086] 211: first upper suspension component;

[0087] 213: first lower suspension component;

[0088] 215: first diagonal bracing member;

[0089] 230: first supporting member;

[0090] 310: Pillar;

[0091] 311: female socket part;

[0092] 330: diagonal brace;

[0093] 350: platform structure;

[0094] 351: Upper bridge deck;

[0095] 353: Lower bridge deck;

[0096] 370: Support structure;

[0097] 371: support unit;

[0098] 390: lateral distance adjustment unit;

[0099] 391: distance adjustment component;

[0100] 400: conveying structure;

[0101] 410: module conveyor;

[0102] 411: Monorail platform;

[0103] 413: Monorail;

[0104] 415: Overhead monorail crane;

[0105] 430: Connecting the mast;

[0106] 431: base mast component;

[0107] 433: Connecting mast components;

[0108] 435: Extended mast component;

[0109] 450: anti-rotation unit;

[0110] 451: contact parts;

[0111] 500: module landing section;

[0112] 610: Horizontal infill adjustment unit;

[0113] 611: lateral distance adjustment component;

[0114] 611a: Wedge-shaped fixed pin;

[0115] 630: ladder structure;

[0116] 650: elevator;

[0117] 700: longitudinal cantilever module;

[0118] 710: second subframe;

[0119] 711: second upper suspension component;

[0120] 713: second lower suspension component;

[0121] 715: second plurality of diagonal brace members

[0122] 730: second plurality of support members

[0123] 750: intermediate docking member

[0124] 810: longitudinal inner fill adjustment unit

[0125] 830: corner connection portion

[0126] 831, 832, 833, 834, 835: segment members

[0127] 850: sag prevention post

[0128] 870: stiffening truss

[0129] 871: horizontal stiffening member

[0130] 873: diagonal stiffening member

[0131] A, B, C, D: zones

[0132] c1: frame coupler

[0133] c3: support rod coupler

[0134] c4: fixed pin coupler

[0135] c5: cradle

[0136] Gd: gas storage cap

[0137] IL: insulation layer

[0138] Mc: mobile cart

[0139] MS: main structure

[0140] P1: scaffold board

[0141] Td: upper tank deck

[0142] W: wire

[0143] X-X': line DETAILED DESCRIPTION

[0144] The above and other aspects, features, and advantages of the present application will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate several embodiments of the application.

[0145] Embodiments of the present application will be described with reference to the accompanying drawings. It should be noted that like components will be designated by like reference numerals throughout the drawings and the specification. Also, description of known functions and configurations incorporated herein can be omitted for the sake of clarity and conciseness. In addition, description of known functions and configurations incorporated herein can be omitted for the sake of clarity and conciseness. Exemplary embodiments of the present application will be described in detail herein below with reference to the accompanying drawings. However, it should be understood that these embodiments are not to be construed as limiting the present application in any manner and that various modifications, changes, alterations, and equivalent embodiments can be made by those skilled in the art without departing from the spirit and scope of the present application.

[0146] Figure 2 a schematic cross-sectional view of a cargo hold provided with a transport structure for dismounting a scaffold structure according to an embodiment of the present application, and Figure 3 a schematic cross-sectional view of a cargo hold provided with a transport structure for dismounting a scaffold structure according to an embodiment of the present application, and Figure 4 a Figure 3 a modified perspective view of the transport structure shown in

[0147] Furthermore, Figure 5 a schematic cross-sectional view of a cargo hold provided with a transport structure for dismounting a scaffold structure according to an embodiment of the present application, and Figure 3 a schematic cross-sectional view of a cargo hold provided with a transport structure for dismounting a scaffold structure according to an embodiment of the present application, and Figure 6 a Figure 5 a modified perspective view of the transport structure shown in Figure 7 a schematic cross-sectional view of a cargo hold provided with a transport structure for dismounting a scaffold structure according to an embodiment of the present application, and Figure 5 a schematic cross-sectional view of a cargo hold provided with a transport structure for dismounting a scaffold structure according to an embodiment of the present application, and

[0148] First, with reference to the cross-section of the cargo hold shown in Figures 2 to 3 a schematic cross-sectional view of a cargo hold provided with a transport structure for dismounting a scaffold structure according to an embodiment of the present application, and

[0149] The scaffold structure for insulation operation in an LNG cargo hold according to an embodiment of the present application is a scaffold structure for constructing an insulation layer in a cargo hold 10. With reference to the cross-section of the cargo hold 10 shown in Figures 2 to 3 a schematic cross-sectional view of a cargo hold provided with a transport structure for dismounting a scaffold structure according to an embodiment of the present application, and

[0150] With reference to Figure 2 and Figure 3 , according to this embodiment, each of the main structures MS can include a plurality of standard modules 100 and a plurality of cantilever modules 200 coupled to one side or the other side of each of the plurality of standard modules 100.

[0151] In this embodiment, each of the plurality of standard modules 100 and the plurality of cantilever modules 200 is modularized to a larger size, and can be disassembled using a separate disassembling device such as a machine automation device.

[0152] The standard modules 100 are coupled to the upper or lower portions of the plurality of columns 310 at positions spaced apart from the opposite inner side walls of the cargo hold 10 to form a plurality of floors, and serve to structurally support the cantilever modules 200 described below.

[0153] In this embodiment, at least some of the plurality of standard modules 100 can have a truss structure in order to achieve a weight reduction of the scaffolding structure while ensuring structural stability to withstand vertical bending deformation.

[0154] The columns 310 can be coupled to opposite ends of the standard modules 100 and extend from the standard modules 100 in an upward or downward direction, and the plurality of standard modules 100 and the plurality of cantilever modules 200 coupled to one side or the other side of the plurality of standard modules 100 can constitute a plurality of floors held by the columns 310 and are spaced apart from each other at a constant interval in an upward or downward direction inside the cargo hold 10.

[0155] By increasing or decreasing the number of floors (e.g., from 9 floors to 10 floors) depending on the height of the cargo hold 10 to which the scaffolding structure is to be installed or simply increasing or decreasing the length of the columns 310, the scaffolding structure for thermal insulation operation in an LNG cargo hold according to the embodiment can be easily applied to other ships.

[0156] As shown in FIGS. 1 to 3, the scaffolding structure for thermal insulation operation in an LNG cargo hold according to the embodiment can include a main structure MS including a plurality of standard modules 100 and a plurality of columns 310, and a plurality of cantilever modules 200 coupled to one side or the other side of the plurality of standard modules 100. Figure 2 and Figure 3 As shown in FIGS. 1 to 3, the scaffolding structure for thermal insulation operation in an LNG cargo hold according to the embodiment can include a main structure MS including a plurality of standard modules 100 and a plurality of columns 310, and a plurality of cantilever modules 200 coupled to one side or the other side of the plurality of standard modules 100.

[0157] The diagonal braces 330 serve to minimize torsion and deformation of the entire main structure MS constituted by the plurality of standard modules 100 and the plurality of cantilever modules 200, and can increase the structural rigidity and strength of the main structure MS as well as the columns 310.

[0158] The cantilever modules 200 are coupled to one side or the other side of the corresponding standard modules 100 to be adjacent to the opposite inner side walls of the cargo hold 10 to have a cantilever shape not coupled to the columns 310, and can be provided at a main site where installation of a thermal insulation material is performed on the inner walls of the cargo hold 10.

[0159] Similar to the standard modules 100, some of the plurality of cantilever modules 200 can have a truss structure in order to achieve a weight reduction of the scaffolding structure while ensuring structural stability.

[0160] The scaffold structure for insulation operation in the LNG cargo hold according to the embodiment is partially modularized to a larger size to allow installation or dismounting of the scaffold structure inside the cargo hold 10 to reduce manual labor and working hours when constructing the insulation layer in the cargo hold 10.

[0161] Further, the scaffold structure according to the embodiment can provide an advantageous effect of preventing musculoskeletal diseases of workers while reducing the risk of various accidents by minimizing manual labor and heavy lifting in the process of installing or dismounting the scaffold structure.

[0162] The platform structure 350 extends between the main structures MS in the lateral direction and is provided in the form of a bridge having a long span without a separate lower support structure. The platform structure 350 can serve as a storage site for insulation material used to construct an insulation layer inside the cargo hold 10, or as a site for a pre-treatment operation.

[0163] The platform structure 350 can include an upper bridge deck 351 disposed between the uppermost floors of the main structures MS, each of which constitutes a plurality of floors, and a lower bridge deck 353 disposed below the upper bridge deck 351.

[0164] Referring to Figure 2 and Figure 3 , according to this embodiment, the main structures MS can form 10 floors including the bottom of the cargo hold 10 in the upward and downward directions inside the cargo hold 10 by coupling between the plurality of standard modules 100 and the columns 310, and the upper bridge deck 351 and the lower bridge deck 353 are disposed to be parallel to the uppermost floor and the third floor of the main structures MS in the lateral direction, respectively.

[0165] The lower bridge deck 353 is disposed to be parallel to the third floor of the main structures MS and allows access to a side opening 10a (see Figure 7 ) formed on one sidewall of the cargo hold 10, so as to serve as a stock delivery deck for delivering the plurality of standard modules 100 and the plurality of cantilever modules to the outside of the cargo hold 10 when installing or dismounting the scaffold structure.

[0166] The support structure 370 is disposed on the bottom surface of the cargo hold 10 to support the main structures MS and can include a plurality of support units 371 supported on the bottom surface of the cargo hold 10.

[0167] Each of the plurality of support units 371 can be primarily disposed on the bottom surface of the cargo hold 10 to support the corresponding main structure MS (see Figure 2 ), and can be secondarily supported on the insulation layer formed on the bottom surface of the cargo hold 10 (see Figure 3 ) after constructing the insulation layer.

[0168] Here, each of the plurality of support units 371 can be configured to allow height adjustment, so that the total load of the scaffold structure including the main structure MS can be uniformly delivered to the bottom surface of the cargo hold 10 or via the same to the insulation layer formed on the bottom surface of the cargo hold 10, thereby preventing damage to the insulation layer due to excessive load of the scaffold structure.

[0169] In this embodiment, the installation position of the support structure 370 can be freely adjusted according to the size of the cargo hold 10 or the insulation system provided to the cargo hold 10.

[0170] The scaffold structure for insulation operation in an LNG cargo hold according to the embodiment can further include lateral distance adjustment units 390 disposed at opposite ends of the platform structure 350, respectively, to connect the platform structure 350 to the main structure MS and adjust the distance between the main structure MS and the platform structure 350.

[0171] As shown in Figure 2 and Figure 3 , each of the lateral distance adjustment units 390 can include a plurality of distance adjustment members 391 connecting the main structure MS to the platform structure 350 in a horizontal direction or in a diagonal direction, so that the lateral distance between the main structure MS and the platform structure 350 can be adjusted by changing the length of each of the distance adjustment members 391.

[0172] In this embodiment, since the portion between the main structure MS and the platform structure 350 can be difficult to modularize due to its structural characteristics, each of the plurality of distance adjustment members 391 can be prepared as a single-piece product to be installed or disassembled by manual labor.

[0173] In the scaffold structure for insulation operation in an LNG cargo hold according to the embodiment, the lateral distance adjustment units 390 are disposed between each of the main structures MS and the platform structure 350 to allow continuous use of the standard module 100 and the cantilever module 200 modularized to certain sizes by adjusting the length of each of the plurality of distance adjustment members 391 even when applied to cargo holds 10 having different sizes, thereby ensuring application of the scaffold structure to other ships.

[0174] Next, a method of installing a scaffold structure according to an embodiment of the present application will be simply described with reference to the cross-section of the cargo hold shown in Figure 2 and Figure 3 .

[0175] The method of installing a scaffold structure for insulation operation in an LNG cargo tank according to the embodiment of the present application includes installing support structures 370 on a bottom surface of the cargo tank 10, installing main structures MS on the support structures 370, each of the main structures MS constituting a plurality of floors, and installing platform structures 350 between the main structures MS, wherein the platform structures 350 have a truss structure and extend in a transverse direction.

[0176] In this embodiment, the step of installing the main structures MS can include installing a plurality of standard modules 100 at positions spaced apart from opposite inner side walls of the cargo tank 10, coupling a plurality of columns 310 to the plurality of standard modules 100 at an upper portion or a lower portion of the scaffold structure to form a plurality of floors, installing diagonal braces 330 to connect one of the plurality of standard modules 100 to another standard module 100 disposed above or below the one standard module 100 in a diagonal direction, and installing a plurality of cantilever modules 200 at one side or the other side of the plurality of standard modules 100 to be adjacent to the opposite inner side walls of the cargo tank 10.

[0177] On the other hand, referring to Figure 3 , the scaffold structure according to the embodiment can further include a transport structure 400 provided to an upper center of the cargo tank 10 for disassembling the scaffold structure, and a module landing portion 500 provided to landing areas of the plurality of standard modules 100 and the plurality of cantilever modules 200 when the scaffold structure is disassembled using the transport structure 400.

[0178] In this embodiment, referring to the cross section of the cargo tank 10 shown in Figure 3 , the module landing portion 500 can be disposed to move from the main structures MS, i.e., from the standard modules 100 on the opposite side walls of the cargo tank 10, toward a center of the cargo tank 10, and can form a plurality of floors.

[0179] Like the main structures MS, the module landing portion 500 can be constituted by a plurality of standard modules 100, columns 310 coupled to the standard modules 100 at an upper portion or a lower portion of the scaffold structure, and diagonal braces 330.

[0180] Next, the transport structure 400 according to the embodiment will be described with reference to Figures 3 to 7 .

[0181] Referring to Figure 3, the transport structure 400 is disposed to the upper center of the cargo hold 10 to transport the plurality of standard modules 100 and the plurality of cantilever modules 200 to the lower bridging deck 353 upon disassembly of the scaffold structure, and can include: a module transporter 410 disposed at the upper center of the cargo hold 10 in the cross section of the cargo hold 10 and including a plurality of monorails 413; and a connecting mast 430 connecting the module transporter 410 to the upper tank deck Td of the cargo hold 10.

[0182] The module transporter 410 can be disposed at the upper center of the cargo hold 10 in the cross section of the cargo hold 10, and can be used to lower the plurality of standard modules 100 and the plurality of cantilever modules 200 to the lower portion of the cargo hold 10 or to lift the plurality of standard modules 100 and the plurality of cantilever modules 200 to the upper portion of the cargo hold 10.

[0183] Specifically, the module transporter 410 can include: a monorail platform 411 disposed at the upper center of the cargo hold 10 in the cross section of the cargo hold 10 and extending in the lateral direction; monorails or runway beams 413 coupled to the lower portion of the monorail platform 411; and a plurality of overhead monorail cranes 415 slidable in the longitudinal direction of the monorails 413.

[0184] The monorail platform 411 can be provided by welding or bolting a plurality of steel pipes having a circular or square shape in the horizontal direction, the vertical direction, and the diagonal direction.

[0185] In this embodiment, the monorail platform 411 can be pre-disposed in the uppermost floor of the scaffold structure when constructing the thermal insulation layer in the cargo hold 10.

[0186] That is, after forming a separate groove structure inside the upper bridging deck 351 constituting the uppermost floor of the scaffold structure, the monorail platform 411 is placed thereon as part of the uppermost floor of the scaffold structure.

[0187] In this embodiment, the monorail platform 411 can be divided into a suitable size so as to be moved outside the cargo hold 10 through the side opening 10a formed at one side of the cargo hold 10 after completion of disassembly of the scaffold structure.

[0188] The monorails 413 can be coupled to the lower side of the monorail platform 411 to provide a path along which the overhead monorail cranes 415 described below slide.

[0189] The overhead monorail cranes 415 slide in the longitudinal direction of the monorails 413 between the opposite ends of the monorails 413 and the center of the monorails 413 to transport the standard modules 100 or the cantilever modules 200, which are modularized to a large size and have a heavy weight of about 600 kg, to the lower bridging deck 353 disposed at the third floor of the scaffold structure.

[0190] Here, the transport structure 400 can further have a lifting unit that lifts or lowers the module transporter 410 disposed inside the cargo hold 10 (i.e., on the upper bridge deck 351) to be connected to the connection mast 430.

[0191] As an example, the lifting unit can be a plurality of wires W (see Figure 4 ) or a crane connected to or supported by the connection mast 430 described below.

[0192] In this embodiment, upon starting the disassembly of the scaffold structure, the lifting unit can be connected to the monorail platform 411 at the uppermost floor of the scaffold structure to support the monorail platform 411 and allow stable support of the connection mast 340 even when the uppermost floor of the scaffold structure is removed.

[0193] Upon completion of the disassembly of the scaffold structure, the monorail platform 411 can be lowered to the lower portion of the cargo hold 10 by the lifting unit.

[0194] In the module transporter 410 according to this embodiment, the monorail platform 411 can have an overhead monorail crane 415 at each of opposite sides thereof in the longitudinal direction thereof, respectively. Preferably, the monorail platform 411 has a plurality of overhead monorail cranes 415 at each of the opposite sides thereof to reduce the time for disassembling the scaffold structure.

[0195] As an example, as shown in Figure 4 , the monorail platform 411 can be formed to have predetermined lengths in the longitudinal direction and the transverse direction of the cargo hold, respectively, four monorails 413 can be provided to the lower side of the monorail platform 411 to be spaced apart therefrom in the longitudinal direction and the transverse direction, and the overhead monorail cranes 415 can be provided to slide on the plurality of monorails 413, respectively.

[0196] In this embodiment, since the monorail platform 411 has four monorails 413, four plural standard modules 100 or four plural cantilever modules 200 disassembled from the scaffold structure can be lowered to the lower bridge deck 353 at the same time, thereby reducing the time for disassembling the scaffold structure.

[0197] The overhead monorail cranes 415 provided to each of the plurality of monorails 413 can be individually controlled to lift or lower an object such as a standard module 100 or a cantilever module 200 to the upper portion or the lower portion of the cargo hold 10. Preferably, in order to prevent load bias to one side of the monorail platform 411, the overhead monorail cranes 415 are controlled to perform lifting or lowering operations on the monorails 413 at the same time.

[0198] The connection mast 430 serves to support the module transporter 410 and can extend from the inside of the gas storage cover Gd in the upper tank deck Td of the cargo hold 10 to the inside of the cargo hold 10.

[0199] Specifically, as shown in Figure 3 and Figure 4 The connection mast 430 can include a plurality of base mast parts 431 disposed inside the gas storage cover Gd and extending in the longitudinal direction of the gas storage cover Gd, a plurality of connection mast parts 433 connecting the plurality of base mast parts 431 to each other in the longitudinal direction, the lateral direction, and the diagonal direction, and a plurality of extension mast parts 435 diagonally extending from lower ends of the plurality of base mast parts 431 to the inside of the cargo compartment 10, respectively, and connected to the monorail platform 411 of the module conveyor 410.

[0200] Each of the plurality of base mast parts 431 can be coupled to the inside of the gas storage cover Gd at an upper end thereof and to one side of the upper portion of the cargo compartment 10 at a lower end thereof by welding or bolt fastening, and can be connected to a hatch of the gas storage cover Gd at the upper end thereof.

[0201] Preferably, the plurality of base mast parts 431 are connected to the gas storage cover Gd so as not to obstruct the opening of the hatch of the gas storage cover Gd.

[0202] After the connection mast 430 is installed inside the gas storage cover Gd, the connection mast 430 can be inserted into the gas storage cover Gd using a separate inner wall crane (not shown) disposed outside the cargo compartment 10, and after the disassembly of the scaffold structure is completed, the module conveyor 410 can be separated from the connection mast 430, which is moved outside the gas storage cover Gd using the inner wall crane.

[0203] In this embodiment, although the conveyance structure 400 has a structure in which the monorail platform 411 is supported by the connection mast 430, the monorail platform 411 can be vulnerable to stress applied in a direction biased from the center of the monorail platform 411.

[0204] When a load is biased to one side of the monorail platform 411, the monorail platform 411 can be tilted or rotated in the direction in which the load is applied, and the connection mast 430 connected to the monorail platform 411 can be damaged, or the monorail platform 411 can be separated from the connection mast 430 and fall from the connection mast 430.

[0205] As shown in Figure 5 and Figure 6 In order to prevent the monorail platform 411 from being tilted or rotated, the conveyance structure 400 according to this embodiment can further be provided with a rotation prevention unit 450 extending upward from an upper side of the monorail platform 411 and having an upper end closely contacting the upper inner wall of the cargo compartment 10.

[0206] The anti-rotation unit 450 can include a plurality of contact members 451 which are spaced apart from each other on the monorail platform 411 in the longitudinal direction and the lateral direction.

[0207] Each of the contact members 451 can prevent the monorail platform 411 from tilting or rotating by compressing the upper inner wall of the cargo hold 10 when an asymmetric load is applied to the monorail platform 411.

[0208] Here, the thermal insulation layer is formed on the upper inner wall of the cargo hold 10 and can be damaged by local stress. Therefore, in order to minimize damage to the inner wall or the thermal insulation layer of the cargo hold 10 due to the compression force of the anti-rotation unit 450, each of the contact members 451 has an upper end having a greater width than a lower end thereof to make surface-to-surface contact with the upper inner wall or the thermal insulation layer surface of the cargo hold 10.

[0209] In this embodiment, each of the contact members 451 can have a cylindrical or polygonal shape, and is preferably implemented by a steel pipe like the monorail platform 411.

[0210] For the contact member 451 having a hollow pipe shape, a separate plate (not shown in the drawings) having a predetermined area can be coupled to the upper end of the anti-rotation member 450 by welding or bolt fastening.

[0211] Reference Figure 6 According to this embodiment, four contact members 451 are provided to the four corners of the monorail platform 411, respectively. However, it should be understood that the installation position and the number of the contact members 451 are not limited thereto. The monorail platform 411 can be provided with a plurality of contact members at each end thereof, and the anti-rotation unit can have various other structures as long as the anti-rotation unit can prevent the monorail platform 411 from tilting or rotating.

[0212] Next, a method of disassembling the scaffold structure using the transport structure 400 will be simply described.

[0213] The method of disassembling the scaffold structure for the thermal insulation operation in the LNG cargo hold according to the embodiment of the present application includes installing the transport structure 400 at the upper center of the cargo hold 10 to transport a plurality of standard modules 100 and a plurality of cantilever modules 200, connecting the standard modules 100 or the cantilever modules 200 to the transport structure 400, then transporting the standard modules 100 or the cantilever modules 200 to the lower portion of the cargo hold 10, and transporting the standard modules 100 and the cantilever modules 200 transported to the lower bridged deck 353 to the outside of the cargo hold 10 through the opening 10a disposed at one side of the cargo hold 10.

[0214] The step of installing the conveyance structure 400 can include installing the connection mast 430 inside the gas storage cover Gd of the cargo hold 10 and connecting the module conveyor 410 including a plurality of monorails 413 to the connection mast 430 using a separate lifting unit (e.g., wire W and the like) to the lower side of the connection mast 430.

[0215] In the step of connecting the module conveyor 410, in the case where the lifting unit for lifting or lowering the module conveyor 410 is provided to the lower side of the connection mast 430, the monorail platform 411 disposed on the uppermost scaffold among the scaffolds inside the cargo hold 10 is lifted and connected to the connection mast 430.

[0216] The method can further include, before the step of conveying the standard modules 100 or the cantilever modules 200 to the lower bridged deck 353 in the cargo hold 10, conveying a plurality of standard modules 100 and a plurality of cantilever modules 200 to the center of the cargo hold 10 (at which the conveyance structure 400 is installed) using a separate disassembly unit.

[0217] That is, a certain portion of the scaffold structure can be disassembled inside the cargo hold 10, and the disassembled standard modules 100 or cantilever modules 200a can be moved to the module landing portion 500 to be connected to the overhead monorail crane 415 of the conveyance structure 400.

[0218] The method of disassembling the scaffold structure according to the embodiment can further include, after the disassembly of the scaffold structure is completed using the conveyance structure 400, separating the module conveyor 410 from the connection mast 430, and then moving the module conveyor 410 outside the cargo hold 10.

[0219] In other words, in the step of separating the module conveyor 410, the module conveyor 410 can be moved to the lower bridged deck 353 using the lifting unit provided to the lower side of the connection mast 430, disassembled on the lower bridged deck 353, and moved outside the cargo hold 10 through the side opening formed at one side of the cargo hold 10.

[0220] The connection mast 430 from which the module conveyor 410 is removed can be moved outside the gas storage cover Gd using an inner wall crane.

[0221] In the method of disassembling the scaffold structure according to the embodiment, the module conveyor 410 disposed inside the cargo hold 10 can be used to convey some portions of the scaffold structure modularized to a larger size, thereby substantially reducing the time required to disassemble the scaffold structure.

[0222] Figure 8 a perspective view of a scaffold structure for insulation operation in an LNG cargo hold according to an embodiment of the present application, Figure 9 a perspective view of a scaffold structure for insulation operation in an LNG cargo hold according to an embodiment of the present application, Figure 8 a schematic side view of the scaffold structure shown in FIG. 1, andFigures 10 to 12 for Figure 8 Magnified images of areas A, B, and C.

[0223] Figures 13 to 14 Shows the loading structure Figure 8 Standard modules, Figure 15 is a diagram illustrating some processes in a method of dismantling a scaffold structure according to an embodiment, and Figure 16 To follow Figure 3 Schematic cross-sectional view of the scaffold structure taken along line XX'.

[0224] As described above, the scaffolding structure for insulation operation in an LNG cargo tank according to an embodiment is a scaffolding structure for constructing an insulation layer in the cargo tank 10, and may include a plurality of standard modules 100 separated from the inner wall of the cargo tank 10 and constituting a plurality of bottom surfaces, and a plurality of cantilever modules 200 arranged adjacent to the inner wall of the cargo tank 10 and respectively connected to the plurality of standard modules 100.

[0225] Hereinafter, the plurality of standard modules 100 and the plurality of cantilever modules 200 will be described in detail.

[0226] refer to Figure 8 Each of the standard modules 100 includes: a pair of main frames 110, which are spaced apart from each other in one direction; a pair of connecting frames 130, which are connected to opposite ends of the main frames 110 to integrally connect the pair of main frames 110; and a plurality of connecting members 150, which are arranged between the pair of main frames 110 to be spaced apart from each other in the longitudinal direction of the main frames 110 and parallel to the connecting frames 130.

[0227] The pair of main frames 110 are coupled to the pair of connecting frames 130 to form a rectangular frame, and scaffolding boards are seated on upper surfaces of the main frames 110 , the connecting frames 130 , and the connecting members 150 .

[0228] The scaffolding boards may be formed from plywood sheets or steel sheets. Preferably, the scaffolding boards are fastened to the standard modules 100 to be integrated with the standard modules 100.

[0229] Furthermore, the scaffolding board may be formed of a single sheet having the same or similar size as the standardized size of the standard module 100, or may be composed of a plurality of sheets having a constant size or various sizes and fastened to scaffolding fixtures (not shown) respectively formed on the standard modules 100.

[0230] Here, if Figure 8 and Figure 9As shown in the middle, each of the main frames 110 can have a truss structure to achieve weight reduction of the scaffold structure while ensuring structural stability of the scaffold structure to withstand vertical bending deformation, and each of the connection frames 130 and the plurality of connection members 150 can be implemented by a rectangular steel pipe (or an angle pipe) having a rectangular cross section.

[0231] Specifically, each of the main frames 110 can include a pair of vertical members 111 coupled to the columns 310, a first horizontal member 112 extending horizontally in a direction in which the pair of vertical members 111 face each other, a second horizontal member 113 having the same length as the first horizontal member 112, the second horizontal member 113 being spaced apart downward from each of the first horizontal members 112 and connected to outer peripheral surfaces of the pair of vertical members 111 at opposite ends thereof, and a plurality of inclined members 114 disposed between the first horizontal member 112 and the second horizontal member 113.

[0232] Each of the vertical members 111 can be implemented by a circular steel pipe having the same outer diameter as the struts 310, and a frame coupler c1 can be formed at one side of an outer peripheral surface of the vertical member 111, so that each of the pair of connection frames 130 can be coupled to the vertical member 111 at one end thereof by bolt fastening.

[0233] Similar to the connection frames 130, the plurality of connection members 150 can be coupled to a plurality of connection bar couplers (not shown) which are spaced apart from each other along a length of the first horizontal member 112 in a direction in which the pair of main frames 110 face each other by bolt fastening.

[0234] In this embodiment, preferably, the vertical members 111, the first horizontal member 112, the second horizontal member 113, and the inclined members 114 are integrally connected to each other by bolt fastening or welding.

[0235] Except for the vertical members 111, the first horizontal member 112, the second horizontal member 113, and the plurality of inclined members 114 can be implemented by steel pipes each having a rectangular pipe shape with a rectangular cross section, similar to the connection frames 130 or the connection members 150.

[0236] Here, the first horizontal member 112, the second horizontal member 113, and the inclined members 114 can have different cross-sectional areas. For example, the first horizontal member 112 can have the same cross-sectional area as the connection frames 130 or the connection members 150, and the second horizontal member 113 and the inclined members 114 can be implemented by steel pipes each having a smaller cross-sectional area than the first horizontal member 112.

[0237] Reference Figure 9According to this embodiment, each of the main frames 110 may further include a socket portion 115, which is formed by enlarging the diameter of the upper end or the lower end of the vertical member 111 and has an inner diameter corresponding to the outer diameter of the pillar 310 to accommodate one end of the pillar 310 inserted therein, and the pillar 310 can be fastened to the standard module 100 by fastening a bolt to the socket portion 310 in a vertical direction relative to the outer peripheral surface of the socket portion 115, wherein one end of the pillar 310 is inserted into the socket portion 115.

[0238] With one end of each of the pillars 310 inserted into the socket portion 115, the pillar 310 can extend in the upward direction or downward direction of the standard module 100, and multiple standard modules 100 and multiple cantilever modules respectively connected to one side of the multiple standard modules 100 can form multiple bottom surfaces arranged at constant intervals in the upward direction and the downward direction inside the cargo hold 10 through the pillars 310.

[0239] Similar to the socket portion 115 formed at one end of the vertical member 111, each of the pillars 310 can be formed with a female socket portion 311 at the other end thereof by enlarging the diameter of the other end of the pillar 310 to have an inner diameter corresponding to the outer diameter of the vertical member 111 to accommodate one end of the vertical member 111 therein.

[0240] like Figure 13 and Figure 14 As shown in , the standard modules 100 according to this embodiment can be loaded onto a plurality of bottom surfaces through the socket portions 115 , wherein the standard modules 100 are separated from the pillars 310 , thereby minimizing the loading space of the standard modules 100 in an open storage place when installing and disassembling the scaffolding structure.

[0241] like Figure 10 As shown in , each of the main frames 110 may further include a pair of lateral flange portions 117 which protrude from the outer peripheral surface of one of the pair of vertical members 111 opposite to the direction in which the pair of vertical members face each other and each have a flange-shaped distal end.

[0242] The pair of lateral flange portions 117 may include an upper protrusion 117 a protruding from an upper outer peripheral surface of the vertical member 111 , and a lower protrusion 117 b protruding from a lower outer peripheral surface of the vertical member 111 to be spaced downwardly from the upper protrusion 117 a .

[0243] Here, similar to the contact part 451 of the delivery structure 400 , each of the upper protrusion 117 a and the lower protrusion 117 b may be coupled at a distal end thereof to a separate plate (not shown) having a predetermined area by bolting or welding to form a flange.

[0244] Further, although not shown in the drawings, each of the main frames 110 can further include a pair of longitudinal flange portions (not shown in the drawings) protruding from an outer peripheral surface of one of the pair of vertical members 111 opposite to a direction in which the connecting frame 130 is connected to the vertical members 111, i.e., from a portion of the outer peripheral surface of the vertical member 111 perpendicular to the lateral flange portion 117, and each having a flange-shaped distal end.

[0245] In this embodiment, the lateral flange portion 117 and the longitudinal flange portion are provided to couple the cantilever module to the standard module 100. Details of a coupling structure thereof to the cantilever module 200 will be described below.

[0246] Experiments for evaluating the maximum load capacity and structural stability of the standard module 100 according to a change in floor height were performed under different load conditions applied to the standard module 100, which is a main component of a scaffold structure for insulation operation in an LNG cargo tank according to the embodiment.

[0247] In this experiment, each of the cantilever modules 200 has a standard size, i.e., a width of about 2,500 mm and a length of about 3,700 mm, and it is assumed that a load of 250 kg / m2per unit area of each cantilever module 200 is applied.

[0248] Further, it is assumed that a load of 2 tons is transferred from the superstructure to each of the pair of columns 310 provided to the other side of each of the standard modules 100 coupled to the cantilever module 200 at one side thereof. The experiments were performed under various conditions of the load applied to the cantilever module 200 by operation of a machine automation device.

[0249] Table 1 shows load conditions of cases 1 to 4 in the experiment.

[0250] [Table 1]

[0251]

[0252] As shown in Table 1, the experiment was performed as follows: under a condition in which the load is distributed on the standard module 100 due to the cantilever module 200 (case 1 in Table 1); under a condition in which the load is concentrated on a central portion of each of three first support members 230 among the plurality of first support members 230 from a free end of the cantilever module 200 in a longitudinal direction (case 2 in Table 1); under a condition in which the load is applied to a point corresponding to 1 / 3 of a length of each of the three first support members 230 and to a point corresponding to 2 / 3 of the length in a longitudinal direction thereof (case 3 in Table 1); and under a condition in which the load is concentrated on distal ends of the pair of first upper hanging members 211 (case 4 in Table 1).

[0253] It is assumed that the machine automation equipment (i.e., the disassembling device) has a load of 3 tons, and the load is uniformly applied to the portion in Cases 2 to 4.

[0254] Further, when a load of 250 kg / m2 per cantilever module 200 unit area is applied, it can be seen that a distributed load of 2.3 tons (250 kg / m2*2.5 m*3.7 m = 2312.5 kg) is applied to the standard module 100 due to the cantilever module 200.

[0255] Since the structural analysis is performed under the conditions of Table 1, Cases 1 to 4, the maximum load capacity of the standard module 100 and the maximum sag length at the free end of the cantilever module 200 are obtained as shown in Table 2.

[0256] [Table 2]

[0257] Class Case 1 Case 2 Case 3 Case 4 Maximum UC 0.58 0.75 0.87 0.94 Maximum sag length 21 mm 23 mm 23 mm 31 mm

[0258] The strength of each of the components constituting the scaffold structure according to this embodiment is determined based on the actual results of the structural analysis, and the strength must be less than the nominal strength.

[0259] In Table 2, the utilization capacity (UC) is obtained by dividing the strength of each of the components by the nominal strength. The UC value of 1 or less indicates that the scaffold structure has stability in terms of strength, and the UV value greater than 1 indicates that the scaffold structure does not have stability in terms of strength.

[0260] Further, when the maximum sag length at the free end of the cantilever module 200 is 34 mm or less, it can be determined that the scaffold structure has structural stability, and in Cases 1 to 4, the maximum UC is 1 or less, and the maximum sag length at the free end of the cantilever module 200 is 34 mm or less, thereby indicating that the scaffold structure has structural stability.

[0261] In this experiment, the strength of the changed base height support 310 was evaluated under the same load conditions using existing components, and the UC of the changed base height support 310 is shown in Table 3.

[0262] [Table 3]

[0263] Floor height 2.75m 3.47m 4.0m 4.5m Maximum UC 0.445 0.548 0.719 0.957

[0264] Referring to Table 3, for the base height in the range of 2.75 m to 4.5 m under the same load conditions, the maximum UC value is 1 or less. Therefore, it can be determined that the scaffold structure has stability.

[0265] In a comprehensive assessment of the above results of the experiment, it can be seen that the scaffold structure for the insulation operation in the LNG cargo hold according to the embodiment has structural stability compared to a conventional system scaffold (a total of 9 floors) having a maximum floor height of 3.47 meters, and can maintain structural stability even when the floor height is changed to at most 4.5 meters.

[0266] The scaffold structure for the insulation operation in the LNG cargo hold according to the embodiment can maintain stability even when the length of the strut 310 is changed to at most 4.5 meters according to the height of the cargo hold 10 equipped with the scaffold structure, and thus can be easily applied to other ships.

[0267] According to this embodiment, the standard module 100 can further be equipped with a safety guardrail (or railing) 170 at the edges of the scaffold board P1, i.e., on the outer surface of the main frame 110 or the connection frame 130 having a rectangular frame structure, in order to secure the safety of workers.

[0268] According to this embodiment, the safety guardrail 170 can be provided to one side of the main frame 110 or the connection frame 130 of the standard module 100 to be foldable, so that each of the safety guardrails 170 can be folded and placed on the upper surface of the scaffold board of the standard module 100 when the standard module 100 is loaded, as shown in Figure 13 .

[0269] In the plan view of the cargo hold 10 shown in Figure 16 , each of the cantilever modules 200 can be a transverse cantilever module disposed to be close to the inner wall of the cargo hold 10 at the starboard side or the port side thereof, and the scaffold structure according to this embodiment can further include a longitudinal cantilever module 700 disposed to be close to the inner wall of the cargo hold 10 at the bow side or the stern side.

[0270] In the following description, the transverse cantilever module 200 will be described first, and then the longitudinal cantilever module 700 will be described with reference to Figure 8 and Figure 9 .

[0271] With reference to Figure 8 , the transverse cantilever module 200 can include a pair of first sub-frames 210 spaced apart from each other in one direction, and a plurality of first support members 230 disposed between the pair of first sub-frames 210 and integrally connecting the pair of first sub-frames 210 to each other.

[0272] Similar to the standard module 100, in the transverse cantilever module 200 according to this embodiment, the scaffold board can be fastened to the upper surfaces of the pair of first sub-frames 210 and the plurality of first support members 230, and can be integrally formed with the transverse cantilever module.

[0273] Similar to the main frame 110 of the standard module 100, to achieve weight reduction and improvement of structural stability of the scaffold structure, the pair of first sub-frames 210 can have a truss structure, and each of the plurality of first support members 230 can be implemented by a rectangular steel pipe having a rectangular cross section.

[0274] Each of the first sub-frames 210 can include a first upper suspension member 211 extending in a horizontal direction, a first lower suspension member 213 spaced downward from the first upper suspension member 211, and a plurality of first diagonal brace members 215 disposed between the first upper suspension member 211 and the first lower suspension member 213 to connect the upper suspension member 211 to the lower suspension member 213.

[0275] The first upper suspension member 211 can be implemented by a rectangular steel pipe having the same cross-sectional area as the first support member 230, and each of the first lower suspension member 213 and the first diagonal brace member 215 can be implemented by a rectangular steel pipe having a smaller cross-sectional area than the first upper suspension member 211.

[0276] The plurality of first support members 230 can be coupled to a plurality of support bar couplers c3 disposed apart from each other along the length of the first upper suspension member 211 in a direction in which the pair of first sub-frames 210 face each other by bolt fastening.

[0277] In this embodiment, preferably, the first upper suspension member 211, the first lower suspension member 213, and the plurality of first diagonal brace members 215 are integrally connected to each other by bolt fastening or welding.

[0278] The first upper suspension member 211 and the first lower suspension member 213 can have one end having a flange shape having a distal end corresponding to the upper protrusion portion 117a and the lower protrusion portion 117b formed on the lateral flange portion 117 on the main frame 110, respectively.

[0279] In this embodiment, one end of each of the first upper suspension member 211 and the first lower suspension member 213 is coupled to a separate plate (not shown) to form a flange by bolt fastening or welding, the separate plate having an area corresponding to the flange formed on the upper protrusion portion 117a or the lower protrusion portion 117b of the lateral flange portion 117.

[0280] That is, according to this embodiment, the transverse cantilever module 200 can be connected to the first sub-frame 210 by fastening one end of each of the first upper suspension member 211 and the first lower suspension member 213 to the upper protrusion 117a or the lower protrusion 117b of the transverse flange portion 117 using bolts, with the flange inserted therebetween, whereby the weight of the transverse cantilever module 200 realized in the cantilever shape and load applied to the transverse cantilever module 200 during the insulation operation of the cargo hold 10 can be delivered to the standard module 100 while minimizing the sagging at the distal end of the transverse cantilever module 200.

[0281] Here, the first lower suspension member 213 may have a shorter length than the first upper suspension member 211 , and thus the lateral cantilever module 200 may have a downward tapered side surface at a distal end thereof.

[0282] On the other hand, Figure 16 In the plane of the cargo hold 10 shown in , the main structure MS according to the embodiment may further include a plurality of transverse infill adjustment units 610, each of the plurality of transverse infill adjustment units 610 being arranged between two adjacent transverse cantilever modules 200 to connect one of the plurality of transverse cantilever modules 200 to another transverse cantilever module 200 adjacent thereto, so as to surround the inner wall of the cargo hold 10 together with the plurality of transverse cantilever modules 200.

[0283] In addition, the main structure MS according to the embodiment may further include a plurality of longitudinal infill adjustment units 810, each of which is disposed between two adjacent longitudinal cantilever modules 700 to connect one of the plurality of longitudinal cantilever modules 700 to another longitudinal cantilever module 700 adjacent thereto, so as to surround the inner wall of the cargo hold 10 together with the plurality of transverse cantilever modules 200, the plurality of longitudinal cantilever modules 700, and the plurality of transverse infill adjustment units 610. The transverse infill adjustment units 610 will be described below together with the longitudinal cantilever modules 700.

[0284] refer to Figure 9 , the lateral infill adjustment unit 610 may include a plurality of lateral distance adjustment units 611 having a rod shape and respectively coupled to the pair of first sub-frames 210 in directions opposite to the direction in which the pair of first sub-frames 210 face each other.

[0285] Similar to the distance adjusting member 391 of the lateral distance adjusting unit 390 , each of the lateral distance adjusting units 611 of the lateral infill adjusting unit 610 may be prepared as a single-piece product to be mounted or disassembled by manual labor.

[0286] That is, the lateral inner filling adjustment unit 610 according to this embodiment allows continuous use of the standard modules 100 and the lateral cantilever modules 200 modularized to certain sizes by adjusting the length of each of the plurality of lateral distance adjustment units 611 even when applied to the cargo hold 10 having different sizes, thereby ensuring application of the scaffold structure to other vessels.

[0287] Each of the lateral distance adjustment units 611 is disposed on a dotted line extending longitudinally from each of the plurality of first support members 230 disposed between the pair of first sub-frames 210.

[0288] In this embodiment, the plurality of lateral distance adjustment units 611 can be designed to have the same or similar strength as the plurality of first support members 230.

[0289] Referring to Figure 12 , each of the lateral distance adjustment units 611 can be provided with a wedge-type fixing pin 611a at opposite ends thereof to allow easy separation of each of the lateral distance adjustment units 611 provided as a single-piece product, and can be latched to a plurality of fixing pin couplers c4 at opposite ends thereof, the plurality of fixing pin couplers c4 being formed on a side surface of the first upper suspension member 211 opposite to a surface of the first upper suspension member 211 on which the support bar coupler c3 is formed.

[0290] Here, the diagonal brace 330 can be coupled to a bracket c5 at opposite ends thereof, respectively, the bracket c5 being formed at a corner where the second horizontal member 113 of the main frame 110 meets the vertical member 111 thereof and on an outer peripheral surface of the socket portion 115.

[0291] In this embodiment, each of the plurality of standard modules 100 and the plurality of cantilever modules 200 can be modularized to a larger size, and can be disassembled using a separate disassembly device, as described above.

[0292] The disassembly device according to this embodiment can be a mobile cart Mc including a main body having a traveling member to move to the inside of the scaffold structure having a plurality of floors, and a hoist disposed on the main body and having a hoisting function, as shown in Figure 15 .

[0293] As an example, the mobile cart Mc moves to a position below the standard module 100 to be separated (see (a) of Figure 15 ), hoists the connection member 150 of the standard module 100 (by a distance of about 200 mm, see (b) of Figure 15 ), to separate the socket portion 115 of the standard module 100 from the column 310 (see (c) of Figure 15(c) ), the standard modules 100 are lowered to the mobile cart Mc drivable (using the lifting stroke of the mobile cart Mc, see Figure 15 (d) ), and moved to the module landing portion 500.

[0294] In this embodiment, the mobile cart Mc can be used to conveniently disassemble each of the plurality of standard modules 100 and the plurality of cantilever modules 200 modularized into a larger size, thereby providing an advantageous effect of preventing a worker's musculoskeletal disease while reducing the risk of various accidents by minimizing manual labor and heavy lifting during the process of installing or disassembling the scaffold structure.

[0295] Next, referring to Figures 2 to 15 , a method of disassembling a scaffold structure for a heat insulation operation in an LNG cargo hold according to an embodiment of the present application will be simply described.

[0296] The method of disassembling the scaffold structure is a method for disassembling the scaffold structure from the inner wall of the cargo hold to construct a heat insulation layer inside the cargo hold, and can include: separating the plurality of standard modules 100 and the plurality of cantilever modules 200 from the inner wall of the cargo hold 10; connecting the standard modules 100 or the cantilever modules 200 to the conveyance structure 400 disposed at the center of the cargo hold 10 to convey the standard modules 100 or the cantilever modules 200 to a lower portion of the cargo hold 10; and conveying the standard modules 100 or the cantilever modules 200 from the lower portion of the cargo hold 10 to the outside of the cargo hold 10 through the side opening 10a disposed at one side of the cargo hold 10.

[0297] In this embodiment, before the step of conveying the standard modules 100 or the cantilever modules 200 to the lower portion of the cargo hold 10, the method can further include installing the module landing portion 500 so as to face the center of the cargo hold 10 from the standard modules 100 disposed at the center of the inner wall of the cargo hold 10 at the starboard side or the port side of the cargo hold 10.

[0298] As described above, the module landing portion 500 can be composed of a plurality of standard modules 100, columns 310 coupled to the standard modules 100 at the upper portion or the lower portion of the scaffold structure, and diagonal braces 330, and obviously, the upper area of the module landing portion 500 can vary depending on the longitudinal width and the lateral width of the conveyance structure 400 (particularly, the monorail platform 411) at the upper center of the cargo hold 10, or the number of aerial monorail cranes 415 coupled to the monorail platform 411.

[0299] For example, in the plan of the cargo hold shown in Figure 16 , for the module landing portion 500 including four aerial monorail cranes 415 (see Figure 5 or Figure 7A plurality of standard modules 100 can be further added to the bow side or the stern side of the module landing portion 500.

[0300] The step of separating each of the plurality of standard modules 100 and the plurality of cantilever modules 200 can include moving the mobile cart Mc to a position under the standard module 100 or the cantilever module 200 to be separated, lifting the standard module 100 or the cantilever module 200 using the mobile cart Mc, and moving the separated standard module 100 or the separated cantilever module 200 to the module landing portion 500 disposed at the opposite side of the center of the cargo hold 10 in the cross section of the cargo hold 10.

[0301] In the step of separating each of the plurality of standard modules 100 and the plurality of cantilever modules 200, in separating one of the plurality of standard modules 100, the method can further include separating the column 310 from the standard module 100.

[0302] The scaffold structure for insulation work in an LNG cargo hold according to the embodiment can further include a ladder structure 630 and a hoist 650 to allow workers to access any deck from the lowermost deck to the uppermost deck of the standard modules 100 constituting the plurality of decks.

[0303] In this embodiment, referring to Figure 16 The ladder structure 630 can be disposed between the standard modules 100 among the plurality of standard modules 100 disposed on the inner wall of the cargo hold 10 at the opposite sides of the center of the cargo hold 10 in the cross section of the cargo hold 10 (at the starboard side and the port side) adjacent to the module landing portion 500, and can be provided singularly or in plurality at each of the starboard side and the port side inside the cargo hold 10.

[0304] Referring to Figure 16 The hoist 650 can be disposed in the bow direction of some of the plurality of cantilever modules 700 disposed at the stern side of the cargo hold 10 in the plane of the cargo hold 10.

[0305] Here, the hoist 650 can be suspended from the upper deck Td of the cargo hold 10 to be connected to the longitudinal cantilever module 700 described below, and some of the plurality of standard modules 100 disposed at the stern side of the cargo hold 10 can be disposed to surround the other side of the hoist 650 without surrounding the side of the hoist 650 connected to the longitudinal cantilever module 700.

[0306] The scaffold structure for insulation work in an LNG cargo hold according to the embodiment can allow workers to access any deck from the lowermost deck to the uppermost deck of the standard modules 100 constituting the plurality of decks, while allowing the transportation of single-piece components through the hoist 650 in the operation for disassembling the scaffold structure.

[0307] Next, a method of installing a scaffold structure according to an embodiment will be further described with reference to Figure 16

[0308] As described above, the method of installing a scaffold structure for a thermal insulation operation in an LNG cargo hold according to an embodiment can include installing a plurality of standard modules 100 at positions spaced apart from inner walls of the cargo hold 10; coupling a plurality of cantilever modules 200, 700 to the plurality of standard modules 100 to be adjacent to the inner walls of the cargo hold 10; and installing a plurality of infill adjustment units 610, 810 between one of the plurality of cantilever modules 200, 700 and another cantilever module adjacent thereto.

[0309] The method of installing a scaffold structure according to an embodiment can further include installing a module landing portion 500 so as to face a center of the cargo hold 10 from the standard modules 100 disposed at the center of the inner walls of the cargo hold 10 at the starboard side or the port side of the cargo hold 10; installing a staircase structure 630 between the standard modules 100 on the inner walls of the cargo hold 10 at opposite sides of the center of the cargo hold 10 in a cross section of the cargo hold 10 to be adjacent to the module landing portion 500; and installing an elevator 650 in a bow direction of some of the plurality of cantilever modules 700 disposed in a plane of the cargo hold 10 at a stern side of the cargo hold 10 so as to allow workers to access any floor surface from a lowermost floor surface to an uppermost floor surface of the standard modules 100 constituting a plurality of floor surfaces.

[0310] In the step of installing the elevator 650, some of the plurality of cantilever modules 700 disposed at the stern side of the cargo hold 10 can be disposed to enclose the other side of the elevator 650, without enclosing the side of the elevator 650 connected to the cantilever modules 700.

[0311] Figure 17 A perspective view of a scaffold structure of Figure 16 installed at a corner of an inner space of a cargo hold, Figure 18 a bottom perspective view of the scaffold structure shown in Figure 17 , and Figure 19 an enlarged view of a region D of Figure 18 .

[0312] In the scaffold structure for a thermal insulation operation in an LNG cargo hold according to an embodiment, the transverse cantilever modules 200 and the longitudinal cantilever modules 700 can be collectively disposed at one side and the other side of each of the standard modules 100 disposed at a corner of an inner space of the cargo hold 10 and spaced apart from each other in a plane of the cargo hold 10 shown in Figure 16 .

[0313] ​That is, the scaffold structure for insulation operation in an LNG cargo hold according to the embodiment can include: standard modules 100 disposed at corners of an inner space of the cargo hold 10 to be spaced apart from each other and coupled to each of a plurality of columns 310 at an upper portion or a lower portion of the scaffold structure to form a plurality of floor surfaces; lateral cantilever modules 200 coupled to one side of the standard modules 100 to be adjacent to an inner wall of the cargo hold 10 from a corner of the cargo hold 10 at a starboard side or a port side thereof; and longitudinal cantilever modules 700 coupled to the other side of the standard modules 100 to be adjacent to the inner wall of the cargo hold 10 from a corner of the cargo hold 10 at a bow side or a stern side thereof. Figure 16 In a plan view of the cargo hold 10 shown in FIG. 7, the longitudinal cantilever modules 700 are coupled to the other side of the standard modules 100 to be adjacent to the inner wall of the cargo hold 10 from a corner of the cargo hold 10 at a bow side or a stern side thereof.

[0314] Further, the diagonal braces 330 can be further disposed between one of the plurality of standard modules 100 at a corner of the inner space of the cargo hold 10 and another standard module 100 disposed above or below the one standard module 100.

[0315] Here, the standard modules 100 and the lateral cantilever modules 200 are the same as the modules described above and detailed descriptions thereof will be omitted. Herein, only the longitudinal cantilever modules 700 will be simply described.

[0316] Referring to Figure 18 , the longitudinal cantilever modules 700 can include: a pair of second sub-frames 710 having a shorter length than the first sub-frames 210 and spaced apart from each other; a middle abutment 750 disposed in the middle between the pair of second sub-frames 710 and extending in parallel to the pair of second sub-frames 710; and a plurality of second support members 730 disposed between the pair of second sub-frames 710 and the middle abutment 750 to connect the pair of second sub-frames 710 to the middle abutment 750.

[0317] Similar to the lateral cantilever modules 200, in the longitudinal cantilever modules 700 according to this embodiment, scaffold plates can be fastened to upper surfaces of the pair of second sub-frames 710, the middle abutment 750, and the plurality of second support members 730, and the pair of second sub-frames 710 can have a truss structure to achieve weight reduction and improvement of structural stability of the scaffold structure.

[0318] Similar to the first sub-frames 210, the second sub-frames 710 can include second upper suspension members 711, second lower suspension members 713, and a plurality of second diagonal brace members 715. The second upper suspension members 711, the second lower suspension members 713, and the plurality of second diagonal brace members 715 can be integrally connected to each other by bolting or welding.

[0319] The second upper suspension member 711, the middle butt joint 750, and the plurality of second support members 730 can be implemented by rectangular steel pipes having the same cross-sectional area, and the second lower suspension member 713 and the plurality of diagonal brace members 715 can be implemented by rectangular steel pipes having a smaller cross-sectional area than the second upper suspension member 711.

[0320] Further, the second lower suspension member 713 can have a shorter length than the second upper suspension member 711, whereby the longitudinal cantilever module 700 can have a downwardly tapered side surface at the distal end thereof.

[0321] Similarly to the first support members 230, the plurality of second support members 730 can be coupled to a plurality of support bar couplers c3 formed along the length of the second upper suspension member 711 at a distance from each other in the direction in which the pair of second sub-frames 710 face each other by bolt fastening.

[0322] Further, one end of each of the second upper suspension member 711 and the second lower suspension member 713 can have a flange shape corresponding to the distal end of the upper protrusion 117a or the lower protrusion 117b of the longitudinal flange portion formed on the main frame 110.

[0323] That is, according to this embodiment, similarly to the transverse cantilever module 200, the longitudinal cantilever module 700 can be coupled to the second sub-frames 710 by coupling one end of each of the second upper suspension member 711 and the second lower suspension member 713 to the upper protrusion 117a or the lower protrusion 117b of the longitudinal flange portion (not shown in the drawings) with a flange interposed therebetween by bolt fastening, whereby the weight of the longitudinal cantilever module 700 and the load applied to the longitudinal cantilever module 700 can be delivered to the standard module 100 while minimizing sagging at the distal end of the longitudinal cantilever module 700.

[0324] In Figure 16 a plane of the cargo hold 10 shown in FIG. 11, the scaffold structure for insulation operation in the LNG cargo hold according to this embodiment can further include a plurality of longitudinal infill adjustment units 810 each connecting one of the plurality of longitudinal cantilever modules 700 to another longitudinal cantilever module 700 adjacent thereto.

[0325] Similarly to the transverse infill adjustment unit 610, each of the longitudinal infill adjustment units 810 can include a plurality of transverse distance adjustment members (not shown in the drawings) having a bar shape and coupled to the pair of second sub-frames 710, respectively, in a direction opposite to the direction in which the pair of second sub-frames 710 face each other.

[0326] The longitudinal infill adjustment unit 810 has the same structure and function as the lateral infill adjustment unit 610 except for the installation position, and thus a detailed description thereof will be omitted.

[0327] refer to Figure 18 and Figure 19 The scaffold structure for thermal insulation operation in the LNG cargo tank according to this embodiment may further include a corner connection portion 830 connecting the transverse cantilever module 200 to the longitudinal cantilever module 700 and positioned close to a corner of the cargo tank 10 .

[0328] The corner connection portion 830 may include a plurality of segment parts 831, 832, 833, 834, 835 (see FIG. 1 ), each provided as a single-piece product. Figure 19 ).

[0329] In this embodiment, since it is difficult to access the area where the corner connecting portion 830 is located and it is difficult to modularize this area due to its spatial characteristics, each of the multiple section parts 831, section parts 832, section parts 833, section parts 834, and section parts 835 provided as a single-piece product is manually installed or disassembled.

[0330] like Figure 18 and Figure 19 As shown in FIG, the corner connection portion 830 may be composed of a plurality of segment parts 831, 832, 833, 834, and 835 having various shapes and each having a flange-shaped end (see FIG. Figure 19 ).

[0331] Preferably, each of the plurality of segment parts 831 , 832 , 833 , 834 , 835 is coupled to a separate plate (not shown) at a distal end thereof or at opposite sides thereof by bolting or welding to form a flange.

[0332] In this embodiment, one of the plurality of segment parts 831, 832, 833, 834, and 835 can be fastened by bolts to another segment part 831, 832, 833, 834, or 835 adjacent thereto, or to the transverse cantilever module 200 or the longitudinal cantilever module 700, with the flange interposed therebetween (see Figure 19 ).

[0333] On the other hand, the scaffold structure disposed in the corner region of the cargo tank 10 can be twisted or bent, and the lateral cantilever module 200, the longitudinal cantilever module 700, and the free end of the plurality of segment members 830 connecting the lateral cantilever module 200 to the longitudinal cantilever module 700 can be extremely vulnerable to sagging.

[0334] To prevent the plurality of segment members 830 from sagging, the scaffold structure for thermal insulation operation in an LNG cargo tank according to this embodiment can further include a sag-preventing column 850 coupled to one side of the plurality of segment members 831, 832, 833, 834, 835, or the lateral cantilever module 200.

[0335] The sag-preventing column 850 can have the same outer diameter and shape as the column body 310, and can include a column coupling portion (not shown in the drawings) at a portion thereof to which it is coupled, such that one end of the sag-preventing column 850 can be inserted therein, similar to the structure of the vertical member 111 and the socket portion 115 of the main frame 110.

[0336] Further, the scaffold structure for thermal insulation operation in an LNG cargo tank according to this embodiment can further include at least one reinforcement truss 870 coupled to the standard module 100 and the lateral cantilever module 200, in order to prevent the scaffold structure from being twisted or bent at the corner of the cargo tank 10.

[0337] Referring to Figure 17 and Figure 18 The reinforcement truss 870 can include a horizontal reinforcement member 871 downwardly spaced apart from the connection frame 130 and the first support member 230 of the standard module 100 and extending in a horizontal direction, and a plurality of diagonal reinforcement members 873 connecting the horizontal reinforcement member 871 to the connection frame 130 or connecting the horizontal reinforcement member 871 to the first support member 230.

[0338] As an example, as shown in Figure 18 in the corner region of the cargo tank 10, the standard module 100 can have two reinforcement trusses 870, and the lateral cantilever module 200 can have one reinforcement truss 870.

[0339] Each of the horizontal reinforcement member 871 and the plurality of diagonal reinforcement members 873 can be implemented by a rectangular steel pipe having the same cross-sectional area as the second horizontal member 113 or the lower suspension member, and the horizontal reinforcement member 871 and the plurality of diagonal reinforcement members 873 can be integrally connected to the connection frame 130 of the standard module 100 or the first support member 230 of the lateral cantilever module 200 by bolt fastening or welding.

[0340] In the corner area of the cargo hold 10 where the scaffold structure can be subjected to twisting or bending, the scaffold structure according to this embodiment can further be provided with sag prevention columns 850 and reinforcement trusses 870, thereby preventing deformation of the scaffold structure or sagging at its distal end.

[0341] Next, a method of installing the scaffold structure in the corner area of the cargo hold 10 will be described. The method can include installing the standard module 100 to be separated from the corner of the interior space of the cargo hold 10, installing the lateral cantilever module 200 at one side of the standard module 100 to be adjacent to the inner wall of the cargo hold 10 at the starboard side or the port side thereof from the corner of the cargo hold 10, and coupling the longitudinal cantilever module 700 to the other side of the standard module 100 to be adjacent to the inner wall of the cargo hold 10 at the bow side or the stern side thereof from the corner of the cargo hold 10.

[0342] The step of installing the standard module 100 can include installing at least one reinforcement truss 870 to prevent the standard module 100 from twisting or bending, and coupling a plurality of columns 310 to the standard module 100 at the upper or lower portion of the scaffold structure.

[0343] The method of installing the scaffold structure according to the embodiment can further include installing the corner connection portion 830 to be adjacent to the corner of the cargo hold 10 by connecting the lateral cantilever module 200 to the longitudinal cantilever module 700 in the corner area of the cargo hold 10.

[0344] The step of installing the corner connection portion 830 can include connecting one of the plurality of segment members 831, 832, 833, 834, 835 to another segment member 831, 832, 833, 834, or 835, the lateral cantilever module 200, or the longitudinal cantilever module 700 adjacent thereto, and coupling the sag prevention column 850 to one of the plurality of segment members 831, 832, 833, 834, 835 or to one side of the lateral cantilever module 200 so as to prevent the corner connection portion 830 from sagging.

[0345] In the scaffold structure for insulation operation in an LNG cargo hold according to this embodiment, some of the modules of the scaffold structure are modularized to a larger size to allow the scaffold structure to be installed or disassembled inside the LNG cargo hold to reduce manual labor and working hours when constructing an insulation layer in the LNG cargo hold.

[0346] Furthermore, each of the modularized standard modules 100 and cantilever modules into larger sizes can be conveniently disassembled by workers using separate disassembling devices, thereby providing advantageous effects of preventing musculoskeletal diseases of workers while reducing the risk of various accidents by minimizing manual labor and heavy lifting in the process of installing or disassembling the scaffold structure.

[0347] Furthermore, each of the standard modules 100 and cantilever modules has a truss structure, thereby ensuring convenient assembly and installation by reducing the weight of the scaffold structure while improving the structural stability of the scaffold structure against vertical bending or torsional deformation.

[0348] Furthermore, the lateral distance adjustment units are disposed between the main structure and the platform structure to allow continuous use of the modularized standard modules 100 and cantilever modules into certain sizes by adjusting the length of each of the plurality of distance adjustment members even when applied to cargo holds having different sizes, thereby ensuring application of the scaffold structure to other ships.

[0349] Furthermore, the scaffold structure can allow the length of the plurality of distance adjustment members to be changed when applied to cargo holds having different sizes, so as to ensure continuous use of the modularized standard modules 100 and cantilever modules into certain sizes by the infill adjustment units each connecting one of the plurality of cantilever modules to another cantilever module adjacent thereto, thereby ensuring application of the scaffold structure to other ships.

[0350] Furthermore, the scaffold structure can further include a sag prevention column or a reinforcing truss in a corner region of the cargo hold in which the scaffold structure can be subjected to torsion or bending, thereby preventing sagging of deformation of the scaffold structure at a distal end thereof.

[0351] While some embodiments have been described herein, it should be understood by those skilled in the art that various modifications, changes, and alterations can be made by those skilled in the art without departing from the spirit and scope of the present application. It is therefore intended that the appended embodiments and drawings be interpreted as illustrative only and not in a limiting sense in all respects. The scope of the present application should be defined by the appended claims and their equivalents.

Claims

1. A scaffolding structure installed in the interior space of a cargo hold for constructing a thermal insulation layer in the cargo hold, the scaffolding structure comprising: a plurality of standard modules modularized to a larger size in the interior space of the cargo hold and coupled to a plurality of pillars at an upper portion or a lower portion of the scaffolding structure to form a plurality of bottom surfaces; as well as a plurality of cantilever modules modularized to a larger size and coupled to one side of each of the plurality of standard modules to be adjacent to the inner wall of the cargo hold, Each of the standard modules includes: a pair of main frames, spaced apart from each other in one direction; a pair of connecting frames coupled to opposite ends of the main frames to integrally connect the pair of main frames; and a plurality of connecting members disposed between the pair of main frames so as to be spaced apart from each other in the longitudinal direction of the main frames and parallel to the connecting frames, and Each of the cantilever modules comprises: a pair of sub-frames spaced apart from each other in one direction; and A plurality of support members are disposed between the pair of sub-frames to integrally connect the pair of sub-frames to each other and are coupled to each other in a longitudinal direction of the sub-frames.

2. The scaffolding structure according to claim 1, wherein each of the main frames comprises: a pair of vertical members having the same outer diameter as the struts; a first horizontal member extending horizontally in a direction in which the pair of vertical members face each other; a second horizontal member having the same length as the first horizontal member and spaced downwardly from the first horizontal member, the second horizontal member being connected at opposite ends thereof to outer peripheral surfaces of the pair of vertical members; as well as A plurality of inclined components are disposed between the first horizontal component and the second horizontal component.

3. The scaffolding structure according to claim 2, wherein each of the main frames comprises: a pair of flange portions projecting from an outer peripheral surface of one of the pair of vertical members opposite to the direction in which the pair of vertical members face each other, each of the flange portions having a flange-shaped distal end; and A socket portion is formed by enlarging the diameter of a distal end of each of the vertical members and has an inner diameter corresponding to the outer diameter of the pillar to accommodate the pillar inserted therein.

4. The scaffolding structure according to claim 3, further comprising: a diagonal brace for diagonally connecting one of the plurality of standard modules constituting the plurality of bottom surfaces to another standard module disposed above or below the one standard module, The diagonal braces are coupled at opposite ends thereof to corners of the scaffold structure where the second horizontal members respectively meet the vertical members and brackets formed on the outer peripheral surface of the socket portion.

5. The scaffolding structure of claim 3, wherein each of the sub-frames comprises: an upper suspension member extending in a horizontal direction; a lower suspension component, spaced downwardly from the upper suspension component; as well as A plurality of diagonal bracing members are disposed between the upper suspension member and the lower suspension member to connect the upper suspension member to the lower suspension member.

6. The scaffolding structure of claim 5, wherein each of the flange portions comprises: an upper protrusion protruding from an upper outer peripheral surface of the vertical member and coupled to one end of the upper suspension member; as well as a lower protrusion protruding from a lower outer peripheral surface of the vertical member to be spaced downward from the upper protrusion and coupled to one end of the lower suspension member, wherein the one end of each of the upper suspension member and the lower suspension member has a flange shape corresponding to a distal end of the upper protrusion or the lower protrusion.

7. The scaffolding structure according to claim 1, further comprising: a conveying structure provided to the upper center of the cargo hold and conveying the plurality of standard modules and the plurality of cantilever modules to the lower portion of the cargo hold when the scaffolding structure is disassembled; as well as A module landing portion is arranged so that the standard modules on the opposite side walls of the center of the cargo hold face the center of the cargo hold in the cross section of the cargo hold, and is provided to the landing area of ​​the multiple standard modules and the multiple cantilever modules when the scaffolding structure is dismantled using the conveying structure.

8. The scaffolding structure according to claim 1, further comprising: a plurality of longitudinal cantilever modules modularized to a larger size and coupled to the other side of the standard module to be adjacent to the inner wall of the cargo hold from a corner of the cargo hold; as well as A plurality of segment members are each disposed between the boom module and the longitudinal boom module to connect the boom module to the longitudinal boom module and are positioned adjacent to the corner of the cargo hold.

9. The scaffolding structure of claim 8, wherein each of the longitudinal cantilever modules comprises: a pair of second sub-frames having a shorter length than the first sub-frames and spaced apart from each other; an intermediate docking member, disposed in the middle between the pair of second sub-frames and extending parallel to the pair of second sub-frames; as well as A plurality of second supporting members are disposed between the pair of second sub-frames and the intermediate docking member to connect the pair of second sub-frames to the intermediate docking member so as to support the scaffolding panels.

10. The scaffolding structure according to claim 8, further comprising: at least one reinforcing truss positioned at the corner of the cargo hold and coupled to the standard module and the cantilever module to prevent bending and twisting of the main frame; as well as A sagging prevention column is coupled to one side of the plurality of section members or the cantilever module to prevent the plurality of section members from sagging.

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