KR100718928B1 - Giga-block method using many sea-cranes - Google Patents

Abstract

The present invention provides a gigablock method using a plurality of offshore cranes to build a ship by transporting and mounting a gigablock (Giga-Block) manufactured on land using a plurality of offshore cranes into the dock.

The gigablock method using a plurality of marine cranes according to the present invention comprises the steps of manufacturing a hull block in gigablock on land; Connecting a plurality of marine cranes so that they can be synchronized with each other; Lifting the gigablock to the sea with the plurality of sea cranes; Seating the gigablock in place on the floating dock; Combining the gigablocks to build a vessel.

According to the present invention, the ship can be quickly dried by the gigablock, the turnover rate of the dock can be increased, and the productivity of the ship can be improved.

Offshore Crane, Giga-Block Method, Rope, Fender

Description

Giga-Block Method using many Sea-Cranes

1 is a conceptual diagram illustrating ship construction in a dock according to the prior art.

Figure 2 is a side view showing a marine crane according to the prior art.

3A is a flowchart showing a first embodiment of a gigablock method using a plurality of marine cranes according to the present invention.

3B is a flowchart illustrating a second embodiment of a gigablock method using a plurality of marine cranes according to the present invention.

4 is a perspective view showing a first working form of the step of lifting a gigablock in the first and second embodiments shown in FIGS. 3A and 3B.

FIG. 5 is a plan view showing a second working form of the step of lifting a gigablock in the first and second embodiments shown in FIGS. 3A and 3B.

FIG. 6 is a side view showing a third working form of the step of lifting a gigablock in the first and second embodiments shown in FIGS. 3A and 3B.

7 is a plan view showing a fourth working form of the step of lifting the gigablock in the first and second embodiments shown in FIGS. 3A and 3B.

<Description of the symbols for the main parts of the drawings>

100: offshore crane 102: offshore crane

104: Boom 106: Wire

108: Shackle 110: Rope

112: Fender 150: Floating Dock

152: fetish 200: gigablock

The present invention relates to a method for constructing a ship, and more specifically, to produce the four to five gigablocks constituting the ship in advance in advance, and lifted it using a plurality of offshore cranes, the plurality of offshore cranes By providing the gigablock directly to the inside of the dock, or by floating the gigablock in the sea with a plurality of marine cranes to provide a gigablock method using a plurality of marine cranes to move the gigablock into the dock.

In general, the shipbuilding industry, which begins with the ordering of ships, is designed, built and delivered, determines the survival and success of the industry by the profitability of the business.

At this time, one of the important factors that determine the profitability is the productivity that occurs in the shipbuilding method, all shipbuilding industries are trying to improve the productivity of shipbuilding. As part of this effort, the block method has emerged.

In the block method, first, the hull is divided into dozens or hundreds of blocks, and the divided blocks are first assembled on the ground, and then the assembled blocks are sequentially mounted on a dock (dry dock, floating dock) or trousers to form a single block. It is the construction method to build a ship. First, the block is completed in the most efficient method in each factory according to its shape, and then the painting work on the completed block is performed. After that, the painting blocks are combined by several blocks, and thus the operation of combining the blocks into one is called a pre-rection (hereinafter, referred to as 'PE') operation.

As such, most shipyards are trying to increase dock turnover by making many blocks required for ships into large blocks through PE work first and then transporting them into the dock to build the ship.

On the other hand, the dock (Dock) is a facility built in a shipyard or a port for repairing and building ships, largely divided into dry dock (floating dock) and floating dock (floating dock). First, a dry dock is a land structure for ship construction, and is a workshop that can open and close a dock gate that is docked at sea, fill water in the dock, or drain water from the inside of the dock. On the other hand, the floating dock is a marine structure including a ballast tank (Ballast Tank) inside the dock, when the water is injected into the ballast tank, the floating dock is submerged in water, water from the inside of the ballast tank When discharged, the floating dock has a form that floats to the sea.

The concept of ship construction in a dock according to the prior art is shown in Fig. 1, the dry dock (1) is a large "-" shape so that a plurality of ships can be produced, on land in contact with the sea It is in the form of a groove. In addition, the dry dock 1 is provided with a water gate that can be opened and closed at the eye portion with the sea, which is referred to as the dock gate (2). The dry dock 1 is provided with a goliath crane 4, and a trolley 5 that can move from side to side is installed in a girder of the goliath crane 4. In addition, the lower part of the trolley 5 includes a sackle that can fix the movable body 6 and a wire and a pulley that can lift the movable body 6.

Blocks fabricated in the PE workshop are transported to the dry dock 1 by various land vehicles, for example, transporters. Thereafter, the transported blocks are mounted into the dry dock 1 by various cranes disposed around the dry dock 1, for example, a jib crane or a goliath crane. The mounted blocks are dried in one ship by welding or the like inside the dry dock 1. After the ship is constructed in this way, the ship must be launched to sea. First, when the dock gate 2 of the dry dock 1 is opened and the drinking water is introduced, the ship is launched at sea.

However, since the ship construction in the dock according to the prior art used a land transportation means having a loading load of less than 1000 tons for transport of the block, only the unit block method for building a vessel using blocks of approximately 700 to 1000 tons This could be applied.

However, this unit block method has no advantages compared to the existing method in terms of using a block manufactured in advance on land, but the rotation rate of the dock could not be greatly increased in that large blocks cannot be used. As a result, in order to produce more ships, additional land docks have to be manufactured, which costs about 60 billion won for the construction of one land dock with a length of approximately 300 m.

Thus, there is a need for a large block construction that can build more ships more quickly without incurring additional costs.

The emergence of this demand is the Mega-Block process.

The megablock method is a method of dividing the ship into approximately 12 blocks in advance on the land, carrying it on a dock, and mounting it, and combining them to complete the ship. At this time, the block used in the megablock method is called a megablock, the megablock has a weight of about 1000 ~ 3200 tons, and has a length of about 30m.

However, the megablock could not be transported into the dock by most land vehicles because of its heavy weight. It was the marine crane that appeared.

In general, the marine crane is used to install large structures such as harbors, sea piers, etc., and is used for lifting or moving steel structures having a weight (approximately 3000 tons) of mega blocks in the marine workshop. It became. However, such a work is not frequent, so it is often left unattended when the sea crane is not used.

Figure 2 is a side view showing a marine crane according to the prior art. As shown in FIG. 2, the marine crane 10 may lift the main body 12, the boom 14 extending upward from the front of the main body 12, and the moving object. When the wire 16 is used, and the moving object and the shackle (18) for fixing the wire (16) is included.

In this case, a method of lifting the moving object using the marine crane 10 is described. The moving part is hooked to the circle 18 and the wire 16 connected to the circle 18 is wound up. The moving object is then lifted above the boom 14. Thereafter, the marine crane 10 which lifts the moving object moves to a place 20 (shown as a floating dock in FIG. 2) on which the moving object is to be placed. The marine crane 10, which has reached the place 20 on which the moving object is to be seated, first releases the moving object by releasing the wire 16, and then disassembles the sackle 18 connected to the moving object.

The use of such marine cranes made it possible to build a ship using the megablock method.

The present invention has been made to overcome the disadvantages of the prior art as described above, a plurality of gigablocks pre-fabricated in the land can be transported into the dock using a plurality of marine cranes to increase the productivity of the ship It is a technical task to provide a gigablock method using alternative marine cranes.

The concept of block construction, which can build more ships more quickly than the megablock construction, has emerged. This is called the giga-block construction. The gigablock method is a method of dividing the ship into about 4 to 5 blocks in advance in the land, and transporting and loading it into the dock by using the sea crane, and combining them to complete the ship. In this case, a block used in the gigablock method is called a gigablock, and the gigablock has a weight of about 4000 tons or more, and the rated load of the marine crane is about 3000 to 3600 tons, so-called gigablocks exceeding this. There have been many difficulties in introducing the gigablock method used, and the rotation rate of the dock is still not greatly improved.

 In order to achieve the above technical problem, the gigablock method using a plurality of offshore crane according to the present invention comprises the steps of manufacturing the hull block in gigablock on land; Connecting a plurality of marine cranes so that they can be synchronized with each other; Lifting the gigablock to the sea with the plurality of sea cranes; Moving the plurality of marine cranes; Seating the gigablock in position within the dock with the plurality of marine cranes; Dismantling the plurality of offshore cranes and the gigablocks; And it provides a gigablock method using a plurality of offshore crane comprising the step of building a vessel by combining the gigablock.

In addition, the present invention comprises the steps of manufacturing a hull block in gigablock on land; Connecting a plurality of marine cranes so that they can be synchronized with each other; Lifting the gigablock to the sea with the plurality of sea cranes; Seating the gigablock in place on the floating dock; And it provides a gigablock method using a plurality of offshore crane comprising the step of building a vessel by combining the gigablock.

At this time, it is preferable to use a plurality of offshore cranes, wherein the towing of the gigablock to the correct position is performed by a plurality of towing ships. This is because the gigablock floating on the sea by a plurality of marine cranes can not move to the inside of the dock by itself, it is connected to a plurality of tugboat by a rope to move the gigablock to the inside of the dock.

In addition, when the plurality of offshore cranes are connected, the upper sides of the main bodies facing each other are connected with a plurality of ropes, and a plurality of fenders are inserted into the lower parts of the ropes, so that collisions between the plurality of offshore cranes are connected. It is desirable not to generate it. This is to connect the plurality of marine cranes in order to synchronize the lifting and transport operation of the gigablock, the upper side of the main body facing each other by a plurality of ropes. At this time, when a plurality of marine cranes are connected in the same manner as above, an empty space is formed between the main bodies facing each other, and there is a risk of collision due to the relative movement between the main bodies facing each other in the space. To prevent this risk, a plurality of fenders are inserted in the lower part of the rope.

Before describing preferred embodiments of the present invention, first, briefly referring to the type of marine crane used in the present embodiments, a 3000 ton marine crane and a 3600 ton marine crane are used. However, as the types of marine cranes that can be used in the present embodiments can be used for all categories of marine cranes, it is also possible to use marine cranes of 7000 tons or more that can be manufactured later.

In addition, before describing the preferred embodiments of the present invention, to define the gigablocks used in the present embodiment, a hull spare block having a weight and a size corresponding to a plurality of megablocks and manufactured in advance on land to be. Usually the gigablock has a weight of about 4000 tons or more and a length of 50 m or more.

Hereinafter, a gigablock method using a plurality of marine cranes according to preferred embodiments of the present invention will be described in detail with reference to FIGS. 3A to 7.

First embodiment

3A is a flowchart showing a first embodiment of a gigablock method using a plurality of marine cranes according to the present invention.

As shown in Figure 3a, the first embodiment of the gigablock method using a plurality of offshore cranes according to the present invention, first, a step (S301) of manufacturing a hull block on the land as a gigablock. First, in the PE workshop on land, the hull is first divided into dozens or hundreds of blocks, and the blocks divided into several gigablocks are combined to produce four to five gigablocks constituting the hull. In this case, the gigablock refers to a block having a weight of about 4000 tons or more and having a length of 50 m or more.

Next, a step (S303) of connecting the plurality of marine cranes to be synchronized with each other. In this case, referring to FIG. 4 first to understand the connection of a plurality of offshore cranes, two offshore cranes 100 and 100 'are arranged side by side, and the main body of the two offshore cranes 100 and 100' 102, 102 'to connect the rope 110 to the upper portion of the side facing each other. At this time, the rope 110 is connected to each of the bow side, the center side, the stern side of the two main body (102, 102 '), in another embodiment the position and number of the rope 110 is connected to the marine crane It may be changed little by little depending on the size of the and gigablocks. In addition, a plurality of fenders 112 are additionally inserted in the lower portion of the rope 110 to prevent a collision between the two main bodies 102 and 102 '. In this case, the fender 112 is made of a rubber material, and is an elastic body capable of injecting air therein. In another embodiment, the fender 112 may be an elastic body formed entirely of rubber material. As described above, the above description is related to the connection of two marine cranes, but by repeatedly applying the same method, it is possible to understand the connection of multiple marine cranes.

Next, the step of lifting the gigablock to the sea by the plurality of marine cranes (S305).

In this case, the steps of lifting the gigablock with a plurality of marine cranes will be described in detail with reference to FIGS. 4, 5, 6, and 7.

4 is a perspective view showing a first working form of lifting a gigablock, FIG. 5 is a plan view showing a second working form of lifting a gigablock, and FIG. 6 is lifting a gigablock. It is a side view which shows the 3rd work form of the step of doing it, FIG. 7 is a top view which shows the 4th work form of the step of lifting a gigablock.

Referring to FIG. 4, the gigablock is lifted using the two marine cranes 100 and 100 'connected by the step S303 of connecting the plurality of marine cranes. At this time, each of the sackle (108, Shackle) provided in the two offshore cranes (100, 100 ') connected to the upper portion of the gigablock 200, each wire 106 connected to the sackle (108) Winding up, the gigablock 200 is lifted above the boom 104 of the two offshore cranes 100 and 100 '. At this time, the allowable load that can be lifted using two offshore cranes 100 and 100 'is approximately 85% of the sum of the allowable loads of the respective offshore cranes 100 and 100'. If 3000 tons of marine cranes and 3600 tons of marine cranes are connected and used, the allowable load of gigablocks they can lift is approximately 5610 tons.

Referring to FIG. 5, the second operation mode is lifted by using three marine cranes 100, 100 ′ and 100 ″ connected by connecting the plurality of marine cranes (S303). At this time, the three marine cranes (100, 100 ', 100 ") is connected to the rope 110 between the main body (102, 102', 102"), the lower portion of the rope 110 is connected A fender 112 is installed. The three marine cranes 100, 100 ', and 100 "are mounted on top of the gigablock 200, and wires (not shown) are connected to the sacks. ), The gigablock 200 is lifted above the booms 104, 104 ', 104 "of the three marine cranes 100, 100', 100". At this time, the allowable load that can be lifted using three marine cranes (100, 100 ', 100 ") is approximately 80% of the sum of the allowable loads of the respective marine cranes (100, 100', 100"). . If two 3000 ton marine cranes are connected to one 3600 ton marine crane, the gigablocks that they can lift are approximately 7680 tonnes.

Referring to FIG. 6, the third operation form, two marine cranes 100 and 100 ′ simultaneously lift the gigablock 200 from both sides of the gigablock 200. The two offshore cranes 100 and 100 'face each other and need to lift the gigablock 200, a form of work that cannot be used in dry docks on land, or floating docks 150 or A dock (not shown) protruding into the sea is a type of work that can be used. First, two marine cranes 100 and 100 ′ are disposed on the left and right sides of the gigablock 200, and the gigablock 200 is lifted using a sackle (not shown) and a wire 106. Subsequently, the two marine cranes 100 and 100 'are disposed at left and right sides thereof with the floating dock 150 interposed therebetween, and the wire 106 is released to lower the gigablock 200 to the floating dock 150. It rests on the inner wood 152. In this case, the gigablock 200 is lifted and mounted on both sides thereof without connecting the respective sea cranes 100 and 100 ', and the shaking of the gigablock 200 and each of the sea cranes 100 and 100, respectively. 100 ') is a type of work that requires a great deal of attention.

Referring to FIG. 7, the fourth operation form is connected to two marine cranes 100 and 100 ′, which are arranged to the right of the gigablock 200, and one marine crane 100 ″ is connected to the gigablock ( It is disposed on the left side of the 200, the lifting form of the gigablock 200 by using the three marine cranes, and is mounted on the floating dock 150. This type of operation is the first operation form described above and Since the third work type is combined, unnecessary redundant description will be omitted.

Next, the step (S307) of moving the plurality of marine cranes. This is to move the plurality of offshore cranes in order to move the gigablock to the right position after lifting the gigablock in the previous step.

Next, a step (S309) of seating the gigablock in the fixed position in the dock with the plurality of marine cranes. The plurality of marine cranes lifting the gigablock moves to the home position, after which the wires of the plurality of marine cranes are released to seat the gigablock in place. At this time, the gigablock may be seated in the dry dock of the land, may be inside the floating dock of the sea, or may be pants, the antagonist in place before the gigablock is seated Install first. This is because when the gigablock is seated, the gigablock may be damaged due to impact with the bottom of the dock.

Next, the step (S311) of disassembling the plurality of marine cranes and the gigablock. This refers to an operation of separating the sacks of the plurality of marine cranes mounted on the gigablock when lifting the gigablock.

Finally, the step of building the vessel by combining the gigablock (S313). Because of this, the four to five gigablocks seated in place are joined by a method such as welding, and completed in one ship.

Second embodiment

3b is a flowchart showing a second embodiment of the gigablock method using a plurality of marine cranes according to the present invention.

As shown in Figure 3b, the second embodiment of the gigablock method using a plurality of offshore cranes of the present invention, first, a step (S401) of manufacturing the hull block on the land as a gigablock. Since this step has already been described in the first embodiment, duplicate description thereof will be omitted.

Next, a step (S403) of connecting the plurality of marine cranes to be synchronized with each other. Since this step is also described in the first embodiment, duplicate description thereof will be omitted.

Next, the step of lifting the gigablock to the sea by the plurality of marine cranes (S405). Since this step is also described in the first embodiment, duplicate description thereof will be omitted.

Next, the step (S407) for seating the gigablock in place on the floating dock. At this time, the gigablocks lifted by a plurality of marine cranes are directly transported to the floating dock of the sea, after which the gigablocks can be seated in place on the floating dock.
Finally, the step of building the vessel by combining the gigablock (S411). This step is also the same as the description in the first embodiment, wherein four to five gigablocks seated in place are joined by a method such as welding, and completed in one ship.

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In the above, the gigablock method using a plurality of marine cranes has been described in the present invention. Such a technical configuration of the present invention will be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the following claims rather than the foregoing description, and the meanings of the claims and All changes or modifications derived from the scope and the equivalent concept should be construed as being included in the scope of the present invention.

As described above, according to the gigablock method using a plurality of marine cranes according to the present invention, by using a plurality of marine cranes connected to be synchronized with each other to lift the previously manufactured gigablock on the land, and dock By allowing the ship to be built by moving and mounting therein, the dock turnover rate is increased, the number of days of ship construction is greatly reduced, and the productivity of the ship is improved.

In addition, according to the gigablock method using a plurality of marine cranes according to the present invention it is possible to further reduce the time it takes to mount the block, significantly reducing the period of building the vessel inside the dock.

Claims (4)

delete Manufacturing a hull block in a land as a gigablock; Connecting a plurality of marine cranes so that they can be synchronized with each other; Lifting the gigablock to the sea with the plurality of sea cranes; Seating the gigablock in place on the floating dock; And Gigablock construction method using a plurality of offshore crane comprising the step of combining the gigablock to build a vessel. delete The method of claim 2, When the plurality of marine cranes are connected, the upper sides of the main body facing each other are connected by a plurality of ropes, and a plurality of fenders are inserted in the lower part of the ropes, so that collisions do not occur between the connected marine cranes. Gigablock method using a plurality of marine cranes characterized in that not to.

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