KR102177228B1 - Platform installation method for lng storage tank - Google Patents

Abstract

The present invention is to easily lift a work table capable of performing work for maintenance of the lower surface of the suspended deck of the liquefied natural gas storage tank and the upper part of the loading and unloading pipe, so that it can easily reach the lower surface of the suspended deck without using a scaffold. It is possible to reduce materials for scaffolding, and to a method of installing a worktable for a liquefied natural gas storage tank with an improved structure to prevent safety accidents.

Description

Installation method of workbench for liquefied natural gas storage tank {PLATFORM INSTALLATION METHOD FOR LNG STORAGE TANK}

The present invention relates to a method of installing a workbench for a liquefied natural gas storage tank, and in particular, by easily lifting a workbench capable of performing work for maintenance of the lower surface of the suspended deck of the liquefied natural gas storage tank and the upper part of the loading and unloading pipe. Regarding the method of installing a workbench for a liquefied natural gas storage tank with an improved structure so that it can easily reach the lower surface of the suspended deck without using a scaffold, and save materials for scaffolding, and prevent safety accidents. will be.

In general, a scaffold or chief refers to a temporary scaffolding structure that lifts various materials required at construction and shipbuilding sites, or allows workers to work at high places.

Since the provision of the working space using the scaffolding is achieved by gradually stacking many components from the bottom of the hoistway, it takes a lot of unnecessary material and labor consumption to build the scaffold to the adjacent part of the uppermost floor of the hoistway. In this high-rise case, it is becoming too inefficient. In addition, the risk of safety accidents such as a fall is very high because the worker has to work while moving up and down on a scaffold.

As for the prior art related to the existing workbench, as disclosed in Korean Patent Publication No. 10-0551151, "Workbench and Workbench Installation Method with Convenient Configuration" (Registration Date: 2006.02.03), on the wall forming a vertical passageway. In the method of installing a work table having a support and a footrest, one end of which is coupled to one end of the upper surface of the support and the other end of which is extended upward, to a structure having an entrance passage formed to communicate with the vertical passage, a ) Positioning the footboard toward the vertical passage in the entrance passage adjacent to the vertical passage, b) fixing the support to the bottom of the entry passage so as to be rotatable at an adjacent portion of one end of the support, c) coupling a horizontal support having a length greater than the width of the access passage to the other end of the support, d) attaching the other end of the support to one end of the support until the horizontal support contacts the wall. Rotating about the center, e) fixing the horizontal support to the wall, and f) fixing the other end of the footboard to the wall opposite to the entrance passage.

[ A worktable manufacturing step of manufacturing a worktable to have an upper scaffolding member installed on the upper part of the frame with an opened moving part, a ladder connecting the moving part of the lower part of the frame and the upper scaffolding member, and a connecting ring provided on the upper part of the frame Wow; A worktable installation step of connecting a crane wire to the connection ring of the worktable, arranging the worktable adjacent to the ship by using a crane, and then installing the worktable detachably on the ship through a separate fastening member; Another workbench is connected to the connecting ring of another workbench, and the other workbench is placed on the side of the workbench installed in the workbench installation step using a crane, and the another workbench can be attached and detached from the ship through a separate fastening member. After installation, a connecting scaffolding member is installed between the upper scaffolding members of the workbench, or a crane wire is connected to the connecting ring of another workbench, and the other worktable is placed above the worktable installed in the workbench installation step using a crane. And a further installation step of attaching and detaching the other worktable to the ship and the worktable installed in the worktable installation step via a separate fastening member.

Existing LNG storage tanks are divided into membrane type and independent tank type depending on whether the load of cargo directly acts on the insulation.

As a prior art related to the existing LNG storage tank, as disclosed in Korean Patent Publication No. 10-796815, "Installation Method of LNG Tank Insulation System" (Registration Date: January 15, 2008), the tank is located at a predetermined location on the inner wall of the tank. An installation step of movably installing a support structure along the longitudinal direction, a moving step of moving materials or workers along the support structure, and a material installation step of installing the material moved in the moving step on the inner wall of the large structure Includes.

However, in the case of the existing liquefied natural gas storage tank, the inner tank is arranged inside the outer tank, the suspended deck is arranged above the inner tank, and the loading and unloading pipes are arranged in the vertical direction inside the suspended deck. The pipes are made of aluminum and are arranged to be suspended from the steel beams provided on the roof of the outer tank by four support pipes.

Existing unloading pipes move up and down when unloading LNG as time passes, and there is a risk of bending left and right, and severely deformed up and down, and the lugs connecting the support pipe and the steel beam will be damaged and deformed. There is concern.

Accordingly, during the above-described maintenance work of the cargo piping or the maintenance work of the suspended deck, maintenance work is possible only by installing a workbench made of steel pipe scaffolding approximately 31m in height from the bottom of the inner tank to the top.In this case, materials and materials for scaffolding installation and Not only does it take a long time to install the scaffold because it takes a lot of parts, it is difficult to access until the operator climbs the steps of the scaffold and reaches the scaffolding, and there is a risk of falling. There was a danger.

Korean Registered Patent Publication No. 10-0551151 "Workbench and Workbench Installation Method with Convenient Configuration" (Registration Date: 2006.02.03) Korean Registered Patent Publication No. 10-1859114 "How to install a worktable for ships capable of multi-stage stacking"

The present invention was created to solve these problems in consideration of the above problems, and its purpose is to easily reach the lower surface of the suspended deck without using a scaffold, and to reduce materials for scaffolding, and to prevent safety accidents. It is to provide a method of installing a workbench for a liquefied natural gas storage tank whose structure has been improved to prevent the problem.

The present invention for achieving the above object is a lug installation step of installing a lifting lug on a steel beam provided on the outer shell roof of a storage tank for liquefied natural gas; A worktable manufacturing step of producing a worktable at the bottom of the inner tank of the liquefied natural gas storage tank; A drilling step of drilling a through hole through the suspended deck disposed on the upper portion of the inner tank so that the through pipe provided on the work table penetrates, and forming an entry and exit hole into the work bench in the suspended deck; A rope connecting step of connecting an end of a wire rope to the worktable and connecting the wire winch and the worktable to the wire rope through the lifting lug; A lifting step of lifting the worktable upward with a wire rope and a wire winch; A fixing step of fixing the through pipe of the worktable passing through the through hole in the lifting step to the roof of the outer tank; And a finishing step of installing a ladder and a fall prevention safety net for entering and leaving the work table through the entrance/exit hole.

The worktable is constructed along the outer periphery of the loading and unloading pipe, and has a structure in which a hollow is formed in the center to accommodate the unloading pipe arranged in a vertical direction in the inner tank.

The lifting lug is integrally coupled to the steel beam by welding.

In the fixing step, the upper end of the connection pipe is detachably coupled to the steel beam using a first clamp, and the lower end of the connection pipe is detachably attached to the through pipe of the worktable through the through hole with a second clamp. To connect.

The present invention does not stack the workbench for maintenance work on the lower surface of the suspended deck of the liquefied natural gas storage tank and the upper part of the loading and unloading pipe from the bottom of the inner tank, but lifted by using a wire rope and a wire winch to the ceiling of the outer tank. It is possible to enter the worktable side through the entry and exit holes drilled in the suspended deck after being fixed to the steel beam provided in the ceiling while being lifted by the system, so it is not only possible to install the worktable while saving materials, but also the existing scaffolding type worktable It has the advantage of preventing safety accidents such as falls of workers while climbing.

In addition, the present invention uses a second clamp on the connecting pipe fixed to the steel beam in a state in which the through pipe provided on the worktable passes through the through hole drilled in the suspended deck and protrudes upward from the suspended deck during the lifting operation of the wire rope. Since it can be connected in a sturdy and disassembled manner, not only can the worktable be securely fixed, but also have the advantage of being able to recycle the worktable by moving it to another worksite after the work is completed.

1 is a flowchart sequentially showing a method of installing a worktable for a liquefied natural gas storage tank according to the present invention.
Figure 2 is a state diagram showing a state in which the workbench is lifted to the present invention liquefied natural gas storage tank.
3 is a schematic configuration diagram of the present invention suspended deck and worktable.
Figure 4 is a photograph showing a state in which a lifting lug and a wire rope are connected to the steel beam of the present invention.
5 is a photograph showing a state in which the present invention worktable is manufactured on the bottom of the inner tank.

The present invention does not stack a worktable capable of performing work for maintaining the lower surface of the suspended deck of the liquefied natural gas storage tank and the upper part of the loading and unloading pipe from the bottom of the inner tank, but lifting it to the ceiling of the outer tank and provided on the ceiling. It is fixed to the steel beam so that the workbench can be easily installed while saving material.

Hereinafter, a method of installing a working table for a liquefied natural gas storage tank according to the present invention will be described in more detail through a detailed description of embodiments with reference to the drawings.

In describing the present invention, if it is determined that a detailed description of a related known technology or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention and may vary according to user intentions or customs. Therefore, the definition should be made based on the contents throughout this specification. In addition, "including" a certain component means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

A method of installing a working table for a liquefied natural gas storage tank according to the present invention will be described with reference to FIGS. 1 to 5, and a lifting lug on the steel beam 15 provided on the roof of the outer tank 12 of the storage tank 10 for liquefied natural gas A lug installation step (S1) to install 50; A working table manufacturing step (S2) of manufacturing a working table 100 from the bottom of the inner tank 14 of the liquefied natural gas storage tank 10; A through hole 22 is drilled through the suspended deck 20 disposed on the inner tank 14 so that the through pipe 110 provided in the work table 100 penetrates, and the suspended deck 20 A perforation step (S3) of perforating the entry and exit holes 25 into the work table 100; Rope connection step of connecting the end of the wire rope 200 to the work table 100 and connecting the wire winch 250 and the work table 100 to the wire rope 200 through the lifting lug 50 (S4) )Wow; A lifting step (S5) of lifting the worktable 100 upward with a wire rope 200 and a wire winch 250; A fixing step (S6) of fixing the through pipe 110 of the worktable 100 that passed through the through hole 22 in the lifting step (S5) to the roof of the outer tank 12; And a finishing step (S7) of installing a ladder and a fall prevention safety net that can be accessed to the work table 100 through the entrance/exit hole 25.

In the lug installation step (S1), the lifting lug 50 is integrally coupled to the lower side of the steel beam 15 by welding.

The worktable manufacturing step (S2) is configured along the outer periphery of the loading and unloading pipes 30 from the bottom of the inner tank 14, and a hollow to accommodate the loading and unloading pipes 30 arranged vertically in the inner tank 14 at the center. It is manufactured in a formed structure.

In addition, the worktable 100 is formed in a square shape having a hollow and a footrest, and is provided with a through pipe 110 passing through the through hole 22 at the upper side of each of the four corners during the lifting operation.

In response to this, four through holes 22 are formed in the suspended deck 20 so that the through pipe 110 passes during the lifting operation of the work table 100.

In addition, the suspended deck 20 is provided on the upper side of the inner tank 14, and the entry and exit holes 25 are perforated so that the operator can enter and exit the worktable 100 through a ladder.

In the rope connection step (S4), a wire rope is connected to bind one end of the wire rope 200 to the work table 100 and wound around the wire winch 250 through the through hole 22 and the lifting lug 50. Connect 200.

Accordingly, by winding the wire rope 200 according to the operation of the wire winch 250, the worktable 100 can be lifted upward, and the worktable 100 is mounted on the lower surface of the suspended deck 20 and the unloading pipe 30 When the upper portion of the unit is lifted to a height capable of maintenance, the through pipe 110 passes through the through hole 22 and protrudes above the suspended deck 20.

In the fixing step (S6), the upper end of the connection pipe 310 is detachably coupled to the steel beam 15 using a first clamp 410, and the lower end of the connection pipe 310 is attached to the through hole ( The second clamp 420 is detachably connected to the through pipe 110 of the worktable 100 that has passed through 22).

For this reason, in the fixing step (S6), when the worktable 100 is lifted, the upper part of the through pipe 110 that has passed through the through hole 22 is connected to the steel beam 15 by the first clamp 410 The lower portion of the 310 and the second clamp 420 can be combined to be firmly fixed while the worktable 100 is suspended from the wire rope 200, and if necessary, the connection pipe 310 and the through pipe 110 It is detachably coupled so that it can be separated.

At this time, the connection pipe 310 is detachably coupled to the steel beam 15 by the first clamp 410 at the upper end, and the through pipe 110 and detachably at the lower end through the second clamp 420 Connected.

Subsequently, a ladder is installed in the entry/exit hole 25 of the suspended deck 20, and a fall prevention safety net (not shown) is installed under the work table 100.

After that, the operator can enter the worktable 100 side by passing through the entry/exit hole 25 through the ladder from the upper side of the suspended deck 20, and the lower side of the suspended deck 20 or the loading and unloading pipe ( 30) can perform maintenance or repair work.

After the above operation is completed, the coupling state of the second clamp 420 is released to separate the through pipe 110 from the connection pipe 310, and then the wire winch 250 is driven in the reverse direction to the wire rope 200. It can be recycled after lowering the worktable 100 to the bottom of the inner tank 14 by using and moving it to another work place.

Therefore, the present invention does not stack the work table 100 for maintenance work on the lower surface of the suspended deck 20 of the liquefied natural gas storage tank 10 and the upper part of the loading and unloading pipe 30 from the bottom of the inner tank 14 , The ceiling of the outer tank 12 is lifted using a wire rope 200 and a wire winch 250 and fixed to the steel beam 15 provided on the ceiling while being lifted by the wire rope 200, the suspended deck It is possible to enter the worktable 100 side through the entry and exit holes 25 drilled in (20), so it is not only possible to install the worktable 100 while saving materials, but also while climbing the existing scaffolding type worktable 100 It has the advantage of preventing safety accidents such as falls of workers.

In addition, in the present invention, when the wire rope 200 is lifted, the through pipe 110 provided in the work table 100 passes through the through hole 22 drilled in the suspended deck 20 to the upper side of the suspended deck 20. In the protruding state, since the second clamp 420 can be connected to the connection pipe 310 fixed to the steel beam 15 in a robust and disassembled manner, the worktable 100 can be securely fixed. Rather, it has the advantage of being able to recycle by moving the worktable 100 to another work site after the work is completed.

10: (liquefied natural gas) storage tank 12: external tank
14: inner tank 15: steel beam
20: suspended deck 22: through hole
25: entry and exit 30: loading and unloading piping
50: lifting lug 100: worktable
110: through pipe 200: wire rope
250: wire winch 310: connecting pipe
410: first clamp 420: second clamp

Claims (4)

A lug installation step (S1) of installing a lifting lug 50 on the steel beam 15 provided on the roof of the outer tank 12 of the liquefied natural gas storage tank 10;
A working table manufacturing step (S2) of manufacturing a working table 100 from the bottom of the inner tank 14 of the liquefied natural gas storage tank 10;
A through hole 22 is drilled through the suspended deck 20 disposed on the inner tank 14 so that the through pipe 110 provided in the work table 100 penetrates, and the suspended deck 20 A perforation step (S3) of perforating the entry and exit holes 25 into the work table 100;
A rope connection step of connecting the end of the wire rope 200 to the work table 100 and connecting the wire winch 250 and the work table 100 to the wire rope 200 through the lifting lug 50 (S4) )Wow;
A lifting step (S5) of lifting the worktable 100 upward with a wire rope 200 and a wire winch 250;
A fixing step (S6) of fixing the through pipe 110 of the worktable 100 that passed through the through hole 22 in the lifting step (S5) to the roof of the outer tank 12; And
It is made including a finishing step (S7) of installing a ladder and a fall prevention safety net that can enter the work table 100 through the entry and exit hole 25,
The worktable 100 is configured along the outer circumference of the loading and unloading pipe 30, and has a structure in which a hollow is formed to accommodate the unloading pipe 30 disposed in the vertical direction in the inner tank 14 at the center, and the fixing Step (S6) is to detachably couple the upper end of the connection pipe 310 to the steel beam 15 using a first clamp 410, and the lower end of the connection pipe 310 is the through hole 22 A second clamp 420 is detachably connected to the through pipe 110 of the work table 100 that has passed through, and the upper end of the connection pipe 310 is attached to the steel beam 15 as a first clamp 410. Liquefied natural gas storage tank workbench installation method characterized in that it is detachably coupled and the lower end is detachably connected to the through pipe 110 via the second clamp 420 delete The method according to claim 1,
The lifting lug 50 is a method for installing a worktable for a liquefied natural gas storage tank, characterized in that it is integrally coupled to the steel beam 15 by welding.
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