KR20170013043A - Method for combine chord with rack gear of leg for floating structure - Google Patents

Method for combine chord with rack gear of leg for floating structure Download PDF

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Publication number
KR20170013043A
KR20170013043A KR1020150105869A KR20150105869A KR20170013043A KR 20170013043 A KR20170013043 A KR 20170013043A KR 1020150105869 A KR1020150105869 A KR 1020150105869A KR 20150105869 A KR20150105869 A KR 20150105869A KR 20170013043 A KR20170013043 A KR 20170013043A
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KR
South Korea
Prior art keywords
rack gear
cord
welding
leg
floating structure
Prior art date
Application number
KR1020150105869A
Other languages
Korean (ko)
Inventor
조태민
박주신
장기복
전민성
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.)
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Publication date
Application filed by 삼성중공업 주식회사 filed Critical 삼성중공업 주식회사
Priority to KR1020150105869A priority Critical patent/KR20170013043A/en
Publication of KR20170013043A publication Critical patent/KR20170013043A/en

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    • B63B9/065—
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2221/00—Methods and means for joining members or elements
    • B63B2221/02—Methods and means for joining members or elements by welding

Abstract

Disclosed are a method for assembling a rack gear unit and a chord unit of a leg for a floating structure. According to one embodiment of the present invention, the present invention provides the method for assembling a rack gear unit and a chord unit of a leg for a floating structure, comprising: a step of preliminarily forming a welding unit at a position where a chord unit is assembled in a rack gear unit in the longitudinal direction of the rack gear unit; a step of arranging the chord unit on one side surface of the rack gear unit corresponding to the welding unit; and a step of performing a welding work outside a boundary portion formed by the chord unit and the rack gear unit to enable the chord unit, the rack gear unit, and the welding unit to be entirely coupled through a welding bead generated in the welding work.

Description

Field of the Invention [0001] The present invention relates to a cord portion of a leg for a floating structure and a rack gear subassembly method.

The present invention relates to a cord portion of a leg for a floating structure and a rack gear subassembly method.

As the demand for environmentally friendly energy development grows, the development using wind power generators is getting popular all over the world. However, installation of wind turbines requires strict environmental conditions. For example, the place where the wind turbine is installed should be a place where a certain level of wind speed can be guaranteed to obtain a meaningful rotation of the blade, and the pollution caused by the noise generated when the wind turbine is driven should not be a problem. Even if these environmental conditions are satisfied, a very large area of space is required to install a wind turbine generator.

In recent years, there has been an increasing interest in offshore wind turbines, which are relatively free from the above-mentioned constraints. Offshore wind turbines can be installed in a variety of ways, but generally they are constructed by dividing the components into several units, making them on land, and then transferring the units to sea for assembly. A ship that moves offshore wind turbine units on the sea to the sea and installs offshore wind turbine generators is commonly referred to as a wind turbine installation vessel (WTIV).

Such a wind turbine installation vessel can be operated in a transit mode and a jack-up mode, depending on the nature of the operation. Specifically, the ship installed with the wind turbine moves to the navigation mode to the position where the off-axis wind turbine is to be installed. In sailing mode, the legs can be kept moving up the hull to reduce resistance by sea water. After that, the ship installed with the wind power generator is switched to the jack-up mode, and the leg is fixed to the bottom of the seabed, and the hull is lifted up along the leg so that the hull is separated from the sea surface by a certain distance. When the hull reaches a certain position, the installation ship of the wind power generator stops the movement of the hull and installs the offshore wind power generator. When the installation is completed, proceed in the reverse order of the above procedure and move to the next installation position.

As another example of the floating structure operated in the sailing mode and the jack-up mode as described above, there is a jack-up platform having a drilling function. The jack-up platform includes a derrick for drilling, moves to the drilling position in sailing mode, switches to jack-up mode, locks the leg down to the underside of the ground, and lifts the hull along the leg. The jack-up platform performs the drilling operation while the hull is separated from the sea level. When drilling is completed, the jack-up platform can be moved to the next drilling position in the reverse order of the above procedure.

This floating structure penetrates the legs to the seabed in the jack-up mode. At the lower end of the leg, a spud can is provided for facilitating penetration into the seabed ground and for increasing the gripping force, and the leg penetrates a certain depth into the seabed so that the spud can is fixed to the seabed.

Generally, in a floating structure, legs can be formed in a triangular truss structure, and include a cord that serves as a pillar, a rack gear that is coupled to the cord and protrudes in pairs on both sides of the cord, rack gear. The legs of such floating structures are manufactured through the welding of cords and rack gears, which can cause the molten weld beads to flow into the cord during welding of the cord and the rack gear.

Therefore, in order to prevent this, a back plate for blocking inflow of weld beads is installed at the boundary between the inner side of the cord and the rack gear. In the manufacturing of the leg, the operation of installing the back plate is performed by moving the back plate Can be very tricky and requires a lot of time, resulting in a problem of lowering the manufacturing productivity of the leg.

In addition, there is a problem that the cord and the rack gear are not normally welded due to the problem that the back plate is moved during the manufacture of the leg of the floating structure, and the quality of the leg is deteriorated.

Further, at the time of manufacturing the legs of the conventional floating structure, there is a problem that the back plate must be removed after the welding of the cord and the rack gear is completed, thereby causing a problem that the productivity of the legs is lowered.

Korean Patent Laid-Open No. 10-2014-0003225 (published on April 01, 2009)

An embodiment of the present invention is to provide a cord portion and a rack gear subassembly method of a leg for a floating structure which can improve the leg productivity by facilitating the welding of the cord portion and the rack gear portion during the manufacture of the leg of the floating structure .

Further, an embodiment of the present invention is to provide a cord portion and a rack gear subassembly method of a leg for a floating structure that does not require removal of a back plate even after the welding of the cord portion and the rack gear portion in manufacturing the leg of the floating structure do.

According to an aspect of the present invention, there is provided a method of manufacturing a rack gear, comprising: forming a welded portion along a longitudinal direction of the rack gear portion at a position where a cord portion is to be assembled in a rack gear portion; Disposing the cord portion on one side of the rack gear portion in accordance with the welded portion; And

And a step of welding the outside of the boundary between the cord portion and the rack gear portion so that a weld bead formed at the time of welding joins both the cord portion and the rack gear portion and the weld portion. And a rack gear subassembly method can be provided.

The welded portion may protrude in the form of a line along the longitudinal direction of the rack gear portion.

In addition, the welding portion may be formed such that a plurality of lines are spaced apart in parallel in consideration of the width of the cord portion.

Further, when the cord portion is disposed in the rack gear portion, the welding portion may be disposed so as to be located inside the width direction of the cord portion.

Further, the weld portion may block a gap formed between the cord portion and the rack gear portion, thereby preventing the molten weld bead from flowing into the inside of the cord portion.

According to the embodiment of the present invention, the cord portion and the rack gear subassembly method of the leg for the floating structure, which can improve the productivity of the leg by facilitating the welding of the cord portion and the rack gear portion in the manufacture of the leg of the floating structure, can do.

According to the embodiment of the present invention, the code portion of the leg for the floating structure and the rack gear subassembly method which do not require a subsequent process such as back plate removal after welding of the cord portion and the rack gear portion in the manufacture of the leg of the floating structure .

1 is a side view showing a jack-up state of a floating structure,
Fig. 2 is a plan view of Fig. 1 schematically showing a leg of a floating structure, Fig.
Fig. 3 is a plan view partially showing a state in which the cord portion and the rack gear portion are welded,
FIG. 4 is a flowchart showing a code portion and a rack gear subassembly method of a leg for a floating structure according to an embodiment of the present invention;
5 is a view for explaining steps of forming a weld portion in a cord portion and a rack gear subassembly method of a leg for a floating structure according to an embodiment of the present invention,
6 is a view showing a state in which a cord portion is disposed in a rack gear portion having a welded portion,
7 is a view showing a state in which the outer side of the boundary portion between the code portion and the rack gear portion is welded.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, configurations and operations according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The following description is one of many aspects of the claimed invention and the following description may form part of the detailed description of the invention.

However, the detailed description of known configurations or functions in describing the present invention may be omitted for clarity.

While the invention is susceptible to various modifications and its various embodiments, it is intended to illustrate the specific embodiments and the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals such as first, second, etc. may be used to describe various elements, but the elements are not limited by such terms. These terms are used only to distinguish one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a side view showing a jack-up state of a floating structure, Fig. 2 is a plan view of Fig. 1 schematically showing a leg of a floating structure, Fig. 3 is an enlarged view of "B" Fig. 6 is a plan view partially showing a state where the gear portion is welded.

Referring first to FIGS. 1 and 2, the floating structure 10 may be a wind turbine installation vessel (WTIV) or a jack-up platform. However, the spirit of the present invention is not limited thereto, and the floating structure 10 having a jack-up mode may be included in the scope of the present invention.

The leg 20 of the floating structure 10 can be installed on the hull 11 so as to be movable up and down. In order to improve the supporting force against the seabed ground, the height of the leg 20 And the support structure can be varied.

The legs 20 are provided so as to penetrate the hull 11 in the vertical direction and have a rigidity enough to withstand the load of the hull 11 in a working state and have various shapes such as a cylindrical shape, a square truss structure, . ≪ / RTI >

Specifically, the legs 20 include a chord portion 21 serving as a pillar and a plurality of legs 21 projecting from both sides of the cord portion 21 and extending along the longitudinal direction (vertical direction) of the cord portion 21 And may include a rack gear portion 22.

3, the cord portion 21 and the rack gear portion 22 can be coupled with each other by welding, and the cord portion 21 and the rack gear portion 22 can be connected to each other by welding It is possible to arrange them at appropriate positions and to combine them together through welding. At this time, since the welding beads 30 melted during welding can flow into the inside of the cord portion 21 through the clearance between the cord portion 21 and the rack gear portion 22, A back plate (not shown) is provided at a boundary between the cord portion 21 and the rack gear portion 22. [ However, the conventional back plate has various problems as described above. Therefore, in order to solve this problem, in place of the method of assembling the cord portion 21 and the rack gear portion 22 using the conventional back plate, A code portion and a rack gear subassembly method according to the present invention can be provided.

4 to 6, a description will be given of a method of assembling a cord portion and a rack gear portion of a leg for a floating structure according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating a code portion and a rack gear subassembly method of a leg for a floating structure according to an exemplary embodiment of the present invention. FIG. 5 is a cross- 6 is a diagram showing a state in which a cord portion is disposed in a rack gear portion having a welded portion, and FIG. 7 is a view showing a state in which the outer side of the boundary portion between the cord portion and the rack gear portion Fig.

4, the cord portion and the rack gear subassembly method of the leg for the floating structure according to the present embodiment includes a step S10 of forming a weld portion 100 and a step of forming a cord portion (S20) of placing the cord portion 21 and the step (S30) of welding the cord portion 21 and the rack gear portion 22 to each other.

5, the step of forming the welded portion 100 may include the step of forming the welded portion 100 in the longitudinal direction of the rack gear portion 22 at a position where the cord portion 21 is assembled in the rack gear portion 22 The welding portion 100 may be formed in advance.

The weld portion 100 may be provided in a line along the longitudinal direction of the rack gear portion 22 and may be formed to protrude at a predetermined height on the surface of the rack gear portion 22. [ have. The projecting height of the welding portion 100 is approximately the height of the point welding, and may be continuously formed along the longitudinal direction so as to prevent the point welding from being broken.

The welding portion 100 may be formed such that a plurality of wires are spaced apart in parallel on the rack gear portion 22 in consideration of the width of the cord portion 21. Since the welding part 100 can be formed automatically by using a welding machine, the distance of the welding part 100 can be determined in consideration of the width of the cord part 21. [

6, the step S20 of placing the cord part 21 in the rack gear part 22 may be performed by moving the rack gear part 22 in which the welding part 100 is located according to the distance of the welding part 100 And the code portion 21 is disposed on one side surface of the base portion.

When the cord portion 21 is arranged in the rack gear portion 22, the cord portion 21 is disposed such that the weld portion 100 is located inside the width direction of the cord portion 21. [ Specifically, the corners formed at both inner ends of the cord portion 21 are hooked to the welded portion 100 spaced apart by a predetermined distance, so that the cord portion 21 is not yet attached to the rack gear portion 22 It is not welded, but it is caught by the welding part 100, and free movement can be restricted.

The step S30 of welding the cord portion 21 and the rack gear portion 22 to each other in a state where the cord portion 21 is engaged with the rack gear portion 22 by the weld portion 100 Can be performed.

7, the welding step S30 of the cord portion 21 and the rack gear portion 22 is performed by welding the welder 1 outside the boundary between the cord portion 21 and the rack gear portion 22, The weld bead 30 generated at the time of welding may join the cord portion 21, the rack gear portion 22, and the weld portion 100 together.

The weld bead 30 may be welded to the cord portion 21, the rack gear portion 22 and the weld portion 100 because the weld bead 30 is in a molten state due to welding heat during the welding operation, The gap formed between the boundary between the portion 21 and the rack gear portion 22 can not penetrate because the welding portion 100 is blocking it. That is, the welding part 100 disposed inside the cord part 21 can block the molten weld bead 30 from entering the inside of the cord part 21 by blocking the gap.

Here, if the welding heat is very large, a part of the cord portion 21, the rack gear portion 22, and the welding portion 100 on the boundary portion melts together with the weld bead 30, Can be combined as if it were the body, and thus the welding effect can be doubled.

While the present invention has been described in connection with what is presently considered to be preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention is not limited thereto.

1: Welding machine 21: Code part
22: rack gear portion 30: welding bead
100:

Claims (5)

Forming a welded portion along the longitudinal direction of the rack gear portion at a position where the cord portion is to be assembled in the rack gear portion;
Disposing the cord portion on one side of the rack gear portion in accordance with the welded portion; And
And joining the cord portion, the rack gear portion and the welded portion by welding a boundary portion between the code portion and the rack gear portion to join the cord portion and the rack gear subassembly. The method according to claim 1,
Wherein the welding portion is protruded in a line shape along the longitudinal direction of the rack gear portion. 3. The method according to claim 1 or 2,
Wherein the welded portion is formed such that a plurality of lines are spaced apart in parallel in consideration of the width of the cord portion. The method according to claim 1,
And wherein when the cord portion is disposed in the rack gear portion, the weld portion is disposed inside the width direction of the cord portion. 5. The method of claim 4,
Wherein the welding portion blocks a gap formed between the cord portion and the rack gear portion to block the welding bead melted during welding from entering the inside of the cord portion, .
KR1020150105869A 2015-07-27 2015-07-27 Method for combine chord with rack gear of leg for floating structure KR20170013043A (en)

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KR1020150105869A KR20170013043A (en) 2015-07-27 2015-07-27 Method for combine chord with rack gear of leg for floating structure

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Application Number Priority Date Filing Date Title
KR1020150105869A KR20170013043A (en) 2015-07-27 2015-07-27 Method for combine chord with rack gear of leg for floating structure

Publications (1)

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KR20170013043A true KR20170013043A (en) 2017-02-06

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140003225A1 (en) 2012-06-28 2014-01-02 Alcatel-Lucent Canada Inc. Dynamic reaction to diameter routing failures

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140003225A1 (en) 2012-06-28 2014-01-02 Alcatel-Lucent Canada Inc. Dynamic reaction to diameter routing failures

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