KR20170111211A - Offshore structure - Google Patents

Abstract

An offshore structure is disclosed. An offshore structure according to an embodiment of the present invention includes a main body; A jack case installed in the main body; A leg portion which is installed to be supported by the jack case so as to be able to move up and down relative to the main body; And a crane mounted vertically along the outer wall of the jack case. According to the embodiment of the present invention, it is possible to install the crane by maximizing the space utilization of the offshore structure and to prevent or reduce the interference by the crane in the case of traction of the offshore structure, mooring work between the ships around the offshore structure, .

Description

Offshore Structures {OFFSHORE STRUCTURE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offshore structure, and more particularly, to an offshore structure having a jack-up system.

Offshore structures such as jack-up rigs, drill-ships, and wind turbine installation lines are supported by the legs on the sea floor in certain areas, and work such as drilling or installing wind turbines do. The offshore structure has a jack-up system to lift the legs. The jack-up system causes the legs to descend to the sea floor in jack-up mode, lifting the hull and cantilever sections above the surface of the water. For this purpose, the legs have a length that can be lowered from the water surface of the installation area to the sea floor, and are designed with high strength materials and structures to withstand environmental loads such as waves and tides. In addition, the jack-up system is designed with a rigid structure so that the leg can be stably supported and lifted.

The deck of the offshore structure is equipped with a crane for drilling and other operations. In order to maximize the working range of the crane, the crane is installed on the main deck of the offshore structure or on the outside of the hull. This provides advantages in terms of space utilization of offshore structures, but it can be beneficial in case of towing or mooring with nearby vessels, or when the crane interferes with other structures during the berthing of the harbor, .

An object of the present invention is to provide an offshore structure having a crane that can be lifted along the outer wall of a jack case having a jacking unit built therein.

Another problem to be solved by the present invention is to maximize the space utilization of the offshore structure and to install the crane and to prevent the interference by the crane in the case of traction of the offshore structures, mooring work between the ships around the offshore structure, And to provide an offshore structure that can be reduced or reduced.

The problems to be solved by the present invention are not limited to the above-mentioned problems. Other technical subjects not mentioned will be apparent to those skilled in the art from the description below.

An offshore structure according to an aspect of the present invention includes a main body; A jack case installed in the main body; A leg portion installed to be supported by the jack case and movable up and down relative to the main body; And a crane installed vertically along the outer wall of the jack case.

The marine structure includes a guide rail provided on an outer wall surface of the jack case in a vertical direction; And a lift driving unit for moving the crane along the guide rail.

The elevating drive unit includes: a lifting body for supporting the crane; A pinion member installed on the lifting body and coupled to the guide rail to be engaged with a rack gear formed in a vertical direction; And a driving unit installed on the lifting body to drive the pinion member to elevate the crane along the guide rail.

Wherein the jack case is installed in the main body, the leg portions are respectively installed in a plurality of jack cases, the crane is installed in each of the plurality of jack cases, And may be installed on the side wall facing the outside of the main body.

The plurality of cranes may be installed on side walls of the side wall of the jack case where a variation in load applied to the plurality of leg portions is minimized.

Wherein the offshore structure is installed on the crane and measures a distance between the crane and the leg portion; And a controller for stopping the operation of the crane and generating an alarm if the distance between the crane and the leg portion is less than a predetermined reference value.

According to an embodiment of the present invention, an offshore structure having a crane that can be lifted along the outer wall of a jack case having a jacking unit is provided.

According to the embodiment of the present invention, it is possible to install the crane by maximizing the space utilization of the offshore structure, to prevent the interference by the crane in the case of traction of the offshore structure, mooring work between the ships around the offshore structure, Can be reduced.

The effects of the present invention are not limited to the effects described above. Unless stated, the effects will be apparent to those skilled in the art from the description and the accompanying drawings.

1 is a side view schematically illustrating an offshore structure 100 according to an embodiment of the present invention.
2 is a plan view schematically illustrating an offshore structure 100 according to an embodiment of the present invention.
FIG. 3 is an enlarged perspective view of the 'A' portion of FIG. 2. FIG.
4 is an enlarged cross-sectional view of the portion 'B' of FIG. 3. FIG.
5 is a perspective view showing an offshore structure according to another embodiment of the present invention.

Other advantages and features of the present invention and methods for accomplishing the same will be apparent from the following detailed description of embodiments thereof taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and the present invention is only defined by the scope of the claims. Although not defined, all terms (including technical or scientific terms) used herein have the same meaning as commonly accepted by the generic art in the prior art to which this invention belongs. A general description of known configurations may be omitted so as not to obscure the gist of the present invention. In the drawings of the present invention, the same reference numerals are used as many as possible for the same or corresponding configurations. To facilitate understanding of the present invention, some configurations in the figures may be shown somewhat exaggerated or reduced.

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. In the present application, the terms "comprises", "having", or "having" are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, parts, or combinations thereof, whether or not explicitly described or implied by the accompanying claims.

An offshore structure according to an embodiment of the present invention is installed so that the crane is vertically movable along the outer wall of a jack case for raising and lowering a leg. According to this embodiment, it is possible to prevent or reduce the interference phenomenon caused by the crane at the time of towing the offshore structure, mooring work between ships around an offshore structure, or berthing the port, while securing space utilization of the offshore structure.

FIG. 1 is a side view schematically illustrating an offshore structure 100 according to an embodiment of the present invention, and FIG. 2 is a plan view schematically illustrating an offshore structure 100 according to an embodiment of the present invention. 1 and 2, an offshore structure 100 according to an embodiment of the present invention includes a main body 110, a jack case 120, a leg portion 130, and a crane 140.

The offshore structure 100 is equipped with a terminal facility for exploration, sampling, drilling, processing, refining, rehabilitation, wind power generation facilities, storage and transportation of crude oil, gas and submarine mineral, You can do the work. In the illustrated example, the offshore structure 100 is provided for drilling crude oil through a riser 40 from a wellhead, but the invention can be applied to offshore structures having various purposes and uses And is not limited to any specific purpose or purpose.

In the illustrated example, the body 110 has a substantially triangular shape, but may be provided with a rectangular or other various shapes. In one embodiment, the body 110 may be provided with a door pool for installation of a drill pipe or the like. The main body 110 may also be provided with a propulsion device (not shown) for movement and position control of the offshore structure 100.

The leg portion 130 is installed to be supported by a jack case 120 installed in the main body 110. The leg portion 130 is installed to move up and down with respect to the main body 110. The leg portion 130 may include a plurality of legs 132, 134, and 136 that are dispersed in the body 110. The main body 110 may float on the sea surface before being jacked up by the leg portions 130 and may be supported by the leg portions 130 in the jack-up mode. The load of the main body 110 can be dispersed and stably supported by the plurality of legs 132, 134 and 136 when the main body 110 is lifted above the sea level.

The legs 132, 134, and 136 are installed on the main body 110 so as to be movable in the up and down direction Z. The main body 110 has a lifting and driving apparatus (not shown) for relatively moving the legs 132, 134, 136 in the vertical direction Z. The main body 110 may be provided with a control unit (not shown) for controlling the operation of the lifting and driving apparatus for lifting and lowering the leg unit 130. The legs 132, 134, 136 may be provided in any suitable number necessary to support the body 110. In the illustrated example, three legs 132, 134, and 136 are provided on the vertex of the equilateral triangle in the main body 110, but the number and position of the legs are not limited thereto, And the like.

The leg portion 130 is formed to penetrate the main body 110 in the up and down direction Z and is formed to have rigidity and structure capable of withstanding the load of the main body 110 in a jack-up state. The leg portion 130 may be formed in a cylindrical shape, a square truss structure, a triangular truss structure, or various other shapes. The leg portion 130 is lowered toward the sea floor with respect to the main body 110 to raise the main body 110 including the hull and the cantilever portion in the jack up mode to the water surface, Thereby supporting the main body 110.

A sprung can 130a may be provided at the lower end of each of the legs 132, 134 and 136. The sprung can 130a may be provided to stably secure the lower end of the legs 132, 134, 136 to the underside 50. [ The spud can 130a may penetrate into the seabed 50 in a jack-up mode. The spud can 130a may be formed to have a larger planar area than the leg portion 130 for stable fixing of the leg portion 130. [

The jack case 120 has an inner space, and a jacking unit having a motor, gear, or the like for lifting and lowering the leg portion 130 may be installed in the inner space. The legs 132, 134 and 136 are moved in the vertical direction Z with respect to the main body 110 by the operation of the jacking unit or the main body 110 is moved up and down with respect to the legs 132, Z). ≪ / RTI >

The jacking unit may include, for example, a pinion gear coupled with a rack gear formed along the lengthwise direction of the leg portion 130, and a motor for driving the pinion gear. The relative movement between the main body 110 and the leg portion 130 can be performed in the vertical direction by interlocking the pinion and the rack. However, this is only exemplary, and the leg portion 130 may be raised and lowered with respect to the main body 110 by various mechanism mechanisms other than the rack / pinion.

The jack case 120 may be provided for each leg 132, 134, 136. The jack case 120 may be provided in the main deck of the main body 110. The jack case 120 may include an upper guide installed on the upper side and a lower guide installed on the lower side. The upper guide may be provided on the main deck side of the main body 110 and the lower guide may be provided inside the main body 110. [ The upper guide and the lower guide can guide the leg portion 130 up and down.

In one embodiment, the legs 132, 134, 136 may be in the form of a triangular prism. The legs 132, 134 and 136 may be composed of three pillars called chords and a rack formed along the longitudinal direction of the pillars. The columns can be provided at 120 ° intervals. The pillars may be interconnected by a plurality of braces.

The jack case 120 has side walls 122, 124, 126 in the circumferential direction. The sidewalls 122, 124, 126 may be supported by a brace, a wall, or the like. The sidewalls 122, 124, 126 may be provided to face the corner portions of the legs 132, 134, 136. The inner space of the sidewalls 122, 124, 126 of the jack case 120 may be provided with a pinion that engages with the rack gear provided on the legs 132, 134, 136, and a motor that drives the pinion.

The crane 140 is installed so as to be vertically movable along the outer wall of the jack case 120. In one embodiment, the cranes 140 may be installed on the sidewalls of any of the sidewalls 122, 124, 126 of the jack case 120. Since the crane 140 is lifted and lowered on the outer wall surface of the jack case 120, the operation can be performed without interfering with the leg portion 130. The crane 140 can be used without particular limitation as long as it can perform operations such as moving a structure (for example, a riser, a casing, etc.) necessary for marine operation. In the illustrated example, the cranes 140 are installed in all the jack cases 120, but it is also possible that the cranes 140 are installed in only some of the jack cases 120.

FIG. 3 is an enlarged perspective view of the 'A' portion of FIG. 2. FIG. 1 to 3, a guide rail 150 may be provided on the outer wall surface of the jack case 120 in the up and down direction Z. The guide rail 150 may be provided to guide the lifting and lowering of the crane 140. The guide rail 150 may be provided in the form of a channel or an H-beam. The guide rail 150 may be vertically formed on the side wall of the jack case 120 or attached to the side wall of the jack case 120 by means of bolts or the like. Alternatively, the guide rail 150 may be provided in other ways.

4 is an enlarged cross-sectional view of the portion 'B' of FIG. 3. FIG. 1 to 4, the lifting and lowering driving unit 160 lifts the cranes 140 along the guide rails 150. In one embodiment, the lifting and lowering driving unit 160 may include a lifting body 162, a pinion member 164, and a driving unit (not shown). The lifting body 162 is provided to support the crane 140. The pinion member 164 is mounted on the lifting body 162 and is engaged with the rack gear 152 formed in the up and down direction on the guide rail 150. The driving unit (for example, a driving motor / speed reducer) is installed on the lifting body 162 and drives the pinion member 164 to move the crane 140 along the guide rail 150.

When the use of the crane 140 is not necessary, the lifting body 162 is lowered by the pinion member 164 to move the crane 140 to the lowermost position in the vicinity of the main deck, and when the use of the crane 140 is required The lifting body 162 can be lifted by the pinion member 164 to move the crane 140 to the upper end of the jack case 120 to secure the maximum boom angle.

In one embodiment, the crane 140 includes a sidewall 122, 124, 126 of the jack case 120 that is positioned in a direction toward the outside of the main body 110, so as to maximize the working range for the marine structure, (Side walls located in a direction opposite to the direction toward the center of gravity of the offshore structure). The plurality of cranes 140 may be installed on the side walls of the jack cases 120 in a symmetrical manner with respect to the center of gravity of the offshore structure 100. Accordingly, the balance of the offshore structure 100 can be stably maintained, the time required for mooring the offshore structure 100 can be shortened, and the work efficiency can be improved by reducing the fluctuation of the offshore structure 100 .

As another example, the plurality of cranes 140 installed in the different jack cases 120 may each have a load applied to the plurality of legs 122, 124, 126 among the side walls 122, 124, 126 of the jack case 120 May be installed on the side wall 122 where the deviation of the side walls 122 is minimized. The deviation of the loads applied to the legs 122, 124, 126 can be calculated based on the design data of the offshore structure 100. According to this embodiment, a uniform load is applied to the legs 122, 124, 126, thereby preventing the load from concentrating on the specific leg, minimizing the work interruption due to the maintenance of the leg, The work can be performed smoothly.

5 is a perspective view showing an offshore structure according to another embodiment of the present invention. In the following description of the embodiment of FIG. 5, redundant description of the same or corresponding components to those of the previously described embodiment may be omitted. Referring to FIG. 5, the offshore structure may further include a sensor unit 170 and a control unit (not shown). The sensor unit 170 is installed in the crane 140 to measure the distance between the crane 140 and the leg unit 130. In one embodiment, the sensor unit 170 may be provided as a laser distance sensor that senses a nearby object or measures a distance to an object, but other sensors capable of sensing the leg unit 130 may be used.

The control unit receives the measurement value from the sensor unit 170 and may stop the operation of the crane 140 and generate an alarm if the distance between the crane 140 and the leg unit 130 is less than a preset reference value. The alarm may be generated by outputting a warning sound to the crane cockpit or by displaying a warning message on the screen. According to the embodiment of FIG. 5, collision between the crane 140 and the leg portion 130 is prevented, thereby preventing an accident.

According to the embodiment of the present invention, since the crane is installed using the side wall of the jack case, space utilization of the offshore structure can be maximized. According to this embodiment, since the interference between the crane and the surrounding structure can be prevented or reduced during the towing of the offshore structure, mooring work between the ships around the offshore structure, or berthing of the harbor, work can be efficiently performed.

It is to be understood that the above-described embodiments are provided to facilitate understanding of the present invention, and do not limit the scope of the present invention, and it is to be understood that various modifications are possible within the scope of the present invention. It is to be understood that the technical scope of the present invention should be determined by the technical idea of the claims and the technical scope of protection of the present invention is not limited to the literary description of the claims, To the invention of the invention.

40: riser 50: sea floor
100: offshore structure 110: main body
120: jack case 122, 124, 126:
130: leg portions 132, 134, 136:
140: Crane 150: Guide rail
152: rack gear 160:
162: lifting body 164: pinion member
170:

Claims (6)

main body;
A jack case installed in the main body;
A leg portion supported by the jack case and installed to be able to move up and down through the main body; And
And a crane installed vertically up and down along an outer wall of the jack case. The method according to claim 1,
A guide rail provided on an outer wall surface of the jack case in a vertical direction; And
Further comprising a lifting and lowering portion for lifting and lowering the crane along the guide rail. 3. The method of claim 2,
The lift-
A lifting body for supporting the crane;
A pinion member installed on the lifting body and coupled to the guide rail to be engaged with a rack gear formed in a vertical direction; And
And a driving unit installed on the lifting body and driving the pinion member to elevate the crane along the guide rail. 4. The method according to any one of claims 1 to 3,
Wherein the jack case is provided on the main body in a plurality of positions,
The leg portions are respectively installed in a plurality of jack cases,
Wherein the crane is installed in each of the plurality of jack cases,
Wherein the plurality of cranes are respectively installed in side walls of the jack case facing the outside of the main body. 4. The method according to any one of claims 1 to 3,
Wherein the jack case is provided on the main body in a plurality of positions,
The leg portions are respectively installed in a plurality of jack cases,
Wherein the crane is installed in each of the plurality of jack cases,
Wherein the plurality of cranes are installed on side walls of the side wall of the jack case where a variation in load applied to the plurality of leg portions is minimized. 4. The method according to any one of claims 1 to 3,
A sensor installed in the crane to measure a distance between the crane and the leg portion; And
Further comprising a control section for stopping the operation of the crane and generating an alarm if the distance between the crane and the leg section is less than a preset reference value.

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