KR20220135753A - Scaffold structure for heat insulation process of lng cargo and operating method thereof - Google Patents

Abstract

The present invention relates to a scaffolding structure for constructing an insulation layer inside a cargo hold. According to the present invention, the scaffolding structure comprises: a main structure disposed adjacent to an inner wall of the cargo hold to form a plurality of layers; and a supporting structure for supporting the main structure at the bottom of the main structure. The supporting structure comprises a plurality of support units in surface contact with an inner bottom surface of the cargo hold or the insulation layer installed on the inner bottom surface of the cargo hold, and further comprises a corner load distribution part for distributing the load concentrated on the support unit located relatively close to the inner edge of the cargo hold among the plurality of support units.

Description

SCAFFOLD STRUCTURE FOR HEAT INSULATION PROCESS OF LNG CARGO AND OPERATING METHOD THEREOF

The present invention relates to a scaffold structure, and more particularly, to reduce the number of hours of work for workers when installing or dismantling a scaffold structure installed inside the cargo hold for the construction work of the insulation layer of the LNG cargo hold and shorten the schedule for the installation of the insulation layer It relates to a scaffold structure for an LNG cargo hold insulation work and a method for operating the scaffold structure, which can not only be used, but also can properly operate the scaffold structure in the process of installing the insulation layer inside the cargo hold.

Recently, as environmental pollution regulatory standards for ships have been strengthened, interest in eco-friendly, high-efficiency fuels such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG) is increasing.

Liquefied natural gas is liquefied by cooling methane obtained by refining natural gas collected from a gas field. .

In particular, liquefied natural gas (hereinafter referred to as 'LNG') is obtained by cooling natural gas to a cryogenic temperature (about -163 ℃). It is very suitable for long-distance transport.

Liquefied gas carrier (LNG carrier) for loading and unloading liquefied gas to onshore demand by navigating the sea with LNG, or LNG carrying LNG and navigating the sea to arrive at onshore demand, regasification of stored LNG and unloading in natural gas state An LNG cargo hold that can withstand the cryogenic temperature of LNG is provided in the RV (LNG Regasification Vessel).

In addition, the produced natural gas is directly liquefied in the sea and stored, and when necessary, the LNG FPSO (Floating Production Storage and Offloading) used to transfer the stored LNG to an LNG carrier or LNG unloaded from the sea to an LNG carrier is stored. Floating offshore structures such as LNG FSRUs (Floating Storage and Regasification Units) that vaporize LNG as needed and supply it to onshore consumers are also equipped with LNG cargo holds installed in LNG carriers and LNG RVs.

Such an LNG cargo hold can be classified into a membrane type and an independent type depending on whether the insulating material for storing LNG in a cryogenic state directly acts on the load of the cargo.

Membrane-type cargo holds are divided into No 96 type and Mark Ⅲ type, and independent cargo holds have a spherical type MOSS tank and a prismatic type SPB tank.

1 is a view schematically showing the structure of a general cargo hold.

The cargo hold 10 is, as shown in FIG. 1, the bottom block 11 forming the bottom of the hull is formed to form the bottom of the cargo hold 10, and the left and right transverse direction of the floor block 11 to form the side wall of the hull Side shell blocks 12 coupled to both ends may be formed to form a sidewall of the cargo hold 10 .

The trunk deck block 13 is coupled to the upper end of the side shell block 12 to seal and block the internal space of the cargo hold 10 to form the ceiling wall of the cargo hold 10 .

Although not shown in the drawings, a separate bulkhead block (not shown) may be coupled to both front and rear longitudinal ends of the bottom block 11, and due to the structure as described above, the cargo hold 10 is a single sealed interior can have space.

On the other hand, a separate heat insulating layer 20 is provided on the inner wall surface of the cargo hold 10 for external insulation, which may have a form in which a heat insulating box made of a heat insulating material and Inbar steel are sequentially stacked, and the cargo hold ( In the inner space of 10), a separate scaffolding structure (scaffold) 30 for the construction work of the heat insulating layer 20 may be installed.

The above-described technical configuration is a background for helping understanding of the present invention, and does not mean a conventional technique widely known in the art to which the present invention pertains.

Republic of Korea Patent Publication No. 10-1083440 "Scaffolding device" Republic of Korea Patent Publication No. 10-1526369 “System scaffold assembly for LNG cargo hold insulation work” Republic of Korea Patent Publication No. 10-1526370 “System scaffold assembly for LNG cargo hold insulation work and cargo hold module using the same”

The scaffold structure according to the prior art is installed by connecting each of the steel pipe members in the form of a square or round pipe with bolts or pins to each other within a range where an operator can perform manual handling.

In order to dismantle the scaffolding structure, each member constituting the scaffolding is dismantled and the scaffolding is dismantled layer by layer from the top floor using a work elevator (cage size 3x1m) installed inside the cargo hold. And dismantling increases the number and schedule of work, which is not only inefficient, but also increases the incidence of musculoskeletal disorders and various safety accidents of the operator due to the scaffold member having an upper limit.

In addition, there are many restrictions in determining the member size of the scaffold due to restrictions on the cage size and allowable weight of the elevator installed inside the cargo hold. Changes in the location and arrangement of members are inevitably required, and compatibility may be difficult with only the existing scaffolding members.

In addition, the scaffold structure in the prior art is a structure that is prone to torsion or bending, and there are many restrictions on the installation and operation of machine automation equipment. There is a high risk of accidents due to falls.

The present invention modularizes a part of the scaffold structure installed in the interior space of the cargo hold for the construction work of the insulation layer of the LNG cargo hold, thereby reducing the number of hours of work of the operator during the installation or dismantling of the scaffold structure and shortening the schedule for the installation of the insulation layer. In addition, an object of the present invention is to provide a scaffold structure for an LNG cargo hold insulation work that can properly operate the scaffold structure in the process of installing the insulation layer inside the cargo hold, and an operating method of the scaffold structure.

According to an aspect of the present invention, there is provided a scaffold structure for construction of a heat insulation layer inside a cargo hold, comprising: a main structure disposed adjacent to an inner wall of the cargo hold to form a plurality of layers; and a supporting structure for supporting the main structure under the main structure, wherein the supporting structure includes a plurality of support units that are in surface contact with the insulation layer installed on the inner floor surface of the cargo hold or the inner floor surface of the cargo hold, A scaffold structure further comprising a corner load distributing unit for distributing a load concentrated on a support unit positioned relatively close to the inner edge of the cargo hold among the plurality of support units may be provided.

The corner load distributing unit may include: a corner brace connecting the upper and lower portions of each floor by being inclined downward from some edges of the main structure adjacent to the corners of the inner space of the cargo hold to the center of the cargo hold; and an oblique truss part diagonally installed on a bottom surface of the main structure disposed in an area to which the lower chamfer structure of the cargo hold is applied.

In addition, the main structure, a plurality of standard modules installed at a distance from the inner wall of the cargo hold and to which a plurality of posts are coupled to the upper or lower portions; a plurality of transverse cantilever modules installed to face an inner wall of the cargo hold from a standard module disposed adjacent to a port or starboard wall inside the cargo hold among the plurality of standard modules; and a plurality of longitudinal cantilever modules installed to face the bow or stern side wall inside the cargo hold from a standard module disposed adjacent to the bow or stern side wall inside the cargo hold among the plurality of standard modules.

In addition, a corner connecting portion for connecting between the transverse cantilever module and the longitudinal cantilever module in the inner corner region of the cargo hold; an anti-sag post coupled to one side of the corner connection part or the transverse cantilever module; and one or more reinforcing trusses coupled to the standard module and the transverse cantilever module.

In addition, the corner brace portion, a first brace member connecting the bottom edge of the main structure and the lower end of the anti-sag post; and a second brace member connecting one side of the standard module positioned below the upper end of the anti-sag post.

In addition, the second brace member has one end coupled to the upper end of the anti-sag post and the other end is coupled to a vertical member positioned relatively close to the inner center of the cargo hold among a plurality of vertical members on which the transverse cantilever module is installed. can

In addition, the oblique truss portion, a diagonal member spaced apart from the bottom surface of the main structure to extend long toward the inner edge of the cargo hold; and a plurality of diagonal connecting members connecting the diagonal member and a bottom surface of the main structure.

In addition, the diagonal member may connect the vertical member positioned relatively close to the center of the cargo hold among the plurality of vertical members on which the transverse cantilever module is installed and the anti-sagging post positioned in the diagonal direction.

In addition, the diagonal member may be installed extending from the anti-sag post toward the inner edge of the cargo hold, and may be connected to the corner connecting portion through the diagonal connecting member.

In addition, the reinforcing truss part may include a horizontal reinforcing member extending horizontally in a longitudinal direction from a lower portion of the standard module or the transverse cantilever module, and the diagonal member may be installed at a lower position than the horizontal reinforcing member.

In addition, it may further include a diagonal brace connecting any one of the plurality of standard modules and the other standard module connected to the upper or lower part in an oblique direction.

In addition, the main structure forms nine layers in the vertical direction inside the cargo hold, and the corner load distribution unit has a truss structure and is located on the bottom surface of each of the first and second floors of the main structure to face the center inside the cargo hold. Oblique truss units installed diagonally; and a corner brace that is installed to be inclined downwardly in a diagonal direction toward the center of the cargo hold between the second and sixth floors of the main structure to connect the upper part and the lower part of each floor.

According to another aspect of the present invention, there is provided a method of operating a scaffold structure for construction work of a heat insulation layer inside a cargo hold, the method comprising: installing a main structure forming a plurality of layers at a position adjacent to an inner wall of the cargo hold; and installing a supporting structure for supporting the main structure before the step of installing the main structure, wherein the supporting structure is in surface contact with the insulation layer installed on the inner floor surface of the cargo hold or the inner floor of the cargo hold. Of the plurality of support units, the method of operating a scaffold structure further comprising the step of installing a corner load distribution unit for distributing a load concentrated on a support unit located relatively close to the inner edge of the cargo hold among the plurality of support units. can be

In the step of installing the main structure, the step of installing a plurality of standard modules at a distance from the inner wall of the cargo hold; installing a plurality of transverse cantilever modules from a standard module disposed adjacent to a port or starboard side wall inside the cargo hold toward an inner wall of the cargo hold among the plurality of standard modules; and installing a plurality of longitudinal cantilever modules from a standard module disposed adjacent to the bow or stern side wall inside the cargo hold to the bow or stern side wall inside the cargo hold among the plurality of standard modules. have.

The present invention enlarges a part of the scaffold structure installed inside the cargo hold in the form of a module for the construction work of the insulation layer of the LNG cargo hold, thereby reducing the number of hours of work for workers during the installation or dismantling of the scaffold structure and the schedule of the installation of the insulation layer inside the cargo hold It may have a shortening effect.

In addition, each of the plurality of standard modules and the plurality of cantilever modules is provided to have a truss structure, which not only makes assembly and installation easier through weight reduction, but also improves the structural stability of the scaffold structure against vertical bending or torsional deformation. can

In addition, by additionally installing the anti-sag post and the reinforcing truss in the corner region of the cargo hold, which is structurally prone to torsion or bending, it can have the effect of preventing deformation of the scaffold structure or sagging of the free end.

Furthermore, through the corner load distributing part, it is possible not only to alleviate the phenomenon of load concentration on the support unit located relatively close to the inside edge of the cargo hold, but also to reduce the amount of deflection of the corner of the scaffold structure disposed adjacent to the edge of the cargo hold interior space. It may have the effect of significantly reducing it.

1 is a view schematically showing the structure of a general cargo hold.
2 is a view schematically illustrating a scaffold structure for an LNG cargo hold insulation operation according to an embodiment of the present invention.
3 is a view schematically showing a cross-section of a central part of a cargo hold in which a transport means for dismantling a scaffold structure for an LNG cargo hold insulation work is installed according to an embodiment of the present invention.
FIG. 4 is an enlarged view of the conveying means shown in FIG. 3 .
5 is a perspective view of the transfer means shown in FIG. 4 except for the mast part and the connecting brace part.
FIG. 6 is an enlarged view of the mast of FIG. 4 separated.
FIG. 7 is an enlarged view showing the connection brace shown in FIG. 4 separated.
8 is a view for explaining a method of dismantling the scaffold structure using the transfer means shown in FIG.
9 is a perspective view showing the main configuration of a scaffold structure for insulation work of an LNG cargo hold according to an embodiment of the present invention.
FIG. 10 is a diagram illustrating a schematic side view of FIG. 9 .
FIG. 11 is an enlarged view of area 'A' of FIG. 9 .
FIG. 12 is an enlarged view of area 'B' of FIG. 9 .
FIG. 13 is an enlarged view of area 'C' of FIG. 9 .
14 is a view schematically illustrating a plan view of a scaffold structure based on the line X-X' of FIG. 3 .
15 is a perspective view showing the scaffold structure installed on the port side wall inside the cargo hold with the plane of the scaffold structure shown in FIG. 14 separated.
FIG. 16 is an enlarged view of area 'D' of FIG. 15 .
FIG. 17 is a perspective view showing the scaffold structure installed in the corner of the cargo hold internal space based on the plane of the scaffold structure shown in FIG. 14 .
18 is a perspective view illustrating the rear surface of the scaffold structure shown in FIG. 17 .
19 is an enlarged view of area 'E' shown in FIG. 18 .
20 is a perspective view illustrating that the corner portion of the scaffold structure installed in the corner region of the cargo hold inner space forms a plurality of layers based on the plane shown in FIG. 16 .
FIG. 21 is a view showing that a corner load distribution unit is additionally installed in the scaffold structure shown in FIG. 20 .
22 is a plan view for explaining the installation structure of the corner brace shown in FIG. 21 .
23 is a rear perspective view for explaining the installation structure of the diagonal truss unit shown in FIG. 21 .
24 is a view showing a comparison of the distribution of the reaction force of the support unit due to the corner load distribution in the scaffold structure according to an embodiment of the present invention.
25 is a view showing a comparison of the amount of corner deflection according to the presence or absence of a corner brace in the scaffold structure according to an embodiment of the present invention.

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

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in adding reference numerals to the components of each drawing, the same components are given the same reference numerals as much as possible even though they are indicated on different drawings.

In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described, but the technical spirit of the present invention is not limited thereto and may be variously implemented by those skilled in the art without being limited thereto.

First, with reference to FIGS. 2 to 3 , a scaffold structure for insulating an LNG cargo hold according to an embodiment of the present invention will be described.

2 is a view schematically showing a scaffold structure for an LNG cargo hold insulation operation according to an embodiment of the present invention, and FIG. 3 is a transport means for dismantling a scaffold structure for an LNG cargo hold insulation operation according to an embodiment of the present invention. It is a view schematically showing a cross section of the central part of the cargo hold to be installed.

The scaffold structure for the LNG cargo hold insulation work according to an embodiment of the present invention is a scaffold structure for the construction work of the heat insulation layer 20 inside the cargo hold 10, and as shown in FIGS. 2 to 3, the inside of the cargo hold 10 A main structure (MS) disposed adjacent to each of the two side walls (left and right side of the hull) to form a plurality of layers, a platform structure (350) extending long in the transverse direction between the main structure (MS), and a cargo hold (10) It is installed on the inner bottom surface may include a supporting structure 370 for supporting the main structure (MS).

The main structure (MS) of this embodiment, as shown in FIGS. 2 to 3, a plurality of standard modules (Standard module) 100 and a plurality of standard modules 100 on the basis of the cross section of the cargo hold, one side of each Alternatively, it may include a plurality of cantilever modules 200 coupled to the other side.

In the present embodiment, each of the plurality of standard modules 100 and the plurality of cantilever modules 200 is provided by being enlarged in a module type, and disassembly can be performed using a separate dismantling means.

In the standard module 100, a plurality of posts 310 are coupled to the upper or lower portions at positions spaced apart from both side walls inside the cargo hold 10 to form a plurality of layers, and a cantilever module to be described later ( 200) can serve as structural support.

In the present embodiment, at least some of the plurality of standard modules 100 may have a truss structure so as to be able to achieve weight reduction and to sufficiently withstand vertical bending deformation by securing structural stability.

The post 310 may be coupled to both ends of the standard module 100 and extend to the upper or lower portion of the standard module 100, and the plurality of standard modules 100 and the plurality of cantilever modules 200 may be connected to the posts 310. Accordingly, a plurality of layers may be formed at regular intervals in the vertical direction in the interior of the cargo hold 10 .

In the scaffold structure for LNG cargo hold insulation work according to an embodiment of the present invention, the number of floors (for example, change from the 9th to the 10th floor) or the posts 310 according to the height of the cargo hold 10 where the scaffolding structure is installed By increasing or decreasing only the length of , it can have an effect that can be easily applied to other ships.

On the other hand, the main structure (MS) of this embodiment, as shown in FIGS. 2 to 3, another standard module connected to any one of the plurality of standard modules 100 forming a plurality of layers and upper or lower It may further include a diagonal brace (330) for connecting (100) in an oblique direction.

The diagonal brace 330 may serve to minimize distortion and deformation in the entire main structure MS including the plurality of standard modules 100 and the plurality of cantilever modules 200 , and the main structure together with the posts 310 . (MS) can increase structural rigidity and strength.

The cantilever module 200 is coupled to one side or the other side of the standard module 100 so as to be adjacent to both side walls of the cargo hold 10 and has a cantilever shape without coupling of the post 310, and the inner wall of the cargo hold 10 of the heat insulation layer 20 may be provided as a main place where construction work is performed.

In addition, at least some of the plurality of cantilever modules 200 may have a truss structure shape to reduce weight and improve structural stability, similar to the standard module 100 .

The scaffold structure for LNG cargo hold insulation work according to an embodiment of the present invention increases the size of a part of the scaffold structure in the form of a module, thereby reducing the number of working hours of the operator during installation or dismantling of the scaffold structure and the cargo hold 10, the internal insulation layer 20 It may have the effect of shortening the installation work schedule.

In addition, each of the plurality of standard modules 100 and the plurality of cantilever modules 200 is provided to have a truss structure, so that assembly and installation are simplified through weight reduction, and structural stability of the scaffold structure against vertical bending or torsional deformation This may have an improved effect.

Hereinafter, detailed configurations of the standard module 100 and the cantilever module 200 of the present embodiment will be described later.

The platform structure 350 is formed to extend long in the transverse direction between the main structures MS and is provided in the form of a bridge having a long span without a separate lower support structure, and the cargo hold 10 inside It may be provided as a place to store and load the insulation box for the insulation layer 20 construction, or to perform a pre-processing operation.

The platform structure 350 is, as shown in FIGS. 2 to 3, an upper bridge deck 351 disposed between the uppermost layers of the main structure MS forming a plurality of layers, and an upper bridge It may include a lower bridge deck (Lower bridge deck) 353 disposed under the deck (351).

2 to 3, the main structure (MS) of this embodiment can form a plurality of layers in the vertical direction inside the cargo hold 10 by combining the plurality of standard modules 100 and the posts 310. have.

Specifically, the main structure MS of this embodiment may form nine layers except for the bottom surface of the cargo hold 10 , and the upper bridge deck 351 and the lower bridge deck 353 are the main structures MS, respectively. It can be arranged side by side in the transverse direction in the uppermost and third floors of

Here, the lower bridge deck 353 is arranged in parallel with the third floor of the main structure MS, and it is possible to access the side opening (not shown) 10a (see FIG. 8 ) provided on one side wall of the cargo hold 10 . Accordingly, it can serve as a logistics transfer platform capable of transporting the plurality of standard modules 100 and the plurality of cantilever modules to the outside of the cargo hold 10 during installation or dismantling of the scaffold structure.

The supporting structure 370 is installed on the inner floor surface of the cargo hold 10 to support the main structure MS, and may include a plurality of support units 371 supported on the inner floor surface of the cargo hold 10 . .

Each of the plurality of support units 371 is in surface contact with the bottom surface of the cargo hold 10 through a plate-shaped leg base (not shown) provided at the lower end, or the insulation layer 20 installed on the floor surface, and the insulation layer ( 20) During the construction process, the height can be adjusted so that the entire load of the scaffold structure including the main structure MS can be equally transmitted to the bottom surface of the cargo hold 10 , or the heat insulation layer 20 .

Specifically, the support unit 371 of this embodiment may be provided to support the main structure MS by being primarily installed on the bottom surface of the cargo hold 10 (see FIG. 2 ), and the bottom inside the cargo hold 10 . After the process of constructing the heat insulating layer 20 on the surface or after the construction of the heat insulating layer 20 is completed, the height of each of the plurality of support units 371 is adjusted to the heat insulating layer 20 formed on the inner bottom surface of the cargo hold 10. It may be provided to be installed secondary (refer to FIG. 3).

In this embodiment, a plurality of support units 371 are coupled to the lower portion of the main structure MS to form one layer (first floor), the corresponding layer being chamfers on both sides of the internal cross-section of the cargo hold 10 . Due to the structure, the members are assembled and configured, and may have a truss structure to reduce weight and improve structural stability.

Here, the installation position of each of the plurality of support units 371 may be flexibly applied according to the size of the cargo hold 10 or the design change of the insulation system installed in the cargo hold 10 .

On the other hand, the scaffold structure for the LNG cargo hold insulation work according to an embodiment of the present invention connects the main structure MS and the platform structure 350 at both ends of the platform structure 350 in the transverse direction, but the main structure MS and the platform A lateral distance adjusting unit 390 for adjusting the distance between the structures 350 may be further included.

The lateral distance adjusting unit 390 includes a plurality of distance adjusting members 391 connecting the main structure MS and the platform structure 350 in a horizontal or diagonal direction, as shown in FIGS. 2 to 3 . may be included, and the lateral distance between the main structure MS and the platform structure 350 may be adjusted by changing the length of each of the plurality of distance adjusting members 391 .

In this embodiment, it may be difficult to modularize between the main structure MS and the platform structure 350 due to structural characteristics, and accordingly, each of the plurality of distance adjusting members 391 is provided as a single piece and installed through the manual operation of the operator. or it can be dismantled.

In the scaffold structure for the LNG cargo hold insulation work according to an embodiment of the present invention, the lateral distance adjusting unit 390 is provided between the main structure MS and the platform structure 350 so that the size of the cargo hold 10 is applied differently. By changing the length of each of the plurality of distance adjusting members 391, it is possible to continuously use the standard module 100 and the cantilever module 200 that are modularized to a predetermined size, and can be easily interchanged with other ships.

As shown in FIG. 3, the scaffold structure for the LNG cargo hold insulation work according to an embodiment of the present invention includes a transport means 400 installed in the upper center of the cargo hold 10 for dismantling the scaffold structure, and a transport means ( When dismantling the scaffold structure using the 400 , the module may further include a landing unit 530 provided as a landing zone of the plurality of standard modules 100 and the plurality of cantilever modules 200 .

In this embodiment, the module landing unit 530 is a standard module disposed on both side walls of the main structure MS, that is, the cargo hold 10, based on the central cross section of the cargo hold 10 shown in FIG. 3 . It is installed to face the center of the cargo hold 10 from 100 may form a plurality of layers.

Here, the module landing unit 530, similar to the main structure (MS), a plurality of standard modules 100 and the posts 310 and diagonal braces 330 coupled to the upper or lower portions of the standard module 100 . can be composed of

Hereinafter, with reference to FIGS. 4 to 8, the conveying means 400 of this embodiment will be described in detail.

4 is an enlarged view showing a transport means of a scaffold structure for insulation work of an LNG cargo hold according to an embodiment of the present invention, and FIG. 5 is a perspective view of the transport means shown in FIG. It is a drawing.

In addition, 6 to 7 is an enlarged view showing each of the mast part and the connecting brace of FIG. 4 separately, and FIG. 8 is a view for explaining a method of dismantling the scaffold structure using the transfer means shown in FIG. 3 .

In this embodiment, the transport means 400 is installed in the upper center of the cargo hold 10, as shown in FIGS. 3 to 4 , a plurality of standard modules 100 and a plurality of cantilever modules when dismantling the scaffold structure. 200 and the like is provided to transport the lower bridge deck 353, and a module transfer unit 410 located in the upper center of the cross section of the cargo hold 10, and a cargo hold 10 to support the module transfer unit 410 It may include a mast part 430 connected to (or hanging) on the upper trunk deck (Td), and a connection brace part 450 for connecting the module transfer part 410 and the mast part 430. have.

The module transfer unit 410 is located in the upper center of the cross section of the yellow water hold 10 to lower the plurality of standard modules 100 and the plurality of cantilever modules 200 to the lower part of the cargo hold 10, or vice versa. ) can serve to elevate to the upper part.

Specifically, the module transfer unit 410 is coupled to the lower portion of the monorail platform 411 and the monorail platform 411 extending in the transverse direction from the upper center of the cross section of the cargo hold 10, as shown in FIG. 5 . It may include a monorail (or Runway beam) 413 and a plurality of trolley hoists (Trolley hoist) 415 provided to be slidable in the longitudinal direction of the monorail 413 .

The monorail platform 411 may be provided by welding or bolting a plurality of steel pipes having a circular or square pipe shape in horizontal, vertical, and diagonal directions.

In addition, the monorail platform 411 of this embodiment may be pre-installed inside the uppermost layer of the scaffold structure during the construction process of the heat insulation layer 20 in the cargo hold 10, that is, the insulation box work.

That is, after forming a separate recess structure inside the upper bridge deck 351 constituting the top layer of the scaffold structure, the monorail platform 411 is placed on the position to become a part of the top layer of the scaffold structure. can

The monorail 413 is coupled to the lower portion of the monorail platform 411 and may be provided as a traveling path on which a trolley hoist 415 to be described later slides.

The module transfer unit 410 of this embodiment has an appropriate size so that it can be moved to the outside of the cargo hold 10 through a side opening 10a formed on one side of the cargo hold 10 upon completion of the dismantling operation of the scaffold structure. It may be provided separately.

As an example, as shown in FIG. 5 , the module transfer unit 410 may be divided into six and a split joint 413a may be formed for each corresponding portion so as to be integrally coupled to each other through a bolt fastening method.

The trolley hoist 415 slides between both ends and the central part of the monorail 413 in the longitudinal direction, and is enlarged in the form of a module and has a weight of about 600 kg. A heavy-duty standard module 100 or cantilever module 200 may be provided to be transported to the lower bridge deck 353 provided on the third floor.

Referring to FIG. 5 , the trolley hoist 415 of this embodiment is shown to be installed one by one on both sides of the lower part in the longitudinal direction of the monorail platform 411, but the present invention is not limited thereto, and the dismantling time of the scaffold structure A plurality may be provided at the bottom of the monorail platform 411 to further shorten the.

As an example, the trolley hoist 415 is installed to be spaced apart from each other in the longitudinal direction (or transverse direction) and the width direction (or longitudinal direction) in the lower part of the monorail platform 411 to provide four standard modules 100 or It may be provided so that the cantilever module 200 can be transported.

In this embodiment, when a plurality of trolley hoists 415 are provided by being spaced apart from each other in the width direction as well as the longitudinal direction of the monorail platform 411, the standard module 100 or cantilever connected to each of the trolley hoists 415 In order to prevent a collision between the modules 200, the monorail platform 411 may be preferably formed to have a sufficient width not only in the transverse direction of the cargo hold but also in the longitudinal direction.

Here, a plurality of monorails 413 are installed at the lower portion of the monorail platform 411 to be spaced apart in the transverse and longitudinal directions, so that each of the plurality of trolley hoists 415 can be slid.

The transport means 400 of this embodiment is provided with a plurality of trolley hoists 415, and a plurality of standard modules 100 and a plurality of cantilever modules dismantled in the process of dismantling the scaffold structure are a plurality of lower bridge decks 353 at once. Can be lowered, thereby, can have the effect of shortening the dismantling work schedule of the scaffold structure.

The plurality of trolley hoists 415 are individually controlled to elevate structures such as the standard module 100 or the cantilever module 200 to the lower or upper part of the cargo hold 10, but the monorail platform ( In order to prevent the load from being biased to one side on 411), it may be preferable that the lifting operation be controlled to be simultaneously performed on the plurality of trolley hoists 415 .

The mast part 430 is for supporting the module transfer part 410 and may be connected to the trunk deck Td of the upper part of the cargo hold 10 , and more specifically, the gas provided in the upper trunk deck Td of the cargo hold 10 . The dome (Gas dome) (Gd) can be installed to extend in the vertical direction inside the long.

As shown in FIG. 6 , the mast portion 430 is elongated in the longitudinal direction (or vertical direction) of the gas dome Gd inside the gas dome Gd, and a plurality of spaced apart from each other so as to be parallel to each other. of the base mast member 431 and a plurality of connecting mast members 433 connecting the plurality of base mast members 431 in horizontal, vertical, and diagonal directions.

Each of the plurality of base mast members 431 and the plurality of connecting mast members 433 may be provided as a steel pipe in the form of a round or square pipe, and the plurality of connecting mast members 433 includes a plurality of base mast members 431 and It may be provided integrally through a bolt fastening method or a welding method.

Here, each of the plurality of base mast members 431 may be coupled to the inside of the gas dome Gd or the upper one side of the cargo hold 10 through a bolt fastening or welding method, etc., the plurality of base mast members 431 It may be preferable to be coupled so as not to interfere with the opening of the hatch cover of the gas dome Gd due to this.

As an example, as shown in FIG. 6 , a separate upper joint 431a is formed at the upper end of each of the plurality of base mast members 431 to form a hatch coaming of the gas dome Gd (unsigned). can be connected by bolting.

In this embodiment, the mast part 430 may be installed in the inner region of the gas dome Gd using a separate quay wall crane or winch (not shown) provided outside the cargo hold 10, and When the dismantling operation is completed, the connection brace part 450 to be described later may be separated and moved to the outside of the gas dome Gd by using a quay wall crane or the like.

Referring to FIG. 6 , the mast portion 430 of the present embodiment is illustrated in which four base mast members 431 are spaced apart in parallel to each other to have a rectangular prism shape, but the present invention is not limited thereto, and the mast portion In consideration of the structural stability of the 430, the base mast member 431 may be appropriately adjusted to have a triangular or polygonal prism shape.

The connection brace part 450 is for connecting the module transfer part 410 and the mast part 430, and the brace body 451 having a column shape and an end flange formed on both sides of the brace body 451 in the longitudinal direction ( 453, 455).

The end flanges 453 and 455 of this embodiment are formed at the lower end of the first end flange 453 coupled to the connection joint 411 and bolt fastening method formed on the upper surface of the monorail platform 411, and the mast portion 430. It may include a second end flange 455 coupled to the lower joint 431b by a bolt fastening method.

The connection brace part 450 of this embodiment is the connection joint 411a of the monorail platform 411 and the mast part through the first end flange 453 and the second end flange 455 formed on both sides of the brace body 451. It may be coupled to each of the lower joints 431b of the 430 .

In connecting the module transfer unit 410 and the mast unit 430, the connection brace unit 450 is a bolt-fastening by moving the connecting brace unit 450 directly on the uppermost floor of the scaffold structure before the dismantling operation of the scaffold structure. They must be designed to be of suitable weight and size to be installed in this manner.

In this embodiment, the brace body 451 may be provided as a steel pipe in the form of a round or square pipe, and as shown in FIG. 7 , the monorail platform 411 and the mast part 430 of the module transfer unit 410 . can be inclinedly connected to the

In addition, when the brace body 451 is provided as a pipe-shaped steel pipe, separate plates may be coupled to both ends of the brace body 451 to form end flanges 453 and 455 .

In this embodiment, the end flanges 453 and 455 have a size corresponding to the connection joint 411a formed on the upper surface of the monorail platform 411 and the lower joint 431b formed at the lower end of the mast part 430, respectively. In addition, depending on the installation direction of the connection joint 411a of the monorail platform 411 and the lower joint 431 of the mast part 430, it may be formed perpendicular to or inclined in the longitudinal direction of the brace body 451.

4 and 7, the connection brace part 450 of this embodiment is illustrated that a pair is provided in the left and right direction at the lower end of the mast part 430 based on the cross section of the cargo hold, but the present invention does not It is not limited, and one or more pairs may be provided according to the width direction of the monorail platform 411 and installed to be radially inclined downward from the lower end of the mast part 430 .

The transfer means 400 of this embodiment may further include a lifting means 470 for elevating or supporting the module transfer unit 410 pre-installed in the interior of the cargo hold 10 , that is, the upper bridge deck 351 . can

The lifting means 470 may be made of a wire (or rope) 471 and a lifting hoist 473 connected or coupled to the lower end of the mast 430, and a monorail platform at each end of the wire 471. A hook 471a that can be fastened to a ring (or a lifting eye) 411b formed on the upper surface of the 411 may be formed.

In this embodiment, when the dismantling operation of the scaffold structure is started, the hook 473a of the lifting hoist 473 is fastened to the hook 411b of the monorail platform 411 located on the uppermost layer of the scaffold structure. The 411 may be supported by the lifting means 470, and the operator directly moves the connecting brace 450 and connects the monorail platform 411 and the mast 430, thereby removing the uppermost layer of the scaffold structure. Even if it is, it is possible to maintain a state stably supported by the mast part 430 .

In addition, when the dismantling of the scaffold structure is completed, the connection brace 450 connecting the module transfer unit 410 and the mast 430 is removed, and then the lower part of the cargo hold 10 by the elevating means 470 . , Specifically, it can be lowered to the lower bridge deck 353 formed on the third floor of the scaffold structure, and it can be divided into a plurality of pieces and disassembled again on the lower bridge deck 353 serving as a distribution platform.

Referring back to FIG. 6 , the lifting means 470 of this embodiment is connected to the lower end of the mast portion 430 , that is, the lower end of each of the plurality of base mast members 431 and provided with four hoists 473 . Although shown, the present invention is not limited thereto, and in consideration of the number of the base mast member 431 or whether the monorail platform 411 can be stably elevated or supported, the number of elevating means 470 is It can be applied in various ways.

On the other hand, the transport means 400 of this embodiment has a structure in which the monorail platform 411 is supported by the mast part 430, but may be vulnerable to stress applied in a direction eccentric from the center of the monorail platform 411. .

When the load acts on the monorail platform 411 biased to one side, the module transfer unit 410 including the monorail platform 411 may be rotated in the direction in which the load is applied, such as deflection or inclination. , there is a risk that the connection brace part 450 connecting the monorail platform 411 and the mast part 430 is damaged, or the monorail platform 411 is separated from the mast part 430 and falls downward.

Therefore, the transport means 400 of this embodiment, as shown in FIGS. 3 to 5, to prevent the monorail platform 411 from being tilted or rotated is formed extending upwardly from the top of the monorail platform 411, Rotation prevention means 490 in close contact with the insulation box (or invar) installed on the upper inner wall of the cargo hold 10 may be additionally installed.

The rotation preventing means 490 may be formed of a plurality of adhesion members 491 that are installed to be spaced apart from each other in the transverse and longitudinal directions on the monorail platform 411 .

Each of the plurality of adhesion members 491 is supported by an insulation box installed on the upper inner wall of the cargo hold 10 when an asymmetric load is applied to the monorail platform 411, and the module transfer unit 410 including the monorail platform 411 is inclined. It can be prevented from being lost or rotated.

In this embodiment, when a local stress is applied to the heat insulating layer 20, the heat insulating layer 20 is damaged and there is a risk of lowering the heat insulating performance. By making the surface contact with the heat insulating layer 20, the monorail platform 411 is prevented from being tilted or rotated, and the damage to the heat insulating layer 20 caused by the pressing force of the close contact member 491 can be minimized. Absorber) can play a role.

In this embodiment, each of the plurality of contact members 491 may have a cylindrical or polygonal column shape, and similarly to the monorail platform 411 , may be provided as a pipe-shaped steel pipe.

Here, when the adhesion member 491 is provided in the form of a hollow pipe, a separate plate (unsigned) having a predetermined width is coupled to the upper end of the adhesion member 491 through bolt fastening or welding method. may be desirable.

4 to 5, the adhesion member 491 of this embodiment is shown to be spaced apart from each other in the transverse and longitudinal directions on the upper surface of the monorail platform 411 to provide a total of four, but the adhesion member 491 The installation location and number of is not limited thereto, and if the module transfer unit 410 including the monorail platform 411 can be sufficiently prevented from being tilted or rotated, it may be applicable to various other structures.

As an example, the plurality of contact members 491 may be installed to be spaced apart from each other in the lateral and longitudinal directions at an approximately central portion of the upper monorail platform 411, as shown in FIG. 4, and the monorail platform 411 Each may be installed for each corner area of the upper portion, a plurality may be installed for each tip of the outer edge of the upper monorail platform 411.

On the other hand, when the dismantling operation of the scaffold structure is completed, the insulation box or invar state is inspected to check the damage to the support point of the monorail platform 411 , that is, the portion where the plurality of contact members 490 are in close contact on the insulation layer 20 . (Inspection) may be required.

To this end, in the transfer means 400 of this embodiment, a ladder 435 may be installed in the mast portion 430 so that the operator can access the corresponding area of the module transfer unit 410, On each of the upper surface and the edge of the monorail platform 411, a step 417 made of a material such as plywood or a steel plate and a handrail 419 for checking the insulation box are further installed. can

In this embodiment, the step 417 and the inspection handrail 419 are designed in consideration of the worker's accessibility to inspect the insulation box 21 and the invar state installed on the upper inner wall of the cargo hold 10 . It may be preferable, and may be installed over the entire upper surface of the monorail platform 411 , or may be installed only to the portion where the plurality of adhesion members 491 are formed in the center of the upper surface of the monorail platform 411 .

Here, a plurality of handrails for inspection 419 may be installed along the edge of the step 417 installed on the upper surface of the monorail platform 411 , and each of the plurality of inspection handrails 419 is a monorail It may be vertically fixed to the upper surface of the platform 411 , and may be provided in a removable type that can be separated from the monorail platform 411 and removed when the dismantling operation of the footrest is completed.

Hereinafter, a method of dismantling the scaffold structure using the above-described transfer means 400 will be briefly described.

The method of dismantling the scaffold structure for the construction work of the heat insulation layer 20 inside the cargo hold according to this embodiment is a method of dismantling the scaffold structure installed on the inner wall of the cargo hold for the construction work of the heat insulation layer 20 inside the cargo hold. ) installing a transport means 400 for transporting the plurality of standard modules 100 and the plurality of cantilever modules 200 in the upper center of the upper center, and the standard module 100 or cantilever separated to the transport means 400 The steps of connecting the module 200 and transferring the standard module 100 or the cantilever module 200 to the lower part of the cargo hold 10, and the standard module 100 or the cantilever module transferred to the lower part of the cargo hold 10 ( It may include moving the 200 to the outside of the cargo hold 10 through the side opening (10a) provided on one side of the cargo hold (10).

In the step of installing the transport means 400, the monorail 413 and a plurality of trolley hoists 415 are provided at the lower part of the monorail platform 411 which is located on the uppermost layer of the scaffold structure and is formed to extend long in the lateral direction. The step of preparing the transfer unit 410, the step of installing the mast unit 430 inside the gas dome Gd provided in the cargo hold 10 upper trunk deck Td, and the module transfer unit 410 is the mast unit 430 ) may include the step of installing a connection brace portion 450 to be supported by.

In the step of installing the connection brace unit 450 , the step of supporting the monorail platform 411 of the module transfer unit 410 using a separate elevating means 470 connected to the mast unit 430 and the monorail platform 411 ) may include connecting both ends of the connection brace unit 450 to the upper surface of the monorail platform 411 and the lower end of the mast unit 430 in a state supported by the elevating means 470 , respectively.

In this embodiment, before the step of transporting the standard module 100 or the cantilever modules 200 and 600 to the lower part of the cargo hold 10, the standard module 100 or the cantilever module 200 using a separate dismantling means. It may further include the step of moving the cargo hold 10 to the central portion of the cross-section.

Here, the dismantling means may be a mobile cart (Mc) having an elevating part having a lifting function on a body part having a driving means so as to be able to move within the scaffold structure forming a plurality of layers (see FIG. 17 ). ).

As described above, the module landing part 530 may be installed in the central part of the cross-section of the cargo hold 10 , and the module landing part 530 is located above or below the plurality of standard modules 100 and the standard module 100 . It may be composed of a post 310 and a diagonal brace 330 that are coupled.

In this embodiment, the separated standard module 100 or cantilever module 200 is connected to the trolley hoist 415 of the transport means 400 on the module landing part 530, and serves as a platform structure to serve as a logistics transport table. It can be transferred to the lower bridge deck 353 of 350 .

In the dismantling method of the scaffold structure according to an embodiment of the present invention, after the dismantling operation of the scaffold structure using the conveying means 400 is completed, the step of dismantling the conveying means 400 and moving it to the outside of the cargo hold 10 . may include more.

In the step of dismantling the transfer means 400 , the module transfer unit 410 may be separated from the mast unit 430 and moved to the outside of the cargo hold 10 , specifically, the module transfer unit 410 and the mast unit 430 . ) removing the connection brace part 450 connecting the ), transporting the module transfer part 410 to the lower part of the cargo hold 10 using the lifting means 470 , and the module from the lower part of the cargo hold 10 . It may include dividing the transfer unit 410 into a plurality and then moving it to the outside of the cargo hold 10 through the side opening 10a provided on one side of the cargo hold 10 .

Here, the module transfer unit 410 can be lowered to the lower part of the cargo hold, specifically, the lower bridge deck 353 formed on the third floor of the scaffold structure by the elevating means 470, and the platform structure ( It may be divided into a plurality on the lower bridge deck 353 of the 350).

In this embodiment, in the step of dismantling the transport means 400, the mast part 430 from which the module transport part 410 is separated is moved to the gas dome ( It may further include the step of moving to the outside of Gd).

In the method of dismantling the scaffold structure according to an embodiment of the present invention, a plurality of standard modules 100 or a plurality of cantilever modules 200, etc. can be transferred to the lower part of the cargo hold at the same time, thereby significantly reducing the time required for dismantling the scaffold structure.

In addition, it is possible to move a part of the enlarged scaffold structure by the transfer means 400 provided inside the cargo hold 10 without a transfer device such as a quay wall crane or a winch provided on the outside of the cargo hold 10, so that the quay wall crane It can have an advantageous effect that no waiting time is required.

In addition, since each of the standard module 100 and the cantilever module 200 enlarged in the form of a module can be easily disassembled using a separate dismantling means, the manual work of the operator and handling of heavy objects in the process of installing or dismantling the scaffold structure is minimized. Thus, it is possible to have a beneficial effect of preventing the musculoskeletal disease of the worker and reducing the risk of various safety accidents.

9 is a perspective view showing the main configuration of a scaffold structure for insulation work of an LNG cargo hold in accordance with an embodiment of the present invention, FIG. 10 is a schematic side view of FIG. 9, and FIGS. 11 to 13 are Regions 'A', 'B', and 'C' of FIG. 9 are enlarged views, respectively.

In addition, FIG. 14 is a view showing the plane of the scaffold structure based on the cross section X-X' of FIG. 3 , and FIG. 15 is the port side wall surface inside the cargo hold based on the plane of the scaffold structure shown in FIG. 14 . It is a view showing a perspective view by separating the scaffold structure to be installed, and FIG. 16 is an enlarged view of the area 'D' of FIG. 15 .

As described above, the scaffold structure for the LNG cargo hold insulation work according to an embodiment of the present invention is a scaffold structure for the construction work of the heat insulation layer 20 inside the cargo hold 10, and is spaced apart from the inner wall surface of the cargo hold 10. It may include a plurality of standard modules 100 constituting three layers, and a plurality of cantilever modules 200 coupled to each of the plurality of standard modules 100 so as to be adjacent to the inner wall surface of the cargo hold 10 .

Hereinafter, the standard module 100 and the cantilever module 200 of this embodiment will be described in detail.

As shown in FIGS. 9 to 10 , the standard module 100 includes a pair of main frames 110 provided to be spaced apart from each other in one direction, and a pair of main frames 110 coupled to both ends of the main frame 110 . A pair of connecting frames 130 that integrally connect the frames 110 and a pair of main frames 110 are spaced apart from each other in the longitudinal direction of the main frame 110 and installed in parallel with the connecting frame 130 A plurality of connecting members 150 may be included.

The standard module 100 is a pair of main frames 110 and a pair of connection frames 130 are combined to have standardized dimensions (size), a width of approximately 2500mm and a length of 3500mm (length) A rectangular frame structure can be achieved.

Here, the width may mean a longitudinal dimension of the connection frame 130 , and the length may mean a longitudinal dimension of the main frame 110 .

In addition, a footrest plate P1 may be additionally installed on the main frame 110 , the connecting frame 130 , and the upper surfaces of the connecting member 150 .

The scaffold plate P1 may be made of a material such as plywood or a metal plate, similar to the step 417 installed on the upper surface of the monorail platform 411 , and is fixedly installed in the standard module 100 to the standard module It may be desirable to be provided integrally with (100).

In addition, the scaffold plate P1 may be made of a single plate having the same or similar dimensions as the standardized size of the standard module 100, and is provided with a plurality of plates having uniformly divided or various dimensions to the standard module 100. They may be respectively fixedly installed on the formed footrest fixtures (unsigned).

Here, the pair of main frames 110, as shown in FIGS. 9 to 10, can have a truss structure so as to be able to achieve weight reduction and to ensure structural stability to sufficiently withstand vertical bending deformation. In addition, each of the pair of connecting frames 130 and the plurality of connecting members 150 may be provided as a steel pipe (or square pipe) in the form of a square pipe having a square cross section.

Referring to FIG. 9 , the main frame 110 formed in the left and right direction of the cargo hold 10 , that is, in parallel with the transverse direction, has a truss structure, but the present invention is not limited thereto, and a pair of main frames A pair of connecting frames 130 for integrally connecting the 110 may be formed to have a truss structure, and the pair of main frames 110 may be made of a steel pipe.

In this embodiment, the standard module 100 of this embodiment, it is preferable to selectively apply the truss structure to the pair of main frames 110 or the pair of connecting frames 130 according to the installation position inside the hull can

Specifically, based on the plane shown in FIG. 14, in the standard module (including the standard module 100 positioned in the inner corner area of the hull) positioned adjacent to the left and right sides of the hull (100), one parallel to the lateral direction A truss structure may be applied to the main frame 110 of the pair, and in the standard module 100 positioned adjacent to the bow and stern sides of the hull, a connection frame parallel to the longitudinal direction (the longitudinal direction of the hull connecting the bow and stern) ( 130), a truss structure may be applied.

Hereinafter, in describing the present invention, as shown in FIG. 9 , a pair of main frames 110 have a truss structure, and a pair of connecting frames 130 and a plurality of connecting members 150 are each formed of a steel pipe. It will be described as being provided with .

Specifically, the main frame 110, a pair of vertical members 111 coupled to the pole 310, and a pair of vertical members 111 are formed to extend horizontally in a direction facing each other, a first horizontal A second horizontal member having the same length as the member 112 and the first horizontal member 112 and spaced apart from the first horizontal member 112, both ends of which are connected to the outer circumferential surface of the pair of vertical members 111 ( 113) and a plurality of inclined members 114 formed between the first horizontal member 112 and the second horizontal member 113 may be included.

The vertical member 111 may be provided as a steel pipe in the form of a circular pipe having the same outer diameter as the post 310, and on one side of the outer circumferential surface of the vertical member 111, a frame coupling hole (Coupler) c1 (see FIG. 12) is provided. It is formed so that the ends of the pair of connection frames 130 may be coupled to each other in a bolt fastening manner.

In this embodiment, some of the plurality of standard modules 100, the number of posts 310 coupled to the upper or lower portion of the corresponding standard module 100, or on any of the plurality of layers of the main structure MS The position of the vertical member 111 may be applied differently depending on whether it is installed or the like, and one or more vertical members 111 may be further installed in the longitudinal direction of the main frame 110 .

The plurality of connection members 150, similar to the connection frame 130, a plurality of main frames 110 are spaced apart from each other along the longitudinal direction of the first horizontal member 112 in a direction facing each other. It may be coupled to the connecting rod coupler (unsigned) by a bolt fastening method.

In this embodiment, it is preferable that the vertical member 111, the first horizontal member 112, the second horizontal member 113, and the inclined member 114 are integrally formed through a bolt fastening method or a welding method, etc. can

In addition, the first horizontal member 112, the second horizontal member 113, and the plurality of inclined members 114 except for the vertical member 111, the same as the connection frame 130 or the connection member 150, a quadrangle It may be preferable to provide a steel pipe in the form of a square pipe having a cross section.

Here, the first horizontal member 112 , the second horizontal member 113 , and the inclined member 114 may have different cross-sectional areas. For example, the first horizontal member 112 may have the same cross-sectional area as the connection frame 130 or the connection member 150 , and the second horizontal member 113 and the inclined member 114 may include the first horizontal member ( 112) may be provided as a steel pipe having a smaller cross-sectional area.

Referring to FIG. 11 , the main frame 110 of this embodiment has an inner diameter corresponding to the outer diameter of the post 310 by expanding the diameter at the upper end or the lower end of the vertical member 111 , and one side of the post 310 inside It may further include a socket part 115 into which the end is inserted and installed, and in a state in which one end of the post 310 is inserted into the socket part 115, the bolt in a direction perpendicular to the outer circumferential surface of the socket part 115 is tightened. By fastening, the post 310 can be fixed to the standard module 100 .

Here, the post 310 is installed with one end inserted into the inside of the socket unit 115 to extend to the upper or lower portion of the standard module 100 , and a plurality of standard modules 100 by the post 310 . and a plurality of cantilever modules 200 coupled to one side of each of the plurality of standard modules 100 may form a plurality of layers at regular intervals in the vertical direction inside the cargo hold 10 .

In addition, at the other end of the post 310 , a female socket whose diameter is expanded to have an inner diameter corresponding to the outer diameter of the vertical member 111 , similarly to the socket part 115 formed at one end of the vertical member 111 . The part 311 may be formed, and the end of the vertical member 111 may be inserted into the female socket part 311 .

At this time, both ends of the diagonal brace 330 to be coupled to the corner where the second horizontal member 113 and the vertical member 111 of the main frame 110 meet and the bracket c5 formed on the outer circumferential surface of the socket part 115, respectively. can

In the main frame 110 of this embodiment, the pair of vertical members 111 in any one of the pair of vertical members 111 are formed to protrude from the outer peripheral surface of the opposite side in the direction facing each other, and the end has a flange shape. A pair of transverse flange portions 117 may be further included.

A pair of transverse flange portions 117, as shown in FIG. 12, are spaced apart from the upper protrusion 117a protruding from the upper outer circumferential surface of the vertical member 111 and the upper protrusion 117a downward and are vertical A lower protrusion 117b protruding from the lower outer circumferential surface of the member 111 may be included.

Here, each of the upper protrusion 117a and the lower protrusion 117b is a separate plate (unsigned) having a predetermined width at the distal end, similar to the contact member 451 of the transfer means 400, is bolted or welded. may be joined to form a flange.

In addition, although not shown in the drawing, the main frame 110 of this embodiment is an outer circumferential surface opposite to the direction in which the connecting frame 130 is coupled in the vertical member 111 , that is, a transverse plane from the outer circumferential surface of the vertical member 111 . It may further include a pair of longitudinal flange portions (unsigned) that are formed to protrude at a position perpendicular to the branch 117 and have a flange shape at the distal end.

In this embodiment, the transverse flange portion 117 and the longitudinal flange portion are provided to couple the cantilever module 200 to the standard module 100 , and a detailed coupling structure with the cantilever module 200 will be described later. decide to do

The standard module 100 of this embodiment has a handrail (or safety handrail) on the outer surface of the main frame 110 or the connection frame 130 forming the edge of the footrest plate P1, that is, a rectangular frame structure. can be installed.

In this embodiment, the handrail installed in the standard module 100 is similar to the handrail 419 for inspection installed in the transfer means 400, the footrest plate P1 installed on the upper surface of the standard module 100. It may be a fixed handrail 170a (refer to FIG. 9) that is vertically fixed and installed on the scaffold plate P1 from one side of the edge, but as shown in FIG. 15, the scaffold plate in a state installed at the edge of the scaffold plate P1 It may be preferable that it is a foldable handrail 170 that can be rotated in the central direction of (P1) and can be placed on the upper surface of the footrest plate (P1).

In this embodiment, a detailed description of the foldable handrail 170 installed in the standard module 100 will be described later.

As shown in FIGS. 9 to 10 , the cantilever module 200 includes a pair of sub-frames 210 provided to be spaced apart from each other, and a pair of sub-frames 210 between the pair of sub-frames 210 . ) are interconnected and integrated, and a plurality of support members 230 for supporting the footrest plate P2 fixed thereon by being coupled along the longitudinal direction of the sub-frame 210 may be included.

Here, the cantilever module 200 may be a transverse cantilever module disposed adjacent to the port side or starboard side wall inside the cargo hold 10 with respect to the plane shown in FIG. 14 , and , The scaffold structure of this embodiment may further include a longitudinal cantilever module (Longitudinal cantilever module) 600 disposed to be adjacent to the fore-side or stern-side wall surface inside the cargo hold (10).

In describing the present invention, the transverse cantilever module 200 will be first described with reference to FIGS. 9 to 10 , and the longitudinal cantilever module 600 will be described later.

Referring back to FIG. 9 , the transverse cantilever module 200 includes a pair of first sub-frames 210 provided to be spaced apart from each other in one direction, and a pair of first sub-frames 210 between the pair of first sub-frames 210 . It may include a plurality of first support members 230 for interconnecting the first sub-frame 210 to be integrated.

In the transverse cantilever module 200 of this embodiment, similarly to the standard module 100 , a footrest plate P2 is provided on the upper surfaces of the pair of first sub-frames 210 and the plurality of first support members 230 . It may be fixedly installed, and may be provided integrally with the transverse cantilever module 20 .

The pair of first sub-frames 210 may have a truss structure to reduce weight and improve structural stability, similar to the main frame 110 of the standard module 100, and a plurality of first support members ( 230) each may be provided as a steel pipe in the form of a square pipe having a square cross section.

The first sub-frame 210 includes a first upper streak member 211 extending long in the horizontal direction, a first lower chord member 213 spaced apart from the first upper chord member 211 below, and a first upper chord member. It may include a plurality of first brace members 215 for connecting between the (211) and the first lower side member (213).

The first upper chord member 211 may be provided as a steel pipe in the form of a square pipe having the same cross-sectional area as the first supporting member 230 , and the first lower chord member 213 and the first bracing member 215 are the first upper chord members 215 . It may be provided as a steel pipe in the form of a square pipe having a smaller cross-sectional area than the member 211 .

As shown in FIG. 13 , the plurality of first support members 230 are spaced apart from each other along the longitudinal direction of the first upper member 211 in the direction in which the pair of first sub-frames 210 face each other. It may be coupled to a plurality of support coupling holes (c3) to be coupled by a bolt fastening method.

In this embodiment, it may be preferable that the first upper and lower chord members 211, the first lower chord members 213, and the plurality of first brace members 215 are integrally connected through a bolt fastening method or a welding method. .

On the other hand, one end of the first upper chord member 211 and the first lower chord member 213 is the upper protrusion 117a and the lower protrusion 117b of the transverse flange portion 117 formed in the main frame 110, respectively. It may have a flange shape corresponding to the distal end (see FIG. 12 ).

In this embodiment, each of the one end of the first upper chord member 211 and the first lower chord member 213 is a flange formed on each of the upper protrusion 117a and the lower protrusion 117b of the transverse flange 117 and It may be preferable that separate plates (unsigned) having corresponding widths are bolted or welded to form the flange.

That is, in the transverse cantilever module 200 of this embodiment, one end of the first upper chord member 211 and the first lower chord member 213 is connected to an upper protrusion 117a and a lower protrusion ( 117b) can be coupled by bolting the flanges to each other, and the self-weight of the transverse cantilever module 200 provided in the form of a cantilever by this coupling method and the transverse cantilever module ( 200) can not only transmit the load applied to the standard module 100, but also have the effect of minimizing deflection at the end of the transverse cantelever module 200.

At this time, the first lower chord member 213 may be provided to have a shorter length than that of the first upper chord member 211 , and for this reason, the lateral cantilever module 200 has a side surface at its end from top to bottom. It may have a gradually tapering shape.

As shown in FIG. 10 , the cantilever module 200 of this embodiment includes the inner wall surface of the cargo hold 10 at the end of the pair of first sub-frames 210 , specifically, the first upper pole member 211 . It may further include a first extension member 250 extending toward the extension, a telescopic panel (TP) may be installed on the upper surface of the extension member 250 .

In the present embodiment, the first extension member 250 is provided so that the length extending (or protruding) from the cantilever module 200 can be varied, and is a detachable type installed on the upper surface of the first extension member 250 . The panel TP may be provided in a plurality of divisions along the longitudinal direction of the first extension member 250 .

In the scaffold structure according to an embodiment of the present invention, it is necessary to adjust the distance from the inner wall surface of the cargo hold 10 according to the installation situation of the insulation box 21 inside the cargo hold 10, a plurality of detachable panels (TP) It is installed on the upper part of the first extension member 250 and the upper surface thereof may have the same height as the upper surface of the scaffold plate P2 of the cantilever module 200, and the first extension member during the installation of the insulation box inside the cargo hold 10 An appropriate number of detachable panels TP may be installed or separated according to the extended length of the 250 .

The main structure MS of this embodiment connects between the other transverse cantilever modules 200 disposed adjacent to any one of the plurality of transverse cantilever modules 200 with respect to the plane shown in FIG. 14 . It may further include a plurality of lateral infill (infill) adjustment unit (510).

In addition, by connecting between the main structure Ms of this embodiment, any one of the plurality of longitudinal cantilever modules 600 and the other longitudinal cantilever module 600 disposed adjacently, a plurality of transverse cantilever modules ( 200), a plurality of longitudinal cantilever modules 600, and a plurality of longitudinal infill adjustment units 710 provided to surround the inner wall surface of the cargo hold 10 together with a plurality of transverse infill adjustment units 510 may be further included. Also, the longitudinal infill adjustment unit 710 will be described later together with the longitudinal cantilever module 600 .

As shown in FIG. 9 , the lateral infill adjustment unit 510 has a bar shape and the pair of first sub-frames 210 face each other in opposite directions. ) may include a plurality of lateral spacing adjusting members 511 coupled to each.

Each of the plurality of lateral spacing adjusting members 511, similar to the distance adjusting member 391 of the lateral distance adjusting unit 390, is preferably provided as a single piece to enable installation or dismantling through the manual operation of the operator can

That is, the transverse infill adjustment unit 510 of the present embodiment includes a plurality of modules such that the standard module 100 and the transverse cantilever module 200 that are modularized to a certain size can be continuously used even when the size of the cargo hold 10 is applied differently. It can serve as a buffer by changing the length of the transverse spacing adjustment member 511 of dogs, and can be easily interchanged with other ships.

Each of the plurality of lateral spacing adjusting members 511 may be positioned on a longitudinal extension line of each of the plurality of support members installed between the pair of first sub-frames 210 .

In this embodiment, the plurality of lateral spacing adjusting members 511 may be designed to have the same or equivalent strength as the plurality of supporting members, and the upper surface of the lateral spacing adjusting member 511 has a scaffold plate P3 (Fig. 15) may be additionally installed.

Here, a detachable panel TP may be installed between the transverse infill adjustment unit 510 and the inner wall surface of the cargo hold 10 .

13, at both ends of the lateral spacing adjusting member 511, a wedge-type fixing pin 511a may be provided to facilitate dismantling of each of a plurality of spacing adjusting members provided separately, Both ends of the lateral spacing adjusting member may be hooked and fixed to a plurality of fixing pin coupling holes c4 formed on the side opposite to the portion where the support coupling holes c3 are formed in the first upper chord member 211 .

On the other hand, in the scaffold structure for the insulation work of the LNG cargo hold according to an embodiment of the present invention, a safety handrail, that is, a handrail may be installed in accordance with the industrial safety and health standards (Article 13 of the Rules for the Industrial Safety and Health Standards).

In this embodiment, in the standard module 100, as shown in FIG. 15, the standard module 100 is rotated from the edge of the scaffold plate P1 installed on the upper surface to the center direction of the scaffold plate P1, so that the scaffold A foldable handrail 170 that can be placed on the upper surface of the plate P1 may be installed, and the transverse infill adjustment unit 510 may be installed and detached from the transverse spacing adjusting member 511 provided separately. A bee handrail (Removal type handrail) 513 may be installed.

Hereinafter, the folding handrail 170 installed in the standard module 100 will be described in detail with reference to FIGS. 15 to 16 .

The folding handrail 170 is, as shown in FIGS. 15 to 16 , the end of the socket-type handrail coupling port c2 formed on the outer surface of the main frame 110 or the connection frame 130 . A handrail post 171 that is inserted and extended by a certain length in the upper direction, and the standard module 100 that is vertically coupled to the handrail post 171 to form a plurality of layers on the open side It may be made of a handrail 173 positioned, and a toe board (or, kick plate) 175 installed on the edge of the foot plate P1.

A pair of handrail posts 171 may be provided and installed to be spaced apart from each other in the longitudinal direction of the main frame 110 or the connection frame 130, and the handrail 173 is a footrest plate P1 to prevent a worker from falling. ) and installed to have a sufficient height from the top, it can consist of an upper handrail and an intermediate handrail depending on the installation height.

Here, the toe plate 175 may preferably have a height of 10 cm or more from the upper surface of the foot plate P1 to prevent an object such as a member or construction equipment from falling to the bottom.

The configuration of the balustrade post 171, the balustrade 173, and the toe plate 175 is a well-known technique and detailed description thereof will be omitted.

In this embodiment, the foldable handrail 170 may further include an insertion piece 177 coupled to the distal end of the handrail post 171 and positioned in the handrail coupling hole c2.

The insertion piece 177 may have a plate shape having a narrow width and a long length, and a guide slot 177a in the form of a long hole in the longitudinal direction thereof may be formed through a central portion thereof.

The insert piece 177 of this embodiment is a handrail post by a fitting pin 179 vertically penetrating the handrail coupler c2 and the insert piece 177 in a state positioned in the handrail coupler c2. (171) is prevented from being separated, and can be moved in a certain range in the vertical direction by the guide slot (177a) in the form of a long hole, and the handrail post (171) and the handrail (173) are rotated by the upper part of the scaffold plate (P1). It can serve as a guide so that it can be placed on the

At this time, the handrail post 171 is lifted and the fitting pin 179 is rotated around the hinge while the lower end of the guide slot 177a is caught on the fitting pin 179, that is, the folding handrail 170 is the foot plate ( It may be preferable that a cut-out groove (not shown) is formed at the upper end of the handrail coupler c2 so that it can be rotated in the direction P1) and placed on the upper surface of the footrest plate P1.

In addition, also on the upper end of the toe plate 175, similarly to the handrail coupler (c2), an incision groove (175a) is formed so that the insertion piece 177 can be fitted or inserted when the insertion piece 177 is rotated. can be

As an example, the fitting pin 179 may be a bolt that vertically penetrates the handrail coupling hole c2 and the insertion piece 117 and is nut-fastened, and more specifically, may be an M12 bolt having a diameter of 12 mm. , its fastening position may be located above the footrest plate (P1) so that the handrail post 171 and the handrail 173 can be placed on the footrest plate (P1) when the insert is rotated.

In addition, the guide slot 177a formed in the insertion piece 177, the width (or width) of the long groove may be the same or similar to the diameter of the fitting pin 179, that is, the M12 bolt, and the fitting pin 179 ) may be preferably extended long enough downward in the handrail coupler c2 so as not to be rotated or shaken in a state hung on the upper side of the guide slot 117a.

In the case of installing a handrail for the safety of an operator in the process of insulation work inside the cargo hold 10, the scaffold structure for LNG cargo hold insulation work according to an embodiment of the present invention has a folding hand vertically to the scaffold plate P1. When the rail 170 is erected and fixed, and when the scaffold structure is dismantled, it can be folded by lifting the folding handrail 170 and rotating it in the center direction of the scaffold plate P1.

A plurality of foldable handrails 170 of this embodiment may be installed along the edge of the scaffold plate P1, and rotate in the center direction of the scaffold plate P1 in a state installed perpendicular to the upper surface of the scaffold plate P1. to be mutually stacked on the upper surface of the scaffold plate (P1).

Here, the foldable handrail 170 may be installed on both the pair of main frames 110 and the pair of connection frames 130 , or a cantilever module among the pair of connection frames 130 is installed. Except for one connection frame 130 positioned in the direction of being, it may be installed in each of the pair of main frames 110 and the other connection frame 130 .

The scaffold structure for LNG cargo hold insulation work according to an embodiment of the present invention includes a foldable handrail 170 that is foldably installed on the standard module 100, and the standard module 100 in the process of installing and dismantling the scaffold structure. Separately, it is possible to omit the operation of transporting the handrail and the operation of coupling or removing the handrail to the standard module 100, thereby reducing the number of working hours and improving convenience.

Referring back to FIG. 14 , the scaffold structure for insulation work of an LNG cargo hold according to an embodiment of the present invention is a stair structure 550 for enabling an operator to access from the lowest floor to the uppermost floor of the standard module 100 constituting a plurality of layers. ) and an elevator unit 570 may be further included.

In this embodiment, the staircase structure 550 is, as shown in FIG. 14 , a standard module 100 disposed on both sides (left and right side) walls of the central section of the cargo hold 10 among the plurality of standard modules 100. It may be installed between the module and may be positioned close to the landing unit 530 , and at least one may be installed on the port side and the starboard side of the cargo hold 10 , respectively.

As shown in FIG. 14 , the elevator unit 570 is to be installed in the bow direction of some of the plurality of longitudinal cantilever modules 600 installed on the stern side of the cargo hold 10 based on the plane of the cargo hold 10 . can

At this time, the elevator unit 570 may be connected to the longitudinal cantilever module 600 to be described later by hanging on the upper trunk deck Td of the cargo hold 10 , and a plurality of installed on the stern side of the cargo hold 10 . Some of the standard modules 100 may be arranged to surround the other side except for one side of the elevator unit 570 connected to the longitudinal cantilever module 600 .

In the scaffold structure for insulation work of an LNG cargo hold according to an embodiment of the present invention, not only the worker can access from the lowest to the top floor of the standard module 100 constituting a plurality of layers through the elevator unit 570, but also the scaffold During the dismantling of the structure, it may be possible to transfer the members provided as a single unit.

17 is a perspective view showing the scaffold structure installed in the corner of the cargo hold internal space based on the plane of the scaffold structure shown in FIG. 14, and FIG. 18 is a perspective view of the back side of the scaffold structure shown in FIG. 19 is an enlarged view of the region 'E' shown in FIG. 18 .

As shown in FIG. 14, the scaffold structure for the LNG cargo hold insulation work according to an embodiment of the present invention is transverse to one side and the other side of the standard module 100 spaced apart from the corners of the cargo hold 10 internal space. The directional cantilever module 200 and the longitudinal cantilever module 600 may be installed together.

That is, the scaffold structure for the LNG cargo hold insulation work according to an embodiment of the present invention is spaced apart from the corner of the cargo hold 10 inner space, and a plurality of posts 310 are coupled to the upper or lower portions to form a plurality of layers. and a transverse cantilever module 200 coupled to one side of the standard module 100 and disposed adjacent to the port side or starboard side wall inside the cargo hold 10 from the corner of the cargo hold 10 And, it may include a longitudinal cantilever module 600 coupled to the other side of the standard module 100 so as to be adjacent to the front side or stern side wall inside the cargo hold 10 from the corner of the cargo hold 10 .

In addition, the diagonal brace 330 is equally installed between any one of the plurality of standard modules 100 installed in the corner of the cargo hold 10 and the other standard module 100 positioned above or below. can be

Here, since the standard module 100 and the transverse cantilever module 200 have the same configuration as described above, a detailed description thereof will be omitted and the longitudinal cantilever module 600 will be briefly described first.

As shown in FIG. 18, the longitudinal cantilever module 600 has a shorter length than the first sub-frame 210 of the transverse cantilever module 200, and a pair of second sub-frames ( 610), an intermediate support 630 extending horizontally from the center between the pair of second sub-frames 610 and the pair of second sub-frames 610, and a pair of second sub-frames 610 and a plurality of second support members 650 connecting the intermediate support 750 to each other.

The longitudinal cantilever module 600 of this embodiment, similar to the transverse cantilever module 200 , includes a pair of second sub-frames 610 , an intermediate support 630 , and a plurality of second support members 650 . A scaffold plate (unsigned) may be fixedly installed on the upper surface, and the pair of second sub-frames 610 may have a truss structure to reduce weight and improve structural stability.

The second sub-frame 610, similarly to the first sub-frame 210, may include a second upper chord member 611, a second lower chord member 613, and a plurality of second bracing members 615, , the second upper chord member 611 , the second lower chord member 613 , and the plurality of second brace members 615 may be integrally connected through a bolt fastening method or a welding method.

The second upper chord member 611 , the intermediate support 630 , and the plurality of second support members 650 may be provided as a steel pipe in the form of a square pipe having the same cross-sectional area, and the second lower chord member 613 and the plurality of second support members 650 may be provided. The second brace member 615 may be provided as a steel pipe in the form of a square pipe having a smaller cross-sectional area than the second upper pole member 611 .

In addition, the second lower chord member 613 may have a shorter length than that of the second upper chord member 611 , so that the longitudinal cantilever module 600 has a tapered side surface at the end from the upper side to the lower side. can have

A plurality of second support members 650, similar to the first support member 230, along the longitudinal direction of the second upper member 611 in a direction in which the pair of second sub-frames 610 face each other. It may be coupled to the formed plurality of support coupling holes (unsigned) by a bolt fastening method.

In addition, one end of the second upper chord member 611 and the second lower chord member 613 are ends of an upper protrusion (unsigned) and a lower protrusion (unsigned) of the longitudinal flange portion formed on the main frame 110, respectively. may have a flange shape corresponding to .

That is, in the longitudinal cantilever module 600 of this embodiment, similarly to the transverse cantilever module 200, one end of the second upper chord member 611 and the second lower chord member 613 is attached to the upper part of the longitudinal flange. By attaching the protrusion and the lower protrusion to each of the protrusions and lower protrusions in a bolted manner, the weight of the longitudinal cantilever module 600 and the operator's load acting on the longitudinal cantilever module 600 can be transmitted to the standard module 100 as well as , can have the effect of minimizing sagging at the end.

In addition, the longitudinal cantilever module 600 of this embodiment, similarly to the transverse cantilever module 200, is slidably installed in the longitudinal direction of the pair of second sub-frames 610 and the intermediate support 630. A second extension member 670 may be further included, and a detachable panel provided in a plurality of divisions along the longitudinal direction of the second extension member 670 may be installed on the upper portion of the second extension member 670 .

Another longitudinal cantilever module disposed adjacent to any one of the plurality of longitudinal cantilever modules 600 with respect to the plane shown in FIG. 14 , the scaffold structure for insulation work of an LNG cargo hold according to an embodiment of the present invention It may further include a plurality of longitudinal infill adjustment units 710 connecting the 600 .

The longitudinal infill adjustment unit 710 has a bar shape, and the pair of second sub-frames 610 face each other in the opposite direction, similarly to the horizontal infill adjustment unit 510 . It may include a plurality of longitudinal spacing adjustment members (unsigned) coupled to each of the frame (610).

The longitudinal infill adjustment unit 710 of this embodiment, similarly to the transverse infill adjustment unit 510, is a removable handrail (not shown) that is installed so as to be able to be installed and separated on the longitudinal spacing adjusting member provided as a single unit. may include more.

In addition, a detachable panel TP may be installed between the longitudinal infill adjustment unit 710 and the inner wall surface of the cargo hold 10 .

Since the longitudinal infill adjustment unit 710 has the same configuration and function as the horizontal infill adjustment unit 510 except for its installation position, a detailed description thereof will be omitted.

As shown in FIG. 18 , the scaffold structure for an LNG cargo hold insulation work according to an embodiment of the present invention connects between the transverse cantilever module 200 and the longitudinal cantilever module 600 to form the edge of the cargo hold 10 . It may further include a corner connector 730 disposed adjacent to the unit.

The corner connecting portion 730 of the present embodiment may be formed of a plurality of segment members 731 , 732 , 733 , 734 , and 735 provided as a single unit.

Referring to FIG. 18 , the area in which the corner connection part 730 is disposed is difficult to access by the dismantling means and difficult to modularize due to spatial characteristics. , 733, 734, 735) will be installed or dismantled, respectively.

Each of the plurality of segment members 731, 732, 733, 734, and 735, as shown in FIGS. 18 to 19, is provided with a steel pipe in the form of a square pipe and may have various shapes such as straight, L-shaped, F-shaped, etc. , a footrest plate (unsigned) may be installed on the upper surface of the plurality of segment members 731 , 732 , 733 , 734 , and 735 .

Here, a separate plate (unsigned) may be bolted or welded to each end or both sides of each of the plurality of segment members 731, 732, 733, 734, and 735, and segment members 731 disposed adjacent to each other 732 , 733 , 734 , and 735 ) or the transverse cantilever module 200 or the longitudinal cantilever module 600 may be bolted to the flanges (see FIG. 19 ).

On the other hand, the scaffold structure installed in the corner region of the cargo hold 10 is structurally prone to torsion or bending, and the cantilever-shaped transverse cantilever module 200 and the longitudinal cantilever module 600 and the transverse direction Free ends of the plurality of segment members 830 connecting between the cantilever module 200 and the longitudinal cantilever module 600 may be most vulnerable to deflection.

In the scaffold structure for insulation work of an LNG cargo hold according to an embodiment of the present invention, a plurality of segment members 731 , 732 , 733 , 734 , 735 or a transverse cantilever module 200 to prevent sagging of the corner connection part 730 . It may further include an anti-sag post 740 coupled to one side of the.

The anti-sag post 740 may have the same outer diameter and shape as the post 310, and at a portion where the anti-sag post 740 is coupled, the vertical member 111 of the main frame 110 and the socket unit 115. Similar to the configuration of , a post connection part (not marked) may be additionally formed so that one end of the anti-sag post 740 can be inserted and installed.

In addition, the scaffold structure for insulation work of an LNG cargo hold according to an embodiment of the present invention includes a standard module 100 and a transverse cantilever module 200 to prevent bending and torsional deformation of the scaffold structure at the corner of the cargo hold 10 . ) may further include one or more reinforcing truss parts 750 coupled to it.

The reinforcing truss part 750 is spaced apart from the lower side of the connection frame 130 and the first support member 230 of the standard module 100 and extends long in the horizontal direction as shown in FIGS. 18 to 19 . The horizontal reinforcement 751 may include a plurality of diagonal reinforcements 753 connecting the horizontal reinforcement 751 and the connection frame 130 or the horizontal reinforcement 751 and the first support member 230 .

As an example, as shown in FIG. 19 , two reinforcing truss parts 750 may be installed in the standard module 100 in the corner region of the cargo hold 10 , and one A reinforcing truss unit 750 may be installed.

The horizontal reinforcing material 751 and the plurality of diagonal reinforcing materials 753 may be provided as a steel pipe in the form of a square pipe having the same cross-sectional area as the second horizontal member 113 or the second lower chord member 613, and the horizontal reinforcing material ( 751) and the plurality of diagonal reinforcing materials 753 are integrated with the first support member 230 of the connection frame 130 of the standard module 100 or the transverse cantilever module 200 through a bolt fastening method or a welding method, etc. can be connected

The scaffold structure according to an embodiment of the present invention may further include a corner arm unit 770 installed from the corner connection unit 730 toward the inner wall surface of the cargo hold 10, and the corner arm unit 770 includes a plurality of pieces. It may be preferable to be provided and installed to extend in the transverse and longitudinal directions from the corner connecting portion 730 .

In this embodiment, each of the plurality of corner arm portions 770 may have a variable length extending from the corner connecting portion 730, similarly to the first extension member 250 and the second extension member 670, An appropriate number of detachable panels may be installed on the upper portion of the corner arm 770 during the installation of the insulation box at the corner of the inner space of the cargo hold 10 .

In the scaffold structure for insulation work of an LNG cargo hold according to an embodiment of the present invention, an anti-sag post 740 and a reinforcing truss unit 750 are additionally installed at the corners of the scaffold structure, which is structurally prone to torsion or bending. It can have the effect of preventing the deformation of the structure or the deflection of the free end.

20 is a perspective view showing that the corner portion of the scaffold structure installed in the corner region of the cargo hold interior space forms a plurality of layers based on the plane shown in FIG. 16, and FIG. 21 is a corner load distribution on the scaffold structure shown in FIG. It is a view showing that an additional part is installed, and FIGS. 22 to 23 are a plan view and a rear perspective view respectively for explaining the installation structure of the corner brace part and the diagonal truss part shown in FIG. 21 .

Referring to FIG. 20 , the scaffold structure according to an embodiment of the present invention includes a main structure MS disposed adjacent to an inner wall surface of the cargo hold 10 to form a plurality of layers, and a lower portion of the main structure MS. A supporting structure 370 for supporting the main structure MS may be included.

The main structure (MS) is, as described above, a plurality of standard modules 100 installed at a distance from the inner wall of the cargo hold 10, and a port or starboard side of the cargo hold 10 among the plurality of standard modules 100 A plurality of transverse cantilever modules 200 installed to face the inner wall (left and right side) of the cargo hold 10 from the standard module 100 disposed adjacent to the wall, and the cargo hold 10 among the plurality of standard modules 100 It may include a plurality of longitudinal cantilever modules 600 installed to face the bow or stern side wall inside the cargo hold 10 from the standard module 100 disposed adjacent to the inner bow or stern side wall.

In addition, the scaffold structure according to an embodiment of the present invention includes a corner connection part 730 connecting between the transverse cantilever module 200 and the longitudinal cantilever module 600 in the inner corner region of the cargo hold 10 , and a corner connection part (730) or a sag prevention post 740 coupled to one side of the transverse cantilever module 200, and one or more reinforcing truss parts 750 coupled to the standard module 100 and the transverse cantilever module 200 may include more.

In this embodiment, a plurality of posts 310 are coupled to the upper or lower portions of each of the plurality of standard modules 100 to form a plurality of layers, and among a plurality of standard modules 100 forming a plurality of layers A plurality of standard modules 100 and a plurality of cantilever modules 200, further comprising a diagonal brace 330 connecting one and the other standard module 100 connected to the upper or lower part in an oblique direction. ), it is possible to minimize distortion and deformation of the entire main structure MS.

Referring to FIG. 20 , the main structure MS of this embodiment is shown to form nine layers F1 to F9 in the vertical direction inside the cargo hold 10, but the present invention is not limited thereto, and the cargo hold ( 10) It may be natural to apply a different number of layers of the main structure MS according to the size and the like.

As described above, the scaffold structure according to an embodiment of the present invention includes an anti-sag post 740 and a reinforcing truss unit 750 that are additionally installed in the corner of the scaffold structure that is structurally prone to torsion or bending. Thus, it is possible to have the effect of preventing the sagging of the corner portion.

However, as the structural reinforcement to prevent sagging of the corner of the scaffold structure installed in the corner region of the interior space of the cargo hold 10 is increased, the load applied to the support unit 751 supporting the main structure MS from the lower portion increases. In particular, a phenomenon in which the load is concentrated on the support unit 371 positioned at the corresponding corner among the plurality of support units 371 may occur.

That is, if the anti-sag post 740 and the reinforcing truss part 750 are additionally installed in the corner of the scaffold structure, the load of the scaffold structure may be concentrated on the support unit 371 located in the corresponding corner, and the support There is a risk that the heat insulating layer 20 in contact with the leg base of the unit 371 may be damaged.

In general, the allowable pressure of the insulation layer 20 installed inside the cargo hold 10 is about 5 bar or less (No 96 type), and in the case of Mark Ⅲ type, it is limited to 3.5 bar or less, so the corner design of the scaffold structure is required in consideration of this. .

As shown in FIG. 21 , the scaffold structure for the LNG cargo hold insulation work according to an embodiment of the present invention includes a support unit 371 positioned relatively close to the inner edge of the cargo hold 10 among a plurality of support units 371 ( In order to distribute the load concentrated on the arrow position of FIG. 21 ), it may further include a corner load distribution unit 810 installed from the edge of the main structure MS toward the inner center of the cargo hold 10 .

The corner load distribution unit 810 is installed to be inclined downwardly from the edge of the main structure (MS) adjacent to the edge of the inner space of the cargo hold 10 to the inside center of the cargo hold 10 to connect the upper and lower corners of each floor. A portion 811 may be included.

The corner brace portion 811 is, specifically, a first brace member 811a connecting the lower edge of the main structure MS and the lower end of the anti-sag post 740, and the upper end and lower side of the anti-sag post 740 . It may include a second brace member (811b) for connecting one side of the standard module (100) located in the.

In this embodiment, the first brace member 811a and the second brace member 811b are, when viewed in the plan view shown in FIG. 22 , in a diagonal direction, that is, from the anti-sag post 740, the cargo hold 10 inner edge and They may be installed to face each other in the center.

In addition, when viewed from a plan view, the second brace member 811b may be positioned on the longitudinal extension line of the first brace member 811a, but the second brace member 811b of this embodiment is the main structure MS. Depending on the size of the constituting member, it may be positioned to be shifted from the extension line.

The second brace member 811b of this embodiment has one end coupled to the anti-sag post 740 and the other end is one side of the standard module 100 located below it, more specifically, the transverse cantilever module 200 is installed. It may be coupled to a vertical member 111 located relatively close to the inner center of the cargo hold 10 among the plurality of vertical members 111 to be formed.

The corner load distribution unit 810 of this embodiment may be formed for each layer of the main structure MS forming a plurality of layers, but it may be preferable not to be installed in the upper region of the cargo hold 10 having a chamfer structure. .

In addition, both sides of the cross section of the floor block 11 constituting the bottom of the cargo hold 10 may have a chamfer structure similar to that of the upper area of the cargo hold 10 (see FIG. 1 ), and the main structure MS disposed in the corresponding area has Installation of the corner brace part 811 may be difficult due to space constraints.

In this embodiment, the corner load distribution unit 810 may further include an oblique truss unit 813 installed diagonally from the bottom of the main structure MS disposed in the area to which the cargo hold 10 lower chamfer structure is applied. can

The oblique truss part 813 may have a truss structure on the bottom surface of the main structure MS, and specifically, it is spaced apart from the bottom surface of the main structure MS and extends diagonally long to face the inner edge of the cargo hold 10 . It may include a diagonal member 813a and a plurality of diagonal connecting members 813b connecting the diagonal member 813a and the bottom surface of the main structure MS.

Hereinafter, in describing the main structure of the present embodiment, the formation of nine layers (refer to F1 to F9 in FIG. 21 ) in the vertical direction inside the cargo hold 10 will be described as an example.

Referring to FIG. 21 , the main structure MS may form nine layers F1 to F9 in the vertical direction inside the cargo hold 10 , and the second floor F2 to the sixth floor of the main structure MS ( Between F6), a corner brace portion 811 that connects the upper and lower portions of each floor diagonally is installed, and an oblique truss is installed on the bottom of each of the first and second floors F1 and F2 of the main structure MS, which is limited in space. A portion 813 may be installed.

That is, the corner load distribution unit 810 of this embodiment is the main structure (MS) adjacent to the edge of the interior space of the cargo hold 10 between the second floor (F2) to the sixth floor (F6) of the main structure (MS). Corner brace portion 811 installed to be inclined downwardly from the edge to the center of the cargo hold 10, and oblique truss portion ( 813) may be included.

The corner brace portion 811 is a first brace member 811a connecting the bottom edge of the main structure MS and the lower end of the anti-sag post 740, and the upper end and the lower portion of the anti-sag post 740. A second brace member 811b connecting one side of the standard module 100 may be included.

In this embodiment, the first floor F1 and the second floor F2 of the main structure MS are limited in space due to the chamfer structure formed on both sides of the cross section of the floor block 11, and the corner brace portion 811 In the case of installing the cargo hold 10, it may interfere with the installation process of the heat insulation layer 20 on the inner bottom surface.

As shown in FIG. 23, the diagonal truss part 813 is spaced apart from the bottom of the main structure MS and extends diagonally to the inner edge of the cargo hold 10. A diagonal member 813a and a diagonal member A plurality of diagonal connecting members 813b connecting the bottom surface of the 813a and the main structure MS may be included.

In this embodiment, the oblique truss part 813 is one side of the standard module 100, more specifically, in the center of the cargo hold 10 among the plurality of vertical members 111 to which the transverse cantilever module 200 is coupled. It may be installed in a diagonal direction from the nearest vertical member 111 and connected to the anti-sag post 740 (or post connection part), and installed extending toward the inner corner of the cargo hold 10 to be connected to the corner connection part 730 can

Here, the diagonal member 813a is positioned lower than the horizontal reinforcement 751 of the reinforcement truss part 750 in order to avoid interference with the reinforcement truss part 750 installed in the longitudinal direction from the bottom surface of the main structure MS. It may be desirable to be installed in

24 is a view for comparing the distribution of the reaction force of the support unit due to the corner load distribution unit in the scaffold structure according to an embodiment of the present invention, and (a) of FIG. 24 shows the distribution of the reaction force of the support unit shown in FIG. 20 FIG. 24 (b) is a diagram illustrating a reaction force distribution of the support unit shown in FIG. 21 .

Referring to FIG. 24 , by installing the corner load distribution unit 810 at the edge of the main structure MS adjacent to the corner region of the interior space of the cargo hold 10 , the inside of the cargo hold 10 among the plurality of support units 371 . It can be seen that the load applied to the support unit 371 positioned in the corner region is distributed.

In particular, it can be seen that the load acting on the leg base of the support unit 371 positioned relatively close to the inner edge of the cargo hold 10 is reduced by approximately 30%, thereby reducing the concentration of the load.

25 is a view for comparing the amount of corner deflection according to the presence or absence of corner braces in the scaffold structure according to an embodiment of the present invention. 25 (b) is a view showing the amount of corner deflection of the main structure in which the corner brace unit is installed in the scaffold structure shown in FIG.

The scaffold structure according to an embodiment of the present invention, as shown in FIG. 25 , a corner brace connecting the upper and lower portions of each floor at the edge of the main structure MS adjacent to the corner of the internal space of the cargo hold 10 . As the part 811 is installed, it can be seen that the amount of corner deflection is reduced by about 80% from 1.8 cm to 0.3 cm.

In particular, it can have the effect of satisfying the allowable deflection required by the structure design criteria according to the international standard ISO.

)는 171.5cm이며, 해당 부위에서 허용 처짐량(

)은 하기의 [수학식 1]과 같을 수 있다.To explain in detail, in the ISO design standard, the value obtained by dividing the length of the structure by 125 becomes the allowable deflection value. The length of the cantilever module in the scaffold structure shown in FIG. Length to the corner joint 730 (

) is 171.5 cm, and the allowable amount of deflection (

) may be as in [Equation 1] below.

)은 1.8cm(도 25의 (a) 참조)로서, 허용 처짐량(1.37cm)보다 큰 값을 가지는데, 코너 브레이스부(811)의 설치 시 해당 부위 처짐량이 0.3cm(도 25의 (b) 참조)로 감소하여 허용 처짐량보다 작은 값을 가짐을 알 수 있다.Here, the amount of deflection (absolute amount of deflection,

) is 1.8 cm (refer to (a) of FIG. 25), which has a value greater than the allowable amount of deflection (1.37 cm), and the amount of deflection of the corresponding area when the corner brace part 811 is installed is 0.3 cm (see (b) of FIG. 25). ), and it can be seen that it has a smaller value than the allowable deflection amount.

The scaffold structure for the LNG cargo hold insulation work according to an embodiment of the present invention further includes a corner load distribution unit 810 installed from the edge of the main structure MS toward the inner center of the cargo hold 10, the cargo hold 10 ) not only can alleviate the phenomenon of concentration of the load on the support unit 371 positioned relatively close to the inner edge, but also significantly reduce the amount of deflection of the corner of the scaffold structure disposed adjacent to the corner area of the cargo hold 10 inner space. It may have the effect of reducing

In addition, by distributing the load applied to the support unit 370 to minimize the damage of the insulation layer installed on the inner bottom surface of the cargo hold, and by satisfying the allowable pressure condition of the insulation layer, it may be applicable to various insulation system installation work.

Hereinafter, to briefly describe the operation method of the scaffold structure for the LNG cargo hold insulation work according to an embodiment of the present invention, the step of installing the main structure (MS) forming a plurality of layers at a position adjacent to the inner wall surface of the cargo hold 10 And, it may include the step of installing a supporting structure 370 for supporting the main structure (MS) before the step of installing the main structure (MS).

In the step of installing the main structure (MS), the step of installing a plurality of standard modules 100 at a distance from the inner wall of the cargo hold 10, and the port or inside the cargo hold 10 among the plurality of standard modules 100 Installing a plurality of transverse cantilever modules 200 from the standard module 100 disposed adjacent to the starboard side wall to the inside wall of the cargo hold 10, and the cargo hold 10 among the plurality of standard modules 100 It may include installing a plurality of longitudinal cantilever modules 600 to face the bow or stern side wall inside the cargo hold 10 from the standard module 100 disposed adjacent to the bow or stern side wall of the interior. .

In addition, in the step of installing the main structure MS, a plurality of posts 310 are coupled to the upper or lower portions of each of the plurality of standard modules 100 to form a plurality of layers, and to form a plurality of layers By additionally installing a diagonal brace 330 connecting any one of the plurality of standard modules 100 and the other standard module 100 connected to the upper or lower portion in an oblique direction, a plurality of standard modules 100 ) and the entire main structure MS including the plurality of cantilever modules 200 can minimize distortion and deformation.

In the present embodiment, the supporting structure 370 may include a plurality of support units 371 that are in surface contact with the inner bottom surface of the cargo hold 10 or the heat insulation layer 20 installed on the inner bottom surface of the cargo hold 10 .

In the method of operating a scaffold structure according to an embodiment of the present invention, a corner load distribution for distributing the load concentrated on the support unit 371 positioned relatively close to the inner edge of the cargo hold 10 among the plurality of support units 371 It may further include the step of installing the unit.

In the scaffold structure for insulation work of an LNG cargo hold according to an embodiment of the present invention, a part of the scaffold structure installed inside the cargo hold is enlarged in a module form for the construction work of the insulation layer of the LNG cargo hold, so that an operator during installation or dismantling of the scaffold structure It can have the effect of reducing the number of working hours and shortening the work schedule for installing the insulation layer inside the cargo hold.

In addition, each of the plurality of standard modules and the plurality of cantilever modules is provided to have a truss structure, which not only makes assembly and installation easier through weight reduction, but also improves the structural stability of the scaffold structure against vertical bending or torsional deformation. can

In addition, by additionally installing the anti-sag post and the reinforcing truss in the corner region of the cargo hold, which is structurally prone to torsion or bending, it can have the effect of preventing deformation of the scaffold structure or sagging of the free end.

Furthermore, through the corner load distributing part, it is possible not only to alleviate the phenomenon of load concentration on the support unit located relatively close to the inside edge of the cargo hold, but also to reduce the amount of deflection of the corner of the scaffold structure disposed adjacent to the edge of the cargo hold interior space. It may have the effect of significantly reducing it.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes and substitutions are possible within the scope that does not depart from the essential characteristics of the present invention by those of ordinary skill in the art to which the present invention pertains. will be.

Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are for explaining, not limiting, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings. .

In addition, the protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

100: Standard module
110: main frame
111: vertical member
112: first horizontal member
113: second horizontal member
114: inclined member
115: socket part
117: transverse flange portion
130: connection frame
150: connecting member
170: Foldable handrail
171: handrail post
173: handrail
175: toe board (Toe board)
177: insert
179: shim pin
200: (transverse) cantilever module (Transverse cantilever module)
210: first sub-frame
211: first upper side member
213: first lower string member
215: first brace member
230: first support member
250: extension member (Inner Arm)
310: Post (Post)
311: female socket part
330: diagonal brace (Diagonal brace)
350: platform structure
351: Upper bridge deck
353: Lower bridge deck
370: supporting structure
371: support unit
390: lateral distance control unit
391: distance adjustment member
400: transport means
410: module transfer unit
413: Monorail (Runway beam)
415: Trolley hoist
417: foot step
419: inspection handrail (handrail)
430: mast part
431: base mast member
433: connecting mast member
435: Ladder
450: connection brace unit
451: brace body
453: first end flange
455: second end flange
470: elevating means
471: wire (wire)
473: lifting hoist
490: anti-rotation means
491: adhesion member
510: transverse infill (Infill) adjustment unit
511: transverse spacing adjustment member
513: Removal type handrail
530: module landing unit
550: stair structure
570: elevator unit
600: longitudinal cantilever module (Longitudinal cantilever module)
610: second sub-frame
611: second upper string member
613: second lower string member
615: second brace member
630: middle support
650: second support member
670: second extension member
710: longitudinal infill adjustment unit
730: corner connection
731, 732, 733, 734, 735: segment member
740: anti-sag post
750: reinforcing truss part
751: horizontal stiffener
753: diagonal reinforcement
770: corner arm unit
810: corner load distribution unit
811: corner brace part
813: oblique truss part
10: cargo hold
20: insulation layer
MS: main structure
Td: trunk deck
Gd: Gas dome
Mc: mobile cart
P1, P2, P3: foot plate
TP: Telescopic panel

Claims (14)

As a scaffolding structure for the construction work of the insulation layer inside the cargo hold,
a main structure disposed adjacent to the inner wall of the cargo hold to form a plurality of layers; and
A supporting structure for supporting the main structure under the main structure,
The supporting structure includes a plurality of support units that are in surface contact with the inner bottom surface of the cargo hold or the heat insulation layer installed on the inner bottom surface of the cargo hold,
Scaffolding structure further comprising a corner load distribution unit for distributing a load concentrated on a support unit located relatively close to the inner edge of the cargo hold among the plurality of support units. The method of claim 1,
The corner load distribution unit,
a corner brace that is installed to be inclined downwardly from a portion of the main structure adjacent to a corner of the cargo hold internal space toward the center of the cargo hold to connect the upper part and the lower part of each floor; and
Scaffolding structure including a diagonal truss part installed on the bottom surface of the main structure disposed in the area to which the lower chamfer structure of the cargo hold is applied. 3. The method of claim 2,
The main structure is
a plurality of standard modules installed at a distance from the inner wall of the cargo hold and in which a plurality of posts are coupled to the upper or lower portions;
a plurality of transverse cantilever modules installed to face an inner wall of the cargo hold from a standard module disposed adjacent to a port or starboard wall inside the cargo hold among the plurality of standard modules; and
A scaffold structure comprising a plurality of longitudinal cantilever modules installed to face the bow or stern side wall inside the cargo hold from the standard module disposed adjacent to the bow or stern side wall inside the cargo hold among the plurality of standard modules. 4. The method of claim 3,
a corner connector connecting the transverse cantilever module and the longitudinal cantilever module in the inner corner region of the cargo hold;
an anti-sag post coupled to one side of the corner connection part or the transverse cantilever module; and
The scaffold structure further comprising one or more reinforcing trusses coupled to the standard module and the transverse cantilever module. 5. The method of claim 4,
The corner brace portion,
a first brace member connecting the lower edge of the main structure and the lower end of the anti-sag post; and
Scaffolding structure comprising a second brace member for connecting one side of the standard module located below the upper end of the sag prevention post. 6. The method of claim 5,
The second brace member,
One end is coupled to the upper end of the anti-sag post and the other end is coupled to a vertical member positioned relatively close to the center of the cargo hold among a plurality of vertical members on which the transverse cantilever module is installed. 5. The method of claim 4,
The diagonal truss part,
a diagonal member spaced apart from the bottom surface of the main structure and extending long to face the inner edge of the cargo hold; and
A scaffold structure comprising a plurality of diagonal connecting members connecting the diagonal member and a bottom surface of the main structure. 8. The method of claim 7,
The diagonal member is
A scaffold structure for connecting a vertical member positioned relatively close to the center of the cargo hold among a plurality of vertical members on which the transverse cantilever module is installed and the anti-sagging post positioned in a diagonal direction. 9. The method of claim 8,
The diagonal member is
The scaffold structure is installed extending from the anti-sag post toward the inner edge of the cargo hold, and is connected to the corner connection part through the diagonal connection member. 8. The method of claim 7,
The reinforcing truss portion includes a horizontal reinforcing material extending horizontally in the longitudinal direction from the lower portion of the standard module or the transverse cantilever module,
The diagonal member is a scaffold structure installed at a lower position than the horizontal reinforcement. 4. The method of claim 3,
Scaffolding structure further comprising a diagonal brace connecting any one of the plurality of standard modules and the other standard module connected to the upper or lower part in an oblique direction. The method of claim 1,
The main structure forms nine layers in the vertical direction inside the cargo hold,
The corner load distribution unit,
an oblique truss portion having a truss structure and diagonally installed on the bottom surface of each of the first and second floors of the main structure to face the center of the cargo hold; and
A scaffold structure including a corner brace that is installed to be inclined downwardly in a diagonal direction toward the center of the inside of the cargo hold between the 2nd to 6th floors of the main structure and connects the upper and lower parts of each floor. As a method of operating a scaffold structure for the construction work of the insulation layer inside the cargo hold,
installing a main structure forming a plurality of layers at a position adjacent to the inner wall of the cargo hold; and
Including the step of installing a supporting structure for supporting the main structure before the step of installing the main structure,
The supporting structure includes a plurality of support units that are in surface contact with the inner bottom surface of the cargo hold or the heat insulation layer installed on the inner bottom surface of the cargo hold,
The method of operating a scaffold structure further comprising the step of installing a corner load distribution unit for distributing a load concentrated on a support unit located relatively close to the inner corner of the cargo hold among the plurality of support units. 14. The method of claim 13,
In the step of installing the main structure,
installing a plurality of standard modules at a distance from the inner wall of the cargo hold;
installing a plurality of transverse cantilever modules from a standard module disposed adjacent to a port or starboard side wall inside the cargo hold toward an inner wall of the cargo hold among the plurality of standard modules; and
Scaffolding structure comprising the step of installing a plurality of longitudinal cantilever modules from the standard module disposed adjacent to the wall on the bow or stern side of the cargo hold among the plurality of standard modules toward the wall on the bow or stern side inside the cargo hold operation method.

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