KR102393313B1 - Mooring system including line tension control device of offshore floating structure - Google Patents

Abstract

Provided is a mooring system for a floating offshore structure including a variable tension control device. According to the present invention, the mooring system comprises: a floating body which can float on the sea; an anchor which can be installed on the seabed; a mooring line connected between the floating body and the anchor; and a variable tension control device installed on the floating body or anchor to adjust the length of the mooring line between the floating body and the anchor. The variable tension control device provides an elastic force for pulling the mooring line so that the length of the mooring line is variable, and, when a tension greater than the elastic force is applied to the mooring line, may compensate the mooring line for the length varied by the elastic force.

Description

MOORING SYSTEM INCLUDING LINE TENSION CONTROL DEVICE OF OFFSHORE FLOATING STRUCTURE

The present invention relates to a mooring system for a floating offshore structure including a variable tension control device.

Globally, there is a trend to reduce energy production using fossil fuels and increase electricity production using renewable energy such as solar power, wind power and hydrogen energy. In particular, according to the domestic renewable energy policy project, interest in the project is increasing day by day.

Recently, solar power generation projects, including wind power generation projects, are highly efficient, and the construction of offshore power plants is being promoted to solve many civil complaints that occur during land installation. As a direct example, in the case of a solar power plant installed on land, a lot of heat is generated during the power generation process, and high heat is transmitted from the land where the power plant is located to the solar panel. holding

However, in order to solve the conventional problems and secure a large installation area and abundant sunlight, a floating solar power plant in which a solar panel is installed on the water surface, such as a reservoir or a dam, has been proposed. In particular, in recent years, there is a trend to develop offshore photovoltaic power plants installed on the inland waters of the seawall or offshore to solve problems of lack of location or civil complaints.

As such, for the new and renewable energy business, a wind power generator or a solar panel is installed on a floating structure and installed in a floating state, and a mooring line is installed for an offshore power plant to prevent drifting in the sea.

When a conventional floating structure is installed as a mooring line, the mooring line is installed in a state where only both ends of the mooring line are fixed like a catenary using a chain or a wire, or vertically connected to the sea floor using a mooring line having high tension.

In the case of sunlight installed on the inner water surface of a low-water reservoir or seawall, a chimney is installed in the middle of the mooring line to give tension to the catenary-shaped mooring line. When the mooring line relaxes a lot due to deviation from the additional mooring line or due to a sharp drop in sea level, problems arise in which the floating structure moves out of its installation position or rotates. In addition, if the pendulum does not deviate from the sea floor, the mooring line cannot be unfolded normally, so excessive tension is applied to the mooring line or the floating body is submerged.

In addition, in the case of an elastic mooring device including an elastic rope, the production cost is very high because a special material of rubber or wire is used to realize high elastic force. Floating structures cause unstable conditions.

In this way, when an abnormal state of the mooring system occurs, there is a problem in that the energy generation efficiency is lowered, and there is a problem in that economic loss occurs such as a lot of maintenance costs.

Domestic Registered Patent Publication No. 10-1518382 (Registered on May 7, 2015)

Embodiments of the present invention respond to various load conditions applied to a mooring line for safe mooring of a floating structure and mooring a floating offshore structure including a variable tension control device capable of varying the mooring line by several meters when a large water level difference occurs We want to provide a system.

The problems to be solved in the present invention are not limited to those mentioned above, and other problems not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs through the following contents.

According to an aspect of the present invention, a floating body capable of floating on the sea; anchors that can be installed on the seabed; a mooring line connected between the float and the anchor; and a variable tension control device installed on the floating body or the anchor to adjust the length of the mooring line between the floating body and the anchor, wherein the variable tension control device pulls the mooring line so that the length of the mooring line is variable A mooring system for a floating offshore structure comprising a variable tension control device capable of providing an elastic force, but capable of compensating for the mooring vessel with a length changed by the elastic force when a tension greater than the elastic force is applied to the mooring vessel. can

In this case, the variable tension control device includes a control wire to which the mooring line is connected; a housing providing a central flow path through which the control wire passes; and a tension control unit providing an elastic force for pulling the control wire in an outer diameter direction of the central flow path.

In addition, the housing may include a main body having an inlet/outlet through which the control wire can be entered and exited at an end thereof, and to which the tension control unit is fixedly installed; a roller unit installed at the outlet to support the control wire discharged from the main body; and a guide pin that supports the variable wire so that the adjustment wire has an inflection portion and is disposed in the central flow path.

In addition, the tension control unit may include a mounting bracket fixedly installed on one side or the other side of the housing; a rotary arm mounted on the mounting bracket so as to be rotatable toward the central flow path, and to one end of which the control wire is movably connected; an elastic spring providing an elastic force to the rotary arm so that the adjustment wire is pulled away from the central flow path; and a crankshaft for transmitting the elastic force of the elastic spring to the rotary arm.

In addition, the tension control unit may include a support piece disposed to be spaced apart from the mounting bracket with the elastic spring interposed therebetween; and a variable shaft connected to a variable length between the support piece and the mounting bracket, and a hinged end of the crankshaft.

In addition, the tension control unit may be provided with two or more installed opposite to one side and the other side of the housing with the central flow path interposed therebetween.

In addition, the tension control unit may be spaced apart to form two or more rows in the longitudinal direction of the housing so that the control wire is deployed in a zigzag form with the central flow path interposed therebetween.

In addition, the crankshaft may include support pieces for supporting both ends of the elastic spring; a variable shaft connecting the first support piece and the second support piece to be variable in length; and a link piece having one end hinge-connected to one side of the variable shaft and the other end hinge-connected to the other end of the rotary arm.

Embodiments of the present invention can respond to various load conditions applied to the mooring line by using the tension control unit, and have the advantage of being able to appropriately respond to large water level changes through displacement elongation of several meters or more, regardless of water depth or the length of the mooring line. there is.

In addition, the embodiments of the present invention have the advantage that the mooring performance of the mooring system can be improved by minimizing the fatigue load applied to the mooring vessel in an environment that continuously changes for a long time as well as an instantaneously changing marine environment, thereby guaranteeing the design life. There is this.

In addition, the embodiments of the present invention can utilize the variable tension control device as an auxiliary floating body, thereby absorbing the load acting on the main floating body, and are more efficient in maintenance compared to the conventional elastic mooring device located in the water. Since accessibility is guaranteed, there is an advantage that maintenance costs can be greatly reduced.

1 is a block diagram showing a mooring system of a floating offshore structure according to an embodiment of the present invention.
FIG. 2 is an internal configuration diagram illustrating the variable tension control device of FIG. 1 .
3 is a side view of the variable tension control device viewed from the line "AA" of FIG.
FIG. 4 is an enlarged view showing the tension control unit of FIG. 2 .
5 is a state diagram illustrating a state change of a mooring system of a floating offshore structure when an external force is applied to the tension control unit according to an embodiment of the present invention.
6 is an internal configuration diagram illustrating the variable tension control device of FIG. 5 .
FIG. 7 is an enlarged view showing the tension control unit of FIG. 5 .

Hereinafter, specific embodiments for implementing the spirit of the present invention will be described in detail with reference to the drawings.

In addition, in the description of 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.

In addition, when it is said that a component is 'connected', 'supported', 'connected', 'supplied', 'transferred', or 'contacted' to another component, it is directly connected, supported, connected, It should be understood that supply, delivery, and contact may occur, but other components may exist in between.

The terminology used herein is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In addition, in the present specification, the expressions of the upper side, the lower side, the side, etc. are described with reference to the drawings, and it is to be noted in advance that if the direction of the corresponding object is changed, it may be expressed differently. For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings, and the size of each component does not fully reflect the actual size.

Also, terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various components, but the components are not limited by these terms. These terms are used only for the purpose of distinguishing one component from another.

The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and other specific characteristic, region, integer, step, operation, element, component, and/or group. It does not exclude the existence or addition of

Hereinafter, a detailed configuration of a mooring system for a floating offshore structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7 .

1 to 7, the mooring system 10 of a floating offshore structure according to an embodiment of the present invention includes a floating body 100, an anchor 200, a mooring line 300, and variable tension control. device 400 may be included.

Specifically, the floating body 100 may be an operable device in a floating state on the sea. For example, the floating body 100 may include a photovoltaic device provided with a solar panel for photovoltaic power generation. It is important for the photovoltaic device to maintain its orientation without rotating so that it can receive sunlight abundantly regardless of the water level difference. Through the mooring line 300 with variable length, it is possible to effectively respond to low and high water levels. Of course, the floating body 100 is not limited to the solar power generation device, and the floating body 100 may be various types of offshore structures in addition to the solar power generation device.

The anchor 200 is an anchor block for stably fixing the floating body 100 , and may be installed on the seabed. The anchor 200 may be connected to the floating body 100 through the mooring line 300 to position the floating body 100 on a designated area.

The number of anchors 200 may correspond to the number of mooring lines 300 . For example, the anchor 200 may include a first anchor 201 and a second anchor 202 for stably mooring one side and the other side of the floating body 100 . The first anchor 201 and the second anchor 202 may prevent the floating body 100 from moving to another position through the mooring line 300 . In the present embodiment, the anchor 200 is composed of the first anchor 201 and the second anchor 202, but in addition to these first anchor 201 and the second anchor 202, the stability of the floating body 100 is For position fixation, a larger number of anchors 200 may be used.

The mooring line 300 may be connected between the floating body 100 and the anchor 200 . The mooring line 300 is a connecting member connecting the floating body 100 and the anchor 200, and a wire, a rope, a chain, etc. may be used. The mooring line 300 may have a variable length through the variable tension control device 400 .

A plurality of mooring lines 300 may be provided each connected to a plurality of anchors 200 . In the present embodiment, two mooring lines 300 are illustrated in the drawings as being installed on the floating body 100 , but the present invention is not limited thereto, and four mooring lines 300 may be installed on the floating body 100 . In addition, if necessary, four or more mooring lines 300 may be installed on the floating body 100 .

The variable tension control device 400 may be installed on the floating body 100 or the anchor 200 . For example, the variable tension control device 400 may include a first variable tension control device 401 installed on the floating body 100 and a second variable tension control device 402 installed on the anchor 200 . . In the present embodiment, the variable tension control device 400 is installed on the floating body 100 and the anchor 200, respectively, but a plurality of the variable tension control devices 400 are installed only on the floating body 100, or the anchor 200. It may be possible to install a plurality of them.

The first variable tension control device 401 and the second variable tension control device 402 provide a constant tension to the mooring line 300, but when the water level difference greatly changes, the first variable tension control device 401 and the second variable tension control device 401 2 The mooring line 300 can be extended by the mechanical movement of the variable tension control device 402 to respond to a change in the water level difference. In addition, the first variable tension control device 401 and the second variable tension control device 402 maintain the mooring line 300 in a tensioned state at all times regardless of the water level difference, so that the floating object does not deviate from or rotate in a predetermined area. can support In addition, since the first variable tension control device 401 and the second variable tension control device 402 are installed at both ends of the mooring line 300, the fatigue load applied to the connection portion of the mooring line 300 can be minimized. .

The variable tension control device 400 may provide tension for length adjustment to the mooring vessel 300 . The variable tension control device 400 may provide an elastic force for pulling the mooring line 300 through the control wire 430 so that the overall length of the mooring line 300 is shortened. In addition, when an external tension greater than the elastic force is applied to the mooring line 300 , the variable tension control device 400 may compensate the entire length of the mooring line 300 shortened by the elastic force to the original length.

To this end, the variable tension control device 400 may include a housing 410 , a tension control unit 420 and an adjustment wire 430 . The control wire 430 may be connected to an end of the mooring line 300 . In the present embodiment, the adjustment of the length of the mooring line 300 is implemented by changing the length of the adjustment wire 430 , but in some cases, the adjustment wire 430 may be integrally configured with the mooring line 300 .

The housing 410 may include a body part 411 , a roller part 412 , and a guide pin part 413 . The main body 411 may constitute an external appearance of the variable tension control device 400 . An inlet/outlet 411a through which the control wire 430 can enter and exit may be formed at an end of the main body 411 . A central flow path W through which the control wire 430 passes may be provided inside the main body 411 .

The roller 412 may be installed at the inlet/outlet 411a of the main body 411 to support the control wire 430 discharged from the main body 411 . The roller unit 412 may be a roller in which at least a portion of an outer surface supports the control wire 430 . The roller unit 412 may be configured as a pair disposed to face each other with the control wire 430 interposed therebetween.

The guide pin 413 may support the inflection portion of the adjustment wire 430 pulled by the tension control unit 420 . The guide pin 413 may be provided in the form of a pair of guide pins installed in the central flow path W.

The tension control unit 420 may provide an elastic force that pulls the adjustment wire 430 in the outer diameter direction of the central flow path W. For example, the tension control unit 420 may be provided with two or more installed opposite to one side and the other side of the housing 410 with the central flow path W interposed therebetween. In this embodiment, when the housing 410 has a rectangular parallelepiped shape, the tension control unit 420 is configured as a pair facing each other with the central flow path W interposed therebetween, but when the housing 410 has a cylindrical shape, It may be composed of one or more pairs facing radially with the central flow path W of the housing 410 interposed therebetween.

The tension control unit 420 is spaced apart to form two or more rows in the longitudinal direction of the housing 410, so that the control wire 430 has a zigzag shape with the central flow path W interposed therebetween, that is, the housing 410. may be continuously deployed from one side to the other side and from the other side to one side. In this way, since the plurality of tension control units 420 are arranged in parallel to connect the control wire 430 in a zigzag form, when a predetermined external force is transmitted to the control wire 430 through the mooring line 300 , the tension The tension of the control wire 430 may be adjusted by the operation characteristics of the control unit 420 . In addition, since the tension applied to the adjustment wire 430 is adjusted, the fatigue load applied to the mooring line 300 itself can be reduced.

The tension control unit 420 supports the same load by the elastic force of the elastic spring 423 and the mechanical movement between the crankshaft 424 and the rotary arm 422, but the rotary arm 422 in the direction in which the force is applied. It may be configured such that the displacement is extended by the length of .

To this end, the tension control unit 420 may include a mounting bracket 421 , a rotary arm 422 , an elastic spring 423 , a crankshaft 424 , a support piece 425 , and a variable shaft 426 . . The mounting bracket 421 may be a bracket for fixing the rotary arm 422 and the elastic spring 423 to one side or the other side of the housing 410 . An elastic spring 423 may be supported at one end of the mounting bracket 421 , and a rotary arm 422 may be rotatably hinged to the other side of the mounting bracket 421 .

The rotary arm 422 may be mounted on the mounting bracket 421 so as to be rotatable toward the central flow path (W). The rotary arm 422 may be configured in a triangular shape as a whole. A movable pin 422c to which the control wire 430 is movably connected may be provided at one end of the rotary arm 422 . And a first hinge point 422a hingedly connected to the end of the crankshaft 424 and a second hinge point 422b hingedly connected to the mounting bracket 421 may be provided at the other end of the rotary arm 422 . there is.

The elastic spring 423 may be disposed between the mounting bracket 421 and the support piece 425 to provide an elastic force to the rotary arm 422 so that the adjustment wire 430 is pulled from the central flow path W. For example, the elastic spring 423 may maintain a state in which the adjustment wire 430 is pulled from the central flow path W by maintaining the normal tension state, but the tension greater than the elastic force of the elastic spring 423 is greater than that of the mooring line 300 . ), the elastic spring 423 is compressed. At this time, the adjustment wire 430 in a state pulled by the elastic spring 423 compensates the mooring line 300 for the length pulled while the elastic spring 423 is compressed. By doing so, it is possible to provide an effect that the length of the mooring line 300 is extended. The elastic spring 423 may apply an elastic force to the rotary arm 422 so that the length of the control wire 430 extending inside the housing 411 is increased. For example, the elastic spring 423 may provide an elastic force to the rotary arm 422 so that the flow pin 422c moves in a direction away from the central flow path.

The crankshaft 424 may transmit the elastic force of the elastic spring 423 to the rotary arm 422 . And one end of the crankshaft 424 may be hingedly connected to the side of the variable shaft 426, and the other end of the crankshaft 424 is hinged to the corner of the rotary arm 422 through a first hinge point 422a. can

The support piece 425 may be spaced apart from the mounting bracket 421 with the elastic spring 423 interposed therebetween. The support piece 425 may be closer to the mounting bracket 421 when the elastic spring 423 is compressed, and may be farther away from the mounting bracket 421 when the elastic spring 423 is tensioned. An end of the variable shaft 426 may be fixed to the support piece 425 .

The variable shaft 426 may be connected to a variable length between the support piece 425 and the mounting bracket 421 . An end of the crankshaft 424 may be hinged to the side of the variable shaft 426 . The length of the variable shaft 426 may be shortened when the elastic spring 423 is compressed, and may be lengthened when the elastic spring 423 is tensioned.

Hereinafter, the operation and effect of the mooring system of the floating offshore structure having the above-described configuration will be described.

Referring back to FIGS. 1 and 2 , when the sea level is at a low water level, the tension control unit 420 in the first variable tension control device 401 and the second variable tension control device 402 is configured to pull the mooring line 300 . An elastic force is provided to the adjustment wire 430 through the elastic spring 423 .

For example, when the elastic spring 423 applies an elastic force for pulling the mooring line 300 to the crankshaft 424 , the crankshaft 424 is a rotational force for pulling the adjustment wire 430 in the outer diameter direction of the central flow path (W). is applied to the rotary arm 422 . At this time, the plurality of rotary arms 422 in the variable tension control device 400 pulls the control wire 430 in a direction away from the central flow path W, so that the control wire 430 is the variable tension control device 400 . You can maintain the folded state in a zigzag form inside.

When the adjustment wire 430 is folded in a zigzag shape in the variable tension control device 400 , the mooring line 300 connected to the adjustment wire 430 matches the distance between the floating body 100 and the anchor 200 as a whole. As it is shortened, the tension applied to the mooring line 300 can be adjusted.

Meanwhile, referring again to FIGS. 5 to 6 , when an external force (tension) greater than the elastic force of the elastic spring 423 is applied to the mooring ship 300 when the sea level is high, the first variable tension control device 401 and the second 2 The tension control unit 420 in the variable tension control device 402 compensates the mooring line 300 for the length changed by the elastic force.

For example, when an external force (tension) is transmitted to the control wire 430 through the mooring line 300, the rotary arm 422 in the tension control unit 420 rotates to converge in a direction closer to the central flow path W, and , while the rotational force of the rotary arm 422 is transmitted to the elastic spring 423 through the crankshaft 424, the elastic spring 423 is compressed.

When the adjustment wire 430 converges closer to the central flow path W in the variable tension control device 400, the adjustment wire 430 folded in a zigzag shape is spread out in a straight line, and at this time, the mooring line 300 is a floating body While overall lengthening to match the distance between 100 and the anchor 200, the tension applied to the mooring line 300 can be adjusted.

As described above, the present invention can respond to various load conditions applied to the mooring line by using the tension control unit, and it is easy to respond to large water level changes through displacement elongation of several meters or more, regardless of water depth or mooring line length. It has excellent advantages such as improving the mooring performance of the mooring system by guaranteeing the design life by minimizing the fatigue load applied to the mooring vessel in the continuously changing environment for a long time as well as the changing marine environment.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can realize that the present invention can be embodied in other specific forms without changing its technical spirit or essential features. you will be able to understand For example, those skilled in the art may change the material, size, etc. of each component according to the field of application, or combine or substitute the embodiments in a form not clearly disclosed in the embodiment of the present invention, but this is also the present invention that does not exceed the scope of Therefore, the embodiments described above are not to be understood as illustrative and limiting in all respects, and it should be said that these modified embodiments are included in the technical spirit described in the claims of the present invention.

100: floating body
200: anchor 300: mooring line
400: variable tension control device 410: housing
411: body part 411a: entrance and exit
412: roller part
413: guide pin 420: tension control unit
421: Mounting bracket 422: Rotating arm
423: elastic spring 424: crankshaft
425: support piece 426: variable shaft

Claims (7)

Floating body 100 capable of floating in the sea;
An anchor 200 that can be installed on the seabed;
a mooring line 300 connected between the floating body 100 and the anchor 200; and
and a variable tension control device 400 installed on the floating body 100 or the anchor 200 so that the length of the mooring line 300 between the floating body 100 and the anchor 200 is adjusted. ,
The variable tension control device 400 is
The control wire 430 to which the mooring line 300 is connected, the housing 410 providing a central flow path through which the control wire 430 passes, and the control wire 430 are pulled in the outer diameter direction of the central flow path It includes a tension control unit 420 that provides an elastic force, and provides an elastic force for pulling the mooring line 300 so that the length of the mooring line 300 is variable, but a tension greater than the elastic force is applied to the mooring line 300 . When compensating for the length varied by the elastic force to the mooring line (300),
A mooring system for a floating offshore structure including a variable tension control device. delete The method of claim 1,
The housing 410 is
a main body portion 411 having an input/exit port 411a through which the control wire 430 can enter and exit, and to which the tension control unit 420 is fixedly installed;
a roller part 412 installed at the inlet/outlet 411a to support the control wire 430 discharged from the body part 411; and
Supporting the control wire 430 to have an inflection portion, and including a guide pin portion 413 disposed in the central flow path,
A mooring system for a floating offshore structure including a variable tension control device. The method of claim 1,
The tension control unit 420 is
a mounting bracket 421 fixedly installed on one side or the other side of the housing 410;
a rotary arm 422 mounted to the mounting bracket 421 so as to be rotatable toward the central flow path, and to which the control wire 430 is movably connected to one end thereof;
an elastic spring 423 providing an elastic force to the rotary arm 422 so that the adjustment wire 430 is pulled away from the central flow path; and
Containing a crankshaft 424 for transmitting the elastic force of the elastic spring 423 to the rotary arm 422,
A mooring system for a floating offshore structure including a variable tension control device. 5. The method of claim 4,
The tension control unit 420 is
a support piece 425 spaced apart from the mounting bracket 421 with the elastic spring 423 interposed therebetween; and
Further comprising a variable shaft 426 connected to a variable length between the support piece 425 and the mounting bracket 421, and to which an end of the crankshaft 424 is hinged,
A mooring system for a floating offshore structure including a variable tension control device. The method of claim 1,
The tension control unit 420 is
Provided with two or more installed opposite to one side and the other side of the housing 410 with the central flow path interposed therebetween,
A mooring system for a floating offshore structure including a variable tension control device. 7. The method of claim 6,
The tension control unit 420 is
The control wire 430 is spaced apart to form two or more rows in the longitudinal direction of the housing 410 so that it is deployed in a zigzag form with the central flow path therebetween,
A mooring system for a floating offshore structure including a variable tension control device.

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