KR102155719B1 - Floating Unit with Stress Distribution Structure - Google Patents

Abstract

A floating unit having a stress distribution structure, comprising: a horizontal member having a cut surface cut by a predetermined length in a length direction and a width direction, a vertical member having a cut surface cut by a predetermined length in the length direction and the width direction, the horizontal member and the vertical When designing or manufacturing offshore structures by fixing the connecting part between the horizontal and vertical members with a finishing plate by providing a finishing plate that is finished in an arc shape between the cut surfaces of the members to distribute the stress applied to the horizontal and vertical members. It is possible to flexibly cope with frequently occurring design changes, and because the horizontal member and the horizontal member are not manufactured by casting, the cost can be significantly reduced.

Description

Floating Unit with Stress Distribution Structure

The present invention relates to a floating unit having a stress distribution structure, and more particularly, to a floating unit having a stress distribution structure capable of dispersing the stress of the connection portion of the pontoon, column, deck box and column of an offshore structure. .

In general, offshore structures are structures that are installed on the sea or on the sea floor, and are classified into fixed, semi-submersible, and floating types according to the depth of water, and are mainly used for offshore work such as exploration and extraction of energy sources such as oil and natural gas. .

Among these offshore structures, the semi-submersible structure is a facility that complements the shortcomings of the jack-up rig and improves working conditions in deep water and at sea, and a number of pontoons are used to secure displacement. It is located below this and is used to develop a submarine oil field by mounting drilling equipment, for example.

A pontoon structure applied to a conventional semi-submersible structure will be described with reference to the accompanying drawings.

1 is a three-dimensional view showing a pontoon of a semi-submersible structure according to the prior art.

As shown in Fig. 1, the pontoon 10 of a semi-submersible structure according to the prior art has a rectangular parallelepiped shape in order to secure the displacement of the semi-submersible structure, and is located in the fore and aft direction, and a plurality of them are arranged to be parallel to the connection part ( They are connected to each other by 11), and a column 12 for supporting the upper structure is provided on the upper surface.

The pontoon 10 of such a conventional semi-submersible structure is configured to load equipment and cargo necessary for position control, drilling, operation, etc. of a drilling vessel such as a thruster room, a ballast tank, a fuel tank, and a drill water. It has a linear shape.

In such a conventional semi-submersible structure, a have motion in the vertical direction has a great influence on the design of a riser tensioner and a motion displacement compensator in the vertical direction. The vertical motion of the semi-submersible structure should not exceed the allowable displacement provided by the riser tensioner or the active/passive compensator, and not only the excessive vertical motion, but also the pontoon 10 and the connection part 11 ), stress is intensively generated in the connection portion between the pontoon 10 and the column 12.

As the stress is concentrated in the pontoons 10 and the connecting parts 11, the pontoons 10 and the columns 12, and the columns and deck boxes (not shown), which are the connecting parts of the floating unit, casting is performed. Each component (pontoon, connection, column, etc.) is manufactured using the structure.

When connecting parts such as pontoons, columns, and deck boxes of these floating units are made of steel plates, these parts are manufactured by casting with excellent fatigue and strength because the design criteria are not satisfied in terms of fatigue and strength. .

However, in the case of manufacturing by casting, a long manufacturing period of approximately 3 months or more is required, and due to the long manufacturing period, it is necessary to make orders in advance, cannot flexibly cope with frequent design changes, and the quality of parts manufactured by casting. In addition to being difficult to inspect, there is a problem in that it is impossible to re-manufacture or cope with the manufacturing defects of these parts.

As shown in FIGS. 2 and 3, stress is concentrated in the connection portion between the pontoon 10 and the column 12 of the floating unit according to a load or motion displacement. That is, as shown in Figs. 2 and 3, stress is not dispersed in the corner (patent vertex) of the horizontal member and the vertical member, and excessive stress is generated.

For example, the following Patent Document 1 discloses a'stress concentration relief additional structure at the edge of a steel structure of a ship'.

In the additional structure to relieve stress concentration at the edge of a steel structure of a ship according to Patent Document 1 below, a horizontal girder is an additional structure for mitigating the stress concentration at the edge of a steel structure where a pillar or vertical girder of a ship and a horizontal girder meet. And pillars, and horizontal girders and vertical girders are each vertically connected, and when a bracket is installed as a reinforcing material between the horizontal girders and pillars, or when a round part is formed between the horizontal girders and vertical girders, the length of the horizontal girders An additional structure and an additional structure are installed at an arbitrary point in L, another additional structure is installed in the pillar at a position corresponding to the additional structure installed in the horizontal girder, and a position corresponding to the additional structure installed in the horizontal girder in the vertical girder Additional structures are disclosed.

The following Patent Document 2 discloses a'lower hopper structure of a ship'.

In the lower hopper structure of the ship according to Patent Document 2 below, the first knuckle part and the second knuckle part are arranged between the inner bottom plate and the inner side plate, and the first knuckle part and the second knuckle part are inclined to be different from each other. It is fixed to protrude toward the inside of the ballast tank.

Korean Patent Publication No. 10-2013-0002715 (published on January 8, 2013) Korean Patent Publication No. 10-2010-0034841 (published on April 2, 2010)

However, the stress concentration relief additional structure at the edge of a ship's steel structure according to the prior art can distribute the concentration of stress by adding a round-shaped additive between the horizontal girder and the vertical girder, but it is possible to disperse the concentration of the stress at the connection part of the floating unit manufactured by casting. It is difficult to apply, and there is a problem in that it cannot flexibly cope with frequent design changes.

In addition, the lower hopper structure of the ship according to the prior art is to fix the first knuckle part and the second knuckle part at different inclinations, and cannot be applied to parts manufactured by casting such as connecting parts such as pontoons and columns, and is often designed. There was a problem in not being able to respond flexibly to changes.

An object of the present invention is to solve the above-described problems, and to provide a floating unit having a stress distribution structure capable of distributing stress to surrounding members by removing a region where stress is concentrated.

Another object of the present invention is to provide a floating unit having a stress distribution structure for dispersing stress by forming a connection portion of the floating unit in a round shape.

In order to achieve the above object, the floating unit having a stress distribution structure according to the present invention is a horizontal member having a cut surface cut by a predetermined length in the length direction and the width direction, and cut by a predetermined length in the length direction and the width direction. It characterized in that it comprises a vertical member having a cut surface, a finishing plate that is finished in an arc shape between the cut surfaces of the horizontal member and the vertical member to distribute the stress applied to the horizontal member and the vertical member.

The length of the arc of the closing plate is characterized in that it is formed in a length of 1.5 to 3 times the length of the cut surface.

The finishing plate includes an arc plate formed in an arc shape, a side plate having the same arc as the arc plate and finished in the same manner as the cut surfaces of the horizontal and vertical members, and a side plate finished on the cut surfaces of the horizontal and vertical members. It characterized in that it includes.

The closing plate is characterized in that it is formed in an L-shape.

The finishing plate is characterized in that it is formed in a spherical shape.

As described above, according to the floating unit having the stress distribution structure according to the present invention, by fixing the connection portion between the horizontal member and the vertical member with a finishing plate, it is flexible to design changes that occur frequently during design or manufacture of offshore structures. It is possible to cope with, and since the horizontal member and the horizontal member are not manufactured by casting, the effect of significantly reducing the cost is obtained.

In addition, according to the floating unit having a stress distribution structure according to the present invention, it is possible to lower the stress level of the horizontal member and the vertical member, thereby increasing the overall stability of the offshore structure, and It has the effect that it is easy to inspect the quality when inspecting the connection part, and that reinforcement can be facilitated when reinforcement due to stress or defects are found.

1 is a three-dimensional view showing a conventional pontoon,
2 is a stress distribution diagram acting on a conventional pontoon,
3 is an enlarged view of the distribution of stress acting on a conventional pontoon,
4 is an exploded three-dimensional view showing a floating unit having a stress distribution structure according to a preferred embodiment of the present invention,
5 is a partially cut-out three-dimensional view showing a cut-away cross section of a floating unit having a stress distribution structure according to a preferred embodiment of the present invention;
6 is a partially cut-out three-dimensional view showing a floating unit having a stress distribution structure according to another preferred embodiment of the present invention,
7 is a stress distribution diagram of a floating unit according to a preferred embodiment of the present invention.

Hereinafter, a floating unit having a stress distribution structure according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is an exploded three-dimensional view showing a floating unit having a stress distribution structure according to a preferred embodiment of the present invention, and FIG. 5 is a partial cross-sectional view of a floating unit having a stress distribution structure according to a preferred embodiment of the present invention. It is a cut-out three-dimensional view.

The floating unit having a stress distribution structure according to a preferred embodiment of the present invention includes a horizontal member 30 having a cutting surface 31 cut by a predetermined length in the length direction and the width direction, and a horizontal member 30 cut by a predetermined length in the height direction and the width direction. The vertical member 40 having a cut surface 41, the horizontal member 30 and the vertical member 40 are closed in an arc shape between the cut surfaces 31 and 41 to distribute the stress applied to the horizontal member and the vertical member It includes a finishing plate (50).

As shown in FIGS. 4 and 5, the floating unit having a stress distribution structure according to an embodiment of the present invention is applied to a pontoon, column, deck box, etc. having a predetermined length.

This floating unit assembles pontoons, columns, deck boxes, etc., and is an offshore structure in which equipment and cargo necessary for drilling, operation, etc. of drilling vessels such as thrust room, ballast tank, fuel tank, and drill water are loaded. It is used as a structure to support it.

Meanwhile, in the present invention, the horizontal member 30 refers to a member that is horizontally fixed, such as a pontoon, a connection part (see 11 in FIG. 1), and a deck box, and the vertical member 40 refers to a member that is vertically fixed such as a column.

That is, the horizontal member 30 is to be understood as a generic term for a member assembled in the horizontal direction, and the vertical member 40 is a generic term for a member assembled in the vertical direction.

The horizontal member 30 is formed with a cut surface 31 having a predetermined length and width in a length direction and a width direction at a connection portion with the vertical member 40.

The cut surface 31 is formed on each of the horizontal member 30 and the vertical member 40 and is cut by a predetermined length in the length direction and the width direction of the horizontal member 30. That is, as shown in FIGS. 4 and 5, the horizontal member 30 is cut by a predetermined length in the longitudinal direction and cut from both sides by a predetermined length in the width direction.

At this time, the cutting length in the longitudinal direction and the cutting length in the width direction are formed differently, and the cutting length in the longitudinal direction is cut longer than the cutting length in the width direction.

In addition, the vertical member 40 is formed with a cut surface 41 having a predetermined height and width in the height direction and the width direction at a connection portion with the horizontal member 30. The cut surface 41 is formed in the same manner as the cut surface 31 of the horizontal member 30 and is cut by a predetermined length in the height direction and the width direction of the vertical member 40.

That is, it is formed in the same shape and length as the cut surface 31 of the horizontal member 30, and the cut surface 31 of the horizontal member 30 and the cut surface 41 of the vertical member 40 cross each other at a right angle. Is formed in the position.

In addition, when these cut surfaces 31 and 41 face each other, arc surfaces 32 and 42 are formed so that the two cut surfaces 31 and 41 can be connected to each other by a single arc.

That is, an arc surface 32 having a predetermined diameter is formed on the cut surface 31 of the horizontal member 30 and the horizontal surface of the horizontal member 30.

The cut surface 31 of the horizontal member 30 and the cut surface 41 of the vertical member 40 are each formed with an arc surface 42 having a predetermined diameter, and these arc surfaces 32 and 42 have one diameter. Formed arc.

That is, the arc surfaces 32 and 42 are one at the center point, which is the point where the virtual vertical line extending from the cut surface 31 of the horizontal member 30 and the virtual horizontal line extending from the cut surface 41 of the horizontal member 40 meet. It is formed in an arc shape.

It goes without saying that the arcs of these arc surfaces 32 and 42 may be formed to have a length of 1.5 to 3 times the length of the cut surfaces 31 and 41, and may vary as necessary.

The finishing plate 50 is to finish the cutting surface 31 and the arc surface 32 of the horizontal member 30 and the cutting surface 41 and the arc surface 42 of the vertical member 40, the cutting surface (31, 41) ) And the arc surface (32, 42) is closed.

The finishing plate 50 is vertical to the cutting surface 31 of the horizontal member 30 and the arc plate 51 covering the arc surface 32 of the horizontal member 30 and the arc surface 42 of the vertical member 40 A side plate 52 formed to correspond to the cut surface 41 and the arc surfaces 32 and 42 of the member 40, and a side plate 53 covering the cut surfaces 31 and 41, respectively.

That is, the arc plate 51 is made in an arc shape so as to correspond to the arc surfaces 32 and 42 of the horizontal member 30 and the vertical member 40, and the arc plate 51 is cut from the horizontal member 30. It is made in a plate shape having a width and a length of the cut width of the vertical member 40.

In addition, one side of the side plate 52 is formed in an arc shape corresponding to the arc plate 51, and the other side of the side plate 52 is a cut surface 31 of the horizontal member 30 and a cut surface of the vertical member 40 ( 41).

In addition, the side plate 53 is made of two, consisting of a side plate fixed between the horizontal surface of the horizontal member 30 and the arc plate 51 and the side plate fixed between the vertical surface of the vertical member 40 and the arc plate 51 do.

The finishing plate 50 is a horizontal member 30 by maintaining the cut surface 31 and the arc surface 32 of the horizontal member 30 and the cut surface 41 and the arc surface 42 of the vertical member 40 in an arc shape. ) And the stress concentrated in the connection portion between the vertical member 40 and the vertical member 40 are dispersed.

Accordingly, since the stress is concentrated at the connecting portion and both ends in the width direction, the stress applied to the connecting portion of the horizontal member 30 and the vertical member 40 is dispersed by the arc plate 51 of the closing plate 50.

In such a finishing plate 50, the connection portion between the horizontal member 30 and the vertical member 40 is formed in an approximately'L' shape by the arc plate 51, and stress is caused by the arc plate 51 It distracts you.

6 is a partially cut-out three-dimensional view showing a floating unit having a stress distribution structure according to another exemplary embodiment of the present invention.

6, the floating unit according to another embodiment of the present invention has the same cut surface 31 of the horizontal member 30 and the cut surface 41 of the vertical member 40, and the finishing plate 50 ) Is characterized by being formed in a spherical shape.

The cut surface 31 of the horizontal member 30 is cut in an arc shape, and the cut surface 41 of the vertical member 40 is also cut in an arc shape. Further, the arc surface 32 of the horizontal member 30 and the arc surface 42 of the vertical member 40 are formed in an arc shape having one diameter.

The finishing plate 50 is an arc sphere 55 corresponding to the arc surface 32, 42 and a cutting surface sphere 56 corresponding to the cutting surface 31 of the horizontal member 30 and the cutting surface of the vertical member 40 ( It may include a cross-section sphere 56 corresponding to 41).

The cut spheres 56 are made of two of the cut spheres 55 of the horizontal member 30 and the cut spheres 56 of the vertical member 40, and these cut spheres 56 have a shape having the same arc. Therefore, it will be described as one configuration without distinction.

Next, a coupling relationship between a floating unit having a stress distribution structure according to a preferred embodiment of the present invention will be described in detail.

As shown in FIGS. 4 to 5, the floating unit of the present invention includes a pontoon (10, see FIG. 1), a connection part 11 (see FIG. 1), a column 12 (see FIG. 1), and a deck supported on the upper surface of the column. It is made of a box (not shown).

The pontoon 10, the connection part 11, the horizontal member 30 such as a deck box, a cut surface 31 is formed at a point where the vertical member 40 is located, with a predetermined length, and an arc surface 32 with this To form.

The cutting surface 31 is cut by a predetermined length in the longitudinal direction and also by a predetermined length in the width direction of the horizontal member 30.

On the bottom of the vertical member 40, a cut surface 41 and an arc surface 42 are formed in the same size as the cut surface 31 and the arc surface 32 of the horizontal member 30, and at this time, the cut surface 41 and the circle The arc surface 42 is formed to have the same size as the cut surface 31 and the arc surface 32 of the horizontal member 30.

These cut surfaces 31 and 41 and arc surfaces 32 and 42 are formed in a size capable of distributing the load applied to the horizontal member 30 and the vertical member 40 according to design conditions.

Meanwhile, the cut surfaces 31 and 41 and the arc surfaces 32 and 42 may be cut to a larger size than the cut surfaces 31 and 41 and the arc surfaces 32 and 42 previously cut according to design conditions. That is, when the load applied to the horizontal member 30 and the vertical member 40 is increased according to the design change, the cut surfaces 31 and 41 and the arc surfaces 32 and 42 are used to appropriately distribute the stress caused by the load. Can be cut additionally to expand a larger size.

In addition, a finishing plate 50 for closing the cut surfaces 31 and 41 and the arc surfaces 32 and 42 of the horizontal member 30 and the vertical member 40 is provided.

The finishing plate 50 includes an arc plate 51 fixed to the arc surfaces 32 and 42, a side plate 52 fixed to the side of the cut surfaces 31 and 41, and a side plate fixed to the cut surfaces 32 and 42 ( 53).

This finishing plate 50 may be changed to suit the size of the cut surfaces 31 and 41 and the arc surfaces 32 and 42 changed according to the design change. That is, when the cutting surfaces 31 and 41 and the arc surfaces 32 and 42 are changed, it is possible to immediately manufacture different sizes to suit these sizes.

The finishing plate 50 is integrally fixed to the cut surfaces 31 and 41 and the arc surfaces 32 and 42 by welding or the like.

Meanwhile, the present invention distributes the load applied to the horizontal member 30 and the vertical member 40 by the closing plate 50 so that the stress is not concentrated, the horizontal member 30 and the vertical member 40 and the closing plate ( All 50) can be made of steel plate.

Accordingly, it is possible to reduce the manufacturing cost of the horizontal member 30 and the vertical member 40 by casting, as well as easily satisfy the conditions according to the design change.

As shown in Figure 6, the horizontal member 30 and the end plate 50 fixed to the vertical member 40 is an arc sphere 55 and the cut surface (31, 41) corresponding to the arc surface (32, 42) It may be made of a cut surface sphere 56 corresponding to each.

An arc sphere (55) having a relatively large size compared to the cut surface sphere (56) is fixed to the arc surfaces (32, 42), and the cut surface sphere (small size) compared to the arc sphere (55) is fixed to the cut surfaces (31, 41). 56).

These spheres may be made of one sphere that integrally surrounds the cut surfaces 31 and 41 and the arc surfaces 32 and 42.

Next, a method of operating a floating unit having a stress distribution structure according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 4 to 7.

As shown in Figures 4 to 7, the floating unit according to the present invention is a predetermined length in the length direction and the width direction of these members (30, 40) among the connecting portions of the horizontal member (30) and the vertical member (40). After cutting, the finishing plate 50 is fixed to the connection part by welding.

In this way, the horizontal member 30 and the vertical member 40 are connected to each other by fixing the arc plate 51 or the end plate 50 made of spheres 55, 56 to the apex (or intersection). The stress is distributed by the arc plate 51 or spheres 55, 56 of the finish plate 50.

As shown in FIG. 7, a strong load is applied to the vertex where the horizontal member 30 and the vertical member 40 meet, but the stress of the arc plate 51 or spheres 55 and 56 having an arc shape Disperse along the surface.

When comparing the stress distribution of FIGS. 3 and 7, the stress according to the load is concentrated at the vertex of the conventional floating unit, but the stress according to the load is at the vertex of the floating unit to which the finishing plate 50 is fixed. It is distributed long along ).

Although the invention made by the present inventor has been described in detail according to the above embodiment, the invention is not limited to the above embodiment, and it goes without saying that the invention can be changed in various ways without departing from the gist.

30: horizontal member 31: cut surface
32: arc surface 40: vertical member
41: cut surface 42: arc surface
50: finishing plate 51: arc plate
52: side plate 53: side plate
55: circular sphere 56: cut sphere

Claims (5)

A horizontal member having a cut surface cut by a certain length in the length direction and the width direction,
A vertical member having a cut surface cut by a certain length in the height direction and the width direction,
A floating unit having a stress distribution structure, characterized in that it comprises a finishing plate finished in an arc shape between the cut surfaces of the horizontal member and the vertical member to distribute the stress applied to the horizontal member and the vertical member. The method of claim 1,
A floating unit having a stress distribution structure, characterized in that the arc length of the finishing plate is formed to be 1.5 to 3 times the length of the cut surface. The method of claim 1,
The finishing plate is an arc plate formed in an arc shape,
A side plate having the same arc as the arc plate and finished in the same manner as the cut surfaces of the horizontal member and the vertical member,
Floating unit having a stress distribution structure, characterized in that it comprises a side plate finished on the cut surface of the horizontal member and the vertical member. The method of claim 1,
The closing plate is a floating unit having a stress distribution structure, characterized in that formed in an L-shape. The method of claim 1,
The finishing plate is a floating unit having a stress distribution structure, characterized in that formed in a spherical shape.

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