KR101792846B1 - Leg of floating structure - Google Patents

Leg of floating structure Download PDF

Info

Publication number
KR101792846B1
KR101792846B1 KR1020150108001A KR20150108001A KR101792846B1 KR 101792846 B1 KR101792846 B1 KR 101792846B1 KR 1020150108001 A KR1020150108001 A KR 1020150108001A KR 20150108001 A KR20150108001 A KR 20150108001A KR 101792846 B1 KR101792846 B1 KR 101792846B1
Authority
KR
South Korea
Prior art keywords
rack
plate
code member
cord
leg
Prior art date
Application number
KR1020150108001A
Other languages
Korean (ko)
Other versions
KR20170014503A (en
Inventor
박주신
조태민
장기복
Original Assignee
삼성중공업 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성중공업 주식회사 filed Critical 삼성중공업 주식회사
Priority to KR1020150108001A priority Critical patent/KR101792846B1/en
Publication of KR20170014503A publication Critical patent/KR20170014503A/en
Application granted granted Critical
Publication of KR101792846B1 publication Critical patent/KR101792846B1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/003—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for for transporting very large loads, e.g. offshore structure modules
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
    • E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
    • E02B17/0818—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with racks actuated by pinions

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Architecture (AREA)
  • Supports For Pipes And Cables (AREA)

Abstract

The present invention relates to a leg of a floating structure. Specifically, according to an embodiment of the present invention, there is provided a leg which is installed in a floating structure and selectively fixes the floating structure to a seabed, comprising: a plurality of chords; And a brace for connecting the cords to each other, wherein the cord comprises: a first cord member constituting one surface; A second code member constituting the other surface; A first rack and a second rack provided between the first code member and the second code member and joined to the first code member and the second code member; And a first plate and a second plate connecting the first rack and the second rack to each other.

Description

LEG OF FLOATING STRUCTURE < RTI ID = 0.0 >

The present invention relates to a leg of a floating structure.

In recent years, various floating structures have been developed. Among them, floating structures are being developed, which have a self-propelled ability to move to a specific position, and lift the hull from the sea to carry out a predetermined operation.

For example, a floating structure such as a jack-up drilling rig, a wind turbine installation vessel (WTIV), a mobile offshore drilling unit (MODU) And a plurality of legs that are installed as far as possible. Such a floating structure can be moved to a specific position in the sea, lowering the legs, fixing the hull, and then shifting to the working state by lifting the hull along the legs.

In such a floating structure, the leg is provided so as to penetrate the hull in the vertical direction, and a predetermined structure such as a jack house for fixing the leg to the hull and lifting the hull along the leg is provided.

Such a floating structure may include three to six legs, each of which may comprise a cord extending in a vertical direction and a brace connecting the cords in a truss shape. Such a cord may have a pipe shape as a whole, and includes a rack 140 protruding laterally through the central portion in the radial direction as shown in Fig.

In recent years, it is demanded that such a floating structure can be operated in a more severe environment. If the working environment becomes severe, the load on the leg of the floating structure is inevitably increased.

In order to allow the legs to withstand a sufficient load, it is required to enlarge the cords of the legs or increase the size of the racks of the legs. However, it is difficult to bend the extremely thick plates after preheating the cords of the legs, It has been recognized that it is necessary to increase the rack size in order to enlarge the leg.

However, for existing legs, racks were already available in extra large plates (1500 mm x 250 mm cross-section), making it easier to manufacture larger racks and providing larger racks than existing racks There is a problem that it takes a great deal of time and cost to manufacture.

In addition to the above-mentioned problems, existing legs have a problem that stress is excessively concentrated on the rack gear of the cord. Such a rack gear is a key structure in moving the legs up and down, and it is difficult to maintain the rack gear. Therefore, conventionally, in anticipation of an excessive concentration of stress in the rack gear, Strength.

There is a problem that disturbance or interference may occur between the respective subsidiary structures because a stable space for discharging these subsidiary structures is not sufficiently provided in disposing a subsidiary structure such as a pipeline pipeline or electric wiring therein.

The embodiments of the present invention have been made to solve the above-mentioned problems, and it is an object of the present invention to provide a structure of a leg including a smaller-sized rack.

It is also intended to provide a leg of a floating structure with reduced time and cost of manufacture.

It is also intended to provide a structure of the leg which can relieve the concentration of stress in the rack gear.

In addition, it is desirable to provide a leg which can more stably include a structure such as a piping pipeline inside.

According to an aspect of the invention, there is provided a leg which is installed in a floating structure and selectively fixes the floating structure to the seabed, comprising: a plurality of chords; And a brace connecting the cords to each other, the cords including: a first code member; A second code member disposed opposite the first code member; A first rack and a second rack provided between the first code member and the second code member and joined to the first code member and the second code member; And legs of a floating structure including a first plate and a second plate connecting the first rack and the second rack to each other.

 Further, the first rack, the second rack, the first plate and the second plate may be provided with legs of a floating structure that divides the internal space of the cord into a first space, a second space, and a third space .

The first plate is connected to the first code member side surface of the first rack and the second rack, and the second plate is connected to the second code member side surface of the first rack and the second rack A leg of the floating structure may be provided.

Further, the first plate may be provided to abut the inner surface of the first code member, and the second plate may be provided to abut the inner surface of the second code member.

Also, the first plate may be provided to be spaced from the inner side of the first cord member, and the second plate may be provided to be spaced from the inner side of the second cord member.

Further, the first plate and the second plate may be formed such that one end is connected to the opposed surface of the first rack to the second rack, and the other end is connected to the opposed surface of the second rack to the first rack Legs of the floating structure may be provided.

Also included is a leg of the floating structure, comprising: a hull; A spud can attached to the lower end of the leg of the floating structure; And a guide rail installed on the hull can be provided.

According to the embodiment of the present invention, the size of the leg can be increased.

Further, there is an effect that it is possible to reduce the time and cost in manufacturing the legs.

In addition, when a load is applied to the rack, there is an effect that the stress concentrated on the rack gear can be dispersed.

In addition, there is an advantage in that a subsidiary structure such as a pipe pipe and a wire can be stably disposed inside the leg.

1 is a conceptual view showing a floating structure including legs according to an embodiment of the present invention.
Fig. 2 is a view showing a part of the leg structure of Fig. 1. Fig.
3 is a cross-sectional view of a cord according to the first embodiment;
4 is a cross-sectional view of a cord according to a second embodiment;
5 is a cross-sectional view of a cord according to a third embodiment;
6 is a cross-sectional view of a cord according to the prior art;
7 is a result of stress simulation for the cord according to the embodiment of FIG.
8 is a result of stress simulation for a cord according to the prior art.

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

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a view showing a floating structure in which legs according to an embodiment of the present invention are fixed to a sea floor through legs. FIG.

1, a floating structure 1 according to an embodiment of the present invention includes a main body 10 having floating performance and a plurality of legs 20 installed to penetrate the main body 10 in the up and down direction .

In this embodiment, the floating structure 1 may be a wind turbine installation vessel (WTIV) for installing a wind turbine at sea, a mobile drill ship (MODU), or otherwise, It may be any floating structure. In addition, the floating structure 1 may be a floating structure that is not movable and fixedly installed at a specific point. In this embodiment, the legs 20 are illustrated as being passed through the main body 10, but this is only an example, and the spirit of the present invention is not limited to the case where the legs 20 are movable in the vertical direction of the main body 10 It can be applied to all floating structures provided.

In this embodiment, the floating structure 1 may be a wind turbine installation vessel (WTIV) for installing a wind turbine at sea, a mobile drill ship (MODU), or otherwise, It may be any floating structure. In addition, the floating structure 1 may be a floating structure that is not movable and fixedly installed at a specific point.

The legs 20 can move up and down along the main body 10. More specifically, the legs 20 and the main body 10 perform relative motion in the up and down directions. When the main body 10 is floating in the sea, the legs 20 are moved in the vertical direction, The main body 10 can be moved up and down along the legs 20 in a state where the main body 10 is fixed to the seabed. To this end, the main body 10 may be provided with a hole (not shown) penetrating in the vertical direction so that the legs 20 can be installed.

In addition, the floating structure 1 may include a driving device (not shown) that supports the legs 20 and can move the legs 20 in the vertical direction. At this time, racks 141 and 142 extending in the moving direction of the legs 20 are engaged with the pinions provided in the driving device so that the driving force of the driving device is transmitted to the racks 141 and 142, 20 can be moved.

To this end, the legs 20 may include racks 141, 142 on which teeth are formed.

The legs 20 may be moved downwardly of the main body 10 and fixed to the seabed. A plurality of legs 20 may be provided to support the load of the main body 10. [

The floating structure 1 can move in a state in which the legs 20 are moved upward so as not to interfere with the operation and move the legs 20 downward when the position is different from the target position, And can be fixed to the seabed (B). Thereafter, the main body 10 can be moved up and down along the legs 20.

The main body 10 moves upward along the legs 20 and then is fixed in a state spaced apart from the sea surface S and performs a predetermined operation while being spaced apart from the sea surface S and fixed .

Hereinafter, a concrete configuration of the cord 100 included in the leg 20 will be described with reference to Figs. 2 and 3. Fig. Fig. 2 is a view showing a part of the leg structure of Fig. 1, and Fig. 3 is a cross-sectional view of the cord 100 of the leg of Fig. 2, which is perpendicular to the moving direction of the leg 20 Lt; RTI ID = 0.0 > 100 < / RTI >

2, the leg 20 according to an embodiment of the present invention includes a cord 100 and a plurality of braces 21, and the plurality of braces 21 are welded to the circumference of the cord 100 And may be connected to form a truss structure with respect to the cord 100.

In this embodiment, three codes 100 are provided for one leg 20, but this is merely an example, and four or more codes 100 may be provided for one leg 20, May be provided.

3, the cord 100 of the leg 20 includes cord members 110 and 120, racks 141 and 142, and plates 161 and 162. The code member includes a first code member 110 and a second code member 120 and the rack includes a first rack 141 and a second rack 142 having a first plate 161 and a second plate 142, And a second plate 162. The first code member 110 constitutes one side of the cord and the second code member 120 constitutes the other side of the cord and the first rack 141 and the second rack 142 constitute one side of the cord. May be provided between the member (110) and the second code member (120).

The end portions 111 and 112 of the first code member 110 and the end portions 121 and 122 of the second code member 120 are opposed to each other. The first rack 141 has the first code member 110 And the second rack 142 is provided between the other end 112 of the first cord member 110 and the other end 112 of the second cord member 120. The second cord 142 is provided between one end 111 of the first cord member 110 and one end 121 of the second cord member 120, May be provided between the other end 122 of the member 120.

In addition, the first plate 161 and the second plate 162 are provided in the inner space of the cord 100. The first plate 161 is coupled to the first rack 141 and the second rack 142 and the second plate 162 is coupled to the first rack 141 and the second rack 142, The first plate 161 and the second plate 162 may be arranged in parallel within the inner space of the cord 100. For example, the first plate 161 may face the inner surface of the first cord member 110, and the second plate 162 may be arranged to face the inner surface of the second cord member 120.

One end of the first plate 161 is connected to the opposing face of the first rack 141 to the second rack 142 and the other end of the first plate 161 is connected to the end of the second rack 142 And may be connected to the facing surface of the first rack 141.

3, the inner space of the cord 100 may be divided into three spaces according to the arrangement of the racks 141 and 142 and the plates 161 and 162 as described above. The first space 171 is a space between the first code member 110 and the first plate 161 and the second space 172 is a space between the second code member 120 and the second plate 162. [ And the third space 173 corresponds to a space between the first plate 161 and the second plate 162.

Next, a method of manufacturing the rack 20 including the cord 100 according to the present invention will be described with reference to FIG. A first rack 141 and a second rack 142 including rack gears are provided on one side and the first rack 161 and the second rack 162 are combined with the first rack and the second rack . Thereafter, one end of the first code member 110 is coupled to the upper surface of the first rack 141, and the other end of the first code member 110 is coupled to the upper surface of the second rack 142. One end of the second code member 120 is coupled to the lower surface of the second rack 142 and the other end of the second code member 120 is coupled to the lower surface of the second rack 142 in the same manner.

Hereinafter, the action and effect of the leg 20 including the cord 100 having the above-described structure will be described with reference to Figs. 7 and 8. Fig. FIG. 7 shows a stress simulation result for a code according to an embodiment of the present invention, and FIG. 8 shows a stress simulation result for a code according to the related art. This simulation result shows the stress distribution when a load of 1000 tons is applied in the X direction (the direction in which the rack passes through both sides in the radial direction of the cord as viewed from the cross section of the cord) in Figs. 7 and 8 .

7 and 8, a cord according to the prior art concentrates stress on both sides of a rack provided with a rack gear (see Fig. 8), whereas the cord according to the present embodiment is provided with a rack gear It can be seen that no stress is concentrated on both sides of the rack, and stress is distributed throughout the member (see FIG. 7). Accordingly, the stress applied to the rack gear of the leg according to the present embodiment is reduced as compared with the conventional leg structure, thereby reducing the risk of breakage of the rack gear and extending the service life of the rack gear.

1) when a load of 1000 tons is applied in the X direction, 2) when a load of 1000 tons is applied in the Y direction, and 3) when a load of 1000 tons in the Z direction is applied The maximum von-Mises stress (MPa) was 1) 196 MPa, 2) 261 MPa and 3) 207 MPa, respectively. In general, considering that the critical stress for the material used in the cord is generally about 700 MPa, it can be seen that the code having the configuration according to the present embodiment is sufficient to withstand the load. Here, the X direction is as described above, the Y direction is a direction perpendicular to the X direction on the cross section of the cord, and the Z direction is a direction in which the cord extends, and can be defined as a direction perpendicular to the XY plane. According to these simulation results, the legs of this embodiment can sufficiently withstand a high load, while including racks of reduced size and weight.

In addition, in the arrangement of the rack and the plate material as described above, not only the first space 171 and the second space 172, but also the subsidiary structure (not shown) such as the piping pipeline and the electric wiring, . Accordingly, in the case of disposing the subsidiary structure inside the core 100, it is possible to eliminate disturbance or interference between the subsidiary structure and other structures without a separate member.

Although the first plate 161 and the second plate 162 are provided between the first rack 141 and the second rack 142 in the present embodiment, For example, the arrangement as shown in Fig. 4 is also possible. 4 is a cross-sectional view of a cord 100 according to a second embodiment of the present invention.

4, the first plate 161 is attached to the side of the first cord 141 on the first cord member 110 side and the side of the second rack 142 on the side of the first cord member 110 While the second plate 162 is engaged with the second cord member 120 side surface of the first rack 141 and the second cord member 120 side surface of the second rack 142 have. The first plate 161 may be spaced apart from the inner surface of the first cord member 110 and the second plate 162 may be spaced from the inner surface of the second cord member 120.

In the cord 100 according to the present embodiment, the plate members 161 and 162 can contact the first rack 141 and the second rack 142 with a wider area. Thus, the cord 100 may have a structure that is well tolerated by a higher load.

5, the first plate 161 is coupled to the inner surface of the first cord member 110, and the second plate 162 is coupled to the inner surface of the second cord member 120 To the inner side. 5 is a cross-sectional view of a cord according to a third embodiment of the present invention.

5, in the cord 100 according to the present embodiment, the first plate 161 is connected to the first rack 141 and the second rack 142 in a larger area, While the second plate 162 is engaged with the first rack 141 and the second rack 142 in a larger area while the inner surface of the inner surface of the second cord member 120 So that they can be coupled to each other.

As a result, the cord members 110 and 120 and the racks 141 and 142 are combined and the contact area between the racks 141 and 142 and the plate members 161 and 162 increases, The coupling between the racks 141, 142 and the plate members 161, 162 becomes more rigid.

The above-described means for joining the cord member, the rack and the plate member may be welding, but the present invention is not limited thereto. The cord member, the rack, and the plate member may be freely moved by other types of engaging means within a range not hurting the spirit of the present invention And may include additional configurations for such coupling.

While the present invention has been described with respect to specific embodiments of the floating structure including the legs according to the embodiments of the present invention, the present invention is not limited thereto, and the scope of the present invention is not limited thereto. Should be interpreted as having. Skilled artisans may implement a pattern of features that are not described in a combinatorial and / or permutational manner with the disclosed embodiments, but this is not to depart from the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications may be readily made without departing from the spirit and scope of the invention as defined by the appended claims.

1: Floating structure 10: Hull
20: Leg 21: Brace
100: Code 110: First code member
111: one end of the first code member 112: one end of the second code member
120: second code member 121: one end of the second code member
122: the other end of the second code member 140:
141: first rack 142: second rack
161: first plate 162: second plate
171: first space 172: second space
173: Third space B: seabed
S: sea level

Claims (7)

A leg installed on a floating structure for selectively fixing the floating structure to the seabed,
A plurality of chords; And
And a brace connecting the codes to each other,
The code includes:
A first code member;
A second code member disposed opposite the first code member;
A first rack and a second rack provided between the first code member and the second code member and joined to the first code member and the second code member; And
A first plate connecting the first rack and the second rack to each other; And
And a second plate that connects the first rack and the second rack to each other and is spaced apart from the first plate,
Wherein the first rack, the second rack, the first plate, and the second plate divide the internal space of the cord into a first space, a second space, and a third space,
The first plate is connected to a surface of the first rack on the side of the first code member and a surface of the second rack on the side of the first code member and is spaced from the inner surface of the first code member,
The second plate is connected to the surface of the first rack on the second code member side and the surface of the second rack on the side of the second code member and is spaced apart from the inner surface of the second code member,
Wherein the third space is an empty space surrounded by the first rack, the second rack, the first plate, and the second plate,
Leg of floating structure. delete delete delete delete delete A foot comprising a leg of the floating structure as claimed in claim 1,
hull;
A spud can attached to the lower end of the leg of the floating structure; And
Floating structures including guide rails mounted on the hull.
KR1020150108001A 2015-07-30 2015-07-30 Leg of floating structure KR101792846B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150108001A KR101792846B1 (en) 2015-07-30 2015-07-30 Leg of floating structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150108001A KR101792846B1 (en) 2015-07-30 2015-07-30 Leg of floating structure

Publications (2)

Publication Number Publication Date
KR20170014503A KR20170014503A (en) 2017-02-08
KR101792846B1 true KR101792846B1 (en) 2017-11-01

Family

ID=58155475

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150108001A KR101792846B1 (en) 2015-07-30 2015-07-30 Leg of floating structure

Country Status (1)

Country Link
KR (1) KR101792846B1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2521689Y2 (en) * 1991-04-09 1996-12-25 日立造船株式会社 Jack up device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2521689Y2 (en) * 1991-04-09 1996-12-25 日立造船株式会社 Jack up device

Also Published As

Publication number Publication date
KR20170014503A (en) 2017-02-08

Similar Documents

Publication Publication Date Title
US8025020B2 (en) Auxiliary float of floating structure and method for remodeling floating structure
CA2828749C (en) A cantilever system and method of use
KR101384712B1 (en) Deck elevating system
JP2022160521A (en) Ocean work facility and manufacturing method for the same
WO2017056972A1 (en) Ocean floating body structure
KR101665329B1 (en) Leg System For Offshore Vessel
US20060042181A1 (en) Brace assembly for truss legs of offshore structures
KR101792846B1 (en) Leg of floating structure
CN103452088A (en) Jacking device for offshore platform
CN103723624B (en) Hydraulic double-type crane and installation method
KR101487504B1 (en) Ship Construction Method
KR20140055450A (en) Jack-up machine of barge
KR20130061890A (en) Combination structure of frame for service tower
KR102122093B1 (en) Riser and cassion mountiong method and mounting structure thereof
WO2014200432A1 (en) A jacking device
KR101690966B1 (en) Method for installing leg of marine structure
KR101762743B1 (en) Leg management apparatus and operating method thereof
KR101774915B1 (en) Method for manufacturing leg for jacket
KR20160047752A (en) Floating structure
KR101973083B1 (en) Offshore structure
KR101497448B1 (en) deck for floating dock and manufacturing method for offshore structure using the same
KR20150003734U (en) A leg leveling connector of jack-up rig for land building work
KR20220054007A (en) Jacking system for barge
KR20130115449A (en) Construction method for jack up type structure
CN106638532A (en) Double-row main cylinder successive lifting and lowering device

Legal Events

Date Code Title Description
A201 Request for examination
AMND Amendment
E601 Decision to refuse application
AMND Amendment
X701 Decision to grant (after re-examination)
GRNT Written decision to grant