KR102192138B1 - Water level control system of floating marine structure - Google Patents

Abstract

The present invention can minimize the load on the mooring device due to the change in water level by restraining the remaining 5 degrees of freedom of the floating floating structure except for HEAVING, thereby significantly extending the durability and life of the structure. It discloses a water level control system of a floating floating structure that can significantly reduce installation costs.

Description

Water level control system of floating floating structures {WATER LEVEL CONTROL SYSTEM OF FLOATING MARINE STRUCTURE}

The present invention and a rectangular main shaft floating on the water surface; It is provided on each side of the main shaft, the top is open, the inside is empty, and a drain hole is formed in the bottom surface. It is filled with water when the water level is increased and inside when the water level is decreased. A buoyancy tank for maintaining the center of buoyancy of the main shaft while minimizing the effect of a change in water level while the filled water is discharged to the outside through the drain hole; A connecting bar coupled along a horizontal direction to each corner of the pair of buoyancy tanks arranged in an orthogonal state; A buoyancy bar which is vertically coupled to connect the other end of each of the connecting bars, and is provided with a buoyancy body for providing buoyancy on a bottom surface to be suspended in the water; A hole of the shape corresponding to the buoyancy bar is formed through through, and a bushing is provided at one corner to enable movement up and down along the buoyancy bar, and is combined with the buoyancy bar while rolling, pitching, and yawing , HEAVING, SURGING, and SWAYING are 6 degrees of freedom except for HEAVING, and the remaining 5 degrees of freedom are constrained, so that when the water level changes, it moves only in the vertical direction along the buoyancy bar. It relates to a water level control system of a floating structure comprising a;

In general, floating floating structures are called water rest areas, floating piers, barges, floating houses, floating fishing grounds, loading and unloading facilities, bridges, artificial islands, and other floating aquaculture sites that are constructed on the surface of a river, river or sea. It refers to various structures, and it performs 6 degrees of freedom movement: rolling, pitching, yawing, HEAVING, SURGING, and SWAYING. .

In order to stabilize the floating structure on the water, it is most ideal to constrain all six degrees of freedom. In the case of the conventional mooring device, since the structure is complicated and expensive installation costs are incurred, it is practical to constrain all six degrees of freedom. It was impossible.

On the other hand, there are three conventional mooring methods for floating structures: a one-point mooring method, a multi-point mooring method, and a dynamic position maintenance method.

First, the one-point mooring method is a method that is widely used for unloading petroleum, and is widely used instead of a fixed structure method, especially in deep water. The fixed structure method is characterized by low maintenance cost and high utilization rate of oil unloading operations, whereas the one-point mooring method is characterized by high maintenance costs but low initial investment in facilities.

Next, the multi-point mooring method is a mooring method for accurately maintaining an offshore structure at a predetermined position and preparing a large mooring force, and is employed in offshore work vessels and oil drilling rigs. There are several types of mooring lines arrangement. Wire ropes and chains are used for mooring lines, and intermediate sinkers or intermediate buoys are installed to stabilize mooring lines. The anchor targets horizontal force (tangent angle θ=0 at the sea floor), whereas the sinker targets horizontal force and vertical force (connection angle θ>0).

Mooring by mooring lines is limited in water depth, so even in oil excavation rigs, there are not many achievements in water depths of several hundred meters or more. In order to maintain the offshore structure in a certain position without the use of mooring lines, the dynamic positioning method is used. It detects the position of the offshore structure using a global positioning system (GPS), and calculates and operates the amount of operation of a thruster and a thruster necessary to maintain a predetermined position. The degree of dynamic position maintenance is expressed as the ratio (%) of the amount of horizontal movement to the depth of water, which is about 1% at a depth of about 100 meters. With increasing depth, this ratio also increases. In particular, in offshore structures with risers, this is limited to about 5%, and when it reaches 10%, the riser is bent and damaged, so it is necessary to carefully maintain the degree of dynamic position maintenance. The position maintenance of the offshore structure by the mooring method is applied at a depth of more than 100 meters, but it is advantageous to use the dynamic position maintenance method with an increase in the water depth.

However, most of the design and analysis of mooring devices installed and used to date have been entirely dependent on foreign technology. In fact, the design suitable for the environment of the installation area is not properly implemented, and because analysis programs for mooring devices are imported from abroad and used for analysis, a huge amount of foreign currency is being spent.

In addition, various conventional mooring devices disclosed as prior art have a problem in that a portion exposed to the water surface in a rope connecting the floating structure and the core pipe disposed on the bottom of the water is wound around the screw of the floating structure, thereby impairing safety.

In addition, when the water surface is lowered and the rope, which has become taut, becomes loose, the flow of the floating structure increases as much, and there is a problem that a defect due to shaking occurs.

And the structure fixed through the steel pipe piles had to be preceded by ground investigation, and the installation period was long and the construction cost was high due to the low construction efficiency of the pile guide.

Republic of Korea Patent Publication No. 10-2014-0126022 (Mooring device for water structures) Republic of Korea Patent Publication No. 10-2015-0109947 (Mooring device for floating structure of water solar power generation) Republic of Korea Patent Publication No. 10-1453901 (Mooring device for water structures)

The present invention was invented to solve the above problems, and the remaining five degrees of freedom except HEAVING are constrained among the six degrees of freedom of the floating floating structure, so that the floating floating structure quickly adjusts the center of buoyancy according to the change in water level. An object thereof is to provide a water level control system of a floating floating structure that can minimize the load on the mooring device by maintaining it smoothly.

For the above object, the present invention includes a rectangular main shaft which is suspended so as to be immersed in water to a predetermined depth; It is provided on each side of the main shaft, the top is open, the inside is empty, and a drain hole is formed in the bottom surface. It is filled with water when the water level is increased and inside when the water level is decreased. A buoyancy tank for maintaining the center of buoyancy of the main shaft while minimizing the influence of the water level change while the filled water is discharged to the outside through the drain hole 21; A connecting bar coupled along a horizontal direction to each corner of a pair of buoyancy tanks arranged in an orthogonal state; A buoyancy bar which is vertically coupled to connect the other end of each of the connecting bars, and is provided with a buoyancy body for providing buoyancy on a bottom surface to be suspended in the water; Includes; a plate-shaped floating floating structure in which a hole having a shape corresponding to the buoyancy bar is formed through a hole at one edge to be fitted into the buoyancy bar, and a bushing is provided in the hole to allow the floating structure to move up and down along the buoyancy bar. , The floating structure is fitted and coupled to the buoyancy bar, so 6 degrees of freedom of rolling, pitching, yawing, HEAVING, SURGING, and SWAYING Among them, 5 degrees of freedom except HEAVING are constrained so that when the water level changes, it moves only in the vertical direction along the buoyancy bar.Swaying of the floating floating structure due to environmental factors including wind, swell or waves The buoyancy bar is characterized in that it is made in the form of a square pipe to prevent ).

In addition, in the present invention, the bottom surface of the buoyancy tank is characterized in that it is formed to be inclined so as to allow smooth drainage and to prevent corrosion by residual seawater.

delete

In addition, the present invention is to ensure stability by rapidly maintaining the center of buoyancy against rapid water level changes when installed in an area where wind, swell or waves are frequent, or on a sea with a wide range of water level changes, the buoyancy tank is the outer peripheral surface of the main shaft. It characterized in that it is provided in multiple stages along the top and bottom.

The present invention made as described above can minimize the load on the mooring device due to the change in water level by restraining the remaining 5 degrees of freedom except HEAVING among the 6 degrees of freedom of the floating floating structure, through which durability and lifespan of the structure Can be significantly extended, installation costs can be significantly reduced, and manpower and costs for maintenance can be reduced.

1 is an exemplary view of a water level control system of a floating water structure according to the present invention.
Figure 2 is an exemplary view showing the coupling state of the main shaft, the buoyancy tank and the connecting bar buoyancy bar according to the present invention.
Figure 3 is an enlarged exemplary view of the bottom surface of the buoyancy tank according to the present invention.
Figure 4 is a schematic illustration showing a state of use of the present invention.
Figure 5 is a schematic illustration for explaining a buoyancy bar according to a preferred embodiment of the present invention.

Hereinafter, the water level control system of the floating water structure according to the present invention will be described in more detail with reference to the accompanying drawings.

The present invention discloses a water level control system of a floating floating structure to minimize the load of a mooring device due to a change in water level by restraining the remaining 5 degrees of freedom except HEAVING among the 6 degrees of freedom of the floating floating structure. .

For the above purposes, the present invention includes a main shaft 10, a buoyancy tank 20, a connection bar 30, a buoyancy bar 40, and a floating floating structure 50. Here, the main shaft, the buoyancy tank, the connection bar and the buoyancy bar serve as a mooring device for mooring the floating floating structure.

The main shaft 10 is a rectangular buoyant body that is suspended to be immersed in water to a predetermined depth, and a mooring line 11 and a weight 12 are provided at the lower end.

Each side of the main shaft 10 is provided with a buoyancy tank 20.

The buoyancy tank 20 has an open top so that water can be filled therein, and is formed in a "b" shape with an empty inside, but the bottom surface to discharge the water filled inside according to the change in water level In the drain hole 21 is formed.

As shown in Equation 1 above, the buoyancy force is the product of the density of the fluid (kg/m ₃ ) and the volume of the object submerged in the fluid (m ³ ) and the acceleration of gravity (m/s ² ), and the density of the fluid and the acceleration of gravity are Assuming constant, buoyancy is proportional to the volume of an object immersed in the fluid.

The main shaft 10 provided with the above buoyancy tank 20 is filled with water in the buoyancy tank 20 when the water level increases, and when the water level decreases, the water filled in the buoyancy tank 20 is drained from the drain hole 21 ), it is possible to maintain the center of buoyancy while receiving as little as possible the influence of water level changes while being discharged to the outside.

On the other hand, the buoyancy tank 20 is multi-stage up and down on each side of the main shaft 10 so that the center of buoyancy can be quickly and smoothly maintained when installed on the sea where wind, swell, or waves occur frequently, or when water level changes are wide. It may be provided in plurality. In the drawings for aiding understanding of the present invention, it is shown that three buoyancy tanks 20 are provided on the side of the main shaft 10 in multiple stages.

In addition, the buoyancy tank 20 is formed so that the water filled therein can be quickly and smoothly drained, and the bottom surface of the buoyancy tank is inclined downward from one side to the other to prevent corrosion by the remaining seawater. It is desirable to be.

The connection bar 30 is coupled along the horizontal direction to each corner of the buoyancy tank 20 arranged in an orthogonal state to each other, four connection bars are provided at 90° intervals on the same line.

The connection bar 30 may be provided in a plurality of upper and lower multi-stage corresponding to the buoyancy tank 20 provided in the upper and lower multi-stage. In the drawings for aiding understanding of the present invention, three buoyancy tanks 20 are provided on each side of the main shaft 10 in a multi-stage up and down, and the connection bar 30 is coupled to the other two places except the top. As shown, this is to ensure that no interference occurs when the floating floating structure 50, which will be described later, is fitted with the buoyancy bar, and in particular, it is to ensure the ease of work when combined at sea, and if necessary, the floating floating structure A finishing cap (not shown) for closing the upper end of the connection bar 30 may be provided to prevent separation of the 50. This configuration is only an example to aid understanding of the present invention, and is not limited to the scope of the present invention.

In addition, the connecting bar 30 is formed to have a predetermined length, and the other end is fixedly coupled with the buoyancy bar 40 so that the main shaft 10 and the floating floating structure 50 are arranged to be spaced apart by a predetermined distance. .

The shape of the connecting bar 30 is not limited to the scope of the present invention, and may be formed, for example, in the shape of a square pipe.

The buoyancy bar 40 is vertically coupled to connect the plurality of connection bars 30, is formed in a predetermined length, and a buoyancy body 41 is provided on the bottom surface to provide buoyancy so that it can be floated in the water. do.

The buoyancy bar 40 is coupled with the floating floating structure 50 via a bushing 51 to be described later to guide the vertical movement of the floating floating structure 50.

The floating floating structure 50 is a variety of water rest areas, floating piers, barges, floating houses, floating fishing grounds, loading and unloading facilities, bridges, artificial islands, and other floating aquaculture sites constructed on the surface of a river, river, or sea. The structure is collectively referred to, and in the drawings for aiding understanding of the present invention, it has been simplified into a square plate shape.

The bushing 51 is provided on one edge (an edge facing the other end of the connection bar) of the floating floating structure 50.

The bushing 51 is formed through a hole having a shape corresponding to the buoyancy bar 40, and the floating floating structure 50 is fitted with the buoyancy bar 40 through the bushing 51.

If a floating floating structure simply floats on the water surface, the floating floating structure is rolled, pitched, yawing, HEAVING, SURGING, and SWAYING. ), all six degrees of freedom are in an unbound state, so a considerable load is applied to the mooring system when the water level changes.

However, when the floating floating structure 50 is fitted with the buoyancy bar 40 through the bushing 51, rolling, pitching, yawing, and HEAVING The remaining 5 degrees of freedom except HEAVING among the six degrees of freedom of, SURGING, and SWAYING are restricted.

Therefore, the floating floating structure 50 as shown in FIG. 4 moves only in the vertical direction along the buoyancy bar when the water level changes, so it is possible to significantly extend the durability and life of the entire facility by minimizing the load on the mooring device. Compared to restricting 5 degrees of freedom through the device, the installation cost can be significantly reduced, and maintenance is easy.

Next, as shown in Fig. 5a), when the buoyancy bar 40 ′ is formed in a circular pipe shape, the floating floating structure is formed in an area where the water level changes rapidly or in an area where wind, swell or waves are frequently generated. It may be affected by swaying, and this may cause a problem that the load of the mooring device increases and the durability decreases.

In order to prevent this problem, the buoyancy bar 40 may be formed in a square pipe shape as shown in FIG. 5B, and the hole of the bushing 51 is formed in a square shape corresponding to the buoyancy bar 40. desirable.

In addition, although not shown in the drawing, a pair of bushings 51 are provided on a pair of corners facing each other in a diagonal direction of the floating water structure, and the main shaft, the connecting bar, and the buoyancy bar shown in FIG. 2 are mutually combined. A pair of mooring devices configured are combined with the bushings at each corner, so that the floating floating structure can more completely restrain SWAYING and minimize the load on the mooring device.

In the present invention as described above, the buoyancy center of the main shaft is kept constant as the buoyancy tank provided on the side of the main shaft is filled with water or the water filled in the buoyancy tank is drained according to the water level change, and the main shaft and the connecting bar And the floating floating structure coupled through the buoyancy bar as a medium of 5 degrees of freedom, except for HEAVING, is restricted and moves only up and down along the buoyancy bar when the water level changes. , Connection bar and buoyancy bar) has the advantage of minimizing the load to significantly extend the durability and life of floating floating water structures and mooring devices.

10: main shaft
11: mooring line 12: weight
20: buoyancy tank 21: drain hole
30: connecting bar
40: buoyancy bar 41: buoyancy body
50: floating floating structure 51: bushing

Claims (4)

A rectangular main shaft 10 that is suspended so as to be immersed in water to a predetermined depth;
It is provided on each side of the main shaft, the top is open, the inside is empty, and a drain hole is formed in the bottom surface. It is filled with water when the water level is increased and inside when the water level is decreased. A buoyancy tank 20 for maintaining the center of buoyancy of the main shaft while minimizing the influence of the water level change while the filled water is discharged to the outside through the drain hole 21;
A connecting bar 30 coupled along a horizontal direction to each corner of a pair of buoyancy tanks arranged in an orthogonal state;
A buoyancy bar 40 which is vertically coupled to connect the other end of each of the connecting bars, and is provided with a buoyancy body 41 for providing buoyancy on a bottom surface to be suspended in the water;
Includes; a plate-shaped floating floating structure 50 through which a hole having a shape corresponding to the buoyancy bar is formed at one corner to be fitted and coupled to the buoyancy bar,
The hole is provided with a bushing 51 that allows the floating structure to move up and down along the buoyancy bar, and the floating structure is fitted and coupled to the buoyancy bar so as to roll, pitch, and yawing. , HEAVING, SURGING, and SWAYING are the remaining 5 degrees of freedom except for HEAVING, so that when the water level changes, it moves only up and down along the buoyancy bar. ,
The buoyancy bar is a water level control system of a floating structure, characterized in that to prevent swaying (SWAYING) of the floating floating structure by environmental factors including wind, swell or waves.
The water level control system of claim 1, wherein the bottom surface of the buoyancy tank is formed to be inclined to allow smooth drainage and to prevent corrosion due to residual seawater.
delete The buoyancy tank according to claim 1, wherein the buoyancy tank is formed of the main shaft to ensure stability by rapidly maintaining the center of buoyancy against sudden changes in water level when installed in an area where wind, swell or waves are frequent, or on a sea with a wide range of water level changes. Water level control system of a floating floating structure, characterized in that provided in a multi-stage up and down along the outer circumferential surface.

Images