KR102295644B1 - Leg of a floating structure - Google Patents

Abstract

The present invention relates to the legs of a floating structure.
According to one aspect of the present invention, a rack gear unit; and a code part welded to the rack gear part, wherein the code part includes a code body having a semicircular cross-section; and a bottom surface formed integrally with the cord body, extending from inside both ends of the cord body, in surface contact with the rack gear unit, and a welding surface formed outside the bottom surface and welded to the rack gear unit. Legs of the floating structure comprising blocking plates may be provided.

Description

LEG OF A FLOATING STRUCTURE

The present invention relates to the legs of a floating structure.

As the demand for eco-friendly energy development increases, power generation using wind power generators is in the spotlight worldwide. However, in order to install a wind power generator, difficult environmental conditions are required. For example, the place where the wind power generator 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 it should be a place where pollution caused by noise generated when the wind power generator is driven is not an issue. In addition, even if these environmental conditions are satisfied, a very large area of space is required to install the wind power generator.

Recently, interest in offshore wind power generators that are relatively free from the above constraints is increasing. Offshore wind power generators can be installed in various ways, but are generally installed by dividing parts into several units and manufacturing them on land, and then moving the manufactured units to the sea and assembling them. A ship that moves a unit of an offshore wind generator manufactured on land to the sea and installs an offshore wind generator on the sea is generally called a Wind Turbine Installation Vessel (WTIV).

The wind power generator installation vessel can be operated in transit mode and jack-up mode due to the nature of the work. Specifically, the wind generator installation vessel moves to a position where the offshore wind generator is to be installed in the sailing mode. In the sailing mode, the leg can be maintained in a state moved upwards of the hull to reduce the resistance caused by sea water. Thereafter, the wind generator installation vessel switches to the jack-up mode, lowers the legs, drives them into the seabed, and lifts the hull along the legs so that the hull can be separated from the sea level by a certain distance. When the hull reaches a certain position, the wind generator installation vessel stops the movement of the hull and performs the task of installing the offshore wind generator, and when the installation is completed, proceeds in the reverse order of the above and moves to the next installation position.

On the other hand, as another example of the floating structure operated in the navigation 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 sail mode, switches to jack-up mode, lowers the legs, drives them into the seabed, and raises the hull along the legs. The jack-up platform performs drilling while the hull is separated from the sea level, and when the drilling operation is completed, it can be moved to the next drilling position by proceeding in the reverse order of the above sequence.

These floating structures penetrate the leg into the seabed in jackup mode. A spud-can is provided at the lower end of the leg to facilitate penetration into the seabed and to increase gripping force, and the leg penetrates to a certain depth into the seabed, thereby fixing the spud-can to the seabed.

In general, in a floating structure, the leg may be formed in a triangular truss structure, and a cord (Chord) serving as a pillar, coupled to the cord and protruding as a pair on both sides of the cord, extends along the length direction of the cord It may include a rack gear.

The leg having the above-described structure may be manufactured by welding the cord and the rack gear, but when the cord and the rack gear are welded, a problem in which the molten weld bead flows into the cord may occur.

Conventionally, to prevent this, a back plate is additionally attached to the inner portion of the cord among the boundary portions between the cord and the rack gear, and as the back plate is welded to the inner portion of the cord, the welding bead is prevented from flowing into the inner portion of the cord. could However, the conventional leg to which the back plate is attached has a problem in that the inspection and maintenance of the inner part of the code cannot be performed as the back plate is welded to the inner part of the cord.

In addition, when the welding condition between the backplate and the inner part of the cord is poor, or when a defect occurs in the inner part of the cord, cracks are generated in the cord due to the welding defect and defect, thereby reducing the structural strength of the entire leg. .

In addition, there is a problem in that it takes a lot of time to weld the backplate in a non-fixed state to the inner side of the cord, thereby reducing the productivity of manufacturing the leg.

Korean Patent Laid-Open Patent No. 10-2014-0003225 (published on January 09, 2014)

Embodiments of the present invention, it is intended to provide a floating structure that is easy to check and maintain the state of the leg of the floating structure.

In addition, it is an object of the present invention to provide a floating structure capable of preventing damage to a leg due to poor welding by easily welding a cord and a rack gear, and improving leg productivity.

According to one aspect of the present invention, a rack gear unit; and a code part welded to the rack gear part, wherein the code part includes a code body having a semicircular cross-section; and a bottom surface formed integrally with the cord body, extending from inner sides of both ends of the cord body, a bottom surface in surface contact with the rack gear unit, and a welding surface formed outside the bottom surface and welded to the rack gear unit. Legs of the floating structure comprising blocking plates may be provided.

In addition, the welding surface may be provided with a leg of the floating structure forming a welding groove that can be filled with a welding bead for welding the code portion and the rack gear.

According to another aspect of the present invention, the rack gear unit; and a code part welded to the rack gear part, wherein the code part includes a code body having a semicircular cross-section, and a floating weld groove formed at both ends of the cord body to be recessed toward the center of the semicircle. Legs of the expression structure may be provided.

In addition, a bottom surface of the blocking plate formed inside the end of the cord body by the welding groove may be provided with a leg of a floating structure that is in surface contact with the rack gear unit.

In addition, the welding groove may be provided with a leg of the floating structure including a curved section or inclined section recessed toward the inner side of the code section toward the end of the code section.

Embodiments of the present invention, it is possible to provide a leg of a floating structure that is easy to check and maintain the state of the leg of the floating structure.

In addition, it is possible to prevent damage to the leg due to poor welding by easily welding the cord and the rack gear, and it is possible to provide a leg of a floating structure capable of improving leg productivity.

1 is a side view showing a jack-up state of the floating structure according to the present embodiment.
FIG. 2 is a plan view taken along line AA of FIG. 1 .
FIG. 3 is an enlarged view of a portion "B" of FIG. 2 .
FIG. 4 is a view showing the code part of FIG. 3 in detail.
5 is a view showing another embodiment of the leg of FIG.
FIG. 6 is a view showing the code part of FIG. 5 in detail.

Hereinafter, specific embodiments for implementing the present technical idea will be described in detail with reference to the accompanying drawings. In addition, when it is determined that a detailed description of a related known configuration or function may obscure the gist of the present technical idea, the detailed description thereof will be omitted.

Figure 1 is a side view showing a jack-up state of the floating structure according to this embodiment, Figure 2 is a plan view of the line A-A of Figure 1, Figure 3 is an enlarged view of the "B" portion of Figure 2.

First, referring to FIGS. 1 and 2 , the floating structure 10 may be a wind turbine installation vessel (WTIV) or a jack-up platform, but in this embodiment, the floating structure ( 10) will be described as an example of a wind power generator installation vessel. However, the spirit of the present invention is not limited thereto, and any floating structure 10 having a jack-up mode to be described later may be included in the scope of the present invention.

In addition, the legs 20 of the floating structure 10 may be installed movably in the vertical direction on the hull 11, and the height of the legs 20 according to the topography of the seabed to improve the bearing capacity for the seabed. and the support structure may be variable.

The leg 20 is installed to penetrate the hull 11 in the vertical direction, has enough rigidity to withstand the load of the hull 11 in the working state, and has various shapes such as a cylinder, a square truss structure, a triangular truss structure, etc. can be formed with

Specifically, the leg 20 includes a cord unit 21 serving as a pillar, and a rack gear unit 22 protruding from both sides of the cord unit 21 and extending along the longitudinal direction (up and down direction) of the cord unit 21 . ), and may include a brace unit 40 connecting the plurality of cord units 21 .

FIG. 3 is an enlarged view of part "B" of FIG. 2 , and FIG. 4 is a view showing the code part 21 of FIG. 3 in detail.

Referring to FIGS. 3 and 4 , a pair of cord units 21 having a curved surface extending long in the vertical direction are coupled to both surfaces of the rack gear unit 22 to form a single ring with a long overall length. shape can be formed. The code unit 21 may include a code body 211 and a blocking plate 212, and the cross-section of the code body 211 is a circular arc having a central angle of 180°, that is, a curved surface having a semicircular shape is elongated. can be

In addition, a pair of brace parts 40 may be connected to the outer circumferential surface of the cord body 211 on one side (upper side of the rack gear part 22 ). ) can be connected by However, the leg 20 of the floating structure 10 according to the present embodiment does not necessarily include the brace part 40 , and may include only the cord part 21 and the rack gear part 22 .

In the code body 211 , a blocking plate 212 may be integrally formed at both ends of the code body 211 along the length direction of the code body 211 , and the blocking plate 212 is formed between the code body 211 and the code body 211 . The welding bead 30 for welding coupling between the rack gear units 22 may block a path that moves inside the code body 211 .

Specifically, the blocking plate 212 may have a plate shape extending from the inner side of both ends of the cord body 211, and includes a bottom surface 214 that is in surface contact with the rack gear unit 22 and the bottom surface 214. It may have a welding surface 213 that is formed outside and is welded to the rack gear unit 22 . As the bottom surface 214 of the blocking plate 212 is in surface contact with the rack gear unit 22, the space between the cord body 211 and the rack gear unit 22 may be blocked, and the welding surface 213 may be connected to the bottom surface ( A welding groove 215 may be formed as it is formed outwardly from the 214 . In this case, the welding groove 215 may be formed in a shape recessed toward the center of the semicircle at the end of the cord body 211 having a semicircular cross-section.

As shown, as the welding surface 213 has a curved section recessed inward toward the end of the cord body 211, the welding bead 30 can easily flow toward the welding surface 213, As the bottom surface 214 has a shape corresponding to one surface of the rack gear unit 22 , the bottom surface 214 may be in close contact with the rack gear unit 22 .

The blocking plate 212 is formed by processing an inner part of the end of the cord body 211 to extend toward the rack gear unit 22, or a welding groove 215 is formed outside the end of the cord body 211. It can be formed by processing. That is, in the blocking plate 212 and the welding groove 215 , the welding groove 215 may be formed by processing the blocking plate 212 depending on the processing method, and the blocking plate 212 according to the welding groove 215 processing. may be formed.

The welding groove 215 may be formed along the longitudinal direction of the code part 21 , and when the blocking plate 212 is formed by processing the welding groove 215 , the welding groove 215 is the code part 21 . It may be formed by machining or the like during manufacturing. The depth and size of the welding groove 215 may be changed according to the width and size of the blocking plate 212 to be formed. In addition, the welding bead 30 generated in the welding process between the code part 21 and the rack gear part 22 may be filled in the welding groove 215 .

Meanwhile, the rack gear unit 22 may have a width greater than the diameter of the cord unit 21 , and one side of the code unit 21 may be connected to one side and the other side of the code unit 21 may be connected with the other side. That is, the rack gear unit 22 may be mounted between the pair of code units 21 . In this case, the rack gear unit 22 has a shape protruding outward from the code unit 21 , and gears that can be engaged with the pinion gear of the leg guide unit (not shown) may be formed at both protruding ends.

The brace unit 40 may connect the plurality of cord units 21 by connecting the plurality of cord units 21 to form a triangle, such as a square, and to be connected. As shown, the three pairs of cords 21 may be connected in a triangular shape by the braces 40 , and at this time, the pair of braces 40 are mounted on the cords 21 located inside. can be
In addition, a portion of the brace 40 may be welded to the weld bead 30 .

FIG. 5 is a view showing another embodiment of the leg 20 of FIG. 3 , and FIG. 6 is a view showing the code part 21 ′ of FIG. 5 in detail.

5 and 6, in the blocking plate 212' according to this embodiment, the welding groove 215' is inclined toward the inner side of the cord part 21' as the welding groove 215' goes toward the end of the cord part 21'. The sloped section may be included, and the corresponding welding surface 213 ′ may also include an inclined section. In addition, the welding groove 215' may be formed by obliquely extending an inner part of the end of the cord body 211' or performing a chamfering process on the end of the cord body 211'.

Hereinafter, the action and effect of the leg 20 of the floating structure 10 according to one aspect of the present invention will be described.

In the leg 20 according to the present embodiment, the code part 21 , the rack gear part 22 and the brace part 40 may be coupled by welding, and in this case, the welding operation is performed in the longitudinal direction of the leg 20 . Since it is made according to the ease of the welding operation, the manufacturing time of the leg 20 and the quality of the leg 20 can be improved.

In the welding process, the welding bead 30 may be filled in a portion where the code part 21 and the rack gear part 22 are to be coupled, and the molten welding bead 30 is solidified to solidify the code part 21 and the rack. The gear unit 22 may be coupled. However, before the weld bead 30 is solidified, since the weld bead 30 is in a molten state, the weld bead 30 may flow to a part other than the part to be coupled, and the flow of the weld bead 30 is Since the strength of the leg 20 may be impaired by increasing the local thermal load on the leg 20, it needs to be blocked by the blocking plate 212 of the leg 20 according to the present embodiment.

Specifically, looking at the process in which the end of the code part 21 on one side and one surface of the rack gear part 22 are welded together, the bottom surface 214 of the blocking plate 212 has a shape corresponding to one surface of the rack gear part 22 . Since the bottom surface 214 can be in close contact with one surface of the rack gear unit 22 , the space between the cord unit 21 and the rack gear unit 22 can be blocked. After that, when a welding operation is performed between the end of the cord unit 21 and the rack gear unit 22 , the welding bead 30 may be filled in the welding groove 215 . At this time, as the welding grooves 215 and 215 ′ have a curved section or an inclined section recessed toward the inside of the cord body 211 , the flow of the weld bead 30 can be made smoothly, and thus the welding operation can be performed quickly can be done

On the other hand, the molten weld bead 30 flowing toward the inside of the weld groove 215 can be prevented from flowing further by the blocking plate 212, and after a considerable time has elapsed, the weld bead 30 is removed from the weld groove ( As the surface 215 is solidified, both surfaces of the welding surface 213 and the rack gear part 22 may be joined by welding. ) may be blocked by the blocking plate 212 from flowing into the code unit 21 , and the welding bead 30 may be filled only in the portion where the coupling between the code unit 21 and the rack gear unit 22 is to be made. Therefore, welding quality can be improved. In addition, since the operation of using a separate member such as a back plate to block the flow of the welding bead 30 or welding the back plate to the cord part 21 in advance is not performed, the manufacturing cost of manufacturing the leg 20 and The required time can be reduced.

In addition, since the inner part of the code part 21 is exposed and coupled to the rack gear part 22 , inspection and maintenance of the inner part of the cord part 21 can be easily performed.

As mentioned above, although the present invention has been described using preferred embodiments, the scope of the present invention is not limited to the specific embodiments described, and those of ordinary skill in the art may freely within the scope of the present invention. Substitution and change of components are possible, which also belongs to the right of the present invention.

10: floating structure 11: body
20: leg 21: code part
22: rack gear unit 30: welding bead
211: code body 212: blocking plate
213: welding surface 214: bottom surface
215: welding groove

Claims (5)

rack gear unit;
a code part welded to the rack gear part; and
and a brace part welded to the cord part,
the code part
a cord body having a semicircular cross-section; and
It is integrally formed with the cord body, extends from the inner side of both ends of the cord body, and is formed on a bottom surface contacting the rack gear unit and outside the bottom surface for welding the cord unit and the rack gear unit. a blocking plate having a weld groove into which a weld bead can be filled;
The blocking plate blocks the welding bead from flowing toward the inside of the code body so that the welding bead is positioned only between the welding groove and the rack gear unit,
The welding groove is recessed toward the center of the semicircle,
A portion of the brace portion is welded to the weld bead,
Legs of floating structures. delete delete delete delete

Images