KR101487460B1 - Erection method for leg of vessel - Google Patents

Abstract

A method of mounting a leg on a ship is disclosed. A method of mounting a ship leg according to an embodiment of the present invention includes the steps of disposing a lower leg at a lower portion of a leg well of the main body; Installing a mounting jig having an upper leg to be connected to the lower leg horizontally around the leg well; Installing a guide jig on an inner surface of a leg well of the main body; Wherein a crane around the body stands upright the upper leg and the mounting jig; Separating the pivot jig from the mounting jig; Lowering the upper leg and the mounting jig by the crane; Connecting the lower end of the upper leg and the upper end of the lower leg to each other; And disassembling the mounting jig and the guide jig.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for installing a leg of a ship for assembling a leg to a ship such as an offshore plant, floating structure, jack-up drilling rig or the like.

A typical example of a marine plant having legs is a jack-up drilling rig or a mobile offshore drilling unit (MODU).

They are currently being used mainly for the development of submarine oil and gas, and due to the depletion of oil and natural gas in coastal waters, their use is gradually shifting to deep water depths of several hundred meters, and thus large drilling facilities are required .

The large drilling facility has a large breadth (width of the widest part of the hull), a depth (a vertical distance between the top watertight deck and bottom of the hull) and a length over all, (The horizontal distance from the forefront of the athlete to the foremost means of the athlete) is short.

In addition, large drilling facilities, unlike ordinary ships, do not move when they are installed in a designated area. For example, in the case of a jack-up drilling rig, the leg structure of a jack-up drilling rig, when operated in a jack-up mode, has structural stiffness that can withstand out- of-environment loads (wave / current / wind etc) It is designed to receive a high strength material and less environmental load.

These leg structures are used in various forms (for example, lattic, rectangular, cylinder) and have various shapes depending on the connection method and structure of the main body and the legs.

The general jack-up drilling rig is mainly used for drilling. In the jack-up mode, it is possible to lower the leg structure down to the water depth of the water depth to be worked, and then to fix the end point of the leg or the sprung can spudcan) is forcibly penetrated downward by a few meters and fixed.

If the shape of this leg structure is intended to work at deeper water depths, such as in deep water, the leg length is only required to be longer.

However, in existing shipbuilding methods, the leg structure has a limit that can not be longer.

In other words, even if the leg structure is designed to be long, it is possible to make the legs long in accordance with the design, but it is possible to safely mount the legs manufactured in a long time in the body (e.g., platform) A problem may arise.

In other words, due to the nature of a jack-up drilling rig for use in deep water, the total length of one leg is about 250 meters.

Therefore, even if a leg having a total length as described above is produced within the yard of the shipyard, it is very difficult to assemble the leg into the body because of the following problems.

For example, when considering the use of a conventional Goliath crane used for loading heavy loads and heavy loads in a shipyard, the height of the Goliath crane is not more than 150 meters, , It is impossible to fit the leg well of the main body into the leg well.

Also, when using floating cranes simply by conventional methods known as maximum capacity cranes, due to problems with the maximum boom angle of floating cranes, the legs with a total length of 250 meters can be safely erected and assembled into the leg wells of the body It may not be possible.

In other words, conventionally, only a jack-up rig drying method having a short-length leg for use in a sea area is provided. Further, after inserting a plurality of leg parts separated in a shorter time than the total length of the legs into leg wells, It is very difficult to manage the degree of rigidity of the leg parts connected to each other by using the method of arranging the other leg parts at the upper and lower parts of the leg parts and then connecting them.

Further, since the height of the crane can be limited by lifting the leg part to the uppermost part and connecting the leg part to the existing leg part, the length of the leg necessary for the large-scale drilling facility or the deep- It is difficult to mount it, and a new mounting method for solving the problem is required.

U.S. Published Patent Application No. US2008 / 0247827 (published on September 10, 2008) Korean Patent Publication No. 10-2013-0021220 (published on Mar. 03, 2013)

The upper jig and the upper jig are mounted on the mounting jig, the mounting jig and the upper leg are mounted using a crane, and the mounting jig and the upper jig are mounted on the mounting jig. The upper leg can be precisely inserted and downwardly inserted into the leg well of the body by using the guide jig and by connecting the lower leg and the upper leg located below the leg well to each other, Which can be mounted on the leg well of the ship.

These and other objects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: FIG.

According to one aspect of the present invention, there is provided a method of fabricating a microelectronic device, comprising: disposing a lower leg under the leg well of the body; Installing a mounting jig having an upper leg to be connected to the lower leg horizontally around the leg well; Installing a guide jig on an inner surface of a leg well of the main body; Wherein a crane around the body stands upright the upper leg and the mounting jig; Separating the pivot jig from the mounting jig; Lowering the upper leg and the mounting jig by the crane; Connecting the lower end of the upper leg and the upper end of the lower leg to each other; And disassembling the mounting jig and the guide jig.

In the step of connecting the lower end of the upper leg and the upper end of the lower leg to each other, a process of being fixed by welding or being assembled by using a flange, a bolt and a nut may be performed.

The guide jig can guide the lowering of the mounting jig by engaging a plurality of pinion gears rotatably arranged along the vertical direction of the inner surface of the leg well to the rack gear of the mounting jig.

Further, after the step of disposing the lower leg at a lower portion of the leg well of the body, a step of installing the pivot jig seat at the edge of the leg well may be further performed.

In addition, after the step of vertically erecting the upper leg and the mounting jig, a step of separating the pivot jig seating portion from the rim of the leg well may be further performed.

The method of mounting a ship leg according to an embodiment of the present invention can provide a method of placing an integral upper leg that occupies most of the legs of a total length (for example, 250 meters) on the mounting jig and erecting the upper leg and the mounting jig .

In the embodiment of the present invention, the mounting jig and the upper leg are placed on the upper part of the leg well using the pivot and the crane, the upper leg and the mounting jig are inserted into the leg well by the guide jig and the crane of the leg well, The lower leg of the upper leg and the upper end of the upper leg below the leg well are welded to each other to prevent bending deformation of the upper leg by the mounting jig when the upper leg of a few hundred meters is erected, Legs of 250 meters or more can be safely assembled into legwells of the body.

In addition, since the upper leg itself is manufactured integrally, the use time of a crane such as a floating crane can be minimized as compared with a separating manufacturing method in which legs are partially separated and connected in a multistage manner in the conventional method.

In addition, since the present embodiment is relatively free from the quality control or the length limitation of the legs, the production efficiency can be greatly increased as compared with the conventional method.

FIG. 1 is a side view showing a jack-up drilling rig as an example of a ship to which an embodiment of the present invention is applied. FIG.
2 is a flowchart of a method of mounting a leg of a ship according to an embodiment of the present invention.
FIGS. 3 to 10 are side views of steps of the ship leg mounting method shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying 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 side view showing a jack-up drilling rig as an example of a ship to which an embodiment of the present invention is applied. FIG.

Referring to FIG. 1, a ship according to an embodiment of the present invention generally refers to a jack-up drilling rig, a jack-up rig, a drill rig, a barge, a marine work line, an offshore plant, etc., , A hull having legs, or a body.

However, for ease of explanation in this embodiment, explanation can be made by taking the jack-up drilling rig 1 as an example.

The jack-up drilling rig 10 is a representative marine platform for exploration and development of oil or gas. The jack-up drilling rig 10 includes a derrick facility 20 as a drilling tower, a main body 30 corresponding to a platform, (Not shown) for raising and lowering the legs, a housing 60 provided on the upper portion of the main body 30, a leg hole 40 provided on the leg 30, a leg 50 coupled to the leg well 40, , A helideck (70), and various drilling cranes (80).

The main body 30 may have a platform structure of any one of triangular, square, and pentagonal, and the legs 50 may also be three, four, or multiple according to the platform structure of the main body.

The leg 50 may also be a circular pipe shaft member or a triangular truss structure or the like and the spud can 53 may be further provided at the lower end of each leg 50. [

If the jack-up drilling rig 10 is manufactured for large or deep water, the total length L of the legs 50 may be 250 meters, but the design change of the mounting jig 100 (see FIG. 4) And can be produced at over 250 meters.

In the present embodiment, the crane may be a floating crane 90 (see FIG. 4), for example, in view of ease of explanation or requiring a crane capable of exhibiting the existing maximum capacity, When there is a device capable of rotating the upper leg 51 by hinging or pivoting, the floating crane 90 may not necessarily be limited to the floating crane 90 alone.

The leg 50 includes an integral upper leg 51 occupying the majority of the leg 50 and a lower leg 52 having the same cross sectional structure as the upper leg 51 and equipped with a spud can 53 below, ≪ / RTI >

For example, when the total length L of the legs 50 is 250 meters, the length L1 of the upper legs 51 may be 230 to 240 meters, and the length L2 of the lower legs 52 may be the length And may be 10 to 20 meters,

Since the connection point Q between the upper leg 51 and the lower leg 52 corresponds to one point in the leg loading process of the ship according to this embodiment, the connection point Q between the upper leg 51 and the lower leg 52 Q) can be relatively easily compared with the conventional method.

The upper leg 51 can also be made horizontally above the mounting jig 100 (see FIG. 4) and then placed on the body 30 by a floating crane 90.

The boom height of the floating cranes 90 is fixed and the boom height is relatively shorter than the length L1 of the upper legs 51. However, The upper leg 51 is sufficiently raised to be placed on the leg well 40 of the main body 30 because the upper leg 51 corresponds to the first to third frames 130, 140 and 150 of the mounting jig 100, .

When the upper leg 51 is completed, the mounting jig 100 and the upper leg 51 can be detached from or attached to a plurality of common securing devices 110 (E.g., a clamping device or the like), or they may be separated from each other when the securing device 110 is disassembled.

The mounting jig 100 includes a base frame 120 supporting the upper leg 51 and a plurality of securing devices disposed on both sides of the base frame 120, 110).

The mounting jig 100 includes a first frame 130 vertically erected at both sides of one end of the base frame 120 and a second frame 130 erected vertically at both sides of the other end of the base frame 120, A frame 140 and a third frame 150 relatively higher than the first frame 130 or the second frame 140. [

The mounting jig 100 includes a plurality of wires 135 connected between the first frame 130 and the third frame 150 and between the second frame 140 and the third frame 150, Lt; RTI ID = 0.0 > 160, < / RTI >

The first frame 130, the second frame 140, and the third frame 150 are disassembled from the base frame 120 in a bolt-coupled or disassemblable coupling structure. The wires 160 and 161 are also configured to be disassembled from the first frame 130, the second frame 140, and the third frame 150 using a shackle or the like.

The mounting jig 100 also includes a plurality of lugs 170 provided on the first to third frames 130, 140 and 150 and the base frame 120 to be connected to the lifting cables of the floating crane 90 .

The base frame 120 and the first to third frames 130, 140 and 150 of the mounting jig 100 serve as a skeleton of the upper leg 51 in the course of lifting up and erecting the upper leg 51, The upper leg 51 can be prevented from being bent and the force of the floating crane required to lift or raise the upper leg 51 and the mounting jig 100 can be transmitted to the upper leg 51, And to the mounting jig 100, as shown in Fig.

On the other hand, a pivot 200 (see FIG. 3) may be used for the upper leg 51 and the mounting jig 100 to be erected by floating cranes or the like. Here, the pivot 200 may be a device configuration consisting of a pair of pivot jig mount 210 and pivot jig 220, and the contents of such a device configuration are disclosed in Japanese Patent Application Laid-Open No. 10-2007-0070904.

2 is a flowchart of a method of mounting a leg of a ship according to an embodiment of the present invention.

Referring to FIG. 2, the present embodiment includes steps S120 through S180 for lifting up the upper leg while preventing the upper leg from being deformed, starting with step S110 of placing the lower leg below the leg well of the body ).

That is, after the step (S110) of placing the lower legs under the leg wells of the main body, in this embodiment, the upper legs are placed on the mounting jig, and after the mounting jig and the upper leg are erected by using the floating cranes, And the upper leg are inserted into the leg well of the body using the guide jig and then moved downwardly and precisely so that the lower leg and the upper leg located below the leg well are connected to each other so that the boom height of the floating crane is low A series of steps (S120 to S180) in which the legs can be sufficiently mounted on the leg well of the main body can be achieved.

In order to realize this embodiment, various manpower, equipments, facilities and the like which can be mobilized in the shipyard are used, which is generally known or can be practically practiced. Therefore, detailed description of the equipments etc. in this embodiment is omitted .

For example, after step (S110) of arranging the lower leg at the lower part of the leg well of the body, a step (S120) of horizontally mounting the mounting jig having the upper leg to be connected to the lower leg around the leg well, A step (S130) of installing a guide jig on the inner side surface of the leg well of the main body; and a step (S140) of vertically erecting the upper leg and the mounting jig by a crane around the main body.

(S150) of separating the pivot jig from the mounting jig (S150), lowering the upper leg and the mounting jig (S160), lowering the upper leg (S170) connecting the lower jaw to the lower jaw, and disengaging the mounting jig and the guide jig (S180).

Hereinafter, specific details of each step S110 to S180 will be described with reference to FIG. 3 to FIG.

FIGS. 3 to 10 are side views of steps of the ship leg mounting method shown in FIG.

Referring to FIG. 3, the method of loading the ship's legs can be done in a work area Q, such as a dock, a floating dock or a quay, in which a floating crane is accessible for use of a floating crane.

The work station Q may also be provided with a body support R having a height greater than the overall height of the seating jig S, the spud can 53 and the lower leg 52, The main body 30 may be placed.

At this time, the step of disposing the lower leg 52 at the lower part of the leg well 40 of the main body 30 is performed by loading and unloading the seating jig S by a transporter (not shown) . Here, the seating jig S may be provided with a seating groove on which the sprung can 53 of the lower leg 52 can be seated.

The mounting position of the seating jig S on which the sprung can 53 of the lower leg 52 is seated, that is, the docking point of the lower leg 52 with respect to the upper leg, can be determined by adjusting the position of the transporter . Through this, the lower leg 52 can be positively positioned below the leg well 40.

3, after the step of disposing the lower leg 52 at the lower part of the leg well 40 of the main body 30, the pivot jig seating part corresponding to one side part of the pivot 200, (S115) may be further provided to the leg well 40 at the edge of the leg well 40 as shown in FIG.

The pivot jig seat 210 can be secured to the upper surface of the rim of the leg well 40 in a bolt and nut coupling manner, or in a manner that removes the welded portion after welding.

The pivot jig 220 to be coupled to the pivot jig mount 210 can be coupled to the mounting jig 100 as shown in Fig.

Referring to FIG. 4, the pivot jig 220 may be coupled to the bottom end of the base frame 120 of the mounting jig 100 by bolting or welding.

Further, the circular hole 221 formed at the end of the pivot shaft of the pivot jig 220 is engaged with the recessed receiving hole 211 of the pivot jig receiving portion 210, so that operation as a pivot may be possible.

A pivot 200 consisting of a pair of pivot jig 220 and pivot jig seating 210 may be spaced apart from the rim of the leg well 40 along a plurality of widthwise directions of the base frame 120.

The floating cranes 90 may be used in the step of horizontally installing the mounting jig 100 on which the upper legs 51 to be connected to the lower legs 52 are mounted in the vicinity of the leg wells 40. [

A plurality of lifting wires 91 extending from the spreader of the floating crane 90 may be connected to the lugs 170 which may be located in the first to third frames 130,

The manufacturing process related to the upper leg 51 can be performed on the base frame 120 of the mounting jig 100. [

At this time, the lower end of the upper leg 51 may protrude outward from the first frame 130 of the mounting jig 100.

Thereafter, the worker can fix the upper leg 51 and the mounting jig 100 to each other using the securing device 110.

4, in the step of horizontally installing the mounting jig 100 on which the upper leg 51 to be connected to the lower leg 52 is mounted in the vicinity of the leg well 40, the floating cranes 90 are used .

5 shows the step of installing the guide jig 300 on the inner side of the leg well 40 of the main body 30. As shown in Fig.

The guide jig 300 refers to a bar-shaped jig frame, and unshown attachment / detachment means (e.g., flange and bolt) is coupled to a bolt hole (not shown) provided on the inner surface of the leg well 40 Therefore, it can be fixed to the inner surface of the leg well 40.

The guide jig 300 is rotatably coupled to the jig 300 along the jig frame 300 so as to engage with the rack gear 121 provided at the bottom end of the base frame 120 of the mounting jig 100. [ A plurality of pinion gears 310 may be provided. Each pinion gear 310 may be coupled to the gear groove of the guide jig 300 through a rotary shaft and a support.

That is, the guide jig 300 has a plurality of pinion gears 40 rotatably arranged along the vertical direction of the inner side surface of the leg well 40 to be engaged with the rack gear 121 of the mounting jig 100, And can take a role of guiding the lowering of the mounting jig 100. The lowering of the mounting jig 100 is guided to have the same meaning as the lowering of the upper leg 51 mounted on the mounting jig 100 is guided.

6, when the floating crane 90 around the main body 30 vertically stands up the upper leg 51 and the mounting jig 100, the floating crane 90 is moved to the anchor And a mooring cable (not shown). In this state, the floating crane 90 rotates the boom, and the rotational force of the floating crane 90 can be a force for raising the mounting jig 100 with respect to the pivot 200.

The pivot jig 220 corresponding to the pivot 200 on the side of the mounting jig 100 and the recess 221 of the pivot jig receiving portion 210 corresponding to the pivot 200 on the side of the main body 300 Shaped mounting holes 211 become the center of rotation so that the entire upper leg 51 and the mounting jig 100 are rotated with respect to the center of rotation thereof.

In addition, the floating crane 90 stabilizes the lifting state of the upper leg 51 and the mounting jig 100 through load balancing.

2 and 7, after the upper leg 51 and the mounting jig 100 are vertically erected, the pivot jig seating portion 210 is moved from the edge of the leg well 40 of the main body 30 Step S145 may be further performed. In addition, the pivot jig 220 is also separated from the mounting jig 100.

Referring to Fig. 8, the floating crane 90 moves the upper leg 51 and the mounting jig 100 downward.

The guide jig 300 includes a plurality of pinion gears 310 that are rotatably arranged along the vertical direction of the inner surface of the leg wells 40. The rack gears 310 are rotatably supported by the rack gears 300, (121) so as to guide the lowering of the mounting jig (100) and the upper leg (51).

9, in the step of connecting the lower end of the upper leg 51 and the upper end contact portion 59 of the lower leg 52 to each other, welding or general bolt and nut connection can be made.

That is, in the step of connecting the lower end of the upper leg 51 and the upper end of the lower leg 52 to each other, they are fixed by welding or by using a flange, a bolt and a nut Can be achieved.

9 and 10, the step of dismounting the mounting jig 100 and the guide jig 300 may include dismounting the securing device 110 to allow the mounting jig 100 and the leg 50 They can be separated from each other. The mounting jig 100 can be separated and disassembled from the leg 50 and the guide jig 300 can also be disassembled from the main body 30 with the help of a jib crane .

Then, in the space between the inner side of the leg well 40 and the leg 50 and around it, general device components used in a jack-up drilling rig, such as a pinion gear and a gear drive as a jack-up unit, can be mounted. At this time, the pinion gear of the gear drive device of the jack-up unit can be engaged with the rack gear provided in the cord of the leg 50. [

In addition, as described above, the remaining legs (not shown) are mounted on the main body 30 in the same manner, whereby the leg mounting of the present embodiment can be completed.

The pinion gear of the jack-up unit is rotated so that the legs 50 engaged with the pinion gear of the jack-up unit are rotated by the power supplied to the gear-driving unit of the jack-up unit of the main body 30 of the floating structure, So that the legs 50 including all the sped cans can be moved upward. Here, when the spud can is close to the bottom surface of the main body 30, the operation of the jack-up unit is stopped, and the stopper device (not shown) previously provided in the jack-up unit is operated to keep the stop state.

The main body 30 and the legs 50 can then be launched into the sea by a conventional skid-style hull launching system or floating-type launching system using a floating crane. At sea, the legs 50 are again driven by the operation of the jack- The legs 50 and the sprung can can be moved to the underside and a normal finishing work on the main body 30 can be made.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. For example, a person skilled in the art can change the material, size and the like of each constituent element depending on the application field or can combine or substitute the embodiments in a form not clearly disclosed in the embodiments of the present invention, Of the range. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and that such modified embodiments are included in the technical idea described in the claims of the present invention.

30: main body 40: leg well
50: leg 51: upper leg
52: lower leg 53: sprung can
100: mounting jig 110: securing device
120: base frame 121: rack gear
130: first frame 140: second frame
150: third frame 200: pivot
210: pivot jig mounting part 220: pivot jig
300: guide jig 310: pinion gear

Claims (5)

Disposing the lower leg under the leg well of the body;
Installing a mounting jig having an upper leg to be connected to the lower leg horizontally around the leg well;
Installing a guide jig on an inner surface of a leg well of the main body;
Wherein a crane around the body stands upright the upper leg and the mounting jig;
Separating the pivot jig from the mounting jig;
Lowering the upper leg and the mounting jig by the crane;
Connecting the lower end of the upper leg and the upper end of the lower leg to each other; And
And disassembling the mounting jig and the guide jig. The method according to claim 1,
Wherein the step of connecting the lower end of the upper leg to the upper end of the lower leg is performed by welding or by a flange, a bolt and a nut. Way. The method according to claim 1,
Wherein the guide jig guides a descent of the mounting jig by engaging a plurality of pinion gears rotatably arranged along a vertical direction of an inner side surface of the leg well with a rack gear of the mounting jig How to load legs. The method according to claim 1,
Further comprising the step of installing the pivot jig seat on the rim of the leg well after the step of disposing the lower leg on the bottom of the leg well of the body. The method according to claim 1,
Further comprising the step of separating the pivot jig seating from the rim of the leg well after the step of erecting the upper leg and the mounting jig vertically.

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