KR102581639B1 - Leg supporting apparatus of scaffold structure and method for supproting scaffold structure using the same - Google Patents

Abstract

It relates to a leg support device for a scaffold structure that includes a plurality of scaffold units and forms a plurality of layers inside a storage tank, comprising: a plurality of legs provided at a lower portion of the scaffold structure; And a load distribution support part that distributes and supports the load of the scaffold structure at the lower part of the leg, and the load distribution support part is provided to be horizontally rotatable on the inner bottom surface of the storage tank with the leg as the center of rotation.

Description

Leg support device for scaffolding structure and method for supporting scaffolding structure using the same {LEG SUPPORTING APPARATUS OF SCAFFOLD STRUCTURE AND METHOD FOR SUPPROTING SCAFFOLD STRUCTURE USING THE SAME}

The present invention relates to a scaffolding structure, and more specifically, to provide a part of a scaffolding structure installed inside a storage tank in the form of an enlarged module for the construction or maintenance of the insulation layer of a liquefied gas storage tank, and to dismantle this scaffolding structure. The present invention relates to a leg support device for a scaffold structure that shortens the work schedule and number of hours and also allows easy avoidance of the weld seam or wrinkle area of the membrane sheet during the insulation layer construction process, and a method of supporting the scaffold structure using the same.

As environmental pollution regulations for ships have recently 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 made by cooling and liquefying methane obtained by refining natural gas collected from a gas field, and liquefied petroleum gas is a fuel made into a liquid by compressing gas containing propane and butane, which are mainly produced along with oil from oil fields, at room temperature. .

In particular, liquefied natural gas (hereinafter referred to as 'LNG') is obtained by cooling natural gas to extremely low temperatures (approximately -163°C), and its volume is reduced to approximately 1/600 compared to gaseous natural gas, making it suitable for sea use. It is very suitable for long distance transportation.

A liquefied gas carrier (LNG carrier) that sails the sea carrying LNG and unloads liquefied gas to land users, or LNG that sails the sea carrying LNG and arrives at land demand destinations, then regasifies the stored LNG and unloads it as natural gas. The RV (LNG Regasification Vessel) is equipped with a storage tank to store LNG at cryogenic temperatures.

In addition, LNG FPSO (Floating Production Storage and Offloading) is used to liquefy and store the produced natural gas directly at sea and transfer the stored LNG to an LNG carrier when necessary, or to store LNG that is unloaded at sea to an LNG carrier. Floating offshore structures, such as LNG FSRU (Floating Storage and Regasification Unit), which vaporize LNG and supply it to onshore customers as needed, are also equipped with storage tanks installed on LNG carriers and LNG RVs.

Such liquefied gas storage tanks can be classified into membrane type and independent type depending on whether the insulation material for storing LNG in a cryogenic state directly acts on the load of the cargo, and is located inside the structural material of the hull. Membrane-type storage tanks with insulation material sandwiched between a barrier that is resistant to low-temperature brittleness and the barrier are widely used.

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

In addition, liquefied gas storage tanks require maintenance work to repair the storage tank when inspection and leakage of liquefied gas are confirmed through monitoring systems such as gas detectors and temperature sensors. Such insulation layer construction and maintenance work are required. For this purpose, a separate scaffolding structure (or scaffold) may be installed in the internal space of the liquefied gas storage tank.

The technical configuration described above is background technology to aid understanding of the present invention, and does not mean that it is a conventional technology widely known in the technical field to which the present invention pertains.

Republic of Korea Patent Publication No. 10-2021-0019253 “Membrane cargo hold scaffold base structure”

At least some of the above-described scaffolding structures have a truss structure, which can improve structural stability against vertical bending or torsional deformation. However, these scaffolding structures have square or square structures within the range that workers can perform manual handling. It is installed by connecting each steel pipe member in the form of a circular pipe with bolts or pins.

To dismantle such a scaffolding structure, each member constituting the scaffolding structure is dismantled and the scaffolding structure is sequentially dismantled layer by layer starting from the top layer using a work elevator (cage size 3x1m) installed inside the storage tank. Not only is it inefficient because the number of working hours and schedules increases due to the installation and disassembly of each member, but the incidence of workers' musculoskeletal disorders and various safety accidents due to scaffolding members with excessive weight may increase.

Figure 1 is a diagram schematically showing the arrangement structure of legs installed on the internal floor of a liquefied gas storage tank. Referring to Figure 1, in order to distribute and support the load of the scaffold structure and the load of the material, the internal floor of the storage tank is shown. 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 inner floor of the storage tank (see (a) of FIG. 1), 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 to prevent leakage of LNG is installed between the legs 30 of the scaffold structure and the insulation panel 10.

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

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

In addition, the scaffold structure according to the prior art has legs 30 to avoid the welding seam area and/or the corrugation area 22 of the membrane sheet 21 constituting the sealing wall 20. was moved in the longitudinal direction (see (b) and (c) of Figures 1), but not only was there a risk of a safety accident in the process of moving the leg 30, but also there was a risk of damage on the insulation panel 10 or the sealing wall 20. It takes a lot of time to adjust the load to be uniform, which can reduce work efficiency and productivity, so improvement measures are required.

The present invention minimizes workers' manual labor and handling of heavy objects when installing or dismantling a scaffolding structure installed inside a storage tank for construction or maintenance work of the insulation layer of a liquefied gas storage tank, thereby preventing workers' musculoskeletal disorders and reducing the risk of various safety accidents. The purpose is 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 the scaffold structure and easily avoids the weld seam area or wrinkle area of the membrane sheet during the insulation layer construction process, and a method of supporting the scaffold structure using the same. for a different purpose.

According to one aspect of the present invention, an apparatus for supporting the legs of a scaffold structure that includes a plurality of scaffold units and forms a plurality of layers inside a storage tank, comprising: a plurality of legs provided at a lower portion of the scaffold structure; And a leg support device for a scaffold structure including a load distribution support portion that distributes and supports the load of the scaffold structure at the lower part of the leg.

The load distribution support unit may be provided to rotate horizontally on the inner bottom surface of the storage tank with the leg as the center of rotation.

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

Additionally, the load distribution support unit may be provided to be able to rotate 180 degrees around the leg as a rotation center.

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

In addition, it may further include one or more support blocks installed on the bottom of the load distribution support unit.

In addition, the support block is provided in a single form on the bottom of the load distribution support portion, and a receiving groove for receiving the wrinkled portion of the membrane sheet may be formed in the support block.

According to another aspect of the present invention, a method for supporting the scaffold structure using the leg support device includes the steps of installing the leg support device to support the scaffold structure on the inner floor of the storage tank; Adjusting the height of the leg during the construction of the storage tank internal insulation layer to position the load distribution support unit on the insulation layer formed on the internal floor of the storage tank; And a method of supporting a scaffolding structure including the step of rotating the load distribution support unit horizontally on the inner floor of the storage tank with the leg as the center of rotation.

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

In addition, in the step of horizontally rotating the load distribution support unit, the leg support device is installed so as not to interfere with the weld seam area or wrinkle area of the membrane sheet through one or more support blocks installed on the bottom surface of the load distribution support unit. You 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 a part of this scaffolding structure is separated and transported using separate transport equipment. By doing so, it can have the effect of minimizing workers' manual labor and handling of heavy objects when installing or dismantling scaffolding structures, thereby preventing workers' musculoskeletal disorders and reducing the risk of various safety accidents.

In addition, each of the plurality of scaffolding units is provided with a truss structure, which not only simplifies assembly and installation through weight reduction, but also improves structural stability against vertical bending or torsional deformation.

In addition, during the construction of the insulation layer, the rotational connection connecting the leg supporting the scaffolding structure and the load distribution support section rotates the load support section around the leg rotation center, making it easier to avoid the weld seam area or wrinkle area of the membrane, thus ensuring safety. It can have the effect of preventing the risk of accidents and improving work efficiency and productivity.

Figure 1 is a diagram schematically showing the arrangement structure of legs installed on the inner floor of a liquefied gas storage tank.
Figure 2 is a diagram schematically showing a leg support device of a scaffold 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 diagram schematically showing the side view of Figures 3 (a) and (c).

In order to fully understand the present invention, its operational advantages, and the objectives achieved by practicing 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 attached drawings. First, when adding reference signs to components in each drawing, it should be noted that the same components are given the same reference numerals as much as possible even if they are shown in different drawings.

Additionally, 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 it goes without saying that the technical idea of the present invention is not limited or limited thereto and may be modified and implemented in various ways by those skilled in the art.

Figure 2 is a diagram schematically showing a leg support device of a scaffold structure according to an embodiment of the present invention, Figure 3 is a schematic plan view showing the rotation of the load support shown in Figure 2, and Figure 4 is a diagram schematically showing the side view of Figures 3 (a) and (c).

First, before explaining in detail the leg support device of the scaffold structure according to an embodiment of the present invention, the scaffold structure for a liquefied gas storage tank will first be briefly described.

In explaining the present invention, liquefied gas is generally liquefied, such as LNG (Liquified Natural Gas) at extremely low temperature (approximately -163°C), LPG (Liquefied Petroleum Gas), and Liquefied Ethylene Gas. It can include all gas fuels stored as liquefied gas, and liquefied gas can mean not only liquefied gas in liquid state but also vaporized liquefied gas.

The scaffolding structure of this embodiment may form a plurality of layers by combining a plurality of scaffolding units (not shown) in the vertical direction inside the storage tank, and each of the plurality of scaffolding units is a steel pipe (or , square pipe), it can achieve weight reduction, and can also have a truss structure to sufficiently withstand vertical bending deformation.

In this embodiment, it may be desirable for each of the plurality of scaffolding units to be transported using separate transport equipment to minimize manual labor and handling of heavy objects by workers during the installation or dismantling of the scaffold structure.

As an example, the transfer equipment is a mobile cart (not shown) having an elevating part with a lifting function on a body part with traveling means to enable movement within a scaffold structure forming a plurality of layers. ) can be.

Although not shown in the drawings, the scaffold structure of this embodiment can form a plurality of layers inside the storage tank, and the number of layers of the scaffold structure varies depending on the size of the storage tank or changes in the design of the insulation layer inside the storage tank. It can be applied.

The scaffolding structure of this embodiment prepares a part of the scaffolding structure installed inside the storage tank in the form of an enlarged module, and parts of this scaffolding structure are separated and transported using separate transport equipment, so that the scaffolding structure can be installed or dismantled. By minimizing workers' manual labor and handling of heavy objects, it can have the effect of preventing workers' musculoskeletal disorders and reducing the risk of various safety accidents.

In addition, each of the plurality of scaffolding units is provided with a truss structure, which not only simplifies assembly and installation through weight reduction, but also improves structural stability against vertical bending or torsional deformation.

Meanwhile, as described above, a plurality of legs 110 for supporting the scaffold structure may be disposed at the lower part of the scaffold structure.

Each of the plurality of legs 110 may be connected to a vertical support (H) of the scaffold structure, so that its longitudinal height can be adjusted, and a load support portion 130 may be provided at the lower part thereof to load the entire scaffold structure. It can be provided to be evenly transmitted to the insulation panel (or insulation box) 10 installed on the inner floor or floor of the storage tank.

The load support portion 130 of this embodiment may be primarily installed on the floor inside the storage tank to support the scaffolding structure, and an insulation panel (or insulation box) 10 may be installed on the floor inside the storage tank. During the installation process or after the construction of the insulation layer is completed, the height of each of the plurality of legs 110 can be adjusted and the legs 110 can be secondarily installed on the insulation panel 10 formed on the inner floor of the storage tank.

Here, it may be natural that the installation position of each of the plurality of legs 110 can be flexibly applied depending on the size of the storage tank storing the liquefied gas or changes in the design of the insulation layer installed in the storage tank.

A sealing wall 20 to prevent leakage of LNG is installed between the legs 110 of the scaffold structure and the insulation panel 10. Conventionally, the membrane sheet 21 constituting the sealing wall 20 is welded. The leg 10 was moved in the longitudinal direction to avoid the seam area or the wrinkle area 22 (see (b) and (c) of Figures 1), but there was a risk of safety accidents in the process of moving the leg 10. In addition, it may take a lot of time to adjust the load to be uniform on the insulation panel 10 or the sealing wall 20.

The present invention is intended to provide a leg support device for a scaffold structure that stably supports the scaffold structure and facilitates avoidance of weld seam or wrinkle areas of the membrane sheet during the insulation layer construction process.

Referring to Figure 2, the leg support device 100 of the scaffold structure according to an embodiment of the present invention includes a load distribution support portion 120 that distributes and supports the load of the scaffold structure at the lower part of the leg 110, and a load distribution The support part 120 may include a rotational connection part 130 connecting the leg 110 and the load distribution support part 120 so that the support part 120 can rotate horizontally on the inner bottom surface of the storage tank.

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

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

Conventionally, the leg 10 is moved in the longitudinal direction (see (b) and (c) of FIG. 1) to avoid the weld seam area or the wrinkle area 22 of the membrane sheet 21, thereby constructing the scaffold structure. In the process of moving the supporting leg 10, the risk of various safety accidents may occur.

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

In this embodiment, the load distribution support unit 120 is provided to be horizontally rotatable on the inner floor of the storage tank with the leg 110 as the center of rotation, and the center line of the shape of the bottom surface of the load distribution support unit 120 rotates. It may be desirable to be eccentric with respect to the center.

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

The rotation connector 130 of this embodiment may be formed in the form of a shaft in which the upper and lower ends are rotatably coupled to each of the legs 110 and the load distribution support 120, and fixes the load distribution support 120 at a certain angle. It may be desirable to provide a stopper (not shown) to enable this.

Meanwhile, the leg support device 100 of the scaffold structure according to an embodiment of the present invention may further include a support block 140 installed on the bottom of the load distribution support portion 120.

The support block 140 is designed to separate the load distribution support portion 120 from the sealing wall 20 to prevent it from interfering with the weld seam area or the wrinkle area 22 of the membrane sheet 21, and has a predetermined thickness. One or more may be installed on the bottom of the load distribution support unit 120.

In addition, when a single support block 140 is formed on the load distribution support portion 120, the bottom of the support block 140 has a receiving groove (unmarked) for receiving the corrugated portion 22 of the membrane sheet 21. It may be desirable for this to be formed.

The leg support device 100 of the scaffolding structure according to an embodiment of the present invention includes a rotating connection part 130 that connects the leg 110 supporting the scaffolding structure and the load distribution support portion 120 during the construction of the insulation layer inside the storage tank. Provided with, the center line of the shape of the bottom surface of the load distribution support unit 120 is eccentric with respect to the center of rotation, and the load distribution support unit 130 is rotated with the leg 110 as the rotation center to weld the membrane sheet 21. Since it can be easier to avoid the seam area or the wrinkle area 22, it can have the effect of preventing the risk of safety accidents and improving work efficiency and productivity.

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

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

In the step of horizontally rotating the load distribution support unit 120, the weld seam area or wrinkle area 22 of the membrane sheet 21 is moved through one or more support blocks 140 installed on the bottom of the load distribution support unit 120. There may be no interference.

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

Accordingly, the embodiments disclosed in the present invention and the attached drawings are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments and the attached drawings. .

In addition, the scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

100: Leg support device
110: Leg
120: load distribution support
130: rotation 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 at the lower part of the scaffold structure; and
It includes a load distribution support portion that distributes and supports the load of the scaffold structure at the lower part of the leg,
The load distribution support part,
A leg support device for a scaffold structure that is provided to be horizontally rotatable on the inner bottom surface of the storage tank with the leg as the center of rotation, and wherein the geometric center line of the bottom surface of the load distribution support portion is eccentric with respect to the center of rotation. According to clause 1,
The leg support device of the scaffolding structure further includes a rotational connection part connecting the leg and the load distribution support unit so that the load distribution support unit can rotate horizontally on the inner floor surface of the storage tank. According to clause 1,
The load distribution support unit is a leg support device of a scaffold structure provided to rotate the leg 180 degrees about the rotation center. According to clause 1,
The load distribution support part,
A scaffold structure that is initially positioned on the top of an insulation panel installed on the inner floor of the storage tank and, after the operation of forming a sealing wall on the insulation panel, is rotated to be positioned on the membrane sheet constituting the sealing wall. Leg support device. According to clause 4,
A leg support device for a scaffold structure further comprising one or more support blocks installed on the bottom of the load distribution support unit. According to clause 5,
The support block is,
A leg support device for a scaffold structure, wherein the load distribution support portion is provided in a single form on the bottom surface, and a receiving groove for receiving the wrinkled portion of the membrane sheet is formed in the support block. A method for supporting the scaffold structure using the leg support device according to claim 1,
Installing the leg support device to support the scaffold structure on the inner floor of the storage tank;
Adjusting the height of the leg during the construction of the storage tank internal insulation layer to position the load distribution support unit on the insulation layer formed on the internal floor of the storage tank; and
A method of supporting a scaffolding structure comprising the step of horizontally rotating a load distribution support portion, in which the center line of the bottom surface of the load distribution support portion is eccentric with respect to the center of rotation, with the leg as the center of rotation, on the inner floor of the storage tank. According to clause 7,
In the step of horizontally rotating the load distribution support, the load distribution support is rotated to be positioned on a membrane sheet formed on the heat insulating layer and constituting a sealing wall. According to clause 8,
In the step of horizontally rotating the load distribution support unit, the leg support device is a scaffold structure installed so as not to interfere with the weld seam area or wrinkle area of the membrane sheet through one or more support blocks installed on the bottom of the load distribution support unit. Support method.

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