KR20230034604A - Leg supporting apparatus of scaffold structure and method for supproting scaffold structure using the same - Google Patents

Abstract

The present relates to a leg supporting apparatus of a scaffolding structure forming a plurality of layers inside a storage tank, including a plurality of scaffolding units. According to the present invention, the leg supporting apparatus of a scaffolding structure comprises: a plurality of legs provided under the scaffolding structure; and a load distribution support unit for distributing and supporting the load of the scaffolding structure at a lower part of the leg. The load distribution support unit is horizontally rotatably provided on an inner bottom surface of the storage tank with the leg as a rotation center.

Description

Leg support device of scaffolding structure and method of supporting scaffolding structure using the same

The present invention relates to a scaffolding structure, and more particularly, to provide a part of a scaffolding structure installed inside a storage tank in the form of an enlarged module for constructing an insulation layer or maintenance work of a liquefied gas storage tank, and dismantling such a scaffolding structure. It relates to a leg support device for a scaffolding structure that shortens the work schedule and the number of hours and facilitates avoiding the weld seam or wrinkle area of the membrane sheet in the process of constructing the heat insulating layer, and a method for supporting the scaffolding structure using the same.

Due to recent strengthening of environmental pollution regulation standards for ships, interest in eco-friendly high-efficiency fuels such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG) is increasing.

Liquefied natural gas is obtained by cooling and liquefying methane obtained by refining natural gas collected from gas fields. .

In particular, liquefied natural gas (hereinafter referred to as 'LNG') is obtained by cooling natural gas to an extremely low temperature (about -163 ° C), and its volume is reduced to about 1/600 of that of gaseous natural gas, so it is safe to use the sea. It is very suitable for transport over long distances.

A liquefied gas carrier (LNG carrier) for loading and unloading liquefied gas to a place of demand on land by navigating the sea with LNG, or LNG that regasifies the stored LNG and unloads it in the form of natural gas after navigating the sea and arriving at the place of demand on land. A storage tank is installed in the RV (LNG Regasification Vessel) to store LNG in a cryogenic state.

In addition, LNG FPSO (Floating Production Storage and Offloading), which is used to liquefy and store produced natural gas directly at sea and transfer stored LNG to LNG carriers when necessary, or after storing LNG unloaded from sea to LNG carriers, Storage tanks installed in LNG carriers and LNG RVs are also provided in floating offshore structures such as LNG Floating Storage and Regasification Units (FSRUs), which vaporize LNG as needed and supply it to land consumers.

Such a liquefied gas storage tank can be classified into a membrane type and an independent type depending on whether the insulation for storing LNG in a cryogenic state directly acts on the load of the cargo, and the inside of the structural material of the hull Membrane type storage tanks with barriers resistant to low temperature brittleness and insulating materials interposed between the barriers are widely used.

An insulation layer for external insulation of liquefied gas is provided on the inner wall of the liquefied gas storage tank. As an example, an insulation box containing an insulation material and Inbar steel may be sequentially stacked.

In addition, the liquefied gas storage tank requires maintenance work for repairing the storage tank when inspecting and confirming leakage of liquefied gas through a monitoring system such as a gas detector and a temperature sensor. Such insulation layer construction or maintenance work For this, a separate scaffolding structure (or scaffolding, scaffold) may be installed in the internal space of the liquefied gas storage tank.

The foregoing technical configuration is a background technology for helping understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

Republic of Korea Patent Publication No. 10-2021-0019253 "Membrane cargo hold scaffolding base structure"

At least some of the scaffolding structures described above have a truss structure, thereby improving structural stability against vertical bending or torsional deformation. It is installed by connecting each of the steel pipe members in the form of a circular pipe with bolts or pins.

In order to dismantle these scaffolding structures, each member constituting the scaffolding structure is dismantled, and the scaffolding structure is sequentially dismantled from the top layer one by one using a working elevator (cage size: 3x1m) installed inside the storage tank. Due to the installation and disassembly of each member made of, the number of working hours and schedule are increased, which is not only inefficient, but also increases the incidence of musculoskeletal disorders and various safety accidents of workers due to the scaffolding member having an upper limit weight.

1 is a view schematically showing the arrangement structure of legs installed on the inner bottom surface of a liquefied gas storage tank. Referring to FIG. A plurality of legs 30 are disposed.

As shown in FIG. 1, the legs 30 of the scaffolding structure are first installed to be supported on the bottom surface inside the storage tank (see FIG. 1 (a)), and then some of the plurality of legs 30 are lifted to An insulation panel (or insulation box) 10 is installed at the bottom, and a sealing wall 20 is installed between the legs 30 of the scaffold structure and the insulation panel 10 to prevent leakage of LNG.

That is, each of the plurality of legs 30 is primarily installed on the inner bottom surface of the storage tank to support the scaffolding structure, and after the construction of the insulation layer on the inner bottom surface is completed, the heat insulation formed on the inner bottom surface of the storage tank It may be configured to be secondarily supported on the panel 10 .

Here, the scaffolding structure maintains structural stability while all vertical loads are transmitted to the inner bottom of the hull. There is a risk that the insulation panel 10 installed on the inner bottom surface of the hull may be damaged due to excessive concentrated load. .

In addition, the scaffolding structure according to the prior art has a leg 30 to avoid a welding seam region and/or a corrugation region 22 of the membrane sheet 21 constituting the sealing wall 20 Although moved in the longitudinal direction (see (b) and (c) of FIG. 1), there is a risk of safety accident in the process of moving the leg 30, as well as on the insulation panel 10 or the sealing wall 20 Since it takes a lot of time to adjust so that a uniform load acts on the load, work efficiency and productivity may decrease, so improvement measures are required for this.

The present invention minimizes the operator's manual work and heavy handling during the installation or dismantling of the scaffolding structure installed inside the storage tank for construction or maintenance of the insulation layer of the liquefied gas storage tank, thereby preventing workers' musculoskeletal disorders and preventing various safety accidents. It is an object to provide a scaffolding structure that can be reduced.

In addition, the present invention provides a leg support device for a scaffold structure that stably supports a scaffold structure and easily avoids a welding seam or wrinkle area of a membrane sheet in the process of constructing a heat insulation layer and a method for supporting a scaffold structure using the same for a different purpose

According to one aspect of the present invention, a device for supporting the legs of a scaffolding structure forming a plurality of layers inside a storage tank, including a plurality of scaffolding units, comprising: a plurality of legs provided at a lower portion of the scaffolding structure; And it may be provided with a leg support device of the scaffolding structure including a load distribution support for distributing and supporting the load of the scaffolding structure at the lower part of the leg.

The load distribution support may be horizontally rotatably provided on an inner bottom surface of the storage tank with the leg as a rotational center.

In addition, the load distribution support may further include a rotation connecting portion connecting the leg and the load distribution support so that the load distribution support can horizontally rotate on the inner bottom surface of the storage tank.

In addition, the load distribution support unit may be provided to rotate 180 degrees about the rotation center of the leg.

In addition, the load distribution support unit is initially positioned on an upper portion of an insulating panel installed on the inner bottom surface of the storage tank, and after forming a sealing wall on the insulating panel, the membrane sheet constituting the sealing wall It can be rotated to be positioned on top.

In addition, one or more support blocks installed on the lower surface of the load distribution support unit may be further included.

In addition, the support block may be provided in a single shape on the lower surface of the load distribution support unit, and an accommodation groove for accommodating the wrinkled portion of the membrane sheet may be formed in the support block.

According to another aspect of the present invention, as a method for supporting the scaffolding structure using the leg support device, installing the leg support device so that the scaffold structure is supported on the inner bottom surface of the storage tank; adjusting the height of the leg so that the load distribution support is positioned on the heat insulating layer formed on the inner bottom surface of the storage tank in the process of constructing the heat insulating layer inside the storage tank; And it may be provided with a support method for a scaffolding structure comprising the step of horizontally rotating the load distribution support on the inner bottom surface of the storage tank with the leg as a rotation center.

In the step of horizontally rotating the load distribution support unit, the load distribution support unit may be rotated to be positioned on a membrane sheet formed on the heat insulating layer and constituting a sealing wall.

In addition, in the step of horizontally rotating the load distribution support unit, the leg support device may be installed so as not to interfere with the weld seam portion or wrinkle area of the membrane sheet through one or more support blocks installed on the bottom surface of the load distribution support unit. can

The present invention provides a part of the scaffolding structure installed inside the storage tank in the form of an enlarged module for the construction or maintenance of the insulation layer of the liquefied gas storage tank, and some of these scaffolding structures are separated and transported using separate transfer equipment. By doing so, it is possible to minimize the operator's manual work and heavy handling during installation or disassembly of the scaffolding structure, thereby preventing the worker's musculoskeletal disorders and reducing the risk of various safety accidents.

In addition, each of the plurality of scaffolding units is provided to have a truss structure, as well as simplifying assembly and installation through lightening, and may have an effect of improving structural stability against vertical bending or torsional deformation.

In addition, in the process of constructing the heat insulating layer, the load support part is rotated with the leg as the center of rotation by the rotation connecting part connecting the leg supporting the scaffold structure and the load distribution support part, so that it is easy to avoid the weld seam or wrinkle area of the membrane, so safety It can have the effect of blocking the risk of accidents in advance and improving work efficiency and productivity.

1 is a view schematically showing the arrangement structure of legs installed on the inner bottom surface of a liquefied gas storage tank.
Figure 2 is a view schematically showing the leg support device of the scaffolding structure according to an embodiment of the present invention.
FIG. 3 is a schematic plan view showing the rotation of the load support shown in FIG. 2 .
Figure 4 is a view schematically showing the side views of Figure 3 (a) and (c).

In order to fully understand the present invention and its operational advantages and objectives 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, in adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed 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 will be omitted. Preferred embodiments of the present invention will be described below, but the technical spirit of the present invention is not limited or limited thereto and can be modified and implemented in various ways by those skilled in the art, of course.

Figure 2 is a view schematically showing a leg support device of a scaffolding structure according to an embodiment of the present invention, Figure 3 is a schematic plane view showing that the load support shown in Figure 2 is rotated, Figure 4 is a view schematically showing the side views of (a) and (c) of FIG.

First, prior to a detailed description of the leg support device of the scaffolding structure according to an embodiment of the present invention, the scaffolding structure for the liquefied gas storage tank will be briefly described first.

In the description of the present invention, liquefied gas is generally liquefied, such as cryogenic (approximately -163 ° C) LNG (Liquified Natural Gas), LPG (Liquefied Petroleum Gas) or liquefied ethylene gas (Liquefied Ethylene Gas). It may include all gaseous fuels stored as , and liquefied gas may mean liquefied gas as well as liquefied gas in a liquid state.

The scaffolding structure of this embodiment, a plurality of scaffolding units (not shown) can be mutually coupled in the vertical direction inside the storage tank to form a plurality of layers, and each of the plurality of scaffolding units is a square or circular pipe-shaped steel pipe (or , square tube) to achieve weight reduction, and may have a truss structure to sufficiently withstand vertical bending deformation.

In this embodiment, each of the plurality of scaffolding units may be preferably transported using a separate transfer equipment to minimize the operator's manual work and heavy handling during the installation or disassembly of the scaffolding structure.

As an example, the transfer equipment is a mobile cart (not shown) having a lifting part having a lifting function on a body part having a driving means so as to be movable in a scaffold structure forming a plurality of floors. ) can be.

Although not shown in the drawings, the scaffolding structure of this embodiment may form a plurality of layers inside the storage tank, and the number of layers of the scaffolding structure may vary depending on the size of the storage tank or design change of the insulation layer inside the storage tank. can be applied

In the scaffolding structure of this embodiment, a part of the scaffolding structure installed inside the storage tank is provided in the form of an enlarged module, and a part of the scaffolding structure is separated and transported using separate transfer equipment, thereby installing or dismantling the scaffolding structure. It can have the effect of minimizing manual work and handling of heavy objects by workers during construction, thereby preventing workers from musculoskeletal diseases and reducing the risk of various safety accidents.

In addition, each of the plurality of scaffolding units is provided to have a truss structure, as well as simplifying assembly and installation through lightening, and may have an effect of improving structural stability against vertical bending or torsional deformation.

On the other hand, as described above, a plurality of legs 110 for supporting the scaffolding structure may be disposed below the scaffolding structure.

Each of the plurality of legs 110 may be connected to the vertical support H of the scaffolding structure to be adjustable in height in the longitudinal direction, and a load support unit 130 is provided at the lower portion thereof to support the entire load of the scaffolding structure. It may be provided to be evenly transmitted to the insulation panel (or insulation box) 10 installed on the inner bottom surface or the bottom surface of the storage tank.

The load support unit 130 of this embodiment may be primarily installed on the bottom surface of the storage tank to support the scaffolding structure, and the insulation panel (or insulation box) 10 is installed on the bottom surface of the storage tank. After the installation process or the construction of the heat insulation layer is completed, it may be secondarily installed on the insulation panel 10 formed on the bottom surface inside the storage tank by adjusting the height of each of the plurality of legs 110.

Here, it is natural that the installation position of each of the plurality of legs 110 can be flexibly applied according to the size of the storage tank for storing liquefied gas or the design change of the insulation layer installed in the storage tank.

Between the leg 110 of the scaffold structure and the insulation panel 10, a sealing wall 20 is installed to prevent leakage of LNG. Conventionally, welding of the membrane sheet 21 constituting the sealing wall 20 is performed. Although the leg 10 was moved in the longitudinal direction to avoid seams or wrinkles 22 (see FIG. 1 (b) and (c)), the risk of safety accidents in the process of moving the leg 10 In addition, it may take a lot of time to adjust so that a uniform load acts on the insulation panel 10 or the sealing wall 20.

An object of the present invention is to provide a leg support device for a scaffolding structure that stably supports the scaffolding structure and facilitates avoiding the welding seam or wrinkled area of the membrane sheet during the construction of the heat insulating layer.

Referring to Figure 2, the leg support device 100 of the scaffolding structure according to an embodiment of the present invention, the load distribution support unit 120 for distributing and supporting the load of the scaffolding structure at the bottom of the leg 110, load distribution The support part 120 may include a rotation connection part 130 connecting the leg 110 and the load distributing support part 120 so as to be horizontally rotatable on the inner bottom surface of the storage tank.

The load distribution support 120 is shown in (a) of FIG. 4 when only the insulation panel (or insulation box) 10 is installed on the bottom surface inside the storage tank and the sealing wall 20 is not installed thereon. As is done, it can be supported on top of the insulation panel (10).

After the sealing wall 20 is installed on the upper portion of the heat insulating panel 10, the load distribution support unit 120 of this embodiment is rotated 180 degrees by the rotation connection unit 130, as shown in FIG. 4 (b). As shown, it may be supported on the upper surface of the membrane sheet 21 .

Conventionally, by moving the leg 10 in the longitudinal direction (see Fig. 1 (b) and (c)) to avoid the weld seam or wrinkle 22 area of the membrane sheet 21, the scaffolding structure Risk of various safety accidents may occur in the process of moving the supporting leg 10 .

The leg support device 100 of the scaffolding structure according to an embodiment of the present invention horizontally rotates only the load distribution support part 120 to avoid the welding seam area or the wrinkle area 22 area of the membrane sheet 21. Since it is possible to avoid the weld seam or wrinkles 22 of the sheet 21, the risk of safety accidents can be prevented, and work efficiency and productivity can be improved.

In this embodiment, it may be preferable that the load distribution support unit 120 is horizontally rotatably provided on the inner bottom surface of the storage tank with the leg 110 as the center of rotation.

The rotation connection unit 130 connects the leg 110 and the load distribution support unit 120 so that the load distribution support unit 120 rotates at a predetermined angle in the horizontal direction, for example, at an angle of 180 degrees with the leg 110 as the center of rotation can serve as a guide.

The rotation connection part 130 of this embodiment may be formed in the form of an axis rotatably coupled to each of the upper and lower ends of the leg 110 and the load distribution support part 120, and fix the load distribution support part 120 at a certain angle. It may be preferable that a stopper (not shown) is provided so as to be able to do so.

On the other hand, the leg support device 100 of the scaffolding structure according to an embodiment of the present invention may further include a support block 140 installed on the lower surface of the load distribution support unit 120.

The support block 140 is to separate the load distribution support 120 from the sealing wall 20 so as not to interfere with the weld seam or the wrinkles 22 area of the membrane sheet 21, and has a predetermined thickness. One or more may be installed on the lower surface of the load distribution support 120 .

In addition, when a single support block 140 is formed in the load distribution support unit 120, an accommodation groove (not marked) is provided on the bottom surface of the support block 140 for accommodating the wrinkled portion 22 of the membrane sheet 21. It may be desirable that this is formed.

The leg support device 100 of the scaffolding structure according to an embodiment of the present invention includes a rotation connection part 130 connecting the leg 110 supporting the scaffolding structure and the load distribution support 120 in the process of constructing the insulation layer inside the storage tank. Since the welding seam of the membrane sheet 21 or the area of the wrinkles 22 can be easily avoided by rotating the load distribution support 130 with the leg 110 as the center of rotation, the risk of safety accidents can be reduced. It can have the effect of blocking it in advance and improving work efficiency and productivity.

Hereinafter, a method for supporting a scaffolding structure using the leg support device 100 having the above configuration will be briefly described.

A method for supporting a scaffolding structure according to an embodiment of the present invention includes the steps of installing the leg support device 100 so that the scaffolding structure is supported on the inner bottom surface of a liquefied gas storage tank, and the legs 110 in the heat insulation layer construction process. The step of adjusting the height so that the load distribution support 120 is positioned on the insulation panel 10 installed on the bottom surface inside the storage tank, and the load distribution support 120 with the leg 110 as the center of rotation It may include horizontally rotating the bottom surface inside the storage tank.

In the step of horizontally rotating the load distribution support unit 120, the welding seam area of the membrane sheet 21 or the wrinkle area 22 area and the may not interfere.

The above description is merely an example of the technical idea of the present invention, and those skilled in the art can make various modifications, changes, and substitutions without departing from the essential characteristics of the present invention. will be.

Therefore, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea 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 construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: leg support device
110: Leg
120: load distribution support
130: rotational connection
140: support block
10: insulation panel (or insulation box)
20: sealing wall
21: Membrane sheet
22: Corrugation

Claims (9)

A device for supporting the legs of a scaffolding structure forming a plurality of layers inside a storage tank, including a plurality of scaffolding units,
A plurality of legs provided under the scaffolding structure; and
Including a load distribution support for distributing and supporting the load of the scaffolding structure at the lower part of the leg,
The load distribution support unit,
Leg support device of a scaffolding structure that is horizontally rotatably provided on the inner bottom surface of the storage tank with the leg as a rotation center. According to claim 1,
Leg support device of the scaffold structure further comprising a rotation connection connecting the load distribution support portion to the leg so that the load distribution support portion is horizontally rotatable on the inner bottom surface of the storage tank. According to claim 1,
The load distribution support unit is a leg support device of a scaffolding structure provided to be rotatable by 180 degrees about the rotation center of the leg. According to claim 1,
The load distribution support unit,
A scaffolding structure that is initially positioned on top of an insulating panel installed on the inner bottom surface of the storage tank and rotates to be positioned on the membrane sheet constituting the sealing wall after the operation of forming the sealing wall on the insulating panel. leg support device. According to claim 4,
Leg support device of the scaffolding structure further comprising one or more support blocks installed on the bottom surface of the load distribution support. According to claim 5,
The support block is
The leg support device of the scaffold structure provided in a single form on the bottom surface of the load distribution support unit and having an accommodation groove for accommodating the wrinkles of the membrane sheet in the support block. A method for supporting the scaffolding structure using the leg support device according to claim 1,
Installing the leg support device to support the scaffolding structure on the inner bottom surface of the storage tank;
adjusting the height of the leg so that the load distribution support is positioned on the heat insulating layer formed on the inner bottom surface of the storage tank in the process of constructing the heat insulating layer inside the storage tank; and
Supporting method of a scaffold structure comprising the step of horizontally rotating the load distribution support on the inner bottom surface of the storage tank with the leg as a rotation center. According to claim 7,
In the step of horizontally rotating the load distribution support, the support method of the scaffolding structure for rotating the load distribution support to be positioned on the membrane sheet formed on the heat insulating layer and constituting the sealing wall. According to claim 8,
In the step of horizontally rotating the load distribution support unit, the leg support device is a scaffolding structure installed so as not to interfere with the weld seam or wrinkle area of the membrane sheet through one or more support blocks installed on the bottom surface of the load distribution support unit. support method.

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