KR20160048279A - Method for mounting thruster in semi-submergible rig - Google Patents

Abstract

The present invention relates to a method for mounting a thruster in a semi-submersible rig, which enables the installation of a thruster in a rig in a minimum water depth. According to an embodiment of the present invention, the method for mounting a thruster in a semi-submersible rig enables the easy installation of a thruster as the thruster in a horizontal state is moved in a horizontal direction and then is installed in a thruster room. Moreover, the present invention enables the installation of the thruster even in a condition that the minimum water depth required for a work is 10% less than a conventional condition required for a work where the thruster in a vertical state is moved in a horizontal direction and is installed in the thruster room.

Description

[0001] The present invention relates to a method of mounting a semi-submergible rig in a semi-

The present invention relates to a semi-submerged leash line thruster mounting method capable of mounting a thruster to a league line at a minimum water depth.

Generally, a semi-submersible rig line is a propulsion thruster used for magnetic position control, which is assembled to a receptacle and motor in a thruster room after launching a semi-submersible rig line It is common.

In the semi-submerged league line, a thruster room is formed, and the upper structure of the thruster is mounted on the lower part of the thruster room. The upper structure of the thruster is provided with parts with low impact resistance such as hydraulic pipes, lubricating oil pipes, and steering gears. These parts may be damaged even if a slight impact is applied. Therefore, the thruster should be installed in the thruster room Special care must be taken when handling the stirrer.

If a thruster is installed using a crane on a barge, the thruster is suspended on the rope of the crane installed on the barge in the sea, and the hoisting rope connected to the rope installed in the upper part of the semi-submersible rig line through the rope connection After the thruster is hung, the thruster is taken in the water, and the winch on the semi-submersible rig line is operated to pull the lifting rope to place the thruster directly under the thruster room and then pull it up.

The lifting rope of the winch is installed so as to extend through the thruster room to the lower part thereof.

After connecting the rope of the crane of the barge to the upper part of the thruster, loosen the rope of the crane of the barge, and get the thruster in the water of semi-submersible rig line, The rope is released from the crane of the barge line and the lifting rope of the semi-submersible league line pulls the thruster from the other side of the upper part of the thruster room while winding the lifting rope in the winch of the semi-submersible league line, The load direction of the thruster's own weight and the pulling direction of the lifting rope do not form a straight line but are shifted from each other, so that it is difficult to center the thrusters.

If the center of gravity of the thruster is not caught when the thruster is pulled, the thruster is shaken. When the thruster is shaken, the components installed in the upper structure of the thruster are routed to the crane rope of the barge line and the lifting rope , It is necessary to pull the lifting rope of semi-submersible rigging line while holding the horizontal center of gravity of the thruster above the upper structure in order to prevent it from being damaged.

In order to pull the thrusters upward while keeping the center of gravity so that the upper structure is positioned at the upper side, it is necessary to be able to precisely adjust the upper and lower rails so as to pull up the thrusters. Due to the nature of the winch, there is a limit to precisely control the lifting rope up and down respectively.

Thus, conventionally, a method of pulling a thruster upward by using a lifting rope of a semi-submerged league line was used after getting the gustor in deep water of 50m or more in depth, but when the thruster was obtained in deep water of 50m or more in depth Since the angle between the thrusters and the thrusters is very small, the direction of the weight of the thrusters and the pulling direction of the lifting ropes are made almost straight, so that the center of gravity of the thrusters is relatively easy to pull, Parts installed in the upper structure of the thruster are reduced to some extent by being hit by the lifting rope of the drill ship.

However, this method also connects lifting ropes of winch. Due to the nature of the winch, there is a limitation in precisely adjusting the lifting ropes up and down, respectively. Therefore, keep the thrusters in the horizontal position There is a problem that can not be done.

In order to solve the above problems, Korean Patent Registration No. 10-0568613 (apparatus and method for installing a thruster of a drill ship, hereinafter referred to as Conventional 1) and Korean Patent No. 10-0967816 (Semi- A method of mounting a thruster on a wire, hereinafter referred to as Conventional 2), and Korean Patent No. 10-0978065 (a method of mounting a thruster on a drill string, hereinafter referred to as Conventional 3).

In the prior arts 1 and 3, the thrusters are seated on a separate platen, and then the semi-submersible leash line is moved in a state where the thrusters are placed in the sea so that the thrust rooms and the thrusters are disposed directly below There is a problem that it is very difficult to install because of the installation of the thruster, and the operation period and the cost are excessively required.

In the case of the prior art 2, since the thruster is required to be installed in the thruster room after the thruster is set up close to the vertical and then taken to the sea, it is necessary to secure a certain depth of water. When the stirrer is moved in the lateral direction, there is a fatal disadvantage that the bottom of the thruster is brought into contact with the seabed so that the thruster is damaged.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of mounting a thruster of a semi-submerged league line in which a thruster can be mounted on a league line at a minimum water depth.

According to an aspect of the present invention,

The strands of the first, the second and the third strand jacks which can be driven respectively on the upper plate of the league line are installed so as to pass through the bottom of the league line with the thruster room therebetween and the first, second and third lugs of the steering flange constituting the thruster With the lifting wire of the first, second, and third lifting wire assemblies installed, connect the lifting wire of the crane to the crane lug formed on the thruster, and the steering flange of the thruster should face the hull. And a thruster is received in the sea via a lifting wire in a state where the lifting wire is oriented in a direction in which the lifting wire is directed;

Connecting the strands to the inboard lifting wires of the first, second, and third lifting assemblies, respectively;

Moving the lifting wire assembly through the first, second and third strand jacks while releasing the lifting wire of the crane to move the thrusters in the lateral direction;

Winding the first lifting wire assembly through the first strand jack to raise the thruster when the thruster is disposed in the thruster room;

And winding the first and second lifting wire assemblies through a first, a second, and a third strand jack to mount the thruster to the thruster room.

According to another aspect of the present invention,

The strands of the first, the second and the third strand jacks which can be driven respectively on the upper plate of the league line are installed so as to pass through the bottom of the league line with the thruster room therebetween and the first, second and third lugs of the steering flange constituting the thruster With the lifting wire of the first, second, and third lifting wire assemblies installed, connect the lifting wire of the crane to the crane lug formed on the thruster, and the steering flange of the thruster should face the hull. And a thruster is received in the sea via a lifting wire in a state where the lifting wire is oriented in a direction in which the lifting wire is directed;

Connecting the strands to the respective lifting wires of the second and third lifting assemblies;

Lifting the lifting wire of the crane while simultaneously winding the second and third lifting wire assemblies through the second and third strand jacks to horizontally move the thrusters;

Connecting the strand to the inboard lifting wire of the first lifting assembly and then winding the first lifting wire assembly through a first strand jack to vertically raise the thruster;

And lifting the lifting wire of the crane while winding the first and second lifting wire assemblies through the first and second and third strand jacks to mount the thruster to the thruster room. do.

The method may further include the step of installing a protective cover on the wall surface of the hull so as to prevent rubbing by the lifting wire.

Further, the present invention is further characterized in that a rotating ring is interposed between the lifting wire and the strand so as to be rotatable about a vertical axis.

Here,

A first rotating body rotatably installed via a first pin fitted to the lifting wire;

And a second rotating body rotatably installed via a second pin having one side inserted into the strand, the other side of which is provided on the first rotating body and is pivoted about the first rotating body.

According to this embodiment, since the thruster is moved in the horizontal direction in the horizontal posture and then mounted in the thruster room, it is easy to install, and in particular, in the vertical posture (prior art) Since the turning radius is smaller than that of the mounting, it is possible to mount the apparatus even under the condition that the minimum water depth required for the operation is 10% or less.

In addition, by installing a swivel ring between the inboard lifting wire and the strands that make up the first, second, and third lifting wire assemblies, move the thruster laterally or move the first, second, and third lifting wire assemblies from the thruster It is quite useful since it can fundamentally eliminate the problem of twisting the first, second, and third lifting wire assemblies during disconnection.

1 is a schematic front view of a semi-submersible rig line according to the present invention;
2 and 3 are a front view and a plan view of a thruster of a semi-submersible rig line according to the present invention.
4 is a front view of the first, second, and third lifting wire assemblies in a semi-submersible rig line according to the present invention.
FIGS. 5A to 5H are views sequentially illustrating a thruster mounting process of a semi-submerged league line according to a first embodiment of the present invention; FIG.
6A to 6H are views showing a process of installing a thruster of a semi-submerged league line according to a second embodiment of the present invention in order;

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

1 is a schematic front view of a semi-submersible rig line according to the present invention.

1, there is a thruster room 11 opened downward so that the thruster 30 can be vertically inserted into the lower part of the semi-submerged league line 1, The first and second three-strand jacks 50a, 50b and 50c are installed inside the thruster room 11, and the first, second and third strand jacks 50a, 50b and 50c And a guide pipe 13 through which the first, second, and third lifting wire assemblies 40a, 40b, 40c are inserted.

The protection cover 20 is preferably made of a cloth material and has a lifting wire W lifted and lowered vertically. The protection cover 20 is provided on the wall surface 14 of the semi-submergible league line 1, The protective cover 20 is used for preventing the paint painted on the wall surface 14 from being damaged (peeled off) by the protective cover 20. Various known members can be applied to the protective cover 20 if necessary.

The first, second, and third strand jacks 50a, 50b, and 50c are a type of hydraulic jack that can be precisely driven and widely used in the field of machinery. Therefore, a detailed description thereof will be omitted. Respectively.

2 and 3 are a front view and a plan view of a thruster of a semi-submerged league line according to the present invention.

2 and 3, the thruster 30 is a propelling device used for controlling the magnetic position of the semi-submerged league line 1. The thruster 30 includes a body 31 having a crane lug 31a on its outer surface, A propeller 32 installed on the body 31 and disposed on the opposite side of the lug 31a for the crane 31, a propeller cover 34 for covering the periphery of the propeller 32 to protect the propeller 32, And the steering flange 33 is rotatably supported by the locking pin P so that the steering flange 33 can be rotated by the locking pin P. The first and second lugs 33a, 33b, Is limited.

Further, the steering flange 33 is integrally provided with a guide pin 35.

Here, the lifting wire (W) of the crane (C) is provided in the lug (31a) for the crane.

The second and third lugs 33b and 33c of the first, second and third lugs 33a, 33b and 33c formed on the steering flange 33 are provided on one side and the second and third lifting wire assemblies 40b, Lifting wire 41 of the first lifting wire assembly 40a and the first lifting wire 41a of the first lifting wire assembly 40a are fastened together with the fastening portion 41a provided at one end of the lifting wire 41 of the first lifting wire assembly 40a, 41 are fastened to each other by a fastening portion 41a.

4 is a front view showing a first, a second, and a third lifting wire assembly in a semi-submerged league line according to the present invention.

Referring to FIG. 4, the first and second lifting wire assemblies 40a, 40b, and 40c are formed of an embedded lifting wire 41 and a strand 42.

The lifting wire 41 constituting the first and second lifting wire assemblies 40a, 40b and 40c is connected to the first, second and third lugs 33a, 33b and 33c formed on the steering flange 33 Respectively, and the strands 42 are connected to the first, second, and third strand jacks 50a, 50b, and 50c, respectively.

A rotating ring 43 is provided between the inboard lifting wire 41 and the strand 42. The rotating ring 43 is composed of a first rotating body 43a and a second rotating body 43b The first rotating body 43a and the second rotating body 43b are rotatably connected to each other about a vertical axis.

The first rotating body 43a is rotatably connected to the lifting wire 41 via a first pin P1 and the second rotating body 43b is rotatably connected to the strand 42 through a second pin (P2).

Since the first rotating body 43a and the second rotating body 43b can be rotated in place around the vertical axis in the present embodiment, the problem of twisting the lifting wire 41 or the strand 42 is fundamentally Can be solved.

Lifting wire 41 fastened to the first, second, and third lugs 33a, 33b, and 33c of the steering flange 33, when the rotation ring 43 is not provided, Lifting wire 41 and strand 42 are twisted at the same time when disassembled.

However, in the case where the rotation ring 43 is provided, only the inboard lifting wire 41 can be rotated, and the problem of twisting the inboard lifting wire 41 and the strand 42 can be fundamentally eliminated It is quite useful.

On the other hand, the guide lifting wire 41 is provided with a guide member 44 made of Teflon.

The guide member 44 is inserted into the guide pipe 13 during the winding of the first and second lifting wire assemblies 40a, 40b and 40c by the first and second and third strand jacks 50a, 50b and 50c. The guide pipe 44 catches the guide pipe 44 to reduce the damage of the guide pipe 13 and the first and second lifting wire assemblies 40a and 40b 40c catch the shaking of the thruster 30 in the assembling of the receptacle (not shown) and the thruster 30 so that the guide pin 35 comes into contact with the receptacle (not shown) (Not shown) to be smoothly assembled with the lower hole.

FIGS. 5A to 5H are views sequentially illustrating a process of installing a thruster of a semi-submerged league line according to a first embodiment of the present invention.

The first and second and third lifting wire assemblies 40a and 40b are operated by operating first, second and third strand jacks 50a, 50b and 50c provided on the upper plate 12 of the league line 1, So that the strands 42 and the rotation hooks 43 of the guide lines 40a, 40b and 40c are passed through the guide pipe 13 to be exposed at the bottom of the rigid line 1.

2 and 3 lugs 33a, 33b and 33c of the steering flange 33 constituting the thruster 30 are provided with the thrusters 30, Lifting wire assemblies 40a, 40b and 40c of the lifting wire assemblies 1, 2 and 3, respectively.

The lifting wire W of the crane C is connected to the crane lug 31a formed in the body 31 of the thruster 30

At this time, the steering flange 33 of the thruster 30 is disposed so as to face the hull of the rigid line 1, and the propeller 32 is directed toward the sea bed B (more preferably, .

Particularly, it is preferable that the second and third lugs 33b and 33c of the steering flange 33 are located at the upper portion and the first lug 33a is located at the lower portion.

Then, the thruster 30 is lifted via the lifting wire W of the crane C.

As shown in FIG. 5B, the lifting wire W is lowered along the wall surface 14 of the rigid line 1, and the thruster 30 is received in the sea.

At this time, friction occurs between the wall surface 14 of the rigging line 1 and the lifting wire W, and thus there is a problem that the painted paint peels off the wall surface 14. In order to solve this problem, The protective cover 20 is provided on the wall surface 14 of the rig line 1 to minimize the problem of peeling off the paint.

Lifting wires 41 of the first and second lifting wire assemblies 40a, 40b and 40c provided on the steering flange 33 of the thruster 30 are provided with strands 42 The rotating ring 43 may be connected to the lifting wire 41. If the rotating ring 43 is provided in the strand 42,

The rotating ring 43 is coupled to the strand 42 so that the rotating ring 43 is connected to the lifting wire 41 via the first pin P1 .

The lifting wire W of the crane C is connected to the thrusters 30 while the first and second lifting wire assemblies 40a, 40b and 40c are connected to the thrusters 30, as shown in Figs. 5D and 5E. The third and the third lifting wire assemblies 40a, 40b and 40c are wound around the first and second and third strand jacks 50a, 50b and 50c while gradually releasing the thrusters 30, Moves in a lateral direction while drawing a certain radius of rotation.

However, interference between the thruster 30 and the first and second lifting wire assemblies 40a, 40b and 40c often occurs during the movement of the thruster 30. As a result, It is preferable to carefully move the thruster 30 because interference may occur between the first lifting wire assembly 40a and the thruster 30 to occasionally damage the upper structure of the thruster 30. [

The thruster 30 moves to the lower portion of the thruster room 11 and the thruster 30 reaching the lower portion of the thruster room 11 maintains a slight inclined state in the vertical state .

As shown in FIGS. 5F and 5G, the first lifting wire assembly 40a is wound around the first strand jack 50a so that the inclined thruster 30 is vertically erected.

When the thruster 30 is raised, the first and second lifting wire assemblies 40a, 40b and 40c are wound around the first and second and third strand jacks 50a, 50b and 50c, So that the thruster 30 can be disposed in the thruster room 11 by raising and lowering the thruster 30.

When the thruster 30 is disposed in the thruster room 11, the thruster 30 is fixed.

5H, after the thruster 30 is fixed to the thruster room 11, the first and second lifting wire assemblies 40a (40a) fixed to the steering flange 33 of the thruster 30 , 40b, and 40c.

The method of separating the first and second lifting wire assemblies 40a, 40b and 40c includes a step of forming a hole formed in the upper end of the lifting wire 41, The first rotating body 43a of the rotating ring 43 is rotated around the second rotating body 43b by rotating the driven lifting wire 41 in a state of inserting the steering wheel T, Lifting wire 41 can be separated from the lifting wire 33. [

Particularly, since the first rotating body 43a and the second rotating body 43b of the rotating ring 43 are mutually rotatable, even if the inboard lifting wire 41 is rotated, the first, second, and third lifting It is possible to solve the problem that the wire assemblies 40a, 40b and 40c are twisted, which is quite useful.

When the first and second lifting wire assemblies 40a, 40b, and 40c are separated from the steering flange 33, the first and second and third strand jacks 50a, 50b, It can be withdrawn.

Further, the lifting wire (W) of the crane (C) is separated from the crane lug (31a) of the thruster (30).

The separation time of the lifting wire W may be performed after fixing the thruster 30 to the thruster room 11 or may be performed at a lower portion of the thruster room 11 as shown in FIG. Or after the thruster 30 is disposed.

The difference between the first embodiment described above and the second embodiment described below is at the time of installing the first and second lifting wire assemblies 40a, 40b, and 40c.

More specifically, in the case of the first embodiment, the thruster 30 is moved in the lateral direction while the first and second lifting wire assemblies 40a, 40b, and 40c are all connected to the thruster 30 I will.

In contrast, in the second embodiment, the second and third lifting wire assemblies 40b and 40c are installed in the thruster 30 first, and when the thruster 30 is moved to some extent in the lateral direction, The assembly 40a minimizes interference between the thruster 30 and the first lifting wire assembly 40a to prevent damage to the thruster 30. [

Therefore, in the following description, a common part (the thruster 30 input and the first and second lifting wire assemblies 40a, 40b, and 40c) are connected to each other using the first, second, and third strand jacks 50a, 50b, and 50c And the thruster 30 disposed at the lower portion of the thruster room 11 is raised and lowered to be installed in the thruster room 11. After completion of the installation, 3 lifting wire assemblies 40a, 40b, and 40c from the thruster 30) will be omitted and the differences will be described in detail with reference to the drawings.

FIGS. 6A to 6D are views sequentially showing a process of installing a thruster of a semi-submerged league line according to a second embodiment of the present invention.

The strands 42 are connected to the inboard lifting wires 41 of the second and third lifting wire assemblies 40b and 40c provided on the steering flange 33 of the thruster 30 as shown in Fig. If the strands 42 are provided with the rotating ring 43, the rotating ring 43 may be connected to the lifting wire 41.

The rotating ring 43 is coupled to the strand 42 so that the rotating ring 43 is connected to the lifting wire 41 via the first pin P1 .

6B, while the second and third lifting wire assemblies 40b and 40c are connected to the thruster 30, the lifting wire W of the crane C is gradually released, When the lifting wire assemblies 40b and 40c are wound by way of the second and third strand jacks 50b and 50c, the thrusters 30 are moved in the lateral direction while drawing a constant radius of rotation.

The thruster 30 moves to the lower portion of the thruster room 11 and the thruster 30 reaching the lower portion of the thruster room 11 maintains a slight inclined state in the vertical state .

The strands 42 are connected to the inboard lifting wire 41 of the first lifting wire assembly 40a provided on the steering flange 33 of the thruster 30 as shown in Figs. 6C and 6D The rotating ring 43 is coupled to the strand 42 so that the rotating ring 43 is connected to the lifting wire 41 of the first lifting wire assembly 40a by the first pin P1. See Fig. 4).

Then, the first lifting wire assembly 40a is wound around the first strand jack 50a to vertically tilt the thruster 30, and the process thereafter is replaced with the first embodiment .

Therefore, according to the present embodiment, the second and third lifting wire assemblies 40b and 40c are installed in the thruster 30 first. When the thruster 30 is moved to a certain extent in the lateral direction, The wire assembly 40a minimizes the interference between the thrusters 30 and the first lifting wire assembly 40a to prevent damage to the thrusters 30. This is a very useful working method.

According to the present embodiment, since the thruster 30 is arranged in the horizontal posture and laterally moved in the horizontal posture, the thruster 30 is mounted in the thruster room 11, There is an advantage that it is possible to mount even in a condition that the minimum water depth required for the operation is 10% or less than that in the thruster room 11 after it is moved.

The thrusters 30 may be provided by providing a rotation ring 43 between the strands 42 and the lifting wires 41 constituting the first and second lifting wire assemblies 40a, 2, 3 lifting wire assemblies 40a, 40b, 40c are twisted when the first and second lifting wire assemblies 40a, 40b, 40c are separated from the thrusters 30, It is quite useful because it can fundamentally solve the problem.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

1: semi-submerged league line 11: thruster room 12: top plate
13: guide pipe 14: wall surface 20: protective cover
30: Thruster 31: Body 31a: Crane lug
32: propeller 33: steering flange 35: guide pin
33a, 33b, 33c: first, second, and third lugs 34: propeller cover
40a, 40b, 40c: first, second, and third lifting wire assemblies
41: Invaded lifting wire 42: Strand 43: Swivel ring
43a: first rotating member 43b: second rotating member 44: guide member
50a, 50b, 50c: first, second, and third strand jacks
T: Tool for turning C: Crane W: Lifting wire

Claims (5)

The strands of the first, the second and the third strand jacks which can be driven respectively on the upper plate of the league line are installed so as to pass through the bottom of the league line with the thruster room therebetween and the first, second and third lugs of the steering flange constituting the thruster With the lifting wire of the first, second, and third lifting wire assemblies installed, connect the lifting wire of the crane to the crane lug formed on the thruster, and the steering flange of the thruster should face the hull. And a thruster is received in the sea via a lifting wire in a state where the lifting wire is oriented in a direction in which the lifting wire is directed;
Connecting the strands to the inboard lifting wires of the first, second, and third lifting assemblies, respectively;
Moving the lifting wire assembly through the first, second and third strand jacks while releasing the lifting wire of the crane to move the thrusters in the lateral direction;
Winding the first lifting wire assembly through the first strand jack to raise the thruster when the thruster is disposed in the thruster room;
And winding the first and second lifting wire assemblies through a first, a second, and a third strand jack to mount the thruster to the thruster room. Way.
The strands of the first, the second and the third strand jacks which can be driven respectively on the upper plate of the league line are installed so as to pass through the bottom of the league line with the thruster room therebetween and the first, second and third lugs of the steering flange constituting the thruster With the lifting wire of the first, second, and third lifting wire assemblies installed, connect the lifting wire of the crane to the crane lug formed on the thruster, and the steering flange of the thruster should face the hull. And a thruster is received in the sea via a lifting wire in a state where the lifting wire is oriented in a direction in which the lifting wire is directed;
Connecting the strands to the respective lifting wires of the second and third lifting assemblies;
Lifting the lifting wire of the crane while simultaneously winding the second and third lifting wire assemblies through the second and third strand jacks to horizontally move the thrusters;
Connecting the strand to the inboard lifting wire of the first lifting assembly and then winding the first lifting wire assembly through a first strand jack to vertically raise the thruster;
And lifting the lifting wire of the crane while winding the first and second lifting wire assemblies through the first and second and third strand jacks to mount the thruster to the thruster room. A method of mounting a thruster of a semi-submerged league line.
3. The method according to claim 1 or 2,
Further comprising the step of installing a protective cover on the wall surface of the hull so as to prevent sweeping by the lifting wire.
3. The method according to claim 1 or 2,
Further comprising the step of installing a rotation ring between the inboard lifting wire and the strand so as to be rotatable about a vertical axis respectively.
5. The method of claim 4,
The rotation ring
A first rotating body rotatably installed via a first pin fitted to the lifting wire;
And a second rotating body rotatably mounted via a second pin having one side inserted into the strand, the other side being provided on the first rotating body and being pivotally rotated about the first rotating body. A method of mounting a thruster of a type of league line.

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